Mercurial > hg > CbC > CbC_gcc
comparison gcc/c-family/c-common.c @ 68:561a7518be6b
update gcc-4.6
author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
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date | Sun, 21 Aug 2011 07:07:55 +0900 |
parents | |
children | b81903832de2 04ced10e8804 |
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67:f6334be47118 | 68:561a7518be6b |
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1 /* Subroutines shared by all languages that are variants of C. | |
2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, | |
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 | |
4 Free Software Foundation, Inc. | |
5 | |
6 This file is part of GCC. | |
7 | |
8 GCC is free software; you can redistribute it and/or modify it under | |
9 the terms of the GNU General Public License as published by the Free | |
10 Software Foundation; either version 3, or (at your option) any later | |
11 version. | |
12 | |
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 for more details. | |
17 | |
18 You should have received a copy of the GNU General Public License | |
19 along with GCC; see the file COPYING3. If not see | |
20 <http://www.gnu.org/licenses/>. */ | |
21 | |
22 #include "config.h" | |
23 #include "system.h" | |
24 #include "coretypes.h" | |
25 #include "tm.h" | |
26 #include "intl.h" | |
27 #include "tree.h" | |
28 #include "flags.h" | |
29 #include "output.h" | |
30 #include "c-pragma.h" | |
31 #include "ggc.h" | |
32 #include "c-common.h" | |
33 #include "c-objc.h" | |
34 #include "tm_p.h" | |
35 #include "obstack.h" | |
36 #include "cpplib.h" | |
37 #include "target.h" | |
38 #include "langhooks.h" | |
39 #include "tree-inline.h" | |
40 #include "toplev.h" | |
41 #include "diagnostic.h" | |
42 #include "tree-iterator.h" | |
43 #include "hashtab.h" | |
44 #include "tree-mudflap.h" | |
45 #include "opts.h" | |
46 #include "cgraph.h" | |
47 #include "target-def.h" | |
48 #include "libfuncs.h" | |
49 | |
50 cpp_reader *parse_in; /* Declared in c-pragma.h. */ | |
51 | |
52 /* The following symbols are subsumed in the c_global_trees array, and | |
53 listed here individually for documentation purposes. | |
54 | |
55 INTEGER_TYPE and REAL_TYPE nodes for the standard data types. | |
56 | |
57 tree short_integer_type_node; | |
58 tree long_integer_type_node; | |
59 tree long_long_integer_type_node; | |
60 tree int128_integer_type_node; | |
61 | |
62 tree short_unsigned_type_node; | |
63 tree long_unsigned_type_node; | |
64 tree long_long_unsigned_type_node; | |
65 tree int128_unsigned_type_node; | |
66 | |
67 tree truthvalue_type_node; | |
68 tree truthvalue_false_node; | |
69 tree truthvalue_true_node; | |
70 | |
71 tree ptrdiff_type_node; | |
72 | |
73 tree unsigned_char_type_node; | |
74 tree signed_char_type_node; | |
75 tree wchar_type_node; | |
76 | |
77 tree char16_type_node; | |
78 tree char32_type_node; | |
79 | |
80 tree float_type_node; | |
81 tree double_type_node; | |
82 tree long_double_type_node; | |
83 | |
84 tree complex_integer_type_node; | |
85 tree complex_float_type_node; | |
86 tree complex_double_type_node; | |
87 tree complex_long_double_type_node; | |
88 | |
89 tree dfloat32_type_node; | |
90 tree dfloat64_type_node; | |
91 tree_dfloat128_type_node; | |
92 | |
93 tree intQI_type_node; | |
94 tree intHI_type_node; | |
95 tree intSI_type_node; | |
96 tree intDI_type_node; | |
97 tree intTI_type_node; | |
98 | |
99 tree unsigned_intQI_type_node; | |
100 tree unsigned_intHI_type_node; | |
101 tree unsigned_intSI_type_node; | |
102 tree unsigned_intDI_type_node; | |
103 tree unsigned_intTI_type_node; | |
104 | |
105 tree widest_integer_literal_type_node; | |
106 tree widest_unsigned_literal_type_node; | |
107 | |
108 Nodes for types `void *' and `const void *'. | |
109 | |
110 tree ptr_type_node, const_ptr_type_node; | |
111 | |
112 Nodes for types `char *' and `const char *'. | |
113 | |
114 tree string_type_node, const_string_type_node; | |
115 | |
116 Type `char[SOMENUMBER]'. | |
117 Used when an array of char is needed and the size is irrelevant. | |
118 | |
119 tree char_array_type_node; | |
120 | |
121 Type `int[SOMENUMBER]' or something like it. | |
122 Used when an array of int needed and the size is irrelevant. | |
123 | |
124 tree int_array_type_node; | |
125 | |
126 Type `wchar_t[SOMENUMBER]' or something like it. | |
127 Used when a wide string literal is created. | |
128 | |
129 tree wchar_array_type_node; | |
130 | |
131 Type `char16_t[SOMENUMBER]' or something like it. | |
132 Used when a UTF-16 string literal is created. | |
133 | |
134 tree char16_array_type_node; | |
135 | |
136 Type `char32_t[SOMENUMBER]' or something like it. | |
137 Used when a UTF-32 string literal is created. | |
138 | |
139 tree char32_array_type_node; | |
140 | |
141 Type `int ()' -- used for implicit declaration of functions. | |
142 | |
143 tree default_function_type; | |
144 | |
145 A VOID_TYPE node, packaged in a TREE_LIST. | |
146 | |
147 tree void_list_node; | |
148 | |
149 The lazily created VAR_DECLs for __FUNCTION__, __PRETTY_FUNCTION__, | |
150 and __func__. (C doesn't generate __FUNCTION__ and__PRETTY_FUNCTION__ | |
151 VAR_DECLS, but C++ does.) | |
152 | |
153 tree function_name_decl_node; | |
154 tree pretty_function_name_decl_node; | |
155 tree c99_function_name_decl_node; | |
156 | |
157 Stack of nested function name VAR_DECLs. | |
158 | |
159 tree saved_function_name_decls; | |
160 | |
161 */ | |
162 | |
163 tree c_global_trees[CTI_MAX]; | |
164 | |
165 /* Switches common to the C front ends. */ | |
166 | |
167 /* Nonzero means don't output line number information. */ | |
168 | |
169 char flag_no_line_commands; | |
170 | |
171 /* Nonzero causes -E output not to be done, but directives such as | |
172 #define that have side effects are still obeyed. */ | |
173 | |
174 char flag_no_output; | |
175 | |
176 /* Nonzero means dump macros in some fashion. */ | |
177 | |
178 char flag_dump_macros; | |
179 | |
180 /* Nonzero means pass #include lines through to the output. */ | |
181 | |
182 char flag_dump_includes; | |
183 | |
184 /* Nonzero means process PCH files while preprocessing. */ | |
185 | |
186 bool flag_pch_preprocess; | |
187 | |
188 /* The file name to which we should write a precompiled header, or | |
189 NULL if no header will be written in this compile. */ | |
190 | |
191 const char *pch_file; | |
192 | |
193 /* Nonzero if an ISO standard was selected. It rejects macros in the | |
194 user's namespace. */ | |
195 int flag_iso; | |
196 | |
197 /* Warn about #pragma directives that are not recognized. */ | |
198 | |
199 int warn_unknown_pragmas; /* Tri state variable. */ | |
200 | |
201 /* Warn about format/argument anomalies in calls to formatted I/O functions | |
202 (*printf, *scanf, strftime, strfmon, etc.). */ | |
203 | |
204 int warn_format; | |
205 | |
206 /* C/ObjC language option variables. */ | |
207 | |
208 | |
209 /* Nonzero means allow type mismatches in conditional expressions; | |
210 just make their values `void'. */ | |
211 | |
212 int flag_cond_mismatch; | |
213 | |
214 /* Nonzero means enable C89 Amendment 1 features. */ | |
215 | |
216 int flag_isoc94; | |
217 | |
218 /* Nonzero means use the ISO C99 (or C1X) dialect of C. */ | |
219 | |
220 int flag_isoc99; | |
221 | |
222 /* Nonzero means use the ISO C1X dialect of C. */ | |
223 | |
224 int flag_isoc1x; | |
225 | |
226 /* Nonzero means that we have builtin functions, and main is an int. */ | |
227 | |
228 int flag_hosted = 1; | |
229 | |
230 | |
231 /* ObjC language option variables. */ | |
232 | |
233 | |
234 /* Tells the compiler that this is a special run. Do not perform any | |
235 compiling, instead we are to test some platform dependent features | |
236 and output a C header file with appropriate definitions. */ | |
237 | |
238 int print_struct_values; | |
239 | |
240 /* Tells the compiler what is the constant string class for ObjC. */ | |
241 | |
242 const char *constant_string_class_name; | |
243 | |
244 | |
245 /* C++ language option variables. */ | |
246 | |
247 | |
248 /* Nonzero means generate separate instantiation control files and | |
249 juggle them at link time. */ | |
250 | |
251 int flag_use_repository; | |
252 | |
253 /* The C++ dialect being used. C++98 is the default. */ | |
254 | |
255 enum cxx_dialect cxx_dialect = cxx98; | |
256 | |
257 /* Maximum template instantiation depth. This limit exists to limit the | |
258 time it takes to notice infinite template instantiations; the default | |
259 value of 1024 is likely to be in the next C++ standard. */ | |
260 | |
261 int max_tinst_depth = 1024; | |
262 | |
263 | |
264 | |
265 /* The elements of `ridpointers' are identifier nodes for the reserved | |
266 type names and storage classes. It is indexed by a RID_... value. */ | |
267 tree *ridpointers; | |
268 | |
269 tree (*make_fname_decl) (location_t, tree, int); | |
270 | |
271 /* Nonzero means don't warn about problems that occur when the code is | |
272 executed. */ | |
273 int c_inhibit_evaluation_warnings; | |
274 | |
275 /* Whether we are building a boolean conversion inside | |
276 convert_for_assignment, or some other late binary operation. If | |
277 build_binary_op is called for C (from code shared by C and C++) in | |
278 this case, then the operands have already been folded and the | |
279 result will not be folded again, so C_MAYBE_CONST_EXPR should not | |
280 be generated. */ | |
281 bool in_late_binary_op; | |
282 | |
283 /* Whether lexing has been completed, so subsequent preprocessor | |
284 errors should use the compiler's input_location. */ | |
285 bool done_lexing = false; | |
286 | |
287 /* Information about how a function name is generated. */ | |
288 struct fname_var_t | |
289 { | |
290 tree *const decl; /* pointer to the VAR_DECL. */ | |
291 const unsigned rid; /* RID number for the identifier. */ | |
292 const int pretty; /* How pretty is it? */ | |
293 }; | |
294 | |
295 /* The three ways of getting then name of the current function. */ | |
296 | |
297 const struct fname_var_t fname_vars[] = | |
298 { | |
299 /* C99 compliant __func__, must be first. */ | |
300 {&c99_function_name_decl_node, RID_C99_FUNCTION_NAME, 0}, | |
301 /* GCC __FUNCTION__ compliant. */ | |
302 {&function_name_decl_node, RID_FUNCTION_NAME, 0}, | |
303 /* GCC __PRETTY_FUNCTION__ compliant. */ | |
304 {&pretty_function_name_decl_node, RID_PRETTY_FUNCTION_NAME, 1}, | |
305 {NULL, 0, 0}, | |
306 }; | |
307 | |
308 /* Global visibility options. */ | |
309 struct visibility_flags visibility_options; | |
310 | |
311 static tree c_fully_fold_internal (tree expr, bool, bool *, bool *); | |
312 static tree check_case_value (tree); | |
313 static bool check_case_bounds (tree, tree, tree *, tree *); | |
314 | |
315 static tree handle_packed_attribute (tree *, tree, tree, int, bool *); | |
316 static tree handle_nocommon_attribute (tree *, tree, tree, int, bool *); | |
317 static tree handle_common_attribute (tree *, tree, tree, int, bool *); | |
318 static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *); | |
319 static tree handle_hot_attribute (tree *, tree, tree, int, bool *); | |
320 static tree handle_cold_attribute (tree *, tree, tree, int, bool *); | |
321 static tree handle_noinline_attribute (tree *, tree, tree, int, bool *); | |
322 static tree handle_noclone_attribute (tree *, tree, tree, int, bool *); | |
323 static tree handle_leaf_attribute (tree *, tree, tree, int, bool *); | |
324 static tree handle_always_inline_attribute (tree *, tree, tree, int, | |
325 bool *); | |
326 static tree handle_gnu_inline_attribute (tree *, tree, tree, int, bool *); | |
327 static tree handle_artificial_attribute (tree *, tree, tree, int, bool *); | |
328 static tree handle_flatten_attribute (tree *, tree, tree, int, bool *); | |
329 static tree handle_error_attribute (tree *, tree, tree, int, bool *); | |
330 static tree handle_used_attribute (tree *, tree, tree, int, bool *); | |
331 static tree handle_unused_attribute (tree *, tree, tree, int, bool *); | |
332 static tree handle_externally_visible_attribute (tree *, tree, tree, int, | |
333 bool *); | |
334 static tree handle_const_attribute (tree *, tree, tree, int, bool *); | |
335 static tree handle_transparent_union_attribute (tree *, tree, tree, | |
336 int, bool *); | |
337 static tree handle_constructor_attribute (tree *, tree, tree, int, bool *); | |
338 static tree handle_destructor_attribute (tree *, tree, tree, int, bool *); | |
339 static tree handle_mode_attribute (tree *, tree, tree, int, bool *); | |
340 static tree handle_section_attribute (tree *, tree, tree, int, bool *); | |
341 static tree handle_aligned_attribute (tree *, tree, tree, int, bool *); | |
342 static tree handle_weak_attribute (tree *, tree, tree, int, bool *) ; | |
343 static tree handle_alias_ifunc_attribute (bool, tree *, tree, tree, bool *); | |
344 static tree handle_ifunc_attribute (tree *, tree, tree, int, bool *); | |
345 static tree handle_alias_attribute (tree *, tree, tree, int, bool *); | |
346 static tree handle_weakref_attribute (tree *, tree, tree, int, bool *) ; | |
347 static tree handle_visibility_attribute (tree *, tree, tree, int, | |
348 bool *); | |
349 static tree handle_tls_model_attribute (tree *, tree, tree, int, | |
350 bool *); | |
351 static tree handle_no_instrument_function_attribute (tree *, tree, | |
352 tree, int, bool *); | |
353 static tree handle_malloc_attribute (tree *, tree, tree, int, bool *); | |
354 static tree handle_returns_twice_attribute (tree *, tree, tree, int, bool *); | |
355 static tree handle_no_limit_stack_attribute (tree *, tree, tree, int, | |
356 bool *); | |
357 static tree handle_pure_attribute (tree *, tree, tree, int, bool *); | |
358 static tree handle_novops_attribute (tree *, tree, tree, int, bool *); | |
359 static tree handle_deprecated_attribute (tree *, tree, tree, int, | |
360 bool *); | |
361 static tree handle_vector_size_attribute (tree *, tree, tree, int, | |
362 bool *); | |
363 static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *); | |
364 static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *); | |
365 static tree handle_cleanup_attribute (tree *, tree, tree, int, bool *); | |
366 static tree handle_warn_unused_result_attribute (tree *, tree, tree, int, | |
367 bool *); | |
368 static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *); | |
369 static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *); | |
370 static tree handle_alloc_size_attribute (tree *, tree, tree, int, bool *); | |
371 static tree handle_target_attribute (tree *, tree, tree, int, bool *); | |
372 static tree handle_optimize_attribute (tree *, tree, tree, int, bool *); | |
373 static tree handle_no_split_stack_attribute (tree *, tree, tree, int, bool *); | |
374 static tree handle_fnspec_attribute (tree *, tree, tree, int, bool *); | |
375 | |
376 static void check_function_nonnull (tree, int, tree *); | |
377 static void check_nonnull_arg (void *, tree, unsigned HOST_WIDE_INT); | |
378 static bool nonnull_check_p (tree, unsigned HOST_WIDE_INT); | |
379 static bool get_nonnull_operand (tree, unsigned HOST_WIDE_INT *); | |
380 static int resort_field_decl_cmp (const void *, const void *); | |
381 | |
382 /* Reserved words. The third field is a mask: keywords are disabled | |
383 if they match the mask. | |
384 | |
385 Masks for languages: | |
386 C --std=c89: D_C99 | D_CXXONLY | D_OBJC | D_CXX_OBJC | |
387 C --std=c99: D_CXXONLY | D_OBJC | |
388 ObjC is like C except that D_OBJC and D_CXX_OBJC are not set | |
389 C++ --std=c98: D_CONLY | D_CXXOX | D_OBJC | |
390 C++ --std=c0x: D_CONLY | D_OBJC | |
391 ObjC++ is like C++ except that D_OBJC is not set | |
392 | |
393 If -fno-asm is used, D_ASM is added to the mask. If | |
394 -fno-gnu-keywords is used, D_EXT is added. If -fno-asm and C in | |
395 C89 mode, D_EXT89 is added for both -fno-asm and -fno-gnu-keywords. | |
396 In C with -Wc++-compat, we warn if D_CXXWARN is set. | |
397 | |
398 Note the complication of the D_CXX_OBJC keywords. These are | |
399 reserved words such as 'class'. In C++, 'class' is a reserved | |
400 word. In Objective-C++ it is too. In Objective-C, it is a | |
401 reserved word too, but only if it follows an '@' sign. | |
402 */ | |
403 const struct c_common_resword c_common_reswords[] = | |
404 { | |
405 { "_Bool", RID_BOOL, D_CONLY }, | |
406 { "_Complex", RID_COMPLEX, 0 }, | |
407 { "_Imaginary", RID_IMAGINARY, D_CONLY }, | |
408 { "_Decimal32", RID_DFLOAT32, D_CONLY | D_EXT }, | |
409 { "_Decimal64", RID_DFLOAT64, D_CONLY | D_EXT }, | |
410 { "_Decimal128", RID_DFLOAT128, D_CONLY | D_EXT }, | |
411 { "_Fract", RID_FRACT, D_CONLY | D_EXT }, | |
412 { "_Accum", RID_ACCUM, D_CONLY | D_EXT }, | |
413 { "_Sat", RID_SAT, D_CONLY | D_EXT }, | |
414 { "_Static_assert", RID_STATIC_ASSERT, D_CONLY }, | |
415 { "__FUNCTION__", RID_FUNCTION_NAME, 0 }, | |
416 { "__PRETTY_FUNCTION__", RID_PRETTY_FUNCTION_NAME, 0 }, | |
417 { "__alignof", RID_ALIGNOF, 0 }, | |
418 { "__alignof__", RID_ALIGNOF, 0 }, | |
419 { "__asm", RID_ASM, 0 }, | |
420 { "__asm__", RID_ASM, 0 }, | |
421 { "__attribute", RID_ATTRIBUTE, 0 }, | |
422 { "__attribute__", RID_ATTRIBUTE, 0 }, | |
423 { "__builtin_choose_expr", RID_CHOOSE_EXPR, D_CONLY }, | |
424 { "__builtin_offsetof", RID_OFFSETOF, 0 }, | |
425 { "__builtin_types_compatible_p", RID_TYPES_COMPATIBLE_P, D_CONLY }, | |
426 { "__builtin_va_arg", RID_VA_ARG, 0 }, | |
427 { "__complex", RID_COMPLEX, 0 }, | |
428 { "__complex__", RID_COMPLEX, 0 }, | |
429 { "__const", RID_CONST, 0 }, | |
430 { "__const__", RID_CONST, 0 }, | |
431 { "__decltype", RID_DECLTYPE, D_CXXONLY }, | |
432 { "__extension__", RID_EXTENSION, 0 }, | |
433 { "__func__", RID_C99_FUNCTION_NAME, 0 }, | |
434 { "__has_nothrow_assign", RID_HAS_NOTHROW_ASSIGN, D_CXXONLY }, | |
435 { "__has_nothrow_constructor", RID_HAS_NOTHROW_CONSTRUCTOR, D_CXXONLY }, | |
436 { "__has_nothrow_copy", RID_HAS_NOTHROW_COPY, D_CXXONLY }, | |
437 { "__has_trivial_assign", RID_HAS_TRIVIAL_ASSIGN, D_CXXONLY }, | |
438 { "__has_trivial_constructor", RID_HAS_TRIVIAL_CONSTRUCTOR, D_CXXONLY }, | |
439 { "__has_trivial_copy", RID_HAS_TRIVIAL_COPY, D_CXXONLY }, | |
440 { "__has_trivial_destructor", RID_HAS_TRIVIAL_DESTRUCTOR, D_CXXONLY }, | |
441 { "__has_virtual_destructor", RID_HAS_VIRTUAL_DESTRUCTOR, D_CXXONLY }, | |
442 { "__int128", RID_INT128, 0 }, | |
443 { "__is_abstract", RID_IS_ABSTRACT, D_CXXONLY }, | |
444 { "__is_base_of", RID_IS_BASE_OF, D_CXXONLY }, | |
445 { "__is_class", RID_IS_CLASS, D_CXXONLY }, | |
446 { "__is_convertible_to", RID_IS_CONVERTIBLE_TO, D_CXXONLY }, | |
447 { "__is_empty", RID_IS_EMPTY, D_CXXONLY }, | |
448 { "__is_enum", RID_IS_ENUM, D_CXXONLY }, | |
449 { "__is_pod", RID_IS_POD, D_CXXONLY }, | |
450 { "__is_polymorphic", RID_IS_POLYMORPHIC, D_CXXONLY }, | |
451 { "__is_standard_layout", RID_IS_STD_LAYOUT, D_CXXONLY }, | |
452 { "__is_trivial", RID_IS_TRIVIAL, D_CXXONLY }, | |
453 { "__is_union", RID_IS_UNION, D_CXXONLY }, | |
454 { "__is_literal_type", RID_IS_LITERAL_TYPE, D_CXXONLY }, | |
455 { "__imag", RID_IMAGPART, 0 }, | |
456 { "__imag__", RID_IMAGPART, 0 }, | |
457 { "__inline", RID_INLINE, 0 }, | |
458 { "__inline__", RID_INLINE, 0 }, | |
459 { "__label__", RID_LABEL, 0 }, | |
460 { "__null", RID_NULL, 0 }, | |
461 { "__real", RID_REALPART, 0 }, | |
462 { "__real__", RID_REALPART, 0 }, | |
463 { "__restrict", RID_RESTRICT, 0 }, | |
464 { "__restrict__", RID_RESTRICT, 0 }, | |
465 { "__signed", RID_SIGNED, 0 }, | |
466 { "__signed__", RID_SIGNED, 0 }, | |
467 { "__thread", RID_THREAD, 0 }, | |
468 { "__typeof", RID_TYPEOF, 0 }, | |
469 { "__typeof__", RID_TYPEOF, 0 }, | |
470 { "__volatile", RID_VOLATILE, 0 }, | |
471 { "__volatile__", RID_VOLATILE, 0 }, | |
472 { "alignof", RID_ALIGNOF, D_CXXONLY | D_CXX0X | D_CXXWARN }, | |
473 { "asm", RID_ASM, D_ASM }, | |
474 { "auto", RID_AUTO, 0 }, | |
475 { "bool", RID_BOOL, D_CXXONLY | D_CXXWARN }, | |
476 { "break", RID_BREAK, 0 }, | |
477 { "case", RID_CASE, 0 }, | |
478 { "catch", RID_CATCH, D_CXX_OBJC | D_CXXWARN }, | |
479 { "char", RID_CHAR, 0 }, | |
480 { "char16_t", RID_CHAR16, D_CXXONLY | D_CXX0X | D_CXXWARN }, | |
481 { "char32_t", RID_CHAR32, D_CXXONLY | D_CXX0X | D_CXXWARN }, | |
482 { "class", RID_CLASS, D_CXX_OBJC | D_CXXWARN }, | |
483 { "const", RID_CONST, 0 }, | |
484 { "constexpr", RID_CONSTEXPR, D_CXXONLY | D_CXX0X | D_CXXWARN }, | |
485 { "const_cast", RID_CONSTCAST, D_CXXONLY | D_CXXWARN }, | |
486 { "continue", RID_CONTINUE, 0 }, | |
487 { "decltype", RID_DECLTYPE, D_CXXONLY | D_CXX0X | D_CXXWARN }, | |
488 { "default", RID_DEFAULT, 0 }, | |
489 { "delete", RID_DELETE, D_CXXONLY | D_CXXWARN }, | |
490 { "do", RID_DO, 0 }, | |
491 { "double", RID_DOUBLE, 0 }, | |
492 { "dynamic_cast", RID_DYNCAST, D_CXXONLY | D_CXXWARN }, | |
493 { "else", RID_ELSE, 0 }, | |
494 { "enum", RID_ENUM, 0 }, | |
495 { "explicit", RID_EXPLICIT, D_CXXONLY | D_CXXWARN }, | |
496 { "export", RID_EXPORT, D_CXXONLY | D_CXXWARN }, | |
497 { "extern", RID_EXTERN, 0 }, | |
498 { "false", RID_FALSE, D_CXXONLY | D_CXXWARN }, | |
499 { "float", RID_FLOAT, 0 }, | |
500 { "for", RID_FOR, 0 }, | |
501 { "friend", RID_FRIEND, D_CXXONLY | D_CXXWARN }, | |
502 { "goto", RID_GOTO, 0 }, | |
503 { "if", RID_IF, 0 }, | |
504 { "inline", RID_INLINE, D_EXT89 }, | |
505 { "int", RID_INT, 0 }, | |
506 { "long", RID_LONG, 0 }, | |
507 { "mutable", RID_MUTABLE, D_CXXONLY | D_CXXWARN }, | |
508 { "namespace", RID_NAMESPACE, D_CXXONLY | D_CXXWARN }, | |
509 { "new", RID_NEW, D_CXXONLY | D_CXXWARN }, | |
510 { "noexcept", RID_NOEXCEPT, D_CXXONLY | D_CXX0X | D_CXXWARN }, | |
511 { "nullptr", RID_NULLPTR, D_CXXONLY | D_CXX0X | D_CXXWARN }, | |
512 { "operator", RID_OPERATOR, D_CXXONLY | D_CXXWARN }, | |
513 { "private", RID_PRIVATE, D_CXX_OBJC | D_CXXWARN }, | |
514 { "protected", RID_PROTECTED, D_CXX_OBJC | D_CXXWARN }, | |
515 { "public", RID_PUBLIC, D_CXX_OBJC | D_CXXWARN }, | |
516 { "register", RID_REGISTER, 0 }, | |
517 { "reinterpret_cast", RID_REINTCAST, D_CXXONLY | D_CXXWARN }, | |
518 { "restrict", RID_RESTRICT, D_CONLY | D_C99 }, | |
519 { "return", RID_RETURN, 0 }, | |
520 { "short", RID_SHORT, 0 }, | |
521 { "signed", RID_SIGNED, 0 }, | |
522 { "sizeof", RID_SIZEOF, 0 }, | |
523 { "static", RID_STATIC, 0 }, | |
524 { "static_assert", RID_STATIC_ASSERT, D_CXXONLY | D_CXX0X | D_CXXWARN }, | |
525 { "static_cast", RID_STATCAST, D_CXXONLY | D_CXXWARN }, | |
526 { "struct", RID_STRUCT, 0 }, | |
527 { "switch", RID_SWITCH, 0 }, | |
528 { "template", RID_TEMPLATE, D_CXXONLY | D_CXXWARN }, | |
529 { "this", RID_THIS, D_CXXONLY | D_CXXWARN }, | |
530 { "throw", RID_THROW, D_CXX_OBJC | D_CXXWARN }, | |
531 { "true", RID_TRUE, D_CXXONLY | D_CXXWARN }, | |
532 { "try", RID_TRY, D_CXX_OBJC | D_CXXWARN }, | |
533 { "typedef", RID_TYPEDEF, 0 }, | |
534 { "typename", RID_TYPENAME, D_CXXONLY | D_CXXWARN }, | |
535 { "typeid", RID_TYPEID, D_CXXONLY | D_CXXWARN }, | |
536 { "typeof", RID_TYPEOF, D_ASM | D_EXT }, | |
537 { "union", RID_UNION, 0 }, | |
538 { "unsigned", RID_UNSIGNED, 0 }, | |
539 { "using", RID_USING, D_CXXONLY | D_CXXWARN }, | |
540 { "virtual", RID_VIRTUAL, D_CXXONLY | D_CXXWARN }, | |
541 { "void", RID_VOID, 0 }, | |
542 { "volatile", RID_VOLATILE, 0 }, | |
543 { "wchar_t", RID_WCHAR, D_CXXONLY }, | |
544 { "while", RID_WHILE, 0 }, | |
545 /* These Objective-C keywords are recognized only immediately after | |
546 an '@'. */ | |
547 { "compatibility_alias", RID_AT_ALIAS, D_OBJC }, | |
548 { "defs", RID_AT_DEFS, D_OBJC }, | |
549 { "encode", RID_AT_ENCODE, D_OBJC }, | |
550 { "end", RID_AT_END, D_OBJC }, | |
551 { "implementation", RID_AT_IMPLEMENTATION, D_OBJC }, | |
552 { "interface", RID_AT_INTERFACE, D_OBJC }, | |
553 { "protocol", RID_AT_PROTOCOL, D_OBJC }, | |
554 { "selector", RID_AT_SELECTOR, D_OBJC }, | |
555 { "finally", RID_AT_FINALLY, D_OBJC }, | |
556 { "synchronized", RID_AT_SYNCHRONIZED, D_OBJC }, | |
557 { "optional", RID_AT_OPTIONAL, D_OBJC }, | |
558 { "required", RID_AT_REQUIRED, D_OBJC }, | |
559 { "property", RID_AT_PROPERTY, D_OBJC }, | |
560 { "package", RID_AT_PACKAGE, D_OBJC }, | |
561 { "synthesize", RID_AT_SYNTHESIZE, D_OBJC }, | |
562 { "dynamic", RID_AT_DYNAMIC, D_OBJC }, | |
563 /* These are recognized only in protocol-qualifier context | |
564 (see above) */ | |
565 { "bycopy", RID_BYCOPY, D_OBJC }, | |
566 { "byref", RID_BYREF, D_OBJC }, | |
567 { "in", RID_IN, D_OBJC }, | |
568 { "inout", RID_INOUT, D_OBJC }, | |
569 { "oneway", RID_ONEWAY, D_OBJC }, | |
570 { "out", RID_OUT, D_OBJC }, | |
571 /* These are recognized inside a property attribute list */ | |
572 { "assign", RID_ASSIGN, D_OBJC }, | |
573 { "copy", RID_COPY, D_OBJC }, | |
574 { "getter", RID_GETTER, D_OBJC }, | |
575 { "nonatomic", RID_NONATOMIC, D_OBJC }, | |
576 { "readonly", RID_READONLY, D_OBJC }, | |
577 { "readwrite", RID_READWRITE, D_OBJC }, | |
578 { "retain", RID_RETAIN, D_OBJC }, | |
579 { "setter", RID_SETTER, D_OBJC }, | |
580 }; | |
581 | |
582 const unsigned int num_c_common_reswords = | |
583 sizeof c_common_reswords / sizeof (struct c_common_resword); | |
584 | |
585 /* Table of machine-independent attributes common to all C-like languages. */ | |
586 const struct attribute_spec c_common_attribute_table[] = | |
587 { | |
588 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ | |
589 { "packed", 0, 0, false, false, false, | |
590 handle_packed_attribute }, | |
591 { "nocommon", 0, 0, true, false, false, | |
592 handle_nocommon_attribute }, | |
593 { "common", 0, 0, true, false, false, | |
594 handle_common_attribute }, | |
595 /* FIXME: logically, noreturn attributes should be listed as | |
596 "false, true, true" and apply to function types. But implementing this | |
597 would require all the places in the compiler that use TREE_THIS_VOLATILE | |
598 on a decl to identify non-returning functions to be located and fixed | |
599 to check the function type instead. */ | |
600 { "noreturn", 0, 0, true, false, false, | |
601 handle_noreturn_attribute }, | |
602 { "volatile", 0, 0, true, false, false, | |
603 handle_noreturn_attribute }, | |
604 { "noinline", 0, 0, true, false, false, | |
605 handle_noinline_attribute }, | |
606 { "noclone", 0, 0, true, false, false, | |
607 handle_noclone_attribute }, | |
608 { "leaf", 0, 0, true, false, false, | |
609 handle_leaf_attribute }, | |
610 { "always_inline", 0, 0, true, false, false, | |
611 handle_always_inline_attribute }, | |
612 { "gnu_inline", 0, 0, true, false, false, | |
613 handle_gnu_inline_attribute }, | |
614 { "artificial", 0, 0, true, false, false, | |
615 handle_artificial_attribute }, | |
616 { "flatten", 0, 0, true, false, false, | |
617 handle_flatten_attribute }, | |
618 { "used", 0, 0, true, false, false, | |
619 handle_used_attribute }, | |
620 { "unused", 0, 0, false, false, false, | |
621 handle_unused_attribute }, | |
622 { "externally_visible", 0, 0, true, false, false, | |
623 handle_externally_visible_attribute }, | |
624 /* The same comments as for noreturn attributes apply to const ones. */ | |
625 { "const", 0, 0, true, false, false, | |
626 handle_const_attribute }, | |
627 { "transparent_union", 0, 0, false, false, false, | |
628 handle_transparent_union_attribute }, | |
629 { "constructor", 0, 1, true, false, false, | |
630 handle_constructor_attribute }, | |
631 { "destructor", 0, 1, true, false, false, | |
632 handle_destructor_attribute }, | |
633 { "mode", 1, 1, false, true, false, | |
634 handle_mode_attribute }, | |
635 { "section", 1, 1, true, false, false, | |
636 handle_section_attribute }, | |
637 { "aligned", 0, 1, false, false, false, | |
638 handle_aligned_attribute }, | |
639 { "weak", 0, 0, true, false, false, | |
640 handle_weak_attribute }, | |
641 { "ifunc", 1, 1, true, false, false, | |
642 handle_ifunc_attribute }, | |
643 { "alias", 1, 1, true, false, false, | |
644 handle_alias_attribute }, | |
645 { "weakref", 0, 1, true, false, false, | |
646 handle_weakref_attribute }, | |
647 { "no_instrument_function", 0, 0, true, false, false, | |
648 handle_no_instrument_function_attribute }, | |
649 { "malloc", 0, 0, true, false, false, | |
650 handle_malloc_attribute }, | |
651 { "returns_twice", 0, 0, true, false, false, | |
652 handle_returns_twice_attribute }, | |
653 { "no_stack_limit", 0, 0, true, false, false, | |
654 handle_no_limit_stack_attribute }, | |
655 { "pure", 0, 0, true, false, false, | |
656 handle_pure_attribute }, | |
657 /* For internal use (marking of builtins) only. The name contains space | |
658 to prevent its usage in source code. */ | |
659 { "no vops", 0, 0, true, false, false, | |
660 handle_novops_attribute }, | |
661 { "deprecated", 0, 1, false, false, false, | |
662 handle_deprecated_attribute }, | |
663 { "vector_size", 1, 1, false, true, false, | |
664 handle_vector_size_attribute }, | |
665 { "visibility", 1, 1, false, false, false, | |
666 handle_visibility_attribute }, | |
667 { "tls_model", 1, 1, true, false, false, | |
668 handle_tls_model_attribute }, | |
669 { "nonnull", 0, -1, false, true, true, | |
670 handle_nonnull_attribute }, | |
671 { "nothrow", 0, 0, true, false, false, | |
672 handle_nothrow_attribute }, | |
673 { "may_alias", 0, 0, false, true, false, NULL }, | |
674 { "cleanup", 1, 1, true, false, false, | |
675 handle_cleanup_attribute }, | |
676 { "warn_unused_result", 0, 0, false, true, true, | |
677 handle_warn_unused_result_attribute }, | |
678 { "sentinel", 0, 1, false, true, true, | |
679 handle_sentinel_attribute }, | |
680 /* For internal use (marking of builtins) only. The name contains space | |
681 to prevent its usage in source code. */ | |
682 { "type generic", 0, 0, false, true, true, | |
683 handle_type_generic_attribute }, | |
684 { "alloc_size", 1, 2, false, true, true, | |
685 handle_alloc_size_attribute }, | |
686 { "cold", 0, 0, true, false, false, | |
687 handle_cold_attribute }, | |
688 { "hot", 0, 0, true, false, false, | |
689 handle_hot_attribute }, | |
690 { "warning", 1, 1, true, false, false, | |
691 handle_error_attribute }, | |
692 { "error", 1, 1, true, false, false, | |
693 handle_error_attribute }, | |
694 { "target", 1, -1, true, false, false, | |
695 handle_target_attribute }, | |
696 { "optimize", 1, -1, true, false, false, | |
697 handle_optimize_attribute }, | |
698 { "no_split_stack", 0, 0, true, false, false, | |
699 handle_no_split_stack_attribute }, | |
700 /* For internal use (marking of builtins and runtime functions) only. | |
701 The name contains space to prevent its usage in source code. */ | |
702 { "fn spec", 1, 1, false, true, true, | |
703 handle_fnspec_attribute }, | |
704 { NULL, 0, 0, false, false, false, NULL } | |
705 }; | |
706 | |
707 /* Give the specifications for the format attributes, used by C and all | |
708 descendants. */ | |
709 | |
710 const struct attribute_spec c_common_format_attribute_table[] = | |
711 { | |
712 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ | |
713 { "format", 3, 3, false, true, true, | |
714 handle_format_attribute }, | |
715 { "format_arg", 1, 1, false, true, true, | |
716 handle_format_arg_attribute }, | |
717 { NULL, 0, 0, false, false, false, NULL } | |
718 }; | |
719 | |
720 /* Return identifier for address space AS. */ | |
721 | |
722 const char * | |
723 c_addr_space_name (addr_space_t as) | |
724 { | |
725 int rid = RID_FIRST_ADDR_SPACE + as; | |
726 gcc_assert (ridpointers [rid]); | |
727 return IDENTIFIER_POINTER (ridpointers [rid]); | |
728 } | |
729 | |
730 /* Push current bindings for the function name VAR_DECLS. */ | |
731 | |
732 void | |
733 start_fname_decls (void) | |
734 { | |
735 unsigned ix; | |
736 tree saved = NULL_TREE; | |
737 | |
738 for (ix = 0; fname_vars[ix].decl; ix++) | |
739 { | |
740 tree decl = *fname_vars[ix].decl; | |
741 | |
742 if (decl) | |
743 { | |
744 saved = tree_cons (decl, build_int_cst (NULL_TREE, ix), saved); | |
745 *fname_vars[ix].decl = NULL_TREE; | |
746 } | |
747 } | |
748 if (saved || saved_function_name_decls) | |
749 /* Normally they'll have been NULL, so only push if we've got a | |
750 stack, or they are non-NULL. */ | |
751 saved_function_name_decls = tree_cons (saved, NULL_TREE, | |
752 saved_function_name_decls); | |
753 } | |
754 | |
755 /* Finish up the current bindings, adding them into the current function's | |
756 statement tree. This must be done _before_ finish_stmt_tree is called. | |
757 If there is no current function, we must be at file scope and no statements | |
758 are involved. Pop the previous bindings. */ | |
759 | |
760 void | |
761 finish_fname_decls (void) | |
762 { | |
763 unsigned ix; | |
764 tree stmts = NULL_TREE; | |
765 tree stack = saved_function_name_decls; | |
766 | |
767 for (; stack && TREE_VALUE (stack); stack = TREE_CHAIN (stack)) | |
768 append_to_statement_list (TREE_VALUE (stack), &stmts); | |
769 | |
770 if (stmts) | |
771 { | |
772 tree *bodyp = &DECL_SAVED_TREE (current_function_decl); | |
773 | |
774 if (TREE_CODE (*bodyp) == BIND_EXPR) | |
775 bodyp = &BIND_EXPR_BODY (*bodyp); | |
776 | |
777 append_to_statement_list_force (*bodyp, &stmts); | |
778 *bodyp = stmts; | |
779 } | |
780 | |
781 for (ix = 0; fname_vars[ix].decl; ix++) | |
782 *fname_vars[ix].decl = NULL_TREE; | |
783 | |
784 if (stack) | |
785 { | |
786 /* We had saved values, restore them. */ | |
787 tree saved; | |
788 | |
789 for (saved = TREE_PURPOSE (stack); saved; saved = TREE_CHAIN (saved)) | |
790 { | |
791 tree decl = TREE_PURPOSE (saved); | |
792 unsigned ix = TREE_INT_CST_LOW (TREE_VALUE (saved)); | |
793 | |
794 *fname_vars[ix].decl = decl; | |
795 } | |
796 stack = TREE_CHAIN (stack); | |
797 } | |
798 saved_function_name_decls = stack; | |
799 } | |
800 | |
801 /* Return the text name of the current function, suitably prettified | |
802 by PRETTY_P. Return string must be freed by caller. */ | |
803 | |
804 const char * | |
805 fname_as_string (int pretty_p) | |
806 { | |
807 const char *name = "top level"; | |
808 char *namep; | |
809 int vrb = 2, len; | |
810 cpp_string cstr = { 0, 0 }, strname; | |
811 | |
812 if (!pretty_p) | |
813 { | |
814 name = ""; | |
815 vrb = 0; | |
816 } | |
817 | |
818 if (current_function_decl) | |
819 name = lang_hooks.decl_printable_name (current_function_decl, vrb); | |
820 | |
821 len = strlen (name) + 3; /* Two for '"'s. One for NULL. */ | |
822 | |
823 namep = XNEWVEC (char, len); | |
824 snprintf (namep, len, "\"%s\"", name); | |
825 strname.text = (unsigned char *) namep; | |
826 strname.len = len - 1; | |
827 | |
828 if (cpp_interpret_string (parse_in, &strname, 1, &cstr, CPP_STRING)) | |
829 { | |
830 XDELETEVEC (namep); | |
831 return (const char *) cstr.text; | |
832 } | |
833 | |
834 return namep; | |
835 } | |
836 | |
837 /* Return the VAR_DECL for a const char array naming the current | |
838 function. If the VAR_DECL has not yet been created, create it | |
839 now. RID indicates how it should be formatted and IDENTIFIER_NODE | |
840 ID is its name (unfortunately C and C++ hold the RID values of | |
841 keywords in different places, so we can't derive RID from ID in | |
842 this language independent code. LOC is the location of the | |
843 function. */ | |
844 | |
845 tree | |
846 fname_decl (location_t loc, unsigned int rid, tree id) | |
847 { | |
848 unsigned ix; | |
849 tree decl = NULL_TREE; | |
850 | |
851 for (ix = 0; fname_vars[ix].decl; ix++) | |
852 if (fname_vars[ix].rid == rid) | |
853 break; | |
854 | |
855 decl = *fname_vars[ix].decl; | |
856 if (!decl) | |
857 { | |
858 /* If a tree is built here, it would normally have the lineno of | |
859 the current statement. Later this tree will be moved to the | |
860 beginning of the function and this line number will be wrong. | |
861 To avoid this problem set the lineno to 0 here; that prevents | |
862 it from appearing in the RTL. */ | |
863 tree stmts; | |
864 location_t saved_location = input_location; | |
865 input_location = UNKNOWN_LOCATION; | |
866 | |
867 stmts = push_stmt_list (); | |
868 decl = (*make_fname_decl) (loc, id, fname_vars[ix].pretty); | |
869 stmts = pop_stmt_list (stmts); | |
870 if (!IS_EMPTY_STMT (stmts)) | |
871 saved_function_name_decls | |
872 = tree_cons (decl, stmts, saved_function_name_decls); | |
873 *fname_vars[ix].decl = decl; | |
874 input_location = saved_location; | |
875 } | |
876 if (!ix && !current_function_decl) | |
877 pedwarn (loc, 0, "%qD is not defined outside of function scope", decl); | |
878 | |
879 return decl; | |
880 } | |
881 | |
882 /* Given a STRING_CST, give it a suitable array-of-chars data type. */ | |
883 | |
884 tree | |
885 fix_string_type (tree value) | |
886 { | |
887 int length = TREE_STRING_LENGTH (value); | |
888 int nchars; | |
889 tree e_type, i_type, a_type; | |
890 | |
891 /* Compute the number of elements, for the array type. */ | |
892 if (TREE_TYPE (value) == char_array_type_node || !TREE_TYPE (value)) | |
893 { | |
894 nchars = length; | |
895 e_type = char_type_node; | |
896 } | |
897 else if (TREE_TYPE (value) == char16_array_type_node) | |
898 { | |
899 nchars = length / (TYPE_PRECISION (char16_type_node) / BITS_PER_UNIT); | |
900 e_type = char16_type_node; | |
901 } | |
902 else if (TREE_TYPE (value) == char32_array_type_node) | |
903 { | |
904 nchars = length / (TYPE_PRECISION (char32_type_node) / BITS_PER_UNIT); | |
905 e_type = char32_type_node; | |
906 } | |
907 else | |
908 { | |
909 nchars = length / (TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT); | |
910 e_type = wchar_type_node; | |
911 } | |
912 | |
913 /* C89 2.2.4.1, C99 5.2.4.1 (Translation limits). The analogous | |
914 limit in C++98 Annex B is very large (65536) and is not normative, | |
915 so we do not diagnose it (warn_overlength_strings is forced off | |
916 in c_common_post_options). */ | |
917 if (warn_overlength_strings) | |
918 { | |
919 const int nchars_max = flag_isoc99 ? 4095 : 509; | |
920 const int relevant_std = flag_isoc99 ? 99 : 90; | |
921 if (nchars - 1 > nchars_max) | |
922 /* Translators: The %d after 'ISO C' will be 90 or 99. Do not | |
923 separate the %d from the 'C'. 'ISO' should not be | |
924 translated, but it may be moved after 'C%d' in languages | |
925 where modifiers follow nouns. */ | |
926 pedwarn (input_location, OPT_Woverlength_strings, | |
927 "string length %qd is greater than the length %qd " | |
928 "ISO C%d compilers are required to support", | |
929 nchars - 1, nchars_max, relevant_std); | |
930 } | |
931 | |
932 /* Create the array type for the string constant. The ISO C++ | |
933 standard says that a string literal has type `const char[N]' or | |
934 `const wchar_t[N]'. We use the same logic when invoked as a C | |
935 front-end with -Wwrite-strings. | |
936 ??? We should change the type of an expression depending on the | |
937 state of a warning flag. We should just be warning -- see how | |
938 this is handled in the C++ front-end for the deprecated implicit | |
939 conversion from string literals to `char*' or `wchar_t*'. | |
940 | |
941 The C++ front end relies on TYPE_MAIN_VARIANT of a cv-qualified | |
942 array type being the unqualified version of that type. | |
943 Therefore, if we are constructing an array of const char, we must | |
944 construct the matching unqualified array type first. The C front | |
945 end does not require this, but it does no harm, so we do it | |
946 unconditionally. */ | |
947 i_type = build_index_type (build_int_cst (NULL_TREE, nchars - 1)); | |
948 a_type = build_array_type (e_type, i_type); | |
949 if (c_dialect_cxx() || warn_write_strings) | |
950 a_type = c_build_qualified_type (a_type, TYPE_QUAL_CONST); | |
951 | |
952 TREE_TYPE (value) = a_type; | |
953 TREE_CONSTANT (value) = 1; | |
954 TREE_READONLY (value) = 1; | |
955 TREE_STATIC (value) = 1; | |
956 return value; | |
957 } | |
958 | |
959 /* Fully fold EXPR, an expression that was not folded (beyond integer | |
960 constant expressions and null pointer constants) when being built | |
961 up. If IN_INIT, this is in a static initializer and certain | |
962 changes are made to the folding done. Clear *MAYBE_CONST if | |
963 MAYBE_CONST is not NULL and EXPR is definitely not a constant | |
964 expression because it contains an evaluated operator (in C99) or an | |
965 operator outside of sizeof returning an integer constant (in C90) | |
966 not permitted in constant expressions, or because it contains an | |
967 evaluated arithmetic overflow. (*MAYBE_CONST should typically be | |
968 set to true by callers before calling this function.) Return the | |
969 folded expression. Function arguments have already been folded | |
970 before calling this function, as have the contents of SAVE_EXPR, | |
971 TARGET_EXPR, BIND_EXPR, VA_ARG_EXPR, OBJ_TYPE_REF and | |
972 C_MAYBE_CONST_EXPR. */ | |
973 | |
974 tree | |
975 c_fully_fold (tree expr, bool in_init, bool *maybe_const) | |
976 { | |
977 tree ret; | |
978 tree eptype = NULL_TREE; | |
979 bool dummy = true; | |
980 bool maybe_const_itself = true; | |
981 location_t loc = EXPR_LOCATION (expr); | |
982 | |
983 /* This function is not relevant to C++ because C++ folds while | |
984 parsing, and may need changes to be correct for C++ when C++ | |
985 stops folding while parsing. */ | |
986 if (c_dialect_cxx ()) | |
987 gcc_unreachable (); | |
988 | |
989 if (!maybe_const) | |
990 maybe_const = &dummy; | |
991 if (TREE_CODE (expr) == EXCESS_PRECISION_EXPR) | |
992 { | |
993 eptype = TREE_TYPE (expr); | |
994 expr = TREE_OPERAND (expr, 0); | |
995 } | |
996 ret = c_fully_fold_internal (expr, in_init, maybe_const, | |
997 &maybe_const_itself); | |
998 if (eptype) | |
999 ret = fold_convert_loc (loc, eptype, ret); | |
1000 *maybe_const &= maybe_const_itself; | |
1001 return ret; | |
1002 } | |
1003 | |
1004 /* Internal helper for c_fully_fold. EXPR and IN_INIT are as for | |
1005 c_fully_fold. *MAYBE_CONST_OPERANDS is cleared because of operands | |
1006 not permitted, while *MAYBE_CONST_ITSELF is cleared because of | |
1007 arithmetic overflow (for C90, *MAYBE_CONST_OPERANDS is carried from | |
1008 both evaluated and unevaluated subexpressions while | |
1009 *MAYBE_CONST_ITSELF is carried from only evaluated | |
1010 subexpressions). */ | |
1011 | |
1012 static tree | |
1013 c_fully_fold_internal (tree expr, bool in_init, bool *maybe_const_operands, | |
1014 bool *maybe_const_itself) | |
1015 { | |
1016 tree ret = expr; | |
1017 enum tree_code code = TREE_CODE (expr); | |
1018 enum tree_code_class kind = TREE_CODE_CLASS (code); | |
1019 location_t loc = EXPR_LOCATION (expr); | |
1020 tree op0, op1, op2, op3; | |
1021 tree orig_op0, orig_op1, orig_op2; | |
1022 bool op0_const = true, op1_const = true, op2_const = true; | |
1023 bool op0_const_self = true, op1_const_self = true, op2_const_self = true; | |
1024 bool nowarning = TREE_NO_WARNING (expr); | |
1025 int unused_p; | |
1026 | |
1027 /* This function is not relevant to C++ because C++ folds while | |
1028 parsing, and may need changes to be correct for C++ when C++ | |
1029 stops folding while parsing. */ | |
1030 if (c_dialect_cxx ()) | |
1031 gcc_unreachable (); | |
1032 | |
1033 /* Constants, declarations, statements, errors, SAVE_EXPRs and | |
1034 anything else not counted as an expression cannot usefully be | |
1035 folded further at this point. */ | |
1036 if (!IS_EXPR_CODE_CLASS (kind) | |
1037 || kind == tcc_statement | |
1038 || code == SAVE_EXPR) | |
1039 return expr; | |
1040 | |
1041 /* Operands of variable-length expressions (function calls) have | |
1042 already been folded, as have __builtin_* function calls, and such | |
1043 expressions cannot occur in constant expressions. */ | |
1044 if (kind == tcc_vl_exp) | |
1045 { | |
1046 *maybe_const_operands = false; | |
1047 ret = fold (expr); | |
1048 goto out; | |
1049 } | |
1050 | |
1051 if (code == C_MAYBE_CONST_EXPR) | |
1052 { | |
1053 tree pre = C_MAYBE_CONST_EXPR_PRE (expr); | |
1054 tree inner = C_MAYBE_CONST_EXPR_EXPR (expr); | |
1055 if (C_MAYBE_CONST_EXPR_NON_CONST (expr)) | |
1056 *maybe_const_operands = false; | |
1057 if (C_MAYBE_CONST_EXPR_INT_OPERANDS (expr)) | |
1058 *maybe_const_itself = false; | |
1059 if (pre && !in_init) | |
1060 ret = build2 (COMPOUND_EXPR, TREE_TYPE (expr), pre, inner); | |
1061 else | |
1062 ret = inner; | |
1063 goto out; | |
1064 } | |
1065 | |
1066 /* Assignment, increment, decrement, function call and comma | |
1067 operators, and statement expressions, cannot occur in constant | |
1068 expressions if evaluated / outside of sizeof. (Function calls | |
1069 were handled above, though VA_ARG_EXPR is treated like a function | |
1070 call here, and statement expressions are handled through | |
1071 C_MAYBE_CONST_EXPR to avoid folding inside them.) */ | |
1072 switch (code) | |
1073 { | |
1074 case MODIFY_EXPR: | |
1075 case PREDECREMENT_EXPR: | |
1076 case PREINCREMENT_EXPR: | |
1077 case POSTDECREMENT_EXPR: | |
1078 case POSTINCREMENT_EXPR: | |
1079 case COMPOUND_EXPR: | |
1080 *maybe_const_operands = false; | |
1081 break; | |
1082 | |
1083 case VA_ARG_EXPR: | |
1084 case TARGET_EXPR: | |
1085 case BIND_EXPR: | |
1086 case OBJ_TYPE_REF: | |
1087 *maybe_const_operands = false; | |
1088 ret = fold (expr); | |
1089 goto out; | |
1090 | |
1091 default: | |
1092 break; | |
1093 } | |
1094 | |
1095 /* Fold individual tree codes as appropriate. */ | |
1096 switch (code) | |
1097 { | |
1098 case COMPOUND_LITERAL_EXPR: | |
1099 /* Any non-constancy will have been marked in a containing | |
1100 C_MAYBE_CONST_EXPR; there is no more folding to do here. */ | |
1101 goto out; | |
1102 | |
1103 case COMPONENT_REF: | |
1104 orig_op0 = op0 = TREE_OPERAND (expr, 0); | |
