]>
Commit | Line | Data |
---|---|---|
b0fc3e72 | 1 | /* Subroutines shared by all languages that are variants of C. |
d513ec2f | 2 | Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
a8349c62 | 3 | 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
b0fc3e72 | 4 | |
f12b58b3 | 5 | This file is part of GCC. |
b0fc3e72 | 6 | |
f12b58b3 | 7 | GCC is free software; you can redistribute it and/or modify it under |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
b0fc3e72 | 11 | |
f12b58b3 | 12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
b0fc3e72 | 16 | |
17 | You should have received a copy of the GNU General Public License | |
f12b58b3 | 18 | along with GCC; see the file COPYING. If not, write to the Free |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
b0fc3e72 | 21 | |
22 | #include "config.h" | |
405711de | 23 | #include "system.h" |
805e22b2 | 24 | #include "coretypes.h" |
25 | #include "tm.h" | |
e48d0f41 | 26 | #include "intl.h" |
b0fc3e72 | 27 | #include "tree.h" |
b0fc3e72 | 28 | #include "flags.h" |
cd03a192 | 29 | #include "output.h" |
a3fa7feb | 30 | #include "c-pragma.h" |
a5b1863e | 31 | #include "rtl.h" |
dc12af01 | 32 | #include "ggc.h" |
573aba85 | 33 | #include "varray.h" |
74647769 | 34 | #include "expr.h" |
e41f0d80 | 35 | #include "c-common.h" |
cdc9fa3e | 36 | #include "diagnostic.h" |
d8c9779c | 37 | #include "tm_p.h" |
4e91a871 | 38 | #include "obstack.h" |
a654e028 | 39 | #include "cpplib.h" |
8ee295a7 | 40 | #include "target.h" |
96554925 | 41 | #include "langhooks.h" |
f3dde807 | 42 | #include "tree-inline.h" |
7acb29a3 | 43 | #include "c-tree.h" |
69579044 | 44 | #include "toplev.h" |
4ee9c684 | 45 | #include "tree-iterator.h" |
46 | #include "hashtab.h" | |
b55af61c | 47 | #include "tree-mudflap.h" |
e08bd2f4 | 48 | #include "opts.h" |
fd6f6435 | 49 | |
90cc7820 | 50 | cpp_reader *parse_in; /* Declared in c-pragma.h. */ |
a654e028 | 51 | |
174fcc61 | 52 | /* We let tm.h override the types used here, to handle trivial differences |
53 | such as the choice of unsigned int or long unsigned int for size_t. | |
54 | When machines start needing nontrivial differences in the size type, | |
55 | it would be best to do something here to figure out automatically | |
56 | from other information what type to use. */ | |
57 | ||
58 | #ifndef SIZE_TYPE | |
59 | #define SIZE_TYPE "long unsigned int" | |
60 | #endif | |
61 | ||
73673831 | 62 | #ifndef PID_TYPE |
63 | #define PID_TYPE "int" | |
64 | #endif | |
65 | ||
174fcc61 | 66 | #ifndef WCHAR_TYPE |
67 | #define WCHAR_TYPE "int" | |
68 | #endif | |
69 | ||
18ef7ac2 | 70 | /* WCHAR_TYPE gets overridden by -fshort-wchar. */ |
71 | #define MODIFIED_WCHAR_TYPE \ | |
72 | (flag_short_wchar ? "short unsigned int" : WCHAR_TYPE) | |
73 | ||
194c4d9f | 74 | #ifndef PTRDIFF_TYPE |
75 | #define PTRDIFF_TYPE "long int" | |
76 | #endif | |
77 | ||
6bf5ed8d | 78 | #ifndef WINT_TYPE |
79 | #define WINT_TYPE "unsigned int" | |
80 | #endif | |
81 | ||
82 | #ifndef INTMAX_TYPE | |
83 | #define INTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
84 | ? "int" \ | |
85 | : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
86 | ? "long int" \ | |
87 | : "long long int")) | |
88 | #endif | |
89 | ||
90 | #ifndef UINTMAX_TYPE | |
91 | #define UINTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
92 | ? "unsigned int" \ | |
93 | : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \ | |
94 | ? "long unsigned int" \ | |
95 | : "long long unsigned int")) | |
96 | #endif | |
97 | ||
72040e7e | 98 | /* The following symbols are subsumed in the c_global_trees array, and |
44e9fa65 | 99 | listed here individually for documentation purposes. |
72040e7e | 100 | |
101 | INTEGER_TYPE and REAL_TYPE nodes for the standard data types. | |
102 | ||
103 | tree short_integer_type_node; | |
104 | tree long_integer_type_node; | |
105 | tree long_long_integer_type_node; | |
106 | ||
107 | tree short_unsigned_type_node; | |
108 | tree long_unsigned_type_node; | |
109 | tree long_long_unsigned_type_node; | |
110 | ||
3c2239cf | 111 | tree truthvalue_type_node; |
112 | tree truthvalue_false_node; | |
113 | tree truthvalue_true_node; | |
72040e7e | 114 | |
115 | tree ptrdiff_type_node; | |
116 | ||
117 | tree unsigned_char_type_node; | |
118 | tree signed_char_type_node; | |
119 | tree wchar_type_node; | |
120 | tree signed_wchar_type_node; | |
121 | tree unsigned_wchar_type_node; | |
122 | ||
123 | tree float_type_node; | |
124 | tree double_type_node; | |
125 | tree long_double_type_node; | |
126 | ||
127 | tree complex_integer_type_node; | |
128 | tree complex_float_type_node; | |
129 | tree complex_double_type_node; | |
130 | tree complex_long_double_type_node; | |
131 | ||
132 | tree intQI_type_node; | |
133 | tree intHI_type_node; | |
134 | tree intSI_type_node; | |
135 | tree intDI_type_node; | |
136 | tree intTI_type_node; | |
137 | ||
138 | tree unsigned_intQI_type_node; | |
139 | tree unsigned_intHI_type_node; | |
140 | tree unsigned_intSI_type_node; | |
141 | tree unsigned_intDI_type_node; | |
142 | tree unsigned_intTI_type_node; | |
143 | ||
144 | tree widest_integer_literal_type_node; | |
145 | tree widest_unsigned_literal_type_node; | |
146 | ||
147 | Nodes for types `void *' and `const void *'. | |
148 | ||
149 | tree ptr_type_node, const_ptr_type_node; | |
150 | ||
151 | Nodes for types `char *' and `const char *'. | |
152 | ||
153 | tree string_type_node, const_string_type_node; | |
154 | ||
155 | Type `char[SOMENUMBER]'. | |
156 | Used when an array of char is needed and the size is irrelevant. | |
157 | ||
158 | tree char_array_type_node; | |
159 | ||
160 | Type `int[SOMENUMBER]' or something like it. | |
161 | Used when an array of int needed and the size is irrelevant. | |
162 | ||
163 | tree int_array_type_node; | |
164 | ||
165 | Type `wchar_t[SOMENUMBER]' or something like it. | |
166 | Used when a wide string literal is created. | |
167 | ||
168 | tree wchar_array_type_node; | |
169 | ||
170 | Type `int ()' -- used for implicit declaration of functions. | |
171 | ||
172 | tree default_function_type; | |
173 | ||
72040e7e | 174 | A VOID_TYPE node, packaged in a TREE_LIST. |
175 | ||
176 | tree void_list_node; | |
177 | ||
734c98be | 178 | The lazily created VAR_DECLs for __FUNCTION__, __PRETTY_FUNCTION__, |
65b7f83f | 179 | and __func__. (C doesn't generate __FUNCTION__ and__PRETTY_FUNCTION__ |
180 | VAR_DECLS, but C++ does.) | |
71d9fc9b | 181 | |
65b7f83f | 182 | tree function_name_decl_node; |
734c98be | 183 | tree pretty_function_name_decl_node; |
65b7f83f | 184 | tree c99_function_name_decl_node; |
185 | ||
186 | Stack of nested function name VAR_DECLs. | |
1cae46be | 187 | |
65b7f83f | 188 | tree saved_function_name_decls; |
71d9fc9b | 189 | |
72040e7e | 190 | */ |
191 | ||
192 | tree c_global_trees[CTI_MAX]; | |
ceee5ef4 | 193 | |
bac62436 | 194 | /* TRUE if a code represents a statement. The front end init |
195 | langhook should take care of initialization of this array. */ | |
196 | ||
197 | bool statement_code_p[MAX_TREE_CODES]; | |
573aba85 | 198 | \f |
574a6990 | 199 | /* Switches common to the C front ends. */ |
200 | ||
ffd56b21 | 201 | /* Nonzero if prepreprocessing only. */ |
f7070933 | 202 | |
ffd56b21 | 203 | int flag_preprocess_only; |
204 | ||
f7070933 | 205 | /* Nonzero means don't output line number information. */ |
206 | ||
207 | char flag_no_line_commands; | |
208 | ||
209 | /* Nonzero causes -E output not to be done, but directives such as | |
210 | #define that have side effects are still obeyed. */ | |
211 | ||
212 | char flag_no_output; | |
213 | ||
214 | /* Nonzero means dump macros in some fashion. */ | |
215 | ||
216 | char flag_dump_macros; | |
217 | ||
218 | /* Nonzero means pass #include lines through to the output. */ | |
219 | ||
220 | char flag_dump_includes; | |
221 | ||
d718b525 | 222 | /* Nonzero means process PCH files while preprocessing. */ |
223 | ||
224 | bool flag_pch_preprocess; | |
225 | ||
573aba85 | 226 | /* The file name to which we should write a precompiled header, or |
227 | NULL if no header will be written in this compile. */ | |
228 | ||
229 | const char *pch_file; | |
230 | ||
1ed9d5f5 | 231 | /* Nonzero if an ISO standard was selected. It rejects macros in the |
232 | user's namespace. */ | |
233 | int flag_iso; | |
234 | ||
235 | /* Nonzero if -undef was given. It suppresses target built-in macros | |
236 | and assertions. */ | |
237 | int flag_undef; | |
238 | ||
0270ae90 | 239 | /* Nonzero means don't recognize the non-ANSI builtin functions. */ |
240 | ||
241 | int flag_no_builtin; | |
242 | ||
243 | /* Nonzero means don't recognize the non-ANSI builtin functions. | |
244 | -ansi sets this. */ | |
245 | ||
246 | int flag_no_nonansi_builtin; | |
247 | ||
174fcc61 | 248 | /* Nonzero means give `double' the same size as `float'. */ |
249 | ||
250 | int flag_short_double; | |
251 | ||
252 | /* Nonzero means give `wchar_t' the same size as `short'. */ | |
253 | ||
254 | int flag_short_wchar; | |
255 | ||
07ebd091 | 256 | /* Nonzero means allow Microsoft extensions without warnings or errors. */ |
257 | int flag_ms_extensions; | |
258 | ||
574a6990 | 259 | /* Nonzero means don't recognize the keyword `asm'. */ |
260 | ||
261 | int flag_no_asm; | |
262 | ||
263 | /* Nonzero means give string constants the type `const char *', as mandated | |
264 | by the standard. */ | |
265 | ||
266 | int flag_const_strings; | |
267 | ||
574a6990 | 268 | /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */ |
269 | ||
270 | int flag_signed_bitfields = 1; | |
271 | int explicit_flag_signed_bitfields; | |
272 | ||
574a6990 | 273 | /* Nonzero means warn about deprecated conversion from string constant to |
274 | `char *'. */ | |
275 | ||
276 | int warn_write_strings; | |
277 | ||
1cae46be | 278 | /* Warn about #pragma directives that are not recognized. */ |
574a6990 | 279 | |
1cae46be | 280 | int warn_unknown_pragmas; /* Tri state variable. */ |
574a6990 | 281 | |
574a6990 | 282 | /* Warn about format/argument anomalies in calls to formatted I/O functions |
283 | (*printf, *scanf, strftime, strfmon, etc.). */ | |
284 | ||
285 | int warn_format; | |
286 | ||
c17b85ea | 287 | /* Zero means that faster, ...NonNil variants of objc_msgSend... |
288 | calls will be used in ObjC; passing nil receivers to such calls | |
289 | will most likely result in crashes. */ | |
290 | int flag_nil_receivers = 1; | |
291 | ||
292 | /* Nonzero means that we will allow new ObjC exception syntax (@throw, | |
293 | @try, etc.) in source code. */ | |
294 | int flag_objc_exceptions = 0; | |
295 | ||
e24e8df7 | 296 | /* Nonzero means that we generate NeXT setjmp based exceptions. */ |
297 | int flag_objc_sjlj_exceptions = -1; | |
298 | ||
c17b85ea | 299 | /* Nonzero means that code generation will be altered to support |
300 | "zero-link" execution. This currently affects ObjC only, but may | |
301 | affect other languages in the future. */ | |
302 | int flag_zero_link = 0; | |
303 | ||
304 | /* Nonzero means emit an '__OBJC, __image_info' for the current translation | |
305 | unit. It will inform the ObjC runtime that class definition(s) herein | |
306 | contained are to replace one(s) previously loaded. */ | |
307 | int flag_replace_objc_classes = 0; | |
b27ac6b5 | 308 | |
574a6990 | 309 | /* C/ObjC language option variables. */ |
310 | ||
311 | ||
574a6990 | 312 | /* Nonzero means allow type mismatches in conditional expressions; |
313 | just make their values `void'. */ | |
314 | ||
315 | int flag_cond_mismatch; | |
316 | ||
317 | /* Nonzero means enable C89 Amendment 1 features. */ | |
318 | ||
319 | int flag_isoc94; | |
320 | ||
321 | /* Nonzero means use the ISO C99 dialect of C. */ | |
322 | ||
323 | int flag_isoc99; | |
324 | ||
8b332087 | 325 | /* Nonzero means that we have builtin functions, and main is an int. */ |
574a6990 | 326 | |
327 | int flag_hosted = 1; | |
328 | ||
574a6990 | 329 | /* Warn if main is suspicious. */ |
330 | ||
331 | int warn_main; | |
332 | ||
574a6990 | 333 | |
334 | /* ObjC language option variables. */ | |
335 | ||
336 | ||
337 | /* Open and close the file for outputting class declarations, if | |
338 | requested (ObjC). */ | |
339 | ||
340 | int flag_gen_declaration; | |
341 | ||
342 | /* Generate code for GNU or NeXT runtime environment. */ | |
343 | ||
344 | #ifdef NEXT_OBJC_RUNTIME | |
345 | int flag_next_runtime = 1; | |
346 | #else | |
347 | int flag_next_runtime = 0; | |
348 | #endif | |
349 | ||
350 | /* Tells the compiler that this is a special run. Do not perform any | |
351 | compiling, instead we are to test some platform dependent features | |
352 | and output a C header file with appropriate definitions. */ | |
353 | ||
354 | int print_struct_values; | |
355 | ||
356 | /* ???. Undocumented. */ | |
357 | ||
358 | const char *constant_string_class_name; | |
359 | ||
574a6990 | 360 | |
361 | /* C++ language option variables. */ | |
362 | ||
363 | ||
364 | /* Nonzero means don't recognize any extension keywords. */ | |
365 | ||
366 | int flag_no_gnu_keywords; | |
367 | ||
368 | /* Nonzero means do emit exported implementations of functions even if | |
369 | they can be inlined. */ | |
370 | ||
371 | int flag_implement_inlines = 1; | |
372 | ||
574a6990 | 373 | /* Nonzero means that implicit instantiations will be emitted if needed. */ |
374 | ||
375 | int flag_implicit_templates = 1; | |
376 | ||
377 | /* Nonzero means that implicit instantiations of inline templates will be | |
378 | emitted if needed, even if instantiations of non-inline templates | |
379 | aren't. */ | |
380 | ||
381 | int flag_implicit_inline_templates = 1; | |
382 | ||
383 | /* Nonzero means generate separate instantiation control files and | |
384 | juggle them at link time. */ | |
385 | ||
386 | int flag_use_repository; | |
387 | ||
388 | /* Nonzero if we want to issue diagnostics that the standard says are not | |
389 | required. */ | |
390 | ||
391 | int flag_optional_diags = 1; | |
392 | ||
393 | /* Nonzero means we should attempt to elide constructors when possible. */ | |
394 | ||
395 | int flag_elide_constructors = 1; | |
396 | ||
397 | /* Nonzero means that member functions defined in class scope are | |
398 | inline by default. */ | |
399 | ||
400 | int flag_default_inline = 1; | |
401 | ||
402 | /* Controls whether compiler generates 'type descriptor' that give | |
403 | run-time type information. */ | |
404 | ||
405 | int flag_rtti = 1; | |
406 | ||
407 | /* Nonzero if we want to conserve space in the .o files. We do this | |
408 | by putting uninitialized data and runtime initialized data into | |
409 | .common instead of .data at the expense of not flagging multiple | |
410 | definitions. */ | |
411 | ||
412 | int flag_conserve_space; | |
413 | ||
414 | /* Nonzero if we want to obey access control semantics. */ | |
415 | ||
416 | int flag_access_control = 1; | |
417 | ||
418 | /* Nonzero if we want to check the return value of new and avoid calling | |
419 | constructors if it is a null pointer. */ | |
420 | ||
421 | int flag_check_new; | |
422 | ||
423 | /* Nonzero if we want the new ISO rules for pushing a new scope for `for' | |
424 | initialization variables. | |
425 | 0: Old rules, set by -fno-for-scope. | |
426 | 2: New ISO rules, set by -ffor-scope. | |
427 | 1: Try to implement new ISO rules, but with backup compatibility | |
428 | (and warnings). This is the default, for now. */ | |
429 | ||
430 | int flag_new_for_scope = 1; | |
431 | ||
432 | /* Nonzero if we want to emit defined symbols with common-like linkage as | |
433 | weak symbols where possible, in order to conform to C++ semantics. | |
434 | Otherwise, emit them as local symbols. */ | |
435 | ||
436 | int flag_weak = 1; | |
437 | ||
e7aa92b2 | 438 | /* 0 means we want the preprocessor to not emit line directives for |
439 | the current working directory. 1 means we want it to do it. -1 | |
440 | means we should decide depending on whether debugging information | |
441 | is being emitted or not. */ | |
442 | ||
443 | int flag_working_directory = -1; | |
444 | ||
574a6990 | 445 | /* Nonzero to use __cxa_atexit, rather than atexit, to register |
446 | destructors for local statics and global objects. */ | |
447 | ||
448 | int flag_use_cxa_atexit = DEFAULT_USE_CXA_ATEXIT; | |
449 | ||
574a6990 | 450 | /* Nonzero means make the default pedwarns warnings instead of errors. |
451 | The value of this flag is ignored if -pedantic is specified. */ | |
452 | ||
453 | int flag_permissive; | |
454 | ||
455 | /* Nonzero means to implement standard semantics for exception | |
456 | specifications, calling unexpected if an exception is thrown that | |
457 | doesn't match the specification. Zero means to treat them as | |
458 | assertions and optimize accordingly, but not check them. */ | |
459 | ||
460 | int flag_enforce_eh_specs = 1; | |
461 | ||
462 | /* Nonzero means warn about implicit declarations. */ | |
463 | ||
464 | int warn_implicit = 1; | |
465 | ||
574a6990 | 466 | /* Maximum template instantiation depth. This limit is rather |
467 | arbitrary, but it exists to limit the time it takes to notice | |
468 | infinite template instantiations. */ | |
469 | ||
470 | int max_tinst_depth = 500; | |
471 | ||
472 | ||
473 | ||
988fc1d1 | 474 | /* The elements of `ridpointers' are identifier nodes for the reserved |
475 | type names and storage classes. It is indexed by a RID_... value. */ | |
476 | tree *ridpointers; | |
477 | ||
1cae46be | 478 | tree (*make_fname_decl) (tree, int); |
9e5a737d | 479 | |
4ee9c684 | 480 | /* If non-NULL, the address of a language-specific function that |
481 | returns 1 for language-specific statement codes. */ | |
482 | int (*lang_statement_code_p) (enum tree_code); | |
483 | ||
e41f0d80 | 484 | /* If non-NULL, the address of a language-specific function that takes |
485 | any action required right before expand_function_end is called. */ | |
1cae46be | 486 | void (*lang_expand_function_end) (void); |
e41f0d80 | 487 | |
e78703c1 | 488 | /* Nonzero means the expression being parsed will never be evaluated. |
489 | This is a count, since unevaluated expressions can nest. */ | |
490 | int skip_evaluation; | |
491 | ||
2c0e001b | 492 | /* Information about how a function name is generated. */ |
65b7f83f | 493 | struct fname_var_t |
494 | { | |
e99c3a1d | 495 | tree *const decl; /* pointer to the VAR_DECL. */ |
496 | const unsigned rid; /* RID number for the identifier. */ | |
497 | const int pretty; /* How pretty is it? */ | |
65b7f83f | 498 | }; |
499 | ||
2c0e001b | 500 | /* The three ways of getting then name of the current function. */ |
65b7f83f | 501 | |
502 | const struct fname_var_t fname_vars[] = | |
503 | { | |
2c0e001b | 504 | /* C99 compliant __func__, must be first. */ |
65b7f83f | 505 | {&c99_function_name_decl_node, RID_C99_FUNCTION_NAME, 0}, |
2c0e001b | 506 | /* GCC __FUNCTION__ compliant. */ |
65b7f83f | 507 | {&function_name_decl_node, RID_FUNCTION_NAME, 0}, |
2c0e001b | 508 | /* GCC __PRETTY_FUNCTION__ compliant. */ |
65b7f83f | 509 | {&pretty_function_name_decl_node, RID_PRETTY_FUNCTION_NAME, 1}, |
510 | {NULL, 0, 0}, | |
511 | }; | |
512 | ||
1cae46be | 513 | static int constant_fits_type_p (tree, tree); |
2ca392fd | 514 | static tree check_case_value (tree); |
515 | static bool check_case_bounds (tree, tree, tree *, tree *); | |
be43ff5a | 516 | |
1cae46be | 517 | static tree handle_packed_attribute (tree *, tree, tree, int, bool *); |
518 | static tree handle_nocommon_attribute (tree *, tree, tree, int, bool *); | |
519 | static tree handle_common_attribute (tree *, tree, tree, int, bool *); | |
520 | static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *); | |
521 | static tree handle_noinline_attribute (tree *, tree, tree, int, bool *); | |
522 | static tree handle_always_inline_attribute (tree *, tree, tree, int, | |
523 | bool *); | |
524 | static tree handle_used_attribute (tree *, tree, tree, int, bool *); | |
525 | static tree handle_unused_attribute (tree *, tree, tree, int, bool *); | |
526 | static tree handle_const_attribute (tree *, tree, tree, int, bool *); | |
527 | static tree handle_transparent_union_attribute (tree *, tree, tree, | |
528 | int, bool *); | |
529 | static tree handle_constructor_attribute (tree *, tree, tree, int, bool *); | |
530 | static tree handle_destructor_attribute (tree *, tree, tree, int, bool *); | |
531 | static tree handle_mode_attribute (tree *, tree, tree, int, bool *); | |
532 | static tree handle_section_attribute (tree *, tree, tree, int, bool *); | |
533 | static tree handle_aligned_attribute (tree *, tree, tree, int, bool *); | |
534 | static tree handle_weak_attribute (tree *, tree, tree, int, bool *) ; | |
535 | static tree handle_alias_attribute (tree *, tree, tree, int, bool *); | |
536 | static tree handle_visibility_attribute (tree *, tree, tree, int, | |
537 | bool *); | |
538 | static tree handle_tls_model_attribute (tree *, tree, tree, int, | |
539 | bool *); | |
540 | static tree handle_no_instrument_function_attribute (tree *, tree, | |
541 | tree, int, bool *); | |
542 | static tree handle_malloc_attribute (tree *, tree, tree, int, bool *); | |
543 | static tree handle_no_limit_stack_attribute (tree *, tree, tree, int, | |
544 | bool *); | |
545 | static tree handle_pure_attribute (tree *, tree, tree, int, bool *); | |
546 | static tree handle_deprecated_attribute (tree *, tree, tree, int, | |
547 | bool *); | |
548 | static tree handle_vector_size_attribute (tree *, tree, tree, int, | |
549 | bool *); | |
550 | static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *); | |
551 | static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *); | |
552 | static tree handle_cleanup_attribute (tree *, tree, tree, int, bool *); | |
8a8cdb8d | 553 | static tree handle_warn_unused_result_attribute (tree *, tree, tree, int, |
554 | bool *); | |
1cae46be | 555 | |
556 | static void check_function_nonnull (tree, tree); | |
557 | static void check_nonnull_arg (void *, tree, unsigned HOST_WIDE_INT); | |
558 | static bool nonnull_check_p (tree, unsigned HOST_WIDE_INT); | |
559 | static bool get_nonnull_operand (tree, unsigned HOST_WIDE_INT *); | |
860251be | 560 | static int resort_field_decl_cmp (const void *, const void *); |
dbf6c367 | 561 | |
f8e93a2e | 562 | /* Table of machine-independent attributes common to all C-like languages. */ |
563 | const struct attribute_spec c_common_attribute_table[] = | |
564 | { | |
565 | /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ | |
566 | { "packed", 0, 0, false, false, false, | |
1cae46be | 567 | handle_packed_attribute }, |
f8e93a2e | 568 | { "nocommon", 0, 0, true, false, false, |
569 | handle_nocommon_attribute }, | |
570 | { "common", 0, 0, true, false, false, | |
571 | handle_common_attribute }, | |
572 | /* FIXME: logically, noreturn attributes should be listed as | |
573 | "false, true, true" and apply to function types. But implementing this | |
574 | would require all the places in the compiler that use TREE_THIS_VOLATILE | |
575 | on a decl to identify non-returning functions to be located and fixed | |
576 | to check the function type instead. */ | |
577 | { "noreturn", 0, 0, true, false, false, | |
578 | handle_noreturn_attribute }, | |
579 | { "volatile", 0, 0, true, false, false, | |
580 | handle_noreturn_attribute }, | |
581 | { "noinline", 0, 0, true, false, false, | |
582 | handle_noinline_attribute }, | |
583 | { "always_inline", 0, 0, true, false, false, | |
584 | handle_always_inline_attribute }, | |
585 | { "used", 0, 0, true, false, false, | |
586 | handle_used_attribute }, | |
587 | { "unused", 0, 0, false, false, false, | |
588 | handle_unused_attribute }, | |
589 | /* The same comments as for noreturn attributes apply to const ones. */ | |
590 | { "const", 0, 0, true, false, false, | |
591 | handle_const_attribute }, | |
592 | { "transparent_union", 0, 0, false, false, false, | |
593 | handle_transparent_union_attribute }, | |
594 | { "constructor", 0, 0, true, false, false, | |
595 | handle_constructor_attribute }, | |
596 | { "destructor", 0, 0, true, false, false, | |
597 | handle_destructor_attribute }, | |
598 | { "mode", 1, 1, false, true, false, | |
599 | handle_mode_attribute }, | |
600 | { "section", 1, 1, true, false, false, | |
601 | handle_section_attribute }, | |
602 | { "aligned", 0, 1, false, false, false, | |
603 | handle_aligned_attribute }, | |
604 | { "weak", 0, 0, true, false, false, | |
605 | handle_weak_attribute }, | |
606 | { "alias", 1, 1, true, false, false, | |
607 | handle_alias_attribute }, | |
608 | { "no_instrument_function", 0, 0, true, false, false, | |
609 | handle_no_instrument_function_attribute }, | |
610 | { "malloc", 0, 0, true, false, false, | |
611 | handle_malloc_attribute }, | |
612 | { "no_stack_limit", 0, 0, true, false, false, | |
613 | handle_no_limit_stack_attribute }, | |
614 | { "pure", 0, 0, true, false, false, | |
615 | handle_pure_attribute }, | |
616 | { "deprecated", 0, 0, false, false, false, | |
617 | handle_deprecated_attribute }, | |
618 | { "vector_size", 1, 1, false, true, false, | |
619 | handle_vector_size_attribute }, | |
b212f378 | 620 | { "visibility", 1, 1, false, false, false, |
f8e93a2e | 621 | handle_visibility_attribute }, |
24dfead4 | 622 | { "tls_model", 1, 1, true, false, false, |
623 | handle_tls_model_attribute }, | |
dbf6c367 | 624 | { "nonnull", 0, -1, false, true, true, |
625 | handle_nonnull_attribute }, | |
fa987697 | 626 | { "nothrow", 0, 0, true, false, false, |
627 | handle_nothrow_attribute }, | |
cb59f969 | 628 | { "may_alias", 0, 0, false, true, false, NULL }, |
7acb29a3 | 629 | { "cleanup", 1, 1, true, false, false, |
630 | handle_cleanup_attribute }, | |
8a8cdb8d | 631 | { "warn_unused_result", 0, 0, false, true, true, |
632 | handle_warn_unused_result_attribute }, | |
f8e93a2e | 633 | { NULL, 0, 0, false, false, false, NULL } |
634 | }; | |
635 | ||
636 | /* Give the specifications for the format attributes, used by C and all | |
d716ce75 | 637 | descendants. */ |
f8e93a2e | 638 | |
639 | const struct attribute_spec c_common_format_attribute_table[] = | |
640 | { | |
641 | /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ | |
642 | { "format", 3, 3, false, true, true, | |
643 | handle_format_attribute }, | |
644 | { "format_arg", 1, 1, false, true, true, | |
645 | handle_format_arg_attribute }, | |
646 | { NULL, 0, 0, false, false, false, NULL } | |
647 | }; | |
648 | ||
2c0e001b | 649 | /* Push current bindings for the function name VAR_DECLS. */ |
f4e3c278 | 650 | |
651 | void | |
1cae46be | 652 | start_fname_decls (void) |
f4e3c278 | 653 | { |
65b7f83f | 654 | unsigned ix; |
655 | tree saved = NULL_TREE; | |
1cae46be | 656 | |
65b7f83f | 657 | for (ix = 0; fname_vars[ix].decl; ix++) |
658 | { | |
659 | tree decl = *fname_vars[ix].decl; | |
f4e3c278 | 660 | |
65b7f83f | 661 | if (decl) |
662 | { | |
663 | saved = tree_cons (decl, build_int_2 (ix, 0), saved); | |
664 | *fname_vars[ix].decl = NULL_TREE; | |
665 | } | |
666 | } | |
667 | if (saved || saved_function_name_decls) | |
668 | /* Normally they'll have been NULL, so only push if we've got a | |
669 | stack, or they are non-NULL. */ | |
670 | saved_function_name_decls = tree_cons (saved, NULL_TREE, | |
671 | saved_function_name_decls); | |
672 | } | |
673 | ||
2363ef00 | 674 | /* Finish up the current bindings, adding them into the current function's |
675 | statement tree. This must be done _before_ finish_stmt_tree is called. | |
