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
4 Free Software Foundation, Inc.
6 This file is part of GCC.
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
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
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/>. */
24 #include "coretypes.h"
33 #include "expr.h" /* For vector_mode_valid_p */
39 #include "langhooks.h"
40 #include "tree-inline.h"
43 #include "diagnostic.h"
44 #include "tree-iterator.h"
46 #include "tree-mudflap.h"
50 #include "target-def.h"
51 #include "fixed-value.h"
54 cpp_reader *parse_in; /* Declared in c-pragma.h. */
56 /* The following symbols are subsumed in the c_global_trees array, and
57 listed here individually for documentation purposes.
59 INTEGER_TYPE and REAL_TYPE nodes for the standard data types.
61 tree short_integer_type_node;
62 tree long_integer_type_node;
63 tree long_long_integer_type_node;
65 tree short_unsigned_type_node;
66 tree long_unsigned_type_node;
67 tree long_long_unsigned_type_node;
69 tree truthvalue_type_node;
70 tree truthvalue_false_node;
71 tree truthvalue_true_node;
73 tree ptrdiff_type_node;
75 tree unsigned_char_type_node;
76 tree signed_char_type_node;
79 tree char16_type_node;
80 tree char32_type_node;
83 tree double_type_node;
84 tree long_double_type_node;
86 tree complex_integer_type_node;
87 tree complex_float_type_node;
88 tree complex_double_type_node;
89 tree complex_long_double_type_node;
91 tree dfloat32_type_node;
92 tree dfloat64_type_node;
93 tree_dfloat128_type_node;
101 tree unsigned_intQI_type_node;
102 tree unsigned_intHI_type_node;
103 tree unsigned_intSI_type_node;
104 tree unsigned_intDI_type_node;
105 tree unsigned_intTI_type_node;
107 tree widest_integer_literal_type_node;
108 tree widest_unsigned_literal_type_node;
110 Nodes for types `void *' and `const void *'.
112 tree ptr_type_node, const_ptr_type_node;
114 Nodes for types `char *' and `const char *'.
116 tree string_type_node, const_string_type_node;
118 Type `char[SOMENUMBER]'.
119 Used when an array of char is needed and the size is irrelevant.
121 tree char_array_type_node;
123 Type `int[SOMENUMBER]' or something like it.
124 Used when an array of int needed and the size is irrelevant.
126 tree int_array_type_node;
128 Type `wchar_t[SOMENUMBER]' or something like it.
129 Used when a wide string literal is created.
131 tree wchar_array_type_node;
133 Type `char16_t[SOMENUMBER]' or something like it.
134 Used when a UTF-16 string literal is created.
136 tree char16_array_type_node;
138 Type `char32_t[SOMENUMBER]' or something like it.
139 Used when a UTF-32 string literal is created.
141 tree char32_array_type_node;
143 Type `int ()' -- used for implicit declaration of functions.
145 tree default_function_type;
147 A VOID_TYPE node, packaged in a TREE_LIST.
151 The lazily created VAR_DECLs for __FUNCTION__, __PRETTY_FUNCTION__,
152 and __func__. (C doesn't generate __FUNCTION__ and__PRETTY_FUNCTION__
153 VAR_DECLS, but C++ does.)
155 tree function_name_decl_node;
156 tree pretty_function_name_decl_node;
157 tree c99_function_name_decl_node;
159 Stack of nested function name VAR_DECLs.
161 tree saved_function_name_decls;
165 tree c_global_trees[CTI_MAX];
167 /* Switches common to the C front ends. */
169 /* Nonzero if preprocessing only. */
171 int flag_preprocess_only;
173 /* Nonzero means don't output line number information. */
175 char flag_no_line_commands;
177 /* Nonzero causes -E output not to be done, but directives such as
178 #define that have side effects are still obeyed. */
182 /* Nonzero means dump macros in some fashion. */
184 char flag_dump_macros;
186 /* Nonzero means pass #include lines through to the output. */
188 char flag_dump_includes;
190 /* Nonzero means process PCH files while preprocessing. */
192 bool flag_pch_preprocess;
194 /* The file name to which we should write a precompiled header, or
195 NULL if no header will be written in this compile. */
197 const char *pch_file;
199 /* Nonzero if an ISO standard was selected. It rejects macros in the
203 /* Nonzero if -undef was given. It suppresses target built-in macros
207 /* Nonzero means don't recognize the non-ANSI builtin functions. */
211 /* Nonzero means don't recognize the non-ANSI builtin functions.
214 int flag_no_nonansi_builtin;
216 /* Nonzero means give `double' the same size as `float'. */
218 int flag_short_double;
220 /* Nonzero means give `wchar_t' the same size as `short'. */
222 int flag_short_wchar;
224 /* Nonzero means allow implicit conversions between vectors with
225 differing numbers of subparts and/or differing element types. */
226 int flag_lax_vector_conversions;
228 /* Nonzero means allow Microsoft extensions without warnings or errors. */
229 int flag_ms_extensions;
231 /* Nonzero means don't recognize the keyword `asm'. */
235 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
237 int flag_signed_bitfields = 1;
239 /* Warn about #pragma directives that are not recognized. */
241 int warn_unknown_pragmas; /* Tri state variable. */
243 /* Warn about format/argument anomalies in calls to formatted I/O functions
244 (*printf, *scanf, strftime, strfmon, etc.). */
248 /* Warn about using __null (as NULL in C++) as sentinel. For code compiled
249 with GCC this doesn't matter as __null is guaranteed to have the right
252 int warn_strict_null_sentinel;
254 /* Zero means that faster, ...NonNil variants of objc_msgSend...
255 calls will be used in ObjC; passing nil receivers to such calls
256 will most likely result in crashes. */
257 int flag_nil_receivers = 1;
259 /* Nonzero means that code generation will be altered to support
260 "zero-link" execution. This currently affects ObjC only, but may
261 affect other languages in the future. */
262 int flag_zero_link = 0;
264 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
265 unit. It will inform the ObjC runtime that class definition(s) herein
266 contained are to replace one(s) previously loaded. */
267 int flag_replace_objc_classes = 0;
269 /* C/ObjC language option variables. */
272 /* Nonzero means allow type mismatches in conditional expressions;
273 just make their values `void'. */
275 int flag_cond_mismatch;
277 /* Nonzero means enable C89 Amendment 1 features. */
281 /* Nonzero means use the ISO C99 (or C1X) dialect of C. */
285 /* Nonzero means use the ISO C1X dialect of C. */
289 /* Nonzero means that we have builtin functions, and main is an int. */
294 /* ObjC language option variables. */
297 /* Open and close the file for outputting class declarations, if
300 int flag_gen_declaration;
302 /* Tells the compiler that this is a special run. Do not perform any
303 compiling, instead we are to test some platform dependent features
304 and output a C header file with appropriate definitions. */
306 int print_struct_values;
308 /* Tells the compiler what is the constant string class for ObjC. */
310 const char *constant_string_class_name;
313 /* C++ language option variables. */
316 /* Nonzero means don't recognize any extension keywords. */
318 int flag_no_gnu_keywords;
320 /* Nonzero means do emit exported implementations of functions even if
321 they can be inlined. */
323 int flag_implement_inlines = 1;
325 /* Nonzero means that implicit instantiations will be emitted if needed. */
327 int flag_implicit_templates = 1;
329 /* Nonzero means that implicit instantiations of inline templates will be
330 emitted if needed, even if instantiations of non-inline templates
333 int flag_implicit_inline_templates = 1;
335 /* Nonzero means generate separate instantiation control files and
336 juggle them at link time. */
338 int flag_use_repository;
340 /* Nonzero if we want to issue diagnostics that the standard says are not
343 int flag_optional_diags = 1;
345 /* Nonzero means we should attempt to elide constructors when possible. */
347 int flag_elide_constructors = 1;
349 /* Nonzero means that member functions defined in class scope are
350 inline by default. */
352 int flag_default_inline = 1;
354 /* Controls whether compiler generates 'type descriptor' that give
355 run-time type information. */
359 /* Nonzero if we want to conserve space in the .o files. We do this
360 by putting uninitialized data and runtime initialized data into
361 .common instead of .data at the expense of not flagging multiple
364 int flag_conserve_space;
366 /* Nonzero if we want to obey access control semantics. */
368 int flag_access_control = 1;
370 /* Nonzero if we want to check the return value of new and avoid calling
371 constructors if it is a null pointer. */
375 /* The C++ dialect being used. C++98 is the default. */
377 enum cxx_dialect cxx_dialect = cxx98;
379 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
380 initialization variables.
381 0: Old rules, set by -fno-for-scope.
382 2: New ISO rules, set by -ffor-scope.
383 1: Try to implement new ISO rules, but with backup compatibility
384 (and warnings). This is the default, for now. */
386 int flag_new_for_scope = 1;
388 /* Nonzero if we want to emit defined symbols with common-like linkage as
389 weak symbols where possible, in order to conform to C++ semantics.
390 Otherwise, emit them as local symbols. */
394 /* 0 means we want the preprocessor to not emit line directives for
395 the current working directory. 1 means we want it to do it. -1
396 means we should decide depending on whether debugging information
397 is being emitted or not. */
399 int flag_working_directory = -1;
401 /* Nonzero to use __cxa_atexit, rather than atexit, to register
402 destructors for local statics and global objects. '2' means it has been
403 set nonzero as a default, not by a command-line flag. */
405 int flag_use_cxa_atexit = DEFAULT_USE_CXA_ATEXIT;
407 /* Nonzero to use __cxa_get_exception_ptr in C++ exception-handling
408 code. '2' means it has not been set explicitly on the command line. */
410 int flag_use_cxa_get_exception_ptr = 2;
412 /* Nonzero means to implement standard semantics for exception
413 specifications, calling unexpected if an exception is thrown that
414 doesn't match the specification. Zero means to treat them as
415 assertions and optimize accordingly, but not check them. */
417 int flag_enforce_eh_specs = 1;
419 /* Nonzero means to generate thread-safe code for initializing local
422 int flag_threadsafe_statics = 1;
424 /* Nonzero if we want to pretty-print template specializations as the
425 template signature followed by the arguments. */
427 int flag_pretty_templates = 1;
429 /* Maximum template instantiation depth. This limit exists to limit the
430 time it takes to notice infinite template instantiations; the default
431 value of 1024 is likely to be in the next C++ standard. */
433 int max_tinst_depth = 1024;
437 /* The elements of `ridpointers' are identifier nodes for the reserved
438 type names and storage classes. It is indexed by a RID_... value. */
441 tree (*make_fname_decl) (location_t, tree, int);
443 /* Nonzero means don't warn about problems that occur when the code is
445 int c_inhibit_evaluation_warnings;
447 /* Whether lexing has been completed, so subsequent preprocessor
448 errors should use the compiler's input_location. */
449 bool done_lexing = false;
451 /* Information about how a function name is generated. */
454 tree *const decl; /* pointer to the VAR_DECL. */
455 const unsigned rid; /* RID number for the identifier. */
456 const int pretty; /* How pretty is it? */
459 /* The three ways of getting then name of the current function. */
461 const struct fname_var_t fname_vars[] =
463 /* C99 compliant __func__, must be first. */
464 {&c99_function_name_decl_node, RID_C99_FUNCTION_NAME, 0},
465 /* GCC __FUNCTION__ compliant. */
466 {&function_name_decl_node, RID_FUNCTION_NAME, 0},
467 /* GCC __PRETTY_FUNCTION__ compliant. */
468 {&pretty_function_name_decl_node, RID_PRETTY_FUNCTION_NAME, 1},
472 static tree c_fully_fold_internal (tree expr, bool, bool *, bool *);
473 static tree check_case_value (tree);
474 static bool check_case_bounds (tree, tree, tree *, tree *);
476 static tree handle_packed_attribute (tree *, tree, tree, int, bool *);
477 static tree handle_nocommon_attribute (tree *, tree, tree, int, bool *);
478 static tree handle_common_attribute (tree *, tree, tree, int, bool *);
479 static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *);
480 static tree handle_hot_attribute (tree *, tree, tree, int, bool *);
481 static tree handle_cold_attribute (tree *, tree, tree, int, bool *);
482 static tree handle_noinline_attribute (tree *, tree, tree, int, bool *);
483 static tree handle_noclone_attribute (tree *, tree, tree, int, bool *);
484 static tree handle_always_inline_attribute (tree *, tree, tree, int,
486 static tree handle_gnu_inline_attribute (tree *, tree, tree, int, bool *);
487 static tree handle_artificial_attribute (tree *, tree, tree, int, bool *);
488 static tree handle_flatten_attribute (tree *, tree, tree, int, bool *);
489 static tree handle_error_attribute (tree *, tree, tree, int, bool *);
490 static tree handle_used_attribute (tree *, tree, tree, int, bool *);
491 static tree handle_unused_attribute (tree *, tree, tree, int, bool *);
492 static tree handle_externally_visible_attribute (tree *, tree, tree, int,
494 static tree handle_const_attribute (tree *, tree, tree, int, bool *);
495 static tree handle_transparent_union_attribute (tree *, tree, tree,
497 static tree handle_constructor_attribute (tree *, tree, tree, int, bool *);
498 static tree handle_destructor_attribute (tree *, tree, tree, int, bool *);
499 static tree handle_mode_attribute (tree *, tree, tree, int, bool *);
500 static tree handle_section_attribute (tree *, tree, tree, int, bool *);
501 static tree handle_aligned_attribute (tree *, tree, tree, int, bool *);
502 static tree handle_weak_attribute (tree *, tree, tree, int, bool *) ;
503 static tree handle_alias_attribute (tree *, tree, tree, int, bool *);
504 static tree handle_weakref_attribute (tree *, tree, tree, int, bool *) ;
505 static tree handle_visibility_attribute (tree *, tree, tree, int,
507 static tree handle_tls_model_attribute (tree *, tree, tree, int,
509 static tree handle_no_instrument_function_attribute (tree *, tree,
511 static tree handle_malloc_attribute (tree *, tree, tree, int, bool *);
512 static tree handle_returns_twice_attribute (tree *, tree, tree, int, bool *);
513 static tree handle_no_limit_stack_attribute (tree *, tree, tree, int,
515 static tree handle_pure_attribute (tree *, tree, tree, int, bool *);
516 static tree handle_novops_attribute (tree *, tree, tree, int, bool *);
517 static tree handle_deprecated_attribute (tree *, tree, tree, int,
519 static tree handle_vector_size_attribute (tree *, tree, tree, int,
521 static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *);
522 static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *);
523 static tree handle_cleanup_attribute (tree *, tree, tree, int, bool *);
524 static tree handle_warn_unused_result_attribute (tree *, tree, tree, int,
526 static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *);
527 static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *);
528 static tree handle_alloc_size_attribute (tree *, tree, tree, int, bool *);
529 static tree handle_target_attribute (tree *, tree, tree, int, bool *);
530 static tree handle_optimize_attribute (tree *, tree, tree, int, bool *);
531 static tree handle_fnspec_attribute (tree *, tree, tree, int, bool *);
533 static void check_function_nonnull (tree, int, tree *);
534 static void check_nonnull_arg (void *, tree, unsigned HOST_WIDE_INT);
535 static bool nonnull_check_p (tree, unsigned HOST_WIDE_INT);
536 static bool get_nonnull_operand (tree, unsigned HOST_WIDE_INT *);
537 static int resort_field_decl_cmp (const void *, const void *);
539 /* Reserved words. The third field is a mask: keywords are disabled
540 if they match the mask.
543 C --std=c89: D_C99 | D_CXXONLY | D_OBJC | D_CXX_OBJC
544 C --std=c99: D_CXXONLY | D_OBJC
545 ObjC is like C except that D_OBJC and D_CXX_OBJC are not set
546 C++ --std=c98: D_CONLY | D_CXXOX | D_OBJC
547 C++ --std=c0x: D_CONLY | D_OBJC
548 ObjC++ is like C++ except that D_OBJC is not set
550 If -fno-asm is used, D_ASM is added to the mask. If
551 -fno-gnu-keywords is used, D_EXT is added. If -fno-asm and C in
552 C89 mode, D_EXT89 is added for both -fno-asm and -fno-gnu-keywords.
553 In C with -Wc++-compat, we warn if D_CXXWARN is set. */
555 const struct c_common_resword c_common_reswords[] =
557 { "_Bool", RID_BOOL, D_CONLY },
558 { "_Complex", RID_COMPLEX, 0 },
559 { "_Imaginary", RID_IMAGINARY, D_CONLY },
560 { "_Decimal32", RID_DFLOAT32, D_CONLY | D_EXT },
561 { "_Decimal64", RID_DFLOAT64, D_CONLY | D_EXT },
562 { "_Decimal128", RID_DFLOAT128, D_CONLY | D_EXT },
563 { "_Fract", RID_FRACT, D_CONLY | D_EXT },
564 { "_Accum", RID_ACCUM, D_CONLY | D_EXT },
565 { "_Sat", RID_SAT, D_CONLY | D_EXT },
566 { "_Static_assert", RID_STATIC_ASSERT, D_CONLY },
567 { "__FUNCTION__", RID_FUNCTION_NAME, 0 },
568 { "__PRETTY_FUNCTION__", RID_PRETTY_FUNCTION_NAME, 0 },
569 { "__alignof", RID_ALIGNOF, 0 },
570 { "__alignof__", RID_ALIGNOF, 0 },
571 { "__asm", RID_ASM, 0 },
572 { "__asm__", RID_ASM, 0 },
573 { "__attribute", RID_ATTRIBUTE, 0 },
574 { "__attribute__", RID_ATTRIBUTE, 0 },
575 { "__builtin_choose_expr", RID_CHOOSE_EXPR, D_CONLY },
576 { "__builtin_offsetof", RID_OFFSETOF, 0 },
577 { "__builtin_types_compatible_p", RID_TYPES_COMPATIBLE_P, D_CONLY },
578 { "__builtin_va_arg", RID_VA_ARG, 0 },
579 { "__complex", RID_COMPLEX, 0 },
580 { "__complex__", RID_COMPLEX, 0 },
581 { "__const", RID_CONST, 0 },
582 { "__const__", RID_CONST, 0 },
583 { "__decltype", RID_DECLTYPE, D_CXXONLY },
584 { "__extension__", RID_EXTENSION, 0 },
585 { "__func__", RID_C99_FUNCTION_NAME, 0 },
586 { "__has_nothrow_assign", RID_HAS_NOTHROW_ASSIGN, D_CXXONLY },
587 { "__has_nothrow_constructor", RID_HAS_NOTHROW_CONSTRUCTOR, D_CXXONLY },
588 { "__has_nothrow_copy", RID_HAS_NOTHROW_COPY, D_CXXONLY },
589 { "__has_trivial_assign", RID_HAS_TRIVIAL_ASSIGN, D_CXXONLY },
590 { "__has_trivial_constructor", RID_HAS_TRIVIAL_CONSTRUCTOR, D_CXXONLY },
591 { "__has_trivial_copy", RID_HAS_TRIVIAL_COPY, D_CXXONLY },
592 { "__has_trivial_destructor", RID_HAS_TRIVIAL_DESTRUCTOR, D_CXXONLY },
593 { "__has_virtual_destructor", RID_HAS_VIRTUAL_DESTRUCTOR, D_CXXONLY },
594 { "__is_abstract", RID_IS_ABSTRACT, D_CXXONLY },
595 { "__is_base_of", RID_IS_BASE_OF, D_CXXONLY },
596 { "__is_class", RID_IS_CLASS, D_CXXONLY },
597 { "__is_convertible_to", RID_IS_CONVERTIBLE_TO, D_CXXONLY },
598 { "__is_empty", RID_IS_EMPTY, D_CXXONLY },
599 { "__is_enum", RID_IS_ENUM, D_CXXONLY },
600 { "__is_pod", RID_IS_POD, D_CXXONLY },
601 { "__is_polymorphic", RID_IS_POLYMORPHIC, D_CXXONLY },
602 { "__is_standard_layout", RID_IS_STD_LAYOUT, D_CXXONLY },
603 { "__is_trivial", RID_IS_TRIVIAL, D_CXXONLY },
604 { "__is_union", RID_IS_UNION, D_CXXONLY },
605 { "__imag", RID_IMAGPART, 0 },
606 { "__imag__", RID_IMAGPART, 0 },
607 { "__inline", RID_INLINE, 0 },
608 { "__inline__", RID_INLINE, 0 },
609 { "__label__", RID_LABEL, 0 },
610 { "__null", RID_NULL, 0 },
611 { "__real", RID_REALPART, 0 },
612 { "__real__", RID_REALPART, 0 },
613 { "__restrict", RID_RESTRICT, 0 },
614 { "__restrict__", RID_RESTRICT, 0 },
615 { "__signed", RID_SIGNED, 0 },
616 { "__signed__", RID_SIGNED, 0 },
617 { "__thread", RID_THREAD, 0 },
618 { "__typeof", RID_TYPEOF, 0 },
619 { "__typeof__", RID_TYPEOF, 0 },
620 { "__volatile", RID_VOLATILE, 0 },
621 { "__volatile__", RID_VOLATILE, 0 },
622 { "alignof", RID_ALIGNOF, D_CXXONLY | D_CXX0X | D_CXXWARN },
623 { "asm", RID_ASM, D_ASM },
624 { "auto", RID_AUTO, 0 },
625 { "bool", RID_BOOL, D_CXXONLY | D_CXXWARN },
626 { "break", RID_BREAK, 0 },
627 { "case", RID_CASE, 0 },
628 { "catch", RID_CATCH, D_CXX_OBJC | D_CXXWARN },
629 { "char", RID_CHAR, 0 },
630 { "char16_t", RID_CHAR16, D_CXXONLY | D_CXX0X | D_CXXWARN },
631 { "char32_t", RID_CHAR32, D_CXXONLY | D_CXX0X | D_CXXWARN },
632 { "class", RID_CLASS, D_CXX_OBJC | D_CXXWARN },
633 { "const", RID_CONST, 0 },
634 { "constexpr", RID_CONSTEXPR, D_CXXONLY | D_CXX0X | D_CXXWARN },
635 { "const_cast", RID_CONSTCAST, D_CXXONLY | D_CXXWARN },
636 { "continue", RID_CONTINUE, 0 },
637 { "decltype", RID_DECLTYPE, D_CXXONLY | D_CXX0X | D_CXXWARN },
638 { "default", RID_DEFAULT, 0 },
639 { "delete", RID_DELETE, D_CXXONLY | D_CXXWARN },
641 { "double", RID_DOUBLE, 0 },
642 { "dynamic_cast", RID_DYNCAST, D_CXXONLY | D_CXXWARN },
643 { "else", RID_ELSE, 0 },
644 { "enum", RID_ENUM, 0 },
645 { "explicit", RID_EXPLICIT, D_CXXONLY | D_CXXWARN },
646 { "export", RID_EXPORT, D_CXXONLY | D_CXXWARN },
647 { "extern", RID_EXTERN, 0 },
648 { "false", RID_FALSE, D_CXXONLY | D_CXXWARN },
649 { "float", RID_FLOAT, 0 },
650 { "for", RID_FOR, 0 },
651 { "friend", RID_FRIEND, D_CXXONLY | D_CXXWARN },
652 { "goto", RID_GOTO, 0 },
654 { "inline", RID_INLINE, D_EXT89 },
655 { "int", RID_INT, 0 },
656 { "long", RID_LONG, 0 },
657 { "mutable", RID_MUTABLE, D_CXXONLY | D_CXXWARN },
658 { "namespace", RID_NAMESPACE, D_CXXONLY | D_CXXWARN },
659 { "new", RID_NEW, D_CXXONLY | D_CXXWARN },
660 { "nullptr", RID_NULLPTR, D_CXXONLY | D_CXX0X | D_CXXWARN },
661 { "operator", RID_OPERATOR, D_CXXONLY | D_CXXWARN },
662 { "private", RID_PRIVATE, D_CXX_OBJC | D_CXXWARN },
663 { "protected", RID_PROTECTED, D_CXX_OBJC | D_CXXWARN },
664 { "public", RID_PUBLIC, D_CXX_OBJC | D_CXXWARN },
665 { "register", RID_REGISTER, 0 },
666 { "reinterpret_cast", RID_REINTCAST, D_CXXONLY | D_CXXWARN },
667 { "restrict", RID_RESTRICT, D_CONLY | D_C99 },
668 { "return", RID_RETURN, 0 },
669 { "short", RID_SHORT, 0 },
670 { "signed", RID_SIGNED, 0 },
671 { "sizeof", RID_SIZEOF, 0 },
672 { "static", RID_STATIC, 0 },
673 { "static_assert", RID_STATIC_ASSERT, D_CXXONLY | D_CXX0X | D_CXXWARN },
674 { "static_cast", RID_STATCAST, D_CXXONLY | D_CXXWARN },
675 { "struct", RID_STRUCT, 0 },
676 { "switch", RID_SWITCH, 0 },
677 { "template", RID_TEMPLATE, D_CXXONLY | D_CXXWARN },
678 { "this", RID_THIS, D_CXXONLY | D_CXXWARN },
679 { "throw", RID_THROW, D_CXX_OBJC | D_CXXWARN },
680 { "true", RID_TRUE, D_CXXONLY | D_CXXWARN },
681 { "try", RID_TRY, D_CXX_OBJC | D_CXXWARN },
682 { "typedef", RID_TYPEDEF, 0 },
683 { "typename", RID_TYPENAME, D_CXXONLY | D_CXXWARN },
684 { "typeid", RID_TYPEID, D_CXXONLY | D_CXXWARN },
685 { "typeof", RID_TYPEOF, D_ASM | D_EXT },
686 { "union", RID_UNION, 0 },
687 { "unsigned", RID_UNSIGNED, 0 },
688 { "using", RID_USING, D_CXXONLY | D_CXXWARN },
689 { "virtual", RID_VIRTUAL, D_CXXONLY | D_CXXWARN },
690 { "void", RID_VOID, 0 },
691 { "volatile", RID_VOLATILE, 0 },
692 { "wchar_t", RID_WCHAR, D_CXXONLY },
693 { "while", RID_WHILE, 0 },
694 /* These Objective-C keywords are recognized only immediately after
696 { "compatibility_alias", RID_AT_ALIAS, D_OBJC },
697 { "defs", RID_AT_DEFS, D_OBJC },
698 { "encode", RID_AT_ENCODE, D_OBJC },
699 { "end", RID_AT_END, D_OBJC },
700 { "implementation", RID_AT_IMPLEMENTATION, D_OBJC },
701 { "interface", RID_AT_INTERFACE, D_OBJC },
702 { "protocol", RID_AT_PROTOCOL, D_OBJC },
703 { "selector", RID_AT_SELECTOR, D_OBJC },
704 { "finally", RID_AT_FINALLY, D_OBJC },
705 { "synchronized", RID_AT_SYNCHRONIZED, D_OBJC },
706 /* These are recognized only in protocol-qualifier context
708 { "bycopy", RID_BYCOPY, D_OBJC },
709 { "byref", RID_BYREF, D_OBJC },
710 { "in", RID_IN, D_OBJC },
711 { "inout", RID_INOUT, D_OBJC },
712 { "oneway", RID_ONEWAY, D_OBJC },
713 { "out", RID_OUT, D_OBJC },
715 #ifdef TARGET_ADDR_SPACE_KEYWORDS
716 /* Any address space keywords recognized by the target. */
717 TARGET_ADDR_SPACE_KEYWORDS,
721 const unsigned int num_c_common_reswords =
722 sizeof c_common_reswords / sizeof (struct c_common_resword);
724 /* Table of machine-independent attributes common to all C-like languages. */
725 const struct attribute_spec c_common_attribute_table[] =
727 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
728 { "packed", 0, 0, false, false, false,
729 handle_packed_attribute },
730 { "nocommon", 0, 0, true, false, false,
731 handle_nocommon_attribute },
732 { "common", 0, 0, true, false, false,
733 handle_common_attribute },
734 /* FIXME: logically, noreturn attributes should be listed as
735 "false, true, true" and apply to function types. But implementing this
736 would require all the places in the compiler that use TREE_THIS_VOLATILE
737 on a decl to identify non-returning functions to be located and fixed
738 to check the function type instead. */
739 { "noreturn", 0, 0, true, false, false,
740 handle_noreturn_attribute },
741 { "volatile", 0, 0, true, false, false,
742 handle_noreturn_attribute },
743 { "noinline", 0, 0, true, false, false,
744 handle_noinline_attribute },
745 { "noclone", 0, 0, true, false, false,
746 handle_noclone_attribute },
747 { "always_inline", 0, 0, true, false, false,
748 handle_always_inline_attribute },
749 { "gnu_inline", 0, 0, true, false, false,
750 handle_gnu_inline_attribute },
751 { "artificial", 0, 0, true, false, false,
752 handle_artificial_attribute },
753 { "flatten", 0, 0, true, false, false,
754 handle_flatten_attribute },
755 { "used", 0, 0, true, false, false,
756 handle_used_attribute },
757 { "unused", 0, 0, false, false, false,
758 handle_unused_attribute },
759 { "externally_visible", 0, 0, true, false, false,
760 handle_externally_visible_attribute },
761 /* The same comments as for noreturn attributes apply to const ones. */
762 { "const", 0, 0, true, false, false,
763 handle_const_attribute },
764 { "transparent_union", 0, 0, false, false, false,
765 handle_transparent_union_attribute },
766 { "constructor", 0, 1, true, false, false,
767 handle_constructor_attribute },
768 { "destructor", 0, 1, true, false, false,
769 handle_destructor_attribute },
770 { "mode", 1, 1, false, true, false,
771 handle_mode_attribute },
772 { "section", 1, 1, true, false, false,
773 handle_section_attribute },
774 { "aligned", 0, 1, false, false, false,
775 handle_aligned_attribute },
776 { "weak", 0, 0, true, false, false,
777 handle_weak_attribute },
778 { "alias", 1, 1, true, false, false,
779 handle_alias_attribute },
780 { "weakref", 0, 1, true, false, false,
781 handle_weakref_attribute },
782 { "no_instrument_function", 0, 0, true, false, false,
783 handle_no_instrument_function_attribute },
784 { "malloc", 0, 0, true, false, false,
785 handle_malloc_attribute },
786 { "returns_twice", 0, 0, true, false, false,
787 handle_returns_twice_attribute },
788 { "no_stack_limit", 0, 0, true, false, false,
789 handle_no_limit_stack_attribute },
790 { "pure", 0, 0, true, false, false,
791 handle_pure_attribute },
792 /* For internal use (marking of builtins) only. The name contains space
793 to prevent its usage in source code. */
794 { "no vops", 0, 0, true, false, false,
795 handle_novops_attribute },
796 { "deprecated", 0, 1, false, false, false,
797 handle_deprecated_attribute },
798 { "vector_size", 1, 1, false, true, false,
799 handle_vector_size_attribute },
800 { "visibility", 1, 1, false, false, false,
801 handle_visibility_attribute },
802 { "tls_model", 1, 1, true, false, false,
803 handle_tls_model_attribute },
804 { "nonnull", 0, -1, false, true, true,
805 handle_nonnull_attribute },
806 { "nothrow", 0, 0, true, false, false,
807 handle_nothrow_attribute },
808 { "may_alias", 0, 0, false, true, false, NULL },
809 { "cleanup", 1, 1, true, false, false,
810 handle_cleanup_attribute },
811 { "warn_unused_result", 0, 0, false, true, true,
812 handle_warn_unused_result_attribute },
813 { "sentinel", 0, 1, false, true, true,
814 handle_sentinel_attribute },
815 /* For internal use (marking of builtins) only. The name contains space
816 to prevent its usage in source code. */
817 { "type generic", 0, 0, false, true, true,
818 handle_type_generic_attribute },
819 { "alloc_size", 1, 2, false, true, true,
820 handle_alloc_size_attribute },
821 { "cold", 0, 0, true, false, false,
822 handle_cold_attribute },
823 { "hot", 0, 0, true, false, false,
824 handle_hot_attribute },
825 { "warning", 1, 1, true, false, false,
826 handle_error_attribute },
827 { "error", 1, 1, true, false, false,
828 handle_error_attribute },
829 { "target", 1, -1, true, false, false,
830 handle_target_attribute },
831 { "optimize", 1, -1, true, false, false,
832 handle_optimize_attribute },
833 /* For internal use (marking of builtins and runtime functions) only.
834 The name contains space to prevent its usage in source code. */
835 { "fn spec", 1, 1, false, true, true,
836 handle_fnspec_attribute },
837 { NULL, 0, 0, false, false, false, NULL }
840 /* Give the specifications for the format attributes, used by C and all
843 const struct attribute_spec c_common_format_attribute_table[] =
845 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
846 { "format", 3, 3, false, true, true,
847 handle_format_attribute },
848 { "format_arg", 1, 1, false, true, true,
849 handle_format_arg_attribute },
850 { NULL, 0, 0, false, false, false, NULL }
853 /* Return identifier for address space AS. */
855 c_addr_space_name (addr_space_t as)
859 for (i = 0; i < num_c_common_reswords; i++)
860 if (c_common_reswords[i].rid == RID_FIRST_ADDR_SPACE + as)
861 return c_common_reswords[i].word;
866 /* Push current bindings for the function name VAR_DECLS. */
869 start_fname_decls (void)
872 tree saved = NULL_TREE;
874 for (ix = 0; fname_vars[ix].decl; ix++)
876 tree decl = *fname_vars[ix].decl;
880 saved = tree_cons (decl, build_int_cst (NULL_TREE, ix), saved);
881 *fname_vars[ix].decl = NULL_TREE;
884 if (saved || saved_function_name_decls)
885 /* Normally they'll have been NULL, so only push if we've got a
886 stack, or they are non-NULL. */
887 saved_function_name_decls = tree_cons (saved, NULL_TREE,
888 saved_function_name_decls);
891 /* Finish up the current bindings, adding them into the current function's
892 statement tree. This must be done _before_ finish_stmt_tree is called.
893 If there is no current function, we must be at file scope and no statements
894 are involved. Pop the previous bindings. */
897 finish_fname_decls (void)
900 tree stmts = NULL_TREE;
901 tree stack = saved_function_name_decls;
903 for (; stack && TREE_VALUE (stack); stack = TREE_CHAIN (stack))
904 append_to_statement_list (TREE_VALUE (stack), &stmts);
908 tree *bodyp = &DECL_SAVED_TREE (current_function_decl);
910 if (TREE_CODE (*bodyp) == BIND_EXPR)
911 bodyp = &BIND_EXPR_BODY (*bodyp);
913 append_to_statement_list_force (*bodyp, &stmts);
917 for (ix = 0; fname_vars[ix].decl; ix++)
918 *fname_vars[ix].decl = NULL_TREE;
922 /* We had saved values, restore them. */
925 for (saved = TREE_PURPOSE (stack); saved; saved = TREE_CHAIN (saved))
927 tree decl = TREE_PURPOSE (saved);
928 unsigned ix = TREE_INT_CST_LOW (TREE_VALUE (saved));
930 *fname_vars[ix].decl = decl;
932 stack = TREE_CHAIN (stack);
934 saved_function_name_decls = stack;
937 /* Return the text name of the current function, suitably prettified
938 by PRETTY_P. Return string must be freed by caller. */
941 fname_as_string (int pretty_p)
943 const char *name = "top level";
946 cpp_string cstr = { 0, 0 }, strname;
954 if (current_function_decl)
955 name = lang_hooks.decl_printable_name (current_function_decl, vrb);
957 len = strlen (name) + 3; /* Two for '"'s. One for NULL. */
959 namep = XNEWVEC (char, len);
960 snprintf (namep, len, "\"%s\"", name);
961 strname.text = (unsigned char *) namep;
962 strname.len = len - 1;
964 if (cpp_interpret_string (parse_in, &strname, 1, &cstr, CPP_STRING))
967 return (const char *) cstr.text;
973 /* Return the VAR_DECL for a const char array naming the current
974 function. If the VAR_DECL has not yet been created, create it
975 now. RID indicates how it should be formatted and IDENTIFIER_NODE
976 ID is its name (unfortunately C and C++ hold the RID values of
977 keywords in different places, so we can't derive RID from ID in
978 this language independent code. LOC is the location of the
982 fname_decl (location_t loc, unsigned int rid, tree id)
985 tree decl = NULL_TREE;
987 for (ix = 0; fname_vars[ix].decl; ix++)
988 if (fname_vars[ix].rid == rid)
991 decl = *fname_vars[ix].decl;
994 /* If a tree is built here, it would normally have the lineno of
995 the current statement. Later this tree will be moved to the
996 beginning of the function and this line number will be wrong.
997 To avoid this problem set the lineno to 0 here; that prevents
998 it from appearing in the RTL. */
1000 location_t saved_location = input_location;
1001 input_location = UNKNOWN_LOCATION;
1003 stmts = push_stmt_list ();
1004 decl = (*make_fname_decl) (loc, id, fname_vars[ix].pretty);
1005 stmts = pop_stmt_list (stmts);
1006 if (!IS_EMPTY_STMT (stmts))
1007 saved_function_name_decls
1008 = tree_cons (decl, stmts, saved_function_name_decls);
1009 *fname_vars[ix].decl = decl;
1010 input_location = saved_location;
1012 if (!ix && !current_function_decl)
1013 pedwarn (loc, 0, "%qD is not defined outside of function scope", decl);
1018 /* Given a STRING_CST, give it a suitable array-of-chars data type. */
1021 fix_string_type (tree value)
1023 int length = TREE_STRING_LENGTH (value);
1025 tree e_type, i_type, a_type;
1027 /* Compute the number of elements, for the array type. */
1028 if (TREE_TYPE (value) == char_array_type_node || !TREE_TYPE (value))
1031 e_type = char_type_node;
1033 else if (TREE_TYPE (value) == char16_array_type_node)
1035 nchars = length / (TYPE_PRECISION (char16_type_node) / BITS_PER_UNIT);
1036 e_type = char16_type_node;
1038 else if (TREE_TYPE (value) == char32_array_type_node)
1040 nchars = length / (TYPE_PRECISION (char32_type_node) / BITS_PER_UNIT);
1041 e_type = char32_type_node;
1045 nchars = length / (TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT);
1046 e_type = wchar_type_node;
1049 /* C89 2.2.4.1, C99 5.2.4.1 (Translation limits). The analogous
1050 limit in C++98 Annex B is very large (65536) and is not normative,
1051 so we do not diagnose it (warn_overlength_strings is forced off
1052 in c_common_post_options). */
1053 if (warn_overlength_strings)
1055 const int nchars_max = flag_isoc99 ? 4095 : 509;
1056 const int relevant_std = flag_isoc99 ? 99 : 90;
1057 if (nchars - 1 > nchars_max)
1058 /* Translators: The %d after 'ISO C' will be 90 or 99. Do not
1059 separate the %d from the 'C'. 'ISO' should not be
1060 translated, but it may be moved after 'C%d' in languages
1061 where modifiers follow nouns. */
1062 pedwarn (input_location, OPT_Woverlength_strings,
1063 "string length %qd is greater than the length %qd "
1064 "ISO C%d compilers are required to support",
1065 nchars - 1, nchars_max, relevant_std);
1068 /* Create the array type for the string constant. The ISO C++
1069 standard says that a string literal has type `const char[N]' or
1070 `const wchar_t[N]'. We use the same logic when invoked as a C
1071 front-end with -Wwrite-strings.