1105 op1 = TREE_OPERAND (expr, 1); | |
1106 op2 = TREE_OPERAND (expr, 2); | |
1107 op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands, | |
1108 maybe_const_itself); | |
1109 STRIP_TYPE_NOPS (op0); | |
1110 if (op0 != orig_op0) | |
1111 ret = build3 (COMPONENT_REF, TREE_TYPE (expr), op0, op1, op2); | |
1112 if (ret != expr) | |
1113 { | |
1114 TREE_READONLY (ret) = TREE_READONLY (expr); | |
1115 TREE_THIS_VOLATILE (ret) = TREE_THIS_VOLATILE (expr); | |
1116 } | |
1117 goto out; | |
1118 | |
1119 case ARRAY_REF: | |
1120 orig_op0 = op0 = TREE_OPERAND (expr, 0); | |
1121 orig_op1 = op1 = TREE_OPERAND (expr, 1); | |
1122 op2 = TREE_OPERAND (expr, 2); | |
1123 op3 = TREE_OPERAND (expr, 3); | |
1124 op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands, | |
1125 maybe_const_itself); | |
1126 STRIP_TYPE_NOPS (op0); | |
1127 op1 = c_fully_fold_internal (op1, in_init, maybe_const_operands, | |
1128 maybe_const_itself); | |
1129 STRIP_TYPE_NOPS (op1); | |
1130 op1 = decl_constant_value_for_optimization (op1); | |
1131 if (op0 != orig_op0 || op1 != orig_op1) | |
1132 ret = build4 (ARRAY_REF, TREE_TYPE (expr), op0, op1, op2, op3); | |
1133 if (ret != expr) | |
1134 { | |
1135 TREE_READONLY (ret) = TREE_READONLY (expr); | |
1136 TREE_SIDE_EFFECTS (ret) = TREE_SIDE_EFFECTS (expr); | |
1137 TREE_THIS_VOLATILE (ret) = TREE_THIS_VOLATILE (expr); | |
1138 } | |
1139 ret = fold (ret); | |
1140 goto out; | |
1141 | |
1142 case COMPOUND_EXPR: | |
1143 case MODIFY_EXPR: | |
1144 case PREDECREMENT_EXPR: | |
1145 case PREINCREMENT_EXPR: | |
1146 case POSTDECREMENT_EXPR: | |
1147 case POSTINCREMENT_EXPR: | |
1148 case PLUS_EXPR: | |
1149 case MINUS_EXPR: | |
1150 case MULT_EXPR: | |
1151 case POINTER_PLUS_EXPR: | |
1152 case TRUNC_DIV_EXPR: | |
1153 case CEIL_DIV_EXPR: | |
1154 case FLOOR_DIV_EXPR: | |
1155 case TRUNC_MOD_EXPR: | |
1156 case RDIV_EXPR: | |
1157 case EXACT_DIV_EXPR: | |
1158 case LSHIFT_EXPR: | |
1159 case RSHIFT_EXPR: | |
1160 case BIT_IOR_EXPR: | |
1161 case BIT_XOR_EXPR: | |
1162 case BIT_AND_EXPR: | |
1163 case LT_EXPR: | |
1164 case LE_EXPR: | |
1165 case GT_EXPR: | |
1166 case GE_EXPR: | |
1167 case EQ_EXPR: | |
1168 case NE_EXPR: | |
1169 case COMPLEX_EXPR: | |
1170 case TRUTH_AND_EXPR: | |
1171 case TRUTH_OR_EXPR: | |
1172 case TRUTH_XOR_EXPR: | |
1173 case UNORDERED_EXPR: | |
1174 case ORDERED_EXPR: | |
1175 case UNLT_EXPR: | |
1176 case UNLE_EXPR: | |
1177 case UNGT_EXPR: | |
1178 case UNGE_EXPR: | |
1179 case UNEQ_EXPR: | |
1180 /* Binary operations evaluating both arguments (increment and | |
1181 decrement are binary internally in GCC). */ | |
1182 orig_op0 = op0 = TREE_OPERAND (expr, 0); | |
1183 orig_op1 = op1 = TREE_OPERAND (expr, 1); | |
1184 op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands, | |
1185 maybe_const_itself); | |
1186 STRIP_TYPE_NOPS (op0); | |
1187 if (code != MODIFY_EXPR | |
1188 && code != PREDECREMENT_EXPR | |
1189 && code != PREINCREMENT_EXPR | |
1190 && code != POSTDECREMENT_EXPR | |
1191 && code != POSTINCREMENT_EXPR) | |
1192 op0 = decl_constant_value_for_optimization (op0); | |
1193 /* The RHS of a MODIFY_EXPR was fully folded when building that | |
1194 expression for the sake of conversion warnings. */ | |
1195 if (code != MODIFY_EXPR) | |
1196 op1 = c_fully_fold_internal (op1, in_init, maybe_const_operands, | |
1197 maybe_const_itself); | |
1198 STRIP_TYPE_NOPS (op1); | |
1199 op1 = decl_constant_value_for_optimization (op1); | |
1200 if (op0 != orig_op0 || op1 != orig_op1 || in_init) | |
1201 ret = in_init | |
1202 ? fold_build2_initializer_loc (loc, code, TREE_TYPE (expr), op0, op1) | |
1203 : fold_build2_loc (loc, code, TREE_TYPE (expr), op0, op1); | |
1204 else | |
1205 ret = fold (expr); | |
1206 if (TREE_OVERFLOW_P (ret) | |
1207 && !TREE_OVERFLOW_P (op0) | |
1208 && !TREE_OVERFLOW_P (op1)) | |
1209 overflow_warning (EXPR_LOCATION (expr), ret); | |
1210 goto out; | |
1211 | |
1212 case INDIRECT_REF: | |
1213 case FIX_TRUNC_EXPR: | |
1214 case FLOAT_EXPR: | |
1215 CASE_CONVERT: | |
1216 case VIEW_CONVERT_EXPR: | |
1217 case NON_LVALUE_EXPR: | |
1218 case NEGATE_EXPR: | |
1219 case BIT_NOT_EXPR: | |
1220 case TRUTH_NOT_EXPR: | |
1221 case ADDR_EXPR: | |
1222 case CONJ_EXPR: | |
1223 case REALPART_EXPR: | |
1224 case IMAGPART_EXPR: | |
1225 /* Unary operations. */ | |
1226 orig_op0 = op0 = TREE_OPERAND (expr, 0); | |
1227 op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands, | |
1228 maybe_const_itself); | |
1229 STRIP_TYPE_NOPS (op0); | |
1230 if (code != ADDR_EXPR && code != REALPART_EXPR && code != IMAGPART_EXPR) | |
1231 op0 = decl_constant_value_for_optimization (op0); | |
1232 if (op0 != orig_op0 || in_init) | |
1233 ret = in_init | |
1234 ? fold_build1_initializer_loc (loc, code, TREE_TYPE (expr), op0) | |
1235 : fold_build1_loc (loc, code, TREE_TYPE (expr), op0); | |
1236 else | |
1237 ret = fold (expr); | |
1238 if (code == INDIRECT_REF | |
1239 && ret != expr | |
1240 && TREE_CODE (ret) == INDIRECT_REF) | |
1241 { | |
1242 TREE_READONLY (ret) = TREE_READONLY (expr); | |
1243 TREE_SIDE_EFFECTS (ret) = TREE_SIDE_EFFECTS (expr); | |
1244 TREE_THIS_VOLATILE (ret) = TREE_THIS_VOLATILE (expr); | |
1245 } | |
1246 switch (code) | |
1247 { | |
1248 case FIX_TRUNC_EXPR: | |
1249 case FLOAT_EXPR: | |
1250 CASE_CONVERT: | |
1251 /* Don't warn about explicit conversions. We will already | |
1252 have warned about suspect implicit conversions. */ | |
1253 break; | |
1254 | |
1255 default: | |
1256 if (TREE_OVERFLOW_P (ret) && !TREE_OVERFLOW_P (op0)) | |
1257 overflow_warning (EXPR_LOCATION (expr), ret); | |
1258 break; | |
1259 } | |
1260 goto out; | |
1261 | |
1262 case TRUTH_ANDIF_EXPR: | |
1263 case TRUTH_ORIF_EXPR: | |
1264 /* Binary operations not necessarily evaluating both | |
1265 arguments. */ | |
1266 orig_op0 = op0 = TREE_OPERAND (expr, 0); | |
1267 orig_op1 = op1 = TREE_OPERAND (expr, 1); | |
1268 op0 = c_fully_fold_internal (op0, in_init, &op0_const, &op0_const_self); | |
1269 STRIP_TYPE_NOPS (op0); | |
1270 | |
1271 unused_p = (op0 == (code == TRUTH_ANDIF_EXPR | |
1272 ? truthvalue_false_node | |
1273 : truthvalue_true_node)); | |
1274 c_inhibit_evaluation_warnings += unused_p; | |
1275 op1 = c_fully_fold_internal (op1, in_init, &op1_const, &op1_const_self); | |
1276 STRIP_TYPE_NOPS (op1); | |
1277 c_inhibit_evaluation_warnings -= unused_p; | |
1278 | |
1279 if (op0 != orig_op0 || op1 != orig_op1 || in_init) | |
1280 ret = in_init | |
1281 ? fold_build2_initializer_loc (loc, code, TREE_TYPE (expr), op0, op1) | |
1282 : fold_build2_loc (loc, code, TREE_TYPE (expr), op0, op1); | |
1283 else | |
1284 ret = fold (expr); | |
1285 *maybe_const_operands &= op0_const; | |
1286 *maybe_const_itself &= op0_const_self; | |
1287 if (!(flag_isoc99 | |
1288 && op0_const | |
1289 && op0_const_self | |
1290 && (code == TRUTH_ANDIF_EXPR | |
1291 ? op0 == truthvalue_false_node | |
1292 : op0 == truthvalue_true_node))) | |
1293 *maybe_const_operands &= op1_const; | |
1294 if (!(op0_const | |
1295 && op0_const_self | |
1296 && (code == TRUTH_ANDIF_EXPR | |
1297 ? op0 == truthvalue_false_node | |
1298 : op0 == truthvalue_true_node))) | |
1299 *maybe_const_itself &= op1_const_self; | |
1300 goto out; | |
1301 | |
1302 case COND_EXPR: | |
1303 orig_op0 = op0 = TREE_OPERAND (expr, 0); | |
1304 orig_op1 = op1 = TREE_OPERAND (expr, 1); | |
1305 orig_op2 = op2 = TREE_OPERAND (expr, 2); | |
1306 op0 = c_fully_fold_internal (op0, in_init, &op0_const, &op0_const_self); | |
1307 | |
1308 STRIP_TYPE_NOPS (op0); | |
1309 c_inhibit_evaluation_warnings += (op0 == truthvalue_false_node); | |
1310 op1 = c_fully_fold_internal (op1, in_init, &op1_const, &op1_const_self); | |
1311 STRIP_TYPE_NOPS (op1); | |
1312 c_inhibit_evaluation_warnings -= (op0 == truthvalue_false_node); | |
1313 | |
1314 c_inhibit_evaluation_warnings += (op0 == truthvalue_true_node); | |
1315 op2 = c_fully_fold_internal (op2, in_init, &op2_const, &op2_const_self); | |
1316 STRIP_TYPE_NOPS (op2); | |
1317 c_inhibit_evaluation_warnings -= (op0 == truthvalue_true_node); | |
1318 | |
1319 if (op0 != orig_op0 || op1 != orig_op1 || op2 != orig_op2) | |
1320 ret = fold_build3_loc (loc, code, TREE_TYPE (expr), op0, op1, op2); | |
1321 else | |
1322 ret = fold (expr); | |
1323 *maybe_const_operands &= op0_const; | |
1324 *maybe_const_itself &= op0_const_self; | |
1325 if (!(flag_isoc99 | |
1326 && op0_const | |
1327 && op0_const_self | |
1328 && op0 == truthvalue_false_node)) | |
1329 *maybe_const_operands &= op1_const; | |
1330 if (!(op0_const | |
1331 && op0_const_self | |
1332 && op0 == truthvalue_false_node)) | |
1333 *maybe_const_itself &= op1_const_self; | |
1334 if (!(flag_isoc99 | |
1335 && op0_const | |
1336 && op0_const_self | |
1337 && op0 == truthvalue_true_node)) | |
1338 *maybe_const_operands &= op2_const; | |
1339 if (!(op0_const | |
1340 && op0_const_self | |
1341 && op0 == truthvalue_true_node)) | |
1342 *maybe_const_itself &= op2_const_self; | |
1343 goto out; | |
1344 | |
1345 case EXCESS_PRECISION_EXPR: | |
1346 /* Each case where an operand with excess precision may be | |
1347 encountered must remove the EXCESS_PRECISION_EXPR around | |
1348 inner operands and possibly put one around the whole | |
1349 expression or possibly convert to the semantic type (which | |
1350 c_fully_fold does); we cannot tell at this stage which is | |
1351 appropriate in any particular case. */ | |
1352 gcc_unreachable (); | |
1353 | |
1354 default: | |
1355 /* Various codes may appear through folding built-in functions | |
1356 and their arguments. */ | |
1357 goto out; | |
1358 } | |
1359 | |
1360 out: | |
1361 /* Some folding may introduce NON_LVALUE_EXPRs; all lvalue checks | |
1362 have been done by this point, so remove them again. */ | |
1363 nowarning |= TREE_NO_WARNING (ret); | |
1364 STRIP_TYPE_NOPS (ret); | |
1365 if (nowarning && !TREE_NO_WARNING (ret)) | |
1366 { | |
1367 if (!CAN_HAVE_LOCATION_P (ret)) | |
1368 ret = build1 (NOP_EXPR, TREE_TYPE (ret), ret); | |
1369 TREE_NO_WARNING (ret) = 1; | |
1370 } | |
1371 if (ret != expr) | |
1372 protected_set_expr_location (ret, loc); | |
1373 return ret; | |
1374 } | |
1375 | |
1376 /* If not optimizing, EXP is not a VAR_DECL, or EXP has array type, | |
1377 return EXP. Otherwise, return either EXP or its known constant | |
1378 value (if it has one), but return EXP if EXP has mode BLKmode. ??? | |
1379 Is the BLKmode test appropriate? */ | |
1380 | |
1381 tree | |
1382 decl_constant_value_for_optimization (tree exp) | |
1383 { | |
1384 tree ret; | |
1385 | |
1386 /* This function is only used by C, for c_fully_fold and other | |
1387 optimization, and may not be correct for C++. */ | |
1388 if (c_dialect_cxx ()) | |
1389 gcc_unreachable (); | |
1390 | |
1391 if (!optimize | |
1392 || TREE_CODE (exp) != VAR_DECL | |
1393 || TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE | |
1394 || DECL_MODE (exp) == BLKmode) | |
1395 return exp; | |
1396 | |
1397 ret = decl_constant_value (exp); | |
1398 /* Avoid unwanted tree sharing between the initializer and current | |
1399 function's body where the tree can be modified e.g. by the | |
1400 gimplifier. */ | |
1401 if (ret != exp && TREE_STATIC (exp)) | |
1402 ret = unshare_expr (ret); | |
1403 return ret; | |
1404 } | |
1405 | |
1406 /* Print a warning if a constant expression had overflow in folding. | |
1407 Invoke this function on every expression that the language | |
1408 requires to be a constant expression. | |
1409 Note the ANSI C standard says it is erroneous for a | |
1410 constant expression to overflow. */ | |
1411 | |
1412 void | |
1413 constant_expression_warning (tree value) | |
1414 { | |
1415 if (warn_overflow && pedantic | |
1416 && (TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST | |
1417 || TREE_CODE (value) == FIXED_CST | |
1418 || TREE_CODE (value) == VECTOR_CST | |
1419 || TREE_CODE (value) == COMPLEX_CST) | |
1420 && TREE_OVERFLOW (value)) | |
1421 pedwarn (input_location, OPT_Woverflow, "overflow in constant expression"); | |
1422 } | |
1423 | |
1424 /* The same as above but print an unconditional error. */ | |
1425 void | |
1426 constant_expression_error (tree value) | |
1427 { | |
1428 if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST | |
1429 || TREE_CODE (value) == FIXED_CST | |
1430 || TREE_CODE (value) == VECTOR_CST | |
1431 || TREE_CODE (value) == COMPLEX_CST) | |
1432 && TREE_OVERFLOW (value)) | |
1433 error ("overflow in constant expression"); | |
1434 } | |
1435 | |
1436 /* Print a warning if an expression had overflow in folding and its | |
1437 operands hadn't. | |
1438 | |
1439 Invoke this function on every expression that | |
1440 (1) appears in the source code, and | |
1441 (2) is a constant expression that overflowed, and | |
1442 (3) is not already checked by convert_and_check; | |
1443 however, do not invoke this function on operands of explicit casts | |
1444 or when the expression is the result of an operator and any operand | |
1445 already overflowed. */ | |
1446 | |
1447 void | |
1448 overflow_warning (location_t loc, tree value) | |
1449 { | |
1450 if (c_inhibit_evaluation_warnings != 0) | |
1451 return; | |
1452 | |
1453 switch (TREE_CODE (value)) | |
1454 { | |
1455 case INTEGER_CST: | |
1456 warning_at (loc, OPT_Woverflow, "integer overflow in expression"); | |
1457 break; | |
1458 | |
1459 case REAL_CST: | |
1460 warning_at (loc, OPT_Woverflow, | |
1461 "floating point overflow in expression"); | |
1462 break; | |
1463 | |
1464 case FIXED_CST: | |
1465 warning_at (loc, OPT_Woverflow, "fixed-point overflow in expression"); | |
1466 break; | |
1467 | |
1468 case VECTOR_CST: | |
1469 warning_at (loc, OPT_Woverflow, "vector overflow in expression"); | |
1470 break; | |
1471 | |
1472 case COMPLEX_CST: | |
1473 if (TREE_CODE (TREE_REALPART (value)) == INTEGER_CST) | |
1474 warning_at (loc, OPT_Woverflow, | |
1475 "complex integer overflow in expression"); | |
1476 else if (TREE_CODE (TREE_REALPART (value)) == REAL_CST) | |
1477 warning_at (loc, OPT_Woverflow, | |
1478 "complex floating point overflow in expression"); | |
1479 break; | |
1480 | |
1481 default: | |
1482 break; | |
1483 } | |
1484 } | |
1485 | |
1486 /* Warn about uses of logical || / && operator in a context where it | |
1487 is likely that the bitwise equivalent was intended by the | |
1488 programmer. We have seen an expression in which CODE is a binary | |
1489 operator used to combine expressions OP_LEFT and OP_RIGHT, which before folding | |
1490 had CODE_LEFT and CODE_RIGHT, into an expression of type TYPE. */ | |
1491 void | |
1492 warn_logical_operator (location_t location, enum tree_code code, tree type, | |
1493 enum tree_code code_left, tree op_left, | |
1494 enum tree_code ARG_UNUSED (code_right), tree op_right) | |
1495 { | |
1496 int or_op = (code == TRUTH_ORIF_EXPR || code == TRUTH_OR_EXPR); | |
1497 int in0_p, in1_p, in_p; | |
1498 tree low0, low1, low, high0, high1, high, lhs, rhs, tem; | |
1499 bool strict_overflow_p = false; | |
1500 | |
1501 if (code != TRUTH_ANDIF_EXPR | |
1502 && code != TRUTH_AND_EXPR | |
1503 && code != TRUTH_ORIF_EXPR | |
1504 && code != TRUTH_OR_EXPR) | |
1505 return; | |
1506 | |
1507 /* Warn if &&/|| are being used in a context where it is | |
1508 likely that the bitwise equivalent was intended by the | |
1509 programmer. That is, an expression such as op && MASK | |
1510 where op should not be any boolean expression, nor a | |
1511 constant, and mask seems to be a non-boolean integer constant. */ | |
1512 if (!truth_value_p (code_left) | |
1513 && INTEGRAL_TYPE_P (TREE_TYPE (op_left)) | |
1514 && !CONSTANT_CLASS_P (op_left) | |
1515 && !TREE_NO_WARNING (op_left) | |
1516 && TREE_CODE (op_right) == INTEGER_CST | |
1517 && !integer_zerop (op_right) | |
1518 && !integer_onep (op_right)) | |
1519 { | |
1520 if (or_op) | |
1521 warning_at (location, OPT_Wlogical_op, "logical %<or%>" | |
1522 " applied to non-boolean constant"); | |
1523 else | |
1524 warning_at (location, OPT_Wlogical_op, "logical %<and%>" | |
1525 " applied to non-boolean constant"); | |
1526 TREE_NO_WARNING (op_left) = true; | |
1527 return; | |
1528 } | |
1529 | |
1530 /* We do not warn for constants because they are typical of macro | |
1531 expansions that test for features. */ | |
1532 if (CONSTANT_CLASS_P (op_left) || CONSTANT_CLASS_P (op_right)) | |
1533 return; | |
1534 | |
1535 /* This warning only makes sense with logical operands. */ | |
1536 if (!(truth_value_p (TREE_CODE (op_left)) | |
1537 || INTEGRAL_TYPE_P (TREE_TYPE (op_left))) | |
1538 || !(truth_value_p (TREE_CODE (op_right)) | |
1539 || INTEGRAL_TYPE_P (TREE_TYPE (op_right)))) | |
1540 return; | |
1541 | |
1542 lhs = make_range (op_left, &in0_p, &low0, &high0, &strict_overflow_p); | |
1543 rhs = make_range (op_right, &in1_p, &low1, &high1, &strict_overflow_p); | |
1544 | |
1545 if (lhs && TREE_CODE (lhs) == C_MAYBE_CONST_EXPR) | |
1546 lhs = C_MAYBE_CONST_EXPR_EXPR (lhs); | |
1547 | |
1548 if (rhs && TREE_CODE (rhs) == C_MAYBE_CONST_EXPR) | |
1549 rhs = C_MAYBE_CONST_EXPR_EXPR (rhs); | |
1550 | |
1551 /* If this is an OR operation, invert both sides; we will invert | |
1552 again at the end. */ | |
1553 if (or_op) | |
1554 in0_p = !in0_p, in1_p = !in1_p; | |
1555 | |
1556 /* If both expressions are the same, if we can merge the ranges, and we | |
1557 can build the range test, return it or it inverted. */ | |
1558 if (lhs && rhs && operand_equal_p (lhs, rhs, 0) | |
1559 && merge_ranges (&in_p, &low, &high, in0_p, low0, high0, | |
1560 in1_p, low1, high1) | |
1561 && 0 != (tem = build_range_check (UNKNOWN_LOCATION, | |
1562 type, lhs, in_p, low, high))) | |
1563 { | |
1564 if (TREE_CODE (tem) != INTEGER_CST) | |
1565 return; | |
1566 | |
1567 if (or_op) | |
1568 warning_at (location, OPT_Wlogical_op, | |
1569 "logical %<or%> " | |
1570 "of collectively exhaustive tests is always true"); | |
1571 else | |
1572 warning_at (location, OPT_Wlogical_op, | |
1573 "logical %<and%> " | |
1574 "of mutually exclusive tests is always false"); | |
1575 } | |
1576 } | |
1577 | |
1578 | |
1579 /* Print a warning about casts that might indicate violation | |
1580 of strict aliasing rules if -Wstrict-aliasing is used and | |
1581 strict aliasing mode is in effect. OTYPE is the original | |
1582 TREE_TYPE of EXPR, and TYPE the type we're casting to. */ | |
1583 | |
1584 bool | |
1585 strict_aliasing_warning (tree otype, tree type, tree expr) | |
1586 { | |
1587 /* Strip pointer conversion chains and get to the correct original type. */ | |
1588 STRIP_NOPS (expr); | |
1589 otype = TREE_TYPE (expr); | |
1590 | |
1591 if (!(flag_strict_aliasing | |
1592 && POINTER_TYPE_P (type) | |
1593 && POINTER_TYPE_P (otype) | |
1594 && !VOID_TYPE_P (TREE_TYPE (type))) | |
1595 /* If the type we are casting to is a ref-all pointer | |
1596 dereferencing it is always valid. */ | |
1597 || TYPE_REF_CAN_ALIAS_ALL (type)) | |
1598 return false; | |
1599 | |
1600 if ((warn_strict_aliasing > 1) && TREE_CODE (expr) == ADDR_EXPR | |
1601 && (DECL_P (TREE_OPERAND (expr, 0)) | |
1602 || handled_component_p (TREE_OPERAND (expr, 0)))) | |
1603 { | |
1604 /* Casting the address of an object to non void pointer. Warn | |
1605 if the cast breaks type based aliasing. */ | |
1606 if (!COMPLETE_TYPE_P (TREE_TYPE (type)) && warn_strict_aliasing == 2) | |
1607 { | |
1608 warning (OPT_Wstrict_aliasing, "type-punning to incomplete type " | |
1609 "might break strict-aliasing rules"); | |
1610 return true; | |
1611 } | |
1612 else | |
1613 { | |
1614 /* warn_strict_aliasing >= 3. This includes the default (3). | |
1615 Only warn if the cast is dereferenced immediately. */ | |
1616 alias_set_type set1 = | |
1617 get_alias_set (TREE_TYPE (TREE_OPERAND (expr, 0))); | |
1618 alias_set_type set2 = get_alias_set (TREE_TYPE (type)); | |
1619 | |
1620 if (set1 != set2 && set2 != 0 | |
1621 && (set1 == 0 || !alias_sets_conflict_p (set1, set2))) | |
1622 { | |
1623 warning (OPT_Wstrict_aliasing, "dereferencing type-punned " | |
1624 "pointer will break strict-aliasing rules"); | |
1625 return true; | |
1626 } | |
1627 else if (warn_strict_aliasing == 2 | |
1628 && !alias_sets_must_conflict_p (set1, set2)) | |
1629 { | |
1630 warning (OPT_Wstrict_aliasing, "dereferencing type-punned " | |
1631 "pointer might break strict-aliasing rules"); | |
1632 return true; | |
1633 } | |
1634 } | |
1635 } | |
1636 else | |
1637 if ((warn_strict_aliasing == 1) && !VOID_TYPE_P (TREE_TYPE (otype))) | |
1638 { | |
1639 /* At this level, warn for any conversions, even if an address is | |
1640 not taken in the same statement. This will likely produce many | |
1641 false positives, but could be useful to pinpoint problems that | |
1642 are not revealed at higher levels. */ | |
1643 alias_set_type set1 = get_alias_set (TREE_TYPE (otype)); | |
1644 alias_set_type set2 = get_alias_set (TREE_TYPE (type)); | |
1645 if (!COMPLETE_TYPE_P (type) | |
1646 || !alias_sets_must_conflict_p (set1, set2)) | |
1647 { | |
1648 warning (OPT_Wstrict_aliasing, "dereferencing type-punned " | |
1649 "pointer might break strict-aliasing rules"); | |
1650 return true; | |
1651 } | |
1652 } | |
1653 | |
1654 return false; | |
1655 } | |
1656 | |
1657 /* Warn for unlikely, improbable, or stupid DECL declarations | |
1658 of `main'. */ | |
1659 | |
1660 void | |
1661 check_main_parameter_types (tree decl) | |
1662 { | |
1663 tree args; | |
1664 int argct = 0; | |
1665 | |
1666 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl)); args; | |
1667 args = TREE_CHAIN (args)) | |
1668 { | |
1669 tree type = args ? TREE_VALUE (args) : 0; | |
1670 | |
1671 if (type == void_type_node || type == error_mark_node ) | |
1672 break; | |
1673 | |
1674 ++argct; | |
1675 switch (argct) | |
1676 { | |
1677 case 1: | |
1678 if (TYPE_MAIN_VARIANT (type) != integer_type_node) | |
1679 pedwarn (input_location, OPT_Wmain, "first argument of %q+D should be %<int%>", | |
1680 decl); | |
1681 break; | |
1682 | |
1683 case 2: | |
1684 if (TREE_CODE (type) != POINTER_TYPE | |
1685 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE | |
1686 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))) | |
1687 != char_type_node)) | |
1688 pedwarn (input_location, OPT_Wmain, "second argument of %q+D should be %<char **%>", | |
1689 decl); | |
1690 break; | |
1691 | |
1692 case 3: | |
1693 if (TREE_CODE (type) != POINTER_TYPE | |
1694 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE | |
1695 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))) | |
1696 != char_type_node)) | |
1697 pedwarn (input_location, OPT_Wmain, "third argument of %q+D should probably be " | |
1698 "%<char **%>", decl); | |
1699 break; | |
1700 } | |
1701 } | |
1702 | |
1703 /* It is intentional that this message does not mention the third | |
1704 argument because it's only mentioned in an appendix of the | |
1705 standard. */ | |
1706 if (argct > 0 && (argct < 2 || argct > 3)) | |
1707 pedwarn (input_location, OPT_Wmain, "%q+D takes only zero or two arguments", decl); | |
1708 } | |
1709 | |
1710 /* True if pointers to distinct types T1 and T2 can be converted to | |
1711 each other without an explicit cast. Only returns true for opaque | |
1712 vector types. */ | |
1713 bool | |
1714 vector_targets_convertible_p (const_tree t1, const_tree t2) | |
1715 { | |
1716 if (TREE_CODE (t1) == VECTOR_TYPE && TREE_CODE (t2) == VECTOR_TYPE | |
1717 && (TYPE_VECTOR_OPAQUE (t1) || TYPE_VECTOR_OPAQUE (t2)) | |
1718 && tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2))) | |
1719 return true; | |
1720 | |
1721 return false; | |
1722 } | |
1723 | |
1724 /* True if vector types T1 and T2 can be converted to each other | |
1725 without an explicit cast. If EMIT_LAX_NOTE is true, and T1 and T2 | |
1726 can only be converted with -flax-vector-conversions yet that is not | |
1727 in effect, emit a note telling the user about that option if such | |
1728 a note has not previously been emitted. */ | |
1729 bool | |
1730 vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note) | |
1731 { | |
1732 static bool emitted_lax_note = false; | |
1733 bool convertible_lax; | |
1734 | |
1735 if ((TYPE_VECTOR_OPAQUE (t1) || TYPE_VECTOR_OPAQUE (t2)) | |
1736 && tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2))) | |
1737 return true; | |
1738 | |
1739 convertible_lax = | |
1740 (tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2)) | |
1741 && (TREE_CODE (TREE_TYPE (t1)) != REAL_TYPE || | |
1742 TYPE_PRECISION (t1) == TYPE_PRECISION (t2)) | |
1743 && (INTEGRAL_TYPE_P (TREE_TYPE (t1)) | |
1744 == INTEGRAL_TYPE_P (TREE_TYPE (t2)))); | |
1745 | |
1746 if (!convertible_lax || flag_lax_vector_conversions) | |
1747 return convertible_lax; | |
1748 | |
1749 if (TYPE_VECTOR_SUBPARTS (t1) == TYPE_VECTOR_SUBPARTS (t2) | |
1750 && lang_hooks.types_compatible_p (TREE_TYPE (t1), TREE_TYPE (t2))) | |
1751 return true; | |
1752 | |
1753 if (emit_lax_note && !emitted_lax_note) | |
1754 { | |
1755 emitted_lax_note = true; | |
1756 inform (input_location, "use -flax-vector-conversions to permit " | |
1757 "conversions between vectors with differing " | |
1758 "element types or numbers of subparts"); | |
1759 } | |
1760 | |
1761 return false; | |
1762 } | |
1763 | |
1764 /* This is a helper function of build_binary_op. | |
1765 | |
1766 For certain operations if both args were extended from the same | |
1767 smaller type, do the arithmetic in that type and then extend. | |
1768 | |
1769 BITWISE indicates a bitwise operation. | |
1770 For them, this optimization is safe only if | |
1771 both args are zero-extended or both are sign-extended. | |
1772 Otherwise, we might change the result. | |
1773 Eg, (short)-1 | (unsigned short)-1 is (int)-1 | |
1774 but calculated in (unsigned short) it would be (unsigned short)-1. | |
1775 */ | |
1776 tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise) | |
1777 { | |
1778 int unsigned0, unsigned1; | |
1779 tree arg0, arg1; | |
1780 int uns; | |
1781 tree type; | |
1782 | |
1783 /* Cast OP0 and OP1 to RESULT_TYPE. Doing so prevents | |
1784 excessive narrowing when we call get_narrower below. For | |
1785 example, suppose that OP0 is of unsigned int extended | |
1786 from signed char and that RESULT_TYPE is long long int. | |
1787 If we explicitly cast OP0 to RESULT_TYPE, OP0 would look | |
1788 like | |
1789 | |
1790 (long long int) (unsigned int) signed_char | |
1791 | |
1792 which get_narrower would narrow down to | |
1793 | |
1794 (unsigned int) signed char | |
1795 | |
1796 If we do not cast OP0 first, get_narrower would return | |
1797 signed_char, which is inconsistent with the case of the | |
1798 explicit cast. */ | |
1799 op0 = convert (result_type, op0); | |
1800 op1 = convert (result_type, op1); | |
1801 | |
1802 arg0 = get_narrower (op0, &unsigned0); | |
1803 arg1 = get_narrower (op1, &unsigned1); | |
1804 | |
1805 /* UNS is 1 if the operation to be done is an unsigned one. */ | |
1806 uns = TYPE_UNSIGNED (result_type); | |
1807 | |
1808 /* Handle the case that OP0 (or OP1) does not *contain* a conversion | |
1809 but it *requires* conversion to FINAL_TYPE. */ | |
1810 | |
1811 if ((TYPE_PRECISION (TREE_TYPE (op0)) | |
1812 == TYPE_PRECISION (TREE_TYPE (arg0))) | |
1813 && TREE_TYPE (op0) != result_type) | |
1814 unsigned0 = TYPE_UNSIGNED (TREE_TYPE (op0)); | |
1815 if ((TYPE_PRECISION (TREE_TYPE (op1)) | |
1816 == TYPE_PRECISION (TREE_TYPE (arg1))) | |
1817 && TREE_TYPE (op1) != result_type) | |
1818 unsigned1 = TYPE_UNSIGNED (TREE_TYPE (op1)); | |
1819 | |
1820 /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */ | |
1821 | |
1822 /* For bitwise operations, signedness of nominal type | |
1823 does not matter. Consider only how operands were extended. */ | |
1824 if (bitwise) | |
1825 uns = unsigned0; | |
1826 | |
1827 /* Note that in all three cases below we refrain from optimizing | |
1828 an unsigned operation on sign-extended args. | |
1829 That would not be valid. */ | |
1830 | |
1831 /* Both args variable: if both extended in same way | |
1832 from same width, do it in that width. | |
1833 Do it unsigned if args were zero-extended. */ | |
1834 if ((TYPE_PRECISION (TREE_TYPE (arg0)) | |
1835 < TYPE_PRECISION (result_type)) | |
1836 && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
1837 == TYPE_PRECISION (TREE_TYPE (arg0))) | |
1838 && unsigned0 == unsigned1 | |
1839 && (unsigned0 || !uns)) | |
1840 return c_common_signed_or_unsigned_type | |
1841 (unsigned0, common_type (TREE_TYPE (arg0), TREE_TYPE (arg1))); | |
1842 | |
1843 else if (TREE_CODE (arg0) == INTEGER_CST | |
1844 && (unsigned1 || !uns) | |
1845 && (TYPE_PRECISION (TREE_TYPE (arg1)) | |
1846 < TYPE_PRECISION (result_type)) | |
1847 && (type | |
1848 = c_common_signed_or_unsigned_type (unsigned1, | |
1849 TREE_TYPE (arg1))) | |
1850 && !POINTER_TYPE_P (type) | |
1851 && int_fits_type_p (arg0, type)) | |
1852 return type; | |
1853 | |
1854 else if (TREE_CODE (arg1) == INTEGER_CST | |
1855 && (unsigned0 || !uns) | |
1856 && (TYPE_PRECISION (TREE_TYPE (arg0)) | |
1857 < TYPE_PRECISION (result_type)) | |
1858 && (type | |
1859 = c_common_signed_or_unsigned_type (unsigned0, | |
1860 TREE_TYPE (arg0))) | |
1861 && !POINTER_TYPE_P (type) | |
1862 && int_fits_type_p (arg1, type)) | |
1863 return type; | |
1864 | |
1865 return result_type; | |
1866 } | |
1867 | |
1868 /* Warns if the conversion of EXPR to TYPE may alter a value. | |
1869 This is a helper function for warnings_for_convert_and_check. */ | |
1870 | |
1871 static void | |
1872 conversion_warning (tree type, tree expr) | |
1873 { | |
1874 bool give_warning = false; | |
1875 | |
1876 int i; | |
1877 const int expr_num_operands = TREE_OPERAND_LENGTH (expr); | |
1878 tree expr_type = TREE_TYPE (expr); | |
1879 location_t loc = EXPR_LOC_OR_HERE (expr); | |
1880 | |
1881 if (!warn_conversion && !warn_sign_conversion) | |
1882 return; | |
1883 | |
1884 /* If any operand is artificial, then this expression was generated | |
1885 by the compiler and we do not warn. */ | |
1886 for (i = 0; i < expr_num_operands; i++) | |
1887 { | |
1888 tree op = TREE_OPERAND (expr, i); | |
1889 if (op && DECL_P (op) && DECL_ARTIFICIAL (op)) | |
1890 return; | |
1891 } | |
1892 | |
1893 switch (TREE_CODE (expr)) | |
1894 { | |
1895 case EQ_EXPR: | |
1896 case NE_EXPR: | |
1897 case LE_EXPR: | |
1898 case GE_EXPR: | |
1899 case LT_EXPR: | |
1900 case GT_EXPR: | |
1901 case TRUTH_ANDIF_EXPR: | |
1902 case TRUTH_ORIF_EXPR: | |
1903 case TRUTH_AND_EXPR: | |
1904 case TRUTH_OR_EXPR: | |
1905 case TRUTH_XOR_EXPR: | |
1906 case TRUTH_NOT_EXPR: | |
1907 /* Conversion from boolean to a signed:1 bit-field (which only | |
1908 can hold the values 0 and -1) doesn't lose information - but | |
1909 it does change the value. */ | |
1910 if (TYPE_PRECISION (type) == 1 && !TYPE_UNSIGNED (type)) | |
1911 warning_at (loc, OPT_Wconversion, | |
1912 "conversion to %qT from boolean expression", type); | |
1913 return; | |
1914 | |
1915 case REAL_CST: | |
1916 case INTEGER_CST: | |
1917 | |
1918 /* Warn for real constant that is not an exact integer converted | |
1919 to integer type. */ | |
1920 if (TREE_CODE (expr_type) == REAL_TYPE | |
1921 && TREE_CODE (type) == INTEGER_TYPE) | |
1922 { | |
1923 if (!real_isinteger (TREE_REAL_CST_PTR (expr), TYPE_MODE (expr_type))) | |
1924 give_warning = true; | |
1925 } | |
1926 /* Warn for an integer constant that does not fit into integer type. */ | |
1927 else if (TREE_CODE (expr_type) == INTEGER_TYPE | |
1928 && TREE_CODE (type) == INTEGER_TYPE | |
1929 && !int_fits_type_p (expr, type)) | |
1930 { | |
1931 if (TYPE_UNSIGNED (type) && !TYPE_UNSIGNED (expr_type) | |
1932 && tree_int_cst_sgn (expr) < 0) | |
1933 warning_at (loc, OPT_Wsign_conversion, "negative integer" | |
1934 " implicitly converted to unsigned type"); | |
1935 else if (!TYPE_UNSIGNED (type) && TYPE_UNSIGNED (expr_type)) | |
1936 warning_at (loc, OPT_Wsign_conversion, "conversion of unsigned" | |
1937 " constant value to negative integer"); | |
1938 else | |
1939 give_warning = true; | |
1940 } | |
1941 else if (TREE_CODE (type) == REAL_TYPE) | |
1942 { | |
1943 /* Warn for an integer constant that does not fit into real type. */ | |
1944 if (TREE_CODE (expr_type) == INTEGER_TYPE) | |
1945 { | |
1946 REAL_VALUE_TYPE a = real_value_from_int_cst (0, expr); | |
1947 if (!exact_real_truncate (TYPE_MODE (type), &a)) | |
1948 give_warning = true; | |
1949 } | |
1950 /* Warn for a real constant that does not fit into a smaller | |
1951 real type. */ | |
1952 else if (TREE_CODE (expr_type) == REAL_TYPE | |
1953 && TYPE_PRECISION (type) < TYPE_PRECISION (expr_type)) | |
1954 { | |
1955 REAL_VALUE_TYPE a = TREE_REAL_CST (expr); | |
1956 if (!exact_real_truncate (TYPE_MODE (type), &a)) | |
1957 give_warning = true; | |
1958 } | |
1959 } | |
1960 | |
1961 if (give_warning) | |
1962 warning_at (loc, OPT_Wconversion, | |
1963 "conversion to %qT alters %qT constant value", | |
1964 type, expr_type); | |
1965 | |
1966 return; | |
1967 | |
1968 case COND_EXPR: | |
1969 { | |
1970 /* In case of COND_EXPR, if both operands are constants or | |
1971 COND_EXPR, then we do not care about the type of COND_EXPR, | |
1972 only about the conversion of each operand. */ | |
1973 tree op1 = TREE_OPERAND (expr, 1); | |
1974 tree op2 = TREE_OPERAND (expr, 2); | |
1975 | |
1976 if ((TREE_CODE (op1) == REAL_CST || TREE_CODE (op1) == INTEGER_CST | |
1977 || TREE_CODE (op1) == COND_EXPR) | |
1978 && (TREE_CODE (op2) == REAL_CST || TREE_CODE (op2) == INTEGER_CST | |
1979 || TREE_CODE (op2) == COND_EXPR)) | |
1980 { | |
1981 conversion_warning (type, op1); | |
1982 conversion_warning (type, op2); | |
1983 return; | |
1984 } | |
1985 /* Fall through. */ | |
1986 } | |
1987 | |
1988 default: /* 'expr' is not a constant. */ | |
1989 | |
1990 /* Warn for real types converted to integer types. */ | |
1991 if (TREE_CODE (expr_type) == REAL_TYPE | |
1992 && TREE_CODE (type) == INTEGER_TYPE) | |
1993 give_warning = true; | |
1994 | |
1995 else if (TREE_CODE (expr_type) == INTEGER_TYPE | |
1996 && TREE_CODE (type) == INTEGER_TYPE) | |
1997 { | |
1998 /* Don't warn about unsigned char y = 0xff, x = (int) y; */ | |
1999 expr = get_unwidened (expr, 0); | |
2000 expr_type = TREE_TYPE (expr); | |
2001 | |
2002 /* Don't warn for short y; short x = ((int)y & 0xff); */ | |
2003 if (TREE_CODE (expr) == BIT_AND_EXPR | |
2004 || TREE_CODE (expr) == BIT_IOR_EXPR | |
2005 || TREE_CODE (expr) == BIT_XOR_EXPR) | |
2006 { | |
2007 /* If both args were extended from a shortest type, | |
2008 use that type if that is safe. */ | |
2009 expr_type = shorten_binary_op (expr_type, | |
2010 TREE_OPERAND (expr, 0), | |
2011 TREE_OPERAND (expr, 1), | |
2012 /* bitwise */1); | |
2013 | |
2014 if (TREE_CODE (expr) == BIT_AND_EXPR) | |
2015 { | |
2016 tree op0 = TREE_OPERAND (expr, 0); | |
2017 tree op1 = TREE_OPERAND (expr, 1); | |
2018 bool unsigned0 = TYPE_UNSIGNED (TREE_TYPE (op0)); | |
2019 bool unsigned1 = TYPE_UNSIGNED (TREE_TYPE (op1)); | |
2020 | |
2021 /* If one of the operands is a non-negative constant | |
2022 that fits in the target type, then the type of the | |
2023 other operand does not matter. */ | |
2024 if ((TREE_CODE (op0) == INTEGER_CST | |
2025 && int_fits_type_p (op0, c_common_signed_type (type)) | |
2026 && int_fits_type_p (op0, c_common_unsigned_type (type))) | |
2027 || (TREE_CODE (op1) == INTEGER_CST | |
2028 && int_fits_type_p (op1, c_common_signed_type (type)) | |
2029 && int_fits_type_p (op1, | |
2030 c_common_unsigned_type (type)))) | |
2031 return; | |
2032 /* If constant is unsigned and fits in the target | |
2033 type, then the result will also fit. */ | |
2034 else if ((TREE_CODE (op0) == INTEGER_CST | |
2035 && unsigned0 | |
2036 && int_fits_type_p (op0, type)) | |
2037 || (TREE_CODE (op1) == INTEGER_CST | |
2038 && unsigned1 | |
2039 && int_fits_type_p (op1, type))) | |
2040 return; | |
2041 } | |
2042 } | |
2043 /* Warn for integer types converted to smaller integer types. */ | |
2044 if (TYPE_PRECISION (type) < TYPE_PRECISION (expr_type)) | |
2045 give_warning = true; | |
2046 | |
2047 /* When they are the same width but different signedness, | |
2048 then the value may change. */ | |
2049 else if ((TYPE_PRECISION (type) == TYPE_PRECISION (expr_type) | |
2050 && TYPE_UNSIGNED (expr_type) != TYPE_UNSIGNED (type)) | |
2051 /* Even when converted to a bigger type, if the type is | |
2052 unsigned but expr is signed, then negative values | |
2053 will be changed. */ | |
2054 || (TYPE_UNSIGNED (type) && !TYPE_UNSIGNED (expr_type))) | |
2055 warning_at (loc, OPT_Wsign_conversion, "conversion to %qT from %qT " | |
2056 "may change the sign of the result", | |
2057 type, expr_type); | |
2058 } | |
2059 | |
2060 /* Warn for integer types converted to real types if and only if | |
2061 all the range of values of the integer type cannot be | |
2062 represented by the real type. */ | |
2063 else if (TREE_CODE (expr_type) == INTEGER_TYPE | |
2064 && TREE_CODE (type) == REAL_TYPE) | |
2065 { | |
2066 tree type_low_bound, type_high_bound; | |
2067 REAL_VALUE_TYPE real_low_bound, real_high_bound; | |
2068 | |
2069 /* Don't warn about char y = 0xff; float x = (int) y; */ | |
2070 expr = get_unwidened (expr, 0); | |
2071 expr_type = TREE_TYPE (expr); | |
2072 | |
2073 type_low_bound = TYPE_MIN_VALUE (expr_type); | |
2074 type_high_bound = TYPE_MAX_VALUE (expr_type); | |
2075 real_low_bound = real_value_from_int_cst (0, type_low_bound); | |
2076 real_high_bound = real_value_from_int_cst (0, type_high_bound); | |
2077 | |
2078 if (!exact_real_truncate (TYPE_MODE (type), &real_low_bound) | |
2079 || !exact_real_truncate (TYPE_MODE (type), &real_high_bound)) | |
2080 give_warning = true; | |
2081 } | |
2082 | |
2083 /* Warn for real types converted to smaller real types. */ | |
2084 else if (TREE_CODE (expr_type) == REAL_TYPE | |
2085 && TREE_CODE (type) == REAL_TYPE | |
2086 && TYPE_PRECISION (type) < TYPE_PRECISION (expr_type)) | |
2087 give_warning = true; | |
2088 | |
2089 | |
2090 if (give_warning) | |
2091 warning_at (loc, OPT_Wconversion, | |
2092 "conversion to %qT from %qT may alter its value", | |
2093 type, expr_type); | |
2094 } | |
2095 } | |
2096 | |
2097 /* Produce warnings after a conversion. RESULT is the result of | |
2098 converting EXPR to TYPE. This is a helper function for | |
2099 convert_and_check and cp_convert_and_check. */ | |
2100 | |
2101 void | |
2102 warnings_for_convert_and_check (tree type, tree expr, tree result) | |
2103 { | |
2104 if (TREE_CODE (expr) == INTEGER_CST | |
2105 && (TREE_CODE (type) == INTEGER_TYPE | |
2106 || TREE_CODE (type) == ENUMERAL_TYPE) | |
2107 && !int_fits_type_p (expr, type)) | |
2108 { | |
2109 /* Do not diagnose overflow in a constant expression merely | |
2110 because a conversion overflowed. */ | |
2111 if (TREE_OVERFLOW (result)) | |
2112 TREE_OVERFLOW (result) = TREE_OVERFLOW (expr); | |
2113 | |
2114 if (TYPE_UNSIGNED (type)) | |
2115 { | |
2116 /* This detects cases like converting -129 or 256 to | |
2117 unsigned char. */ | |
2118 if (!int_fits_type_p (expr, c_common_signed_type (type))) | |
2119 warning (OPT_Woverflow, | |
2120 "large integer implicitly truncated to unsigned type"); | |
2121 else | |
2122 conversion_warning (type, expr); | |
2123 } | |
2124 else if (!int_fits_type_p (expr, c_common_unsigned_type (type))) | |
2125 warning (OPT_Woverflow, | |
2126 "overflow in implicit constant conversion"); | |
2127 /* No warning for converting 0x80000000 to int. */ | |
2128 else if (pedantic | |
2129 && (TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE | |
2130 || TYPE_PRECISION (TREE_TYPE (expr)) | |
2131 != TYPE_PRECISION (type))) | |
2132 warning (OPT_Woverflow, | |
2133 "overflow in implicit constant conversion"); | |
2134 | |
2135 else | |
2136 conversion_warning (type, expr); | |
2137 } | |
2138 else if ((TREE_CODE (result) == INTEGER_CST | |
2139 || TREE_CODE (result) == FIXED_CST) && TREE_OVERFLOW (result)) | |
2140 warning (OPT_Woverflow, | |
2141 "overflow in implicit constant conversion"); | |
2142 else | |
2143 conversion_warning (type, expr); | |
2144 } | |
2145 | |
2146 | |
2147 /* Convert EXPR to TYPE, warning about conversion problems with constants. | |
2148 Invoke this function on every expression that is converted implicitly, | |
2149 i.e. because of language rules and not because of an explicit cast. */ | |
2150 | |
2151 tree | |
2152 convert_and_check (tree type, tree expr) | |
2153 { | |
2154 tree result; | |
2155 tree expr_for_warning; | |
2156 | |
2157 /* Convert from a value with possible excess precision rather than | |
2158 via the semantic type, but do not warn about values not fitting | |
2159 exactly in the semantic type. */ | |
2160 if (TREE_CODE (expr) == EXCESS_PRECISION_EXPR) | |
2161 { | |
2162 tree orig_type = TREE_TYPE (expr); | |
2163 expr = TREE_OPERAND (expr, 0); | |
2164 expr_for_warning = convert (orig_type, expr); | |
2165 if (orig_type == type) | |
2166 return expr_for_warning; | |
2167 } | |
2168 else | |
2169 expr_for_warning = expr; | |
2170 | |
2171 if (TREE_TYPE (expr) == type) | |
2172 return expr; | |
2173 | |
2174 result = convert (type, expr); | |
2175 | |
2176 if (c_inhibit_evaluation_warnings == 0 | |
2177 && !TREE_OVERFLOW_P (expr) | |
2178 && result != error_mark_node) | |
2179 warnings_for_convert_and_check (type, expr_for_warning, result); | |
2180 | |
2181 return result; | |
2182 } | |
2183 | |
2184 /* A node in a list that describes references to variables (EXPR), which are | |
2185 either read accesses if WRITER is zero, or write accesses, in which case | |
2186 WRITER is the parent of EXPR. */ | |
2187 struct tlist | |
2188 { | |
2189 struct tlist *next; | |
2190 tree expr, writer; | |
2191 }; | |
2192 | |
2193 /* Used to implement a cache the results of a call to verify_tree. We only | |
2194 use this for SAVE_EXPRs. */ | |
2195 struct tlist_cache | |
2196 { | |
2197 struct tlist_cache *next; | |
2198 struct tlist *cache_before_sp; | |
2199 struct tlist *cache_after_sp; | |
2200 tree expr; | |
2201 }; | |
2202 | |
2203 /* Obstack to use when allocating tlist structures, and corresponding | |
2204 firstobj. */ | |
2205 static struct obstack tlist_obstack; | |
2206 static char *tlist_firstobj = 0; | |
2207 | |
2208 /* Keep track of the identifiers we've warned about, so we can avoid duplicate | |
2209 warnings. */ | |
2210 static struct tlist *warned_ids; | |
2211 /* SAVE_EXPRs need special treatment. We process them only once and then | |
2212 cache the results. */ | |
2213 static struct tlist_cache *save_expr_cache; | |
2214 | |
2215 static void add_tlist (struct tlist **, struct tlist *, tree, int); | |
2216 static void merge_tlist (struct tlist **, struct tlist *, int); | |
2217 static void verify_tree (tree, struct tlist **, struct tlist **, tree); | |
2218 static int warning_candidate_p (tree); | |
2219 static bool candidate_equal_p (const_tree, const_tree); | |
2220 static void warn_for_collisions (struct tlist *); | |
2221 static void warn_for_collisions_1 (tree, tree, struct tlist *, int); | |
2222 static struct tlist *new_tlist (struct tlist *, tree, tree); | |
2223 | |
2224 /* Create a new struct tlist and fill in its fields. */ | |
2225 static struct tlist * | |
2226 new_tlist (struct tlist *next, tree t, tree writer) | |
2227 { | |
2228 struct tlist *l; | |
2229 l = XOBNEW (&tlist_obstack, struct tlist); | |
2230 l->next = next; | |
2231 l->expr = t; | |
2232 l->writer = writer; | |
2233 return l; | |
2234 } | |
2235 | |
2236 /* Add duplicates of the nodes found in ADD to the list *TO. If EXCLUDE_WRITER | |
2237 is nonnull, we ignore any node we find which has a writer equal to it. */ | |
2238 | |
2239 static void | |
2240 add_tlist (struct tlist **to, struct tlist *add, tree exclude_writer, int copy) | |
2241 { | |
2242 while (add) | |
2243 { | |
2244 struct tlist *next = add->next; | |
2245 if (!copy) | |
2246 add->next = *to; | |
2247 if (!exclude_writer || !candidate_equal_p (add->writer, exclude_writer)) | |
2248 *to = copy ? new_tlist (*to, add->expr, add->writer) : add; | |
2249 add = next; | |
2250 } | |
2251 } | |
2252 | |
2253 /* Merge the nodes of ADD into TO. This merging process is done so that for | |
2254 each variable that already exists in TO, no new node is added; however if | |
2255 there is a write access recorded in ADD, and an occurrence on TO is only | |
2256 a read access, then the occurrence in TO will be modified to record the | |
2257 write. */ | |
2258 | |
2259 static void | |
2260 merge_tlist (struct tlist **to, struct tlist *add, int copy) | |
2261 { | |
2262 struct tlist **end = to; | |
2263 | |
2264 while (*end) | |
2265 end = &(*end)->next; | |
2266 | |
2267 while (add) | |
2268 { | |
2269 int found = 0; | |
2270 struct tlist *tmp2; | |
2271 struct tlist *next = add->next; | |
2272 | |
2273 for (tmp2 = *to; tmp2; tmp2 = tmp2->next) | |
2274 if (candidate_equal_p (tmp2->expr, add->expr)) | |
2275 { | |
2276 found = 1; | |
2277 if (!tmp2->writer) | |
2278 tmp2->writer = add->writer; | |
2279 } | |
2280 if (!found) | |
2281 { | |
2282 *end = copy ? add : new_tlist (NULL, add->expr, add->writer); | |
2283 end = &(*end)->next; | |
2284 *end = 0; | |
2285 } | |
2286 add = next; | |
2287 } | |
2288 } | |
2289 | |
2290 /* WRITTEN is a variable, WRITER is its parent. Warn if any of the variable | |
2291 references in list LIST conflict with it, excluding reads if ONLY writers | |
2292 is nonzero. */ | |
2293 | |
2294 static void | |
2295 warn_for_collisions_1 (tree written, tree writer, struct tlist *list, | |
2296 int only_writes) | |
2297 { | |
2298 struct tlist *tmp; | |
2299 | |
