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
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"
40 #include "langhooks.h"
41 #include "tree-inline.h"
44 #include "diagnostic.h"
45 #include "tree-iterator.h"
47 #include "tree-mudflap.h"
51 #include "target-def.h"
53 #include "fixed-value.h"
56 cpp_reader *parse_in; /* Declared in c-pragma.h. */
58 /* The following symbols are subsumed in the c_global_trees array, and
59 listed here individually for documentation purposes.
61 INTEGER_TYPE and REAL_TYPE nodes for the standard data types.
63 tree short_integer_type_node;
64 tree long_integer_type_node;
65 tree long_long_integer_type_node;
67 tree short_unsigned_type_node;
68 tree long_unsigned_type_node;
69 tree long_long_unsigned_type_node;
71 tree truthvalue_type_node;
72 tree truthvalue_false_node;
73 tree truthvalue_true_node;
75 tree ptrdiff_type_node;
77 tree unsigned_char_type_node;
78 tree signed_char_type_node;
81 tree char16_type_node;
82 tree char32_type_node;
85 tree double_type_node;
86 tree long_double_type_node;
88 tree complex_integer_type_node;
89 tree complex_float_type_node;
90 tree complex_double_type_node;
91 tree complex_long_double_type_node;
93 tree dfloat32_type_node;
94 tree dfloat64_type_node;
95 tree_dfloat128_type_node;
100 tree intDI_type_node;
101 tree intTI_type_node;
103 tree unsigned_intQI_type_node;
104 tree unsigned_intHI_type_node;
105 tree unsigned_intSI_type_node;
106 tree unsigned_intDI_type_node;
107 tree unsigned_intTI_type_node;
109 tree widest_integer_literal_type_node;
110 tree widest_unsigned_literal_type_node;
112 Nodes for types `void *' and `const void *'.
114 tree ptr_type_node, const_ptr_type_node;
116 Nodes for types `char *' and `const char *'.
118 tree string_type_node, const_string_type_node;
120 Type `char[SOMENUMBER]'.
121 Used when an array of char is needed and the size is irrelevant.
123 tree char_array_type_node;
125 Type `int[SOMENUMBER]' or something like it.
126 Used when an array of int needed and the size is irrelevant.
128 tree int_array_type_node;
130 Type `wchar_t[SOMENUMBER]' or something like it.
131 Used when a wide string literal is created.
133 tree wchar_array_type_node;
135 Type `char16_t[SOMENUMBER]' or something like it.
136 Used when a UTF-16 string literal is created.
138 tree char16_array_type_node;
140 Type `char32_t[SOMENUMBER]' or something like it.
141 Used when a UTF-32 string literal is created.
143 tree char32_array_type_node;
145 Type `int ()' -- used for implicit declaration of functions.
147 tree default_function_type;
149 A VOID_TYPE node, packaged in a TREE_LIST.
153 The lazily created VAR_DECLs for __FUNCTION__, __PRETTY_FUNCTION__,
154 and __func__. (C doesn't generate __FUNCTION__ and__PRETTY_FUNCTION__
155 VAR_DECLS, but C++ does.)
157 tree function_name_decl_node;
158 tree pretty_function_name_decl_node;
159 tree c99_function_name_decl_node;
161 Stack of nested function name VAR_DECLs.
163 tree saved_function_name_decls;
167 tree c_global_trees[CTI_MAX];
169 /* Switches common to the C front ends. */
171 /* Nonzero if preprocessing only. */
173 int flag_preprocess_only;
175 /* Nonzero means don't output line number information. */
177 char flag_no_line_commands;
179 /* Nonzero causes -E output not to be done, but directives such as
180 #define that have side effects are still obeyed. */
184 /* Nonzero means dump macros in some fashion. */
186 char flag_dump_macros;
188 /* Nonzero means pass #include lines through to the output. */
190 char flag_dump_includes;
192 /* Nonzero means process PCH files while preprocessing. */
194 bool flag_pch_preprocess;
196 /* The file name to which we should write a precompiled header, or
197 NULL if no header will be written in this compile. */
199 const char *pch_file;
201 /* Nonzero if an ISO standard was selected. It rejects macros in the
205 /* Nonzero if -undef was given. It suppresses target built-in macros
209 /* Nonzero means don't recognize the non-ANSI builtin functions. */
213 /* Nonzero means don't recognize the non-ANSI builtin functions.
216 int flag_no_nonansi_builtin;
218 /* Nonzero means give `double' the same size as `float'. */
220 int flag_short_double;
222 /* Nonzero means give `wchar_t' the same size as `short'. */
224 int flag_short_wchar;
226 /* Nonzero means allow implicit conversions between vectors with
227 differing numbers of subparts and/or differing element types. */
228 int flag_lax_vector_conversions;
230 /* Nonzero means allow Microsoft extensions without warnings or errors. */
231 int flag_ms_extensions;
233 /* Nonzero means don't recognize the keyword `asm'. */
237 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
239 int flag_signed_bitfields = 1;
241 /* Warn about #pragma directives that are not recognized. */
243 int warn_unknown_pragmas; /* Tri state variable. */
245 /* Warn about format/argument anomalies in calls to formatted I/O functions
246 (*printf, *scanf, strftime, strfmon, etc.). */
250 /* Warn about using __null (as NULL in C++) as sentinel. For code compiled
251 with GCC this doesn't matter as __null is guaranteed to have the right
254 int warn_strict_null_sentinel;
256 /* Zero means that faster, ...NonNil variants of objc_msgSend...
257 calls will be used in ObjC; passing nil receivers to such calls
258 will most likely result in crashes. */
259 int flag_nil_receivers = 1;
261 /* Nonzero means that code generation will be altered to support
262 "zero-link" execution. This currently affects ObjC only, but may
263 affect other languages in the future. */
264 int flag_zero_link = 0;
266 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
267 unit. It will inform the ObjC runtime that class definition(s) herein
268 contained are to replace one(s) previously loaded. */
269 int flag_replace_objc_classes = 0;
271 /* C/ObjC language option variables. */
274 /* Nonzero means allow type mismatches in conditional expressions;
275 just make their values `void'. */
277 int flag_cond_mismatch;
279 /* Nonzero means enable C89 Amendment 1 features. */
283 /* Nonzero means use the ISO C99 dialect of C. */
287 /* Nonzero means that we have builtin functions, and main is an int. */
292 /* ObjC language option variables. */
295 /* Open and close the file for outputting class declarations, if
298 int flag_gen_declaration;
300 /* Tells the compiler that this is a special run. Do not perform any
301 compiling, instead we are to test some platform dependent features
302 and output a C header file with appropriate definitions. */
304 int print_struct_values;
306 /* Tells the compiler what is the constant string class for ObjC. */
308 const char *constant_string_class_name;
311 /* C++ language option variables. */
314 /* Nonzero means don't recognize any extension keywords. */
316 int flag_no_gnu_keywords;
318 /* Nonzero means do emit exported implementations of functions even if
319 they can be inlined. */
321 int flag_implement_inlines = 1;
323 /* Nonzero means that implicit instantiations will be emitted if needed. */
325 int flag_implicit_templates = 1;
327 /* Nonzero means that implicit instantiations of inline templates will be
328 emitted if needed, even if instantiations of non-inline templates
331 int flag_implicit_inline_templates = 1;
333 /* Nonzero means generate separate instantiation control files and
334 juggle them at link time. */
336 int flag_use_repository;
338 /* Nonzero if we want to issue diagnostics that the standard says are not
341 int flag_optional_diags = 1;
343 /* Nonzero means we should attempt to elide constructors when possible. */
345 int flag_elide_constructors = 1;
347 /* Nonzero means that member functions defined in class scope are
348 inline by default. */
350 int flag_default_inline = 1;
352 /* Controls whether compiler generates 'type descriptor' that give
353 run-time type information. */
357 /* Nonzero if we want to conserve space in the .o files. We do this
358 by putting uninitialized data and runtime initialized data into
359 .common instead of .data at the expense of not flagging multiple
362 int flag_conserve_space;
364 /* Nonzero if we want to obey access control semantics. */
366 int flag_access_control = 1;
368 /* Nonzero if we want to check the return value of new and avoid calling
369 constructors if it is a null pointer. */
373 /* The C++ dialect being used. C++98 is the default. */
375 enum cxx_dialect cxx_dialect = cxx98;
377 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
378 initialization variables.
379 0: Old rules, set by -fno-for-scope.
380 2: New ISO rules, set by -ffor-scope.
381 1: Try to implement new ISO rules, but with backup compatibility
382 (and warnings). This is the default, for now. */
384 int flag_new_for_scope = 1;
386 /* Nonzero if we want to emit defined symbols with common-like linkage as
387 weak symbols where possible, in order to conform to C++ semantics.
388 Otherwise, emit them as local symbols. */
392 /* 0 means we want the preprocessor to not emit line directives for
393 the current working directory. 1 means we want it to do it. -1
394 means we should decide depending on whether debugging information
395 is being emitted or not. */
397 int flag_working_directory = -1;
399 /* Nonzero to use __cxa_atexit, rather than atexit, to register
400 destructors for local statics and global objects. '2' means it has been
401 set nonzero as a default, not by a command-line flag. */
403 int flag_use_cxa_atexit = DEFAULT_USE_CXA_ATEXIT;
405 /* Nonzero to use __cxa_get_exception_ptr in C++ exception-handling
406 code. '2' means it has not been set explicitly on the command line. */
408 int flag_use_cxa_get_exception_ptr = 2;
410 /* Nonzero means to implement standard semantics for exception
411 specifications, calling unexpected if an exception is thrown that
412 doesn't match the specification. Zero means to treat them as
413 assertions and optimize accordingly, but not check them. */
415 int flag_enforce_eh_specs = 1;
417 /* Nonzero means to generate thread-safe code for initializing local
420 int flag_threadsafe_statics = 1;
422 /* Nonzero if we want to pretty-print template specializations as the
423 template signature followed by the arguments. */
425 int flag_pretty_templates = 1;
427 /* Nonzero means warn about implicit declarations. */
429 int warn_implicit = 1;
431 /* Maximum template instantiation depth. This limit is rather
432 arbitrary, but it exists to limit the time it takes to notice
433 infinite template instantiations. */
435 int max_tinst_depth = 500;
439 /* The elements of `ridpointers' are identifier nodes for the reserved
440 type names and storage classes. It is indexed by a RID_... value. */
443 tree (*make_fname_decl) (location_t, tree, int);
445 /* Nonzero means don't warn about problems that occur when the code is
447 int c_inhibit_evaluation_warnings;
449 /* Whether lexing has been completed, so subsequent preprocessor
450 errors should use the compiler's input_location. */
451 bool done_lexing = false;
453 /* Information about how a function name is generated. */
456 tree *const decl; /* pointer to the VAR_DECL. */
457 const unsigned rid; /* RID number for the identifier. */
458 const int pretty; /* How pretty is it? */
461 /* The three ways of getting then name of the current function. */
463 const struct fname_var_t fname_vars[] =
465 /* C99 compliant __func__, must be first. */
466 {&c99_function_name_decl_node, RID_C99_FUNCTION_NAME, 0},
467 /* GCC __FUNCTION__ compliant. */
468 {&function_name_decl_node, RID_FUNCTION_NAME, 0},
469 /* GCC __PRETTY_FUNCTION__ compliant. */
470 {&pretty_function_name_decl_node, RID_PRETTY_FUNCTION_NAME, 1},
474 static tree c_fully_fold_internal (tree expr, bool, bool *, bool *);
475 static tree check_case_value (tree);
476 static bool check_case_bounds (tree, tree, tree *, tree *);
478 static tree handle_packed_attribute (tree *, tree, tree, int, bool *);
479 static tree handle_nocommon_attribute (tree *, tree, tree, int, bool *);
480 static tree handle_common_attribute (tree *, tree, tree, int, bool *);
481 static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *);
482 static tree handle_hot_attribute (tree *, tree, tree, int, bool *);
483 static tree handle_cold_attribute (tree *, tree, tree, int, bool *);
484 static tree handle_noinline_attribute (tree *, tree, tree, int, bool *);
485 static tree handle_always_inline_attribute (tree *, tree, tree, int,
487 static tree handle_gnu_inline_attribute (tree *, tree, tree, int, bool *);
488 static tree handle_artificial_attribute (tree *, tree, tree, int, bool *);
489 static tree handle_flatten_attribute (tree *, tree, tree, int, bool *);
490 static tree handle_error_attribute (tree *, tree, tree, int, bool *);
491 static tree handle_used_attribute (tree *, tree, tree, int, bool *);
492 static tree handle_unused_attribute (tree *, tree, tree, int, bool *);
493 static tree handle_externally_visible_attribute (tree *, tree, tree, int,
495 static tree handle_const_attribute (tree *, tree, tree, int, bool *);
496 static tree handle_transparent_union_attribute (tree *, tree, tree,
498 static tree handle_constructor_attribute (tree *, tree, tree, int, bool *);
499 static tree handle_destructor_attribute (tree *, tree, tree, int, bool *);
500 static tree handle_mode_attribute (tree *, tree, tree, int, bool *);
501 static tree handle_section_attribute (tree *, tree, tree, int, bool *);
502 static tree handle_aligned_attribute (tree *, tree, tree, int, bool *);
503 static tree handle_weak_attribute (tree *, tree, tree, int, bool *) ;
504 static tree handle_alias_attribute (tree *, tree, tree, int, bool *);
505 static tree handle_weakref_attribute (tree *, tree, tree, int, bool *) ;
506 static tree handle_visibility_attribute (tree *, tree, tree, int,
508 static tree handle_tls_model_attribute (tree *, tree, tree, int,
510 static tree handle_no_instrument_function_attribute (tree *, tree,
512 static tree handle_malloc_attribute (tree *, tree, tree, int, bool *);
513 static tree handle_returns_twice_attribute (tree *, tree, tree, int, bool *);
514 static tree handle_no_limit_stack_attribute (tree *, tree, tree, int,
516 static tree handle_pure_attribute (tree *, tree, tree, int, bool *);
517 static tree handle_novops_attribute (tree *, tree, tree, int, bool *);
518 static tree handle_deprecated_attribute (tree *, tree, tree, int,
520 static tree handle_vector_size_attribute (tree *, tree, tree, int,
522 static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *);
523 static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *);
524 static tree handle_cleanup_attribute (tree *, tree, tree, int, bool *);
525 static tree handle_warn_unused_result_attribute (tree *, tree, tree, int,
527 static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *);
528 static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *);
529 static tree handle_alloc_size_attribute (tree *, tree, tree, int, bool *);
530 static tree handle_target_attribute (tree *, tree, tree, int, bool *);
531 static tree handle_optimize_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 { "__FUNCTION__", RID_FUNCTION_NAME, 0 },
567 { "__PRETTY_FUNCTION__", RID_PRETTY_FUNCTION_NAME, 0 },
568 { "__alignof", RID_ALIGNOF, 0 },
569 { "__alignof__", RID_ALIGNOF, 0 },
570 { "__asm", RID_ASM, 0 },
571 { "__asm__", RID_ASM, 0 },
572 { "__attribute", RID_ATTRIBUTE, 0 },
573 { "__attribute__", RID_ATTRIBUTE, 0 },
574 { "__builtin_choose_expr", RID_CHOOSE_EXPR, D_CONLY },
575 { "__builtin_offsetof", RID_OFFSETOF, 0 },
576 { "__builtin_types_compatible_p", RID_TYPES_COMPATIBLE_P, D_CONLY },
577 { "__builtin_va_arg", RID_VA_ARG, 0 },
578 { "__complex", RID_COMPLEX, 0 },
579 { "__complex__", RID_COMPLEX, 0 },
580 { "__const", RID_CONST, 0 },
581 { "__const__", RID_CONST, 0 },
582 { "__decltype", RID_DECLTYPE, D_CXXONLY },
583 { "__extension__", RID_EXTENSION, 0 },
584 { "__func__", RID_C99_FUNCTION_NAME, 0 },
585 { "__has_nothrow_assign", RID_HAS_NOTHROW_ASSIGN, D_CXXONLY },
586 { "__has_nothrow_constructor", RID_HAS_NOTHROW_CONSTRUCTOR, D_CXXONLY },
587 { "__has_nothrow_copy", RID_HAS_NOTHROW_COPY, D_CXXONLY },
588 { "__has_trivial_assign", RID_HAS_TRIVIAL_ASSIGN, D_CXXONLY },
589 { "__has_trivial_constructor", RID_HAS_TRIVIAL_CONSTRUCTOR, D_CXXONLY },
590 { "__has_trivial_copy", RID_HAS_TRIVIAL_COPY, D_CXXONLY },
591 { "__has_trivial_destructor", RID_HAS_TRIVIAL_DESTRUCTOR, D_CXXONLY },
592 { "__has_virtual_destructor", RID_HAS_VIRTUAL_DESTRUCTOR, D_CXXONLY },
593 { "__is_abstract", RID_IS_ABSTRACT, D_CXXONLY },
594 { "__is_base_of", RID_IS_BASE_OF, D_CXXONLY },
595 { "__is_class", RID_IS_CLASS, D_CXXONLY },
596 { "__is_convertible_to", RID_IS_CONVERTIBLE_TO, D_CXXONLY },
597 { "__is_empty", RID_IS_EMPTY, D_CXXONLY },
598 { "__is_enum", RID_IS_ENUM, D_CXXONLY },
599 { "__is_pod", RID_IS_POD, D_CXXONLY },
600 { "__is_polymorphic", RID_IS_POLYMORPHIC, D_CXXONLY },
601 { "__is_union", RID_IS_UNION, D_CXXONLY },
602 { "__imag", RID_IMAGPART, 0 },
603 { "__imag__", RID_IMAGPART, 0 },
604 { "__inline", RID_INLINE, 0 },
605 { "__inline__", RID_INLINE, 0 },
606 { "__label__", RID_LABEL, 0 },
607 { "__null", RID_NULL, 0 },
608 { "__real", RID_REALPART, 0 },
609 { "__real__", RID_REALPART, 0 },
610 { "__restrict", RID_RESTRICT, 0 },
611 { "__restrict__", RID_RESTRICT, 0 },
612 { "__signed", RID_SIGNED, 0 },
613 { "__signed__", RID_SIGNED, 0 },
614 { "__thread", RID_THREAD, 0 },
615 { "__typeof", RID_TYPEOF, 0 },
616 { "__typeof__", RID_TYPEOF, 0 },
617 { "__volatile", RID_VOLATILE, 0 },
618 { "__volatile__", RID_VOLATILE, 0 },
619 { "asm", RID_ASM, D_ASM },
620 { "auto", RID_AUTO, 0 },
621 { "bool", RID_BOOL, D_CXXONLY | D_CXXWARN },
622 { "break", RID_BREAK, 0 },
623 { "case", RID_CASE, 0 },
624 { "catch", RID_CATCH, D_CXX_OBJC | D_CXXWARN },
625 { "char", RID_CHAR, 0 },
626 { "char16_t", RID_CHAR16, D_CXXONLY | D_CXX0X | D_CXXWARN },
627 { "char32_t", RID_CHAR32, D_CXXONLY | D_CXX0X | D_CXXWARN },
628 { "class", RID_CLASS, D_CXX_OBJC | D_CXXWARN },
629 { "const", RID_CONST, 0 },
630 { "const_cast", RID_CONSTCAST, D_CXXONLY | D_CXXWARN },
631 { "continue", RID_CONTINUE, 0 },
632 { "decltype", RID_DECLTYPE, D_CXXONLY | D_CXX0X | D_CXXWARN },
633 { "default", RID_DEFAULT, 0 },
634 { "delete", RID_DELETE, D_CXXONLY | D_CXXWARN },
636 { "double", RID_DOUBLE, 0 },
637 { "dynamic_cast", RID_DYNCAST, D_CXXONLY | D_CXXWARN },
638 { "else", RID_ELSE, 0 },
639 { "enum", RID_ENUM, 0 },
640 { "explicit", RID_EXPLICIT, D_CXXONLY | D_CXXWARN },
641 { "export", RID_EXPORT, D_CXXONLY | D_CXXWARN },
642 { "extern", RID_EXTERN, 0 },
643 { "false", RID_FALSE, D_CXXONLY | D_CXXWARN },
644 { "float", RID_FLOAT, 0 },
645 { "for", RID_FOR, 0 },
646 { "friend", RID_FRIEND, D_CXXONLY | D_CXXWARN },
647 { "goto", RID_GOTO, 0 },
649 { "inline", RID_INLINE, D_EXT89 },
650 { "int", RID_INT, 0 },
651 { "long", RID_LONG, 0 },
652 { "mutable", RID_MUTABLE, D_CXXONLY | D_CXXWARN },
653 { "namespace", RID_NAMESPACE, D_CXXONLY | D_CXXWARN },
654 { "new", RID_NEW, D_CXXONLY | D_CXXWARN },
655 { "operator", RID_OPERATOR, D_CXXONLY | D_CXXWARN },
656 { "private", RID_PRIVATE, D_CXX_OBJC | D_CXXWARN },
657 { "protected", RID_PROTECTED, D_CXX_OBJC | D_CXXWARN },
658 { "public", RID_PUBLIC, D_CXX_OBJC | D_CXXWARN },
659 { "register", RID_REGISTER, 0 },
660 { "reinterpret_cast", RID_REINTCAST, D_CXXONLY | D_CXXWARN },
661 { "restrict", RID_RESTRICT, D_CONLY | D_C99 },
662 { "return", RID_RETURN, 0 },
663 { "short", RID_SHORT, 0 },
664 { "signed", RID_SIGNED, 0 },
665 { "sizeof", RID_SIZEOF, 0 },
666 { "static", RID_STATIC, 0 },
667 { "static_assert", RID_STATIC_ASSERT, D_CXXONLY | D_CXX0X | D_CXXWARN },
668 { "static_cast", RID_STATCAST, D_CXXONLY | D_CXXWARN },
669 { "struct", RID_STRUCT, 0 },
670 { "switch", RID_SWITCH, 0 },
671 { "template", RID_TEMPLATE, D_CXXONLY | D_CXXWARN },
672 { "this", RID_THIS, D_CXXONLY | D_CXXWARN },
673 { "throw", RID_THROW, D_CXX_OBJC | D_CXXWARN },
674 { "true", RID_TRUE, D_CXXONLY | D_CXXWARN },
675 { "try", RID_TRY, D_CXX_OBJC | D_CXXWARN },
676 { "typedef", RID_TYPEDEF, 0 },
677 { "typename", RID_TYPENAME, D_CXXONLY | D_CXXWARN },
678 { "typeid", RID_TYPEID, D_CXXONLY | D_CXXWARN },
679 { "typeof", RID_TYPEOF, D_ASM | D_EXT },
680 { "union", RID_UNION, 0 },
681 { "unsigned", RID_UNSIGNED, 0 },
682 { "using", RID_USING, D_CXXONLY | D_CXXWARN },
683 { "virtual", RID_VIRTUAL, D_CXXONLY | D_CXXWARN },
684 { "void", RID_VOID, 0 },
685 { "volatile", RID_VOLATILE, 0 },
686 { "wchar_t", RID_WCHAR, D_CXXONLY },
687 { "while", RID_WHILE, 0 },
688 /* These Objective-C keywords are recognized only immediately after
690 { "compatibility_alias", RID_AT_ALIAS, D_OBJC },
691 { "defs", RID_AT_DEFS, D_OBJC },
692 { "encode", RID_AT_ENCODE, D_OBJC },
693 { "end", RID_AT_END, D_OBJC },
694 { "implementation", RID_AT_IMPLEMENTATION, D_OBJC },
695 { "interface", RID_AT_INTERFACE, D_OBJC },
696 { "protocol", RID_AT_PROTOCOL, D_OBJC },
697 { "selector", RID_AT_SELECTOR, D_OBJC },
698 { "finally", RID_AT_FINALLY, D_OBJC },
699 { "synchronized", RID_AT_SYNCHRONIZED, D_OBJC },
700 /* These are recognized only in protocol-qualifier context
702 { "bycopy", RID_BYCOPY, D_OBJC },
703 { "byref", RID_BYREF, D_OBJC },
704 { "in", RID_IN, D_OBJC },
705 { "inout", RID_INOUT, D_OBJC },
706 { "oneway", RID_ONEWAY, D_OBJC },
707 { "out", RID_OUT, D_OBJC },
710 const unsigned int num_c_common_reswords =
711 sizeof c_common_reswords / sizeof (struct c_common_resword);
713 /* Table of machine-independent attributes common to all C-like languages. */
714 const struct attribute_spec c_common_attribute_table[] =
716 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
717 { "packed", 0, 0, false, false, false,
718 handle_packed_attribute },
719 { "nocommon", 0, 0, true, false, false,
720 handle_nocommon_attribute },
721 { "common", 0, 0, true, false, false,
722 handle_common_attribute },
723 /* FIXME: logically, noreturn attributes should be listed as
724 "false, true, true" and apply to function types. But implementing this
725 would require all the places in the compiler that use TREE_THIS_VOLATILE
726 on a decl to identify non-returning functions to be located and fixed
727 to check the function type instead. */
728 { "noreturn", 0, 0, true, false, false,
729 handle_noreturn_attribute },
730 { "volatile", 0, 0, true, false, false,
731 handle_noreturn_attribute },
732 { "noinline", 0, 0, true, false, false,
733 handle_noinline_attribute },
734 { "always_inline", 0, 0, true, false, false,
735 handle_always_inline_attribute },
736 { "gnu_inline", 0, 0, true, false, false,
737 handle_gnu_inline_attribute },
738 { "artificial", 0, 0, true, false, false,
739 handle_artificial_attribute },
740 { "flatten", 0, 0, true, false, false,
741 handle_flatten_attribute },
742 { "used", 0, 0, true, false, false,
743 handle_used_attribute },
744 { "unused", 0, 0, false, false, false,
745 handle_unused_attribute },
746 { "externally_visible", 0, 0, true, false, false,
747 handle_externally_visible_attribute },
748 /* The same comments as for noreturn attributes apply to const ones. */
749 { "const", 0, 0, true, false, false,
750 handle_const_attribute },
751 { "transparent_union", 0, 0, false, false, false,
752 handle_transparent_union_attribute },
753 { "constructor", 0, 1, true, false, false,
754 handle_constructor_attribute },
755 { "destructor", 0, 1, true, false, false,
756 handle_destructor_attribute },
757 { "mode", 1, 1, false, true, false,
758 handle_mode_attribute },
759 { "section", 1, 1, true, false, false,
760 handle_section_attribute },
761 { "aligned", 0, 1, false, false, false,
762 handle_aligned_attribute },
763 { "weak", 0, 0, true, false, false,
764 handle_weak_attribute },
765 { "alias", 1, 1, true, false, false,
766 handle_alias_attribute },
767 { "weakref", 0, 1, true, false, false,
768 handle_weakref_attribute },
769 { "no_instrument_function", 0, 0, true, false, false,
770 handle_no_instrument_function_attribute },
771 { "malloc", 0, 0, true, false, false,
772 handle_malloc_attribute },
773 { "returns_twice", 0, 0, true, false, false,
774 handle_returns_twice_attribute },
775 { "no_stack_limit", 0, 0, true, false, false,
776 handle_no_limit_stack_attribute },
777 { "pure", 0, 0, true, false, false,
778 handle_pure_attribute },
779 /* For internal use (marking of builtins) only. The name contains space
780 to prevent its usage in source code. */
781 { "no vops", 0, 0, true, false, false,
782 handle_novops_attribute },
783 { "deprecated", 0, 1, false, false, false,
784 handle_deprecated_attribute },
785 { "vector_size", 1, 1, false, true, false,
786 handle_vector_size_attribute },
787 { "visibility", 1, 1, false, false, false,
788 handle_visibility_attribute },
789 { "tls_model", 1, 1, true, false, false,
790 handle_tls_model_attribute },
791 { "nonnull", 0, -1, false, true, true,
792 handle_nonnull_attribute },
793 { "nothrow", 0, 0, true, false, false,
794 handle_nothrow_attribute },
795 { "may_alias", 0, 0, false, true, false, NULL },
796 { "cleanup", 1, 1, true, false, false,
797 handle_cleanup_attribute },
798 { "warn_unused_result", 0, 0, false, true, true,
799 handle_warn_unused_result_attribute },
800 { "sentinel", 0, 1, false, true, true,
801 handle_sentinel_attribute },
802 /* For internal use (marking of builtins) only. The name contains space
803 to prevent its usage in source code. */
804 { "type generic", 0, 0, false, true, true,
805 handle_type_generic_attribute },
806 { "alloc_size", 1, 2, false, true, true,
807 handle_alloc_size_attribute },
808 { "cold", 0, 0, true, false, false,
809 handle_cold_attribute },
810 { "hot", 0, 0, true, false, false,
811 handle_hot_attribute },
812 { "warning", 1, 1, true, false, false,
813 handle_error_attribute },
814 { "error", 1, 1, true, false, false,
815 handle_error_attribute },
816 { "target", 1, -1, true, false, false,
817 handle_target_attribute },
818 { "optimize", 1, -1, true, false, false,
819 handle_optimize_attribute },
820 { NULL, 0, 0, false, false, false, NULL }
823 /* Give the specifications for the format attributes, used by C and all
826 const struct attribute_spec c_common_format_attribute_table[] =
828 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
829 { "format", 3, 3, false, true, true,
830 handle_format_attribute },
831 { "format_arg", 1, 1, false, true, true,
832 handle_format_arg_attribute },
833 { NULL, 0, 0, false, false, false, NULL }
836 /* Push current bindings for the function name VAR_DECLS. */
839 start_fname_decls (void)
842 tree saved = NULL_TREE;
844 for (ix = 0; fname_vars[ix].decl; ix++)
846 tree decl = *fname_vars[ix].decl;
850 saved = tree_cons (decl, build_int_cst (NULL_TREE, ix), saved);
851 *fname_vars[ix].decl = NULL_TREE;
854 if (saved || saved_function_name_decls)
855 /* Normally they'll have been NULL, so only push if we've got a
856 stack, or they are non-NULL. */
857 saved_function_name_decls = tree_cons (saved, NULL_TREE,
858 saved_function_name_decls);
861 /* Finish up the current bindings, adding them into the current function's
862 statement tree. This must be done _before_ finish_stmt_tree is called.