1072 ??? We should change the type of an expression depending on the
1073 state of a warning flag. We should just be warning -- see how
1074 this is handled in the C++ front-end for the deprecated implicit
1075 conversion from string literals to `char*' or `wchar_t*'.
1077 The C++ front end relies on TYPE_MAIN_VARIANT of a cv-qualified
1078 array type being the unqualified version of that type.
1079 Therefore, if we are constructing an array of const char, we must
1080 construct the matching unqualified array type first. The C front
1081 end does not require this, but it does no harm, so we do it
1083 i_type = build_index_type (build_int_cst (NULL_TREE, nchars - 1));
1084 a_type = build_array_type (e_type, i_type);
1085 if (c_dialect_cxx() || warn_write_strings)
1086 a_type = c_build_qualified_type (a_type, TYPE_QUAL_CONST);
1088 TREE_TYPE (value) = a_type;
1089 TREE_CONSTANT (value) = 1;
1090 TREE_READONLY (value) = 1;
1091 TREE_STATIC (value) = 1;
1095 /* Fully fold EXPR, an expression that was not folded (beyond integer
1096 constant expressions and null pointer constants) when being built
1097 up. If IN_INIT, this is in a static initializer and certain
1098 changes are made to the folding done. Clear *MAYBE_CONST if
1099 MAYBE_CONST is not NULL and EXPR is definitely not a constant
1100 expression because it contains an evaluated operator (in C99) or an
1101 operator outside of sizeof returning an integer constant (in C90)
1102 not permitted in constant expressions, or because it contains an
1103 evaluated arithmetic overflow. (*MAYBE_CONST should typically be
1104 set to true by callers before calling this function.) Return the
1105 folded expression. Function arguments have already been folded
1106 before calling this function, as have the contents of SAVE_EXPR,
1107 TARGET_EXPR, BIND_EXPR, VA_ARG_EXPR, OBJ_TYPE_REF and
1108 C_MAYBE_CONST_EXPR. */
1111 c_fully_fold (tree expr, bool in_init, bool *maybe_const)
1114 tree eptype = NULL_TREE;
1116 bool maybe_const_itself = true;
1117 location_t loc = EXPR_LOCATION (expr);
1119 /* This function is not relevant to C++ because C++ folds while
1120 parsing, and may need changes to be correct for C++ when C++
1121 stops folding while parsing. */
1122 if (c_dialect_cxx ())
1126 maybe_const = &dummy;
1127 if (TREE_CODE (expr) == EXCESS_PRECISION_EXPR)
1129 eptype = TREE_TYPE (expr);
1130 expr = TREE_OPERAND (expr, 0);
1132 ret = c_fully_fold_internal (expr, in_init, maybe_const,
1133 &maybe_const_itself);
1135 ret = fold_convert_loc (loc, eptype, ret);
1136 *maybe_const &= maybe_const_itself;
1140 /* Internal helper for c_fully_fold. EXPR and IN_INIT are as for
1141 c_fully_fold. *MAYBE_CONST_OPERANDS is cleared because of operands
1142 not permitted, while *MAYBE_CONST_ITSELF is cleared because of
1143 arithmetic overflow (for C90, *MAYBE_CONST_OPERANDS is carried from
1144 both evaluated and unevaluated subexpressions while
1145 *MAYBE_CONST_ITSELF is carried from only evaluated
1149 c_fully_fold_internal (tree expr, bool in_init, bool *maybe_const_operands,
1150 bool *maybe_const_itself)
1153 enum tree_code code = TREE_CODE (expr);
1154 enum tree_code_class kind = TREE_CODE_CLASS (code);
1155 location_t loc = EXPR_LOCATION (expr);
1156 tree op0, op1, op2, op3;
1157 tree orig_op0, orig_op1, orig_op2;
1158 bool op0_const = true, op1_const = true, op2_const = true;
1159 bool op0_const_self = true, op1_const_self = true, op2_const_self = true;
1160 bool nowarning = TREE_NO_WARNING (expr);
1163 /* This function is not relevant to C++ because C++ folds while
1164 parsing, and may need changes to be correct for C++ when C++
1165 stops folding while parsing. */
1166 if (c_dialect_cxx ())
1169 /* Constants, declarations, statements, errors, SAVE_EXPRs and
1170 anything else not counted as an expression cannot usefully be
1171 folded further at this point. */
1172 if (!IS_EXPR_CODE_CLASS (kind)
1173 || kind == tcc_statement
1174 || code == SAVE_EXPR)
1177 /* Operands of variable-length expressions (function calls) have
1178 already been folded, as have __builtin_* function calls, and such
1179 expressions cannot occur in constant expressions. */
1180 if (kind == tcc_vl_exp)
1182 *maybe_const_operands = false;
1187 if (code == C_MAYBE_CONST_EXPR)
1189 tree pre = C_MAYBE_CONST_EXPR_PRE (expr);
1190 tree inner = C_MAYBE_CONST_EXPR_EXPR (expr);
1191 if (C_MAYBE_CONST_EXPR_NON_CONST (expr))
1192 *maybe_const_operands = false;
1193 if (C_MAYBE_CONST_EXPR_INT_OPERANDS (expr))
1194 *maybe_const_itself = false;
1195 if (pre && !in_init)
1196 ret = build2 (COMPOUND_EXPR, TREE_TYPE (expr), pre, inner);
1202 /* Assignment, increment, decrement, function call and comma
1203 operators, and statement expressions, cannot occur in constant
1204 expressions if evaluated / outside of sizeof. (Function calls
1205 were handled above, though VA_ARG_EXPR is treated like a function
1206 call here, and statement expressions are handled through
1207 C_MAYBE_CONST_EXPR to avoid folding inside them.) */
1211 case PREDECREMENT_EXPR:
1212 case PREINCREMENT_EXPR:
1213 case POSTDECREMENT_EXPR:
1214 case POSTINCREMENT_EXPR:
1216 *maybe_const_operands = false;
1223 *maybe_const_operands = false;
1231 /* Fold individual tree codes as appropriate. */
1234 case COMPOUND_LITERAL_EXPR:
1235 /* Any non-constancy will have been marked in a containing
1236 C_MAYBE_CONST_EXPR; there is no more folding to do here. */
1240 orig_op0 = op0 = TREE_OPERAND (expr, 0);
1241 op1 = TREE_OPERAND (expr, 1);
1242 op2 = TREE_OPERAND (expr, 2);
1243 op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands,
1244 maybe_const_itself);
1245 STRIP_TYPE_NOPS (op0);
1246 if (op0 != orig_op0)
1247 ret = build3 (COMPONENT_REF, TREE_TYPE (expr), op0, op1, op2);
1250 TREE_READONLY (ret) = TREE_READONLY (expr);
1251 TREE_THIS_VOLATILE (ret) = TREE_THIS_VOLATILE (expr);
1256 orig_op0 = op0 = TREE_OPERAND (expr, 0);
1257 orig_op1 = op1 = TREE_OPERAND (expr, 1);
1258 op2 = TREE_OPERAND (expr, 2);
1259 op3 = TREE_OPERAND (expr, 3);
1260 op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands,
1261 maybe_const_itself);
1262 STRIP_TYPE_NOPS (op0);
1263 op1 = c_fully_fold_internal (op1, in_init, maybe_const_operands,
1264 maybe_const_itself);
1265 STRIP_TYPE_NOPS (op1);
1266 op1 = decl_constant_value_for_optimization (op1);
1267 if (op0 != orig_op0 || op1 != orig_op1)
1268 ret = build4 (ARRAY_REF, TREE_TYPE (expr), op0, op1, op2, op3);
1271 TREE_READONLY (ret) = TREE_READONLY (expr);
1272 TREE_SIDE_EFFECTS (ret) = TREE_SIDE_EFFECTS (expr);
1273 TREE_THIS_VOLATILE (ret) = TREE_THIS_VOLATILE (expr);
1280 case PREDECREMENT_EXPR:
1281 case PREINCREMENT_EXPR:
1282 case POSTDECREMENT_EXPR:
1283 case POSTINCREMENT_EXPR:
1287 case POINTER_PLUS_EXPR:
1288 case TRUNC_DIV_EXPR:
1290 case FLOOR_DIV_EXPR:
1291 case TRUNC_MOD_EXPR:
1293 case EXACT_DIV_EXPR:
1306 case TRUTH_AND_EXPR:
1308 case TRUTH_XOR_EXPR:
1309 case UNORDERED_EXPR:
1316 /* Binary operations evaluating both arguments (increment and
1317 decrement are binary internally in GCC). */
1318 orig_op0 = op0 = TREE_OPERAND (expr, 0);
1319 orig_op1 = op1 = TREE_OPERAND (expr, 1);
1320 op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands,
1321 maybe_const_itself);
1322 STRIP_TYPE_NOPS (op0);
1323 if (code != MODIFY_EXPR
1324 && code != PREDECREMENT_EXPR
1325 && code != PREINCREMENT_EXPR
1326 && code != POSTDECREMENT_EXPR
1327 && code != POSTINCREMENT_EXPR)
1328 op0 = decl_constant_value_for_optimization (op0);
1329 /* The RHS of a MODIFY_EXPR was fully folded when building that
1330 expression for the sake of conversion warnings. */
1331 if (code != MODIFY_EXPR)
1332 op1 = c_fully_fold_internal (op1, in_init, maybe_const_operands,
1333 maybe_const_itself);
1334 STRIP_TYPE_NOPS (op1);
1335 op1 = decl_constant_value_for_optimization (op1);
1336 if (op0 != orig_op0 || op1 != orig_op1 || in_init)
1338 ? fold_build2_initializer_loc (loc, code, TREE_TYPE (expr), op0, op1)
1339 : fold_build2_loc (loc, code, TREE_TYPE (expr), op0, op1);
1342 if (TREE_OVERFLOW_P (ret)
1343 && !TREE_OVERFLOW_P (op0)
1344 && !TREE_OVERFLOW_P (op1))
1345 overflow_warning (EXPR_LOCATION (expr), ret);
1349 case FIX_TRUNC_EXPR:
1352 case NON_LVALUE_EXPR:
1355 case TRUTH_NOT_EXPR:
1360 /* Unary operations. */
1361 orig_op0 = op0 = TREE_OPERAND (expr, 0);
1362 op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands,
1363 maybe_const_itself);
1364 STRIP_TYPE_NOPS (op0);
1365 if (code != ADDR_EXPR && code != REALPART_EXPR && code != IMAGPART_EXPR)
1366 op0 = decl_constant_value_for_optimization (op0);
1367 if (op0 != orig_op0 || in_init)
1369 ? fold_build1_initializer_loc (loc, code, TREE_TYPE (expr), op0)
1370 : fold_build1_loc (loc, code, TREE_TYPE (expr), op0);
1373 if (code == INDIRECT_REF
1375 && TREE_CODE (ret) == INDIRECT_REF)
1377 TREE_READONLY (ret) = TREE_READONLY (expr);
1378 TREE_SIDE_EFFECTS (ret) = TREE_SIDE_EFFECTS (expr);
1379 TREE_THIS_VOLATILE (ret) = TREE_THIS_VOLATILE (expr);
1383 case FIX_TRUNC_EXPR:
1386 /* Don't warn about explicit conversions. We will already
1387 have warned about suspect implicit conversions. */
1391 if (TREE_OVERFLOW_P (ret) && !TREE_OVERFLOW_P (op0))
1392 overflow_warning (EXPR_LOCATION (expr), ret);
1397 case TRUTH_ANDIF_EXPR:
1398 case TRUTH_ORIF_EXPR:
1399 /* Binary operations not necessarily evaluating both
1401 orig_op0 = op0 = TREE_OPERAND (expr, 0);
1402 orig_op1 = op1 = TREE_OPERAND (expr, 1);
1403 op0 = c_fully_fold_internal (op0, in_init, &op0_const, &op0_const_self);
1404 STRIP_TYPE_NOPS (op0);
1406 unused_p = (op0 == (code == TRUTH_ANDIF_EXPR
1407 ? truthvalue_false_node
1408 : truthvalue_true_node));
1409 c_inhibit_evaluation_warnings += unused_p;
1410 op1 = c_fully_fold_internal (op1, in_init, &op1_const, &op1_const_self);
1411 STRIP_TYPE_NOPS (op1);
1412 c_inhibit_evaluation_warnings -= unused_p;
1414 if (op0 != orig_op0 || op1 != orig_op1 || in_init)
1416 ? fold_build2_initializer_loc (loc, code, TREE_TYPE (expr), op0, op1)
1417 : fold_build2_loc (loc, code, TREE_TYPE (expr), op0, op1);
1420 *maybe_const_operands &= op0_const;
1421 *maybe_const_itself &= op0_const_self;
1425 && (code == TRUTH_ANDIF_EXPR
1426 ? op0 == truthvalue_false_node
1427 : op0 == truthvalue_true_node)))
1428 *maybe_const_operands &= op1_const;
1431 && (code == TRUTH_ANDIF_EXPR
1432 ? op0 == truthvalue_false_node
1433 : op0 == truthvalue_true_node)))
1434 *maybe_const_itself &= op1_const_self;
1438 orig_op0 = op0 = TREE_OPERAND (expr, 0);
1439 orig_op1 = op1 = TREE_OPERAND (expr, 1);
1440 orig_op2 = op2 = TREE_OPERAND (expr, 2);
1441 op0 = c_fully_fold_internal (op0, in_init, &op0_const, &op0_const_self);
1443 STRIP_TYPE_NOPS (op0);
1444 c_inhibit_evaluation_warnings += (op0 == truthvalue_false_node);
1445 op1 = c_fully_fold_internal (op1, in_init, &op1_const, &op1_const_self);
1446 STRIP_TYPE_NOPS (op1);
1447 c_inhibit_evaluation_warnings -= (op0 == truthvalue_false_node);
1449 c_inhibit_evaluation_warnings += (op0 == truthvalue_true_node);
1450 op2 = c_fully_fold_internal (op2, in_init, &op2_const, &op2_const_self);
1451 STRIP_TYPE_NOPS (op2);
1452 c_inhibit_evaluation_warnings -= (op0 == truthvalue_true_node);
1454 if (op0 != orig_op0 || op1 != orig_op1 || op2 != orig_op2)
1455 ret = fold_build3_loc (loc, code, TREE_TYPE (expr), op0, op1, op2);
1458 *maybe_const_operands &= op0_const;
1459 *maybe_const_itself &= op0_const_self;
1463 && op0 == truthvalue_false_node))
1464 *maybe_const_operands &= op1_const;
1467 && op0 == truthvalue_false_node))
1468 *maybe_const_itself &= op1_const_self;
1472 && op0 == truthvalue_true_node))
1473 *maybe_const_operands &= op2_const;
1476 && op0 == truthvalue_true_node))
1477 *maybe_const_itself &= op2_const_self;
1480 case EXCESS_PRECISION_EXPR:
1481 /* Each case where an operand with excess precision may be
1482 encountered must remove the EXCESS_PRECISION_EXPR around
1483 inner operands and possibly put one around the whole
1484 expression or possibly convert to the semantic type (which
1485 c_fully_fold does); we cannot tell at this stage which is
1486 appropriate in any particular case. */
1490 /* Various codes may appear through folding built-in functions
1491 and their arguments. */
1496 /* Some folding may introduce NON_LVALUE_EXPRs; all lvalue checks
1497 have been done by this point, so remove them again. */
1498 nowarning |= TREE_NO_WARNING (ret);
1499 STRIP_TYPE_NOPS (ret);
1500 if (nowarning && !TREE_NO_WARNING (ret))
1502 if (!CAN_HAVE_LOCATION_P (ret))
1503 ret = build1 (NOP_EXPR, TREE_TYPE (ret), ret);
1504 TREE_NO_WARNING (ret) = 1;
1507 protected_set_expr_location (ret, loc);
1511 /* If not optimizing, EXP is not a VAR_DECL, or EXP has array type,
1512 return EXP. Otherwise, return either EXP or its known constant
1513 value (if it has one), but return EXP if EXP has mode BLKmode. ???
1514 Is the BLKmode test appropriate? */
1517 decl_constant_value_for_optimization (tree exp)
1521 /* This function is only used by C, for c_fully_fold and other
1522 optimization, and may not be correct for C++. */
1523 if (c_dialect_cxx ())
1527 || TREE_CODE (exp) != VAR_DECL
1528 || TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
1529 || DECL_MODE (exp) == BLKmode)
1532 ret = decl_constant_value (exp);
1533 /* Avoid unwanted tree sharing between the initializer and current
1534 function's body where the tree can be modified e.g. by the
1536 if (ret != exp && TREE_STATIC (exp))
1537 ret = unshare_expr (ret);
1541 /* Print a warning if a constant expression had overflow in folding.
1542 Invoke this function on every expression that the language
1543 requires to be a constant expression.
1544 Note the ANSI C standard says it is erroneous for a
1545 constant expression to overflow. */
1548 constant_expression_warning (tree value)
1550 if (warn_overflow && pedantic
1551 && (TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST
1552 || TREE_CODE (value) == FIXED_CST
1553 || TREE_CODE (value) == VECTOR_CST
1554 || TREE_CODE (value) == COMPLEX_CST)
1555 && TREE_OVERFLOW (value))
1556 pedwarn (input_location, OPT_Woverflow, "overflow in constant expression");
1559 /* The same as above but print an unconditional error. */
1561 constant_expression_error (tree value)
1563 if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST
1564 || TREE_CODE (value) == FIXED_CST
1565 || TREE_CODE (value) == VECTOR_CST
1566 || TREE_CODE (value) == COMPLEX_CST)
1567 && TREE_OVERFLOW (value))
1568 error ("overflow in constant expression");
1571 /* Print a warning if an expression had overflow in folding and its
1574 Invoke this function on every expression that
1575 (1) appears in the source code, and
1576 (2) is a constant expression that overflowed, and
1577 (3) is not already checked by convert_and_check;
1578 however, do not invoke this function on operands of explicit casts
1579 or when the expression is the result of an operator and any operand
1580 already overflowed. */
1583 overflow_warning (location_t loc, tree value)
1585 if (c_inhibit_evaluation_warnings != 0)
1588 switch (TREE_CODE (value))
1591 warning_at (loc, OPT_Woverflow, "integer overflow in expression");
1595 warning_at (loc, OPT_Woverflow,
1596 "floating point overflow in expression");
1600 warning_at (loc, OPT_Woverflow, "fixed-point overflow in expression");
1604 warning_at (loc, OPT_Woverflow, "vector overflow in expression");
1608 if (TREE_CODE (TREE_REALPART (value)) == INTEGER_CST)
1609 warning_at (loc, OPT_Woverflow,
1610 "complex integer overflow in expression");
1611 else if (TREE_CODE (TREE_REALPART (value)) == REAL_CST)
1612 warning_at (loc, OPT_Woverflow,
1613 "complex floating point overflow in expression");
1621 /* Warn about uses of logical || / && operator in a context where it
1622 is likely that the bitwise equivalent was intended by the
1623 programmer. We have seen an expression in which CODE is a binary
1624 operator used to combine expressions OP_LEFT and OP_RIGHT, which before folding
1625 had CODE_LEFT and CODE_RIGHT, into an expression of type TYPE. */
1627 warn_logical_operator (location_t location, enum tree_code code, tree type,
1628 enum tree_code code_left, tree op_left,
1629 enum tree_code ARG_UNUSED (code_right), tree op_right)
1631 int or_op = (code == TRUTH_ORIF_EXPR || code == TRUTH_OR_EXPR);
1632 int in0_p, in1_p, in_p;
1633 tree low0, low1, low, high0, high1, high, lhs, rhs, tem;
1634 bool strict_overflow_p = false;
1636 if (code != TRUTH_ANDIF_EXPR
1637 && code != TRUTH_AND_EXPR
1638 && code != TRUTH_ORIF_EXPR
1639 && code != TRUTH_OR_EXPR)
1642 /* Warn if &&/|| are being used in a context where it is
1643 likely that the bitwise equivalent was intended by the
1644 programmer. That is, an expression such as op && MASK
1645 where op should not be any boolean expression, nor a
1646 constant, and mask seems to be a non-boolean integer constant. */
1647 if (!truth_value_p (code_left)
1648 && INTEGRAL_TYPE_P (TREE_TYPE (op_left))
1649 && !CONSTANT_CLASS_P (op_left)
1650 && !TREE_NO_WARNING (op_left)
1651 && TREE_CODE (op_right) == INTEGER_CST
1652 && !integer_zerop (op_right)
1653 && !integer_onep (op_right))
1656 warning_at (location, OPT_Wlogical_op, "logical %<or%>"
1657 " applied to non-boolean constant");
1659 warning_at (location, OPT_Wlogical_op, "logical %<and%>"
1660 " applied to non-boolean constant");
1661 TREE_NO_WARNING (op_left) = true;
1665 /* We do not warn for constants because they are typical of macro
1666 expansions that test for features. */
1667 if (CONSTANT_CLASS_P (op_left) || CONSTANT_CLASS_P (op_right))
1670 /* This warning only makes sense with logical operands. */
1671 if (!(truth_value_p (TREE_CODE (op_left))
1672 || INTEGRAL_TYPE_P (TREE_TYPE (op_left)))
1673 || !(truth_value_p (TREE_CODE (op_right))
1674 || INTEGRAL_TYPE_P (TREE_TYPE (op_right))))
1677 lhs = make_range (op_left, &in0_p, &low0, &high0, &strict_overflow_p);
1678 rhs = make_range (op_right, &in1_p, &low1, &high1, &strict_overflow_p);
1680 if (lhs && TREE_CODE (lhs) == C_MAYBE_CONST_EXPR)
1681 lhs = C_MAYBE_CONST_EXPR_EXPR (lhs);
1683 if (rhs && TREE_CODE (rhs) == C_MAYBE_CONST_EXPR)
1684 rhs = C_MAYBE_CONST_EXPR_EXPR (rhs);
1686 /* If this is an OR operation, invert both sides; we will invert
1687 again at the end. */
1689 in0_p = !in0_p, in1_p = !in1_p;
1691 /* If both expressions are the same, if we can merge the ranges, and we
1692 can build the range test, return it or it inverted. */
1693 if (lhs && rhs && operand_equal_p (lhs, rhs, 0)
1694 && merge_ranges (&in_p, &low, &high, in0_p, low0, high0,
1696 && 0 != (tem = build_range_check (UNKNOWN_LOCATION,
1697 type, lhs, in_p, low, high)))
1699 if (TREE_CODE (tem) != INTEGER_CST)
1703 warning_at (location, OPT_Wlogical_op,
1705 "of collectively exhaustive tests is always true");
1707 warning_at (location, OPT_Wlogical_op,
1709 "of mutually exclusive tests is always false");
1714 /* Print a warning about casts that might indicate violation
1715 of strict aliasing rules if -Wstrict-aliasing is used and
1716 strict aliasing mode is in effect. OTYPE is the original
1717 TREE_TYPE of EXPR, and TYPE the type we're casting to. */
1720 strict_aliasing_warning (tree otype, tree type, tree expr)
1722 /* Strip pointer conversion chains and get to the correct original type. */
1724 otype = TREE_TYPE (expr);
1726 if (!(flag_strict_aliasing
1727 && POINTER_TYPE_P (type)
1728 && POINTER_TYPE_P (otype)
1729 && !VOID_TYPE_P (TREE_TYPE (type)))
1730 /* If the type we are casting to is a ref-all pointer
1731 dereferencing it is always valid. */
1732 || TYPE_REF_CAN_ALIAS_ALL (type))
1735 if ((warn_strict_aliasing > 1) && TREE_CODE (expr) == ADDR_EXPR
1736 && (DECL_P (TREE_OPERAND (expr, 0))
1737 || handled_component_p (TREE_OPERAND (expr, 0))))
1739 /* Casting the address of an object to non void pointer. Warn
1740 if the cast breaks type based aliasing. */
1741 if (!COMPLETE_TYPE_P (TREE_TYPE (type)) && warn_strict_aliasing == 2)
1743 warning (OPT_Wstrict_aliasing, "type-punning to incomplete type "
1744 "might break strict-aliasing rules");
1749 /* warn_strict_aliasing >= 3. This includes the default (3).
1750 Only warn if the cast is dereferenced immediately. */
1751 alias_set_type set1 =
1752 get_alias_set (TREE_TYPE (TREE_OPERAND (expr, 0)));
1753 alias_set_type set2 = get_alias_set (TREE_TYPE (type));
1755 if (set1 != set2 && set2 != 0
1756 && (set1 == 0 || !alias_sets_conflict_p (set1, set2)))
1758 warning (OPT_Wstrict_aliasing, "dereferencing type-punned "
1759 "pointer will break strict-aliasing rules");
1762 else if (warn_strict_aliasing == 2
1763 && !alias_sets_must_conflict_p (set1, set2))
1765 warning (OPT_Wstrict_aliasing, "dereferencing type-punned "
1766 "pointer might break strict-aliasing rules");
1772 if ((warn_strict_aliasing == 1) && !VOID_TYPE_P (TREE_TYPE (otype)))
1774 /* At this level, warn for any conversions, even if an address is
1775 not taken in the same statement. This will likely produce many
1776 false positives, but could be useful to pinpoint problems that
1777 are not revealed at higher levels. */
1778 alias_set_type set1 = get_alias_set (TREE_TYPE (otype));
1779 alias_set_type set2 = get_alias_set (TREE_TYPE (type));
1780 if (!COMPLETE_TYPE_P (type)
1781 || !alias_sets_must_conflict_p (set1, set2))
1783 warning (OPT_Wstrict_aliasing, "dereferencing type-punned "
1784 "pointer might break strict-aliasing rules");
1792 /* Warn for unlikely, improbable, or stupid DECL declarations
1796 check_main_parameter_types (tree decl)
1801 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl)); args;
1802 args = TREE_CHAIN (args))
1804 tree type = args ? TREE_VALUE (args) : 0;
1806 if (type == void_type_node || type == error_mark_node )
1813 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
1814 pedwarn (input_location, OPT_Wmain, "first argument of %q+D should be %<int%>",
1819 if (TREE_CODE (type) != POINTER_TYPE
1820 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
1821 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
1823 pedwarn (input_location, OPT_Wmain, "second argument of %q+D should be %<char **%>",
1828 if (TREE_CODE (type) != POINTER_TYPE
1829 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
1830 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
1832 pedwarn (input_location, OPT_Wmain, "third argument of %q+D should probably be "
1833 "%<char **%>", decl);
1838 /* It is intentional that this message does not mention the third
1839 argument because it's only mentioned in an appendix of the
1841 if (argct > 0 && (argct < 2 || argct > 3))
1842 pedwarn (input_location, OPT_Wmain, "%q+D takes only zero or two arguments", decl);
1845 /* True if pointers to distinct types T1 and T2 can be converted to
1846 each other without an explicit cast. Only returns true for opaque
1849 vector_targets_convertible_p (const_tree t1, const_tree t2)
1851 if (TREE_CODE (t1) == VECTOR_TYPE && TREE_CODE (t2) == VECTOR_TYPE
1852 && (TYPE_VECTOR_OPAQUE (t1) || TYPE_VECTOR_OPAQUE (t2))
1853 && tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2)))
1859 /* True if vector types T1 and T2 can be converted to each other
1860 without an explicit cast. If EMIT_LAX_NOTE is true, and T1 and T2
1861 can only be converted with -flax-vector-conversions yet that is not
1862 in effect, emit a note telling the user about that option if such
1863 a note has not previously been emitted. */
1865 vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note)
1867 static bool emitted_lax_note = false;
1868 bool convertible_lax;
1870 if ((TYPE_VECTOR_OPAQUE (t1) || TYPE_VECTOR_OPAQUE (t2))
1871 && tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2)))
1875 (tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2))
1876 && (TREE_CODE (TREE_TYPE (t1)) != REAL_TYPE ||
1877 TYPE_PRECISION (t1) == TYPE_PRECISION (t2))
1878 && (INTEGRAL_TYPE_P (TREE_TYPE (t1))
1879 == INTEGRAL_TYPE_P (TREE_TYPE (t2))));
1881 if (!convertible_lax || flag_lax_vector_conversions)
1882 return convertible_lax;
1884 if (TYPE_VECTOR_SUBPARTS (t1) == TYPE_VECTOR_SUBPARTS (t2)
1885 && lang_hooks.types_compatible_p (TREE_TYPE (t1), TREE_TYPE (t2)))
1888 if (emit_lax_note && !emitted_lax_note)
1890 emitted_lax_note = true;
1891 inform (input_location, "use -flax-vector-conversions to permit "
1892 "conversions between vectors with differing "
1893 "element types or numbers of subparts");
1899 /* This is a helper function of build_binary_op.
1901 For certain operations if both args were extended from the same
1902 smaller type, do the arithmetic in that type and then extend.
1904 BITWISE indicates a bitwise operation.
1905 For them, this optimization is safe only if
1906 both args are zero-extended or both are sign-extended.
1907 Otherwise, we might change the result.
1908 Eg, (short)-1 | (unsigned short)-1 is (int)-1
1909 but calculated in (unsigned short) it would be (unsigned short)-1.
1911 tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise)
1913 int unsigned0, unsigned1;
1918 /* Cast OP0 and OP1 to RESULT_TYPE. Doing so prevents
1919 excessive narrowing when we call get_narrower below. For
1920 example, suppose that OP0 is of unsigned int extended
1921 from signed char and that RESULT_TYPE is long long int.
1922 If we explicitly cast OP0 to RESULT_TYPE, OP0 would look
1925 (long long int) (unsigned int) signed_char
1927 which get_narrower would narrow down to
1929 (unsigned int) signed char
1931 If we do not cast OP0 first, get_narrower would return
1932 signed_char, which is inconsistent with the case of the
1934 op0 = convert (result_type, op0);
1935 op1 = convert (result_type, op1);
1937 arg0 = get_narrower (op0, &unsigned0);
1938 arg1 = get_narrower (op1, &unsigned1);
1940 /* UNS is 1 if the operation to be done is an unsigned one. */
1941 uns = TYPE_UNSIGNED (result_type);
1943 /* Handle the case that OP0 (or OP1) does not *contain* a conversion
1944 but it *requires* conversion to FINAL_TYPE. */
1946 if ((TYPE_PRECISION (TREE_TYPE (op0))
1947 == TYPE_PRECISION (TREE_TYPE (arg0)))
1948 && TREE_TYPE (op0) != result_type)
1949 unsigned0 = TYPE_UNSIGNED (TREE_TYPE (op0));
1950 if ((TYPE_PRECISION (TREE_TYPE (op1))
1951 == TYPE_PRECISION (TREE_TYPE (arg1)))
1952 && TREE_TYPE (op1) != result_type)
1953 unsigned1 = TYPE_UNSIGNED (TREE_TYPE (op1));
1955 /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */
1957 /* For bitwise operations, signedness of nominal type
1958 does not matter. Consider only how operands were extended. */
1962 /* Note that in all three cases below we refrain from optimizing
1963 an unsigned operation on sign-extended args.
1964 That would not be valid. */
1966 /* Both args variable: if both extended in same way
1967 from same width, do it in that width.
1968 Do it unsigned if args were zero-extended. */
1969 if ((TYPE_PRECISION (TREE_TYPE (arg0))
1970 < TYPE_PRECISION (result_type))
1971 && (TYPE_PRECISION (TREE_TYPE (arg1))
1972 == TYPE_PRECISION (TREE_TYPE (arg0)))
1973 && unsigned0 == unsigned1
1974 && (unsigned0 || !uns))
1975 return c_common_signed_or_unsigned_type
1976 (unsigned0, common_type (TREE_TYPE (arg0), TREE_TYPE (arg1)));
1978 else if (TREE_CODE (arg0) == INTEGER_CST
1979 && (unsigned1 || !uns)
1980 && (TYPE_PRECISION (TREE_TYPE (arg1))
1981 < TYPE_PRECISION (result_type))
1983 = c_common_signed_or_unsigned_type (unsigned1,
1985 && !POINTER_TYPE_P (type)
1986 && int_fits_type_p (arg0, type))
1989 else if (TREE_CODE (arg1) == INTEGER_CST
1990 && (unsigned0 || !uns)
1991 && (TYPE_PRECISION (TREE_TYPE (arg0))
1992 < TYPE_PRECISION (result_type))
1994 = c_common_signed_or_unsigned_type (unsigned0,
1996 && !POINTER_TYPE_P (type)
1997 && int_fits_type_p (arg1, type))
2003 /* Warns if the conversion of EXPR to TYPE may alter a value.
2004 This is a helper function for warnings_for_convert_and_check. */
2007 conversion_warning (tree type, tree expr)
2009 bool give_warning = false;
2012 const int expr_num_operands = TREE_OPERAND_LENGTH (expr);
2013 tree expr_type = TREE_TYPE (expr);
2015 if (!warn_conversion && !warn_sign_conversion)
2018 /* If any operand is artificial, then this expression was generated
2019 by the compiler and we do not warn. */
2020 for (i = 0; i < expr_num_operands; i++)
2022 tree op = TREE_OPERAND (expr, i);
2023 if (op && DECL_P (op) && DECL_ARTIFICIAL (op))
2027 switch (TREE_CODE (expr))
2035 case TRUTH_ANDIF_EXPR:
2036 case TRUTH_ORIF_EXPR:
2037 case TRUTH_AND_EXPR:
2039 case TRUTH_XOR_EXPR:
2040 case TRUTH_NOT_EXPR:
2041 /* Conversion from boolean to a signed:1 bit-field (which only
2042 can hold the values 0 and -1) doesn't lose information - but
2043 it does change the value. */
2044 if (TYPE_PRECISION (type) == 1 && !TYPE_UNSIGNED (type))
2045 warning (OPT_Wconversion,
2046 "conversion to %qT from boolean expression", type);
2052 /* Warn for real constant that is not an exact integer converted
2054 if (TREE_CODE (expr_type) == REAL_TYPE
2055 && TREE_CODE (type) == INTEGER_TYPE)
2057 if (!real_isinteger (TREE_REAL_CST_PTR (expr), TYPE_MODE (expr_type)))
2058 give_warning = true;
2060 /* Warn for an integer constant that does not fit into integer type. */
2061 else if (TREE_CODE (expr_type) == INTEGER_TYPE
2062 && TREE_CODE (type) == INTEGER_TYPE
2063 && !int_fits_type_p (expr, type))
2065 if (TYPE_UNSIGNED (type) && !TYPE_UNSIGNED (expr_type)
2066 && tree_int_cst_sgn (expr) < 0)
2067 warning (OPT_Wsign_conversion,
2068 "negative integer implicitly converted to unsigned type");
2069 else if (!TYPE_UNSIGNED (type) && TYPE_UNSIGNED (expr_type))
2070 warning (OPT_Wsign_conversion, "conversion of unsigned constant "
2071 "value to negative integer");
2073 give_warning = true;
2075 else if (TREE_CODE (type) == REAL_TYPE)
2077 /* Warn for an integer constant that does not fit into real type. */
2078 if (TREE_CODE (expr_type) == INTEGER_TYPE)
2080 REAL_VALUE_TYPE a = real_value_from_int_cst (0, expr);
2081 if (!exact_real_truncate (TYPE_MODE (type), &a))
2082 give_warning = true;
2084 /* Warn for a real constant that does not fit into a smaller
2086 else if (TREE_CODE (expr_type) == REAL_TYPE
2087 && TYPE_PRECISION (type) < TYPE_PRECISION (expr_type))
2089 REAL_VALUE_TYPE a = TREE_REAL_CST (expr);
2090 if (!exact_real_truncate (TYPE_MODE (type), &a))
2091 give_warning = true;
2096 warning (OPT_Wconversion,
2097 "conversion to %qT alters %qT constant value",
2104 /* In case of COND_EXPR, if both operands are constants or
2105 COND_EXPR, then we do not care about the type of COND_EXPR,
2106 only about the conversion of each operand. */
2107 tree op1 = TREE_OPERAND (expr, 1);
2108 tree op2 = TREE_OPERAND (expr, 2);
2110 if ((TREE_CODE (op1) == REAL_CST || TREE_CODE (op1) == INTEGER_CST
2111 || TREE_CODE (op1) == COND_EXPR)
2112 && (TREE_CODE (op2) == REAL_CST || TREE_CODE (op2) == INTEGER_CST
2113 || TREE_CODE (op2) == COND_EXPR))
2115 conversion_warning (type, op1);
2116 conversion_warning (type, op2);
2122 default: /* 'expr' is not a constant. */
2124 /* Warn for real types converted to integer types. */
2125 if (TREE_CODE (expr_type) == REAL_TYPE
2126 && TREE_CODE (type) == INTEGER_TYPE)
2127 give_warning = true;
2129 else if (TREE_CODE (expr_type) == INTEGER_TYPE
2130 && TREE_CODE (type) == INTEGER_TYPE)
2132 /* Don't warn about unsigned char y = 0xff, x = (int) y; */
2133 expr = get_unwidened (expr, 0);
2134 expr_type = TREE_TYPE (expr);
2136 /* Don't warn for short y; short x = ((int)y & 0xff); */
2137 if (TREE_CODE (expr) == BIT_AND_EXPR
2138 || TREE_CODE (expr) == BIT_IOR_EXPR
2139 || TREE_CODE (expr) == BIT_XOR_EXPR)
2141 /* If both args were extended from a shortest type,
2142 use that type if that is safe. */
2143 expr_type = shorten_binary_op (expr_type,
2144 TREE_OPERAND (expr, 0),
2145 TREE_OPERAND (expr, 1),
2148 if (TREE_CODE (expr) == BIT_AND_EXPR)
2150 tree op0 = TREE_OPERAND (expr, 0);
2151 tree op1 = TREE_OPERAND (expr, 1);
2152 bool unsigned0 = TYPE_UNSIGNED (TREE_TYPE (op0));
2153 bool unsigned1 = TYPE_UNSIGNED (TREE_TYPE (op1));
2155 /* If one of the operands is a non-negative constant
2156 that fits in the target type, then the type of the
2157 other operand does not matter. */
2158 if ((TREE_CODE (op0) == INTEGER_CST
2159 && int_fits_type_p (op0, c_common_signed_type (type))
2160 && int_fits_type_p (op0, c_common_unsigned_type (type)))
2161 || (TREE_CODE (op1) == INTEGER_CST
2162 && int_fits_type_p (op1, c_common_signed_type (type))
2163 && int_fits_type_p (op1,
2164 c_common_unsigned_type (type))))
2166 /* If constant is unsigned and fits in the target
2167 type, then the result will also fit. */
2168 else if ((TREE_CODE (op0) == INTEGER_CST
2170 && int_fits_type_p (op0, type))
2171 || (TREE_CODE (op1) == INTEGER_CST
2173 && int_fits_type_p (op1, type)))
2177 /* Warn for integer types converted to smaller integer types. */
2178 if (TYPE_PRECISION (type) < TYPE_PRECISION (expr_type))
2179 give_warning = true;
2181 /* When they are the same width but different signedness,
2182 then the value may change. */
2183 else if ((TYPE_PRECISION (type) == TYPE_PRECISION (expr_type)
2184 && TYPE_UNSIGNED (expr_type) != TYPE_UNSIGNED (type))
2185 /* Even when converted to a bigger type, if the type is
2186 unsigned but expr is signed, then negative values
2188 || (TYPE_UNSIGNED (type) && !TYPE_UNSIGNED (expr_type)))
2189 warning (OPT_Wsign_conversion, "conversion to %qT from %qT "
2190 "may change the sign of the result",
2194 /* Warn for integer types converted to real types if and only if
2195 all the range of values of the integer type cannot be
2196 represented by the real type. */
2197 else if (TREE_CODE (expr_type) == INTEGER_TYPE
2198 && TREE_CODE (type) == REAL_TYPE)
2200 tree type_low_bound, type_high_bound;
2201 REAL_VALUE_TYPE real_low_bound, real_high_bound;
2203 /* Don't warn about char y = 0xff; float x = (int) y; */
2204 expr = get_unwidened (expr, 0);
2205 expr_type = TREE_TYPE (expr);
2207 type_low_bound = TYPE_MIN_VALUE (expr_type);
2208 type_high_bound = TYPE_MAX_VALUE (expr_type);
2209 real_low_bound = real_value_from_int_cst (0, type_low_bound);
2210 real_high_bound = real_value_from_int_cst (0, type_high_bound);
2212 if (!exact_real_truncate (TYPE_MODE (type), &real_low_bound)
2213 || !exact_real_truncate (TYPE_MODE (type), &real_high_bound))
2214 give_warning = true;
2217 /* Warn for real types converted to smaller real types. */
2218 else if (TREE_CODE (expr_type) == REAL_TYPE
2219 && TREE_CODE (type) == REAL_TYPE
2220 && TYPE_PRECISION (type) < TYPE_PRECISION (expr_type))
2221 give_warning = true;
2225 warning (OPT_Wconversion,
2226 "conversion to %qT from %qT may alter its value",
2231 /* Produce warnings after a conversion. RESULT is the result of
2232 converting EXPR to TYPE. This is a helper function for
2233 convert_and_check and cp_convert_and_check. */
2236 warnings_for_convert_and_check (tree type, tree expr, tree result)
2238 if (TREE_CODE (expr) == INTEGER_CST
2239 && (TREE_CODE (type) == INTEGER_TYPE
2240 || TREE_CODE (type) == ENUMERAL_TYPE)
2241 && !int_fits_type_p (expr, type))
2243 /* Do not diagnose overflow in a constant expression merely
2244 because a conversion overflowed. */
2245 if (TREE_OVERFLOW (result))
2246 TREE_OVERFLOW (result) = TREE_OVERFLOW (expr);
2248 if (TYPE_UNSIGNED (type))
2250 /* This detects cases like converting -129 or 256 to
2252 if (!int_fits_type_p (expr, c_common_signed_type (type)))
2253 warning (OPT_Woverflow,
2254 "large integer implicitly truncated to unsigned type");
2256 conversion_warning (type, expr);
2258 else if (!int_fits_type_p (expr, c_common_unsigned_type (type)))
2259 warning (OPT_Woverflow,
2260 "overflow in implicit constant conversion");
2261 /* No warning for converting 0x80000000 to int. */
2263 && (TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE
2264 || TYPE_PRECISION (TREE_TYPE (expr))
2265 != TYPE_PRECISION (type)))
2266 warning (OPT_Woverflow,
2267 "overflow in implicit constant conversion");
2270 conversion_warning (type, expr);
2272 else if ((TREE_CODE (result) == INTEGER_CST
2273 || TREE_CODE (result) == FIXED_CST) && TREE_OVERFLOW (result))
2274 warning (OPT_Woverflow,
2275 "overflow in implicit constant conversion");
2277 conversion_warning (type, expr);
2281 /* Convert EXPR to TYPE, warning about conversion problems with constants.