2300 /* Avoid duplicate warnings. */ | |
2301 for (tmp = warned_ids; tmp; tmp = tmp->next) | |
2302 if (candidate_equal_p (tmp->expr, written)) | |
2303 return; | |
2304 | |
2305 while (list) | |
2306 { | |
2307 if (candidate_equal_p (list->expr, written) | |
2308 && !candidate_equal_p (list->writer, writer) | |
2309 && (!only_writes || list->writer)) | |
2310 { | |
2311 warned_ids = new_tlist (warned_ids, written, NULL_TREE); | |
2312 warning_at (EXPR_LOC_OR_HERE (writer), | |
2313 OPT_Wsequence_point, "operation on %qE may be undefined", | |
2314 list->expr); | |
2315 } | |
2316 list = list->next; | |
2317 } | |
2318 } | |
2319 | |
2320 /* Given a list LIST of references to variables, find whether any of these | |
2321 can cause conflicts due to missing sequence points. */ | |
2322 | |
2323 static void | |
2324 warn_for_collisions (struct tlist *list) | |
2325 { | |
2326 struct tlist *tmp; | |
2327 | |
2328 for (tmp = list; tmp; tmp = tmp->next) | |
2329 { | |
2330 if (tmp->writer) | |
2331 warn_for_collisions_1 (tmp->expr, tmp->writer, list, 0); | |
2332 } | |
2333 } | |
2334 | |
2335 /* Return nonzero if X is a tree that can be verified by the sequence point | |
2336 warnings. */ | |
2337 static int | |
2338 warning_candidate_p (tree x) | |
2339 { | |
2340 if (DECL_P (x) && DECL_ARTIFICIAL (x)) | |
2341 return 0; | |
2342 | |
2343 /* VOID_TYPE_P (TREE_TYPE (x)) is workaround for cp/tree.c | |
2344 (lvalue_p) crash on TRY/CATCH. */ | |
2345 if (TREE_TYPE (x) == NULL_TREE || VOID_TYPE_P (TREE_TYPE (x))) | |
2346 return 0; | |
2347 | |
2348 if (!lvalue_p (x)) | |
2349 return 0; | |
2350 | |
2351 /* No point to track non-const calls, they will never satisfy | |
2352 operand_equal_p. */ | |
2353 if (TREE_CODE (x) == CALL_EXPR && (call_expr_flags (x) & ECF_CONST) == 0) | |
2354 return 0; | |
2355 | |
2356 if (TREE_CODE (x) == STRING_CST) | |
2357 return 0; | |
2358 | |
2359 return 1; | |
2360 } | |
2361 | |
2362 /* Return nonzero if X and Y appear to be the same candidate (or NULL) */ | |
2363 static bool | |
2364 candidate_equal_p (const_tree x, const_tree y) | |
2365 { | |
2366 return (x == y) || (x && y && operand_equal_p (x, y, 0)); | |
2367 } | |
2368 | |
2369 /* Walk the tree X, and record accesses to variables. If X is written by the | |
2370 parent tree, WRITER is the parent. | |
2371 We store accesses in one of the two lists: PBEFORE_SP, and PNO_SP. If this | |
2372 expression or its only operand forces a sequence point, then everything up | |
2373 to the sequence point is stored in PBEFORE_SP. Everything else gets stored | |
2374 in PNO_SP. | |
2375 Once we return, we will have emitted warnings if any subexpression before | |
2376 such a sequence point could be undefined. On a higher level, however, the | |
2377 sequence point may not be relevant, and we'll merge the two lists. | |
2378 | |
2379 Example: (b++, a) + b; | |
2380 The call that processes the COMPOUND_EXPR will store the increment of B | |
2381 in PBEFORE_SP, and the use of A in PNO_SP. The higher-level call that | |
2382 processes the PLUS_EXPR will need to merge the two lists so that | |
2383 eventually, all accesses end up on the same list (and we'll warn about the | |
2384 unordered subexpressions b++ and b. | |
2385 | |
2386 A note on merging. If we modify the former example so that our expression | |
2387 becomes | |
2388 (b++, b) + a | |
2389 care must be taken not simply to add all three expressions into the final | |
2390 PNO_SP list. The function merge_tlist takes care of that by merging the | |
2391 before-SP list of the COMPOUND_EXPR into its after-SP list in a special | |
2392 way, so that no more than one access to B is recorded. */ | |
2393 | |
2394 static void | |
2395 verify_tree (tree x, struct tlist **pbefore_sp, struct tlist **pno_sp, | |
2396 tree writer) | |
2397 { | |
2398 struct tlist *tmp_before, *tmp_nosp, *tmp_list2, *tmp_list3; | |
2399 enum tree_code code; | |
2400 enum tree_code_class cl; | |
2401 | |
2402 /* X may be NULL if it is the operand of an empty statement expression | |
2403 ({ }). */ | |
2404 if (x == NULL) | |
2405 return; | |
2406 | |
2407 restart: | |
2408 code = TREE_CODE (x); | |
2409 cl = TREE_CODE_CLASS (code); | |
2410 | |
2411 if (warning_candidate_p (x)) | |
2412 *pno_sp = new_tlist (*pno_sp, x, writer); | |
2413 | |
2414 switch (code) | |
2415 { | |
2416 case CONSTRUCTOR: | |
2417 return; | |
2418 | |
2419 case COMPOUND_EXPR: | |
2420 case TRUTH_ANDIF_EXPR: | |
2421 case TRUTH_ORIF_EXPR: | |
2422 tmp_before = tmp_nosp = tmp_list3 = 0; | |
2423 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
2424 warn_for_collisions (tmp_nosp); | |
2425 merge_tlist (pbefore_sp, tmp_before, 0); | |
2426 merge_tlist (pbefore_sp, tmp_nosp, 0); | |
2427 verify_tree (TREE_OPERAND (x, 1), &tmp_list3, pno_sp, NULL_TREE); | |
2428 merge_tlist (pbefore_sp, tmp_list3, 0); | |
2429 return; | |
2430 | |
2431 case COND_EXPR: | |
2432 tmp_before = tmp_list2 = 0; | |
2433 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_list2, NULL_TREE); | |
2434 warn_for_collisions (tmp_list2); | |
2435 merge_tlist (pbefore_sp, tmp_before, 0); | |
2436 merge_tlist (pbefore_sp, tmp_list2, 1); | |
2437 | |
2438 tmp_list3 = tmp_nosp = 0; | |
2439 verify_tree (TREE_OPERAND (x, 1), &tmp_list3, &tmp_nosp, NULL_TREE); | |
2440 warn_for_collisions (tmp_nosp); | |
2441 merge_tlist (pbefore_sp, tmp_list3, 0); | |
2442 | |
2443 tmp_list3 = tmp_list2 = 0; | |
2444 verify_tree (TREE_OPERAND (x, 2), &tmp_list3, &tmp_list2, NULL_TREE); | |
2445 warn_for_collisions (tmp_list2); | |
2446 merge_tlist (pbefore_sp, tmp_list3, 0); | |
2447 /* Rather than add both tmp_nosp and tmp_list2, we have to merge the | |
2448 two first, to avoid warning for (a ? b++ : b++). */ | |
2449 merge_tlist (&tmp_nosp, tmp_list2, 0); | |
2450 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
2451 return; | |
2452 | |
2453 case PREDECREMENT_EXPR: | |
2454 case PREINCREMENT_EXPR: | |
2455 case POSTDECREMENT_EXPR: | |
2456 case POSTINCREMENT_EXPR: | |
2457 verify_tree (TREE_OPERAND (x, 0), pno_sp, pno_sp, x); | |
2458 return; | |
2459 | |
2460 case MODIFY_EXPR: | |
2461 tmp_before = tmp_nosp = tmp_list3 = 0; | |
2462 verify_tree (TREE_OPERAND (x, 1), &tmp_before, &tmp_nosp, NULL_TREE); | |
2463 verify_tree (TREE_OPERAND (x, 0), &tmp_list3, &tmp_list3, x); | |
2464 /* Expressions inside the LHS are not ordered wrt. the sequence points | |
2465 in the RHS. Example: | |
2466 *a = (a++, 2) | |
2467 Despite the fact that the modification of "a" is in the before_sp | |
2468 list (tmp_before), it conflicts with the use of "a" in the LHS. | |
2469 We can handle this by adding the contents of tmp_list3 | |
2470 to those of tmp_before, and redoing the collision warnings for that | |
2471 list. */ | |
2472 add_tlist (&tmp_before, tmp_list3, x, 1); | |
2473 warn_for_collisions (tmp_before); | |
2474 /* Exclude the LHS itself here; we first have to merge it into the | |
2475 tmp_nosp list. This is done to avoid warning for "a = a"; if we | |
2476 didn't exclude the LHS, we'd get it twice, once as a read and once | |
2477 as a write. */ | |
2478 add_tlist (pno_sp, tmp_list3, x, 0); | |
2479 warn_for_collisions_1 (TREE_OPERAND (x, 0), x, tmp_nosp, 1); | |
2480 | |
2481 merge_tlist (pbefore_sp, tmp_before, 0); | |
2482 if (warning_candidate_p (TREE_OPERAND (x, 0))) | |
2483 merge_tlist (&tmp_nosp, new_tlist (NULL, TREE_OPERAND (x, 0), x), 0); | |
2484 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 1); | |
2485 return; | |
2486 | |
2487 case CALL_EXPR: | |
2488 /* We need to warn about conflicts among arguments and conflicts between | |
2489 args and the function address. Side effects of the function address, | |
2490 however, are not ordered by the sequence point of the call. */ | |
2491 { | |
2492 call_expr_arg_iterator iter; | |
2493 tree arg; | |
2494 tmp_before = tmp_nosp = 0; | |
2495 verify_tree (CALL_EXPR_FN (x), &tmp_before, &tmp_nosp, NULL_TREE); | |
2496 FOR_EACH_CALL_EXPR_ARG (arg, iter, x) | |
2497 { | |
2498 tmp_list2 = tmp_list3 = 0; | |
2499 verify_tree (arg, &tmp_list2, &tmp_list3, NULL_TREE); | |
2500 merge_tlist (&tmp_list3, tmp_list2, 0); | |
2501 add_tlist (&tmp_before, tmp_list3, NULL_TREE, 0); | |
2502 } | |
2503 add_tlist (&tmp_before, tmp_nosp, NULL_TREE, 0); | |
2504 warn_for_collisions (tmp_before); | |
2505 add_tlist (pbefore_sp, tmp_before, NULL_TREE, 0); | |
2506 return; | |
2507 } | |
2508 | |
2509 case TREE_LIST: | |
2510 /* Scan all the list, e.g. indices of multi dimensional array. */ | |
2511 while (x) | |
2512 { | |
2513 tmp_before = tmp_nosp = 0; | |
2514 verify_tree (TREE_VALUE (x), &tmp_before, &tmp_nosp, NULL_TREE); | |
2515 merge_tlist (&tmp_nosp, tmp_before, 0); | |
2516 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
2517 x = TREE_CHAIN (x); | |
2518 } | |
2519 return; | |
2520 | |
2521 case SAVE_EXPR: | |
2522 { | |
2523 struct tlist_cache *t; | |
2524 for (t = save_expr_cache; t; t = t->next) | |
2525 if (candidate_equal_p (t->expr, x)) | |
2526 break; | |
2527 | |
2528 if (!t) | |
2529 { | |
2530 t = XOBNEW (&tlist_obstack, struct tlist_cache); | |
2531 t->next = save_expr_cache; | |
2532 t->expr = x; | |
2533 save_expr_cache = t; | |
2534 | |
2535 tmp_before = tmp_nosp = 0; | |
2536 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE); | |
2537 warn_for_collisions (tmp_nosp); | |
2538 | |
2539 tmp_list3 = 0; | |
2540 while (tmp_nosp) | |
2541 { | |
2542 struct tlist *t = tmp_nosp; | |
2543 tmp_nosp = t->next; | |
2544 merge_tlist (&tmp_list3, t, 0); | |
2545 } | |
2546 t->cache_before_sp = tmp_before; | |
2547 t->cache_after_sp = tmp_list3; | |
2548 } | |
2549 merge_tlist (pbefore_sp, t->cache_before_sp, 1); | |
2550 add_tlist (pno_sp, t->cache_after_sp, NULL_TREE, 1); | |
2551 return; | |
2552 } | |
2553 | |
2554 case ADDR_EXPR: | |
2555 x = TREE_OPERAND (x, 0); | |
2556 if (DECL_P (x)) | |
2557 return; | |
2558 writer = 0; | |
2559 goto restart; | |
2560 | |
2561 default: | |
2562 /* For other expressions, simply recurse on their operands. | |
2563 Manual tail recursion for unary expressions. | |
2564 Other non-expressions need not be processed. */ | |
2565 if (cl == tcc_unary) | |
2566 { | |
2567 x = TREE_OPERAND (x, 0); | |
2568 writer = 0; | |
2569 goto restart; | |
2570 } | |
2571 else if (IS_EXPR_CODE_CLASS (cl)) | |
2572 { | |
2573 int lp; | |
2574 int max = TREE_OPERAND_LENGTH (x); | |
2575 for (lp = 0; lp < max; lp++) | |
2576 { | |
2577 tmp_before = tmp_nosp = 0; | |
2578 verify_tree (TREE_OPERAND (x, lp), &tmp_before, &tmp_nosp, 0); | |
2579 merge_tlist (&tmp_nosp, tmp_before, 0); | |
2580 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0); | |
2581 } | |
2582 } | |
2583 return; | |
2584 } | |
2585 } | |
2586 | |
2587 /* Try to warn for undefined behavior in EXPR due to missing sequence | |
2588 points. */ | |
2589 | |
2590 DEBUG_FUNCTION void | |
2591 verify_sequence_points (tree expr) | |
2592 { | |
2593 struct tlist *before_sp = 0, *after_sp = 0; | |
2594 | |
2595 warned_ids = 0; | |
2596 save_expr_cache = 0; | |
2597 if (tlist_firstobj == 0) | |
2598 { | |
2599 gcc_obstack_init (&tlist_obstack); | |
2600 tlist_firstobj = (char *) obstack_alloc (&tlist_obstack, 0); | |
2601 } | |
2602 | |
2603 verify_tree (expr, &before_sp, &after_sp, 0); | |
2604 warn_for_collisions (after_sp); | |
2605 obstack_free (&tlist_obstack, tlist_firstobj); | |
2606 } | |
2607 | |
2608 /* Validate the expression after `case' and apply default promotions. */ | |
2609 | |
2610 static tree | |
2611 check_case_value (tree value) | |
2612 { | |
2613 if (value == NULL_TREE) | |
2614 return value; | |
2615 | |
2616 if (TREE_CODE (value) == INTEGER_CST) | |
2617 /* Promote char or short to int. */ | |
2618 value = perform_integral_promotions (value); | |
2619 else if (value != error_mark_node) | |
2620 { | |
2621 error ("case label does not reduce to an integer constant"); | |
2622 value = error_mark_node; | |
2623 } | |
2624 | |
2625 constant_expression_warning (value); | |
2626 | |
2627 return value; | |
2628 } | |
2629 | |
2630 /* See if the case values LOW and HIGH are in the range of the original | |
2631 type (i.e. before the default conversion to int) of the switch testing | |
2632 expression. | |
2633 TYPE is the promoted type of the testing expression, and ORIG_TYPE is | |
2634 the type before promoting it. CASE_LOW_P is a pointer to the lower | |
2635 bound of the case label, and CASE_HIGH_P is the upper bound or NULL | |
2636 if the case is not a case range. | |
2637 The caller has to make sure that we are not called with NULL for | |
2638 CASE_LOW_P (i.e. the default case). | |
2639 Returns true if the case label is in range of ORIG_TYPE (saturated or | |
2640 untouched) or false if the label is out of range. */ | |
2641 | |
2642 static bool | |
2643 check_case_bounds (tree type, tree orig_type, | |
2644 tree *case_low_p, tree *case_high_p) | |
2645 { | |
2646 tree min_value, max_value; | |
2647 tree case_low = *case_low_p; | |
2648 tree case_high = case_high_p ? *case_high_p : case_low; | |
2649 | |
2650 /* If there was a problem with the original type, do nothing. */ | |
2651 if (orig_type == error_mark_node) | |
2652 return true; | |
2653 | |
2654 min_value = TYPE_MIN_VALUE (orig_type); | |
2655 max_value = TYPE_MAX_VALUE (orig_type); | |
2656 | |
2657 /* Case label is less than minimum for type. */ | |
2658 if (tree_int_cst_compare (case_low, min_value) < 0 | |
2659 && tree_int_cst_compare (case_high, min_value) < 0) | |
2660 { | |
2661 warning (0, "case label value is less than minimum value for type"); | |
2662 return false; | |
2663 } | |
2664 | |
2665 /* Case value is greater than maximum for type. */ | |
2666 if (tree_int_cst_compare (case_low, max_value) > 0 | |
2667 && tree_int_cst_compare (case_high, max_value) > 0) | |
2668 { | |
2669 warning (0, "case label value exceeds maximum value for type"); | |
2670 return false; | |
2671 } | |
2672 | |
2673 /* Saturate lower case label value to minimum. */ | |
2674 if (tree_int_cst_compare (case_high, min_value) >= 0 | |
2675 && tree_int_cst_compare (case_low, min_value) < 0) | |
2676 { | |
2677 warning (0, "lower value in case label range" | |
2678 " less than minimum value for type"); | |
2679 case_low = min_value; | |
2680 } | |
2681 | |
2682 /* Saturate upper case label value to maximum. */ | |
2683 if (tree_int_cst_compare (case_low, max_value) <= 0 | |
2684 && tree_int_cst_compare (case_high, max_value) > 0) | |
2685 { | |
2686 warning (0, "upper value in case label range" | |
2687 " exceeds maximum value for type"); | |
2688 case_high = max_value; | |
2689 } | |
2690 | |
2691 if (*case_low_p != case_low) | |
2692 *case_low_p = convert (type, case_low); | |
2693 if (case_high_p && *case_high_p != case_high) | |
2694 *case_high_p = convert (type, case_high); | |
2695 | |
2696 return true; | |
2697 } | |
2698 | |
2699 /* Return an integer type with BITS bits of precision, | |
2700 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */ | |
2701 | |
2702 tree | |
2703 c_common_type_for_size (unsigned int bits, int unsignedp) | |
2704 { | |
2705 if (bits == TYPE_PRECISION (integer_type_node)) | |
2706 return unsignedp ? unsigned_type_node : integer_type_node; | |
2707 | |
2708 if (bits == TYPE_PRECISION (signed_char_type_node)) | |
2709 return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
2710 | |
2711 if (bits == TYPE_PRECISION (short_integer_type_node)) | |
2712 return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
2713 | |
2714 if (bits == TYPE_PRECISION (long_integer_type_node)) | |
2715 return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
2716 | |
2717 if (bits == TYPE_PRECISION (long_long_integer_type_node)) | |
2718 return (unsignedp ? long_long_unsigned_type_node | |
2719 : long_long_integer_type_node); | |
2720 | |
2721 if (int128_integer_type_node | |
2722 && bits == TYPE_PRECISION (int128_integer_type_node)) | |
2723 return (unsignedp ? int128_unsigned_type_node | |
2724 : int128_integer_type_node); | |
2725 | |
2726 if (bits == TYPE_PRECISION (widest_integer_literal_type_node)) | |
2727 return (unsignedp ? widest_unsigned_literal_type_node | |
2728 : widest_integer_literal_type_node); | |
2729 | |
2730 if (bits <= TYPE_PRECISION (intQI_type_node)) | |
2731 return unsignedp ? unsigned_intQI_type_node : intQI_type_node; | |
2732 | |
2733 if (bits <= TYPE_PRECISION (intHI_type_node)) | |
2734 return unsignedp ? unsigned_intHI_type_node : intHI_type_node; | |
2735 | |
2736 if (bits <= TYPE_PRECISION (intSI_type_node)) | |
2737 return unsignedp ? unsigned_intSI_type_node : intSI_type_node; | |
2738 | |
2739 if (bits <= TYPE_PRECISION (intDI_type_node)) | |
2740 return unsignedp ? unsigned_intDI_type_node : intDI_type_node; | |
2741 | |
2742 return 0; | |
2743 } | |
2744 | |
2745 /* Return a fixed-point type that has at least IBIT ibits and FBIT fbits | |
2746 that is unsigned if UNSIGNEDP is nonzero, otherwise signed; | |
2747 and saturating if SATP is nonzero, otherwise not saturating. */ | |
2748 | |
2749 tree | |
2750 c_common_fixed_point_type_for_size (unsigned int ibit, unsigned int fbit, | |
2751 int unsignedp, int satp) | |
2752 { | |
2753 enum machine_mode mode; | |
2754 if (ibit == 0) | |
2755 mode = unsignedp ? UQQmode : QQmode; | |
2756 else | |
2757 mode = unsignedp ? UHAmode : HAmode; | |
2758 | |
2759 for (; mode != VOIDmode; mode = GET_MODE_WIDER_MODE (mode)) | |
2760 if (GET_MODE_IBIT (mode) >= ibit && GET_MODE_FBIT (mode) >= fbit) | |
2761 break; | |
2762 | |
2763 if (mode == VOIDmode || !targetm.scalar_mode_supported_p (mode)) | |
2764 { | |
2765 sorry ("GCC cannot support operators with integer types and " | |
2766 "fixed-point types that have too many integral and " | |
2767 "fractional bits together"); | |
2768 return 0; | |
2769 } | |
2770 | |
2771 return c_common_type_for_mode (mode, satp); | |
2772 } | |
2773 | |
2774 /* Used for communication between c_common_type_for_mode and | |
2775 c_register_builtin_type. */ | |
2776 static GTY(()) tree registered_builtin_types; | |
2777 | |
2778 /* Return a data type that has machine mode MODE. | |
2779 If the mode is an integer, | |
2780 then UNSIGNEDP selects between signed and unsigned types. | |
2781 If the mode is a fixed-point mode, | |
2782 then UNSIGNEDP selects between saturating and nonsaturating types. */ | |
2783 | |
2784 tree | |
2785 c_common_type_for_mode (enum machine_mode mode, int unsignedp) | |
2786 { | |
2787 tree t; | |
2788 | |
2789 if (mode == TYPE_MODE (integer_type_node)) | |
2790 return unsignedp ? unsigned_type_node : integer_type_node; | |
2791 | |
2792 if (mode == TYPE_MODE (signed_char_type_node)) | |
2793 return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
2794 | |
2795 if (mode == TYPE_MODE (short_integer_type_node)) | |
2796 return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
2797 | |
2798 if (mode == TYPE_MODE (long_integer_type_node)) | |
2799 return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
2800 | |
2801 if (mode == TYPE_MODE (long_long_integer_type_node)) | |
2802 return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node; | |
2803 | |
2804 if (int128_integer_type_node | |
2805 && mode == TYPE_MODE (int128_integer_type_node)) | |
2806 return unsignedp ? int128_unsigned_type_node : int128_integer_type_node; | |
2807 | |
2808 if (mode == TYPE_MODE (widest_integer_literal_type_node)) | |
2809 return unsignedp ? widest_unsigned_literal_type_node | |
2810 : widest_integer_literal_type_node; | |
2811 | |
2812 if (mode == QImode) | |
2813 return unsignedp ? unsigned_intQI_type_node : intQI_type_node; | |
2814 | |
2815 if (mode == HImode) | |
2816 return unsignedp ? unsigned_intHI_type_node : intHI_type_node; | |
2817 | |
2818 if (mode == SImode) | |
2819 return unsignedp ? unsigned_intSI_type_node : intSI_type_node; | |
2820 | |
2821 if (mode == DImode) | |
2822 return unsignedp ? unsigned_intDI_type_node : intDI_type_node; | |
2823 | |
2824 #if HOST_BITS_PER_WIDE_INT >= 64 | |
2825 if (mode == TYPE_MODE (intTI_type_node)) | |
2826 return unsignedp ? unsigned_intTI_type_node : intTI_type_node; | |
2827 #endif | |
2828 | |
2829 if (mode == TYPE_MODE (float_type_node)) | |
2830 return float_type_node; | |
2831 | |
2832 if (mode == TYPE_MODE (double_type_node)) | |
2833 return double_type_node; | |
2834 | |
2835 if (mode == TYPE_MODE (long_double_type_node)) | |
2836 return long_double_type_node; | |
2837 | |
2838 if (mode == TYPE_MODE (void_type_node)) | |
2839 return void_type_node; | |
2840 | |
2841 if (mode == TYPE_MODE (build_pointer_type (char_type_node))) | |
2842 return (unsignedp | |
2843 ? make_unsigned_type (GET_MODE_PRECISION (mode)) | |
2844 : make_signed_type (GET_MODE_PRECISION (mode))); | |
2845 | |
2846 if (mode == TYPE_MODE (build_pointer_type (integer_type_node))) | |
2847 return (unsignedp | |
2848 ? make_unsigned_type (GET_MODE_PRECISION (mode)) | |
2849 : make_signed_type (GET_MODE_PRECISION (mode))); | |
2850 | |
2851 if (COMPLEX_MODE_P (mode)) | |
2852 { | |
2853 enum machine_mode inner_mode; | |
2854 tree inner_type; | |
2855 | |
2856 if (mode == TYPE_MODE (complex_float_type_node)) | |
2857 return complex_float_type_node; | |
2858 if (mode == TYPE_MODE (complex_double_type_node)) | |
2859 return complex_double_type_node; | |
2860 if (mode == TYPE_MODE (complex_long_double_type_node)) | |
2861 return complex_long_double_type_node; | |
2862 | |
2863 if (mode == TYPE_MODE (complex_integer_type_node) && !unsignedp) | |
2864 return complex_integer_type_node; | |
2865 | |
2866 inner_mode = GET_MODE_INNER (mode); | |
2867 inner_type = c_common_type_for_mode (inner_mode, unsignedp); | |
2868 if (inner_type != NULL_TREE) | |
2869 return build_complex_type (inner_type); | |
2870 } | |
2871 else if (VECTOR_MODE_P (mode)) | |
2872 { | |
2873 enum machine_mode inner_mode = GET_MODE_INNER (mode); | |
2874 tree inner_type = c_common_type_for_mode (inner_mode, unsignedp); | |
2875 if (inner_type != NULL_TREE) | |
2876 return build_vector_type_for_mode (inner_type, mode); | |
2877 } | |
2878 | |
2879 if (mode == TYPE_MODE (dfloat32_type_node)) | |
2880 return dfloat32_type_node; | |
2881 if (mode == TYPE_MODE (dfloat64_type_node)) | |
2882 return dfloat64_type_node; | |
2883 if (mode == TYPE_MODE (dfloat128_type_node)) | |
2884 return dfloat128_type_node; | |
2885 | |
2886 if (ALL_SCALAR_FIXED_POINT_MODE_P (mode)) | |
2887 { | |
2888 if (mode == TYPE_MODE (short_fract_type_node)) | |
2889 return unsignedp ? sat_short_fract_type_node : short_fract_type_node; | |
2890 if (mode == TYPE_MODE (fract_type_node)) | |
2891 return unsignedp ? sat_fract_type_node : fract_type_node; | |
2892 if (mode == TYPE_MODE (long_fract_type_node)) | |
2893 return unsignedp ? sat_long_fract_type_node : long_fract_type_node; | |
2894 if (mode == TYPE_MODE (long_long_fract_type_node)) | |
2895 return unsignedp ? sat_long_long_fract_type_node | |
2896 : long_long_fract_type_node; | |
2897 | |
2898 if (mode == TYPE_MODE (unsigned_short_fract_type_node)) | |
2899 return unsignedp ? sat_unsigned_short_fract_type_node | |
2900 : unsigned_short_fract_type_node; | |
2901 if (mode == TYPE_MODE (unsigned_fract_type_node)) | |
2902 return unsignedp ? sat_unsigned_fract_type_node | |
2903 : unsigned_fract_type_node; | |
2904 if (mode == TYPE_MODE (unsigned_long_fract_type_node)) | |
2905 return unsignedp ? sat_unsigned_long_fract_type_node | |
2906 : unsigned_long_fract_type_node; | |
2907 if (mode == TYPE_MODE (unsigned_long_long_fract_type_node)) | |
2908 return unsignedp ? sat_unsigned_long_long_fract_type_node | |
2909 : unsigned_long_long_fract_type_node; | |
2910 | |
2911 if (mode == TYPE_MODE (short_accum_type_node)) | |
2912 return unsignedp ? sat_short_accum_type_node : short_accum_type_node; | |
2913 if (mode == TYPE_MODE (accum_type_node)) | |
2914 return unsignedp ? sat_accum_type_node : accum_type_node; | |
2915 if (mode == TYPE_MODE (long_accum_type_node)) | |
2916 return unsignedp ? sat_long_accum_type_node : long_accum_type_node; | |
2917 if (mode == TYPE_MODE (long_long_accum_type_node)) | |
2918 return unsignedp ? sat_long_long_accum_type_node | |
2919 : long_long_accum_type_node; | |
2920 | |
2921 if (mode == TYPE_MODE (unsigned_short_accum_type_node)) | |
2922 return unsignedp ? sat_unsigned_short_accum_type_node | |
2923 : unsigned_short_accum_type_node; | |
2924 if (mode == TYPE_MODE (unsigned_accum_type_node)) | |
2925 return unsignedp ? sat_unsigned_accum_type_node | |
2926 : unsigned_accum_type_node; | |
2927 if (mode == TYPE_MODE (unsigned_long_accum_type_node)) | |
2928 return unsignedp ? sat_unsigned_long_accum_type_node | |
2929 : unsigned_long_accum_type_node; | |
2930 if (mode == TYPE_MODE (unsigned_long_long_accum_type_node)) | |
2931 return unsignedp ? sat_unsigned_long_long_accum_type_node | |
2932 : unsigned_long_long_accum_type_node; | |
2933 | |
2934 if (mode == QQmode) | |
2935 return unsignedp ? sat_qq_type_node : qq_type_node; | |
2936 if (mode == HQmode) | |
2937 return unsignedp ? sat_hq_type_node : hq_type_node; | |
2938 if (mode == SQmode) | |
2939 return unsignedp ? sat_sq_type_node : sq_type_node; | |
2940 if (mode == DQmode) | |
2941 return unsignedp ? sat_dq_type_node : dq_type_node; | |
2942 if (mode == TQmode) | |
2943 return unsignedp ? sat_tq_type_node : tq_type_node; | |
2944 | |
2945 if (mode == UQQmode) | |
2946 return unsignedp ? sat_uqq_type_node : uqq_type_node; | |
2947 if (mode == UHQmode) | |
2948 return unsignedp ? sat_uhq_type_node : uhq_type_node; | |
2949 if (mode == USQmode) | |
2950 return unsignedp ? sat_usq_type_node : usq_type_node; | |
2951 if (mode == UDQmode) | |
2952 return unsignedp ? sat_udq_type_node : udq_type_node; | |
2953 if (mode == UTQmode) | |
2954 return unsignedp ? sat_utq_type_node : utq_type_node; | |
2955 | |
2956 if (mode == HAmode) | |
2957 return unsignedp ? sat_ha_type_node : ha_type_node; | |
2958 if (mode == SAmode) | |
2959 return unsignedp ? sat_sa_type_node : sa_type_node; | |
2960 if (mode == DAmode) | |
2961 return unsignedp ? sat_da_type_node : da_type_node; | |
2962 if (mode == TAmode) | |
2963 return unsignedp ? sat_ta_type_node : ta_type_node; | |
2964 | |
2965 if (mode == UHAmode) | |
2966 return unsignedp ? sat_uha_type_node : uha_type_node; | |
2967 if (mode == USAmode) | |
2968 return unsignedp ? sat_usa_type_node : usa_type_node; | |
2969 if (mode == UDAmode) | |
2970 return unsignedp ? sat_uda_type_node : uda_type_node; | |
2971 if (mode == UTAmode) | |
2972 return unsignedp ? sat_uta_type_node : uta_type_node; | |
2973 } | |
2974 | |
2975 for (t = registered_builtin_types; t; t = TREE_CHAIN (t)) | |
2976 if (TYPE_MODE (TREE_VALUE (t)) == mode) | |
2977 return TREE_VALUE (t); | |
2978 | |
2979 return 0; | |
2980 } | |
2981 | |
2982 tree | |
2983 c_common_unsigned_type (tree type) | |
2984 { | |
2985 return c_common_signed_or_unsigned_type (1, type); | |
2986 } | |
2987 | |
2988 /* Return a signed type the same as TYPE in other respects. */ | |
2989 | |
2990 tree | |
2991 c_common_signed_type (tree type) | |
2992 { | |
2993 return c_common_signed_or_unsigned_type (0, type); | |
2994 } | |
2995 | |
2996 /* Return a type the same as TYPE except unsigned or | |
2997 signed according to UNSIGNEDP. */ | |
2998 | |
2999 tree | |
3000 c_common_signed_or_unsigned_type (int unsignedp, tree type) | |
3001 { | |
3002 tree type1; | |
3003 | |
3004 /* This block of code emulates the behavior of the old | |
3005 c_common_unsigned_type. In particular, it returns | |
3006 long_unsigned_type_node if passed a long, even when a int would | |
3007 have the same size. This is necessary for warnings to work | |
3008 correctly in archs where sizeof(int) == sizeof(long) */ | |
3009 | |
3010 type1 = TYPE_MAIN_VARIANT (type); | |
3011 if (type1 == signed_char_type_node || type1 == char_type_node || type1 == unsigned_char_type_node) | |
3012 return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
3013 if (type1 == integer_type_node || type1 == unsigned_type_node) | |
3014 return unsignedp ? unsigned_type_node : integer_type_node; | |
3015 if (type1 == short_integer_type_node || type1 == short_unsigned_type_node) | |
3016 return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
3017 if (type1 == long_integer_type_node || type1 == long_unsigned_type_node) | |
3018 return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
3019 if (type1 == long_long_integer_type_node || type1 == long_long_unsigned_type_node) | |
3020 return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node; | |
3021 if (int128_integer_type_node | |
3022 && (type1 == int128_integer_type_node | |
3023 || type1 == int128_unsigned_type_node)) | |
3024 return unsignedp ? int128_unsigned_type_node : int128_integer_type_node; | |
3025 if (type1 == widest_integer_literal_type_node || type1 == widest_unsigned_literal_type_node) | |
3026 return unsignedp ? widest_unsigned_literal_type_node : widest_integer_literal_type_node; | |
3027 #if HOST_BITS_PER_WIDE_INT >= 64 | |
3028 if (type1 == intTI_type_node || type1 == unsigned_intTI_type_node) | |
3029 return unsignedp ? unsigned_intTI_type_node : intTI_type_node; | |
3030 #endif | |
3031 if (type1 == intDI_type_node || type1 == unsigned_intDI_type_node) | |
3032 return unsignedp ? unsigned_intDI_type_node : intDI_type_node; | |
3033 if (type1 == intSI_type_node || type1 == unsigned_intSI_type_node) | |
3034 return unsignedp ? unsigned_intSI_type_node : intSI_type_node; | |
3035 if (type1 == intHI_type_node || type1 == unsigned_intHI_type_node) | |
3036 return unsignedp ? unsigned_intHI_type_node : intHI_type_node; | |
3037 if (type1 == intQI_type_node || type1 == unsigned_intQI_type_node) | |
3038 return unsignedp ? unsigned_intQI_type_node : intQI_type_node; | |
3039 | |
3040 #define C_COMMON_FIXED_TYPES(NAME) \ | |
3041 if (type1 == short_ ## NAME ## _type_node \ | |
3042 || type1 == unsigned_short_ ## NAME ## _type_node) \ | |
3043 return unsignedp ? unsigned_short_ ## NAME ## _type_node \ | |
3044 : short_ ## NAME ## _type_node; \ | |
3045 if (type1 == NAME ## _type_node \ | |
3046 || type1 == unsigned_ ## NAME ## _type_node) \ | |
3047 return unsignedp ? unsigned_ ## NAME ## _type_node \ | |
3048 : NAME ## _type_node; \ | |
3049 if (type1 == long_ ## NAME ## _type_node \ | |
3050 || type1 == unsigned_long_ ## NAME ## _type_node) \ | |
3051 return unsignedp ? unsigned_long_ ## NAME ## _type_node \ | |
3052 : long_ ## NAME ## _type_node; \ | |
3053 if (type1 == long_long_ ## NAME ## _type_node \ | |
3054 || type1 == unsigned_long_long_ ## NAME ## _type_node) \ | |
3055 return unsignedp ? unsigned_long_long_ ## NAME ## _type_node \ | |
3056 : long_long_ ## NAME ## _type_node; | |
3057 | |
3058 #define C_COMMON_FIXED_MODE_TYPES(NAME) \ | |
3059 if (type1 == NAME ## _type_node \ | |
3060 || type1 == u ## NAME ## _type_node) \ | |
3061 return unsignedp ? u ## NAME ## _type_node \ | |
3062 : NAME ## _type_node; | |
3063 | |
3064 #define C_COMMON_FIXED_TYPES_SAT(NAME) \ | |
3065 if (type1 == sat_ ## short_ ## NAME ## _type_node \ | |
3066 || type1 == sat_ ## unsigned_short_ ## NAME ## _type_node) \ | |
3067 return unsignedp ? sat_ ## unsigned_short_ ## NAME ## _type_node \ | |
3068 : sat_ ## short_ ## NAME ## _type_node; \ | |
3069 if (type1 == sat_ ## NAME ## _type_node \ | |
3070 || type1 == sat_ ## unsigned_ ## NAME ## _type_node) \ | |
3071 return unsignedp ? sat_ ## unsigned_ ## NAME ## _type_node \ | |
3072 : sat_ ## NAME ## _type_node; \ | |
3073 if (type1 == sat_ ## long_ ## NAME ## _type_node \ | |
3074 || type1 == sat_ ## unsigned_long_ ## NAME ## _type_node) \ | |
3075 return unsignedp ? sat_ ## unsigned_long_ ## NAME ## _type_node \ | |
3076 : sat_ ## long_ ## NAME ## _type_node; \ | |
3077 if (type1 == sat_ ## long_long_ ## NAME ## _type_node \ | |
3078 || type1 == sat_ ## unsigned_long_long_ ## NAME ## _type_node) \ | |
3079 return unsignedp ? sat_ ## unsigned_long_long_ ## NAME ## _type_node \ | |
3080 : sat_ ## long_long_ ## NAME ## _type_node; | |
3081 | |
3082 #define C_COMMON_FIXED_MODE_TYPES_SAT(NAME) \ | |
3083 if (type1 == sat_ ## NAME ## _type_node \ | |
3084 || type1 == sat_ ## u ## NAME ## _type_node) \ | |
3085 return unsignedp ? sat_ ## u ## NAME ## _type_node \ | |
3086 : sat_ ## NAME ## _type_node; | |
3087 | |
3088 C_COMMON_FIXED_TYPES (fract); | |
3089 C_COMMON_FIXED_TYPES_SAT (fract); | |
3090 C_COMMON_FIXED_TYPES (accum); | |
3091 C_COMMON_FIXED_TYPES_SAT (accum); | |
3092 | |
3093 C_COMMON_FIXED_MODE_TYPES (qq); | |
3094 C_COMMON_FIXED_MODE_TYPES (hq); | |
3095 C_COMMON_FIXED_MODE_TYPES (sq); | |
3096 C_COMMON_FIXED_MODE_TYPES (dq); | |
3097 C_COMMON_FIXED_MODE_TYPES (tq); | |
3098 C_COMMON_FIXED_MODE_TYPES_SAT (qq); | |
3099 C_COMMON_FIXED_MODE_TYPES_SAT (hq); | |
3100 C_COMMON_FIXED_MODE_TYPES_SAT (sq); | |
3101 C_COMMON_FIXED_MODE_TYPES_SAT (dq); | |
3102 C_COMMON_FIXED_MODE_TYPES_SAT (tq); | |
3103 C_COMMON_FIXED_MODE_TYPES (ha); | |
3104 C_COMMON_FIXED_MODE_TYPES (sa); | |
3105 C_COMMON_FIXED_MODE_TYPES (da); | |
3106 C_COMMON_FIXED_MODE_TYPES (ta); | |
3107 C_COMMON_FIXED_MODE_TYPES_SAT (ha); | |
3108 C_COMMON_FIXED_MODE_TYPES_SAT (sa); | |
3109 C_COMMON_FIXED_MODE_TYPES_SAT (da); | |
3110 C_COMMON_FIXED_MODE_TYPES_SAT (ta); | |
3111 | |
3112 /* For ENUMERAL_TYPEs in C++, must check the mode of the types, not | |
3113 the precision; they have precision set to match their range, but | |
3114 may use a wider mode to match an ABI. If we change modes, we may | |
3115 wind up with bad conversions. For INTEGER_TYPEs in C, must check | |
3116 the precision as well, so as to yield correct results for | |
3117 bit-field types. C++ does not have these separate bit-field | |
3118 types, and producing a signed or unsigned variant of an | |
3119 ENUMERAL_TYPE may cause other problems as well. */ | |
3120 | |
3121 if (!INTEGRAL_TYPE_P (type) | |
3122 || TYPE_UNSIGNED (type) == unsignedp) | |
3123 return type; | |
3124 | |
3125 #define TYPE_OK(node) \ | |
3126 (TYPE_MODE (type) == TYPE_MODE (node) \ | |
3127 && TYPE_PRECISION (type) == TYPE_PRECISION (node)) | |
3128 if (TYPE_OK (signed_char_type_node)) | |
3129 return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
3130 if (TYPE_OK (integer_type_node)) | |
3131 return unsignedp ? unsigned_type_node : integer_type_node; | |
3132 if (TYPE_OK (short_integer_type_node)) | |
3133 return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
3134 if (TYPE_OK (long_integer_type_node)) | |
3135 return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
3136 if (TYPE_OK (long_long_integer_type_node)) | |
3137 return (unsignedp ? long_long_unsigned_type_node | |
3138 : long_long_integer_type_node); | |
3139 if (int128_integer_type_node && TYPE_OK (int128_integer_type_node)) | |
3140 return (unsignedp ? int128_unsigned_type_node | |
3141 : int128_integer_type_node); | |
3142 if (TYPE_OK (widest_integer_literal_type_node)) | |
3143 return (unsignedp ? widest_unsigned_literal_type_node | |
3144 : widest_integer_literal_type_node); | |
3145 | |
3146 #if HOST_BITS_PER_WIDE_INT >= 64 | |
3147 if (TYPE_OK (intTI_type_node)) | |
3148 return unsignedp ? unsigned_intTI_type_node : intTI_type_node; | |
3149 #endif | |
3150 if (TYPE_OK (intDI_type_node)) | |
3151 return unsignedp ? unsigned_intDI_type_node : intDI_type_node; | |
3152 if (TYPE_OK (intSI_type_node)) | |
3153 return unsignedp ? unsigned_intSI_type_node : intSI_type_node; | |
3154 if (TYPE_OK (intHI_type_node)) | |
3155 return unsignedp ? unsigned_intHI_type_node : intHI_type_node; | |
3156 if (TYPE_OK (intQI_type_node)) | |
3157 return unsignedp ? unsigned_intQI_type_node : intQI_type_node; | |
3158 #undef TYPE_OK | |
3159 | |
3160 return build_nonstandard_integer_type (TYPE_PRECISION (type), unsignedp); | |
3161 } | |
3162 | |
3163 /* Build a bit-field integer type for the given WIDTH and UNSIGNEDP. */ | |
3164 | |
3165 tree | |
3166 c_build_bitfield_integer_type (unsigned HOST_WIDE_INT width, int unsignedp) | |
3167 { | |
3168 /* Extended integer types of the same width as a standard type have | |
3169 lesser rank, so those of the same width as int promote to int or | |
3170 unsigned int and are valid for printf formats expecting int or | |
3171 unsigned int. To avoid such special cases, avoid creating | |
3172 extended integer types for bit-fields if a standard integer type | |
3173 is available. */ | |
3174 if (width == TYPE_PRECISION (integer_type_node)) | |
3175 return unsignedp ? unsigned_type_node : integer_type_node; | |
3176 if (width == TYPE_PRECISION (signed_char_type_node)) | |
3177 return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
3178 if (width == TYPE_PRECISION (short_integer_type_node)) | |
3179 return unsignedp ? short_unsigned_type_node : short_integer_type_node; | |
3180 if (width == TYPE_PRECISION (long_integer_type_node)) | |
3181 return unsignedp ? long_unsigned_type_node : long_integer_type_node; | |
3182 if (width == TYPE_PRECISION (long_long_integer_type_node)) | |
3183 return (unsignedp ? long_long_unsigned_type_node | |
3184 : long_long_integer_type_node); | |
3185 if (int128_integer_type_node | |
3186 && width == TYPE_PRECISION (int128_integer_type_node)) | |
3187 return (unsignedp ? int128_unsigned_type_node | |
3188 : int128_integer_type_node); | |
3189 return build_nonstandard_integer_type (width, unsignedp); | |
3190 } | |
3191 | |
3192 /* The C version of the register_builtin_type langhook. */ | |
3193 | |
3194 void | |
3195 c_register_builtin_type (tree type, const char* name) | |
3196 { | |
3197 tree decl; | |
3198 | |
3199 decl = build_decl (UNKNOWN_LOCATION, | |
3200 TYPE_DECL, get_identifier (name), type); | |
3201 DECL_ARTIFICIAL (decl) = 1; | |
3202 if (!TYPE_NAME (type)) | |
3203 TYPE_NAME (type) = decl; | |
3204 pushdecl (decl); | |
3205 | |
3206 registered_builtin_types = tree_cons (0, type, registered_builtin_types); | |
3207 } | |
3208 | |
3209 /* Print an error message for invalid operands to arith operation | |
3210 CODE with TYPE0 for operand 0, and TYPE1 for operand 1. | |
3211 LOCATION is the location of the message. */ | |
3212 | |
3213 void | |
3214 binary_op_error (location_t location, enum tree_code code, | |
3215 tree type0, tree type1) | |
3216 { | |
3217 const char *opname; | |
3218 | |
3219 switch (code) | |
3220 { | |
3221 case PLUS_EXPR: | |
3222 opname = "+"; break; | |
3223 case MINUS_EXPR: | |
3224 opname = "-"; break; | |
3225 case MULT_EXPR: | |
3226 opname = "*"; break; | |
3227 case MAX_EXPR: | |
3228 opname = "max"; break; | |
3229 case MIN_EXPR: | |
3230 opname = "min"; break; | |
3231 case EQ_EXPR: | |
3232 opname = "=="; break; | |
3233 case NE_EXPR: | |
3234 opname = "!="; break; | |
3235 case LE_EXPR: | |
3236 opname = "<="; break; | |
3237 case GE_EXPR: | |
3238 opname = ">="; break; | |
3239 case LT_EXPR: | |
3240 opname = "<"; break; | |
3241 case GT_EXPR: | |
3242 opname = ">"; break; | |
3243 case LSHIFT_EXPR: | |
3244 opname = "<<"; break; | |
3245 case RSHIFT_EXPR: | |
3246 opname = ">>"; break; | |
3247 case TRUNC_MOD_EXPR: | |
3248 case FLOOR_MOD_EXPR: | |
3249 opname = "%"; break; | |
3250 case TRUNC_DIV_EXPR: | |
3251 case FLOOR_DIV_EXPR: | |
3252 opname = "/"; break; | |
3253 case BIT_AND_EXPR: | |
3254 opname = "&"; break; | |
3255 case BIT_IOR_EXPR: | |
3256 opname = "|"; break; | |
3257 case TRUTH_ANDIF_EXPR: | |
3258 opname = "&&"; break; | |
3259 case TRUTH_ORIF_EXPR: | |
3260 opname = "||"; break; | |
3261 case BIT_XOR_EXPR: | |
3262 opname = "^"; break; | |
3263 default: | |
3264 gcc_unreachable (); | |
3265 } | |
3266 error_at (location, | |
3267 "invalid operands to binary %s (have %qT and %qT)", opname, | |
3268 type0, type1); | |
3269 } | |
3270 | |
3271 /* Subroutine of build_binary_op, used for comparison operations. | |
3272 See if the operands have both been converted from subword integer types | |
3273 and, if so, perhaps change them both back to their original type. | |
3274 This function is also responsible for converting the two operands | |
3275 to the proper common type for comparison. | |
3276 | |
3277 The arguments of this function are all pointers to local variables | |
3278 of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1, | |
3279 RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE. | |
3280 | |
3281 If this function returns nonzero, it means that the comparison has | |
3282 a constant value. What this function returns is an expression for | |
3283 that value. */ | |
3284 | |
3285 tree | |
3286 shorten_compare (tree *op0_ptr, tree *op1_ptr, tree *restype_ptr, | |
3287 enum tree_code *rescode_ptr) | |
3288 { | |
3289 tree type; | |
3290 tree op0 = *op0_ptr; | |
3291 tree op1 = *op1_ptr; | |
3292 int unsignedp0, unsignedp1; | |
3293 int real1, real2; | |
3294 tree primop0, primop1; | |
3295 enum tree_code code = *rescode_ptr; | |
3296 | |
3297 /* Throw away any conversions to wider types | |
3298 already present in the operands. */ | |
3299 | |
3300 primop0 = get_narrower (op0, &unsignedp0); | |
3301 primop1 = get_narrower (op1, &unsignedp1); | |
3302 | |
3303 /* Handle the case that OP0 does not *contain* a conversion | |
3304 but it *requires* conversion to FINAL_TYPE. */ | |
3305 | |
3306 if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr) | |
3307 unsignedp0 = TYPE_UNSIGNED (TREE_TYPE (op0)); | |
3308 if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr) | |
3309 unsignedp1 = TYPE_UNSIGNED (TREE_TYPE (op1)); | |
3310 | |
3311 /* If one of the operands must be floated, we cannot optimize. */ | |
3312 real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE; | |
3313 real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE; | |
3314 | |
3315 /* If first arg is constant, swap the args (changing operation | |
3316 so value is preserved), for canonicalization. Don't do this if | |
3317 the second arg is 0. */ | |
3318 | |
3319 if (TREE_CONSTANT (primop0) | |
3320 && !integer_zerop (primop1) && !real_zerop (primop1) | |
3321 && !fixed_zerop (primop1)) | |
3322 { | |
3323 tree tem = primop0; | |
3324 int temi = unsignedp0; | |
3325 primop0 = primop1; | |
3326 primop1 = tem; | |
3327 tem = op0; | |
3328 op0 = op1; | |
3329 op1 = tem; | |
3330 *op0_ptr = op0; | |
3331 *op1_ptr = op1; | |
3332 unsignedp0 = unsignedp1; | |
3333 unsignedp1 = temi; | |
3334 temi = real1; | |
3335 real1 = real2; | |
3336 real2 = temi; | |
3337 | |
3338 switch (code) | |
3339 { | |
3340 case LT_EXPR: | |
3341 code = GT_EXPR; | |
3342 break; | |
3343 case GT_EXPR: | |
3344 code = LT_EXPR; | |
3345 break; | |
3346 case LE_EXPR: | |
3347 code = GE_EXPR; | |
3348 break; | |
3349 case GE_EXPR: | |
3350 code = LE_EXPR; | |
3351 break; | |
3352 default: | |
3353 break; | |
3354 } | |
3355 *rescode_ptr = code; | |
3356 } | |
3357 | |
3358 /* If comparing an integer against a constant more bits wide, | |
3359 maybe we can deduce a value of 1 or 0 independent of the data. | |
3360 Or else truncate the constant now | |
3361 rather than extend the variable at run time. | |
3362 | |
3363 This is only interesting if the constant is the wider arg. | |
3364 Also, it is not safe if the constant is unsigned and the | |
3365 variable arg is signed, since in this case the variable | |
3366 would be sign-extended and then regarded as unsigned. | |
3367 Our technique fails in this case because the lowest/highest | |
3368 possible unsigned results don't follow naturally from the | |
3369 lowest/highest possible values of the variable operand. | |
3370 For just EQ_EXPR and NE_EXPR there is another technique that | |
3371 could be used: see if the constant can be faithfully represented | |
3372 in the other operand's type, by truncating it and reextending it | |
3373 and see if that preserves the constant's value. */ | |
3374 | |
3375 if (!real1 && !real2 | |
3376 && TREE_CODE (TREE_TYPE (primop0)) != FIXED_POINT_TYPE | |
3377 && TREE_CODE (primop1) == INTEGER_CST | |
3378 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)) | |
3379 { | |
3380 int min_gt, max_gt, min_lt, max_lt; | |
3381 tree maxval, minval; | |
3382 /* 1 if comparison is nominally unsigned. */ | |
3383 int unsignedp = TYPE_UNSIGNED (*restype_ptr); | |
3384 tree val; | |
3385 | |
3386 type = c_common_signed_or_unsigned_type (unsignedp0, | |
3387 TREE_TYPE (primop0)); | |
3388 | |
3389 maxval = TYPE_MAX_VALUE (type); | |
3390 minval = TYPE_MIN_VALUE (type); | |
3391 | |
3392 if (unsignedp && !unsignedp0) | |
3393 *restype_ptr = c_common_signed_type (*restype_ptr); | |
3394 | |
3395 if (TREE_TYPE (primop1) != *restype_ptr) | |
3396 { | |
3397 /* Convert primop1 to target type, but do not introduce | |
3398 additional overflow. We know primop1 is an int_cst. */ | |
3399 primop1 = force_fit_type_double (*restype_ptr, | |
3400 tree_to_double_int (primop1), | |
3401 0, TREE_OVERFLOW (primop1)); | |
3402 } | |
3403 if (type != *restype_ptr) | |
3404 { | |
3405 minval = convert (*restype_ptr, minval); | |
3406 maxval = convert (*restype_ptr, maxval); | |
3407 } | |
3408 | |
3409 if (unsignedp && unsignedp0) | |
3410 { | |
3411 min_gt = INT_CST_LT_UNSIGNED (primop1, minval); | |
3412 max_gt = INT_CST_LT_UNSIGNED (primop1, maxval); | |
3413 min_lt = INT_CST_LT_UNSIGNED (minval, primop1); | |
3414 max_lt = INT_CST_LT_UNSIGNED (maxval, primop1); | |
3415 } | |
3416 else | |
3417 { | |
3418 min_gt = INT_CST_LT (primop1, minval); | |
3419 max_gt = INT_CST_LT (primop1, maxval); | |
3420 min_lt = INT_CST_LT (minval, primop1); | |
3421 max_lt = INT_CST_LT (maxval, primop1); | |
3422 } | |
3423 | |
3424 val = 0; | |
3425 /* This used to be a switch, but Genix compiler can't handle that. */ | |
3426 if (code == NE_EXPR) | |
3427 { | |
3428 if (max_lt || min_gt) | |