863 If there is no current function, we must be at file scope and no statements
864 are involved. Pop the previous bindings. */
867 finish_fname_decls (void)
870 tree stmts = NULL_TREE;
871 tree stack = saved_function_name_decls;
873 for (; stack && TREE_VALUE (stack); stack = TREE_CHAIN (stack))
874 append_to_statement_list (TREE_VALUE (stack), &stmts);
878 tree *bodyp = &DECL_SAVED_TREE (current_function_decl);
880 if (TREE_CODE (*bodyp) == BIND_EXPR)
881 bodyp = &BIND_EXPR_BODY (*bodyp);
883 append_to_statement_list_force (*bodyp, &stmts);
887 for (ix = 0; fname_vars[ix].decl; ix++)
888 *fname_vars[ix].decl = NULL_TREE;
892 /* We had saved values, restore them. */
895 for (saved = TREE_PURPOSE (stack); saved; saved = TREE_CHAIN (saved))
897 tree decl = TREE_PURPOSE (saved);
898 unsigned ix = TREE_INT_CST_LOW (TREE_VALUE (saved));
900 *fname_vars[ix].decl = decl;
902 stack = TREE_CHAIN (stack);
904 saved_function_name_decls = stack;
907 /* Return the text name of the current function, suitably prettified
908 by PRETTY_P. Return string must be freed by caller. */
911 fname_as_string (int pretty_p)
913 const char *name = "top level";
916 cpp_string cstr = { 0, 0 }, strname;
924 if (current_function_decl)
925 name = lang_hooks.decl_printable_name (current_function_decl, vrb);
927 len = strlen (name) + 3; /* Two for '"'s. One for NULL. */
929 namep = XNEWVEC (char, len);
930 snprintf (namep, len, "\"%s\"", name);
931 strname.text = (unsigned char *) namep;
932 strname.len = len - 1;
934 if (cpp_interpret_string (parse_in, &strname, 1, &cstr, CPP_STRING))
937 return (const char *) cstr.text;
943 /* Return the VAR_DECL for a const char array naming the current
944 function. If the VAR_DECL has not yet been created, create it
945 now. RID indicates how it should be formatted and IDENTIFIER_NODE
946 ID is its name (unfortunately C and C++ hold the RID values of
947 keywords in different places, so we can't derive RID from ID in
948 this language independent code. LOC is the location of the
952 fname_decl (location_t loc, unsigned int rid, tree id)
955 tree decl = NULL_TREE;
957 for (ix = 0; fname_vars[ix].decl; ix++)
958 if (fname_vars[ix].rid == rid)
961 decl = *fname_vars[ix].decl;
964 /* If a tree is built here, it would normally have the lineno of
965 the current statement. Later this tree will be moved to the
966 beginning of the function and this line number will be wrong.
967 To avoid this problem set the lineno to 0 here; that prevents
968 it from appearing in the RTL. */
970 location_t saved_location = input_location;
971 input_location = UNKNOWN_LOCATION;
973 stmts = push_stmt_list ();
974 decl = (*make_fname_decl) (loc, id, fname_vars[ix].pretty);
975 stmts = pop_stmt_list (stmts);
976 if (!IS_EMPTY_STMT (stmts))
977 saved_function_name_decls
978 = tree_cons (decl, stmts, saved_function_name_decls);
979 *fname_vars[ix].decl = decl;
980 input_location = saved_location;
982 if (!ix && !current_function_decl)
983 pedwarn (loc, 0, "%qD is not defined outside of function scope", decl);
988 /* Given a STRING_CST, give it a suitable array-of-chars data type. */
991 fix_string_type (tree value)
993 int length = TREE_STRING_LENGTH (value);
995 tree e_type, i_type, a_type;
997 /* Compute the number of elements, for the array type. */
998 if (TREE_TYPE (value) == char_array_type_node || !TREE_TYPE (value))
1001 e_type = char_type_node;
1003 else if (TREE_TYPE (value) == char16_array_type_node)
1005 nchars = length / (TYPE_PRECISION (char16_type_node) / BITS_PER_UNIT);
1006 e_type = char16_type_node;
1008 else if (TREE_TYPE (value) == char32_array_type_node)
1010 nchars = length / (TYPE_PRECISION (char32_type_node) / BITS_PER_UNIT);
1011 e_type = char32_type_node;
1015 nchars = length / (TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT);
1016 e_type = wchar_type_node;
1019 /* C89 2.2.4.1, C99 5.2.4.1 (Translation limits). The analogous
1020 limit in C++98 Annex B is very large (65536) and is not normative,
1021 so we do not diagnose it (warn_overlength_strings is forced off
1022 in c_common_post_options). */
1023 if (warn_overlength_strings)
1025 const int nchars_max = flag_isoc99 ? 4095 : 509;
1026 const int relevant_std = flag_isoc99 ? 99 : 90;
1027 if (nchars - 1 > nchars_max)
1028 /* Translators: The %d after 'ISO C' will be 90 or 99. Do not
1029 separate the %d from the 'C'. 'ISO' should not be
1030 translated, but it may be moved after 'C%d' in languages
1031 where modifiers follow nouns. */
1032 pedwarn (input_location, OPT_Woverlength_strings,
1033 "string length %qd is greater than the length %qd "
1034 "ISO C%d compilers are required to support",
1035 nchars - 1, nchars_max, relevant_std);
1038 /* Create the array type for the string constant. The ISO C++
1039 standard says that a string literal has type `const char[N]' or
1040 `const wchar_t[N]'. We use the same logic when invoked as a C
1041 front-end with -Wwrite-strings.
1042 ??? We should change the type of an expression depending on the
1043 state of a warning flag. We should just be warning -- see how
1044 this is handled in the C++ front-end for the deprecated implicit
1045 conversion from string literals to `char*' or `wchar_t*'.
1047 The C++ front end relies on TYPE_MAIN_VARIANT of a cv-qualified
1048 array type being the unqualified version of that type.
1049 Therefore, if we are constructing an array of const char, we must
1050 construct the matching unqualified array type first. The C front
1051 end does not require this, but it does no harm, so we do it
1053 i_type = build_index_type (build_int_cst (NULL_TREE, nchars - 1));
1054 a_type = build_array_type (e_type, i_type);
1055 if (c_dialect_cxx() || warn_write_strings)
1056 a_type = c_build_qualified_type (a_type, TYPE_QUAL_CONST);
1058 TREE_TYPE (value) = a_type;
1059 TREE_CONSTANT (value) = 1;
1060 TREE_READONLY (value) = 1;
1061 TREE_STATIC (value) = 1;
1065 /* Fully fold EXPR, an expression that was not folded (beyond integer
1066 constant expressions and null pointer constants) when being built
1067 up. If IN_INIT, this is in a static initializer and certain
1068 changes are made to the folding done. Clear *MAYBE_CONST if
1069 MAYBE_CONST is not NULL and EXPR is definitely not a constant
1070 expression because it contains an evaluated operator (in C99) or an
1071 operator outside of sizeof returning an integer constant (in C90)
1072 not permitted in constant expressions, or because it contains an
1073 evaluated arithmetic overflow. (*MAYBE_CONST should typically be
1074 set to true by callers before calling this function.) Return the
1075 folded expression. Function arguments have already been folded
1076 before calling this function, as have the contents of SAVE_EXPR,
1077 TARGET_EXPR, BIND_EXPR, VA_ARG_EXPR, OBJ_TYPE_REF and
1078 C_MAYBE_CONST_EXPR. */
1081 c_fully_fold (tree expr, bool in_init, bool *maybe_const)
1084 tree eptype = NULL_TREE;
1086 bool maybe_const_itself = true;
1088 /* This function is not relevant to C++ because C++ folds while
1089 parsing, and may need changes to be correct for C++ when C++
1090 stops folding while parsing. */
1091 if (c_dialect_cxx ())
1095 maybe_const = &dummy;
1096 if (TREE_CODE (expr) == EXCESS_PRECISION_EXPR)
1098 eptype = TREE_TYPE (expr);
1099 expr = TREE_OPERAND (expr, 0);
1101 ret = c_fully_fold_internal (expr, in_init, maybe_const,
1102 &maybe_const_itself);
1104 ret = fold_convert (eptype, ret);
1105 *maybe_const &= maybe_const_itself;
1109 /* Internal helper for c_fully_fold. EXPR and IN_INIT are as for
1110 c_fully_fold. *MAYBE_CONST_OPERANDS is cleared because of operands
1111 not permitted, while *MAYBE_CONST_ITSELF is cleared because of
1112 arithmetic overflow (for C90, *MAYBE_CONST_OPERANDS is carried from
1113 both evaluated and unevaluated subexpressions while
1114 *MAYBE_CONST_ITSELF is carried from only evaluated
1118 c_fully_fold_internal (tree expr, bool in_init, bool *maybe_const_operands,
1119 bool *maybe_const_itself)
1122 enum tree_code code = TREE_CODE (expr);
1123 enum tree_code_class kind = TREE_CODE_CLASS (code);
1124 location_t loc = EXPR_LOCATION (expr);
1125 tree op0, op1, op2, op3;
1126 tree orig_op0, orig_op1, orig_op2;
1127 bool op0_const = true, op1_const = true, op2_const = true;
1128 bool op0_const_self = true, op1_const_self = true, op2_const_self = true;
1129 bool nowarning = TREE_NO_WARNING (expr);
1131 /* This function is not relevant to C++ because C++ folds while
1132 parsing, and may need changes to be correct for C++ when C++
1133 stops folding while parsing. */
1134 if (c_dialect_cxx ())
1137 /* Constants, declarations, statements, errors, SAVE_EXPRs and
1138 anything else not counted as an expression cannot usefully be
1139 folded further at this point. */
1140 if (!IS_EXPR_CODE_CLASS (kind)
1141 || kind == tcc_statement
1142 || code == SAVE_EXPR)
1145 /* Operands of variable-length expressions (function calls) have
1146 already been folded, as have __builtin_* function calls, and such
1147 expressions cannot occur in constant expressions. */
1148 if (kind == tcc_vl_exp)
1150 *maybe_const_operands = false;
1155 if (code == C_MAYBE_CONST_EXPR)
1157 tree pre = C_MAYBE_CONST_EXPR_PRE (expr);
1158 tree inner = C_MAYBE_CONST_EXPR_EXPR (expr);
1159 if (C_MAYBE_CONST_EXPR_NON_CONST (expr))
1160 *maybe_const_operands = false;
1161 if (C_MAYBE_CONST_EXPR_INT_OPERANDS (expr))
1162 *maybe_const_itself = false;
1163 if (pre && !in_init)
1164 ret = build2 (COMPOUND_EXPR, TREE_TYPE (expr), pre, inner);
1170 /* Assignment, increment, decrement, function call and comma
1171 operators, and statement expressions, cannot occur in constant
1172 expressions if evaluated / outside of sizeof. (Function calls
1173 were handled above, though VA_ARG_EXPR is treated like a function
1174 call here, and statement expressions are handled through
1175 C_MAYBE_CONST_EXPR to avoid folding inside them.) */
1179 case PREDECREMENT_EXPR:
1180 case PREINCREMENT_EXPR:
1181 case POSTDECREMENT_EXPR:
1182 case POSTINCREMENT_EXPR:
1184 *maybe_const_operands = false;
1191 *maybe_const_operands = false;
1199 /* Fold individual tree codes as appropriate. */
1202 case COMPOUND_LITERAL_EXPR:
1203 /* Any non-constancy will have been marked in a containing
1204 C_MAYBE_CONST_EXPR; there is no more folding to do here. */
1208 orig_op0 = op0 = TREE_OPERAND (expr, 0);
1209 op1 = TREE_OPERAND (expr, 1);
1210 op2 = TREE_OPERAND (expr, 2);
1211 op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands,
1212 maybe_const_itself);
1213 if (op0 != orig_op0)
1214 ret = build3 (COMPONENT_REF, TREE_TYPE (expr), op0, op1, op2);
1217 TREE_READONLY (ret) = TREE_READONLY (expr);
1218 TREE_THIS_VOLATILE (ret) = TREE_THIS_VOLATILE (expr);
1223 orig_op0 = op0 = TREE_OPERAND (expr, 0);
1224 orig_op1 = op1 = TREE_OPERAND (expr, 1);
1225 op2 = TREE_OPERAND (expr, 2);
1226 op3 = TREE_OPERAND (expr, 3);
1227 op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands,
1228 maybe_const_itself);
1229 op1 = c_fully_fold_internal (op1, in_init, maybe_const_operands,
1230 maybe_const_itself);
1231 op1 = decl_constant_value_for_optimization (op1);
1232 if (op0 != orig_op0 || op1 != orig_op1)
1233 ret = build4 (ARRAY_REF, TREE_TYPE (expr), op0, op1, op2, op3);
1236 TREE_READONLY (ret) = TREE_READONLY (expr);
1237 TREE_SIDE_EFFECTS (ret) = TREE_SIDE_EFFECTS (expr);
1238 TREE_THIS_VOLATILE (ret) = TREE_THIS_VOLATILE (expr);
1245 case PREDECREMENT_EXPR:
1246 case PREINCREMENT_EXPR:
1247 case POSTDECREMENT_EXPR:
1248 case POSTINCREMENT_EXPR:
1252 case POINTER_PLUS_EXPR:
1253 case TRUNC_DIV_EXPR:
1255 case FLOOR_DIV_EXPR:
1256 case TRUNC_MOD_EXPR:
1258 case EXACT_DIV_EXPR:
1271 case TRUTH_AND_EXPR:
1273 case TRUTH_XOR_EXPR:
1274 case UNORDERED_EXPR:
1281 /* Binary operations evaluating both arguments (increment and
1282 decrement are binary internally in GCC). */
1283 orig_op0 = op0 = TREE_OPERAND (expr, 0);
1284 orig_op1 = op1 = TREE_OPERAND (expr, 1);
1285 op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands,
1286 maybe_const_itself);
1287 if (code != MODIFY_EXPR
1288 && code != PREDECREMENT_EXPR
1289 && code != PREINCREMENT_EXPR
1290 && code != POSTDECREMENT_EXPR
1291 && code != POSTINCREMENT_EXPR)
1292 op0 = decl_constant_value_for_optimization (op0);
1293 /* The RHS of a MODIFY_EXPR was fully folded when building that
1294 expression for the sake of conversion warnings. */
1295 if (code != MODIFY_EXPR)
1296 op1 = c_fully_fold_internal (op1, in_init, maybe_const_operands,
1297 maybe_const_itself);
1298 op1 = decl_constant_value_for_optimization (op1);
1299 if (op0 != orig_op0 || op1 != orig_op1 || in_init)
1301 ? fold_build2_initializer (code, TREE_TYPE (expr), op0, op1)
1302 : fold_build2 (code, TREE_TYPE (expr), op0, op1);
1308 case FIX_TRUNC_EXPR:
1311 case NON_LVALUE_EXPR:
1314 case TRUTH_NOT_EXPR:
1319 /* Unary operations. */
1320 orig_op0 = op0 = TREE_OPERAND (expr, 0);
1321 op0 = c_fully_fold_internal (op0, in_init, maybe_const_operands,
1322 maybe_const_itself);
1323 if (code != ADDR_EXPR && code != REALPART_EXPR && code != IMAGPART_EXPR)
1324 op0 = decl_constant_value_for_optimization (op0);
1325 if (op0 != orig_op0 || in_init)
1327 ? fold_build1_initializer (code, TREE_TYPE (expr), op0)
1328 : fold_build1 (code, TREE_TYPE (expr), op0);
1331 if (code == INDIRECT_REF
1333 && TREE_CODE (ret) == INDIRECT_REF)
1335 TREE_READONLY (ret) = TREE_READONLY (expr);
1336 TREE_SIDE_EFFECTS (ret) = TREE_SIDE_EFFECTS (expr);
1337 TREE_THIS_VOLATILE (ret) = TREE_THIS_VOLATILE (expr);
1341 case TRUTH_ANDIF_EXPR:
1342 case TRUTH_ORIF_EXPR:
1343 /* Binary operations not necessarily evaluating both
1345 orig_op0 = op0 = TREE_OPERAND (expr, 0);
1346 orig_op1 = op1 = TREE_OPERAND (expr, 1);
1347 op0 = c_fully_fold_internal (op0, in_init, &op0_const, &op0_const_self);
1348 op1 = c_fully_fold_internal (op1, in_init, &op1_const, &op1_const_self);
1349 if (op0 != orig_op0 || op1 != orig_op1 || in_init)
1351 ? fold_build2_initializer (code, TREE_TYPE (expr), op0, op1)
1352 : fold_build2 (code, TREE_TYPE (expr), op0, op1);
1355 *maybe_const_operands &= op0_const;
1356 *maybe_const_itself &= op0_const_self;
1360 && (code == TRUTH_ANDIF_EXPR
1361 ? op0 == truthvalue_false_node
1362 : op0 == truthvalue_true_node)))
1363 *maybe_const_operands &= op1_const;
1366 && (code == TRUTH_ANDIF_EXPR
1367 ? op0 == truthvalue_false_node
1368 : op0 == truthvalue_true_node)))
1369 *maybe_const_itself &= op1_const_self;
1373 orig_op0 = op0 = TREE_OPERAND (expr, 0);
1374 orig_op1 = op1 = TREE_OPERAND (expr, 1);
1375 orig_op2 = op2 = TREE_OPERAND (expr, 2);
1376 op0 = c_fully_fold_internal (op0, in_init, &op0_const, &op0_const_self);
1377 op1 = c_fully_fold_internal (op1, in_init, &op1_const, &op1_const_self);
1378 op2 = c_fully_fold_internal (op2, in_init, &op2_const, &op2_const_self);
1379 if (op0 != orig_op0 || op1 != orig_op1 || op2 != orig_op2)
1380 ret = fold_build3 (code, TREE_TYPE (expr), op0, op1, op2);
1383 *maybe_const_operands &= op0_const;
1384 *maybe_const_itself &= op0_const_self;
1388 && op0 == truthvalue_false_node))
1389 *maybe_const_operands &= op1_const;
1392 && op0 == truthvalue_false_node))
1393 *maybe_const_itself &= op1_const_self;
1397 && op0 == truthvalue_true_node))
1398 *maybe_const_operands &= op2_const;
1401 && op0 == truthvalue_true_node))
1402 *maybe_const_itself &= op2_const_self;
1405 case EXCESS_PRECISION_EXPR:
1406 /* Each case where an operand with excess precision may be
1407 encountered must remove the EXCESS_PRECISION_EXPR around
1408 inner operands and possibly put one around the whole
1409 expression or possibly convert to the semantic type (which
1410 c_fully_fold does); we cannot tell at this stage which is
1411 appropriate in any particular case. */
1415 /* Various codes may appear through folding built-in functions
1416 and their arguments. */
1421 /* Some folding may introduce NON_LVALUE_EXPRs; all lvalue checks
1422 have been done by this point, so remove them again. */
1423 nowarning |= TREE_NO_WARNING (ret);
1424 STRIP_TYPE_NOPS (ret);
1425 if (nowarning && !TREE_NO_WARNING (ret))
1427 if (!CAN_HAVE_LOCATION_P (ret))
1428 ret = build1 (NOP_EXPR, TREE_TYPE (ret), ret);
1429 TREE_NO_WARNING (ret) = 1;
1432 protected_set_expr_location (ret, loc);
1436 /* If not optimizing, EXP is not a VAR_DECL, or EXP has array type,
1437 return EXP. Otherwise, return either EXP or its known constant
1438 value (if it has one), but return EXP if EXP has mode BLKmode. ???
1439 Is the BLKmode test appropriate? */
1442 decl_constant_value_for_optimization (tree exp)
1446 /* This function is only used by C, for c_fully_fold and other
1447 optimization, and may not be correct for C++. */
1448 if (c_dialect_cxx ())
1452 || TREE_CODE (exp) != VAR_DECL
1453 || TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
1454 || DECL_MODE (exp) == BLKmode)
1457 ret = decl_constant_value (exp);
1458 /* Avoid unwanted tree sharing between the initializer and current
1459 function's body where the tree can be modified e.g. by the
1461 if (ret != exp && TREE_STATIC (exp))
1462 ret = unshare_expr (ret);
1466 /* Print a warning if a constant expression had overflow in folding.
1467 Invoke this function on every expression that the language
1468 requires to be a constant expression.
1469 Note the ANSI C standard says it is erroneous for a
1470 constant expression to overflow. */
1473 constant_expression_warning (tree value)
1475 if (warn_overflow && pedantic
1476 && (TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST
1477 || TREE_CODE (value) == FIXED_CST
1478 || TREE_CODE (value) == VECTOR_CST
1479 || TREE_CODE (value) == COMPLEX_CST)
1480 && TREE_OVERFLOW (value))
1481 pedwarn (input_location, OPT_Woverflow, "overflow in constant expression");
1484 /* The same as above but print an unconditional error. */
1486 constant_expression_error (tree value)
1488 if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST
1489 || TREE_CODE (value) == FIXED_CST
1490 || TREE_CODE (value) == VECTOR_CST
1491 || TREE_CODE (value) == COMPLEX_CST)
1492 && TREE_OVERFLOW (value))
1493 error ("overflow in constant expression");
1496 /* Print a warning if an expression had overflow in folding and its
1499 Invoke this function on every expression that
1500 (1) appears in the source code, and
1501 (2) is a constant expression that overflowed, and
1502 (3) is not already checked by convert_and_check;
1503 however, do not invoke this function on operands of explicit casts
1504 or when the expression is the result of an operator and any operand
1505 already overflowed. */
1508 overflow_warning (location_t loc, tree value)
1510 if (c_inhibit_evaluation_warnings != 0)
1513 switch (TREE_CODE (value))
1516 warning_at (loc, OPT_Woverflow, "integer overflow in expression");
1520 warning_at (loc, OPT_Woverflow,
1521 "floating point overflow in expression");
1525 warning_at (loc, OPT_Woverflow, "fixed-point overflow in expression");
1529 warning_at (loc, OPT_Woverflow, "vector overflow in expression");
1533 if (TREE_CODE (TREE_REALPART (value)) == INTEGER_CST)
1534 warning_at (loc, OPT_Woverflow,
1535 "complex integer overflow in expression");
1536 else if (TREE_CODE (TREE_REALPART (value)) == REAL_CST)
1537 warning_at (loc, OPT_Woverflow,
1538 "complex floating point overflow in expression");
1546 /* Warn about uses of logical || / && operator in a context where it
1547 is likely that the bitwise equivalent was intended by the
1548 programmer. We have seen an expression in which CODE is a binary
1549 operator used to combine expressions OP_LEFT and OP_RIGHT, which before folding
1550 had CODE_LEFT and CODE_RIGHT, into an expression of type TYPE. */
1552 warn_logical_operator (location_t location, enum tree_code code, tree type,
1553 enum tree_code code_left, tree op_left,
1554 enum tree_code ARG_UNUSED (code_right), tree op_right)
1556 int or_op = (code == TRUTH_ORIF_EXPR || code == TRUTH_OR_EXPR);
1557 int in0_p, in1_p, in_p;
1558 tree low0, low1, low, high0, high1, high, lhs, rhs, tem;
1559 bool strict_overflow_p = false;
1561 if (code != TRUTH_ANDIF_EXPR
1562 && code != TRUTH_AND_EXPR
1563 && code != TRUTH_ORIF_EXPR
1564 && code != TRUTH_OR_EXPR)
1567 /* Warn if &&/|| are being used in a context where it is
1568 likely that the bitwise equivalent was intended by the
1569 programmer. That is, an expression such as op && MASK
1570 where op should not be any boolean expression, nor a
1571 constant, and mask seems to be a non-boolean integer constant. */
1572 if (!truth_value_p (code_left)
1573 && INTEGRAL_TYPE_P (TREE_TYPE (op_left))
1574 && !CONSTANT_CLASS_P (op_left)
1575 && !TREE_NO_WARNING (op_left)
1576 && TREE_CODE (op_right) == INTEGER_CST
1577 && !integer_zerop (op_right)
1578 && !integer_onep (op_right))
1581 warning_at (location, OPT_Wlogical_op, "logical %<or%>"
1582 " applied to non-boolean constant");
1584 warning_at (location, OPT_Wlogical_op, "logical %<and%>"
1585 " applied to non-boolean constant");
1586 TREE_NO_WARNING (op_left) = true;
1590 /* We do not warn for constants because they are typical of macro
1591 expansions that test for features. */
1592 if (CONSTANT_CLASS_P (op_left) || CONSTANT_CLASS_P (op_right))
1595 /* This warning only makes sense with logical operands. */
1596 if (!(truth_value_p (TREE_CODE (op_left))
1597 || INTEGRAL_TYPE_P (TREE_TYPE (op_left)))
1598 || !(truth_value_p (TREE_CODE (op_right))
1599 || INTEGRAL_TYPE_P (TREE_TYPE (op_right))))
1602 lhs = make_range (op_left, &in0_p, &low0, &high0, &strict_overflow_p);
1603 rhs = make_range (op_right, &in1_p, &low1, &high1, &strict_overflow_p);
1605 if (lhs && TREE_CODE (lhs) == C_MAYBE_CONST_EXPR)
1606 lhs = C_MAYBE_CONST_EXPR_EXPR (lhs);
1608 if (rhs && TREE_CODE (rhs) == C_MAYBE_CONST_EXPR)
1609 rhs = C_MAYBE_CONST_EXPR_EXPR (rhs);
1611 /* If this is an OR operation, invert both sides; we will invert
1612 again at the end. */
1614 in0_p = !in0_p, in1_p = !in1_p;
1616 /* If both expressions are the same, if we can merge the ranges, and we
1617 can build the range test, return it or it inverted. */
1618 if (lhs && rhs && operand_equal_p (lhs, rhs, 0)
1619 && merge_ranges (&in_p, &low, &high, in0_p, low0, high0,
1621 && 0 != (tem = build_range_check (type, lhs, in_p, low, high)))
1623 if (TREE_CODE (tem) != INTEGER_CST)
1627 warning_at (location, OPT_Wlogical_op,
1629 "of collectively exhaustive tests is always true");
1631 warning_at (location, OPT_Wlogical_op,
1633 "of mutually exclusive tests is always false");
1638 /* Print a warning about casts that might indicate violation
1639 of strict aliasing rules if -Wstrict-aliasing is used and
1640 strict aliasing mode is in effect. OTYPE is the original
1641 TREE_TYPE of EXPR, and TYPE the type we're casting to. */
1644 strict_aliasing_warning (tree otype, tree type, tree expr)
1646 /* Strip pointer conversion chains and get to the correct original type. */
1648 otype = TREE_TYPE (expr);
1650 if (!(flag_strict_aliasing
1651 && POINTER_TYPE_P (type)
1652 && POINTER_TYPE_P (otype)
1653 && !VOID_TYPE_P (TREE_TYPE (type)))
1654 /* If the type we are casting to is a ref-all pointer
1655 dereferencing it is always valid. */
1656 || TYPE_REF_CAN_ALIAS_ALL (type))
1659 if ((warn_strict_aliasing > 1) && TREE_CODE (expr) == ADDR_EXPR
1660 && (DECL_P (TREE_OPERAND (expr, 0))
1661 || handled_component_p (TREE_OPERAND (expr, 0))))
1663 /* Casting the address of an object to non void pointer. Warn
1664 if the cast breaks type based aliasing. */
1665 if (!COMPLETE_TYPE_P (TREE_TYPE (type)) && warn_strict_aliasing == 2)
1667 warning (OPT_Wstrict_aliasing, "type-punning to incomplete type "
1668 "might break strict-aliasing rules");
1673 /* warn_strict_aliasing >= 3. This includes the default (3).
1674 Only warn if the cast is dereferenced immediately. */
1675 alias_set_type set1 =
1676 get_alias_set (TREE_TYPE (TREE_OPERAND (expr, 0)));
1677 alias_set_type set2 = get_alias_set (TREE_TYPE (type));
1679 if (set1 != set2 && set2 != 0
1680 && (set1 == 0 || !alias_sets_conflict_p (set1, set2)))
1682 warning (OPT_Wstrict_aliasing, "dereferencing type-punned "
1683 "pointer will break strict-aliasing rules");
1686 else if (warn_strict_aliasing == 2
1687 && !alias_sets_must_conflict_p (set1, set2))
1689 warning (OPT_Wstrict_aliasing, "dereferencing type-punned "
1690 "pointer might break strict-aliasing rules");
1696 if ((warn_strict_aliasing == 1) && !VOID_TYPE_P (TREE_TYPE (otype)))
1698 /* At this level, warn for any conversions, even if an address is
1699 not taken in the same statement. This will likely produce many
1700 false positives, but could be useful to pinpoint problems that
1701 are not revealed at higher levels. */
1702 alias_set_type set1 = get_alias_set (TREE_TYPE (otype));
1703 alias_set_type set2 = get_alias_set (TREE_TYPE (type));
1704 if (!COMPLETE_TYPE_P (type)
1705 || !alias_sets_must_conflict_p (set1, set2))
1707 warning (OPT_Wstrict_aliasing, "dereferencing type-punned "
1708 "pointer might break strict-aliasing rules");
1716 /* Warn for unlikely, improbable, or stupid DECL declarations
1720 check_main_parameter_types (tree decl)
1725 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl)); args;
1726 args = TREE_CHAIN (args))
1728 tree type = args ? TREE_VALUE (args) : 0;
1730 if (type == void_type_node || type == error_mark_node )
1737 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
1738 pedwarn (input_location, OPT_Wmain, "first argument of %q+D should be %<int%>",
1743 if (TREE_CODE (type) != POINTER_TYPE
1744 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
1745 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
1747 pedwarn (input_location, OPT_Wmain, "second argument of %q+D should be %<char **%>",
1752 if (TREE_CODE (type) != POINTER_TYPE
1753 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
1754 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
1756 pedwarn (input_location, OPT_Wmain, "third argument of %q+D should probably be "
1757 "%<char **%>", decl);
1762 /* It is intentional that this message does not mention the third
1763 argument because it's only mentioned in an appendix of the
1765 if (argct > 0 && (argct < 2 || argct > 3))
1766 pedwarn (input_location, OPT_Wmain, "%q+D takes only zero or two arguments", decl);
1769 /* True if pointers to distinct types T1 and T2 can be converted to
1770 each other without an explicit cast. Only returns true for opaque
1773 vector_targets_convertible_p (const_tree t1, const_tree t2)
1775 if (TREE_CODE (t1) == VECTOR_TYPE && TREE_CODE (t2) == VECTOR_TYPE
1776 && (TYPE_VECTOR_OPAQUE (t1) || TYPE_VECTOR_OPAQUE (t2))
1777 && tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2)))
1783 /* True if vector types T1 and T2 can be converted to each other
1784 without an explicit cast. If EMIT_LAX_NOTE is true, and T1 and T2
1785 can only be converted with -flax-vector-conversions yet that is not
1786 in effect, emit a note telling the user about that option if such
1787 a note has not previously been emitted. */
1789 vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note)
1791 static bool emitted_lax_note = false;
1792 bool convertible_lax;
1794 if ((TYPE_VECTOR_OPAQUE (t1) || TYPE_VECTOR_OPAQUE (t2))
1795 && tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2)))
1799 (tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2))
1800 && (TREE_CODE (TREE_TYPE (t1)) != REAL_TYPE ||
1801 TYPE_PRECISION (t1) == TYPE_PRECISION (t2))
1802 && (INTEGRAL_TYPE_P (TREE_TYPE (t1))
1803 == INTEGRAL_TYPE_P (TREE_TYPE (t2))));
1805 if (!convertible_lax || flag_lax_vector_conversions)
1806 return convertible_lax;
1808 if (TYPE_VECTOR_SUBPARTS (t1) == TYPE_VECTOR_SUBPARTS (t2)
1809 && lang_hooks.types_compatible_p (TREE_TYPE (t1), TREE_TYPE (t2)))
1812 if (emit_lax_note && !emitted_lax_note)
1814 emitted_lax_note = true;
1815 inform (input_location, "use -flax-vector-conversions to permit "
1816 "conversions between vectors with differing "
1817 "element types or numbers of subparts");
1823 /* This is a helper function of build_binary_op.