2282 Invoke this function on every expression that is converted implicitly,
2283 i.e. because of language rules and not because of an explicit cast. */
2286 convert_and_check (tree type, tree expr)
2289 tree expr_for_warning;
2291 /* Convert from a value with possible excess precision rather than
2292 via the semantic type, but do not warn about values not fitting
2293 exactly in the semantic type. */
2294 if (TREE_CODE (expr) == EXCESS_PRECISION_EXPR)
2296 tree orig_type = TREE_TYPE (expr);
2297 expr = TREE_OPERAND (expr, 0);
2298 expr_for_warning = convert (orig_type, expr);
2299 if (orig_type == type)
2300 return expr_for_warning;
2303 expr_for_warning = expr;
2305 if (TREE_TYPE (expr) == type)
2308 result = convert (type, expr);
2310 if (c_inhibit_evaluation_warnings == 0
2311 && !TREE_OVERFLOW_P (expr)
2312 && result != error_mark_node)
2313 warnings_for_convert_and_check (type, expr_for_warning, result);
2318 /* A node in a list that describes references to variables (EXPR), which are
2319 either read accesses if WRITER is zero, or write accesses, in which case
2320 WRITER is the parent of EXPR. */
2327 /* Used to implement a cache the results of a call to verify_tree. We only
2328 use this for SAVE_EXPRs. */
2331 struct tlist_cache *next;
2332 struct tlist *cache_before_sp;
2333 struct tlist *cache_after_sp;
2337 /* Obstack to use when allocating tlist structures, and corresponding
2339 static struct obstack tlist_obstack;
2340 static char *tlist_firstobj = 0;
2342 /* Keep track of the identifiers we've warned about, so we can avoid duplicate
2344 static struct tlist *warned_ids;
2345 /* SAVE_EXPRs need special treatment. We process them only once and then
2346 cache the results. */
2347 static struct tlist_cache *save_expr_cache;
2349 static void add_tlist (struct tlist **, struct tlist *, tree, int);
2350 static void merge_tlist (struct tlist **, struct tlist *, int);
2351 static void verify_tree (tree, struct tlist **, struct tlist **, tree);
2352 static int warning_candidate_p (tree);
2353 static bool candidate_equal_p (const_tree, const_tree);
2354 static void warn_for_collisions (struct tlist *);
2355 static void warn_for_collisions_1 (tree, tree, struct tlist *, int);
2356 static struct tlist *new_tlist (struct tlist *, tree, tree);
2358 /* Create a new struct tlist and fill in its fields. */
2359 static struct tlist *
2360 new_tlist (struct tlist *next, tree t, tree writer)
2363 l = XOBNEW (&tlist_obstack, struct tlist);
2370 /* Add duplicates of the nodes found in ADD to the list *TO. If EXCLUDE_WRITER
2371 is nonnull, we ignore any node we find which has a writer equal to it. */
2374 add_tlist (struct tlist **to, struct tlist *add, tree exclude_writer, int copy)
2378 struct tlist *next = add->next;
2381 if (!exclude_writer || !candidate_equal_p (add->writer, exclude_writer))
2382 *to = copy ? new_tlist (*to, add->expr, add->writer) : add;
2387 /* Merge the nodes of ADD into TO. This merging process is done so that for
2388 each variable that already exists in TO, no new node is added; however if
2389 there is a write access recorded in ADD, and an occurrence on TO is only
2390 a read access, then the occurrence in TO will be modified to record the
2394 merge_tlist (struct tlist **to, struct tlist *add, int copy)
2396 struct tlist **end = to;
2399 end = &(*end)->next;
2405 struct tlist *next = add->next;
2407 for (tmp2 = *to; tmp2; tmp2 = tmp2->next)
2408 if (candidate_equal_p (tmp2->expr, add->expr))
2412 tmp2->writer = add->writer;
2416 *end = copy ? add : new_tlist (NULL, add->expr, add->writer);
2417 end = &(*end)->next;
2424 /* WRITTEN is a variable, WRITER is its parent. Warn if any of the variable
2425 references in list LIST conflict with it, excluding reads if ONLY writers
2429 warn_for_collisions_1 (tree written, tree writer, struct tlist *list,
2434 /* Avoid duplicate warnings. */
2435 for (tmp = warned_ids; tmp; tmp = tmp->next)
2436 if (candidate_equal_p (tmp->expr, written))
2441 if (candidate_equal_p (list->expr, written)
2442 && !candidate_equal_p (list->writer, writer)
2443 && (!only_writes || list->writer))
2445 warned_ids = new_tlist (warned_ids, written, NULL_TREE);
2446 warning_at (EXPR_HAS_LOCATION (writer)
2447 ? EXPR_LOCATION (writer) : input_location,
2448 OPT_Wsequence_point, "operation on %qE may be undefined",
2455 /* Given a list LIST of references to variables, find whether any of these
2456 can cause conflicts due to missing sequence points. */
2459 warn_for_collisions (struct tlist *list)
2463 for (tmp = list; tmp; tmp = tmp->next)
2466 warn_for_collisions_1 (tmp->expr, tmp->writer, list, 0);
2470 /* Return nonzero if X is a tree that can be verified by the sequence point
2473 warning_candidate_p (tree x)
2475 /* !VOID_TYPE_P (TREE_TYPE (x)) is workaround for cp/tree.c
2476 (lvalue_p) crash on TRY/CATCH. */
2477 return !(DECL_P (x) && DECL_ARTIFICIAL (x))
2478 && TREE_TYPE (x) && !VOID_TYPE_P (TREE_TYPE (x)) && lvalue_p (x);
2481 /* Return nonzero if X and Y appear to be the same candidate (or NULL) */
2483 candidate_equal_p (const_tree x, const_tree y)
2485 return (x == y) || (x && y && operand_equal_p (x, y, 0));
2488 /* Walk the tree X, and record accesses to variables. If X is written by the
2489 parent tree, WRITER is the parent.
2490 We store accesses in one of the two lists: PBEFORE_SP, and PNO_SP. If this
2491 expression or its only operand forces a sequence point, then everything up
2492 to the sequence point is stored in PBEFORE_SP. Everything else gets stored
2494 Once we return, we will have emitted warnings if any subexpression before
2495 such a sequence point could be undefined. On a higher level, however, the
2496 sequence point may not be relevant, and we'll merge the two lists.
2498 Example: (b++, a) + b;
2499 The call that processes the COMPOUND_EXPR will store the increment of B
2500 in PBEFORE_SP, and the use of A in PNO_SP. The higher-level call that
2501 processes the PLUS_EXPR will need to merge the two lists so that
2502 eventually, all accesses end up on the same list (and we'll warn about the
2503 unordered subexpressions b++ and b.
2505 A note on merging. If we modify the former example so that our expression
2508 care must be taken not simply to add all three expressions into the final
2509 PNO_SP list. The function merge_tlist takes care of that by merging the
2510 before-SP list of the COMPOUND_EXPR into its after-SP list in a special
2511 way, so that no more than one access to B is recorded. */
2514 verify_tree (tree x, struct tlist **pbefore_sp, struct tlist **pno_sp,
2517 struct tlist *tmp_before, *tmp_nosp, *tmp_list2, *tmp_list3;
2518 enum tree_code code;
2519 enum tree_code_class cl;
2521 /* X may be NULL if it is the operand of an empty statement expression
2527 code = TREE_CODE (x);
2528 cl = TREE_CODE_CLASS (code);
2530 if (warning_candidate_p (x))
2531 *pno_sp = new_tlist (*pno_sp, x, writer);
2539 case TRUTH_ANDIF_EXPR:
2540 case TRUTH_ORIF_EXPR:
2541 tmp_before = tmp_nosp = tmp_list3 = 0;
2542 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE);
2543 warn_for_collisions (tmp_nosp);
2544 merge_tlist (pbefore_sp, tmp_before, 0);
2545 merge_tlist (pbefore_sp, tmp_nosp, 0);
2546 verify_tree (TREE_OPERAND (x, 1), &tmp_list3, pno_sp, NULL_TREE);
2547 merge_tlist (pbefore_sp, tmp_list3, 0);
2551 tmp_before = tmp_list2 = 0;
2552 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_list2, NULL_TREE);
2553 warn_for_collisions (tmp_list2);
2554 merge_tlist (pbefore_sp, tmp_before, 0);
2555 merge_tlist (pbefore_sp, tmp_list2, 1);
2557 tmp_list3 = tmp_nosp = 0;
2558 verify_tree (TREE_OPERAND (x, 1), &tmp_list3, &tmp_nosp, NULL_TREE);
2559 warn_for_collisions (tmp_nosp);
2560 merge_tlist (pbefore_sp, tmp_list3, 0);
2562 tmp_list3 = tmp_list2 = 0;
2563 verify_tree (TREE_OPERAND (x, 2), &tmp_list3, &tmp_list2, NULL_TREE);
2564 warn_for_collisions (tmp_list2);
2565 merge_tlist (pbefore_sp, tmp_list3, 0);
2566 /* Rather than add both tmp_nosp and tmp_list2, we have to merge the
2567 two first, to avoid warning for (a ? b++ : b++). */
2568 merge_tlist (&tmp_nosp, tmp_list2, 0);
2569 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
2572 case PREDECREMENT_EXPR:
2573 case PREINCREMENT_EXPR:
2574 case POSTDECREMENT_EXPR:
2575 case POSTINCREMENT_EXPR:
2576 verify_tree (TREE_OPERAND (x, 0), pno_sp, pno_sp, x);
2580 tmp_before = tmp_nosp = tmp_list3 = 0;
2581 verify_tree (TREE_OPERAND (x, 1), &tmp_before, &tmp_nosp, NULL_TREE);
2582 verify_tree (TREE_OPERAND (x, 0), &tmp_list3, &tmp_list3, x);
2583 /* Expressions inside the LHS are not ordered wrt. the sequence points
2584 in the RHS. Example:
2586 Despite the fact that the modification of "a" is in the before_sp
2587 list (tmp_before), it conflicts with the use of "a" in the LHS.
2588 We can handle this by adding the contents of tmp_list3
2589 to those of tmp_before, and redoing the collision warnings for that
2591 add_tlist (&tmp_before, tmp_list3, x, 1);
2592 warn_for_collisions (tmp_before);
2593 /* Exclude the LHS itself here; we first have to merge it into the
2594 tmp_nosp list. This is done to avoid warning for "a = a"; if we
2595 didn't exclude the LHS, we'd get it twice, once as a read and once
2597 add_tlist (pno_sp, tmp_list3, x, 0);
2598 warn_for_collisions_1 (TREE_OPERAND (x, 0), x, tmp_nosp, 1);
2600 merge_tlist (pbefore_sp, tmp_before, 0);
2601 if (warning_candidate_p (TREE_OPERAND (x, 0)))
2602 merge_tlist (&tmp_nosp, new_tlist (NULL, TREE_OPERAND (x, 0), x), 0);
2603 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 1);
2607 /* We need to warn about conflicts among arguments and conflicts between
2608 args and the function address. Side effects of the function address,
2609 however, are not ordered by the sequence point of the call. */
2611 call_expr_arg_iterator iter;
2613 tmp_before = tmp_nosp = 0;
2614 verify_tree (CALL_EXPR_FN (x), &tmp_before, &tmp_nosp, NULL_TREE);
2615 FOR_EACH_CALL_EXPR_ARG (arg, iter, x)
2617 tmp_list2 = tmp_list3 = 0;
2618 verify_tree (arg, &tmp_list2, &tmp_list3, NULL_TREE);
2619 merge_tlist (&tmp_list3, tmp_list2, 0);
2620 add_tlist (&tmp_before, tmp_list3, NULL_TREE, 0);
2622 add_tlist (&tmp_before, tmp_nosp, NULL_TREE, 0);
2623 warn_for_collisions (tmp_before);
2624 add_tlist (pbefore_sp, tmp_before, NULL_TREE, 0);
2629 /* Scan all the list, e.g. indices of multi dimensional array. */
2632 tmp_before = tmp_nosp = 0;
2633 verify_tree (TREE_VALUE (x), &tmp_before, &tmp_nosp, NULL_TREE);
2634 merge_tlist (&tmp_nosp, tmp_before, 0);
2635 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
2642 struct tlist_cache *t;
2643 for (t = save_expr_cache; t; t = t->next)
2644 if (candidate_equal_p (t->expr, x))
2649 t = XOBNEW (&tlist_obstack, struct tlist_cache);
2650 t->next = save_expr_cache;
2652 save_expr_cache = t;
2654 tmp_before = tmp_nosp = 0;
2655 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE);
2656 warn_for_collisions (tmp_nosp);
2661 struct tlist *t = tmp_nosp;
2663 merge_tlist (&tmp_list3, t, 0);
2665 t->cache_before_sp = tmp_before;
2666 t->cache_after_sp = tmp_list3;
2668 merge_tlist (pbefore_sp, t->cache_before_sp, 1);
2669 add_tlist (pno_sp, t->cache_after_sp, NULL_TREE, 1);
2674 x = TREE_OPERAND (x, 0);
2681 /* For other expressions, simply recurse on their operands.
2682 Manual tail recursion for unary expressions.
2683 Other non-expressions need not be processed. */
2684 if (cl == tcc_unary)
2686 x = TREE_OPERAND (x, 0);
2690 else if (IS_EXPR_CODE_CLASS (cl))
2693 int max = TREE_OPERAND_LENGTH (x);
2694 for (lp = 0; lp < max; lp++)
2696 tmp_before = tmp_nosp = 0;
2697 verify_tree (TREE_OPERAND (x, lp), &tmp_before, &tmp_nosp, 0);
2698 merge_tlist (&tmp_nosp, tmp_before, 0);
2699 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
2706 /* Try to warn for undefined behavior in EXPR due to missing sequence
2710 verify_sequence_points (tree expr)
2712 struct tlist *before_sp = 0, *after_sp = 0;
2715 save_expr_cache = 0;
2716 if (tlist_firstobj == 0)
2718 gcc_obstack_init (&tlist_obstack);
2719 tlist_firstobj = (char *) obstack_alloc (&tlist_obstack, 0);
2722 verify_tree (expr, &before_sp, &after_sp, 0);
2723 warn_for_collisions (after_sp);
2724 obstack_free (&tlist_obstack, tlist_firstobj);
2727 /* Validate the expression after `case' and apply default promotions. */
2730 check_case_value (tree value)
2732 if (value == NULL_TREE)
2735 /* ??? Can we ever get nops here for a valid case value? We
2737 STRIP_TYPE_NOPS (value);
2738 /* In C++, the following is allowed:
2741 switch (...) { case i: ... }
2743 So, we try to reduce the VALUE to a constant that way. */
2744 if (c_dialect_cxx ())
2746 value = decl_constant_value (value);
2747 STRIP_TYPE_NOPS (value);
2748 value = fold (value);
2751 if (TREE_CODE (value) == INTEGER_CST)
2752 /* Promote char or short to int. */
2753 value = perform_integral_promotions (value);
2754 else if (value != error_mark_node)
2756 error ("case label does not reduce to an integer constant");
2757 value = error_mark_node;
2760 constant_expression_warning (value);
2765 /* See if the case values LOW and HIGH are in the range of the original
2766 type (i.e. before the default conversion to int) of the switch testing
2768 TYPE is the promoted type of the testing expression, and ORIG_TYPE is
2769 the type before promoting it. CASE_LOW_P is a pointer to the lower
2770 bound of the case label, and CASE_HIGH_P is the upper bound or NULL
2771 if the case is not a case range.
2772 The caller has to make sure that we are not called with NULL for
2773 CASE_LOW_P (i.e. the default case).
2774 Returns true if the case label is in range of ORIG_TYPE (saturated or
2775 untouched) or false if the label is out of range. */
2778 check_case_bounds (tree type, tree orig_type,
2779 tree *case_low_p, tree *case_high_p)
2781 tree min_value, max_value;
2782 tree case_low = *case_low_p;
2783 tree case_high = case_high_p ? *case_high_p : case_low;
2785 /* If there was a problem with the original type, do nothing. */
2786 if (orig_type == error_mark_node)
2789 min_value = TYPE_MIN_VALUE (orig_type);
2790 max_value = TYPE_MAX_VALUE (orig_type);
2792 /* Case label is less than minimum for type. */
2793 if (tree_int_cst_compare (case_low, min_value) < 0
2794 && tree_int_cst_compare (case_high, min_value) < 0)
2796 warning (0, "case label value is less than minimum value for type");
2800 /* Case value is greater than maximum for type. */
2801 if (tree_int_cst_compare (case_low, max_value) > 0
2802 && tree_int_cst_compare (case_high, max_value) > 0)
2804 warning (0, "case label value exceeds maximum value for type");
2808 /* Saturate lower case label value to minimum. */
2809 if (tree_int_cst_compare (case_high, min_value) >= 0
2810 && tree_int_cst_compare (case_low, min_value) < 0)
2812 warning (0, "lower value in case label range"
2813 " less than minimum value for type");
2814 case_low = min_value;
2817 /* Saturate upper case label value to maximum. */
2818 if (tree_int_cst_compare (case_low, max_value) <= 0
2819 && tree_int_cst_compare (case_high, max_value) > 0)
2821 warning (0, "upper value in case label range"
2822 " exceeds maximum value for type");
2823 case_high = max_value;
2826 if (*case_low_p != case_low)
2827 *case_low_p = convert (type, case_low);
2828 if (case_high_p && *case_high_p != case_high)
2829 *case_high_p = convert (type, case_high);
2834 /* Return an integer type with BITS bits of precision,
2835 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
2838 c_common_type_for_size (unsigned int bits, int unsignedp)
2840 if (bits == TYPE_PRECISION (integer_type_node))
2841 return unsignedp ? unsigned_type_node : integer_type_node;
2843 if (bits == TYPE_PRECISION (signed_char_type_node))
2844 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
2846 if (bits == TYPE_PRECISION (short_integer_type_node))
2847 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
2849 if (bits == TYPE_PRECISION (long_integer_type_node))
2850 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
2852 if (bits == TYPE_PRECISION (long_long_integer_type_node))
2853 return (unsignedp ? long_long_unsigned_type_node
2854 : long_long_integer_type_node);
2856 if (bits == TYPE_PRECISION (widest_integer_literal_type_node))
2857 return (unsignedp ? widest_unsigned_literal_type_node
2858 : widest_integer_literal_type_node);
2860 if (bits <= TYPE_PRECISION (intQI_type_node))
2861 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
2863 if (bits <= TYPE_PRECISION (intHI_type_node))
2864 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
2866 if (bits <= TYPE_PRECISION (intSI_type_node))
2867 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
2869 if (bits <= TYPE_PRECISION (intDI_type_node))
2870 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
2875 /* Return a fixed-point type that has at least IBIT ibits and FBIT fbits
2876 that is unsigned if UNSIGNEDP is nonzero, otherwise signed;
2877 and saturating if SATP is nonzero, otherwise not saturating. */
2880 c_common_fixed_point_type_for_size (unsigned int ibit, unsigned int fbit,
2881 int unsignedp, int satp)
2883 enum machine_mode mode;
2885 mode = unsignedp ? UQQmode : QQmode;
2887 mode = unsignedp ? UHAmode : HAmode;
2889 for (; mode != VOIDmode; mode = GET_MODE_WIDER_MODE (mode))
2890 if (GET_MODE_IBIT (mode) >= ibit && GET_MODE_FBIT (mode) >= fbit)
2893 if (mode == VOIDmode || !targetm.scalar_mode_supported_p (mode))
2895 sorry ("GCC cannot support operators with integer types and "
2896 "fixed-point types that have too many integral and "
2897 "fractional bits together");
2901 return c_common_type_for_mode (mode, satp);
2904 /* Used for communication between c_common_type_for_mode and
2905 c_register_builtin_type. */
2906 static GTY(()) tree registered_builtin_types;
2908 /* Return a data type that has machine mode MODE.
2909 If the mode is an integer,
2910 then UNSIGNEDP selects between signed and unsigned types.
2911 If the mode is a fixed-point mode,
2912 then UNSIGNEDP selects between saturating and nonsaturating types. */
2915 c_common_type_for_mode (enum machine_mode mode, int unsignedp)
2919 if (mode == TYPE_MODE (integer_type_node))
2920 return unsignedp ? unsigned_type_node : integer_type_node;
2922 if (mode == TYPE_MODE (signed_char_type_node))
2923 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
2925 if (mode == TYPE_MODE (short_integer_type_node))
2926 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
2928 if (mode == TYPE_MODE (long_integer_type_node))
2929 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
2931 if (mode == TYPE_MODE (long_long_integer_type_node))
2932 return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node;
2934 if (mode == TYPE_MODE (widest_integer_literal_type_node))
2935 return unsignedp ? widest_unsigned_literal_type_node
2936 : widest_integer_literal_type_node;
2939 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
2942 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
2945 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
2948 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
2950 #if HOST_BITS_PER_WIDE_INT >= 64
2951 if (mode == TYPE_MODE (intTI_type_node))
2952 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
2955 if (mode == TYPE_MODE (float_type_node))
2956 return float_type_node;
2958 if (mode == TYPE_MODE (double_type_node))
2959 return double_type_node;
2961 if (mode == TYPE_MODE (long_double_type_node))
2962 return long_double_type_node;
2964 if (mode == TYPE_MODE (void_type_node))
2965 return void_type_node;
2967 if (mode == TYPE_MODE (build_pointer_type (char_type_node)))
2969 ? make_unsigned_type (GET_MODE_PRECISION (mode))
2970 : make_signed_type (GET_MODE_PRECISION (mode)));
2972 if (mode == TYPE_MODE (build_pointer_type (integer_type_node)))
2974 ? make_unsigned_type (GET_MODE_PRECISION (mode))
2975 : make_signed_type (GET_MODE_PRECISION (mode)));
2977 if (COMPLEX_MODE_P (mode))
2979 enum machine_mode inner_mode;
2982 if (mode == TYPE_MODE (complex_float_type_node))
2983 return complex_float_type_node;
2984 if (mode == TYPE_MODE (complex_double_type_node))
2985 return complex_double_type_node;
2986 if (mode == TYPE_MODE (complex_long_double_type_node))
2987 return complex_long_double_type_node;
2989 if (mode == TYPE_MODE (complex_integer_type_node) && !unsignedp)
2990 return complex_integer_type_node;
2992 inner_mode = GET_MODE_INNER (mode);
2993 inner_type = c_common_type_for_mode (inner_mode, unsignedp);
2994 if (inner_type != NULL_TREE)
2995 return build_complex_type (inner_type);
2997 else if (VECTOR_MODE_P (mode))
2999 enum machine_mode inner_mode = GET_MODE_INNER (mode);
3000 tree inner_type = c_common_type_for_mode (inner_mode, unsignedp);
3001 if (inner_type != NULL_TREE)
3002 return build_vector_type_for_mode (inner_type, mode);
3005 if (mode == TYPE_MODE (dfloat32_type_node))
3006 return dfloat32_type_node;
3007 if (mode == TYPE_MODE (dfloat64_type_node))
3008 return dfloat64_type_node;
3009 if (mode == TYPE_MODE (dfloat128_type_node))
3010 return dfloat128_type_node;
3012 if (ALL_SCALAR_FIXED_POINT_MODE_P (mode))
3014 if (mode == TYPE_MODE (short_fract_type_node))
3015 return unsignedp ? sat_short_fract_type_node : short_fract_type_node;
3016 if (mode == TYPE_MODE (fract_type_node))
3017 return unsignedp ? sat_fract_type_node : fract_type_node;
3018 if (mode == TYPE_MODE (long_fract_type_node))
3019 return unsignedp ? sat_long_fract_type_node : long_fract_type_node;
3020 if (mode == TYPE_MODE (long_long_fract_type_node))
3021 return unsignedp ? sat_long_long_fract_type_node
3022 : long_long_fract_type_node;
3024 if (mode == TYPE_MODE (unsigned_short_fract_type_node))
3025 return unsignedp ? sat_unsigned_short_fract_type_node
3026 : unsigned_short_fract_type_node;
3027 if (mode == TYPE_MODE (unsigned_fract_type_node))
3028 return unsignedp ? sat_unsigned_fract_type_node
3029 : unsigned_fract_type_node;
3030 if (mode == TYPE_MODE (unsigned_long_fract_type_node))
3031 return unsignedp ? sat_unsigned_long_fract_type_node
3032 : unsigned_long_fract_type_node;
3033 if (mode == TYPE_MODE (unsigned_long_long_fract_type_node))
3034 return unsignedp ? sat_unsigned_long_long_fract_type_node
3035 : unsigned_long_long_fract_type_node;
3037 if (mode == TYPE_MODE (short_accum_type_node))
3038 return unsignedp ? sat_short_accum_type_node : short_accum_type_node;
3039 if (mode == TYPE_MODE (accum_type_node))
3040 return unsignedp ? sat_accum_type_node : accum_type_node;
3041 if (mode == TYPE_MODE (long_accum_type_node))
3042 return unsignedp ? sat_long_accum_type_node : long_accum_type_node;
3043 if (mode == TYPE_MODE (long_long_accum_type_node))
3044 return unsignedp ? sat_long_long_accum_type_node
3045 : long_long_accum_type_node;
3047 if (mode == TYPE_MODE (unsigned_short_accum_type_node))
3048 return unsignedp ? sat_unsigned_short_accum_type_node
3049 : unsigned_short_accum_type_node;
3050 if (mode == TYPE_MODE (unsigned_accum_type_node))
3051 return unsignedp ? sat_unsigned_accum_type_node
3052 : unsigned_accum_type_node;
3053 if (mode == TYPE_MODE (unsigned_long_accum_type_node))
3054 return unsignedp ? sat_unsigned_long_accum_type_node
3055 : unsigned_long_accum_type_node;
3056 if (mode == TYPE_MODE (unsigned_long_long_accum_type_node))
3057 return unsignedp ? sat_unsigned_long_long_accum_type_node
3058 : unsigned_long_long_accum_type_node;
3061 return unsignedp ? sat_qq_type_node : qq_type_node;
3063 return unsignedp ? sat_hq_type_node : hq_type_node;
3065 return unsignedp ? sat_sq_type_node : sq_type_node;
3067 return unsignedp ? sat_dq_type_node : dq_type_node;
3069 return unsignedp ? sat_tq_type_node : tq_type_node;
3071 if (mode == UQQmode)
3072 return unsignedp ? sat_uqq_type_node : uqq_type_node;
3073 if (mode == UHQmode)
3074 return unsignedp ? sat_uhq_type_node : uhq_type_node;
3075 if (mode == USQmode)
3076 return unsignedp ? sat_usq_type_node : usq_type_node;
3077 if (mode == UDQmode)
3078 return unsignedp ? sat_udq_type_node : udq_type_node;
3079 if (mode == UTQmode)
3080 return unsignedp ? sat_utq_type_node : utq_type_node;
3083 return unsignedp ? sat_ha_type_node : ha_type_node;
3085 return unsignedp ? sat_sa_type_node : sa_type_node;
3087 return unsignedp ? sat_da_type_node : da_type_node;
3089 return unsignedp ? sat_ta_type_node : ta_type_node;
3091 if (mode == UHAmode)
3092 return unsignedp ? sat_uha_type_node : uha_type_node;
3093 if (mode == USAmode)
3094 return unsignedp ? sat_usa_type_node : usa_type_node;
3095 if (mode == UDAmode)
3096 return unsignedp ? sat_uda_type_node : uda_type_node;
3097 if (mode == UTAmode)
3098 return unsignedp ? sat_uta_type_node : uta_type_node;
3101 for (t = registered_builtin_types; t; t = TREE_CHAIN (t))
3102 if (TYPE_MODE (TREE_VALUE (t)) == mode)
3103 return TREE_VALUE (t);
3109 c_common_unsigned_type (tree type)
3111 return c_common_signed_or_unsigned_type (1, type);
3114 /* Return a signed type the same as TYPE in other respects. */
3117 c_common_signed_type (tree type)
3119 return c_common_signed_or_unsigned_type (0, type);
3122 /* Return a type the same as TYPE except unsigned or
3123 signed according to UNSIGNEDP. */
3126 c_common_signed_or_unsigned_type (int unsignedp, tree type)
3130 /* This block of code emulates the behavior of the old
3131 c_common_unsigned_type. In particular, it returns
3132 long_unsigned_type_node if passed a long, even when a int would
3133 have the same size. This is necessary for warnings to work
3134 correctly in archs where sizeof(int) == sizeof(long) */
3136 type1 = TYPE_MAIN_VARIANT (type);
3137 if (type1 == signed_char_type_node || type1 == char_type_node || type1 == unsigned_char_type_node)
3138 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3139 if (type1 == integer_type_node || type1 == unsigned_type_node)
3140 return unsignedp ? unsigned_type_node : integer_type_node;
3141 if (type1 == short_integer_type_node || type1 == short_unsigned_type_node)
3142 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3143 if (type1 == long_integer_type_node || type1 == long_unsigned_type_node)
3144 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3145 if (type1 == long_long_integer_type_node || type1 == long_long_unsigned_type_node)
3146 return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node;
3147 if (type1 == widest_integer_literal_type_node || type1 == widest_unsigned_literal_type_node)
3148 return unsignedp ? widest_unsigned_literal_type_node : widest_integer_literal_type_node;
3149 #if HOST_BITS_PER_WIDE_INT >= 64
3150 if (type1 == intTI_type_node || type1 == unsigned_intTI_type_node)
3151 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
3153 if (type1 == intDI_type_node || type1 == unsigned_intDI_type_node)
3154 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
3155 if (type1 == intSI_type_node || type1 == unsigned_intSI_type_node)
3156 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
3157 if (type1 == intHI_type_node || type1 == unsigned_intHI_type_node)
3158 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
3159 if (type1 == intQI_type_node || type1 == unsigned_intQI_type_node)
3160 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
3162 #define C_COMMON_FIXED_TYPES(NAME) \
3163 if (type1 == short_ ## NAME ## _type_node \
3164 || type1 == unsigned_short_ ## NAME ## _type_node) \
3165 return unsignedp ? unsigned_short_ ## NAME ## _type_node \
3166 : short_ ## NAME ## _type_node; \
3167 if (type1 == NAME ## _type_node \
3168 || type1 == unsigned_ ## NAME ## _type_node) \
3169 return unsignedp ? unsigned_ ## NAME ## _type_node \
3170 : NAME ## _type_node; \
3171 if (type1 == long_ ## NAME ## _type_node \
3172 || type1 == unsigned_long_ ## NAME ## _type_node) \
3173 return unsignedp ? unsigned_long_ ## NAME ## _type_node \
3174 : long_ ## NAME ## _type_node; \
3175 if (type1 == long_long_ ## NAME ## _type_node \
3176 || type1 == unsigned_long_long_ ## NAME ## _type_node) \
3177 return unsignedp ? unsigned_long_long_ ## NAME ## _type_node \
3178 : long_long_ ## NAME ## _type_node;
3180 #define C_COMMON_FIXED_MODE_TYPES(NAME) \
3181 if (type1 == NAME ## _type_node \
3182 || type1 == u ## NAME ## _type_node) \
3183 return unsignedp ? u ## NAME ## _type_node \
3184 : NAME ## _type_node;
3186 #define C_COMMON_FIXED_TYPES_SAT(NAME) \
3187 if (type1 == sat_ ## short_ ## NAME ## _type_node \
3188 || type1 == sat_ ## unsigned_short_ ## NAME ## _type_node) \
3189 return unsignedp ? sat_ ## unsigned_short_ ## NAME ## _type_node \
3190 : sat_ ## short_ ## NAME ## _type_node; \
3191 if (type1 == sat_ ## NAME ## _type_node \
3192 || type1 == sat_ ## unsigned_ ## NAME ## _type_node) \
3193 return unsignedp ? sat_ ## unsigned_ ## NAME ## _type_node \
3194 : sat_ ## NAME ## _type_node; \
3195 if (type1 == sat_ ## long_ ## NAME ## _type_node \
3196 || type1 == sat_ ## unsigned_long_ ## NAME ## _type_node) \
3197 return unsignedp ? sat_ ## unsigned_long_ ## NAME ## _type_node \
3198 : sat_ ## long_ ## NAME ## _type_node; \
3199 if (type1 == sat_ ## long_long_ ## NAME ## _type_node \
3200 || type1 == sat_ ## unsigned_long_long_ ## NAME ## _type_node) \
3201 return unsignedp ? sat_ ## unsigned_long_long_ ## NAME ## _type_node \
3202 : sat_ ## long_long_ ## NAME ## _type_node;
3204 #define C_COMMON_FIXED_MODE_TYPES_SAT(NAME) \
3205 if (type1 == sat_ ## NAME ## _type_node \
3206 || type1 == sat_ ## u ## NAME ## _type_node) \
3207 return unsignedp ? sat_ ## u ## NAME ## _type_node \
3208 : sat_ ## NAME ## _type_node;
3210 C_COMMON_FIXED_TYPES (fract);
3211 C_COMMON_FIXED_TYPES_SAT (fract);
3212 C_COMMON_FIXED_TYPES (accum);
3213 C_COMMON_FIXED_TYPES_SAT (accum);
3215 C_COMMON_FIXED_MODE_TYPES (qq);
3216 C_COMMON_FIXED_MODE_TYPES (hq);
3217 C_COMMON_FIXED_MODE_TYPES (sq);
3218 C_COMMON_FIXED_MODE_TYPES (dq);
3219 C_COMMON_FIXED_MODE_TYPES (tq);
3220 C_COMMON_FIXED_MODE_TYPES_SAT (qq);
3221 C_COMMON_FIXED_MODE_TYPES_SAT (hq);
3222 C_COMMON_FIXED_MODE_TYPES_SAT (sq);
3223 C_COMMON_FIXED_MODE_TYPES_SAT (dq);
3224 C_COMMON_FIXED_MODE_TYPES_SAT (tq);
3225 C_COMMON_FIXED_MODE_TYPES (ha);
3226 C_COMMON_FIXED_MODE_TYPES (sa);
3227 C_COMMON_FIXED_MODE_TYPES (da);
3228 C_COMMON_FIXED_MODE_TYPES (ta);
3229 C_COMMON_FIXED_MODE_TYPES_SAT (ha);
3230 C_COMMON_FIXED_MODE_TYPES_SAT (sa);
3231 C_COMMON_FIXED_MODE_TYPES_SAT (da);
3232 C_COMMON_FIXED_MODE_TYPES_SAT (ta);
3234 /* For ENUMERAL_TYPEs in C++, must check the mode of the types, not
3235 the precision; they have precision set to match their range, but
3236 may use a wider mode to match an ABI. If we change modes, we may
3237 wind up with bad conversions. For INTEGER_TYPEs in C, must check
3238 the precision as well, so as to yield correct results for
3239 bit-field types. C++ does not have these separate bit-field
3240 types, and producing a signed or unsigned variant of an
3241 ENUMERAL_TYPE may cause other problems as well. */
3243 if (!INTEGRAL_TYPE_P (type)
3244 || TYPE_UNSIGNED (type) == unsignedp)
3247 #define TYPE_OK(node) \
3248 (TYPE_MODE (type) == TYPE_MODE (node) \
3249 && TYPE_PRECISION (type) == TYPE_PRECISION (node))
3250 if (TYPE_OK (signed_char_type_node))
3251 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3252 if (TYPE_OK (integer_type_node))
3253 return unsignedp ? unsigned_type_node : integer_type_node;
3254 if (TYPE_OK (short_integer_type_node))
3255 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3256 if (TYPE_OK (long_integer_type_node))
3257 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3258 if (TYPE_OK (long_long_integer_type_node))
3259 return (unsignedp ? long_long_unsigned_type_node
3260 : long_long_integer_type_node);
3261 if (TYPE_OK (widest_integer_literal_type_node))
3262 return (unsignedp ? widest_unsigned_literal_type_node
3263 : widest_integer_literal_type_node);
3265 #if HOST_BITS_PER_WIDE_INT >= 64
3266 if (TYPE_OK (intTI_type_node))
3267 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
3269 if (TYPE_OK (intDI_type_node))
3270 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
3271 if (TYPE_OK (intSI_type_node))
3272 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
3273 if (TYPE_OK (intHI_type_node))
3274 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
3275 if (TYPE_OK (intQI_type_node))
3276 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
3279 return build_nonstandard_integer_type (TYPE_PRECISION (type), unsignedp);
3282 /* Build a bit-field integer type for the given WIDTH and UNSIGNEDP. */
3285 c_build_bitfield_integer_type (unsigned HOST_WIDE_INT width, int unsignedp)
3287 /* Extended integer types of the same width as a standard type have
3288 lesser rank, so those of the same width as int promote to int or
3289 unsigned int and are valid for printf formats expecting int or
3290 unsigned int. To avoid such special cases, avoid creating
3291 extended integer types for bit-fields if a standard integer type
3293 if (width == TYPE_PRECISION (integer_type_node))
3294 return unsignedp ? unsigned_type_node : integer_type_node;
3295 if (width == TYPE_PRECISION (signed_char_type_node))
3296 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3297 if (width == TYPE_PRECISION (short_integer_type_node))
3298 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3299 if (width == TYPE_PRECISION (long_integer_type_node))
3300 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3301 if (width == TYPE_PRECISION (long_long_integer_type_node))
3302 return (unsignedp ? long_long_unsigned_type_node
3303 : long_long_integer_type_node);
3304 return build_nonstandard_integer_type (width, unsignedp);
3307 /* The C version of the register_builtin_type langhook. */
3310 c_register_builtin_type (tree type, const char* name)
3314 decl = build_decl (UNKNOWN_LOCATION,
3315 TYPE_DECL, get_identifier (name), type);
3316 DECL_ARTIFICIAL (decl) = 1;
3317 if (!TYPE_NAME (type))
3318 TYPE_NAME (type) = decl;
3321 registered_builtin_types = tree_cons (0, type, registered_builtin_types);
3324 /* Print an error message for invalid operands to arith operation
3325 CODE with TYPE0 for operand 0, and TYPE1 for operand 1.
3326 LOCATION is the location of the message. */
3329 binary_op_error (location_t location, enum tree_code code,
3330 tree type0, tree type1)
3337 opname = "+"; break;
3339 opname = "-"; break;
3341 opname = "*"; break;
3343 opname = "max"; break;
3345 opname = "min"; break;
3347 opname = "=="; break;
3349 opname = "!="; break;
3351 opname = "<="; break;
3353 opname = ">="; break;
3355 opname = "<"; break;
3357 opname = ">"; break;
3359 opname = "<<"; break;
3361 opname = ">>"; break;
3362 case TRUNC_MOD_EXPR:
3363 case FLOOR_MOD_EXPR:
3364 opname = "%"; break;
3365 case TRUNC_DIV_EXPR:
3366 case FLOOR_DIV_EXPR:
3367 opname = "/"; break;
3369 opname = "&"; break;
3371 opname = "|"; break;
3372 case TRUTH_ANDIF_EXPR:
3373 opname = "&&"; break;
3374 case TRUTH_ORIF_EXPR:
3375 opname = "||"; break;
3377 opname = "^"; break;
3382 "invalid operands to binary %s (have %qT and %qT)", opname,
3386 /* Subroutine of build_binary_op, used for comparison operations.