3429 val = truthvalue_true_node; | |
3430 } | |
3431 else if (code == EQ_EXPR) | |
3432 { | |
3433 if (max_lt || min_gt) | |
3434 val = truthvalue_false_node; | |
3435 } | |
3436 else if (code == LT_EXPR) | |
3437 { | |
3438 if (max_lt) | |
3439 val = truthvalue_true_node; | |
3440 if (!min_lt) | |
3441 val = truthvalue_false_node; | |
3442 } | |
3443 else if (code == GT_EXPR) | |
3444 { | |
3445 if (min_gt) | |
3446 val = truthvalue_true_node; | |
3447 if (!max_gt) | |
3448 val = truthvalue_false_node; | |
3449 } | |
3450 else if (code == LE_EXPR) | |
3451 { | |
3452 if (!max_gt) | |
3453 val = truthvalue_true_node; | |
3454 if (min_gt) | |
3455 val = truthvalue_false_node; | |
3456 } | |
3457 else if (code == GE_EXPR) | |
3458 { | |
3459 if (!min_lt) | |
3460 val = truthvalue_true_node; | |
3461 if (max_lt) | |
3462 val = truthvalue_false_node; | |
3463 } | |
3464 | |
3465 /* If primop0 was sign-extended and unsigned comparison specd, | |
3466 we did a signed comparison above using the signed type bounds. | |
3467 But the comparison we output must be unsigned. | |
3468 | |
3469 Also, for inequalities, VAL is no good; but if the signed | |
3470 comparison had *any* fixed result, it follows that the | |
3471 unsigned comparison just tests the sign in reverse | |
3472 (positive values are LE, negative ones GE). | |
3473 So we can generate an unsigned comparison | |
3474 against an extreme value of the signed type. */ | |
3475 | |
3476 if (unsignedp && !unsignedp0) | |
3477 { | |
3478 if (val != 0) | |
3479 switch (code) | |
3480 { | |
3481 case LT_EXPR: | |
3482 case GE_EXPR: | |
3483 primop1 = TYPE_MIN_VALUE (type); | |
3484 val = 0; | |
3485 break; | |
3486 | |
3487 case LE_EXPR: | |
3488 case GT_EXPR: | |
3489 primop1 = TYPE_MAX_VALUE (type); | |
3490 val = 0; | |
3491 break; | |
3492 | |
3493 default: | |
3494 break; | |
3495 } | |
3496 type = c_common_unsigned_type (type); | |
3497 } | |
3498 | |
3499 if (TREE_CODE (primop0) != INTEGER_CST) | |
3500 { | |
3501 if (val == truthvalue_false_node) | |
3502 warning (OPT_Wtype_limits, "comparison is always false due to limited range of data type"); | |
3503 if (val == truthvalue_true_node) | |
3504 warning (OPT_Wtype_limits, "comparison is always true due to limited range of data type"); | |
3505 } | |
3506 | |
3507 if (val != 0) | |
3508 { | |
3509 /* Don't forget to evaluate PRIMOP0 if it has side effects. */ | |
3510 if (TREE_SIDE_EFFECTS (primop0)) | |
3511 return build2 (COMPOUND_EXPR, TREE_TYPE (val), primop0, val); | |
3512 return val; | |
3513 } | |
3514 | |
3515 /* Value is not predetermined, but do the comparison | |
3516 in the type of the operand that is not constant. | |
3517 TYPE is already properly set. */ | |
3518 } | |
3519 | |
3520 /* If either arg is decimal float and the other is float, find the | |
3521 proper common type to use for comparison. */ | |
3522 else if (real1 && real2 | |
3523 && (DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (primop0))) | |
3524 || DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (primop1))))) | |
3525 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1)); | |
3526 | |
3527 else if (real1 && real2 | |
3528 && (TYPE_PRECISION (TREE_TYPE (primop0)) | |
3529 == TYPE_PRECISION (TREE_TYPE (primop1)))) | |
3530 type = TREE_TYPE (primop0); | |
3531 | |
3532 /* If args' natural types are both narrower than nominal type | |
3533 and both extend in the same manner, compare them | |
3534 in the type of the wider arg. | |
3535 Otherwise must actually extend both to the nominal | |
3536 common type lest different ways of extending | |
3537 alter the result. | |
3538 (eg, (short)-1 == (unsigned short)-1 should be 0.) */ | |
3539 | |
3540 else if (unsignedp0 == unsignedp1 && real1 == real2 | |
3541 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr) | |
3542 && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr)) | |
3543 { | |
3544 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1)); | |
3545 type = c_common_signed_or_unsigned_type (unsignedp0 | |
3546 || TYPE_UNSIGNED (*restype_ptr), | |
3547 type); | |
3548 /* Make sure shorter operand is extended the right way | |
3549 to match the longer operand. */ | |
3550 primop0 | |
3551 = convert (c_common_signed_or_unsigned_type (unsignedp0, | |
3552 TREE_TYPE (primop0)), | |
3553 primop0); | |
3554 primop1 | |
3555 = convert (c_common_signed_or_unsigned_type (unsignedp1, | |
3556 TREE_TYPE (primop1)), | |
3557 primop1); | |
3558 } | |
3559 else | |
3560 { | |
3561 /* Here we must do the comparison on the nominal type | |
3562 using the args exactly as we received them. */ | |
3563 type = *restype_ptr; | |
3564 primop0 = op0; | |
3565 primop1 = op1; | |
3566 | |
3567 if (!real1 && !real2 && integer_zerop (primop1) | |
3568 && TYPE_UNSIGNED (*restype_ptr)) | |
3569 { | |
3570 tree value = 0; | |
3571 switch (code) | |
3572 { | |
3573 case GE_EXPR: | |
3574 /* All unsigned values are >= 0, so we warn. However, | |
3575 if OP0 is a constant that is >= 0, the signedness of | |
3576 the comparison isn't an issue, so suppress the | |
3577 warning. */ | |
3578 if (warn_type_limits && !in_system_header | |
3579 && !(TREE_CODE (primop0) == INTEGER_CST | |
3580 && !TREE_OVERFLOW (convert (c_common_signed_type (type), | |
3581 primop0)))) | |
3582 warning (OPT_Wtype_limits, | |
3583 "comparison of unsigned expression >= 0 is always true"); | |
3584 value = truthvalue_true_node; | |
3585 break; | |
3586 | |
3587 case LT_EXPR: | |
3588 if (warn_type_limits && !in_system_header | |
3589 && !(TREE_CODE (primop0) == INTEGER_CST | |
3590 && !TREE_OVERFLOW (convert (c_common_signed_type (type), | |
3591 primop0)))) | |
3592 warning (OPT_Wtype_limits, | |
3593 "comparison of unsigned expression < 0 is always false"); | |
3594 value = truthvalue_false_node; | |
3595 break; | |
3596 | |
3597 default: | |
3598 break; | |
3599 } | |
3600 | |
3601 if (value != 0) | |
3602 { | |
3603 /* Don't forget to evaluate PRIMOP0 if it has side effects. */ | |
3604 if (TREE_SIDE_EFFECTS (primop0)) | |
3605 return build2 (COMPOUND_EXPR, TREE_TYPE (value), | |
3606 primop0, value); | |
3607 return value; | |
3608 } | |
3609 } | |
3610 } | |
3611 | |
3612 *op0_ptr = convert (type, primop0); | |
3613 *op1_ptr = convert (type, primop1); | |
3614 | |
3615 *restype_ptr = truthvalue_type_node; | |
3616 | |
3617 return 0; | |
3618 } | |
3619 | |
3620 /* Return a tree for the sum or difference (RESULTCODE says which) | |
3621 of pointer PTROP and integer INTOP. */ | |
3622 | |
3623 tree | |
3624 pointer_int_sum (location_t loc, enum tree_code resultcode, | |
3625 tree ptrop, tree intop) | |
3626 { | |
3627 tree size_exp, ret; | |
3628 | |
3629 /* The result is a pointer of the same type that is being added. */ | |
3630 tree result_type = TREE_TYPE (ptrop); | |
3631 | |
3632 if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE) | |
3633 { | |
3634 pedwarn (loc, pedantic ? OPT_pedantic : OPT_Wpointer_arith, | |
3635 "pointer of type %<void *%> used in arithmetic"); | |
3636 size_exp = integer_one_node; | |
3637 } | |
3638 else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE) | |
3639 { | |
3640 pedwarn (loc, pedantic ? OPT_pedantic : OPT_Wpointer_arith, | |
3641 "pointer to a function used in arithmetic"); | |
3642 size_exp = integer_one_node; | |
3643 } | |
3644 else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE) | |
3645 { | |
3646 pedwarn (loc, pedantic ? OPT_pedantic : OPT_Wpointer_arith, | |
3647 "pointer to member function used in arithmetic"); | |
3648 size_exp = integer_one_node; | |
3649 } | |
3650 else | |
3651 size_exp = size_in_bytes (TREE_TYPE (result_type)); | |
3652 | |
3653 /* We are manipulating pointer values, so we don't need to warn | |
3654 about relying on undefined signed overflow. We disable the | |
3655 warning here because we use integer types so fold won't know that | |
3656 they are really pointers. */ | |
3657 fold_defer_overflow_warnings (); | |
3658 | |
3659 /* If what we are about to multiply by the size of the elements | |
3660 contains a constant term, apply distributive law | |
3661 and multiply that constant term separately. | |
3662 This helps produce common subexpressions. */ | |
3663 if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR) | |
3664 && !TREE_CONSTANT (intop) | |
3665 && TREE_CONSTANT (TREE_OPERAND (intop, 1)) | |
3666 && TREE_CONSTANT (size_exp) | |
3667 /* If the constant comes from pointer subtraction, | |
3668 skip this optimization--it would cause an error. */ | |
3669 && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE | |
3670 /* If the constant is unsigned, and smaller than the pointer size, | |
3671 then we must skip this optimization. This is because it could cause | |
3672 an overflow error if the constant is negative but INTOP is not. */ | |
3673 && (!TYPE_UNSIGNED (TREE_TYPE (intop)) | |
3674 || (TYPE_PRECISION (TREE_TYPE (intop)) | |
3675 == TYPE_PRECISION (TREE_TYPE (ptrop))))) | |
3676 { | |
3677 enum tree_code subcode = resultcode; | |
3678 tree int_type = TREE_TYPE (intop); | |
3679 if (TREE_CODE (intop) == MINUS_EXPR) | |
3680 subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR); | |
3681 /* Convert both subexpression types to the type of intop, | |
3682 because weird cases involving pointer arithmetic | |
3683 can result in a sum or difference with different type args. */ | |
3684 ptrop = build_binary_op (EXPR_LOCATION (TREE_OPERAND (intop, 1)), | |
3685 subcode, ptrop, | |
3686 convert (int_type, TREE_OPERAND (intop, 1)), 1); | |
3687 intop = convert (int_type, TREE_OPERAND (intop, 0)); | |
3688 } | |
3689 | |
3690 /* Convert the integer argument to a type the same size as sizetype | |
3691 so the multiply won't overflow spuriously. */ | |
3692 if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype) | |
3693 || TYPE_UNSIGNED (TREE_TYPE (intop)) != TYPE_UNSIGNED (sizetype)) | |
3694 intop = convert (c_common_type_for_size (TYPE_PRECISION (sizetype), | |
3695 TYPE_UNSIGNED (sizetype)), intop); | |
3696 | |
3697 /* Replace the integer argument with a suitable product by the object size. | |
3698 Do this multiplication as signed, then convert to the appropriate type | |
3699 for the pointer operation and disregard an overflow that occured only | |
3700 because of the sign-extension change in the latter conversion. */ | |
3701 { | |
3702 tree t = build_binary_op (loc, | |
3703 MULT_EXPR, intop, | |
3704 convert (TREE_TYPE (intop), size_exp), 1); | |
3705 intop = convert (sizetype, t); | |
3706 if (TREE_OVERFLOW_P (intop) && !TREE_OVERFLOW (t)) | |
3707 intop = build_int_cst_wide (TREE_TYPE (intop), TREE_INT_CST_LOW (intop), | |
3708 TREE_INT_CST_HIGH (intop)); | |
3709 } | |
3710 | |
3711 /* Create the sum or difference. */ | |
3712 if (resultcode == MINUS_EXPR) | |
3713 intop = fold_build1_loc (loc, NEGATE_EXPR, sizetype, intop); | |
3714 | |
3715 ret = fold_build2_loc (loc, POINTER_PLUS_EXPR, result_type, ptrop, intop); | |
3716 | |
3717 fold_undefer_and_ignore_overflow_warnings (); | |
3718 | |
3719 return ret; | |
3720 } | |
3721 | |
3722 /* Wrap a C_MAYBE_CONST_EXPR around an expression that is fully folded | |
3723 and if NON_CONST is known not to be permitted in an evaluated part | |
3724 of a constant expression. */ | |
3725 | |
3726 tree | |
3727 c_wrap_maybe_const (tree expr, bool non_const) | |
3728 { | |
3729 bool nowarning = TREE_NO_WARNING (expr); | |
3730 location_t loc = EXPR_LOCATION (expr); | |
3731 | |
3732 /* This should never be called for C++. */ | |
3733 if (c_dialect_cxx ()) | |
3734 gcc_unreachable (); | |
3735 | |
3736 /* The result of folding may have a NOP_EXPR to set TREE_NO_WARNING. */ | |
3737 STRIP_TYPE_NOPS (expr); | |
3738 expr = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (expr), NULL, expr); | |
3739 C_MAYBE_CONST_EXPR_NON_CONST (expr) = non_const; | |
3740 if (nowarning) | |
3741 TREE_NO_WARNING (expr) = 1; | |
3742 protected_set_expr_location (expr, loc); | |
3743 | |
3744 return expr; | |
3745 } | |
3746 | |
3747 /* Wrap a SAVE_EXPR around EXPR, if appropriate. Like save_expr, but | |
3748 for C folds the inside expression and wraps a C_MAYBE_CONST_EXPR | |
3749 around the SAVE_EXPR if needed so that c_fully_fold does not need | |
3750 to look inside SAVE_EXPRs. */ | |
3751 | |
3752 tree | |
3753 c_save_expr (tree expr) | |
3754 { | |
3755 bool maybe_const = true; | |
3756 if (c_dialect_cxx ()) | |
3757 return save_expr (expr); | |
3758 expr = c_fully_fold (expr, false, &maybe_const); | |
3759 expr = save_expr (expr); | |
3760 if (!maybe_const) | |
3761 expr = c_wrap_maybe_const (expr, true); | |
3762 return expr; | |
3763 } | |
3764 | |
3765 /* Return whether EXPR is a declaration whose address can never be | |
3766 NULL. */ | |
3767 | |
3768 bool | |
3769 decl_with_nonnull_addr_p (const_tree expr) | |
3770 { | |
3771 return (DECL_P (expr) | |
3772 && (TREE_CODE (expr) == PARM_DECL | |
3773 || TREE_CODE (expr) == LABEL_DECL | |
3774 || !DECL_WEAK (expr))); | |
3775 } | |
3776 | |
3777 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR, | |
3778 or for an `if' or `while' statement or ?..: exp. It should already | |
3779 have been validated to be of suitable type; otherwise, a bad | |
3780 diagnostic may result. | |
3781 | |
3782 The EXPR is located at LOCATION. | |
3783 | |
3784 This preparation consists of taking the ordinary | |
3785 representation of an expression expr and producing a valid tree | |
3786 boolean expression describing whether expr is nonzero. We could | |
3787 simply always do build_binary_op (NE_EXPR, expr, truthvalue_false_node, 1), | |
3788 but we optimize comparisons, &&, ||, and !. | |
3789 | |
3790 The resulting type should always be `truthvalue_type_node'. */ | |
3791 | |
3792 tree | |
3793 c_common_truthvalue_conversion (location_t location, tree expr) | |
3794 { | |
3795 switch (TREE_CODE (expr)) | |
3796 { | |
3797 case EQ_EXPR: case NE_EXPR: case UNEQ_EXPR: case LTGT_EXPR: | |
3798 case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR: | |
3799 case UNLE_EXPR: case UNGE_EXPR: case UNLT_EXPR: case UNGT_EXPR: | |
3800 case ORDERED_EXPR: case UNORDERED_EXPR: | |
3801 if (TREE_TYPE (expr) == truthvalue_type_node) | |
3802 return expr; | |
3803 expr = build2 (TREE_CODE (expr), truthvalue_type_node, | |
3804 TREE_OPERAND (expr, 0), TREE_OPERAND (expr, 1)); | |
3805 goto ret; | |
3806 | |
3807 case TRUTH_ANDIF_EXPR: | |
3808 case TRUTH_ORIF_EXPR: | |
3809 case TRUTH_AND_EXPR: | |
3810 case TRUTH_OR_EXPR: | |
3811 case TRUTH_XOR_EXPR: | |
3812 if (TREE_TYPE (expr) == truthvalue_type_node) | |
3813 return expr; | |
3814 expr = build2 (TREE_CODE (expr), truthvalue_type_node, | |
3815 c_common_truthvalue_conversion (location, | |
3816 TREE_OPERAND (expr, 0)), | |
3817 c_common_truthvalue_conversion (location, | |
3818 TREE_OPERAND (expr, 1))); | |
3819 goto ret; | |
3820 | |
3821 case TRUTH_NOT_EXPR: | |
3822 if (TREE_TYPE (expr) == truthvalue_type_node) | |
3823 return expr; | |
3824 expr = build1 (TREE_CODE (expr), truthvalue_type_node, | |
3825 c_common_truthvalue_conversion (location, | |
3826 TREE_OPERAND (expr, 0))); | |
3827 goto ret; | |
3828 | |
3829 case ERROR_MARK: | |
3830 return expr; | |
3831 | |
3832 case INTEGER_CST: | |
3833 return integer_zerop (expr) ? truthvalue_false_node | |
3834 : truthvalue_true_node; | |
3835 | |
3836 case REAL_CST: | |
3837 return real_compare (NE_EXPR, &TREE_REAL_CST (expr), &dconst0) | |
3838 ? truthvalue_true_node | |
3839 : truthvalue_false_node; | |
3840 | |
3841 case FIXED_CST: | |
3842 return fixed_compare (NE_EXPR, &TREE_FIXED_CST (expr), | |
3843 &FCONST0 (TYPE_MODE (TREE_TYPE (expr)))) | |
3844 ? truthvalue_true_node | |
3845 : truthvalue_false_node; | |
3846 | |
3847 case FUNCTION_DECL: | |
3848 expr = build_unary_op (location, ADDR_EXPR, expr, 0); | |
3849 /* Fall through. */ | |
3850 | |
3851 case ADDR_EXPR: | |
3852 { | |
3853 tree inner = TREE_OPERAND (expr, 0); | |
3854 if (decl_with_nonnull_addr_p (inner)) | |
3855 { | |
3856 /* Common Ada/Pascal programmer's mistake. */ | |
3857 warning_at (location, | |
3858 OPT_Waddress, | |
3859 "the address of %qD will always evaluate as %<true%>", | |
3860 inner); | |
3861 return truthvalue_true_node; | |
3862 } | |
3863 break; | |
3864 } | |
3865 | |
3866 case COMPLEX_EXPR: | |
3867 expr = build_binary_op (EXPR_LOCATION (expr), | |
3868 (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)) | |
3869 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR), | |
3870 c_common_truthvalue_conversion (location, | |
3871 TREE_OPERAND (expr, 0)), | |
3872 c_common_truthvalue_conversion (location, | |
3873 TREE_OPERAND (expr, 1)), | |
3874 0); | |
3875 goto ret; | |
3876 | |
3877 case NEGATE_EXPR: | |
3878 case ABS_EXPR: | |
3879 case FLOAT_EXPR: | |
3880 case EXCESS_PRECISION_EXPR: | |
3881 /* These don't change whether an object is nonzero or zero. */ | |
3882 return c_common_truthvalue_conversion (location, TREE_OPERAND (expr, 0)); | |
3883 | |
3884 case LROTATE_EXPR: | |
3885 case RROTATE_EXPR: | |
3886 /* These don't change whether an object is zero or nonzero, but | |
3887 we can't ignore them if their second arg has side-effects. */ | |
3888 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))) | |
3889 { | |
3890 expr = build2 (COMPOUND_EXPR, truthvalue_type_node, | |
3891 TREE_OPERAND (expr, 1), | |
3892 c_common_truthvalue_conversion | |
3893 (location, TREE_OPERAND (expr, 0))); | |
3894 goto ret; | |
3895 } | |
3896 else | |
3897 return c_common_truthvalue_conversion (location, | |
3898 TREE_OPERAND (expr, 0)); | |
3899 | |
3900 case COND_EXPR: | |
3901 /* Distribute the conversion into the arms of a COND_EXPR. */ | |
3902 if (c_dialect_cxx ()) | |
3903 { | |
3904 expr = fold_build3_loc (location, COND_EXPR, truthvalue_type_node, | |
3905 TREE_OPERAND (expr, 0), | |
3906 c_common_truthvalue_conversion (location, | |
3907 TREE_OPERAND (expr, | |
3908 1)), | |
3909 c_common_truthvalue_conversion (location, | |
3910 TREE_OPERAND (expr, | |
3911 2))); | |
3912 goto ret; | |
3913 } | |
3914 else | |
3915 { | |
3916 /* Folding will happen later for C. */ | |
3917 expr = build3 (COND_EXPR, truthvalue_type_node, | |
3918 TREE_OPERAND (expr, 0), | |
3919 c_common_truthvalue_conversion (location, | |
3920 TREE_OPERAND (expr, 1)), | |
3921 c_common_truthvalue_conversion (location, | |
3922 TREE_OPERAND (expr, 2))); | |
3923 goto ret; | |
3924 } | |
3925 | |
3926 CASE_CONVERT: | |
3927 /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE, | |
3928 since that affects how `default_conversion' will behave. */ | |
3929 if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE | |
3930 || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE) | |
3931 break; | |
3932 /* If this is widening the argument, we can ignore it. */ | |
3933 if (TYPE_PRECISION (TREE_TYPE (expr)) | |
3934 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0)))) | |
3935 return c_common_truthvalue_conversion (location, | |
3936 TREE_OPERAND (expr, 0)); | |
3937 break; | |
3938 | |
3939 case MODIFY_EXPR: | |
3940 if (!TREE_NO_WARNING (expr) | |
3941 && warn_parentheses) | |
3942 { | |
3943 warning (OPT_Wparentheses, | |
3944 "suggest parentheses around assignment used as truth value"); | |
3945 TREE_NO_WARNING (expr) = 1; | |
3946 } | |
3947 break; | |
3948 | |
3949 default: | |
3950 break; | |
3951 } | |
3952 | |
3953 if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE) | |
3954 { | |
3955 tree t = (in_late_binary_op ? save_expr (expr) : c_save_expr (expr)); | |
3956 expr = (build_binary_op | |
3957 (EXPR_LOCATION (expr), | |
3958 (TREE_SIDE_EFFECTS (expr) | |
3959 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR), | |
3960 c_common_truthvalue_conversion | |
3961 (location, | |
3962 build_unary_op (location, REALPART_EXPR, t, 0)), | |
3963 c_common_truthvalue_conversion | |
3964 (location, | |
3965 build_unary_op (location, IMAGPART_EXPR, t, 0)), | |
3966 0)); | |
3967 goto ret; | |
3968 } | |
3969 | |
3970 if (TREE_CODE (TREE_TYPE (expr)) == FIXED_POINT_TYPE) | |
3971 { | |
3972 tree fixed_zero_node = build_fixed (TREE_TYPE (expr), | |
3973 FCONST0 (TYPE_MODE | |
3974 (TREE_TYPE (expr)))); | |
3975 return build_binary_op (location, NE_EXPR, expr, fixed_zero_node, 1); | |
3976 } | |
3977 else | |
3978 return build_binary_op (location, NE_EXPR, expr, integer_zero_node, 1); | |
3979 | |
3980 ret: | |
3981 protected_set_expr_location (expr, location); | |
3982 return expr; | |
3983 } | |
3984 | |
3985 static void def_builtin_1 (enum built_in_function fncode, | |
3986 const char *name, | |
3987 enum built_in_class fnclass, | |
3988 tree fntype, tree libtype, | |
3989 bool both_p, bool fallback_p, bool nonansi_p, | |
3990 tree fnattrs, bool implicit_p); | |
3991 | |
3992 | |
3993 /* Apply the TYPE_QUALS to the new DECL. */ | |
3994 | |
3995 void | |
3996 c_apply_type_quals_to_decl (int type_quals, tree decl) | |
3997 { | |
3998 tree type = TREE_TYPE (decl); | |
3999 | |
4000 if (type == error_mark_node) | |
4001 return; | |
4002 | |
4003 if (((type_quals & TYPE_QUAL_CONST) | |
4004 || (type && TREE_CODE (type) == REFERENCE_TYPE)) | |
4005 /* An object declared 'const' is only readonly after it is | |
4006 initialized. We don't have any way of expressing this currently, | |
4007 so we need to be conservative and unset TREE_READONLY for types | |
4008 with constructors. Otherwise aliasing code will ignore stores in | |
4009 an inline constructor. */ | |
4010 && !(type && TYPE_NEEDS_CONSTRUCTING (type))) | |
4011 TREE_READONLY (decl) = 1; | |
4012 if (type_quals & TYPE_QUAL_VOLATILE) | |
4013 { | |
4014 TREE_SIDE_EFFECTS (decl) = 1; | |
4015 TREE_THIS_VOLATILE (decl) = 1; | |
4016 } | |
4017 if (type_quals & TYPE_QUAL_RESTRICT) | |
4018 { | |
4019 while (type && TREE_CODE (type) == ARRAY_TYPE) | |
4020 /* Allow 'restrict' on arrays of pointers. | |
4021 FIXME currently we just ignore it. */ | |
4022 type = TREE_TYPE (type); | |
4023 if (!type | |
4024 || !POINTER_TYPE_P (type) | |
4025 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))) | |
4026 error ("invalid use of %<restrict%>"); | |
4027 } | |
4028 } | |
4029 | |
4030 /* Hash function for the problem of multiple type definitions in | |
4031 different files. This must hash all types that will compare | |
4032 equal via comptypes to the same value. In practice it hashes | |
4033 on some of the simple stuff and leaves the details to comptypes. */ | |
4034 | |
4035 static hashval_t | |
4036 c_type_hash (const void *p) | |
4037 { | |
4038 int n_elements; | |
4039 int shift, size; | |
4040 const_tree const t = (const_tree) p; | |
4041 tree t2; | |
4042 switch (TREE_CODE (t)) | |
4043 { | |
4044 /* For pointers, hash on pointee type plus some swizzling. */ | |
4045 case POINTER_TYPE: | |
4046 return c_type_hash (TREE_TYPE (t)) ^ 0x3003003; | |
4047 /* Hash on number of elements and total size. */ | |
4048 case ENUMERAL_TYPE: | |
4049 shift = 3; | |
4050 t2 = TYPE_VALUES (t); | |
4051 break; | |
4052 case RECORD_TYPE: | |
4053 shift = 0; | |
4054 t2 = TYPE_FIELDS (t); | |
4055 break; | |
4056 case QUAL_UNION_TYPE: | |
4057 shift = 1; | |
4058 t2 = TYPE_FIELDS (t); | |
4059 break; | |
4060 case UNION_TYPE: | |
4061 shift = 2; | |
4062 t2 = TYPE_FIELDS (t); | |
4063 break; | |
4064 default: | |
4065 gcc_unreachable (); | |
4066 } | |
4067 /* FIXME: We want to use a DECL_CHAIN iteration method here, but | |
4068 TYPE_VALUES of ENUMERAL_TYPEs is stored as a TREE_LIST. */ | |
4069 n_elements = list_length (t2); | |
4070 /* We might have a VLA here. */ | |
4071 if (TREE_CODE (TYPE_SIZE (t)) != INTEGER_CST) | |
4072 size = 0; | |
4073 else | |
4074 size = TREE_INT_CST_LOW (TYPE_SIZE (t)); | |
4075 return ((size << 24) | (n_elements << shift)); | |
4076 } | |
4077 | |
4078 static GTY((param_is (union tree_node))) htab_t type_hash_table; | |
4079 | |
4080 /* Return the typed-based alias set for T, which may be an expression | |
4081 or a type. Return -1 if we don't do anything special. */ | |
4082 | |
4083 alias_set_type | |
4084 c_common_get_alias_set (tree t) | |
4085 { | |
4086 tree u; | |
4087 PTR *slot; | |
4088 | |
4089 /* For VLAs, use the alias set of the element type rather than the | |
4090 default of alias set 0 for types compared structurally. */ | |
4091 if (TYPE_P (t) && TYPE_STRUCTURAL_EQUALITY_P (t)) | |
4092 { | |
4093 if (TREE_CODE (t) == ARRAY_TYPE) | |
4094 return get_alias_set (TREE_TYPE (t)); | |
4095 return -1; | |
4096 } | |
4097 | |
4098 /* Permit type-punning when accessing a union, provided the access | |
4099 is directly through the union. For example, this code does not | |
4100 permit taking the address of a union member and then storing | |
4101 through it. Even the type-punning allowed here is a GCC | |
4102 extension, albeit a common and useful one; the C standard says | |
4103 that such accesses have implementation-defined behavior. */ | |
4104 for (u = t; | |
4105 TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF; | |
4106 u = TREE_OPERAND (u, 0)) | |
4107 if (TREE_CODE (u) == COMPONENT_REF | |
4108 && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE) | |
4109 return 0; | |
4110 | |
4111 /* That's all the expressions we handle specially. */ | |
4112 if (!TYPE_P (t)) | |
4113 return -1; | |
4114 | |
4115 /* The C standard guarantees that any object may be accessed via an | |
4116 lvalue that has character type. */ | |
4117 if (t == char_type_node | |
4118 || t == signed_char_type_node | |
4119 || t == unsigned_char_type_node) | |
4120 return 0; | |
4121 | |
4122 /* The C standard specifically allows aliasing between signed and | |
4123 unsigned variants of the same type. We treat the signed | |
4124 variant as canonical. */ | |
4125 if (TREE_CODE (t) == INTEGER_TYPE && TYPE_UNSIGNED (t)) | |
4126 { | |
4127 tree t1 = c_common_signed_type (t); | |
4128 | |
4129 /* t1 == t can happen for boolean nodes which are always unsigned. */ | |
4130 if (t1 != t) | |
4131 return get_alias_set (t1); | |
4132 } | |
4133 | |
4134 /* Handle the case of multiple type nodes referring to "the same" type, | |
4135 which occurs with IMA. These share an alias set. FIXME: Currently only | |
4136 C90 is handled. (In C99 type compatibility is not transitive, which | |
4137 complicates things mightily. The alias set splay trees can theoretically | |
4138 represent this, but insertion is tricky when you consider all the | |
4139 different orders things might arrive in.) */ | |
4140 | |
4141 if (c_language != clk_c || flag_isoc99) | |
4142 return -1; | |
4143 | |
4144 /* Save time if there's only one input file. */ | |
4145 if (num_in_fnames == 1) | |
4146 return -1; | |
4147 | |
4148 /* Pointers need special handling if they point to any type that | |
4149 needs special handling (below). */ | |
4150 if (TREE_CODE (t) == POINTER_TYPE) | |
4151 { | |
4152 tree t2; | |
4153 /* Find bottom type under any nested POINTERs. */ | |
4154 for (t2 = TREE_TYPE (t); | |
4155 TREE_CODE (t2) == POINTER_TYPE; | |
4156 t2 = TREE_TYPE (t2)) | |
4157 ; | |
4158 if (TREE_CODE (t2) != RECORD_TYPE | |
4159 && TREE_CODE (t2) != ENUMERAL_TYPE | |
4160 && TREE_CODE (t2) != QUAL_UNION_TYPE | |
4161 && TREE_CODE (t2) != UNION_TYPE) | |
4162 return -1; | |
4163 if (TYPE_SIZE (t2) == 0) | |
4164 return -1; | |
4165 } | |
4166 /* These are the only cases that need special handling. */ | |
4167 if (TREE_CODE (t) != RECORD_TYPE | |
4168 && TREE_CODE (t) != ENUMERAL_TYPE | |
4169 && TREE_CODE (t) != QUAL_UNION_TYPE | |
4170 && TREE_CODE (t) != UNION_TYPE | |
4171 && TREE_CODE (t) != POINTER_TYPE) | |
4172 return -1; | |
4173 /* Undefined? */ | |
4174 if (TYPE_SIZE (t) == 0) | |
4175 return -1; | |
4176 | |
4177 /* Look up t in hash table. Only one of the compatible types within each | |
4178 alias set is recorded in the table. */ | |
4179 if (!type_hash_table) | |
4180 type_hash_table = htab_create_ggc (1021, c_type_hash, | |
4181 (htab_eq) lang_hooks.types_compatible_p, | |
4182 NULL); | |
4183 slot = htab_find_slot (type_hash_table, t, INSERT); | |
4184 if (*slot != NULL) | |
4185 { | |
4186 TYPE_ALIAS_SET (t) = TYPE_ALIAS_SET ((tree)*slot); | |
4187 return TYPE_ALIAS_SET ((tree)*slot); | |
4188 } | |
4189 else | |
4190 /* Our caller will assign and record (in t) a new alias set; all we need | |
4191 to do is remember t in the hash table. */ | |
4192 *slot = t; | |
4193 | |
4194 return -1; | |
4195 } | |
4196 | |
4197 /* Compute the value of 'sizeof (TYPE)' or '__alignof__ (TYPE)', where | |
4198 the second parameter indicates which OPERATOR is being applied. | |
4199 The COMPLAIN flag controls whether we should diagnose possibly | |
4200 ill-formed constructs or not. LOC is the location of the SIZEOF or | |
4201 TYPEOF operator. */ | |
4202 | |
4203 tree | |
4204 c_sizeof_or_alignof_type (location_t loc, | |
4205 tree type, bool is_sizeof, int complain) | |
4206 { | |
4207 const char *op_name; | |
4208 tree value = NULL; | |
4209 enum tree_code type_code = TREE_CODE (type); | |
4210 | |
4211 op_name = is_sizeof ? "sizeof" : "__alignof__"; | |
4212 | |
4213 if (type_code == FUNCTION_TYPE) | |
4214 { | |
4215 if (is_sizeof) | |
4216 { | |
4217 if (complain && (pedantic || warn_pointer_arith)) | |
4218 pedwarn (loc, pedantic ? OPT_pedantic : OPT_Wpointer_arith, | |
4219 "invalid application of %<sizeof%> to a function type"); | |
4220 else if (!complain) | |
4221 return error_mark_node; | |
4222 value = size_one_node; | |
4223 } | |
4224 else | |
4225 value = size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT); | |
4226 } | |
4227 else if (type_code == VOID_TYPE || type_code == ERROR_MARK) | |
4228 { | |
4229 if (type_code == VOID_TYPE | |
4230 && complain && (pedantic || warn_pointer_arith)) | |
4231 pedwarn (loc, pedantic ? OPT_pedantic : OPT_Wpointer_arith, | |
4232 "invalid application of %qs to a void type", op_name); | |
4233 else if (!complain) | |
4234 return error_mark_node; | |
4235 value = size_one_node; | |
4236 } | |
4237 else if (!COMPLETE_TYPE_P (type)) | |
4238 { | |
4239 if (complain) | |
4240 error_at (loc, "invalid application of %qs to incomplete type %qT ", | |
4241 op_name, type); | |
4242 return error_mark_node; | |
4243 } | |
4244 else | |
4245 { | |
4246 if (is_sizeof) | |
4247 /* Convert in case a char is more than one unit. */ | |
4248 value = size_binop_loc (loc, CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type), | |
4249 size_int (TYPE_PRECISION (char_type_node) | |
4250 / BITS_PER_UNIT)); | |
4251 else | |
4252 value = size_int (TYPE_ALIGN_UNIT (type)); | |
4253 } | |
4254 | |
4255 /* VALUE will have an integer type with TYPE_IS_SIZETYPE set. | |
4256 TYPE_IS_SIZETYPE means that certain things (like overflow) will | |
4257 never happen. However, this node should really have type | |
4258 `size_t', which is just a typedef for an ordinary integer type. */ | |
4259 value = fold_convert_loc (loc, size_type_node, value); | |
4260 gcc_assert (!TYPE_IS_SIZETYPE (TREE_TYPE (value))); | |
4261 | |
4262 return value; | |
4263 } | |
4264 | |
4265 /* Implement the __alignof keyword: Return the minimum required | |
4266 alignment of EXPR, measured in bytes. For VAR_DECLs, | |
4267 FUNCTION_DECLs and FIELD_DECLs return DECL_ALIGN (which can be set | |
4268 from an "aligned" __attribute__ specification). LOC is the | |
4269 location of the ALIGNOF operator. */ | |
4270 | |
4271 tree | |
4272 c_alignof_expr (location_t loc, tree expr) | |
4273 { | |
4274 tree t; | |
4275 | |
4276 if (VAR_OR_FUNCTION_DECL_P (expr)) | |
4277 t = size_int (DECL_ALIGN_UNIT (expr)); | |
4278 | |
4279 else if (TREE_CODE (expr) == COMPONENT_REF | |
4280 && DECL_C_BIT_FIELD (TREE_OPERAND (expr, 1))) | |
4281 { | |
4282 error_at (loc, "%<__alignof%> applied to a bit-field"); | |
4283 t = size_one_node; | |
4284 } | |
4285 else if (TREE_CODE (expr) == COMPONENT_REF | |
4286 && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL) | |
4287 t = size_int (DECL_ALIGN_UNIT (TREE_OPERAND (expr, 1))); | |
4288 | |
4289 else if (TREE_CODE (expr) == INDIRECT_REF) | |
4290 { | |
4291 tree t = TREE_OPERAND (expr, 0); | |
4292 tree best = t; | |
4293 int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
4294 | |
4295 while (CONVERT_EXPR_P (t) | |
4296 && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE) | |
4297 { | |
4298 int thisalign; | |
4299 | |
4300 t = TREE_OPERAND (t, 0); | |
4301 thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t))); | |
4302 if (thisalign > bestalign) | |
4303 best = t, bestalign = thisalign; | |
4304 } | |
4305 return c_alignof (loc, TREE_TYPE (TREE_TYPE (best))); | |
4306 } | |
4307 else | |
4308 return c_alignof (loc, TREE_TYPE (expr)); | |
4309 | |
4310 return fold_convert_loc (loc, size_type_node, t); | |
4311 } | |
4312 | |
4313 /* Handle C and C++ default attributes. */ | |
4314 | |
4315 enum built_in_attribute | |
4316 { | |
4317 #define DEF_ATTR_NULL_TREE(ENUM) ENUM, | |
4318 #define DEF_ATTR_INT(ENUM, VALUE) ENUM, | |
4319 #define DEF_ATTR_IDENT(ENUM, STRING) ENUM, | |
4320 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM, | |
4321 #include "builtin-attrs.def" | |
4322 #undef DEF_ATTR_NULL_TREE | |
4323 #undef DEF_ATTR_INT | |
4324 #undef DEF_ATTR_IDENT | |
4325 #undef DEF_ATTR_TREE_LIST | |
4326 ATTR_LAST | |
4327 }; | |
4328 | |
4329 static GTY(()) tree built_in_attributes[(int) ATTR_LAST]; | |
4330 | |
4331 static void c_init_attributes (void); | |
4332 | |
4333 enum c_builtin_type | |
4334 { | |
4335 #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME, | |
4336 #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME, | |
4337 #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME, | |
4338 #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME, | |
4339 #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
4340 #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
4341 #define DEF_FUNCTION_TYPE_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) NAME, | |
4342 #define DEF_FUNCTION_TYPE_6(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6) NAME, | |
4343 #define DEF_FUNCTION_TYPE_7(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7) NAME, | |
4344 #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME, | |
4345 #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME, | |
4346 #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME, | |
4347 #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
4348 #define DEF_FUNCTION_TYPE_VAR_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
4349 #define DEF_FUNCTION_TYPE_VAR_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG6) \ | |
4350 NAME, | |
4351 #define DEF_POINTER_TYPE(NAME, TYPE) NAME, | |
4352 #include "builtin-types.def" | |
4353 #undef DEF_PRIMITIVE_TYPE | |
4354 #undef DEF_FUNCTION_TYPE_0 | |
4355 #undef DEF_FUNCTION_TYPE_1 | |
4356 #undef DEF_FUNCTION_TYPE_2 | |
4357 #undef DEF_FUNCTION_TYPE_3 | |
4358 #undef DEF_FUNCTION_TYPE_4 | |
4359 #undef DEF_FUNCTION_TYPE_5 | |
4360 #undef DEF_FUNCTION_TYPE_6 | |
4361 #undef DEF_FUNCTION_TYPE_7 | |
4362 #undef DEF_FUNCTION_TYPE_VAR_0 | |
4363 #undef DEF_FUNCTION_TYPE_VAR_1 | |
4364 #undef DEF_FUNCTION_TYPE_VAR_2 | |
4365 #undef DEF_FUNCTION_TYPE_VAR_3 | |
4366 #undef DEF_FUNCTION_TYPE_VAR_4 | |
4367 #undef DEF_FUNCTION_TYPE_VAR_5 | |
4368 #undef DEF_POINTER_TYPE | |
4369 BT_LAST | |
4370 }; | |
4371 | |
4372 typedef enum c_builtin_type builtin_type; | |
4373 | |
4374 /* A temporary array for c_common_nodes_and_builtins. Used in | |
4375 communication with def_fn_type. */ | |
4376 static tree builtin_types[(int) BT_LAST + 1]; | |
4377 | |
4378 /* A helper function for c_common_nodes_and_builtins. Build function type | |
4379 for DEF with return type RET and N arguments. If VAR is true, then the | |
4380 function should be variadic after those N arguments. | |
4381 | |
4382 Takes special care not to ICE if any of the types involved are | |
4383 error_mark_node, which indicates that said type is not in fact available | |
4384 (see builtin_type_for_size). In which case the function type as a whole | |
4385 should be error_mark_node. */ | |
4386 | |
4387 static void | |
4388 def_fn_type (builtin_type def, builtin_type ret, bool var, int n, ...) | |
4389 { | |
4390 tree args = NULL, t; | |
4391 va_list list; | |
4392 int i; | |
4393 | |
4394 va_start (list, n); | |
4395 for (i = 0; i < n; ++i) | |
4396 { | |
4397 builtin_type a = (builtin_type) va_arg (list, int); | |
4398 t = builtin_types[a]; | |
4399 if (t == error_mark_node) | |
4400 goto egress; | |
4401 args = tree_cons (NULL_TREE, t, args); | |
4402 } | |
4403 va_end (list); | |
4404 | |
4405 args = nreverse (args); | |
4406 if (!var) | |
4407 args = chainon (args, void_list_node); | |
4408 | |
4409 t = builtin_types[ret]; | |
4410 if (t == error_mark_node) | |
4411 goto egress; | |
4412 t = build_function_type (t, args); | |
4413 | |
4414 egress: | |
4415 builtin_types[def] = t; | |
4416 } | |
4417 | |
4418 /* Build builtin functions common to both C and C++ language | |
4419 frontends. */ | |
4420 | |
4421 static void | |
4422 c_define_builtins (tree va_list_ref_type_node, tree va_list_arg_type_node) | |
4423 { | |
4424 #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \ | |
4425 builtin_types[ENUM] = VALUE; | |
4426 #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \ | |
4427 def_fn_type (ENUM, RETURN, 0, 0); | |
4428 #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \ | |
4429 def_fn_type (ENUM, RETURN, 0, 1, ARG1); | |
4430 #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \ | |
4431 def_fn_type (ENUM, RETURN, 0, 2, ARG1, ARG2); | |
4432 #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
4433 def_fn_type (ENUM, RETURN, 0, 3, ARG1, ARG2, ARG3); | |
4434 #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
4435 def_fn_type (ENUM, RETURN, 0, 4, ARG1, ARG2, ARG3, ARG4); | |
4436 #define DEF_FUNCTION_TYPE_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ | |
4437 def_fn_type (ENUM, RETURN, 0, 5, ARG1, ARG2, ARG3, ARG4, ARG5); | |
4438 #define DEF_FUNCTION_TYPE_6(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
4439 ARG6) \ | |
4440 def_fn_type (ENUM, RETURN, 0, 6, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6); | |
4441 #define DEF_FUNCTION_TYPE_7(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
4442 ARG6, ARG7) \ | |
4443 def_fn_type (ENUM, RETURN, 0, 7, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7); | |
4444 #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \ | |
4445 def_fn_type (ENUM, RETURN, 1, 0); | |
4446 #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \ | |
4447 def_fn_type (ENUM, RETURN, 1, 1, ARG1); | |
4448 #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \ | |
4449 def_fn_type (ENUM, RETURN, 1, 2, ARG1, ARG2); | |
4450 #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
4451 def_fn_type (ENUM, RETURN, 1, 3, ARG1, ARG2, ARG3); | |
4452 #define DEF_FUNCTION_TYPE_VAR_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
4453 def_fn_type (ENUM, RETURN, 1, 4, ARG1, ARG2, ARG3, ARG4); | |
4454 #define DEF_FUNCTION_TYPE_VAR_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ | |
4455 def_fn_type (ENUM, RETURN, 1, 5, ARG1, ARG2, ARG3, ARG4, ARG5); | |
4456 #define DEF_POINTER_TYPE(ENUM, TYPE) \ | |
4457 builtin_types[(int) ENUM] = build_pointer_type (builtin_types[(int) TYPE]); | |
4458 | |
4459 #include "builtin-types.def" | |
4460 | |
4461 #undef DEF_PRIMITIVE_TYPE | |
4462 #undef DEF_FUNCTION_TYPE_1 | |
4463 #undef DEF_FUNCTION_TYPE_2 | |
4464 #undef DEF_FUNCTION_TYPE_3 | |
4465 #undef DEF_FUNCTION_TYPE_4 | |
4466 #undef DEF_FUNCTION_TYPE_5 | |
4467 #undef DEF_FUNCTION_TYPE_6 | |
4468 #undef DEF_FUNCTION_TYPE_VAR_0 | |
4469 #undef DEF_FUNCTION_TYPE_VAR_1 | |
4470 #undef DEF_FUNCTION_TYPE_VAR_2 | |
4471 #undef DEF_FUNCTION_TYPE_VAR_3 | |
4472 #undef DEF_FUNCTION_TYPE_VAR_4 | |
4473 #undef DEF_FUNCTION_TYPE_VAR_5 | |
4474 #undef DEF_POINTER_TYPE | |
4475 builtin_types[(int) BT_LAST] = NULL_TREE; | |
4476 | |
4477 c_init_attributes (); | |
4478 | |
4479 #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, FALLBACK_P, \ | |
4480 NONANSI_P, ATTRS, IMPLICIT, COND) \ | |
4481 if (NAME && COND) \ | |
4482 def_builtin_1 (ENUM, NAME, CLASS, \ | |
4483 builtin_types[(int) TYPE], \ | |
4484 builtin_types[(int) LIBTYPE], \ | |
4485 BOTH_P, FALLBACK_P, NONANSI_P, \ | |
4486 built_in_attributes[(int) ATTRS], IMPLICIT); | |
4487 #include "builtins.def" | |
4488 #undef DEF_BUILTIN | |
4489 | |
4490 targetm.init_builtins (); | |
4491 | |
4492 build_common_builtin_nodes (); | |
4493 | |
4494 if (flag_mudflap) | |
4495 mudflap_init (); | |
4496 } | |
4497 | |
4498 /* Like get_identifier, but avoid warnings about null arguments when | |
4499 the argument may be NULL for targets where GCC lacks stdint.h type | |
4500 information. */ | |
4501 | |
4502 static inline tree | |
4503 c_get_ident (const char *id) | |
4504 { | |
4505 return get_identifier (id); | |
4506 } | |
4507 | |
4508 /* Build tree nodes and builtin functions common to both C and C++ language | |
4509 frontends. */ | |
4510 | |
4511 void | |
4512 c_common_nodes_and_builtins (void) | |
4513 { | |
4514 int char16_type_size; | |
4515 int char32_type_size; | |
4516 int wchar_type_size; | |
4517 tree array_domain_type; | |
4518 tree va_list_ref_type_node; | |
4519 tree va_list_arg_type_node; | |
4520 | |
4521 /* Define `int' and `char' first so that dbx will output them first. */ | |
4522 record_builtin_type (RID_INT, NULL, integer_type_node); | |
4523 record_builtin_type (RID_CHAR, "char", char_type_node); | |
4524 | |
4525 /* `signed' is the same as `int'. FIXME: the declarations of "signed", | |
4526 "unsigned long", "long long unsigned" and "unsigned short" were in C++ | |
4527 but not C. Are the conditionals here needed? */ | |
4528 if (c_dialect_cxx ()) | |
4529 record_builtin_type (RID_SIGNED, NULL, integer_type_node); | |
4530 record_builtin_type (RID_LONG, "long int", long_integer_type_node); | |
4531 record_builtin_type (RID_UNSIGNED, "unsigned int", unsigned_type_node); | |
4532 record_builtin_type (RID_MAX, "long unsigned int", | |
4533 long_unsigned_type_node); | |
4534 if (int128_integer_type_node != NULL_TREE) | |
4535 { | |
4536 record_builtin_type (RID_INT128, "__int128", | |
4537 int128_integer_type_node); | |
4538 record_builtin_type (RID_MAX, "__int128 unsigned", | |
4539 int128_unsigned_type_node); | |
4540 } | |
4541 if (c_dialect_cxx ()) | |
4542 record_builtin_type (RID_MAX, "unsigned long", long_unsigned_type_node); | |
4543 record_builtin_type (RID_MAX, "long long int", | |
4544 long_long_integer_type_node); | |
4545 record_builtin_type (RID_MAX, "long long unsigned int", | |
4546 long_long_unsigned_type_node); | |
4547 if (c_dialect_cxx ()) | |
4548 record_builtin_type (RID_MAX, "long long unsigned", | |
4549 long_long_unsigned_type_node); | |
4550 record_builtin_type (RID_SHORT, "short int", short_integer_type_node); | |
4551 record_builtin_type (RID_MAX, "short unsigned int", | |
4552 short_unsigned_type_node); | |
4553 if (c_dialect_cxx ()) | |
4554 record_builtin_type (RID_MAX, "unsigned short", | |
4555 short_unsigned_type_node); | |
4556 | |
4557 /* Define both `signed char' and `unsigned char'. */ | |
4558 record_builtin_type (RID_MAX, "signed char", signed_char_type_node); | |
4559 record_builtin_type (RID_MAX, "unsigned char", unsigned_char_type_node); | |
4560 | |
4561 /* These are types that c_common_type_for_size and | |
4562 c_common_type_for_mode use. */ | |
4563 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4564 TYPE_DECL, NULL_TREE, | |
4565 intQI_type_node)); | |
4566 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4567 TYPE_DECL, NULL_TREE, | |
4568 intHI_type_node)); | |
4569 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4570 TYPE_DECL, NULL_TREE, | |
4571 intSI_type_node)); | |
4572 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4573 TYPE_DECL, NULL_TREE, | |
4574 intDI_type_node)); | |
4575 #if HOST_BITS_PER_WIDE_INT >= 64 | |
4576 if (targetm.scalar_mode_supported_p (TImode)) | |
4577 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4578 TYPE_DECL, | |
4579 get_identifier ("__int128_t"), | |
4580 intTI_type_node)); | |
4581 #endif | |
4582 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4583 TYPE_DECL, NULL_TREE, | |
4584 unsigned_intQI_type_node)); | |
4585 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4586 TYPE_DECL, NULL_TREE, | |
4587 unsigned_intHI_type_node)); | |
4588 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4589 TYPE_DECL, NULL_TREE, | |
4590 unsigned_intSI_type_node)); | |
4591 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4592 TYPE_DECL, NULL_TREE, | |
4593 unsigned_intDI_type_node)); | |
4594 #if HOST_BITS_PER_WIDE_INT >= 64 | |
4595 if (targetm.scalar_mode_supported_p (TImode)) | |
4596 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4597 TYPE_DECL, | |
4598 get_identifier ("__uint128_t"), | |
4599 unsigned_intTI_type_node)); | |
4600 #endif | |
4601 | |
4602 /* Create the widest literal types. */ | |
4603 widest_integer_literal_type_node | |
4604 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2); | |
4605 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4606 TYPE_DECL, NULL_TREE, | |
4607 widest_integer_literal_type_node)); | |
4608 | |
4609 widest_unsigned_literal_type_node | |
4610 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2); | |
4611 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4612 TYPE_DECL, NULL_TREE, | |
4613 widest_unsigned_literal_type_node)); | |
4614 | |
4615 /* `unsigned long' is the standard type for sizeof. | |
4616 Note that stddef.h uses `unsigned long', | |