1825 For certain operations if both args were extended from the same
1826 smaller type, do the arithmetic in that type and then extend.
1828 BITWISE indicates a bitwise operation.
1829 For them, this optimization is safe only if
1830 both args are zero-extended or both are sign-extended.
1831 Otherwise, we might change the result.
1832 Eg, (short)-1 | (unsigned short)-1 is (int)-1
1833 but calculated in (unsigned short) it would be (unsigned short)-1.
1835 tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise)
1837 int unsigned0, unsigned1;
1842 /* Cast OP0 and OP1 to RESULT_TYPE. Doing so prevents
1843 excessive narrowing when we call get_narrower below. For
1844 example, suppose that OP0 is of unsigned int extended
1845 from signed char and that RESULT_TYPE is long long int.
1846 If we explicitly cast OP0 to RESULT_TYPE, OP0 would look
1849 (long long int) (unsigned int) signed_char
1851 which get_narrower would narrow down to
1853 (unsigned int) signed char
1855 If we do not cast OP0 first, get_narrower would return
1856 signed_char, which is inconsistent with the case of the
1858 op0 = convert (result_type, op0);
1859 op1 = convert (result_type, op1);
1861 arg0 = get_narrower (op0, &unsigned0);
1862 arg1 = get_narrower (op1, &unsigned1);
1864 /* UNS is 1 if the operation to be done is an unsigned one. */
1865 uns = TYPE_UNSIGNED (result_type);
1867 /* Handle the case that OP0 (or OP1) does not *contain* a conversion
1868 but it *requires* conversion to FINAL_TYPE. */
1870 if ((TYPE_PRECISION (TREE_TYPE (op0))
1871 == TYPE_PRECISION (TREE_TYPE (arg0)))
1872 && TREE_TYPE (op0) != result_type)
1873 unsigned0 = TYPE_UNSIGNED (TREE_TYPE (op0));
1874 if ((TYPE_PRECISION (TREE_TYPE (op1))
1875 == TYPE_PRECISION (TREE_TYPE (arg1)))
1876 && TREE_TYPE (op1) != result_type)
1877 unsigned1 = TYPE_UNSIGNED (TREE_TYPE (op1));
1879 /* Now UNSIGNED0 is 1 if ARG0 zero-extends to FINAL_TYPE. */
1881 /* For bitwise operations, signedness of nominal type
1882 does not matter. Consider only how operands were extended. */
1886 /* Note that in all three cases below we refrain from optimizing
1887 an unsigned operation on sign-extended args.
1888 That would not be valid. */
1890 /* Both args variable: if both extended in same way
1891 from same width, do it in that width.
1892 Do it unsigned if args were zero-extended. */
1893 if ((TYPE_PRECISION (TREE_TYPE (arg0))
1894 < TYPE_PRECISION (result_type))
1895 && (TYPE_PRECISION (TREE_TYPE (arg1))
1896 == TYPE_PRECISION (TREE_TYPE (arg0)))
1897 && unsigned0 == unsigned1
1898 && (unsigned0 || !uns))
1899 return c_common_signed_or_unsigned_type
1900 (unsigned0, common_type (TREE_TYPE (arg0), TREE_TYPE (arg1)));
1902 else if (TREE_CODE (arg0) == INTEGER_CST
1903 && (unsigned1 || !uns)
1904 && (TYPE_PRECISION (TREE_TYPE (arg1))
1905 < TYPE_PRECISION (result_type))
1907 = c_common_signed_or_unsigned_type (unsigned1,
1909 && !POINTER_TYPE_P (type)
1910 && int_fits_type_p (arg0, type))
1913 else if (TREE_CODE (arg1) == INTEGER_CST
1914 && (unsigned0 || !uns)
1915 && (TYPE_PRECISION (TREE_TYPE (arg0))
1916 < TYPE_PRECISION (result_type))
1918 = c_common_signed_or_unsigned_type (unsigned0,
1920 && !POINTER_TYPE_P (type)
1921 && int_fits_type_p (arg1, type))
1927 /* Warns if the conversion of EXPR to TYPE may alter a value.
1928 This is a helper function for warnings_for_convert_and_check. */
1931 conversion_warning (tree type, tree expr)
1933 bool give_warning = false;
1936 const int expr_num_operands = TREE_OPERAND_LENGTH (expr);
1937 tree expr_type = TREE_TYPE (expr);
1939 if (!warn_conversion && !warn_sign_conversion)
1942 /* If any operand is artificial, then this expression was generated
1943 by the compiler and we do not warn. */
1944 for (i = 0; i < expr_num_operands; i++)
1946 tree op = TREE_OPERAND (expr, i);
1947 if (op && DECL_P (op) && DECL_ARTIFICIAL (op))
1951 switch (TREE_CODE (expr))
1959 case TRUTH_ANDIF_EXPR:
1960 case TRUTH_ORIF_EXPR:
1961 case TRUTH_AND_EXPR:
1963 case TRUTH_XOR_EXPR:
1964 case TRUTH_NOT_EXPR:
1965 /* Conversion from boolean to a signed:1 bit-field (which only
1966 can hold the values 0 and -1) doesn't lose information - but
1967 it does change the value. */
1968 if (TYPE_PRECISION (type) == 1 && !TYPE_UNSIGNED (type))
1969 warning (OPT_Wconversion,
1970 "conversion to %qT from boolean expression", type);
1976 /* Warn for real constant that is not an exact integer converted
1978 if (TREE_CODE (expr_type) == REAL_TYPE
1979 && TREE_CODE (type) == INTEGER_TYPE)
1981 if (!real_isinteger (TREE_REAL_CST_PTR (expr), TYPE_MODE (expr_type)))
1982 give_warning = true;
1984 /* Warn for an integer constant that does not fit into integer type. */
1985 else if (TREE_CODE (expr_type) == INTEGER_TYPE
1986 && TREE_CODE (type) == INTEGER_TYPE
1987 && !int_fits_type_p (expr, type))
1989 if (TYPE_UNSIGNED (type) && !TYPE_UNSIGNED (expr_type)
1990 && tree_int_cst_sgn (expr) < 0)
1991 warning (OPT_Wsign_conversion,
1992 "negative integer implicitly converted to unsigned type");
1993 else if (!TYPE_UNSIGNED (type) && TYPE_UNSIGNED (expr_type))
1994 warning (OPT_Wsign_conversion, "conversion of unsigned constant "
1995 "value to negative integer");
1997 give_warning = true;
1999 else if (TREE_CODE (type) == REAL_TYPE)
2001 /* Warn for an integer constant that does not fit into real type. */
2002 if (TREE_CODE (expr_type) == INTEGER_TYPE)
2004 REAL_VALUE_TYPE a = real_value_from_int_cst (0, expr);
2005 if (!exact_real_truncate (TYPE_MODE (type), &a))
2006 give_warning = true;
2008 /* Warn for a real constant that does not fit into a smaller
2010 else if (TREE_CODE (expr_type) == REAL_TYPE
2011 && TYPE_PRECISION (type) < TYPE_PRECISION (expr_type))
2013 REAL_VALUE_TYPE a = TREE_REAL_CST (expr);
2014 if (!exact_real_truncate (TYPE_MODE (type), &a))
2015 give_warning = true;
2020 warning (OPT_Wconversion,
2021 "conversion to %qT alters %qT constant value",
2028 /* In case of COND_EXPR, if both operands are constants or
2029 COND_EXPR, then we do not care about the type of COND_EXPR,
2030 only about the conversion of each operand. */
2031 tree op1 = TREE_OPERAND (expr, 1);
2032 tree op2 = TREE_OPERAND (expr, 2);
2034 if ((TREE_CODE (op1) == REAL_CST || TREE_CODE (op1) == INTEGER_CST
2035 || TREE_CODE (op1) == COND_EXPR)
2036 && (TREE_CODE (op2) == REAL_CST || TREE_CODE (op2) == INTEGER_CST
2037 || TREE_CODE (op2) == COND_EXPR))
2039 conversion_warning (type, op1);
2040 conversion_warning (type, op2);
2046 default: /* 'expr' is not a constant. */
2048 /* Warn for real types converted to integer types. */
2049 if (TREE_CODE (expr_type) == REAL_TYPE
2050 && TREE_CODE (type) == INTEGER_TYPE)
2051 give_warning = true;
2053 else if (TREE_CODE (expr_type) == INTEGER_TYPE
2054 && TREE_CODE (type) == INTEGER_TYPE)
2056 /* Don't warn about unsigned char y = 0xff, x = (int) y; */
2057 expr = get_unwidened (expr, 0);
2058 expr_type = TREE_TYPE (expr);
2060 /* Don't warn for short y; short x = ((int)y & 0xff); */
2061 if (TREE_CODE (expr) == BIT_AND_EXPR
2062 || TREE_CODE (expr) == BIT_IOR_EXPR
2063 || TREE_CODE (expr) == BIT_XOR_EXPR)
2065 /* If both args were extended from a shortest type,
2066 use that type if that is safe. */
2067 expr_type = shorten_binary_op (expr_type,
2068 TREE_OPERAND (expr, 0),
2069 TREE_OPERAND (expr, 1),
2072 if (TREE_CODE (expr) == BIT_AND_EXPR)
2074 tree op0 = TREE_OPERAND (expr, 0);
2075 tree op1 = TREE_OPERAND (expr, 1);
2076 bool unsigned0 = TYPE_UNSIGNED (TREE_TYPE (op0));
2077 bool unsigned1 = TYPE_UNSIGNED (TREE_TYPE (op1));
2079 /* If one of the operands is a non-negative constant
2080 that fits in the target type, then the type of the
2081 other operand does not matter. */
2082 if ((TREE_CODE (op0) == INTEGER_CST
2083 && int_fits_type_p (op0, c_common_signed_type (type))
2084 && int_fits_type_p (op0, c_common_unsigned_type (type)))
2085 || (TREE_CODE (op1) == INTEGER_CST
2086 && int_fits_type_p (op1, c_common_signed_type (type))
2087 && int_fits_type_p (op1,
2088 c_common_unsigned_type (type))))
2090 /* If constant is unsigned and fits in the target
2091 type, then the result will also fit. */
2092 else if ((TREE_CODE (op0) == INTEGER_CST
2094 && int_fits_type_p (op0, type))
2095 || (TREE_CODE (op1) == INTEGER_CST
2097 && int_fits_type_p (op1, type)))
2101 /* Warn for integer types converted to smaller integer types. */
2102 if (TYPE_PRECISION (type) < TYPE_PRECISION (expr_type))
2103 give_warning = true;
2105 /* When they are the same width but different signedness,
2106 then the value may change. */
2107 else if ((TYPE_PRECISION (type) == TYPE_PRECISION (expr_type)
2108 && TYPE_UNSIGNED (expr_type) != TYPE_UNSIGNED (type))
2109 /* Even when converted to a bigger type, if the type is
2110 unsigned but expr is signed, then negative values
2112 || (TYPE_UNSIGNED (type) && !TYPE_UNSIGNED (expr_type)))
2113 warning (OPT_Wsign_conversion, "conversion to %qT from %qT "
2114 "may change the sign of the result",
2118 /* Warn for integer types converted to real types if and only if
2119 all the range of values of the integer type cannot be
2120 represented by the real type. */
2121 else if (TREE_CODE (expr_type) == INTEGER_TYPE
2122 && TREE_CODE (type) == REAL_TYPE)
2124 tree type_low_bound = TYPE_MIN_VALUE (expr_type);
2125 tree type_high_bound = TYPE_MAX_VALUE (expr_type);
2126 REAL_VALUE_TYPE real_low_bound
2127 = real_value_from_int_cst (0, type_low_bound);
2128 REAL_VALUE_TYPE real_high_bound
2129 = real_value_from_int_cst (0, type_high_bound);
2131 if (!exact_real_truncate (TYPE_MODE (type), &real_low_bound)
2132 || !exact_real_truncate (TYPE_MODE (type), &real_high_bound))
2133 give_warning = true;
2136 /* Warn for real types converted to smaller real types. */
2137 else if (TREE_CODE (expr_type) == REAL_TYPE
2138 && TREE_CODE (type) == REAL_TYPE
2139 && TYPE_PRECISION (type) < TYPE_PRECISION (expr_type))
2140 give_warning = true;
2144 warning (OPT_Wconversion,
2145 "conversion to %qT from %qT may alter its value",
2150 /* Produce warnings after a conversion. RESULT is the result of
2151 converting EXPR to TYPE. This is a helper function for
2152 convert_and_check and cp_convert_and_check. */
2155 warnings_for_convert_and_check (tree type, tree expr, tree result)
2157 if (TREE_CODE (expr) == INTEGER_CST
2158 && (TREE_CODE (type) == INTEGER_TYPE
2159 || TREE_CODE (type) == ENUMERAL_TYPE)
2160 && !int_fits_type_p (expr, type))
2162 /* Do not diagnose overflow in a constant expression merely
2163 because a conversion overflowed. */
2164 if (TREE_OVERFLOW (result))
2165 TREE_OVERFLOW (result) = TREE_OVERFLOW (expr);
2167 if (TYPE_UNSIGNED (type))
2169 /* This detects cases like converting -129 or 256 to
2171 if (!int_fits_type_p (expr, c_common_signed_type (type)))
2172 warning (OPT_Woverflow,
2173 "large integer implicitly truncated to unsigned type");
2175 conversion_warning (type, expr);
2177 else if (!int_fits_type_p (expr, c_common_unsigned_type (type)))
2178 warning (OPT_Woverflow,
2179 "overflow in implicit constant conversion");
2180 /* No warning for converting 0x80000000 to int. */
2182 && (TREE_CODE (TREE_TYPE (expr)) != INTEGER_TYPE
2183 || TYPE_PRECISION (TREE_TYPE (expr))
2184 != TYPE_PRECISION (type)))
2185 warning (OPT_Woverflow,
2186 "overflow in implicit constant conversion");
2189 conversion_warning (type, expr);
2191 else if ((TREE_CODE (result) == INTEGER_CST
2192 || TREE_CODE (result) == FIXED_CST) && TREE_OVERFLOW (result))
2193 warning (OPT_Woverflow,
2194 "overflow in implicit constant conversion");
2196 conversion_warning (type, expr);
2200 /* Convert EXPR to TYPE, warning about conversion problems with constants.
2201 Invoke this function on every expression that is converted implicitly,
2202 i.e. because of language rules and not because of an explicit cast. */
2205 convert_and_check (tree type, tree expr)
2208 tree expr_for_warning;
2210 /* Convert from a value with possible excess precision rather than
2211 via the semantic type, but do not warn about values not fitting
2212 exactly in the semantic type. */
2213 if (TREE_CODE (expr) == EXCESS_PRECISION_EXPR)
2215 tree orig_type = TREE_TYPE (expr);
2216 expr = TREE_OPERAND (expr, 0);
2217 expr_for_warning = convert (orig_type, expr);
2218 if (orig_type == type)
2219 return expr_for_warning;
2222 expr_for_warning = expr;
2224 if (TREE_TYPE (expr) == type)
2227 result = convert (type, expr);
2229 if (c_inhibit_evaluation_warnings == 0
2230 && !TREE_OVERFLOW_P (expr)
2231 && result != error_mark_node)
2232 warnings_for_convert_and_check (type, expr_for_warning, result);
2237 /* A node in a list that describes references to variables (EXPR), which are
2238 either read accesses if WRITER is zero, or write accesses, in which case
2239 WRITER is the parent of EXPR. */
2246 /* Used to implement a cache the results of a call to verify_tree. We only
2247 use this for SAVE_EXPRs. */
2250 struct tlist_cache *next;
2251 struct tlist *cache_before_sp;
2252 struct tlist *cache_after_sp;
2256 /* Obstack to use when allocating tlist structures, and corresponding
2258 static struct obstack tlist_obstack;
2259 static char *tlist_firstobj = 0;
2261 /* Keep track of the identifiers we've warned about, so we can avoid duplicate
2263 static struct tlist *warned_ids;
2264 /* SAVE_EXPRs need special treatment. We process them only once and then
2265 cache the results. */
2266 static struct tlist_cache *save_expr_cache;
2268 static void add_tlist (struct tlist **, struct tlist *, tree, int);
2269 static void merge_tlist (struct tlist **, struct tlist *, int);
2270 static void verify_tree (tree, struct tlist **, struct tlist **, tree);
2271 static int warning_candidate_p (tree);
2272 static bool candidate_equal_p (const_tree, const_tree);
2273 static void warn_for_collisions (struct tlist *);
2274 static void warn_for_collisions_1 (tree, tree, struct tlist *, int);
2275 static struct tlist *new_tlist (struct tlist *, tree, tree);
2277 /* Create a new struct tlist and fill in its fields. */
2278 static struct tlist *
2279 new_tlist (struct tlist *next, tree t, tree writer)
2282 l = XOBNEW (&tlist_obstack, struct tlist);
2289 /* Add duplicates of the nodes found in ADD to the list *TO. If EXCLUDE_WRITER
2290 is nonnull, we ignore any node we find which has a writer equal to it. */
2293 add_tlist (struct tlist **to, struct tlist *add, tree exclude_writer, int copy)
2297 struct tlist *next = add->next;
2300 if (!exclude_writer || !candidate_equal_p (add->writer, exclude_writer))
2301 *to = copy ? new_tlist (*to, add->expr, add->writer) : add;
2306 /* Merge the nodes of ADD into TO. This merging process is done so that for
2307 each variable that already exists in TO, no new node is added; however if
2308 there is a write access recorded in ADD, and an occurrence on TO is only
2309 a read access, then the occurrence in TO will be modified to record the
2313 merge_tlist (struct tlist **to, struct tlist *add, int copy)
2315 struct tlist **end = to;
2318 end = &(*end)->next;
2324 struct tlist *next = add->next;
2326 for (tmp2 = *to; tmp2; tmp2 = tmp2->next)
2327 if (candidate_equal_p (tmp2->expr, add->expr))
2331 tmp2->writer = add->writer;
2335 *end = copy ? add : new_tlist (NULL, add->expr, add->writer);
2336 end = &(*end)->next;
2343 /* WRITTEN is a variable, WRITER is its parent. Warn if any of the variable
2344 references in list LIST conflict with it, excluding reads if ONLY writers
2348 warn_for_collisions_1 (tree written, tree writer, struct tlist *list,
2353 /* Avoid duplicate warnings. */
2354 for (tmp = warned_ids; tmp; tmp = tmp->next)
2355 if (candidate_equal_p (tmp->expr, written))
2360 if (candidate_equal_p (list->expr, written)
2361 && !candidate_equal_p (list->writer, writer)
2362 && (!only_writes || list->writer))
2364 warned_ids = new_tlist (warned_ids, written, NULL_TREE);
2365 warning_at (EXPR_HAS_LOCATION (writer)
2366 ? EXPR_LOCATION (writer) : input_location,
2367 OPT_Wsequence_point, "operation on %qE may be undefined",
2374 /* Given a list LIST of references to variables, find whether any of these
2375 can cause conflicts due to missing sequence points. */
2378 warn_for_collisions (struct tlist *list)
2382 for (tmp = list; tmp; tmp = tmp->next)
2385 warn_for_collisions_1 (tmp->expr, tmp->writer, list, 0);
2389 /* Return nonzero if X is a tree that can be verified by the sequence point
2392 warning_candidate_p (tree x)
2394 /* !VOID_TYPE_P (TREE_TYPE (x)) is workaround for cp/tree.c
2395 (lvalue_p) crash on TRY/CATCH. */
2396 return !(DECL_P (x) && DECL_ARTIFICIAL (x))
2397 && TREE_TYPE (x) && !VOID_TYPE_P (TREE_TYPE (x)) && lvalue_p (x);
2400 /* Return nonzero if X and Y appear to be the same candidate (or NULL) */
2402 candidate_equal_p (const_tree x, const_tree y)
2404 return (x == y) || (x && y && operand_equal_p (x, y, 0));
2407 /* Walk the tree X, and record accesses to variables. If X is written by the
2408 parent tree, WRITER is the parent.
2409 We store accesses in one of the two lists: PBEFORE_SP, and PNO_SP. If this
2410 expression or its only operand forces a sequence point, then everything up
2411 to the sequence point is stored in PBEFORE_SP. Everything else gets stored
2413 Once we return, we will have emitted warnings if any subexpression before
2414 such a sequence point could be undefined. On a higher level, however, the
2415 sequence point may not be relevant, and we'll merge the two lists.
2417 Example: (b++, a) + b;
2418 The call that processes the COMPOUND_EXPR will store the increment of B
2419 in PBEFORE_SP, and the use of A in PNO_SP. The higher-level call that
2420 processes the PLUS_EXPR will need to merge the two lists so that
2421 eventually, all accesses end up on the same list (and we'll warn about the
2422 unordered subexpressions b++ and b.
2424 A note on merging. If we modify the former example so that our expression
2427 care must be taken not simply to add all three expressions into the final
2428 PNO_SP list. The function merge_tlist takes care of that by merging the
2429 before-SP list of the COMPOUND_EXPR into its after-SP list in a special
2430 way, so that no more than one access to B is recorded. */
2433 verify_tree (tree x, struct tlist **pbefore_sp, struct tlist **pno_sp,
2436 struct tlist *tmp_before, *tmp_nosp, *tmp_list2, *tmp_list3;
2437 enum tree_code code;
2438 enum tree_code_class cl;
2440 /* X may be NULL if it is the operand of an empty statement expression
2446 code = TREE_CODE (x);
2447 cl = TREE_CODE_CLASS (code);
2449 if (warning_candidate_p (x))
2450 *pno_sp = new_tlist (*pno_sp, x, writer);
2458 case TRUTH_ANDIF_EXPR:
2459 case TRUTH_ORIF_EXPR:
2460 tmp_before = tmp_nosp = tmp_list3 = 0;
2461 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE);
2462 warn_for_collisions (tmp_nosp);
2463 merge_tlist (pbefore_sp, tmp_before, 0);
2464 merge_tlist (pbefore_sp, tmp_nosp, 0);
2465 verify_tree (TREE_OPERAND (x, 1), &tmp_list3, pno_sp, NULL_TREE);
2466 merge_tlist (pbefore_sp, tmp_list3, 0);
2470 tmp_before = tmp_list2 = 0;
2471 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_list2, NULL_TREE);
2472 warn_for_collisions (tmp_list2);
2473 merge_tlist (pbefore_sp, tmp_before, 0);
2474 merge_tlist (pbefore_sp, tmp_list2, 1);
2476 tmp_list3 = tmp_nosp = 0;
2477 verify_tree (TREE_OPERAND (x, 1), &tmp_list3, &tmp_nosp, NULL_TREE);
2478 warn_for_collisions (tmp_nosp);
2479 merge_tlist (pbefore_sp, tmp_list3, 0);
2481 tmp_list3 = tmp_list2 = 0;
2482 verify_tree (TREE_OPERAND (x, 2), &tmp_list3, &tmp_list2, NULL_TREE);
2483 warn_for_collisions (tmp_list2);
2484 merge_tlist (pbefore_sp, tmp_list3, 0);
2485 /* Rather than add both tmp_nosp and tmp_list2, we have to merge the
2486 two first, to avoid warning for (a ? b++ : b++). */
2487 merge_tlist (&tmp_nosp, tmp_list2, 0);
2488 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
2491 case PREDECREMENT_EXPR:
2492 case PREINCREMENT_EXPR:
2493 case POSTDECREMENT_EXPR:
2494 case POSTINCREMENT_EXPR:
2495 verify_tree (TREE_OPERAND (x, 0), pno_sp, pno_sp, x);
2499 tmp_before = tmp_nosp = tmp_list3 = 0;
2500 verify_tree (TREE_OPERAND (x, 1), &tmp_before, &tmp_nosp, NULL_TREE);
2501 verify_tree (TREE_OPERAND (x, 0), &tmp_list3, &tmp_list3, x);
2502 /* Expressions inside the LHS are not ordered wrt. the sequence points
2503 in the RHS. Example:
2505 Despite the fact that the modification of "a" is in the before_sp
2506 list (tmp_before), it conflicts with the use of "a" in the LHS.
2507 We can handle this by adding the contents of tmp_list3
2508 to those of tmp_before, and redoing the collision warnings for that
2510 add_tlist (&tmp_before, tmp_list3, x, 1);
2511 warn_for_collisions (tmp_before);
2512 /* Exclude the LHS itself here; we first have to merge it into the
2513 tmp_nosp list. This is done to avoid warning for "a = a"; if we
2514 didn't exclude the LHS, we'd get it twice, once as a read and once
2516 add_tlist (pno_sp, tmp_list3, x, 0);
2517 warn_for_collisions_1 (TREE_OPERAND (x, 0), x, tmp_nosp, 1);
2519 merge_tlist (pbefore_sp, tmp_before, 0);
2520 if (warning_candidate_p (TREE_OPERAND (x, 0)))
2521 merge_tlist (&tmp_nosp, new_tlist (NULL, TREE_OPERAND (x, 0), x), 0);
2522 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 1);
2526 /* We need to warn about conflicts among arguments and conflicts between
2527 args and the function address. Side effects of the function address,
2528 however, are not ordered by the sequence point of the call. */
2530 call_expr_arg_iterator iter;
2532 tmp_before = tmp_nosp = 0;
2533 verify_tree (CALL_EXPR_FN (x), &tmp_before, &tmp_nosp, NULL_TREE);
2534 FOR_EACH_CALL_EXPR_ARG (arg, iter, x)
2536 tmp_list2 = tmp_list3 = 0;
2537 verify_tree (arg, &tmp_list2, &tmp_list3, NULL_TREE);
2538 merge_tlist (&tmp_list3, tmp_list2, 0);
2539 add_tlist (&tmp_before, tmp_list3, NULL_TREE, 0);
2541 add_tlist (&tmp_before, tmp_nosp, NULL_TREE, 0);
2542 warn_for_collisions (tmp_before);
2543 add_tlist (pbefore_sp, tmp_before, NULL_TREE, 0);
2548 /* Scan all the list, e.g. indices of multi dimensional array. */
2551 tmp_before = tmp_nosp = 0;
2552 verify_tree (TREE_VALUE (x), &tmp_before, &tmp_nosp, NULL_TREE);
2553 merge_tlist (&tmp_nosp, tmp_before, 0);
2554 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
2561 struct tlist_cache *t;
2562 for (t = save_expr_cache; t; t = t->next)
2563 if (candidate_equal_p (t->expr, x))
2568 t = XOBNEW (&tlist_obstack, struct tlist_cache);
2569 t->next = save_expr_cache;
2571 save_expr_cache = t;
2573 tmp_before = tmp_nosp = 0;
2574 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE);
2575 warn_for_collisions (tmp_nosp);
2580 struct tlist *t = tmp_nosp;
2582 merge_tlist (&tmp_list3, t, 0);
2584 t->cache_before_sp = tmp_before;
2585 t->cache_after_sp = tmp_list3;
2587 merge_tlist (pbefore_sp, t->cache_before_sp, 1);
2588 add_tlist (pno_sp, t->cache_after_sp, NULL_TREE, 1);
2593 x = TREE_OPERAND (x, 0);
2600 /* For other expressions, simply recurse on their operands.