676 | If there is no current function, we must be at file scope and no statements | |
677 | are involved. Pop the previous bindings. */ | |
65b7f83f | 678 | |
679 | void | |
1cae46be | 680 | finish_fname_decls (void) |
65b7f83f | 681 | { |
682 | unsigned ix; | |
2363ef00 | 683 | tree stmts = NULL_TREE; |
65b7f83f | 684 | tree stack = saved_function_name_decls; |
685 | ||
686 | for (; stack && TREE_VALUE (stack); stack = TREE_CHAIN (stack)) | |
2363ef00 | 687 | append_to_statement_list (TREE_VALUE (stack), &stmts); |
1cae46be | 688 | |
2363ef00 | 689 | if (stmts) |
65b7f83f | 690 | { |
2363ef00 | 691 | tree *bodyp = &DECL_SAVED_TREE (current_function_decl); |
5c423bd6 | 692 | |
2363ef00 | 693 | if (TREE_CODE (*bodyp) == BIND_EXPR) |
694 | bodyp = &BIND_EXPR_BODY (*bodyp); | |
81010c97 | 695 | |
2363ef00 | 696 | append_to_statement_list (*bodyp, &stmts); |
697 | *bodyp = stmts; | |
65b7f83f | 698 | } |
1cae46be | 699 | |
65b7f83f | 700 | for (ix = 0; fname_vars[ix].decl; ix++) |
701 | *fname_vars[ix].decl = NULL_TREE; | |
1cae46be | 702 | |
65b7f83f | 703 | if (stack) |
f4e3c278 | 704 | { |
2c0e001b | 705 | /* We had saved values, restore them. */ |
65b7f83f | 706 | tree saved; |
707 | ||
708 | for (saved = TREE_PURPOSE (stack); saved; saved = TREE_CHAIN (saved)) | |
709 | { | |
710 | tree decl = TREE_PURPOSE (saved); | |
711 | unsigned ix = TREE_INT_CST_LOW (TREE_VALUE (saved)); | |
1cae46be | 712 | |
65b7f83f | 713 | *fname_vars[ix].decl = decl; |
714 | } | |
715 | stack = TREE_CHAIN (stack); | |
f4e3c278 | 716 | } |
65b7f83f | 717 | saved_function_name_decls = stack; |
718 | } | |
719 | ||
81010c97 | 720 | /* Return the text name of the current function, suitably prettified |
5fc7fa69 | 721 | by PRETTY_P. Return string must be freed by caller. */ |
65b7f83f | 722 | |
723 | const char * | |
1cae46be | 724 | fname_as_string (int pretty_p) |
65b7f83f | 725 | { |
9ad4bb1e | 726 | const char *name = "top level"; |
5fc7fa69 | 727 | char *namep; |
9ad4bb1e | 728 | int vrb = 2; |
729 | ||
730 | if (! pretty_p) | |
731 | { | |
732 | name = ""; | |
733 | vrb = 0; | |
734 | } | |
735 | ||
736 | if (current_function_decl) | |
dc24ddbd | 737 | name = lang_hooks.decl_printable_name (current_function_decl, vrb); |
9ad4bb1e | 738 | |
5fc7fa69 | 739 | if (c_lex_string_translate) |
740 | { | |
741 | int len = strlen (name) + 3; /* Two for '"'s. One for NULL. */ | |
742 | cpp_string cstr = { 0, 0 }, strname; | |
743 | ||
4fd61bc6 | 744 | namep = XNEWVEC (char, len); |
5fc7fa69 | 745 | snprintf (namep, len, "\"%s\"", name); |
746 | strname.text = (unsigned char *) namep; | |
747 | strname.len = len - 1; | |
748 | ||
749 | if (cpp_interpret_string (parse_in, &strname, 1, &cstr, false)) | |
750 | return (char *) cstr.text; | |
751 | } | |
752 | else | |
dd492705 | 753 | namep = xstrdup (name); |
5fc7fa69 | 754 | |
755 | return namep; | |
65b7f83f | 756 | } |
757 | ||
05f9ea78 | 758 | /* Expand DECL if it declares an entity not handled by the |
759 | common code. */ | |
760 | ||
761 | int | |
762 | c_expand_decl (tree decl) | |
763 | { | |
764 | if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl)) | |
765 | { | |
766 | /* Let the back-end know about this variable. */ | |
767 | if (!anon_aggr_type_p (TREE_TYPE (decl))) | |
768 | emit_local_var (decl); | |
769 | else | |
770 | expand_anon_union_decl (decl, NULL_TREE, | |
771 | DECL_ANON_UNION_ELEMS (decl)); | |
772 | } | |
05f9ea78 | 773 | else |
774 | return 0; | |
775 | ||
776 | return 1; | |
777 | } | |
778 | ||
779 | ||
65b7f83f | 780 | /* Return the VAR_DECL for a const char array naming the current |
781 | function. If the VAR_DECL has not yet been created, create it | |
782 | now. RID indicates how it should be formatted and IDENTIFIER_NODE | |
783 | ID is its name (unfortunately C and C++ hold the RID values of | |
784 | keywords in different places, so we can't derive RID from ID in | |
dd5b4b36 | 785 | this language independent code. */ |
65b7f83f | 786 | |
787 | tree | |
1cae46be | 788 | fname_decl (unsigned int rid, tree id) |
65b7f83f | 789 | { |
790 | unsigned ix; | |
791 | tree decl = NULL_TREE; | |
792 | ||
793 | for (ix = 0; fname_vars[ix].decl; ix++) | |
794 | if (fname_vars[ix].rid == rid) | |
795 | break; | |
796 | ||
797 | decl = *fname_vars[ix].decl; | |
798 | if (!decl) | |
f4e3c278 | 799 | { |
2222b3c6 | 800 | /* If a tree is built here, it would normally have the lineno of |
801 | the current statement. Later this tree will be moved to the | |
802 | beginning of the function and this line number will be wrong. | |
803 | To avoid this problem set the lineno to 0 here; that prevents | |
7299020b | 804 | it from appearing in the RTL. */ |
2363ef00 | 805 | tree stmts; |
9a6486a6 | 806 | location_t saved_location = input_location; |
807 | #ifdef USE_MAPPED_LOCATION | |
808 | input_location = UNKNOWN_LOCATION; | |
809 | #else | |
fa70df70 | 810 | input_line = 0; |
9a6486a6 | 811 | #endif |
1cae46be | 812 | |
2363ef00 | 813 | stmts = push_stmt_list (); |
65b7f83f | 814 | decl = (*make_fname_decl) (id, fname_vars[ix].pretty); |
2363ef00 | 815 | stmts = pop_stmt_list (stmts); |
816 | if (!IS_EMPTY_STMT (stmts)) | |
817 | saved_function_name_decls | |
818 | = tree_cons (decl, stmts, saved_function_name_decls); | |
65b7f83f | 819 | *fname_vars[ix].decl = decl; |
9a6486a6 | 820 | input_location = saved_location; |
f4e3c278 | 821 | } |
65b7f83f | 822 | if (!ix && !current_function_decl) |
9bc3739f | 823 | pedwarn ("%J'%D' is not defined outside of function scope", decl, decl); |
81010c97 | 824 | |
65b7f83f | 825 | return decl; |
f4e3c278 | 826 | } |
827 | ||
070236f0 | 828 | /* Given a STRING_CST, give it a suitable array-of-chars data type. */ |
b0fc3e72 | 829 | |
830 | tree | |
1cae46be | 831 | fix_string_type (tree value) |
b0fc3e72 | 832 | { |
070236f0 | 833 | const int wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT; |
834 | const int wide_flag = TREE_TYPE (value) == wchar_array_type_node; | |
82cfc7f7 | 835 | const int nchars_max = flag_isoc99 ? 4095 : 509; |
070236f0 | 836 | int length = TREE_STRING_LENGTH (value); |
837 | int nchars; | |
b0fc3e72 | 838 | |
73be5127 | 839 | /* Compute the number of elements, for the array type. */ |
b0fc3e72 | 840 | nchars = wide_flag ? length / wchar_bytes : length; |
841 | ||
c0f19401 | 842 | if (pedantic && nchars - 1 > nchars_max && !c_dialect_cxx ()) |
960bf856 | 843 | pedwarn ("string length `%d' is greater than the length `%d' ISO C%d compilers are required to support", |
89e32525 | 844 | nchars - 1, nchars_max, flag_isoc99 ? 99 : 89); |
82cfc7f7 | 845 | |
b0fc3e72 | 846 | /* Create the array type for the string constant. |
847 | -Wwrite-strings says make the string constant an array of const char | |
3a10ba35 | 848 | so that copying it to a non-const pointer will get a warning. |
849 | For C++, this is the standard behavior. */ | |
a814bad5 | 850 | if (flag_const_strings) |
b0fc3e72 | 851 | { |
852 | tree elements | |
853 | = build_type_variant (wide_flag ? wchar_type_node : char_type_node, | |
854 | 1, 0); | |
855 | TREE_TYPE (value) | |
856 | = build_array_type (elements, | |
857 | build_index_type (build_int_2 (nchars - 1, 0))); | |
858 | } | |
859 | else | |
860 | TREE_TYPE (value) | |
861 | = build_array_type (wide_flag ? wchar_type_node : char_type_node, | |
862 | build_index_type (build_int_2 (nchars - 1, 0))); | |
3a10ba35 | 863 | |
b8e3b7ad | 864 | TREE_CONSTANT (value) = 1; |
4ee9c684 | 865 | TREE_INVARIANT (value) = 1; |
a814bad5 | 866 | TREE_READONLY (value) = 1; |
b0fc3e72 | 867 | TREE_STATIC (value) = 1; |
868 | return value; | |
869 | } | |
870 | \f | |
2a1736ed | 871 | /* Print a warning if a constant expression had overflow in folding. |
872 | Invoke this function on every expression that the language | |
873 | requires to be a constant expression. | |
874 | Note the ANSI C standard says it is erroneous for a | |
875 | constant expression to overflow. */ | |
b2806639 | 876 | |
877 | void | |
1cae46be | 878 | constant_expression_warning (tree value) |
b2806639 | 879 | { |
837e1122 | 880 | if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST |
886cfd4f | 881 | || TREE_CODE (value) == VECTOR_CST |
837e1122 | 882 | || TREE_CODE (value) == COMPLEX_CST) |
883 | && TREE_CONSTANT_OVERFLOW (value) && pedantic) | |
884 | pedwarn ("overflow in constant expression"); | |
2a1736ed | 885 | } |
886 | ||
887 | /* Print a warning if an expression had overflow in folding. | |
888 | Invoke this function on every expression that | |
889 | (1) appears in the source code, and | |
890 | (2) might be a constant expression that overflowed, and | |
891 | (3) is not already checked by convert_and_check; | |
892 | however, do not invoke this function on operands of explicit casts. */ | |
893 | ||
894 | void | |
1cae46be | 895 | overflow_warning (tree value) |
2a1736ed | 896 | { |
837e1122 | 897 | if ((TREE_CODE (value) == INTEGER_CST |
898 | || (TREE_CODE (value) == COMPLEX_CST | |
899 | && TREE_CODE (TREE_REALPART (value)) == INTEGER_CST)) | |
900 | && TREE_OVERFLOW (value)) | |
2a1736ed | 901 | { |
b04da9b5 | 902 | TREE_OVERFLOW (value) = 0; |
e78703c1 | 903 | if (skip_evaluation == 0) |
904 | warning ("integer overflow in expression"); | |
2a1736ed | 905 | } |
837e1122 | 906 | else if ((TREE_CODE (value) == REAL_CST |
907 | || (TREE_CODE (value) == COMPLEX_CST | |
908 | && TREE_CODE (TREE_REALPART (value)) == REAL_CST)) | |
909 | && TREE_OVERFLOW (value)) | |
910 | { | |
911 | TREE_OVERFLOW (value) = 0; | |
e78703c1 | 912 | if (skip_evaluation == 0) |
913 | warning ("floating point overflow in expression"); | |
837e1122 | 914 | } |
886cfd4f | 915 | else if (TREE_CODE (value) == VECTOR_CST && TREE_OVERFLOW (value)) |
916 | { | |
917 | TREE_OVERFLOW (value) = 0; | |
918 | if (skip_evaluation == 0) | |
919 | warning ("vector overflow in expression"); | |
920 | } | |
2a1736ed | 921 | } |
922 | ||
923 | /* Print a warning if a large constant is truncated to unsigned, | |
924 | or if -Wconversion is used and a constant < 0 is converted to unsigned. | |
925 | Invoke this function on every expression that might be implicitly | |
926 | converted to an unsigned type. */ | |
927 | ||
928 | void | |
1cae46be | 929 | unsigned_conversion_warning (tree result, tree operand) |
2a1736ed | 930 | { |
4070745f | 931 | tree type = TREE_TYPE (result); |
932 | ||
2a1736ed | 933 | if (TREE_CODE (operand) == INTEGER_CST |
4070745f | 934 | && TREE_CODE (type) == INTEGER_TYPE |
78a8ed03 | 935 | && TYPE_UNSIGNED (type) |
e78703c1 | 936 | && skip_evaluation == 0 |
4070745f | 937 | && !int_fits_type_p (operand, type)) |
2a1736ed | 938 | { |
4070745f | 939 | if (!int_fits_type_p (operand, c_common_signed_type (type))) |
2a1736ed | 940 | /* This detects cases like converting -129 or 256 to unsigned char. */ |
454b5afb | 941 | warning ("large integer implicitly truncated to unsigned type"); |
2a1736ed | 942 | else if (warn_conversion) |
454b5afb | 943 | warning ("negative integer implicitly converted to unsigned type"); |
2a1736ed | 944 | } |
945 | } | |
946 | ||
7f728835 | 947 | /* Nonzero if constant C has a value that is permissible |
948 | for type TYPE (an INTEGER_TYPE). */ | |
949 | ||
950 | static int | |
1cae46be | 951 | constant_fits_type_p (tree c, tree type) |
7f728835 | 952 | { |
953 | if (TREE_CODE (c) == INTEGER_CST) | |
954 | return int_fits_type_p (c, type); | |
955 | ||
956 | c = convert (type, c); | |
957 | return !TREE_OVERFLOW (c); | |
1cae46be | 958 | } |
7f728835 | 959 | |
8b4b9810 | 960 | /* Nonzero if vector types T1 and T2 can be converted to each other |
961 | without an explicit cast. */ | |
962 | int | |
963 | vector_types_convertible_p (tree t1, tree t2) | |
964 | { | |
965 | return targetm.vector_opaque_p (t1) | |
966 | || targetm.vector_opaque_p (t2) | |
4418a1d4 | 967 | || (tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2)) |
968 | && INTEGRAL_TYPE_P (TREE_TYPE (t1)) | |
969 | == INTEGRAL_TYPE_P (TREE_TYPE (t2))); | |
8b4b9810 | 970 | } |
971 | ||
2a1736ed | 972 | /* Convert EXPR to TYPE, warning about conversion problems with constants. |
973 | Invoke this function on every expression that is converted implicitly, | |
974 | i.e. because of language rules and not because of an explicit cast. */ | |
975 | ||
976 | tree | |
1cae46be | 977 | convert_and_check (tree type, tree expr) |
2a1736ed | 978 | { |
979 | tree t = convert (type, expr); | |
980 | if (TREE_CODE (t) == INTEGER_CST) | |
981 | { | |
b04da9b5 | 982 | if (TREE_OVERFLOW (t)) |
2a1736ed | 983 | { |
b04da9b5 | 984 | TREE_OVERFLOW (t) = 0; |
985 | ||
2c4232f8 | 986 | /* Do not diagnose overflow in a constant expression merely |
987 | because a conversion overflowed. */ | |
988 | TREE_CONSTANT_OVERFLOW (t) = TREE_CONSTANT_OVERFLOW (expr); | |
989 | ||
b04da9b5 | 990 | /* No warning for converting 0x80000000 to int. */ |
78a8ed03 | 991 | if (!(TYPE_UNSIGNED (type) < TYPE_UNSIGNED (TREE_TYPE (expr)) |
b04da9b5 | 992 | && TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE |
993 | && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (expr)))) | |
96730c20 | 994 | /* If EXPR fits in the unsigned version of TYPE, |
995 | don't warn unless pedantic. */ | |
e78703c1 | 996 | if ((pedantic |
78a8ed03 | 997 | || TYPE_UNSIGNED (type) |
4070745f | 998 | || ! constant_fits_type_p (expr, |
999 | c_common_unsigned_type (type))) | |
4ee9c684 | 1000 | && skip_evaluation == 0) |
d1f11193 | 1001 | warning ("overflow in implicit constant conversion"); |
2a1736ed | 1002 | } |
1003 | else | |
1004 | unsigned_conversion_warning (t, expr); | |
1005 | } | |
1006 | return t; | |
b2806639 | 1007 | } |
1008 | \f | |
4e91a871 | 1009 | /* A node in a list that describes references to variables (EXPR), which are |
1010 | either read accesses if WRITER is zero, or write accesses, in which case | |
1011 | WRITER is the parent of EXPR. */ | |
1012 | struct tlist | |
1013 | { | |
1014 | struct tlist *next; | |
1015 | tree expr, writer; | |
1016 | }; | |
1017 | ||
1018 | /* Used to implement a cache the results of a call to verify_tree. We only | |
1019 | use this for SAVE_EXPRs. */ | |
1020 | struct tlist_cache | |
1021 | { | |
1022 | struct tlist_cache *next; | |
1023 | struct tlist *cache_before_sp; | |
1024 | struct tlist *cache_after_sp; | |
1025 | tree expr; | |
481c6ce6 | 1026 | }; |
1027 | ||
4e91a871 | 1028 | /* Obstack to use when allocating tlist structures, and corresponding |
1029 | firstobj. */ | |
1030 | static struct obstack tlist_obstack; | |
1031 | static char *tlist_firstobj = 0; | |
1032 | ||
1033 | /* Keep track of the identifiers we've warned about, so we can avoid duplicate | |
1034 | warnings. */ | |
1035 | static struct tlist *warned_ids; | |
1036 | /* SAVE_EXPRs need special treatment. We process them only once and then | |
1037 | cache the results. */ | |
1038 | static struct tlist_cache *save_expr_cache; | |
1039 | ||
1cae46be | 1040 | static void add_tlist (struct tlist **, struct tlist *, tree, int); |
1041 | static void merge_tlist (struct tlist **, struct tlist *, int); | |
1042 | static void verify_tree (tree, struct tlist **, struct tlist **, tree); | |
1043 | static int warning_candidate_p (tree); | |
1044 | static void warn_for_collisions (struct tlist *); | |
1045 | static void warn_for_collisions_1 (tree, tree, struct tlist *, int); | |
1046 | static struct tlist *new_tlist (struct tlist *, tree, tree); | |
481c6ce6 | 1047 | |
4e91a871 | 1048 | /* Create a new struct tlist and fill in its fields. */ |
1049 | static struct tlist * | |
1cae46be | 1050 | new_tlist (struct tlist *next, tree t, tree writer) |
4e91a871 | 1051 | { |
1052 | struct tlist *l; | |
9318f22c | 1053 | l = XOBNEW (&tlist_obstack, struct tlist); |
4e91a871 | 1054 | l->next = next; |
1055 | l->expr = t; | |
1056 | l->writer = writer; | |
1057 | return l; | |
1058 | } | |
1059 | ||
1060 | /* Add duplicates of the nodes found in ADD to the list *TO. If EXCLUDE_WRITER | |
1061 | is nonnull, we ignore any node we find which has a writer equal to it. */ | |
1062 | ||
1063 | static void | |
1cae46be | 1064 | add_tlist (struct tlist **to, struct tlist *add, tree exclude_writer, int copy) |
4e91a871 | 1065 | { |
1066 | while (add) | |
1067 | { | |
1068 | struct tlist *next = add->next; | |
1069 | if (! copy) | |
1070 | add->next = *to; | |
1071 | if (! exclude_writer || add->writer != exclude_writer) | |
1072 | *to = copy ? new_tlist (*to, add->expr, add->writer) : add; | |
1073 | add = next; | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | /* Merge the nodes of ADD into TO. This merging process is done so that for | |
1078 | each variable that already exists in TO, no new node is added; however if | |
1079 | there is a write access recorded in ADD, and an occurrence on TO is only | |
1080 | a read access, then the occurrence in TO will be modified to record the | |
1081 | write. */ | |
481c6ce6 | 1082 | |
1083 | static void | |
1cae46be | 1084 | merge_tlist (struct tlist **to, struct tlist *add, int copy) |
4e91a871 | 1085 | { |
1086 | struct tlist **end = to; | |
1087 | ||
1088 | while (*end) | |
1089 | end = &(*end)->next; | |
1090 | ||
1091 | while (add) | |
1092 | { | |
1093 | int found = 0; | |
1094 | struct tlist *tmp2; | |
1095 | struct tlist *next = add->next; | |
1096 | ||
1097 | for (tmp2 = *to; tmp2; tmp2 = tmp2->next) | |
1098 | if (tmp2->expr == add->expr) | |
1099 | { | |
1100 | found = 1; | |
1101 | if (! tmp2->writer) | |
1102 | tmp2->writer = add->writer; | |
1103 | } | |
1104 | if (! found) | |
1105 | { | |
1106 | *end = copy ? add : new_tlist (NULL, add->expr, add->writer); | |
1107 | end = &(*end)->next; | |
1108 | *end = 0; | |
1109 | } | |
1110 | add = next; | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | /* WRITTEN is a variable, WRITER is its parent. Warn if any of the variable | |
1115 | references in list LIST conflict with it, excluding reads if ONLY writers | |
1116 | is nonzero. */ | |
1117 | ||
1118 | static void | |
1cae46be | 1119 | warn_for_collisions_1 (tree written, tree writer, struct tlist *list, |
1120 | int only_writes) | |
4e91a871 | 1121 | { |
1122 | struct tlist *tmp; | |
1123 | ||
1124 | /* Avoid duplicate warnings. */ | |
1125 | for (tmp = warned_ids; tmp; tmp = tmp->next) | |
1126 | if (tmp->expr == written) | |
1127 | return; | |
1128 | ||
1129 | while (list) | |
1130 | { | |
1131 | if (list->expr == written | |
1132 | && list->writer != writer | |
e4323659 | 1133 | && (! only_writes || list->writer) |
1134 | && DECL_NAME (list->expr)) | |
4e91a871 | 1135 | { |
1136 | warned_ids = new_tlist (warned_ids, written, NULL_TREE); | |
1137 | warning ("operation on `%s' may be undefined", | |
1138 | IDENTIFIER_POINTER (DECL_NAME (list->expr))); | |
1139 | } | |
1140 | list = list->next; | |
1141 | } | |
1142 | } | |
1143 | ||
1144 | /* Given a list LIST of references to variables, find whether any of these | |
1145 | can cause conflicts due to missing sequence points. */ | |
1146 | ||
1147 | static void | |
1cae46be | 1148 | warn_for_collisions (struct tlist *list) |
4e91a871 | 1149 | { |
1150 | struct tlist *tmp; | |
1cae46be | 1151 | |
4e91a871 | 1152 | for (tmp = list; tmp; tmp = tmp->next) |
1153 | { | |
1154 | if (tmp->writer) | |
1155 | warn_for_collisions_1 (tmp->expr, tmp->writer, list, 0); | |
1156 | } | |
1157 | } | |
1158 | ||
734c98be | 1159 | /* Return nonzero if X is a tree that can be verified by the sequence point |
4e91a871 | 1160 | warnings. */ |
1161 | static int | |
1cae46be | 1162 | warning_candidate_p (tree x) |
481c6ce6 | 1163 | { |
4e91a871 | 1164 | return TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == PARM_DECL; |
1165 | } | |
481c6ce6 | 1166 | |
4e91a871 | 1167 | /* Walk the tree X, and record accesses to variables. If X is written by the |
1168 | parent tree, WRITER is the parent. | |
1169 | We store accesses in one of the two lists: PBEFORE_SP, and PNO_SP. If this | |
1170 | expression or its only operand forces a sequence point, then everything up | |
1171 | to the sequence point is stored in PBEFORE_SP. Everything else gets stored | |
1172 | in PNO_SP. | |
1173 | Once we return, we will have emitted warnings if any subexpression before | |
1174 | such a sequence point could be undefined. On a higher level, however, the | |
1175 | sequence point may not be relevant, and we'll merge the two lists. | |
1176 | ||
1177 | Example: (b++, a) + b; | |
1178 | The call that processes the COMPOUND_EXPR will store the increment of B | |
1179 | in PBEFORE_SP, and the use of A in PNO_SP. The higher-level call that | |
1180 | processes the PLUS_EXPR will need to merge the two lists so that | |
1181 | eventually, all accesses end up on the same list (and we'll warn about the | |
1182 | unordered subexpressions b++ and b. | |
1183 | ||
1184 | A note on merging. If we modify the former example so that our expression | |
1185 | becomes | |
1186 | (b++, b) + a | |
1187 | care must be taken not simply to add all three expressions into the final | |
1188 | PNO_SP list. The function merge_tlist takes care of that by merging the | |
1189 | before-SP list of the COMPOUND_EXPR into its after-SP list in a special | |
1190 | way, so that no more than one access to B is recorded. */ | |
481c6ce6 | 1191 | |
4e91a871 | 1192 | static void |
1cae46be | 1193 | verify_tree (tree x, struct tlist **pbefore_sp, struct tlist **pno_sp, |
1194 | tree writer) | |
4e91a871 | 1195 | { |
1196 | struct tlist *tmp_before, *tmp_nosp, *tmp_list2, *tmp_list3; | |
1197 | enum tree_code code; | |
e916c70c | 1198 | char cl; |
481c6ce6 | 1199 | |
e5b75768 | 1200 | /* X may be NULL if it is the operand of an empty statement expression |
1201 | ({ }). */ | |
1202 | if (x == NULL) | |
1203 | return; | |
1204 | ||
4e91a871 | 1205 | restart: |
1206 | code = TREE_CODE (x); | |
e916c70c | 1207 | cl = TREE_CODE_CLASS (code); |
481c6ce6 | 1208 | |
4e91a871 | 1209 | if (warning_candidate_p (x)) |
481c6ce6 | 1210 | { |
4e91a871 | 1211 | *pno_sp = new_tlist (*pno_sp, x, writer); |
1212 | return; | |
1213 | } | |
1214 | ||
1215 | switch (code) | |
1216 | { | |
67b28e3e | 1217 | case CONSTRUCTOR: |
1218 | return; | |
1219 | ||
4e91a871 | 1220 | case COMPOUND_EXPR: |
1221 | case TRUTH_ANDIF_EXPR: | |
1222 | case TRUTH_ORIF_EXPR: | |
1223 | tmp_before = tmp_nosp = tmp_list3 = 0; | |
1224 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
1225 | warn_for_collisions (tmp_nosp); | |
1226 | merge_tlist (pbefore_sp, tmp_before, 0); | |
1227 | merge_tlist (pbefore_sp, tmp_nosp, 0); | |
1228 | verify_tree (TREE_OPERAND (x, 1), &tmp_list3, pno_sp, NULL_TREE); | |
1229 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
1230 | return; | |
1231 | ||
1232 | case COND_EXPR: | |
1233 | tmp_before = tmp_list2 = 0; | |
1234 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_list2, NULL_TREE); | |
1235 | warn_for_collisions (tmp_list2); | |
1236 | merge_tlist (pbefore_sp, tmp_before, 0); | |
1237 | merge_tlist (pbefore_sp, tmp_list2, 1); | |
1238 | ||
1239 | tmp_list3 = tmp_nosp = 0; | |
1240 | verify_tree (TREE_OPERAND (x, 1), &tmp_list3, &tmp_nosp, NULL_TREE); | |
1241 | warn_for_collisions (tmp_nosp); | |
1242 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
1243 | ||
1244 | tmp_list3 = tmp_list2 = 0; | |
1245 | verify_tree (TREE_OPERAND (x, 2), &tmp_list3, &tmp_list2, NULL_TREE); | |
1246 | warn_for_collisions (tmp_list2); | |
1247 | merge_tlist (pbefore_sp, tmp_list3, 0); | |
1248 | /* Rather than add both tmp_nosp and tmp_list2, we have to merge the | |
1249 | two first, to avoid warning for (a ? b++ : b++). */ | |
1250 | merge_tlist (&tmp_nosp, tmp_list2, 0); | |
1251 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
1252 | return; | |
1253 | ||
481c6ce6 | 1254 | case PREDECREMENT_EXPR: |
1255 | case PREINCREMENT_EXPR: | |
1256 | case POSTDECREMENT_EXPR: | |
1257 | case POSTINCREMENT_EXPR: | |
4e91a871 | 1258 | verify_tree (TREE_OPERAND (x, 0), pno_sp, pno_sp, x); |
1259 | return; | |
1260 | ||
1261 | case MODIFY_EXPR: | |
1262 | tmp_before = tmp_nosp = tmp_list3 = 0; | |
1263 | verify_tree (TREE_OPERAND (x, 1), &tmp_before, &tmp_nosp, NULL_TREE); | |
1264 | verify_tree (TREE_OPERAND (x, 0), &tmp_list3, &tmp_list3, x); | |
1265 | /* Expressions inside the LHS are not ordered wrt. the sequence points | |
1266 | in the RHS. Example: | |
1267 | *a = (a++, 2) | |
1268 | Despite the fact that the modification of "a" is in the before_sp | |
1269 | list (tmp_before), it conflicts with the use of "a" in the LHS. | |
1270 | We can handle this by adding the contents of tmp_list3 | |
1271 | to those of tmp_before, and redoing the collision warnings for that | |
1272 | list. */ | |
1273 | add_tlist (&tmp_before, tmp_list3, x, 1); | |
1274 | warn_for_collisions (tmp_before); | |
1275 | /* Exclude the LHS itself here; we first have to merge it into the | |
1276 | tmp_nosp list. This is done to avoid warning for "a = a"; if we | |
1277 | didn't exclude the LHS, we'd get it twice, once as a read and once | |
1278 | as a write. */ | |
1279 | add_tlist (pno_sp, tmp_list3, x, 0); | |
1280 | warn_for_collisions_1 (TREE_OPERAND (x, 0), x, tmp_nosp, 1); | |
1281 | ||
1282 | merge_tlist (pbefore_sp, tmp_before, 0); | |
1283 | if (warning_candidate_p (TREE_OPERAND (x, 0))) | |
1284 | merge_tlist (&tmp_nosp, new_tlist (NULL, TREE_OPERAND (x, 0), x), 0); | |
1285 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 1); | |
1286 | return; | |
481c6ce6 | 1287 | |
1288 | case CALL_EXPR: | |
4e91a871 | 1289 | /* We need to warn about conflicts among arguments and conflicts between |
1290 | args and the function address. Side effects of the function address, | |
1291 | however, are not ordered by the sequence point of the call. */ | |
1292 | tmp_before = tmp_nosp = tmp_list2 = tmp_list3 = 0; | |
1293 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
1294 | if (TREE_OPERAND (x, 1)) | |
1295 | verify_tree (TREE_OPERAND (x, 1), &tmp_list2, &tmp_list3, NULL_TREE); | |
1296 | merge_tlist (&tmp_list3, tmp_list2, 0); | |
1297 | add_tlist (&tmp_before, tmp_list3, NULL_TREE, 0); | |
1298 | add_tlist (&tmp_before, tmp_nosp, NULL_TREE, 0); | |
1299 | warn_for_collisions (tmp_before); | |
1300 | add_tlist (pbefore_sp, tmp_before, NULL_TREE, 0); | |
1301 | return; | |
481c6ce6 | 1302 | |
1303 | case TREE_LIST: | |
1304 | /* Scan all the list, e.g. indices of multi dimensional array. */ | |
1305 | while (x) | |
1306 | { | |
4e91a871 | 1307 | tmp_before = tmp_nosp = 0; |
1308 | verify_tree (TREE_VALUE (x), &tmp_before, &tmp_nosp, NULL_TREE); | |
1309 | merge_tlist (&tmp_nosp, tmp_before, 0); | |
1310 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
481c6ce6 | 1311 | x = TREE_CHAIN (x); |
1312 | } | |
4e91a871 | 1313 | return; |
481c6ce6 | 1314 | |
4e91a871 | 1315 | case SAVE_EXPR: |
1316 | { | |
1317 | struct tlist_cache *t; | |
1318 | for (t = save_expr_cache; t; t = t->next) | |
1319 | if (t->expr == x) | |
1320 | break; | |
481c6ce6 | 1321 | |
4e91a871 | 1322 | if (! t) |
481c6ce6 | 1323 | { |
9318f22c | 1324 | t = XOBNEW (&tlist_obstack, struct tlist_cache); |
4e91a871 | 1325 | t->next = save_expr_cache; |
1326 | t->expr = x; | |
1327 | save_expr_cache = t; | |
1328 | ||
1329 | tmp_before = tmp_nosp = 0; | |
1330 | verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
1331 | warn_for_collisions (tmp_nosp); | |
1332 | ||
1333 | tmp_list3 = 0; | |
1334 | while (tmp_nosp) | |
1335 | { | |
1336 | struct tlist *t = tmp_nosp; | |
1337 | tmp_nosp = t->next; | |
1338 | merge_tlist (&tmp_list3, t, 0); | |
1339 | } | |
1340 | t->cache_before_sp = tmp_before; | |