4617 and this must agree, even if long and int are the same size. */ | |
4618 size_type_node = | |
4619 TREE_TYPE (identifier_global_value (get_identifier (SIZE_TYPE))); | |
4620 signed_size_type_node = c_common_signed_type (size_type_node); | |
4621 set_sizetype (size_type_node); | |
4622 | |
4623 pid_type_node = | |
4624 TREE_TYPE (identifier_global_value (get_identifier (PID_TYPE))); | |
4625 | |
4626 build_common_tree_nodes_2 (flag_short_double); | |
4627 | |
4628 record_builtin_type (RID_FLOAT, NULL, float_type_node); | |
4629 record_builtin_type (RID_DOUBLE, NULL, double_type_node); | |
4630 record_builtin_type (RID_MAX, "long double", long_double_type_node); | |
4631 | |
4632 /* Only supported decimal floating point extension if the target | |
4633 actually supports underlying modes. */ | |
4634 if (targetm.scalar_mode_supported_p (SDmode) | |
4635 && targetm.scalar_mode_supported_p (DDmode) | |
4636 && targetm.scalar_mode_supported_p (TDmode)) | |
4637 { | |
4638 record_builtin_type (RID_DFLOAT32, NULL, dfloat32_type_node); | |
4639 record_builtin_type (RID_DFLOAT64, NULL, dfloat64_type_node); | |
4640 record_builtin_type (RID_DFLOAT128, NULL, dfloat128_type_node); | |
4641 } | |
4642 | |
4643 if (targetm.fixed_point_supported_p ()) | |
4644 { | |
4645 record_builtin_type (RID_MAX, "short _Fract", short_fract_type_node); | |
4646 record_builtin_type (RID_FRACT, NULL, fract_type_node); | |
4647 record_builtin_type (RID_MAX, "long _Fract", long_fract_type_node); | |
4648 record_builtin_type (RID_MAX, "long long _Fract", | |
4649 long_long_fract_type_node); | |
4650 record_builtin_type (RID_MAX, "unsigned short _Fract", | |
4651 unsigned_short_fract_type_node); | |
4652 record_builtin_type (RID_MAX, "unsigned _Fract", | |
4653 unsigned_fract_type_node); | |
4654 record_builtin_type (RID_MAX, "unsigned long _Fract", | |
4655 unsigned_long_fract_type_node); | |
4656 record_builtin_type (RID_MAX, "unsigned long long _Fract", | |
4657 unsigned_long_long_fract_type_node); | |
4658 record_builtin_type (RID_MAX, "_Sat short _Fract", | |
4659 sat_short_fract_type_node); | |
4660 record_builtin_type (RID_MAX, "_Sat _Fract", sat_fract_type_node); | |
4661 record_builtin_type (RID_MAX, "_Sat long _Fract", | |
4662 sat_long_fract_type_node); | |
4663 record_builtin_type (RID_MAX, "_Sat long long _Fract", | |
4664 sat_long_long_fract_type_node); | |
4665 record_builtin_type (RID_MAX, "_Sat unsigned short _Fract", | |
4666 sat_unsigned_short_fract_type_node); | |
4667 record_builtin_type (RID_MAX, "_Sat unsigned _Fract", | |
4668 sat_unsigned_fract_type_node); | |
4669 record_builtin_type (RID_MAX, "_Sat unsigned long _Fract", | |
4670 sat_unsigned_long_fract_type_node); | |
4671 record_builtin_type (RID_MAX, "_Sat unsigned long long _Fract", | |
4672 sat_unsigned_long_long_fract_type_node); | |
4673 record_builtin_type (RID_MAX, "short _Accum", short_accum_type_node); | |
4674 record_builtin_type (RID_ACCUM, NULL, accum_type_node); | |
4675 record_builtin_type (RID_MAX, "long _Accum", long_accum_type_node); | |
4676 record_builtin_type (RID_MAX, "long long _Accum", | |
4677 long_long_accum_type_node); | |
4678 record_builtin_type (RID_MAX, "unsigned short _Accum", | |
4679 unsigned_short_accum_type_node); | |
4680 record_builtin_type (RID_MAX, "unsigned _Accum", | |
4681 unsigned_accum_type_node); | |
4682 record_builtin_type (RID_MAX, "unsigned long _Accum", | |
4683 unsigned_long_accum_type_node); | |
4684 record_builtin_type (RID_MAX, "unsigned long long _Accum", | |
4685 unsigned_long_long_accum_type_node); | |
4686 record_builtin_type (RID_MAX, "_Sat short _Accum", | |
4687 sat_short_accum_type_node); | |
4688 record_builtin_type (RID_MAX, "_Sat _Accum", sat_accum_type_node); | |
4689 record_builtin_type (RID_MAX, "_Sat long _Accum", | |
4690 sat_long_accum_type_node); | |
4691 record_builtin_type (RID_MAX, "_Sat long long _Accum", | |
4692 sat_long_long_accum_type_node); | |
4693 record_builtin_type (RID_MAX, "_Sat unsigned short _Accum", | |
4694 sat_unsigned_short_accum_type_node); | |
4695 record_builtin_type (RID_MAX, "_Sat unsigned _Accum", | |
4696 sat_unsigned_accum_type_node); | |
4697 record_builtin_type (RID_MAX, "_Sat unsigned long _Accum", | |
4698 sat_unsigned_long_accum_type_node); | |
4699 record_builtin_type (RID_MAX, "_Sat unsigned long long _Accum", | |
4700 sat_unsigned_long_long_accum_type_node); | |
4701 | |
4702 } | |
4703 | |
4704 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4705 TYPE_DECL, | |
4706 get_identifier ("complex int"), | |
4707 complex_integer_type_node)); | |
4708 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4709 TYPE_DECL, | |
4710 get_identifier ("complex float"), | |
4711 complex_float_type_node)); | |
4712 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION, | |
4713 TYPE_DECL, | |
4714 get_identifier ("complex double"), | |
4715 complex_double_type_node)); | |
4716 lang_hooks.decls.pushdecl | |
4717 (build_decl (UNKNOWN_LOCATION, | |
4718 TYPE_DECL, get_identifier ("complex long double"), | |
4719 complex_long_double_type_node)); | |
4720 | |
4721 if (c_dialect_cxx ()) | |
4722 /* For C++, make fileptr_type_node a distinct void * type until | |
4723 FILE type is defined. */ | |
4724 fileptr_type_node = build_variant_type_copy (ptr_type_node); | |
4725 | |
4726 record_builtin_type (RID_VOID, NULL, void_type_node); | |
4727 | |
4728 /* Set the TYPE_NAME for any variants that were built before | |
4729 record_builtin_type gave names to the built-in types. */ | |
4730 { | |
4731 tree void_name = TYPE_NAME (void_type_node); | |
4732 TYPE_NAME (void_type_node) = NULL_TREE; | |
4733 TYPE_NAME (build_qualified_type (void_type_node, TYPE_QUAL_CONST)) | |
4734 = void_name; | |
4735 TYPE_NAME (void_type_node) = void_name; | |
4736 } | |
4737 | |
4738 /* This node must not be shared. */ | |
4739 void_zero_node = make_node (INTEGER_CST); | |
4740 TREE_TYPE (void_zero_node) = void_type_node; | |
4741 | |
4742 void_list_node = build_void_list_node (); | |
4743 | |
4744 /* Make a type to be the domain of a few array types | |
4745 whose domains don't really matter. | |
4746 200 is small enough that it always fits in size_t | |
4747 and large enough that it can hold most function names for the | |
4748 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */ | |
4749 array_domain_type = build_index_type (size_int (200)); | |
4750 | |
4751 /* Make a type for arrays of characters. | |
4752 With luck nothing will ever really depend on the length of this | |
4753 array type. */ | |
4754 char_array_type_node | |
4755 = build_array_type (char_type_node, array_domain_type); | |
4756 | |
4757 /* Likewise for arrays of ints. */ | |
4758 int_array_type_node | |
4759 = build_array_type (integer_type_node, array_domain_type); | |
4760 | |
4761 string_type_node = build_pointer_type (char_type_node); | |
4762 const_string_type_node | |
4763 = build_pointer_type (build_qualified_type | |
4764 (char_type_node, TYPE_QUAL_CONST)); | |
4765 | |
4766 /* This is special for C++ so functions can be overloaded. */ | |
4767 wchar_type_node = get_identifier (MODIFIED_WCHAR_TYPE); | |
4768 wchar_type_node = TREE_TYPE (identifier_global_value (wchar_type_node)); | |
4769 wchar_type_size = TYPE_PRECISION (wchar_type_node); | |
4770 underlying_wchar_type_node = wchar_type_node; | |
4771 if (c_dialect_cxx ()) | |
4772 { | |
4773 if (TYPE_UNSIGNED (wchar_type_node)) | |
4774 wchar_type_node = make_unsigned_type (wchar_type_size); | |
4775 else | |
4776 wchar_type_node = make_signed_type (wchar_type_size); | |
4777 record_builtin_type (RID_WCHAR, "wchar_t", wchar_type_node); | |
4778 } | |
4779 | |
4780 /* This is for wide string constants. */ | |
4781 wchar_array_type_node | |
4782 = build_array_type (wchar_type_node, array_domain_type); | |
4783 | |
4784 /* Define 'char16_t'. */ | |
4785 char16_type_node = get_identifier (CHAR16_TYPE); | |
4786 char16_type_node = TREE_TYPE (identifier_global_value (char16_type_node)); | |
4787 char16_type_size = TYPE_PRECISION (char16_type_node); | |
4788 if (c_dialect_cxx ()) | |
4789 { | |
4790 char16_type_node = make_unsigned_type (char16_type_size); | |
4791 | |
4792 if (cxx_dialect == cxx0x) | |
4793 record_builtin_type (RID_CHAR16, "char16_t", char16_type_node); | |
4794 } | |
4795 | |
4796 /* This is for UTF-16 string constants. */ | |
4797 char16_array_type_node | |
4798 = build_array_type (char16_type_node, array_domain_type); | |
4799 | |
4800 /* Define 'char32_t'. */ | |
4801 char32_type_node = get_identifier (CHAR32_TYPE); | |
4802 char32_type_node = TREE_TYPE (identifier_global_value (char32_type_node)); | |
4803 char32_type_size = TYPE_PRECISION (char32_type_node); | |
4804 if (c_dialect_cxx ()) | |
4805 { | |
4806 char32_type_node = make_unsigned_type (char32_type_size); | |
4807 | |
4808 if (cxx_dialect == cxx0x) | |
4809 record_builtin_type (RID_CHAR32, "char32_t", char32_type_node); | |
4810 } | |
4811 | |
4812 /* This is for UTF-32 string constants. */ | |
4813 char32_array_type_node | |
4814 = build_array_type (char32_type_node, array_domain_type); | |
4815 | |
4816 wint_type_node = | |
4817 TREE_TYPE (identifier_global_value (get_identifier (WINT_TYPE))); | |
4818 | |
4819 intmax_type_node = | |
4820 TREE_TYPE (identifier_global_value (get_identifier (INTMAX_TYPE))); | |
4821 uintmax_type_node = | |
4822 TREE_TYPE (identifier_global_value (get_identifier (UINTMAX_TYPE))); | |
4823 | |
4824 if (SIG_ATOMIC_TYPE) | |
4825 sig_atomic_type_node = | |
4826 TREE_TYPE (identifier_global_value (c_get_ident (SIG_ATOMIC_TYPE))); | |
4827 if (INT8_TYPE) | |
4828 int8_type_node = | |
4829 TREE_TYPE (identifier_global_value (c_get_ident (INT8_TYPE))); | |
4830 if (INT16_TYPE) | |
4831 int16_type_node = | |
4832 TREE_TYPE (identifier_global_value (c_get_ident (INT16_TYPE))); | |
4833 if (INT32_TYPE) | |
4834 int32_type_node = | |
4835 TREE_TYPE (identifier_global_value (c_get_ident (INT32_TYPE))); | |
4836 if (INT64_TYPE) | |
4837 int64_type_node = | |
4838 TREE_TYPE (identifier_global_value (c_get_ident (INT64_TYPE))); | |
4839 if (UINT8_TYPE) | |
4840 uint8_type_node = | |
4841 TREE_TYPE (identifier_global_value (c_get_ident (UINT8_TYPE))); | |
4842 if (UINT16_TYPE) | |
4843 uint16_type_node = | |
4844 TREE_TYPE (identifier_global_value (c_get_ident (UINT16_TYPE))); | |
4845 if (UINT32_TYPE) | |
4846 c_uint32_type_node = | |
4847 TREE_TYPE (identifier_global_value (c_get_ident (UINT32_TYPE))); | |
4848 if (UINT64_TYPE) | |
4849 c_uint64_type_node = | |
4850 TREE_TYPE (identifier_global_value (c_get_ident (UINT64_TYPE))); | |
4851 if (INT_LEAST8_TYPE) | |
4852 int_least8_type_node = | |
4853 TREE_TYPE (identifier_global_value (c_get_ident (INT_LEAST8_TYPE))); | |
4854 if (INT_LEAST16_TYPE) | |
4855 int_least16_type_node = | |
4856 TREE_TYPE (identifier_global_value (c_get_ident (INT_LEAST16_TYPE))); | |
4857 if (INT_LEAST32_TYPE) | |
4858 int_least32_type_node = | |
4859 TREE_TYPE (identifier_global_value (c_get_ident (INT_LEAST32_TYPE))); | |
4860 if (INT_LEAST64_TYPE) | |
4861 int_least64_type_node = | |
4862 TREE_TYPE (identifier_global_value (c_get_ident (INT_LEAST64_TYPE))); | |
4863 if (UINT_LEAST8_TYPE) | |
4864 uint_least8_type_node = | |
4865 TREE_TYPE (identifier_global_value (c_get_ident (UINT_LEAST8_TYPE))); | |
4866 if (UINT_LEAST16_TYPE) | |
4867 uint_least16_type_node = | |
4868 TREE_TYPE (identifier_global_value (c_get_ident (UINT_LEAST16_TYPE))); | |
4869 if (UINT_LEAST32_TYPE) | |
4870 uint_least32_type_node = | |
4871 TREE_TYPE (identifier_global_value (c_get_ident (UINT_LEAST32_TYPE))); | |
4872 if (UINT_LEAST64_TYPE) | |
4873 uint_least64_type_node = | |
4874 TREE_TYPE (identifier_global_value (c_get_ident (UINT_LEAST64_TYPE))); | |
4875 if (INT_FAST8_TYPE) | |
4876 int_fast8_type_node = | |
4877 TREE_TYPE (identifier_global_value (c_get_ident (INT_FAST8_TYPE))); | |
4878 if (INT_FAST16_TYPE) | |
4879 int_fast16_type_node = | |
4880 TREE_TYPE (identifier_global_value (c_get_ident (INT_FAST16_TYPE))); | |
4881 if (INT_FAST32_TYPE) | |
4882 int_fast32_type_node = | |
4883 TREE_TYPE (identifier_global_value (c_get_ident (INT_FAST32_TYPE))); | |
4884 if (INT_FAST64_TYPE) | |
4885 int_fast64_type_node = | |
4886 TREE_TYPE (identifier_global_value (c_get_ident (INT_FAST64_TYPE))); | |
4887 if (UINT_FAST8_TYPE) | |
4888 uint_fast8_type_node = | |
4889 TREE_TYPE (identifier_global_value (c_get_ident (UINT_FAST8_TYPE))); | |
4890 if (UINT_FAST16_TYPE) | |
4891 uint_fast16_type_node = | |
4892 TREE_TYPE (identifier_global_value (c_get_ident (UINT_FAST16_TYPE))); | |
4893 if (UINT_FAST32_TYPE) | |
4894 uint_fast32_type_node = | |
4895 TREE_TYPE (identifier_global_value (c_get_ident (UINT_FAST32_TYPE))); | |
4896 if (UINT_FAST64_TYPE) | |
4897 uint_fast64_type_node = | |
4898 TREE_TYPE (identifier_global_value (c_get_ident (UINT_FAST64_TYPE))); | |
4899 if (INTPTR_TYPE) | |
4900 intptr_type_node = | |
4901 TREE_TYPE (identifier_global_value (c_get_ident (INTPTR_TYPE))); | |
4902 if (UINTPTR_TYPE) | |
4903 uintptr_type_node = | |
4904 TREE_TYPE (identifier_global_value (c_get_ident (UINTPTR_TYPE))); | |
4905 | |
4906 default_function_type = build_function_type (integer_type_node, NULL_TREE); | |
4907 ptrdiff_type_node | |
4908 = TREE_TYPE (identifier_global_value (get_identifier (PTRDIFF_TYPE))); | |
4909 unsigned_ptrdiff_type_node = c_common_unsigned_type (ptrdiff_type_node); | |
4910 | |
4911 lang_hooks.decls.pushdecl | |
4912 (build_decl (UNKNOWN_LOCATION, | |
4913 TYPE_DECL, get_identifier ("__builtin_va_list"), | |
4914 va_list_type_node)); | |
4915 if (targetm.enum_va_list_p) | |
4916 { | |
4917 int l; | |
4918 const char *pname; | |
4919 tree ptype; | |
4920 | |
4921 for (l = 0; targetm.enum_va_list_p (l, &pname, &ptype); ++l) | |
4922 { | |
4923 lang_hooks.decls.pushdecl | |
4924 (build_decl (UNKNOWN_LOCATION, | |
4925 TYPE_DECL, get_identifier (pname), | |
4926 ptype)); | |
4927 | |
4928 } | |
4929 } | |
4930 | |
4931 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE) | |
4932 { | |
4933 va_list_arg_type_node = va_list_ref_type_node = | |
4934 build_pointer_type (TREE_TYPE (va_list_type_node)); | |
4935 } | |
4936 else | |
4937 { | |
4938 va_list_arg_type_node = va_list_type_node; | |
4939 va_list_ref_type_node = build_reference_type (va_list_type_node); | |
4940 } | |
4941 | |
4942 if (!flag_preprocess_only) | |
4943 c_define_builtins (va_list_ref_type_node, va_list_arg_type_node); | |
4944 | |
4945 main_identifier_node = get_identifier ("main"); | |
4946 | |
4947 /* Create the built-in __null node. It is important that this is | |
4948 not shared. */ | |
4949 null_node = make_node (INTEGER_CST); | |
4950 TREE_TYPE (null_node) = c_common_type_for_size (POINTER_SIZE, 0); | |
4951 | |
4952 /* Since builtin_types isn't gc'ed, don't export these nodes. */ | |
4953 memset (builtin_types, 0, sizeof (builtin_types)); | |
4954 } | |
4955 | |
4956 /* The number of named compound-literals generated thus far. */ | |
4957 static GTY(()) int compound_literal_number; | |
4958 | |
4959 /* Set DECL_NAME for DECL, a VAR_DECL for a compound-literal. */ | |
4960 | |
4961 void | |
4962 set_compound_literal_name (tree decl) | |
4963 { | |
4964 char *name; | |
4965 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal", | |
4966 compound_literal_number); | |
4967 compound_literal_number++; | |
4968 DECL_NAME (decl) = get_identifier (name); | |
4969 } | |
4970 | |
4971 tree | |
4972 build_va_arg (location_t loc, tree expr, tree type) | |
4973 { | |
4974 expr = build1 (VA_ARG_EXPR, type, expr); | |
4975 SET_EXPR_LOCATION (expr, loc); | |
4976 return expr; | |
4977 } | |
4978 | |
4979 | |
4980 /* Linked list of disabled built-in functions. */ | |
4981 | |
4982 typedef struct disabled_builtin | |
4983 { | |
4984 const char *name; | |
4985 struct disabled_builtin *next; | |
4986 } disabled_builtin; | |
4987 static disabled_builtin *disabled_builtins = NULL; | |
4988 | |
4989 static bool builtin_function_disabled_p (const char *); | |
4990 | |
4991 /* Disable a built-in function specified by -fno-builtin-NAME. If NAME | |
4992 begins with "__builtin_", give an error. */ | |
4993 | |
4994 void | |
4995 disable_builtin_function (const char *name) | |
4996 { | |
4997 if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0) | |
4998 error ("cannot disable built-in function %qs", name); | |
4999 else | |
5000 { | |
5001 disabled_builtin *new_disabled_builtin = XNEW (disabled_builtin); | |
5002 new_disabled_builtin->name = name; | |
5003 new_disabled_builtin->next = disabled_builtins; | |
5004 disabled_builtins = new_disabled_builtin; | |
5005 } | |
5006 } | |
5007 | |
5008 | |
5009 /* Return true if the built-in function NAME has been disabled, false | |
5010 otherwise. */ | |
5011 | |
5012 static bool | |
5013 builtin_function_disabled_p (const char *name) | |
5014 { | |
5015 disabled_builtin *p; | |
5016 for (p = disabled_builtins; p != NULL; p = p->next) | |
5017 { | |
5018 if (strcmp (name, p->name) == 0) | |
5019 return true; | |
5020 } | |
5021 return false; | |
5022 } | |
5023 | |
5024 | |
5025 /* Worker for DEF_BUILTIN. | |
5026 Possibly define a builtin function with one or two names. | |
5027 Does not declare a non-__builtin_ function if flag_no_builtin, or if | |
5028 nonansi_p and flag_no_nonansi_builtin. */ | |
5029 | |
5030 static void | |
5031 def_builtin_1 (enum built_in_function fncode, | |
5032 const char *name, | |
5033 enum built_in_class fnclass, | |
5034 tree fntype, tree libtype, | |
5035 bool both_p, bool fallback_p, bool nonansi_p, | |
5036 tree fnattrs, bool implicit_p) | |
5037 { | |
5038 tree decl; | |
5039 const char *libname; | |
5040 | |
5041 if (fntype == error_mark_node) | |
5042 return; | |
5043 | |
5044 gcc_assert ((!both_p && !fallback_p) | |
5045 || !strncmp (name, "__builtin_", | |
5046 strlen ("__builtin_"))); | |
5047 | |
5048 libname = name + strlen ("__builtin_"); | |
5049 decl = add_builtin_function (name, fntype, fncode, fnclass, | |
5050 (fallback_p ? libname : NULL), | |
5051 fnattrs); | |
5052 if (both_p | |
5053 && !flag_no_builtin && !builtin_function_disabled_p (libname) | |
5054 && !(nonansi_p && flag_no_nonansi_builtin)) | |
5055 add_builtin_function (libname, libtype, fncode, fnclass, | |
5056 NULL, fnattrs); | |
5057 | |
5058 built_in_decls[(int) fncode] = decl; | |
5059 if (implicit_p) | |
5060 implicit_built_in_decls[(int) fncode] = decl; | |
5061 } | |
5062 | |
5063 /* Nonzero if the type T promotes to int. This is (nearly) the | |
5064 integral promotions defined in ISO C99 6.3.1.1/2. */ | |
5065 | |
5066 bool | |
5067 c_promoting_integer_type_p (const_tree t) | |
5068 { | |
5069 switch (TREE_CODE (t)) | |
5070 { | |
5071 case INTEGER_TYPE: | |
5072 return (TYPE_MAIN_VARIANT (t) == char_type_node | |
5073 || TYPE_MAIN_VARIANT (t) == signed_char_type_node | |
5074 || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node | |
5075 || TYPE_MAIN_VARIANT (t) == short_integer_type_node | |
5076 || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node | |
5077 || TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node)); | |
5078 | |
5079 case ENUMERAL_TYPE: | |
5080 /* ??? Technically all enumerations not larger than an int | |
5081 promote to an int. But this is used along code paths | |
5082 that only want to notice a size change. */ | |
5083 return TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node); | |
5084 | |
5085 case BOOLEAN_TYPE: | |
5086 return 1; | |
5087 | |
5088 default: | |
5089 return 0; | |
5090 } | |
5091 } | |
5092 | |
5093 /* Return 1 if PARMS specifies a fixed number of parameters | |
5094 and none of their types is affected by default promotions. */ | |
5095 | |
5096 int | |
5097 self_promoting_args_p (const_tree parms) | |
5098 { | |
5099 const_tree t; | |
5100 for (t = parms; t; t = TREE_CHAIN (t)) | |
5101 { | |
5102 tree type = TREE_VALUE (t); | |
5103 | |
5104 if (type == error_mark_node) | |
5105 continue; | |
5106 | |
5107 if (TREE_CHAIN (t) == 0 && type != void_type_node) | |
5108 return 0; | |
5109 | |
5110 if (type == 0) | |
5111 return 0; | |
5112 | |
5113 if (TYPE_MAIN_VARIANT (type) == float_type_node) | |
5114 return 0; | |
5115 | |
5116 if (c_promoting_integer_type_p (type)) | |
5117 return 0; | |
5118 } | |
5119 return 1; | |
5120 } | |
5121 | |
5122 /* Recursively remove any '*' or '&' operator from TYPE. */ | |
5123 tree | |
5124 strip_pointer_operator (tree t) | |
5125 { | |
5126 while (POINTER_TYPE_P (t)) | |
5127 t = TREE_TYPE (t); | |
5128 return t; | |
5129 } | |
5130 | |
5131 /* Recursively remove pointer or array type from TYPE. */ | |
5132 tree | |
5133 strip_pointer_or_array_types (tree t) | |
5134 { | |
5135 while (TREE_CODE (t) == ARRAY_TYPE || POINTER_TYPE_P (t)) | |
5136 t = TREE_TYPE (t); | |
5137 return t; | |
5138 } | |
5139 | |
5140 /* Used to compare case labels. K1 and K2 are actually tree nodes | |
5141 representing case labels, or NULL_TREE for a `default' label. | |
5142 Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after | |
5143 K2, and 0 if K1 and K2 are equal. */ | |
5144 | |
5145 int | |
5146 case_compare (splay_tree_key k1, splay_tree_key k2) | |
5147 { | |
5148 /* Consider a NULL key (such as arises with a `default' label) to be | |
5149 smaller than anything else. */ | |
5150 if (!k1) | |
5151 return k2 ? -1 : 0; | |
5152 else if (!k2) | |
5153 return k1 ? 1 : 0; | |
5154 | |
5155 return tree_int_cst_compare ((tree) k1, (tree) k2); | |
5156 } | |
5157 | |
5158 /* Process a case label, located at LOC, for the range LOW_VALUE | |
5159 ... HIGH_VALUE. If LOW_VALUE and HIGH_VALUE are both NULL_TREE | |
5160 then this case label is actually a `default' label. If only | |
5161 HIGH_VALUE is NULL_TREE, then case label was declared using the | |
5162 usual C/C++ syntax, rather than the GNU case range extension. | |
5163 CASES is a tree containing all the case ranges processed so far; | |
5164 COND is the condition for the switch-statement itself. Returns the | |
5165 CASE_LABEL_EXPR created, or ERROR_MARK_NODE if no CASE_LABEL_EXPR | |
5166 is created. */ | |
5167 | |
5168 tree | |
5169 c_add_case_label (location_t loc, splay_tree cases, tree cond, tree orig_type, | |
5170 tree low_value, tree high_value) | |
5171 { | |
5172 tree type; | |
5173 tree label; | |
5174 tree case_label; | |
5175 splay_tree_node node; | |
5176 | |
5177 /* Create the LABEL_DECL itself. */ | |
5178 label = create_artificial_label (loc); | |
5179 | |
5180 /* If there was an error processing the switch condition, bail now | |
5181 before we get more confused. */ | |
5182 if (!cond || cond == error_mark_node) | |
5183 goto error_out; | |
5184 | |
5185 if ((low_value && TREE_TYPE (low_value) | |
5186 && POINTER_TYPE_P (TREE_TYPE (low_value))) | |
5187 || (high_value && TREE_TYPE (high_value) | |
5188 && POINTER_TYPE_P (TREE_TYPE (high_value)))) | |
5189 { | |
5190 error_at (loc, "pointers are not permitted as case values"); | |
5191 goto error_out; | |
5192 } | |
5193 | |
5194 /* Case ranges are a GNU extension. */ | |
5195 if (high_value) | |
5196 pedwarn (loc, OPT_pedantic, | |
5197 "range expressions in switch statements are non-standard"); | |
5198 | |
5199 type = TREE_TYPE (cond); | |
5200 if (low_value) | |
5201 { | |
5202 low_value = check_case_value (low_value); | |
5203 low_value = convert_and_check (type, low_value); | |
5204 if (low_value == error_mark_node) | |
5205 goto error_out; | |
5206 } | |
5207 if (high_value) | |
5208 { | |
5209 high_value = check_case_value (high_value); | |
5210 high_value = convert_and_check (type, high_value); | |
5211 if (high_value == error_mark_node) | |
5212 goto error_out; | |
5213 } | |
5214 | |
5215 if (low_value && high_value) | |
5216 { | |
5217 /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't | |
5218 really a case range, even though it was written that way. | |
5219 Remove the HIGH_VALUE to simplify later processing. */ | |
5220 if (tree_int_cst_equal (low_value, high_value)) | |
5221 high_value = NULL_TREE; | |
5222 else if (!tree_int_cst_lt (low_value, high_value)) | |
5223 warning_at (loc, 0, "empty range specified"); | |
5224 } | |
5225 | |
5226 /* See if the case is in range of the type of the original testing | |
5227 expression. If both low_value and high_value are out of range, | |
5228 don't insert the case label and return NULL_TREE. */ | |
5229 if (low_value | |
5230 && !check_case_bounds (type, orig_type, | |
5231 &low_value, high_value ? &high_value : NULL)) | |
5232 return NULL_TREE; | |
5233 | |
5234 /* Look up the LOW_VALUE in the table of case labels we already | |
5235 have. */ | |
5236 node = splay_tree_lookup (cases, (splay_tree_key) low_value); | |
5237 /* If there was not an exact match, check for overlapping ranges. | |
5238 There's no need to do this if there's no LOW_VALUE or HIGH_VALUE; | |
5239 that's a `default' label and the only overlap is an exact match. */ | |
5240 if (!node && (low_value || high_value)) | |
5241 { | |
5242 splay_tree_node low_bound; | |
5243 splay_tree_node high_bound; | |
5244 | |
5245 /* Even though there wasn't an exact match, there might be an | |
5246 overlap between this case range and another case range. | |
5247 Since we've (inductively) not allowed any overlapping case | |
5248 ranges, we simply need to find the greatest low case label | |
5249 that is smaller that LOW_VALUE, and the smallest low case | |
5250 label that is greater than LOW_VALUE. If there is an overlap | |
5251 it will occur in one of these two ranges. */ | |
5252 low_bound = splay_tree_predecessor (cases, | |
5253 (splay_tree_key) low_value); | |
5254 high_bound = splay_tree_successor (cases, | |
5255 (splay_tree_key) low_value); | |
5256 | |
5257 /* Check to see if the LOW_BOUND overlaps. It is smaller than | |
5258 the LOW_VALUE, so there is no need to check unless the | |
5259 LOW_BOUND is in fact itself a case range. */ | |
5260 if (low_bound | |
5261 && CASE_HIGH ((tree) low_bound->value) | |
5262 && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value), | |
5263 low_value) >= 0) | |
5264 node = low_bound; | |
5265 /* Check to see if the HIGH_BOUND overlaps. The low end of that | |
5266 range is bigger than the low end of the current range, so we | |
5267 are only interested if the current range is a real range, and | |
5268 not an ordinary case label. */ | |
5269 else if (high_bound | |
5270 && high_value | |
5271 && (tree_int_cst_compare ((tree) high_bound->key, | |
5272 high_value) | |
5273 <= 0)) | |
5274 node = high_bound; | |
5275 } | |
5276 /* If there was an overlap, issue an error. */ | |
5277 if (node) | |
5278 { | |
5279 tree duplicate = CASE_LABEL ((tree) node->value); | |
5280 | |
5281 if (high_value) | |
5282 { | |
5283 error_at (loc, "duplicate (or overlapping) case value"); | |
5284 error_at (DECL_SOURCE_LOCATION (duplicate), | |
5285 "this is the first entry overlapping that value"); | |
5286 } | |
5287 else if (low_value) | |
5288 { | |
5289 error_at (loc, "duplicate case value") ; | |
5290 error_at (DECL_SOURCE_LOCATION (duplicate), "previously used here"); | |
5291 } | |
5292 else | |
5293 { | |
5294 error_at (loc, "multiple default labels in one switch"); | |
5295 error_at (DECL_SOURCE_LOCATION (duplicate), | |
5296 "this is the first default label"); | |
5297 } | |
5298 goto error_out; | |
5299 } | |
5300 | |
5301 /* Add a CASE_LABEL to the statement-tree. */ | |
5302 case_label = add_stmt (build_case_label (loc, low_value, high_value, label)); | |
5303 /* Register this case label in the splay tree. */ | |
5304 splay_tree_insert (cases, | |
5305 (splay_tree_key) low_value, | |
5306 (splay_tree_value) case_label); | |
5307 | |
5308 return case_label; | |
5309 | |
5310 error_out: | |
5311 /* Add a label so that the back-end doesn't think that the beginning of | |
5312 the switch is unreachable. Note that we do not add a case label, as | |
5313 that just leads to duplicates and thence to failure later on. */ | |
5314 if (!cases->root) | |
5315 { | |
5316 tree t = create_artificial_label (loc); | |
5317 add_stmt (build_stmt (loc, LABEL_EXPR, t)); | |
5318 } | |
5319 return error_mark_node; | |
5320 } | |
5321 | |
5322 /* Subroutines of c_do_switch_warnings, called via splay_tree_foreach. | |
5323 Used to verify that case values match up with enumerator values. */ | |
5324 | |
5325 static void | |
5326 match_case_to_enum_1 (tree key, tree type, tree label) | |
5327 { | |
5328 char buf[2 + 2*HOST_BITS_PER_WIDE_INT/4 + 1]; | |
5329 | |
5330 /* ??? Not working too hard to print the double-word value. | |
5331 Should perhaps be done with %lwd in the diagnostic routines? */ | |
5332 if (TREE_INT_CST_HIGH (key) == 0) | |
5333 snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_UNSIGNED, | |
5334 TREE_INT_CST_LOW (key)); | |
5335 else if (!TYPE_UNSIGNED (type) | |
5336 && TREE_INT_CST_HIGH (key) == -1 | |
5337 && TREE_INT_CST_LOW (key) != 0) | |
5338 snprintf (buf, sizeof (buf), "-" HOST_WIDE_INT_PRINT_UNSIGNED, | |
5339 -TREE_INT_CST_LOW (key)); | |
5340 else | |
5341 snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_DOUBLE_HEX, | |
5342 (unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (key), | |
5343 (unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (key)); | |
5344 | |
5345 if (TYPE_NAME (type) == 0) | |
5346 warning_at (DECL_SOURCE_LOCATION (CASE_LABEL (label)), | |
5347 warn_switch ? OPT_Wswitch : OPT_Wswitch_enum, | |
5348 "case value %qs not in enumerated type", | |
5349 buf); | |
5350 else | |
5351 warning_at (DECL_SOURCE_LOCATION (CASE_LABEL (label)), | |
5352 warn_switch ? OPT_Wswitch : OPT_Wswitch_enum, | |
5353 "case value %qs not in enumerated type %qT", | |
5354 buf, type); | |
5355 } | |
5356 | |
5357 /* Subroutine of c_do_switch_warnings, called via splay_tree_foreach. | |
5358 Used to verify that case values match up with enumerator values. */ | |
5359 | |
5360 static int | |
5361 match_case_to_enum (splay_tree_node node, void *data) | |
5362 { | |
5363 tree label = (tree) node->value; | |
5364 tree type = (tree) data; | |
5365 | |
5366 /* Skip default case. */ | |
5367 if (!CASE_LOW (label)) | |
5368 return 0; | |
5369 | |
5370 /* If CASE_LOW_SEEN is not set, that means CASE_LOW did not appear | |
5371 when we did our enum->case scan. Reset our scratch bit after. */ | |
5372 if (!CASE_LOW_SEEN (label)) | |
5373 match_case_to_enum_1 (CASE_LOW (label), type, label); | |
5374 else | |
5375 CASE_LOW_SEEN (label) = 0; | |
5376 | |
5377 /* If CASE_HIGH is non-null, we have a range. If CASE_HIGH_SEEN is | |
5378 not set, that means that CASE_HIGH did not appear when we did our | |
5379 enum->case scan. Reset our scratch bit after. */ | |
5380 if (CASE_HIGH (label)) | |
5381 { | |
5382 if (!CASE_HIGH_SEEN (label)) | |
5383 match_case_to_enum_1 (CASE_HIGH (label), type, label); | |
5384 else | |
5385 CASE_HIGH_SEEN (label) = 0; | |
5386 } | |
5387 | |
5388 return 0; | |
5389 } | |
5390 | |
5391 /* Handle -Wswitch*. Called from the front end after parsing the | |
5392 switch construct. */ | |
5393 /* ??? Should probably be somewhere generic, since other languages | |
5394 besides C and C++ would want this. At the moment, however, C/C++ | |
5395 are the only tree-ssa languages that support enumerations at all, | |
5396 so the point is moot. */ | |
5397 | |
5398 void | |
5399 c_do_switch_warnings (splay_tree cases, location_t switch_location, | |
5400 tree type, tree cond) | |
5401 { | |
5402 splay_tree_node default_node; | |
5403 splay_tree_node node; | |
5404 tree chain; | |
5405 | |
5406 if (!warn_switch && !warn_switch_enum && !warn_switch_default) | |
5407 return; | |
5408 | |
5409 default_node = splay_tree_lookup (cases, (splay_tree_key) NULL); | |
5410 if (!default_node) | |
5411 warning_at (switch_location, OPT_Wswitch_default, | |
5412 "switch missing default case"); | |
5413 | |
5414 /* From here on, we only care about about enumerated types. */ | |
5415 if (!type || TREE_CODE (type) != ENUMERAL_TYPE) | |
5416 return; | |
5417 | |
5418 /* From here on, we only care about -Wswitch and -Wswitch-enum. */ | |
5419 if (!warn_switch_enum && !warn_switch) | |
5420 return; | |
5421 | |
5422 /* Check the cases. Warn about case values which are not members of | |
5423 the enumerated type. For -Wswitch-enum, or for -Wswitch when | |
5424 there is no default case, check that exactly all enumeration | |
5425 literals are covered by the cases. */ | |
5426 | |
5427 /* Clearing COND if it is not an integer constant simplifies | |
5428 the tests inside the loop below. */ | |
5429 if (TREE_CODE (cond) != INTEGER_CST) | |
5430 cond = NULL_TREE; | |
5431 | |
5432 /* The time complexity here is O(N*lg(N)) worst case, but for the | |
5433 common case of monotonically increasing enumerators, it is | |
5434 O(N), since the nature of the splay tree will keep the next | |
5435 element adjacent to the root at all times. */ | |
5436 | |
5437 for (chain = TYPE_VALUES (type); chain; chain = TREE_CHAIN (chain)) | |
5438 { | |
5439 tree value = TREE_VALUE (chain); | |
5440 if (TREE_CODE (value) == CONST_DECL) | |
5441 value = DECL_INITIAL (value); | |
5442 node = splay_tree_lookup (cases, (splay_tree_key) value); | |
5443 if (node) | |
5444 { | |
5445 /* Mark the CASE_LOW part of the case entry as seen. */ | |
5446 tree label = (tree) node->value; | |
5447 CASE_LOW_SEEN (label) = 1; | |
5448 continue; | |
5449 } | |
5450 | |
5451 /* Even though there wasn't an exact match, there might be a | |
5452 case range which includes the enumerator's value. */ | |
5453 node = splay_tree_predecessor (cases, (splay_tree_key) value); | |
5454 if (node && CASE_HIGH ((tree) node->value)) | |
5455 { | |
5456 tree label = (tree) node->value; | |
5457 int cmp = tree_int_cst_compare (CASE_HIGH (label), value); | |
5458 if (cmp >= 0) | |
5459 { | |
5460 /* If we match the upper bound exactly, mark the CASE_HIGH | |
5461 part of the case entry as seen. */ | |
5462 if (cmp == 0) | |
5463 CASE_HIGH_SEEN (label) = 1; | |
5464 continue; | |
5465 } | |
5466 } | |
5467 | |
5468 /* We've now determined that this enumerated literal isn't | |
5469 handled by the case labels of the switch statement. */ | |
5470 | |
5471 /* If the switch expression is a constant, we only really care | |
5472 about whether that constant is handled by the switch. */ | |
5473 if (cond && tree_int_cst_compare (cond, value)) | |
5474 continue; | |
5475 | |
5476 /* If there is a default_node, the only relevant option is | |
5477 Wswitch-enum. Otherwise, if both are enabled then we prefer | |
5478 to warn using -Wswitch because -Wswitch is enabled by -Wall | |
5479 while -Wswitch-enum is explicit. */ | |
5480 warning_at (switch_location, | |
5481 (default_node || !warn_switch | |
5482 ? OPT_Wswitch_enum | |
5483 : OPT_Wswitch), | |
5484 "enumeration value %qE not handled in switch", | |
5485 TREE_PURPOSE (chain)); | |
5486 } | |
5487 | |
5488 /* Warn if there are case expressions that don't correspond to | |
5489 enumerators. This can occur since C and C++ don't enforce | |
5490 type-checking of assignments to enumeration variables. | |
5491 | |
5492 The time complexity here is now always O(N) worst case, since | |
5493 we should have marked both the lower bound and upper bound of | |
5494 every disjoint case label, with CASE_LOW_SEEN and CASE_HIGH_SEEN | |
5495 above. This scan also resets those fields. */ | |
5496 | |
5497 splay_tree_foreach (cases, match_case_to_enum, type); | |
5498 } | |
5499 | |
5500 /* Finish an expression taking the address of LABEL (an | |
5501 IDENTIFIER_NODE). Returns an expression for the address. | |
5502 | |
5503 LOC is the location for the expression returned. */ | |
5504 | |
5505 tree | |
5506 finish_label_address_expr (tree label, location_t loc) | |
5507 { | |
5508 tree result; | |
5509 | |
5510 pedwarn (input_location, OPT_pedantic, "taking the address of a label is non-standard"); | |
5511 | |
5512 if (label == error_mark_node) | |
5513 return error_mark_node; | |
5514 | |
5515 label = lookup_label (label); | |
5516 if (label == NULL_TREE) | |
5517 result = null_pointer_node; | |
5518 else | |
5519 { | |
5520 TREE_USED (label) = 1; | |
5521 result = build1 (ADDR_EXPR, ptr_type_node, label); | |
5522 /* The current function is not necessarily uninlinable. | |
5523 Computed gotos are incompatible with inlining, but the value | |
5524 here could be used only in a diagnostic, for example. */ | |
5525 protected_set_expr_location (result, loc); | |
5526 } | |
5527 | |
5528 return result; | |
5529 } | |
5530 | |
5531 | |
5532 /* Given a boolean expression ARG, return a tree representing an increment | |
5533 or decrement (as indicated by CODE) of ARG. The front end must check for | |
5534 invalid cases (e.g., decrement in C++). */ | |
5535 tree | |
5536 boolean_increment (enum tree_code code, tree arg) | |
5537 { | |
5538 tree val; | |
5539 tree true_res = build_int_cst (TREE_TYPE (arg), 1); | |
5540 | |
5541 arg = stabilize_reference (arg); | |
5542 switch (code) | |
5543 { | |
5544 case PREINCREMENT_EXPR: | |
5545 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res); | |
5546 break; | |
5547 case POSTINCREMENT_EXPR: | |
5548 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res); | |
5549 arg = save_expr (arg); | |
5550 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); | |
5551 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
5552 break; | |
5553 case PREDECREMENT_EXPR: | |
5554 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, | |
5555 invert_truthvalue_loc (input_location, arg)); | |
5556 break; | |
5557 case POSTDECREMENT_EXPR: | |
5558 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, | |
5559 invert_truthvalue_loc (input_location, arg)); | |
5560 arg = save_expr (arg); | |
5561 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg); | |
5562 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val); | |
5563 break; | |
5564 default: | |
5565 gcc_unreachable (); | |
5566 } | |
5567 TREE_SIDE_EFFECTS (val) = 1; | |
5568 return val; | |
5569 } | |
5570 | |
5571 /* Built-in macros for stddef.h and stdint.h, that require macros | |
5572 defined in this file. */ | |
5573 void | |
5574 c_stddef_cpp_builtins(void) | |
5575 { | |
5576 builtin_define_with_value ("__SIZE_TYPE__", SIZE_TYPE, 0); | |
5577 builtin_define_with_value ("__PTRDIFF_TYPE__", PTRDIFF_TYPE, 0); | |
5578 builtin_define_with_value ("__WCHAR_TYPE__", MODIFIED_WCHAR_TYPE, 0); | |
5579 builtin_define_with_value ("__WINT_TYPE__", WINT_TYPE, 0); | |
5580 builtin_define_with_value ("__INTMAX_TYPE__", INTMAX_TYPE, 0); | |
5581 builtin_define_with_value ("__UINTMAX_TYPE__", UINTMAX_TYPE, 0); | |
5582 builtin_define_with_value ("__CHAR16_TYPE__", CHAR16_TYPE, 0); | |
5583 builtin_define_with_value ("__CHAR32_TYPE__", CHAR32_TYPE, 0); | |
5584 if (SIG_ATOMIC_TYPE) | |
5585 builtin_define_with_value ("__SIG_ATOMIC_TYPE__", SIG_ATOMIC_TYPE, 0); | |
5586 if (INT8_TYPE) | |
5587 builtin_define_with_value ("__INT8_TYPE__", INT8_TYPE, 0); | |
5588 if (INT16_TYPE) | |
5589 builtin_define_with_value ("__INT16_TYPE__", INT16_TYPE, 0); | |
5590 if (INT32_TYPE) | |
5591 builtin_define_with_value ("__INT32_TYPE__", INT32_TYPE, 0); | |
5592 if (INT64_TYPE) | |
5593 builtin_define_with_value ("__INT64_TYPE__", INT64_TYPE, 0); | |
5594 if (UINT8_TYPE) | |
5595 builtin_define_with_value ("__UINT8_TYPE__", UINT8_TYPE, 0); | |
5596 if (UINT16_TYPE) | |
5597 builtin_define_with_value ("__UINT16_TYPE__", UINT16_TYPE, 0); | |
5598 if (UINT32_TYPE) | |
5599 builtin_define_with_value ("__UINT32_TYPE__", UINT32_TYPE, 0); | |
5600 if (UINT64_TYPE) | |
5601 builtin_define_with_value ("__UINT64_TYPE__", UINT64_TYPE, 0); | |
5602 if (INT_LEAST8_TYPE) | |
5603 builtin_define_with_value ("__INT_LEAST8_TYPE__", INT_LEAST8_TYPE, 0); | |
5604 if (INT_LEAST16_TYPE) | |
5605 builtin_define_with_value ("__INT_LEAST16_TYPE__", INT_LEAST16_TYPE, 0); | |
5606 if (INT_LEAST32_TYPE) | |
5607 builtin_define_with_value ("__INT_LEAST32_TYPE__", INT_LEAST32_TYPE, 0); | |
5608 if (INT_LEAST64_TYPE) | |
5609 builtin_define_with_value ("__INT_LEAST64_TYPE__", INT_LEAST64_TYPE, 0); | |
5610 if (UINT_LEAST8_TYPE) | |
5611 builtin_define_with_value ("__UINT_LEAST8_TYPE__", UINT_LEAST8_TYPE, 0); | |
5612 if (UINT_LEAST16_TYPE) | |
5613 builtin_define_with_value ("__UINT_LEAST16_TYPE__", UINT_LEAST16_TYPE, 0); | |
5614 if (UINT_LEAST32_TYPE) | |
5615 builtin_define_with_value ("__UINT_LEAST32_TYPE__", UINT_LEAST32_TYPE, 0); | |
5616 if (UINT_LEAST64_TYPE) | |
5617 builtin_define_with_value ("__UINT_LEAST64_TYPE__", UINT_LEAST64_TYPE, 0); | |
5618 if (INT_FAST8_TYPE) | |
5619 builtin_define_with_value ("__INT_FAST8_TYPE__", INT_FAST8_TYPE, 0); | |
5620 if (INT_FAST16_TYPE) | |
5621 builtin_define_with_value ("__INT_FAST16_TYPE__", INT_FAST16_TYPE, 0); | |
5622 if (INT_FAST32_TYPE) | |
5623 builtin_define_with_value ("__INT_FAST32_TYPE__", INT_FAST32_TYPE, 0); | |
5624 if (INT_FAST64_TYPE) | |
5625 builtin_define_with_value ("__INT_FAST64_TYPE__", INT_FAST64_TYPE, 0); | |
5626 if (UINT_FAST8_TYPE) | |
5627 builtin_define_with_value ("__UINT_FAST8_TYPE__", UINT_FAST8_TYPE, 0); | |
5628 if (UINT_FAST16_TYPE) | |
5629 builtin_define_with_value ("__UINT_FAST16_TYPE__", UINT_FAST16_TYPE, 0); | |
5630 if (UINT_FAST32_TYPE) | |
5631 builtin_define_with_value ("__UINT_FAST32_TYPE__", UINT_FAST32_TYPE, 0); | |
5632 if (UINT_FAST64_TYPE) | |
5633 builtin_define_with_value ("__UINT_FAST64_TYPE__", UINT_FAST64_TYPE, 0); | |
5634 if (INTPTR_TYPE) | |
5635 builtin_define_with_value ("__INTPTR_TYPE__", INTPTR_TYPE, 0); | |
5636 if (UINTPTR_TYPE) | |
5637 builtin_define_with_value ("__UINTPTR_TYPE__", UINTPTR_TYPE, 0); | |
5638 } | |
5639 | |
5640 static void | |
5641 c_init_attributes (void) | |
5642 { | |
5643 /* Fill in the built_in_attributes array. */ | |
5644 #define DEF_ATTR_NULL_TREE(ENUM) \ | |
5645 built_in_attributes[(int) ENUM] = NULL_TREE; | |
5646 #define DEF_ATTR_INT(ENUM, VALUE) \ | |
5647 built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE); | |
5648 #define DEF_ATTR_IDENT(ENUM, STRING) \ | |
5649 built_in_attributes[(int) ENUM] = get_identifier (STRING); | |
5650 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \ | |
5651 built_in_attributes[(int) ENUM] \ | |
5652 = tree_cons (built_in_attributes[(int) PURPOSE], \ | |
5653 built_in_attributes[(int) VALUE], \ | |
5654 built_in_attributes[(int) CHAIN]); | |
5655 #include "builtin-attrs.def" | |
5656 #undef DEF_ATTR_NULL_TREE | |
5657 #undef DEF_ATTR_INT | |
5658 #undef DEF_ATTR_IDENT | |
5659 #undef DEF_ATTR_TREE_LIST | |
5660 } | |
5661 | |
5662 /* Returns TRUE iff the attribute indicated by ATTR_ID takes a plain | |
5663 identifier as an argument, so the front end shouldn't look it up. */ | |
5664 | |
5665 bool | |
5666 attribute_takes_identifier_p (const_tree attr_id) | |
5667 { | |
5668 const struct attribute_spec *spec = lookup_attribute_spec (attr_id); | |
5669 if (spec == NULL) | |
5670 /* Unknown attribute that we'll end up ignoring, return true so we | |
5671 don't complain about an identifier argument. */ | |
5672 return true; | |
5673 else if (!strcmp ("mode", spec->name) | |
5674 || !strcmp ("format", spec->name) | |
5675 || !strcmp ("cleanup", spec->name)) | |
5676 return true; | |
5677 else | |
5678 return targetm.attribute_takes_identifier_p (attr_id); | |
5679 } | |
5680 | |
5681 /* Attribute handlers common to C front ends. */ | |
5682 | |
5683 /* Handle a "packed" attribute; arguments as in | |
5684 struct attribute_spec.handler. */ | |
5685 | |
5686 static tree | |
5687 handle_packed_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5688 int flags, bool *no_add_attrs) | |
5689 { | |
5690 if (TYPE_P (*node)) | |
5691 { | |
5692 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
5693 *node = build_variant_type_copy (*node); | |
5694 TYPE_PACKED (*node) = 1; | |
5695 } | |
5696 else if (TREE_CODE (*node) == FIELD_DECL) | |
5697 { | |
5698 if (TYPE_ALIGN (TREE_TYPE (*node)) <= BITS_PER_UNIT | |
5699 /* Still pack bitfields. */ | |
5700 && ! DECL_INITIAL (*node)) | |
5701 warning (OPT_Wattributes, | |
5702 "%qE attribute ignored for field of type %qT", | |
5703 name, TREE_TYPE (*node)); | |
5704 else | |
5705 DECL_PACKED (*node) = 1; | |
5706 } | |
5707 /* We can't set DECL_PACKED for a VAR_DECL, because the bit is | |
5708 used for DECL_REGISTER. It wouldn't mean anything anyway. | |
5709 We can't set DECL_PACKED on the type of a TYPE_DECL, because | |
5710 that changes what the typedef is typing. */ | |
5711 else | |
5712 { | |
5713 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5714 *no_add_attrs = true; | |
5715 } | |
5716 | |
5717 return NULL_TREE; | |
5718 } | |
5719 | |
5720 /* Handle a "nocommon" attribute; arguments as in | |
5721 struct attribute_spec.handler. */ | |
5722 | |
5723 static tree | |
5724 handle_nocommon_attribute (tree *node, tree name, | |
5725 tree ARG_UNUSED (args), | |
5726 int ARG_UNUSED (flags), bool *no_add_attrs) | |
5727 { | |
5728 if (TREE_CODE (*node) == VAR_DECL) | |
5729 DECL_COMMON (*node) = 0; | |
5730 else | |
5731 { | |
5732 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5733 *no_add_attrs = true; | |
5734 } | |
5735 | |
5736 return NULL_TREE; | |
5737 } | |
5738 | |
5739 /* Handle a "common" attribute; arguments as in | |
5740 struct attribute_spec.handler. */ | |
5741 | |
5742 static tree | |
5743 handle_common_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5744 int ARG_UNUSED (flags), bool *no_add_attrs) | |
5745 { | |
5746 if (TREE_CODE (*node) == VAR_DECL) | |
5747 DECL_COMMON (*node) = 1; | |
5748 else | |
5749 { | |
5750 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5751 *no_add_attrs = true; | |