2601 Manual tail recursion for unary expressions.
2602 Other non-expressions need not be processed. */
2603 if (cl == tcc_unary)
2605 x = TREE_OPERAND (x, 0);
2609 else if (IS_EXPR_CODE_CLASS (cl))
2612 int max = TREE_OPERAND_LENGTH (x);
2613 for (lp = 0; lp < max; lp++)
2615 tmp_before = tmp_nosp = 0;
2616 verify_tree (TREE_OPERAND (x, lp), &tmp_before, &tmp_nosp, 0);
2617 merge_tlist (&tmp_nosp, tmp_before, 0);
2618 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
2625 /* Try to warn for undefined behavior in EXPR due to missing sequence
2629 verify_sequence_points (tree expr)
2631 struct tlist *before_sp = 0, *after_sp = 0;
2634 save_expr_cache = 0;
2635 if (tlist_firstobj == 0)
2637 gcc_obstack_init (&tlist_obstack);
2638 tlist_firstobj = (char *) obstack_alloc (&tlist_obstack, 0);
2641 verify_tree (expr, &before_sp, &after_sp, 0);
2642 warn_for_collisions (after_sp);
2643 obstack_free (&tlist_obstack, tlist_firstobj);
2646 /* Validate the expression after `case' and apply default promotions. */
2649 check_case_value (tree value)
2651 if (value == NULL_TREE)
2654 /* ??? Can we ever get nops here for a valid case value? We
2656 STRIP_TYPE_NOPS (value);
2657 /* In C++, the following is allowed:
2660 switch (...) { case i: ... }
2662 So, we try to reduce the VALUE to a constant that way. */
2663 if (c_dialect_cxx ())
2665 value = decl_constant_value (value);
2666 STRIP_TYPE_NOPS (value);
2667 value = fold (value);
2670 if (TREE_CODE (value) == INTEGER_CST)
2671 /* Promote char or short to int. */
2672 value = perform_integral_promotions (value);
2673 else if (value != error_mark_node)
2675 error ("case label does not reduce to an integer constant");
2676 value = error_mark_node;
2679 constant_expression_warning (value);
2684 /* See if the case values LOW and HIGH are in the range of the original
2685 type (i.e. before the default conversion to int) of the switch testing
2687 TYPE is the promoted type of the testing expression, and ORIG_TYPE is
2688 the type before promoting it. CASE_LOW_P is a pointer to the lower
2689 bound of the case label, and CASE_HIGH_P is the upper bound or NULL
2690 if the case is not a case range.
2691 The caller has to make sure that we are not called with NULL for
2692 CASE_LOW_P (i.e. the default case).
2693 Returns true if the case label is in range of ORIG_TYPE (saturated or
2694 untouched) or false if the label is out of range. */
2697 check_case_bounds (tree type, tree orig_type,
2698 tree *case_low_p, tree *case_high_p)
2700 tree min_value, max_value;
2701 tree case_low = *case_low_p;
2702 tree case_high = case_high_p ? *case_high_p : case_low;
2704 /* If there was a problem with the original type, do nothing. */
2705 if (orig_type == error_mark_node)
2708 min_value = TYPE_MIN_VALUE (orig_type);
2709 max_value = TYPE_MAX_VALUE (orig_type);
2711 /* Case label is less than minimum for type. */
2712 if (tree_int_cst_compare (case_low, min_value) < 0
2713 && tree_int_cst_compare (case_high, min_value) < 0)
2715 warning (0, "case label value is less than minimum value for type");
2719 /* Case value is greater than maximum for type. */
2720 if (tree_int_cst_compare (case_low, max_value) > 0
2721 && tree_int_cst_compare (case_high, max_value) > 0)
2723 warning (0, "case label value exceeds maximum value for type");
2727 /* Saturate lower case label value to minimum. */
2728 if (tree_int_cst_compare (case_high, min_value) >= 0
2729 && tree_int_cst_compare (case_low, min_value) < 0)
2731 warning (0, "lower value in case label range"
2732 " less than minimum value for type");
2733 case_low = min_value;
2736 /* Saturate upper case label value to maximum. */
2737 if (tree_int_cst_compare (case_low, max_value) <= 0
2738 && tree_int_cst_compare (case_high, max_value) > 0)
2740 warning (0, "upper value in case label range"
2741 " exceeds maximum value for type");
2742 case_high = max_value;
2745 if (*case_low_p != case_low)
2746 *case_low_p = convert (type, case_low);
2747 if (case_high_p && *case_high_p != case_high)
2748 *case_high_p = convert (type, case_high);
2753 /* Return an integer type with BITS bits of precision,
2754 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
2757 c_common_type_for_size (unsigned int bits, int unsignedp)
2759 if (bits == TYPE_PRECISION (integer_type_node))
2760 return unsignedp ? unsigned_type_node : integer_type_node;
2762 if (bits == TYPE_PRECISION (signed_char_type_node))
2763 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
2765 if (bits == TYPE_PRECISION (short_integer_type_node))
2766 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
2768 if (bits == TYPE_PRECISION (long_integer_type_node))
2769 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
2771 if (bits == TYPE_PRECISION (long_long_integer_type_node))
2772 return (unsignedp ? long_long_unsigned_type_node
2773 : long_long_integer_type_node);
2775 if (bits == TYPE_PRECISION (widest_integer_literal_type_node))
2776 return (unsignedp ? widest_unsigned_literal_type_node
2777 : widest_integer_literal_type_node);
2779 if (bits <= TYPE_PRECISION (intQI_type_node))
2780 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
2782 if (bits <= TYPE_PRECISION (intHI_type_node))
2783 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
2785 if (bits <= TYPE_PRECISION (intSI_type_node))
2786 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
2788 if (bits <= TYPE_PRECISION (intDI_type_node))
2789 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
2794 /* Return a fixed-point type that has at least IBIT ibits and FBIT fbits
2795 that is unsigned if UNSIGNEDP is nonzero, otherwise signed;
2796 and saturating if SATP is nonzero, otherwise not saturating. */
2799 c_common_fixed_point_type_for_size (unsigned int ibit, unsigned int fbit,
2800 int unsignedp, int satp)
2802 enum machine_mode mode;
2804 mode = unsignedp ? UQQmode : QQmode;
2806 mode = unsignedp ? UHAmode : HAmode;
2808 for (; mode != VOIDmode; mode = GET_MODE_WIDER_MODE (mode))
2809 if (GET_MODE_IBIT (mode) >= ibit && GET_MODE_FBIT (mode) >= fbit)
2812 if (mode == VOIDmode || !targetm.scalar_mode_supported_p (mode))
2814 sorry ("GCC cannot support operators with integer types and "
2815 "fixed-point types that have too many integral and "
2816 "fractional bits together");
2820 return c_common_type_for_mode (mode, satp);
2823 /* Used for communication between c_common_type_for_mode and
2824 c_register_builtin_type. */
2825 static GTY(()) tree registered_builtin_types;
2827 /* Return a data type that has machine mode MODE.
2828 If the mode is an integer,
2829 then UNSIGNEDP selects between signed and unsigned types.
2830 If the mode is a fixed-point mode,
2831 then UNSIGNEDP selects between saturating and nonsaturating types. */
2834 c_common_type_for_mode (enum machine_mode mode, int unsignedp)
2838 if (mode == TYPE_MODE (integer_type_node))
2839 return unsignedp ? unsigned_type_node : integer_type_node;
2841 if (mode == TYPE_MODE (signed_char_type_node))
2842 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
2844 if (mode == TYPE_MODE (short_integer_type_node))
2845 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
2847 if (mode == TYPE_MODE (long_integer_type_node))
2848 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
2850 if (mode == TYPE_MODE (long_long_integer_type_node))
2851 return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node;
2853 if (mode == TYPE_MODE (widest_integer_literal_type_node))
2854 return unsignedp ? widest_unsigned_literal_type_node
2855 : widest_integer_literal_type_node;
2858 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
2861 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
2864 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
2867 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
2869 #if HOST_BITS_PER_WIDE_INT >= 64
2870 if (mode == TYPE_MODE (intTI_type_node))
2871 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
2874 if (mode == TYPE_MODE (float_type_node))
2875 return float_type_node;
2877 if (mode == TYPE_MODE (double_type_node))
2878 return double_type_node;
2880 if (mode == TYPE_MODE (long_double_type_node))
2881 return long_double_type_node;
2883 if (mode == TYPE_MODE (void_type_node))
2884 return void_type_node;
2886 if (mode == TYPE_MODE (build_pointer_type (char_type_node)))
2888 ? make_unsigned_type (GET_MODE_PRECISION (mode))
2889 : make_signed_type (GET_MODE_PRECISION (mode)));
2891 if (mode == TYPE_MODE (build_pointer_type (integer_type_node)))
2893 ? make_unsigned_type (GET_MODE_PRECISION (mode))
2894 : make_signed_type (GET_MODE_PRECISION (mode)));
2896 if (COMPLEX_MODE_P (mode))
2898 enum machine_mode inner_mode;
2901 if (mode == TYPE_MODE (complex_float_type_node))
2902 return complex_float_type_node;
2903 if (mode == TYPE_MODE (complex_double_type_node))
2904 return complex_double_type_node;
2905 if (mode == TYPE_MODE (complex_long_double_type_node))
2906 return complex_long_double_type_node;
2908 if (mode == TYPE_MODE (complex_integer_type_node) && !unsignedp)
2909 return complex_integer_type_node;
2911 inner_mode = GET_MODE_INNER (mode);
2912 inner_type = c_common_type_for_mode (inner_mode, unsignedp);
2913 if (inner_type != NULL_TREE)
2914 return build_complex_type (inner_type);
2916 else if (VECTOR_MODE_P (mode))
2918 enum machine_mode inner_mode = GET_MODE_INNER (mode);
2919 tree inner_type = c_common_type_for_mode (inner_mode, unsignedp);
2920 if (inner_type != NULL_TREE)
2921 return build_vector_type_for_mode (inner_type, mode);
2924 if (mode == TYPE_MODE (dfloat32_type_node))
2925 return dfloat32_type_node;
2926 if (mode == TYPE_MODE (dfloat64_type_node))
2927 return dfloat64_type_node;
2928 if (mode == TYPE_MODE (dfloat128_type_node))
2929 return dfloat128_type_node;
2931 if (ALL_SCALAR_FIXED_POINT_MODE_P (mode))
2933 if (mode == TYPE_MODE (short_fract_type_node))
2934 return unsignedp ? sat_short_fract_type_node : short_fract_type_node;
2935 if (mode == TYPE_MODE (fract_type_node))
2936 return unsignedp ? sat_fract_type_node : fract_type_node;
2937 if (mode == TYPE_MODE (long_fract_type_node))
2938 return unsignedp ? sat_long_fract_type_node : long_fract_type_node;
2939 if (mode == TYPE_MODE (long_long_fract_type_node))
2940 return unsignedp ? sat_long_long_fract_type_node
2941 : long_long_fract_type_node;
2943 if (mode == TYPE_MODE (unsigned_short_fract_type_node))
2944 return unsignedp ? sat_unsigned_short_fract_type_node
2945 : unsigned_short_fract_type_node;
2946 if (mode == TYPE_MODE (unsigned_fract_type_node))
2947 return unsignedp ? sat_unsigned_fract_type_node
2948 : unsigned_fract_type_node;
2949 if (mode == TYPE_MODE (unsigned_long_fract_type_node))
2950 return unsignedp ? sat_unsigned_long_fract_type_node
2951 : unsigned_long_fract_type_node;
2952 if (mode == TYPE_MODE (unsigned_long_long_fract_type_node))
2953 return unsignedp ? sat_unsigned_long_long_fract_type_node
2954 : unsigned_long_long_fract_type_node;
2956 if (mode == TYPE_MODE (short_accum_type_node))
2957 return unsignedp ? sat_short_accum_type_node : short_accum_type_node;
2958 if (mode == TYPE_MODE (accum_type_node))
2959 return unsignedp ? sat_accum_type_node : accum_type_node;
2960 if (mode == TYPE_MODE (long_accum_type_node))
2961 return unsignedp ? sat_long_accum_type_node : long_accum_type_node;
2962 if (mode == TYPE_MODE (long_long_accum_type_node))
2963 return unsignedp ? sat_long_long_accum_type_node
2964 : long_long_accum_type_node;
2966 if (mode == TYPE_MODE (unsigned_short_accum_type_node))
2967 return unsignedp ? sat_unsigned_short_accum_type_node
2968 : unsigned_short_accum_type_node;
2969 if (mode == TYPE_MODE (unsigned_accum_type_node))
2970 return unsignedp ? sat_unsigned_accum_type_node
2971 : unsigned_accum_type_node;
2972 if (mode == TYPE_MODE (unsigned_long_accum_type_node))
2973 return unsignedp ? sat_unsigned_long_accum_type_node
2974 : unsigned_long_accum_type_node;
2975 if (mode == TYPE_MODE (unsigned_long_long_accum_type_node))
2976 return unsignedp ? sat_unsigned_long_long_accum_type_node
2977 : unsigned_long_long_accum_type_node;
2980 return unsignedp ? sat_qq_type_node : qq_type_node;
2982 return unsignedp ? sat_hq_type_node : hq_type_node;
2984 return unsignedp ? sat_sq_type_node : sq_type_node;
2986 return unsignedp ? sat_dq_type_node : dq_type_node;
2988 return unsignedp ? sat_tq_type_node : tq_type_node;
2990 if (mode == UQQmode)
2991 return unsignedp ? sat_uqq_type_node : uqq_type_node;
2992 if (mode == UHQmode)
2993 return unsignedp ? sat_uhq_type_node : uhq_type_node;
2994 if (mode == USQmode)
2995 return unsignedp ? sat_usq_type_node : usq_type_node;
2996 if (mode == UDQmode)
2997 return unsignedp ? sat_udq_type_node : udq_type_node;
2998 if (mode == UTQmode)
2999 return unsignedp ? sat_utq_type_node : utq_type_node;
3002 return unsignedp ? sat_ha_type_node : ha_type_node;
3004 return unsignedp ? sat_sa_type_node : sa_type_node;
3006 return unsignedp ? sat_da_type_node : da_type_node;
3008 return unsignedp ? sat_ta_type_node : ta_type_node;
3010 if (mode == UHAmode)
3011 return unsignedp ? sat_uha_type_node : uha_type_node;
3012 if (mode == USAmode)
3013 return unsignedp ? sat_usa_type_node : usa_type_node;
3014 if (mode == UDAmode)
3015 return unsignedp ? sat_uda_type_node : uda_type_node;
3016 if (mode == UTAmode)
3017 return unsignedp ? sat_uta_type_node : uta_type_node;
3020 for (t = registered_builtin_types; t; t = TREE_CHAIN (t))
3021 if (TYPE_MODE (TREE_VALUE (t)) == mode)
3022 return TREE_VALUE (t);
3028 c_common_unsigned_type (tree type)
3030 return c_common_signed_or_unsigned_type (1, type);
3033 /* Return a signed type the same as TYPE in other respects. */
3036 c_common_signed_type (tree type)
3038 return c_common_signed_or_unsigned_type (0, type);
3041 /* Return a type the same as TYPE except unsigned or
3042 signed according to UNSIGNEDP. */
3045 c_common_signed_or_unsigned_type (int unsignedp, tree type)
3049 /* This block of code emulates the behavior of the old
3050 c_common_unsigned_type. In particular, it returns
3051 long_unsigned_type_node if passed a long, even when a int would
3052 have the same size. This is necessary for warnings to work
3053 correctly in archs where sizeof(int) == sizeof(long) */
3055 type1 = TYPE_MAIN_VARIANT (type);
3056 if (type1 == signed_char_type_node || type1 == char_type_node || type1 == unsigned_char_type_node)
3057 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3058 if (type1 == integer_type_node || type1 == unsigned_type_node)
3059 return unsignedp ? unsigned_type_node : integer_type_node;
3060 if (type1 == short_integer_type_node || type1 == short_unsigned_type_node)
3061 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3062 if (type1 == long_integer_type_node || type1 == long_unsigned_type_node)
3063 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3064 if (type1 == long_long_integer_type_node || type1 == long_long_unsigned_type_node)
3065 return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node;
3066 if (type1 == widest_integer_literal_type_node || type1 == widest_unsigned_literal_type_node)
3067 return unsignedp ? widest_unsigned_literal_type_node : widest_integer_literal_type_node;
3068 #if HOST_BITS_PER_WIDE_INT >= 64
3069 if (type1 == intTI_type_node || type1 == unsigned_intTI_type_node)
3070 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
3072 if (type1 == intDI_type_node || type1 == unsigned_intDI_type_node)
3073 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
3074 if (type1 == intSI_type_node || type1 == unsigned_intSI_type_node)
3075 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
3076 if (type1 == intHI_type_node || type1 == unsigned_intHI_type_node)
3077 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
3078 if (type1 == intQI_type_node || type1 == unsigned_intQI_type_node)
3079 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
3081 #define C_COMMON_FIXED_TYPES(NAME) \
3082 if (type1 == short_ ## NAME ## _type_node \
3083 || type1 == unsigned_short_ ## NAME ## _type_node) \
3084 return unsignedp ? unsigned_short_ ## NAME ## _type_node \
3085 : short_ ## NAME ## _type_node; \
3086 if (type1 == NAME ## _type_node \
3087 || type1 == unsigned_ ## NAME ## _type_node) \
3088 return unsignedp ? unsigned_ ## NAME ## _type_node \
3089 : NAME ## _type_node; \
3090 if (type1 == long_ ## NAME ## _type_node \
3091 || type1 == unsigned_long_ ## NAME ## _type_node) \
3092 return unsignedp ? unsigned_long_ ## NAME ## _type_node \
3093 : long_ ## NAME ## _type_node; \
3094 if (type1 == long_long_ ## NAME ## _type_node \
3095 || type1 == unsigned_long_long_ ## NAME ## _type_node) \
3096 return unsignedp ? unsigned_long_long_ ## NAME ## _type_node \
3097 : long_long_ ## NAME ## _type_node;
3099 #define C_COMMON_FIXED_MODE_TYPES(NAME) \
3100 if (type1 == NAME ## _type_node \
3101 || type1 == u ## NAME ## _type_node) \
3102 return unsignedp ? u ## NAME ## _type_node \
3103 : NAME ## _type_node;
3105 #define C_COMMON_FIXED_TYPES_SAT(NAME) \
3106 if (type1 == sat_ ## short_ ## NAME ## _type_node \
3107 || type1 == sat_ ## unsigned_short_ ## NAME ## _type_node) \
3108 return unsignedp ? sat_ ## unsigned_short_ ## NAME ## _type_node \
3109 : sat_ ## short_ ## NAME ## _type_node; \
3110 if (type1 == sat_ ## NAME ## _type_node \
3111 || type1 == sat_ ## unsigned_ ## NAME ## _type_node) \
3112 return unsignedp ? sat_ ## unsigned_ ## NAME ## _type_node \
3113 : sat_ ## NAME ## _type_node; \
3114 if (type1 == sat_ ## long_ ## NAME ## _type_node \
3115 || type1 == sat_ ## unsigned_long_ ## NAME ## _type_node) \
3116 return unsignedp ? sat_ ## unsigned_long_ ## NAME ## _type_node \
3117 : sat_ ## long_ ## NAME ## _type_node; \
3118 if (type1 == sat_ ## long_long_ ## NAME ## _type_node \
3119 || type1 == sat_ ## unsigned_long_long_ ## NAME ## _type_node) \
3120 return unsignedp ? sat_ ## unsigned_long_long_ ## NAME ## _type_node \
3121 : sat_ ## long_long_ ## NAME ## _type_node;
3123 #define C_COMMON_FIXED_MODE_TYPES_SAT(NAME) \
3124 if (type1 == sat_ ## NAME ## _type_node \
3125 || type1 == sat_ ## u ## NAME ## _type_node) \
3126 return unsignedp ? sat_ ## u ## NAME ## _type_node \
3127 : sat_ ## NAME ## _type_node;
3129 C_COMMON_FIXED_TYPES (fract);
3130 C_COMMON_FIXED_TYPES_SAT (fract);
3131 C_COMMON_FIXED_TYPES (accum);
3132 C_COMMON_FIXED_TYPES_SAT (accum);
3134 C_COMMON_FIXED_MODE_TYPES (qq);
3135 C_COMMON_FIXED_MODE_TYPES (hq);
3136 C_COMMON_FIXED_MODE_TYPES (sq);
3137 C_COMMON_FIXED_MODE_TYPES (dq);
3138 C_COMMON_FIXED_MODE_TYPES (tq);
3139 C_COMMON_FIXED_MODE_TYPES_SAT (qq);
3140 C_COMMON_FIXED_MODE_TYPES_SAT (hq);
3141 C_COMMON_FIXED_MODE_TYPES_SAT (sq);
3142 C_COMMON_FIXED_MODE_TYPES_SAT (dq);
3143 C_COMMON_FIXED_MODE_TYPES_SAT (tq);
3144 C_COMMON_FIXED_MODE_TYPES (ha);
3145 C_COMMON_FIXED_MODE_TYPES (sa);
3146 C_COMMON_FIXED_MODE_TYPES (da);
3147 C_COMMON_FIXED_MODE_TYPES (ta);
3148 C_COMMON_FIXED_MODE_TYPES_SAT (ha);
3149 C_COMMON_FIXED_MODE_TYPES_SAT (sa);
3150 C_COMMON_FIXED_MODE_TYPES_SAT (da);
3151 C_COMMON_FIXED_MODE_TYPES_SAT (ta);
3153 /* For ENUMERAL_TYPEs in C++, must check the mode of the types, not
3154 the precision; they have precision set to match their range, but
3155 may use a wider mode to match an ABI. If we change modes, we may
3156 wind up with bad conversions. For INTEGER_TYPEs in C, must check
3157 the precision as well, so as to yield correct results for
3158 bit-field types. C++ does not have these separate bit-field
3159 types, and producing a signed or unsigned variant of an
3160 ENUMERAL_TYPE may cause other problems as well. */
3162 if (!INTEGRAL_TYPE_P (type)
3163 || TYPE_UNSIGNED (type) == unsignedp)
3166 #define TYPE_OK(node) \
3167 (TYPE_MODE (type) == TYPE_MODE (node) \
3168 && TYPE_PRECISION (type) == TYPE_PRECISION (node))
3169 if (TYPE_OK (signed_char_type_node))
3170 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3171 if (TYPE_OK (integer_type_node))
3172 return unsignedp ? unsigned_type_node : integer_type_node;
3173 if (TYPE_OK (short_integer_type_node))
3174 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3175 if (TYPE_OK (long_integer_type_node))
3176 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3177 if (TYPE_OK (long_long_integer_type_node))
3178 return (unsignedp ? long_long_unsigned_type_node
3179 : long_long_integer_type_node);
3180 if (TYPE_OK (widest_integer_literal_type_node))
3181 return (unsignedp ? widest_unsigned_literal_type_node
3182 : widest_integer_literal_type_node);
3184 #if HOST_BITS_PER_WIDE_INT >= 64
3185 if (TYPE_OK (intTI_type_node))
3186 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
3188 if (TYPE_OK (intDI_type_node))
3189 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
3190 if (TYPE_OK (intSI_type_node))
3191 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
3192 if (TYPE_OK (intHI_type_node))
3193 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
3194 if (TYPE_OK (intQI_type_node))
3195 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
3198 return build_nonstandard_integer_type (TYPE_PRECISION (type), unsignedp);
3201 /* Build a bit-field integer type for the given WIDTH and UNSIGNEDP. */
3204 c_build_bitfield_integer_type (unsigned HOST_WIDE_INT width, int unsignedp)
3206 /* Extended integer types of the same width as a standard type have
3207 lesser rank, so those of the same width as int promote to int or
3208 unsigned int and are valid for printf formats expecting int or
3209 unsigned int. To avoid such special cases, avoid creating
3210 extended integer types for bit-fields if a standard integer type
3212 if (width == TYPE_PRECISION (integer_type_node))
3213 return unsignedp ? unsigned_type_node : integer_type_node;
3214 if (width == TYPE_PRECISION (signed_char_type_node))
3215 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3216 if (width == TYPE_PRECISION (short_integer_type_node))
3217 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3218 if (width == TYPE_PRECISION (long_integer_type_node))
3219 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3220 if (width == TYPE_PRECISION (long_long_integer_type_node))
3221 return (unsignedp ? long_long_unsigned_type_node
3222 : long_long_integer_type_node);
3223 return build_nonstandard_integer_type (width, unsignedp);
3226 /* The C version of the register_builtin_type langhook. */
3229 c_register_builtin_type (tree type, const char* name)
3233 decl = build_decl (UNKNOWN_LOCATION,
3234 TYPE_DECL, get_identifier (name), type);
3235 DECL_ARTIFICIAL (decl) = 1;
3236 if (!TYPE_NAME (type))
3237 TYPE_NAME (type) = decl;
3240 registered_builtin_types = tree_cons (0, type, registered_builtin_types);
3243 /* Print an error message for invalid operands to arith operation
3244 CODE with TYPE0 for operand 0, and TYPE1 for operand 1.
3245 LOCATION is the location of the message. */
3248 binary_op_error (location_t location, enum tree_code code,
3249 tree type0, tree type1)
3256 opname = "+"; break;
3258 opname = "-"; break;
3260 opname = "*"; break;
3262 opname = "max"; break;
3264 opname = "min"; break;
3266 opname = "=="; break;
3268 opname = "!="; break;
3270 opname = "<="; break;
3272 opname = ">="; break;
3274 opname = "<"; break;
3276 opname = ">"; break;
3278 opname = "<<"; break;
3280 opname = ">>"; break;
3281 case TRUNC_MOD_EXPR:
3282 case FLOOR_MOD_EXPR:
3283 opname = "%"; break;
3284 case TRUNC_DIV_EXPR:
3285 case FLOOR_DIV_EXPR:
3286 opname = "/"; break;
3288 opname = "&"; break;
3290 opname = "|"; break;
3291 case TRUTH_ANDIF_EXPR:
3292 opname = "&&"; break;
3293 case TRUTH_ORIF_EXPR:
3294 opname = "||"; break;
3296 opname = "^"; break;
3301 "invalid operands to binary %s (have %qT and %qT)", opname,
3305 /* Subroutine of build_binary_op, used for comparison operations.
3306 See if the operands have both been converted from subword integer types
3307 and, if so, perhaps change them both back to their original type.
3308 This function is also responsible for converting the two operands
3309 to the proper common type for comparison.
3311 The arguments of this function are all pointers to local variables
3312 of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1,
3313 RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE.
3315 If this function returns nonzero, it means that the comparison has
3316 a constant value. What this function returns is an expression for
3320 shorten_compare (tree *op0_ptr, tree *op1_ptr, tree *restype_ptr,
3321 enum tree_code *rescode_ptr)
3324 tree op0 = *op0_ptr;
3325 tree op1 = *op1_ptr;
3326 int unsignedp0, unsignedp1;
3328 tree primop0, primop1;
3329 enum tree_code code = *rescode_ptr;
3331 /* Throw away any conversions to wider types
3332 already present in the operands. */
3334 primop0 = get_narrower (op0, &unsignedp0);
3335 primop1 = get_narrower (op1, &unsignedp1);
3337 /* Handle the case that OP0 does not *contain* a conversion
3338 but it *requires* conversion to FINAL_TYPE. */
3340 if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr)
3341 unsignedp0 = TYPE_UNSIGNED (TREE_TYPE (op0));
3342 if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr)
3343 unsignedp1 = TYPE_UNSIGNED (TREE_TYPE (op1));
3345 /* If one of the operands must be floated, we cannot optimize. */
3346 real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE;
3347 real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE;
3349 /* If first arg is constant, swap the args (changing operation
3350 so value is preserved), for canonicalization. Don't do this if
3351 the second arg is 0. */
3353 if (TREE_CONSTANT (primop0)
3354 && !integer_zerop (primop1) && !real_zerop (primop1)
3355 && !fixed_zerop (primop1))
3358 int temi = unsignedp0;
3366 unsignedp0 = unsignedp1;
3389 *rescode_ptr = code;
3392 /* If comparing an integer against a constant more bits wide,
3393 maybe we can deduce a value of 1 or 0 independent of the data.
3394 Or else truncate the constant now
3395 rather than extend the variable at run time.
3397 This is only interesting if the constant is the wider arg.
3398 Also, it is not safe if the constant is unsigned and the
3399 variable arg is signed, since in this case the variable
3400 would be sign-extended and then regarded as unsigned.
3401 Our technique fails in this case because the lowest/highest
3402 possible unsigned results don't follow naturally from the
3403 lowest/highest possible values of the variable operand.
3404 For just EQ_EXPR and NE_EXPR there is another technique that
3405 could be used: see if the constant can be faithfully represented
3406 in the other operand's type, by truncating it and reextending it
3407 and see if that preserves the constant's value. */
3409 if (!real1 && !real2
3410 && TREE_CODE (TREE_TYPE (primop0)) != FIXED_POINT_TYPE
3411 && TREE_CODE (primop1) == INTEGER_CST
3412 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr))
3414 int min_gt, max_gt, min_lt, max_lt;
3415 tree maxval, minval;
3416 /* 1 if comparison is nominally unsigned. */
3417 int unsignedp = TYPE_UNSIGNED (*restype_ptr);
3420 type = c_common_signed_or_unsigned_type (unsignedp0,
3421 TREE_TYPE (primop0));
3423 maxval = TYPE_MAX_VALUE (type);
3424 minval = TYPE_MIN_VALUE (type);
3426 if (unsignedp && !unsignedp0)
3427 *restype_ptr = c_common_signed_type (*restype_ptr);
3429 if (TREE_TYPE (primop1) != *restype_ptr)
3431 /* Convert primop1 to target type, but do not introduce
3432 additional overflow. We know primop1 is an int_cst. */
3433 primop1 = force_fit_type_double (*restype_ptr,
3434 TREE_INT_CST_LOW (primop1),
3435 TREE_INT_CST_HIGH (primop1), 0,
3436 TREE_OVERFLOW (primop1));
3438 if (type != *restype_ptr)
3440 minval = convert (*restype_ptr, minval);
3441 maxval = convert (*restype_ptr, maxval);
3444 if (unsignedp && unsignedp0)
3446 min_gt = INT_CST_LT_UNSIGNED (primop1, minval);
3447 max_gt = INT_CST_LT_UNSIGNED (primop1, maxval);
3448 min_lt = INT_CST_LT_UNSIGNED (minval, primop1);
3449 max_lt = INT_CST_LT_UNSIGNED (maxval, primop1);
3453 min_gt = INT_CST_LT (primop1, minval);
3454 max_gt = INT_CST_LT (primop1, maxval);
3455 min_lt = INT_CST_LT (minval, primop1);
3456 max_lt = INT_CST_LT (maxval, primop1);
3460 /* This used to be a switch, but Genix compiler can't handle that. */
3461 if (code == NE_EXPR)
3463 if (max_lt || min_gt)
3464 val = truthvalue_true_node;
3466 else if (code == EQ_EXPR)
3468 if (max_lt || min_gt)
3469 val = truthvalue_false_node;
3471 else if (code == LT_EXPR)
3474 val = truthvalue_true_node;
3476 val = truthvalue_false_node;
3478 else if (code == GT_EXPR)
3481 val = truthvalue_true_node;
3483 val = truthvalue_false_node;
3485 else if (code == LE_EXPR)
3488 val = truthvalue_true_node;
3490 val = truthvalue_false_node;
3492 else if (code == GE_EXPR)
3495 val = truthvalue_true_node;
3497 val = truthvalue_false_node;
3500 /* If primop0 was sign-extended and unsigned comparison specd,
3501 we did a signed comparison above using the signed type bounds.