3387 See if the operands have both been converted from subword integer types
3388 and, if so, perhaps change them both back to their original type.
3389 This function is also responsible for converting the two operands
3390 to the proper common type for comparison.
3392 The arguments of this function are all pointers to local variables
3393 of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1,
3394 RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE.
3396 If this function returns nonzero, it means that the comparison has
3397 a constant value. What this function returns is an expression for
3401 shorten_compare (tree *op0_ptr, tree *op1_ptr, tree *restype_ptr,
3402 enum tree_code *rescode_ptr)
3405 tree op0 = *op0_ptr;
3406 tree op1 = *op1_ptr;
3407 int unsignedp0, unsignedp1;
3409 tree primop0, primop1;
3410 enum tree_code code = *rescode_ptr;
3412 /* Throw away any conversions to wider types
3413 already present in the operands. */
3415 primop0 = get_narrower (op0, &unsignedp0);
3416 primop1 = get_narrower (op1, &unsignedp1);
3418 /* Handle the case that OP0 does not *contain* a conversion
3419 but it *requires* conversion to FINAL_TYPE. */
3421 if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr)
3422 unsignedp0 = TYPE_UNSIGNED (TREE_TYPE (op0));
3423 if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr)
3424 unsignedp1 = TYPE_UNSIGNED (TREE_TYPE (op1));
3426 /* If one of the operands must be floated, we cannot optimize. */
3427 real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE;
3428 real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE;
3430 /* If first arg is constant, swap the args (changing operation
3431 so value is preserved), for canonicalization. Don't do this if
3432 the second arg is 0. */
3434 if (TREE_CONSTANT (primop0)
3435 && !integer_zerop (primop1) && !real_zerop (primop1)
3436 && !fixed_zerop (primop1))
3439 int temi = unsignedp0;
3447 unsignedp0 = unsignedp1;
3470 *rescode_ptr = code;
3473 /* If comparing an integer against a constant more bits wide,
3474 maybe we can deduce a value of 1 or 0 independent of the data.
3475 Or else truncate the constant now
3476 rather than extend the variable at run time.
3478 This is only interesting if the constant is the wider arg.
3479 Also, it is not safe if the constant is unsigned and the
3480 variable arg is signed, since in this case the variable
3481 would be sign-extended and then regarded as unsigned.
3482 Our technique fails in this case because the lowest/highest
3483 possible unsigned results don't follow naturally from the
3484 lowest/highest possible values of the variable operand.
3485 For just EQ_EXPR and NE_EXPR there is another technique that
3486 could be used: see if the constant can be faithfully represented
3487 in the other operand's type, by truncating it and reextending it
3488 and see if that preserves the constant's value. */
3490 if (!real1 && !real2
3491 && TREE_CODE (TREE_TYPE (primop0)) != FIXED_POINT_TYPE
3492 && TREE_CODE (primop1) == INTEGER_CST
3493 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr))
3495 int min_gt, max_gt, min_lt, max_lt;
3496 tree maxval, minval;
3497 /* 1 if comparison is nominally unsigned. */
3498 int unsignedp = TYPE_UNSIGNED (*restype_ptr);
3501 type = c_common_signed_or_unsigned_type (unsignedp0,
3502 TREE_TYPE (primop0));
3504 maxval = TYPE_MAX_VALUE (type);
3505 minval = TYPE_MIN_VALUE (type);
3507 if (unsignedp && !unsignedp0)
3508 *restype_ptr = c_common_signed_type (*restype_ptr);
3510 if (TREE_TYPE (primop1) != *restype_ptr)
3512 /* Convert primop1 to target type, but do not introduce
3513 additional overflow. We know primop1 is an int_cst. */
3514 primop1 = force_fit_type_double (*restype_ptr,
3515 TREE_INT_CST_LOW (primop1),
3516 TREE_INT_CST_HIGH (primop1), 0,
3517 TREE_OVERFLOW (primop1));
3519 if (type != *restype_ptr)
3521 minval = convert (*restype_ptr, minval);
3522 maxval = convert (*restype_ptr, maxval);
3525 if (unsignedp && unsignedp0)
3527 min_gt = INT_CST_LT_UNSIGNED (primop1, minval);
3528 max_gt = INT_CST_LT_UNSIGNED (primop1, maxval);
3529 min_lt = INT_CST_LT_UNSIGNED (minval, primop1);
3530 max_lt = INT_CST_LT_UNSIGNED (maxval, primop1);
3534 min_gt = INT_CST_LT (primop1, minval);
3535 max_gt = INT_CST_LT (primop1, maxval);
3536 min_lt = INT_CST_LT (minval, primop1);
3537 max_lt = INT_CST_LT (maxval, primop1);
3541 /* This used to be a switch, but Genix compiler can't handle that. */
3542 if (code == NE_EXPR)
3544 if (max_lt || min_gt)
3545 val = truthvalue_true_node;
3547 else if (code == EQ_EXPR)
3549 if (max_lt || min_gt)
3550 val = truthvalue_false_node;
3552 else if (code == LT_EXPR)
3555 val = truthvalue_true_node;
3557 val = truthvalue_false_node;
3559 else if (code == GT_EXPR)
3562 val = truthvalue_true_node;
3564 val = truthvalue_false_node;
3566 else if (code == LE_EXPR)
3569 val = truthvalue_true_node;
3571 val = truthvalue_false_node;
3573 else if (code == GE_EXPR)
3576 val = truthvalue_true_node;
3578 val = truthvalue_false_node;
3581 /* If primop0 was sign-extended and unsigned comparison specd,
3582 we did a signed comparison above using the signed type bounds.
3583 But the comparison we output must be unsigned.
3585 Also, for inequalities, VAL is no good; but if the signed
3586 comparison had *any* fixed result, it follows that the
3587 unsigned comparison just tests the sign in reverse
3588 (positive values are LE, negative ones GE).
3589 So we can generate an unsigned comparison
3590 against an extreme value of the signed type. */
3592 if (unsignedp && !unsignedp0)
3599 primop1 = TYPE_MIN_VALUE (type);
3605 primop1 = TYPE_MAX_VALUE (type);
3612 type = c_common_unsigned_type (type);
3615 if (TREE_CODE (primop0) != INTEGER_CST)
3617 if (val == truthvalue_false_node)
3618 warning (OPT_Wtype_limits, "comparison is always false due to limited range of data type");
3619 if (val == truthvalue_true_node)
3620 warning (OPT_Wtype_limits, "comparison is always true due to limited range of data type");
3625 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
3626 if (TREE_SIDE_EFFECTS (primop0))
3627 return build2 (COMPOUND_EXPR, TREE_TYPE (val), primop0, val);
3631 /* Value is not predetermined, but do the comparison
3632 in the type of the operand that is not constant.
3633 TYPE is already properly set. */
3636 /* If either arg is decimal float and the other is float, find the
3637 proper common type to use for comparison. */
3638 else if (real1 && real2
3639 && (DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (primop0)))
3640 || DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (primop1)))))
3641 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1));
3643 else if (real1 && real2
3644 && (TYPE_PRECISION (TREE_TYPE (primop0))
3645 == TYPE_PRECISION (TREE_TYPE (primop1))))
3646 type = TREE_TYPE (primop0);
3648 /* If args' natural types are both narrower than nominal type
3649 and both extend in the same manner, compare them
3650 in the type of the wider arg.
3651 Otherwise must actually extend both to the nominal
3652 common type lest different ways of extending
3654 (eg, (short)-1 == (unsigned short)-1 should be 0.) */
3656 else if (unsignedp0 == unsignedp1 && real1 == real2
3657 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)
3658 && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr))
3660 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1));
3661 type = c_common_signed_or_unsigned_type (unsignedp0
3662 || TYPE_UNSIGNED (*restype_ptr),
3664 /* Make sure shorter operand is extended the right way
3665 to match the longer operand. */
3667 = convert (c_common_signed_or_unsigned_type (unsignedp0,
3668 TREE_TYPE (primop0)),
3671 = convert (c_common_signed_or_unsigned_type (unsignedp1,
3672 TREE_TYPE (primop1)),
3677 /* Here we must do the comparison on the nominal type
3678 using the args exactly as we received them. */
3679 type = *restype_ptr;
3683 if (!real1 && !real2 && integer_zerop (primop1)
3684 && TYPE_UNSIGNED (*restype_ptr))
3690 /* All unsigned values are >= 0, so we warn. However,
3691 if OP0 is a constant that is >= 0, the signedness of
3692 the comparison isn't an issue, so suppress the
3694 if (warn_type_limits && !in_system_header
3695 && !(TREE_CODE (primop0) == INTEGER_CST
3696 && !TREE_OVERFLOW (convert (c_common_signed_type (type),
3698 warning (OPT_Wtype_limits,
3699 "comparison of unsigned expression >= 0 is always true");
3700 value = truthvalue_true_node;
3704 if (warn_type_limits && !in_system_header
3705 && !(TREE_CODE (primop0) == INTEGER_CST
3706 && !TREE_OVERFLOW (convert (c_common_signed_type (type),
3708 warning (OPT_Wtype_limits,
3709 "comparison of unsigned expression < 0 is always false");
3710 value = truthvalue_false_node;
3719 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
3720 if (TREE_SIDE_EFFECTS (primop0))
3721 return build2 (COMPOUND_EXPR, TREE_TYPE (value),
3728 *op0_ptr = convert (type, primop0);
3729 *op1_ptr = convert (type, primop1);
3731 *restype_ptr = truthvalue_type_node;
3736 /* Return a tree for the sum or difference (RESULTCODE says which)
3737 of pointer PTROP and integer INTOP. */
3740 pointer_int_sum (location_t loc, enum tree_code resultcode,
3741 tree ptrop, tree intop)
3745 /* The result is a pointer of the same type that is being added. */
3746 tree result_type = TREE_TYPE (ptrop);
3748 if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE)
3750 pedwarn (loc, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
3751 "pointer of type %<void *%> used in arithmetic");
3752 size_exp = integer_one_node;
3754 else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE)
3756 pedwarn (loc, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
3757 "pointer to a function used in arithmetic");
3758 size_exp = integer_one_node;
3760 else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE)
3762 pedwarn (loc, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
3763 "pointer to member function used in arithmetic");
3764 size_exp = integer_one_node;
3767 size_exp = size_in_bytes (TREE_TYPE (result_type));
3769 /* We are manipulating pointer values, so we don't need to warn
3770 about relying on undefined signed overflow. We disable the
3771 warning here because we use integer types so fold won't know that
3772 they are really pointers. */
3773 fold_defer_overflow_warnings ();
3775 /* If what we are about to multiply by the size of the elements
3776 contains a constant term, apply distributive law
3777 and multiply that constant term separately.
3778 This helps produce common subexpressions. */
3779 if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR)
3780 && !TREE_CONSTANT (intop)
3781 && TREE_CONSTANT (TREE_OPERAND (intop, 1))
3782 && TREE_CONSTANT (size_exp)
3783 /* If the constant comes from pointer subtraction,
3784 skip this optimization--it would cause an error. */
3785 && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE
3786 /* If the constant is unsigned, and smaller than the pointer size,
3787 then we must skip this optimization. This is because it could cause
3788 an overflow error if the constant is negative but INTOP is not. */
3789 && (!TYPE_UNSIGNED (TREE_TYPE (intop))
3790 || (TYPE_PRECISION (TREE_TYPE (intop))
3791 == TYPE_PRECISION (TREE_TYPE (ptrop)))))
3793 enum tree_code subcode = resultcode;
3794 tree int_type = TREE_TYPE (intop);
3795 if (TREE_CODE (intop) == MINUS_EXPR)
3796 subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR);
3797 /* Convert both subexpression types to the type of intop,
3798 because weird cases involving pointer arithmetic
3799 can result in a sum or difference with different type args. */
3800 ptrop = build_binary_op (EXPR_LOCATION (TREE_OPERAND (intop, 1)),
3802 convert (int_type, TREE_OPERAND (intop, 1)), 1);
3803 intop = convert (int_type, TREE_OPERAND (intop, 0));
3806 /* Convert the integer argument to a type the same size as sizetype
3807 so the multiply won't overflow spuriously. */
3808 if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype)
3809 || TYPE_UNSIGNED (TREE_TYPE (intop)) != TYPE_UNSIGNED (sizetype))
3810 intop = convert (c_common_type_for_size (TYPE_PRECISION (sizetype),
3811 TYPE_UNSIGNED (sizetype)), intop);
3813 /* Replace the integer argument with a suitable product by the object size.
3814 Do this multiplication as signed, then convert to the appropriate type
3815 for the pointer operation and disregard an overflow that occured only
3816 because of the sign-extension change in the latter conversion. */
3818 tree t = build_binary_op (loc,
3820 convert (TREE_TYPE (intop), size_exp), 1);
3821 intop = convert (sizetype, t);
3822 if (TREE_OVERFLOW_P (intop) && !TREE_OVERFLOW (t))
3823 intop = build_int_cst_wide (TREE_TYPE (intop), TREE_INT_CST_LOW (intop),
3824 TREE_INT_CST_HIGH (intop));
3827 /* Create the sum or difference. */
3828 if (resultcode == MINUS_EXPR)
3829 intop = fold_build1_loc (loc, NEGATE_EXPR, sizetype, intop);
3831 ret = fold_build2_loc (loc, POINTER_PLUS_EXPR, result_type, ptrop, intop);
3833 fold_undefer_and_ignore_overflow_warnings ();
3838 /* Wrap a C_MAYBE_CONST_EXPR around an expression that is fully folded
3839 and if NON_CONST is known not to be permitted in an evaluated part
3840 of a constant expression. */
3843 c_wrap_maybe_const (tree expr, bool non_const)
3845 bool nowarning = TREE_NO_WARNING (expr);
3846 location_t loc = EXPR_LOCATION (expr);
3848 /* This should never be called for C++. */
3849 if (c_dialect_cxx ())
3852 /* The result of folding may have a NOP_EXPR to set TREE_NO_WARNING. */
3853 STRIP_TYPE_NOPS (expr);
3854 expr = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (expr), NULL, expr);
3855 C_MAYBE_CONST_EXPR_NON_CONST (expr) = non_const;
3857 TREE_NO_WARNING (expr) = 1;
3858 protected_set_expr_location (expr, loc);
3863 /* Wrap a SAVE_EXPR around EXPR, if appropriate. Like save_expr, but
3864 for C folds the inside expression and wraps a C_MAYBE_CONST_EXPR
3865 around the SAVE_EXPR if needed so that c_fully_fold does not need
3866 to look inside SAVE_EXPRs. */
3869 c_save_expr (tree expr)
3871 bool maybe_const = true;
3872 if (c_dialect_cxx ())
3873 return save_expr (expr);
3874 expr = c_fully_fold (expr, false, &maybe_const);
3875 expr = save_expr (expr);
3877 expr = c_wrap_maybe_const (expr, true);
3881 /* Return whether EXPR is a declaration whose address can never be
3885 decl_with_nonnull_addr_p (const_tree expr)
3887 return (DECL_P (expr)
3888 && (TREE_CODE (expr) == PARM_DECL
3889 || TREE_CODE (expr) == LABEL_DECL
3890 || !DECL_WEAK (expr)));
3893 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
3894 or for an `if' or `while' statement or ?..: exp. It should already
3895 have been validated to be of suitable type; otherwise, a bad
3896 diagnostic may result.
3898 The EXPR is located at LOCATION.
3900 This preparation consists of taking the ordinary
3901 representation of an expression expr and producing a valid tree
3902 boolean expression describing whether expr is nonzero. We could
3903 simply always do build_binary_op (NE_EXPR, expr, truthvalue_false_node, 1),
3904 but we optimize comparisons, &&, ||, and !.
3906 The resulting type should always be `truthvalue_type_node'. */
3909 c_common_truthvalue_conversion (location_t location, tree expr)
3911 switch (TREE_CODE (expr))
3913 case EQ_EXPR: case NE_EXPR: case UNEQ_EXPR: case LTGT_EXPR:
3914 case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR:
3915 case UNLE_EXPR: case UNGE_EXPR: case UNLT_EXPR: case UNGT_EXPR:
3916 case ORDERED_EXPR: case UNORDERED_EXPR:
3917 if (TREE_TYPE (expr) == truthvalue_type_node)
3919 expr = build2 (TREE_CODE (expr), truthvalue_type_node,
3920 TREE_OPERAND (expr, 0), TREE_OPERAND (expr, 1));
3923 case TRUTH_ANDIF_EXPR:
3924 case TRUTH_ORIF_EXPR:
3925 case TRUTH_AND_EXPR:
3927 case TRUTH_XOR_EXPR:
3928 if (TREE_TYPE (expr) == truthvalue_type_node)
3930 expr = build2 (TREE_CODE (expr), truthvalue_type_node,
3931 c_common_truthvalue_conversion (location,
3932 TREE_OPERAND (expr, 0)),
3933 c_common_truthvalue_conversion (location,
3934 TREE_OPERAND (expr, 1)));
3937 case TRUTH_NOT_EXPR:
3938 if (TREE_TYPE (expr) == truthvalue_type_node)
3940 expr = build1 (TREE_CODE (expr), truthvalue_type_node,
3941 c_common_truthvalue_conversion (location,
3942 TREE_OPERAND (expr, 0)));
3949 return integer_zerop (expr) ? truthvalue_false_node
3950 : truthvalue_true_node;
3953 return real_compare (NE_EXPR, &TREE_REAL_CST (expr), &dconst0)
3954 ? truthvalue_true_node
3955 : truthvalue_false_node;
3958 return fixed_compare (NE_EXPR, &TREE_FIXED_CST (expr),
3959 &FCONST0 (TYPE_MODE (TREE_TYPE (expr))))
3960 ? truthvalue_true_node
3961 : truthvalue_false_node;
3964 expr = build_unary_op (location, ADDR_EXPR, expr, 0);
3969 tree inner = TREE_OPERAND (expr, 0);
3970 if (decl_with_nonnull_addr_p (inner))
3972 /* Common Ada/Pascal programmer's mistake. */
3973 warning_at (location,
3975 "the address of %qD will always evaluate as %<true%>",
3977 return truthvalue_true_node;
3980 /* If we still have a decl, it is possible for its address to
3981 be NULL, so we cannot optimize. */
3984 gcc_assert (DECL_WEAK (inner));
3988 if (TREE_SIDE_EFFECTS (inner))
3990 expr = build2 (COMPOUND_EXPR, truthvalue_type_node,
3991 inner, truthvalue_true_node);
3995 return truthvalue_true_node;
3999 expr = build_binary_op (EXPR_LOCATION (expr),
4000 (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))
4001 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
4002 c_common_truthvalue_conversion (location,
4003 TREE_OPERAND (expr, 0)),
4004 c_common_truthvalue_conversion (location,
4005 TREE_OPERAND (expr, 1)),
4012 case EXCESS_PRECISION_EXPR:
4013 /* These don't change whether an object is nonzero or zero. */
4014 return c_common_truthvalue_conversion (location, TREE_OPERAND (expr, 0));
4018 /* These don't change whether an object is zero or nonzero, but
4019 we can't ignore them if their second arg has side-effects. */
4020 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)))
4022 expr = build2 (COMPOUND_EXPR, truthvalue_type_node,
4023 TREE_OPERAND (expr, 1),
4024 c_common_truthvalue_conversion
4025 (location, TREE_OPERAND (expr, 0)));
4029 return c_common_truthvalue_conversion (location,
4030 TREE_OPERAND (expr, 0));
4033 /* Distribute the conversion into the arms of a COND_EXPR. */
4034 if (c_dialect_cxx ())
4036 expr = fold_build3_loc (location, COND_EXPR, truthvalue_type_node,
4037 TREE_OPERAND (expr, 0),
4038 c_common_truthvalue_conversion (location,
4041 c_common_truthvalue_conversion (location,
4048 /* Folding will happen later for C. */
4049 expr = build3 (COND_EXPR, truthvalue_type_node,
4050 TREE_OPERAND (expr, 0),
4051 c_common_truthvalue_conversion (location,
4052 TREE_OPERAND (expr, 1)),
4053 c_common_truthvalue_conversion (location,
4054 TREE_OPERAND (expr, 2)));
4059 /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE,
4060 since that affects how `default_conversion' will behave. */
4061 if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE
4062 || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE)
4064 /* If this is widening the argument, we can ignore it. */
4065 if (TYPE_PRECISION (TREE_TYPE (expr))
4066 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0))))
4067 return c_common_truthvalue_conversion (location,
4068 TREE_OPERAND (expr, 0));
4072 if (!TREE_NO_WARNING (expr)
4073 && warn_parentheses)
4075 warning (OPT_Wparentheses,
4076 "suggest parentheses around assignment used as truth value");
4077 TREE_NO_WARNING (expr) = 1;
4085 if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE)
4087 tree t = c_save_expr (expr);
4088 expr = (build_binary_op
4089 (EXPR_LOCATION (expr),
4090 (TREE_SIDE_EFFECTS (expr)
4091 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
4092 c_common_truthvalue_conversion
4094 build_unary_op (location, REALPART_EXPR, t, 0)),
4095 c_common_truthvalue_conversion
4097 build_unary_op (location, IMAGPART_EXPR, t, 0)),
4102 if (TREE_CODE (TREE_TYPE (expr)) == FIXED_POINT_TYPE)
4104 tree fixed_zero_node = build_fixed (TREE_TYPE (expr),
4106 (TREE_TYPE (expr))));
4107 return build_binary_op (location, NE_EXPR, expr, fixed_zero_node, 1);
4110 return build_binary_op (location, NE_EXPR, expr, integer_zero_node, 1);
4113 protected_set_expr_location (expr, location);
4117 static void def_builtin_1 (enum built_in_function fncode,
4119 enum built_in_class fnclass,
4120 tree fntype, tree libtype,
4121 bool both_p, bool fallback_p, bool nonansi_p,
4122 tree fnattrs, bool implicit_p);
4125 /* Apply the TYPE_QUALS to the new DECL. */
4128 c_apply_type_quals_to_decl (int type_quals, tree decl)
4130 tree type = TREE_TYPE (decl);
4132 if (type == error_mark_node)
4135 if (((type_quals & TYPE_QUAL_CONST)
4136 || (type && TREE_CODE (type) == REFERENCE_TYPE))
4137 /* An object declared 'const' is only readonly after it is
4138 initialized. We don't have any way of expressing this currently,
4139 so we need to be conservative and unset TREE_READONLY for types
4140 with constructors. Otherwise aliasing code will ignore stores in
4141 an inline constructor. */
4142 && !(type && TYPE_NEEDS_CONSTRUCTING (type)))
4143 TREE_READONLY (decl) = 1;
4144 if (type_quals & TYPE_QUAL_VOLATILE)
4146 TREE_SIDE_EFFECTS (decl) = 1;
4147 TREE_THIS_VOLATILE (decl) = 1;
4149 if (type_quals & TYPE_QUAL_RESTRICT)
4151 while (type && TREE_CODE (type) == ARRAY_TYPE)
4152 /* Allow 'restrict' on arrays of pointers.
4153 FIXME currently we just ignore it. */
4154 type = TREE_TYPE (type);
4156 || !POINTER_TYPE_P (type)
4157 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type)))
4158 error ("invalid use of %<restrict%>");
4162 /* Hash function for the problem of multiple type definitions in
4163 different files. This must hash all types that will compare
4164 equal via comptypes to the same value. In practice it hashes
4165 on some of the simple stuff and leaves the details to comptypes. */
4168 c_type_hash (const void *p)
4172 const_tree const t = (const_tree) p;
4174 switch (TREE_CODE (t))
4176 /* For pointers, hash on pointee type plus some swizzling. */
4178 return c_type_hash (TREE_TYPE (t)) ^ 0x3003003;
4179 /* Hash on number of elements and total size. */
4182 t2 = TYPE_VALUES (t);
4186 t2 = TYPE_FIELDS (t);
4188 case QUAL_UNION_TYPE:
4190 t2 = TYPE_FIELDS (t);
4194 t2 = TYPE_FIELDS (t);
4199 for (; t2; t2 = TREE_CHAIN (t2))
4201 /* We might have a VLA here. */
4202 if (TREE_CODE (TYPE_SIZE (t)) != INTEGER_CST)
4205 size = TREE_INT_CST_LOW (TYPE_SIZE (t));
4206 return ((size << 24) | (i << shift));
4209 static GTY((param_is (union tree_node))) htab_t type_hash_table;
4211 /* Return the typed-based alias set for T, which may be an expression
4212 or a type. Return -1 if we don't do anything special. */
4215 c_common_get_alias_set (tree t)
4220 /* For VLAs, use the alias set of the element type rather than the
4221 default of alias set 0 for types compared structurally. */
4222 if (TYPE_P (t) && TYPE_STRUCTURAL_EQUALITY_P (t))
4224 if (TREE_CODE (t) == ARRAY_TYPE)
4225 return get_alias_set (TREE_TYPE (t));
4229 /* Permit type-punning when accessing a union, provided the access
4230 is directly through the union. For example, this code does not
4231 permit taking the address of a union member and then storing
4232 through it. Even the type-punning allowed here is a GCC
4233 extension, albeit a common and useful one; the C standard says
4234 that such accesses have implementation-defined behavior. */
4236 TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF;
4237 u = TREE_OPERAND (u, 0))
4238 if (TREE_CODE (u) == COMPONENT_REF
4239 && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE)
4242 /* That's all the expressions we handle specially. */
4246 /* The C standard guarantees that any object may be accessed via an
4247 lvalue that has character type. */
4248 if (t == char_type_node
4249 || t == signed_char_type_node
4250 || t == unsigned_char_type_node)
4253 /* The C standard specifically allows aliasing between signed and
4254 unsigned variants of the same type. We treat the signed
4255 variant as canonical. */
4256 if (TREE_CODE (t) == INTEGER_TYPE && TYPE_UNSIGNED (t))
4258 tree t1 = c_common_signed_type (t);
4260 /* t1 == t can happen for boolean nodes which are always unsigned. */
4262 return get_alias_set (t1);
4264 else if (POINTER_TYPE_P (t))
4268 /* Unfortunately, there is no canonical form of a pointer type.
4269 In particular, if we have `typedef int I', then `int *', and
4270 `I *' are different types. So, we have to pick a canonical
4271 representative. We do this below.
4273 Technically, this approach is actually more conservative that
4274 it needs to be. In particular, `const int *' and `int *'
4275 should be in different alias sets, according to the C and C++
4276 standard, since their types are not the same, and so,
4277 technically, an `int **' and `const int **' cannot point at
4280 But, the standard is wrong. In particular, this code is
4285 const int* const* cipp = ipp;
4287 And, it doesn't make sense for that to be legal unless you
4288 can dereference IPP and CIPP. So, we ignore cv-qualifiers on
4289 the pointed-to types. This issue has been reported to the
4291 t1 = build_type_no_quals (t);
4293 return get_alias_set (t1);
4296 /* Handle the case of multiple type nodes referring to "the same" type,
4297 which occurs with IMA. These share an alias set. FIXME: Currently only
4298 C90 is handled. (In C99 type compatibility is not transitive, which
4299 complicates things mightily. The alias set splay trees can theoretically
4300 represent this, but insertion is tricky when you consider all the
4301 different orders things might arrive in.) */
4303 if (c_language != clk_c || flag_isoc99)
4306 /* Save time if there's only one input file. */
4307 if (num_in_fnames == 1)
4310 /* Pointers need special handling if they point to any type that
4311 needs special handling (below). */
4312 if (TREE_CODE (t) == POINTER_TYPE)
4315 /* Find bottom type under any nested POINTERs. */
4316 for (t2 = TREE_TYPE (t);
4317 TREE_CODE (t2) == POINTER_TYPE;
4318 t2 = TREE_TYPE (t2))
4320 if (TREE_CODE (t2) != RECORD_TYPE
4321 && TREE_CODE (t2) != ENUMERAL_TYPE
4322 && TREE_CODE (t2) != QUAL_UNION_TYPE
4323 && TREE_CODE (t2) != UNION_TYPE)
4325 if (TYPE_SIZE (t2) == 0)
4328 /* These are the only cases that need special handling. */
4329 if (TREE_CODE (t) != RECORD_TYPE
4330 && TREE_CODE (t) != ENUMERAL_TYPE
4331 && TREE_CODE (t) != QUAL_UNION_TYPE
4332 && TREE_CODE (t) != UNION_TYPE
4333 && TREE_CODE (t) != POINTER_TYPE)
4336 if (TYPE_SIZE (t) == 0)
4339 /* Look up t in hash table. Only one of the compatible types within each
4340 alias set is recorded in the table. */
4341 if (!type_hash_table)
4342 type_hash_table = htab_create_ggc (1021, c_type_hash,
4343 (htab_eq) lang_hooks.types_compatible_p,
4345 slot = htab_find_slot (type_hash_table, t, INSERT);
4348 TYPE_ALIAS_SET (t) = TYPE_ALIAS_SET ((tree)*slot);
4349 return TYPE_ALIAS_SET ((tree)*slot);
4352 /* Our caller will assign and record (in t) a new alias set; all we need
4353 to do is remember t in the hash table. */
4359 /* Compute the value of 'sizeof (TYPE)' or '__alignof__ (TYPE)', where
4360 the second parameter indicates which OPERATOR is being applied.
4361 The COMPLAIN flag controls whether we should diagnose possibly
4362 ill-formed constructs or not. LOC is the location of the SIZEOF or
4366 c_sizeof_or_alignof_type (location_t loc,
4367 tree type, bool is_sizeof, int complain)
4369 const char *op_name;
4371 enum tree_code type_code = TREE_CODE (type);
4373 op_name = is_sizeof ? "sizeof" : "__alignof__";
4375 if (type_code == FUNCTION_TYPE)
4379 if (complain && (pedantic || warn_pointer_arith))
4380 pedwarn (loc, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
4381 "invalid application of %<sizeof%> to a function type");
4383 return error_mark_node;
4384 value = size_one_node;
4387 value = size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT);
4389 else if (type_code == VOID_TYPE || type_code == ERROR_MARK)
4391 if (type_code == VOID_TYPE
4392 && complain && (pedantic || warn_pointer_arith))
4393 pedwarn (loc, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
4394 "invalid application of %qs to a void type", op_name);
4396 return error_mark_node;
4397 value = size_one_node;
4399 else if (!COMPLETE_TYPE_P (type))
4402 error_at (loc, "invalid application of %qs to incomplete type %qT ",
4404 return error_mark_node;
4409 /* Convert in case a char is more than one unit. */
4410 value = size_binop_loc (loc, CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type),
4411 size_int (TYPE_PRECISION (char_type_node)
4414 value = size_int (TYPE_ALIGN_UNIT (type));
4417 /* VALUE will have an integer type with TYPE_IS_SIZETYPE set.
4418 TYPE_IS_SIZETYPE means that certain things (like overflow) will
4419 never happen. However, this node should really have type
4420 `size_t', which is just a typedef for an ordinary integer type. */
4421 value = fold_convert_loc (loc, size_type_node, value);
4422 gcc_assert (!TYPE_IS_SIZETYPE (TREE_TYPE (value)));
4427 /* Implement the __alignof keyword: Return the minimum required
4428 alignment of EXPR, measured in bytes. For VAR_DECLs,
4429 FUNCTION_DECLs and FIELD_DECLs return DECL_ALIGN (which can be set
4430 from an "aligned" __attribute__ specification). LOC is the
4431 location of the ALIGNOF operator. */
4434 c_alignof_expr (location_t loc, tree expr)
4438 if (VAR_OR_FUNCTION_DECL_P (expr))
4439 t = size_int (DECL_ALIGN_UNIT (expr));
4441 else if (TREE_CODE (expr) == COMPONENT_REF
4442 && DECL_C_BIT_FIELD (TREE_OPERAND (expr, 1)))
4444 error_at (loc, "%<__alignof%> applied to a bit-field");
4447 else if (TREE_CODE (expr) == COMPONENT_REF
4448 && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL)
4449 t = size_int (DECL_ALIGN_UNIT (TREE_OPERAND (expr, 1)));
4451 else if (TREE_CODE (expr) == INDIRECT_REF)
4453 tree t = TREE_OPERAND (expr, 0);
4455 int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
4457 while (CONVERT_EXPR_P (t)
4458 && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE)
4462 t = TREE_OPERAND (t, 0);
4463 thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
4464 if (thisalign > bestalign)
4465 best = t, bestalign = thisalign;
4467 return c_alignof (loc, TREE_TYPE (TREE_TYPE (best)));
4470 return c_alignof (loc, TREE_TYPE (expr));
4472 return fold_convert_loc (loc, size_type_node, t);
4475 /* Handle C and C++ default attributes. */
4477 enum built_in_attribute
4479 #define DEF_ATTR_NULL_TREE(ENUM) ENUM,
4480 #define DEF_ATTR_INT(ENUM, VALUE) ENUM,
4481 #define DEF_ATTR_IDENT(ENUM, STRING) ENUM,
4482 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM,
4483 #include "builtin-attrs.def"
4484 #undef DEF_ATTR_NULL_TREE
4486 #undef DEF_ATTR_IDENT
4487 #undef DEF_ATTR_TREE_LIST
4491 static GTY(()) tree built_in_attributes[(int) ATTR_LAST];
4493 static void c_init_attributes (void);
4497 #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME,
4498 #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME,
4499 #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME,
4500 #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME,
4501 #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
4502 #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
4503 #define DEF_FUNCTION_TYPE_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) NAME,
4504 #define DEF_FUNCTION_TYPE_6(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6) NAME,
4505 #define DEF_FUNCTION_TYPE_7(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7) NAME,
4506 #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME,
4507 #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME,
4508 #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME,
4509 #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
4510 #define DEF_FUNCTION_TYPE_VAR_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
4511 #define DEF_FUNCTION_TYPE_VAR_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG6) \
4513 #define DEF_POINTER_TYPE(NAME, TYPE) NAME,
4514 #include "builtin-types.def"
4515 #undef DEF_PRIMITIVE_TYPE
4516 #undef DEF_FUNCTION_TYPE_0
4517 #undef DEF_FUNCTION_TYPE_1
4518 #undef DEF_FUNCTION_TYPE_2
4519 #undef DEF_FUNCTION_TYPE_3
4520 #undef DEF_FUNCTION_TYPE_4
4521 #undef DEF_FUNCTION_TYPE_5
4522 #undef DEF_FUNCTION_TYPE_6
4523 #undef DEF_FUNCTION_TYPE_7
4524 #undef DEF_FUNCTION_TYPE_VAR_0
4525 #undef DEF_FUNCTION_TYPE_VAR_1
4526 #undef DEF_FUNCTION_TYPE_VAR_2
4527 #undef DEF_FUNCTION_TYPE_VAR_3
4528 #undef DEF_FUNCTION_TYPE_VAR_4
4529 #undef DEF_FUNCTION_TYPE_VAR_5
4530 #undef DEF_POINTER_TYPE
4534 typedef enum c_builtin_type builtin_type;
4536 /* A temporary array for c_common_nodes_and_builtins. Used in
4537 communication with def_fn_type. */
4538 static tree builtin_types[(int) BT_LAST + 1];
4540 /* A helper function for c_common_nodes_and_builtins. Build function type
4541 for DEF with return type RET and N arguments. If VAR is true, then the
4542 function should be variadic after those N arguments.