5752 } | |
5753 | |
5754 return NULL_TREE; | |
5755 } | |
5756 | |
5757 /* Handle a "noreturn" attribute; arguments as in | |
5758 struct attribute_spec.handler. */ | |
5759 | |
5760 static tree | |
5761 handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5762 int ARG_UNUSED (flags), bool *no_add_attrs) | |
5763 { | |
5764 tree type = TREE_TYPE (*node); | |
5765 | |
5766 /* See FIXME comment in c_common_attribute_table. */ | |
5767 if (TREE_CODE (*node) == FUNCTION_DECL | |
5768 || objc_method_decl (TREE_CODE (*node))) | |
5769 TREE_THIS_VOLATILE (*node) = 1; | |
5770 else if (TREE_CODE (type) == POINTER_TYPE | |
5771 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
5772 TREE_TYPE (*node) | |
5773 = build_pointer_type | |
5774 (build_type_variant (TREE_TYPE (type), | |
5775 TYPE_READONLY (TREE_TYPE (type)), 1)); | |
5776 else | |
5777 { | |
5778 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5779 *no_add_attrs = true; | |
5780 } | |
5781 | |
5782 return NULL_TREE; | |
5783 } | |
5784 | |
5785 /* Handle a "hot" and attribute; arguments as in | |
5786 struct attribute_spec.handler. */ | |
5787 | |
5788 static tree | |
5789 handle_hot_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5790 int ARG_UNUSED (flags), bool *no_add_attrs) | |
5791 { | |
5792 if (TREE_CODE (*node) == FUNCTION_DECL) | |
5793 { | |
5794 if (lookup_attribute ("cold", DECL_ATTRIBUTES (*node)) != NULL) | |
5795 { | |
5796 warning (OPT_Wattributes, "%qE attribute conflicts with attribute %s", | |
5797 name, "cold"); | |
5798 *no_add_attrs = true; | |
5799 } | |
5800 /* Most of the rest of the hot processing is done later with | |
5801 lookup_attribute. */ | |
5802 } | |
5803 else | |
5804 { | |
5805 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5806 *no_add_attrs = true; | |
5807 } | |
5808 | |
5809 return NULL_TREE; | |
5810 } | |
5811 /* Handle a "cold" and attribute; arguments as in | |
5812 struct attribute_spec.handler. */ | |
5813 | |
5814 static tree | |
5815 handle_cold_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5816 int ARG_UNUSED (flags), bool *no_add_attrs) | |
5817 { | |
5818 if (TREE_CODE (*node) == FUNCTION_DECL) | |
5819 { | |
5820 if (lookup_attribute ("hot", DECL_ATTRIBUTES (*node)) != NULL) | |
5821 { | |
5822 warning (OPT_Wattributes, "%qE attribute conflicts with attribute %s", | |
5823 name, "hot"); | |
5824 *no_add_attrs = true; | |
5825 } | |
5826 /* Most of the rest of the cold processing is done later with | |
5827 lookup_attribute. */ | |
5828 } | |
5829 else | |
5830 { | |
5831 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5832 *no_add_attrs = true; | |
5833 } | |
5834 | |
5835 return NULL_TREE; | |
5836 } | |
5837 | |
5838 /* Handle a "noinline" attribute; arguments as in | |
5839 struct attribute_spec.handler. */ | |
5840 | |
5841 static tree | |
5842 handle_noinline_attribute (tree *node, tree name, | |
5843 tree ARG_UNUSED (args), | |
5844 int ARG_UNUSED (flags), bool *no_add_attrs) | |
5845 { | |
5846 if (TREE_CODE (*node) == FUNCTION_DECL) | |
5847 DECL_UNINLINABLE (*node) = 1; | |
5848 else | |
5849 { | |
5850 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5851 *no_add_attrs = true; | |
5852 } | |
5853 | |
5854 return NULL_TREE; | |
5855 } | |
5856 | |
5857 /* Handle a "noclone" attribute; arguments as in | |
5858 struct attribute_spec.handler. */ | |
5859 | |
5860 static tree | |
5861 handle_noclone_attribute (tree *node, tree name, | |
5862 tree ARG_UNUSED (args), | |
5863 int ARG_UNUSED (flags), bool *no_add_attrs) | |
5864 { | |
5865 if (TREE_CODE (*node) != FUNCTION_DECL) | |
5866 { | |
5867 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5868 *no_add_attrs = true; | |
5869 } | |
5870 | |
5871 return NULL_TREE; | |
5872 } | |
5873 | |
5874 /* Handle a "always_inline" attribute; arguments as in | |
5875 struct attribute_spec.handler. */ | |
5876 | |
5877 static tree | |
5878 handle_always_inline_attribute (tree *node, tree name, | |
5879 tree ARG_UNUSED (args), | |
5880 int ARG_UNUSED (flags), | |
5881 bool *no_add_attrs) | |
5882 { | |
5883 if (TREE_CODE (*node) == FUNCTION_DECL) | |
5884 { | |
5885 /* Set the attribute and mark it for disregarding inline | |
5886 limits. */ | |
5887 DECL_DISREGARD_INLINE_LIMITS (*node) = 1; | |
5888 } | |
5889 else | |
5890 { | |
5891 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5892 *no_add_attrs = true; | |
5893 } | |
5894 | |
5895 return NULL_TREE; | |
5896 } | |
5897 | |
5898 /* Handle a "gnu_inline" attribute; arguments as in | |
5899 struct attribute_spec.handler. */ | |
5900 | |
5901 static tree | |
5902 handle_gnu_inline_attribute (tree *node, tree name, | |
5903 tree ARG_UNUSED (args), | |
5904 int ARG_UNUSED (flags), | |
5905 bool *no_add_attrs) | |
5906 { | |
5907 if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node)) | |
5908 { | |
5909 /* Do nothing else, just set the attribute. We'll get at | |
5910 it later with lookup_attribute. */ | |
5911 } | |
5912 else | |
5913 { | |
5914 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5915 *no_add_attrs = true; | |
5916 } | |
5917 | |
5918 return NULL_TREE; | |
5919 } | |
5920 | |
5921 /* Handle a "leaf" attribute; arguments as in | |
5922 struct attribute_spec.handler. */ | |
5923 | |
5924 static tree | |
5925 handle_leaf_attribute (tree *node, tree name, | |
5926 tree ARG_UNUSED (args), | |
5927 int ARG_UNUSED (flags), bool *no_add_attrs) | |
5928 { | |
5929 if (TREE_CODE (*node) != FUNCTION_DECL) | |
5930 { | |
5931 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5932 *no_add_attrs = true; | |
5933 } | |
5934 if (!TREE_PUBLIC (*node)) | |
5935 { | |
5936 warning (OPT_Wattributes, "%qE attribute has no effect on unit local functions", name); | |
5937 *no_add_attrs = true; | |
5938 } | |
5939 | |
5940 return NULL_TREE; | |
5941 } | |
5942 | |
5943 /* Handle an "artificial" attribute; arguments as in | |
5944 struct attribute_spec.handler. */ | |
5945 | |
5946 static tree | |
5947 handle_artificial_attribute (tree *node, tree name, | |
5948 tree ARG_UNUSED (args), | |
5949 int ARG_UNUSED (flags), | |
5950 bool *no_add_attrs) | |
5951 { | |
5952 if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node)) | |
5953 { | |
5954 /* Do nothing else, just set the attribute. We'll get at | |
5955 it later with lookup_attribute. */ | |
5956 } | |
5957 else | |
5958 { | |
5959 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5960 *no_add_attrs = true; | |
5961 } | |
5962 | |
5963 return NULL_TREE; | |
5964 } | |
5965 | |
5966 /* Handle a "flatten" attribute; arguments as in | |
5967 struct attribute_spec.handler. */ | |
5968 | |
5969 static tree | |
5970 handle_flatten_attribute (tree *node, tree name, | |
5971 tree args ATTRIBUTE_UNUSED, | |
5972 int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) | |
5973 { | |
5974 if (TREE_CODE (*node) == FUNCTION_DECL) | |
5975 /* Do nothing else, just set the attribute. We'll get at | |
5976 it later with lookup_attribute. */ | |
5977 ; | |
5978 else | |
5979 { | |
5980 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5981 *no_add_attrs = true; | |
5982 } | |
5983 | |
5984 return NULL_TREE; | |
5985 } | |
5986 | |
5987 /* Handle a "warning" or "error" attribute; arguments as in | |
5988 struct attribute_spec.handler. */ | |
5989 | |
5990 static tree | |
5991 handle_error_attribute (tree *node, tree name, tree args, | |
5992 int ARG_UNUSED (flags), bool *no_add_attrs) | |
5993 { | |
5994 if (TREE_CODE (*node) == FUNCTION_DECL | |
5995 || TREE_CODE (TREE_VALUE (args)) == STRING_CST) | |
5996 /* Do nothing else, just set the attribute. We'll get at | |
5997 it later with lookup_attribute. */ | |
5998 ; | |
5999 else | |
6000 { | |
6001 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6002 *no_add_attrs = true; | |
6003 } | |
6004 | |
6005 return NULL_TREE; | |
6006 } | |
6007 | |
6008 /* Handle a "used" attribute; arguments as in | |
6009 struct attribute_spec.handler. */ | |
6010 | |
6011 static tree | |
6012 handle_used_attribute (tree *pnode, tree name, tree ARG_UNUSED (args), | |
6013 int ARG_UNUSED (flags), bool *no_add_attrs) | |
6014 { | |
6015 tree node = *pnode; | |
6016 | |
6017 if (TREE_CODE (node) == FUNCTION_DECL | |
6018 || (TREE_CODE (node) == VAR_DECL && TREE_STATIC (node))) | |
6019 { | |
6020 TREE_USED (node) = 1; | |
6021 DECL_PRESERVE_P (node) = 1; | |
6022 if (TREE_CODE (node) == VAR_DECL) | |
6023 DECL_READ_P (node) = 1; | |
6024 } | |
6025 else | |
6026 { | |
6027 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6028 *no_add_attrs = true; | |
6029 } | |
6030 | |
6031 return NULL_TREE; | |
6032 } | |
6033 | |
6034 /* Handle a "unused" attribute; arguments as in | |
6035 struct attribute_spec.handler. */ | |
6036 | |
6037 static tree | |
6038 handle_unused_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
6039 int flags, bool *no_add_attrs) | |
6040 { | |
6041 if (DECL_P (*node)) | |
6042 { | |
6043 tree decl = *node; | |
6044 | |
6045 if (TREE_CODE (decl) == PARM_DECL | |
6046 || TREE_CODE (decl) == VAR_DECL | |
6047 || TREE_CODE (decl) == FUNCTION_DECL | |
6048 || TREE_CODE (decl) == LABEL_DECL | |
6049 || TREE_CODE (decl) == TYPE_DECL) | |
6050 { | |
6051 TREE_USED (decl) = 1; | |
6052 if (TREE_CODE (decl) == VAR_DECL | |
6053 || TREE_CODE (decl) == PARM_DECL) | |
6054 DECL_READ_P (decl) = 1; | |
6055 } | |
6056 else | |
6057 { | |
6058 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6059 *no_add_attrs = true; | |
6060 } | |
6061 } | |
6062 else | |
6063 { | |
6064 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
6065 *node = build_variant_type_copy (*node); | |
6066 TREE_USED (*node) = 1; | |
6067 } | |
6068 | |
6069 return NULL_TREE; | |
6070 } | |
6071 | |
6072 /* Handle a "externally_visible" attribute; arguments as in | |
6073 struct attribute_spec.handler. */ | |
6074 | |
6075 static tree | |
6076 handle_externally_visible_attribute (tree *pnode, tree name, | |
6077 tree ARG_UNUSED (args), | |
6078 int ARG_UNUSED (flags), | |
6079 bool *no_add_attrs) | |
6080 { | |
6081 tree node = *pnode; | |
6082 | |
6083 if (TREE_CODE (node) == FUNCTION_DECL || TREE_CODE (node) == VAR_DECL) | |
6084 { | |
6085 if ((!TREE_STATIC (node) && TREE_CODE (node) != FUNCTION_DECL | |
6086 && !DECL_EXTERNAL (node)) || !TREE_PUBLIC (node)) | |
6087 { | |
6088 warning (OPT_Wattributes, | |
6089 "%qE attribute have effect only on public objects", name); | |
6090 *no_add_attrs = true; | |
6091 } | |
6092 } | |
6093 else | |
6094 { | |
6095 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6096 *no_add_attrs = true; | |
6097 } | |
6098 | |
6099 return NULL_TREE; | |
6100 } | |
6101 | |
6102 /* Handle a "const" attribute; arguments as in | |
6103 struct attribute_spec.handler. */ | |
6104 | |
6105 static tree | |
6106 handle_const_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
6107 int ARG_UNUSED (flags), bool *no_add_attrs) | |
6108 { | |
6109 tree type = TREE_TYPE (*node); | |
6110 | |
6111 /* See FIXME comment on noreturn in c_common_attribute_table. */ | |
6112 if (TREE_CODE (*node) == FUNCTION_DECL) | |
6113 TREE_READONLY (*node) = 1; | |
6114 else if (TREE_CODE (type) == POINTER_TYPE | |
6115 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
6116 TREE_TYPE (*node) | |
6117 = build_pointer_type | |
6118 (build_type_variant (TREE_TYPE (type), 1, | |
6119 TREE_THIS_VOLATILE (TREE_TYPE (type)))); | |
6120 else | |
6121 { | |
6122 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6123 *no_add_attrs = true; | |
6124 } | |
6125 | |
6126 return NULL_TREE; | |
6127 } | |
6128 | |
6129 /* Handle a "transparent_union" attribute; arguments as in | |
6130 struct attribute_spec.handler. */ | |
6131 | |
6132 static tree | |
6133 handle_transparent_union_attribute (tree *node, tree name, | |
6134 tree ARG_UNUSED (args), int flags, | |
6135 bool *no_add_attrs) | |
6136 { | |
6137 tree type; | |
6138 | |
6139 *no_add_attrs = true; | |
6140 | |
6141 if (TREE_CODE (*node) == TYPE_DECL) | |
6142 node = &TREE_TYPE (*node); | |
6143 type = *node; | |
6144 | |
6145 if (TREE_CODE (type) == UNION_TYPE) | |
6146 { | |
6147 /* When IN_PLACE is set, leave the check for FIELDS and MODE to | |
6148 the code in finish_struct. */ | |
6149 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
6150 { | |
6151 if (TYPE_FIELDS (type) == NULL_TREE | |
6152 || TYPE_MODE (type) != DECL_MODE (TYPE_FIELDS (type))) | |
6153 goto ignored; | |
6154 | |
6155 /* A type variant isn't good enough, since we don't a cast | |
6156 to such a type removed as a no-op. */ | |
6157 *node = type = build_duplicate_type (type); | |
6158 } | |
6159 | |
6160 TYPE_TRANSPARENT_AGGR (type) = 1; | |
6161 return NULL_TREE; | |
6162 } | |
6163 | |
6164 ignored: | |
6165 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6166 return NULL_TREE; | |
6167 } | |
6168 | |
6169 /* Subroutine of handle_{con,de}structor_attribute. Evaluate ARGS to | |
6170 get the requested priority for a constructor or destructor, | |
6171 possibly issuing diagnostics for invalid or reserved | |
6172 priorities. */ | |
6173 | |
6174 static priority_type | |
6175 get_priority (tree args, bool is_destructor) | |
6176 { | |
6177 HOST_WIDE_INT pri; | |
6178 tree arg; | |
6179 | |
6180 if (!args) | |
6181 return DEFAULT_INIT_PRIORITY; | |
6182 | |
6183 if (!SUPPORTS_INIT_PRIORITY) | |
6184 { | |
6185 if (is_destructor) | |
6186 error ("destructor priorities are not supported"); | |
6187 else | |
6188 error ("constructor priorities are not supported"); | |
6189 return DEFAULT_INIT_PRIORITY; | |
6190 } | |
6191 | |
6192 arg = TREE_VALUE (args); | |
6193 if (!host_integerp (arg, /*pos=*/0) | |
6194 || !INTEGRAL_TYPE_P (TREE_TYPE (arg))) | |
6195 goto invalid; | |
6196 | |
6197 pri = tree_low_cst (TREE_VALUE (args), /*pos=*/0); | |
6198 if (pri < 0 || pri > MAX_INIT_PRIORITY) | |
6199 goto invalid; | |
6200 | |
6201 if (pri <= MAX_RESERVED_INIT_PRIORITY) | |
6202 { | |
6203 if (is_destructor) | |
6204 warning (0, | |
6205 "destructor priorities from 0 to %d are reserved " | |
6206 "for the implementation", | |
6207 MAX_RESERVED_INIT_PRIORITY); | |
6208 else | |
6209 warning (0, | |
6210 "constructor priorities from 0 to %d are reserved " | |
6211 "for the implementation", | |
6212 MAX_RESERVED_INIT_PRIORITY); | |
6213 } | |
6214 return pri; | |
6215 | |
6216 invalid: | |
6217 if (is_destructor) | |
6218 error ("destructor priorities must be integers from 0 to %d inclusive", | |
6219 MAX_INIT_PRIORITY); | |
6220 else | |
6221 error ("constructor priorities must be integers from 0 to %d inclusive", | |
6222 MAX_INIT_PRIORITY); | |
6223 return DEFAULT_INIT_PRIORITY; | |
6224 } | |
6225 | |
6226 /* Handle a "constructor" attribute; arguments as in | |
6227 struct attribute_spec.handler. */ | |
6228 | |
6229 static tree | |
6230 handle_constructor_attribute (tree *node, tree name, tree args, | |
6231 int ARG_UNUSED (flags), | |
6232 bool *no_add_attrs) | |
6233 { | |
6234 tree decl = *node; | |
6235 tree type = TREE_TYPE (decl); | |
6236 | |
6237 if (TREE_CODE (decl) == FUNCTION_DECL | |
6238 && TREE_CODE (type) == FUNCTION_TYPE | |
6239 && decl_function_context (decl) == 0) | |
6240 { | |
6241 priority_type priority; | |
6242 DECL_STATIC_CONSTRUCTOR (decl) = 1; | |
6243 priority = get_priority (args, /*is_destructor=*/false); | |
6244 SET_DECL_INIT_PRIORITY (decl, priority); | |
6245 TREE_USED (decl) = 1; | |
6246 } | |
6247 else | |
6248 { | |
6249 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6250 *no_add_attrs = true; | |
6251 } | |
6252 | |
6253 return NULL_TREE; | |
6254 } | |
6255 | |
6256 /* Handle a "destructor" attribute; arguments as in | |
6257 struct attribute_spec.handler. */ | |
6258 | |
6259 static tree | |
6260 handle_destructor_attribute (tree *node, tree name, tree args, | |
6261 int ARG_UNUSED (flags), | |
6262 bool *no_add_attrs) | |
6263 { | |
6264 tree decl = *node; | |
6265 tree type = TREE_TYPE (decl); | |
6266 | |
6267 if (TREE_CODE (decl) == FUNCTION_DECL | |
6268 && TREE_CODE (type) == FUNCTION_TYPE | |
6269 && decl_function_context (decl) == 0) | |
6270 { | |
6271 priority_type priority; | |
6272 DECL_STATIC_DESTRUCTOR (decl) = 1; | |
6273 priority = get_priority (args, /*is_destructor=*/true); | |
6274 SET_DECL_FINI_PRIORITY (decl, priority); | |
6275 TREE_USED (decl) = 1; | |
6276 } | |
6277 else | |
6278 { | |
6279 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6280 *no_add_attrs = true; | |
6281 } | |
6282 | |
6283 return NULL_TREE; | |
6284 } | |
6285 | |
6286 /* Nonzero if the mode is a valid vector mode for this architecture. | |
6287 This returns nonzero even if there is no hardware support for the | |
6288 vector mode, but we can emulate with narrower modes. */ | |
6289 | |
6290 static int | |
6291 vector_mode_valid_p (enum machine_mode mode) | |
6292 { | |
6293 enum mode_class mclass = GET_MODE_CLASS (mode); | |
6294 enum machine_mode innermode; | |
6295 | |
6296 /* Doh! What's going on? */ | |
6297 if (mclass != MODE_VECTOR_INT | |
6298 && mclass != MODE_VECTOR_FLOAT | |
6299 && mclass != MODE_VECTOR_FRACT | |
6300 && mclass != MODE_VECTOR_UFRACT | |
6301 && mclass != MODE_VECTOR_ACCUM | |
6302 && mclass != MODE_VECTOR_UACCUM) | |
6303 return 0; | |
6304 | |
6305 /* Hardware support. Woo hoo! */ | |
6306 if (targetm.vector_mode_supported_p (mode)) | |
6307 return 1; | |
6308 | |
6309 innermode = GET_MODE_INNER (mode); | |
6310 | |
6311 /* We should probably return 1 if requesting V4DI and we have no DI, | |
6312 but we have V2DI, but this is probably very unlikely. */ | |
6313 | |
6314 /* If we have support for the inner mode, we can safely emulate it. | |
6315 We may not have V2DI, but me can emulate with a pair of DIs. */ | |
6316 return targetm.scalar_mode_supported_p (innermode); | |
6317 } | |
6318 | |
6319 | |
6320 /* Handle a "mode" attribute; arguments as in | |
6321 struct attribute_spec.handler. */ | |
6322 | |
6323 static tree | |
6324 handle_mode_attribute (tree *node, tree name, tree args, | |
6325 int ARG_UNUSED (flags), bool *no_add_attrs) | |
6326 { | |
6327 tree type = *node; | |
6328 tree ident = TREE_VALUE (args); | |
6329 | |
6330 *no_add_attrs = true; | |
6331 | |
6332 if (TREE_CODE (ident) != IDENTIFIER_NODE) | |
6333 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6334 else | |
6335 { | |
6336 int j; | |
6337 const char *p = IDENTIFIER_POINTER (ident); | |
6338 int len = strlen (p); | |
6339 enum machine_mode mode = VOIDmode; | |
6340 tree typefm; | |
6341 bool valid_mode; | |
6342 | |
6343 if (len > 4 && p[0] == '_' && p[1] == '_' | |
6344 && p[len - 1] == '_' && p[len - 2] == '_') | |
6345 { | |
6346 char *newp = (char *) alloca (len - 1); | |
6347 | |
6348 strcpy (newp, &p[2]); | |
6349 newp[len - 4] = '\0'; | |
6350 p = newp; | |
6351 } | |
6352 | |
6353 /* Change this type to have a type with the specified mode. | |
6354 First check for the special modes. */ | |
6355 if (!strcmp (p, "byte")) | |
6356 mode = byte_mode; | |
6357 else if (!strcmp (p, "word")) | |
6358 mode = word_mode; | |
6359 else if (!strcmp (p, "pointer")) | |
6360 mode = ptr_mode; | |
6361 else if (!strcmp (p, "libgcc_cmp_return")) | |
6362 mode = targetm.libgcc_cmp_return_mode (); | |
6363 else if (!strcmp (p, "libgcc_shift_count")) | |
6364 mode = targetm.libgcc_shift_count_mode (); | |
6365 else if (!strcmp (p, "unwind_word")) | |
6366 mode = targetm.unwind_word_mode (); | |
6367 else | |
6368 for (j = 0; j < NUM_MACHINE_MODES; j++) | |
6369 if (!strcmp (p, GET_MODE_NAME (j))) | |
6370 { | |
6371 mode = (enum machine_mode) j; | |
6372 break; | |
6373 } | |
6374 | |
6375 if (mode == VOIDmode) | |
6376 { | |
6377 error ("unknown machine mode %qE", ident); | |
6378 return NULL_TREE; | |
6379 } | |
6380 | |
6381 valid_mode = false; | |
6382 switch (GET_MODE_CLASS (mode)) | |
6383 { | |
6384 case MODE_INT: | |
6385 case MODE_PARTIAL_INT: | |
6386 case MODE_FLOAT: | |
6387 case MODE_DECIMAL_FLOAT: | |
6388 case MODE_FRACT: | |
6389 case MODE_UFRACT: | |
6390 case MODE_ACCUM: | |
6391 case MODE_UACCUM: | |
6392 valid_mode = targetm.scalar_mode_supported_p (mode); | |
6393 break; | |
6394 | |
6395 case MODE_COMPLEX_INT: | |
6396 case MODE_COMPLEX_FLOAT: | |
6397 valid_mode = targetm.scalar_mode_supported_p (GET_MODE_INNER (mode)); | |
6398 break; | |
6399 | |
6400 case MODE_VECTOR_INT: | |
6401 case MODE_VECTOR_FLOAT: | |
6402 case MODE_VECTOR_FRACT: | |
6403 case MODE_VECTOR_UFRACT: | |
6404 case MODE_VECTOR_ACCUM: | |
6405 case MODE_VECTOR_UACCUM: | |
6406 warning (OPT_Wattributes, "specifying vector types with " | |
6407 "__attribute__ ((mode)) is deprecated"); | |
6408 warning (OPT_Wattributes, | |
6409 "use __attribute__ ((vector_size)) instead"); | |
6410 valid_mode = vector_mode_valid_p (mode); | |
6411 break; | |
6412 | |
6413 default: | |
6414 break; | |
6415 } | |
6416 if (!valid_mode) | |
6417 { | |
6418 error ("unable to emulate %qs", p); | |
6419 return NULL_TREE; | |
6420 } | |
6421 | |
6422 if (POINTER_TYPE_P (type)) | |
6423 { | |
6424 addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (type)); | |
6425 tree (*fn)(tree, enum machine_mode, bool); | |
6426 | |
6427 if (!targetm.addr_space.valid_pointer_mode (mode, as)) | |
6428 { | |
6429 error ("invalid pointer mode %qs", p); | |
6430 return NULL_TREE; | |
6431 } | |
6432 | |
6433 if (TREE_CODE (type) == POINTER_TYPE) | |
6434 fn = build_pointer_type_for_mode; | |
6435 else | |
6436 fn = build_reference_type_for_mode; | |
6437 typefm = fn (TREE_TYPE (type), mode, false); | |
6438 } | |
6439 else | |
6440 { | |
6441 /* For fixed-point modes, we need to test if the signness of type | |
6442 and the machine mode are consistent. */ | |
6443 if (ALL_FIXED_POINT_MODE_P (mode) | |
6444 && TYPE_UNSIGNED (type) != UNSIGNED_FIXED_POINT_MODE_P (mode)) | |
6445 { | |
6446 error ("signedness of type and machine mode %qs don%'t match", p); | |
6447 return NULL_TREE; | |
6448 } | |
6449 /* For fixed-point modes, we need to pass saturating info. */ | |
6450 typefm = lang_hooks.types.type_for_mode (mode, | |
6451 ALL_FIXED_POINT_MODE_P (mode) ? TYPE_SATURATING (type) | |
6452 : TYPE_UNSIGNED (type)); | |
6453 } | |
6454 | |
6455 if (typefm == NULL_TREE) | |
6456 { | |
6457 error ("no data type for mode %qs", p); | |
6458 return NULL_TREE; | |
6459 } | |
6460 else if (TREE_CODE (type) == ENUMERAL_TYPE) | |
6461 { | |
6462 /* For enumeral types, copy the precision from the integer | |
6463 type returned above. If not an INTEGER_TYPE, we can't use | |
6464 this mode for this type. */ | |
6465 if (TREE_CODE (typefm) != INTEGER_TYPE) | |
6466 { | |
6467 error ("cannot use mode %qs for enumeral types", p); | |
6468 return NULL_TREE; | |
6469 } | |
6470 | |
6471 if (flags & ATTR_FLAG_TYPE_IN_PLACE) | |
6472 { | |
6473 TYPE_PRECISION (type) = TYPE_PRECISION (typefm); | |
6474 typefm = type; | |
6475 } | |
6476 else | |
6477 { | |
6478 /* We cannot build a type variant, as there's code that assumes | |
6479 that TYPE_MAIN_VARIANT has the same mode. This includes the | |
6480 debug generators. Instead, create a subrange type. This | |
6481 results in all of the enumeral values being emitted only once | |
6482 in the original, and the subtype gets them by reference. */ | |
6483 if (TYPE_UNSIGNED (type)) | |
6484 typefm = make_unsigned_type (TYPE_PRECISION (typefm)); | |
6485 else | |
6486 typefm = make_signed_type (TYPE_PRECISION (typefm)); | |
6487 TREE_TYPE (typefm) = type; | |
6488 } | |
6489 } | |
6490 else if (VECTOR_MODE_P (mode) | |
6491 ? TREE_CODE (type) != TREE_CODE (TREE_TYPE (typefm)) | |
6492 : TREE_CODE (type) != TREE_CODE (typefm)) | |
6493 { | |
6494 error ("mode %qs applied to inappropriate type", p); | |
6495 return NULL_TREE; | |
6496 } | |
6497 | |
6498 *node = typefm; | |
6499 } | |
6500 | |
6501 return NULL_TREE; | |
6502 } | |
6503 | |
6504 /* Handle a "section" attribute; arguments as in | |
6505 struct attribute_spec.handler. */ | |
6506 | |
6507 static tree | |
6508 handle_section_attribute (tree *node, tree ARG_UNUSED (name), tree args, | |
6509 int ARG_UNUSED (flags), bool *no_add_attrs) | |
6510 { | |
6511 tree decl = *node; | |
6512 | |
6513 if (targetm.have_named_sections) | |
6514 { | |
6515 user_defined_section_attribute = true; | |
6516 | |
6517 if ((TREE_CODE (decl) == FUNCTION_DECL | |
6518 || TREE_CODE (decl) == VAR_DECL) | |
6519 && TREE_CODE (TREE_VALUE (args)) == STRING_CST) | |
6520 { | |
6521 if (TREE_CODE (decl) == VAR_DECL | |
6522 && current_function_decl != NULL_TREE | |
6523 && !TREE_STATIC (decl)) | |
6524 { | |
6525 error_at (DECL_SOURCE_LOCATION (decl), | |
6526 "section attribute cannot be specified for " | |
6527 "local variables"); | |
6528 *no_add_attrs = true; | |
6529 } | |
6530 | |
6531 /* The decl may have already been given a section attribute | |
6532 from a previous declaration. Ensure they match. */ | |
6533 else if (DECL_SECTION_NAME (decl) != NULL_TREE | |
6534 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)), | |
6535 TREE_STRING_POINTER (TREE_VALUE (args))) != 0) | |
6536 { | |
6537 error ("section of %q+D conflicts with previous declaration", | |
6538 *node); | |
6539 *no_add_attrs = true; | |
6540 } | |
6541 else if (TREE_CODE (decl) == VAR_DECL | |
6542 && !targetm.have_tls && targetm.emutls.tmpl_section | |
6543 && DECL_THREAD_LOCAL_P (decl)) | |
6544 { | |
6545 error ("section of %q+D cannot be overridden", *node); | |
6546 *no_add_attrs = true; | |
6547 } | |
6548 else | |
6549 DECL_SECTION_NAME (decl) = TREE_VALUE (args); | |
6550 } | |
6551 else | |
6552 { | |
6553 error ("section attribute not allowed for %q+D", *node); | |
6554 *no_add_attrs = true; | |
6555 } | |
6556 } | |
6557 else | |
6558 { | |
6559 error_at (DECL_SOURCE_LOCATION (*node), | |
6560 "section attributes are not supported for this target"); | |
6561 *no_add_attrs = true; | |
6562 } | |
6563 | |
6564 return NULL_TREE; | |
6565 } | |
6566 | |
6567 /* Handle a "aligned" attribute; arguments as in | |
6568 struct attribute_spec.handler. */ | |
6569 | |
6570 static tree | |
6571 handle_aligned_attribute (tree *node, tree ARG_UNUSED (name), tree args, | |
6572 int flags, bool *no_add_attrs) | |
6573 { | |
6574 tree decl = NULL_TREE; | |
6575 tree *type = NULL; | |
6576 int is_type = 0; | |
6577 tree align_expr = (args ? TREE_VALUE (args) | |
6578 : size_int (ATTRIBUTE_ALIGNED_VALUE / BITS_PER_UNIT)); | |
6579 int i; | |
6580 | |
6581 if (DECL_P (*node)) | |
6582 { | |
6583 decl = *node; | |
6584 type = &TREE_TYPE (decl); | |
6585 is_type = TREE_CODE (*node) == TYPE_DECL; | |
6586 } | |
6587 else if (TYPE_P (*node)) | |
6588 type = node, is_type = 1; | |
6589 | |
6590 if (TREE_CODE (align_expr) != INTEGER_CST) | |
6591 { | |
6592 error ("requested alignment is not a constant"); | |
6593 *no_add_attrs = true; | |
6594 } | |
6595 else if ((i = tree_log2 (align_expr)) == -1) | |
6596 { | |
6597 error ("requested alignment is not a power of 2"); | |
6598 *no_add_attrs = true; | |
6599 } | |
6600 else if (i >= HOST_BITS_PER_INT - BITS_PER_UNIT_LOG) | |
6601 { | |
6602 error ("requested alignment is too large"); | |
6603 *no_add_attrs = true; | |
6604 } | |
6605 else if (is_type) | |
6606 { | |
6607 if ((flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
6608 /* OK, modify the type in place. */; | |
6609 /* If we have a TYPE_DECL, then copy the type, so that we | |
6610 don't accidentally modify a builtin type. See pushdecl. */ | |
6611 else if (decl && TREE_TYPE (decl) != error_mark_node | |
6612 && DECL_ORIGINAL_TYPE (decl) == NULL_TREE) | |
6613 { | |
6614 tree tt = TREE_TYPE (decl); | |
6615 *type = build_variant_type_copy (*type); | |
6616 DECL_ORIGINAL_TYPE (decl) = tt; | |
6617 TYPE_NAME (*type) = decl; | |
6618 TREE_USED (*type) = TREE_USED (decl); | |
6619 TREE_TYPE (decl) = *type; | |
6620 } | |
6621 else | |
6622 *type = build_variant_type_copy (*type); | |
6623 | |
6624 TYPE_ALIGN (*type) = (1U << i) * BITS_PER_UNIT; | |
6625 TYPE_USER_ALIGN (*type) = 1; | |
6626 } | |
6627 else if (! VAR_OR_FUNCTION_DECL_P (decl) | |
6628 && TREE_CODE (decl) != FIELD_DECL) | |
6629 { | |
6630 error ("alignment may not be specified for %q+D", decl); | |
6631 *no_add_attrs = true; | |
6632 } | |
6633 else if (TREE_CODE (decl) == FUNCTION_DECL | |
6634 && DECL_ALIGN (decl) > (1U << i) * BITS_PER_UNIT) | |
6635 { | |
6636 if (DECL_USER_ALIGN (decl)) | |
6637 error ("alignment for %q+D was previously specified as %d " | |
6638 "and may not be decreased", decl, | |
6639 DECL_ALIGN (decl) / BITS_PER_UNIT); | |
6640 else | |
6641 error ("alignment for %q+D must be at least %d", decl, | |
6642 DECL_ALIGN (decl) / BITS_PER_UNIT); | |
6643 *no_add_attrs = true; | |
6644 } | |
6645 else | |
6646 { | |
6647 DECL_ALIGN (decl) = (1U << i) * BITS_PER_UNIT; | |
6648 DECL_USER_ALIGN (decl) = 1; | |
6649 } | |
6650 | |
6651 return NULL_TREE; | |
6652 } | |
6653 | |
6654 /* Handle a "weak" attribute; arguments as in | |
6655 struct attribute_spec.handler. */ | |
6656 | |
6657 static tree | |
6658 handle_weak_attribute (tree *node, tree name, | |
6659 tree ARG_UNUSED (args), | |
6660 int ARG_UNUSED (flags), | |
6661 bool * ARG_UNUSED (no_add_attrs)) | |
6662 { | |
6663 if (TREE_CODE (*node) == FUNCTION_DECL | |
6664 && DECL_DECLARED_INLINE_P (*node)) | |
6665 { | |
6666 warning (OPT_Wattributes, "inline function %q+D declared weak", *node); | |
6667 *no_add_attrs = true; | |
6668 } | |
6669 else if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (*node))) | |
6670 { | |
6671 error ("indirect function %q+D cannot be declared weak", *node); | |
6672 *no_add_attrs = true; | |
6673 return NULL_TREE; | |
6674 } | |
6675 else if (TREE_CODE (*node) == FUNCTION_DECL | |
6676 || TREE_CODE (*node) == VAR_DECL) | |
6677 declare_weak (*node); | |
6678 else | |
6679 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6680 | |
6681 return NULL_TREE; | |
6682 } | |
6683 | |
6684 /* Handle an "alias" or "ifunc" attribute; arguments as in | |
6685 struct attribute_spec.handler, except that IS_ALIAS tells us | |
6686 whether this is an alias as opposed to ifunc attribute. */ | |
6687 | |
6688 static tree | |
6689 handle_alias_ifunc_attribute (bool is_alias, tree *node, tree name, tree args, | |
6690 bool *no_add_attrs) | |
6691 { | |
6692 tree decl = *node; | |
6693 | |
6694 if (TREE_CODE (decl) != FUNCTION_DECL | |
6695 && (!is_alias || TREE_CODE (decl) != VAR_DECL)) | |
6696 { | |
6697 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6698 *no_add_attrs = true; | |
6699 } | |
6700 else if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl)) | |
6701 || (TREE_CODE (decl) != FUNCTION_DECL | |
6702 && TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl)) | |
6703 /* A static variable declaration is always a tentative definition, | |
6704 but the alias is a non-tentative definition which overrides. */ | |
6705 || (TREE_CODE (decl) != FUNCTION_DECL | |
6706 && ! TREE_PUBLIC (decl) && DECL_INITIAL (decl))) | |
6707 { | |
6708 error ("%q+D defined both normally and as %qE attribute", decl, name); | |
6709 *no_add_attrs = true; | |
6710 return NULL_TREE; | |
6711 } | |
6712 else if (!is_alias | |
6713 && (lookup_attribute ("weak", DECL_ATTRIBUTES (decl)) | |
6714 || lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))) | |
6715 { | |
6716 error ("weak %q+D cannot be defined %qE", decl, name); | |
6717 *no_add_attrs = true; | |
6718 return NULL_TREE; | |
6719 } | |
6720 | |
6721 /* Note that the very first time we process a nested declaration, | |
6722 decl_function_context will not be set. Indeed, *would* never | |
6723 be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that | |
6724 we do below. After such frobbery, pushdecl would set the context. | |
6725 In any case, this is never what we want. */ | |
6726 else if (decl_function_context (decl) == 0 && current_function_decl == NULL) | |
6727 { | |
6728 tree id; | |
6729 | |
6730 id = TREE_VALUE (args); | |
6731 if (TREE_CODE (id) != STRING_CST) | |
6732 { | |
6733 error ("attribute %qE argument not a string", name); | |
6734 *no_add_attrs = true; | |
6735 return NULL_TREE; | |
6736 } | |
6737 id = get_identifier (TREE_STRING_POINTER (id)); | |
6738 /* This counts as a use of the object pointed to. */ | |
6739 TREE_USED (id) = 1; | |
6740 | |
6741 if (TREE_CODE (decl) == FUNCTION_DECL) | |
6742 DECL_INITIAL (decl) = error_mark_node; | |
6743 else | |
6744 { | |
6745 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))) | |
6746 DECL_EXTERNAL (decl) = 1; | |
6747 else | |
6748 DECL_EXTERNAL (decl) = 0; | |
6749 TREE_STATIC (decl) = 1; | |
6750 } | |
6751 | |
6752 if (!is_alias) | |
6753 /* ifuncs are also aliases, so set that attribute too. */ | |
6754 DECL_ATTRIBUTES (decl) | |
6755 = tree_cons (get_identifier ("alias"), args, DECL_ATTRIBUTES (decl)); | |
6756 } | |
6757 else | |
6758 { | |
6759 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6760 *no_add_attrs = true; | |
6761 } | |
6762 | |
6763 return NULL_TREE; | |
6764 } | |
6765 | |
6766 /* Handle an "alias" or "ifunc" attribute; arguments as in | |
6767 struct attribute_spec.handler. */ | |
6768 | |
6769 static tree | |
6770 handle_ifunc_attribute (tree *node, tree name, tree args, | |
6771 int ARG_UNUSED (flags), bool *no_add_attrs) | |
6772 { | |
6773 return handle_alias_ifunc_attribute (false, node, name, args, no_add_attrs); | |
6774 } | |
6775 | |
6776 /* Handle an "alias" or "ifunc" attribute; arguments as in | |
6777 struct attribute_spec.handler. */ | |
6778 | |
6779 static tree | |
6780 handle_alias_attribute (tree *node, tree name, tree args, | |
6781 int ARG_UNUSED (flags), bool *no_add_attrs) | |
6782 { | |
6783 return handle_alias_ifunc_attribute (true, node, name, args, no_add_attrs); | |
6784 } | |
6785 | |
6786 /* Handle a "weakref" attribute; arguments as in struct | |
6787 attribute_spec.handler. */ | |
6788 | |
6789 static tree | |
6790 handle_weakref_attribute (tree *node, tree ARG_UNUSED (name), tree args, | |
6791 int flags, bool *no_add_attrs) | |
6792 { | |
6793 tree attr = NULL_TREE; | |
6794 | |
6795 /* We must ignore the attribute when it is associated with | |
6796 local-scoped decls, since attribute alias is ignored and many | |
6797 such symbols do not even have a DECL_WEAK field. */ | |
6798 if (decl_function_context (*node) | |
6799 || current_function_decl | |
6800 || (TREE_CODE (*node) != VAR_DECL && TREE_CODE (*node) != FUNCTION_DECL)) | |
6801 { | |
6802 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6803 *no_add_attrs = true; | |
6804 return NULL_TREE; | |
6805 } | |
6806 | |
6807 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (*node))) | |
6808 { | |
6809 error ("indirect function %q+D cannot be declared weakref", *node); | |
6810 *no_add_attrs = true; | |
6811 return NULL_TREE; | |
6812 } | |
6813 | |
6814 /* The idea here is that `weakref("name")' mutates into `weakref, | |
6815 alias("name")', and weakref without arguments, in turn, | |
6816 implicitly adds weak. */ | |
6817 | |
6818 if (args) | |
6819 { | |
6820 attr = tree_cons (get_identifier ("alias"), args, attr); | |
6821 attr = tree_cons (get_identifier ("weakref"), NULL_TREE, attr); | |
6822 | |
6823 *no_add_attrs = true; | |
6824 | |
6825 decl_attributes (node, attr, flags); | |
6826 } | |
6827 else | |
6828 { | |
6829 if (lookup_attribute ("alias", DECL_ATTRIBUTES (*node))) | |
6830 error_at (DECL_SOURCE_LOCATION (*node), | |
6831 "weakref attribute must appear before alias attribute"); | |
6832 | |
6833 /* Can't call declare_weak because it wants this to be TREE_PUBLIC, | |
6834 and that isn't supported; and because it wants to add it to | |
6835 the list of weak decls, which isn't helpful. */ | |
6836 DECL_WEAK (*node) = 1; | |
6837 } | |
6838 | |
6839 return NULL_TREE; | |
6840 } | |
6841 | |
6842 /* Handle an "visibility" attribute; arguments as in | |
6843 struct attribute_spec.handler. */ | |
6844 | |
6845 static tree | |
6846 handle_visibility_attribute (tree *node, tree name, tree args, | |
6847 int ARG_UNUSED (flags), | |
6848 bool *ARG_UNUSED (no_add_attrs)) | |
6849 { | |
6850 tree decl = *node; | |
6851 tree id = TREE_VALUE (args); | |
6852 enum symbol_visibility vis; | |
6853 | |
6854 if (TYPE_P (*node)) | |
6855 { | |
6856 if (TREE_CODE (*node) == ENUMERAL_TYPE) | |
6857 /* OK */; | |
6858 else if (TREE_CODE (*node) != RECORD_TYPE && TREE_CODE (*node) != UNION_TYPE) | |
6859 { | |
6860 warning (OPT_Wattributes, "%qE attribute ignored on non-class types", | |
6861 name); | |
6862 return NULL_TREE; | |
6863 } | |
6864 else if (TYPE_FIELDS (*node)) | |
6865 { | |
6866 error ("%qE attribute ignored because %qT is already defined", | |
6867 name, *node); | |
6868 return NULL_TREE; | |
6869 } | |
6870 } | |
6871 else if (decl_function_context (decl) != 0 || !TREE_PUBLIC (decl)) | |
6872 { | |
6873 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6874 return NULL_TREE; | |
6875 } | |
6876 | |
6877 if (TREE_CODE (id) != STRING_CST) | |
6878 { | |
6879 error ("visibility argument not a string"); | |
6880 return NULL_TREE; | |
6881 } | |
6882 | |
6883 /* If this is a type, set the visibility on the type decl. */ | |
6884 if (TYPE_P (decl)) | |
6885 { | |
6886 decl = TYPE_NAME (decl); | |
6887 if (!decl) | |
6888 return NULL_TREE; | |
6889 if (TREE_CODE (decl) == IDENTIFIER_NODE) | |
6890 { | |
6891 warning (OPT_Wattributes, "%qE attribute ignored on types", | |
6892 name); | |
6893 return NULL_TREE; | |
6894 } | |
6895 } | |
6896 | |
6897 if (strcmp (TREE_STRING_POINTER (id), "default") == 0) | |
6898 vis = VISIBILITY_DEFAULT; | |
6899 else if (strcmp (TREE_STRING_POINTER (id), "internal") == 0) | |
6900 vis = VISIBILITY_INTERNAL; | |
6901 else if (strcmp (TREE_STRING_POINTER (id), "hidden") == 0) | |
6902 vis = VISIBILITY_HIDDEN; | |
6903 else if (strcmp (TREE_STRING_POINTER (id), "protected") == 0) | |
6904 vis = VISIBILITY_PROTECTED; | |
6905 else | |
6906 { | |
6907 error ("visibility argument must be one of \"default\", \"hidden\", \"protected\" or \"internal\""); | |
6908 vis = VISIBILITY_DEFAULT; | |
6909 } | |
6910 | |
6911 if (DECL_VISIBILITY_SPECIFIED (decl) | |
6912 && vis != DECL_VISIBILITY (decl)) | |
6913 { | |
6914 tree attributes = (TYPE_P (*node) | |
6915 ? TYPE_ATTRIBUTES (*node) | |
6916 : DECL_ATTRIBUTES (decl)); | |
6917 if (lookup_attribute ("visibility", attributes)) | |
6918 error ("%qD redeclared with different visibility", decl); | |
6919 else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
6920 && lookup_attribute ("dllimport", attributes)) | |
6921 error ("%qD was declared %qs which implies default visibility", | |
6922 decl, "dllimport"); | |
6923 else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
6924 && lookup_attribute ("dllexport", attributes)) | |
6925 error ("%qD was declared %qs which implies default visibility", | |
6926 decl, "dllexport"); | |
6927 } | |
6928 | |
6929 DECL_VISIBILITY (decl) = vis; | |
6930 DECL_VISIBILITY_SPECIFIED (decl) = 1; | |
6931 | |
6932 /* Go ahead and attach the attribute to the node as well. This is needed | |
6933 so we can determine whether we have VISIBILITY_DEFAULT because the | |
6934 visibility was not specified, or because it was explicitly overridden | |
6935 from the containing scope. */ | |
6936 | |
6937 return NULL_TREE; | |
6938 } | |
6939 | |
6940 /* Determine the ELF symbol visibility for DECL, which is either a | |
6941 variable or a function. It is an error to use this function if a | |
6942 definition of DECL is not available in this translation unit. | |
6943 Returns true if the final visibility has been determined by this | |
6944 function; false if the caller is free to make additional | |
6945 modifications. */ | |
6946 | |
6947 bool | |
6948 c_determine_visibility (tree decl) | |
6949 { | |
6950 gcc_assert (TREE_CODE (decl) == VAR_DECL | |
6951 || TREE_CODE (decl) == FUNCTION_DECL); | |
6952 | |
6953 /* If the user explicitly specified the visibility with an | |
6954 attribute, honor that. DECL_VISIBILITY will have been set during | |
6955 the processing of the attribute. We check for an explicit | |
6956 attribute, rather than just checking DECL_VISIBILITY_SPECIFIED, | |
6957 to distinguish the use of an attribute from the use of a "#pragma | |
6958 GCC visibility push(...)"; in the latter case we still want other | |
6959 considerations to be able to overrule the #pragma. */ | |
6960 if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl)) | |
6961 || (TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
6962 && (lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl)) | |
6963 || lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl))))) | |
6964 return true; | |
6965 | |
6966 /* Set default visibility to whatever the user supplied with | |
6967 visibility_specified depending on #pragma GCC visibility. */ | |
6968 if (!DECL_VISIBILITY_SPECIFIED (decl)) | |
6969 { | |
6970 if (visibility_options.inpragma | |
6971 || DECL_VISIBILITY (decl) != default_visibility) | |
6972 { | |
6973 DECL_VISIBILITY (decl) = default_visibility; | |
6974 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma; | |
6975 /* If visibility changed and DECL already has DECL_RTL, ensure | |
6976 symbol flags are updated. */ | |
6977 if (((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)) | |
6978 || TREE_CODE (decl) == FUNCTION_DECL) | |
6979 && DECL_RTL_SET_P (decl)) | |
6980 make_decl_rtl (decl); | |
6981 } | |
6982 } | |
6983 return false; | |
6984 } | |
6985 | |
6986 /* Handle an "tls_model" attribute; arguments as in | |
6987 struct attribute_spec.handler. */ | |
6988 | |
6989 static tree | |
6990 handle_tls_model_attribute (tree *node, tree name, tree args, | |
6991 int ARG_UNUSED (flags), bool *no_add_attrs) | |
6992 { | |
6993 tree id; | |
6994 tree decl = *node; | |
6995 enum tls_model kind; | |
6996 | |
6997 *no_add_attrs = true; | |
6998 | |
6999 if (TREE_CODE (decl) != VAR_DECL || !DECL_THREAD_LOCAL_P (decl)) | |
7000 { | |
7001 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
7002 return NULL_TREE; | |
7003 } | |
7004 | |
7005 kind = DECL_TLS_MODEL (decl); | |
7006 id = TREE_VALUE (args); | |
7007 if (TREE_CODE (id) != STRING_CST) | |
7008 { | |
7009 error ("tls_model argument not a string"); | |
7010 return NULL_TREE; | |
7011 } | |
7012 | |
7013 if (!strcmp (TREE_STRING_POINTER (id), "local-exec")) | |
7014 kind = TLS_MODEL_LOCAL_EXEC; | |
7015 else if (!strcmp (TREE_STRING_POINTER (id), "initial-exec")) | |
7016 kind = TLS_MODEL_INITIAL_EXEC; | |
7017 else if (!strcmp (TREE_STRING_POINTER (id), "local-dynamic")) | |
7018 kind = optimize ? TLS_MODEL_LOCAL_DYNAMIC : TLS_MODEL_GLOBAL_DYNAMIC; | |
7019 else if (!strcmp (TREE_STRING_POINTER (id), "global-dynamic")) | |
7020 kind = TLS_MODEL_GLOBAL_DYNAMIC; | |
7021 else | |
7022 error ("tls_model argument must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\""); | |
7023 | |
7024 DECL_TLS_MODEL (decl) = kind; | |
7025 return NULL_TREE; | |
7026 } | |
7027 | |
7028 /* Handle a "no_instrument_function" attribute; arguments as in | |
7029 struct attribute_spec.handler. */ | |
7030 | |
7031 static tree | |
7032 handle_no_instrument_function_attribute (tree *node, tree name, | |
7033 tree ARG_UNUSED (args), | |
7034 int ARG_UNUSED (flags), | |
7035 bool *no_add_attrs) | |
7036 { | |
7037 tree decl = *node; | |
7038 | |
7039 if (TREE_CODE (decl) != FUNCTION_DECL) | |
7040 { | |
7041 error_at (DECL_SOURCE_LOCATION (decl), | |
7042 "%qE attribute applies only to functions", name); | |
7043 *no_add_attrs = true; | |
7044 } | |
7045 else if (DECL_INITIAL (decl)) | |
7046 { | |
7047 error_at (DECL_SOURCE_LOCATION (decl), | |
7048 "can%'t set %qE attribute after definition", name); | |
7049 *no_add_attrs = true; | |
7050 } | |
7051 else | |
7052 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1; | |
7053 | |
7054 return NULL_TREE; | |
7055 } | |
7056 | |
7057 /* Handle a "malloc" attribute; arguments as in | |
7058 struct attribute_spec.handler. */ | |
7059 | |
7060 static tree | |
7061 handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
7062 int ARG_UNUSED (flags), bool *no_add_attrs) | |
7063 { | |
7064 if (TREE_CODE (*node) == FUNCTION_DECL | |
7065 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node)))) | |
7066 DECL_IS_MALLOC (*node) = 1; | |
7067 else | |
7068 { | |
7069 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
7070 *no_add_attrs = true; | |
7071 } | |
7072 | |
7073 return NULL_TREE; | |
7074 } | |
7075 | |
7076 /* Handle a "alloc_size" attribute; arguments as in | |
7077 struct attribute_spec.handler. */ | |
7078 | |
7079 static tree | |
7080 handle_alloc_size_attribute (tree *node, tree ARG_UNUSED (name), tree args, | |
7081 int ARG_UNUSED (flags), bool *no_add_attrs) | |
7082 { | |
7083 unsigned arg_count = type_num_arguments (*node); | |
7084 for (; args; args = TREE_CHAIN (args)) | |
7085 { | |
7086 tree position = TREE_VALUE (args); | |
7087 | |
7088 if (TREE_CODE (position) != INTEGER_CST | |
7089 || TREE_INT_CST_HIGH (position) | |
7090 || TREE_INT_CST_LOW (position) < 1 | |
7091 || TREE_INT_CST_LOW (position) > arg_count ) | |
7092 { | |
7093 warning (OPT_Wattributes, | |
7094 "alloc_size parameter outside range"); | |
7095 *no_add_attrs = true; | |
7096 return NULL_TREE; | |
7097 } | |
7098 } | |
7099 return NULL_TREE; | |
7100 } | |
7101 | |
7102 /* Handle a "fn spec" attribute; arguments as in | |
7103 struct attribute_spec.handler. */ | |
7104 | |
7105 static tree | |
7106 handle_fnspec_attribute (tree *node ATTRIBUTE_UNUSED, tree ARG_UNUSED (name), | |
7107 tree args, int ARG_UNUSED (flags), | |
7108 bool *no_add_attrs ATTRIBUTE_UNUSED) | |
7109 { | |
7110 gcc_assert (args | |