1341 | t->cache_after_sp = tmp_list3; | |
481c6ce6 | 1342 | } |
4e91a871 | 1343 | merge_tlist (pbefore_sp, t->cache_before_sp, 1); |
1344 | add_tlist (pno_sp, t->cache_after_sp, NULL_TREE, 1); | |
1345 | return; | |
1346 | } | |
1347 | default: | |
481c6ce6 | 1348 | break; |
1349 | } | |
481c6ce6 | 1350 | |
e916c70c | 1351 | if (cl == '1') |
481c6ce6 | 1352 | { |
4e91a871 | 1353 | if (first_rtl_op (code) == 0) |
1354 | return; | |
1355 | x = TREE_OPERAND (x, 0); | |
1356 | writer = 0; | |
1357 | goto restart; | |
481c6ce6 | 1358 | } |
1359 | ||
e916c70c | 1360 | switch (cl) |
481c6ce6 | 1361 | { |
4e91a871 | 1362 | case 'r': |
1363 | case '<': | |
1364 | case '2': | |
4e91a871 | 1365 | case 'e': |
1366 | case 's': | |
1367 | case 'x': | |
1368 | { | |
1369 | int lp; | |
1370 | int max = first_rtl_op (TREE_CODE (x)); | |
1371 | for (lp = 0; lp < max; lp++) | |
1372 | { | |
1373 | tmp_before = tmp_nosp = 0; | |
1374 | verify_tree (TREE_OPERAND (x, lp), &tmp_before, &tmp_nosp, NULL_TREE); | |
1375 | merge_tlist (&tmp_nosp, tmp_before, 0); | |
1376 | add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
1377 | } | |
1378 | break; | |
1379 | } | |
481c6ce6 | 1380 | } |
481c6ce6 | 1381 | } |
1382 | ||
974e2c0c | 1383 | /* Try to warn for undefined behavior in EXPR due to missing sequence |
481c6ce6 | 1384 | points. */ |
1385 | ||
2569a1be | 1386 | void |
1cae46be | 1387 | verify_sequence_points (tree expr) |
481c6ce6 | 1388 | { |
4e91a871 | 1389 | struct tlist *before_sp = 0, *after_sp = 0; |
481c6ce6 | 1390 | |
4e91a871 | 1391 | warned_ids = 0; |
1392 | save_expr_cache = 0; | |
1393 | if (tlist_firstobj == 0) | |
481c6ce6 | 1394 | { |
4e91a871 | 1395 | gcc_obstack_init (&tlist_obstack); |
4fd61bc6 | 1396 | tlist_firstobj = (char *) obstack_alloc (&tlist_obstack, 0); |
481c6ce6 | 1397 | } |
1398 | ||
4e91a871 | 1399 | verify_tree (expr, &before_sp, &after_sp, 0); |
1400 | warn_for_collisions (after_sp); | |
1401 | obstack_free (&tlist_obstack, tlist_firstobj); | |
481c6ce6 | 1402 | } |
b0fc3e72 | 1403 | \f |
1404 | /* Validate the expression after `case' and apply default promotions. */ | |
1405 | ||
2ca392fd | 1406 | static tree |
1cae46be | 1407 | check_case_value (tree value) |
b0fc3e72 | 1408 | { |
1409 | if (value == NULL_TREE) | |
1410 | return value; | |
1411 | ||
1412 | /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */ | |
fce1d6af | 1413 | STRIP_TYPE_NOPS (value); |
225ec6aa | 1414 | /* In C++, the following is allowed: |
1415 | ||
1416 | const int i = 3; | |
1417 | switch (...) { case i: ... } | |
1418 | ||
1419 | So, we try to reduce the VALUE to a constant that way. */ | |
c0f19401 | 1420 | if (c_dialect_cxx ()) |
225ec6aa | 1421 | { |
1422 | value = decl_constant_value (value); | |
1423 | STRIP_TYPE_NOPS (value); | |
1424 | value = fold (value); | |
1425 | } | |
b0fc3e72 | 1426 | |
1427 | if (TREE_CODE (value) != INTEGER_CST | |
1428 | && value != error_mark_node) | |
1429 | { | |
1430 | error ("case label does not reduce to an integer constant"); | |
1431 | value = error_mark_node; | |
1432 | } | |
1433 | else | |
1434 | /* Promote char or short to int. */ | |
1435 | value = default_conversion (value); | |
1436 | ||
6433f1c2 | 1437 | constant_expression_warning (value); |
1438 | ||
b0fc3e72 | 1439 | return value; |
1440 | } | |
1441 | \f | |
2ca392fd | 1442 | /* See if the case values LOW and HIGH are in the range of the original |
1443 | type (ie. before the default conversion to int) of the switch testing | |
1444 | expression. | |
1445 | TYPE is the promoted type of the testing expression, and ORIG_TYPE is | |
1446 | the type before promiting it. CASE_LOW_P is a pointer to the lower | |
1447 | bound of the case label, and CASE_HIGH_P is the upper bound or NULL | |
1448 | if the case is not a case range. | |
1449 | The caller has to make sure that we are not called with NULL for | |
1450 | CASE_LOW_P (ie. the defualt case). | |
1451 | Returns true if the case label is in range of ORIG_TYPE (satured or | |
1452 | untouched) or false if the label is out of range. */ | |
1453 | ||
1454 | static bool | |
1455 | check_case_bounds (tree type, tree orig_type, | |
1456 | tree *case_low_p, tree *case_high_p) | |
1457 | { | |
1458 | tree min_value, max_value; | |
1459 | tree case_low = *case_low_p; | |
1460 | tree case_high = case_high_p ? *case_high_p : case_low; | |
1461 | ||
1462 | /* If there was a problem with the original type, do nothing. */ | |
1463 | if (orig_type == error_mark_node) | |
1464 | return true; | |
1465 | ||
1466 | min_value = TYPE_MIN_VALUE (orig_type); | |
1467 | max_value = TYPE_MAX_VALUE (orig_type); | |
1468 | ||
1469 | /* Case label is less than minimum for type. */ | |
1470 | if (tree_int_cst_compare (case_low, min_value) < 0 | |
1471 | && tree_int_cst_compare (case_high, min_value) < 0) | |
1472 | { | |
1473 | warning ("case label value is less than minimum value for type"); | |
1474 | return false; | |
1475 | } | |
b27ac6b5 | 1476 | |
2ca392fd | 1477 | /* Case value is greater than maximum for type. */ |
1478 | if (tree_int_cst_compare (case_low, max_value) > 0 | |
1479 | && tree_int_cst_compare (case_high, max_value) > 0) | |
1480 | { | |
1481 | warning ("case label value exceeds maximum value for type"); | |
1482 | return false; | |
1483 | } | |
1484 | ||
1485 | /* Saturate lower case label value to minimum. */ | |
1486 | if (tree_int_cst_compare (case_high, min_value) >= 0 | |
1487 | && tree_int_cst_compare (case_low, min_value) < 0) | |
1488 | { | |
1489 | warning ("lower value in case label range" | |
1490 | " less than minimum value for type"); | |
1491 | case_low = min_value; | |
1492 | } | |
b27ac6b5 | 1493 | |
2ca392fd | 1494 | /* Saturate upper case label value to maximum. */ |
1495 | if (tree_int_cst_compare (case_low, max_value) <= 0 | |
1496 | && tree_int_cst_compare (case_high, max_value) > 0) | |
1497 | { | |
1498 | warning ("upper value in case label range" | |
1499 | " exceeds maximum value for type"); | |
1500 | case_high = max_value; | |
1501 | } | |
1502 | ||
1503 | if (*case_low_p != case_low) | |
1504 | *case_low_p = convert (type, case_low); | |
1505 | if (case_high_p && *case_high_p != case_high) | |
1506 | *case_high_p = convert (type, case_high); | |
1507 | ||
1508 | return true; | |
1509 | } | |
1510 | \f | |
b0fc3e72 | 1511 | /* Return an integer type with BITS bits of precision, |
1512 | that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */ | |
1513 | ||
1514 | tree | |
1cae46be | 1515 | c_common_type_for_size (unsigned int bits, int unsignedp) |
b0fc3e72 | 1516 | { |
46375237 | 1517 | if (bits == TYPE_PRECISION (integer_type_node)) |
1518 | return unsignedp ? unsigned_type_node : integer_type_node; | |
1519 | ||
bacde65a | 1520 | if (bits == TYPE_PRECISION (signed_char_type_node)) |
b0fc3e72 | 1521 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; |
1522 | ||
bacde65a | 1523 | if (bits == TYPE_PRECISION (short_integer_type_node)) |
b0fc3e72 | 1524 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; |
1525 | ||
bacde65a | 1526 | if (bits == TYPE_PRECISION (long_integer_type_node)) |
b0fc3e72 | 1527 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; |
1528 | ||
bacde65a | 1529 | if (bits == TYPE_PRECISION (long_long_integer_type_node)) |
b0fc3e72 | 1530 | return (unsignedp ? long_long_unsigned_type_node |
1531 | : long_long_integer_type_node); | |
1532 | ||
f57fa2ea | 1533 | if (bits == TYPE_PRECISION (widest_integer_literal_type_node)) |
1534 | return (unsignedp ? widest_unsigned_literal_type_node | |
1535 | : widest_integer_literal_type_node); | |
1536 | ||
bacde65a | 1537 | if (bits <= TYPE_PRECISION (intQI_type_node)) |
1538 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; | |
1539 | ||
1540 | if (bits <= TYPE_PRECISION (intHI_type_node)) | |
1541 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; | |
1542 | ||
1543 | if (bits <= TYPE_PRECISION (intSI_type_node)) | |
1544 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; | |
1545 | ||
1546 | if (bits <= TYPE_PRECISION (intDI_type_node)) | |
1547 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; | |
1548 | ||
b0fc3e72 | 1549 | return 0; |
1550 | } | |
1551 | ||
5b247e9f | 1552 | /* Used for communication between c_common_type_for_mode and |
1553 | c_register_builtin_type. */ | |
1554 | static GTY(()) tree registered_builtin_types; | |
1555 | ||
b0fc3e72 | 1556 | /* Return a data type that has machine mode MODE. |
1557 | If the mode is an integer, | |
1558 | then UNSIGNEDP selects between signed and unsigned types. */ | |
1559 | ||
1560 | tree | |
1cae46be | 1561 | c_common_type_for_mode (enum machine_mode mode, int unsignedp) |
b0fc3e72 | 1562 | { |
5b247e9f | 1563 | tree t; |
1564 | ||
46375237 | 1565 | if (mode == TYPE_MODE (integer_type_node)) |
1566 | return unsignedp ? unsigned_type_node : integer_type_node; | |
1567 | ||
b0fc3e72 | 1568 | if (mode == TYPE_MODE (signed_char_type_node)) |
1569 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
1570 | ||
1571 | if (mode == TYPE_MODE (short_integer_type_node)) | |
1572 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
1573 | ||
b0fc3e72 | 1574 | if (mode == TYPE_MODE (long_integer_type_node)) |
1575 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
1576 | ||
1577 | if (mode == TYPE_MODE (long_long_integer_type_node)) | |
1578 | return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node; | |
1579 | ||
f57fa2ea | 1580 | if (mode == TYPE_MODE (widest_integer_literal_type_node)) |
44e9fa65 | 1581 | return unsignedp ? widest_unsigned_literal_type_node |
4ee9c684 | 1582 | : widest_integer_literal_type_node; |
f57fa2ea | 1583 | |
88ae7f04 | 1584 | if (mode == QImode) |
bacde65a | 1585 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; |
1586 | ||
88ae7f04 | 1587 | if (mode == HImode) |
bacde65a | 1588 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; |
1589 | ||
88ae7f04 | 1590 | if (mode == SImode) |
bacde65a | 1591 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; |
1592 | ||
88ae7f04 | 1593 | if (mode == DImode) |
bacde65a | 1594 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; |
1595 | ||
cc1cc1c7 | 1596 | #if HOST_BITS_PER_WIDE_INT >= 64 |
6274009c | 1597 | if (mode == TYPE_MODE (intTI_type_node)) |
1598 | return unsignedp ? unsigned_intTI_type_node : intTI_type_node; | |
cc1cc1c7 | 1599 | #endif |
6274009c | 1600 | |
b0fc3e72 | 1601 | if (mode == TYPE_MODE (float_type_node)) |
1602 | return float_type_node; | |
1603 | ||
1604 | if (mode == TYPE_MODE (double_type_node)) | |
1605 | return double_type_node; | |
1606 | ||
1607 | if (mode == TYPE_MODE (long_double_type_node)) | |
1608 | return long_double_type_node; | |
1609 | ||
545c2bde | 1610 | if (mode == TYPE_MODE (void_type_node)) |
1611 | return void_type_node; | |
b27ac6b5 | 1612 | |
b0fc3e72 | 1613 | if (mode == TYPE_MODE (build_pointer_type (char_type_node))) |
4eed1316 | 1614 | return unsignedp ? make_unsigned_type (mode) : make_signed_type (mode); |
b0fc3e72 | 1615 | |
1616 | if (mode == TYPE_MODE (build_pointer_type (integer_type_node))) | |
4eed1316 | 1617 | return unsignedp ? make_unsigned_type (mode) : make_signed_type (mode); |
b0fc3e72 | 1618 | |
4917c376 | 1619 | if (VECTOR_MODE_P (mode)) |
1620 | { | |
1621 | enum machine_mode inner_mode = GET_MODE_INNER (mode); | |
1622 | tree inner_type = c_common_type_for_mode (inner_mode, unsignedp); | |
1623 | if (inner_type != NULL_TREE) | |
1624 | return build_vector_type_for_mode (inner_type, mode); | |
88ae7f04 | 1625 | } |
e2ea7e3a | 1626 | |
5b247e9f | 1627 | for (t = registered_builtin_types; t; t = TREE_CHAIN (t)) |
1628 | if (TYPE_MODE (TREE_VALUE (t)) == mode) | |
1629 | return TREE_VALUE (t); | |
1630 | ||
b0fc3e72 | 1631 | return 0; |
1632 | } | |
20d39783 | 1633 | |
2c0e001b | 1634 | /* Return an unsigned type the same as TYPE in other respects. */ |
20d39783 | 1635 | tree |
1cae46be | 1636 | c_common_unsigned_type (tree type) |
20d39783 | 1637 | { |
1638 | tree type1 = TYPE_MAIN_VARIANT (type); | |
1639 | if (type1 == signed_char_type_node || type1 == char_type_node) | |
1640 | return unsigned_char_type_node; | |
1641 | if (type1 == integer_type_node) | |
1642 | return unsigned_type_node; | |
1643 | if (type1 == short_integer_type_node) | |
1644 | return short_unsigned_type_node; | |
1645 | if (type1 == long_integer_type_node) | |
1646 | return long_unsigned_type_node; | |
1647 | if (type1 == long_long_integer_type_node) | |
1648 | return long_long_unsigned_type_node; | |
1649 | if (type1 == widest_integer_literal_type_node) | |
1650 | return widest_unsigned_literal_type_node; | |
1651 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
1652 | if (type1 == intTI_type_node) | |
1653 | return unsigned_intTI_type_node; | |
1654 | #endif | |
1655 | if (type1 == intDI_type_node) | |
1656 | return unsigned_intDI_type_node; | |
1657 | if (type1 == intSI_type_node) | |
1658 | return unsigned_intSI_type_node; | |
1659 | if (type1 == intHI_type_node) | |
1660 | return unsigned_intHI_type_node; | |
1661 | if (type1 == intQI_type_node) | |
1662 | return unsigned_intQI_type_node; | |
1663 | ||
4070745f | 1664 | return c_common_signed_or_unsigned_type (1, type); |
20d39783 | 1665 | } |
1666 | ||
1667 | /* Return a signed type the same as TYPE in other respects. */ | |
1668 | ||
1669 | tree | |
1cae46be | 1670 | c_common_signed_type (tree type) |
20d39783 | 1671 | { |
1672 | tree type1 = TYPE_MAIN_VARIANT (type); | |
1673 | if (type1 == unsigned_char_type_node || type1 == char_type_node) | |
1674 | return signed_char_type_node; | |
1675 | if (type1 == unsigned_type_node) | |
1676 | return integer_type_node; | |
1677 | if (type1 == short_unsigned_type_node) | |
1678 | return short_integer_type_node; | |
1679 | if (type1 == long_unsigned_type_node) | |
1680 | return long_integer_type_node; | |
1681 | if (type1 == long_long_unsigned_type_node) | |
1682 | return long_long_integer_type_node; | |
1683 | if (type1 == widest_unsigned_literal_type_node) | |
1684 | return widest_integer_literal_type_node; | |
1685 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
1686 | if (type1 == unsigned_intTI_type_node) | |
1687 | return intTI_type_node; | |
1688 | #endif | |
1689 | if (type1 == unsigned_intDI_type_node) | |
1690 | return intDI_type_node; | |
1691 | if (type1 == unsigned_intSI_type_node) | |
1692 | return intSI_type_node; | |
1693 | if (type1 == unsigned_intHI_type_node) | |
1694 | return intHI_type_node; | |
1695 | if (type1 == unsigned_intQI_type_node) | |
1696 | return intQI_type_node; | |
1697 | ||
4070745f | 1698 | return c_common_signed_or_unsigned_type (0, type); |
20d39783 | 1699 | } |
1700 | ||
1701 | /* Return a type the same as TYPE except unsigned or | |
1702 | signed according to UNSIGNEDP. */ | |
1703 | ||
1704 | tree | |
1cae46be | 1705 | c_common_signed_or_unsigned_type (int unsignedp, tree type) |
20d39783 | 1706 | { |
1707 | if (! INTEGRAL_TYPE_P (type) | |
78a8ed03 | 1708 | || TYPE_UNSIGNED (type) == unsignedp) |
20d39783 | 1709 | return type; |
1710 | ||
4f7f7efd | 1711 | /* For ENUMERAL_TYPEs in C++, must check the mode of the types, not |
1712 | the precision; they have precision set to match their range, but | |
1713 | may use a wider mode to match an ABI. If we change modes, we may | |
1714 | wind up with bad conversions. For INTEGER_TYPEs in C, must check | |
1715 | the precision as well, so as to yield correct results for | |
1716 | bit-field types. C++ does not have these separate bit-field | |
1717 | types, and producing a signed or unsigned variant of an | |
1718 | ENUMERAL_TYPE may cause other problems as well. */ | |
1719 | ||
1720 | #define TYPE_OK(node) \ | |
1721 | (TYPE_MODE (type) == TYPE_MODE (node) \ | |
1722 | && (c_dialect_cxx () || TYPE_PRECISION (type) == TYPE_PRECISION (node))) | |
1723 | if (TYPE_OK (signed_char_type_node)) | |
20d39783 | 1724 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; |
4f7f7efd | 1725 | if (TYPE_OK (integer_type_node)) |
20d39783 | 1726 | return unsignedp ? unsigned_type_node : integer_type_node; |
4f7f7efd | 1727 | if (TYPE_OK (short_integer_type_node)) |
20d39783 | 1728 | return unsignedp ? short_unsigned_type_node : short_integer_type_node; |
4f7f7efd | 1729 | if (TYPE_OK (long_integer_type_node)) |
20d39783 | 1730 | return unsignedp ? long_unsigned_type_node : long_integer_type_node; |
4f7f7efd | 1731 | if (TYPE_OK (long_long_integer_type_node)) |
20d39783 | 1732 | return (unsignedp ? long_long_unsigned_type_node |
1733 | : long_long_integer_type_node); | |
4f7f7efd | 1734 | if (TYPE_OK (widest_integer_literal_type_node)) |
20d39783 | 1735 | return (unsignedp ? widest_unsigned_literal_type_node |
1736 | : widest_integer_literal_type_node); | |
ef11801e | 1737 | |
1738 | #if HOST_BITS_PER_WIDE_INT >= 64 | |
4f7f7efd | 1739 | if (TYPE_OK (intTI_type_node)) |
ef11801e | 1740 | return unsignedp ? unsigned_intTI_type_node : intTI_type_node; |
1741 | #endif | |
4f7f7efd | 1742 | if (TYPE_OK (intDI_type_node)) |
ef11801e | 1743 | return unsignedp ? unsigned_intDI_type_node : intDI_type_node; |
4f7f7efd | 1744 | if (TYPE_OK (intSI_type_node)) |
ef11801e | 1745 | return unsignedp ? unsigned_intSI_type_node : intSI_type_node; |
4f7f7efd | 1746 | if (TYPE_OK (intHI_type_node)) |
ef11801e | 1747 | return unsignedp ? unsigned_intHI_type_node : intHI_type_node; |
4f7f7efd | 1748 | if (TYPE_OK (intQI_type_node)) |
ef11801e | 1749 | return unsignedp ? unsigned_intQI_type_node : intQI_type_node; |
4f7f7efd | 1750 | #undef TYPE_OK |
ef11801e | 1751 | |
4f7f7efd | 1752 | if (c_dialect_cxx ()) |
1753 | return type; | |
1754 | else | |
1755 | return build_nonstandard_integer_type (TYPE_PRECISION (type), unsignedp); | |
20d39783 | 1756 | } |
b268e47e | 1757 | |
1758 | /* The C version of the register_builtin_type langhook. */ | |
1759 | ||
1760 | void | |
1761 | c_register_builtin_type (tree type, const char* name) | |
1762 | { | |
1763 | tree decl; | |
1764 | ||
1765 | decl = build_decl (TYPE_DECL, get_identifier (name), type); | |
1766 | DECL_ARTIFICIAL (decl) = 1; | |
1767 | if (!TYPE_NAME (type)) | |
1768 | TYPE_NAME (type) = decl; | |
1769 | pushdecl (decl); | |
5b247e9f | 1770 | |
1771 | registered_builtin_types = tree_cons (0, type, registered_builtin_types); | |
b268e47e | 1772 | } |
1773 | ||
b0fc3e72 | 1774 | \f |
a9b9d10c | 1775 | /* Return the minimum number of bits needed to represent VALUE in a |
1776 | signed or unsigned type, UNSIGNEDP says which. */ | |
1777 | ||
a0c2c45b | 1778 | unsigned int |
1cae46be | 1779 | min_precision (tree value, int unsignedp) |
a9b9d10c | 1780 | { |
1781 | int log; | |
1782 | ||
1783 | /* If the value is negative, compute its negative minus 1. The latter | |
1784 | adjustment is because the absolute value of the largest negative value | |
1785 | is one larger than the largest positive value. This is equivalent to | |
1786 | a bit-wise negation, so use that operation instead. */ | |
1787 | ||
1788 | if (tree_int_cst_sgn (value) < 0) | |
1789 | value = fold (build1 (BIT_NOT_EXPR, TREE_TYPE (value), value)); | |
1790 | ||
1791 | /* Return the number of bits needed, taking into account the fact | |
1792 | that we need one more bit for a signed than unsigned type. */ | |
1793 | ||
1794 | if (integer_zerop (value)) | |
1795 | log = 0; | |
a9b9d10c | 1796 | else |
a0c2c45b | 1797 | log = tree_floor_log2 (value); |
a9b9d10c | 1798 | |
1799 | return log + 1 + ! unsignedp; | |
1800 | } | |
1801 | \f | |
aff9e656 | 1802 | /* Print an error message for invalid operands to arith operation |
1803 | CODE. NOP_EXPR is used as a special case (see | |
1804 | c_common_truthvalue_conversion). */ | |
b0fc3e72 | 1805 | |
1806 | void | |
1cae46be | 1807 | binary_op_error (enum tree_code code) |
b0fc3e72 | 1808 | { |
19cb6b50 | 1809 | const char *opname; |
f03946e4 | 1810 | |
b0fc3e72 | 1811 | switch (code) |
1812 | { | |
1813 | case NOP_EXPR: | |
1814 | error ("invalid truth-value expression"); | |
1815 | return; | |
1816 | ||
1817 | case PLUS_EXPR: | |
1818 | opname = "+"; break; | |
1819 | case MINUS_EXPR: | |
1820 | opname = "-"; break; | |
1821 | case MULT_EXPR: | |
1822 | opname = "*"; break; | |
1823 | case MAX_EXPR: | |
1824 | opname = "max"; break; | |
1825 | case MIN_EXPR: | |
1826 | opname = "min"; break; | |
1827 | case EQ_EXPR: | |
1828 | opname = "=="; break; | |
1829 | case NE_EXPR: | |
1830 | opname = "!="; break; | |
1831 | case LE_EXPR: | |
1832 | opname = "<="; break; | |
1833 | case GE_EXPR: | |
1834 | opname = ">="; break; | |
1835 | case LT_EXPR: | |
1836 | opname = "<"; break; | |
1837 | case GT_EXPR: | |
1838 | opname = ">"; break; | |
1839 | case LSHIFT_EXPR: | |
1840 | opname = "<<"; break; | |
1841 | case RSHIFT_EXPR: | |
1842 | opname = ">>"; break; | |
1843 | case TRUNC_MOD_EXPR: | |
66618a1e | 1844 | case FLOOR_MOD_EXPR: |
b0fc3e72 | 1845 | opname = "%"; break; |
1846 | case TRUNC_DIV_EXPR: | |
66618a1e | 1847 | case FLOOR_DIV_EXPR: |
b0fc3e72 | 1848 | opname = "/"; break; |
1849 | case BIT_AND_EXPR: | |
1850 | opname = "&"; break; | |
1851 | case BIT_IOR_EXPR: | |
1852 | opname = "|"; break; | |
1853 | case TRUTH_ANDIF_EXPR: | |
1854 | opname = "&&"; break; | |
1855 | case TRUTH_ORIF_EXPR: | |
1856 | opname = "||"; break; | |
1857 | case BIT_XOR_EXPR: | |
1858 | opname = "^"; break; | |
66618a1e | 1859 | case LROTATE_EXPR: |
1860 | case RROTATE_EXPR: | |
1861 | opname = "rotate"; break; | |
31f820d2 | 1862 | default: |
1863 | opname = "unknown"; break; | |
b0fc3e72 | 1864 | } |
1865 | error ("invalid operands to binary %s", opname); | |
1866 | } | |
1867 | \f | |
1868 | /* Subroutine of build_binary_op, used for comparison operations. | |
1869 | See if the operands have both been converted from subword integer types | |
1870 | and, if so, perhaps change them both back to their original type. | |
5b511807 | 1871 | This function is also responsible for converting the two operands |
1872 | to the proper common type for comparison. | |
b0fc3e72 | 1873 | |
1874 | The arguments of this function are all pointers to local variables | |
1875 | of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1, | |
1876 | RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE. | |
1877 | ||
1878 | If this function returns nonzero, it means that the comparison has | |
1879 | a constant value. What this function returns is an expression for | |
1880 | that value. */ | |
1881 | ||
1882 | tree | |
1cae46be | 1883 | shorten_compare (tree *op0_ptr, tree *op1_ptr, tree *restype_ptr, |
1884 | enum tree_code *rescode_ptr) | |
b0fc3e72 | 1885 | { |
19cb6b50 | 1886 | tree type; |
b0fc3e72 | 1887 | tree op0 = *op0_ptr; |
1888 | tree op1 = *op1_ptr; | |
1889 | int unsignedp0, unsignedp1; | |
1890 | int real1, real2; | |
1891 | tree primop0, primop1; | |
1892 | enum tree_code code = *rescode_ptr; | |
1893 | ||
1894 | /* Throw away any conversions to wider types | |
1895 | already present in the operands. */ | |
1896 | ||
1897 | primop0 = get_narrower (op0, &unsignedp0); | |
1898 | primop1 = get_narrower (op1, &unsignedp1); | |
1899 | ||
1900 | /* Handle the case that OP0 does not *contain* a conversion | |
1901 | but it *requires* conversion to FINAL_TYPE. */ | |
1902 | ||
1903 | if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr) | |
78a8ed03 | 1904 | unsignedp0 = TYPE_UNSIGNED (TREE_TYPE (op0)); |
b0fc3e72 | 1905 | if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr) |
78a8ed03 | 1906 | unsignedp1 = TYPE_UNSIGNED (TREE_TYPE (op1)); |
b0fc3e72 | 1907 | |
1908 | /* If one of the operands must be floated, we cannot optimize. */ | |
1909 | real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE; | |
1910 | real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE; | |
1911 | ||
1912 | /* If first arg is constant, swap the args (changing operation | |
2bd278cc | 1913 | so value is preserved), for canonicalization. Don't do this if |
1914 | the second arg is 0. */ | |
b0fc3e72 | 1915 | |
2bd278cc | 1916 | if (TREE_CONSTANT (primop0) |
1917 | && ! integer_zerop (primop1) && ! real_zerop (primop1)) | |
b0fc3e72 | 1918 | { |
19cb6b50 | 1919 | tree tem = primop0; |
1920 | int temi = unsignedp0; | |
b0fc3e72 | 1921 | primop0 = primop1; |
1922 | primop1 = tem; | |
1923 | tem = op0; | |
1924 | op0 = op1; | |
1925 | op1 = tem; | |
1926 | *op0_ptr = op0; | |
1927 | *op1_ptr = op1; | |
1928 | unsignedp0 = unsignedp1; | |
1929 | unsignedp1 = temi; | |
1930 | temi = real1; | |
1931 | real1 = real2; | |
1932 | real2 = temi; | |
1933 | ||
1934 | switch (code) | |
1935 | { | |
1936 | case LT_EXPR: | |
1937 | code = GT_EXPR; | |
1938 | break; | |
1939 | case GT_EXPR: | |
1940 | code = LT_EXPR; | |
1941 | break; | |
1942 | case LE_EXPR: | |
1943 | code = GE_EXPR; | |
1944 | break; | |
1945 | case GE_EXPR: | |
1946 | code = LE_EXPR; | |
1947 | break; | |
31f820d2 | 1948 | default: |
1949 | break; | |
b0fc3e72 | 1950 | } |
1951 | *rescode_ptr = code; | |
1952 | } | |
1953 | ||
1954 | /* If comparing an integer against a constant more bits wide, | |
1955 | maybe we can deduce a value of 1 or 0 independent of the data. | |
1956 | Or else truncate the constant now | |
1957 | rather than extend the variable at run time. | |
1958 | ||
1959 | This is only interesting if the constant is the wider arg. | |
1960 | Also, it is not safe if the constant is unsigned and the | |
1961 | variable arg is signed, since in this case the variable | |
1962 | would be sign-extended and then regarded as unsigned. | |
1963 | Our technique fails in this case because the lowest/highest | |
1964 | possible unsigned results don't follow naturally from the | |
1965 | lowest/highest possible values of the variable operand. | |
1966 | For just EQ_EXPR and NE_EXPR there is another technique that | |
1967 | could be used: see if the constant can be faithfully represented | |
1968 | in the other operand's type, by truncating it and reextending it | |
1969 | and see if that preserves the constant's value. */ | |
1970 | ||
1971 | if (!real1 && !real2 | |
1972 | && TREE_CODE (primop1) == INTEGER_CST | |
1973 | && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)) | |
1974 | { | |
1975 | int min_gt, max_gt, min_lt, max_lt; | |
1976 | tree maxval, minval; | |
1977 | /* 1 if comparison is nominally unsigned. */ | |
78a8ed03 | 1978 | int unsignedp = TYPE_UNSIGNED (*restype_ptr); |
b0fc3e72 | 1979 | tree val; |
1980 | ||
4070745f | 1981 | type = c_common_signed_or_unsigned_type (unsignedp0, |
1982 | TREE_TYPE (primop0)); | |
cda09c61 | 1983 | |
ee1ab431 | 1984 | /* In C, if TYPE is an enumeration, then we need to get its |
3927afe0 | 1985 | min/max values from its underlying integral type, not the |
ee1ab431 | 1986 | enumerated type itself. In C++, TYPE_MAX_VALUE and |
1987 | TYPE_MIN_VALUE have already been set correctly on the | |
1988 | enumeration type. */ | |
1989 | if (!c_dialect_cxx() && TREE_CODE (type) == ENUMERAL_TYPE) | |
771d21fa | 1990 | type = c_common_type_for_size (TYPE_PRECISION (type), unsignedp0); |
b0fc3e72 | 1991 | |
1992 | maxval = TYPE_MAX_VALUE (type); | |
1993 | minval = TYPE_MIN_VALUE (type); | |
1994 | ||
1995 | if (unsignedp && !unsignedp0) | |
4070745f | 1996 | *restype_ptr = c_common_signed_type (*restype_ptr); |
b0fc3e72 | 1997 | |
1998 | if (TREE_TYPE (primop1) != *restype_ptr) | |
18dbec6f | 1999 | { |
2000 | tree tmp = convert (*restype_ptr, primop1); | |
2001 | TREE_OVERFLOW (tmp) = TREE_OVERFLOW (primop1); | |
2002 | TREE_CONSTANT_OVERFLOW (tmp) = TREE_CONSTANT_OVERFLOW (primop1); | |
2003 | primop1 = tmp; | |
2004 | } | |
b0fc3e72 | 2005 | if (type != *restype_ptr) |