3502 But the comparison we output must be unsigned.
3504 Also, for inequalities, VAL is no good; but if the signed
3505 comparison had *any* fixed result, it follows that the
3506 unsigned comparison just tests the sign in reverse
3507 (positive values are LE, negative ones GE).
3508 So we can generate an unsigned comparison
3509 against an extreme value of the signed type. */
3511 if (unsignedp && !unsignedp0)
3518 primop1 = TYPE_MIN_VALUE (type);
3524 primop1 = TYPE_MAX_VALUE (type);
3531 type = c_common_unsigned_type (type);
3534 if (TREE_CODE (primop0) != INTEGER_CST)
3536 if (val == truthvalue_false_node)
3537 warning (OPT_Wtype_limits, "comparison is always false due to limited range of data type");
3538 if (val == truthvalue_true_node)
3539 warning (OPT_Wtype_limits, "comparison is always true due to limited range of data type");
3544 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
3545 if (TREE_SIDE_EFFECTS (primop0))
3546 return build2 (COMPOUND_EXPR, TREE_TYPE (val), primop0, val);
3550 /* Value is not predetermined, but do the comparison
3551 in the type of the operand that is not constant.
3552 TYPE is already properly set. */
3555 /* If either arg is decimal float and the other is float, find the
3556 proper common type to use for comparison. */
3557 else if (real1 && real2
3558 && (DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (primop0)))
3559 || DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (primop1)))))
3560 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1));
3562 else if (real1 && real2
3563 && (TYPE_PRECISION (TREE_TYPE (primop0))
3564 == TYPE_PRECISION (TREE_TYPE (primop1))))
3565 type = TREE_TYPE (primop0);
3567 /* If args' natural types are both narrower than nominal type
3568 and both extend in the same manner, compare them
3569 in the type of the wider arg.
3570 Otherwise must actually extend both to the nominal
3571 common type lest different ways of extending
3573 (eg, (short)-1 == (unsigned short)-1 should be 0.) */
3575 else if (unsignedp0 == unsignedp1 && real1 == real2
3576 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)
3577 && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr))
3579 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1));
3580 type = c_common_signed_or_unsigned_type (unsignedp0
3581 || TYPE_UNSIGNED (*restype_ptr),
3583 /* Make sure shorter operand is extended the right way
3584 to match the longer operand. */
3586 = convert (c_common_signed_or_unsigned_type (unsignedp0,
3587 TREE_TYPE (primop0)),
3590 = convert (c_common_signed_or_unsigned_type (unsignedp1,
3591 TREE_TYPE (primop1)),
3596 /* Here we must do the comparison on the nominal type
3597 using the args exactly as we received them. */
3598 type = *restype_ptr;
3602 if (!real1 && !real2 && integer_zerop (primop1)
3603 && TYPE_UNSIGNED (*restype_ptr))
3609 /* All unsigned values are >= 0, so we warn. However,
3610 if OP0 is a constant that is >= 0, the signedness of
3611 the comparison isn't an issue, so suppress the
3613 if (warn_type_limits && !in_system_header
3614 && !(TREE_CODE (primop0) == INTEGER_CST
3615 && !TREE_OVERFLOW (convert (c_common_signed_type (type),
3617 warning (OPT_Wtype_limits,
3618 "comparison of unsigned expression >= 0 is always true");
3619 value = truthvalue_true_node;
3623 if (warn_type_limits && !in_system_header
3624 && !(TREE_CODE (primop0) == INTEGER_CST
3625 && !TREE_OVERFLOW (convert (c_common_signed_type (type),
3627 warning (OPT_Wtype_limits,
3628 "comparison of unsigned expression < 0 is always false");
3629 value = truthvalue_false_node;
3638 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
3639 if (TREE_SIDE_EFFECTS (primop0))
3640 return build2 (COMPOUND_EXPR, TREE_TYPE (value),
3647 *op0_ptr = convert (type, primop0);
3648 *op1_ptr = convert (type, primop1);
3650 *restype_ptr = truthvalue_type_node;
3655 /* Return a tree for the sum or difference (RESULTCODE says which)
3656 of pointer PTROP and integer INTOP. */
3659 pointer_int_sum (enum tree_code resultcode, tree ptrop, tree intop)
3663 /* The result is a pointer of the same type that is being added. */
3664 tree result_type = TREE_TYPE (ptrop);
3666 if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE)
3668 pedwarn (input_location, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
3669 "pointer of type %<void *%> used in arithmetic");
3670 size_exp = integer_one_node;
3672 else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE)
3674 pedwarn (input_location, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
3675 "pointer to a function used in arithmetic");
3676 size_exp = integer_one_node;
3678 else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE)
3680 pedwarn (input_location, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
3681 "pointer to member function used in arithmetic");
3682 size_exp = integer_one_node;
3685 size_exp = size_in_bytes (TREE_TYPE (result_type));
3687 /* We are manipulating pointer values, so we don't need to warn
3688 about relying on undefined signed overflow. We disable the
3689 warning here because we use integer types so fold won't know that
3690 they are really pointers. */
3691 fold_defer_overflow_warnings ();
3693 /* If what we are about to multiply by the size of the elements
3694 contains a constant term, apply distributive law
3695 and multiply that constant term separately.
3696 This helps produce common subexpressions. */
3697 if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR)
3698 && !TREE_CONSTANT (intop)
3699 && TREE_CONSTANT (TREE_OPERAND (intop, 1))
3700 && TREE_CONSTANT (size_exp)
3701 /* If the constant comes from pointer subtraction,
3702 skip this optimization--it would cause an error. */
3703 && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE
3704 /* If the constant is unsigned, and smaller than the pointer size,
3705 then we must skip this optimization. This is because it could cause
3706 an overflow error if the constant is negative but INTOP is not. */
3707 && (!TYPE_UNSIGNED (TREE_TYPE (intop))
3708 || (TYPE_PRECISION (TREE_TYPE (intop))
3709 == TYPE_PRECISION (TREE_TYPE (ptrop)))))
3711 enum tree_code subcode = resultcode;
3712 tree int_type = TREE_TYPE (intop);
3713 if (TREE_CODE (intop) == MINUS_EXPR)
3714 subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR);
3715 /* Convert both subexpression types to the type of intop,
3716 because weird cases involving pointer arithmetic
3717 can result in a sum or difference with different type args. */
3718 ptrop = build_binary_op (EXPR_LOCATION (TREE_OPERAND (intop, 1)),
3720 convert (int_type, TREE_OPERAND (intop, 1)), 1);
3721 intop = convert (int_type, TREE_OPERAND (intop, 0));
3724 /* Convert the integer argument to a type the same size as sizetype
3725 so the multiply won't overflow spuriously. */
3726 if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype)
3727 || TYPE_UNSIGNED (TREE_TYPE (intop)) != TYPE_UNSIGNED (sizetype))
3728 intop = convert (c_common_type_for_size (TYPE_PRECISION (sizetype),
3729 TYPE_UNSIGNED (sizetype)), intop);
3731 /* Replace the integer argument with a suitable product by the object size.
3732 Do this multiplication as signed, then convert to the appropriate
3733 type for the pointer operation. */
3734 intop = convert (sizetype,
3735 build_binary_op (EXPR_LOCATION (intop),
3737 convert (TREE_TYPE (intop), size_exp), 1));
3739 /* Create the sum or difference. */
3740 if (resultcode == MINUS_EXPR)
3741 intop = fold_build1 (NEGATE_EXPR, sizetype, intop);
3743 ret = fold_build2 (POINTER_PLUS_EXPR, result_type, ptrop, intop);
3745 fold_undefer_and_ignore_overflow_warnings ();
3750 /* Wrap a SAVE_EXPR around EXPR, if appropriate. Like save_expr, but
3751 for C folds the inside expression and wraps a C_MAYBE_CONST_EXPR
3752 around the SAVE_EXPR if needed so that c_fully_fold does not need
3753 to look inside SAVE_EXPRs. */
3756 c_save_expr (tree expr)
3758 bool maybe_const = true;
3759 if (c_dialect_cxx ())
3760 return save_expr (expr);
3761 expr = c_fully_fold (expr, false, &maybe_const);
3762 expr = save_expr (expr);
3765 expr = build2 (C_MAYBE_CONST_EXPR, TREE_TYPE (expr), NULL, expr);
3766 C_MAYBE_CONST_EXPR_NON_CONST (expr) = 1;
3771 /* Return whether EXPR is a declaration whose address can never be
3775 decl_with_nonnull_addr_p (const_tree expr)
3777 return (DECL_P (expr)
3778 && (TREE_CODE (expr) == PARM_DECL
3779 || TREE_CODE (expr) == LABEL_DECL
3780 || !DECL_WEAK (expr)));
3783 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
3784 or for an `if' or `while' statement or ?..: exp. It should already
3785 have been validated to be of suitable type; otherwise, a bad
3786 diagnostic may result.
3788 The EXPR is located at LOCATION.
3790 This preparation consists of taking the ordinary
3791 representation of an expression expr and producing a valid tree
3792 boolean expression describing whether expr is nonzero. We could
3793 simply always do build_binary_op (NE_EXPR, expr, truthvalue_false_node, 1),
3794 but we optimize comparisons, &&, ||, and !.
3796 The resulting type should always be `truthvalue_type_node'. */
3799 c_common_truthvalue_conversion (location_t location, tree expr)
3801 switch (TREE_CODE (expr))
3803 case EQ_EXPR: case NE_EXPR: case UNEQ_EXPR: case LTGT_EXPR:
3804 case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR:
3805 case UNLE_EXPR: case UNGE_EXPR: case UNLT_EXPR: case UNGT_EXPR:
3806 case ORDERED_EXPR: case UNORDERED_EXPR:
3807 if (TREE_TYPE (expr) == truthvalue_type_node)
3809 expr = build2 (TREE_CODE (expr), truthvalue_type_node,
3810 TREE_OPERAND (expr, 0), TREE_OPERAND (expr, 1));
3813 case TRUTH_ANDIF_EXPR:
3814 case TRUTH_ORIF_EXPR:
3815 case TRUTH_AND_EXPR:
3817 case TRUTH_XOR_EXPR:
3818 if (TREE_TYPE (expr) == truthvalue_type_node)
3820 expr = build2 (TREE_CODE (expr), truthvalue_type_node,
3821 c_common_truthvalue_conversion (location,
3822 TREE_OPERAND (expr, 0)),
3823 c_common_truthvalue_conversion (location,
3824 TREE_OPERAND (expr, 1)));
3827 case TRUTH_NOT_EXPR:
3828 if (TREE_TYPE (expr) == truthvalue_type_node)
3830 expr = build1 (TREE_CODE (expr), truthvalue_type_node,
3831 c_common_truthvalue_conversion (location,
3832 TREE_OPERAND (expr, 0)));
3839 return integer_zerop (expr) ? truthvalue_false_node
3840 : truthvalue_true_node;
3843 return real_compare (NE_EXPR, &TREE_REAL_CST (expr), &dconst0)
3844 ? truthvalue_true_node
3845 : truthvalue_false_node;
3848 return fixed_compare (NE_EXPR, &TREE_FIXED_CST (expr),
3849 &FCONST0 (TYPE_MODE (TREE_TYPE (expr))))
3850 ? truthvalue_true_node
3851 : truthvalue_false_node;
3854 expr = build_unary_op (location, ADDR_EXPR, expr, 0);
3859 tree inner = TREE_OPERAND (expr, 0);
3860 if (decl_with_nonnull_addr_p (inner))
3862 /* Common Ada/Pascal programmer's mistake. */
3863 warning_at (location,
3865 "the address of %qD will always evaluate as %<true%>",
3867 return truthvalue_true_node;
3870 /* If we still have a decl, it is possible for its address to
3871 be NULL, so we cannot optimize. */
3874 gcc_assert (DECL_WEAK (inner));
3878 if (TREE_SIDE_EFFECTS (inner))
3880 expr = build2 (COMPOUND_EXPR, truthvalue_type_node,
3881 inner, truthvalue_true_node);
3885 return truthvalue_true_node;
3889 expr = build_binary_op (EXPR_LOCATION (expr),
3890 (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))
3891 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
3892 c_common_truthvalue_conversion (location,
3893 TREE_OPERAND (expr, 0)),
3894 c_common_truthvalue_conversion (location,
3895 TREE_OPERAND (expr, 1)),
3902 case EXCESS_PRECISION_EXPR:
3903 /* These don't change whether an object is nonzero or zero. */
3904 return c_common_truthvalue_conversion (location, TREE_OPERAND (expr, 0));
3908 /* These don't change whether an object is zero or nonzero, but
3909 we can't ignore them if their second arg has side-effects. */
3910 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)))
3912 expr = build2 (COMPOUND_EXPR, truthvalue_type_node,
3913 TREE_OPERAND (expr, 1),
3914 c_common_truthvalue_conversion
3915 (location, TREE_OPERAND (expr, 0)));
3919 return c_common_truthvalue_conversion (location,
3920 TREE_OPERAND (expr, 0));
3923 /* Distribute the conversion into the arms of a COND_EXPR. */
3924 if (c_dialect_cxx ())
3926 expr = fold_build3 (COND_EXPR, truthvalue_type_node,
3927 TREE_OPERAND (expr, 0),
3928 c_common_truthvalue_conversion (location,
3931 c_common_truthvalue_conversion (location,
3938 /* Folding will happen later for C. */
3939 expr = build3 (COND_EXPR, truthvalue_type_node,
3940 TREE_OPERAND (expr, 0),
3941 c_common_truthvalue_conversion (location,
3942 TREE_OPERAND (expr, 1)),
3943 c_common_truthvalue_conversion (location,
3944 TREE_OPERAND (expr, 2)));
3949 /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE,
3950 since that affects how `default_conversion' will behave. */
3951 if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE
3952 || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE)
3954 /* If this is widening the argument, we can ignore it. */
3955 if (TYPE_PRECISION (TREE_TYPE (expr))
3956 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0))))
3957 return c_common_truthvalue_conversion (location,
3958 TREE_OPERAND (expr, 0));
3962 if (!TREE_NO_WARNING (expr)
3963 && warn_parentheses)
3965 warning (OPT_Wparentheses,
3966 "suggest parentheses around assignment used as truth value");
3967 TREE_NO_WARNING (expr) = 1;
3975 if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE)
3977 tree t = c_save_expr (expr);
3978 expr = (build_binary_op
3979 (EXPR_LOCATION (expr),
3980 (TREE_SIDE_EFFECTS (expr)
3981 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
3982 c_common_truthvalue_conversion
3984 build_unary_op (location, REALPART_EXPR, t, 0)),
3985 c_common_truthvalue_conversion
3987 build_unary_op (location, IMAGPART_EXPR, t, 0)),
3992 if (TREE_CODE (TREE_TYPE (expr)) == FIXED_POINT_TYPE)
3994 tree fixed_zero_node = build_fixed (TREE_TYPE (expr),
3996 (TREE_TYPE (expr))));
3997 return build_binary_op (location, NE_EXPR, expr, fixed_zero_node, 1);
4000 return build_binary_op (location, NE_EXPR, expr, integer_zero_node, 1);
4003 protected_set_expr_location (expr, location);
4007 static void def_builtin_1 (enum built_in_function fncode,
4009 enum built_in_class fnclass,
4010 tree fntype, tree libtype,
4011 bool both_p, bool fallback_p, bool nonansi_p,
4012 tree fnattrs, bool implicit_p);
4015 /* Apply the TYPE_QUALS to the new DECL. */
4018 c_apply_type_quals_to_decl (int type_quals, tree decl)
4020 tree type = TREE_TYPE (decl);
4022 if (type == error_mark_node)
4025 if (((type_quals & TYPE_QUAL_CONST)
4026 || (type && TREE_CODE (type) == REFERENCE_TYPE))
4027 /* An object declared 'const' is only readonly after it is
4028 initialized. We don't have any way of expressing this currently,
4029 so we need to be conservative and unset TREE_READONLY for types
4030 with constructors. Otherwise aliasing code will ignore stores in
4031 an inline constructor. */
4032 && !(type && TYPE_NEEDS_CONSTRUCTING (type)))
4033 TREE_READONLY (decl) = 1;
4034 if (type_quals & TYPE_QUAL_VOLATILE)
4036 TREE_SIDE_EFFECTS (decl) = 1;
4037 TREE_THIS_VOLATILE (decl) = 1;
4039 if (type_quals & TYPE_QUAL_RESTRICT)
4041 while (type && TREE_CODE (type) == ARRAY_TYPE)
4042 /* Allow 'restrict' on arrays of pointers.
4043 FIXME currently we just ignore it. */
4044 type = TREE_TYPE (type);
4046 || !POINTER_TYPE_P (type)
4047 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type)))
4048 error ("invalid use of %<restrict%>");
4052 /* Hash function for the problem of multiple type definitions in
4053 different files. This must hash all types that will compare
4054 equal via comptypes to the same value. In practice it hashes
4055 on some of the simple stuff and leaves the details to comptypes. */
4058 c_type_hash (const void *p)
4062 const_tree const t = (const_tree) p;
4064 switch (TREE_CODE (t))
4066 /* For pointers, hash on pointee type plus some swizzling. */
4068 return c_type_hash (TREE_TYPE (t)) ^ 0x3003003;
4069 /* Hash on number of elements and total size. */
4072 t2 = TYPE_VALUES (t);
4076 t2 = TYPE_FIELDS (t);
4078 case QUAL_UNION_TYPE:
4080 t2 = TYPE_FIELDS (t);
4084 t2 = TYPE_FIELDS (t);
4089 for (; t2; t2 = TREE_CHAIN (t2))
4091 /* We might have a VLA here. */
4092 if (TREE_CODE (TYPE_SIZE (t)) != INTEGER_CST)
4095 size = TREE_INT_CST_LOW (TYPE_SIZE (t));
4096 return ((size << 24) | (i << shift));
4099 static GTY((param_is (union tree_node))) htab_t type_hash_table;
4101 /* Return the typed-based alias set for T, which may be an expression
4102 or a type. Return -1 if we don't do anything special. */
4105 c_common_get_alias_set (tree t)
4110 /* Permit type-punning when accessing a union, provided the access
4111 is directly through the union. For example, this code does not
4112 permit taking the address of a union member and then storing
4113 through it. Even the type-punning allowed here is a GCC
4114 extension, albeit a common and useful one; the C standard says
4115 that such accesses have implementation-defined behavior. */
4117 TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF;
4118 u = TREE_OPERAND (u, 0))
4119 if (TREE_CODE (u) == COMPONENT_REF
4120 && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE)
4123 /* That's all the expressions we handle specially. */
4127 /* The C standard guarantees that any object may be accessed via an
4128 lvalue that has character type. */
4129 if (t == char_type_node
4130 || t == signed_char_type_node
4131 || t == unsigned_char_type_node)
4134 /* The C standard specifically allows aliasing between signed and
4135 unsigned variants of the same type. We treat the signed
4136 variant as canonical. */
4137 if (TREE_CODE (t) == INTEGER_TYPE && TYPE_UNSIGNED (t))
4139 tree t1 = c_common_signed_type (t);
4141 /* t1 == t can happen for boolean nodes which are always unsigned. */
4143 return get_alias_set (t1);
4145 else if (POINTER_TYPE_P (t))
4149 /* Unfortunately, there is no canonical form of a pointer type.
4150 In particular, if we have `typedef int I', then `int *', and
4151 `I *' are different types. So, we have to pick a canonical
4152 representative. We do this below.
4154 Technically, this approach is actually more conservative that
4155 it needs to be. In particular, `const int *' and `int *'
4156 should be in different alias sets, according to the C and C++
4157 standard, since their types are not the same, and so,
4158 technically, an `int **' and `const int **' cannot point at
4161 But, the standard is wrong. In particular, this code is
4166 const int* const* cipp = ipp;
4168 And, it doesn't make sense for that to be legal unless you
4169 can dereference IPP and CIPP. So, we ignore cv-qualifiers on
4170 the pointed-to types. This issue has been reported to the
4172 t1 = build_type_no_quals (t);
4174 return get_alias_set (t1);
4177 /* Handle the case of multiple type nodes referring to "the same" type,
4178 which occurs with IMA. These share an alias set. FIXME: Currently only
4179 C90 is handled. (In C99 type compatibility is not transitive, which
4180 complicates things mightily. The alias set splay trees can theoretically
4181 represent this, but insertion is tricky when you consider all the
4182 different orders things might arrive in.) */
4184 if (c_language != clk_c || flag_isoc99)
4187 /* Save time if there's only one input file. */
4188 if (num_in_fnames == 1)
4191 /* Pointers need special handling if they point to any type that
4192 needs special handling (below). */
4193 if (TREE_CODE (t) == POINTER_TYPE)
4196 /* Find bottom type under any nested POINTERs. */
4197 for (t2 = TREE_TYPE (t);
4198 TREE_CODE (t2) == POINTER_TYPE;
4199 t2 = TREE_TYPE (t2))
4201 if (TREE_CODE (t2) != RECORD_TYPE
4202 && TREE_CODE (t2) != ENUMERAL_TYPE
4203 && TREE_CODE (t2) != QUAL_UNION_TYPE
4204 && TREE_CODE (t2) != UNION_TYPE)
4206 if (TYPE_SIZE (t2) == 0)
4209 /* These are the only cases that need special handling. */
4210 if (TREE_CODE (t) != RECORD_TYPE
4211 && TREE_CODE (t) != ENUMERAL_TYPE
4212 && TREE_CODE (t) != QUAL_UNION_TYPE
4213 && TREE_CODE (t) != UNION_TYPE
4214 && TREE_CODE (t) != POINTER_TYPE)
4217 if (TYPE_SIZE (t) == 0)
4220 /* Look up t in hash table. Only one of the compatible types within each
4221 alias set is recorded in the table. */
4222 if (!type_hash_table)
4223 type_hash_table = htab_create_ggc (1021, c_type_hash,
4224 (htab_eq) lang_hooks.types_compatible_p,
4226 slot = htab_find_slot (type_hash_table, t, INSERT);
4229 TYPE_ALIAS_SET (t) = TYPE_ALIAS_SET ((tree)*slot);
4230 return TYPE_ALIAS_SET ((tree)*slot);
4233 /* Our caller will assign and record (in t) a new alias set; all we need
4234 to do is remember t in the hash table. */
4240 /* Compute the value of 'sizeof (TYPE)' or '__alignof__ (TYPE)', where
4241 the second parameter indicates which OPERATOR is being applied.
4242 The COMPLAIN flag controls whether we should diagnose possibly
4243 ill-formed constructs or not. LOC is the location of the SIZEOF or
4247 c_sizeof_or_alignof_type (location_t loc,
4248 tree type, bool is_sizeof, int complain)
4250 const char *op_name;
4252 enum tree_code type_code = TREE_CODE (type);
4254 op_name = is_sizeof ? "sizeof" : "__alignof__";
4256 if (type_code == FUNCTION_TYPE)
4260 if (complain && (pedantic || warn_pointer_arith))
4261 pedwarn (loc, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
4262 "invalid application of %<sizeof%> to a function type");
4264 return error_mark_node;
4265 value = size_one_node;
4268 value = size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT);
4270 else if (type_code == VOID_TYPE || type_code == ERROR_MARK)
4272 if (type_code == VOID_TYPE
4273 && complain && (pedantic || warn_pointer_arith))
4274 pedwarn (loc, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
4275 "invalid application of %qs to a void type", op_name);
4277 return error_mark_node;
4278 value = size_one_node;
4280 else if (!COMPLETE_TYPE_P (type))
4283 error_at (loc, "invalid application of %qs to incomplete type %qT ",
4285 value = size_zero_node;
4290 /* Convert in case a char is more than one unit. */
4291 value = size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type),
4292 size_int (TYPE_PRECISION (char_type_node)
4295 value = size_int (TYPE_ALIGN_UNIT (type));
4298 /* VALUE will have an integer type with TYPE_IS_SIZETYPE set.
4299 TYPE_IS_SIZETYPE means that certain things (like overflow) will
4300 never happen. However, this node should really have type
4301 `size_t', which is just a typedef for an ordinary integer type. */
4302 value = fold_convert (size_type_node, value);
4303 gcc_assert (!TYPE_IS_SIZETYPE (TREE_TYPE (value)));
4308 /* Implement the __alignof keyword: Return the minimum required
4309 alignment of EXPR, measured in bytes. For VAR_DECLs,
4310 FUNCTION_DECLs and FIELD_DECLs return DECL_ALIGN (which can be set
4311 from an "aligned" __attribute__ specification). LOC is the
4312 location of the ALIGNOF operator. */
4315 c_alignof_expr (location_t loc, tree expr)
4319 if (VAR_OR_FUNCTION_DECL_P (expr))
4320 t = size_int (DECL_ALIGN_UNIT (expr));
4322 else if (TREE_CODE (expr) == COMPONENT_REF
4323 && DECL_C_BIT_FIELD (TREE_OPERAND (expr, 1)))
4325 error_at (loc, "%<__alignof%> applied to a bit-field");
4328 else if (TREE_CODE (expr) == COMPONENT_REF
4329 && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL)
4330 t = size_int (DECL_ALIGN_UNIT (TREE_OPERAND (expr, 1)));
4332 else if (TREE_CODE (expr) == INDIRECT_REF)
4334 tree t = TREE_OPERAND (expr, 0);
4336 int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
4338 while (CONVERT_EXPR_P (t)
4339 && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE)
4343 t = TREE_OPERAND (t, 0);
4344 thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
4345 if (thisalign > bestalign)
4346 best = t, bestalign = thisalign;
4348 return c_alignof (loc, TREE_TYPE (TREE_TYPE (best)));
4351 return c_alignof (loc, TREE_TYPE (expr));
4353 return fold_convert (size_type_node, t);
4356 /* Handle C and C++ default attributes. */
4358 enum built_in_attribute
4360 #define DEF_ATTR_NULL_TREE(ENUM) ENUM,
4361 #define DEF_ATTR_INT(ENUM, VALUE) ENUM,
4362 #define DEF_ATTR_IDENT(ENUM, STRING) ENUM,
4363 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM,
4364 #include "builtin-attrs.def"
4365 #undef DEF_ATTR_NULL_TREE
4367 #undef DEF_ATTR_IDENT
4368 #undef DEF_ATTR_TREE_LIST
4372 static GTY(()) tree built_in_attributes[(int) ATTR_LAST];
4374 static void c_init_attributes (void);
4378 #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME,
4379 #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME,
4380 #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME,
4381 #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME,
4382 #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
4383 #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
4384 #define DEF_FUNCTION_TYPE_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) NAME,
4385 #define DEF_FUNCTION_TYPE_6(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6) NAME,
4386 #define DEF_FUNCTION_TYPE_7(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7) NAME,
4387 #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME,
4388 #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME,
4389 #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME,
4390 #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
4391 #define DEF_FUNCTION_TYPE_VAR_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
4392 #define DEF_FUNCTION_TYPE_VAR_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG6) \
4394 #define DEF_POINTER_TYPE(NAME, TYPE) NAME,
4395 #include "builtin-types.def"
4396 #undef DEF_PRIMITIVE_TYPE
4397 #undef DEF_FUNCTION_TYPE_0
4398 #undef DEF_FUNCTION_TYPE_1
4399 #undef DEF_FUNCTION_TYPE_2
4400 #undef DEF_FUNCTION_TYPE_3
4401 #undef DEF_FUNCTION_TYPE_4
4402 #undef DEF_FUNCTION_TYPE_5
4403 #undef DEF_FUNCTION_TYPE_6
4404 #undef DEF_FUNCTION_TYPE_7
4405 #undef DEF_FUNCTION_TYPE_VAR_0
4406 #undef DEF_FUNCTION_TYPE_VAR_1
4407 #undef DEF_FUNCTION_TYPE_VAR_2
4408 #undef DEF_FUNCTION_TYPE_VAR_3
4409 #undef DEF_FUNCTION_TYPE_VAR_4
4410 #undef DEF_FUNCTION_TYPE_VAR_5
4411 #undef DEF_POINTER_TYPE
4415 typedef enum c_builtin_type builtin_type;
4417 /* A temporary array for c_common_nodes_and_builtins. Used in
4418 communication with def_fn_type. */
4419 static tree builtin_types[(int) BT_LAST + 1];
4421 /* A helper function for c_common_nodes_and_builtins. Build function type
4422 for DEF with return type RET and N arguments. If VAR is true, then the
4423 function should be variadic after those N arguments.
4425 Takes special care not to ICE if any of the types involved are
4426 error_mark_node, which indicates that said type is not in fact available
4427 (see builtin_type_for_size). In which case the function type as a whole
4428 should be error_mark_node. */
4431 def_fn_type (builtin_type def, builtin_type ret, bool var, int n, ...)