7111 && TREE_CODE (TREE_VALUE (args)) == STRING_CST | |
7112 && !TREE_CHAIN (args)); | |
7113 return NULL_TREE; | |
7114 } | |
7115 | |
7116 /* Handle a "returns_twice" attribute; arguments as in | |
7117 struct attribute_spec.handler. */ | |
7118 | |
7119 static tree | |
7120 handle_returns_twice_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
7121 int ARG_UNUSED (flags), bool *no_add_attrs) | |
7122 { | |
7123 if (TREE_CODE (*node) == FUNCTION_DECL) | |
7124 DECL_IS_RETURNS_TWICE (*node) = 1; | |
7125 else | |
7126 { | |
7127 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
7128 *no_add_attrs = true; | |
7129 } | |
7130 | |
7131 return NULL_TREE; | |
7132 } | |
7133 | |
7134 /* Handle a "no_limit_stack" attribute; arguments as in | |
7135 struct attribute_spec.handler. */ | |
7136 | |
7137 static tree | |
7138 handle_no_limit_stack_attribute (tree *node, tree name, | |
7139 tree ARG_UNUSED (args), | |
7140 int ARG_UNUSED (flags), | |
7141 bool *no_add_attrs) | |
7142 { | |
7143 tree decl = *node; | |
7144 | |
7145 if (TREE_CODE (decl) != FUNCTION_DECL) | |
7146 { | |
7147 error_at (DECL_SOURCE_LOCATION (decl), | |
7148 "%qE attribute applies only to functions", name); | |
7149 *no_add_attrs = true; | |
7150 } | |
7151 else if (DECL_INITIAL (decl)) | |
7152 { | |
7153 error_at (DECL_SOURCE_LOCATION (decl), | |
7154 "can%'t set %qE attribute after definition", name); | |
7155 *no_add_attrs = true; | |
7156 } | |
7157 else | |
7158 DECL_NO_LIMIT_STACK (decl) = 1; | |
7159 | |
7160 return NULL_TREE; | |
7161 } | |
7162 | |
7163 /* Handle a "pure" attribute; arguments as in | |
7164 struct attribute_spec.handler. */ | |
7165 | |
7166 static tree | |
7167 handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
7168 int ARG_UNUSED (flags), bool *no_add_attrs) | |
7169 { | |
7170 if (TREE_CODE (*node) == FUNCTION_DECL) | |
7171 DECL_PURE_P (*node) = 1; | |
7172 /* ??? TODO: Support types. */ | |
7173 else | |
7174 { | |
7175 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
7176 *no_add_attrs = true; | |
7177 } | |
7178 | |
7179 return NULL_TREE; | |
7180 } | |
7181 | |
7182 /* Handle a "no vops" attribute; arguments as in | |
7183 struct attribute_spec.handler. */ | |
7184 | |
7185 static tree | |
7186 handle_novops_attribute (tree *node, tree ARG_UNUSED (name), | |
7187 tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
7188 bool *ARG_UNUSED (no_add_attrs)) | |
7189 { | |
7190 gcc_assert (TREE_CODE (*node) == FUNCTION_DECL); | |
7191 DECL_IS_NOVOPS (*node) = 1; | |
7192 return NULL_TREE; | |
7193 } | |
7194 | |
7195 /* Handle a "deprecated" attribute; arguments as in | |
7196 struct attribute_spec.handler. */ | |
7197 | |
7198 static tree | |
7199 handle_deprecated_attribute (tree *node, tree name, | |
7200 tree args, int flags, | |
7201 bool *no_add_attrs) | |
7202 { | |
7203 tree type = NULL_TREE; | |
7204 int warn = 0; | |
7205 tree what = NULL_TREE; | |
7206 | |
7207 if (!args) | |
7208 *no_add_attrs = true; | |
7209 else if (TREE_CODE (TREE_VALUE (args)) != STRING_CST) | |
7210 { | |
7211 error ("deprecated message is not a string"); | |
7212 *no_add_attrs = true; | |
7213 } | |
7214 | |
7215 if (DECL_P (*node)) | |
7216 { | |
7217 tree decl = *node; | |
7218 type = TREE_TYPE (decl); | |
7219 | |
7220 if (TREE_CODE (decl) == TYPE_DECL | |
7221 || TREE_CODE (decl) == PARM_DECL | |
7222 || TREE_CODE (decl) == VAR_DECL | |
7223 || TREE_CODE (decl) == FUNCTION_DECL | |
7224 || TREE_CODE (decl) == FIELD_DECL | |
7225 || objc_method_decl (TREE_CODE (decl))) | |
7226 TREE_DEPRECATED (decl) = 1; | |
7227 else | |
7228 warn = 1; | |
7229 } | |
7230 else if (TYPE_P (*node)) | |
7231 { | |
7232 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) | |
7233 *node = build_variant_type_copy (*node); | |
7234 TREE_DEPRECATED (*node) = 1; | |
7235 type = *node; | |
7236 } | |
7237 else | |
7238 warn = 1; | |
7239 | |
7240 if (warn) | |
7241 { | |
7242 *no_add_attrs = true; | |
7243 if (type && TYPE_NAME (type)) | |
7244 { | |
7245 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) | |
7246 what = TYPE_NAME (*node); | |
7247 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL | |
7248 && DECL_NAME (TYPE_NAME (type))) | |
7249 what = DECL_NAME (TYPE_NAME (type)); | |
7250 } | |
7251 if (what) | |
7252 warning (OPT_Wattributes, "%qE attribute ignored for %qE", name, what); | |
7253 else | |
7254 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
7255 } | |
7256 | |
7257 return NULL_TREE; | |
7258 } | |
7259 | |
7260 /* Handle a "vector_size" attribute; arguments as in | |
7261 struct attribute_spec.handler. */ | |
7262 | |
7263 static tree | |
7264 handle_vector_size_attribute (tree *node, tree name, tree args, | |
7265 int ARG_UNUSED (flags), | |
7266 bool *no_add_attrs) | |
7267 { | |
7268 unsigned HOST_WIDE_INT vecsize, nunits; | |
7269 enum machine_mode orig_mode; | |
7270 tree type = *node, new_type, size; | |
7271 | |
7272 *no_add_attrs = true; | |
7273 | |
7274 size = TREE_VALUE (args); | |
7275 | |
7276 if (!host_integerp (size, 1)) | |
7277 { | |
7278 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
7279 return NULL_TREE; | |
7280 } | |
7281 | |
7282 /* Get the vector size (in bytes). */ | |
7283 vecsize = tree_low_cst (size, 1); | |
7284 | |
7285 /* We need to provide for vector pointers, vector arrays, and | |
7286 functions returning vectors. For example: | |
7287 | |
7288 __attribute__((vector_size(16))) short *foo; | |
7289 | |
7290 In this case, the mode is SI, but the type being modified is | |
7291 HI, so we need to look further. */ | |
7292 | |
7293 while (POINTER_TYPE_P (type) | |
7294 || TREE_CODE (type) == FUNCTION_TYPE | |
7295 || TREE_CODE (type) == METHOD_TYPE | |
7296 || TREE_CODE (type) == ARRAY_TYPE | |
7297 || TREE_CODE (type) == OFFSET_TYPE) | |
7298 type = TREE_TYPE (type); | |
7299 | |
7300 /* Get the mode of the type being modified. */ | |
7301 orig_mode = TYPE_MODE (type); | |
7302 | |
7303 if ((!INTEGRAL_TYPE_P (type) | |
7304 && !SCALAR_FLOAT_TYPE_P (type) | |
7305 && !FIXED_POINT_TYPE_P (type)) | |
7306 || (!SCALAR_FLOAT_MODE_P (orig_mode) | |
7307 && GET_MODE_CLASS (orig_mode) != MODE_INT | |
7308 && !ALL_SCALAR_FIXED_POINT_MODE_P (orig_mode)) | |
7309 || !host_integerp (TYPE_SIZE_UNIT (type), 1) | |
7310 || TREE_CODE (type) == BOOLEAN_TYPE) | |
7311 { | |
7312 error ("invalid vector type for attribute %qE", name); | |
7313 return NULL_TREE; | |
7314 } | |
7315 | |
7316 if (vecsize % tree_low_cst (TYPE_SIZE_UNIT (type), 1)) | |
7317 { | |
7318 error ("vector size not an integral multiple of component size"); | |
7319 return NULL; | |
7320 } | |
7321 | |
7322 if (vecsize == 0) | |
7323 { | |
7324 error ("zero vector size"); | |
7325 return NULL; | |
7326 } | |
7327 | |
7328 /* Calculate how many units fit in the vector. */ | |
7329 nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1); | |
7330 if (nunits & (nunits - 1)) | |
7331 { | |
7332 error ("number of components of the vector not a power of two"); | |
7333 return NULL_TREE; | |
7334 } | |
7335 | |
7336 new_type = build_vector_type (type, nunits); | |
7337 | |
7338 /* Build back pointers if needed. */ | |
7339 *node = lang_hooks.types.reconstruct_complex_type (*node, new_type); | |
7340 | |
7341 return NULL_TREE; | |
7342 } | |
7343 | |
7344 /* Handle the "nonnull" attribute. */ | |
7345 static tree | |
7346 handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name), | |
7347 tree args, int ARG_UNUSED (flags), | |
7348 bool *no_add_attrs) | |
7349 { | |
7350 tree type = *node; | |
7351 unsigned HOST_WIDE_INT attr_arg_num; | |
7352 | |
7353 /* If no arguments are specified, all pointer arguments should be | |
7354 non-null. Verify a full prototype is given so that the arguments | |
7355 will have the correct types when we actually check them later. */ | |
7356 if (!args) | |
7357 { | |
7358 if (!prototype_p (type)) | |
7359 { | |
7360 error ("nonnull attribute without arguments on a non-prototype"); | |
7361 *no_add_attrs = true; | |
7362 } | |
7363 return NULL_TREE; | |
7364 } | |
7365 | |
7366 /* Argument list specified. Verify that each argument number references | |
7367 a pointer argument. */ | |
7368 for (attr_arg_num = 1; args; args = TREE_CHAIN (args)) | |
7369 { | |
7370 tree argument; | |
7371 unsigned HOST_WIDE_INT arg_num = 0, ck_num; | |
7372 | |
7373 if (!get_nonnull_operand (TREE_VALUE (args), &arg_num)) | |
7374 { | |
7375 error ("nonnull argument has invalid operand number (argument %lu)", | |
7376 (unsigned long) attr_arg_num); | |
7377 *no_add_attrs = true; | |
7378 return NULL_TREE; | |
7379 } | |
7380 | |
7381 argument = TYPE_ARG_TYPES (type); | |
7382 if (argument) | |
7383 { | |
7384 for (ck_num = 1; ; ck_num++) | |
7385 { | |
7386 if (!argument || ck_num == arg_num) | |
7387 break; | |
7388 argument = TREE_CHAIN (argument); | |
7389 } | |
7390 | |
7391 if (!argument | |
7392 || TREE_CODE (TREE_VALUE (argument)) == VOID_TYPE) | |
7393 { | |
7394 error ("nonnull argument with out-of-range operand number (argument %lu, operand %lu)", | |
7395 (unsigned long) attr_arg_num, (unsigned long) arg_num); | |
7396 *no_add_attrs = true; | |
7397 return NULL_TREE; | |
7398 } | |
7399 | |
7400 if (TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE) | |
7401 { | |
7402 error ("nonnull argument references non-pointer operand (argument %lu, operand %lu)", | |
7403 (unsigned long) attr_arg_num, (unsigned long) arg_num); | |
7404 *no_add_attrs = true; | |
7405 return NULL_TREE; | |
7406 } | |
7407 } | |
7408 } | |
7409 | |
7410 return NULL_TREE; | |
7411 } | |
7412 | |
7413 /* Check the argument list of a function call for null in argument slots | |
7414 that are marked as requiring a non-null pointer argument. The NARGS | |
7415 arguments are passed in the array ARGARRAY. | |
7416 */ | |
7417 | |
7418 static void | |
7419 check_function_nonnull (tree attrs, int nargs, tree *argarray) | |
7420 { | |
7421 tree a, args; | |
7422 int i; | |
7423 | |
7424 for (a = attrs; a; a = TREE_CHAIN (a)) | |
7425 { | |
7426 if (is_attribute_p ("nonnull", TREE_PURPOSE (a))) | |
7427 { | |
7428 args = TREE_VALUE (a); | |
7429 | |
7430 /* Walk the argument list. If we encounter an argument number we | |
7431 should check for non-null, do it. If the attribute has no args, | |
7432 then every pointer argument is checked (in which case the check | |
7433 for pointer type is done in check_nonnull_arg). */ | |
7434 for (i = 0; i < nargs; i++) | |
7435 { | |
7436 if (!args || nonnull_check_p (args, i + 1)) | |
7437 check_function_arguments_recurse (check_nonnull_arg, NULL, | |
7438 argarray[i], | |
7439 i + 1); | |
7440 } | |
7441 } | |
7442 } | |
7443 } | |
7444 | |
7445 /* Check that the Nth argument of a function call (counting backwards | |
7446 from the end) is a (pointer)0. The NARGS arguments are passed in the | |
7447 array ARGARRAY. */ | |
7448 | |
7449 static void | |
7450 check_function_sentinel (tree attrs, int nargs, tree *argarray, tree typelist) | |
7451 { | |
7452 tree attr = lookup_attribute ("sentinel", attrs); | |
7453 | |
7454 if (attr) | |
7455 { | |
7456 int len = 0; | |
7457 int pos = 0; | |
7458 tree sentinel; | |
7459 | |
7460 /* Skip over the named arguments. */ | |
7461 while (typelist && len < nargs) | |
7462 { | |
7463 typelist = TREE_CHAIN (typelist); | |
7464 len++; | |
7465 } | |
7466 | |
7467 if (TREE_VALUE (attr)) | |
7468 { | |
7469 tree p = TREE_VALUE (TREE_VALUE (attr)); | |
7470 pos = TREE_INT_CST_LOW (p); | |
7471 } | |
7472 | |
7473 /* The sentinel must be one of the varargs, i.e. | |
7474 in position >= the number of fixed arguments. */ | |
7475 if ((nargs - 1 - pos) < len) | |
7476 { | |
7477 warning (OPT_Wformat, | |
7478 "not enough variable arguments to fit a sentinel"); | |
7479 return; | |
7480 } | |
7481 | |
7482 /* Validate the sentinel. */ | |
7483 sentinel = argarray[nargs - 1 - pos]; | |
7484 if ((!POINTER_TYPE_P (TREE_TYPE (sentinel)) | |
7485 || !integer_zerop (sentinel)) | |
7486 /* Although __null (in C++) is only an integer we allow it | |
7487 nevertheless, as we are guaranteed that it's exactly | |
7488 as wide as a pointer, and we don't want to force | |
7489 users to cast the NULL they have written there. | |
7490 We warn with -Wstrict-null-sentinel, though. */ | |
7491 && (warn_strict_null_sentinel || null_node != sentinel)) | |
7492 warning (OPT_Wformat, "missing sentinel in function call"); | |
7493 } | |
7494 } | |
7495 | |
7496 /* Helper for check_function_nonnull; given a list of operands which | |
7497 must be non-null in ARGS, determine if operand PARAM_NUM should be | |
7498 checked. */ | |
7499 | |
7500 static bool | |
7501 nonnull_check_p (tree args, unsigned HOST_WIDE_INT param_num) | |
7502 { | |
7503 unsigned HOST_WIDE_INT arg_num = 0; | |
7504 | |
7505 for (; args; args = TREE_CHAIN (args)) | |
7506 { | |
7507 bool found = get_nonnull_operand (TREE_VALUE (args), &arg_num); | |
7508 | |
7509 gcc_assert (found); | |
7510 | |
7511 if (arg_num == param_num) | |
7512 return true; | |
7513 } | |
7514 return false; | |
7515 } | |
7516 | |
7517 /* Check that the function argument PARAM (which is operand number | |
7518 PARAM_NUM) is non-null. This is called by check_function_nonnull | |
7519 via check_function_arguments_recurse. */ | |
7520 | |
7521 static void | |
7522 check_nonnull_arg (void * ARG_UNUSED (ctx), tree param, | |
7523 unsigned HOST_WIDE_INT param_num) | |
7524 { | |
7525 /* Just skip checking the argument if it's not a pointer. This can | |
7526 happen if the "nonnull" attribute was given without an operand | |
7527 list (which means to check every pointer argument). */ | |
7528 | |
7529 if (TREE_CODE (TREE_TYPE (param)) != POINTER_TYPE) | |
7530 return; | |
7531 | |
7532 if (integer_zerop (param)) | |
7533 warning (OPT_Wnonnull, "null argument where non-null required " | |
7534 "(argument %lu)", (unsigned long) param_num); | |
7535 } | |
7536 | |
7537 /* Helper for nonnull attribute handling; fetch the operand number | |
7538 from the attribute argument list. */ | |
7539 | |
7540 static bool | |
7541 get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp) | |
7542 { | |
7543 /* Verify the arg number is a constant. */ | |
7544 if (TREE_CODE (arg_num_expr) != INTEGER_CST | |
7545 || TREE_INT_CST_HIGH (arg_num_expr) != 0) | |
7546 return false; | |
7547 | |
7548 *valp = TREE_INT_CST_LOW (arg_num_expr); | |
7549 return true; | |
7550 } | |
7551 | |
7552 /* Handle a "nothrow" attribute; arguments as in | |
7553 struct attribute_spec.handler. */ | |
7554 | |
7555 static tree | |
7556 handle_nothrow_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
7557 int ARG_UNUSED (flags), bool *no_add_attrs) | |
7558 { | |
7559 if (TREE_CODE (*node) == FUNCTION_DECL) | |
7560 TREE_NOTHROW (*node) = 1; | |
7561 /* ??? TODO: Support types. */ | |
7562 else | |
7563 { | |
7564 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
7565 *no_add_attrs = true; | |
7566 } | |
7567 | |
7568 return NULL_TREE; | |
7569 } | |
7570 | |
7571 /* Handle a "cleanup" attribute; arguments as in | |
7572 struct attribute_spec.handler. */ | |
7573 | |
7574 static tree | |
7575 handle_cleanup_attribute (tree *node, tree name, tree args, | |
7576 int ARG_UNUSED (flags), bool *no_add_attrs) | |
7577 { | |
7578 tree decl = *node; | |
7579 tree cleanup_id, cleanup_decl; | |
7580 | |
7581 /* ??? Could perhaps support cleanups on TREE_STATIC, much like we do | |
7582 for global destructors in C++. This requires infrastructure that | |
7583 we don't have generically at the moment. It's also not a feature | |
7584 we'd be missing too much, since we do have attribute constructor. */ | |
7585 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)) | |
7586 { | |
7587 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
7588 *no_add_attrs = true; | |
7589 return NULL_TREE; | |
7590 } | |
7591 | |
7592 /* Verify that the argument is a function in scope. */ | |
7593 /* ??? We could support pointers to functions here as well, if | |
7594 that was considered desirable. */ | |
7595 cleanup_id = TREE_VALUE (args); | |
7596 if (TREE_CODE (cleanup_id) != IDENTIFIER_NODE) | |
7597 { | |
7598 error ("cleanup argument not an identifier"); | |
7599 *no_add_attrs = true; | |
7600 return NULL_TREE; | |
7601 } | |
7602 cleanup_decl = lookup_name (cleanup_id); | |
7603 if (!cleanup_decl || TREE_CODE (cleanup_decl) != FUNCTION_DECL) | |
7604 { | |
7605 error ("cleanup argument not a function"); | |
7606 *no_add_attrs = true; | |
7607 return NULL_TREE; | |
7608 } | |
7609 | |
7610 /* That the function has proper type is checked with the | |
7611 eventual call to build_function_call. */ | |
7612 | |
7613 return NULL_TREE; | |
7614 } | |
7615 | |
7616 /* Handle a "warn_unused_result" attribute. No special handling. */ | |
7617 | |
7618 static tree | |
7619 handle_warn_unused_result_attribute (tree *node, tree name, | |
7620 tree ARG_UNUSED (args), | |
7621 int ARG_UNUSED (flags), bool *no_add_attrs) | |
7622 { | |
7623 /* Ignore the attribute for functions not returning any value. */ | |
7624 if (VOID_TYPE_P (TREE_TYPE (*node))) | |
7625 { | |
7626 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
7627 *no_add_attrs = true; | |
7628 } | |
7629 | |
7630 return NULL_TREE; | |
7631 } | |
7632 | |
7633 /* Handle a "sentinel" attribute. */ | |
7634 | |
7635 static tree | |
7636 handle_sentinel_attribute (tree *node, tree name, tree args, | |
7637 int ARG_UNUSED (flags), bool *no_add_attrs) | |
7638 { | |
7639 tree params = TYPE_ARG_TYPES (*node); | |
7640 | |
7641 if (!prototype_p (*node)) | |
7642 { | |
7643 warning (OPT_Wattributes, | |
7644 "%qE attribute requires prototypes with named arguments", name); | |
7645 *no_add_attrs = true; | |
7646 } | |
7647 else | |
7648 { | |
7649 while (TREE_CHAIN (params)) | |
7650 params = TREE_CHAIN (params); | |
7651 | |
7652 if (VOID_TYPE_P (TREE_VALUE (params))) | |
7653 { | |
7654 warning (OPT_Wattributes, | |
7655 "%qE attribute only applies to variadic functions", name); | |
7656 *no_add_attrs = true; | |
7657 } | |
7658 } | |
7659 | |
7660 if (args) | |
7661 { | |
7662 tree position = TREE_VALUE (args); | |
7663 | |
7664 if (TREE_CODE (position) != INTEGER_CST) | |
7665 { | |
7666 warning (OPT_Wattributes, | |
7667 "requested position is not an integer constant"); | |
7668 *no_add_attrs = true; | |
7669 } | |
7670 else | |
7671 { | |
7672 if (tree_int_cst_lt (position, integer_zero_node)) | |
7673 { | |
7674 warning (OPT_Wattributes, | |
7675 "requested position is less than zero"); | |
7676 *no_add_attrs = true; | |
7677 } | |
7678 } | |
7679 } | |
7680 | |
7681 return NULL_TREE; | |
7682 } | |
7683 | |
7684 /* Handle a "type_generic" attribute. */ | |
7685 | |
7686 static tree | |
7687 handle_type_generic_attribute (tree *node, tree ARG_UNUSED (name), | |
7688 tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
7689 bool * ARG_UNUSED (no_add_attrs)) | |
7690 { | |
7691 tree params; | |
7692 | |
7693 /* Ensure we have a function type. */ | |
7694 gcc_assert (TREE_CODE (*node) == FUNCTION_TYPE); | |
7695 | |
7696 params = TYPE_ARG_TYPES (*node); | |
7697 while (params && ! VOID_TYPE_P (TREE_VALUE (params))) | |
7698 params = TREE_CHAIN (params); | |
7699 | |
7700 /* Ensure we have a variadic function. */ | |
7701 gcc_assert (!params); | |
7702 | |
7703 return NULL_TREE; | |
7704 } | |
7705 | |
7706 /* Handle a "target" attribute. */ | |
7707 | |
7708 static tree | |
7709 handle_target_attribute (tree *node, tree name, tree args, int flags, | |
7710 bool *no_add_attrs) | |
7711 { | |
7712 /* Ensure we have a function type. */ | |
7713 if (TREE_CODE (*node) != FUNCTION_DECL) | |
7714 { | |
7715 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
7716 *no_add_attrs = true; | |
7717 } | |
7718 else if (! targetm.target_option.valid_attribute_p (*node, name, args, | |
7719 flags)) | |
7720 *no_add_attrs = true; | |
7721 | |
7722 return NULL_TREE; | |
7723 } | |
7724 | |
7725 /* Arguments being collected for optimization. */ | |
7726 typedef const char *const_char_p; /* For DEF_VEC_P. */ | |
7727 DEF_VEC_P(const_char_p); | |
7728 DEF_VEC_ALLOC_P(const_char_p, gc); | |
7729 static GTY(()) VEC(const_char_p, gc) *optimize_args; | |
7730 | |
7731 | |
7732 /* Inner function to convert a TREE_LIST to argv string to parse the optimize | |
7733 options in ARGS. ATTR_P is true if this is for attribute(optimize), and | |
7734 false for #pragma GCC optimize. */ | |
7735 | |
7736 bool | |
7737 parse_optimize_options (tree args, bool attr_p) | |
7738 { | |
7739 bool ret = true; | |
7740 unsigned opt_argc; | |
7741 unsigned i; | |
7742 int saved_flag_strict_aliasing; | |
7743 const char **opt_argv; | |
7744 struct cl_decoded_option *decoded_options; | |
7745 unsigned int decoded_options_count; | |
7746 tree ap; | |
7747 | |
7748 /* Build up argv vector. Just in case the string is stored away, use garbage | |
7749 collected strings. */ | |
7750 VEC_truncate (const_char_p, optimize_args, 0); | |
7751 VEC_safe_push (const_char_p, gc, optimize_args, NULL); | |
7752 | |
7753 for (ap = args; ap != NULL_TREE; ap = TREE_CHAIN (ap)) | |
7754 { | |
7755 tree value = TREE_VALUE (ap); | |
7756 | |
7757 if (TREE_CODE (value) == INTEGER_CST) | |
7758 { | |
7759 char buffer[20]; | |
7760 sprintf (buffer, "-O%ld", (long) TREE_INT_CST_LOW (value)); | |
7761 VEC_safe_push (const_char_p, gc, optimize_args, ggc_strdup (buffer)); | |
7762 } | |
7763 | |
7764 else if (TREE_CODE (value) == STRING_CST) | |
7765 { | |
7766 /* Split string into multiple substrings. */ | |
7767 size_t len = TREE_STRING_LENGTH (value); | |
7768 char *p = ASTRDUP (TREE_STRING_POINTER (value)); | |
7769 char *end = p + len; | |
7770 char *comma; | |
7771 char *next_p = p; | |
7772 | |
7773 while (next_p != NULL) | |
7774 { | |
7775 size_t len2; | |
7776 char *q, *r; | |
7777 | |
7778 p = next_p; | |
7779 comma = strchr (p, ','); | |
7780 if (comma) | |
7781 { | |
7782 len2 = comma - p; | |
7783 *comma = '\0'; | |
7784 next_p = comma+1; | |
7785 } | |
7786 else | |
7787 { | |
7788 len2 = end - p; | |
7789 next_p = NULL; | |
7790 } | |
7791 | |
7792 r = q = (char *) ggc_alloc_atomic (len2 + 3); | |
7793 | |
7794 /* If the user supplied -Oxxx or -fxxx, only allow -Oxxx or -fxxx | |
7795 options. */ | |
7796 if (*p == '-' && p[1] != 'O' && p[1] != 'f') | |
7797 { | |
7798 ret = false; | |
7799 if (attr_p) | |
7800 warning (OPT_Wattributes, | |
7801 "bad option %s to optimize attribute", p); | |
7802 else | |
7803 warning (OPT_Wpragmas, | |
7804 "bad option %s to pragma attribute", p); | |
7805 continue; | |
7806 } | |
7807 | |
7808 if (*p != '-') | |
7809 { | |
7810 *r++ = '-'; | |
7811 | |
7812 /* Assume that Ox is -Ox, a numeric value is -Ox, a s by | |
7813 itself is -Os, and any other switch begins with a -f. */ | |
7814 if ((*p >= '0' && *p <= '9') | |
7815 || (p[0] == 's' && p[1] == '\0')) | |
7816 *r++ = 'O'; | |
7817 else if (*p != 'O') | |
7818 *r++ = 'f'; | |
7819 } | |
7820 | |
7821 memcpy (r, p, len2); | |
7822 r[len2] = '\0'; | |
7823 VEC_safe_push (const_char_p, gc, optimize_args, q); | |
7824 } | |
7825 | |
7826 } | |
7827 } | |
7828 | |
7829 opt_argc = VEC_length (const_char_p, optimize_args); | |
7830 opt_argv = (const char **) alloca (sizeof (char *) * (opt_argc + 1)); | |
7831 | |
7832 for (i = 1; i < opt_argc; i++) | |
7833 opt_argv[i] = VEC_index (const_char_p, optimize_args, i); | |
7834 | |
7835 saved_flag_strict_aliasing = flag_strict_aliasing; | |
7836 | |
7837 /* Now parse the options. */ | |
7838 decode_cmdline_options_to_array_default_mask (opt_argc, opt_argv, | |
7839 &decoded_options, | |
7840 &decoded_options_count); | |
7841 decode_options (&global_options, &global_options_set, | |
7842 decoded_options, decoded_options_count, | |
7843 input_location, global_dc); | |
7844 | |
7845 targetm.override_options_after_change(); | |
7846 | |
7847 /* Don't allow changing -fstrict-aliasing. */ | |
7848 flag_strict_aliasing = saved_flag_strict_aliasing; | |
7849 | |
7850 VEC_truncate (const_char_p, optimize_args, 0); | |
7851 return ret; | |
7852 } | |
7853 | |
7854 /* For handling "optimize" attribute. arguments as in | |
7855 struct attribute_spec.handler. */ | |
7856 | |
7857 static tree | |
7858 handle_optimize_attribute (tree *node, tree name, tree args, | |
7859 int ARG_UNUSED (flags), bool *no_add_attrs) | |
7860 { | |
7861 /* Ensure we have a function type. */ | |
7862 if (TREE_CODE (*node) != FUNCTION_DECL) | |
7863 { | |
7864 warning (OPT_Wattributes, "%qE attribute ignored", name); | |
7865 *no_add_attrs = true; | |
7866 } | |
7867 else | |
7868 { | |
7869 struct cl_optimization cur_opts; | |
7870 tree old_opts = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node); | |
7871 | |
7872 /* Save current options. */ | |
7873 cl_optimization_save (&cur_opts, &global_options); | |
7874 | |
7875 /* If we previously had some optimization options, use them as the | |
7876 default. */ | |
7877 if (old_opts) | |
7878 cl_optimization_restore (&global_options, | |
7879 TREE_OPTIMIZATION (old_opts)); | |
7880 | |
7881 /* Parse options, and update the vector. */ | |
7882 parse_optimize_options (args, true); | |
7883 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node) | |
7884 = build_optimization_node (); | |
7885 | |
7886 /* Restore current options. */ | |
7887 cl_optimization_restore (&global_options, &cur_opts); | |
7888 } | |
7889 | |
7890 return NULL_TREE; | |
7891 } | |
7892 | |
7893 /* Handle a "no_split_stack" attribute. */ | |
7894 | |
7895 static tree | |
7896 handle_no_split_stack_attribute (tree *node, tree name, | |
7897 tree ARG_UNUSED (args), | |
7898 int ARG_UNUSED (flags), | |
7899 bool *no_add_attrs) | |
7900 { | |
7901 tree decl = *node; | |
7902 | |
7903 if (TREE_CODE (decl) != FUNCTION_DECL) | |
7904 { | |
7905 error_at (DECL_SOURCE_LOCATION (decl), | |
7906 "%qE attribute applies only to functions", name); | |
7907 *no_add_attrs = true; | |
7908 } | |
7909 else if (DECL_INITIAL (decl)) | |
7910 { | |
7911 error_at (DECL_SOURCE_LOCATION (decl), | |
7912 "can%'t set %qE attribute after definition", name); | |
7913 *no_add_attrs = true; | |
7914 } | |
7915 | |
7916 return NULL_TREE; | |
7917 } | |
7918 | |
7919 /* Check for valid arguments being passed to a function. | |
7920 ATTRS is a list of attributes. There are NARGS arguments in the array | |
7921 ARGARRAY. TYPELIST is the list of argument types for the function. | |
7922 */ | |
7923 void | |
7924 check_function_arguments (tree attrs, int nargs, tree *argarray, tree typelist) | |
7925 { | |
7926 /* Check for null being passed in a pointer argument that must be | |
7927 non-null. We also need to do this if format checking is enabled. */ | |
7928 | |
7929 if (warn_nonnull) | |
7930 check_function_nonnull (attrs, nargs, argarray); | |
7931 | |
7932 /* Check for errors in format strings. */ | |
7933 | |
7934 if (warn_format || warn_missing_format_attribute) | |
7935 check_function_format (attrs, nargs, argarray); | |
7936 | |
7937 if (warn_format) | |
7938 check_function_sentinel (attrs, nargs, argarray, typelist); | |
7939 } | |
7940 | |
7941 /* Generic argument checking recursion routine. PARAM is the argument to | |
7942 be checked. PARAM_NUM is the number of the argument. CALLBACK is invoked | |
7943 once the argument is resolved. CTX is context for the callback. */ | |
7944 void | |
7945 check_function_arguments_recurse (void (*callback) | |
7946 (void *, tree, unsigned HOST_WIDE_INT), | |
7947 void *ctx, tree param, | |
7948 unsigned HOST_WIDE_INT param_num) | |
7949 { | |
7950 if (CONVERT_EXPR_P (param) | |
7951 && (TYPE_PRECISION (TREE_TYPE (param)) | |
7952 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (param, 0))))) | |
7953 { | |
7954 /* Strip coercion. */ | |
7955 check_function_arguments_recurse (callback, ctx, | |
7956 TREE_OPERAND (param, 0), param_num); | |
7957 return; | |
7958 } | |
7959 | |
7960 if (TREE_CODE (param) == CALL_EXPR) | |
7961 { | |
7962 tree type = TREE_TYPE (TREE_TYPE (CALL_EXPR_FN (param))); | |
7963 tree attrs; | |
7964 bool found_format_arg = false; | |
7965 | |
7966 /* See if this is a call to a known internationalization function | |
7967 that modifies a format arg. Such a function may have multiple | |
7968 format_arg attributes (for example, ngettext). */ | |
7969 | |
7970 for (attrs = TYPE_ATTRIBUTES (type); | |
7971 attrs; | |
7972 attrs = TREE_CHAIN (attrs)) | |
7973 if (is_attribute_p ("format_arg", TREE_PURPOSE (attrs))) | |
7974 { | |
7975 tree inner_arg; | |
7976 tree format_num_expr; | |
7977 int format_num; | |
7978 int i; | |
7979 call_expr_arg_iterator iter; | |
7980 | |
7981 /* Extract the argument number, which was previously checked | |
7982 to be valid. */ | |
7983 format_num_expr = TREE_VALUE (TREE_VALUE (attrs)); | |
7984 | |
7985 gcc_assert (TREE_CODE (format_num_expr) == INTEGER_CST | |
7986 && !TREE_INT_CST_HIGH (format_num_expr)); | |
7987 | |
7988 format_num = TREE_INT_CST_LOW (format_num_expr); | |
7989 | |
7990 for (inner_arg = first_call_expr_arg (param, &iter), i = 1; | |
7991 inner_arg != 0; | |
7992 inner_arg = next_call_expr_arg (&iter), i++) | |
7993 if (i == format_num) | |
7994 { | |
7995 check_function_arguments_recurse (callback, ctx, | |
7996 inner_arg, param_num); | |
7997 found_format_arg = true; | |
7998 break; | |
7999 } | |
8000 } | |
8001 | |
8002 /* If we found a format_arg attribute and did a recursive check, | |
8003 we are done with checking this argument. Otherwise, we continue | |
8004 and this will be considered a non-literal. */ | |
8005 if (found_format_arg) | |
8006 return; | |
8007 } | |
8008 | |
8009 if (TREE_CODE (param) == COND_EXPR) | |
8010 { | |
8011 /* Check both halves of the conditional expression. */ | |
8012 check_function_arguments_recurse (callback, ctx, | |
8013 TREE_OPERAND (param, 1), param_num); | |
8014 check_function_arguments_recurse (callback, ctx, | |
8015 TREE_OPERAND (param, 2), param_num); | |
8016 return; | |
8017 } | |
8018 | |
8019 (*callback) (ctx, param, param_num); | |
8020 } | |
8021 | |
8022 /* Checks for a builtin function FNDECL that the number of arguments | |
8023 NARGS against the required number REQUIRED and issues an error if | |
8024 there is a mismatch. Returns true if the number of arguments is | |
8025 correct, otherwise false. */ | |
8026 | |
8027 static bool | |
8028 builtin_function_validate_nargs (tree fndecl, int nargs, int required) | |
8029 { | |
8030 if (nargs < required) | |
8031 { | |
8032 error_at (input_location, | |
8033 "not enough arguments to function %qE", fndecl); | |
8034 return false; | |
8035 } | |
8036 else if (nargs > required) | |
8037 { | |
8038 error_at (input_location, | |
8039 "too many arguments to function %qE", fndecl); | |
8040 return false; | |
8041 } | |
8042 return true; | |
8043 } | |
8044 | |
8045 /* Verifies the NARGS arguments ARGS to the builtin function FNDECL. | |
8046 Returns false if there was an error, otherwise true. */ | |
8047 | |
8048 bool | |
8049 check_builtin_function_arguments (tree fndecl, int nargs, tree *args) | |
8050 { | |
8051 if (!DECL_BUILT_IN (fndecl) | |
8052 || DECL_BUILT_IN_CLASS (fndecl) != BUILT_IN_NORMAL) | |
8053 return true; | |
8054 | |
8055 switch (DECL_FUNCTION_CODE (fndecl)) | |
8056 { | |
8057 case BUILT_IN_CONSTANT_P: | |
8058 return builtin_function_validate_nargs (fndecl, nargs, 1); | |
8059 | |
8060 case BUILT_IN_ISFINITE: | |
8061 case BUILT_IN_ISINF: | |
8062 case BUILT_IN_ISINF_SIGN: | |
8063 case BUILT_IN_ISNAN: | |
8064 case BUILT_IN_ISNORMAL: | |
8065 if (builtin_function_validate_nargs (fndecl, nargs, 1)) | |
8066 { | |
8067 if (TREE_CODE (TREE_TYPE (args[0])) != REAL_TYPE) | |
8068 { | |
8069 error ("non-floating-point argument in call to " | |
8070 "function %qE", fndecl); | |
8071 return false; | |
8072 } | |
8073 return true; | |
8074 } | |
8075 return false; | |
8076 | |
8077 case BUILT_IN_ISGREATER: | |
8078 case BUILT_IN_ISGREATEREQUAL: | |
8079 case BUILT_IN_ISLESS: | |
8080 case BUILT_IN_ISLESSEQUAL: | |
8081 case BUILT_IN_ISLESSGREATER: | |
8082 case BUILT_IN_ISUNORDERED: | |
8083 if (builtin_function_validate_nargs (fndecl, nargs, 2)) | |
8084 { | |
8085 enum tree_code code0, code1; | |
8086 code0 = TREE_CODE (TREE_TYPE (args[0])); | |
8087 code1 = TREE_CODE (TREE_TYPE (args[1])); | |
8088 if (!((code0 == REAL_TYPE && code1 == REAL_TYPE) | |
8089 || (code0 == REAL_TYPE && code1 == INTEGER_TYPE) | |
8090 || (code0 == INTEGER_TYPE && code1 == REAL_TYPE))) | |
8091 { | |
8092 error ("non-floating-point arguments in call to " | |
8093 "function %qE", fndecl); | |
8094 return false; | |
8095 } | |
8096 return true; | |
8097 } | |
8098 return false; | |
8099 | |
8100 case BUILT_IN_FPCLASSIFY: | |
8101 if (builtin_function_validate_nargs (fndecl, nargs, 6)) | |
8102 { | |
8103 unsigned i; | |
8104 | |
8105 for (i=0; i<5; i++) | |
8106 if (TREE_CODE (args[i]) != INTEGER_CST) | |
8107 { | |
8108 error ("non-const integer argument %u in call to function %qE", | |
8109 i+1, fndecl); | |
8110 return false; | |
8111 } | |
8112 | |
8113 if (TREE_CODE (TREE_TYPE (args[5])) != REAL_TYPE) | |
8114 { | |
8115 error ("non-floating-point argument in call to function %qE", | |
8116 fndecl); | |
8117 return false; | |
8118 } | |
8119 return true; | |
8120 } | |
8121 return false; | |
8122 | |
8123 default: | |
8124 return true; | |
8125 } | |
8126 } | |
8127 | |
8128 /* Function to help qsort sort FIELD_DECLs by name order. */ | |
8129 | |
8130 int | |
8131 field_decl_cmp (const void *x_p, const void *y_p) | |
8132 { | |
8133 const tree *const x = (const tree *const) x_p; | |
8134 const tree *const y = (const tree *const) y_p; | |
8135 | |
8136 if (DECL_NAME (*x) == DECL_NAME (*y)) | |
8137 /* A nontype is "greater" than a type. */ | |
8138 return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL); | |
8139 if (DECL_NAME (*x) == NULL_TREE) | |
8140 return -1; | |
8141 if (DECL_NAME (*y) == NULL_TREE) | |
8142 return 1; | |
8143 if (DECL_NAME (*x) < DECL_NAME (*y)) | |
8144 return -1; | |
8145 return 1; | |
8146 } | |
8147 | |
8148 static struct { | |
8149 gt_pointer_operator new_value; | |
8150 void *cookie; | |
8151 } resort_data; | |
8152 | |
8153 /* This routine compares two fields like field_decl_cmp but using the | |
8154 pointer operator in resort_data. */ | |
8155 | |
8156 static int | |
8157 resort_field_decl_cmp (const void *x_p, const void *y_p) | |
8158 { | |
8159 const tree *const x = (const tree *const) x_p; | |
8160 const tree *const y = (const tree *const) y_p; | |
8161 | |
8162 if (DECL_NAME (*x) == DECL_NAME (*y)) | |
8163 /* A nontype is "greater" than a type. */ | |
8164 return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL); | |
8165 if (DECL_NAME (*x) == NULL_TREE) | |
8166 return -1; | |
8167 if (DECL_NAME (*y) == NULL_TREE) | |
8168 return 1; | |
8169 { | |
8170 tree d1 = DECL_NAME (*x); | |
8171 tree d2 = DECL_NAME (*y); | |
8172 resort_data.new_value (&d1, resort_data.cookie); | |
8173 resort_data.new_value (&d2, resort_data.cookie); | |
8174 if (d1 < d2) | |
8175 return -1; | |
8176 } | |
8177 return 1; | |
8178 } | |
8179 | |
8180 /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */ | |
8181 | |
8182 void | |
8183 resort_sorted_fields (void *obj, | |
8184 void * ARG_UNUSED (orig_obj), | |
8185 gt_pointer_operator new_value, | |
8186 void *cookie) | |
8187 { | |
8188 struct sorted_fields_type *sf = (struct sorted_fields_type *) obj; | |
8189 resort_data.new_value = new_value; | |
8190 resort_data.cookie = cookie; | |
8191 qsort (&sf->elts[0], sf->len, sizeof (tree), | |
8192 resort_field_decl_cmp); | |
8193 } | |
8194 | |
8195 /* Subroutine of c_parse_error. | |
8196 Return the result of concatenating LHS and RHS. RHS is really | |
8197 a string literal, its first character is indicated by RHS_START and | |
8198 RHS_SIZE is its length (including the terminating NUL character). | |
8199 | |
8200 The caller is responsible for deleting the returned pointer. */ | |
8201 | |
8202 static char * | |
8203 catenate_strings (const char *lhs, const char *rhs_start, int rhs_size) | |
8204 { | |
8205 const int lhs_size = strlen (lhs); | |
8206 char *result = XNEWVEC (char, lhs_size + rhs_size); | |
8207 strncpy (result, lhs, lhs_size); | |
8208 strncpy (result + lhs_size, rhs_start, rhs_size); | |
8209 return result; | |
8210 } | |
8211 | |
8212 /* Issue the error given by GMSGID, indicating that it occurred before | |
8213 TOKEN, which had the associated VALUE. */ | |
8214 | |
8215 void | |
8216 c_parse_error (const char *gmsgid, enum cpp_ttype token_type, | |
8217 tree value, unsigned char token_flags) | |
8218 { | |
8219 #define catenate_messages(M1, M2) catenate_strings ((M1), (M2), sizeof (M2)) | |
8220 | |
8221 char *message = NULL; | |
8222 | |
8223 if (token_type == CPP_EOF) | |
8224 message = catenate_messages (gmsgid, " at end of input"); | |
8225 else if (token_type == CPP_CHAR | |
8226 || token_type == CPP_WCHAR | |
8227 || token_type == CPP_CHAR16 | |
8228 || token_type == CPP_CHAR32) | |
8229 { | |
8230 unsigned int val = TREE_INT_CST_LOW (value); | |
8231 const char *prefix; | |
8232 | |
8233 switch (token_type) | |
8234 { | |
8235 default: | |
8236 prefix = ""; | |
8237 break; | |
8238 case CPP_WCHAR: | |
8239 prefix = "L"; | |
8240 break; | |
8241 case CPP_CHAR16: | |
8242 prefix = "u"; | |
8243 break; | |
8244 case CPP_CHAR32: | |
8245 prefix = "U"; | |
8246 break; | |
8247 } | |
8248 | |
8249 if (val <= UCHAR_MAX && ISGRAPH (val)) | |
8250 message = catenate_messages (gmsgid, " before %s'%c'"); | |
8251 else | |
8252 message = catenate_messages (gmsgid, " before %s'\\x%x'"); | |
8253 | |
8254 error (message, prefix, val); | |
8255 free (message); | |
8256 message = NULL; | |
8257 } | |
8258 else if (token_type == CPP_STRING | |
8259 || token_type == CPP_WSTRING | |
8260 || token_type == CPP_STRING16 | |
8261 || token_type == CPP_STRING32 | |
8262 || token_type == CPP_UTF8STRING) | |
8263 message = catenate_messages (gmsgid, " before string constant"); | |
8264 else if (token_type == CPP_NUMBER) | |
8265 message = catenate_messages (gmsgid, " before numeric constant"); | |
8266 else if (token_type == CPP_NAME) | |
8267 { | |
8268 message = catenate_messages (gmsgid, " before %qE"); | |
8269 error (message, value); | |
8270 free (message); | |
8271 message = NULL; | |
8272 } | |
8273 else if (token_type == CPP_PRAGMA) | |
8274 message = catenate_messages (gmsgid, " before %<#pragma%>"); | |
8275 else if (token_type == CPP_PRAGMA_EOL) | |
8276 message = catenate_messages (gmsgid, " before end of line"); | |
8277 else if (token_type < N_TTYPES) | |
8278 { | |
8279 message = catenate_messages (gmsgid, " before %qs token"); | |
8280 error (message, cpp_type2name (token_type, token_flags)); | |
8281 free (message); | |
8282 message = NULL; | |
8283 } | |
8284 else | |
8285 error (gmsgid); | |
8286 | |
8287 if (message) | |
8288 { | |
8289 error (message); | |
8290 free (message); | |
8291 } | |
8292 #undef catenate_messages | |
8293 } | |
8294 | |
8295 /* Mapping for cpp message reasons to the options that enable them. */ | |
8296 | |
8297 struct reason_option_codes_t | |
8298 { | |
8299 const int reason; /* cpplib message reason. */ | |
8300 const int option_code; /* gcc option that controls this message. */ | |
8301 }; | |
8302 | |
8303 static const struct reason_option_codes_t option_codes[] = { | |
8304 {CPP_W_DEPRECATED, OPT_Wdeprecated}, | |
8305 {CPP_W_COMMENTS, OPT_Wcomment}, | |
8306 {CPP_W_TRIGRAPHS, OPT_Wtrigraphs}, | |
8307 {CPP_W_MULTICHAR, OPT_Wmultichar}, | |
8308 {CPP_W_TRADITIONAL, OPT_Wtraditional}, | |
8309 {CPP_W_LONG_LONG, OPT_Wlong_long}, | |
8310 {CPP_W_ENDIF_LABELS, OPT_Wendif_labels}, | |
8311 {CPP_W_VARIADIC_MACROS, OPT_Wvariadic_macros}, | |
8312 {CPP_W_BUILTIN_MACRO_REDEFINED, OPT_Wbuiltin_macro_redefined}, | |
8313 {CPP_W_UNDEF, OPT_Wundef}, | |
8314 {CPP_W_UNUSED_MACROS, OPT_Wunused_macros}, | |
8315 {CPP_W_CXX_OPERATOR_NAMES, OPT_Wc___compat}, | |
8316 {CPP_W_NORMALIZE, OPT_Wnormalized_}, | |
8317 {CPP_W_INVALID_PCH, OPT_Winvalid_pch}, | |
8318 {CPP_W_WARNING_DIRECTIVE, OPT_Wcpp}, | |
8319 {CPP_W_NONE, 0} | |
8320 }; | |
8321 | |
8322 /* Return the gcc option code associated with the reason for a cpp | |
8323 message, or 0 if none. */ | |
8324 | |
8325 static int | |
8326 c_option_controlling_cpp_error (int reason) | |
8327 { | |
8328 const struct reason_option_codes_t *entry; | |
8329 | |
8330 for (entry = option_codes; entry->reason != CPP_W_NONE; entry++) | |
8331 { | |
8332 if (entry->reason == reason) | |
8333 return entry->option_code; | |
8334 } | |
8335 return 0; | |
8336 } | |
8337 | |
8338 /* Callback from cpp_error for PFILE to print diagnostics from the | |
8339 preprocessor. The diagnostic is of type LEVEL, with REASON set | |
8340 to the reason code if LEVEL is represents a warning, at location | |
8341 LOCATION unless this is after lexing and the compiler's location | |
8342 should be used instead, with column number possibly overridden by | |
8343 COLUMN_OVERRIDE if not zero; MSG is the translated message and AP | |
8344 the arguments. Returns true if a diagnostic was emitted, false | |
8345 otherwise. */ | |
8346 | |
8347 bool | |
8348 c_cpp_error (cpp_reader *pfile ATTRIBUTE_UNUSED, int level, int reason, | |
8349 location_t location, unsigned int column_override, | |
8350 const char *msg, va_list *ap) | |
8351 { | |
8352 diagnostic_info diagnostic; | |
8353 diagnostic_t dlevel; | |
8354 bool save_warn_system_headers = global_dc->dc_warn_system_headers; | |
8355 bool ret; | |
8356 | |
8357 switch (level) | |
8358 { | |
8359 case CPP_DL_WARNING_SYSHDR: | |
8360 if (flag_no_output) | |
8361 return false; | |
8362 global_dc->dc_warn_system_headers = 1; | |
8363 /* Fall through. */ | |
8364 case CPP_DL_WARNING: | |
8365 if (flag_no_output) | |
8366 return false; | |
8367 dlevel = DK_WARNING; | |
8368 break; | |
8369 case CPP_DL_PEDWARN: | |
8370 if (flag_no_output && !flag_pedantic_errors) | |
8371 return false; | |
8372 dlevel = DK_PEDWARN; | |
8373 break; | |
8374 case CPP_DL_ERROR: | |
8375 dlevel = DK_ERROR; | |
8376 break; | |
8377 case CPP_DL_ICE: | |
8378 dlevel = DK_ICE; | |
8379 break; | |
8380 case CPP_DL_NOTE: | |
8381 dlevel = DK_NOTE; | |
8382 break; | |
8383 case CPP_DL_FATAL: | |
8384 dlevel = DK_FATAL; | |
8385 break; | |
8386 default: | |
8387 gcc_unreachable (); | |
8388 } | |
8389 if (done_lexing) | |
8390 location = input_location; | |
8391 diagnostic_set_info_translated (&diagnostic, msg, ap, | |
8392 location, dlevel); | |
8393 if (column_override) | |
8394 diagnostic_override_column (&diagnostic, column_override); | |
8395 diagnostic_override_option_index (&diagnostic, | |
8396 c_option_controlling_cpp_error (reason)); | |
8397 ret = report_diagnostic (&diagnostic); | |
8398 if (level == CPP_DL_WARNING_SYSHDR) | |
8399 global_dc->dc_warn_system_headers = save_warn_system_headers; | |
8400 return ret; | |
8401 } | |
8402 | |
8403 /* Convert a character from the host to the target execution character | |
8404 set. cpplib handles this, mostly. */ | |
8405 | |
8406 HOST_WIDE_INT | |
8407 c_common_to_target_charset (HOST_WIDE_INT c) | |
8408 { | |
8409 /* Character constants in GCC proper are sign-extended under -fsigned-char, | |
8410 zero-extended under -fno-signed-char. cpplib insists that characters | |
8411 and character constants are always unsigned. Hence we must convert | |
8412 back and forth. */ | |
8413 cppchar_t uc = ((cppchar_t)c) & ((((cppchar_t)1) << CHAR_BIT)-1); | |
8414 | |
8415 uc = cpp_host_to_exec_charset (parse_in, uc); | |
8416 | |
8417 if (flag_signed_char) | |
8418 return ((HOST_WIDE_INT)uc) << (HOST_BITS_PER_WIDE_INT - CHAR_TYPE_SIZE) | |
8419 >> (HOST_BITS_PER_WIDE_INT - CHAR_TYPE_SIZE); | |
8420 else | |
8421 return uc; | |
8422 } | |
8423 | |
8424 /* Build the result of __builtin_offsetof. EXPR is a nested sequence of | |
8425 component references, with STOP_REF, or alternatively an INDIRECT_REF of | |
8426 NULL, at the bottom; much like the traditional rendering of offsetof as a | |
8427 macro. Returns the folded and properly cast result. */ | |
8428 | |
8429 static tree | |
8430 fold_offsetof_1 (tree expr, tree stop_ref) | |
8431 { | |
8432 enum tree_code code = PLUS_EXPR; | |
8433 tree base, off, t; | |
8434 | |
8435 if (expr == stop_ref && TREE_CODE (expr) != ERROR_MARK) | |
8436 return size_zero_node; | |
8437 | |
8438 switch (TREE_CODE (expr)) | |
8439 { | |
8440 case ERROR_MARK: | |
8441 return expr; | |
8442 | |
8443 case VAR_DECL: | |
8444 error ("cannot apply %<offsetof%> to static data member %qD", expr); | |
8445 return error_mark_node; | |
8446 | |
8447 case CALL_EXPR: | |
8448 case TARGET_EXPR: | |
8449 error ("cannot apply %<offsetof%> when %<operator[]%> is overloaded"); | |
8450 return error_mark_node; | |
8451 | |
8452 case NOP_EXPR: | |
8453 case INDIRECT_REF: | |
8454 if (!integer_zerop (TREE_OPERAND (expr, 0))) | |
8455 { | |
8456 error ("cannot apply %<offsetof%> to a non constant address"); | |
8457 return error_mark_node; | |
8458 } | |
8459 return size_zero_node; | |
8460 | |
8461 case COMPONENT_REF: | |
8462 base = fold_offsetof_1 (TREE_OPERAND (expr, 0), stop_ref); | |
8463 if (base == error_mark_node) | |
8464 return base; | |
8465 | |
8466 t = TREE_OPERAND (expr, 1); | |
8467 if (DECL_C_BIT_FIELD (t)) | |
8468 { | |
8469 error ("attempt to take address of bit-field structure " | |
8470 "member %qD", t); | |
8471 return error_mark_node; | |
8472 } | |
8473 off = size_binop_loc (input_location, PLUS_EXPR, DECL_FIELD_OFFSET (t), | |
8474 size_int (tree_low_cst (DECL_FIELD_BIT_OFFSET (t), | |
8475 1) | |
8476 / BITS_PER_UNIT)); | |