2006 | { | |
2007 | minval = convert (*restype_ptr, minval); | |
2008 | maxval = convert (*restype_ptr, maxval); | |
2009 | } | |
2010 | ||
2011 | if (unsignedp && unsignedp0) | |
2012 | { | |
2013 | min_gt = INT_CST_LT_UNSIGNED (primop1, minval); | |
2014 | max_gt = INT_CST_LT_UNSIGNED (primop1, maxval); | |
2015 | min_lt = INT_CST_LT_UNSIGNED (minval, primop1); | |
2016 | max_lt = INT_CST_LT_UNSIGNED (maxval, primop1); | |
2017 | } | |
2018 | else | |
2019 | { | |
2020 | min_gt = INT_CST_LT (primop1, minval); | |
2021 | max_gt = INT_CST_LT (primop1, maxval); | |
2022 | min_lt = INT_CST_LT (minval, primop1); | |
2023 | max_lt = INT_CST_LT (maxval, primop1); | |
2024 | } | |
2025 | ||
2026 | val = 0; | |
2027 | /* This used to be a switch, but Genix compiler can't handle that. */ | |
2028 | if (code == NE_EXPR) | |
2029 | { | |
2030 | if (max_lt || min_gt) | |
3c2239cf | 2031 | val = truthvalue_true_node; |
b0fc3e72 | 2032 | } |
2033 | else if (code == EQ_EXPR) | |
2034 | { | |
2035 | if (max_lt || min_gt) | |
3c2239cf | 2036 | val = truthvalue_false_node; |
b0fc3e72 | 2037 | } |
2038 | else if (code == LT_EXPR) | |
2039 | { | |
2040 | if (max_lt) | |
3c2239cf | 2041 | val = truthvalue_true_node; |
b0fc3e72 | 2042 | if (!min_lt) |
3c2239cf | 2043 | val = truthvalue_false_node; |
b0fc3e72 | 2044 | } |
2045 | else if (code == GT_EXPR) | |
2046 | { | |
2047 | if (min_gt) | |
3c2239cf | 2048 | val = truthvalue_true_node; |
b0fc3e72 | 2049 | if (!max_gt) |
3c2239cf | 2050 | val = truthvalue_false_node; |
b0fc3e72 | 2051 | } |
2052 | else if (code == LE_EXPR) | |
2053 | { | |
2054 | if (!max_gt) | |
3c2239cf | 2055 | val = truthvalue_true_node; |
b0fc3e72 | 2056 | if (min_gt) |
3c2239cf | 2057 | val = truthvalue_false_node; |
b0fc3e72 | 2058 | } |
2059 | else if (code == GE_EXPR) | |
2060 | { | |
2061 | if (!min_lt) | |
3c2239cf | 2062 | val = truthvalue_true_node; |
b0fc3e72 | 2063 | if (max_lt) |
3c2239cf | 2064 | val = truthvalue_false_node; |
b0fc3e72 | 2065 | } |
2066 | ||
2067 | /* If primop0 was sign-extended and unsigned comparison specd, | |
2068 | we did a signed comparison above using the signed type bounds. | |
2069 | But the comparison we output must be unsigned. | |
2070 | ||
2071 | Also, for inequalities, VAL is no good; but if the signed | |
2072 | comparison had *any* fixed result, it follows that the | |
2073 | unsigned comparison just tests the sign in reverse | |
2074 | (positive values are LE, negative ones GE). | |
2075 | So we can generate an unsigned comparison | |
2076 | against an extreme value of the signed type. */ | |
2077 | ||
2078 | if (unsignedp && !unsignedp0) | |
2079 | { | |
2080 | if (val != 0) | |
2081 | switch (code) | |
2082 | { | |
2083 | case LT_EXPR: | |
2084 | case GE_EXPR: | |
2085 | primop1 = TYPE_MIN_VALUE (type); | |
2086 | val = 0; | |
2087 | break; | |
2088 | ||
2089 | case LE_EXPR: | |
2090 | case GT_EXPR: | |
2091 | primop1 = TYPE_MAX_VALUE (type); | |
2092 | val = 0; | |
2093 | break; | |
31f820d2 | 2094 | |
2095 | default: | |
2096 | break; | |
b0fc3e72 | 2097 | } |
4070745f | 2098 | type = c_common_unsigned_type (type); |
b0fc3e72 | 2099 | } |
2100 | ||
fe5f2366 | 2101 | if (TREE_CODE (primop0) != INTEGER_CST) |
b0fc3e72 | 2102 | { |
3c2239cf | 2103 | if (val == truthvalue_false_node) |
9a64a879 | 2104 | warning ("comparison is always false due to limited range of data type"); |
3c2239cf | 2105 | if (val == truthvalue_true_node) |
9a64a879 | 2106 | warning ("comparison is always true due to limited range of data type"); |
b0fc3e72 | 2107 | } |
2108 | ||
2109 | if (val != 0) | |
2110 | { | |
2111 | /* Don't forget to evaluate PRIMOP0 if it has side effects. */ | |
2112 | if (TREE_SIDE_EFFECTS (primop0)) | |
2113 | return build (COMPOUND_EXPR, TREE_TYPE (val), primop0, val); | |
2114 | return val; | |
2115 | } | |
2116 | ||
2117 | /* Value is not predetermined, but do the comparison | |
2118 | in the type of the operand that is not constant. | |
2119 | TYPE is already properly set. */ | |
2120 | } | |
2121 | else if (real1 && real2 | |
2203bd5c | 2122 | && (TYPE_PRECISION (TREE_TYPE (primop0)) |
2123 | == TYPE_PRECISION (TREE_TYPE (primop1)))) | |
b0fc3e72 | 2124 | type = TREE_TYPE (primop0); |
2125 | ||
2126 | /* If args' natural types are both narrower than nominal type | |
2127 | and both extend in the same manner, compare them | |
2128 | in the type of the wider arg. | |
2129 | Otherwise must actually extend both to the nominal | |
2130 | common type lest different ways of extending | |
2131 | alter the result. | |
2132 | (eg, (short)-1 == (unsigned short)-1 should be 0.) */ | |
2133 | ||
2134 | else if (unsignedp0 == unsignedp1 && real1 == real2 | |
2135 | && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr) | |
2136 | && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr)) | |
2137 | { | |
2138 | type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1)); | |
4070745f | 2139 | type = c_common_signed_or_unsigned_type (unsignedp0 |
78a8ed03 | 2140 | || TYPE_UNSIGNED (*restype_ptr), |
4070745f | 2141 | type); |
b0fc3e72 | 2142 | /* Make sure shorter operand is extended the right way |
2143 | to match the longer operand. */ | |
4070745f | 2144 | primop0 |
2145 | = convert (c_common_signed_or_unsigned_type (unsignedp0, | |
2146 | TREE_TYPE (primop0)), | |
2147 | primop0); | |
2148 | primop1 | |
2149 | = convert (c_common_signed_or_unsigned_type (unsignedp1, | |
2150 | TREE_TYPE (primop1)), | |
2151 | primop1); | |
b0fc3e72 | 2152 | } |
2153 | else | |
2154 | { | |
2155 | /* Here we must do the comparison on the nominal type | |
2156 | using the args exactly as we received them. */ | |
2157 | type = *restype_ptr; | |
2158 | primop0 = op0; | |
2159 | primop1 = op1; | |
2160 | ||
2161 | if (!real1 && !real2 && integer_zerop (primop1) | |
78a8ed03 | 2162 | && TYPE_UNSIGNED (*restype_ptr)) |
b0fc3e72 | 2163 | { |
2164 | tree value = 0; | |
2165 | switch (code) | |
2166 | { | |
2167 | case GE_EXPR: | |
2bd278cc | 2168 | /* All unsigned values are >= 0, so we warn if extra warnings |
2169 | are requested. However, if OP0 is a constant that is | |
2170 | >= 0, the signedness of the comparison isn't an issue, | |
2171 | so suppress the warning. */ | |
da99cd78 | 2172 | if (extra_warnings && !in_system_header |
2bd278cc | 2173 | && ! (TREE_CODE (primop0) == INTEGER_CST |
4070745f | 2174 | && ! TREE_OVERFLOW (convert (c_common_signed_type (type), |
2bd278cc | 2175 | primop0)))) |
9a64a879 | 2176 | warning ("comparison of unsigned expression >= 0 is always true"); |
3c2239cf | 2177 | value = truthvalue_true_node; |
b0fc3e72 | 2178 | break; |
2179 | ||
2180 | case LT_EXPR: | |
da99cd78 | 2181 | if (extra_warnings && !in_system_header |
2bd278cc | 2182 | && ! (TREE_CODE (primop0) == INTEGER_CST |
4070745f | 2183 | && ! TREE_OVERFLOW (convert (c_common_signed_type (type), |
2bd278cc | 2184 | primop0)))) |
9a64a879 | 2185 | warning ("comparison of unsigned expression < 0 is always false"); |
3c2239cf | 2186 | value = truthvalue_false_node; |
31f820d2 | 2187 | break; |
2188 | ||
2189 | default: | |
2190 | break; | |
b0fc3e72 | 2191 | } |
2192 | ||
2193 | if (value != 0) | |
2194 | { | |
2195 | /* Don't forget to evaluate PRIMOP0 if it has side effects. */ | |
2196 | if (TREE_SIDE_EFFECTS (primop0)) | |
2197 | return build (COMPOUND_EXPR, TREE_TYPE (value), | |
2198 | primop0, value); | |
2199 | return value; | |
2200 | } | |
2201 | } | |
2202 | } | |
2203 | ||
2204 | *op0_ptr = convert (type, primop0); | |
2205 | *op1_ptr = convert (type, primop1); | |
2206 | ||
3c2239cf | 2207 | *restype_ptr = truthvalue_type_node; |
b0fc3e72 | 2208 | |
2209 | return 0; | |
2210 | } | |
2211 | \f | |
1c26100f | 2212 | /* Return a tree for the sum or difference (RESULTCODE says which) |
2213 | of pointer PTROP and integer INTOP. */ | |
2214 | ||
2215 | tree | |
1cae46be | 2216 | pointer_int_sum (enum tree_code resultcode, tree ptrop, tree intop) |
1c26100f | 2217 | { |
2218 | tree size_exp; | |
2219 | ||
1c26100f | 2220 | /* The result is a pointer of the same type that is being added. */ |
2221 | ||
2222 | tree result_type = TREE_TYPE (ptrop); | |
2223 | ||
2224 | if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE) | |
2225 | { | |
2226 | if (pedantic || warn_pointer_arith) | |
2227 | pedwarn ("pointer of type `void *' used in arithmetic"); | |
2228 | size_exp = integer_one_node; | |
2229 | } | |
2230 | else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE) | |
2231 | { | |
2232 | if (pedantic || warn_pointer_arith) | |
2233 | pedwarn ("pointer to a function used in arithmetic"); | |
2234 | size_exp = integer_one_node; | |
2235 | } | |
2236 | else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) | |
2237 | { | |
2238 | if (pedantic || warn_pointer_arith) | |
2239 | pedwarn ("pointer to member function used in arithmetic"); | |
2240 | size_exp = integer_one_node; | |
2241 | } | |
1c26100f | 2242 | else |
2243 | size_exp = size_in_bytes (TREE_TYPE (result_type)); | |
2244 | ||
2245 | /* If what we are about to multiply by the size of the elements | |
2246 | contains a constant term, apply distributive law | |
2247 | and multiply that constant term separately. | |
2248 | This helps produce common subexpressions. */ | |
2249 | ||
2250 | if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR) | |
2251 | && ! TREE_CONSTANT (intop) | |
2252 | && TREE_CONSTANT (TREE_OPERAND (intop, 1)) | |
2253 | && TREE_CONSTANT (size_exp) | |
2254 | /* If the constant comes from pointer subtraction, | |
2255 | skip this optimization--it would cause an error. */ | |
2256 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE | |
2257 | /* If the constant is unsigned, and smaller than the pointer size, | |
2258 | then we must skip this optimization. This is because it could cause | |
2259 | an overflow error if the constant is negative but INTOP is not. */ | |
78a8ed03 | 2260 | && (! TYPE_UNSIGNED (TREE_TYPE (intop)) |
1c26100f | 2261 | || (TYPE_PRECISION (TREE_TYPE (intop)) |
2262 | == TYPE_PRECISION (TREE_TYPE (ptrop))))) | |
2263 | { | |
2264 | enum tree_code subcode = resultcode; | |
2265 | tree int_type = TREE_TYPE (intop); | |
2266 | if (TREE_CODE (intop) == MINUS_EXPR) | |
2267 | subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR); | |
2268 | /* Convert both subexpression types to the type of intop, | |
2269 | because weird cases involving pointer arithmetic | |
2270 | can result in a sum or difference with different type args. */ | |
2271 | ptrop = build_binary_op (subcode, ptrop, | |
2272 | convert (int_type, TREE_OPERAND (intop, 1)), 1); | |
2273 | intop = convert (int_type, TREE_OPERAND (intop, 0)); | |
2274 | } | |
2275 | ||
2276 | /* Convert the integer argument to a type the same size as sizetype | |
2277 | so the multiply won't overflow spuriously. */ | |
2278 | ||
2279 | if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype) | |
78a8ed03 | 2280 | || TYPE_UNSIGNED (TREE_TYPE (intop)) != TYPE_UNSIGNED (sizetype)) |
1cae46be | 2281 | intop = convert (c_common_type_for_size (TYPE_PRECISION (sizetype), |
78a8ed03 | 2282 | TYPE_UNSIGNED (sizetype)), intop); |
1c26100f | 2283 | |
2284 | /* Replace the integer argument with a suitable product by the object size. | |
2285 | Do this multiplication as signed, then convert to the appropriate | |
2286 | pointer type (actually unsigned integral). */ | |
2287 | ||
2288 | intop = convert (result_type, | |
2289 | build_binary_op (MULT_EXPR, intop, | |
2290 | convert (TREE_TYPE (intop), size_exp), 1)); | |
2291 | ||
2292 | /* Create the sum or difference. */ | |
4ee9c684 | 2293 | return fold (build (resultcode, result_type, ptrop, intop)); |
1c26100f | 2294 | } |
2295 | \f | |
b0fc3e72 | 2296 | /* Prepare expr to be an argument of a TRUTH_NOT_EXPR, |
2297 | or validate its data type for an `if' or `while' statement or ?..: exp. | |
2298 | ||
2299 | This preparation consists of taking the ordinary | |
2300 | representation of an expression expr and producing a valid tree | |
2301 | boolean expression describing whether expr is nonzero. We could | |
3c2239cf | 2302 | simply always do build_binary_op (NE_EXPR, expr, truthvalue_false_node, 1), |
b0fc3e72 | 2303 | but we optimize comparisons, &&, ||, and !. |
2304 | ||
3c2239cf | 2305 | The resulting type should always be `truthvalue_type_node'. */ |
b0fc3e72 | 2306 | |
2307 | tree | |
1cae46be | 2308 | c_common_truthvalue_conversion (tree expr) |
b0fc3e72 | 2309 | { |
baa1f4f5 | 2310 | if (TREE_CODE (expr) == ERROR_MARK) |
2311 | return expr; | |
2312 | ||
ce871053 | 2313 | if (TREE_CODE (expr) == FUNCTION_DECL) |
2314 | expr = build_unary_op (ADDR_EXPR, expr, 0); | |
2315 | ||
b0fc3e72 | 2316 | switch (TREE_CODE (expr)) |
2317 | { | |
318a728f | 2318 | case EQ_EXPR: case NE_EXPR: case UNEQ_EXPR: case LTGT_EXPR: |
e1232ce2 | 2319 | case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR: |
2320 | case UNLE_EXPR: case UNGE_EXPR: case UNLT_EXPR: case UNGT_EXPR: | |
2321 | case ORDERED_EXPR: case UNORDERED_EXPR: | |
b0fc3e72 | 2322 | case TRUTH_ANDIF_EXPR: |
2323 | case TRUTH_ORIF_EXPR: | |
2324 | case TRUTH_AND_EXPR: | |
2325 | case TRUTH_OR_EXPR: | |
31f6e93c | 2326 | case TRUTH_XOR_EXPR: |
7bbc42b5 | 2327 | case TRUTH_NOT_EXPR: |
3c2239cf | 2328 | TREE_TYPE (expr) = truthvalue_type_node; |
8a7e5d0d | 2329 | return expr; |
3e851b85 | 2330 | |
b0fc3e72 | 2331 | case ERROR_MARK: |
2332 | return expr; | |
2333 | ||
2334 | case INTEGER_CST: | |
3c2239cf | 2335 | return integer_zerop (expr) ? truthvalue_false_node : truthvalue_true_node; |
b0fc3e72 | 2336 | |
2337 | case REAL_CST: | |
3c2239cf | 2338 | return real_zerop (expr) ? truthvalue_false_node : truthvalue_true_node; |
b0fc3e72 | 2339 | |
2340 | case ADDR_EXPR: | |
ce871053 | 2341 | { |
2342 | if (TREE_CODE (TREE_OPERAND (expr, 0)) == FUNCTION_DECL | |
2343 | && ! DECL_WEAK (TREE_OPERAND (expr, 0))) | |
2344 | { | |
2345 | /* Common Ada/Pascal programmer's mistake. We always warn | |
2346 | about this since it is so bad. */ | |
2347 | warning ("the address of `%D', will always evaluate as `true'", | |
2348 | TREE_OPERAND (expr, 0)); | |
2349 | return truthvalue_true_node; | |
2350 | } | |
65b5e6a6 | 2351 | |
ce871053 | 2352 | /* If we are taking the address of an external decl, it might be |
2353 | zero if it is weak, so we cannot optimize. */ | |
2354 | if (DECL_P (TREE_OPERAND (expr, 0)) | |
2355 | && DECL_EXTERNAL (TREE_OPERAND (expr, 0))) | |
2356 | break; | |
2357 | ||
2358 | if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 0))) | |
2359 | return build (COMPOUND_EXPR, truthvalue_type_node, | |
2360 | TREE_OPERAND (expr, 0), truthvalue_true_node); | |
2361 | else | |
2362 | return truthvalue_true_node; | |
2363 | } | |
b0fc3e72 | 2364 | |
2203bd5c | 2365 | case COMPLEX_EXPR: |
2ba726d2 | 2366 | return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)) |
95809de4 | 2367 | ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR), |
dc24ddbd | 2368 | lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0)), |
2369 | lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 1)), | |
2203bd5c | 2370 | 0); |
2371 | ||
b0fc3e72 | 2372 | case NEGATE_EXPR: |
2373 | case ABS_EXPR: | |
2374 | case FLOAT_EXPR: | |
d10cfa8d | 2375 | /* These don't change whether an object is nonzero or zero. */ |
dc24ddbd | 2376 | return lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0)); |
b0fc3e72 | 2377 | |
2378 | case LROTATE_EXPR: | |
2379 | case RROTATE_EXPR: | |
d10cfa8d | 2380 | /* These don't change whether an object is zero or nonzero, but |
b0fc3e72 | 2381 | we can't ignore them if their second arg has side-effects. */ |
2382 | if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))) | |
3c2239cf | 2383 | return build (COMPOUND_EXPR, truthvalue_type_node, TREE_OPERAND (expr, 1), |
dc24ddbd | 2384 | lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0))); |
b0fc3e72 | 2385 | else |
dc24ddbd | 2386 | return lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0)); |
73be5127 | 2387 | |
b0fc3e72 | 2388 | case COND_EXPR: |
2389 | /* Distribute the conversion into the arms of a COND_EXPR. */ | |
3c2239cf | 2390 | return fold (build (COND_EXPR, truthvalue_type_node, TREE_OPERAND (expr, 0), |
dc24ddbd | 2391 | lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 1)), |
2392 | lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 2)))); | |
b0fc3e72 | 2393 | |
2394 | case CONVERT_EXPR: | |
2395 | /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE, | |
2396 | since that affects how `default_conversion' will behave. */ | |
2397 | if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE | |
2398 | || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE) | |
2399 | break; | |
b4b174c3 | 2400 | /* Fall through.... */ |
b0fc3e72 | 2401 | case NOP_EXPR: |
2402 | /* If this is widening the argument, we can ignore it. */ | |
2403 | if (TYPE_PRECISION (TREE_TYPE (expr)) | |
2404 | >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0)))) | |
dc24ddbd | 2405 | return lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0)); |
b0fc3e72 | 2406 | break; |
2407 | ||
b0fc3e72 | 2408 | case MINUS_EXPR: |
920d0fb5 | 2409 | /* Perhaps reduce (x - y) != 0 to (x != y). The expressions |
2410 | aren't guaranteed to the be same for modes that can represent | |
2411 | infinity, since if x and y are both +infinity, or both | |
2412 | -infinity, then x - y is not a number. | |
2413 | ||
2414 | Note that this transformation is safe when x or y is NaN. | |
2415 | (x - y) is then NaN, and both (x - y) != 0 and x != y will | |
2416 | be false. */ | |
2417 | if (HONOR_INFINITIES (TYPE_MODE (TREE_TYPE (TREE_OPERAND (expr, 0))))) | |
fe0a0255 | 2418 | break; |
b4b174c3 | 2419 | /* Fall through.... */ |
fe0a0255 | 2420 | case BIT_XOR_EXPR: |
a70adbe5 | 2421 | /* This and MINUS_EXPR can be changed into a comparison of the |
fe0a0255 | 2422 | two objects. */ |
b0fc3e72 | 2423 | if (TREE_TYPE (TREE_OPERAND (expr, 0)) |
2424 | == TREE_TYPE (TREE_OPERAND (expr, 1))) | |
2425 | return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0), | |
2426 | TREE_OPERAND (expr, 1), 1); | |
2427 | return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0), | |
2428 | fold (build1 (NOP_EXPR, | |
2429 | TREE_TYPE (TREE_OPERAND (expr, 0)), | |
2430 | TREE_OPERAND (expr, 1))), 1); | |
16837b18 | 2431 | |
c2edbca4 | 2432 | case BIT_AND_EXPR: |
cc4c7eaf | 2433 | if (integer_onep (TREE_OPERAND (expr, 1)) |
3c2239cf | 2434 | && TREE_TYPE (expr) != truthvalue_type_node) |
cc4c7eaf | 2435 | /* Using convert here would cause infinite recursion. */ |
3c2239cf | 2436 | return build1 (NOP_EXPR, truthvalue_type_node, expr); |
cc4c7eaf | 2437 | break; |
c2edbca4 | 2438 | |
16837b18 | 2439 | case MODIFY_EXPR: |
066f26bf | 2440 | if (warn_parentheses && !TREE_NO_WARNING (expr)) |
16837b18 | 2441 | warning ("suggest parentheses around assignment used as truth value"); |
2442 | break; | |
73be5127 | 2443 | |
31f820d2 | 2444 | default: |
2445 | break; | |
b0fc3e72 | 2446 | } |
2447 | ||
2ba726d2 | 2448 | if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE) |
a0748b7d | 2449 | { |
aff9e656 | 2450 | tree t = save_expr (expr); |
a0748b7d | 2451 | return (build_binary_op |
2452 | ((TREE_SIDE_EFFECTS (expr) | |
2453 | ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR), | |
dc24ddbd | 2454 | lang_hooks.truthvalue_conversion (build_unary_op (REALPART_EXPR, t, 0)), |
2455 | lang_hooks.truthvalue_conversion (build_unary_op (IMAGPART_EXPR, t, 0)), | |
a0748b7d | 2456 | 0)); |
2457 | } | |
2ba726d2 | 2458 | |
b0fc3e72 | 2459 | return build_binary_op (NE_EXPR, expr, integer_zero_node, 1); |
2460 | } | |
2461 | \f | |
e916c70c | 2462 | static tree builtin_function_2 (const char *builtin_name, const char *name, |
2463 | tree builtin_type, tree type, | |
2464 | enum built_in_function function_code, | |
2465 | enum built_in_class cl, int library_name_p, | |
2466 | bool nonansi_p, | |
2467 | tree attrs); | |
0d4238dc | 2468 | |
ceee5ef4 | 2469 | /* Make a variant type in the proper way for C/C++, propagating qualifiers |
2470 | down to the element type of an array. */ | |
2471 | ||
2472 | tree | |
1cae46be | 2473 | c_build_qualified_type (tree type, int type_quals) |
ceee5ef4 | 2474 | { |
e4eabbe4 | 2475 | if (type == error_mark_node) |
2476 | return type; | |
b27ac6b5 | 2477 | |
adfb367f | 2478 | if (TREE_CODE (type) == ARRAY_TYPE) |
2479 | return build_array_type (c_build_qualified_type (TREE_TYPE (type), | |
2480 | type_quals), | |
2481 | TYPE_DOMAIN (type)); | |
2482 | ||
a5b1863e | 2483 | /* A restrict-qualified pointer type must be a pointer to object or |
2484 | incomplete type. Note that the use of POINTER_TYPE_P also allows | |
adfb367f | 2485 | REFERENCE_TYPEs, which is appropriate for C++. */ |
a5b1863e | 2486 | if ((type_quals & TYPE_QUAL_RESTRICT) |
2487 | && (!POINTER_TYPE_P (type) | |
2488 | || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type)))) | |
2489 | { | |
2490 | error ("invalid use of `restrict'"); | |
2491 | type_quals &= ~TYPE_QUAL_RESTRICT; | |
2492 | } | |
2493 | ||
a5b1863e | 2494 | return build_qualified_type (type, type_quals); |
2495 | } | |
2496 | ||
2497 | /* Apply the TYPE_QUALS to the new DECL. */ | |
2498 | ||
2499 | void | |
1cae46be | 2500 | c_apply_type_quals_to_decl (int type_quals, tree decl) |
a5b1863e | 2501 | { |
adfb367f | 2502 | tree type = TREE_TYPE (decl); |
b27ac6b5 | 2503 | |
e4eabbe4 | 2504 | if (type == error_mark_node) |
2505 | return; | |
adfb367f | 2506 | |
2507 | if (((type_quals & TYPE_QUAL_CONST) | |
2508 | || (type && TREE_CODE (type) == REFERENCE_TYPE)) | |
2509 | /* An object declared 'const' is only readonly after it is | |
2510 | initialized. We don't have any way of expressing this currently, | |
2511 | so we need to be conservative and unset TREE_READONLY for types | |
2512 | with constructors. Otherwise aliasing code will ignore stores in | |
2513 | an inline constructor. */ | |
2514 | && !(type && TYPE_NEEDS_CONSTRUCTING (type))) | |
a5b1863e | 2515 | TREE_READONLY (decl) = 1; |
2516 | if (type_quals & TYPE_QUAL_VOLATILE) | |
2517 | { | |
2518 | TREE_SIDE_EFFECTS (decl) = 1; | |
2519 | TREE_THIS_VOLATILE (decl) = 1; | |
2520 | } | |
d91a20bc | 2521 | if (type_quals & TYPE_QUAL_RESTRICT) |
a5b1863e | 2522 | { |
adfb367f | 2523 | while (type && TREE_CODE (type) == ARRAY_TYPE) |
2524 | /* Allow 'restrict' on arrays of pointers. | |
2525 | FIXME currently we just ignore it. */ | |
2526 | type = TREE_TYPE (type); | |
2527 | if (!type | |
2528 | || !POINTER_TYPE_P (type) | |
2529 | || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))) | |
d91a20bc | 2530 | error ("invalid use of `restrict'"); |
adfb367f | 2531 | else if (flag_strict_aliasing && type == TREE_TYPE (decl)) |
ed83aafb | 2532 | /* Indicate we need to make a unique alias set for this pointer. |
2533 | We can't do it here because it might be pointing to an | |
2534 | incomplete type. */ | |
2535 | DECL_POINTER_ALIAS_SET (decl) = -2; | |
a5b1863e | 2536 | } |
2537 | } | |
2538 | ||
4ee9c684 | 2539 | /* Hash function for the problem of multiple type definitions in |
2540 | different files. This must hash all types that will compare | |
2541 | equal via comptypes to the same value. In practice it hashes | |
0bed3869 | 2542 | on some of the simple stuff and leaves the details to comptypes. */ |
4ee9c684 | 2543 | |
2544 | static hashval_t | |
2545 | c_type_hash (const void *p) | |
2546 | { | |
2547 | int i = 0; | |
2548 | int shift, size; | |
2549 | tree t = (tree)p; | |
2550 | tree t2; | |
2551 | switch (TREE_CODE (t)) | |
2552 | { | |
2363ef00 | 2553 | /* For pointers, hash on pointee type plus some swizzling. */ |
2554 | case POINTER_TYPE: | |
2555 | return c_type_hash (TREE_TYPE (t)) ^ 0x3003003; | |
2556 | /* Hash on number of elements and total size. */ | |
2557 | case ENUMERAL_TYPE: | |
2558 | shift = 3; | |
2559 | t2 = TYPE_VALUES (t); | |
2560 | break; | |
2561 | case RECORD_TYPE: | |
2562 | shift = 0; | |
2563 | t2 = TYPE_FIELDS (t); | |
2564 | break; | |
2565 | case QUAL_UNION_TYPE: | |
2566 | shift = 1; | |
2567 | t2 = TYPE_FIELDS (t); | |
2568 | break; | |
2569 | case UNION_TYPE: | |
2570 | shift = 2; | |
2571 | t2 = TYPE_FIELDS (t); | |
2572 | break; | |
2573 | default: | |
2574 | abort (); | |
4ee9c684 | 2575 | } |
2576 | for (; t2; t2 = TREE_CHAIN (t2)) | |
2577 | i++; | |
2578 | size = TREE_INT_CST_LOW (TYPE_SIZE (t)); | |
2579 | return ((size << 24) | (i << shift)); | |
2580 | } | |
2581 | ||
b5ba9f3a | 2582 | /* Return the typed-based alias set for T, which may be an expression |
f7c44134 | 2583 | or a type. Return -1 if we don't do anything special. */ |
b5ba9f3a | 2584 | |
f7c44134 | 2585 | HOST_WIDE_INT |
1cae46be | 2586 | c_common_get_alias_set (tree t) |
b5ba9f3a | 2587 | { |
be4f2de7 | 2588 | tree u; |
4ee9c684 | 2589 | PTR *slot; |
2590 | static htab_t type_hash_table; | |
1cae46be | 2591 | |
be4f2de7 | 2592 | /* Permit type-punning when accessing a union, provided the access |
2593 | is directly through the union. For example, this code does not | |
2594 | permit taking the address of a union member and then storing | |
2595 | through it. Even the type-punning allowed here is a GCC | |
2596 | extension, albeit a common and useful one; the C standard says | |
2597 | that such accesses have implementation-defined behavior. */ | |
2598 | for (u = t; | |
2599 | TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF; | |
2600 | u = TREE_OPERAND (u, 0)) | |
2601 | if (TREE_CODE (u) == COMPONENT_REF | |
2602 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE) | |
2603 | return 0; | |
1e2513d9 | 2604 | |
9fcc3e54 | 2605 | /* That's all the expressions we handle specially. */ |
2606 | if (! TYPE_P (t)) | |
2607 | return -1; | |
2608 | ||
d716ce75 | 2609 | /* The C standard guarantees that any object may be accessed via an |
9fcc3e54 | 2610 | lvalue that has character type. */ |
2611 | if (t == char_type_node | |
2612 | || t == signed_char_type_node | |
2613 | || t == unsigned_char_type_node) | |
f7c44134 | 2614 | return 0; |
a5b1863e | 2615 | |
cb59f969 | 2616 | /* If it has the may_alias attribute, it can alias anything. */ |
9fcc3e54 | 2617 | if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (t))) |
cb59f969 | 2618 | return 0; |
2619 | ||
1607663f | 2620 | /* The C standard specifically allows aliasing between signed and |
2621 | unsigned variants of the same type. We treat the signed | |
2622 | variant as canonical. */ | |
78a8ed03 | 2623 | if (TREE_CODE (t) == INTEGER_TYPE && TYPE_UNSIGNED (t)) |
a8868e19 | 2624 | { |
4070745f | 2625 | tree t1 = c_common_signed_type (t); |
1607663f | 2626 | |
a8868e19 | 2627 | /* t1 == t can happen for boolean nodes which are always unsigned. */ |
2628 | if (t1 != t) | |
2629 | return get_alias_set (t1); | |
2630 | } | |
f7c44134 | 2631 | else if (POINTER_TYPE_P (t)) |
87d2d17e | 2632 | { |
f7c44134 | 2633 | tree t1; |
87d2d17e | 2634 | |
2635 | /* Unfortunately, there is no canonical form of a pointer type. | |
2636 | In particular, if we have `typedef int I', then `int *', and | |
2637 | `I *' are different types. So, we have to pick a canonical | |
2638 | representative. We do this below. | |
44e9fa65 | 2639 | |
40bdc593 | 2640 | Technically, this approach is actually more conservative that |
2641 | it needs to be. In particular, `const int *' and `int *' | |
734c98be | 2642 | should be in different alias sets, according to the C and C++ |
40bdc593 | 2643 | standard, since their types are not the same, and so, |