4544 Takes special care not to ICE if any of the types involved are
4545 error_mark_node, which indicates that said type is not in fact available
4546 (see builtin_type_for_size). In which case the function type as a whole
4547 should be error_mark_node. */
4550 def_fn_type (builtin_type def, builtin_type ret, bool var, int n, ...)
4552 tree args = NULL, t;
4557 for (i = 0; i < n; ++i)
4559 builtin_type a = (builtin_type) va_arg (list, int);
4560 t = builtin_types[a];
4561 if (t == error_mark_node)
4563 args = tree_cons (NULL_TREE, t, args);
4567 args = nreverse (args);
4569 args = chainon (args, void_list_node);
4571 t = builtin_types[ret];
4572 if (t == error_mark_node)
4574 t = build_function_type (t, args);
4577 builtin_types[def] = t;
4580 /* Build builtin functions common to both C and C++ language
4584 c_define_builtins (tree va_list_ref_type_node, tree va_list_arg_type_node)
4586 #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \
4587 builtin_types[ENUM] = VALUE;
4588 #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \
4589 def_fn_type (ENUM, RETURN, 0, 0);
4590 #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \
4591 def_fn_type (ENUM, RETURN, 0, 1, ARG1);
4592 #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \
4593 def_fn_type (ENUM, RETURN, 0, 2, ARG1, ARG2);
4594 #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
4595 def_fn_type (ENUM, RETURN, 0, 3, ARG1, ARG2, ARG3);
4596 #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \
4597 def_fn_type (ENUM, RETURN, 0, 4, ARG1, ARG2, ARG3, ARG4);
4598 #define DEF_FUNCTION_TYPE_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \
4599 def_fn_type (ENUM, RETURN, 0, 5, ARG1, ARG2, ARG3, ARG4, ARG5);
4600 #define DEF_FUNCTION_TYPE_6(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \
4602 def_fn_type (ENUM, RETURN, 0, 6, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6);
4603 #define DEF_FUNCTION_TYPE_7(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \
4605 def_fn_type (ENUM, RETURN, 0, 7, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7);
4606 #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \
4607 def_fn_type (ENUM, RETURN, 1, 0);
4608 #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \
4609 def_fn_type (ENUM, RETURN, 1, 1, ARG1);
4610 #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \
4611 def_fn_type (ENUM, RETURN, 1, 2, ARG1, ARG2);
4612 #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
4613 def_fn_type (ENUM, RETURN, 1, 3, ARG1, ARG2, ARG3);
4614 #define DEF_FUNCTION_TYPE_VAR_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \
4615 def_fn_type (ENUM, RETURN, 1, 4, ARG1, ARG2, ARG3, ARG4);
4616 #define DEF_FUNCTION_TYPE_VAR_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \
4617 def_fn_type (ENUM, RETURN, 1, 5, ARG1, ARG2, ARG3, ARG4, ARG5);
4618 #define DEF_POINTER_TYPE(ENUM, TYPE) \
4619 builtin_types[(int) ENUM] = build_pointer_type (builtin_types[(int) TYPE]);
4621 #include "builtin-types.def"
4623 #undef DEF_PRIMITIVE_TYPE
4624 #undef DEF_FUNCTION_TYPE_1
4625 #undef DEF_FUNCTION_TYPE_2
4626 #undef DEF_FUNCTION_TYPE_3
4627 #undef DEF_FUNCTION_TYPE_4
4628 #undef DEF_FUNCTION_TYPE_5
4629 #undef DEF_FUNCTION_TYPE_6
4630 #undef DEF_FUNCTION_TYPE_VAR_0
4631 #undef DEF_FUNCTION_TYPE_VAR_1
4632 #undef DEF_FUNCTION_TYPE_VAR_2
4633 #undef DEF_FUNCTION_TYPE_VAR_3
4634 #undef DEF_FUNCTION_TYPE_VAR_4
4635 #undef DEF_FUNCTION_TYPE_VAR_5
4636 #undef DEF_POINTER_TYPE
4637 builtin_types[(int) BT_LAST] = NULL_TREE;
4639 c_init_attributes ();
4641 #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, FALLBACK_P, \
4642 NONANSI_P, ATTRS, IMPLICIT, COND) \
4644 def_builtin_1 (ENUM, NAME, CLASS, \
4645 builtin_types[(int) TYPE], \
4646 builtin_types[(int) LIBTYPE], \
4647 BOTH_P, FALLBACK_P, NONANSI_P, \
4648 built_in_attributes[(int) ATTRS], IMPLICIT);
4649 #include "builtins.def"
4652 targetm.init_builtins ();
4654 build_common_builtin_nodes ();
4660 /* Like get_identifier, but avoid warnings about null arguments when
4661 the argument may be NULL for targets where GCC lacks stdint.h type
4665 c_get_ident (const char *id)
4667 return get_identifier (id);
4670 /* Build tree nodes and builtin functions common to both C and C++ language
4674 c_common_nodes_and_builtins (void)
4676 int char16_type_size;
4677 int char32_type_size;
4678 int wchar_type_size;
4679 tree array_domain_type;
4680 tree va_list_ref_type_node;
4681 tree va_list_arg_type_node;
4683 /* Define `int' and `char' first so that dbx will output them first. */
4684 record_builtin_type (RID_INT, NULL, integer_type_node);
4685 record_builtin_type (RID_CHAR, "char", char_type_node);
4687 /* `signed' is the same as `int'. FIXME: the declarations of "signed",
4688 "unsigned long", "long long unsigned" and "unsigned short" were in C++
4689 but not C. Are the conditionals here needed? */
4690 if (c_dialect_cxx ())
4691 record_builtin_type (RID_SIGNED, NULL, integer_type_node);
4692 record_builtin_type (RID_LONG, "long int", long_integer_type_node);
4693 record_builtin_type (RID_UNSIGNED, "unsigned int", unsigned_type_node);
4694 record_builtin_type (RID_MAX, "long unsigned int",
4695 long_unsigned_type_node);
4696 if (c_dialect_cxx ())
4697 record_builtin_type (RID_MAX, "unsigned long", long_unsigned_type_node);
4698 record_builtin_type (RID_MAX, "long long int",
4699 long_long_integer_type_node);
4700 record_builtin_type (RID_MAX, "long long unsigned int",
4701 long_long_unsigned_type_node);
4702 if (c_dialect_cxx ())
4703 record_builtin_type (RID_MAX, "long long unsigned",
4704 long_long_unsigned_type_node);
4705 record_builtin_type (RID_SHORT, "short int", short_integer_type_node);
4706 record_builtin_type (RID_MAX, "short unsigned int",
4707 short_unsigned_type_node);
4708 if (c_dialect_cxx ())
4709 record_builtin_type (RID_MAX, "unsigned short",
4710 short_unsigned_type_node);
4712 /* Define both `signed char' and `unsigned char'. */
4713 record_builtin_type (RID_MAX, "signed char", signed_char_type_node);
4714 record_builtin_type (RID_MAX, "unsigned char", unsigned_char_type_node);
4716 /* These are types that c_common_type_for_size and
4717 c_common_type_for_mode use. */
4718 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4719 TYPE_DECL, NULL_TREE,
4721 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4722 TYPE_DECL, NULL_TREE,
4724 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4725 TYPE_DECL, NULL_TREE,
4727 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4728 TYPE_DECL, NULL_TREE,
4730 #if HOST_BITS_PER_WIDE_INT >= 64
4731 if (targetm.scalar_mode_supported_p (TImode))
4732 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4734 get_identifier ("__int128_t"),
4737 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4738 TYPE_DECL, NULL_TREE,
4739 unsigned_intQI_type_node));
4740 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4741 TYPE_DECL, NULL_TREE,
4742 unsigned_intHI_type_node));
4743 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4744 TYPE_DECL, NULL_TREE,
4745 unsigned_intSI_type_node));
4746 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4747 TYPE_DECL, NULL_TREE,
4748 unsigned_intDI_type_node));
4749 #if HOST_BITS_PER_WIDE_INT >= 64
4750 if (targetm.scalar_mode_supported_p (TImode))
4751 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4753 get_identifier ("__uint128_t"),
4754 unsigned_intTI_type_node));
4757 /* Create the widest literal types. */
4758 widest_integer_literal_type_node
4759 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
4760 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4761 TYPE_DECL, NULL_TREE,
4762 widest_integer_literal_type_node));
4764 widest_unsigned_literal_type_node
4765 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
4766 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4767 TYPE_DECL, NULL_TREE,
4768 widest_unsigned_literal_type_node));
4770 /* `unsigned long' is the standard type for sizeof.
4771 Note that stddef.h uses `unsigned long',
4772 and this must agree, even if long and int are the same size. */
4774 TREE_TYPE (identifier_global_value (get_identifier (SIZE_TYPE)));
4775 signed_size_type_node = c_common_signed_type (size_type_node);
4776 set_sizetype (size_type_node);
4779 TREE_TYPE (identifier_global_value (get_identifier (PID_TYPE)));
4781 build_common_tree_nodes_2 (flag_short_double);
4783 record_builtin_type (RID_FLOAT, NULL, float_type_node);
4784 record_builtin_type (RID_DOUBLE, NULL, double_type_node);
4785 record_builtin_type (RID_MAX, "long double", long_double_type_node);
4787 /* Only supported decimal floating point extension if the target
4788 actually supports underlying modes. */
4789 if (targetm.scalar_mode_supported_p (SDmode)
4790 && targetm.scalar_mode_supported_p (DDmode)
4791 && targetm.scalar_mode_supported_p (TDmode))
4793 record_builtin_type (RID_DFLOAT32, NULL, dfloat32_type_node);
4794 record_builtin_type (RID_DFLOAT64, NULL, dfloat64_type_node);
4795 record_builtin_type (RID_DFLOAT128, NULL, dfloat128_type_node);
4798 if (targetm.fixed_point_supported_p ())
4800 record_builtin_type (RID_MAX, "short _Fract", short_fract_type_node);
4801 record_builtin_type (RID_FRACT, NULL, fract_type_node);
4802 record_builtin_type (RID_MAX, "long _Fract", long_fract_type_node);
4803 record_builtin_type (RID_MAX, "long long _Fract",
4804 long_long_fract_type_node);
4805 record_builtin_type (RID_MAX, "unsigned short _Fract",
4806 unsigned_short_fract_type_node);
4807 record_builtin_type (RID_MAX, "unsigned _Fract",
4808 unsigned_fract_type_node);
4809 record_builtin_type (RID_MAX, "unsigned long _Fract",
4810 unsigned_long_fract_type_node);
4811 record_builtin_type (RID_MAX, "unsigned long long _Fract",
4812 unsigned_long_long_fract_type_node);
4813 record_builtin_type (RID_MAX, "_Sat short _Fract",
4814 sat_short_fract_type_node);
4815 record_builtin_type (RID_MAX, "_Sat _Fract", sat_fract_type_node);
4816 record_builtin_type (RID_MAX, "_Sat long _Fract",
4817 sat_long_fract_type_node);
4818 record_builtin_type (RID_MAX, "_Sat long long _Fract",
4819 sat_long_long_fract_type_node);
4820 record_builtin_type (RID_MAX, "_Sat unsigned short _Fract",
4821 sat_unsigned_short_fract_type_node);
4822 record_builtin_type (RID_MAX, "_Sat unsigned _Fract",
4823 sat_unsigned_fract_type_node);
4824 record_builtin_type (RID_MAX, "_Sat unsigned long _Fract",
4825 sat_unsigned_long_fract_type_node);
4826 record_builtin_type (RID_MAX, "_Sat unsigned long long _Fract",
4827 sat_unsigned_long_long_fract_type_node);
4828 record_builtin_type (RID_MAX, "short _Accum", short_accum_type_node);
4829 record_builtin_type (RID_ACCUM, NULL, accum_type_node);
4830 record_builtin_type (RID_MAX, "long _Accum", long_accum_type_node);
4831 record_builtin_type (RID_MAX, "long long _Accum",
4832 long_long_accum_type_node);
4833 record_builtin_type (RID_MAX, "unsigned short _Accum",
4834 unsigned_short_accum_type_node);
4835 record_builtin_type (RID_MAX, "unsigned _Accum",
4836 unsigned_accum_type_node);
4837 record_builtin_type (RID_MAX, "unsigned long _Accum",
4838 unsigned_long_accum_type_node);
4839 record_builtin_type (RID_MAX, "unsigned long long _Accum",
4840 unsigned_long_long_accum_type_node);
4841 record_builtin_type (RID_MAX, "_Sat short _Accum",
4842 sat_short_accum_type_node);
4843 record_builtin_type (RID_MAX, "_Sat _Accum", sat_accum_type_node);
4844 record_builtin_type (RID_MAX, "_Sat long _Accum",
4845 sat_long_accum_type_node);
4846 record_builtin_type (RID_MAX, "_Sat long long _Accum",
4847 sat_long_long_accum_type_node);
4848 record_builtin_type (RID_MAX, "_Sat unsigned short _Accum",
4849 sat_unsigned_short_accum_type_node);
4850 record_builtin_type (RID_MAX, "_Sat unsigned _Accum",
4851 sat_unsigned_accum_type_node);
4852 record_builtin_type (RID_MAX, "_Sat unsigned long _Accum",
4853 sat_unsigned_long_accum_type_node);
4854 record_builtin_type (RID_MAX, "_Sat unsigned long long _Accum",
4855 sat_unsigned_long_long_accum_type_node);
4859 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4861 get_identifier ("complex int"),
4862 complex_integer_type_node));
4863 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4865 get_identifier ("complex float"),
4866 complex_float_type_node));
4867 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4869 get_identifier ("complex double"),
4870 complex_double_type_node));
4871 lang_hooks.decls.pushdecl
4872 (build_decl (UNKNOWN_LOCATION,
4873 TYPE_DECL, get_identifier ("complex long double"),
4874 complex_long_double_type_node));
4876 if (c_dialect_cxx ())
4877 /* For C++, make fileptr_type_node a distinct void * type until
4878 FILE type is defined. */
4879 fileptr_type_node = build_variant_type_copy (ptr_type_node);
4881 record_builtin_type (RID_VOID, NULL, void_type_node);
4883 /* Set the TYPE_NAME for any variants that were built before
4884 record_builtin_type gave names to the built-in types. */
4886 tree void_name = TYPE_NAME (void_type_node);
4887 TYPE_NAME (void_type_node) = NULL_TREE;
4888 TYPE_NAME (build_qualified_type (void_type_node, TYPE_QUAL_CONST))
4890 TYPE_NAME (void_type_node) = void_name;
4893 /* This node must not be shared. */
4894 void_zero_node = make_node (INTEGER_CST);
4895 TREE_TYPE (void_zero_node) = void_type_node;
4897 void_list_node = build_void_list_node ();
4899 /* Make a type to be the domain of a few array types
4900 whose domains don't really matter.
4901 200 is small enough that it always fits in size_t
4902 and large enough that it can hold most function names for the
4903 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
4904 array_domain_type = build_index_type (size_int (200));
4906 /* Make a type for arrays of characters.
4907 With luck nothing will ever really depend on the length of this
4909 char_array_type_node
4910 = build_array_type (char_type_node, array_domain_type);
4912 /* Likewise for arrays of ints. */
4914 = build_array_type (integer_type_node, array_domain_type);
4916 string_type_node = build_pointer_type (char_type_node);
4917 const_string_type_node
4918 = build_pointer_type (build_qualified_type
4919 (char_type_node, TYPE_QUAL_CONST));
4921 /* This is special for C++ so functions can be overloaded. */
4922 wchar_type_node = get_identifier (MODIFIED_WCHAR_TYPE);
4923 wchar_type_node = TREE_TYPE (identifier_global_value (wchar_type_node));
4924 wchar_type_size = TYPE_PRECISION (wchar_type_node);
4925 underlying_wchar_type_node = wchar_type_node;
4926 if (c_dialect_cxx ())
4928 if (TYPE_UNSIGNED (wchar_type_node))
4929 wchar_type_node = make_unsigned_type (wchar_type_size);
4931 wchar_type_node = make_signed_type (wchar_type_size);
4932 record_builtin_type (RID_WCHAR, "wchar_t", wchar_type_node);
4935 /* This is for wide string constants. */
4936 wchar_array_type_node
4937 = build_array_type (wchar_type_node, array_domain_type);
4939 /* Define 'char16_t'. */
4940 char16_type_node = get_identifier (CHAR16_TYPE);
4941 char16_type_node = TREE_TYPE (identifier_global_value (char16_type_node));
4942 char16_type_size = TYPE_PRECISION (char16_type_node);
4943 if (c_dialect_cxx ())
4945 char16_type_node = make_unsigned_type (char16_type_size);
4947 if (cxx_dialect == cxx0x)
4948 record_builtin_type (RID_CHAR16, "char16_t", char16_type_node);
4951 /* This is for UTF-16 string constants. */
4952 char16_array_type_node
4953 = build_array_type (char16_type_node, array_domain_type);
4955 /* Define 'char32_t'. */
4956 char32_type_node = get_identifier (CHAR32_TYPE);
4957 char32_type_node = TREE_TYPE (identifier_global_value (char32_type_node));
4958 char32_type_size = TYPE_PRECISION (char32_type_node);
4959 if (c_dialect_cxx ())
4961 char32_type_node = make_unsigned_type (char32_type_size);
4963 if (cxx_dialect == cxx0x)
4964 record_builtin_type (RID_CHAR32, "char32_t", char32_type_node);
4967 /* This is for UTF-32 string constants. */
4968 char32_array_type_node
4969 = build_array_type (char32_type_node, array_domain_type);
4972 TREE_TYPE (identifier_global_value (get_identifier (WINT_TYPE)));
4975 TREE_TYPE (identifier_global_value (get_identifier (INTMAX_TYPE)));
4977 TREE_TYPE (identifier_global_value (get_identifier (UINTMAX_TYPE)));
4979 if (SIG_ATOMIC_TYPE)
4980 sig_atomic_type_node =
4981 TREE_TYPE (identifier_global_value (c_get_ident (SIG_ATOMIC_TYPE)));
4984 TREE_TYPE (identifier_global_value (c_get_ident (INT8_TYPE)));
4987 TREE_TYPE (identifier_global_value (c_get_ident (INT16_TYPE)));
4990 TREE_TYPE (identifier_global_value (c_get_ident (INT32_TYPE)));
4993 TREE_TYPE (identifier_global_value (c_get_ident (INT64_TYPE)));
4996 TREE_TYPE (identifier_global_value (c_get_ident (UINT8_TYPE)));
4999 TREE_TYPE (identifier_global_value (c_get_ident (UINT16_TYPE)));
5001 c_uint32_type_node =
5002 TREE_TYPE (identifier_global_value (c_get_ident (UINT32_TYPE)));
5004 c_uint64_type_node =
5005 TREE_TYPE (identifier_global_value (c_get_ident (UINT64_TYPE)));
5006 if (INT_LEAST8_TYPE)
5007 int_least8_type_node =
5008 TREE_TYPE (identifier_global_value (c_get_ident (INT_LEAST8_TYPE)));
5009 if (INT_LEAST16_TYPE)
5010 int_least16_type_node =
5011 TREE_TYPE (identifier_global_value (c_get_ident (INT_LEAST16_TYPE)));
5012 if (INT_LEAST32_TYPE)
5013 int_least32_type_node =
5014 TREE_TYPE (identifier_global_value (c_get_ident (INT_LEAST32_TYPE)));
5015 if (INT_LEAST64_TYPE)
5016 int_least64_type_node =
5017 TREE_TYPE (identifier_global_value (c_get_ident (INT_LEAST64_TYPE)));
5018 if (UINT_LEAST8_TYPE)
5019 uint_least8_type_node =
5020 TREE_TYPE (identifier_global_value (c_get_ident (UINT_LEAST8_TYPE)));
5021 if (UINT_LEAST16_TYPE)
5022 uint_least16_type_node =
5023 TREE_TYPE (identifier_global_value (c_get_ident (UINT_LEAST16_TYPE)));
5024 if (UINT_LEAST32_TYPE)
5025 uint_least32_type_node =
5026 TREE_TYPE (identifier_global_value (c_get_ident (UINT_LEAST32_TYPE)));
5027 if (UINT_LEAST64_TYPE)
5028 uint_least64_type_node =
5029 TREE_TYPE (identifier_global_value (c_get_ident (UINT_LEAST64_TYPE)));
5031 int_fast8_type_node =
5032 TREE_TYPE (identifier_global_value (c_get_ident (INT_FAST8_TYPE)));
5033 if (INT_FAST16_TYPE)
5034 int_fast16_type_node =
5035 TREE_TYPE (identifier_global_value (c_get_ident (INT_FAST16_TYPE)));
5036 if (INT_FAST32_TYPE)
5037 int_fast32_type_node =
5038 TREE_TYPE (identifier_global_value (c_get_ident (INT_FAST32_TYPE)));
5039 if (INT_FAST64_TYPE)
5040 int_fast64_type_node =
5041 TREE_TYPE (identifier_global_value (c_get_ident (INT_FAST64_TYPE)));
5042 if (UINT_FAST8_TYPE)
5043 uint_fast8_type_node =
5044 TREE_TYPE (identifier_global_value (c_get_ident (UINT_FAST8_TYPE)));
5045 if (UINT_FAST16_TYPE)
5046 uint_fast16_type_node =
5047 TREE_TYPE (identifier_global_value (c_get_ident (UINT_FAST16_TYPE)));
5048 if (UINT_FAST32_TYPE)
5049 uint_fast32_type_node =
5050 TREE_TYPE (identifier_global_value (c_get_ident (UINT_FAST32_TYPE)));
5051 if (UINT_FAST64_TYPE)
5052 uint_fast64_type_node =
5053 TREE_TYPE (identifier_global_value (c_get_ident (UINT_FAST64_TYPE)));
5056 TREE_TYPE (identifier_global_value (c_get_ident (INTPTR_TYPE)));
5059 TREE_TYPE (identifier_global_value (c_get_ident (UINTPTR_TYPE)));
5061 default_function_type = build_function_type (integer_type_node, NULL_TREE);
5063 = TREE_TYPE (identifier_global_value (get_identifier (PTRDIFF_TYPE)));
5064 unsigned_ptrdiff_type_node = c_common_unsigned_type (ptrdiff_type_node);
5066 lang_hooks.decls.pushdecl
5067 (build_decl (UNKNOWN_LOCATION,
5068 TYPE_DECL, get_identifier ("__builtin_va_list"),
5069 va_list_type_node));
5070 #ifdef TARGET_ENUM_VA_LIST
5075 for (l = 0; TARGET_ENUM_VA_LIST (l, &pname, &ptype); ++l)
5077 lang_hooks.decls.pushdecl
5078 (build_decl (UNKNOWN_LOCATION,
5079 TYPE_DECL, get_identifier (pname),
5086 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
5088 va_list_arg_type_node = va_list_ref_type_node =
5089 build_pointer_type (TREE_TYPE (va_list_type_node));
5093 va_list_arg_type_node = va_list_type_node;
5094 va_list_ref_type_node = build_reference_type (va_list_type_node);
5097 if (!flag_preprocess_only)
5098 c_define_builtins (va_list_ref_type_node, va_list_arg_type_node);
5100 main_identifier_node = get_identifier ("main");
5102 /* Create the built-in __null node. It is important that this is
5104 null_node = make_node (INTEGER_CST);
5105 TREE_TYPE (null_node) = c_common_type_for_size (POINTER_SIZE, 0);
5107 /* Since builtin_types isn't gc'ed, don't export these nodes. */
5108 memset (builtin_types, 0, sizeof (builtin_types));
5111 /* The number of named compound-literals generated thus far. */
5112 static GTY(()) int compound_literal_number;
5114 /* Set DECL_NAME for DECL, a VAR_DECL for a compound-literal. */
5117 set_compound_literal_name (tree decl)
5120 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
5121 compound_literal_number);
5122 compound_literal_number++;
5123 DECL_NAME (decl) = get_identifier (name);
5127 build_va_arg (location_t loc, tree expr, tree type)
5129 expr = build1 (VA_ARG_EXPR, type, expr);
5130 SET_EXPR_LOCATION (expr, loc);
5135 /* Linked list of disabled built-in functions. */
5137 typedef struct disabled_builtin
5140 struct disabled_builtin *next;
5142 static disabled_builtin *disabled_builtins = NULL;
5144 static bool builtin_function_disabled_p (const char *);
5146 /* Disable a built-in function specified by -fno-builtin-NAME. If NAME
5147 begins with "__builtin_", give an error. */
5150 disable_builtin_function (const char *name)
5152 if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0)
5153 error ("cannot disable built-in function %qs", name);
5156 disabled_builtin *new_disabled_builtin = XNEW (disabled_builtin);
5157 new_disabled_builtin->name = name;
5158 new_disabled_builtin->next = disabled_builtins;
5159 disabled_builtins = new_disabled_builtin;
5164 /* Return true if the built-in function NAME has been disabled, false
5168 builtin_function_disabled_p (const char *name)
5170 disabled_builtin *p;
5171 for (p = disabled_builtins; p != NULL; p = p->next)
5173 if (strcmp (name, p->name) == 0)
5180 /* Worker for DEF_BUILTIN.
5181 Possibly define a builtin function with one or two names.
5182 Does not declare a non-__builtin_ function if flag_no_builtin, or if
5183 nonansi_p and flag_no_nonansi_builtin. */
5186 def_builtin_1 (enum built_in_function fncode,
5188 enum built_in_class fnclass,
5189 tree fntype, tree libtype,
5190 bool both_p, bool fallback_p, bool nonansi_p,
5191 tree fnattrs, bool implicit_p)
5194 const char *libname;
5196 if (fntype == error_mark_node)
5199 gcc_assert ((!both_p && !fallback_p)
5200 || !strncmp (name, "__builtin_",
5201 strlen ("__builtin_")));
5203 libname = name + strlen ("__builtin_");
5204 decl = add_builtin_function (name, fntype, fncode, fnclass,
5205 (fallback_p ? libname : NULL),
5208 && !flag_no_builtin && !builtin_function_disabled_p (libname)
5209 && !(nonansi_p && flag_no_nonansi_builtin))
5210 add_builtin_function (libname, libtype, fncode, fnclass,
5213 built_in_decls[(int) fncode] = decl;
5215 implicit_built_in_decls[(int) fncode] = decl;
5218 /* Nonzero if the type T promotes to int. This is (nearly) the
5219 integral promotions defined in ISO C99 6.3.1.1/2. */
5222 c_promoting_integer_type_p (const_tree t)
5224 switch (TREE_CODE (t))
5227 return (TYPE_MAIN_VARIANT (t) == char_type_node
5228 || TYPE_MAIN_VARIANT (t) == signed_char_type_node
5229 || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node
5230 || TYPE_MAIN_VARIANT (t) == short_integer_type_node
5231 || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node
5232 || TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node));
5235 /* ??? Technically all enumerations not larger than an int
5236 promote to an int. But this is used along code paths
5237 that only want to notice a size change. */
5238 return TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node);
5248 /* Return 1 if PARMS specifies a fixed number of parameters
5249 and none of their types is affected by default promotions. */
5252 self_promoting_args_p (const_tree parms)
5255 for (t = parms; t; t = TREE_CHAIN (t))
5257 tree type = TREE_VALUE (t);
5259 if (type == error_mark_node)
5262 if (TREE_CHAIN (t) == 0 && type != void_type_node)
5268 if (TYPE_MAIN_VARIANT (type) == float_type_node)
5271 if (c_promoting_integer_type_p (type))
5277 /* Recursively remove any '*' or '&' operator from TYPE. */
5279 strip_pointer_operator (tree t)
5281 while (POINTER_TYPE_P (t))
5286 /* Recursively remove pointer or array type from TYPE. */
5288 strip_pointer_or_array_types (tree t)
5290 while (TREE_CODE (t) == ARRAY_TYPE || POINTER_TYPE_P (t))
5295 /* Used to compare case labels. K1 and K2 are actually tree nodes
5296 representing case labels, or NULL_TREE for a `default' label.
5297 Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after
5298 K2, and 0 if K1 and K2 are equal. */
5301 case_compare (splay_tree_key k1, splay_tree_key k2)
5303 /* Consider a NULL key (such as arises with a `default' label) to be
5304 smaller than anything else. */
5310 return tree_int_cst_compare ((tree) k1, (tree) k2);
5313 /* Process a case label, located at LOC, for the range LOW_VALUE
5314 ... HIGH_VALUE. If LOW_VALUE and HIGH_VALUE are both NULL_TREE
5315 then this case label is actually a `default' label. If only
5316 HIGH_VALUE is NULL_TREE, then case label was declared using the
5317 usual C/C++ syntax, rather than the GNU case range extension.
5318 CASES is a tree containing all the case ranges processed so far;
5319 COND is the condition for the switch-statement itself. Returns the
5320 CASE_LABEL_EXPR created, or ERROR_MARK_NODE if no CASE_LABEL_EXPR
5324 c_add_case_label (location_t loc, splay_tree cases, tree cond, tree orig_type,
5325 tree low_value, tree high_value)
5330 splay_tree_node node;
5332 /* Create the LABEL_DECL itself. */
5333 label = create_artificial_label (loc);
5335 /* If there was an error processing the switch condition, bail now
5336 before we get more confused. */
5337 if (!cond || cond == error_mark_node)
5340 if ((low_value && TREE_TYPE (low_value)
5341 && POINTER_TYPE_P (TREE_TYPE (low_value)))
5342 || (high_value && TREE_TYPE (high_value)
5343 && POINTER_TYPE_P (TREE_TYPE (high_value))))
5345 error_at (loc, "pointers are not permitted as case values");
5349 /* Case ranges are a GNU extension. */
5351 pedwarn (loc, OPT_pedantic,
5352 "range expressions in switch statements are non-standard");
5354 type = TREE_TYPE (cond);
5357 low_value = check_case_value (low_value);
5358 low_value = convert_and_check (type, low_value);
5359 if (low_value == error_mark_node)
5364 high_value = check_case_value (high_value);
5365 high_value = convert_and_check (type, high_value);
5366 if (high_value == error_mark_node)
5370 if (low_value && high_value)
5372 /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't
5373 really a case range, even though it was written that way.
5374 Remove the HIGH_VALUE to simplify later processing. */
5375 if (tree_int_cst_equal (low_value, high_value))
5376 high_value = NULL_TREE;
5377 else if (!tree_int_cst_lt (low_value, high_value))
5378 warning_at (loc, 0, "empty range specified");
5381 /* See if the case is in range of the type of the original testing
5382 expression. If both low_value and high_value are out of range,
5383 don't insert the case label and return NULL_TREE. */
5385 && !check_case_bounds (type, orig_type,
5386 &low_value, high_value ? &high_value : NULL))
5389 /* Look up the LOW_VALUE in the table of case labels we already
5391 node = splay_tree_lookup (cases, (splay_tree_key) low_value);
5392 /* If there was not an exact match, check for overlapping ranges.
5393 There's no need to do this if there's no LOW_VALUE or HIGH_VALUE;
5394 that's a `default' label and the only overlap is an exact match. */
5395 if (!node && (low_value || high_value))
5397 splay_tree_node low_bound;
5398 splay_tree_node high_bound;
5400 /* Even though there wasn't an exact match, there might be an
5401 overlap between this case range and another case range.
5402 Since we've (inductively) not allowed any overlapping case
5403 ranges, we simply need to find the greatest low case label
5404 that is smaller that LOW_VALUE, and the smallest low case
5405 label that is greater than LOW_VALUE. If there is an overlap
5406 it will occur in one of these two ranges. */
5407 low_bound = splay_tree_predecessor (cases,
5408 (splay_tree_key) low_value);
5409 high_bound = splay_tree_successor (cases,
5410 (splay_tree_key) low_value);
5412 /* Check to see if the LOW_BOUND overlaps. It is smaller than
5413 the LOW_VALUE, so there is no need to check unless the
5414 LOW_BOUND is in fact itself a case range. */
5416 && CASE_HIGH ((tree) low_bound->value)
5417 && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value),
5420 /* Check to see if the HIGH_BOUND overlaps. The low end of that
5421 range is bigger than the low end of the current range, so we
5422 are only interested if the current range is a real range, and
5423 not an ordinary case label. */
5426 && (tree_int_cst_compare ((tree) high_bound->key,
5431 /* If there was an overlap, issue an error. */
5434 tree duplicate = CASE_LABEL ((tree) node->value);
5438 error_at (loc, "duplicate (or overlapping) case value");
5439 error_at (DECL_SOURCE_LOCATION (duplicate),
5440 "this is the first entry overlapping that value");
5444 error_at (loc, "duplicate case value") ;
5445 error_at (DECL_SOURCE_LOCATION (duplicate), "previously used here");
5449 error_at (loc, "multiple default labels in one switch");
5450 error_at (DECL_SOURCE_LOCATION (duplicate),
5451 "this is the first default label");
5456 /* Add a CASE_LABEL to the statement-tree. */
5457 case_label = add_stmt (build_case_label (loc, low_value, high_value, label));
5458 /* Register this case label in the splay tree. */
5459 splay_tree_insert (cases,
5460 (splay_tree_key) low_value,
5461 (splay_tree_value) case_label);
5466 /* Add a label so that the back-end doesn't think that the beginning of
5467 the switch is unreachable. Note that we do not add a case label, as
5468 that just leads to duplicates and thence to failure later on. */
5471 tree t = create_artificial_label (loc);
5472 add_stmt (build_stmt (loc, LABEL_EXPR, t));
5474 return error_mark_node;
5477 /* Subroutines of c_do_switch_warnings, called via splay_tree_foreach.
5478 Used to verify that case values match up with enumerator values. */
5481 match_case_to_enum_1 (tree key, tree type, tree label)
5483 char buf[2 + 2*HOST_BITS_PER_WIDE_INT/4 + 1];
5485 /* ??? Not working too hard to print the double-word value.
5486 Should perhaps be done with %lwd in the diagnostic routines? */
5487 if (TREE_INT_CST_HIGH (key) == 0)
5488 snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_UNSIGNED,
5489 TREE_INT_CST_LOW (key));
5490 else if (!TYPE_UNSIGNED (type)
5491 && TREE_INT_CST_HIGH (key) == -1
5492 && TREE_INT_CST_LOW (key) != 0)
5493 snprintf (buf, sizeof (buf), "-" HOST_WIDE_INT_PRINT_UNSIGNED,
5494 -TREE_INT_CST_LOW (key));
5496 snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_DOUBLE_HEX,
5497 (unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (key),
5498 (unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (key));
5500 if (TYPE_NAME (type) == 0)
5501 warning_at (DECL_SOURCE_LOCATION (CASE_LABEL (label)),
5502 warn_switch ? OPT_Wswitch : OPT_Wswitch_enum,
5503 "case value %qs not in enumerated type",
5506 warning_at (DECL_SOURCE_LOCATION (CASE_LABEL (label)),
5507 warn_switch ? OPT_Wswitch : OPT_Wswitch_enum,
5508 "case value %qs not in enumerated type %qT",
5512 /* Subroutine of c_do_switch_warnings, called via splay_tree_foreach.
5513 Used to verify that case values match up with enumerator values. */
5516 match_case_to_enum (splay_tree_node node, void *data)
5518 tree label = (tree) node->value;
5519 tree type = (tree) data;
5521 /* Skip default case. */
5522 if (!CASE_LOW (label))
5525 /* If CASE_LOW_SEEN is not set, that means CASE_LOW did not appear
5526 when we did our enum->case scan. Reset our scratch bit after. */
5527 if (!CASE_LOW_SEEN (label))
5528 match_case_to_enum_1 (CASE_LOW (label), type, label);
5530 CASE_LOW_SEEN (label) = 0;
5532 /* If CASE_HIGH is non-null, we have a range. If CASE_HIGH_SEEN is
5533 not set, that means that CASE_HIGH did not appear when we did our
5534 enum->case scan. Reset our scratch bit after. */
5535 if (CASE_HIGH (label))
5537 if (!CASE_HIGH_SEEN (label))
5538 match_case_to_enum_1 (CASE_HIGH (label), type, label);
5540 CASE_HIGH_SEEN (label) = 0;
5546 /* Handle -Wswitch*. Called from the front end after parsing the
5547 switch construct. */
5548 /* ??? Should probably be somewhere generic, since other languages
5549 besides C and C++ would want this. At the moment, however, C/C++
5550 are the only tree-ssa languages that support enumerations at all,
5551 so the point is moot. */
5554 c_do_switch_warnings (splay_tree cases, location_t switch_location,
5555 tree type, tree cond)
5557 splay_tree_node default_node;
5558 splay_tree_node node;
5561 if (!warn_switch && !warn_switch_enum && !warn_switch_default)
5564 default_node = splay_tree_lookup (cases, (splay_tree_key) NULL);
5566 warning_at (switch_location, OPT_Wswitch_default,
5567 "switch missing default case");
5569 /* From here on, we only care about about enumerated types. */
5570 if (!type || TREE_CODE (type) != ENUMERAL_TYPE)
5573 /* From here on, we only care about -Wswitch and -Wswitch-enum. */
5574 if (!warn_switch_enum && !warn_switch)
5577 /* Check the cases. Warn about case values which are not members of
5578 the enumerated type. For -Wswitch-enum, or for -Wswitch when
5579 there is no default case, check that exactly all enumeration
5580 literals are covered by the cases. */
5582 /* Clearing COND if it is not an integer constant simplifies
5583 the tests inside the loop below. */
5584 if (TREE_CODE (cond) != INTEGER_CST)
5587 /* The time complexity here is O(N*lg(N)) worst case, but for the
5588 common case of monotonically increasing enumerators, it is
5589 O(N), since the nature of the splay tree will keep the next
5590 element adjacent to the root at all times. */
5592 for (chain = TYPE_VALUES (type); chain; chain = TREE_CHAIN (chain))
5594 tree value = TREE_VALUE (chain);
5595 if (TREE_CODE (value) == CONST_DECL)
5596 value = DECL_INITIAL (value);
5597 node = splay_tree_lookup (cases, (splay_tree_key) value);
5600 /* Mark the CASE_LOW part of the case entry as seen. */
5601 tree label = (tree) node->value;
5602 CASE_LOW_SEEN (label) = 1;
5606 /* Even though there wasn't an exact match, there might be a
5607 case range which includes the enumerator's value. */
5608 node = splay_tree_predecessor (cases, (splay_tree_key) value);
5609 if (node && CASE_HIGH ((tree) node->value))
5611 tree label = (tree) node->value;
5612 int cmp = tree_int_cst_compare (CASE_HIGH (label), value);
5615 /* If we match the upper bound exactly, mark the CASE_HIGH
5616 part of the case entry as seen. */
5618 CASE_HIGH_SEEN (label) = 1;
5623 /* We've now determined that this enumerated literal isn't
5624 handled by the case labels of the switch statement. */
5626 /* If the switch expression is a constant, we only really care
5627 about whether that constant is handled by the switch. */
5628 if (cond && tree_int_cst_compare (cond, value))
5631 /* If there is a default_node, the only relevant option is
5632 Wswitch-enum. Otherwise, if both are enabled then we prefer
5633 to warn using -Wswitch because -Wswitch is enabled by -Wall
5634 while -Wswitch-enum is explicit. */
5635 warning_at (switch_location,
5636 (default_node || !warn_switch
5639 "enumeration value %qE not handled in switch",
5640 TREE_PURPOSE (chain));
5643 /* Warn if there are case expressions that don't correspond to
5644 enumerators. This can occur since C and C++ don't enforce
5645 type-checking of assignments to enumeration variables.