8477 break; | |
8478 | |
8479 case ARRAY_REF: | |
8480 base = fold_offsetof_1 (TREE_OPERAND (expr, 0), stop_ref); | |
8481 if (base == error_mark_node) | |
8482 return base; | |
8483 | |
8484 t = TREE_OPERAND (expr, 1); | |
8485 if (TREE_CODE (t) == INTEGER_CST && tree_int_cst_sgn (t) < 0) | |
8486 { | |
8487 code = MINUS_EXPR; | |
8488 t = fold_build1_loc (input_location, NEGATE_EXPR, TREE_TYPE (t), t); | |
8489 } | |
8490 t = convert (sizetype, t); | |
8491 off = size_binop (MULT_EXPR, TYPE_SIZE_UNIT (TREE_TYPE (expr)), t); | |
8492 | |
8493 /* Check if the offset goes beyond the upper bound of the array. */ | |
8494 if (code == PLUS_EXPR && TREE_CODE (t) == INTEGER_CST) | |
8495 { | |
8496 tree upbound = array_ref_up_bound (expr); | |
8497 if (upbound != NULL_TREE | |
8498 && TREE_CODE (upbound) == INTEGER_CST | |
8499 && !tree_int_cst_equal (upbound, | |
8500 TYPE_MAX_VALUE (TREE_TYPE (upbound)))) | |
8501 { | |
8502 upbound = size_binop (PLUS_EXPR, upbound, | |
8503 build_int_cst (TREE_TYPE (upbound), 1)); | |
8504 if (tree_int_cst_lt (upbound, t)) | |
8505 { | |
8506 tree v; | |
8507 | |
8508 for (v = TREE_OPERAND (expr, 0); | |
8509 TREE_CODE (v) == COMPONENT_REF; | |
8510 v = TREE_OPERAND (v, 0)) | |
8511 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (v, 0))) | |
8512 == RECORD_TYPE) | |
8513 { | |
8514 tree fld_chain = DECL_CHAIN (TREE_OPERAND (v, 1)); | |
8515 for (; fld_chain; fld_chain = DECL_CHAIN (fld_chain)) | |
8516 if (TREE_CODE (fld_chain) == FIELD_DECL) | |
8517 break; | |
8518 | |
8519 if (fld_chain) | |
8520 break; | |
8521 } | |
8522 /* Don't warn if the array might be considered a poor | |
8523 man's flexible array member with a very permissive | |
8524 definition thereof. */ | |
8525 if (TREE_CODE (v) == ARRAY_REF | |
8526 || TREE_CODE (v) == COMPONENT_REF) | |
8527 warning (OPT_Warray_bounds, | |
8528 "index %E denotes an offset " | |
8529 "greater than size of %qT", | |
8530 t, TREE_TYPE (TREE_OPERAND (expr, 0))); | |
8531 } | |
8532 } | |
8533 } | |
8534 break; | |
8535 | |
8536 case COMPOUND_EXPR: | |
8537 /* Handle static members of volatile structs. */ | |
8538 t = TREE_OPERAND (expr, 1); | |
8539 gcc_assert (TREE_CODE (t) == VAR_DECL); | |
8540 return fold_offsetof_1 (t, stop_ref); | |
8541 | |
8542 default: | |
8543 gcc_unreachable (); | |
8544 } | |
8545 | |
8546 return size_binop (code, base, off); | |
8547 } | |
8548 | |
8549 tree | |
8550 fold_offsetof (tree expr, tree stop_ref) | |
8551 { | |
8552 /* Convert back from the internal sizetype to size_t. */ | |
8553 return convert (size_type_node, fold_offsetof_1 (expr, stop_ref)); | |
8554 } | |
8555 | |
8556 /* Warn for A ?: C expressions (with B omitted) where A is a boolean | |
8557 expression, because B will always be true. */ | |
8558 | |
8559 void | |
8560 warn_for_omitted_condop (location_t location, tree cond) | |
8561 { | |
8562 if (truth_value_p (TREE_CODE (cond))) | |
8563 warning_at (location, OPT_Wparentheses, | |
8564 "the omitted middle operand in ?: will always be %<true%>, " | |
8565 "suggest explicit middle operand"); | |
8566 } | |
8567 | |
8568 /* Give an error for storing into ARG, which is 'const'. USE indicates | |
8569 how ARG was being used. */ | |
8570 | |
8571 void | |
8572 readonly_error (tree arg, enum lvalue_use use) | |
8573 { | |
8574 gcc_assert (use == lv_assign || use == lv_increment || use == lv_decrement | |
8575 || use == lv_asm); | |
8576 /* Using this macro rather than (for example) arrays of messages | |
8577 ensures that all the format strings are checked at compile | |
8578 time. */ | |
8579 #define READONLY_MSG(A, I, D, AS) (use == lv_assign ? (A) \ | |
8580 : (use == lv_increment ? (I) \ | |
8581 : (use == lv_decrement ? (D) : (AS)))) | |
8582 if (TREE_CODE (arg) == COMPONENT_REF) | |
8583 { | |
8584 if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0)))) | |
8585 error (READONLY_MSG (G_("assignment of member " | |
8586 "%qD in read-only object"), | |
8587 G_("increment of member " | |
8588 "%qD in read-only object"), | |
8589 G_("decrement of member " | |
8590 "%qD in read-only object"), | |
8591 G_("member %qD in read-only object " | |
8592 "used as %<asm%> output")), | |
8593 TREE_OPERAND (arg, 1)); | |
8594 else | |
8595 error (READONLY_MSG (G_("assignment of read-only member %qD"), | |
8596 G_("increment of read-only member %qD"), | |
8597 G_("decrement of read-only member %qD"), | |
8598 G_("read-only member %qD used as %<asm%> output")), | |
8599 TREE_OPERAND (arg, 1)); | |
8600 } | |
8601 else if (TREE_CODE (arg) == VAR_DECL) | |
8602 error (READONLY_MSG (G_("assignment of read-only variable %qD"), | |
8603 G_("increment of read-only variable %qD"), | |
8604 G_("decrement of read-only variable %qD"), | |
8605 G_("read-only variable %qD used as %<asm%> output")), | |
8606 arg); | |
8607 else if (TREE_CODE (arg) == PARM_DECL) | |
8608 error (READONLY_MSG (G_("assignment of read-only parameter %qD"), | |
8609 G_("increment of read-only parameter %qD"), | |
8610 G_("decrement of read-only parameter %qD"), | |
8611 G_("read-only parameter %qD use as %<asm%> output")), | |
8612 arg); | |
8613 else if (TREE_CODE (arg) == RESULT_DECL) | |
8614 { | |
8615 gcc_assert (c_dialect_cxx ()); | |
8616 error (READONLY_MSG (G_("assignment of " | |
8617 "read-only named return value %qD"), | |
8618 G_("increment of " | |
8619 "read-only named return value %qD"), | |
8620 G_("decrement of " | |
8621 "read-only named return value %qD"), | |
8622 G_("read-only named return value %qD " | |
8623 "used as %<asm%>output")), | |
8624 arg); | |
8625 } | |
8626 else if (TREE_CODE (arg) == FUNCTION_DECL) | |
8627 error (READONLY_MSG (G_("assignment of function %qD"), | |
8628 G_("increment of function %qD"), | |
8629 G_("decrement of function %qD"), | |
8630 G_("function %qD used as %<asm%> output")), | |
8631 arg); | |
8632 else | |
8633 error (READONLY_MSG (G_("assignment of read-only location %qE"), | |
8634 G_("increment of read-only location %qE"), | |
8635 G_("decrement of read-only location %qE"), | |
8636 G_("read-only location %qE used as %<asm%> output")), | |
8637 arg); | |
8638 } | |
8639 | |
8640 /* Print an error message for an invalid lvalue. USE says | |
8641 how the lvalue is being used and so selects the error message. LOC | |
8642 is the location for the error. */ | |
8643 | |
8644 void | |
8645 lvalue_error (location_t loc, enum lvalue_use use) | |
8646 { | |
8647 switch (use) | |
8648 { | |
8649 case lv_assign: | |
8650 error_at (loc, "lvalue required as left operand of assignment"); | |
8651 break; | |
8652 case lv_increment: | |
8653 error_at (loc, "lvalue required as increment operand"); | |
8654 break; | |
8655 case lv_decrement: | |
8656 error_at (loc, "lvalue required as decrement operand"); | |
8657 break; | |
8658 case lv_addressof: | |
8659 error_at (loc, "lvalue required as unary %<&%> operand"); | |
8660 break; | |
8661 case lv_asm: | |
8662 error_at (loc, "lvalue required in asm statement"); | |
8663 break; | |
8664 default: | |
8665 gcc_unreachable (); | |
8666 } | |
8667 } | |
8668 | |
8669 /* Print an error message for an invalid indirection of type TYPE. | |
8670 ERRSTRING is the name of the operator for the indirection. */ | |
8671 | |
8672 void | |
8673 invalid_indirection_error (location_t loc, tree type, ref_operator errstring) | |
8674 { | |
8675 switch (errstring) | |
8676 { | |
8677 case RO_NULL: | |
8678 gcc_assert (c_dialect_cxx ()); | |
8679 error_at (loc, "invalid type argument (have %qT)", type); | |
8680 break; | |
8681 case RO_ARRAY_INDEXING: | |
8682 error_at (loc, | |
8683 "invalid type argument of array indexing (have %qT)", | |
8684 type); | |
8685 break; | |
8686 case RO_UNARY_STAR: | |
8687 error_at (loc, | |
8688 "invalid type argument of unary %<*%> (have %qT)", | |
8689 type); | |
8690 break; | |
8691 case RO_ARROW: | |
8692 error_at (loc, | |
8693 "invalid type argument of %<->%> (have %qT)", | |
8694 type); | |
8695 break; | |
8696 case RO_IMPLICIT_CONVERSION: | |
8697 error_at (loc, | |
8698 "invalid type argument of implicit conversion (have %qT)", | |
8699 type); | |
8700 break; | |
8701 default: | |
8702 gcc_unreachable (); | |
8703 } | |
8704 } | |
8705 | |
8706 /* *PTYPE is an incomplete array. Complete it with a domain based on | |
8707 INITIAL_VALUE. If INITIAL_VALUE is not present, use 1 if DO_DEFAULT | |
8708 is true. Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered, | |
8709 2 if INITIAL_VALUE was NULL, and 3 if INITIAL_VALUE was empty. */ | |
8710 | |
8711 int | |
8712 complete_array_type (tree *ptype, tree initial_value, bool do_default) | |
8713 { | |
8714 tree maxindex, type, main_type, elt, unqual_elt; | |
8715 int failure = 0, quals; | |
8716 hashval_t hashcode = 0; | |
8717 | |
8718 maxindex = size_zero_node; | |
8719 if (initial_value) | |
8720 { | |
8721 if (TREE_CODE (initial_value) == STRING_CST) | |
8722 { | |
8723 int eltsize | |
8724 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value))); | |
8725 maxindex = size_int (TREE_STRING_LENGTH (initial_value)/eltsize - 1); | |
8726 } | |
8727 else if (TREE_CODE (initial_value) == CONSTRUCTOR) | |
8728 { | |
8729 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value); | |
8730 | |
8731 if (VEC_empty (constructor_elt, v)) | |
8732 { | |
8733 if (pedantic) | |
8734 failure = 3; | |
8735 maxindex = integer_minus_one_node; | |
8736 } | |
8737 else | |
8738 { | |
8739 tree curindex; | |
8740 unsigned HOST_WIDE_INT cnt; | |
8741 constructor_elt *ce; | |
8742 bool fold_p = false; | |
8743 | |
8744 if (VEC_index (constructor_elt, v, 0)->index) | |
8745 maxindex = fold_convert_loc (input_location, sizetype, | |
8746 VEC_index (constructor_elt, | |
8747 v, 0)->index); | |
8748 curindex = maxindex; | |
8749 | |
8750 for (cnt = 1; | |
8751 VEC_iterate (constructor_elt, v, cnt, ce); | |
8752 cnt++) | |
8753 { | |
8754 bool curfold_p = false; | |
8755 if (ce->index) | |
8756 curindex = ce->index, curfold_p = true; | |
8757 else | |
8758 { | |
8759 if (fold_p) | |
8760 curindex = fold_convert (sizetype, curindex); | |
8761 curindex = size_binop (PLUS_EXPR, curindex, | |
8762 size_one_node); | |
8763 } | |
8764 if (tree_int_cst_lt (maxindex, curindex)) | |
8765 maxindex = curindex, fold_p = curfold_p; | |
8766 } | |
8767 if (fold_p) | |
8768 maxindex = fold_convert (sizetype, maxindex); | |
8769 } | |
8770 } | |
8771 else | |
8772 { | |
8773 /* Make an error message unless that happened already. */ | |
8774 if (initial_value != error_mark_node) | |
8775 failure = 1; | |
8776 } | |
8777 } | |
8778 else | |
8779 { | |
8780 failure = 2; | |
8781 if (!do_default) | |
8782 return failure; | |
8783 } | |
8784 | |
8785 type = *ptype; | |
8786 elt = TREE_TYPE (type); | |
8787 quals = TYPE_QUALS (strip_array_types (elt)); | |
8788 if (quals == 0) | |
8789 unqual_elt = elt; | |
8790 else | |
8791 unqual_elt = c_build_qualified_type (elt, KEEP_QUAL_ADDR_SPACE (quals)); | |
8792 | |
8793 /* Using build_distinct_type_copy and modifying things afterward instead | |
8794 of using build_array_type to create a new type preserves all of the | |
8795 TYPE_LANG_FLAG_? bits that the front end may have set. */ | |
8796 main_type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); | |
8797 TREE_TYPE (main_type) = unqual_elt; | |
8798 TYPE_DOMAIN (main_type) = build_index_type (maxindex); | |
8799 layout_type (main_type); | |
8800 | |
8801 /* Make sure we have the canonical MAIN_TYPE. */ | |
8802 hashcode = iterative_hash_object (TYPE_HASH (unqual_elt), hashcode); | |
8803 hashcode = iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (main_type)), | |
8804 hashcode); | |
8805 main_type = type_hash_canon (hashcode, main_type); | |
8806 | |
8807 /* Fix the canonical type. */ | |
8808 if (TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (main_type)) | |
8809 || TYPE_STRUCTURAL_EQUALITY_P (TYPE_DOMAIN (main_type))) | |
8810 SET_TYPE_STRUCTURAL_EQUALITY (main_type); | |
8811 else if (TYPE_CANONICAL (TREE_TYPE (main_type)) != TREE_TYPE (main_type) | |
8812 || (TYPE_CANONICAL (TYPE_DOMAIN (main_type)) | |
8813 != TYPE_DOMAIN (main_type))) | |
8814 TYPE_CANONICAL (main_type) | |
8815 = build_array_type (TYPE_CANONICAL (TREE_TYPE (main_type)), | |
8816 TYPE_CANONICAL (TYPE_DOMAIN (main_type))); | |
8817 else | |
8818 TYPE_CANONICAL (main_type) = main_type; | |
8819 | |
8820 if (quals == 0) | |
8821 type = main_type; | |
8822 else | |
8823 type = c_build_qualified_type (main_type, quals); | |
8824 | |
8825 if (COMPLETE_TYPE_P (type) | |
8826 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST | |
8827 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type))) | |
8828 { | |
8829 error ("size of array is too large"); | |
8830 /* If we proceed with the array type as it is, we'll eventually | |
8831 crash in tree_low_cst(). */ | |
8832 type = error_mark_node; | |
8833 } | |
8834 | |
8835 *ptype = type; | |
8836 return failure; | |
8837 } | |
8838 | |
8839 /* Like c_mark_addressable but don't check register qualifier. */ | |
8840 void | |
8841 c_common_mark_addressable_vec (tree t) | |
8842 { | |
8843 while (handled_component_p (t)) | |
8844 t = TREE_OPERAND (t, 0); | |
8845 if (TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != PARM_DECL) | |
8846 return; | |
8847 TREE_ADDRESSABLE (t) = 1; | |
8848 } | |
8849 | |
8850 | |
8851 | |
8852 /* Used to help initialize the builtin-types.def table. When a type of | |
8853 the correct size doesn't exist, use error_mark_node instead of NULL. | |
8854 The later results in segfaults even when a decl using the type doesn't | |
8855 get invoked. */ | |
8856 | |
8857 tree | |
8858 builtin_type_for_size (int size, bool unsignedp) | |
8859 { | |
8860 tree type = lang_hooks.types.type_for_size (size, unsignedp); | |
8861 return type ? type : error_mark_node; | |
8862 } | |
8863 | |
8864 /* A helper function for resolve_overloaded_builtin in resolving the | |
8865 overloaded __sync_ builtins. Returns a positive power of 2 if the | |
8866 first operand of PARAMS is a pointer to a supported data type. | |
8867 Returns 0 if an error is encountered. */ | |
8868 | |
8869 static int | |
8870 sync_resolve_size (tree function, VEC(tree,gc) *params) | |
8871 { | |
8872 tree type; | |
8873 int size; | |
8874 | |
8875 if (VEC_empty (tree, params)) | |
8876 { | |
8877 error ("too few arguments to function %qE", function); | |
8878 return 0; | |
8879 } | |
8880 | |
8881 type = TREE_TYPE (VEC_index (tree, params, 0)); | |
8882 if (TREE_CODE (type) != POINTER_TYPE) | |
8883 goto incompatible; | |
8884 | |
8885 type = TREE_TYPE (type); | |
8886 if (!INTEGRAL_TYPE_P (type) && !POINTER_TYPE_P (type)) | |
8887 goto incompatible; | |
8888 | |
8889 size = tree_low_cst (TYPE_SIZE_UNIT (type), 1); | |
8890 if (size == 1 || size == 2 || size == 4 || size == 8 || size == 16) | |
8891 return size; | |
8892 | |
8893 incompatible: | |
8894 error ("incompatible type for argument %d of %qE", 1, function); | |
8895 return 0; | |
8896 } | |
8897 | |
8898 /* A helper function for resolve_overloaded_builtin. Adds casts to | |
8899 PARAMS to make arguments match up with those of FUNCTION. Drops | |
8900 the variadic arguments at the end. Returns false if some error | |
8901 was encountered; true on success. */ | |
8902 | |
8903 static bool | |
8904 sync_resolve_params (tree orig_function, tree function, VEC(tree, gc) *params) | |
8905 { | |
8906 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (function)); | |
8907 tree ptype; | |
8908 unsigned int parmnum; | |
8909 | |
8910 /* We've declared the implementation functions to use "volatile void *" | |
8911 as the pointer parameter, so we shouldn't get any complaints from the | |
8912 call to check_function_arguments what ever type the user used. */ | |
8913 arg_types = TREE_CHAIN (arg_types); | |
8914 ptype = TREE_TYPE (TREE_TYPE (VEC_index (tree, params, 0))); | |
8915 | |
8916 /* For the rest of the values, we need to cast these to FTYPE, so that we | |
8917 don't get warnings for passing pointer types, etc. */ | |
8918 parmnum = 0; | |
8919 while (arg_types != void_list_node) | |
8920 { | |
8921 tree val; | |
8922 | |
8923 ++parmnum; | |
8924 if (VEC_length (tree, params) <= parmnum) | |
8925 { | |
8926 error ("too few arguments to function %qE", orig_function); | |
8927 return false; | |
8928 } | |
8929 | |
8930 /* ??? Ideally for the first conversion we'd use convert_for_assignment | |
8931 so that we get warnings for anything that doesn't match the pointer | |
8932 type. This isn't portable across the C and C++ front ends atm. */ | |
8933 val = VEC_index (tree, params, parmnum); | |
8934 val = convert (ptype, val); | |
8935 val = convert (TREE_VALUE (arg_types), val); | |
8936 VEC_replace (tree, params, parmnum, val); | |
8937 | |
8938 arg_types = TREE_CHAIN (arg_types); | |
8939 } | |
8940 | |
8941 /* The definition of these primitives is variadic, with the remaining | |
8942 being "an optional list of variables protected by the memory barrier". | |
8943 No clue what that's supposed to mean, precisely, but we consider all | |
8944 call-clobbered variables to be protected so we're safe. */ | |
8945 VEC_truncate (tree, params, parmnum + 1); | |
8946 | |
8947 return true; | |
8948 } | |
8949 | |
8950 /* A helper function for resolve_overloaded_builtin. Adds a cast to | |
8951 RESULT to make it match the type of the first pointer argument in | |
8952 PARAMS. */ | |
8953 | |
8954 static tree | |
8955 sync_resolve_return (tree first_param, tree result) | |
8956 { | |
8957 tree ptype = TREE_TYPE (TREE_TYPE (first_param)); | |
8958 ptype = TYPE_MAIN_VARIANT (ptype); | |
8959 return convert (ptype, result); | |
8960 } | |
8961 | |
8962 /* Some builtin functions are placeholders for other expressions. This | |
8963 function should be called immediately after parsing the call expression | |
8964 before surrounding code has committed to the type of the expression. | |
8965 | |
8966 LOC is the location of the builtin call. | |
8967 | |
8968 FUNCTION is the DECL that has been invoked; it is known to be a builtin. | |
8969 PARAMS is the argument list for the call. The return value is non-null | |
8970 when expansion is complete, and null if normal processing should | |
8971 continue. */ | |
8972 | |
8973 tree | |
8974 resolve_overloaded_builtin (location_t loc, tree function, VEC(tree,gc) *params) | |
8975 { | |
8976 enum built_in_function orig_code = DECL_FUNCTION_CODE (function); | |
8977 switch (DECL_BUILT_IN_CLASS (function)) | |
8978 { | |
8979 case BUILT_IN_NORMAL: | |
8980 break; | |
8981 case BUILT_IN_MD: | |
8982 if (targetm.resolve_overloaded_builtin) | |
8983 return targetm.resolve_overloaded_builtin (loc, function, params); | |
8984 else | |
8985 return NULL_TREE; | |
8986 default: | |
8987 return NULL_TREE; | |
8988 } | |
8989 | |
8990 /* Handle BUILT_IN_NORMAL here. */ | |
8991 switch (orig_code) | |
8992 { | |
8993 case BUILT_IN_FETCH_AND_ADD_N: | |
8994 case BUILT_IN_FETCH_AND_SUB_N: | |
8995 case BUILT_IN_FETCH_AND_OR_N: | |
8996 case BUILT_IN_FETCH_AND_AND_N: | |
8997 case BUILT_IN_FETCH_AND_XOR_N: | |
8998 case BUILT_IN_FETCH_AND_NAND_N: | |
8999 case BUILT_IN_ADD_AND_FETCH_N: | |
9000 case BUILT_IN_SUB_AND_FETCH_N: | |
9001 case BUILT_IN_OR_AND_FETCH_N: | |
9002 case BUILT_IN_AND_AND_FETCH_N: | |
9003 case BUILT_IN_XOR_AND_FETCH_N: | |
9004 case BUILT_IN_NAND_AND_FETCH_N: | |
9005 case BUILT_IN_BOOL_COMPARE_AND_SWAP_N: | |
9006 case BUILT_IN_VAL_COMPARE_AND_SWAP_N: | |
9007 case BUILT_IN_LOCK_TEST_AND_SET_N: | |
9008 case BUILT_IN_LOCK_RELEASE_N: | |
9009 { | |
9010 int n = sync_resolve_size (function, params); | |
9011 tree new_function, first_param, result; | |
9012 | |
9013 if (n == 0) | |
9014 return error_mark_node; | |
9015 | |
9016 new_function = built_in_decls[orig_code + exact_log2 (n) + 1]; | |
9017 if (!sync_resolve_params (function, new_function, params)) | |
9018 return error_mark_node; | |
9019 | |
9020 first_param = VEC_index (tree, params, 0); | |
9021 result = build_function_call_vec (loc, new_function, params, NULL); | |
9022 if (orig_code != BUILT_IN_BOOL_COMPARE_AND_SWAP_N | |
9023 && orig_code != BUILT_IN_LOCK_RELEASE_N) | |
9024 result = sync_resolve_return (first_param, result); | |
9025 | |
9026 return result; | |
9027 } | |
9028 | |
9029 default: | |
9030 return NULL_TREE; | |
9031 } | |
9032 } | |
9033 | |
9034 /* Ignoring their sign, return true if two scalar types are the same. */ | |
9035 bool | |
9036 same_scalar_type_ignoring_signedness (tree t1, tree t2) | |
9037 { | |
9038 enum tree_code c1 = TREE_CODE (t1), c2 = TREE_CODE (t2); | |
9039 | |
9040 gcc_assert ((c1 == INTEGER_TYPE || c1 == REAL_TYPE || c1 == FIXED_POINT_TYPE) | |
9041 && (c2 == INTEGER_TYPE || c2 == REAL_TYPE | |
9042 || c2 == FIXED_POINT_TYPE)); | |
9043 | |
9044 /* Equality works here because c_common_signed_type uses | |
9045 TYPE_MAIN_VARIANT. */ | |
9046 return c_common_signed_type (t1) | |
9047 == c_common_signed_type (t2); | |
9048 } | |
9049 | |
9050 /* Check for missing format attributes on function pointers. LTYPE is | |
9051 the new type or left-hand side type. RTYPE is the old type or | |
9052 right-hand side type. Returns TRUE if LTYPE is missing the desired | |
9053 attribute. */ | |
9054 | |
9055 bool | |
9056 check_missing_format_attribute (tree ltype, tree rtype) | |
9057 { | |
9058 tree const ttr = TREE_TYPE (rtype), ttl = TREE_TYPE (ltype); | |
9059 tree ra; | |
9060 | |
9061 for (ra = TYPE_ATTRIBUTES (ttr); ra; ra = TREE_CHAIN (ra)) | |
9062 if (is_attribute_p ("format", TREE_PURPOSE (ra))) | |
9063 break; | |
9064 if (ra) | |
9065 { | |
9066 tree la; | |
9067 for (la = TYPE_ATTRIBUTES (ttl); la; la = TREE_CHAIN (la)) | |
9068 if (is_attribute_p ("format", TREE_PURPOSE (la))) | |
9069 break; | |
9070 return !la; | |
9071 } | |
9072 else | |
9073 return false; | |
9074 } | |
9075 | |
9076 /* Subscripting with type char is likely to lose on a machine where | |
9077 chars are signed. So warn on any machine, but optionally. Don't | |
9078 warn for unsigned char since that type is safe. Don't warn for | |
9079 signed char because anyone who uses that must have done so | |
9080 deliberately. Furthermore, we reduce the false positive load by | |
9081 warning only for non-constant value of type char. */ | |
9082 | |
9083 void | |
9084 warn_array_subscript_with_type_char (tree index) | |
9085 { | |
9086 if (TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node | |
9087 && TREE_CODE (index) != INTEGER_CST) | |
9088 warning (OPT_Wchar_subscripts, "array subscript has type %<char%>"); | |
9089 } | |
9090 | |
9091 /* Implement -Wparentheses for the unexpected C precedence rules, to | |
9092 cover cases like x + y << z which readers are likely to | |
9093 misinterpret. We have seen an expression in which CODE is a binary | |
9094 operator used to combine expressions ARG_LEFT and ARG_RIGHT, which | |
9095 before folding had CODE_LEFT and CODE_RIGHT. CODE_LEFT and | |
9096 CODE_RIGHT may be ERROR_MARK, which means that that side of the | |
9097 expression was not formed using a binary or unary operator, or it | |
9098 was enclosed in parentheses. */ | |
9099 | |
9100 void | |
9101 warn_about_parentheses (enum tree_code code, | |
9102 enum tree_code code_left, tree arg_left, | |
9103 enum tree_code code_right, tree arg_right) | |
9104 { | |
9105 if (!warn_parentheses) | |
9106 return; | |
9107 | |
9108 /* This macro tests that the expression ARG with original tree code | |
9109 CODE appears to be a boolean expression. or the result of folding a | |
9110 boolean expression. */ | |
9111 #define APPEARS_TO_BE_BOOLEAN_EXPR_P(CODE, ARG) \ | |
9112 (truth_value_p (TREE_CODE (ARG)) \ | |
9113 || TREE_CODE (TREE_TYPE (ARG)) == BOOLEAN_TYPE \ | |
9114 /* Folding may create 0 or 1 integers from other expressions. */ \ | |
9115 || ((CODE) != INTEGER_CST \ | |
9116 && (integer_onep (ARG) || integer_zerop (ARG)))) | |
9117 | |
9118 switch (code) | |
9119 { | |
9120 case LSHIFT_EXPR: | |
9121 if (code_left == PLUS_EXPR || code_right == PLUS_EXPR) | |
9122 warning (OPT_Wparentheses, | |
9123 "suggest parentheses around %<+%> inside %<<<%>"); | |
9124 else if (code_left == MINUS_EXPR || code_right == MINUS_EXPR) | |
9125 warning (OPT_Wparentheses, | |
9126 "suggest parentheses around %<-%> inside %<<<%>"); | |
9127 return; | |
9128 | |
9129 case RSHIFT_EXPR: | |
9130 if (code_left == PLUS_EXPR || code_right == PLUS_EXPR) | |
9131 warning (OPT_Wparentheses, | |
9132 "suggest parentheses around %<+%> inside %<>>%>"); | |
9133 else if (code_left == MINUS_EXPR || code_right == MINUS_EXPR) | |
9134 warning (OPT_Wparentheses, | |
9135 "suggest parentheses around %<-%> inside %<>>%>"); | |
9136 return; | |
9137 | |
9138 case TRUTH_ORIF_EXPR: | |
9139 if (code_left == TRUTH_ANDIF_EXPR || code_right == TRUTH_ANDIF_EXPR) | |
9140 warning (OPT_Wparentheses, | |
9141 "suggest parentheses around %<&&%> within %<||%>"); | |
9142 return; | |
9143 | |
9144 case BIT_IOR_EXPR: | |
9145 if (code_left == BIT_AND_EXPR || code_left == BIT_XOR_EXPR | |
9146 || code_left == PLUS_EXPR || code_left == MINUS_EXPR | |
9147 || code_right == BIT_AND_EXPR || code_right == BIT_XOR_EXPR | |
9148 || code_right == PLUS_EXPR || code_right == MINUS_EXPR) | |
9149 warning (OPT_Wparentheses, | |
9150 "suggest parentheses around arithmetic in operand of %<|%>"); | |
9151 /* Check cases like x|y==z */ | |
9152 else if (TREE_CODE_CLASS (code_left) == tcc_comparison | |
9153 || TREE_CODE_CLASS (code_right) == tcc_comparison) | |
9154 warning (OPT_Wparentheses, | |
9155 "suggest parentheses around comparison in operand of %<|%>"); | |
9156 /* Check cases like !x | y */ | |
9157 else if (code_left == TRUTH_NOT_EXPR | |
9158 && !APPEARS_TO_BE_BOOLEAN_EXPR_P (code_right, arg_right)) | |
9159 warning (OPT_Wparentheses, "suggest parentheses around operand of " | |
9160 "%<!%> or change %<|%> to %<||%> or %<!%> to %<~%>"); | |
9161 return; | |
9162 | |
9163 case BIT_XOR_EXPR: | |
9164 if (code_left == BIT_AND_EXPR | |
9165 || code_left == PLUS_EXPR || code_left == MINUS_EXPR | |
9166 || code_right == BIT_AND_EXPR | |
9167 || code_right == PLUS_EXPR || code_right == MINUS_EXPR) | |
9168 warning (OPT_Wparentheses, | |
9169 "suggest parentheses around arithmetic in operand of %<^%>"); | |
9170 /* Check cases like x^y==z */ | |
9171 else if (TREE_CODE_CLASS (code_left) == tcc_comparison | |
9172 || TREE_CODE_CLASS (code_right) == tcc_comparison) | |
9173 warning (OPT_Wparentheses, | |
9174 "suggest parentheses around comparison in operand of %<^%>"); | |
9175 return; | |
9176 | |
9177 case BIT_AND_EXPR: | |
9178 if (code_left == PLUS_EXPR || code_right == PLUS_EXPR) | |
9179 warning (OPT_Wparentheses, | |
9180 "suggest parentheses around %<+%> in operand of %<&%>"); | |
9181 else if (code_left == MINUS_EXPR || code_right == MINUS_EXPR) | |
9182 warning (OPT_Wparentheses, | |
9183 "suggest parentheses around %<-%> in operand of %<&%>"); | |
9184 /* Check cases like x&y==z */ | |
9185 else if (TREE_CODE_CLASS (code_left) == tcc_comparison | |
9186 || TREE_CODE_CLASS (code_right) == tcc_comparison) | |
9187 warning (OPT_Wparentheses, | |
9188 "suggest parentheses around comparison in operand of %<&%>"); | |
9189 /* Check cases like !x & y */ | |
9190 else if (code_left == TRUTH_NOT_EXPR | |
9191 && !APPEARS_TO_BE_BOOLEAN_EXPR_P (code_right, arg_right)) | |
9192 warning (OPT_Wparentheses, "suggest parentheses around operand of " | |
9193 "%<!%> or change %<&%> to %<&&%> or %<!%> to %<~%>"); | |
9194 return; | |
9195 | |
9196 case EQ_EXPR: | |
9197 if (TREE_CODE_CLASS (code_left) == tcc_comparison | |
9198 || TREE_CODE_CLASS (code_right) == tcc_comparison) | |
9199 warning (OPT_Wparentheses, | |
9200 "suggest parentheses around comparison in operand of %<==%>"); | |
9201 return; | |
9202 case NE_EXPR: | |
9203 if (TREE_CODE_CLASS (code_left) == tcc_comparison | |
9204 || TREE_CODE_CLASS (code_right) == tcc_comparison) | |
9205 warning (OPT_Wparentheses, | |
9206 "suggest parentheses around comparison in operand of %<!=%>"); | |
9207 return; | |
9208 | |
9209 default: | |
9210 if (TREE_CODE_CLASS (code) == tcc_comparison | |
9211 && ((TREE_CODE_CLASS (code_left) == tcc_comparison | |
9212 && code_left != NE_EXPR && code_left != EQ_EXPR | |
9213 && INTEGRAL_TYPE_P (TREE_TYPE (arg_left))) | |
9214 || (TREE_CODE_CLASS (code_right) == tcc_comparison | |
9215 && code_right != NE_EXPR && code_right != EQ_EXPR | |
9216 && INTEGRAL_TYPE_P (TREE_TYPE (arg_right))))) | |
9217 warning (OPT_Wparentheses, "comparisons like %<X<=Y<=Z%> do not " | |
9218 "have their mathematical meaning"); | |
9219 return; | |
9220 } | |
9221 #undef NOT_A_BOOLEAN_EXPR_P | |
9222 } | |
9223 | |
9224 /* If LABEL (a LABEL_DECL) has not been used, issue a warning. */ | |
9225 | |
9226 void | |
9227 warn_for_unused_label (tree label) | |
9228 { | |
9229 if (!TREE_USED (label)) | |
9230 { | |
9231 if (DECL_INITIAL (label)) | |
9232 warning (OPT_Wunused_label, "label %q+D defined but not used", label); | |
9233 else | |
9234 warning (OPT_Wunused_label, "label %q+D declared but not defined", label); | |
9235 } | |
9236 } | |
9237 | |
9238 #ifndef TARGET_HAS_TARGETCM | |
9239 struct gcc_targetcm targetcm = TARGETCM_INITIALIZER; | |
9240 #endif | |
9241 | |
9242 /* Warn for division by zero according to the value of DIVISOR. LOC | |
9243 is the location of the division operator. */ | |
9244 | |
9245 void | |
9246 warn_for_div_by_zero (location_t loc, tree divisor) | |
9247 { | |
9248 /* If DIVISOR is zero, and has integral or fixed-point type, issue a warning | |
9249 about division by zero. Do not issue a warning if DIVISOR has a | |
9250 floating-point type, since we consider 0.0/0.0 a valid way of | |
9251 generating a NaN. */ | |
9252 if (c_inhibit_evaluation_warnings == 0 | |
9253 && (integer_zerop (divisor) || fixed_zerop (divisor))) | |
9254 warning_at (loc, OPT_Wdiv_by_zero, "division by zero"); | |
9255 } | |
9256 | |
9257 /* Subroutine of build_binary_op. Give warnings for comparisons | |
9258 between signed and unsigned quantities that may fail. Do the | |
9259 checking based on the original operand trees ORIG_OP0 and ORIG_OP1, | |
9260 so that casts will be considered, but default promotions won't | |
9261 be. | |
9262 | |
9263 LOCATION is the location of the comparison operator. | |
9264 | |
9265 The arguments of this function map directly to local variables | |
9266 of build_binary_op. */ | |
9267 | |
9268 void | |
9269 warn_for_sign_compare (location_t location, | |
9270 tree orig_op0, tree orig_op1, | |
9271 tree op0, tree op1, | |
9272 tree result_type, enum tree_code resultcode) | |
9273 { | |
9274 int op0_signed = !TYPE_UNSIGNED (TREE_TYPE (orig_op0)); | |
9275 int op1_signed = !TYPE_UNSIGNED (TREE_TYPE (orig_op1)); | |
9276 int unsignedp0, unsignedp1; | |
9277 | |
9278 /* In C++, check for comparison of different enum types. */ | |
9279 if (c_dialect_cxx() | |
9280 && TREE_CODE (TREE_TYPE (orig_op0)) == ENUMERAL_TYPE | |
9281 && TREE_CODE (TREE_TYPE (orig_op1)) == ENUMERAL_TYPE | |
9282 && TYPE_MAIN_VARIANT (TREE_TYPE (orig_op0)) | |
9283 != TYPE_MAIN_VARIANT (TREE_TYPE (orig_op1))) | |
9284 { | |
9285 warning_at (location, | |
9286 OPT_Wsign_compare, "comparison between types %qT and %qT", | |
9287 TREE_TYPE (orig_op0), TREE_TYPE (orig_op1)); | |
9288 } | |
9289 | |
9290 /* Do not warn if the comparison is being done in a signed type, | |
9291 since the signed type will only be chosen if it can represent | |
9292 all the values of the unsigned type. */ | |
9293 if (!TYPE_UNSIGNED (result_type)) | |
9294 /* OK */; | |
9295 /* Do not warn if both operands are unsigned. */ | |
9296 else if (op0_signed == op1_signed) | |
9297 /* OK */; | |
9298 else | |
9299 { | |
9300 tree sop, uop, base_type; | |
9301 bool ovf; | |
9302 | |
9303 if (op0_signed) | |
9304 sop = orig_op0, uop = orig_op1; | |
9305 else | |
9306 sop = orig_op1, uop = orig_op0; | |
9307 | |
9308 STRIP_TYPE_NOPS (sop); | |
9309 STRIP_TYPE_NOPS (uop); | |
9310 base_type = (TREE_CODE (result_type) == COMPLEX_TYPE | |
9311 ? TREE_TYPE (result_type) : result_type); | |
9312 | |
9313 /* Do not warn if the signed quantity is an unsuffixed integer | |
9314 literal (or some static constant expression involving such | |
9315 literals or a conditional expression involving such literals) | |
9316 and it is non-negative. */ | |
9317 if (tree_expr_nonnegative_warnv_p (sop, &ovf)) | |
9318 /* OK */; | |
9319 /* Do not warn if the comparison is an equality operation, the | |
9320 unsigned quantity is an integral constant, and it would fit | |
9321 in the result if the result were signed. */ | |
9322 else if (TREE_CODE (uop) == INTEGER_CST | |
9323 && (resultcode == EQ_EXPR || resultcode == NE_EXPR) | |
9324 && int_fits_type_p (uop, c_common_signed_type (base_type))) | |
9325 /* OK */; | |
9326 /* In C, do not warn if the unsigned quantity is an enumeration | |
9327 constant and its maximum value would fit in the result if the | |
9328 result were signed. */ | |
9329 else if (!c_dialect_cxx() && TREE_CODE (uop) == INTEGER_CST | |
9330 && TREE_CODE (TREE_TYPE (uop)) == ENUMERAL_TYPE | |
9331 && int_fits_type_p (TYPE_MAX_VALUE (TREE_TYPE (uop)), | |
9332 c_common_signed_type (base_type))) | |
9333 /* OK */; | |
9334 else | |
9335 warning_at (location, | |
9336 OPT_Wsign_compare, | |
9337 "comparison between signed and unsigned integer expressions"); | |
9338 } | |
9339 | |
9340 /* Warn if two unsigned values are being compared in a size larger | |
9341 than their original size, and one (and only one) is the result of | |
9342 a `~' operator. This comparison will always fail. | |
9343 | |
9344 Also warn if one operand is a constant, and the constant does not | |
9345 have all bits set that are set in the ~ operand when it is | |
9346 extended. */ | |
9347 | |
9348 op0 = get_narrower (op0, &unsignedp0); | |
9349 op1 = get_narrower (op1, &unsignedp1); | |
9350 | |
9351 if ((TREE_CODE (op0) == BIT_NOT_EXPR) | |
9352 ^ (TREE_CODE (op1) == BIT_NOT_EXPR)) | |
9353 { | |
9354 if (TREE_CODE (op0) == BIT_NOT_EXPR) | |
9355 op0 = get_narrower (TREE_OPERAND (op0, 0), &unsignedp0); | |
9356 if (TREE_CODE (op1) == BIT_NOT_EXPR) | |
9357 op1 = get_narrower (TREE_OPERAND (op1, 0), &unsignedp1); | |
9358 | |
9359 if (host_integerp (op0, 0) || host_integerp (op1, 0)) | |
9360 { | |
9361 tree primop; | |
9362 HOST_WIDE_INT constant, mask; | |
9363 int unsignedp; | |
9364 unsigned int bits; | |
9365 | |
9366 if (host_integerp (op0, 0)) | |
9367 { | |
9368 primop = op1; | |
9369 unsignedp = unsignedp1; | |
9370 constant = tree_low_cst (op0, 0); | |
9371 } | |
9372 else | |
9373 { | |
9374 primop = op0; | |
9375 unsignedp = unsignedp0; | |
9376 constant = tree_low_cst (op1, 0); | |
9377 } | |
9378 | |
9379 bits = TYPE_PRECISION (TREE_TYPE (primop)); | |
9380 if (bits < TYPE_PRECISION (result_type) | |
9381 && bits < HOST_BITS_PER_LONG && unsignedp) | |
9382 { | |
9383 mask = (~ (HOST_WIDE_INT) 0) << bits; | |
9384 if ((mask & constant) != mask) | |
9385 { | |
9386 if (constant == 0) | |
9387 warning (OPT_Wsign_compare, | |
9388 "promoted ~unsigned is always non-zero"); | |
9389 else | |
9390 warning_at (location, OPT_Wsign_compare, | |
9391 "comparison of promoted ~unsigned with constant"); | |
9392 } | |
9393 } | |
9394 } | |
9395 else if (unsignedp0 && unsignedp1 | |
9396 && (TYPE_PRECISION (TREE_TYPE (op0)) | |
9397 < TYPE_PRECISION (result_type)) | |
9398 && (TYPE_PRECISION (TREE_TYPE (op1)) | |
9399 < TYPE_PRECISION (result_type))) | |
9400 warning_at (location, OPT_Wsign_compare, | |
9401 "comparison of promoted ~unsigned with unsigned"); | |
9402 } | |
9403 } | |
9404 | |
9405 /* RESULT_TYPE is the result of converting TYPE1 and TYPE2 to a common | |
9406 type via c_common_type. If -Wdouble-promotion is in use, and the | |
9407 conditions for warning have been met, issue a warning. GMSGID is | |
9408 the warning message. It must have two %T specifiers for the type | |
9409 that was converted (generally "float") and the type to which it was | |
9410 converted (generally "double), respectively. LOC is the location | |
9411 to which the awrning should refer. */ | |
9412 | |
9413 void | |
9414 do_warn_double_promotion (tree result_type, tree type1, tree type2, | |
9415 const char *gmsgid, location_t loc) | |
9416 { | |
9417 tree source_type; | |
9418 | |
9419 if (!warn_double_promotion) | |
9420 return; | |
9421 /* If the conversion will not occur at run-time, there is no need to | |
9422 warn about it. */ | |
9423 if (c_inhibit_evaluation_warnings) | |
9424 return; | |
9425 if (TYPE_MAIN_VARIANT (result_type) != double_type_node | |
9426 && TYPE_MAIN_VARIANT (result_type) != complex_double_type_node) | |
9427 return; | |
9428 if (TYPE_MAIN_VARIANT (type1) == float_type_node | |
9429 || TYPE_MAIN_VARIANT (type1) == complex_float_type_node) | |
9430 source_type = type1; | |
9431 else if (TYPE_MAIN_VARIANT (type2) == float_type_node | |
9432 || TYPE_MAIN_VARIANT (type2) == complex_float_type_node) | |
9433 source_type = type2; | |
9434 else | |
9435 return; | |
9436 warning_at (loc, OPT_Wdouble_promotion, gmsgid, source_type, result_type); | |
9437 } | |
9438 | |
9439 /* Setup a TYPE_DECL node as a typedef representation. | |
9440 | |
9441 X is a TYPE_DECL for a typedef statement. Create a brand new | |
9442 ..._TYPE node (which will be just a variant of the existing | |
9443 ..._TYPE node with identical properties) and then install X | |
9444 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node. | |
9445 | |
9446 The whole point here is to end up with a situation where each | |
9447 and every ..._TYPE node the compiler creates will be uniquely | |
9448 associated with AT MOST one node representing a typedef name. | |
9449 This way, even though the compiler substitutes corresponding | |
9450 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very | |
9451 early on, later parts of the compiler can always do the reverse | |
9452 translation and get back the corresponding typedef name. For | |
9453 example, given: | |
9454 | |
9455 typedef struct S MY_TYPE; | |
9456 MY_TYPE object; | |
9457 | |
9458 Later parts of the compiler might only know that `object' was of | |
9459 type `struct S' if it were not for code just below. With this | |
9460 code however, later parts of the compiler see something like: | |
9461 | |
9462 struct S' == struct S | |
9463 typedef struct S' MY_TYPE; | |
9464 struct S' object; | |
9465 | |
9466 And they can then deduce (from the node for type struct S') that | |
9467 the original object declaration was: | |
9468 | |
9469 MY_TYPE object; | |
9470 | |
9471 Being able to do this is important for proper support of protoize, | |
9472 and also for generating precise symbolic debugging information | |
9473 which takes full account of the programmer's (typedef) vocabulary. | |
9474 | |
9475 Obviously, we don't want to generate a duplicate ..._TYPE node if | |
9476 the TYPE_DECL node that we are now processing really represents a | |
9477 standard built-in type. */ | |
9478 | |
9479 void | |
9480 set_underlying_type (tree x) | |
9481 { | |
9482 if (x == error_mark_node) | |
9483 return; | |
9484 if (DECL_IS_BUILTIN (x)) | |
9485 { | |
9486 if (TYPE_NAME (TREE_TYPE (x)) == 0) | |
9487 TYPE_NAME (TREE_TYPE (x)) = x; | |
9488 } | |
9489 else if (TREE_TYPE (x) != error_mark_node | |
9490 && DECL_ORIGINAL_TYPE (x) == NULL_TREE) | |
9491 { | |
9492 tree tt = TREE_TYPE (x); | |
9493 DECL_ORIGINAL_TYPE (x) = tt; | |
9494 tt = build_variant_type_copy (tt); | |
9495 TYPE_STUB_DECL (tt) = TYPE_STUB_DECL (DECL_ORIGINAL_TYPE (x)); | |
9496 TYPE_NAME (tt) = x; | |
9497 TREE_USED (tt) = TREE_USED (x); | |
9498 TREE_TYPE (x) = tt; | |
9499 } | |
9500 } | |
9501 | |
9502 /* Record the types used by the current global variable declaration | |
9503 being parsed, so that we can decide later to emit their debug info. | |
9504 Those types are in types_used_by_cur_var_decl, and we are going to | |
9505 store them in the types_used_by_vars_hash hash table. | |
9506 DECL is the declaration of the global variable that has been parsed. */ | |
9507 | |
9508 void | |
9509 record_types_used_by_current_var_decl (tree decl) | |
9510 { | |
9511 gcc_assert (decl && DECL_P (decl) && TREE_STATIC (decl)); | |
9512 | |
9513 while (!VEC_empty (tree, types_used_by_cur_var_decl)) | |
9514 { | |
9515 tree type = VEC_pop (tree, types_used_by_cur_var_decl); | |
9516 types_used_by_var_decl_insert (type, decl); | |
9517 } | |
9518 } | |
9519 | |
9520 /* The C and C++ parsers both use vectors to hold function arguments. | |
9521 For efficiency, we keep a cache of unused vectors. This is the | |
9522 cache. */ | |
9523 | |
9524 typedef VEC(tree,gc)* tree_gc_vec; | |
9525 DEF_VEC_P(tree_gc_vec); | |
9526 DEF_VEC_ALLOC_P(tree_gc_vec,gc); | |
9527 static GTY((deletable)) VEC(tree_gc_vec,gc) *tree_vector_cache; | |
9528 | |
9529 /* Return a new vector from the cache. If the cache is empty, | |
9530 allocate a new vector. These vectors are GC'ed, so it is OK if the | |
9531 pointer is not released.. */ | |
9532 | |
9533 VEC(tree,gc) * | |
9534 make_tree_vector (void) | |
9535 { | |
9536 if (!VEC_empty (tree_gc_vec, tree_vector_cache)) | |
9537 return VEC_pop (tree_gc_vec, tree_vector_cache); | |
9538 else | |
9539 { | |
9540 /* Passing 0 to VEC_alloc returns NULL, and our callers require | |
9541 that we always return a non-NULL value. The vector code uses | |
9542 4 when growing a NULL vector, so we do too. */ | |
9543 return VEC_alloc (tree, gc, 4); | |
9544 } | |
9545 } | |
9546 | |
9547 /* Release a vector of trees back to the cache. */ | |
9548 | |
9549 void | |
9550 release_tree_vector (VEC(tree,gc) *vec) | |
9551 { | |
9552 if (vec != NULL) | |
9553 { | |
9554 VEC_truncate (tree, vec, 0); | |
9555 VEC_safe_push (tree_gc_vec, gc, tree_vector_cache, vec); | |
9556 } | |
9557 } | |
9558 | |
9559 /* Get a new tree vector holding a single tree. */ | |
9560 | |
9561 VEC(tree,gc) * | |
9562 make_tree_vector_single (tree t) | |
9563 { | |
9564 VEC(tree,gc) *ret = make_tree_vector (); | |
9565 VEC_quick_push (tree, ret, t); | |
9566 return ret; | |
9567 } | |
9568 | |
9569 /* Get a new tree vector which is a copy of an existing one. */ | |
9570 | |
9571 VEC(tree,gc) * | |
9572 make_tree_vector_copy (const VEC(tree,gc) *orig) | |
9573 { | |
9574 VEC(tree,gc) *ret; | |
9575 unsigned int ix; | |
9576 tree t; | |
9577 | |
9578 ret = make_tree_vector (); | |
9579 VEC_reserve (tree, gc, ret, VEC_length (tree, orig)); | |
9580 FOR_EACH_VEC_ELT (tree, orig, ix, t) | |
9581 VEC_quick_push (tree, ret, t); | |
9582 return ret; | |
9583 } | |
9584 | |
9585 /* Return true if KEYWORD starts a type specifier. */ | |
9586 | |
9587 bool | |
9588 keyword_begins_type_specifier (enum rid keyword) | |
9589 { | |
9590 switch (keyword) | |
9591 { | |
9592 case RID_INT: | |
9593 case RID_CHAR: | |
9594 case RID_FLOAT: | |
9595 case RID_DOUBLE: | |
9596 case RID_VOID: | |
9597 case RID_INT128: | |
9598 case RID_UNSIGNED: | |
9599 case RID_LONG: | |
9600 case RID_SHORT: | |
9601 case RID_SIGNED: | |
9602 case RID_DFLOAT32: | |
9603 case RID_DFLOAT64: | |
9604 case RID_DFLOAT128: | |
9605 case RID_FRACT: | |
9606 case RID_ACCUM: | |
9607 case RID_BOOL: | |
9608 case RID_WCHAR: | |
9609 case RID_CHAR16: | |
9610 case RID_CHAR32: | |
9611 case RID_SAT: | |
9612 case RID_COMPLEX: | |
9613 case RID_TYPEOF: | |
9614 case RID_STRUCT: | |
9615 case RID_CLASS: | |
9616 case RID_UNION: | |
9617 case RID_ENUM: | |
9618 return true; | |
9619 default: | |
9620 return false; | |
9621 } | |
9622 } | |
9623 | |
9624 /* Return true if KEYWORD names a type qualifier. */ | |
9625 | |
9626 bool | |
9627 keyword_is_type_qualifier (enum rid keyword) | |
9628 { | |
9629 switch (keyword) | |
9630 { | |
9631 case RID_CONST: | |
9632 case RID_VOLATILE: | |
9633 case RID_RESTRICT: | |
9634 return true; | |
9635 default: | |
9636 return false; | |
9637 } | |
9638 } | |
9639 | |
9640 /* Return true if KEYWORD names a storage class specifier. | |
9641 | |
9642 RID_TYPEDEF is not included in this list despite `typedef' being | |
9643 listed in C99 6.7.1.1. 6.7.1.3 indicates that `typedef' is listed as | |
9644 such for syntactic convenience only. */ | |
9645 | |
9646 bool | |
9647 keyword_is_storage_class_specifier (enum rid keyword) | |
9648 { | |
9649 switch (keyword) | |
9650 { | |
9651 case RID_STATIC: | |
9652 case RID_EXTERN: | |
9653 case RID_REGISTER: | |
9654 case RID_AUTO: | |
9655 case RID_MUTABLE: | |
9656 case RID_THREAD: | |
9657 return true; | |
9658 default: | |
9659 return false; | |
9660 } | |
9661 } | |
9662 | |
9663 /* Return true if KEYWORD names a function-specifier [dcl.fct.spec]. */ | |
9664 | |
9665 static bool | |
9666 keyword_is_function_specifier (enum rid keyword) | |
9667 { | |
9668 switch (keyword) | |
9669 { | |
9670 case RID_INLINE: | |
9671 case RID_VIRTUAL: | |
9672 case RID_EXPLICIT: | |
9673 return true; | |
9674 default: | |
9675 return false; | |
9676 } | |
9677 } | |
9678 | |
9679 /* Return true if KEYWORD names a decl-specifier [dcl.spec] or a | |
9680 declaration-specifier (C99 6.7). */ | |
9681 | |
9682 bool | |
9683 keyword_is_decl_specifier (enum rid keyword) | |
9684 { | |
9685 if (keyword_is_storage_class_specifier (keyword) | |
9686 || keyword_is_type_qualifier (keyword) | |
9687 || keyword_is_function_specifier (keyword)) | |
9688 return true; | |
9689 | |
9690 switch (keyword) | |
9691 { | |
9692 case RID_TYPEDEF: | |
9693 case RID_FRIEND: | |
9694 case RID_CONSTEXPR: | |
9695 return true; | |
9696 default: | |
9697 return false; | |
9698 } | |
9699 } | |
9700 | |
9701 #include "gt-c-family-c-common.h" |