2644 | technically, an `int **' and `const int **' cannot point at | |
2645 | the same thing. | |
2646 | ||
4ee9c684 | 2647 | But, the standard is wrong. In particular, this code is |
40bdc593 | 2648 | legal C++: |
2649 | ||
2650 | int *ip; | |
2651 | int **ipp = &ip; | |
7a8a972d | 2652 | const int* const* cipp = ipp; |
40bdc593 | 2653 | |
4ee9c684 | 2654 | And, it doesn't make sense for that to be legal unless you |
40bdc593 | 2655 | can dereference IPP and CIPP. So, we ignore cv-qualifiers on |
2656 | the pointed-to types. This issue has been reported to the | |
2657 | C++ committee. */ | |
211f3116 | 2658 | t1 = build_type_no_quals (t); |
f7c44134 | 2659 | if (t1 != t) |
2660 | return get_alias_set (t1); | |
87d2d17e | 2661 | } |
1e2513d9 | 2662 | |
4ee9c684 | 2663 | /* Handle the case of multiple type nodes referring to "the same" type, |
2664 | which occurs with IMA. These share an alias set. FIXME: Currently only | |
2665 | C90 is handled. (In C99 type compatibility is not transitive, which | |
2666 | complicates things mightily. The alias set splay trees can theoretically | |
2667 | represent this, but insertion is tricky when you consider all the | |
2668 | different orders things might arrive in.) */ | |
2669 | ||
2670 | if (c_language != clk_c || flag_isoc99) | |
2671 | return -1; | |
2672 | ||
0bed3869 | 2673 | /* Save time if there's only one input file. */ |
e08bd2f4 | 2674 | if (num_in_fnames == 1) |
4ee9c684 | 2675 | return -1; |
2676 | ||
2677 | /* Pointers need special handling if they point to any type that | |
2678 | needs special handling (below). */ | |
2679 | if (TREE_CODE (t) == POINTER_TYPE) | |
2680 | { | |
2681 | tree t2; | |
2682 | /* Find bottom type under any nested POINTERs. */ | |
b27ac6b5 | 2683 | for (t2 = TREE_TYPE (t); |
4ee9c684 | 2684 | TREE_CODE (t2) == POINTER_TYPE; |
2685 | t2 = TREE_TYPE (t2)) | |
2686 | ; | |
b27ac6b5 | 2687 | if (TREE_CODE (t2) != RECORD_TYPE |
4ee9c684 | 2688 | && TREE_CODE (t2) != ENUMERAL_TYPE |
2689 | && TREE_CODE (t2) != QUAL_UNION_TYPE | |
2690 | && TREE_CODE (t2) != UNION_TYPE) | |
2691 | return -1; | |
2692 | if (TYPE_SIZE (t2) == 0) | |
2693 | return -1; | |
2694 | } | |
2695 | /* These are the only cases that need special handling. */ | |
b27ac6b5 | 2696 | if (TREE_CODE (t) != RECORD_TYPE |
4ee9c684 | 2697 | && TREE_CODE (t) != ENUMERAL_TYPE |
2698 | && TREE_CODE (t) != QUAL_UNION_TYPE | |
2699 | && TREE_CODE (t) != UNION_TYPE | |
2700 | && TREE_CODE (t) != POINTER_TYPE) | |
2701 | return -1; | |
2702 | /* Undefined? */ | |
2703 | if (TYPE_SIZE (t) == 0) | |
2704 | return -1; | |
2705 | ||
b27ac6b5 | 2706 | /* Look up t in hash table. Only one of the compatible types within each |
4ee9c684 | 2707 | alias set is recorded in the table. */ |
2708 | if (!type_hash_table) | |
2709 | type_hash_table = htab_create (1021, c_type_hash, | |
2710 | (htab_eq) lang_hooks.types_compatible_p, | |
2711 | NULL); | |
2712 | slot = htab_find_slot (type_hash_table, t, INSERT); | |
2713 | if (*slot != NULL) | |
2714 | return TYPE_ALIAS_SET ((tree)*slot); | |
2715 | else | |
2716 | /* Our caller will assign and record (in t) a new alias set; all we need | |
2717 | to do is remember t in the hash table. */ | |
2718 | *slot = t; | |
2719 | ||
f7c44134 | 2720 | return -1; |
b5ba9f3a | 2721 | } |
902b4e01 | 2722 | \f |
d4c4d95c | 2723 | /* Compute the value of 'sizeof (TYPE)' or '__alignof__ (TYPE)', where the |
d3a4d008 | 2724 | second parameter indicates which OPERATOR is being applied. The COMPLAIN |
2725 | flag controls whether we should diagnose possibly ill-formed | |
2726 | constructs or not. */ | |
902b4e01 | 2727 | tree |
1cae46be | 2728 | c_sizeof_or_alignof_type (tree type, enum tree_code op, int complain) |
902b4e01 | 2729 | { |
d4c4d95c | 2730 | const char *op_name; |
2731 | tree value = NULL; | |
2732 | enum tree_code type_code = TREE_CODE (type); | |
1cae46be | 2733 | |
d4c4d95c | 2734 | my_friendly_assert (op == SIZEOF_EXPR || op == ALIGNOF_EXPR, 20020720); |
2735 | op_name = op == SIZEOF_EXPR ? "sizeof" : "__alignof__"; | |
1cae46be | 2736 | |
d4c4d95c | 2737 | if (type_code == FUNCTION_TYPE) |
902b4e01 | 2738 | { |
d4c4d95c | 2739 | if (op == SIZEOF_EXPR) |
2740 | { | |
d3a4d008 | 2741 | if (complain && (pedantic || warn_pointer_arith)) |
d4c4d95c | 2742 | pedwarn ("invalid application of `sizeof' to a function type"); |
2743 | value = size_one_node; | |
2744 | } | |
2745 | else | |
2746 | value = size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT); | |
2747 | } | |
2748 | else if (type_code == VOID_TYPE || type_code == ERROR_MARK) | |
2749 | { | |
1cae46be | 2750 | if (type_code == VOID_TYPE |
d3a4d008 | 2751 | && complain && (pedantic || warn_pointer_arith)) |
d4c4d95c | 2752 | pedwarn ("invalid application of `%s' to a void type", op_name); |
2753 | value = size_one_node; | |
902b4e01 | 2754 | } |
902b4e01 | 2755 | else if (!COMPLETE_TYPE_P (type)) |
2756 | { | |
d3a4d008 | 2757 | if (complain) |
b27ac6b5 | 2758 | error ("invalid application of `%s' to incomplete type `%T' ", |
3ad0e8cc | 2759 | op_name, type); |
d4c4d95c | 2760 | value = size_zero_node; |
902b4e01 | 2761 | } |
2762 | else | |
d4c4d95c | 2763 | { |
4fd61bc6 | 2764 | if (op == (enum tree_code) SIZEOF_EXPR) |
d4c4d95c | 2765 | /* Convert in case a char is more than one unit. */ |
2766 | value = size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type), | |
2767 | size_int (TYPE_PRECISION (char_type_node) | |
2768 | / BITS_PER_UNIT)); | |
2769 | else | |
2770 | value = size_int (TYPE_ALIGN (type) / BITS_PER_UNIT); | |
2771 | } | |
902b4e01 | 2772 | |
d4c4d95c | 2773 | /* VALUE will have an integer type with TYPE_IS_SIZETYPE set. |
2774 | TYPE_IS_SIZETYPE means that certain things (like overflow) will | |
2775 | never happen. However, this node should really have type | |
2776 | `size_t', which is just a typedef for an ordinary integer type. */ | |
654ef926 | 2777 | value = fold (build1 (NOP_EXPR, size_type_node, value)); |
d4c4d95c | 2778 | my_friendly_assert (!TYPE_IS_SIZETYPE (TREE_TYPE (value)), 20001021); |
1cae46be | 2779 | |
d4c4d95c | 2780 | return value; |
902b4e01 | 2781 | } |
2782 | ||
2783 | /* Implement the __alignof keyword: Return the minimum required | |
2784 | alignment of EXPR, measured in bytes. For VAR_DECL's and | |
2785 | FIELD_DECL's return DECL_ALIGN (which can be set from an | |
2786 | "aligned" __attribute__ specification). */ | |
72040e7e | 2787 | |
902b4e01 | 2788 | tree |
1cae46be | 2789 | c_alignof_expr (tree expr) |
902b4e01 | 2790 | { |
2791 | tree t; | |
2792 | ||
2793 | if (TREE_CODE (expr) == VAR_DECL) | |
2794 | t = size_int (DECL_ALIGN (expr) / BITS_PER_UNIT); | |
1cae46be | 2795 | |
902b4e01 | 2796 | else if (TREE_CODE (expr) == COMPONENT_REF |
2797 | && DECL_C_BIT_FIELD (TREE_OPERAND (expr, 1))) | |
2798 | { | |
2799 | error ("`__alignof' applied to a bit-field"); | |
2800 | t = size_one_node; | |
2801 | } | |
2802 | else if (TREE_CODE (expr) == COMPONENT_REF | |
7cc7e163 | 2803 | && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL) |
902b4e01 | 2804 | t = size_int (DECL_ALIGN (TREE_OPERAND (expr, 1)) / BITS_PER_UNIT); |
1cae46be | 2805 | |
902b4e01 | 2806 | else if (TREE_CODE (expr) == INDIRECT_REF) |
2807 | { | |
2808 | tree t = TREE_OPERAND (expr, 0); | |
2809 | tree best = t; | |
2810 | int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
1cae46be | 2811 | |
902b4e01 | 2812 | while (TREE_CODE (t) == NOP_EXPR |
7cc7e163 | 2813 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE) |
902b4e01 | 2814 | { |
2815 | int thisalign; | |
2816 | ||
2817 | t = TREE_OPERAND (t, 0); | |
2818 | thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
2819 | if (thisalign > bestalign) | |
2820 | best = t, bestalign = thisalign; | |
2821 | } | |
2822 | return c_alignof (TREE_TYPE (TREE_TYPE (best))); | |
2823 | } | |
2824 | else | |
2825 | return c_alignof (TREE_TYPE (expr)); | |
2826 | ||
654ef926 | 2827 | return fold (build1 (NOP_EXPR, size_type_node, t)); |
902b4e01 | 2828 | } |
2829 | \f | |
8fe4a266 | 2830 | /* Handle C and C++ default attributes. */ |
2831 | ||
2832 | enum built_in_attribute | |
2833 | { | |
2834 | #define DEF_ATTR_NULL_TREE(ENUM) ENUM, | |
2835 | #define DEF_ATTR_INT(ENUM, VALUE) ENUM, | |
2836 | #define DEF_ATTR_IDENT(ENUM, STRING) ENUM, | |
2837 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM, | |
8fe4a266 | 2838 | #include "builtin-attrs.def" |
2839 | #undef DEF_ATTR_NULL_TREE | |
2840 | #undef DEF_ATTR_INT | |
2841 | #undef DEF_ATTR_IDENT | |
2842 | #undef DEF_ATTR_TREE_LIST | |
8fe4a266 | 2843 | ATTR_LAST |
2844 | }; | |
2845 | ||
2846 | static GTY(()) tree built_in_attributes[(int) ATTR_LAST]; | |
2847 | ||
1cae46be | 2848 | static void c_init_attributes (void); |
8fe4a266 | 2849 | |
72040e7e | 2850 | /* Build tree nodes and builtin functions common to both C and C++ language |
0270ae90 | 2851 | frontends. */ |
f7c44134 | 2852 | |
72040e7e | 2853 | void |
1cae46be | 2854 | c_common_nodes_and_builtins (void) |
72040e7e | 2855 | { |
1cae46be | 2856 | enum builtin_type |
d2d4bdde | 2857 | { |
2858 | #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME, | |
2859 | #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME, | |
2860 | #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME, | |
2861 | #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME, | |
2862 | #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
2863 | #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
2864 | #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME, | |
2865 | #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME, | |
2866 | #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME, | |
03901330 | 2867 | #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, |
d2d4bdde | 2868 | #define DEF_POINTER_TYPE(NAME, TYPE) NAME, |
2869 | #include "builtin-types.def" | |
2870 | #undef DEF_PRIMITIVE_TYPE | |
2871 | #undef DEF_FUNCTION_TYPE_0 | |
2872 | #undef DEF_FUNCTION_TYPE_1 | |
2873 | #undef DEF_FUNCTION_TYPE_2 | |
2874 | #undef DEF_FUNCTION_TYPE_3 | |
2875 | #undef DEF_FUNCTION_TYPE_4 | |
2876 | #undef DEF_FUNCTION_TYPE_VAR_0 | |
2877 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
2878 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
03901330 | 2879 | #undef DEF_FUNCTION_TYPE_VAR_3 |
d2d4bdde | 2880 | #undef DEF_POINTER_TYPE |
2881 | BT_LAST | |
2882 | }; | |
2883 | ||
2884 | typedef enum builtin_type builtin_type; | |
2885 | ||
7cc7e163 | 2886 | tree builtin_types[(int) BT_LAST]; |
174fcc61 | 2887 | int wchar_type_size; |
2888 | tree array_domain_type; | |
2d47cc32 | 2889 | tree va_list_ref_type_node; |
8a15c04a | 2890 | tree va_list_arg_type_node; |
a66c9326 | 2891 | |
174fcc61 | 2892 | /* Define `int' and `char' first so that dbx will output them first. */ |
d946ea19 | 2893 | record_builtin_type (RID_INT, NULL, integer_type_node); |
174fcc61 | 2894 | record_builtin_type (RID_CHAR, "char", char_type_node); |
2895 | ||
2896 | /* `signed' is the same as `int'. FIXME: the declarations of "signed", | |
2897 | "unsigned long", "long long unsigned" and "unsigned short" were in C++ | |
2898 | but not C. Are the conditionals here needed? */ | |
c0f19401 | 2899 | if (c_dialect_cxx ()) |
d946ea19 | 2900 | record_builtin_type (RID_SIGNED, NULL, integer_type_node); |
174fcc61 | 2901 | record_builtin_type (RID_LONG, "long int", long_integer_type_node); |
2902 | record_builtin_type (RID_UNSIGNED, "unsigned int", unsigned_type_node); | |
2903 | record_builtin_type (RID_MAX, "long unsigned int", | |
2904 | long_unsigned_type_node); | |
c0f19401 | 2905 | if (c_dialect_cxx ()) |
174fcc61 | 2906 | record_builtin_type (RID_MAX, "unsigned long", long_unsigned_type_node); |
2907 | record_builtin_type (RID_MAX, "long long int", | |
2908 | long_long_integer_type_node); | |
2909 | record_builtin_type (RID_MAX, "long long unsigned int", | |
2910 | long_long_unsigned_type_node); | |
c0f19401 | 2911 | if (c_dialect_cxx ()) |
174fcc61 | 2912 | record_builtin_type (RID_MAX, "long long unsigned", |
2913 | long_long_unsigned_type_node); | |
2914 | record_builtin_type (RID_SHORT, "short int", short_integer_type_node); | |
2915 | record_builtin_type (RID_MAX, "short unsigned int", | |
2916 | short_unsigned_type_node); | |
c0f19401 | 2917 | if (c_dialect_cxx ()) |
174fcc61 | 2918 | record_builtin_type (RID_MAX, "unsigned short", |
2919 | short_unsigned_type_node); | |
2920 | ||
2921 | /* Define both `signed char' and `unsigned char'. */ | |
2922 | record_builtin_type (RID_MAX, "signed char", signed_char_type_node); | |
2923 | record_builtin_type (RID_MAX, "unsigned char", unsigned_char_type_node); | |
2924 | ||
771d21fa | 2925 | /* These are types that c_common_type_for_size and |
2926 | c_common_type_for_mode use. */ | |
dc24ddbd | 2927 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
2928 | intQI_type_node)); | |
2929 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
2930 | intHI_type_node)); | |
2931 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
2932 | intSI_type_node)); | |
2933 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
2934 | intDI_type_node)); | |
174fcc61 | 2935 | #if HOST_BITS_PER_WIDE_INT >= 64 |
dc24ddbd | 2936 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, |
2937 | get_identifier ("__int128_t"), | |
2938 | intTI_type_node)); | |
174fcc61 | 2939 | #endif |
dc24ddbd | 2940 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
2941 | unsigned_intQI_type_node)); | |
2942 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
2943 | unsigned_intHI_type_node)); | |
2944 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
2945 | unsigned_intSI_type_node)); | |
2946 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, | |
2947 | unsigned_intDI_type_node)); | |
174fcc61 | 2948 | #if HOST_BITS_PER_WIDE_INT >= 64 |
dc24ddbd | 2949 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, |
2950 | get_identifier ("__uint128_t"), | |
2951 | unsigned_intTI_type_node)); | |
174fcc61 | 2952 | #endif |
2953 | ||
2954 | /* Create the widest literal types. */ | |
2955 | widest_integer_literal_type_node | |
2956 | = make_signed_type (HOST_BITS_PER_WIDE_INT * 2); | |
dc24ddbd | 2957 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
2958 | widest_integer_literal_type_node)); | |
174fcc61 | 2959 | |
2960 | widest_unsigned_literal_type_node | |
2961 | = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2); | |
dc24ddbd | 2962 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE, |
2963 | widest_unsigned_literal_type_node)); | |
174fcc61 | 2964 | |
2965 | /* `unsigned long' is the standard type for sizeof. | |
2966 | Note that stddef.h uses `unsigned long', | |
2967 | and this must agree, even if long and int are the same size. */ | |
654ef926 | 2968 | size_type_node = |
174fcc61 | 2969 | TREE_TYPE (identifier_global_value (get_identifier (SIZE_TYPE))); |
654ef926 | 2970 | signed_size_type_node = c_common_signed_type (size_type_node); |
2971 | set_sizetype (size_type_node); | |
174fcc61 | 2972 | |
73673831 | 2973 | pid_type_node = |
2974 | TREE_TYPE (identifier_global_value (get_identifier (PID_TYPE))); | |
2975 | ||
174fcc61 | 2976 | build_common_tree_nodes_2 (flag_short_double); |
2977 | ||
d946ea19 | 2978 | record_builtin_type (RID_FLOAT, NULL, float_type_node); |
2979 | record_builtin_type (RID_DOUBLE, NULL, double_type_node); | |
174fcc61 | 2980 | record_builtin_type (RID_MAX, "long double", long_double_type_node); |
2981 | ||
dc24ddbd | 2982 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, |
2983 | get_identifier ("complex int"), | |
2984 | complex_integer_type_node)); | |
2985 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
2986 | get_identifier ("complex float"), | |
2987 | complex_float_type_node)); | |
2988 | lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, | |
2989 | get_identifier ("complex double"), | |
2990 | complex_double_type_node)); | |
2991 | lang_hooks.decls.pushdecl | |
20325f61 | 2992 | (build_decl (TYPE_DECL, get_identifier ("complex long double"), |
2993 | complex_long_double_type_node)); | |
174fcc61 | 2994 | |
e256d445 | 2995 | if (c_dialect_cxx ()) |
2996 | /* For C++, make fileptr_type_node a distinct void * type until | |
2997 | FILE type is defined. */ | |
2998 | fileptr_type_node = build_type_copy (ptr_type_node); | |
2999 | ||
d946ea19 | 3000 | record_builtin_type (RID_VOID, NULL, void_type_node); |
174fcc61 | 3001 | |
d2d4bdde | 3002 | void_zero_node = build_int_2 (0, 0); |
3003 | TREE_TYPE (void_zero_node) = void_type_node; | |
3004 | ||
174fcc61 | 3005 | void_list_node = build_void_list_node (); |
3006 | ||
3007 | /* Make a type to be the domain of a few array types | |
3008 | whose domains don't really matter. | |
3009 | 200 is small enough that it always fits in size_t | |
3010 | and large enough that it can hold most function names for the | |
3011 | initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */ | |
3012 | array_domain_type = build_index_type (size_int (200)); | |
3013 | ||
3014 | /* Make a type for arrays of characters. | |
3015 | With luck nothing will ever really depend on the length of this | |
3016 | array type. */ | |
3017 | char_array_type_node | |
3018 | = build_array_type (char_type_node, array_domain_type); | |
3019 | ||
3020 | /* Likewise for arrays of ints. */ | |
3021 | int_array_type_node | |
3022 | = build_array_type (integer_type_node, array_domain_type); | |
3023 | ||
d2d4bdde | 3024 | string_type_node = build_pointer_type (char_type_node); |
3025 | const_string_type_node | |
3026 | = build_pointer_type (build_qualified_type | |
3027 | (char_type_node, TYPE_QUAL_CONST)); | |
3028 | ||
174fcc61 | 3029 | /* This is special for C++ so functions can be overloaded. */ |
18ef7ac2 | 3030 | wchar_type_node = get_identifier (MODIFIED_WCHAR_TYPE); |
174fcc61 | 3031 | wchar_type_node = TREE_TYPE (identifier_global_value (wchar_type_node)); |
3032 | wchar_type_size = TYPE_PRECISION (wchar_type_node); | |
c0f19401 | 3033 | if (c_dialect_cxx ()) |
174fcc61 | 3034 | { |
78a8ed03 | 3035 | if (TYPE_UNSIGNED (wchar_type_node)) |
174fcc61 | 3036 | wchar_type_node = make_unsigned_type (wchar_type_size); |
3037 | else | |
3038 | wchar_type_node = make_signed_type (wchar_type_size); | |
3039 | record_builtin_type (RID_WCHAR, "wchar_t", wchar_type_node); | |
3040 | } | |
3041 | else | |
3042 | { | |
4070745f | 3043 | signed_wchar_type_node = c_common_signed_type (wchar_type_node); |
3044 | unsigned_wchar_type_node = c_common_unsigned_type (wchar_type_node); | |
174fcc61 | 3045 | } |
3046 | ||
3047 | /* This is for wide string constants. */ | |
3048 | wchar_array_type_node | |
3049 | = build_array_type (wchar_type_node, array_domain_type); | |
3050 | ||
6bf5ed8d | 3051 | wint_type_node = |
3052 | TREE_TYPE (identifier_global_value (get_identifier (WINT_TYPE))); | |
3053 | ||
3054 | intmax_type_node = | |
3055 | TREE_TYPE (identifier_global_value (get_identifier (INTMAX_TYPE))); | |
3056 | uintmax_type_node = | |
3057 | TREE_TYPE (identifier_global_value (get_identifier (UINTMAX_TYPE))); | |
3058 | ||
3059 | default_function_type = build_function_type (integer_type_node, NULL_TREE); | |
3060 | ptrdiff_type_node | |
3061 | = TREE_TYPE (identifier_global_value (get_identifier (PTRDIFF_TYPE))); | |
4070745f | 3062 | unsigned_ptrdiff_type_node = c_common_unsigned_type (ptrdiff_type_node); |
6bf5ed8d | 3063 | |
dc24ddbd | 3064 | lang_hooks.decls.pushdecl |
20325f61 | 3065 | (build_decl (TYPE_DECL, get_identifier ("__builtin_va_list"), |
3066 | va_list_type_node)); | |
8a15c04a | 3067 | |
8a15c04a | 3068 | if (TREE_CODE (va_list_type_node) == ARRAY_TYPE) |
2d47cc32 | 3069 | { |
3070 | va_list_arg_type_node = va_list_ref_type_node = | |
3071 | build_pointer_type (TREE_TYPE (va_list_type_node)); | |
3072 | } | |
8a15c04a | 3073 | else |
2d47cc32 | 3074 | { |
3075 | va_list_arg_type_node = va_list_type_node; | |
3076 | va_list_ref_type_node = build_reference_type (va_list_type_node); | |
3077 | } | |
1cae46be | 3078 | |
d2d4bdde | 3079 | #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \ |
3080 | builtin_types[(int) ENUM] = VALUE; | |
3081 | #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \ | |
3082 | builtin_types[(int) ENUM] \ | |
3083 | = build_function_type (builtin_types[(int) RETURN], \ | |
3084 | void_list_node); | |
3085 | #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \ | |
3086 | builtin_types[(int) ENUM] \ | |
3087 | = build_function_type (builtin_types[(int) RETURN], \ | |
3088 | tree_cons (NULL_TREE, \ | |
3089 | builtin_types[(int) ARG1], \ | |
3090 | void_list_node)); | |
3091 | #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \ | |
3092 | builtin_types[(int) ENUM] \ | |
1cae46be | 3093 | = build_function_type \ |
d2d4bdde | 3094 | (builtin_types[(int) RETURN], \ |
3095 | tree_cons (NULL_TREE, \ | |
3096 | builtin_types[(int) ARG1], \ | |
3097 | tree_cons (NULL_TREE, \ | |
3098 | builtin_types[(int) ARG2], \ | |
3099 | void_list_node))); | |
3100 | #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
3101 | builtin_types[(int) ENUM] \ | |
3102 | = build_function_type \ | |
3103 | (builtin_types[(int) RETURN], \ | |
3104 | tree_cons (NULL_TREE, \ | |
3105 | builtin_types[(int) ARG1], \ | |
3106 | tree_cons (NULL_TREE, \ | |
3107 | builtin_types[(int) ARG2], \ | |
3108 | tree_cons (NULL_TREE, \ | |
3109 | builtin_types[(int) ARG3], \ | |
3110 | void_list_node)))); | |
3111 | #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
3112 | builtin_types[(int) ENUM] \ | |
3113 | = build_function_type \ | |
3114 | (builtin_types[(int) RETURN], \ | |
3115 | tree_cons (NULL_TREE, \ | |
3116 | builtin_types[(int) ARG1], \ | |
3117 | tree_cons (NULL_TREE, \ | |
3118 | builtin_types[(int) ARG2], \ | |
1cae46be | 3119 | tree_cons \ |
d2d4bdde | 3120 | (NULL_TREE, \ |
1cae46be | 3121 | builtin_types[(int) ARG3], \ |
d2d4bdde | 3122 | tree_cons (NULL_TREE, \ |
3123 | builtin_types[(int) ARG4], \ | |
3124 | void_list_node))))); | |
3125 | #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \ | |
3126 | builtin_types[(int) ENUM] \ | |
3127 | = build_function_type (builtin_types[(int) RETURN], NULL_TREE); | |
3128 | #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \ | |
3129 | builtin_types[(int) ENUM] \ | |
1cae46be | 3130 | = build_function_type (builtin_types[(int) RETURN], \ |
d2d4bdde | 3131 | tree_cons (NULL_TREE, \ |
3132 | builtin_types[(int) ARG1], \ | |
3311f67b | 3133 | NULL_TREE)); |
3134 | ||
d2d4bdde | 3135 | #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \ |
3136 | builtin_types[(int) ENUM] \ | |
1cae46be | 3137 | = build_function_type \ |
d2d4bdde | 3138 | (builtin_types[(int) RETURN], \ |
3139 | tree_cons (NULL_TREE, \ | |
3140 | builtin_types[(int) ARG1], \ | |
3141 | tree_cons (NULL_TREE, \ | |
3142 | builtin_types[(int) ARG2], \ | |
3143 | NULL_TREE))); | |
03901330 | 3144 | |
3145 | #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
3146 | builtin_types[(int) ENUM] \ | |
1cae46be | 3147 | = build_function_type \ |
03901330 | 3148 | (builtin_types[(int) RETURN], \ |
3149 | tree_cons (NULL_TREE, \ | |
3150 | builtin_types[(int) ARG1], \ | |
3151 | tree_cons (NULL_TREE, \ | |
3152 | builtin_types[(int) ARG2], \ | |
3153 | tree_cons (NULL_TREE, \ | |
3154 | builtin_types[(int) ARG3], \ | |
3155 | NULL_TREE)))); | |
3156 | ||
d2d4bdde | 3157 | #define DEF_POINTER_TYPE(ENUM, TYPE) \ |
3158 | builtin_types[(int) ENUM] \ | |
3159 | = build_pointer_type (builtin_types[(int) TYPE]); | |
3160 | #include "builtin-types.def" | |
3161 | #undef DEF_PRIMITIVE_TYPE | |
3162 | #undef DEF_FUNCTION_TYPE_1 | |
3163 | #undef DEF_FUNCTION_TYPE_2 | |
3164 | #undef DEF_FUNCTION_TYPE_3 | |
3165 | #undef DEF_FUNCTION_TYPE_4 | |
3166 | #undef DEF_FUNCTION_TYPE_VAR_0 | |
3167 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
03901330 | 3168 | #undef DEF_FUNCTION_TYPE_VAR_2 |
3169 | #undef DEF_FUNCTION_TYPE_VAR_3 | |
d2d4bdde | 3170 | #undef DEF_POINTER_TYPE |
3171 | ||
101cc430 | 3172 | c_init_attributes (); |
8fe4a266 | 3173 | |
3174 | #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, \ | |
0a68165a | 3175 | BOTH_P, FALLBACK_P, NONANSI_P, ATTRS, IMPLICIT) \ |
d2d4bdde | 3176 | if (NAME) \ |
3177 | { \ | |
3178 | tree decl; \ | |
3179 | \ | |
3180 | if (strncmp (NAME, "__builtin_", strlen ("__builtin_")) != 0) \ | |
3181 | abort (); \ | |
3182 | \ | |
3183 | if (!BOTH_P) \ | |
e60d3615 | 3184 | decl = lang_hooks.builtin_function (NAME, builtin_types[TYPE], \ |
3185 | ENUM, \ | |
d2d4bdde | 3186 | CLASS, \ |
3187 | (FALLBACK_P \ | |
3188 | ? (NAME + strlen ("__builtin_")) \ | |
8fe4a266 | 3189 | : NULL), \ |
3190 | built_in_attributes[(int) ATTRS]); \ | |
d2d4bdde | 3191 | else \ |
3192 | decl = builtin_function_2 (NAME, \ | |
3193 | NAME + strlen ("__builtin_"), \ | |
3194 | builtin_types[TYPE], \ | |
3195 | builtin_types[LIBTYPE], \ | |
3196 | ENUM, \ | |
3197 | CLASS, \ | |
3198 | FALLBACK_P, \ | |
3199 | NONANSI_P, \ | |
8fe4a266 | 3200 | built_in_attributes[(int) ATTRS]); \ |
d2d4bdde | 3201 | \ |
3202 | built_in_decls[(int) ENUM] = decl; \ | |
0a68165a | 3203 | if (IMPLICIT) \ |
4ee9c684 | 3204 | implicit_built_in_decls[(int) ENUM] = decl; \ |
1cae46be | 3205 | } |
d2d4bdde | 3206 | #include "builtins.def" |
3207 | #undef DEF_BUILTIN | |
df4b504c | 3208 | |
883b2e73 | 3209 | targetm.init_builtins (); |
b55af61c | 3210 | if (flag_mudflap) |
3211 | mudflap_init (); | |
ffa8918b | 3212 | |
5c62f199 | 3213 | main_identifier_node = get_identifier ("main"); |
72040e7e | 3214 | } |
a66c9326 | 3215 | |
3216 | tree | |
1cae46be | 3217 | build_va_arg (tree expr, tree type) |
a66c9326 | 3218 | { |
3219 | return build1 (VA_ARG_EXPR, type, expr); | |
3220 | } | |
0d4238dc | 3221 | |
3222 | ||
dd878098 | 3223 | /* Linked list of disabled built-in functions. */ |
3224 | ||
3225 | typedef struct disabled_builtin | |
3226 | { | |
3227 | const char *name; | |
3228 | struct disabled_builtin *next; | |
3229 | } disabled_builtin; | |
3230 | static disabled_builtin *disabled_builtins = NULL; | |
3231 | ||
1cae46be | 3232 | static bool builtin_function_disabled_p (const char *); |
dd878098 | 3233 | |
3234 | /* Disable a built-in function specified by -fno-builtin-NAME. If NAME | |
3235 | begins with "__builtin_", give an error. */ | |
3236 | ||
3237 | void | |
1cae46be | 3238 | disable_builtin_function (const char *name) |
dd878098 | 3239 | { |
3240 | if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0) | |
3241 | error ("cannot disable built-in function `%s'", name); | |
3242 | else | |
3243 | { | |
e85905e5 | 3244 | disabled_builtin *new_disabled_builtin = XNEW (disabled_builtin); |
3245 | new_disabled_builtin->name = name; | |
3246 | new_disabled_builtin->next = disabled_builtins; | |
3247 | disabled_builtins = new_disabled_builtin; | |
dd878098 | 3248 | } |
3249 | } | |
3250 | ||
3251 | ||
3252 | /* Return true if the built-in function NAME has been disabled, false | |
3253 | otherwise. */ | |
3254 | ||
3255 | static bool | |
1cae46be | 3256 | builtin_function_disabled_p (const char *name) |
dd878098 | 3257 | { |
3258 | disabled_builtin *p; | |
3259 | for (p = disabled_builtins; p != NULL; p = p->next) | |
3260 | { | |
3261 | if (strcmp (name, p->name) == 0) | |
3262 | return true; | |
3263 | } | |
3264 | return false; | |
3265 | } | |
3266 | ||
3267 | ||
0d4238dc | 3268 | /* Possibly define a builtin function with one or two names. BUILTIN_NAME |
3269 | is an __builtin_-prefixed name; NAME is the ordinary name; one or both | |
3270 | of these may be NULL (though both being NULL is useless). | |