5647 The time complexity here is now always O(N) worst case, since
5648 we should have marked both the lower bound and upper bound of
5649 every disjoint case label, with CASE_LOW_SEEN and CASE_HIGH_SEEN
5650 above. This scan also resets those fields. */
5652 splay_tree_foreach (cases, match_case_to_enum, type);
5655 /* Finish an expression taking the address of LABEL (an
5656 IDENTIFIER_NODE). Returns an expression for the address.
5658 LOC is the location for the expression returned. */
5661 finish_label_address_expr (tree label, location_t loc)
5665 pedwarn (input_location, OPT_pedantic, "taking the address of a label is non-standard");
5667 if (label == error_mark_node)
5668 return error_mark_node;
5670 label = lookup_label (label);
5671 if (label == NULL_TREE)
5672 result = null_pointer_node;
5675 TREE_USED (label) = 1;
5676 result = build1 (ADDR_EXPR, ptr_type_node, label);
5677 /* The current function is not necessarily uninlinable.
5678 Computed gotos are incompatible with inlining, but the value
5679 here could be used only in a diagnostic, for example. */
5680 protected_set_expr_location (result, loc);
5687 /* Given a boolean expression ARG, return a tree representing an increment
5688 or decrement (as indicated by CODE) of ARG. The front end must check for
5689 invalid cases (e.g., decrement in C++). */
5691 boolean_increment (enum tree_code code, tree arg)
5694 tree true_res = build_int_cst (TREE_TYPE (arg), 1);
5696 arg = stabilize_reference (arg);
5699 case PREINCREMENT_EXPR:
5700 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res);
5702 case POSTINCREMENT_EXPR:
5703 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res);
5704 arg = save_expr (arg);
5705 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg);
5706 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val);
5708 case PREDECREMENT_EXPR:
5709 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg,
5710 invert_truthvalue_loc (input_location, arg));
5712 case POSTDECREMENT_EXPR:
5713 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg,
5714 invert_truthvalue_loc (input_location, arg));
5715 arg = save_expr (arg);
5716 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg);
5717 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val);
5722 TREE_SIDE_EFFECTS (val) = 1;
5726 /* Built-in macros for stddef.h and stdint.h, that require macros
5727 defined in this file. */
5729 c_stddef_cpp_builtins(void)
5731 builtin_define_with_value ("__SIZE_TYPE__", SIZE_TYPE, 0);
5732 builtin_define_with_value ("__PTRDIFF_TYPE__", PTRDIFF_TYPE, 0);
5733 builtin_define_with_value ("__WCHAR_TYPE__", MODIFIED_WCHAR_TYPE, 0);
5734 builtin_define_with_value ("__WINT_TYPE__", WINT_TYPE, 0);
5735 builtin_define_with_value ("__INTMAX_TYPE__", INTMAX_TYPE, 0);
5736 builtin_define_with_value ("__UINTMAX_TYPE__", UINTMAX_TYPE, 0);
5737 builtin_define_with_value ("__CHAR16_TYPE__", CHAR16_TYPE, 0);
5738 builtin_define_with_value ("__CHAR32_TYPE__", CHAR32_TYPE, 0);
5739 if (SIG_ATOMIC_TYPE)
5740 builtin_define_with_value ("__SIG_ATOMIC_TYPE__", SIG_ATOMIC_TYPE, 0);
5742 builtin_define_with_value ("__INT8_TYPE__", INT8_TYPE, 0);
5744 builtin_define_with_value ("__INT16_TYPE__", INT16_TYPE, 0);
5746 builtin_define_with_value ("__INT32_TYPE__", INT32_TYPE, 0);
5748 builtin_define_with_value ("__INT64_TYPE__", INT64_TYPE, 0);
5750 builtin_define_with_value ("__UINT8_TYPE__", UINT8_TYPE, 0);
5752 builtin_define_with_value ("__UINT16_TYPE__", UINT16_TYPE, 0);
5754 builtin_define_with_value ("__UINT32_TYPE__", UINT32_TYPE, 0);
5756 builtin_define_with_value ("__UINT64_TYPE__", UINT64_TYPE, 0);
5757 if (INT_LEAST8_TYPE)
5758 builtin_define_with_value ("__INT_LEAST8_TYPE__", INT_LEAST8_TYPE, 0);
5759 if (INT_LEAST16_TYPE)
5760 builtin_define_with_value ("__INT_LEAST16_TYPE__", INT_LEAST16_TYPE, 0);
5761 if (INT_LEAST32_TYPE)
5762 builtin_define_with_value ("__INT_LEAST32_TYPE__", INT_LEAST32_TYPE, 0);
5763 if (INT_LEAST64_TYPE)
5764 builtin_define_with_value ("__INT_LEAST64_TYPE__", INT_LEAST64_TYPE, 0);
5765 if (UINT_LEAST8_TYPE)
5766 builtin_define_with_value ("__UINT_LEAST8_TYPE__", UINT_LEAST8_TYPE, 0);
5767 if (UINT_LEAST16_TYPE)
5768 builtin_define_with_value ("__UINT_LEAST16_TYPE__", UINT_LEAST16_TYPE, 0);
5769 if (UINT_LEAST32_TYPE)
5770 builtin_define_with_value ("__UINT_LEAST32_TYPE__", UINT_LEAST32_TYPE, 0);
5771 if (UINT_LEAST64_TYPE)
5772 builtin_define_with_value ("__UINT_LEAST64_TYPE__", UINT_LEAST64_TYPE, 0);
5774 builtin_define_with_value ("__INT_FAST8_TYPE__", INT_FAST8_TYPE, 0);
5775 if (INT_FAST16_TYPE)
5776 builtin_define_with_value ("__INT_FAST16_TYPE__", INT_FAST16_TYPE, 0);
5777 if (INT_FAST32_TYPE)
5778 builtin_define_with_value ("__INT_FAST32_TYPE__", INT_FAST32_TYPE, 0);
5779 if (INT_FAST64_TYPE)
5780 builtin_define_with_value ("__INT_FAST64_TYPE__", INT_FAST64_TYPE, 0);
5781 if (UINT_FAST8_TYPE)
5782 builtin_define_with_value ("__UINT_FAST8_TYPE__", UINT_FAST8_TYPE, 0);
5783 if (UINT_FAST16_TYPE)
5784 builtin_define_with_value ("__UINT_FAST16_TYPE__", UINT_FAST16_TYPE, 0);
5785 if (UINT_FAST32_TYPE)
5786 builtin_define_with_value ("__UINT_FAST32_TYPE__", UINT_FAST32_TYPE, 0);
5787 if (UINT_FAST64_TYPE)
5788 builtin_define_with_value ("__UINT_FAST64_TYPE__", UINT_FAST64_TYPE, 0);
5790 builtin_define_with_value ("__INTPTR_TYPE__", INTPTR_TYPE, 0);
5792 builtin_define_with_value ("__UINTPTR_TYPE__", UINTPTR_TYPE, 0);
5796 c_init_attributes (void)
5798 /* Fill in the built_in_attributes array. */
5799 #define DEF_ATTR_NULL_TREE(ENUM) \
5800 built_in_attributes[(int) ENUM] = NULL_TREE;
5801 #define DEF_ATTR_INT(ENUM, VALUE) \
5802 built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE);
5803 #define DEF_ATTR_IDENT(ENUM, STRING) \
5804 built_in_attributes[(int) ENUM] = get_identifier (STRING);
5805 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \
5806 built_in_attributes[(int) ENUM] \
5807 = tree_cons (built_in_attributes[(int) PURPOSE], \
5808 built_in_attributes[(int) VALUE], \
5809 built_in_attributes[(int) CHAIN]);
5810 #include "builtin-attrs.def"
5811 #undef DEF_ATTR_NULL_TREE
5813 #undef DEF_ATTR_IDENT
5814 #undef DEF_ATTR_TREE_LIST
5817 /* Returns TRUE iff the attribute indicated by ATTR_ID takes a plain
5818 identifier as an argument, so the front end shouldn't look it up. */
5821 attribute_takes_identifier_p (tree attr_id)
5823 return (is_attribute_p ("mode", attr_id)
5824 || is_attribute_p ("format", attr_id)
5825 || is_attribute_p ("cleanup", attr_id));
5828 /* Attribute handlers common to C front ends. */
5830 /* Handle a "packed" attribute; arguments as in
5831 struct attribute_spec.handler. */
5834 handle_packed_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5835 int flags, bool *no_add_attrs)
5839 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
5840 *node = build_variant_type_copy (*node);
5841 TYPE_PACKED (*node) = 1;
5843 else if (TREE_CODE (*node) == FIELD_DECL)
5845 if (TYPE_ALIGN (TREE_TYPE (*node)) <= BITS_PER_UNIT
5846 /* Still pack bitfields. */
5847 && ! DECL_INITIAL (*node))
5848 warning (OPT_Wattributes,
5849 "%qE attribute ignored for field of type %qT",
5850 name, TREE_TYPE (*node));
5852 DECL_PACKED (*node) = 1;
5854 /* We can't set DECL_PACKED for a VAR_DECL, because the bit is
5855 used for DECL_REGISTER. It wouldn't mean anything anyway.
5856 We can't set DECL_PACKED on the type of a TYPE_DECL, because
5857 that changes what the typedef is typing. */
5860 warning (OPT_Wattributes, "%qE attribute ignored", name);
5861 *no_add_attrs = true;
5867 /* Handle a "nocommon" attribute; arguments as in
5868 struct attribute_spec.handler. */
5871 handle_nocommon_attribute (tree *node, tree name,
5872 tree ARG_UNUSED (args),
5873 int ARG_UNUSED (flags), bool *no_add_attrs)
5875 if (TREE_CODE (*node) == VAR_DECL)
5876 DECL_COMMON (*node) = 0;
5879 warning (OPT_Wattributes, "%qE attribute ignored", name);
5880 *no_add_attrs = true;
5886 /* Handle a "common" attribute; arguments as in
5887 struct attribute_spec.handler. */
5890 handle_common_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5891 int ARG_UNUSED (flags), bool *no_add_attrs)
5893 if (TREE_CODE (*node) == VAR_DECL)
5894 DECL_COMMON (*node) = 1;
5897 warning (OPT_Wattributes, "%qE attribute ignored", name);
5898 *no_add_attrs = true;
5904 /* Handle a "noreturn" attribute; arguments as in
5905 struct attribute_spec.handler. */
5908 handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5909 int ARG_UNUSED (flags), bool *no_add_attrs)
5911 tree type = TREE_TYPE (*node);
5913 /* See FIXME comment in c_common_attribute_table. */
5914 if (TREE_CODE (*node) == FUNCTION_DECL)
5915 TREE_THIS_VOLATILE (*node) = 1;
5916 else if (TREE_CODE (type) == POINTER_TYPE
5917 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
5919 = build_pointer_type
5920 (build_type_variant (TREE_TYPE (type),
5921 TYPE_READONLY (TREE_TYPE (type)), 1));
5924 warning (OPT_Wattributes, "%qE attribute ignored", name);
5925 *no_add_attrs = true;
5931 /* Handle a "hot" and attribute; arguments as in
5932 struct attribute_spec.handler. */
5935 handle_hot_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5936 int ARG_UNUSED (flags), bool *no_add_attrs)
5938 if (TREE_CODE (*node) == FUNCTION_DECL)
5940 if (lookup_attribute ("cold", DECL_ATTRIBUTES (*node)) != NULL)
5942 warning (OPT_Wattributes, "%qE attribute conflicts with attribute %s",
5944 *no_add_attrs = true;
5946 /* Most of the rest of the hot processing is done later with
5947 lookup_attribute. */
5951 warning (OPT_Wattributes, "%qE attribute ignored", name);
5952 *no_add_attrs = true;
5957 /* Handle a "cold" and attribute; arguments as in
5958 struct attribute_spec.handler. */
5961 handle_cold_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5962 int ARG_UNUSED (flags), bool *no_add_attrs)
5964 if (TREE_CODE (*node) == FUNCTION_DECL)
5966 if (lookup_attribute ("hot", DECL_ATTRIBUTES (*node)) != NULL)
5968 warning (OPT_Wattributes, "%qE attribute conflicts with attribute %s",
5970 *no_add_attrs = true;
5972 /* Most of the rest of the cold processing is done later with
5973 lookup_attribute. */
5977 warning (OPT_Wattributes, "%qE attribute ignored", name);
5978 *no_add_attrs = true;
5984 /* Handle a "noinline" attribute; arguments as in
5985 struct attribute_spec.handler. */
5988 handle_noinline_attribute (tree *node, tree name,
5989 tree ARG_UNUSED (args),
5990 int ARG_UNUSED (flags), bool *no_add_attrs)
5992 if (TREE_CODE (*node) == FUNCTION_DECL)
5993 DECL_UNINLINABLE (*node) = 1;
5996 warning (OPT_Wattributes, "%qE attribute ignored", name);
5997 *no_add_attrs = true;
6003 /* Handle a "noclone" attribute; arguments as in
6004 struct attribute_spec.handler. */
6007 handle_noclone_attribute (tree *node, tree name,
6008 tree ARG_UNUSED (args),
6009 int ARG_UNUSED (flags), bool *no_add_attrs)
6011 if (TREE_CODE (*node) != FUNCTION_DECL)
6013 warning (OPT_Wattributes, "%qE attribute ignored", name);
6014 *no_add_attrs = true;
6020 /* Handle a "always_inline" attribute; arguments as in
6021 struct attribute_spec.handler. */
6024 handle_always_inline_attribute (tree *node, tree name,
6025 tree ARG_UNUSED (args),
6026 int ARG_UNUSED (flags),
6029 if (TREE_CODE (*node) == FUNCTION_DECL)
6031 /* Set the attribute and mark it for disregarding inline
6033 DECL_DISREGARD_INLINE_LIMITS (*node) = 1;
6037 warning (OPT_Wattributes, "%qE attribute ignored", name);
6038 *no_add_attrs = true;
6044 /* Handle a "gnu_inline" attribute; arguments as in
6045 struct attribute_spec.handler. */
6048 handle_gnu_inline_attribute (tree *node, tree name,
6049 tree ARG_UNUSED (args),
6050 int ARG_UNUSED (flags),
6053 if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node))
6055 /* Do nothing else, just set the attribute. We'll get at
6056 it later with lookup_attribute. */
6060 warning (OPT_Wattributes, "%qE attribute ignored", name);
6061 *no_add_attrs = true;
6067 /* Handle an "artificial" attribute; arguments as in
6068 struct attribute_spec.handler. */
6071 handle_artificial_attribute (tree *node, tree name,
6072 tree ARG_UNUSED (args),
6073 int ARG_UNUSED (flags),
6076 if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node))
6078 /* Do nothing else, just set the attribute. We'll get at
6079 it later with lookup_attribute. */
6083 warning (OPT_Wattributes, "%qE attribute ignored", name);
6084 *no_add_attrs = true;
6090 /* Handle a "flatten" attribute; arguments as in
6091 struct attribute_spec.handler. */
6094 handle_flatten_attribute (tree *node, tree name,
6095 tree args ATTRIBUTE_UNUSED,
6096 int flags ATTRIBUTE_UNUSED, bool *no_add_attrs)
6098 if (TREE_CODE (*node) == FUNCTION_DECL)
6099 /* Do nothing else, just set the attribute. We'll get at
6100 it later with lookup_attribute. */
6104 warning (OPT_Wattributes, "%qE attribute ignored", name);
6105 *no_add_attrs = true;
6111 /* Handle a "warning" or "error" attribute; arguments as in
6112 struct attribute_spec.handler. */
6115 handle_error_attribute (tree *node, tree name, tree args,
6116 int ARG_UNUSED (flags), bool *no_add_attrs)
6118 if (TREE_CODE (*node) == FUNCTION_DECL
6119 || TREE_CODE (TREE_VALUE (args)) == STRING_CST)
6120 /* Do nothing else, just set the attribute. We'll get at
6121 it later with lookup_attribute. */
6125 warning (OPT_Wattributes, "%qE attribute ignored", name);
6126 *no_add_attrs = true;
6132 /* Handle a "used" attribute; arguments as in
6133 struct attribute_spec.handler. */
6136 handle_used_attribute (tree *pnode, tree name, tree ARG_UNUSED (args),
6137 int ARG_UNUSED (flags), bool *no_add_attrs)
6141 if (TREE_CODE (node) == FUNCTION_DECL
6142 || (TREE_CODE (node) == VAR_DECL && TREE_STATIC (node)))
6144 TREE_USED (node) = 1;
6145 DECL_PRESERVE_P (node) = 1;
6146 if (TREE_CODE (node) == VAR_DECL)
6147 DECL_READ_P (node) = 1;
6151 warning (OPT_Wattributes, "%qE attribute ignored", name);
6152 *no_add_attrs = true;
6158 /* Handle a "unused" attribute; arguments as in
6159 struct attribute_spec.handler. */
6162 handle_unused_attribute (tree *node, tree name, tree ARG_UNUSED (args),
6163 int flags, bool *no_add_attrs)
6169 if (TREE_CODE (decl) == PARM_DECL
6170 || TREE_CODE (decl) == VAR_DECL
6171 || TREE_CODE (decl) == FUNCTION_DECL
6172 || TREE_CODE (decl) == LABEL_DECL
6173 || TREE_CODE (decl) == TYPE_DECL)
6175 TREE_USED (decl) = 1;
6176 if (TREE_CODE (decl) == VAR_DECL
6177 || TREE_CODE (decl) == PARM_DECL)
6178 DECL_READ_P (decl) = 1;
6182 warning (OPT_Wattributes, "%qE attribute ignored", name);
6183 *no_add_attrs = true;
6188 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
6189 *node = build_variant_type_copy (*node);
6190 TREE_USED (*node) = 1;
6196 /* Handle a "externally_visible" attribute; arguments as in
6197 struct attribute_spec.handler. */
6200 handle_externally_visible_attribute (tree *pnode, tree name,
6201 tree ARG_UNUSED (args),
6202 int ARG_UNUSED (flags),
6207 if (TREE_CODE (node) == FUNCTION_DECL || TREE_CODE (node) == VAR_DECL)
6209 if ((!TREE_STATIC (node) && TREE_CODE (node) != FUNCTION_DECL
6210 && !DECL_EXTERNAL (node)) || !TREE_PUBLIC (node))
6212 warning (OPT_Wattributes,
6213 "%qE attribute have effect only on public objects", name);
6214 *no_add_attrs = true;
6219 warning (OPT_Wattributes, "%qE attribute ignored", name);
6220 *no_add_attrs = true;
6226 /* Handle a "const" attribute; arguments as in
6227 struct attribute_spec.handler. */
6230 handle_const_attribute (tree *node, tree name, tree ARG_UNUSED (args),
6231 int ARG_UNUSED (flags), bool *no_add_attrs)
6233 tree type = TREE_TYPE (*node);
6235 /* See FIXME comment on noreturn in c_common_attribute_table. */
6236 if (TREE_CODE (*node) == FUNCTION_DECL)
6237 TREE_READONLY (*node) = 1;
6238 else if (TREE_CODE (type) == POINTER_TYPE
6239 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
6241 = build_pointer_type
6242 (build_type_variant (TREE_TYPE (type), 1,
6243 TREE_THIS_VOLATILE (TREE_TYPE (type))));
6246 warning (OPT_Wattributes, "%qE attribute ignored", name);
6247 *no_add_attrs = true;
6253 /* Handle a "transparent_union" attribute; arguments as in
6254 struct attribute_spec.handler. */
6257 handle_transparent_union_attribute (tree *node, tree name,
6258 tree ARG_UNUSED (args), int flags,
6263 *no_add_attrs = true;
6265 if (TREE_CODE (*node) == TYPE_DECL)
6266 node = &TREE_TYPE (*node);
6269 if (TREE_CODE (type) == UNION_TYPE)
6271 /* When IN_PLACE is set, leave the check for FIELDS and MODE to
6272 the code in finish_struct. */
6273 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
6275 if (TYPE_FIELDS (type) == NULL_TREE
6276 || TYPE_MODE (type) != DECL_MODE (TYPE_FIELDS (type)))
6279 /* A type variant isn't good enough, since we don't a cast
6280 to such a type removed as a no-op. */
6281 *node = type = build_duplicate_type (type);
6284 TYPE_TRANSPARENT_AGGR (type) = 1;
6289 warning (OPT_Wattributes, "%qE attribute ignored", name);
6293 /* Subroutine of handle_{con,de}structor_attribute. Evaluate ARGS to
6294 get the requested priority for a constructor or destructor,
6295 possibly issuing diagnostics for invalid or reserved
6298 static priority_type
6299 get_priority (tree args, bool is_destructor)
6305 return DEFAULT_INIT_PRIORITY;
6307 if (!SUPPORTS_INIT_PRIORITY)
6310 error ("destructor priorities are not supported");
6312 error ("constructor priorities are not supported");
6313 return DEFAULT_INIT_PRIORITY;
6316 arg = TREE_VALUE (args);
6317 if (!host_integerp (arg, /*pos=*/0)
6318 || !INTEGRAL_TYPE_P (TREE_TYPE (arg)))
6321 pri = tree_low_cst (TREE_VALUE (args), /*pos=*/0);
6322 if (pri < 0 || pri > MAX_INIT_PRIORITY)
6325 if (pri <= MAX_RESERVED_INIT_PRIORITY)
6329 "destructor priorities from 0 to %d are reserved "
6330 "for the implementation",
6331 MAX_RESERVED_INIT_PRIORITY);
6334 "constructor priorities from 0 to %d are reserved "
6335 "for the implementation",
6336 MAX_RESERVED_INIT_PRIORITY);
6342 error ("destructor priorities must be integers from 0 to %d inclusive",
6345 error ("constructor priorities must be integers from 0 to %d inclusive",
6347 return DEFAULT_INIT_PRIORITY;
6350 /* Handle a "constructor" attribute; arguments as in
6351 struct attribute_spec.handler. */
6354 handle_constructor_attribute (tree *node, tree name, tree args,
6355 int ARG_UNUSED (flags),
6359 tree type = TREE_TYPE (decl);
6361 if (TREE_CODE (decl) == FUNCTION_DECL
6362 && TREE_CODE (type) == FUNCTION_TYPE
6363 && decl_function_context (decl) == 0)
6365 priority_type priority;
6366 DECL_STATIC_CONSTRUCTOR (decl) = 1;
6367 priority = get_priority (args, /*is_destructor=*/false);
6368 SET_DECL_INIT_PRIORITY (decl, priority);
6369 TREE_USED (decl) = 1;
6373 warning (OPT_Wattributes, "%qE attribute ignored", name);
6374 *no_add_attrs = true;
6380 /* Handle a "destructor" attribute; arguments as in
6381 struct attribute_spec.handler. */
6384 handle_destructor_attribute (tree *node, tree name, tree args,
6385 int ARG_UNUSED (flags),
6389 tree type = TREE_TYPE (decl);
6391 if (TREE_CODE (decl) == FUNCTION_DECL
6392 && TREE_CODE (type) == FUNCTION_TYPE
6393 && decl_function_context (decl) == 0)
6395 priority_type priority;
6396 DECL_STATIC_DESTRUCTOR (decl) = 1;
6397 priority = get_priority (args, /*is_destructor=*/true);
6398 SET_DECL_FINI_PRIORITY (decl, priority);
6399 TREE_USED (decl) = 1;
6403 warning (OPT_Wattributes, "%qE attribute ignored", name);
6404 *no_add_attrs = true;
6410 /* Handle a "mode" attribute; arguments as in
6411 struct attribute_spec.handler. */
6414 handle_mode_attribute (tree *node, tree name, tree args,
6415 int ARG_UNUSED (flags), bool *no_add_attrs)
6418 tree ident = TREE_VALUE (args);
6420 *no_add_attrs = true;
6422 if (TREE_CODE (ident) != IDENTIFIER_NODE)
6423 warning (OPT_Wattributes, "%qE attribute ignored", name);
6427 const char *p = IDENTIFIER_POINTER (ident);
6428 int len = strlen (p);
6429 enum machine_mode mode = VOIDmode;
6433 if (len > 4 && p[0] == '_' && p[1] == '_'
6434 && p[len - 1] == '_' && p[len - 2] == '_')
6436 char *newp = (char *) alloca (len - 1);
6438 strcpy (newp, &p[2]);
6439 newp[len - 4] = '\0';
6443 /* Change this type to have a type with the specified mode.
6444 First check for the special modes. */
6445 if (!strcmp (p, "byte"))
6447 else if (!strcmp (p, "word"))
6449 else if (!strcmp (p, "pointer"))
6451 else if (!strcmp (p, "libgcc_cmp_return"))
6452 mode = targetm.libgcc_cmp_return_mode ();
6453 else if (!strcmp (p, "libgcc_shift_count"))
6454 mode = targetm.libgcc_shift_count_mode ();
6455 else if (!strcmp (p, "unwind_word"))
6456 mode = targetm.unwind_word_mode ();
6458 for (j = 0; j < NUM_MACHINE_MODES; j++)
6459 if (!strcmp (p, GET_MODE_NAME (j)))
6461 mode = (enum machine_mode) j;
6465 if (mode == VOIDmode)
6467 error ("unknown machine mode %qE", ident);
6472 switch (GET_MODE_CLASS (mode))
6475 case MODE_PARTIAL_INT:
6477 case MODE_DECIMAL_FLOAT:
6482 valid_mode = targetm.scalar_mode_supported_p (mode);
6485 case MODE_COMPLEX_INT:
6486 case MODE_COMPLEX_FLOAT:
6487 valid_mode = targetm.scalar_mode_supported_p (GET_MODE_INNER (mode));
6490 case MODE_VECTOR_INT:
6491 case MODE_VECTOR_FLOAT:
6492 case MODE_VECTOR_FRACT:
6493 case MODE_VECTOR_UFRACT:
6494 case MODE_VECTOR_ACCUM:
6495 case MODE_VECTOR_UACCUM:
6496 warning (OPT_Wattributes, "specifying vector types with "
6497 "__attribute__ ((mode)) is deprecated");
6498 warning (OPT_Wattributes,
6499 "use __attribute__ ((vector_size)) instead");
6500 valid_mode = vector_mode_valid_p (mode);
6508 error ("unable to emulate %qs", p);
6512 if (POINTER_TYPE_P (type))
6514 addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (type));
6515 tree (*fn)(tree, enum machine_mode, bool);
6517 if (!targetm.addr_space.valid_pointer_mode (mode, as))
6519 error ("invalid pointer mode %qs", p);
6523 if (TREE_CODE (type) == POINTER_TYPE)
6524 fn = build_pointer_type_for_mode;
6526 fn = build_reference_type_for_mode;
6527 typefm = fn (TREE_TYPE (type), mode, false);
6531 /* For fixed-point modes, we need to test if the signness of type
6532 and the machine mode are consistent. */
6533 if (ALL_FIXED_POINT_MODE_P (mode)
6534 && TYPE_UNSIGNED (type) != UNSIGNED_FIXED_POINT_MODE_P (mode))
6536 error ("signness of type and machine mode %qs don't match", p);
6539 /* For fixed-point modes, we need to pass saturating info. */
6540 typefm = lang_hooks.types.type_for_mode (mode,
6541 ALL_FIXED_POINT_MODE_P (mode) ? TYPE_SATURATING (type)
6542 : TYPE_UNSIGNED (type));
6545 if (typefm == NULL_TREE)
6547 error ("no data type for mode %qs", p);
6550 else if (TREE_CODE (type) == ENUMERAL_TYPE)
6552 /* For enumeral types, copy the precision from the integer
6553 type returned above. If not an INTEGER_TYPE, we can't use
6554 this mode for this type. */
6555 if (TREE_CODE (typefm) != INTEGER_TYPE)
6557 error ("cannot use mode %qs for enumeral types", p);
6561 if (flags & ATTR_FLAG_TYPE_IN_PLACE)
6563 TYPE_PRECISION (type) = TYPE_PRECISION (typefm);
6568 /* We cannot build a type variant, as there's code that assumes
6569 that TYPE_MAIN_VARIANT has the same mode. This includes the
6570 debug generators. Instead, create a subrange type. This
6571 results in all of the enumeral values being emitted only once
6572 in the original, and the subtype gets them by reference. */
6573 if (TYPE_UNSIGNED (type))
6574 typefm = make_unsigned_type (TYPE_PRECISION (typefm));
6576 typefm = make_signed_type (TYPE_PRECISION (typefm));
6577 TREE_TYPE (typefm) = type;
6580 else if (VECTOR_MODE_P (mode)
6581 ? TREE_CODE (type) != TREE_CODE (TREE_TYPE (typefm))
6582 : TREE_CODE (type) != TREE_CODE (typefm))
6584 error ("mode %qs applied to inappropriate type", p);
6594 /* Handle a "section" attribute; arguments as in
6595 struct attribute_spec.handler. */
6598 handle_section_attribute (tree *node, tree ARG_UNUSED (name), tree args,
6599 int ARG_UNUSED (flags), bool *no_add_attrs)
6603 if (targetm.have_named_sections)
6605 user_defined_section_attribute = true;
6607 if ((TREE_CODE (decl) == FUNCTION_DECL
6608 || TREE_CODE (decl) == VAR_DECL)
6609 && TREE_CODE (TREE_VALUE (args)) == STRING_CST)
6611 if (TREE_CODE (decl) == VAR_DECL
6612 && current_function_decl != NULL_TREE
6613 && !TREE_STATIC (decl))
6615 error_at (DECL_SOURCE_LOCATION (decl),
6616 "section attribute cannot be specified for "
6618 *no_add_attrs = true;
6621 /* The decl may have already been given a section attribute
6622 from a previous declaration. Ensure they match. */
6623 else if (DECL_SECTION_NAME (decl) != NULL_TREE
6624 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
6625 TREE_STRING_POINTER (TREE_VALUE (args))) != 0)
6627 error ("section of %q+D conflicts with previous declaration",
6629 *no_add_attrs = true;
6631 else if (TREE_CODE (decl) == VAR_DECL
6632 && !targetm.have_tls && targetm.emutls.tmpl_section
6633 && DECL_THREAD_LOCAL_P (decl))
6635 error ("section of %q+D cannot be overridden", *node);
6636 *no_add_attrs = true;
6639 DECL_SECTION_NAME (decl) = TREE_VALUE (args);
6643 error ("section attribute not allowed for %q+D", *node);
6644 *no_add_attrs = true;
6649 error_at (DECL_SOURCE_LOCATION (*node),
6650 "section attributes are not supported for this target");
6651 *no_add_attrs = true;
6657 /* Handle a "aligned" attribute; arguments as in
6658 struct attribute_spec.handler. */
6661 handle_aligned_attribute (tree *node, tree ARG_UNUSED (name), tree args,
6662 int flags, bool *no_add_attrs)
6664 tree decl = NULL_TREE;
6667 tree align_expr = (args ? TREE_VALUE (args)
6668 : size_int (ATTRIBUTE_ALIGNED_VALUE / BITS_PER_UNIT));
6674 type = &TREE_TYPE (decl);
6675 is_type = TREE_CODE (*node) == TYPE_DECL;
6677 else if (TYPE_P (*node))
6678 type = node, is_type = 1;
6680 if (TREE_CODE (align_expr) != INTEGER_CST)
6682 error ("requested alignment is not a constant");
6683 *no_add_attrs = true;
6685 else if ((i = tree_log2 (align_expr)) == -1)
6687 error ("requested alignment is not a power of 2");
6688 *no_add_attrs = true;
6690 else if (i >= HOST_BITS_PER_INT - BITS_PER_UNIT_LOG)
6692 error ("requested alignment is too large");
6693 *no_add_attrs = true;
6697 if ((flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
6698 /* OK, modify the type in place. */;
6699 /* If we have a TYPE_DECL, then copy the type, so that we
6700 don't accidentally modify a builtin type. See pushdecl. */
6701 else if (decl && TREE_TYPE (decl) != error_mark_node
6702 && DECL_ORIGINAL_TYPE (decl) == NULL_TREE)
6704 tree tt = TREE_TYPE (decl);
6705 *type = build_variant_type_copy (*type);
6706 DECL_ORIGINAL_TYPE (decl) = tt;
6707 TYPE_NAME (*type) = decl;
6708 TREE_USED (*type) = TREE_USED (decl);
6709 TREE_TYPE (decl) = *type;
6712 *type = build_variant_type_copy (*type);
6714 TYPE_ALIGN (*type) = (1U << i) * BITS_PER_UNIT;
6715 TYPE_USER_ALIGN (*type) = 1;
6717 else if (! VAR_OR_FUNCTION_DECL_P (decl)
6718 && TREE_CODE (decl) != FIELD_DECL)
6720 error ("alignment may not be specified for %q+D", decl);
6721 *no_add_attrs = true;
6723 else if (TREE_CODE (decl) == FUNCTION_DECL
6724 && DECL_ALIGN (decl) > (1U << i) * BITS_PER_UNIT)
6726 if (DECL_USER_ALIGN (decl))
6727 error ("alignment for %q+D was previously specified as %d "
6728 "and may not be decreased", decl,
6729 DECL_ALIGN (decl) / BITS_PER_UNIT);
6731 error ("alignment for %q+D must be at least %d", decl,
6732 DECL_ALIGN (decl) / BITS_PER_UNIT);
6733 *no_add_attrs = true;
6737 DECL_ALIGN (decl) = (1U << i) * BITS_PER_UNIT;
6738 DECL_USER_ALIGN (decl) = 1;
6744 /* Handle a "weak" attribute; arguments as in
6745 struct attribute_spec.handler. */
6748 handle_weak_attribute (tree *node, tree name,
6749 tree ARG_UNUSED (args),
6750 int ARG_UNUSED (flags),
6751 bool * ARG_UNUSED (no_add_attrs))
6753 if (TREE_CODE (*node) == FUNCTION_DECL
6754 && DECL_DECLARED_INLINE_P (*node))
6756 error ("inline function %q+D cannot be declared weak", *node);
6757 *no_add_attrs = true;
6759 else if (TREE_CODE (*node) == FUNCTION_DECL
6760 || TREE_CODE (*node) == VAR_DECL)
6761 declare_weak (*node);
6763 warning (OPT_Wattributes, "%qE attribute ignored", name);
6768 /* Handle an "alias" attribute; arguments as in
6769 struct attribute_spec.handler. */
6772 handle_alias_attribute (tree *node, tree name, tree args,
6773 int ARG_UNUSED (flags), bool *no_add_attrs)
6777 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
6779 warning (OPT_Wattributes, "%qE attribute ignored", name);
6780 *no_add_attrs = true;
6782 else if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
6783 || (TREE_CODE (decl) != FUNCTION_DECL
6784 && TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl))
6785 /* A static variable declaration is always a tentative definition,
6786 but the alias is a non-tentative definition which overrides. */
6787 || (TREE_CODE (decl) != FUNCTION_DECL
6788 && ! TREE_PUBLIC (decl) && DECL_INITIAL (decl)))
6790 error ("%q+D defined both normally and as an alias", decl);
6791 *no_add_attrs = true;
6794 /* Note that the very first time we process a nested declaration,
6795 decl_function_context will not be set. Indeed, *would* never
6796 be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that
6797 we do below. After such frobbery, pushdecl would set the context.