4433 tree args = NULL, t;
4438 for (i = 0; i < n; ++i)
4440 builtin_type a = (builtin_type) va_arg (list, int);
4441 t = builtin_types[a];
4442 if (t == error_mark_node)
4444 args = tree_cons (NULL_TREE, t, args);
4448 args = nreverse (args);
4450 args = chainon (args, void_list_node);
4452 t = builtin_types[ret];
4453 if (t == error_mark_node)
4455 t = build_function_type (t, args);
4458 builtin_types[def] = t;
4461 /* Build builtin functions common to both C and C++ language
4465 c_define_builtins (tree va_list_ref_type_node, tree va_list_arg_type_node)
4467 #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \
4468 builtin_types[ENUM] = VALUE;
4469 #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \
4470 def_fn_type (ENUM, RETURN, 0, 0);
4471 #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \
4472 def_fn_type (ENUM, RETURN, 0, 1, ARG1);
4473 #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \
4474 def_fn_type (ENUM, RETURN, 0, 2, ARG1, ARG2);
4475 #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
4476 def_fn_type (ENUM, RETURN, 0, 3, ARG1, ARG2, ARG3);
4477 #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \
4478 def_fn_type (ENUM, RETURN, 0, 4, ARG1, ARG2, ARG3, ARG4);
4479 #define DEF_FUNCTION_TYPE_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \
4480 def_fn_type (ENUM, RETURN, 0, 5, ARG1, ARG2, ARG3, ARG4, ARG5);
4481 #define DEF_FUNCTION_TYPE_6(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \
4483 def_fn_type (ENUM, RETURN, 0, 6, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6);
4484 #define DEF_FUNCTION_TYPE_7(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \
4486 def_fn_type (ENUM, RETURN, 0, 7, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7);
4487 #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \
4488 def_fn_type (ENUM, RETURN, 1, 0);
4489 #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \
4490 def_fn_type (ENUM, RETURN, 1, 1, ARG1);
4491 #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \
4492 def_fn_type (ENUM, RETURN, 1, 2, ARG1, ARG2);
4493 #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
4494 def_fn_type (ENUM, RETURN, 1, 3, ARG1, ARG2, ARG3);
4495 #define DEF_FUNCTION_TYPE_VAR_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \
4496 def_fn_type (ENUM, RETURN, 1, 4, ARG1, ARG2, ARG3, ARG4);
4497 #define DEF_FUNCTION_TYPE_VAR_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \
4498 def_fn_type (ENUM, RETURN, 1, 5, ARG1, ARG2, ARG3, ARG4, ARG5);
4499 #define DEF_POINTER_TYPE(ENUM, TYPE) \
4500 builtin_types[(int) ENUM] = build_pointer_type (builtin_types[(int) TYPE]);
4502 #include "builtin-types.def"
4504 #undef DEF_PRIMITIVE_TYPE
4505 #undef DEF_FUNCTION_TYPE_1
4506 #undef DEF_FUNCTION_TYPE_2
4507 #undef DEF_FUNCTION_TYPE_3
4508 #undef DEF_FUNCTION_TYPE_4
4509 #undef DEF_FUNCTION_TYPE_5
4510 #undef DEF_FUNCTION_TYPE_6
4511 #undef DEF_FUNCTION_TYPE_VAR_0
4512 #undef DEF_FUNCTION_TYPE_VAR_1
4513 #undef DEF_FUNCTION_TYPE_VAR_2
4514 #undef DEF_FUNCTION_TYPE_VAR_3
4515 #undef DEF_FUNCTION_TYPE_VAR_4
4516 #undef DEF_FUNCTION_TYPE_VAR_5
4517 #undef DEF_POINTER_TYPE
4518 builtin_types[(int) BT_LAST] = NULL_TREE;
4520 c_init_attributes ();
4522 #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, FALLBACK_P, \
4523 NONANSI_P, ATTRS, IMPLICIT, COND) \
4525 def_builtin_1 (ENUM, NAME, CLASS, \
4526 builtin_types[(int) TYPE], \
4527 builtin_types[(int) LIBTYPE], \
4528 BOTH_P, FALLBACK_P, NONANSI_P, \
4529 built_in_attributes[(int) ATTRS], IMPLICIT);
4530 #include "builtins.def"
4533 targetm.init_builtins ();
4535 build_common_builtin_nodes ();
4541 /* Like get_identifier, but avoid warnings about null arguments when
4542 the argument may be NULL for targets where GCC lacks stdint.h type
4546 c_get_ident (const char *id)
4548 return get_identifier (id);
4551 /* Build tree nodes and builtin functions common to both C and C++ language
4555 c_common_nodes_and_builtins (void)
4557 int char16_type_size;
4558 int char32_type_size;
4559 int wchar_type_size;
4560 tree array_domain_type;
4561 tree va_list_ref_type_node;
4562 tree va_list_arg_type_node;
4564 /* Define `int' and `char' first so that dbx will output them first. */
4565 record_builtin_type (RID_INT, NULL, integer_type_node);
4566 record_builtin_type (RID_CHAR, "char", char_type_node);
4568 /* `signed' is the same as `int'. FIXME: the declarations of "signed",
4569 "unsigned long", "long long unsigned" and "unsigned short" were in C++
4570 but not C. Are the conditionals here needed? */
4571 if (c_dialect_cxx ())
4572 record_builtin_type (RID_SIGNED, NULL, integer_type_node);
4573 record_builtin_type (RID_LONG, "long int", long_integer_type_node);
4574 record_builtin_type (RID_UNSIGNED, "unsigned int", unsigned_type_node);
4575 record_builtin_type (RID_MAX, "long unsigned int",
4576 long_unsigned_type_node);
4577 if (c_dialect_cxx ())
4578 record_builtin_type (RID_MAX, "unsigned long", long_unsigned_type_node);
4579 record_builtin_type (RID_MAX, "long long int",
4580 long_long_integer_type_node);
4581 record_builtin_type (RID_MAX, "long long unsigned int",
4582 long_long_unsigned_type_node);
4583 if (c_dialect_cxx ())
4584 record_builtin_type (RID_MAX, "long long unsigned",
4585 long_long_unsigned_type_node);
4586 record_builtin_type (RID_SHORT, "short int", short_integer_type_node);
4587 record_builtin_type (RID_MAX, "short unsigned int",
4588 short_unsigned_type_node);
4589 if (c_dialect_cxx ())
4590 record_builtin_type (RID_MAX, "unsigned short",
4591 short_unsigned_type_node);
4593 /* Define both `signed char' and `unsigned char'. */
4594 record_builtin_type (RID_MAX, "signed char", signed_char_type_node);
4595 record_builtin_type (RID_MAX, "unsigned char", unsigned_char_type_node);
4597 /* These are types that c_common_type_for_size and
4598 c_common_type_for_mode use. */
4599 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4600 TYPE_DECL, NULL_TREE,
4602 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4603 TYPE_DECL, NULL_TREE,
4605 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4606 TYPE_DECL, NULL_TREE,
4608 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4609 TYPE_DECL, NULL_TREE,
4611 #if HOST_BITS_PER_WIDE_INT >= 64
4612 if (targetm.scalar_mode_supported_p (TImode))
4613 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4615 get_identifier ("__int128_t"),
4618 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4619 TYPE_DECL, NULL_TREE,
4620 unsigned_intQI_type_node));
4621 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4622 TYPE_DECL, NULL_TREE,
4623 unsigned_intHI_type_node));
4624 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4625 TYPE_DECL, NULL_TREE,
4626 unsigned_intSI_type_node));
4627 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4628 TYPE_DECL, NULL_TREE,
4629 unsigned_intDI_type_node));
4630 #if HOST_BITS_PER_WIDE_INT >= 64
4631 if (targetm.scalar_mode_supported_p (TImode))
4632 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4634 get_identifier ("__uint128_t"),
4635 unsigned_intTI_type_node));
4638 /* Create the widest literal types. */
4639 widest_integer_literal_type_node
4640 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
4641 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4642 TYPE_DECL, NULL_TREE,
4643 widest_integer_literal_type_node));
4645 widest_unsigned_literal_type_node
4646 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
4647 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4648 TYPE_DECL, NULL_TREE,
4649 widest_unsigned_literal_type_node));
4651 /* `unsigned long' is the standard type for sizeof.
4652 Note that stddef.h uses `unsigned long',
4653 and this must agree, even if long and int are the same size. */
4655 TREE_TYPE (identifier_global_value (get_identifier (SIZE_TYPE)));
4656 signed_size_type_node = c_common_signed_type (size_type_node);
4657 set_sizetype (size_type_node);
4660 TREE_TYPE (identifier_global_value (get_identifier (PID_TYPE)));
4662 build_common_tree_nodes_2 (flag_short_double);
4664 record_builtin_type (RID_FLOAT, NULL, float_type_node);
4665 record_builtin_type (RID_DOUBLE, NULL, double_type_node);
4666 record_builtin_type (RID_MAX, "long double", long_double_type_node);
4668 /* Only supported decimal floating point extension if the target
4669 actually supports underlying modes. */
4670 if (targetm.scalar_mode_supported_p (SDmode)
4671 && targetm.scalar_mode_supported_p (DDmode)
4672 && targetm.scalar_mode_supported_p (TDmode))
4674 record_builtin_type (RID_DFLOAT32, NULL, dfloat32_type_node);
4675 record_builtin_type (RID_DFLOAT64, NULL, dfloat64_type_node);
4676 record_builtin_type (RID_DFLOAT128, NULL, dfloat128_type_node);
4679 if (targetm.fixed_point_supported_p ())
4681 record_builtin_type (RID_MAX, "short _Fract", short_fract_type_node);
4682 record_builtin_type (RID_FRACT, NULL, fract_type_node);
4683 record_builtin_type (RID_MAX, "long _Fract", long_fract_type_node);
4684 record_builtin_type (RID_MAX, "long long _Fract",
4685 long_long_fract_type_node);
4686 record_builtin_type (RID_MAX, "unsigned short _Fract",
4687 unsigned_short_fract_type_node);
4688 record_builtin_type (RID_MAX, "unsigned _Fract",
4689 unsigned_fract_type_node);
4690 record_builtin_type (RID_MAX, "unsigned long _Fract",
4691 unsigned_long_fract_type_node);
4692 record_builtin_type (RID_MAX, "unsigned long long _Fract",
4693 unsigned_long_long_fract_type_node);
4694 record_builtin_type (RID_MAX, "_Sat short _Fract",
4695 sat_short_fract_type_node);
4696 record_builtin_type (RID_MAX, "_Sat _Fract", sat_fract_type_node);
4697 record_builtin_type (RID_MAX, "_Sat long _Fract",
4698 sat_long_fract_type_node);
4699 record_builtin_type (RID_MAX, "_Sat long long _Fract",
4700 sat_long_long_fract_type_node);
4701 record_builtin_type (RID_MAX, "_Sat unsigned short _Fract",
4702 sat_unsigned_short_fract_type_node);
4703 record_builtin_type (RID_MAX, "_Sat unsigned _Fract",
4704 sat_unsigned_fract_type_node);
4705 record_builtin_type (RID_MAX, "_Sat unsigned long _Fract",
4706 sat_unsigned_long_fract_type_node);
4707 record_builtin_type (RID_MAX, "_Sat unsigned long long _Fract",
4708 sat_unsigned_long_long_fract_type_node);
4709 record_builtin_type (RID_MAX, "short _Accum", short_accum_type_node);
4710 record_builtin_type (RID_ACCUM, NULL, accum_type_node);
4711 record_builtin_type (RID_MAX, "long _Accum", long_accum_type_node);
4712 record_builtin_type (RID_MAX, "long long _Accum",
4713 long_long_accum_type_node);
4714 record_builtin_type (RID_MAX, "unsigned short _Accum",
4715 unsigned_short_accum_type_node);
4716 record_builtin_type (RID_MAX, "unsigned _Accum",
4717 unsigned_accum_type_node);
4718 record_builtin_type (RID_MAX, "unsigned long _Accum",
4719 unsigned_long_accum_type_node);
4720 record_builtin_type (RID_MAX, "unsigned long long _Accum",
4721 unsigned_long_long_accum_type_node);
4722 record_builtin_type (RID_MAX, "_Sat short _Accum",
4723 sat_short_accum_type_node);
4724 record_builtin_type (RID_MAX, "_Sat _Accum", sat_accum_type_node);
4725 record_builtin_type (RID_MAX, "_Sat long _Accum",
4726 sat_long_accum_type_node);
4727 record_builtin_type (RID_MAX, "_Sat long long _Accum",
4728 sat_long_long_accum_type_node);
4729 record_builtin_type (RID_MAX, "_Sat unsigned short _Accum",
4730 sat_unsigned_short_accum_type_node);
4731 record_builtin_type (RID_MAX, "_Sat unsigned _Accum",
4732 sat_unsigned_accum_type_node);
4733 record_builtin_type (RID_MAX, "_Sat unsigned long _Accum",
4734 sat_unsigned_long_accum_type_node);
4735 record_builtin_type (RID_MAX, "_Sat unsigned long long _Accum",
4736 sat_unsigned_long_long_accum_type_node);
4740 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4742 get_identifier ("complex int"),
4743 complex_integer_type_node));
4744 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4746 get_identifier ("complex float"),
4747 complex_float_type_node));
4748 lang_hooks.decls.pushdecl (build_decl (UNKNOWN_LOCATION,
4750 get_identifier ("complex double"),
4751 complex_double_type_node));
4752 lang_hooks.decls.pushdecl
4753 (build_decl (UNKNOWN_LOCATION,
4754 TYPE_DECL, get_identifier ("complex long double"),
4755 complex_long_double_type_node));
4757 if (c_dialect_cxx ())
4758 /* For C++, make fileptr_type_node a distinct void * type until
4759 FILE type is defined. */
4760 fileptr_type_node = build_variant_type_copy (ptr_type_node);
4762 record_builtin_type (RID_VOID, NULL, void_type_node);
4764 /* Set the TYPE_NAME for any variants that were built before
4765 record_builtin_type gave names to the built-in types. */
4767 tree void_name = TYPE_NAME (void_type_node);
4768 TYPE_NAME (void_type_node) = NULL_TREE;
4769 TYPE_NAME (build_qualified_type (void_type_node, TYPE_QUAL_CONST))
4771 TYPE_NAME (void_type_node) = void_name;
4774 /* This node must not be shared. */
4775 void_zero_node = make_node (INTEGER_CST);
4776 TREE_TYPE (void_zero_node) = void_type_node;
4778 void_list_node = build_void_list_node ();
4780 /* Make a type to be the domain of a few array types
4781 whose domains don't really matter.
4782 200 is small enough that it always fits in size_t
4783 and large enough that it can hold most function names for the
4784 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
4785 array_domain_type = build_index_type (size_int (200));
4787 /* Make a type for arrays of characters.
4788 With luck nothing will ever really depend on the length of this
4790 char_array_type_node
4791 = build_array_type (char_type_node, array_domain_type);
4793 /* Likewise for arrays of ints. */
4795 = build_array_type (integer_type_node, array_domain_type);
4797 string_type_node = build_pointer_type (char_type_node);
4798 const_string_type_node
4799 = build_pointer_type (build_qualified_type
4800 (char_type_node, TYPE_QUAL_CONST));
4802 /* This is special for C++ so functions can be overloaded. */
4803 wchar_type_node = get_identifier (MODIFIED_WCHAR_TYPE);
4804 wchar_type_node = TREE_TYPE (identifier_global_value (wchar_type_node));
4805 wchar_type_size = TYPE_PRECISION (wchar_type_node);
4806 underlying_wchar_type_node = wchar_type_node;
4807 if (c_dialect_cxx ())
4809 if (TYPE_UNSIGNED (wchar_type_node))
4810 wchar_type_node = make_unsigned_type (wchar_type_size);
4812 wchar_type_node = make_signed_type (wchar_type_size);
4813 record_builtin_type (RID_WCHAR, "wchar_t", wchar_type_node);
4816 /* This is for wide string constants. */
4817 wchar_array_type_node
4818 = build_array_type (wchar_type_node, array_domain_type);
4820 /* Define 'char16_t'. */
4821 char16_type_node = get_identifier (CHAR16_TYPE);
4822 char16_type_node = TREE_TYPE (identifier_global_value (char16_type_node));
4823 char16_type_size = TYPE_PRECISION (char16_type_node);
4824 if (c_dialect_cxx ())
4826 char16_type_node = make_unsigned_type (char16_type_size);
4828 if (cxx_dialect == cxx0x)
4829 record_builtin_type (RID_CHAR16, "char16_t", char16_type_node);
4832 /* This is for UTF-16 string constants. */
4833 char16_array_type_node
4834 = build_array_type (char16_type_node, array_domain_type);
4836 /* Define 'char32_t'. */
4837 char32_type_node = get_identifier (CHAR32_TYPE);
4838 char32_type_node = TREE_TYPE (identifier_global_value (char32_type_node));
4839 char32_type_size = TYPE_PRECISION (char32_type_node);
4840 if (c_dialect_cxx ())
4842 char32_type_node = make_unsigned_type (char32_type_size);
4844 if (cxx_dialect == cxx0x)
4845 record_builtin_type (RID_CHAR32, "char32_t", char32_type_node);
4848 /* This is for UTF-32 string constants. */
4849 char32_array_type_node
4850 = build_array_type (char32_type_node, array_domain_type);
4853 TREE_TYPE (identifier_global_value (get_identifier (WINT_TYPE)));
4856 TREE_TYPE (identifier_global_value (get_identifier (INTMAX_TYPE)));
4858 TREE_TYPE (identifier_global_value (get_identifier (UINTMAX_TYPE)));
4860 if (SIG_ATOMIC_TYPE)
4861 sig_atomic_type_node =
4862 TREE_TYPE (identifier_global_value (c_get_ident (SIG_ATOMIC_TYPE)));
4865 TREE_TYPE (identifier_global_value (c_get_ident (INT8_TYPE)));
4868 TREE_TYPE (identifier_global_value (c_get_ident (INT16_TYPE)));
4871 TREE_TYPE (identifier_global_value (c_get_ident (INT32_TYPE)));
4874 TREE_TYPE (identifier_global_value (c_get_ident (INT64_TYPE)));
4877 TREE_TYPE (identifier_global_value (c_get_ident (UINT8_TYPE)));
4880 TREE_TYPE (identifier_global_value (c_get_ident (UINT16_TYPE)));
4882 c_uint32_type_node =
4883 TREE_TYPE (identifier_global_value (c_get_ident (UINT32_TYPE)));
4885 c_uint64_type_node =
4886 TREE_TYPE (identifier_global_value (c_get_ident (UINT64_TYPE)));
4887 if (INT_LEAST8_TYPE)
4888 int_least8_type_node =
4889 TREE_TYPE (identifier_global_value (c_get_ident (INT_LEAST8_TYPE)));
4890 if (INT_LEAST16_TYPE)
4891 int_least16_type_node =
4892 TREE_TYPE (identifier_global_value (c_get_ident (INT_LEAST16_TYPE)));
4893 if (INT_LEAST32_TYPE)
4894 int_least32_type_node =
4895 TREE_TYPE (identifier_global_value (c_get_ident (INT_LEAST32_TYPE)));
4896 if (INT_LEAST64_TYPE)
4897 int_least64_type_node =
4898 TREE_TYPE (identifier_global_value (c_get_ident (INT_LEAST64_TYPE)));
4899 if (UINT_LEAST8_TYPE)
4900 uint_least8_type_node =
4901 TREE_TYPE (identifier_global_value (c_get_ident (UINT_LEAST8_TYPE)));
4902 if (UINT_LEAST16_TYPE)
4903 uint_least16_type_node =
4904 TREE_TYPE (identifier_global_value (c_get_ident (UINT_LEAST16_TYPE)));
4905 if (UINT_LEAST32_TYPE)
4906 uint_least32_type_node =
4907 TREE_TYPE (identifier_global_value (c_get_ident (UINT_LEAST32_TYPE)));
4908 if (UINT_LEAST64_TYPE)
4909 uint_least64_type_node =
4910 TREE_TYPE (identifier_global_value (c_get_ident (UINT_LEAST64_TYPE)));
4912 int_fast8_type_node =
4913 TREE_TYPE (identifier_global_value (c_get_ident (INT_FAST8_TYPE)));
4914 if (INT_FAST16_TYPE)
4915 int_fast16_type_node =
4916 TREE_TYPE (identifier_global_value (c_get_ident (INT_FAST16_TYPE)));
4917 if (INT_FAST32_TYPE)
4918 int_fast32_type_node =
4919 TREE_TYPE (identifier_global_value (c_get_ident (INT_FAST32_TYPE)));
4920 if (INT_FAST64_TYPE)
4921 int_fast64_type_node =
4922 TREE_TYPE (identifier_global_value (c_get_ident (INT_FAST64_TYPE)));
4923 if (UINT_FAST8_TYPE)
4924 uint_fast8_type_node =
4925 TREE_TYPE (identifier_global_value (c_get_ident (UINT_FAST8_TYPE)));
4926 if (UINT_FAST16_TYPE)
4927 uint_fast16_type_node =
4928 TREE_TYPE (identifier_global_value (c_get_ident (UINT_FAST16_TYPE)));
4929 if (UINT_FAST32_TYPE)
4930 uint_fast32_type_node =
4931 TREE_TYPE (identifier_global_value (c_get_ident (UINT_FAST32_TYPE)));
4932 if (UINT_FAST64_TYPE)
4933 uint_fast64_type_node =
4934 TREE_TYPE (identifier_global_value (c_get_ident (UINT_FAST64_TYPE)));
4937 TREE_TYPE (identifier_global_value (c_get_ident (INTPTR_TYPE)));
4940 TREE_TYPE (identifier_global_value (c_get_ident (UINTPTR_TYPE)));
4942 default_function_type = build_function_type (integer_type_node, NULL_TREE);
4944 = TREE_TYPE (identifier_global_value (get_identifier (PTRDIFF_TYPE)));
4945 unsigned_ptrdiff_type_node = c_common_unsigned_type (ptrdiff_type_node);
4947 lang_hooks.decls.pushdecl
4948 (build_decl (UNKNOWN_LOCATION,
4949 TYPE_DECL, get_identifier ("__builtin_va_list"),
4950 va_list_type_node));
4951 #ifdef TARGET_ENUM_VA_LIST
4956 for (l = 0; TARGET_ENUM_VA_LIST (l, &pname, &ptype); ++l)
4958 lang_hooks.decls.pushdecl
4959 (build_decl (UNKNOWN_LOCATION,
4960 TYPE_DECL, get_identifier (pname),
4967 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
4969 va_list_arg_type_node = va_list_ref_type_node =
4970 build_pointer_type (TREE_TYPE (va_list_type_node));
4974 va_list_arg_type_node = va_list_type_node;
4975 va_list_ref_type_node = build_reference_type (va_list_type_node);
4978 if (!flag_preprocess_only)
4979 c_define_builtins (va_list_ref_type_node, va_list_arg_type_node);
4981 main_identifier_node = get_identifier ("main");
4983 /* Create the built-in __null node. It is important that this is
4985 null_node = make_node (INTEGER_CST);
4986 TREE_TYPE (null_node) = c_common_type_for_size (POINTER_SIZE, 0);
4988 /* Since builtin_types isn't gc'ed, don't export these nodes. */
4989 memset (builtin_types, 0, sizeof (builtin_types));
4992 /* Look up the function in built_in_decls that corresponds to DECL
4993 and set ASMSPEC as its user assembler name. DECL must be a
4994 function decl that declares a builtin. */
4997 set_builtin_user_assembler_name (tree decl, const char *asmspec)
5000 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
5001 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
5004 builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
5005 set_user_assembler_name (builtin, asmspec);
5006 switch (DECL_FUNCTION_CODE (decl))
5008 case BUILT_IN_MEMCPY:
5009 init_block_move_fn (asmspec);
5010 memcpy_libfunc = set_user_assembler_libfunc ("memcpy", asmspec);
5012 case BUILT_IN_MEMSET:
5013 init_block_clear_fn (asmspec);
5014 memset_libfunc = set_user_assembler_libfunc ("memset", asmspec);
5016 case BUILT_IN_MEMMOVE:
5017 memmove_libfunc = set_user_assembler_libfunc ("memmove", asmspec);
5019 case BUILT_IN_MEMCMP:
5020 memcmp_libfunc = set_user_assembler_libfunc ("memcmp", asmspec);
5022 case BUILT_IN_ABORT:
5023 abort_libfunc = set_user_assembler_libfunc ("abort", asmspec);
5030 /* The number of named compound-literals generated thus far. */
5031 static GTY(()) int compound_literal_number;
5033 /* Set DECL_NAME for DECL, a VAR_DECL for a compound-literal. */
5036 set_compound_literal_name (tree decl)
5039 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
5040 compound_literal_number);
5041 compound_literal_number++;
5042 DECL_NAME (decl) = get_identifier (name);
5046 build_va_arg (location_t loc, tree expr, tree type)
5048 expr = build1 (VA_ARG_EXPR, type, expr);
5049 SET_EXPR_LOCATION (expr, loc);
5054 /* Linked list of disabled built-in functions. */
5056 typedef struct disabled_builtin
5059 struct disabled_builtin *next;
5061 static disabled_builtin *disabled_builtins = NULL;
5063 static bool builtin_function_disabled_p (const char *);
5065 /* Disable a built-in function specified by -fno-builtin-NAME. If NAME
5066 begins with "__builtin_", give an error. */
5069 disable_builtin_function (const char *name)
5071 if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0)
5072 error ("cannot disable built-in function %qs", name);
5075 disabled_builtin *new_disabled_builtin = XNEW (disabled_builtin);
5076 new_disabled_builtin->name = name;
5077 new_disabled_builtin->next = disabled_builtins;
5078 disabled_builtins = new_disabled_builtin;
5083 /* Return true if the built-in function NAME has been disabled, false
5087 builtin_function_disabled_p (const char *name)
5089 disabled_builtin *p;
5090 for (p = disabled_builtins; p != NULL; p = p->next)
5092 if (strcmp (name, p->name) == 0)
5099 /* Worker for DEF_BUILTIN.
5100 Possibly define a builtin function with one or two names.
5101 Does not declare a non-__builtin_ function if flag_no_builtin, or if
5102 nonansi_p and flag_no_nonansi_builtin. */
5105 def_builtin_1 (enum built_in_function fncode,
5107 enum built_in_class fnclass,
5108 tree fntype, tree libtype,
5109 bool both_p, bool fallback_p, bool nonansi_p,
5110 tree fnattrs, bool implicit_p)
5113 const char *libname;
5115 if (fntype == error_mark_node)
5118 gcc_assert ((!both_p && !fallback_p)
5119 || !strncmp (name, "__builtin_",
5120 strlen ("__builtin_")));
5122 libname = name + strlen ("__builtin_");
5123 decl = add_builtin_function (name, fntype, fncode, fnclass,
5124 (fallback_p ? libname : NULL),
5127 && !flag_no_builtin && !builtin_function_disabled_p (libname)
5128 && !(nonansi_p && flag_no_nonansi_builtin))
5129 add_builtin_function (libname, libtype, fncode, fnclass,
5132 built_in_decls[(int) fncode] = decl;
5134 implicit_built_in_decls[(int) fncode] = decl;
5137 /* Nonzero if the type T promotes to int. This is (nearly) the
5138 integral promotions defined in ISO C99 6.3.1.1/2. */
5141 c_promoting_integer_type_p (const_tree t)
5143 switch (TREE_CODE (t))
5146 return (TYPE_MAIN_VARIANT (t) == char_type_node
5147 || TYPE_MAIN_VARIANT (t) == signed_char_type_node
5148 || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node
5149 || TYPE_MAIN_VARIANT (t) == short_integer_type_node
5150 || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node
5151 || TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node));
5154 /* ??? Technically all enumerations not larger than an int
5155 promote to an int. But this is used along code paths
5156 that only want to notice a size change. */
5157 return TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node);
5167 /* Return 1 if PARMS specifies a fixed number of parameters
5168 and none of their types is affected by default promotions. */
5171 self_promoting_args_p (const_tree parms)
5174 for (t = parms; t; t = TREE_CHAIN (t))
5176 tree type = TREE_VALUE (t);
5178 if (type == error_mark_node)
5181 if (TREE_CHAIN (t) == 0 && type != void_type_node)
5187 if (TYPE_MAIN_VARIANT (type) == float_type_node)
5190 if (c_promoting_integer_type_p (type))
5196 /* Recursively remove any '*' or '&' operator from TYPE. */
5198 strip_pointer_operator (tree t)
5200 while (POINTER_TYPE_P (t))
5205 /* Recursively remove pointer or array type from TYPE. */
5207 strip_pointer_or_array_types (tree t)
5209 while (TREE_CODE (t) == ARRAY_TYPE || POINTER_TYPE_P (t))
5214 /* Used to compare case labels. K1 and K2 are actually tree nodes
5215 representing case labels, or NULL_TREE for a `default' label.
5216 Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after
5217 K2, and 0 if K1 and K2 are equal. */
5220 case_compare (splay_tree_key k1, splay_tree_key k2)
5222 /* Consider a NULL key (such as arises with a `default' label) to be
5223 smaller than anything else. */
5229 return tree_int_cst_compare ((tree) k1, (tree) k2);
5232 /* Process a case label, located at LOC, for the range LOW_VALUE
5233 ... HIGH_VALUE. If LOW_VALUE and HIGH_VALUE are both NULL_TREE
5234 then this case label is actually a `default' label. If only
5235 HIGH_VALUE is NULL_TREE, then case label was declared using the
5236 usual C/C++ syntax, rather than the GNU case range extension.
5237 CASES is a tree containing all the case ranges processed so far;
5238 COND is the condition for the switch-statement itself. Returns the
5239 CASE_LABEL_EXPR created, or ERROR_MARK_NODE if no CASE_LABEL_EXPR
5243 c_add_case_label (location_t loc, splay_tree cases, tree cond, tree orig_type,
5244 tree low_value, tree high_value)
5249 splay_tree_node node;
5251 /* Create the LABEL_DECL itself. */
5252 label = create_artificial_label (loc);
5254 /* If there was an error processing the switch condition, bail now
5255 before we get more confused. */
5256 if (!cond || cond == error_mark_node)
5259 if ((low_value && TREE_TYPE (low_value)
5260 && POINTER_TYPE_P (TREE_TYPE (low_value)))
5261 || (high_value && TREE_TYPE (high_value)
5262 && POINTER_TYPE_P (TREE_TYPE (high_value))))
5264 error_at (loc, "pointers are not permitted as case values");
5268 /* Case ranges are a GNU extension. */
5270 pedwarn (loc, OPT_pedantic,
5271 "range expressions in switch statements are non-standard");
5273 type = TREE_TYPE (cond);
5276 low_value = check_case_value (low_value);
5277 low_value = convert_and_check (type, low_value);
5278 if (low_value == error_mark_node)
5283 high_value = check_case_value (high_value);
5284 high_value = convert_and_check (type, high_value);
5285 if (high_value == error_mark_node)
5289 if (low_value && high_value)
5291 /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't
5292 really a case range, even though it was written that way.