3271 | BUILTIN_TYPE is the type of the __builtin_-prefixed function; | |
3272 | TYPE is the type of the function with the ordinary name. These | |
3273 | may differ if the ordinary name is declared with a looser type to avoid | |
e916c70c | 3274 | conflicts with headers. FUNCTION_CODE and CL are as for |
0d4238dc | 3275 | builtin_function. If LIBRARY_NAME_P is nonzero, NAME is passed as |
3276 | the LIBRARY_NAME parameter to builtin_function when declaring BUILTIN_NAME. | |
e916c70c | 3277 | If NONANSI_P is true, the name NAME is treated as a non-ANSI name; |
8fe4a266 | 3278 | ATTRS is the tree list representing the builtin's function attributes. |
0d4238dc | 3279 | Returns the declaration of BUILTIN_NAME, if any, otherwise |
3280 | the declaration of NAME. Does not declare NAME if flag_no_builtin, | |
3281 | or if NONANSI_P and flag_no_nonansi_builtin. */ | |
3282 | ||
3283 | static tree | |
1cae46be | 3284 | builtin_function_2 (const char *builtin_name, const char *name, |
e916c70c | 3285 | tree builtin_type, tree type, |
3286 | enum built_in_function function_code, | |
3287 | enum built_in_class cl, int library_name_p, | |
3288 | bool nonansi_p, tree attrs) | |
0d4238dc | 3289 | { |
3290 | tree bdecl = NULL_TREE; | |
3291 | tree decl = NULL_TREE; | |
a40609e6 | 3292 | |
0d4238dc | 3293 | if (builtin_name != 0) |
e60d3615 | 3294 | bdecl = lang_hooks.builtin_function (builtin_name, builtin_type, |
e916c70c | 3295 | function_code, cl, |
e60d3615 | 3296 | library_name_p ? name : NULL, attrs); |
a40609e6 | 3297 | |
dd878098 | 3298 | if (name != 0 && !flag_no_builtin && !builtin_function_disabled_p (name) |
3299 | && !(nonansi_p && flag_no_nonansi_builtin)) | |
e916c70c | 3300 | decl = lang_hooks.builtin_function (name, type, function_code, cl, |
e60d3615 | 3301 | NULL, attrs); |
a40609e6 | 3302 | |
0d4238dc | 3303 | return (bdecl != 0 ? bdecl : decl); |
3304 | } | |
e94026da | 3305 | \f |
d7aeef06 | 3306 | /* Nonzero if the type T promotes to int. This is (nearly) the |
3307 | integral promotions defined in ISO C99 6.3.1.1/2. */ | |
3308 | ||
3309 | bool | |
1cae46be | 3310 | c_promoting_integer_type_p (tree t) |
d7aeef06 | 3311 | { |
3312 | switch (TREE_CODE (t)) | |
3313 | { | |
3314 | case INTEGER_TYPE: | |
3315 | return (TYPE_MAIN_VARIANT (t) == char_type_node | |
3316 | || TYPE_MAIN_VARIANT (t) == signed_char_type_node | |
3317 | || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node | |
3318 | || TYPE_MAIN_VARIANT (t) == short_integer_type_node | |
7aa1e6eb | 3319 | || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node |
3320 | || TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node)); | |
d7aeef06 | 3321 | |
3322 | case ENUMERAL_TYPE: | |
3323 | /* ??? Technically all enumerations not larger than an int | |
3324 | promote to an int. But this is used along code paths | |
3325 | that only want to notice a size change. */ | |
3326 | return TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node); | |
3327 | ||
3328 | case BOOLEAN_TYPE: | |
3329 | return 1; | |
3330 | ||
3331 | default: | |
3332 | return 0; | |
3333 | } | |
3334 | } | |
3335 | ||
e94026da | 3336 | /* Return 1 if PARMS specifies a fixed number of parameters |
3337 | and none of their types is affected by default promotions. */ | |
3338 | ||
3339 | int | |
1cae46be | 3340 | self_promoting_args_p (tree parms) |
e94026da | 3341 | { |
19cb6b50 | 3342 | tree t; |
e94026da | 3343 | for (t = parms; t; t = TREE_CHAIN (t)) |
3344 | { | |
19cb6b50 | 3345 | tree type = TREE_VALUE (t); |
43f74bc4 | 3346 | |
e94026da | 3347 | if (TREE_CHAIN (t) == 0 && type != void_type_node) |
3348 | return 0; | |
3349 | ||
3350 | if (type == 0) | |
3351 | return 0; | |
3352 | ||
3353 | if (TYPE_MAIN_VARIANT (type) == float_type_node) | |
3354 | return 0; | |
3355 | ||
d7aeef06 | 3356 | if (c_promoting_integer_type_p (type)) |
e94026da | 3357 | return 0; |
3358 | } | |
3359 | return 1; | |
3360 | } | |
605fb01e | 3361 | |
c25509f2 | 3362 | /* Recursively examines the array elements of TYPE, until a non-array |
3363 | element type is found. */ | |
3364 | ||
3365 | tree | |
1cae46be | 3366 | strip_array_types (tree type) |
c25509f2 | 3367 | { |
3368 | while (TREE_CODE (type) == ARRAY_TYPE) | |
3369 | type = TREE_TYPE (type); | |
3370 | ||
3371 | return type; | |
3372 | } | |
3373 | ||
c10de5e7 | 3374 | /* Recursively remove any '*' or '&' operator from TYPE. */ |
3375 | tree | |
3376 | strip_pointer_operator (tree t) | |
3377 | { | |
3378 | while (POINTER_TYPE_P (t)) | |
3379 | t = TREE_TYPE (t); | |
3380 | return t; | |
3381 | } | |
3382 | ||
7b915c10 | 3383 | /* Walk the statement tree, rooted at *tp. Apply FUNC to all the |
a08e60ae | 3384 | sub-trees of *TP in a pre-order traversal. FUNC is called with the |
3385 | DATA and the address of each sub-tree. If FUNC returns a non-NULL | |
3386 | value, the traversal is aborted, and the value returned by FUNC is | |
3387 | returned. If FUNC sets WALK_SUBTREES to zero, then the subtrees of | |
3388 | the node being visited are not walked. | |
3389 | ||
3390 | We don't need a without_duplicates variant of this one because the | |
3391 | statement tree is a tree, not a graph. */ | |
3392 | ||
1cae46be | 3393 | tree |
3394 | walk_stmt_tree (tree *tp, walk_tree_fn func, void *data) | |
a08e60ae | 3395 | { |
3396 | enum tree_code code; | |
3397 | int walk_subtrees; | |
3398 | tree result; | |
3399 | int i, len; | |
3400 | ||
3401 | #define WALK_SUBTREE(NODE) \ | |
3402 | do \ | |
3403 | { \ | |
3404 | result = walk_stmt_tree (&(NODE), func, data); \ | |
3405 | if (result) \ | |
3406 | return result; \ | |
3407 | } \ | |
3408 | while (0) | |
3409 | ||
3410 | /* Skip empty subtrees. */ | |
3411 | if (!*tp) | |
3412 | return NULL_TREE; | |
3413 | ||
3414 | /* Skip subtrees below non-statement nodes. */ | |
bac62436 | 3415 | if (!STATEMENT_CODE_P (TREE_CODE (*tp))) |
a08e60ae | 3416 | return NULL_TREE; |
3417 | ||
3418 | /* Call the function. */ | |
3419 | walk_subtrees = 1; | |
3420 | result = (*func) (tp, &walk_subtrees, data); | |
3421 | ||
3422 | /* If we found something, return it. */ | |
3423 | if (result) | |
3424 | return result; | |
3425 | ||
a08e60ae | 3426 | /* FUNC may have modified the tree, recheck that we're looking at a |
3427 | statement node. */ | |
3428 | code = TREE_CODE (*tp); | |
bac62436 | 3429 | if (!STATEMENT_CODE_P (code)) |
a08e60ae | 3430 | return NULL_TREE; |
3431 | ||
f2b74df1 | 3432 | /* Visit the subtrees unless FUNC decided that there was nothing |
3433 | interesting below this point in the tree. */ | |
3434 | if (walk_subtrees) | |
3435 | { | |
3436 | /* Walk over all the sub-trees of this operand. Statement nodes | |
3437 | never contain RTL, and we needn't worry about TARGET_EXPRs. */ | |
3438 | len = TREE_CODE_LENGTH (code); | |
3439 | ||
3440 | /* Go through the subtrees. We need to do this in forward order so | |
3441 | that the scope of a FOR_EXPR is handled properly. */ | |
3442 | for (i = 0; i < len; ++i) | |
3443 | WALK_SUBTREE (TREE_OPERAND (*tp, i)); | |
3444 | } | |
a08e60ae | 3445 | |
3446 | /* Finally visit the chain. This can be tail-recursion optimized if | |
3447 | we write it this way. */ | |
3448 | return walk_stmt_tree (&TREE_CHAIN (*tp), func, data); | |
3449 | ||
3450 | #undef WALK_SUBTREE | |
3451 | } | |
3452 | ||
e41f0d80 | 3453 | /* Used to compare case labels. K1 and K2 are actually tree nodes |
3454 | representing case labels, or NULL_TREE for a `default' label. | |
3455 | Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after | |
3456 | K2, and 0 if K1 and K2 are equal. */ | |
3457 | ||
3458 | int | |
1cae46be | 3459 | case_compare (splay_tree_key k1, splay_tree_key k2) |
e41f0d80 | 3460 | { |
3461 | /* Consider a NULL key (such as arises with a `default' label) to be | |
3462 | smaller than anything else. */ | |
3463 | if (!k1) | |
3464 | return k2 ? -1 : 0; | |
3465 | else if (!k2) | |
3466 | return k1 ? 1 : 0; | |
3467 | ||
3468 | return tree_int_cst_compare ((tree) k1, (tree) k2); | |
3469 | } | |
3470 | ||
3471 | /* Process a case label for the range LOW_VALUE ... HIGH_VALUE. If | |
3472 | LOW_VALUE and HIGH_VALUE are both NULL_TREE then this case label is | |
3473 | actually a `default' label. If only HIGH_VALUE is NULL_TREE, then | |
3474 | case label was declared using the usual C/C++ syntax, rather than | |
3475 | the GNU case range extension. CASES is a tree containing all the | |
3476 | case ranges processed so far; COND is the condition for the | |
eaae3b75 | 3477 | switch-statement itself. Returns the CASE_LABEL_EXPR created, or |
3478 | ERROR_MARK_NODE if no CASE_LABEL_EXPR is created. */ | |
e41f0d80 | 3479 | |
3480 | tree | |
2ca392fd | 3481 | c_add_case_label (splay_tree cases, tree cond, tree orig_type, |
3482 | tree low_value, tree high_value) | |
e41f0d80 | 3483 | { |
3484 | tree type; | |
3485 | tree label; | |
3486 | tree case_label; | |
3487 | splay_tree_node node; | |
3488 | ||
3489 | /* Create the LABEL_DECL itself. */ | |
4ee9c684 | 3490 | label = create_artificial_label (); |
e41f0d80 | 3491 | |
3492 | /* If there was an error processing the switch condition, bail now | |
3493 | before we get more confused. */ | |
3494 | if (!cond || cond == error_mark_node) | |
4ee9c684 | 3495 | goto error_out; |
e41f0d80 | 3496 | |
1cae46be | 3497 | if ((low_value && TREE_TYPE (low_value) |
3498 | && POINTER_TYPE_P (TREE_TYPE (low_value))) | |
e41f0d80 | 3499 | || (high_value && TREE_TYPE (high_value) |
3500 | && POINTER_TYPE_P (TREE_TYPE (high_value)))) | |
3501 | error ("pointers are not permitted as case values"); | |
3502 | ||
3503 | /* Case ranges are a GNU extension. */ | |
3504 | if (high_value && pedantic) | |
c0f19401 | 3505 | pedwarn ("range expressions in switch statements are non-standard"); |
e41f0d80 | 3506 | |
3507 | type = TREE_TYPE (cond); | |
3508 | if (low_value) | |
3509 | { | |
3510 | low_value = check_case_value (low_value); | |
3511 | low_value = convert_and_check (type, low_value); | |
3512 | } | |
3513 | if (high_value) | |
3514 | { | |
3515 | high_value = check_case_value (high_value); | |
3516 | high_value = convert_and_check (type, high_value); | |
3517 | } | |
3518 | ||
3519 | /* If an error has occurred, bail out now. */ | |
3520 | if (low_value == error_mark_node || high_value == error_mark_node) | |
4ee9c684 | 3521 | goto error_out; |
e41f0d80 | 3522 | |
3523 | /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't | |
3524 | really a case range, even though it was written that way. Remove | |
3525 | the HIGH_VALUE to simplify later processing. */ | |
3526 | if (tree_int_cst_equal (low_value, high_value)) | |
3527 | high_value = NULL_TREE; | |
1cae46be | 3528 | if (low_value && high_value |
3529 | && !tree_int_cst_lt (low_value, high_value)) | |
e41f0d80 | 3530 | warning ("empty range specified"); |
3531 | ||
2ca392fd | 3532 | /* See if the case is in range of the type of the original testing |
3533 | expression. If both low_value and high_value are out of range, | |
3534 | don't insert the case label and return NULL_TREE. */ | |
3535 | if (low_value | |
3536 | && ! check_case_bounds (type, orig_type, | |
3537 | &low_value, high_value ? &high_value : NULL)) | |
3538 | return NULL_TREE; | |
3539 | ||
e41f0d80 | 3540 | /* Look up the LOW_VALUE in the table of case labels we already |
3541 | have. */ | |
3542 | node = splay_tree_lookup (cases, (splay_tree_key) low_value); | |
3543 | /* If there was not an exact match, check for overlapping ranges. | |
3544 | There's no need to do this if there's no LOW_VALUE or HIGH_VALUE; | |
3545 | that's a `default' label and the only overlap is an exact match. */ | |
3546 | if (!node && (low_value || high_value)) | |
3547 | { | |
3548 | splay_tree_node low_bound; | |
3549 | splay_tree_node high_bound; | |
3550 | ||
3551 | /* Even though there wasn't an exact match, there might be an | |
3552 | overlap between this case range and another case range. | |
3553 | Since we've (inductively) not allowed any overlapping case | |
3554 | ranges, we simply need to find the greatest low case label | |
3555 | that is smaller that LOW_VALUE, and the smallest low case | |
3556 | label that is greater than LOW_VALUE. If there is an overlap | |
3557 | it will occur in one of these two ranges. */ | |
3558 | low_bound = splay_tree_predecessor (cases, | |
3559 | (splay_tree_key) low_value); | |
3560 | high_bound = splay_tree_successor (cases, | |
3561 | (splay_tree_key) low_value); | |
3562 | ||
3563 | /* Check to see if the LOW_BOUND overlaps. It is smaller than | |
3564 | the LOW_VALUE, so there is no need to check unless the | |
3565 | LOW_BOUND is in fact itself a case range. */ | |
3566 | if (low_bound | |
3567 | && CASE_HIGH ((tree) low_bound->value) | |
3568 | && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value), | |
3569 | low_value) >= 0) | |
3570 | node = low_bound; | |
3571 | /* Check to see if the HIGH_BOUND overlaps. The low end of that | |
3572 | range is bigger than the low end of the current range, so we | |
3573 | are only interested if the current range is a real range, and | |
3574 | not an ordinary case label. */ | |
1cae46be | 3575 | else if (high_bound |
e41f0d80 | 3576 | && high_value |
3577 | && (tree_int_cst_compare ((tree) high_bound->key, | |
3578 | high_value) | |
3579 | <= 0)) | |
3580 | node = high_bound; | |
3581 | } | |
3582 | /* If there was an overlap, issue an error. */ | |
3583 | if (node) | |
3584 | { | |
eaae3b75 | 3585 | tree duplicate = CASE_LABEL ((tree) node->value); |
e41f0d80 | 3586 | |
3587 | if (high_value) | |
3588 | { | |
3589 | error ("duplicate (or overlapping) case value"); | |
9bc3739f | 3590 | error ("%Jthis is the first entry overlapping that value", duplicate); |
e41f0d80 | 3591 | } |
3592 | else if (low_value) | |
3593 | { | |
3594 | error ("duplicate case value") ; | |
9bc3739f | 3595 | error ("%Jpreviously used here", duplicate); |
e41f0d80 | 3596 | } |
3597 | else | |
3598 | { | |
3599 | error ("multiple default labels in one switch"); | |
9bc3739f | 3600 | error ("%Jthis is the first default label", duplicate); |
e41f0d80 | 3601 | } |
4ee9c684 | 3602 | goto error_out; |
e41f0d80 | 3603 | } |
3604 | ||
3605 | /* Add a CASE_LABEL to the statement-tree. */ | |
3606 | case_label = add_stmt (build_case_label (low_value, high_value, label)); | |
3607 | /* Register this case label in the splay tree. */ | |
1cae46be | 3608 | splay_tree_insert (cases, |
e41f0d80 | 3609 | (splay_tree_key) low_value, |
3610 | (splay_tree_value) case_label); | |
3611 | ||
3612 | return case_label; | |
4ee9c684 | 3613 | |
3614 | error_out: | |
daf6dff5 | 3615 | /* Add a label so that the back-end doesn't think that the beginning of |
4ee9c684 | 3616 | the switch is unreachable. Note that we do not add a case label, as |
3617 | that just leads to duplicates and thence to aborts later on. */ | |
3618 | if (!cases->root) | |
3619 | { | |
3620 | tree t = create_artificial_label (); | |
daf6dff5 | 3621 | add_stmt (build_stmt (LABEL_EXPR, t)); |
4ee9c684 | 3622 | } |
3623 | return error_mark_node; | |
3624 | } | |
3625 | ||
3626 | /* Subroutines of c_do_switch_warnings, called via splay_tree_foreach. | |
3627 | Used to verify that case values match up with enumerator values. */ | |
3628 | ||
3629 | static void | |
3630 | match_case_to_enum_1 (tree key, tree type, tree label) | |
3631 | { | |
3632 | char buf[2 + 2*HOST_BITS_PER_WIDE_INT/4 + 1]; | |
3633 | ||
3634 | /* ??? Not working too hard to print the double-word value. | |
3635 | Should perhaps be done with %lwd in the diagnostic routines? */ | |
3636 | if (TREE_INT_CST_HIGH (key) == 0) | |
3637 | snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_UNSIGNED, | |
3638 | TREE_INT_CST_LOW (key)); | |
3639 | else if (!TYPE_UNSIGNED (type) | |
3640 | && TREE_INT_CST_HIGH (key) == -1 | |
3641 | && TREE_INT_CST_LOW (key) != 0) | |
3642 | snprintf (buf, sizeof (buf), "-" HOST_WIDE_INT_PRINT_UNSIGNED, | |
3643 | -TREE_INT_CST_LOW (key)); | |
3644 | else | |
3645 | snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_DOUBLE_HEX, | |
3646 | TREE_INT_CST_HIGH (key), TREE_INT_CST_LOW (key)); | |
3647 | ||
3648 | if (TYPE_NAME (type) == 0) | |
3649 | warning ("%Jcase value `%s' not in enumerated type", | |
eaae3b75 | 3650 | CASE_LABEL (label), buf); |
4ee9c684 | 3651 | else |
3652 | warning ("%Jcase value `%s' not in enumerated type `%T'", | |
eaae3b75 | 3653 | CASE_LABEL (label), buf, type); |
4ee9c684 | 3654 | } |
3655 | ||
3656 | static int | |
3657 | match_case_to_enum (splay_tree_node node, void *data) | |
3658 | { | |
3659 | tree label = (tree) node->value; | |
4fd61bc6 | 3660 | tree type = (tree) data; |
4ee9c684 | 3661 | |
3662 | /* Skip default case. */ | |
3663 | if (!CASE_LOW (label)) | |
3664 | return 0; | |
3665 | ||
3666 | /* If TREE_ADDRESSABLE is not set, that means CASE_LOW did not appear | |
3667 | when we did our enum->case scan. Reset our scratch bit after. */ | |
3668 | if (!TREE_ADDRESSABLE (label)) | |
3669 | match_case_to_enum_1 (CASE_LOW (label), type, label); | |
3670 | else | |
3671 | TREE_ADDRESSABLE (label) = 0; | |
3672 | ||
3673 | /* If CASE_HIGH is non-null, we have a range. Here we must search. | |
3674 | Note that the old code in stmt.c did not check for the values in | |
3675 | the range either, just the endpoints. */ | |
3676 | if (CASE_HIGH (label)) | |
3677 | { | |
3678 | tree chain, key = CASE_HIGH (label); | |
3679 | ||
3680 | for (chain = TYPE_VALUES (type); | |
3681 | chain && !tree_int_cst_equal (key, TREE_VALUE (chain)); | |
3682 | chain = TREE_CHAIN (chain)) | |
3683 | continue; | |
3684 | if (!chain) | |
3685 | match_case_to_enum_1 (key, type, label); | |
3686 | } | |
3687 | ||
3688 | return 0; | |
3689 | } | |
3690 | ||
3691 | /* Handle -Wswitch*. Called from the front end after parsing the switch | |
3692 | construct. */ | |
3693 | /* ??? Should probably be somewhere generic, since other languages besides | |
3694 | C and C++ would want this. We'd want to agree on the datastructure, | |
3695 | however, which is a problem. Alternately, we operate on gimplified | |
3696 | switch_exprs, which I don't especially like. At the moment, however, | |
3697 | C/C++ are the only tree-ssa languages that support enumerations at all, | |
3698 | so the point is moot. */ | |
3699 | ||
3700 | void | |
3701 | c_do_switch_warnings (splay_tree cases, tree switch_stmt) | |
3702 | { | |
b27ac6b5 | 3703 | splay_tree_node default_node; |
9a6486a6 | 3704 | location_t switch_location; |
4ee9c684 | 3705 | tree type; |
3706 | ||
3707 | if (!warn_switch && !warn_switch_enum && !warn_switch_default) | |
3708 | return; | |
3709 | ||
9a6486a6 | 3710 | if (EXPR_HAS_LOCATION (switch_stmt)) |
3711 | switch_location = EXPR_LOCATION (switch_stmt); | |
3712 | else | |
3713 | switch_location = input_location; | |
3714 | ||
4ee9c684 | 3715 | type = SWITCH_TYPE (switch_stmt); |
3716 | ||
3717 | default_node = splay_tree_lookup (cases, (splay_tree_key) NULL); | |
3718 | if (warn_switch_default && !default_node) | |
9a6486a6 | 3719 | warning ("%Hswitch missing default case", &switch_location); |
4ee9c684 | 3720 | |
3721 | /* If the switch expression was an enumerated type, check that | |
3722 | exactly all enumeration literals are covered by the cases. | |
3723 | The check is made when -Wswitch was specified and there is no | |
3724 | default case, or when -Wswitch-enum was specified. */ | |
3725 | if (((warn_switch && !default_node) || warn_switch_enum) | |
3726 | && type && TREE_CODE (type) == ENUMERAL_TYPE | |
3727 | && TREE_CODE (SWITCH_COND (switch_stmt)) != INTEGER_CST) | |
3728 | { | |
3729 | tree chain; | |
3730 | ||
3731 | /* The time complexity here is O(N*lg(N)) worst case, but for the | |
b27ac6b5 | 3732 | common case of monotonically increasing enumerators, it is |
4ee9c684 | 3733 | O(N), since the nature of the splay tree will keep the next |
3734 | element adjacent to the root at all times. */ | |
3735 | ||
3736 | for (chain = TYPE_VALUES (type); chain; chain = TREE_CHAIN (chain)) | |
3737 | { | |
3738 | splay_tree_node node | |
3739 | = splay_tree_lookup (cases, (splay_tree_key) TREE_VALUE (chain)); | |
3740 | ||
3741 | if (node) | |
3742 | { | |
3743 | /* Mark the CASE_LOW part of the case entry as seen, so | |
b27ac6b5 | 3744 | that we save time later. Choose TREE_ADDRESSABLE |
4ee9c684 | 3745 | randomly as a bit that won't have been set to-date. */ |
3746 | tree label = (tree) node->value; | |
3747 | TREE_ADDRESSABLE (label) = 1; | |
3748 | } | |
3749 | else | |
3750 | { | |
3751 | /* Warn if there are enumerators that don't correspond to | |
3752 | case expressions. */ | |
3753 | warning ("%Henumeration value `%E' not handled in switch", | |
9a6486a6 | 3754 | &switch_location, TREE_PURPOSE (chain)); |
4ee9c684 | 3755 | } |
3756 | } | |
3757 | ||
3758 | /* Warn if there are case expressions that don't correspond to | |
3759 | enumerators. This can occur since C and C++ don't enforce | |
3760 | type-checking of assignments to enumeration variables. | |
3761 | ||
3762 | The time complexity here is O(N**2) worst case, since we've | |
3763 | not sorted the enumeration values. However, in the absence | |
b27ac6b5 | 3764 | of case ranges this is O(N), since all single cases that |
4ee9c684 | 3765 | corresponded to enumerations have been marked above. */ |
3766 | ||
3767 | splay_tree_foreach (cases, match_case_to_enum, type); | |
3768 | } | |
e41f0d80 | 3769 | } |
3770 | ||
9dd48740 | 3771 | /* Finish an expression taking the address of LABEL (an |
3772 | IDENTIFIER_NODE). Returns an expression for the address. */ | |
d0a47c8d | 3773 | |
1cae46be | 3774 | tree |
3775 | finish_label_address_expr (tree label) | |
d0a47c8d | 3776 | { |
3777 | tree result; | |
3778 | ||
3779 | if (pedantic) | |
c0f19401 | 3780 | pedwarn ("taking the address of a label is non-standard"); |
d0a47c8d | 3781 | |
9dd48740 | 3782 | if (label == error_mark_node) |
3783 | return error_mark_node; | |
3784 | ||
d0a47c8d | 3785 | label = lookup_label (label); |
3786 | if (label == NULL_TREE) | |
3787 | result = null_pointer_node; | |
3788 | else | |
3789 | { | |
3790 | TREE_USED (label) = 1; | |
3791 | result = build1 (ADDR_EXPR, ptr_type_node, label); | |
d0a47c8d | 3792 | /* The current function in not necessarily uninlinable. |
3793 | Computed gotos are incompatible with inlining, but the value | |
3794 | here could be used only in a diagnostic, for example. */ | |
3795 | } | |
3796 | ||
3797 | return result; | |
3798 | } | |
3799 | ||
e41f0d80 | 3800 | /* Hook used by expand_expr to expand language-specific tree codes. */ |
b27ac6b5 | 3801 | /* The only things that should go here are bits needed to expand |
365db11e | 3802 | constant initializers. Everything else should be handled by the |
4ee9c684 | 3803 | gimplification routines. */ |
e41f0d80 | 3804 | |
3805 | rtx | |
b27ac6b5 | 3806 | c_expand_expr (tree exp, rtx target, enum machine_mode tmode, |
60ffaf4d | 3807 | int modifier /* Actually enum_modifier. */, |
3808 | rtx *alt_rtl) | |
e41f0d80 | 3809 | { |
3810 | switch (TREE_CODE (exp)) | |
3811 | { | |
ec11e38e | 3812 | case COMPOUND_LITERAL_EXPR: |
3813 | { | |
3814 | /* Initialize the anonymous variable declared in the compound | |
3815 | literal, then return the variable. */ | |
3816 | tree decl = COMPOUND_LITERAL_EXPR_DECL (exp); | |
3817 | emit_local_var (decl); | |
60ffaf4d | 3818 | return expand_expr_real (decl, target, tmode, modifier, alt_rtl); |
ec11e38e | 3819 | } |
3820 | ||
e41f0d80 | 3821 | default: |
3822 | abort (); | |
3823 | } | |
e41f0d80 | 3824 | } |
3825 | ||
ec11e38e | 3826 | /* Hook used by staticp to handle language-specific tree codes. */ |
3827 | ||
b69ebfcd | 3828 | bool |
1cae46be | 3829 | c_staticp (tree exp) |
ec11e38e | 3830 | { |
3831 | if (TREE_CODE (exp) == COMPOUND_LITERAL_EXPR | |
3832 | && TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (exp))) | |
b69ebfcd | 3833 | return true; |
3834 | return false; | |
ec11e38e | 3835 | } |
4f9a1c9b | 3836 | \f |
3837 | ||
3838 | /* Given a boolean expression ARG, return a tree representing an increment | |
3839 | or decrement (as indicated by CODE) of ARG. The front end must check for | |
3840 | invalid cases (e.g., decrement in C++). */ | |
3841 | tree | |
1cae46be | 3842 | boolean_increment (enum tree_code code, tree arg) |
4f9a1c9b | 3843 | { |
3844 | tree val; | |
3c2239cf | 3845 | tree true_res = boolean_true_node; |
c0f19401 | 3846 | |
4f9a1c9b | 3847 | arg = stabilize_reference (arg); |
3848 | switch (code) | |
3849 | { | |
3850 | case PREINCREMENT_EXPR: | |
3851 | val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res); | |
3852 | break; | |
3853 | case POSTINCREMENT_EXPR: | |
3854 | val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res); | |
3855 | arg = save_expr (arg); | |
3856 | val = build (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); | |
3857 | val = build (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
3858 | break; | |
3859 | case PREDECREMENT_EXPR: | |
3860 | val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, invert_truthvalue (arg)); | |
3861 | break; | |
3862 | case POSTDECREMENT_EXPR: | |
3863 | val = build (MODIFY_EXPR, TREE_TYPE (arg), arg, invert_truthvalue (arg)); | |
3864 | arg = save_expr (arg); | |
3865 | val = build (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); | |
3866 | val = build (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
3867 | break; | |
3868 | default: | |
3869 | abort (); | |
3870 | } | |
3871 | TREE_SIDE_EFFECTS (val) = 1; | |
3872 | return val; | |
3873 | } | |
76a6e674 | 3874 | \f |
fd6f6435 | 3875 | /* Built-in macros for stddef.h, that require macros defined in this |
3876 | file. */ | |
79cf3ec1 | 3877 | void |
1cae46be | 3878 | c_stddef_cpp_builtins(void) |
1ed9d5f5 | 3879 | { |
63994318 | 3880 | builtin_define_with_value ("__SIZE_TYPE__", SIZE_TYPE, 0); |
3881 | builtin_define_with_value ("__PTRDIFF_TYPE__", PTRDIFF_TYPE, 0); | |
3882 | builtin_define_with_value ("__WCHAR_TYPE__", MODIFIED_WCHAR_TYPE, 0); | |
3883 | builtin_define_with_value ("__WINT_TYPE__", WINT_TYPE, 0); | |
36bccbfc | 3884 | builtin_define_with_value ("__INTMAX_TYPE__", INTMAX_TYPE, 0); |
3885 | builtin_define_with_value ("__UINTMAX_TYPE__", UINTMAX_TYPE, 0); | |
574006c3 | 3886 | } |
3887 | ||
7d3b509a | 3888 | static void |
1cae46be | 3889 | c_init_attributes (void) |
7d3b509a | 3890 | { |
3891 | /* Fill in the built_in_attributes array. */ | |
3892 | #define DEF_ATTR_NULL_TREE(ENUM) \ | |
3893 | built_in_attributes[(int) ENUM] = NULL_TREE; | |
3894 | #define DEF_ATTR_INT(ENUM, VALUE) \ | |
3895 | built_in_attributes[(int) ENUM] = build_int_2 (VALUE, VALUE < 0 ? -1 : 0); | |
3896 | #define DEF_ATTR_IDENT(ENUM, STRING) \ | |
3897 | built_in_attributes[(int) ENUM] = get_identifier (STRING); | |
3898 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \ | |
3899 | built_in_attributes[(int) ENUM] \ | |
3900 | = tree_cons (built_in_attributes[(int) PURPOSE], \ | |
3901 | built_in_attributes[(int) VALUE], \ | |
3902 | built_in_attributes[(int) CHAIN]); | |
7d3b509a | 3903 | #include "builtin-attrs.def" |
3904 | #undef DEF_ATTR_NULL_TREE | |
3905 | #undef DEF_ATTR_INT | |
3906 | #undef DEF_ATTR_IDENT | |
3907 | #undef DEF_ATTR_TREE_LIST | |
76a6e674 | 3908 | } |
5f3cead1 | 3909 | |
f8e93a2e | 3910 | /* Attribute handlers common to C front ends. */ |
3911 | ||
3912 | /* Handle a "packed" attribute; arguments as in | |
3913 | struct attribute_spec.handler. */ | |
3914 | ||
3915 | static tree | |