6798 In any case, this is never what we want. */
6799 else if (decl_function_context (decl) == 0 && current_function_decl == NULL)
6803 id = TREE_VALUE (args);
6804 if (TREE_CODE (id) != STRING_CST)
6806 error ("alias argument not a string");
6807 *no_add_attrs = true;
6810 id = get_identifier (TREE_STRING_POINTER (id));
6811 /* This counts as a use of the object pointed to. */
6814 if (TREE_CODE (decl) == FUNCTION_DECL)
6815 DECL_INITIAL (decl) = error_mark_node;
6818 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
6819 DECL_EXTERNAL (decl) = 1;
6821 DECL_EXTERNAL (decl) = 0;
6822 TREE_STATIC (decl) = 1;
6827 warning (OPT_Wattributes, "%qE attribute ignored", name);
6828 *no_add_attrs = true;
6834 /* Handle a "weakref" attribute; arguments as in struct
6835 attribute_spec.handler. */
6838 handle_weakref_attribute (tree *node, tree ARG_UNUSED (name), tree args,
6839 int flags, bool *no_add_attrs)
6841 tree attr = NULL_TREE;
6843 /* We must ignore the attribute when it is associated with
6844 local-scoped decls, since attribute alias is ignored and many
6845 such symbols do not even have a DECL_WEAK field. */
6846 if (decl_function_context (*node)
6847 || current_function_decl
6848 || (TREE_CODE (*node) != VAR_DECL && TREE_CODE (*node) != FUNCTION_DECL))
6850 warning (OPT_Wattributes, "%qE attribute ignored", name);
6851 *no_add_attrs = true;
6855 /* The idea here is that `weakref("name")' mutates into `weakref,
6856 alias("name")', and weakref without arguments, in turn,
6857 implicitly adds weak. */
6861 attr = tree_cons (get_identifier ("alias"), args, attr);
6862 attr = tree_cons (get_identifier ("weakref"), NULL_TREE, attr);
6864 *no_add_attrs = true;
6866 decl_attributes (node, attr, flags);
6870 if (lookup_attribute ("alias", DECL_ATTRIBUTES (*node)))
6871 error_at (DECL_SOURCE_LOCATION (*node),
6872 "weakref attribute must appear before alias attribute");
6874 /* Can't call declare_weak because it wants this to be TREE_PUBLIC,
6875 and that isn't supported; and because it wants to add it to
6876 the list of weak decls, which isn't helpful. */
6877 DECL_WEAK (*node) = 1;
6883 /* Handle an "visibility" attribute; arguments as in
6884 struct attribute_spec.handler. */
6887 handle_visibility_attribute (tree *node, tree name, tree args,
6888 int ARG_UNUSED (flags),
6889 bool *ARG_UNUSED (no_add_attrs))
6892 tree id = TREE_VALUE (args);
6893 enum symbol_visibility vis;
6897 if (TREE_CODE (*node) == ENUMERAL_TYPE)
6899 else if (TREE_CODE (*node) != RECORD_TYPE && TREE_CODE (*node) != UNION_TYPE)
6901 warning (OPT_Wattributes, "%qE attribute ignored on non-class types",
6905 else if (TYPE_FIELDS (*node))
6907 error ("%qE attribute ignored because %qT is already defined",
6912 else if (decl_function_context (decl) != 0 || !TREE_PUBLIC (decl))
6914 warning (OPT_Wattributes, "%qE attribute ignored", name);
6918 if (TREE_CODE (id) != STRING_CST)
6920 error ("visibility argument not a string");
6924 /* If this is a type, set the visibility on the type decl. */
6927 decl = TYPE_NAME (decl);
6930 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6932 warning (OPT_Wattributes, "%qE attribute ignored on types",
6938 if (strcmp (TREE_STRING_POINTER (id), "default") == 0)
6939 vis = VISIBILITY_DEFAULT;
6940 else if (strcmp (TREE_STRING_POINTER (id), "internal") == 0)
6941 vis = VISIBILITY_INTERNAL;
6942 else if (strcmp (TREE_STRING_POINTER (id), "hidden") == 0)
6943 vis = VISIBILITY_HIDDEN;
6944 else if (strcmp (TREE_STRING_POINTER (id), "protected") == 0)
6945 vis = VISIBILITY_PROTECTED;
6948 error ("visibility argument must be one of \"default\", \"hidden\", \"protected\" or \"internal\"");
6949 vis = VISIBILITY_DEFAULT;
6952 if (DECL_VISIBILITY_SPECIFIED (decl)
6953 && vis != DECL_VISIBILITY (decl))
6955 tree attributes = (TYPE_P (*node)
6956 ? TYPE_ATTRIBUTES (*node)
6957 : DECL_ATTRIBUTES (decl));
6958 if (lookup_attribute ("visibility", attributes))
6959 error ("%qD redeclared with different visibility", decl);
6960 else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
6961 && lookup_attribute ("dllimport", attributes))
6962 error ("%qD was declared %qs which implies default visibility",
6964 else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
6965 && lookup_attribute ("dllexport", attributes))
6966 error ("%qD was declared %qs which implies default visibility",
6970 DECL_VISIBILITY (decl) = vis;
6971 DECL_VISIBILITY_SPECIFIED (decl) = 1;
6973 /* Go ahead and attach the attribute to the node as well. This is needed
6974 so we can determine whether we have VISIBILITY_DEFAULT because the
6975 visibility was not specified, or because it was explicitly overridden
6976 from the containing scope. */
6981 /* Determine the ELF symbol visibility for DECL, which is either a
6982 variable or a function. It is an error to use this function if a
6983 definition of DECL is not available in this translation unit.
6984 Returns true if the final visibility has been determined by this
6985 function; false if the caller is free to make additional
6989 c_determine_visibility (tree decl)
6991 gcc_assert (TREE_CODE (decl) == VAR_DECL
6992 || TREE_CODE (decl) == FUNCTION_DECL);
6994 /* If the user explicitly specified the visibility with an
6995 attribute, honor that. DECL_VISIBILITY will have been set during
6996 the processing of the attribute. We check for an explicit
6997 attribute, rather than just checking DECL_VISIBILITY_SPECIFIED,
6998 to distinguish the use of an attribute from the use of a "#pragma
6999 GCC visibility push(...)"; in the latter case we still want other
7000 considerations to be able to overrule the #pragma. */
7001 if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl))
7002 || (TARGET_DLLIMPORT_DECL_ATTRIBUTES
7003 && (lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl))
7004 || lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))))
7007 /* Set default visibility to whatever the user supplied with
7008 visibility_specified depending on #pragma GCC visibility. */
7009 if (!DECL_VISIBILITY_SPECIFIED (decl))
7011 if (visibility_options.inpragma
7012 || DECL_VISIBILITY (decl) != default_visibility)
7014 DECL_VISIBILITY (decl) = default_visibility;
7015 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
7016 /* If visibility changed and DECL already has DECL_RTL, ensure
7017 symbol flags are updated. */
7018 if (((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
7019 || TREE_CODE (decl) == FUNCTION_DECL)
7020 && DECL_RTL_SET_P (decl))
7021 make_decl_rtl (decl);
7027 /* Handle an "tls_model" attribute; arguments as in
7028 struct attribute_spec.handler. */
7031 handle_tls_model_attribute (tree *node, tree name, tree args,
7032 int ARG_UNUSED (flags), bool *no_add_attrs)
7036 enum tls_model kind;
7038 *no_add_attrs = true;
7040 if (TREE_CODE (decl) != VAR_DECL || !DECL_THREAD_LOCAL_P (decl))
7042 warning (OPT_Wattributes, "%qE attribute ignored", name);
7046 kind = DECL_TLS_MODEL (decl);
7047 id = TREE_VALUE (args);
7048 if (TREE_CODE (id) != STRING_CST)
7050 error ("tls_model argument not a string");
7054 if (!strcmp (TREE_STRING_POINTER (id), "local-exec"))
7055 kind = TLS_MODEL_LOCAL_EXEC;
7056 else if (!strcmp (TREE_STRING_POINTER (id), "initial-exec"))
7057 kind = TLS_MODEL_INITIAL_EXEC;
7058 else if (!strcmp (TREE_STRING_POINTER (id), "local-dynamic"))
7059 kind = optimize ? TLS_MODEL_LOCAL_DYNAMIC : TLS_MODEL_GLOBAL_DYNAMIC;
7060 else if (!strcmp (TREE_STRING_POINTER (id), "global-dynamic"))
7061 kind = TLS_MODEL_GLOBAL_DYNAMIC;
7063 error ("tls_model argument must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\"");
7065 DECL_TLS_MODEL (decl) = kind;
7069 /* Handle a "no_instrument_function" attribute; arguments as in
7070 struct attribute_spec.handler. */
7073 handle_no_instrument_function_attribute (tree *node, tree name,
7074 tree ARG_UNUSED (args),
7075 int ARG_UNUSED (flags),
7080 if (TREE_CODE (decl) != FUNCTION_DECL)
7082 error_at (DECL_SOURCE_LOCATION (decl),
7083 "%qE attribute applies only to functions", name);
7084 *no_add_attrs = true;
7086 else if (DECL_INITIAL (decl))
7088 error_at (DECL_SOURCE_LOCATION (decl),
7089 "can%'t set %qE attribute after definition", name);
7090 *no_add_attrs = true;
7093 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1;
7098 /* Handle a "malloc" attribute; arguments as in
7099 struct attribute_spec.handler. */
7102 handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args),
7103 int ARG_UNUSED (flags), bool *no_add_attrs)
7105 if (TREE_CODE (*node) == FUNCTION_DECL
7106 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node))))
7107 DECL_IS_MALLOC (*node) = 1;
7110 warning (OPT_Wattributes, "%qE attribute ignored", name);
7111 *no_add_attrs = true;
7117 /* Handle a "alloc_size" attribute; arguments as in
7118 struct attribute_spec.handler. */
7121 handle_alloc_size_attribute (tree *node, tree ARG_UNUSED (name), tree args,
7122 int ARG_UNUSED (flags), bool *no_add_attrs)
7124 unsigned arg_count = type_num_arguments (*node);
7125 for (; args; args = TREE_CHAIN (args))
7127 tree position = TREE_VALUE (args);
7129 if (TREE_CODE (position) != INTEGER_CST
7130 || TREE_INT_CST_HIGH (position)
7131 || TREE_INT_CST_LOW (position) < 1
7132 || TREE_INT_CST_LOW (position) > arg_count )
7134 warning (OPT_Wattributes,
7135 "alloc_size parameter outside range");
7136 *no_add_attrs = true;
7143 /* Handle a "fn spec" attribute; arguments as in
7144 struct attribute_spec.handler. */
7147 handle_fnspec_attribute (tree *node ATTRIBUTE_UNUSED, tree ARG_UNUSED (name),
7148 tree args, int ARG_UNUSED (flags),
7149 bool *no_add_attrs ATTRIBUTE_UNUSED)
7152 && TREE_CODE (TREE_VALUE (args)) == STRING_CST
7153 && !TREE_CHAIN (args));
7157 /* Handle a "returns_twice" attribute; arguments as in
7158 struct attribute_spec.handler. */
7161 handle_returns_twice_attribute (tree *node, tree name, tree ARG_UNUSED (args),
7162 int ARG_UNUSED (flags), bool *no_add_attrs)
7164 if (TREE_CODE (*node) == FUNCTION_DECL)
7165 DECL_IS_RETURNS_TWICE (*node) = 1;
7168 warning (OPT_Wattributes, "%qE attribute ignored", name);
7169 *no_add_attrs = true;
7175 /* Handle a "no_limit_stack" attribute; arguments as in
7176 struct attribute_spec.handler. */
7179 handle_no_limit_stack_attribute (tree *node, tree name,
7180 tree ARG_UNUSED (args),
7181 int ARG_UNUSED (flags),
7186 if (TREE_CODE (decl) != FUNCTION_DECL)
7188 error_at (DECL_SOURCE_LOCATION (decl),
7189 "%qE attribute applies only to functions", name);
7190 *no_add_attrs = true;
7192 else if (DECL_INITIAL (decl))
7194 error_at (DECL_SOURCE_LOCATION (decl),
7195 "can%'t set %qE attribute after definition", name);
7196 *no_add_attrs = true;
7199 DECL_NO_LIMIT_STACK (decl) = 1;
7204 /* Handle a "pure" attribute; arguments as in
7205 struct attribute_spec.handler. */
7208 handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args),
7209 int ARG_UNUSED (flags), bool *no_add_attrs)
7211 if (TREE_CODE (*node) == FUNCTION_DECL)
7212 DECL_PURE_P (*node) = 1;
7213 /* ??? TODO: Support types. */
7216 warning (OPT_Wattributes, "%qE attribute ignored", name);
7217 *no_add_attrs = true;
7223 /* Handle a "no vops" attribute; arguments as in
7224 struct attribute_spec.handler. */
7227 handle_novops_attribute (tree *node, tree ARG_UNUSED (name),
7228 tree ARG_UNUSED (args), int ARG_UNUSED (flags),
7229 bool *ARG_UNUSED (no_add_attrs))
7231 gcc_assert (TREE_CODE (*node) == FUNCTION_DECL);
7232 DECL_IS_NOVOPS (*node) = 1;
7236 /* Handle a "deprecated" attribute; arguments as in
7237 struct attribute_spec.handler. */
7240 handle_deprecated_attribute (tree *node, tree name,
7241 tree args, int flags,
7244 tree type = NULL_TREE;
7246 tree what = NULL_TREE;
7249 *no_add_attrs = true;
7250 else if (TREE_CODE (TREE_VALUE (args)) != STRING_CST)
7252 error ("deprecated message is not a string");
7253 *no_add_attrs = true;
7259 type = TREE_TYPE (decl);
7261 if (TREE_CODE (decl) == TYPE_DECL
7262 || TREE_CODE (decl) == PARM_DECL
7263 || TREE_CODE (decl) == VAR_DECL
7264 || TREE_CODE (decl) == FUNCTION_DECL
7265 || TREE_CODE (decl) == FIELD_DECL)
7266 TREE_DEPRECATED (decl) = 1;
7270 else if (TYPE_P (*node))
7272 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
7273 *node = build_variant_type_copy (*node);
7274 TREE_DEPRECATED (*node) = 1;
7282 *no_add_attrs = true;
7283 if (type && TYPE_NAME (type))
7285 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
7286 what = TYPE_NAME (*node);
7287 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
7288 && DECL_NAME (TYPE_NAME (type)))
7289 what = DECL_NAME (TYPE_NAME (type));
7292 warning (OPT_Wattributes, "%qE attribute ignored for %qE", name, what);
7294 warning (OPT_Wattributes, "%qE attribute ignored", name);
7300 /* Handle a "vector_size" attribute; arguments as in
7301 struct attribute_spec.handler. */
7304 handle_vector_size_attribute (tree *node, tree name, tree args,
7305 int ARG_UNUSED (flags),
7308 unsigned HOST_WIDE_INT vecsize, nunits;
7309 enum machine_mode orig_mode;
7310 tree type = *node, new_type, size;
7312 *no_add_attrs = true;
7314 size = TREE_VALUE (args);
7316 if (!host_integerp (size, 1))
7318 warning (OPT_Wattributes, "%qE attribute ignored", name);
7322 /* Get the vector size (in bytes). */
7323 vecsize = tree_low_cst (size, 1);
7325 /* We need to provide for vector pointers, vector arrays, and
7326 functions returning vectors. For example:
7328 __attribute__((vector_size(16))) short *foo;
7330 In this case, the mode is SI, but the type being modified is
7331 HI, so we need to look further. */
7333 while (POINTER_TYPE_P (type)
7334 || TREE_CODE (type) == FUNCTION_TYPE
7335 || TREE_CODE (type) == METHOD_TYPE
7336 || TREE_CODE (type) == ARRAY_TYPE
7337 || TREE_CODE (type) == OFFSET_TYPE)
7338 type = TREE_TYPE (type);
7340 /* Get the mode of the type being modified. */
7341 orig_mode = TYPE_MODE (type);
7343 if ((!INTEGRAL_TYPE_P (type)
7344 && !SCALAR_FLOAT_TYPE_P (type)
7345 && !FIXED_POINT_TYPE_P (type))
7346 || (!SCALAR_FLOAT_MODE_P (orig_mode)
7347 && GET_MODE_CLASS (orig_mode) != MODE_INT
7348 && !ALL_SCALAR_FIXED_POINT_MODE_P (orig_mode))
7349 || !host_integerp (TYPE_SIZE_UNIT (type), 1)
7350 || TREE_CODE (type) == BOOLEAN_TYPE)
7352 error ("invalid vector type for attribute %qE", name);
7356 if (vecsize % tree_low_cst (TYPE_SIZE_UNIT (type), 1))
7358 error ("vector size not an integral multiple of component size");
7364 error ("zero vector size");
7368 /* Calculate how many units fit in the vector. */
7369 nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1);
7370 if (nunits & (nunits - 1))
7372 error ("number of components of the vector not a power of two");
7376 new_type = build_vector_type (type, nunits);
7378 /* Build back pointers if needed. */
7379 *node = lang_hooks.types.reconstruct_complex_type (*node, new_type);
7384 /* Handle the "nonnull" attribute. */
7386 handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name),
7387 tree args, int ARG_UNUSED (flags),
7391 unsigned HOST_WIDE_INT attr_arg_num;
7393 /* If no arguments are specified, all pointer arguments should be
7394 non-null. Verify a full prototype is given so that the arguments
7395 will have the correct types when we actually check them later. */
7398 if (!TYPE_ARG_TYPES (type))
7400 error ("nonnull attribute without arguments on a non-prototype");
7401 *no_add_attrs = true;
7406 /* Argument list specified. Verify that each argument number references
7407 a pointer argument. */
7408 for (attr_arg_num = 1; args; args = TREE_CHAIN (args))
7411 unsigned HOST_WIDE_INT arg_num = 0, ck_num;
7413 if (!get_nonnull_operand (TREE_VALUE (args), &arg_num))
7415 error ("nonnull argument has invalid operand number (argument %lu)",
7416 (unsigned long) attr_arg_num);
7417 *no_add_attrs = true;
7421 argument = TYPE_ARG_TYPES (type);
7424 for (ck_num = 1; ; ck_num++)
7426 if (!argument || ck_num == arg_num)
7428 argument = TREE_CHAIN (argument);
7432 || TREE_CODE (TREE_VALUE (argument)) == VOID_TYPE)
7434 error ("nonnull argument with out-of-range operand number (argument %lu, operand %lu)",
7435 (unsigned long) attr_arg_num, (unsigned long) arg_num);
7436 *no_add_attrs = true;
7440 if (TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE)
7442 error ("nonnull argument references non-pointer operand (argument %lu, operand %lu)",
7443 (unsigned long) attr_arg_num, (unsigned long) arg_num);
7444 *no_add_attrs = true;
7453 /* Check the argument list of a function call for null in argument slots
7454 that are marked as requiring a non-null pointer argument. The NARGS
7455 arguments are passed in the array ARGARRAY.
7459 check_function_nonnull (tree attrs, int nargs, tree *argarray)
7464 for (a = attrs; a; a = TREE_CHAIN (a))
7466 if (is_attribute_p ("nonnull", TREE_PURPOSE (a)))
7468 args = TREE_VALUE (a);
7470 /* Walk the argument list. If we encounter an argument number we
7471 should check for non-null, do it. If the attribute has no args,
7472 then every pointer argument is checked (in which case the check
7473 for pointer type is done in check_nonnull_arg). */
7474 for (i = 0; i < nargs; i++)
7476 if (!args || nonnull_check_p (args, i + 1))
7477 check_function_arguments_recurse (check_nonnull_arg, NULL,
7485 /* Check that the Nth argument of a function call (counting backwards
7486 from the end) is a (pointer)0. The NARGS arguments are passed in the
7490 check_function_sentinel (tree attrs, int nargs, tree *argarray, tree typelist)
7492 tree attr = lookup_attribute ("sentinel", attrs);
7500 /* Skip over the named arguments. */
7501 while (typelist && len < nargs)
7503 typelist = TREE_CHAIN (typelist);
7507 if (TREE_VALUE (attr))
7509 tree p = TREE_VALUE (TREE_VALUE (attr));
7510 pos = TREE_INT_CST_LOW (p);
7513 /* The sentinel must be one of the varargs, i.e.
7514 in position >= the number of fixed arguments. */
7515 if ((nargs - 1 - pos) < len)
7517 warning (OPT_Wformat,
7518 "not enough variable arguments to fit a sentinel");
7522 /* Validate the sentinel. */
7523 sentinel = argarray[nargs - 1 - pos];
7524 if ((!POINTER_TYPE_P (TREE_TYPE (sentinel))
7525 || !integer_zerop (sentinel))
7526 /* Although __null (in C++) is only an integer we allow it
7527 nevertheless, as we are guaranteed that it's exactly
7528 as wide as a pointer, and we don't want to force
7529 users to cast the NULL they have written there.
7530 We warn with -Wstrict-null-sentinel, though. */
7531 && (warn_strict_null_sentinel || null_node != sentinel))
7532 warning (OPT_Wformat, "missing sentinel in function call");
7536 /* Helper for check_function_nonnull; given a list of operands which
7537 must be non-null in ARGS, determine if operand PARAM_NUM should be
7541 nonnull_check_p (tree args, unsigned HOST_WIDE_INT param_num)
7543 unsigned HOST_WIDE_INT arg_num = 0;
7545 for (; args; args = TREE_CHAIN (args))
7547 bool found = get_nonnull_operand (TREE_VALUE (args), &arg_num);
7551 if (arg_num == param_num)
7557 /* Check that the function argument PARAM (which is operand number
7558 PARAM_NUM) is non-null. This is called by check_function_nonnull
7559 via check_function_arguments_recurse. */
7562 check_nonnull_arg (void * ARG_UNUSED (ctx), tree param,
7563 unsigned HOST_WIDE_INT param_num)
7565 /* Just skip checking the argument if it's not a pointer. This can
7566 happen if the "nonnull" attribute was given without an operand
7567 list (which means to check every pointer argument). */
7569 if (TREE_CODE (TREE_TYPE (param)) != POINTER_TYPE)
7572 if (integer_zerop (param))
7573 warning (OPT_Wnonnull, "null argument where non-null required "
7574 "(argument %lu)", (unsigned long) param_num);
7577 /* Helper for nonnull attribute handling; fetch the operand number
7578 from the attribute argument list. */
7581 get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp)
7583 /* Verify the arg number is a constant. */
7584 if (TREE_CODE (arg_num_expr) != INTEGER_CST
7585 || TREE_INT_CST_HIGH (arg_num_expr) != 0)
7588 *valp = TREE_INT_CST_LOW (arg_num_expr);
7592 /* Handle a "nothrow" attribute; arguments as in
7593 struct attribute_spec.handler. */
7596 handle_nothrow_attribute (tree *node, tree name, tree ARG_UNUSED (args),
7597 int ARG_UNUSED (flags), bool *no_add_attrs)
7599 if (TREE_CODE (*node) == FUNCTION_DECL)
7600 TREE_NOTHROW (*node) = 1;
7601 /* ??? TODO: Support types. */
7604 warning (OPT_Wattributes, "%qE attribute ignored", name);
7605 *no_add_attrs = true;
7611 /* Handle a "cleanup" attribute; arguments as in
7612 struct attribute_spec.handler. */
7615 handle_cleanup_attribute (tree *node, tree name, tree args,
7616 int ARG_UNUSED (flags), bool *no_add_attrs)
7619 tree cleanup_id, cleanup_decl;
7621 /* ??? Could perhaps support cleanups on TREE_STATIC, much like we do
7622 for global destructors in C++. This requires infrastructure that
7623 we don't have generically at the moment. It's also not a feature
7624 we'd be missing too much, since we do have attribute constructor. */
7625 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl))
7627 warning (OPT_Wattributes, "%qE attribute ignored", name);
7628 *no_add_attrs = true;
7632 /* Verify that the argument is a function in scope. */
7633 /* ??? We could support pointers to functions here as well, if
7634 that was considered desirable. */
7635 cleanup_id = TREE_VALUE (args);
7636 if (TREE_CODE (cleanup_id) != IDENTIFIER_NODE)
7638 error ("cleanup argument not an identifier");
7639 *no_add_attrs = true;
7642 cleanup_decl = lookup_name (cleanup_id);
7643 if (!cleanup_decl || TREE_CODE (cleanup_decl) != FUNCTION_DECL)
7645 error ("cleanup argument not a function");
7646 *no_add_attrs = true;
7650 /* That the function has proper type is checked with the
7651 eventual call to build_function_call. */
7656 /* Handle a "warn_unused_result" attribute. No special handling. */
7659 handle_warn_unused_result_attribute (tree *node, tree name,
7660 tree ARG_UNUSED (args),
7661 int ARG_UNUSED (flags), bool *no_add_attrs)
7663 /* Ignore the attribute for functions not returning any value. */
7664 if (VOID_TYPE_P (TREE_TYPE (*node)))
7666 warning (OPT_Wattributes, "%qE attribute ignored", name);
7667 *no_add_attrs = true;
7673 /* Handle a "sentinel" attribute. */
7676 handle_sentinel_attribute (tree *node, tree name, tree args,
7677 int ARG_UNUSED (flags), bool *no_add_attrs)
7679 tree params = TYPE_ARG_TYPES (*node);
7683 warning (OPT_Wattributes,
7684 "%qE attribute requires prototypes with named arguments", name);
7685 *no_add_attrs = true;
7689 while (TREE_CHAIN (params))
7690 params = TREE_CHAIN (params);
7692 if (VOID_TYPE_P (TREE_VALUE (params)))
7694 warning (OPT_Wattributes,
7695 "%qE attribute only applies to variadic functions", name);
7696 *no_add_attrs = true;
7702 tree position = TREE_VALUE (args);
7704 if (TREE_CODE (position) != INTEGER_CST)
7706 warning (OPT_Wattributes,
7707 "requested position is not an integer constant");
7708 *no_add_attrs = true;
7712 if (tree_int_cst_lt (position, integer_zero_node))
7714 warning (OPT_Wattributes,
7715 "requested position is less than zero");
7716 *no_add_attrs = true;
7724 /* Handle a "type_generic" attribute. */
7727 handle_type_generic_attribute (tree *node, tree ARG_UNUSED (name),
7728 tree ARG_UNUSED (args), int ARG_UNUSED (flags),
7729 bool * ARG_UNUSED (no_add_attrs))
7733 /* Ensure we have a function type. */
7734 gcc_assert (TREE_CODE (*node) == FUNCTION_TYPE);
7736 params = TYPE_ARG_TYPES (*node);
7737 while (params && ! VOID_TYPE_P (TREE_VALUE (params)))
7738 params = TREE_CHAIN (params);
7740 /* Ensure we have a variadic function. */
7741 gcc_assert (!params);
7746 /* Handle a "target" attribute. */
7749 handle_target_attribute (tree *node, tree name, tree args, int flags,
7752 /* Ensure we have a function type. */
7753 if (TREE_CODE (*node) != FUNCTION_DECL)
7755 warning (OPT_Wattributes, "%qE attribute ignored", name);
7756 *no_add_attrs = true;
7758 else if (! targetm.target_option.valid_attribute_p (*node, name, args,
7760 *no_add_attrs = true;
7765 /* Arguments being collected for optimization. */
7766 typedef const char *const_char_p; /* For DEF_VEC_P. */
7767 DEF_VEC_P(const_char_p);
7768 DEF_VEC_ALLOC_P(const_char_p, gc);
7769 static GTY(()) VEC(const_char_p, gc) *optimize_args;
7772 /* Inner function to convert a TREE_LIST to argv string to parse the optimize
7773 options in ARGS. ATTR_P is true if this is for attribute(optimize), and
7774 false for #pragma GCC optimize. */
7777 parse_optimize_options (tree args, bool attr_p)
7782 int saved_flag_strict_aliasing;
7783 const char **opt_argv;
7786 /* Build up argv vector. Just in case the string is stored away, use garbage
7787 collected strings. */
7788 VEC_truncate (const_char_p, optimize_args, 0);
7789 VEC_safe_push (const_char_p, gc, optimize_args, NULL);
7791 for (ap = args; ap != NULL_TREE; ap = TREE_CHAIN (ap))
7793 tree value = TREE_VALUE (ap);
7795 if (TREE_CODE (value) == INTEGER_CST)
7798 sprintf (buffer, "-O%ld", (long) TREE_INT_CST_LOW (value));
7799 VEC_safe_push (const_char_p, gc, optimize_args, ggc_strdup (buffer));
7802 else if (TREE_CODE (value) == STRING_CST)
7804 /* Split string into multiple substrings. */
7805 size_t len = TREE_STRING_LENGTH (value);
7806 char *p = ASTRDUP (TREE_STRING_POINTER (value));
7807 char *end = p + len;
7811 while (next_p != NULL)
7817 comma = strchr (p, ',');
7830 r = q = (char *) ggc_alloc (len2 + 3);
7832 /* If the user supplied -Oxxx or -fxxx, only allow -Oxxx or -fxxx
7834 if (*p == '-' && p[1] != 'O' && p[1] != 'f')
7838 warning (OPT_Wattributes,
7839 "Bad option %s to optimize attribute.", p);
7841 warning (OPT_Wpragmas,
7842 "Bad option %s to pragma attribute", p);
7850 /* Assume that Ox is -Ox, a numeric value is -Ox, a s by
7851 itself is -Os, and any other switch begins with a -f. */
7852 if ((*p >= '0' && *p <= '9')
7853 || (p[0] == 's' && p[1] == '\0'))
7859 memcpy (r, p, len2);
7861 VEC_safe_push (const_char_p, gc, optimize_args, q);
7867 opt_argc = VEC_length (const_char_p, optimize_args);
7868 opt_argv = (const char **) alloca (sizeof (char *) * (opt_argc + 1));
7870 for (i = 1; i < opt_argc; i++)
7871 opt_argv[i] = VEC_index (const_char_p, optimize_args, i);
7873 saved_flag_strict_aliasing = flag_strict_aliasing;
7875 /* Now parse the options. */
7876 decode_options (opt_argc, opt_argv);
7878 targetm.override_options_after_change();
7880 /* Don't allow changing -fstrict-aliasing. */
7881 flag_strict_aliasing = saved_flag_strict_aliasing;
7883 VEC_truncate (const_char_p, optimize_args, 0);
7887 /* For handling "optimize" attribute. arguments as in
7888 struct attribute_spec.handler. */
7891 handle_optimize_attribute (tree *node, tree name, tree args,
7892 int ARG_UNUSED (flags), bool *no_add_attrs)
7894 /* Ensure we have a function type. */
7895 if (TREE_CODE (*node) != FUNCTION_DECL)
7897 warning (OPT_Wattributes, "%qE attribute ignored", name);
7898 *no_add_attrs = true;
7902 struct cl_optimization cur_opts;
7903 tree old_opts = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node);
7905 /* Save current options. */
7906 cl_optimization_save (&cur_opts);
7908 /* If we previously had some optimization options, use them as the
7911 cl_optimization_restore (TREE_OPTIMIZATION (old_opts));
7913 /* Parse options, and update the vector. */
7914 parse_optimize_options (args, true);
7915 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node)
7916 = build_optimization_node ();
7918 /* Restore current options. */
7919 cl_optimization_restore (&cur_opts);
7925 /* Check for valid arguments being passed to a function.
7926 ATTRS is a list of attributes. There are NARGS arguments in the array
7927 ARGARRAY. TYPELIST is the list of argument types for the function.
7930 check_function_arguments (tree attrs, int nargs, tree *argarray, tree typelist)
7932 /* Check for null being passed in a pointer argument that must be
7933 non-null. We also need to do this if format checking is enabled. */
7936 check_function_nonnull (attrs, nargs, argarray);
7938 /* Check for errors in format strings. */
7940 if (warn_format || warn_missing_format_attribute)
7941 check_function_format (attrs, nargs, argarray);
7944 check_function_sentinel (attrs, nargs, argarray, typelist);
7947 /* Generic argument checking recursion routine. PARAM is the argument to
7948 be checked. PARAM_NUM is the number of the argument. CALLBACK is invoked
7949 once the argument is resolved. CTX is context for the callback. */
7951 check_function_arguments_recurse (void (*callback)
7952 (void *, tree, unsigned HOST_WIDE_INT),
7953 void *ctx, tree param,
7954 unsigned HOST_WIDE_INT param_num)
7956 if (CONVERT_EXPR_P (param)
7957 && (TYPE_PRECISION (TREE_TYPE (param))
7958 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (param, 0)))))
7960 /* Strip coercion. */
7961 check_function_arguments_recurse (callback, ctx,
7962 TREE_OPERAND (param, 0), param_num);
7966 if (TREE_CODE (param) == CALL_EXPR)
7968 tree type = TREE_TYPE (TREE_TYPE (CALL_EXPR_FN (param)));
7970 bool found_format_arg = false;
7972 /* See if this is a call to a known internationalization function
7973 that modifies a format arg. Such a function may have multiple
7974 format_arg attributes (for example, ngettext). */
7976 for (attrs = TYPE_ATTRIBUTES (type);
7978 attrs = TREE_CHAIN (attrs))
7979 if (is_attribute_p ("format_arg", TREE_PURPOSE (attrs)))
7982 tree format_num_expr;
7985 call_expr_arg_iterator iter;
7987 /* Extract the argument number, which was previously checked
7989 format_num_expr = TREE_VALUE (TREE_VALUE (attrs));
7991 gcc_assert (TREE_CODE (format_num_expr) == INTEGER_CST
7992 && !TREE_INT_CST_HIGH (format_num_expr));
7994 format_num = TREE_INT_CST_LOW (format_num_expr);
7996 for (inner_arg = first_call_expr_arg (param, &iter), i = 1;
7998 inner_arg = next_call_expr_arg (&iter), i++)
7999 if (i == format_num)
8001 check_function_arguments_recurse (callback, ctx,
8002 inner_arg, param_num);
8003 found_format_arg = true;
8008 /* If we found a format_arg attribute and did a recursive check,
8009 we are done with checking this argument. Otherwise, we continue
8010 and this will be considered a non-literal. */
8011 if (found_format_arg)
8015 if (TREE_CODE (param) == COND_EXPR)
8017 /* Check both halves of the conditional expression. */
8018 check_function_arguments_recurse (callback, ctx,
8019 TREE_OPERAND (param, 1), param_num);
8020 check_function_arguments_recurse (callback, ctx,
8021 TREE_OPERAND (param, 2), param_num);
8025 (*callback) (ctx, param, param_num);
8028 /* Checks for a builtin function FNDECL that the number of arguments
8029 NARGS against the required number REQUIRED and issues an error if
8030 there is a mismatch. Returns true if the number of arguments is
8031 correct, otherwise false. */
8034 builtin_function_validate_nargs (tree fndecl, int nargs, int required)
8036 if (nargs < required)
8038 error_at (input_location,
8039 "not enough arguments to function %qE", fndecl);
8042 else if (nargs > required)
8044 error_at (input_location,
8045 "too many arguments to function %qE", fndecl);
8051 /* Verifies the NARGS arguments ARGS to the builtin function FNDECL.
8052 Returns false if there was an error, otherwise true. */
8055 check_builtin_function_arguments (tree fndecl, int nargs, tree *args)
8057 if (!DECL_BUILT_IN (fndecl)
8058 || DECL_BUILT_IN_CLASS (fndecl) != BUILT_IN_NORMAL)
8061 switch (DECL_FUNCTION_CODE (fndecl))
8063 case BUILT_IN_CONSTANT_P:
8064 return builtin_function_validate_nargs (fndecl, nargs, 1);
8066 case BUILT_IN_ISFINITE:
8067 case BUILT_IN_ISINF:
8068 case BUILT_IN_ISINF_SIGN:
8069 case BUILT_IN_ISNAN:
8070 case BUILT_IN_ISNORMAL:
8071 if (builtin_function_validate_nargs (fndecl, nargs, 1))
8073 if (TREE_CODE (TREE_TYPE (args[0])) != REAL_TYPE)
8075 error ("non-floating-point argument in call to "
8076 "function %qE", fndecl);
8083 case BUILT_IN_ISGREATER:
8084 case BUILT_IN_ISGREATEREQUAL:
8085 case BUILT_IN_ISLESS:
8086 case BUILT_IN_ISLESSEQUAL:
8087 case BUILT_IN_ISLESSGREATER:
8088 case BUILT_IN_ISUNORDERED:
8089 if (builtin_function_validate_nargs (fndecl, nargs, 2))
8091 enum tree_code code0, code1;
8092 code0 = TREE_CODE (TREE_TYPE (args[0]));
8093 code1 = TREE_CODE (TREE_TYPE (args[1]));
8094 if (!((code0 == REAL_TYPE && code1 == REAL_TYPE)
8095 || (code0 == REAL_TYPE && code1 == INTEGER_TYPE)
8096 || (code0 == INTEGER_TYPE && code1 == REAL_TYPE)))
8098 error ("non-floating-point arguments in call to "
8099 "function %qE", fndecl);
8106 case BUILT_IN_FPCLASSIFY:
8107 if (builtin_function_validate_nargs (fndecl, nargs, 6))
8112 if (TREE_CODE (args[i]) != INTEGER_CST)
8114 error ("non-const integer argument %u in call to function %qE",
8119 if (TREE_CODE (TREE_TYPE (args[5])) != REAL_TYPE)
8121 error ("non-floating-point argument in call to function %qE",
8134 /* Function to help qsort sort FIELD_DECLs by name order. */
8137 field_decl_cmp (const void *x_p, const void *y_p)
8139 const tree *const x = (const tree *const) x_p;
8140 const tree *const y = (const tree *const) y_p;
8142 if (DECL_NAME (*x) == DECL_NAME (*y))
8143 /* A nontype is "greater" than a type. */
8144 return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL);
8145 if (DECL_NAME (*x) == NULL_TREE)
8147 if (DECL_NAME (*y) == NULL_TREE)
8149 if (DECL_NAME (*x) < DECL_NAME (*y))
8155 gt_pointer_operator new_value;
8159 /* This routine compares two fields like field_decl_cmp but using the
8160 pointer operator in resort_data. */
8163 resort_field_decl_cmp (const void *x_p, const void *y_p)
8165 const tree *const x = (const tree *const) x_p;
8166 const tree *const y = (const tree *const) y_p;
8168 if (DECL_NAME (*x) == DECL_NAME (*y))
8169 /* A nontype is "greater" than a type. */
8170 return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL);
8171 if (DECL_NAME (*x) == NULL_TREE)
8173 if (DECL_NAME (*y) == NULL_TREE)
8176 tree d1 = DECL_NAME (*x);
8177 tree d2 = DECL_NAME (*y);
8178 resort_data.new_value (&d1, resort_data.cookie);
8179 resort_data.new_value (&d2, resort_data.cookie);
8186 /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */
8189 resort_sorted_fields (void *obj,
8190 void * ARG_UNUSED (orig_obj),
8191 gt_pointer_operator new_value,
8194 struct sorted_fields_type *sf = (struct sorted_fields_type *) obj;
8195 resort_data.new_value = new_value;
8196 resort_data.cookie = cookie;
8197 qsort (&sf->elts[0], sf->len, sizeof (tree),
8198 resort_field_decl_cmp);
8201 /* Subroutine of c_parse_error.