5293 Remove the HIGH_VALUE to simplify later processing. */
5294 if (tree_int_cst_equal (low_value, high_value))
5295 high_value = NULL_TREE;
5296 else if (!tree_int_cst_lt (low_value, high_value))
5297 warning_at (loc, 0, "empty range specified");
5300 /* See if the case is in range of the type of the original testing
5301 expression. If both low_value and high_value are out of range,
5302 don't insert the case label and return NULL_TREE. */
5304 && !check_case_bounds (type, orig_type,
5305 &low_value, high_value ? &high_value : NULL))
5308 /* Look up the LOW_VALUE in the table of case labels we already
5310 node = splay_tree_lookup (cases, (splay_tree_key) low_value);
5311 /* If there was not an exact match, check for overlapping ranges.
5312 There's no need to do this if there's no LOW_VALUE or HIGH_VALUE;
5313 that's a `default' label and the only overlap is an exact match. */
5314 if (!node && (low_value || high_value))
5316 splay_tree_node low_bound;
5317 splay_tree_node high_bound;
5319 /* Even though there wasn't an exact match, there might be an
5320 overlap between this case range and another case range.
5321 Since we've (inductively) not allowed any overlapping case
5322 ranges, we simply need to find the greatest low case label
5323 that is smaller that LOW_VALUE, and the smallest low case
5324 label that is greater than LOW_VALUE. If there is an overlap
5325 it will occur in one of these two ranges. */
5326 low_bound = splay_tree_predecessor (cases,
5327 (splay_tree_key) low_value);
5328 high_bound = splay_tree_successor (cases,
5329 (splay_tree_key) low_value);
5331 /* Check to see if the LOW_BOUND overlaps. It is smaller than
5332 the LOW_VALUE, so there is no need to check unless the
5333 LOW_BOUND is in fact itself a case range. */
5335 && CASE_HIGH ((tree) low_bound->value)
5336 && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value),
5339 /* Check to see if the HIGH_BOUND overlaps. The low end of that
5340 range is bigger than the low end of the current range, so we
5341 are only interested if the current range is a real range, and
5342 not an ordinary case label. */
5345 && (tree_int_cst_compare ((tree) high_bound->key,
5350 /* If there was an overlap, issue an error. */
5353 tree duplicate = CASE_LABEL ((tree) node->value);
5357 error_at (loc, "duplicate (or overlapping) case value");
5358 error_at (DECL_SOURCE_LOCATION (duplicate),
5359 "this is the first entry overlapping that value");
5363 error_at (loc, "duplicate case value") ;
5364 error_at (DECL_SOURCE_LOCATION (duplicate), "previously used here");
5368 error_at (loc, "multiple default labels in one switch");
5369 error_at (DECL_SOURCE_LOCATION (duplicate),
5370 "this is the first default label");
5375 /* Add a CASE_LABEL to the statement-tree. */
5376 case_label = add_stmt (build_case_label (loc, low_value, high_value, label));
5377 /* Register this case label in the splay tree. */
5378 splay_tree_insert (cases,
5379 (splay_tree_key) low_value,
5380 (splay_tree_value) case_label);
5385 /* Add a label so that the back-end doesn't think that the beginning of
5386 the switch is unreachable. Note that we do not add a case label, as
5387 that just leads to duplicates and thence to failure later on. */
5390 tree t = create_artificial_label (loc);
5391 add_stmt (build_stmt (loc, LABEL_EXPR, t));
5393 return error_mark_node;
5396 /* Subroutines of c_do_switch_warnings, called via splay_tree_foreach.
5397 Used to verify that case values match up with enumerator values. */
5400 match_case_to_enum_1 (tree key, tree type, tree label)
5402 char buf[2 + 2*HOST_BITS_PER_WIDE_INT/4 + 1];
5404 /* ??? Not working too hard to print the double-word value.
5405 Should perhaps be done with %lwd in the diagnostic routines? */
5406 if (TREE_INT_CST_HIGH (key) == 0)
5407 snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_UNSIGNED,
5408 TREE_INT_CST_LOW (key));
5409 else if (!TYPE_UNSIGNED (type)
5410 && TREE_INT_CST_HIGH (key) == -1
5411 && TREE_INT_CST_LOW (key) != 0)
5412 snprintf (buf, sizeof (buf), "-" HOST_WIDE_INT_PRINT_UNSIGNED,
5413 -TREE_INT_CST_LOW (key));
5415 snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_DOUBLE_HEX,
5416 (unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (key),
5417 (unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (key));
5419 if (TYPE_NAME (type) == 0)
5420 warning (warn_switch ? OPT_Wswitch : OPT_Wswitch_enum,
5421 "%Jcase value %qs not in enumerated type",
5422 CASE_LABEL (label), buf);
5424 warning (warn_switch ? OPT_Wswitch : OPT_Wswitch_enum,
5425 "%Jcase value %qs not in enumerated type %qT",
5426 CASE_LABEL (label), buf, type);
5429 /* Subroutine of c_do_switch_warnings, called via splay_tree_foreach.
5430 Used to verify that case values match up with enumerator values. */
5433 match_case_to_enum (splay_tree_node node, void *data)
5435 tree label = (tree) node->value;
5436 tree type = (tree) data;
5438 /* Skip default case. */
5439 if (!CASE_LOW (label))
5442 /* If CASE_LOW_SEEN is not set, that means CASE_LOW did not appear
5443 when we did our enum->case scan. Reset our scratch bit after. */
5444 if (!CASE_LOW_SEEN (label))
5445 match_case_to_enum_1 (CASE_LOW (label), type, label);
5447 CASE_LOW_SEEN (label) = 0;
5449 /* If CASE_HIGH is non-null, we have a range. If CASE_HIGH_SEEN is
5450 not set, that means that CASE_HIGH did not appear when we did our
5451 enum->case scan. Reset our scratch bit after. */
5452 if (CASE_HIGH (label))
5454 if (!CASE_HIGH_SEEN (label))
5455 match_case_to_enum_1 (CASE_HIGH (label), type, label);
5457 CASE_HIGH_SEEN (label) = 0;
5463 /* Handle -Wswitch*. Called from the front end after parsing the
5464 switch construct. */
5465 /* ??? Should probably be somewhere generic, since other languages
5466 besides C and C++ would want this. At the moment, however, C/C++
5467 are the only tree-ssa languages that support enumerations at all,
5468 so the point is moot. */
5471 c_do_switch_warnings (splay_tree cases, location_t switch_location,
5472 tree type, tree cond)
5474 splay_tree_node default_node;
5475 splay_tree_node node;
5478 if (!warn_switch && !warn_switch_enum && !warn_switch_default)
5481 default_node = splay_tree_lookup (cases, (splay_tree_key) NULL);
5483 warning (OPT_Wswitch_default, "%Hswitch missing default case",
5486 /* From here on, we only care about about enumerated types. */
5487 if (!type || TREE_CODE (type) != ENUMERAL_TYPE)
5490 /* From here on, we only care about -Wswitch and -Wswitch-enum. */
5491 if (!warn_switch_enum && !warn_switch)
5494 /* Check the cases. Warn about case values which are not members of
5495 the enumerated type. For -Wswitch-enum, or for -Wswitch when
5496 there is no default case, check that exactly all enumeration
5497 literals are covered by the cases. */
5499 /* Clearing COND if it is not an integer constant simplifies
5500 the tests inside the loop below. */
5501 if (TREE_CODE (cond) != INTEGER_CST)
5504 /* The time complexity here is O(N*lg(N)) worst case, but for the
5505 common case of monotonically increasing enumerators, it is
5506 O(N), since the nature of the splay tree will keep the next
5507 element adjacent to the root at all times. */
5509 for (chain = TYPE_VALUES (type); chain; chain = TREE_CHAIN (chain))
5511 tree value = TREE_VALUE (chain);
5512 if (TREE_CODE (value) == CONST_DECL)
5513 value = DECL_INITIAL (value);
5514 node = splay_tree_lookup (cases, (splay_tree_key) value);
5517 /* Mark the CASE_LOW part of the case entry as seen. */
5518 tree label = (tree) node->value;
5519 CASE_LOW_SEEN (label) = 1;
5523 /* Even though there wasn't an exact match, there might be a
5524 case range which includes the enumerator's value. */
5525 node = splay_tree_predecessor (cases, (splay_tree_key) value);
5526 if (node && CASE_HIGH ((tree) node->value))
5528 tree label = (tree) node->value;
5529 int cmp = tree_int_cst_compare (CASE_HIGH (label), value);
5532 /* If we match the upper bound exactly, mark the CASE_HIGH
5533 part of the case entry as seen. */
5535 CASE_HIGH_SEEN (label) = 1;
5540 /* We've now determined that this enumerated literal isn't
5541 handled by the case labels of the switch statement. */
5543 /* If the switch expression is a constant, we only really care
5544 about whether that constant is handled by the switch. */
5545 if (cond && tree_int_cst_compare (cond, value))
5548 /* If there is a default_node, the only relevant option is
5549 Wswitch-enum. Otherwise, if both are enabled then we prefer
5550 to warn using -Wswitch because -Wswitch is enabled by -Wall
5551 while -Wswitch-enum is explicit. */
5552 warning_at (switch_location,
5553 (default_node || !warn_switch
5556 "enumeration value %qE not handled in switch",
5557 TREE_PURPOSE (chain));
5560 /* Warn if there are case expressions that don't correspond to
5561 enumerators. This can occur since C and C++ don't enforce
5562 type-checking of assignments to enumeration variables.
5564 The time complexity here is now always O(N) worst case, since
5565 we should have marked both the lower bound and upper bound of
5566 every disjoint case label, with CASE_LOW_SEEN and CASE_HIGH_SEEN
5567 above. This scan also resets those fields. */
5569 splay_tree_foreach (cases, match_case_to_enum, type);
5572 /* Finish an expression taking the address of LABEL (an
5573 IDENTIFIER_NODE). Returns an expression for the address.
5575 LOC is the location for the expression returned. */
5578 finish_label_address_expr (tree label, location_t loc)
5582 pedwarn (input_location, OPT_pedantic, "taking the address of a label is non-standard");
5584 if (label == error_mark_node)
5585 return error_mark_node;
5587 label = lookup_label (label);
5588 if (label == NULL_TREE)
5589 result = null_pointer_node;
5592 TREE_USED (label) = 1;
5593 result = build1 (ADDR_EXPR, ptr_type_node, label);
5594 /* The current function in not necessarily uninlinable.
5595 Computed gotos are incompatible with inlining, but the value
5596 here could be used only in a diagnostic, for example. */
5597 protected_set_expr_location (result, loc);
5604 /* Given a boolean expression ARG, return a tree representing an increment
5605 or decrement (as indicated by CODE) of ARG. The front end must check for
5606 invalid cases (e.g., decrement in C++). */
5608 boolean_increment (enum tree_code code, tree arg)
5611 tree true_res = build_int_cst (TREE_TYPE (arg), 1);
5613 arg = stabilize_reference (arg);
5616 case PREINCREMENT_EXPR:
5617 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res);
5619 case POSTINCREMENT_EXPR:
5620 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res);
5621 arg = save_expr (arg);
5622 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg);
5623 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val);
5625 case PREDECREMENT_EXPR:
5626 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg,
5627 invert_truthvalue (arg));
5629 case POSTDECREMENT_EXPR:
5630 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg,
5631 invert_truthvalue (arg));
5632 arg = save_expr (arg);
5633 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg);
5634 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val);
5639 TREE_SIDE_EFFECTS (val) = 1;
5643 /* Built-in macros for stddef.h and stdint.h, that require macros
5644 defined in this file. */
5646 c_stddef_cpp_builtins(void)
5648 builtin_define_with_value ("__SIZE_TYPE__", SIZE_TYPE, 0);
5649 builtin_define_with_value ("__PTRDIFF_TYPE__", PTRDIFF_TYPE, 0);
5650 builtin_define_with_value ("__WCHAR_TYPE__", MODIFIED_WCHAR_TYPE, 0);
5651 builtin_define_with_value ("__WINT_TYPE__", WINT_TYPE, 0);
5652 builtin_define_with_value ("__INTMAX_TYPE__", INTMAX_TYPE, 0);
5653 builtin_define_with_value ("__UINTMAX_TYPE__", UINTMAX_TYPE, 0);
5654 builtin_define_with_value ("__CHAR16_TYPE__", CHAR16_TYPE, 0);
5655 builtin_define_with_value ("__CHAR32_TYPE__", CHAR32_TYPE, 0);
5656 if (SIG_ATOMIC_TYPE)
5657 builtin_define_with_value ("__SIG_ATOMIC_TYPE__", SIG_ATOMIC_TYPE, 0);
5659 builtin_define_with_value ("__INT8_TYPE__", INT8_TYPE, 0);
5661 builtin_define_with_value ("__INT16_TYPE__", INT16_TYPE, 0);
5663 builtin_define_with_value ("__INT32_TYPE__", INT32_TYPE, 0);
5665 builtin_define_with_value ("__INT64_TYPE__", INT64_TYPE, 0);
5667 builtin_define_with_value ("__UINT8_TYPE__", UINT8_TYPE, 0);
5669 builtin_define_with_value ("__UINT16_TYPE__", UINT16_TYPE, 0);
5671 builtin_define_with_value ("__UINT32_TYPE__", UINT32_TYPE, 0);
5673 builtin_define_with_value ("__UINT64_TYPE__", UINT64_TYPE, 0);
5674 if (INT_LEAST8_TYPE)
5675 builtin_define_with_value ("__INT_LEAST8_TYPE__", INT_LEAST8_TYPE, 0);
5676 if (INT_LEAST16_TYPE)
5677 builtin_define_with_value ("__INT_LEAST16_TYPE__", INT_LEAST16_TYPE, 0);
5678 if (INT_LEAST32_TYPE)
5679 builtin_define_with_value ("__INT_LEAST32_TYPE__", INT_LEAST32_TYPE, 0);
5680 if (INT_LEAST64_TYPE)
5681 builtin_define_with_value ("__INT_LEAST64_TYPE__", INT_LEAST64_TYPE, 0);
5682 if (UINT_LEAST8_TYPE)
5683 builtin_define_with_value ("__UINT_LEAST8_TYPE__", UINT_LEAST8_TYPE, 0);
5684 if (UINT_LEAST16_TYPE)
5685 builtin_define_with_value ("__UINT_LEAST16_TYPE__", UINT_LEAST16_TYPE, 0);
5686 if (UINT_LEAST32_TYPE)
5687 builtin_define_with_value ("__UINT_LEAST32_TYPE__", UINT_LEAST32_TYPE, 0);
5688 if (UINT_LEAST64_TYPE)
5689 builtin_define_with_value ("__UINT_LEAST64_TYPE__", UINT_LEAST64_TYPE, 0);
5691 builtin_define_with_value ("__INT_FAST8_TYPE__", INT_FAST8_TYPE, 0);
5692 if (INT_FAST16_TYPE)
5693 builtin_define_with_value ("__INT_FAST16_TYPE__", INT_FAST16_TYPE, 0);
5694 if (INT_FAST32_TYPE)
5695 builtin_define_with_value ("__INT_FAST32_TYPE__", INT_FAST32_TYPE, 0);
5696 if (INT_FAST64_TYPE)
5697 builtin_define_with_value ("__INT_FAST64_TYPE__", INT_FAST64_TYPE, 0);
5698 if (UINT_FAST8_TYPE)
5699 builtin_define_with_value ("__UINT_FAST8_TYPE__", UINT_FAST8_TYPE, 0);
5700 if (UINT_FAST16_TYPE)
5701 builtin_define_with_value ("__UINT_FAST16_TYPE__", UINT_FAST16_TYPE, 0);
5702 if (UINT_FAST32_TYPE)
5703 builtin_define_with_value ("__UINT_FAST32_TYPE__", UINT_FAST32_TYPE, 0);
5704 if (UINT_FAST64_TYPE)
5705 builtin_define_with_value ("__UINT_FAST64_TYPE__", UINT_FAST64_TYPE, 0);
5707 builtin_define_with_value ("__INTPTR_TYPE__", INTPTR_TYPE, 0);
5709 builtin_define_with_value ("__UINTPTR_TYPE__", UINTPTR_TYPE, 0);
5713 c_init_attributes (void)
5715 /* Fill in the built_in_attributes array. */
5716 #define DEF_ATTR_NULL_TREE(ENUM) \
5717 built_in_attributes[(int) ENUM] = NULL_TREE;
5718 #define DEF_ATTR_INT(ENUM, VALUE) \
5719 built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE);
5720 #define DEF_ATTR_IDENT(ENUM, STRING) \
5721 built_in_attributes[(int) ENUM] = get_identifier (STRING);
5722 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \
5723 built_in_attributes[(int) ENUM] \
5724 = tree_cons (built_in_attributes[(int) PURPOSE], \
5725 built_in_attributes[(int) VALUE], \
5726 built_in_attributes[(int) CHAIN]);
5727 #include "builtin-attrs.def"
5728 #undef DEF_ATTR_NULL_TREE
5730 #undef DEF_ATTR_IDENT
5731 #undef DEF_ATTR_TREE_LIST
5734 /* Attribute handlers common to C front ends. */
5736 /* Handle a "packed" attribute; arguments as in
5737 struct attribute_spec.handler. */
5740 handle_packed_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5741 int flags, bool *no_add_attrs)
5745 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
5746 *node = build_variant_type_copy (*node);
5747 TYPE_PACKED (*node) = 1;
5749 else if (TREE_CODE (*node) == FIELD_DECL)
5751 if (TYPE_ALIGN (TREE_TYPE (*node)) <= BITS_PER_UNIT
5752 /* Still pack bitfields. */
5753 && ! DECL_INITIAL (*node))
5754 warning (OPT_Wattributes,
5755 "%qE attribute ignored for field of type %qT",
5756 name, TREE_TYPE (*node));
5758 DECL_PACKED (*node) = 1;
5760 /* We can't set DECL_PACKED for a VAR_DECL, because the bit is
5761 used for DECL_REGISTER. It wouldn't mean anything anyway.
5762 We can't set DECL_PACKED on the type of a TYPE_DECL, because
5763 that changes what the typedef is typing. */
5766 warning (OPT_Wattributes, "%qE attribute ignored", name);
5767 *no_add_attrs = true;
5773 /* Handle a "nocommon" attribute; arguments as in
5774 struct attribute_spec.handler. */
5777 handle_nocommon_attribute (tree *node, tree name,
5778 tree ARG_UNUSED (args),
5779 int ARG_UNUSED (flags), bool *no_add_attrs)
5781 if (TREE_CODE (*node) == VAR_DECL)
5782 DECL_COMMON (*node) = 0;
5785 warning (OPT_Wattributes, "%qE attribute ignored", name);
5786 *no_add_attrs = true;
5792 /* Handle a "common" attribute; arguments as in
5793 struct attribute_spec.handler. */
5796 handle_common_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5797 int ARG_UNUSED (flags), bool *no_add_attrs)
5799 if (TREE_CODE (*node) == VAR_DECL)
5800 DECL_COMMON (*node) = 1;
5803 warning (OPT_Wattributes, "%qE attribute ignored", name);
5804 *no_add_attrs = true;
5810 /* Handle a "noreturn" attribute; arguments as in
5811 struct attribute_spec.handler. */
5814 handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5815 int ARG_UNUSED (flags), bool *no_add_attrs)
5817 tree type = TREE_TYPE (*node);
5819 /* See FIXME comment in c_common_attribute_table. */
5820 if (TREE_CODE (*node) == FUNCTION_DECL)
5821 TREE_THIS_VOLATILE (*node) = 1;
5822 else if (TREE_CODE (type) == POINTER_TYPE
5823 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
5825 = build_pointer_type
5826 (build_type_variant (TREE_TYPE (type),
5827 TYPE_READONLY (TREE_TYPE (type)), 1));
5830 warning (OPT_Wattributes, "%qE attribute ignored", name);
5831 *no_add_attrs = true;
5837 /* Handle a "hot" and attribute; arguments as in
5838 struct attribute_spec.handler. */
5841 handle_hot_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5842 int ARG_UNUSED (flags), bool *no_add_attrs)
5844 if (TREE_CODE (*node) == FUNCTION_DECL)
5846 if (lookup_attribute ("cold", DECL_ATTRIBUTES (*node)) != NULL)
5848 warning (OPT_Wattributes, "%qE attribute conflicts with attribute %s",
5850 *no_add_attrs = true;
5852 /* Most of the rest of the hot processing is done later with
5853 lookup_attribute. */
5857 warning (OPT_Wattributes, "%qE attribute ignored", name);
5858 *no_add_attrs = true;
5863 /* Handle a "cold" and attribute; arguments as in
5864 struct attribute_spec.handler. */
5867 handle_cold_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5868 int ARG_UNUSED (flags), bool *no_add_attrs)
5870 if (TREE_CODE (*node) == FUNCTION_DECL)
5872 if (lookup_attribute ("hot", DECL_ATTRIBUTES (*node)) != NULL)
5874 warning (OPT_Wattributes, "%qE attribute conflicts with attribute %s",
5876 *no_add_attrs = true;
5878 /* Most of the rest of the cold processing is done later with
5879 lookup_attribute. */
5883 warning (OPT_Wattributes, "%qE attribute ignored", name);
5884 *no_add_attrs = true;
5890 /* Handle a "noinline" attribute; arguments as in
5891 struct attribute_spec.handler. */
5894 handle_noinline_attribute (tree *node, tree name,
5895 tree ARG_UNUSED (args),
5896 int ARG_UNUSED (flags), bool *no_add_attrs)
5898 if (TREE_CODE (*node) == FUNCTION_DECL)
5899 DECL_UNINLINABLE (*node) = 1;
5902 warning (OPT_Wattributes, "%qE attribute ignored", name);
5903 *no_add_attrs = true;
5909 /* Handle a "always_inline" attribute; arguments as in
5910 struct attribute_spec.handler. */
5913 handle_always_inline_attribute (tree *node, tree name,
5914 tree ARG_UNUSED (args),
5915 int ARG_UNUSED (flags),
5918 if (TREE_CODE (*node) == FUNCTION_DECL)
5920 /* Set the attribute and mark it for disregarding inline
5922 DECL_DISREGARD_INLINE_LIMITS (*node) = 1;
5926 warning (OPT_Wattributes, "%qE attribute ignored", name);
5927 *no_add_attrs = true;
5933 /* Handle a "gnu_inline" attribute; arguments as in
5934 struct attribute_spec.handler. */
5937 handle_gnu_inline_attribute (tree *node, tree name,
5938 tree ARG_UNUSED (args),
5939 int ARG_UNUSED (flags),
5942 if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node))
5944 /* Do nothing else, just set the attribute. We'll get at
5945 it later with lookup_attribute. */
5949 warning (OPT_Wattributes, "%qE attribute ignored", name);
5950 *no_add_attrs = true;
5956 /* Handle an "artificial" attribute; arguments as in
5957 struct attribute_spec.handler. */
5960 handle_artificial_attribute (tree *node, tree name,
5961 tree ARG_UNUSED (args),
5962 int ARG_UNUSED (flags),
5965 if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node))
5967 /* Do nothing else, just set the attribute. We'll get at
5968 it later with lookup_attribute. */
5972 warning (OPT_Wattributes, "%qE attribute ignored", name);
5973 *no_add_attrs = true;
5979 /* Handle a "flatten" attribute; arguments as in
5980 struct attribute_spec.handler. */
5983 handle_flatten_attribute (tree *node, tree name,
5984 tree args ATTRIBUTE_UNUSED,
5985 int flags ATTRIBUTE_UNUSED, bool *no_add_attrs)
5987 if (TREE_CODE (*node) == FUNCTION_DECL)
5988 /* Do nothing else, just set the attribute. We'll get at
5989 it later with lookup_attribute. */
5993 warning (OPT_Wattributes, "%qE attribute ignored", name);
5994 *no_add_attrs = true;
6000 /* Handle a "warning" or "error" attribute; arguments as in
6001 struct attribute_spec.handler. */
6004 handle_error_attribute (tree *node, tree name, tree args,
6005 int ARG_UNUSED (flags), bool *no_add_attrs)
6007 if (TREE_CODE (*node) == FUNCTION_DECL
6008 || TREE_CODE (TREE_VALUE (args)) == STRING_CST)
6009 /* Do nothing else, just set the attribute. We'll get at
6010 it later with lookup_attribute. */
6014 warning (OPT_Wattributes, "%qE attribute ignored", name);
6015 *no_add_attrs = true;
6021 /* Handle a "used" attribute; arguments as in
6022 struct attribute_spec.handler. */
6025 handle_used_attribute (tree *pnode, tree name, tree ARG_UNUSED (args),
6026 int ARG_UNUSED (flags), bool *no_add_attrs)
6030 if (TREE_CODE (node) == FUNCTION_DECL
6031 || (TREE_CODE (node) == VAR_DECL && TREE_STATIC (node)))
6033 TREE_USED (node) = 1;
6034 DECL_PRESERVE_P (node) = 1;
6038 warning (OPT_Wattributes, "%qE attribute ignored", name);
6039 *no_add_attrs = true;
6045 /* Handle a "unused" attribute; arguments as in
6046 struct attribute_spec.handler. */
6049 handle_unused_attribute (tree *node, tree name, tree ARG_UNUSED (args),
6050 int flags, bool *no_add_attrs)
6056 if (TREE_CODE (decl) == PARM_DECL
6057 || TREE_CODE (decl) == VAR_DECL
6058 || TREE_CODE (decl) == FUNCTION_DECL
6059 || TREE_CODE (decl) == LABEL_DECL
6060 || TREE_CODE (decl) == TYPE_DECL)
6061 TREE_USED (decl) = 1;
6064 warning (OPT_Wattributes, "%qE attribute ignored", name);
6065 *no_add_attrs = true;
6070 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
6071 *node = build_variant_type_copy (*node);
6072 TREE_USED (*node) = 1;
6078 /* Handle a "externally_visible" attribute; arguments as in
6079 struct attribute_spec.handler. */
6082 handle_externally_visible_attribute (tree *pnode, tree name,
6083 tree ARG_UNUSED (args),
6084 int ARG_UNUSED (flags),
6089 if (TREE_CODE (node) == FUNCTION_DECL || TREE_CODE (node) == VAR_DECL)
6091 if ((!TREE_STATIC (node) && TREE_CODE (node) != FUNCTION_DECL
6092 && !DECL_EXTERNAL (node)) || !TREE_PUBLIC (node))
6094 warning (OPT_Wattributes,
6095 "%qE attribute have effect only on public objects", name);
6096 *no_add_attrs = true;
6101 warning (OPT_Wattributes, "%qE attribute ignored", name);
6102 *no_add_attrs = true;
6108 /* Handle a "const" attribute; arguments as in
6109 struct attribute_spec.handler. */
6112 handle_const_attribute (tree *node, tree name, tree ARG_UNUSED (args),
6113 int ARG_UNUSED (flags), bool *no_add_attrs)
6115 tree type = TREE_TYPE (*node);
6117 /* See FIXME comment on noreturn in c_common_attribute_table. */
6118 if (TREE_CODE (*node) == FUNCTION_DECL)
6119 TREE_READONLY (*node) = 1;
6120 else if (TREE_CODE (type) == POINTER_TYPE
6121 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
6123 = build_pointer_type
6124 (build_type_variant (TREE_TYPE (type), 1,
6125 TREE_THIS_VOLATILE (TREE_TYPE (type))));
6128 warning (OPT_Wattributes, "%qE attribute ignored", name);
6129 *no_add_attrs = true;
6135 /* Handle a "transparent_union" attribute; arguments as in
6136 struct attribute_spec.handler. */
6139 handle_transparent_union_attribute (tree *node, tree name,
6140 tree ARG_UNUSED (args), int flags,
6145 *no_add_attrs = true;
6147 if (TREE_CODE (*node) == TYPE_DECL)
6148 node = &TREE_TYPE (*node);
6151 if (TREE_CODE (type) == UNION_TYPE)
6153 /* When IN_PLACE is set, leave the check for FIELDS and MODE to
6154 the code in finish_struct. */
6155 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
6157 if (TYPE_FIELDS (type) == NULL_TREE
6158 || TYPE_MODE (type) != DECL_MODE (TYPE_FIELDS (type)))
6161 /* A type variant isn't good enough, since we don't a cast
6162 to such a type removed as a no-op. */
6163 *node = type = build_duplicate_type (type);
6166 TYPE_TRANSPARENT_UNION (type) = 1;
6171 warning (OPT_Wattributes, "%qE attribute ignored", name);
6175 /* Subroutine of handle_{con,de}structor_attribute. Evaluate ARGS to
6176 get the requested priority for a constructor or destructor,
6177 possibly issuing diagnostics for invalid or reserved
6180 static priority_type
6181 get_priority (tree args, bool is_destructor)
6187 return DEFAULT_INIT_PRIORITY;
6189 if (!SUPPORTS_INIT_PRIORITY)
6192 error ("destructor priorities are not supported");
6194 error ("constructor priorities are not supported");
6195 return DEFAULT_INIT_PRIORITY;
6198 arg = TREE_VALUE (args);
6199 if (!host_integerp (arg, /*pos=*/0)
6200 || !INTEGRAL_TYPE_P (TREE_TYPE (arg)))
6203 pri = tree_low_cst (TREE_VALUE (args), /*pos=*/0);
6204 if (pri < 0 || pri > MAX_INIT_PRIORITY)
6207 if (pri <= MAX_RESERVED_INIT_PRIORITY)
6211 "destructor priorities from 0 to %d are reserved "
6212 "for the implementation",
6213 MAX_RESERVED_INIT_PRIORITY);
6216 "constructor priorities from 0 to %d are reserved "
6217 "for the implementation",
6218 MAX_RESERVED_INIT_PRIORITY);
6224 error ("destructor priorities must be integers from 0 to %d inclusive",
6227 error ("constructor priorities must be integers from 0 to %d inclusive",
6229 return DEFAULT_INIT_PRIORITY;
6232 /* Handle a "constructor" attribute; arguments as in
6233 struct attribute_spec.handler. */
6236 handle_constructor_attribute (tree *node, tree name, tree args,
6237 int ARG_UNUSED (flags),
6241 tree type = TREE_TYPE (decl);
6243 if (TREE_CODE (decl) == FUNCTION_DECL
6244 && TREE_CODE (type) == FUNCTION_TYPE
6245 && decl_function_context (decl) == 0)
6247 priority_type priority;
6248 DECL_STATIC_CONSTRUCTOR (decl) = 1;
6249 priority = get_priority (args, /*is_destructor=*/false);
6250 SET_DECL_INIT_PRIORITY (decl, priority);
6251 TREE_USED (decl) = 1;
6255 warning (OPT_Wattributes, "%qE attribute ignored", name);
6256 *no_add_attrs = true;
6262 /* Handle a "destructor" attribute; arguments as in
6263 struct attribute_spec.handler. */
6266 handle_destructor_attribute (tree *node, tree name, tree args,
6267 int ARG_UNUSED (flags),
6271 tree type = TREE_TYPE (decl);
6273 if (TREE_CODE (decl) == FUNCTION_DECL
6274 && TREE_CODE (type) == FUNCTION_TYPE
6275 && decl_function_context (decl) == 0)
6277 priority_type priority;
6278 DECL_STATIC_DESTRUCTOR (decl) = 1;
6279 priority = get_priority (args, /*is_destructor=*/true);
6280 SET_DECL_FINI_PRIORITY (decl, priority);
6281 TREE_USED (decl) = 1;
6285 warning (OPT_Wattributes, "%qE attribute ignored", name);
6286 *no_add_attrs = true;
6292 /* Handle a "mode" attribute; arguments as in
6293 struct attribute_spec.handler. */
6296 handle_mode_attribute (tree *node, tree name, tree args,
6297 int ARG_UNUSED (flags), bool *no_add_attrs)
6300 tree ident = TREE_VALUE (args);
6302 *no_add_attrs = true;
6304 if (TREE_CODE (ident) != IDENTIFIER_NODE)
6305 warning (OPT_Wattributes, "%qE attribute ignored", name);
6309 const char *p = IDENTIFIER_POINTER (ident);
6310 int len = strlen (p);
6311 enum machine_mode mode = VOIDmode;
6315 if (len > 4 && p[0] == '_' && p[1] == '_'
6316 && p[len - 1] == '_' && p[len - 2] == '_')
6318 char *newp = (char *) alloca (len - 1);
6320 strcpy (newp, &p[2]);
6321 newp[len - 4] = '\0';
6325 /* Change this type to have a type with the specified mode.