9a03a746 | 3916 | handle_packed_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
09347743 | 3917 | int flags, bool *no_add_attrs) |
f8e93a2e | 3918 | { |
f40175cb | 3919 | if (TYPE_P (*node)) |
f8e93a2e | 3920 | { |
3921 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
f40175cb | 3922 | *node = build_type_copy (*node); |
3923 | TYPE_PACKED (*node) = 1; | |
3924 | if (TYPE_MAIN_VARIANT (*node) == *node) | |
3925 | { | |
3926 | /* If it is the main variant, then pack the other variants | |
3927 | too. This happens in, | |
b27ac6b5 | 3928 | |
f40175cb | 3929 | struct Foo { |
3930 | struct Foo const *ptr; // creates a variant w/o packed flag | |
3931 | } __ attribute__((packed)); // packs it now. | |
3932 | */ | |
3933 | tree probe; | |
b27ac6b5 | 3934 | |
f40175cb | 3935 | for (probe = *node; probe; probe = TYPE_NEXT_VARIANT (probe)) |
3936 | TYPE_PACKED (probe) = 1; | |
3937 | } | |
b27ac6b5 | 3938 | |
f8e93a2e | 3939 | } |
3940 | else if (TREE_CODE (*node) == FIELD_DECL) | |
3941 | DECL_PACKED (*node) = 1; | |
3942 | /* We can't set DECL_PACKED for a VAR_DECL, because the bit is | |
f40175cb | 3943 | used for DECL_REGISTER. It wouldn't mean anything anyway. |
3944 | We can't set DECL_PACKED on the type of a TYPE_DECL, because | |
3945 | that changes what the typedef is typing. */ | |
f8e93a2e | 3946 | else |
3947 | { | |
3948 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
3949 | *no_add_attrs = true; | |
3950 | } | |
3951 | ||
3952 | return NULL_TREE; | |
3953 | } | |
3954 | ||
3955 | /* Handle a "nocommon" attribute; arguments as in | |
3956 | struct attribute_spec.handler. */ | |
3957 | ||
3958 | static tree | |
1cae46be | 3959 | handle_nocommon_attribute (tree *node, tree name, |
9a03a746 | 3960 | tree ARG_UNUSED (args), |
3961 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 3962 | { |
3963 | if (TREE_CODE (*node) == VAR_DECL) | |
3964 | DECL_COMMON (*node) = 0; | |
3965 | else | |
3966 | { | |
3967 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
3968 | *no_add_attrs = true; | |
3969 | } | |
3970 | ||
3971 | return NULL_TREE; | |
3972 | } | |
3973 | ||
3974 | /* Handle a "common" attribute; arguments as in | |
3975 | struct attribute_spec.handler. */ | |
3976 | ||
3977 | static tree | |
9a03a746 | 3978 | handle_common_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
3979 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 3980 | { |
3981 | if (TREE_CODE (*node) == VAR_DECL) | |
3982 | DECL_COMMON (*node) = 1; | |
3983 | else | |
3984 | { | |
3985 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
3986 | *no_add_attrs = true; | |
3987 | } | |
3988 | ||
3989 | return NULL_TREE; | |
3990 | } | |
3991 | ||
3992 | /* Handle a "noreturn" attribute; arguments as in | |
3993 | struct attribute_spec.handler. */ | |
3994 | ||
3995 | static tree | |
9a03a746 | 3996 | handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
3997 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 3998 | { |
3999 | tree type = TREE_TYPE (*node); | |
4000 | ||
4001 | /* See FIXME comment in c_common_attribute_table. */ | |
4002 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4003 | TREE_THIS_VOLATILE (*node) = 1; | |
4004 | else if (TREE_CODE (type) == POINTER_TYPE | |
4005 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
4006 | TREE_TYPE (*node) | |
4007 | = build_pointer_type | |
4008 | (build_type_variant (TREE_TYPE (type), | |
71bda45d | 4009 | TYPE_READONLY (TREE_TYPE (type)), 1)); |
f8e93a2e | 4010 | else |
4011 | { | |
4012 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4013 | *no_add_attrs = true; | |
4014 | } | |
4015 | ||
4016 | return NULL_TREE; | |
4017 | } | |
4018 | ||
4019 | /* Handle a "noinline" attribute; arguments as in | |
4020 | struct attribute_spec.handler. */ | |
4021 | ||
4022 | static tree | |
1cae46be | 4023 | handle_noinline_attribute (tree *node, tree name, |
9a03a746 | 4024 | tree ARG_UNUSED (args), |
4025 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4026 | { |
4027 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4028 | DECL_UNINLINABLE (*node) = 1; | |
4029 | else | |
4030 | { | |
4031 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4032 | *no_add_attrs = true; | |
4033 | } | |
4034 | ||
4035 | return NULL_TREE; | |
4036 | } | |
4037 | ||
4038 | /* Handle a "always_inline" attribute; arguments as in | |
4039 | struct attribute_spec.handler. */ | |
4040 | ||
4041 | static tree | |
1cae46be | 4042 | handle_always_inline_attribute (tree *node, tree name, |
9a03a746 | 4043 | tree ARG_UNUSED (args), |
4044 | int ARG_UNUSED (flags), | |
09347743 | 4045 | bool *no_add_attrs) |
f8e93a2e | 4046 | { |
4047 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4048 | { | |
4049 | /* Do nothing else, just set the attribute. We'll get at | |
4050 | it later with lookup_attribute. */ | |
4051 | } | |
4052 | else | |
4053 | { | |
4054 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4055 | *no_add_attrs = true; | |
4056 | } | |
4057 | ||
4058 | return NULL_TREE; | |
4059 | } | |
4060 | ||
4061 | /* Handle a "used" attribute; arguments as in | |
4062 | struct attribute_spec.handler. */ | |
4063 | ||
4064 | static tree | |
9a03a746 | 4065 | handle_used_attribute (tree *pnode, tree name, tree ARG_UNUSED (args), |
4066 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4067 | { |
d0a31bd8 | 4068 | tree node = *pnode; |
4069 | ||
4070 | if (TREE_CODE (node) == FUNCTION_DECL | |
4071 | || (TREE_CODE (node) == VAR_DECL && TREE_STATIC (node))) | |
f54ed8bc | 4072 | { |
f54ed8bc | 4073 | TREE_USED (node) = 1; |
4074 | } | |
f8e93a2e | 4075 | else |
4076 | { | |
4077 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4078 | *no_add_attrs = true; | |
4079 | } | |
4080 | ||
4081 | return NULL_TREE; | |
4082 | } | |
4083 | ||
4084 | /* Handle a "unused" attribute; arguments as in | |
4085 | struct attribute_spec.handler. */ | |
4086 | ||
4087 | static tree | |
9a03a746 | 4088 | handle_unused_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
4089 | int flags, bool *no_add_attrs) | |
f8e93a2e | 4090 | { |
4091 | if (DECL_P (*node)) | |
4092 | { | |
4093 | tree decl = *node; | |
4094 | ||
4095 | if (TREE_CODE (decl) == PARM_DECL | |
4096 | || TREE_CODE (decl) == VAR_DECL | |
4097 | || TREE_CODE (decl) == FUNCTION_DECL | |
4098 | || TREE_CODE (decl) == LABEL_DECL | |
4099 | || TREE_CODE (decl) == TYPE_DECL) | |
4100 | TREE_USED (decl) = 1; | |
4101 | else | |
4102 | { | |
4103 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4104 | *no_add_attrs = true; | |
4105 | } | |
4106 | } | |
4107 | else | |
4108 | { | |
4109 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
4110 | *node = build_type_copy (*node); | |
4111 | TREE_USED (*node) = 1; | |
4112 | } | |
4113 | ||
4114 | return NULL_TREE; | |
4115 | } | |
4116 | ||
4117 | /* Handle a "const" attribute; arguments as in | |
4118 | struct attribute_spec.handler. */ | |
4119 | ||
4120 | static tree | |
9a03a746 | 4121 | handle_const_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
4122 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4123 | { |
4124 | tree type = TREE_TYPE (*node); | |
4125 | ||
4126 | /* See FIXME comment on noreturn in c_common_attribute_table. */ | |
4127 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4128 | TREE_READONLY (*node) = 1; | |
4129 | else if (TREE_CODE (type) == POINTER_TYPE | |
4130 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
4131 | TREE_TYPE (*node) | |
4132 | = build_pointer_type | |
4133 | (build_type_variant (TREE_TYPE (type), 1, | |
4134 | TREE_THIS_VOLATILE (TREE_TYPE (type)))); | |
4135 | else | |
4136 | { | |
4137 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4138 | *no_add_attrs = true; | |
4139 | } | |
4140 | ||
4141 | return NULL_TREE; | |
4142 | } | |
4143 | ||
4144 | /* Handle a "transparent_union" attribute; arguments as in | |
4145 | struct attribute_spec.handler. */ | |
4146 | ||
4147 | static tree | |
1cae46be | 4148 | handle_transparent_union_attribute (tree *node, tree name, |
9a03a746 | 4149 | tree ARG_UNUSED (args), int flags, |
09347743 | 4150 | bool *no_add_attrs) |
f8e93a2e | 4151 | { |
4152 | tree decl = NULL_TREE; | |
4153 | tree *type = NULL; | |
4154 | int is_type = 0; | |
4155 | ||
4156 | if (DECL_P (*node)) | |
4157 | { | |
4158 | decl = *node; | |
4159 | type = &TREE_TYPE (decl); | |
4160 | is_type = TREE_CODE (*node) == TYPE_DECL; | |
4161 | } | |
4162 | else if (TYPE_P (*node)) | |
4163 | type = node, is_type = 1; | |
4164 | ||
4165 | if (is_type | |
4166 | && TREE_CODE (*type) == UNION_TYPE | |
4167 | && (decl == 0 | |
4168 | || (TYPE_FIELDS (*type) != 0 | |
4169 | && TYPE_MODE (*type) == DECL_MODE (TYPE_FIELDS (*type))))) | |
4170 | { | |
4171 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
4172 | *type = build_type_copy (*type); | |
4173 | TYPE_TRANSPARENT_UNION (*type) = 1; | |
4174 | } | |
4175 | else if (decl != 0 && TREE_CODE (decl) == PARM_DECL | |
4176 | && TREE_CODE (*type) == UNION_TYPE | |
4177 | && TYPE_MODE (*type) == DECL_MODE (TYPE_FIELDS (*type))) | |
4178 | DECL_TRANSPARENT_UNION (decl) = 1; | |
4179 | else | |
4180 | { | |
4181 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4182 | *no_add_attrs = true; | |
4183 | } | |
4184 | ||
4185 | return NULL_TREE; | |
4186 | } | |
4187 | ||
4188 | /* Handle a "constructor" attribute; arguments as in | |
4189 | struct attribute_spec.handler. */ | |
4190 | ||
4191 | static tree | |
1cae46be | 4192 | handle_constructor_attribute (tree *node, tree name, |
9a03a746 | 4193 | tree ARG_UNUSED (args), |
4194 | int ARG_UNUSED (flags), | |
09347743 | 4195 | bool *no_add_attrs) |
f8e93a2e | 4196 | { |
4197 | tree decl = *node; | |
4198 | tree type = TREE_TYPE (decl); | |
4199 | ||
4200 | if (TREE_CODE (decl) == FUNCTION_DECL | |
4201 | && TREE_CODE (type) == FUNCTION_TYPE | |
4202 | && decl_function_context (decl) == 0) | |
4203 | { | |
4204 | DECL_STATIC_CONSTRUCTOR (decl) = 1; | |
4205 | TREE_USED (decl) = 1; | |
4206 | } | |
4207 | else | |
4208 | { | |
4209 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4210 | *no_add_attrs = true; | |
4211 | } | |
4212 | ||
4213 | return NULL_TREE; | |
4214 | } | |
4215 | ||
4216 | /* Handle a "destructor" attribute; arguments as in | |
4217 | struct attribute_spec.handler. */ | |
4218 | ||
4219 | static tree | |
1cae46be | 4220 | handle_destructor_attribute (tree *node, tree name, |
9a03a746 | 4221 | tree ARG_UNUSED (args), |
4222 | int ARG_UNUSED (flags), | |
09347743 | 4223 | bool *no_add_attrs) |
f8e93a2e | 4224 | { |
4225 | tree decl = *node; | |
4226 | tree type = TREE_TYPE (decl); | |
4227 | ||
4228 | if (TREE_CODE (decl) == FUNCTION_DECL | |
4229 | && TREE_CODE (type) == FUNCTION_TYPE | |
4230 | && decl_function_context (decl) == 0) | |
4231 | { | |
4232 | DECL_STATIC_DESTRUCTOR (decl) = 1; | |
4233 | TREE_USED (decl) = 1; | |
4234 | } | |
4235 | else | |
4236 | { | |
4237 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4238 | *no_add_attrs = true; | |
4239 | } | |
4240 | ||
4241 | return NULL_TREE; | |
4242 | } | |
4243 | ||
4244 | /* Handle a "mode" attribute; arguments as in | |
4245 | struct attribute_spec.handler. */ | |
4246 | ||
4247 | static tree | |
9a03a746 | 4248 | handle_mode_attribute (tree *node, tree name, tree args, |
4249 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4250 | { |
4251 | tree type = *node; | |
4252 | ||
4253 | *no_add_attrs = true; | |
4254 | ||
4255 | if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE) | |
4256 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4257 | else | |
4258 | { | |
4259 | int j; | |
4260 | const char *p = IDENTIFIER_POINTER (TREE_VALUE (args)); | |
4261 | int len = strlen (p); | |
4262 | enum machine_mode mode = VOIDmode; | |
4263 | tree typefm; | |
805e22b2 | 4264 | tree ptr_type; |
f8e93a2e | 4265 | |
4266 | if (len > 4 && p[0] == '_' && p[1] == '_' | |
4267 | && p[len - 1] == '_' && p[len - 2] == '_') | |
4268 | { | |
4fd61bc6 | 4269 | char *newp = (char *) alloca (len - 1); |
f8e93a2e | 4270 | |
4271 | strcpy (newp, &p[2]); | |
4272 | newp[len - 4] = '\0'; | |
4273 | p = newp; | |
4274 | } | |
4275 | ||
4276 | /* Change this type to have a type with the specified mode. | |
4277 | First check for the special modes. */ | |
4278 | if (! strcmp (p, "byte")) | |
4279 | mode = byte_mode; | |
4280 | else if (!strcmp (p, "word")) | |
4281 | mode = word_mode; | |
4282 | else if (! strcmp (p, "pointer")) | |
4283 | mode = ptr_mode; | |
4284 | else | |
4285 | for (j = 0; j < NUM_MACHINE_MODES; j++) | |
4286 | if (!strcmp (p, GET_MODE_NAME (j))) | |
4287 | mode = (enum machine_mode) j; | |
4288 | ||
4289 | if (mode == VOIDmode) | |
4917c376 | 4290 | { |
4291 | error ("unknown machine mode `%s'", p); | |
4292 | return NULL_TREE; | |
4293 | } | |
4294 | ||
4295 | if (VECTOR_MODE_P (mode)) | |
4296 | { | |
4297 | warning ("specifying vector types with __attribute__ ((mode)) " | |
4298 | "is deprecated"); | |
4299 | warning ("use __attribute__ ((vector_size)) instead"); | |
4300 | } | |
4301 | ||
78a8ed03 | 4302 | typefm = lang_hooks.types.type_for_mode (mode, TYPE_UNSIGNED (type)); |
4917c376 | 4303 | if (typefm == NULL_TREE) |
f8e93a2e | 4304 | error ("no data type for mode `%s'", p); |
4917c376 | 4305 | |
805e22b2 | 4306 | else if ((TREE_CODE (type) == POINTER_TYPE |
4307 | || TREE_CODE (type) == REFERENCE_TYPE) | |
883b2e73 | 4308 | && !targetm.valid_pointer_mode (mode)) |
805e22b2 | 4309 | error ("invalid pointer mode `%s'", p); |
f8e93a2e | 4310 | else |
ead34f59 | 4311 | { |
4312 | /* If this is a vector, make sure we either have hardware | |
4313 | support, or we can emulate it. */ | |
903669fa | 4314 | if (VECTOR_MODE_P (mode) && !vector_mode_valid_p (mode)) |
ead34f59 | 4315 | { |
4316 | error ("unable to emulate '%s'", GET_MODE_NAME (mode)); | |
4317 | return NULL_TREE; | |
4318 | } | |
4319 | ||
805e22b2 | 4320 | if (TREE_CODE (type) == POINTER_TYPE) |
4321 | { | |
4322 | ptr_type = build_pointer_type_for_mode (TREE_TYPE (type), | |
b24423db | 4323 | mode, false); |
805e22b2 | 4324 | *node = ptr_type; |
4325 | } | |
4326 | else if (TREE_CODE (type) == REFERENCE_TYPE) | |
4327 | { | |
4328 | ptr_type = build_reference_type_for_mode (TREE_TYPE (type), | |
b24423db | 4329 | mode, false); |
805e22b2 | 4330 | *node = ptr_type; |
4331 | } | |
4332 | else | |
4917c376 | 4333 | *node = typefm; |
ead34f59 | 4334 | /* No need to layout the type here. The caller should do this. */ |
4335 | } | |
f8e93a2e | 4336 | } |
4337 | ||
4338 | return NULL_TREE; | |
4339 | } | |
4340 | ||
4341 | /* Handle a "section" attribute; arguments as in | |
4342 | struct attribute_spec.handler. */ | |
4343 | ||
4344 | static tree | |
9a03a746 | 4345 | handle_section_attribute (tree *node, tree ARG_UNUSED (name), tree args, |
4346 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4347 | { |
4348 | tree decl = *node; | |
4349 | ||
4350 | if (targetm.have_named_sections) | |
4351 | { | |
4352 | if ((TREE_CODE (decl) == FUNCTION_DECL | |
4353 | || TREE_CODE (decl) == VAR_DECL) | |
4354 | && TREE_CODE (TREE_VALUE (args)) == STRING_CST) | |
4355 | { | |
4356 | if (TREE_CODE (decl) == VAR_DECL | |
4357 | && current_function_decl != NULL_TREE | |
4358 | && ! TREE_STATIC (decl)) | |
4359 | { | |
9bc3739f | 4360 | error ("%Jsection attribute cannot be specified for " |
4ee9c684 | 4361 | "local variables", decl); |
f8e93a2e | 4362 | *no_add_attrs = true; |
4363 | } | |
4364 | ||
4365 | /* The decl may have already been given a section attribute | |
4366 | from a previous declaration. Ensure they match. */ | |
4367 | else if (DECL_SECTION_NAME (decl) != NULL_TREE | |
4368 | && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)), | |
4369 | TREE_STRING_POINTER (TREE_VALUE (args))) != 0) | |
4370 | { | |
9bc3739f | 4371 | error ("%Jsection of '%D' conflicts with previous declaration", |
4ee9c684 | 4372 | *node, *node); |
f8e93a2e | 4373 | *no_add_attrs = true; |
4374 | } | |
4375 | else | |
4376 | DECL_SECTION_NAME (decl) = TREE_VALUE (args); | |
4377 | } | |
4378 | else | |
4379 | { | |
9bc3739f | 4380 | error ("%Jsection attribute not allowed for '%D'", *node, *node); |
f8e93a2e | 4381 | *no_add_attrs = true; |
4382 | } | |
4383 | } | |
4384 | else | |
4385 | { | |
9bc3739f | 4386 | error ("%Jsection attributes are not supported for this target", *node); |
f8e93a2e | 4387 | *no_add_attrs = true; |
4388 | } | |
4389 | ||
4390 | return NULL_TREE; | |
4391 | } | |
4392 | ||
4393 | /* Handle a "aligned" attribute; arguments as in | |
4394 | struct attribute_spec.handler. */ | |
4395 | ||
4396 | static tree | |
9a03a746 | 4397 | handle_aligned_attribute (tree *node, tree ARG_UNUSED (name), tree args, |
09347743 | 4398 | int flags, bool *no_add_attrs) |
f8e93a2e | 4399 | { |
4400 | tree decl = NULL_TREE; | |
4401 | tree *type = NULL; | |
4402 | int is_type = 0; | |
4403 | tree align_expr = (args ? TREE_VALUE (args) | |
4404 | : size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); | |
4405 | int i; | |
4406 | ||
4407 | if (DECL_P (*node)) | |
4408 | { | |
4409 | decl = *node; | |
4410 | type = &TREE_TYPE (decl); | |
4411 | is_type = TREE_CODE (*node) == TYPE_DECL; | |
4412 | } | |
4413 | else if (TYPE_P (*node)) | |
4414 | type = node, is_type = 1; | |
4415 | ||
4416 | /* Strip any NOPs of any kind. */ | |
4417 | while (TREE_CODE (align_expr) == NOP_EXPR | |
4418 | || TREE_CODE (align_expr) == CONVERT_EXPR | |
4419 | || TREE_CODE (align_expr) == NON_LVALUE_EXPR) | |
4420 | align_expr = TREE_OPERAND (align_expr, 0); | |
4421 | ||
4422 | if (TREE_CODE (align_expr) != INTEGER_CST) | |
4423 | { | |
4424 | error ("requested alignment is not a constant"); | |
4425 | *no_add_attrs = true; | |
4426 | } | |
4427 | else if ((i = tree_log2 (align_expr)) == -1) | |
4428 | { | |
4429 | error ("requested alignment is not a power of 2"); | |
4430 | *no_add_attrs = true; | |
4431 | } | |
4432 | else if (i > HOST_BITS_PER_INT - 2) | |
4433 | { | |
4434 | error ("requested alignment is too large"); | |
4435 | *no_add_attrs = true; | |
4436 | } | |
4437 | else if (is_type) | |
4438 | { | |
4439 | /* If we have a TYPE_DECL, then copy the type, so that we | |
4440 | don't accidentally modify a builtin type. See pushdecl. */ | |
4441 | if (decl && TREE_TYPE (decl) != error_mark_node | |
4442 | && DECL_ORIGINAL_TYPE (decl) == NULL_TREE) | |
4443 | { | |
4444 | tree tt = TREE_TYPE (decl); | |
4445 | *type = build_type_copy (*type); | |
4446 | DECL_ORIGINAL_TYPE (decl) = tt; | |
4447 | TYPE_NAME (*type) = decl; | |
4448 | TREE_USED (*type) = TREE_USED (decl); | |
4449 | TREE_TYPE (decl) = *type; | |
4450 | } | |
4451 | else if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
4452 | *type = build_type_copy (*type); | |
4453 | ||
4454 | TYPE_ALIGN (*type) = (1 << i) * BITS_PER_UNIT; | |
4455 | TYPE_USER_ALIGN (*type) = 1; | |
4456 | } | |
4457 | else if (TREE_CODE (decl) != VAR_DECL | |
4458 | && TREE_CODE (decl) != FIELD_DECL) | |
4459 | { | |
9bc3739f | 4460 | error ("%Jalignment may not be specified for '%D'", decl, decl); |
f8e93a2e | 4461 | *no_add_attrs = true; |
4462 | } | |
4463 | else | |
4464 | { | |
4465 | DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT; | |
4466 | DECL_USER_ALIGN (decl) = 1; | |
4467 | } | |
4468 | ||
4469 | return NULL_TREE; | |
4470 | } | |
4471 | ||
4472 | /* Handle a "weak" attribute; arguments as in | |
4473 | struct attribute_spec.handler. */ | |
4474 | ||
4475 | static tree | |
9a03a746 | 4476 | handle_weak_attribute (tree *node, tree ARG_UNUSED (name), |
4477 | tree ARG_UNUSED (args), | |
4478 | int ARG_UNUSED (flags), | |
4479 | bool * ARG_UNUSED (no_add_attrs)) | |
f8e93a2e | 4480 | { |
4481 | declare_weak (*node); | |
4482 | ||
4483 | return NULL_TREE; | |
4484 | } | |
4485 | ||
4486 | /* Handle an "alias" attribute; arguments as in | |
4487 | struct attribute_spec.handler. */ | |
4488 | ||
4489 | static tree | |
1cae46be | 4490 | handle_alias_attribute (tree *node, tree name, tree args, |
9a03a746 | 4491 | int ARG_UNUSED (flags), bool *no_add_attrs) |
f8e93a2e | 4492 | { |
4493 | tree decl = *node; | |
4494 | ||
4495 | if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl)) | |
4496 | || (TREE_CODE (decl) != FUNCTION_DECL && ! DECL_EXTERNAL (decl))) | |
4497 | { | |
9bc3739f | 4498 | error ("%J'%D' defined both normally and as an alias", decl, decl); |
f8e93a2e | 4499 | *no_add_attrs = true; |
4500 | } | |
8c42f0d9 | 4501 | |
4502 | /* Note that the very first time we process a nested declaration, | |
4503 | decl_function_context will not be set. Indeed, *would* never | |
4504 | be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that | |
4505 | we do below. After such frobbery, pushdecl would set the context. | |
4506 | In any case, this is never what we want. */ | |
4507 | else if (decl_function_context (decl) == 0 && current_function_decl == NULL) | |
f8e93a2e | 4508 | { |
4509 | tree id; | |
4510 | ||
4511 | id = TREE_VALUE (args); | |
4512 | if (TREE_CODE (id) != STRING_CST) | |
4513 | { | |
4514 | error ("alias arg not a string"); | |
4515 | *no_add_attrs = true; | |
4516 | return NULL_TREE; | |
4517 | } | |
4518 | id = get_identifier (TREE_STRING_POINTER (id)); | |
4519 | /* This counts as a use of the object pointed to. */ | |
4520 | TREE_USED (id) = 1; | |
4521 | ||
4522 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
4523 | DECL_INITIAL (decl) = error_mark_node; | |
4524 | else | |
4ee9c684 | 4525 | { |
4526 | DECL_EXTERNAL (decl) = 0; | |
4527 | TREE_STATIC (decl) = 1; | |
4528 | } | |
f8e93a2e | 4529 | } |
4530 | else | |
4531 | { | |
4532 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4533 | *no_add_attrs = true; | |
4534 | } | |
4535 | ||
4536 | return NULL_TREE; | |
4537 | } | |
4538 | ||
4539 | /* Handle an "visibility" attribute; arguments as in | |
4540 | struct attribute_spec.handler. */ | |
4541 | ||
4542 | static tree | |
1cae46be | 4543 | handle_visibility_attribute (tree *node, tree name, tree args, |
9a03a746 | 4544 | int ARG_UNUSED (flags), |
09347743 | 4545 | bool *no_add_attrs) |
f8e93a2e | 4546 | { |
4547 | tree decl = *node; | |
9c40570a | 4548 | tree id = TREE_VALUE (args); |
4549 | ||
4550 | *no_add_attrs = true; | |
f8e93a2e | 4551 | |
b212f378 | 4552 | if (TYPE_P (*node)) |
4553 | { | |
4554 | if (TREE_CODE (*node) != RECORD_TYPE && TREE_CODE (*node) != UNION_TYPE) | |
4555 | { | |
4556 | warning ("`%s' attribute ignored on non-class types", | |
4557 | IDENTIFIER_POINTER (name)); | |
4558 | return NULL_TREE; | |
4559 | } | |
4560 | } | |
4561 | else if (decl_function_context (decl) != 0 || ! TREE_PUBLIC (decl)) | |
f8e93a2e | 4562 | { |
4563 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
9c40570a | 4564 | return NULL_TREE; |
f8e93a2e | 4565 | } |
f8e93a2e | 4566 | |
9c40570a | 4567 | if (TREE_CODE (id) != STRING_CST) |
4568 | { | |
4569 | error ("visibility arg not a string"); | |
4570 | return NULL_TREE; | |
f8e93a2e | 4571 | } |
b27ac6b5 | 4572 | |
b212f378 | 4573 | /* If this is a type, set the visibility on the type decl. */ |
4574 | if (TYPE_P (decl)) | |
4575 | { | |
4576 | decl = TYPE_NAME (decl); | |
4577 | if (! decl) | |
4578 | return NULL_TREE; | |
4579 | } | |
f8e93a2e | 4580 | |
9c40570a | 4581 | if (strcmp (TREE_STRING_POINTER (id), "default") == 0) |
4582 | DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT; | |
4583 | else if (strcmp (TREE_STRING_POINTER (id), "internal") == 0) | |
4584 | DECL_VISIBILITY (decl) = VISIBILITY_INTERNAL; | |
4585 | else if (strcmp (TREE_STRING_POINTER (id), "hidden") == 0) | |
b27ac6b5 | 4586 | DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN; |
9c40570a | 4587 | else if (strcmp (TREE_STRING_POINTER (id), "protected") == 0) |
4588 | DECL_VISIBILITY (decl) = VISIBILITY_PROTECTED; | |
4589 | else | |
4590 | error ("visibility arg must be one of \"default\", \"hidden\", \"protected\" or \"internal\""); | |
b212f378 | 4591 | DECL_VISIBILITY_SPECIFIED (decl) = 1; |
4592 | ||
4593 | /* For decls only, go ahead and attach the attribute to the node as well. | |
4594 | This is needed so we can determine whether we have VISIBILITY_DEFAULT | |
4595 | because the visibility was not specified, or because it was explicitly | |
4596 | overridden from the class visibility. */ | |
4597 | if (DECL_P (*node)) | |
4598 | *no_add_attrs = false; | |
9c40570a | 4599 | |
f8e93a2e | 4600 | return NULL_TREE; |
4601 | } | |
4602 | ||
3aa0c315 | 4603 | /* Determine the ELF symbol visibility for DECL, which is either a |
4604 | variable or a function. It is an error to use this function if a | |
4605 | definition of DECL is not available in this translation unit. | |
4606 | Returns true if the final visibility has been determined by this | |
4607 | function; false if the caller is free to make additional | |
4608 | modifications. */ | |
4609 | ||
4610 | bool | |
4611 | c_determine_visibility (tree decl) | |
4612 | { | |
4613 | my_friendly_assert (TREE_CODE (decl) == VAR_DECL | |
4614 | || TREE_CODE (decl) == FUNCTION_DECL, | |
4615 | 20040805); | |
4616 | ||
4617 | /* If the user explicitly specified the visibility with an | |
4618 | attribute, honor that. DECL_VISIBILITY will have been set during | |
4619 | the processing of the attribute. We check for an explicit | |
4620 | attribute, rather than just checking DECL_VISIBILITY_SPECIFIED, | |
4621 | to distinguish the use of an attribute from the use of a "#pragma | |
4622 | GCC visibility push(...)"; in the latter case we still want other | |
4623 | considerations to be able to overrule the #pragma. */ | |
4624 | if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl))) | |
4625 | return true; | |
4626 | ||
4627 | /* Anything that is exported must have default visibility. */ | |
4628 | if (TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
4629 | && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl))) | |
4630 | { | |
4631 | DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT; | |
4632 | DECL_VISIBILITY_SPECIFIED (decl) = 1; | |
4633 | return true; | |
4634 | } | |
4635 | ||
4636 | return false; | |
4637 | } | |
4638 | ||
24dfead4 | 4639 | /* Handle an "tls_model" attribute; arguments as in |
4640 | struct attribute_spec.handler. */ | |
4641 | ||
4642 | static tree | |
1cae46be | 4643 | handle_tls_model_attribute (tree *node, tree name, tree args, |
9a03a746 | 4644 | int ARG_UNUSED (flags), bool *no_add_attrs) |
24dfead4 | 4645 | { |
4646 | tree decl = *node; | |
4647 | ||
4648 | if (! DECL_THREAD_LOCAL (decl)) | |
4649 | { | |
4650 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4651 | *no_add_attrs = true; | |
4652 | } | |
4653 | else | |
4654 | { | |
4655 | tree id; | |
4656 | ||
4657 | id = TREE_VALUE (args); | |
4658 | if (TREE_CODE (id) != STRING_CST) | |
4659 | { | |
4660 | error ("tls_model arg not a string"); | |
4661 | *no_add_attrs = true; | |
4662 | return NULL_TREE; | |
4663 | } | |
4664 | if (strcmp (TREE_STRING_POINTER (id), "local-exec") | |
4665 | && strcmp (TREE_STRING_POINTER (id), "initial-exec") | |
4666 | && strcmp (TREE_STRING_POINTER (id), "local-dynamic") | |
4667 | && strcmp (TREE_STRING_POINTER (id), "global-dynamic")) | |
4668 | { | |
4669 | error ("tls_model arg must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\""); | |
4670 | *no_add_attrs = true; | |
4671 | return NULL_TREE; | |
4672 | } | |
4673 | } | |
4674 | ||
4675 | return NULL_TREE; | |
4676 | } | |
4677 | ||
f8e93a2e | 4678 | /* Handle a "no_instrument_function" attribute; arguments as in |
4679 | struct attribute_spec.handler. */ | |
4680 | ||