8202 Return the result of concatenating LHS and RHS. RHS is really
8203 a string literal, its first character is indicated by RHS_START and
8204 RHS_SIZE is its length (including the terminating NUL character).
8206 The caller is responsible for deleting the returned pointer. */
8209 catenate_strings (const char *lhs, const char *rhs_start, int rhs_size)
8211 const int lhs_size = strlen (lhs);
8212 char *result = XNEWVEC (char, lhs_size + rhs_size);
8213 strncpy (result, lhs, lhs_size);
8214 strncpy (result + lhs_size, rhs_start, rhs_size);
8218 /* Issue the error given by GMSGID, indicating that it occurred before
8219 TOKEN, which had the associated VALUE. */
8222 c_parse_error (const char *gmsgid, enum cpp_ttype token_type,
8223 tree value, unsigned char token_flags)
8225 #define catenate_messages(M1, M2) catenate_strings ((M1), (M2), sizeof (M2))
8227 char *message = NULL;
8229 if (token_type == CPP_EOF)
8230 message = catenate_messages (gmsgid, " at end of input");
8231 else if (token_type == CPP_CHAR
8232 || token_type == CPP_WCHAR
8233 || token_type == CPP_CHAR16
8234 || token_type == CPP_CHAR32)
8236 unsigned int val = TREE_INT_CST_LOW (value);
8255 if (val <= UCHAR_MAX && ISGRAPH (val))
8256 message = catenate_messages (gmsgid, " before %s'%c'");
8258 message = catenate_messages (gmsgid, " before %s'\\x%x'");
8260 error (message, prefix, val);
8264 else if (token_type == CPP_STRING
8265 || token_type == CPP_WSTRING
8266 || token_type == CPP_STRING16
8267 || token_type == CPP_STRING32
8268 || token_type == CPP_UTF8STRING)
8269 message = catenate_messages (gmsgid, " before string constant");
8270 else if (token_type == CPP_NUMBER)
8271 message = catenate_messages (gmsgid, " before numeric constant");
8272 else if (token_type == CPP_NAME)
8274 message = catenate_messages (gmsgid, " before %qE");
8275 error (message, value);
8279 else if (token_type == CPP_PRAGMA)
8280 message = catenate_messages (gmsgid, " before %<#pragma%>");
8281 else if (token_type == CPP_PRAGMA_EOL)
8282 message = catenate_messages (gmsgid, " before end of line");
8283 else if (token_type < N_TTYPES)
8285 message = catenate_messages (gmsgid, " before %qs token");
8286 error (message, cpp_type2name (token_type, token_flags));
8298 #undef catenate_messages
8301 /* Mapping for cpp message reasons to the options that enable them. */
8303 struct reason_option_codes_t
8305 const int reason; /* cpplib message reason. */
8306 const int option_code; /* gcc option that controls this message. */
8309 static const struct reason_option_codes_t option_codes[] = {
8310 {CPP_W_DEPRECATED, OPT_Wdeprecated},
8311 {CPP_W_COMMENTS, OPT_Wcomments},
8312 {CPP_W_TRIGRAPHS, OPT_Wtrigraphs},
8313 {CPP_W_MULTICHAR, OPT_Wmultichar},
8314 {CPP_W_TRADITIONAL, OPT_Wtraditional},
8315 {CPP_W_LONG_LONG, OPT_Wlong_long},
8316 {CPP_W_ENDIF_LABELS, OPT_Wendif_labels},
8317 {CPP_W_VARIADIC_MACROS, OPT_Wvariadic_macros},
8318 {CPP_W_BUILTIN_MACRO_REDEFINED, OPT_Wbuiltin_macro_redefined},
8319 {CPP_W_UNDEF, OPT_Wundef},
8320 {CPP_W_UNUSED_MACROS, OPT_Wunused_macros},
8321 {CPP_W_CXX_OPERATOR_NAMES, OPT_Wc___compat},
8322 {CPP_W_NORMALIZE, OPT_Wnormalized_},
8323 {CPP_W_INVALID_PCH, OPT_Winvalid_pch},
8324 {CPP_W_WARNING_DIRECTIVE, OPT_Wcpp},
8328 /* Return the gcc option code associated with the reason for a cpp
8329 message, or 0 if none. */
8332 c_option_controlling_cpp_error (int reason)
8334 const struct reason_option_codes_t *entry;
8336 for (entry = option_codes; entry->reason != CPP_W_NONE; entry++)
8338 if (entry->reason == reason)
8339 return entry->option_code;
8344 /* Callback from cpp_error for PFILE to print diagnostics from the
8345 preprocessor. The diagnostic is of type LEVEL, with REASON set
8346 to the reason code if LEVEL is represents a warning, at location
8347 LOCATION unless this is after lexing and the compiler's location
8348 should be used instead, with column number possibly overridden by
8349 COLUMN_OVERRIDE if not zero; MSG is the translated message and AP
8350 the arguments. Returns true if a diagnostic was emitted, false
8354 c_cpp_error (cpp_reader *pfile ATTRIBUTE_UNUSED, int level, int reason,
8355 location_t location, unsigned int column_override,
8356 const char *msg, va_list *ap)
8358 diagnostic_info diagnostic;
8359 diagnostic_t dlevel;
8360 int save_warn_system_headers = warn_system_headers;
8365 case CPP_DL_WARNING_SYSHDR:
8368 warn_system_headers = 1;
8370 case CPP_DL_WARNING:
8373 dlevel = DK_WARNING;
8375 case CPP_DL_PEDWARN:
8376 if (flag_no_output && !flag_pedantic_errors)
8378 dlevel = DK_PEDWARN;
8396 location = input_location;
8397 diagnostic_set_info_translated (&diagnostic, msg, ap,
8399 if (column_override)
8400 diagnostic_override_column (&diagnostic, column_override);
8401 diagnostic_override_option_index (&diagnostic,
8402 c_option_controlling_cpp_error (reason));
8403 ret = report_diagnostic (&diagnostic);
8404 if (level == CPP_DL_WARNING_SYSHDR)
8405 warn_system_headers = save_warn_system_headers;
8409 /* Convert a character from the host to the target execution character
8410 set. cpplib handles this, mostly. */
8413 c_common_to_target_charset (HOST_WIDE_INT c)
8415 /* Character constants in GCC proper are sign-extended under -fsigned-char,
8416 zero-extended under -fno-signed-char. cpplib insists that characters
8417 and character constants are always unsigned. Hence we must convert
8419 cppchar_t uc = ((cppchar_t)c) & ((((cppchar_t)1) << CHAR_BIT)-1);
8421 uc = cpp_host_to_exec_charset (parse_in, uc);
8423 if (flag_signed_char)
8424 return ((HOST_WIDE_INT)uc) << (HOST_BITS_PER_WIDE_INT - CHAR_TYPE_SIZE)
8425 >> (HOST_BITS_PER_WIDE_INT - CHAR_TYPE_SIZE);
8430 /* Build the result of __builtin_offsetof. EXPR is a nested sequence of
8431 component references, with STOP_REF, or alternatively an INDIRECT_REF of
8432 NULL, at the bottom; much like the traditional rendering of offsetof as a
8433 macro. Returns the folded and properly cast result. */
8436 fold_offsetof_1 (tree expr, tree stop_ref)
8438 enum tree_code code = PLUS_EXPR;
8441 if (expr == stop_ref && TREE_CODE (expr) != ERROR_MARK)
8442 return size_zero_node;
8444 switch (TREE_CODE (expr))
8450 error ("cannot apply %<offsetof%> to static data member %qD", expr);
8451 return error_mark_node;
8455 error ("cannot apply %<offsetof%> when %<operator[]%> is overloaded");
8456 return error_mark_node;
8460 if (!integer_zerop (TREE_OPERAND (expr, 0)))
8462 error ("cannot apply %<offsetof%> to a non constant address");
8463 return error_mark_node;
8465 return size_zero_node;
8468 base = fold_offsetof_1 (TREE_OPERAND (expr, 0), stop_ref);
8469 if (base == error_mark_node)
8472 t = TREE_OPERAND (expr, 1);
8473 if (DECL_C_BIT_FIELD (t))
8475 error ("attempt to take address of bit-field structure "
8477 return error_mark_node;
8479 off = size_binop_loc (input_location, PLUS_EXPR, DECL_FIELD_OFFSET (t),
8480 size_int (tree_low_cst (DECL_FIELD_BIT_OFFSET (t),
8486 base = fold_offsetof_1 (TREE_OPERAND (expr, 0), stop_ref);
8487 if (base == error_mark_node)
8490 t = TREE_OPERAND (expr, 1);
8491 if (TREE_CODE (t) == INTEGER_CST && tree_int_cst_sgn (t) < 0)
8494 t = fold_build1_loc (input_location, NEGATE_EXPR, TREE_TYPE (t), t);
8496 t = convert (sizetype, t);
8497 off = size_binop (MULT_EXPR, TYPE_SIZE_UNIT (TREE_TYPE (expr)), t);
8499 /* Check if the offset goes beyond the upper bound of the array. */
8500 if (code == PLUS_EXPR && TREE_CODE (t) == INTEGER_CST)
8502 tree upbound = array_ref_up_bound (expr);
8503 if (upbound != NULL_TREE
8504 && TREE_CODE (upbound) == INTEGER_CST
8505 && !tree_int_cst_equal (upbound,
8506 TYPE_MAX_VALUE (TREE_TYPE (upbound))))
8508 upbound = size_binop (PLUS_EXPR, upbound,
8509 build_int_cst (TREE_TYPE (upbound), 1));
8510 if (tree_int_cst_lt (upbound, t))
8514 for (v = TREE_OPERAND (expr, 0);
8515 TREE_CODE (v) == COMPONENT_REF;
8516 v = TREE_OPERAND (v, 0))
8517 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (v, 0)))
8520 tree fld_chain = TREE_CHAIN (TREE_OPERAND (v, 1));
8521 for (; fld_chain; fld_chain = TREE_CHAIN (fld_chain))
8522 if (TREE_CODE (fld_chain) == FIELD_DECL)
8528 /* Don't warn if the array might be considered a poor
8529 man's flexible array member with a very permissive
8530 definition thereof. */
8531 if (TREE_CODE (v) == ARRAY_REF
8532 || TREE_CODE (v) == COMPONENT_REF)
8533 warning (OPT_Warray_bounds,
8534 "index %E denotes an offset "
8535 "greater than size of %qT",
8536 t, TREE_TYPE (TREE_OPERAND (expr, 0)));
8543 /* Handle static members of volatile structs. */
8544 t = TREE_OPERAND (expr, 1);
8545 gcc_assert (TREE_CODE (t) == VAR_DECL);
8546 return fold_offsetof_1 (t, stop_ref);
8552 return size_binop (code, base, off);
8556 fold_offsetof (tree expr, tree stop_ref)
8558 /* Convert back from the internal sizetype to size_t. */
8559 return convert (size_type_node, fold_offsetof_1 (expr, stop_ref));
8562 /* Print an error message for an invalid lvalue. USE says
8563 how the lvalue is being used and so selects the error message. */
8566 lvalue_error (enum lvalue_use use)
8571 error ("lvalue required as left operand of assignment");
8574 error ("lvalue required as increment operand");
8577 error ("lvalue required as decrement operand");
8580 error ("lvalue required as unary %<&%> operand");
8583 error ("lvalue required in asm statement");
8590 /* *PTYPE is an incomplete array. Complete it with a domain based on
8591 INITIAL_VALUE. If INITIAL_VALUE is not present, use 1 if DO_DEFAULT
8592 is true. Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8593 2 if INITIAL_VALUE was NULL, and 3 if INITIAL_VALUE was empty. */
8596 complete_array_type (tree *ptype, tree initial_value, bool do_default)
8598 tree maxindex, type, main_type, elt, unqual_elt;
8599 int failure = 0, quals;
8600 hashval_t hashcode = 0;
8602 maxindex = size_zero_node;
8605 if (TREE_CODE (initial_value) == STRING_CST)
8608 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
8609 maxindex = size_int (TREE_STRING_LENGTH (initial_value)/eltsize - 1);
8611 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
8613 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
8615 if (VEC_empty (constructor_elt, v))
8619 maxindex = integer_minus_one_node;
8624 unsigned HOST_WIDE_INT cnt;
8625 constructor_elt *ce;
8626 bool fold_p = false;
8628 if (VEC_index (constructor_elt, v, 0)->index)
8629 maxindex = fold_convert_loc (input_location, sizetype,
8630 VEC_index (constructor_elt,
8632 curindex = maxindex;
8635 VEC_iterate (constructor_elt, v, cnt, ce);
8638 bool curfold_p = false;
8640 curindex = ce->index, curfold_p = true;
8644 curindex = fold_convert (sizetype, curindex);
8645 curindex = size_binop (PLUS_EXPR, curindex,
8648 if (tree_int_cst_lt (maxindex, curindex))
8649 maxindex = curindex, fold_p = curfold_p;
8652 maxindex = fold_convert (sizetype, maxindex);
8657 /* Make an error message unless that happened already. */
8658 if (initial_value != error_mark_node)
8670 elt = TREE_TYPE (type);
8671 quals = TYPE_QUALS (strip_array_types (elt));
8675 unqual_elt = c_build_qualified_type (elt, KEEP_QUAL_ADDR_SPACE (quals));
8677 /* Using build_distinct_type_copy and modifying things afterward instead
8678 of using build_array_type to create a new type preserves all of the
8679 TYPE_LANG_FLAG_? bits that the front end may have set. */
8680 main_type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
8681 TREE_TYPE (main_type) = unqual_elt;
8682 TYPE_DOMAIN (main_type) = build_index_type (maxindex);
8683 layout_type (main_type);
8685 /* Make sure we have the canonical MAIN_TYPE. */
8686 hashcode = iterative_hash_object (TYPE_HASH (unqual_elt), hashcode);
8687 hashcode = iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (main_type)),
8689 main_type = type_hash_canon (hashcode, main_type);
8691 /* Fix the canonical type. */
8692 if (TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (main_type))
8693 || TYPE_STRUCTURAL_EQUALITY_P (TYPE_DOMAIN (main_type)))
8694 SET_TYPE_STRUCTURAL_EQUALITY (main_type);
8695 else if (TYPE_CANONICAL (TREE_TYPE (main_type)) != TREE_TYPE (main_type)
8696 || (TYPE_CANONICAL (TYPE_DOMAIN (main_type))
8697 != TYPE_DOMAIN (main_type)))
8698 TYPE_CANONICAL (main_type)
8699 = build_array_type (TYPE_CANONICAL (TREE_TYPE (main_type)),
8700 TYPE_CANONICAL (TYPE_DOMAIN (main_type)));
8702 TYPE_CANONICAL (main_type) = main_type;
8707 type = c_build_qualified_type (main_type, quals);
8709 if (COMPLETE_TYPE_P (type)
8710 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8711 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8713 error ("size of array is too large");
8714 /* If we proceed with the array type as it is, we'll eventually
8715 crash in tree_low_cst(). */
8716 type = error_mark_node;
8724 /* Used to help initialize the builtin-types.def table. When a type of
8725 the correct size doesn't exist, use error_mark_node instead of NULL.
8726 The later results in segfaults even when a decl using the type doesn't
8730 builtin_type_for_size (int size, bool unsignedp)
8732 tree type = lang_hooks.types.type_for_size (size, unsignedp);
8733 return type ? type : error_mark_node;
8736 /* A helper function for resolve_overloaded_builtin in resolving the
8737 overloaded __sync_ builtins. Returns a positive power of 2 if the
8738 first operand of PARAMS is a pointer to a supported data type.
8739 Returns 0 if an error is encountered. */
8742 sync_resolve_size (tree function, VEC(tree,gc) *params)
8747 if (VEC_empty (tree, params))
8749 error ("too few arguments to function %qE", function);
8753 type = TREE_TYPE (VEC_index (tree, params, 0));
8754 if (TREE_CODE (type) != POINTER_TYPE)
8757 type = TREE_TYPE (type);
8758 if (!INTEGRAL_TYPE_P (type) && !POINTER_TYPE_P (type))
8761 size = tree_low_cst (TYPE_SIZE_UNIT (type), 1);
8762 if (size == 1 || size == 2 || size == 4 || size == 8 || size == 16)
8766 error ("incompatible type for argument %d of %qE", 1, function);
8770 /* A helper function for resolve_overloaded_builtin. Adds casts to
8771 PARAMS to make arguments match up with those of FUNCTION. Drops
8772 the variadic arguments at the end. Returns false if some error
8773 was encountered; true on success. */
8776 sync_resolve_params (tree orig_function, tree function, VEC(tree, gc) *params)
8778 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (function));
8780 unsigned int parmnum;
8782 /* We've declared the implementation functions to use "volatile void *"
8783 as the pointer parameter, so we shouldn't get any complaints from the
8784 call to check_function_arguments what ever type the user used. */
8785 arg_types = TREE_CHAIN (arg_types);
8786 ptype = TREE_TYPE (TREE_TYPE (VEC_index (tree, params, 0)));
8788 /* For the rest of the values, we need to cast these to FTYPE, so that we
8789 don't get warnings for passing pointer types, etc. */
8791 while (arg_types != void_list_node)
8796 if (VEC_length (tree, params) <= parmnum)
8798 error ("too few arguments to function %qE", orig_function);
8802 /* ??? Ideally for the first conversion we'd use convert_for_assignment
8803 so that we get warnings for anything that doesn't match the pointer
8804 type. This isn't portable across the C and C++ front ends atm. */
8805 val = VEC_index (tree, params, parmnum);
8806 val = convert (ptype, val);
8807 val = convert (TREE_VALUE (arg_types), val);
8808 VEC_replace (tree, params, parmnum, val);
8810 arg_types = TREE_CHAIN (arg_types);
8813 /* The definition of these primitives is variadic, with the remaining
8814 being "an optional list of variables protected by the memory barrier".
8815 No clue what that's supposed to mean, precisely, but we consider all
8816 call-clobbered variables to be protected so we're safe. */
8817 VEC_truncate (tree, params, parmnum + 1);
8822 /* A helper function for resolve_overloaded_builtin. Adds a cast to
8823 RESULT to make it match the type of the first pointer argument in
8827 sync_resolve_return (tree first_param, tree result)
8829 tree ptype = TREE_TYPE (TREE_TYPE (first_param));
8830 ptype = TYPE_MAIN_VARIANT (ptype);
8831 return convert (ptype, result);
8834 /* Some builtin functions are placeholders for other expressions. This
8835 function should be called immediately after parsing the call expression
8836 before surrounding code has committed to the type of the expression.
8838 LOC is the location of the builtin call.
8840 FUNCTION is the DECL that has been invoked; it is known to be a builtin.
8841 PARAMS is the argument list for the call. The return value is non-null
8842 when expansion is complete, and null if normal processing should
8846 resolve_overloaded_builtin (location_t loc, tree function, VEC(tree,gc) *params)
8848 enum built_in_function orig_code = DECL_FUNCTION_CODE (function);
8849 switch (DECL_BUILT_IN_CLASS (function))
8851 case BUILT_IN_NORMAL:
8854 if (targetm.resolve_overloaded_builtin)
8855 return targetm.resolve_overloaded_builtin (loc, function, params);
8862 /* Handle BUILT_IN_NORMAL here. */
8865 case BUILT_IN_FETCH_AND_ADD_N:
8866 case BUILT_IN_FETCH_AND_SUB_N:
8867 case BUILT_IN_FETCH_AND_OR_N:
8868 case BUILT_IN_FETCH_AND_AND_N:
8869 case BUILT_IN_FETCH_AND_XOR_N:
8870 case BUILT_IN_FETCH_AND_NAND_N:
8871 case BUILT_IN_ADD_AND_FETCH_N:
8872 case BUILT_IN_SUB_AND_FETCH_N:
8873 case BUILT_IN_OR_AND_FETCH_N:
8874 case BUILT_IN_AND_AND_FETCH_N:
8875 case BUILT_IN_XOR_AND_FETCH_N:
8876 case BUILT_IN_NAND_AND_FETCH_N:
8877 case BUILT_IN_BOOL_COMPARE_AND_SWAP_N:
8878 case BUILT_IN_VAL_COMPARE_AND_SWAP_N:
8879 case BUILT_IN_LOCK_TEST_AND_SET_N:
8880 case BUILT_IN_LOCK_RELEASE_N:
8882 int n = sync_resolve_size (function, params);
8883 tree new_function, first_param, result;
8886 return error_mark_node;
8888 new_function = built_in_decls[orig_code + exact_log2 (n) + 1];
8889 if (!sync_resolve_params (function, new_function, params))
8890 return error_mark_node;
8892 first_param = VEC_index (tree, params, 0);
8893 result = build_function_call_vec (loc, new_function, params, NULL);
8894 if (orig_code != BUILT_IN_BOOL_COMPARE_AND_SWAP_N
8895 && orig_code != BUILT_IN_LOCK_RELEASE_N)
8896 result = sync_resolve_return (first_param, result);
8906 /* Ignoring their sign, return true if two scalar types are the same. */
8908 same_scalar_type_ignoring_signedness (tree t1, tree t2)
8910 enum tree_code c1 = TREE_CODE (t1), c2 = TREE_CODE (t2);
8912 gcc_assert ((c1 == INTEGER_TYPE || c1 == REAL_TYPE || c1 == FIXED_POINT_TYPE)
8913 && (c2 == INTEGER_TYPE || c2 == REAL_TYPE
8914 || c2 == FIXED_POINT_TYPE));
8916 /* Equality works here because c_common_signed_type uses
8917 TYPE_MAIN_VARIANT. */
8918 return c_common_signed_type (t1)
8919 == c_common_signed_type (t2);
8922 /* Check for missing format attributes on function pointers. LTYPE is
8923 the new type or left-hand side type. RTYPE is the old type or
8924 right-hand side type. Returns TRUE if LTYPE is missing the desired
8928 check_missing_format_attribute (tree ltype, tree rtype)
8930 tree const ttr = TREE_TYPE (rtype), ttl = TREE_TYPE (ltype);
8933 for (ra = TYPE_ATTRIBUTES (ttr); ra; ra = TREE_CHAIN (ra))
8934 if (is_attribute_p ("format", TREE_PURPOSE (ra)))
8939 for (la = TYPE_ATTRIBUTES (ttl); la; la = TREE_CHAIN (la))
8940 if (is_attribute_p ("format", TREE_PURPOSE (la)))
8948 /* Subscripting with type char is likely to lose on a machine where
8949 chars are signed. So warn on any machine, but optionally. Don't
8950 warn for unsigned char since that type is safe. Don't warn for
8951 signed char because anyone who uses that must have done so
8952 deliberately. Furthermore, we reduce the false positive load by
8953 warning only for non-constant value of type char. */
8956 warn_array_subscript_with_type_char (tree index)
8958 if (TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node
8959 && TREE_CODE (index) != INTEGER_CST)
8960 warning (OPT_Wchar_subscripts, "array subscript has type %<char%>");
8963 /* Implement -Wparentheses for the unexpected C precedence rules, to
8964 cover cases like x + y << z which readers are likely to
8965 misinterpret. We have seen an expression in which CODE is a binary
8966 operator used to combine expressions ARG_LEFT and ARG_RIGHT, which
8967 before folding had CODE_LEFT and CODE_RIGHT. CODE_LEFT and
8968 CODE_RIGHT may be ERROR_MARK, which means that that side of the
8969 expression was not formed using a binary or unary operator, or it
8970 was enclosed in parentheses. */
8973 warn_about_parentheses (enum tree_code code,
8974 enum tree_code code_left, tree arg_left,
8975 enum tree_code code_right, tree arg_right)
8977 if (!warn_parentheses)
8980 /* This macro tests that the expression ARG with original tree code
8981 CODE appears to be a boolean expression. or the result of folding a
8982 boolean expression. */
8983 #define APPEARS_TO_BE_BOOLEAN_EXPR_P(CODE, ARG) \
8984 (truth_value_p (TREE_CODE (ARG)) \
8985 || TREE_CODE (TREE_TYPE (ARG)) == BOOLEAN_TYPE \
8986 /* Folding may create 0 or 1 integers from other expressions. */ \
8987 || ((CODE) != INTEGER_CST \
8988 && (integer_onep (ARG) || integer_zerop (ARG))))
8993 if (code_left == PLUS_EXPR || code_right == PLUS_EXPR)
8994 warning (OPT_Wparentheses,
8995 "suggest parentheses around %<+%> inside %<<<%>");
8996 else if (code_left == MINUS_EXPR || code_right == MINUS_EXPR)
8997 warning (OPT_Wparentheses,
8998 "suggest parentheses around %<-%> inside %<<<%>");
9002 if (code_left == PLUS_EXPR || code_right == PLUS_EXPR)
9003 warning (OPT_Wparentheses,
9004 "suggest parentheses around %<+%> inside %<>>%>");
9005 else if (code_left == MINUS_EXPR || code_right == MINUS_EXPR)
9006 warning (OPT_Wparentheses,
9007 "suggest parentheses around %<-%> inside %<>>%>");
9010 case TRUTH_ORIF_EXPR:
9011 if (code_left == TRUTH_ANDIF_EXPR || code_right == TRUTH_ANDIF_EXPR)
9012 warning (OPT_Wparentheses,
9013 "suggest parentheses around %<&&%> within %<||%>");
9017 if (code_left == BIT_AND_EXPR || code_left == BIT_XOR_EXPR
9018 || code_left == PLUS_EXPR || code_left == MINUS_EXPR
9019 || code_right == BIT_AND_EXPR || code_right == BIT_XOR_EXPR
9020 || code_right == PLUS_EXPR || code_right == MINUS_EXPR)
9021 warning (OPT_Wparentheses,
9022 "suggest parentheses around arithmetic in operand of %<|%>");
9023 /* Check cases like x|y==z */
9024 else if (TREE_CODE_CLASS (code_left) == tcc_comparison
9025 || TREE_CODE_CLASS (code_right) == tcc_comparison)
9026 warning (OPT_Wparentheses,
9027 "suggest parentheses around comparison in operand of %<|%>");
9028 /* Check cases like !x | y */
9029 else if (code_left == TRUTH_NOT_EXPR
9030 && !APPEARS_TO_BE_BOOLEAN_EXPR_P (code_right, arg_right))
9031 warning (OPT_Wparentheses, "suggest parentheses around operand of "
9032 "%<!%> or change %<|%> to %<||%> or %<!%> to %<~%>");
9036 if (code_left == BIT_AND_EXPR
9037 || code_left == PLUS_EXPR || code_left == MINUS_EXPR
9038 || code_right == BIT_AND_EXPR
9039 || code_right == PLUS_EXPR || code_right == MINUS_EXPR)
9040 warning (OPT_Wparentheses,
9041 "suggest parentheses around arithmetic in operand of %<^%>");
9042 /* Check cases like x^y==z */
9043 else if (TREE_CODE_CLASS (code_left) == tcc_comparison
9044 || TREE_CODE_CLASS (code_right) == tcc_comparison)
9045 warning (OPT_Wparentheses,
9046 "suggest parentheses around comparison in operand of %<^%>");
9050 if (code_left == PLUS_EXPR || code_right == PLUS_EXPR)
9051 warning (OPT_Wparentheses,
9052 "suggest parentheses around %<+%> in operand of %<&%>");
9053 else if (code_left == MINUS_EXPR || code_right == MINUS_EXPR)
9054 warning (OPT_Wparentheses,
9055 "suggest parentheses around %<-%> in operand of %<&%>");
9056 /* Check cases like x&y==z */
9057 else if (TREE_CODE_CLASS (code_left) == tcc_comparison
9058 || TREE_CODE_CLASS (code_right) == tcc_comparison)
9059 warning (OPT_Wparentheses,
9060 "suggest parentheses around comparison in operand of %<&%>");
9061 /* Check cases like !x & y */
9062 else if (code_left == TRUTH_NOT_EXPR
9063 && !APPEARS_TO_BE_BOOLEAN_EXPR_P (code_right, arg_right))
9064 warning (OPT_Wparentheses, "suggest parentheses around operand of "
9065 "%<!%> or change %<&%> to %<&&%> or %<!%> to %<~%>");
9069 if (TREE_CODE_CLASS (code_left) == tcc_comparison
9070 || TREE_CODE_CLASS (code_right) == tcc_comparison)
9071 warning (OPT_Wparentheses,
9072 "suggest parentheses around comparison in operand of %<==%>");
9075 if (TREE_CODE_CLASS (code_left) == tcc_comparison
9076 || TREE_CODE_CLASS (code_right) == tcc_comparison)
9077 warning (OPT_Wparentheses,
9078 "suggest parentheses around comparison in operand of %<!=%>");
9082 if (TREE_CODE_CLASS (code) == tcc_comparison
9083 && ((TREE_CODE_CLASS (code_left) == tcc_comparison
9084 && code_left != NE_EXPR && code_left != EQ_EXPR
9085 && INTEGRAL_TYPE_P (TREE_TYPE (arg_left)))
9086 || (TREE_CODE_CLASS (code_right) == tcc_comparison
9087 && code_right != NE_EXPR && code_right != EQ_EXPR
9088 && INTEGRAL_TYPE_P (TREE_TYPE (arg_right)))))
9089 warning (OPT_Wparentheses, "comparisons like %<X<=Y<=Z%> do not "
9090 "have their mathematical meaning");
9093 #undef NOT_A_BOOLEAN_EXPR_P
9096 /* If LABEL (a LABEL_DECL) has not been used, issue a warning. */
9099 warn_for_unused_label (tree label)
9101 if (!TREE_USED (label))
9103 if (DECL_INITIAL (label))
9104 warning (OPT_Wunused_label, "label %q+D defined but not used", label);
9106 warning (OPT_Wunused_label, "label %q+D declared but not defined", label);
9110 #ifndef TARGET_HAS_TARGETCM
9111 struct gcc_targetcm targetcm = TARGETCM_INITIALIZER;
9114 /* Warn for division by zero according to the value of DIVISOR. LOC
9115 is the location of the division operator. */
9118 warn_for_div_by_zero (location_t loc, tree divisor)
9120 /* If DIVISOR is zero, and has integral or fixed-point type, issue a warning
9121 about division by zero. Do not issue a warning if DIVISOR has a
9122 floating-point type, since we consider 0.0/0.0 a valid way of
9123 generating a NaN. */
9124 if (c_inhibit_evaluation_warnings == 0
9125 && (integer_zerop (divisor) || fixed_zerop (divisor)))
9126 warning_at (loc, OPT_Wdiv_by_zero, "division by zero");
9129 /* Subroutine of build_binary_op. Give warnings for comparisons
9130 between signed and unsigned quantities that may fail. Do the
9131 checking based on the original operand trees ORIG_OP0 and ORIG_OP1,
9132 so that casts will be considered, but default promotions won't
9135 LOCATION is the location of the comparison operator.
9137 The arguments of this function map directly to local variables
9138 of build_binary_op. */
9141 warn_for_sign_compare (location_t location,
9142 tree orig_op0, tree orig_op1,
9144 tree result_type, enum tree_code resultcode)
9146 int op0_signed = !TYPE_UNSIGNED (TREE_TYPE (orig_op0));
9147 int op1_signed = !TYPE_UNSIGNED (TREE_TYPE (orig_op1));
9148 int unsignedp0, unsignedp1;
9150 /* In C++, check for comparison of different enum types. */
9152 && TREE_CODE (TREE_TYPE (orig_op0)) == ENUMERAL_TYPE
9153 && TREE_CODE (TREE_TYPE (orig_op1)) == ENUMERAL_TYPE
9154 && TYPE_MAIN_VARIANT (TREE_TYPE (orig_op0))
9155 != TYPE_MAIN_VARIANT (TREE_TYPE (orig_op1)))
9157 warning_at (location,
9158 OPT_Wsign_compare, "comparison between types %qT and %qT",
9159 TREE_TYPE (orig_op0), TREE_TYPE (orig_op1));
9162 /* Do not warn if the comparison is being done in a signed type,
9163 since the signed type will only be chosen if it can represent
9164 all the values of the unsigned type. */
9165 if (!TYPE_UNSIGNED (result_type))
9167 /* Do not warn if both operands are unsigned. */
9168 else if (op0_signed == op1_signed)
9172 tree sop, uop, base_type;
9176 sop = orig_op0, uop = orig_op1;
9178 sop = orig_op1, uop = orig_op0;
9180 STRIP_TYPE_NOPS (sop);
9181 STRIP_TYPE_NOPS (uop);
9182 base_type = (TREE_CODE (result_type) == COMPLEX_TYPE
9183 ? TREE_TYPE (result_type) : result_type);
9185 /* Do not warn if the signed quantity is an unsuffixed integer
9186 literal (or some static constant expression involving such
9187 literals or a conditional expression involving such literals)
9188 and it is non-negative. */
9189 if (tree_expr_nonnegative_warnv_p (sop, &ovf))
9191 /* Do not warn if the comparison is an equality operation, the
9192 unsigned quantity is an integral constant, and it would fit
9193 in the result if the result were signed. */
9194 else if (TREE_CODE (uop) == INTEGER_CST
9195 && (resultcode == EQ_EXPR || resultcode == NE_EXPR)
9196 && int_fits_type_p (uop, c_common_signed_type (base_type)))
9198 /* In C, do not warn if the unsigned quantity is an enumeration
9199 constant and its maximum value would fit in the result if the
9200 result were signed. */
9201 else if (!c_dialect_cxx() && TREE_CODE (uop) == INTEGER_CST
9202 && TREE_CODE (TREE_TYPE (uop)) == ENUMERAL_TYPE
9203 && int_fits_type_p (TYPE_MAX_VALUE (TREE_TYPE (uop)),
9204 c_common_signed_type (base_type)))
9207 warning_at (location,
9209 "comparison between signed and unsigned integer expressions");
9212 /* Warn if two unsigned values are being compared in a size larger
9213 than their original size, and one (and only one) is the result of
9214 a `~' operator. This comparison will always fail.
9216 Also warn if one operand is a constant, and the constant does not
9217 have all bits set that are set in the ~ operand when it is
9220 op0 = get_narrower (op0, &unsignedp0);
9221 op1 = get_narrower (op1, &unsignedp1);
9223 if ((TREE_CODE (op0) == BIT_NOT_EXPR)
9224 ^ (TREE_CODE (op1) == BIT_NOT_EXPR))
9226 if (TREE_CODE (op0) == BIT_NOT_EXPR)
9227 op0 = get_narrower (TREE_OPERAND (op0, 0), &unsignedp0);
9228 if (TREE_CODE (op1) == BIT_NOT_EXPR)
9229 op1 = get_narrower (TREE_OPERAND (op1, 0), &unsignedp1);
9231 if (host_integerp (op0, 0) || host_integerp (op1, 0))
9234 HOST_WIDE_INT constant, mask;
9238 if (host_integerp (op0, 0))
9241 unsignedp = unsignedp1;
9242 constant = tree_low_cst (op0, 0);
9247 unsignedp = unsignedp0;
9248 constant = tree_low_cst (op1, 0);
9251 bits = TYPE_PRECISION (TREE_TYPE (primop));
9252 if (bits < TYPE_PRECISION (result_type)
9253 && bits < HOST_BITS_PER_LONG && unsignedp)
9255 mask = (~ (HOST_WIDE_INT) 0) << bits;
9256 if ((mask & constant) != mask)
9259 warning (OPT_Wsign_compare,
9260 "promoted ~unsigned is always non-zero");
9262 warning_at (location, OPT_Wsign_compare,
9263 "comparison of promoted ~unsigned with constant");
9267 else if (unsignedp0 && unsignedp1
9268 && (TYPE_PRECISION (TREE_TYPE (op0))
9269 < TYPE_PRECISION (result_type))
9270 && (TYPE_PRECISION (TREE_TYPE (op1))
9271 < TYPE_PRECISION (result_type)))
9272 warning_at (location, OPT_Wsign_compare,
9273 "comparison of promoted ~unsigned with unsigned");
9277 /* Setup a TYPE_DECL node as a typedef representation.
9279 X is a TYPE_DECL for a typedef statement. Create a brand new
9280 ..._TYPE node (which will be just a variant of the existing
9281 ..._TYPE node with identical properties) and then install X
9282 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
9284 The whole point here is to end up with a situation where each
9285 and every ..._TYPE node the compiler creates will be uniquely
9286 associated with AT MOST one node representing a typedef name.
9287 This way, even though the compiler substitutes corresponding
9288 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
9289 early on, later parts of the compiler can always do the reverse
9290 translation and get back the corresponding typedef name. For
9293 typedef struct S MY_TYPE;
9296 Later parts of the compiler might only know that `object' was of
9297 type `struct S' if it were not for code just below. With this
9298 code however, later parts of the compiler see something like:
9300 struct S' == struct S
9301 typedef struct S' MY_TYPE;
9304 And they can then deduce (from the node for type struct S') that
9305 the original object declaration was:
9309 Being able to do this is important for proper support of protoize,
9310 and also for generating precise symbolic debugging information
9311 which takes full account of the programmer's (typedef) vocabulary.
9313 Obviously, we don't want to generate a duplicate ..._TYPE node if
9314 the TYPE_DECL node that we are now processing really represents a
9315 standard built-in type. */
9318 set_underlying_type (tree x)
9320 if (x == error_mark_node)
9322 if (DECL_IS_BUILTIN (x))
9324 if (TYPE_NAME (TREE_TYPE (x)) == 0)
9325 TYPE_NAME (TREE_TYPE (x)) = x;
9327 else if (TREE_TYPE (x) != error_mark_node
9328 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
9330 tree tt = TREE_TYPE (x);
9331 DECL_ORIGINAL_TYPE (x) = tt;
9332 tt = build_variant_type_copy (tt);
9333 TYPE_STUB_DECL (tt) = TYPE_STUB_DECL (DECL_ORIGINAL_TYPE (x));
9335 TREE_USED (tt) = TREE_USED (x);
9340 /* Returns true if X is a typedef decl. */
9343 is_typedef_decl (tree x)
9345 return (x && TREE_CODE (x) == TYPE_DECL
9346 && DECL_ORIGINAL_TYPE (x) != NULL_TREE);
9349 /* Record the types used by the current global variable declaration
9350 being parsed, so that we can decide later to emit their debug info.
9351 Those types are in types_used_by_cur_var_decl, and we are going to
9352 store them in the types_used_by_vars_hash hash table.
9353 DECL is the declaration of the global variable that has been parsed. */
9356 record_types_used_by_current_var_decl (tree decl)
9358 gcc_assert (decl && DECL_P (decl) && TREE_STATIC (decl));
9360 if (types_used_by_cur_var_decl)
9363 for (node = types_used_by_cur_var_decl;
9365 node = TREE_CHAIN (node))
9367 tree type = TREE_PURPOSE (node);
9368 types_used_by_var_decl_insert (type, decl);
9370 types_used_by_cur_var_decl = NULL;
9374 /* The C and C++ parsers both use vectors to hold function arguments.
9375 For efficiency, we keep a cache of unused vectors. This is the
9378 typedef VEC(tree,gc)* tree_gc_vec;
9379 DEF_VEC_P(tree_gc_vec);
9380 DEF_VEC_ALLOC_P(tree_gc_vec,gc);
9381 static GTY((deletable)) VEC(tree_gc_vec,gc) *tree_vector_cache;
9383 /* Return a new vector from the cache. If the cache is empty,
9384 allocate a new vector. These vectors are GC'ed, so it is OK if the
9385 pointer is not released.. */
9388 make_tree_vector (void)
9390 if (!VEC_empty (tree_gc_vec, tree_vector_cache))
9391 return VEC_pop (tree_gc_vec, tree_vector_cache);
9394 /* Passing 0 to VEC_alloc returns NULL, and our callers require
9395 that we always return a non-NULL value. The vector code uses
9396 4 when growing a NULL vector, so we do too. */
9397 return VEC_alloc (tree, gc, 4);
9401 /* Release a vector of trees back to the cache. */
9404 release_tree_vector (VEC(tree,gc) *vec)
9408 VEC_truncate (tree, vec, 0);
9409 VEC_safe_push (tree_gc_vec, gc, tree_vector_cache, vec);
9413 /* Get a new tree vector holding a single tree. */
9416 make_tree_vector_single (tree t)
9418 VEC(tree,gc) *ret = make_tree_vector ();
9419 VEC_quick_push (tree, ret, t);
9423 /* Get a new tree vector which is a copy of an existing one. */
9426 make_tree_vector_copy (const VEC(tree,gc) *orig)
9432 ret = make_tree_vector ();
9433 VEC_reserve (tree, gc, ret, VEC_length (tree, orig));
9434 for (ix = 0; VEC_iterate (tree, orig, ix, t); ++ix)
9435 VEC_quick_push (tree, ret, t);
9439 #include "gt-c-common.h"