4681 | static tree | |
1cae46be | 4682 | handle_no_instrument_function_attribute (tree *node, tree name, |
9a03a746 | 4683 | tree ARG_UNUSED (args), |
4684 | int ARG_UNUSED (flags), | |
09347743 | 4685 | bool *no_add_attrs) |
f8e93a2e | 4686 | { |
4687 | tree decl = *node; | |
4688 | ||
4689 | if (TREE_CODE (decl) != FUNCTION_DECL) | |
4690 | { | |
9bc3739f | 4691 | error ("%J'%E' attribute applies only to functions", decl, name); |
f8e93a2e | 4692 | *no_add_attrs = true; |
4693 | } | |
4694 | else if (DECL_INITIAL (decl)) | |
4695 | { | |
9bc3739f | 4696 | error ("%Jcan't set '%E' attribute after definition", decl, name); |
f8e93a2e | 4697 | *no_add_attrs = true; |
4698 | } | |
4699 | else | |
4700 | DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1; | |
4701 | ||
4702 | return NULL_TREE; | |
4703 | } | |
4704 | ||
4705 | /* Handle a "malloc" attribute; arguments as in | |
4706 | struct attribute_spec.handler. */ | |
4707 | ||
4708 | static tree | |
9a03a746 | 4709 | handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
4710 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4711 | { |
4712 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4713 | DECL_IS_MALLOC (*node) = 1; | |
4714 | /* ??? TODO: Support types. */ | |
4715 | else | |
4716 | { | |
4717 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4718 | *no_add_attrs = true; | |
4719 | } | |
4720 | ||
4721 | return NULL_TREE; | |
4722 | } | |
4723 | ||
4724 | /* Handle a "no_limit_stack" attribute; arguments as in | |
4725 | struct attribute_spec.handler. */ | |
4726 | ||
4727 | static tree | |
1cae46be | 4728 | handle_no_limit_stack_attribute (tree *node, tree name, |
9a03a746 | 4729 | tree ARG_UNUSED (args), |
4730 | int ARG_UNUSED (flags), | |
09347743 | 4731 | bool *no_add_attrs) |
f8e93a2e | 4732 | { |
4733 | tree decl = *node; | |
4734 | ||
4735 | if (TREE_CODE (decl) != FUNCTION_DECL) | |
4736 | { | |
9bc3739f | 4737 | error ("%J'%E' attribute applies only to functions", decl, name); |
f8e93a2e | 4738 | *no_add_attrs = true; |
4739 | } | |
4740 | else if (DECL_INITIAL (decl)) | |
4741 | { | |
9bc3739f | 4742 | error ("%Jcan't set '%E' attribute after definition", decl, name); |
f8e93a2e | 4743 | *no_add_attrs = true; |
4744 | } | |
4745 | else | |
4746 | DECL_NO_LIMIT_STACK (decl) = 1; | |
4747 | ||
4748 | return NULL_TREE; | |
4749 | } | |
4750 | ||
4751 | /* Handle a "pure" attribute; arguments as in | |
4752 | struct attribute_spec.handler. */ | |
4753 | ||
4754 | static tree | |
9a03a746 | 4755 | handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
4756 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
f8e93a2e | 4757 | { |
4758 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
4759 | DECL_IS_PURE (*node) = 1; | |
4760 | /* ??? TODO: Support types. */ | |
4761 | else | |
4762 | { | |
4763 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4764 | *no_add_attrs = true; | |
4765 | } | |
4766 | ||
4767 | return NULL_TREE; | |
4768 | } | |
4769 | ||
4770 | /* Handle a "deprecated" attribute; arguments as in | |
4771 | struct attribute_spec.handler. */ | |
1cae46be | 4772 | |
f8e93a2e | 4773 | static tree |
1cae46be | 4774 | handle_deprecated_attribute (tree *node, tree name, |
9a03a746 | 4775 | tree ARG_UNUSED (args), int flags, |
09347743 | 4776 | bool *no_add_attrs) |
f8e93a2e | 4777 | { |
4778 | tree type = NULL_TREE; | |
4779 | int warn = 0; | |
4780 | const char *what = NULL; | |
1cae46be | 4781 | |
f8e93a2e | 4782 | if (DECL_P (*node)) |
4783 | { | |
4784 | tree decl = *node; | |
4785 | type = TREE_TYPE (decl); | |
1cae46be | 4786 | |
f8e93a2e | 4787 | if (TREE_CODE (decl) == TYPE_DECL |
4788 | || TREE_CODE (decl) == PARM_DECL | |
4789 | || TREE_CODE (decl) == VAR_DECL | |
4790 | || TREE_CODE (decl) == FUNCTION_DECL | |
4791 | || TREE_CODE (decl) == FIELD_DECL) | |
4792 | TREE_DEPRECATED (decl) = 1; | |
4793 | else | |
4794 | warn = 1; | |
4795 | } | |
4796 | else if (TYPE_P (*node)) | |
4797 | { | |
4798 | if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
4799 | *node = build_type_copy (*node); | |
4800 | TREE_DEPRECATED (*node) = 1; | |
4801 | type = *node; | |
4802 | } | |
4803 | else | |
4804 | warn = 1; | |
1cae46be | 4805 | |
f8e93a2e | 4806 | if (warn) |
4807 | { | |
4808 | *no_add_attrs = true; | |
4809 | if (type && TYPE_NAME (type)) | |
4810 | { | |
4811 | if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
4812 | what = IDENTIFIER_POINTER (TYPE_NAME (*node)); | |
4813 | else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL | |
4814 | && DECL_NAME (TYPE_NAME (type))) | |
4815 | what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))); | |
4816 | } | |
4817 | if (what) | |
4818 | warning ("`%s' attribute ignored for `%s'", | |
4819 | IDENTIFIER_POINTER (name), what); | |
4820 | else | |
1cae46be | 4821 | warning ("`%s' attribute ignored", |
f8e93a2e | 4822 | IDENTIFIER_POINTER (name)); |
4823 | } | |
4824 | ||
4825 | return NULL_TREE; | |
4826 | } | |
4827 | ||
f8e93a2e | 4828 | /* Handle a "vector_size" attribute; arguments as in |
4829 | struct attribute_spec.handler. */ | |
4830 | ||
4831 | static tree | |
1cae46be | 4832 | handle_vector_size_attribute (tree *node, tree name, tree args, |
9a03a746 | 4833 | int ARG_UNUSED (flags), |
09347743 | 4834 | bool *no_add_attrs) |
f8e93a2e | 4835 | { |
4836 | unsigned HOST_WIDE_INT vecsize, nunits; | |
83e2a11b | 4837 | enum machine_mode orig_mode; |
4917c376 | 4838 | tree type = *node, new_type, size; |
f8e93a2e | 4839 | |
4840 | *no_add_attrs = true; | |
4841 | ||
4917c376 | 4842 | /* Stripping NON_LVALUE_EXPR allows declarations such as |
4843 | typedef short v4si __attribute__((vector_size (4 * sizeof(short)))). */ | |
4844 | size = TREE_VALUE (args); | |
4845 | if (TREE_CODE (size) == NON_LVALUE_EXPR) | |
4846 | size = TREE_OPERAND (size, 0); | |
4847 | ||
4848 | if (! host_integerp (size, 1)) | |
f8e93a2e | 4849 | { |
4850 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
4851 | return NULL_TREE; | |
4852 | } | |
4853 | ||
4854 | /* Get the vector size (in bytes). */ | |
4917c376 | 4855 | vecsize = tree_low_cst (size, 1); |
f8e93a2e | 4856 | |
4857 | /* We need to provide for vector pointers, vector arrays, and | |
4858 | functions returning vectors. For example: | |
4859 | ||
4860 | __attribute__((vector_size(16))) short *foo; | |
4861 | ||
4862 | In this case, the mode is SI, but the type being modified is | |
4863 | HI, so we need to look further. */ | |
4864 | ||
4865 | while (POINTER_TYPE_P (type) | |
4866 | || TREE_CODE (type) == FUNCTION_TYPE | |
5bfb0742 | 4867 | || TREE_CODE (type) == METHOD_TYPE |
f8e93a2e | 4868 | || TREE_CODE (type) == ARRAY_TYPE) |
4869 | type = TREE_TYPE (type); | |
4870 | ||
4871 | /* Get the mode of the type being modified. */ | |
4872 | orig_mode = TYPE_MODE (type); | |
4873 | ||
4874 | if (TREE_CODE (type) == RECORD_TYPE | |
4875 | || (GET_MODE_CLASS (orig_mode) != MODE_FLOAT | |
4876 | && GET_MODE_CLASS (orig_mode) != MODE_INT) | |
4877 | || ! host_integerp (TYPE_SIZE_UNIT (type), 1)) | |
4878 | { | |
4879 | error ("invalid vector type for attribute `%s'", | |
4880 | IDENTIFIER_POINTER (name)); | |
4881 | return NULL_TREE; | |
4882 | } | |
4883 | ||
4884 | /* Calculate how many units fit in the vector. */ | |
4885 | nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1); | |
83e2a11b | 4886 | if (nunits & (nunits - 1)) |
f8e93a2e | 4887 | { |
83e2a11b | 4888 | error ("number of components of the vector not a power of two"); |
f8e93a2e | 4889 | return NULL_TREE; |
4890 | } | |
4891 | ||
83e2a11b | 4892 | new_type = build_vector_type (type, nunits); |
f8e93a2e | 4893 | |
4894 | /* Build back pointers if needed. */ | |
409a160c | 4895 | *node = reconstruct_complex_type (*node, new_type); |
f8e93a2e | 4896 | |
4897 | return NULL_TREE; | |
4898 | } | |
4899 | ||
dbf6c367 | 4900 | /* Handle the "nonnull" attribute. */ |
4901 | static tree | |
9a03a746 | 4902 | handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name), |
4903 | tree args, int ARG_UNUSED (flags), | |
09347743 | 4904 | bool *no_add_attrs) |
dbf6c367 | 4905 | { |
4906 | tree type = *node; | |
4907 | unsigned HOST_WIDE_INT attr_arg_num; | |
4908 | ||
4909 | /* If no arguments are specified, all pointer arguments should be | |
d716ce75 | 4910 | non-null. Verify a full prototype is given so that the arguments |
dbf6c367 | 4911 | will have the correct types when we actually check them later. */ |
4912 | if (! args) | |
4913 | { | |
4914 | if (! TYPE_ARG_TYPES (type)) | |
4915 | { | |
4916 | error ("nonnull attribute without arguments on a non-prototype"); | |
4ee9c684 | 4917 | *no_add_attrs = true; |
dbf6c367 | 4918 | } |
4919 | return NULL_TREE; | |
4920 | } | |
4921 | ||
4922 | /* Argument list specified. Verify that each argument number references | |
4923 | a pointer argument. */ | |
4924 | for (attr_arg_num = 1; args; args = TREE_CHAIN (args)) | |
4925 | { | |
4926 | tree argument; | |
4ee9c684 | 4927 | unsigned HOST_WIDE_INT arg_num = 0, ck_num; |
dbf6c367 | 4928 | |
4929 | if (! get_nonnull_operand (TREE_VALUE (args), &arg_num)) | |
4930 | { | |
4931 | error ("nonnull argument has invalid operand number (arg %lu)", | |
4932 | (unsigned long) attr_arg_num); | |
4933 | *no_add_attrs = true; | |
4934 | return NULL_TREE; | |
4935 | } | |
4936 | ||
4937 | argument = TYPE_ARG_TYPES (type); | |
4938 | if (argument) | |
4939 | { | |
4940 | for (ck_num = 1; ; ck_num++) | |
4941 | { | |
4942 | if (! argument || ck_num == arg_num) | |
4943 | break; | |
4944 | argument = TREE_CHAIN (argument); | |
4945 | } | |
4946 | ||
4ee9c684 | 4947 | if (! argument |
dbf6c367 | 4948 | || TREE_CODE (TREE_VALUE (argument)) == VOID_TYPE) |
4949 | { | |
4950 | error ("nonnull argument with out-of-range operand number (arg %lu, operand %lu)", | |
4951 | (unsigned long) attr_arg_num, (unsigned long) arg_num); | |
4952 | *no_add_attrs = true; | |
4953 | return NULL_TREE; | |
4954 | } | |
4955 | ||
4ee9c684 | 4956 | if (TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE) |
dbf6c367 | 4957 | { |
4958 | error ("nonnull argument references non-pointer operand (arg %lu, operand %lu)", | |
4959 | (unsigned long) attr_arg_num, (unsigned long) arg_num); | |
4960 | *no_add_attrs = true; | |
4961 | return NULL_TREE; | |
4962 | } | |
4963 | } | |
4964 | } | |
4965 | ||
4966 | return NULL_TREE; | |
4967 | } | |
4968 | ||
4969 | /* Check the argument list of a function call for null in argument slots | |
4970 | that are marked as requiring a non-null pointer argument. */ | |
4971 | ||
4972 | static void | |
1cae46be | 4973 | check_function_nonnull (tree attrs, tree params) |
dbf6c367 | 4974 | { |
4975 | tree a, args, param; | |
4976 | int param_num; | |
4977 | ||
4978 | for (a = attrs; a; a = TREE_CHAIN (a)) | |
4979 | { | |
4980 | if (is_attribute_p ("nonnull", TREE_PURPOSE (a))) | |
4981 | { | |
4ee9c684 | 4982 | args = TREE_VALUE (a); |
dbf6c367 | 4983 | |
4ee9c684 | 4984 | /* Walk the argument list. If we encounter an argument number we |
4985 | should check for non-null, do it. If the attribute has no args, | |
4986 | then every pointer argument is checked (in which case the check | |
dbf6c367 | 4987 | for pointer type is done in check_nonnull_arg). */ |
4ee9c684 | 4988 | for (param = params, param_num = 1; ; |
4989 | param_num++, param = TREE_CHAIN (param)) | |
4990 | { | |
4991 | if (! param) | |
1cae46be | 4992 | break; |
4ee9c684 | 4993 | if (! args || nonnull_check_p (args, param_num)) |
1cae46be | 4994 | check_function_arguments_recurse (check_nonnull_arg, NULL, |
4995 | TREE_VALUE (param), | |
4996 | param_num); | |
4ee9c684 | 4997 | } |
dbf6c367 | 4998 | } |
4999 | } | |
5000 | } | |
5001 | ||
5002 | /* Helper for check_function_nonnull; given a list of operands which | |
5003 | must be non-null in ARGS, determine if operand PARAM_NUM should be | |
5004 | checked. */ | |
5005 | ||
5006 | static bool | |
1cae46be | 5007 | nonnull_check_p (tree args, unsigned HOST_WIDE_INT param_num) |
dbf6c367 | 5008 | { |
4ee9c684 | 5009 | unsigned HOST_WIDE_INT arg_num = 0; |
dbf6c367 | 5010 | |
5011 | for (; args; args = TREE_CHAIN (args)) | |
5012 | { | |
5013 | if (! get_nonnull_operand (TREE_VALUE (args), &arg_num)) | |
4ee9c684 | 5014 | abort (); |
dbf6c367 | 5015 | |
5016 | if (arg_num == param_num) | |
5017 | return true; | |
5018 | } | |
5019 | return false; | |
5020 | } | |
5021 | ||
5022 | /* Check that the function argument PARAM (which is operand number | |
5023 | PARAM_NUM) is non-null. This is called by check_function_nonnull | |
5024 | via check_function_arguments_recurse. */ | |
5025 | ||
5026 | static void | |
9a03a746 | 5027 | check_nonnull_arg (void * ARG_UNUSED (ctx), tree param, |
1cae46be | 5028 | unsigned HOST_WIDE_INT param_num) |
dbf6c367 | 5029 | { |
5030 | /* Just skip checking the argument if it's not a pointer. This can | |
5031 | happen if the "nonnull" attribute was given without an operand | |
5032 | list (which means to check every pointer argument). */ | |
5033 | ||
5034 | if (TREE_CODE (TREE_TYPE (param)) != POINTER_TYPE) | |
5035 | return; | |
5036 | ||
5037 | if (integer_zerop (param)) | |
5038 | warning ("null argument where non-null required (arg %lu)", | |
4ee9c684 | 5039 | (unsigned long) param_num); |
dbf6c367 | 5040 | } |
5041 | ||
5042 | /* Helper for nonnull attribute handling; fetch the operand number | |
5043 | from the attribute argument list. */ | |
5044 | ||
5045 | static bool | |
1cae46be | 5046 | get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp) |
dbf6c367 | 5047 | { |
5048 | /* Strip any conversions from the arg number and verify they | |
5049 | are constants. */ | |
5050 | while (TREE_CODE (arg_num_expr) == NOP_EXPR | |
5051 | || TREE_CODE (arg_num_expr) == CONVERT_EXPR | |
5052 | || TREE_CODE (arg_num_expr) == NON_LVALUE_EXPR) | |
5053 | arg_num_expr = TREE_OPERAND (arg_num_expr, 0); | |
5054 | ||
5055 | if (TREE_CODE (arg_num_expr) != INTEGER_CST | |
5056 | || TREE_INT_CST_HIGH (arg_num_expr) != 0) | |
5057 | return false; | |
5058 | ||
5059 | *valp = TREE_INT_CST_LOW (arg_num_expr); | |
5060 | return true; | |
5061 | } | |
fa987697 | 5062 | |
5063 | /* Handle a "nothrow" attribute; arguments as in | |
5064 | struct attribute_spec.handler. */ | |
5065 | ||
5066 | static tree | |
9a03a746 | 5067 | handle_nothrow_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
5068 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
fa987697 | 5069 | { |
5070 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5071 | TREE_NOTHROW (*node) = 1; | |
5072 | /* ??? TODO: Support types. */ | |
5073 | else | |
5074 | { | |
5075 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
5076 | *no_add_attrs = true; | |
5077 | } | |
5078 | ||
5079 | return NULL_TREE; | |
5080 | } | |
7acb29a3 | 5081 | |
5082 | /* Handle a "cleanup" attribute; arguments as in | |
5083 | struct attribute_spec.handler. */ | |
5084 | ||
5085 | static tree | |
1cae46be | 5086 | handle_cleanup_attribute (tree *node, tree name, tree args, |
9a03a746 | 5087 | int ARG_UNUSED (flags), bool *no_add_attrs) |
7acb29a3 | 5088 | { |
5089 | tree decl = *node; | |
5090 | tree cleanup_id, cleanup_decl; | |
5091 | ||
5092 | /* ??? Could perhaps support cleanups on TREE_STATIC, much like we do | |
5093 | for global destructors in C++. This requires infrastructure that | |
5094 | we don't have generically at the moment. It's also not a feature | |
5095 | we'd be missing too much, since we do have attribute constructor. */ | |
5096 | if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)) | |
5097 | { | |
5098 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
5099 | *no_add_attrs = true; | |
5100 | return NULL_TREE; | |
5101 | } | |
5102 | ||
5103 | /* Verify that the argument is a function in scope. */ | |
5104 | /* ??? We could support pointers to functions here as well, if | |
5105 | that was considered desirable. */ | |
5106 | cleanup_id = TREE_VALUE (args); | |
5107 | if (TREE_CODE (cleanup_id) != IDENTIFIER_NODE) | |
5108 | { | |
5109 | error ("cleanup arg not an identifier"); | |
5110 | *no_add_attrs = true; | |
5111 | return NULL_TREE; | |
5112 | } | |
5113 | cleanup_decl = lookup_name (cleanup_id); | |
5114 | if (!cleanup_decl || TREE_CODE (cleanup_decl) != FUNCTION_DECL) | |
5115 | { | |
5116 | error ("cleanup arg not a function"); | |
5117 | *no_add_attrs = true; | |
5118 | return NULL_TREE; | |
5119 | } | |
5120 | ||
1cae46be | 5121 | /* That the function has proper type is checked with the |
7acb29a3 | 5122 | eventual call to build_function_call. */ |
5123 | ||
5124 | return NULL_TREE; | |
5125 | } | |
8a8cdb8d | 5126 | |
5127 | /* Handle a "warn_unused_result" attribute. No special handling. */ | |
5128 | ||
5129 | static tree | |
5130 | handle_warn_unused_result_attribute (tree *node, tree name, | |
9a03a746 | 5131 | tree ARG_UNUSED (args), |
5132 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
8a8cdb8d | 5133 | { |
5134 | /* Ignore the attribute for functions not returning any value. */ | |
5135 | if (VOID_TYPE_P (TREE_TYPE (*node))) | |
5136 | { | |
5137 | warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); | |
5138 | *no_add_attrs = true; | |
5139 | } | |
5140 | ||
5141 | return NULL_TREE; | |
5142 | } | |
dbf6c367 | 5143 | \f |
5144 | /* Check for valid arguments being passed to a function. */ | |
5145 | void | |
1cae46be | 5146 | check_function_arguments (tree attrs, tree params) |
dbf6c367 | 5147 | { |
5148 | /* Check for null being passed in a pointer argument that must be | |
5149 | non-null. We also need to do this if format checking is enabled. */ | |
5150 | ||
5151 | if (warn_nonnull) | |
5152 | check_function_nonnull (attrs, params); | |
5153 | ||
5154 | /* Check for errors in format strings. */ | |
5155 | ||
5156 | if (warn_format) | |
1b1f2444 | 5157 | check_function_format (attrs, params); |
dbf6c367 | 5158 | } |
5159 | ||
5160 | /* Generic argument checking recursion routine. PARAM is the argument to | |
5161 | be checked. PARAM_NUM is the number of the argument. CALLBACK is invoked | |
5162 | once the argument is resolved. CTX is context for the callback. */ | |
5163 | void | |
1cae46be | 5164 | check_function_arguments_recurse (void (*callback) |
5165 | (void *, tree, unsigned HOST_WIDE_INT), | |
5166 | void *ctx, tree param, | |
5167 | unsigned HOST_WIDE_INT param_num) | |
dbf6c367 | 5168 | { |
5169 | if (TREE_CODE (param) == NOP_EXPR) | |
5170 | { | |
5171 | /* Strip coercion. */ | |
5172 | check_function_arguments_recurse (callback, ctx, | |
4ee9c684 | 5173 | TREE_OPERAND (param, 0), param_num); |
dbf6c367 | 5174 | return; |
5175 | } | |
5176 | ||
5177 | if (TREE_CODE (param) == CALL_EXPR) | |
5178 | { | |
5179 | tree type = TREE_TYPE (TREE_TYPE (TREE_OPERAND (param, 0))); | |
5180 | tree attrs; | |
5181 | bool found_format_arg = false; | |
5182 | ||
5183 | /* See if this is a call to a known internationalization function | |
5184 | that modifies a format arg. Such a function may have multiple | |
5185 | format_arg attributes (for example, ngettext). */ | |
5186 | ||
5187 | for (attrs = TYPE_ATTRIBUTES (type); | |
5188 | attrs; | |
5189 | attrs = TREE_CHAIN (attrs)) | |
5190 | if (is_attribute_p ("format_arg", TREE_PURPOSE (attrs))) | |
5191 | { | |
5192 | tree inner_args; | |
5193 | tree format_num_expr; | |
5194 | int format_num; | |
5195 | int i; | |
5196 | ||
5197 | /* Extract the argument number, which was previously checked | |
5198 | to be valid. */ | |
5199 | format_num_expr = TREE_VALUE (TREE_VALUE (attrs)); | |
5200 | while (TREE_CODE (format_num_expr) == NOP_EXPR | |
5201 | || TREE_CODE (format_num_expr) == CONVERT_EXPR | |
5202 | || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR) | |
5203 | format_num_expr = TREE_OPERAND (format_num_expr, 0); | |
5204 | ||
5205 | if (TREE_CODE (format_num_expr) != INTEGER_CST | |
5206 | || TREE_INT_CST_HIGH (format_num_expr) != 0) | |
5207 | abort (); | |
5208 | ||
5209 | format_num = TREE_INT_CST_LOW (format_num_expr); | |
5210 | ||
5211 | for (inner_args = TREE_OPERAND (param, 1), i = 1; | |
5212 | inner_args != 0; | |
5213 | inner_args = TREE_CHAIN (inner_args), i++) | |
5214 | if (i == format_num) | |
5215 | { | |
5216 | check_function_arguments_recurse (callback, ctx, | |
5217 | TREE_VALUE (inner_args), | |
5218 | param_num); | |
5219 | found_format_arg = true; | |
5220 | break; | |
5221 | } | |
5222 | } | |
5223 | ||
5224 | /* If we found a format_arg attribute and did a recursive check, | |
5225 | we are done with checking this argument. Otherwise, we continue | |
5226 | and this will be considered a non-literal. */ | |
5227 | if (found_format_arg) | |
5228 | return; | |
5229 | } | |
5230 | ||
5231 | if (TREE_CODE (param) == COND_EXPR) | |
5232 | { | |
5233 | /* Check both halves of the conditional expression. */ | |
5234 | check_function_arguments_recurse (callback, ctx, | |
4ee9c684 | 5235 | TREE_OPERAND (param, 1), param_num); |
dbf6c367 | 5236 | check_function_arguments_recurse (callback, ctx, |
4ee9c684 | 5237 | TREE_OPERAND (param, 2), param_num); |
dbf6c367 | 5238 | return; |
5239 | } | |
5240 | ||
5241 | (*callback) (ctx, param, param_num); | |
5242 | } | |
1f3233d1 | 5243 | |
860251be | 5244 | /* Function to help qsort sort FIELD_DECLs by name order. */ |
5245 | ||
5246 | int | |
5247 | field_decl_cmp (const void *x_p, const void *y_p) | |
5248 | { | |
4fd61bc6 | 5249 | const tree *const x = (const tree *const) x_p; |
5250 | const tree *const y = (const tree *const) y_p; | |
5251 | ||
860251be | 5252 | if (DECL_NAME (*x) == DECL_NAME (*y)) |
5253 | /* A nontype is "greater" than a type. */ | |
5254 | return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL); | |
5255 | if (DECL_NAME (*x) == NULL_TREE) | |
5256 | return -1; | |
5257 | if (DECL_NAME (*y) == NULL_TREE) | |
5258 | return 1; | |
5259 | if (DECL_NAME (*x) < DECL_NAME (*y)) | |
5260 | return -1; | |
5261 | return 1; | |
5262 | } | |
5263 | ||
5264 | static struct { | |
5265 | gt_pointer_operator new_value; | |
5266 | void *cookie; | |
5267 | } resort_data; | |
5268 | ||
5269 | /* This routine compares two fields like field_decl_cmp but using the | |
5270 | pointer operator in resort_data. */ | |
5271 | ||
5272 | static int | |
5273 | resort_field_decl_cmp (const void *x_p, const void *y_p) | |
5274 | { | |
4fd61bc6 | 5275 | const tree *const x = (const tree *const) x_p; |
5276 | const tree *const y = (const tree *const) y_p; | |
860251be | 5277 | |
5278 | if (DECL_NAME (*x) == DECL_NAME (*y)) | |
5279 | /* A nontype is "greater" than a type. */ | |
5280 | return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL); | |
5281 | if (DECL_NAME (*x) == NULL_TREE) | |
5282 | return -1; | |
5283 | if (DECL_NAME (*y) == NULL_TREE) | |
5284 | return 1; | |
5285 | { | |
5286 | tree d1 = DECL_NAME (*x); | |
5287 | tree d2 = DECL_NAME (*y); | |
5288 | resort_data.new_value (&d1, resort_data.cookie); | |
5289 | resort_data.new_value (&d2, resort_data.cookie); | |
5290 | if (d1 < d2) | |
5291 | return -1; | |
5292 | } | |
5293 | return 1; | |
5294 | } | |
5295 | ||
5296 | /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */ | |
5297 | ||
5298 | void | |
5299 | resort_sorted_fields (void *obj, | |
9a03a746 | 5300 | void * ARG_UNUSED (orig_obj), |
4ee9c684 | 5301 | gt_pointer_operator new_value, |
5302 | void *cookie) | |
860251be | 5303 | { |
9a03a746 | 5304 | struct sorted_fields_type *sf = (struct sorted_fields_type *) obj; |
860251be | 5305 | resort_data.new_value = new_value; |
5306 | resort_data.cookie = cookie; | |
5307 | qsort (&sf->elts[0], sf->len, sizeof (tree), | |
4ee9c684 | 5308 | resort_field_decl_cmp); |
860251be | 5309 | } |
5310 | ||
92b128ed | 5311 | /* Issue the error given by MSGID, indicating that it occurred before |
5312 | TOKEN, which had the associated VALUE. */ | |
5313 | ||
5314 | void | |
5315 | c_parse_error (const char *msgid, enum cpp_ttype token, tree value) | |
5316 | { | |
5317 | const char *string = _(msgid); | |
5318 | ||
5319 | if (token == CPP_EOF) | |
5320 | error ("%s at end of input", string); | |
5321 | else if (token == CPP_CHAR || token == CPP_WCHAR) | |
5322 | { | |
5323 | unsigned int val = TREE_INT_CST_LOW (value); | |
5324 | const char *const ell = (token == CPP_CHAR) ? "" : "L"; | |
5325 | if (val <= UCHAR_MAX && ISGRAPH (val)) | |
5326 | error ("%s before %s'%c'", string, ell, val); | |
5327 | else | |
5328 | error ("%s before %s'\\x%x'", string, ell, val); | |
5329 | } | |
5330 | else if (token == CPP_STRING | |
5331 | || token == CPP_WSTRING) | |
5332 | error ("%s before string constant", string); | |
5333 | else if (token == CPP_NUMBER) | |
5334 | error ("%s before numeric constant", string); | |
5335 | else if (token == CPP_NAME) | |
5336 | error ("%s before \"%s\"", string, IDENTIFIER_POINTER (value)); | |
5337 | else if (token < N_TTYPES) | |
5338 | error ("%s before '%s' token", string, cpp_type2name (token)); | |
5339 | else | |
5340 | error ("%s", string); | |
5341 | } | |
5342 | ||
4ee9c684 | 5343 | /* Walk a gimplified function and warn for functions whose return value is |
5344 | ignored and attribute((warn_unused_result)) is set. This is done before | |
b27ac6b5 | 5345 | inlining, so we don't have to worry about that. */ |
5346 | ||
4ee9c684 | 5347 | void |
5348 | c_warn_unused_result (tree *top_p) | |
5349 | { | |
5350 | tree t = *top_p; | |
5351 | tree_stmt_iterator i; | |
5352 | tree fdecl, ftype; | |
5353 | ||
5354 | switch (TREE_CODE (t)) | |
5355 | { | |
5356 | case STATEMENT_LIST: | |
5357 | for (i = tsi_start (*top_p); !tsi_end_p (i); tsi_next (&i)) | |
5358 | c_warn_unused_result (tsi_stmt_ptr (i)); | |
5359 | break; | |
5360 | ||
5361 | case COND_EXPR: | |
5362 | c_warn_unused_result (&COND_EXPR_THEN (t)); | |
5363 | c_warn_unused_result (&COND_EXPR_ELSE (t)); | |
5364 | break; | |
5365 | case BIND_EXPR: | |
5366 | c_warn_unused_result (&BIND_EXPR_BODY (t)); | |
5367 | break; | |
5368 | case TRY_FINALLY_EXPR: | |
5369 | case TRY_CATCH_EXPR: | |
5370 | c_warn_unused_result (&TREE_OPERAND (t, 0)); | |
5371 | c_warn_unused_result (&TREE_OPERAND (t, 1)); | |
5372 | break; | |
5373 | case CATCH_EXPR: | |
5374 | c_warn_unused_result (&CATCH_BODY (t)); | |
5375 | break; | |
5376 | case EH_FILTER_EXPR: | |
5377 | c_warn_unused_result (&EH_FILTER_FAILURE (t)); | |
5378 | break; | |
5379 | ||
5380 | case CALL_EXPR: | |
5381 | /* This is a naked call, as opposed to a CALL_EXPR nested inside | |
5382 | a MODIFY_EXPR. All calls whose value is ignored should be | |
5383 | represented like this. Look for the attribute. */ | |
5384 | fdecl = get_callee_fndecl (t); | |
5385 | if (fdecl) | |
5386 | ftype = TREE_TYPE (fdecl); | |
5387 | else | |
5388 | { | |
5389 | ftype = TREE_TYPE (TREE_OPERAND (t, 0)); | |
5390 | /* Look past pointer-to-function to the function type itself. */ | |
5391 | ftype = TREE_TYPE (ftype); | |
5392 | } | |
5393 | ||
5394 | if (lookup_attribute ("warn_unused_result", TYPE_ATTRIBUTES (ftype))) | |
5395 | { | |
5396 | if (fdecl) | |
5397 | warning ("%Hignoring return value of `%D', " | |
5398 | "declared with attribute warn_unused_result", | |
5399 | EXPR_LOCUS (t), fdecl); | |
5400 | else | |
5401 | warning ("%Hignoring return value of function " | |
5402 | "declared with attribute warn_unused_result", | |
5403 | EXPR_LOCUS (t)); | |
5404 | } | |
5405 | break; | |
5406 | ||
5407 | default: | |
5408 | /* Not a container, not a call, or a call whose value is used. */ | |
5409 | break; | |
5410 | } | |
5411 | } | |
5412 | ||
1f3233d1 | 5413 | #include "gt-c-common.h" |