6326 First check for the special modes. */
6327 if (!strcmp (p, "byte"))
6329 else if (!strcmp (p, "word"))
6331 else if (!strcmp (p, "pointer"))
6333 else if (!strcmp (p, "libgcc_cmp_return"))
6334 mode = targetm.libgcc_cmp_return_mode ();
6335 else if (!strcmp (p, "libgcc_shift_count"))
6336 mode = targetm.libgcc_shift_count_mode ();
6337 else if (!strcmp (p, "unwind_word"))
6338 mode = targetm.unwind_word_mode ();
6340 for (j = 0; j < NUM_MACHINE_MODES; j++)
6341 if (!strcmp (p, GET_MODE_NAME (j)))
6343 mode = (enum machine_mode) j;
6347 if (mode == VOIDmode)
6349 error ("unknown machine mode %qE", ident);
6354 switch (GET_MODE_CLASS (mode))
6357 case MODE_PARTIAL_INT:
6359 case MODE_DECIMAL_FLOAT:
6364 valid_mode = targetm.scalar_mode_supported_p (mode);
6367 case MODE_COMPLEX_INT:
6368 case MODE_COMPLEX_FLOAT:
6369 valid_mode = targetm.scalar_mode_supported_p (GET_MODE_INNER (mode));
6372 case MODE_VECTOR_INT:
6373 case MODE_VECTOR_FLOAT:
6374 case MODE_VECTOR_FRACT:
6375 case MODE_VECTOR_UFRACT:
6376 case MODE_VECTOR_ACCUM:
6377 case MODE_VECTOR_UACCUM:
6378 warning (OPT_Wattributes, "specifying vector types with "
6379 "__attribute__ ((mode)) is deprecated");
6380 warning (OPT_Wattributes,
6381 "use __attribute__ ((vector_size)) instead");
6382 valid_mode = vector_mode_valid_p (mode);
6390 error ("unable to emulate %qs", p);
6394 if (POINTER_TYPE_P (type))
6396 tree (*fn)(tree, enum machine_mode, bool);
6398 if (!targetm.valid_pointer_mode (mode))
6400 error ("invalid pointer mode %qs", p);
6404 if (TREE_CODE (type) == POINTER_TYPE)
6405 fn = build_pointer_type_for_mode;
6407 fn = build_reference_type_for_mode;
6408 typefm = fn (TREE_TYPE (type), mode, false);
6412 /* For fixed-point modes, we need to test if the signness of type
6413 and the machine mode are consistent. */
6414 if (ALL_FIXED_POINT_MODE_P (mode)
6415 && TYPE_UNSIGNED (type) != UNSIGNED_FIXED_POINT_MODE_P (mode))
6417 error ("signness of type and machine mode %qs don't match", p);
6420 /* For fixed-point modes, we need to pass saturating info. */
6421 typefm = lang_hooks.types.type_for_mode (mode,
6422 ALL_FIXED_POINT_MODE_P (mode) ? TYPE_SATURATING (type)
6423 : TYPE_UNSIGNED (type));
6426 if (typefm == NULL_TREE)
6428 error ("no data type for mode %qs", p);
6431 else if (TREE_CODE (type) == ENUMERAL_TYPE)
6433 /* For enumeral types, copy the precision from the integer
6434 type returned above. If not an INTEGER_TYPE, we can't use
6435 this mode for this type. */
6436 if (TREE_CODE (typefm) != INTEGER_TYPE)
6438 error ("cannot use mode %qs for enumeral types", p);
6442 if (flags & ATTR_FLAG_TYPE_IN_PLACE)
6444 TYPE_PRECISION (type) = TYPE_PRECISION (typefm);
6449 /* We cannot build a type variant, as there's code that assumes
6450 that TYPE_MAIN_VARIANT has the same mode. This includes the
6451 debug generators. Instead, create a subrange type. This
6452 results in all of the enumeral values being emitted only once
6453 in the original, and the subtype gets them by reference. */
6454 if (TYPE_UNSIGNED (type))
6455 typefm = make_unsigned_type (TYPE_PRECISION (typefm));
6457 typefm = make_signed_type (TYPE_PRECISION (typefm));
6458 TREE_TYPE (typefm) = type;
6461 else if (VECTOR_MODE_P (mode)
6462 ? TREE_CODE (type) != TREE_CODE (TREE_TYPE (typefm))
6463 : TREE_CODE (type) != TREE_CODE (typefm))
6465 error ("mode %qs applied to inappropriate type", p);
6475 /* Handle a "section" attribute; arguments as in
6476 struct attribute_spec.handler. */
6479 handle_section_attribute (tree *node, tree ARG_UNUSED (name), tree args,
6480 int ARG_UNUSED (flags), bool *no_add_attrs)
6484 if (targetm.have_named_sections)
6486 user_defined_section_attribute = true;
6488 if ((TREE_CODE (decl) == FUNCTION_DECL
6489 || TREE_CODE (decl) == VAR_DECL)
6490 && TREE_CODE (TREE_VALUE (args)) == STRING_CST)
6492 if (TREE_CODE (decl) == VAR_DECL
6493 && current_function_decl != NULL_TREE
6494 && !TREE_STATIC (decl))
6496 error ("%Jsection attribute cannot be specified for "
6497 "local variables", decl);
6498 *no_add_attrs = true;
6501 /* The decl may have already been given a section attribute
6502 from a previous declaration. Ensure they match. */
6503 else if (DECL_SECTION_NAME (decl) != NULL_TREE
6504 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
6505 TREE_STRING_POINTER (TREE_VALUE (args))) != 0)
6507 error ("section of %q+D conflicts with previous declaration",
6509 *no_add_attrs = true;
6511 else if (TREE_CODE (decl) == VAR_DECL
6512 && !targetm.have_tls && targetm.emutls.tmpl_section
6513 && DECL_THREAD_LOCAL_P (decl))
6515 error ("section of %q+D cannot be overridden", *node);
6516 *no_add_attrs = true;
6519 DECL_SECTION_NAME (decl) = TREE_VALUE (args);
6523 error ("section attribute not allowed for %q+D", *node);
6524 *no_add_attrs = true;
6529 error ("%Jsection attributes are not supported for this target", *node);
6530 *no_add_attrs = true;
6536 /* Handle a "aligned" attribute; arguments as in
6537 struct attribute_spec.handler. */
6540 handle_aligned_attribute (tree *node, tree ARG_UNUSED (name), tree args,
6541 int flags, bool *no_add_attrs)
6543 tree decl = NULL_TREE;
6546 tree align_expr = (args ? TREE_VALUE (args)
6547 : size_int (ATTRIBUTE_ALIGNED_VALUE / BITS_PER_UNIT));
6553 type = &TREE_TYPE (decl);
6554 is_type = TREE_CODE (*node) == TYPE_DECL;
6556 else if (TYPE_P (*node))
6557 type = node, is_type = 1;
6559 if (TREE_CODE (align_expr) != INTEGER_CST)
6561 error ("requested alignment is not a constant");
6562 *no_add_attrs = true;
6564 else if ((i = tree_log2 (align_expr)) == -1)
6566 error ("requested alignment is not a power of 2");
6567 *no_add_attrs = true;
6569 else if (i >= HOST_BITS_PER_INT - BITS_PER_UNIT_LOG)
6571 error ("requested alignment is too large");
6572 *no_add_attrs = true;
6576 /* If we have a TYPE_DECL, then copy the type, so that we
6577 don't accidentally modify a builtin type. See pushdecl. */
6578 if (decl && TREE_TYPE (decl) != error_mark_node
6579 && DECL_ORIGINAL_TYPE (decl) == NULL_TREE)
6581 tree tt = TREE_TYPE (decl);
6582 *type = build_variant_type_copy (*type);
6583 DECL_ORIGINAL_TYPE (decl) = tt;
6584 TYPE_NAME (*type) = decl;
6585 TREE_USED (*type) = TREE_USED (decl);
6586 TREE_TYPE (decl) = *type;
6588 else if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
6589 *type = build_variant_type_copy (*type);
6591 TYPE_ALIGN (*type) = (1U << i) * BITS_PER_UNIT;
6592 TYPE_USER_ALIGN (*type) = 1;
6594 else if (! VAR_OR_FUNCTION_DECL_P (decl)
6595 && TREE_CODE (decl) != FIELD_DECL)
6597 error ("alignment may not be specified for %q+D", decl);
6598 *no_add_attrs = true;
6600 else if (TREE_CODE (decl) == FUNCTION_DECL
6601 && DECL_ALIGN (decl) > (1U << i) * BITS_PER_UNIT)
6603 if (DECL_USER_ALIGN (decl))
6604 error ("alignment for %q+D was previously specified as %d "
6605 "and may not be decreased", decl,
6606 DECL_ALIGN (decl) / BITS_PER_UNIT);
6608 error ("alignment for %q+D must be at least %d", decl,
6609 DECL_ALIGN (decl) / BITS_PER_UNIT);
6610 *no_add_attrs = true;
6614 DECL_ALIGN (decl) = (1U << i) * BITS_PER_UNIT;
6615 DECL_USER_ALIGN (decl) = 1;
6621 /* Handle a "weak" attribute; arguments as in
6622 struct attribute_spec.handler. */
6625 handle_weak_attribute (tree *node, tree name,
6626 tree ARG_UNUSED (args),
6627 int ARG_UNUSED (flags),
6628 bool * ARG_UNUSED (no_add_attrs))
6630 if (TREE_CODE (*node) == FUNCTION_DECL
6631 && DECL_DECLARED_INLINE_P (*node))
6633 error ("inline function %q+D cannot be declared weak", *node);
6634 *no_add_attrs = true;
6636 else if (TREE_CODE (*node) == FUNCTION_DECL
6637 || TREE_CODE (*node) == VAR_DECL)
6638 declare_weak (*node);
6640 warning (OPT_Wattributes, "%qE attribute ignored", name);
6645 /* Handle an "alias" attribute; arguments as in
6646 struct attribute_spec.handler. */
6649 handle_alias_attribute (tree *node, tree name, tree args,
6650 int ARG_UNUSED (flags), bool *no_add_attrs)
6654 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
6656 warning (OPT_Wattributes, "%qE attribute ignored", name);
6657 *no_add_attrs = true;
6659 else if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
6660 || (TREE_CODE (decl) != FUNCTION_DECL
6661 && TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl))
6662 /* A static variable declaration is always a tentative definition,
6663 but the alias is a non-tentative definition which overrides. */
6664 || (TREE_CODE (decl) != FUNCTION_DECL
6665 && ! TREE_PUBLIC (decl) && DECL_INITIAL (decl)))
6667 error ("%q+D defined both normally and as an alias", decl);
6668 *no_add_attrs = true;
6671 /* Note that the very first time we process a nested declaration,
6672 decl_function_context will not be set. Indeed, *would* never
6673 be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that
6674 we do below. After such frobbery, pushdecl would set the context.
6675 In any case, this is never what we want. */
6676 else if (decl_function_context (decl) == 0 && current_function_decl == NULL)
6680 id = TREE_VALUE (args);
6681 if (TREE_CODE (id) != STRING_CST)
6683 error ("alias argument not a string");
6684 *no_add_attrs = true;
6687 id = get_identifier (TREE_STRING_POINTER (id));
6688 /* This counts as a use of the object pointed to. */
6691 if (TREE_CODE (decl) == FUNCTION_DECL)
6692 DECL_INITIAL (decl) = error_mark_node;
6695 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
6696 DECL_EXTERNAL (decl) = 1;
6698 DECL_EXTERNAL (decl) = 0;
6699 TREE_STATIC (decl) = 1;
6704 warning (OPT_Wattributes, "%qE attribute ignored", name);
6705 *no_add_attrs = true;
6711 /* Handle a "weakref" attribute; arguments as in struct
6712 attribute_spec.handler. */
6715 handle_weakref_attribute (tree *node, tree ARG_UNUSED (name), tree args,
6716 int flags, bool *no_add_attrs)
6718 tree attr = NULL_TREE;
6720 /* We must ignore the attribute when it is associated with
6721 local-scoped decls, since attribute alias is ignored and many
6722 such symbols do not even have a DECL_WEAK field. */
6723 if (decl_function_context (*node)
6724 || current_function_decl
6725 || (TREE_CODE (*node) != VAR_DECL && TREE_CODE (*node) != FUNCTION_DECL))
6727 warning (OPT_Wattributes, "%qE attribute ignored", name);
6728 *no_add_attrs = true;
6732 /* The idea here is that `weakref("name")' mutates into `weakref,
6733 alias("name")', and weakref without arguments, in turn,
6734 implicitly adds weak. */
6738 attr = tree_cons (get_identifier ("alias"), args, attr);
6739 attr = tree_cons (get_identifier ("weakref"), NULL_TREE, attr);
6741 *no_add_attrs = true;
6743 decl_attributes (node, attr, flags);
6747 if (lookup_attribute ("alias", DECL_ATTRIBUTES (*node)))
6748 error ("%Jweakref attribute must appear before alias attribute",
6751 /* Can't call declare_weak because it wants this to be TREE_PUBLIC,
6752 and that isn't supported; and because it wants to add it to
6753 the list of weak decls, which isn't helpful. */
6754 DECL_WEAK (*node) = 1;
6760 /* Handle an "visibility" attribute; arguments as in
6761 struct attribute_spec.handler. */
6764 handle_visibility_attribute (tree *node, tree name, tree args,
6765 int ARG_UNUSED (flags),
6766 bool *ARG_UNUSED (no_add_attrs))
6769 tree id = TREE_VALUE (args);
6770 enum symbol_visibility vis;
6774 if (TREE_CODE (*node) == ENUMERAL_TYPE)
6776 else if (TREE_CODE (*node) != RECORD_TYPE && TREE_CODE (*node) != UNION_TYPE)
6778 warning (OPT_Wattributes, "%qE attribute ignored on non-class types",
6782 else if (TYPE_FIELDS (*node))
6784 error ("%qE attribute ignored because %qT is already defined",
6789 else if (decl_function_context (decl) != 0 || !TREE_PUBLIC (decl))
6791 warning (OPT_Wattributes, "%qE attribute ignored", name);
6795 if (TREE_CODE (id) != STRING_CST)
6797 error ("visibility argument not a string");
6801 /* If this is a type, set the visibility on the type decl. */
6804 decl = TYPE_NAME (decl);
6807 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6809 warning (OPT_Wattributes, "%qE attribute ignored on types",
6815 if (strcmp (TREE_STRING_POINTER (id), "default") == 0)
6816 vis = VISIBILITY_DEFAULT;
6817 else if (strcmp (TREE_STRING_POINTER (id), "internal") == 0)
6818 vis = VISIBILITY_INTERNAL;
6819 else if (strcmp (TREE_STRING_POINTER (id), "hidden") == 0)
6820 vis = VISIBILITY_HIDDEN;
6821 else if (strcmp (TREE_STRING_POINTER (id), "protected") == 0)
6822 vis = VISIBILITY_PROTECTED;
6825 error ("visibility argument must be one of \"default\", \"hidden\", \"protected\" or \"internal\"");
6826 vis = VISIBILITY_DEFAULT;
6829 if (DECL_VISIBILITY_SPECIFIED (decl)
6830 && vis != DECL_VISIBILITY (decl))
6832 tree attributes = (TYPE_P (*node)
6833 ? TYPE_ATTRIBUTES (*node)
6834 : DECL_ATTRIBUTES (decl));
6835 if (lookup_attribute ("visibility", attributes))
6836 error ("%qD redeclared with different visibility", decl);
6837 else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
6838 && lookup_attribute ("dllimport", attributes))
6839 error ("%qD was declared %qs which implies default visibility",
6841 else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
6842 && lookup_attribute ("dllexport", attributes))
6843 error ("%qD was declared %qs which implies default visibility",
6847 DECL_VISIBILITY (decl) = vis;
6848 DECL_VISIBILITY_SPECIFIED (decl) = 1;
6850 /* Go ahead and attach the attribute to the node as well. This is needed
6851 so we can determine whether we have VISIBILITY_DEFAULT because the
6852 visibility was not specified, or because it was explicitly overridden
6853 from the containing scope. */
6858 /* Determine the ELF symbol visibility for DECL, which is either a
6859 variable or a function. It is an error to use this function if a
6860 definition of DECL is not available in this translation unit.
6861 Returns true if the final visibility has been determined by this
6862 function; false if the caller is free to make additional
6866 c_determine_visibility (tree decl)
6868 gcc_assert (TREE_CODE (decl) == VAR_DECL
6869 || TREE_CODE (decl) == FUNCTION_DECL);
6871 /* If the user explicitly specified the visibility with an
6872 attribute, honor that. DECL_VISIBILITY will have been set during
6873 the processing of the attribute. We check for an explicit
6874 attribute, rather than just checking DECL_VISIBILITY_SPECIFIED,
6875 to distinguish the use of an attribute from the use of a "#pragma
6876 GCC visibility push(...)"; in the latter case we still want other
6877 considerations to be able to overrule the #pragma. */
6878 if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl))
6879 || (TARGET_DLLIMPORT_DECL_ATTRIBUTES
6880 && (lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl))
6881 || lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))))
6884 /* Set default visibility to whatever the user supplied with
6885 visibility_specified depending on #pragma GCC visibility. */
6886 if (!DECL_VISIBILITY_SPECIFIED (decl))
6888 if (visibility_options.inpragma
6889 || DECL_VISIBILITY (decl) != default_visibility)
6891 DECL_VISIBILITY (decl) = default_visibility;
6892 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
6893 /* If visibility changed and DECL already has DECL_RTL, ensure
6894 symbol flags are updated. */
6895 if (((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
6896 || TREE_CODE (decl) == FUNCTION_DECL)
6897 && DECL_RTL_SET_P (decl))
6898 make_decl_rtl (decl);
6904 /* Handle an "tls_model" attribute; arguments as in
6905 struct attribute_spec.handler. */
6908 handle_tls_model_attribute (tree *node, tree name, tree args,
6909 int ARG_UNUSED (flags), bool *no_add_attrs)
6913 enum tls_model kind;
6915 *no_add_attrs = true;
6917 if (TREE_CODE (decl) != VAR_DECL || !DECL_THREAD_LOCAL_P (decl))
6919 warning (OPT_Wattributes, "%qE attribute ignored", name);
6923 kind = DECL_TLS_MODEL (decl);
6924 id = TREE_VALUE (args);
6925 if (TREE_CODE (id) != STRING_CST)
6927 error ("tls_model argument not a string");
6931 if (!strcmp (TREE_STRING_POINTER (id), "local-exec"))
6932 kind = TLS_MODEL_LOCAL_EXEC;
6933 else if (!strcmp (TREE_STRING_POINTER (id), "initial-exec"))
6934 kind = TLS_MODEL_INITIAL_EXEC;
6935 else if (!strcmp (TREE_STRING_POINTER (id), "local-dynamic"))
6936 kind = optimize ? TLS_MODEL_LOCAL_DYNAMIC : TLS_MODEL_GLOBAL_DYNAMIC;
6937 else if (!strcmp (TREE_STRING_POINTER (id), "global-dynamic"))
6938 kind = TLS_MODEL_GLOBAL_DYNAMIC;
6940 error ("tls_model argument must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\"");
6942 DECL_TLS_MODEL (decl) = kind;
6946 /* Handle a "no_instrument_function" attribute; arguments as in
6947 struct attribute_spec.handler. */
6950 handle_no_instrument_function_attribute (tree *node, tree name,
6951 tree ARG_UNUSED (args),
6952 int ARG_UNUSED (flags),
6957 if (TREE_CODE (decl) != FUNCTION_DECL)
6959 error ("%J%qE attribute applies only to functions", decl, name);
6960 *no_add_attrs = true;
6962 else if (DECL_INITIAL (decl))
6964 error ("%Jcan%'t set %qE attribute after definition", decl, name);
6965 *no_add_attrs = true;
6968 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1;
6973 /* Handle a "malloc" attribute; arguments as in
6974 struct attribute_spec.handler. */
6977 handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args),
6978 int ARG_UNUSED (flags), bool *no_add_attrs)
6980 if (TREE_CODE (*node) == FUNCTION_DECL
6981 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node))))
6982 DECL_IS_MALLOC (*node) = 1;
6985 warning (OPT_Wattributes, "%qE attribute ignored", name);
6986 *no_add_attrs = true;
6992 /* Handle a "alloc_size" attribute; arguments as in
6993 struct attribute_spec.handler. */
6996 handle_alloc_size_attribute (tree *node, tree ARG_UNUSED (name), tree args,
6997 int ARG_UNUSED (flags), bool *no_add_attrs)
6999 unsigned arg_count = type_num_arguments (*node);
7000 for (; args; args = TREE_CHAIN (args))
7002 tree position = TREE_VALUE (args);
7004 if (TREE_CODE (position) != INTEGER_CST
7005 || TREE_INT_CST_HIGH (position)
7006 || TREE_INT_CST_LOW (position) < 1
7007 || TREE_INT_CST_LOW (position) > arg_count )
7009 warning (OPT_Wattributes,
7010 "alloc_size parameter outside range");
7011 *no_add_attrs = true;
7018 /* Handle a "returns_twice" attribute; arguments as in
7019 struct attribute_spec.handler. */
7022 handle_returns_twice_attribute (tree *node, tree name, tree ARG_UNUSED (args),
7023 int ARG_UNUSED (flags), bool *no_add_attrs)
7025 if (TREE_CODE (*node) == FUNCTION_DECL)
7026 DECL_IS_RETURNS_TWICE (*node) = 1;
7029 warning (OPT_Wattributes, "%qE attribute ignored", name);
7030 *no_add_attrs = true;
7036 /* Handle a "no_limit_stack" attribute; arguments as in
7037 struct attribute_spec.handler. */
7040 handle_no_limit_stack_attribute (tree *node, tree name,
7041 tree ARG_UNUSED (args),
7042 int ARG_UNUSED (flags),
7047 if (TREE_CODE (decl) != FUNCTION_DECL)
7049 error ("%J%qE attribute applies only to functions", decl, name);
7050 *no_add_attrs = true;
7052 else if (DECL_INITIAL (decl))
7054 error ("%Jcan%'t set %qE attribute after definition", decl, name);
7055 *no_add_attrs = true;
7058 DECL_NO_LIMIT_STACK (decl) = 1;
7063 /* Handle a "pure" attribute; arguments as in
7064 struct attribute_spec.handler. */
7067 handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args),
7068 int ARG_UNUSED (flags), bool *no_add_attrs)
7070 if (TREE_CODE (*node) == FUNCTION_DECL)
7071 DECL_PURE_P (*node) = 1;
7072 /* ??? TODO: Support types. */
7075 warning (OPT_Wattributes, "%qE attribute ignored", name);
7076 *no_add_attrs = true;
7082 /* Handle a "no vops" attribute; arguments as in
7083 struct attribute_spec.handler. */
7086 handle_novops_attribute (tree *node, tree ARG_UNUSED (name),
7087 tree ARG_UNUSED (args), int ARG_UNUSED (flags),
7088 bool *ARG_UNUSED (no_add_attrs))
7090 gcc_assert (TREE_CODE (*node) == FUNCTION_DECL);
7091 DECL_IS_NOVOPS (*node) = 1;
7095 /* Handle a "deprecated" attribute; arguments as in
7096 struct attribute_spec.handler. */
7099 handle_deprecated_attribute (tree *node, tree name,
7100 tree args, int flags,
7103 tree type = NULL_TREE;
7105 tree what = NULL_TREE;
7108 *no_add_attrs = true;
7109 else if (TREE_CODE (TREE_VALUE (args)) != STRING_CST)
7111 error ("deprecated message is not a string");
7112 *no_add_attrs = true;
7118 type = TREE_TYPE (decl);
7120 if (TREE_CODE (decl) == TYPE_DECL
7121 || TREE_CODE (decl) == PARM_DECL
7122 || TREE_CODE (decl) == VAR_DECL
7123 || TREE_CODE (decl) == FUNCTION_DECL
7124 || TREE_CODE (decl) == FIELD_DECL)
7125 TREE_DEPRECATED (decl) = 1;
7129 else if (TYPE_P (*node))
7131 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
7132 *node = build_variant_type_copy (*node);
7133 TREE_DEPRECATED (*node) = 1;
7141 *no_add_attrs = true;
7142 if (type && TYPE_NAME (type))
7144 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
7145 what = TYPE_NAME (*node);
7146 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
7147 && DECL_NAME (TYPE_NAME (type)))
7148 what = DECL_NAME (TYPE_NAME (type));
7151 warning (OPT_Wattributes, "%qE attribute ignored for %qE", name, what);
7153 warning (OPT_Wattributes, "%qE attribute ignored", name);
7159 /* Handle a "vector_size" attribute; arguments as in
7160 struct attribute_spec.handler. */
7163 handle_vector_size_attribute (tree *node, tree name, tree args,
7164 int ARG_UNUSED (flags),
7167 unsigned HOST_WIDE_INT vecsize, nunits;
7168 enum machine_mode orig_mode;
7169 tree type = *node, new_type, size;
7171 *no_add_attrs = true;
7173 size = TREE_VALUE (args);
7175 if (!host_integerp (size, 1))
7177 warning (OPT_Wattributes, "%qE attribute ignored", name);
7181 /* Get the vector size (in bytes). */
7182 vecsize = tree_low_cst (size, 1);
7184 /* We need to provide for vector pointers, vector arrays, and
7185 functions returning vectors. For example:
7187 __attribute__((vector_size(16))) short *foo;
7189 In this case, the mode is SI, but the type being modified is
7190 HI, so we need to look further. */
7192 while (POINTER_TYPE_P (type)
7193 || TREE_CODE (type) == FUNCTION_TYPE
7194 || TREE_CODE (type) == METHOD_TYPE
7195 || TREE_CODE (type) == ARRAY_TYPE
7196 || TREE_CODE (type) == OFFSET_TYPE)
7197 type = TREE_TYPE (type);
7199 /* Get the mode of the type being modified. */
7200 orig_mode = TYPE_MODE (type);
7202 if ((!INTEGRAL_TYPE_P (type)
7203 && !SCALAR_FLOAT_TYPE_P (type)
7204 && !FIXED_POINT_TYPE_P (type))
7205 || (!SCALAR_FLOAT_MODE_P (orig_mode)
7206 && GET_MODE_CLASS (orig_mode) != MODE_INT
7207 && !ALL_SCALAR_FIXED_POINT_MODE_P (orig_mode))
7208 || !host_integerp (TYPE_SIZE_UNIT (type), 1)
7209 || TREE_CODE (type) == BOOLEAN_TYPE)
7211 error ("invalid vector type for attribute %qE", name);
7215 if (vecsize % tree_low_cst (TYPE_SIZE_UNIT (type), 1))
7217 error ("vector size not an integral multiple of component size");
7223 error ("zero vector size");
7227 /* Calculate how many units fit in the vector. */
7228 nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1);
7229 if (nunits & (nunits - 1))
7231 error ("number of components of the vector not a power of two");
7235 new_type = build_vector_type (type, nunits);
7237 /* Build back pointers if needed. */
7238 *node = lang_hooks.types.reconstruct_complex_type (*node, new_type);
7243 /* Handle the "nonnull" attribute. */
7245 handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name),
7246 tree args, int ARG_UNUSED (flags),
7250 unsigned HOST_WIDE_INT attr_arg_num;
7252 /* If no arguments are specified, all pointer arguments should be
7253 non-null. Verify a full prototype is given so that the arguments
7254 will have the correct types when we actually check them later. */
7257 if (!TYPE_ARG_TYPES (type))
7259 error ("nonnull attribute without arguments on a non-prototype");
7260 *no_add_attrs = true;
7265 /* Argument list specified. Verify that each argument number references
7266 a pointer argument. */
7267 for (attr_arg_num = 1; args; args = TREE_CHAIN (args))
7270 unsigned HOST_WIDE_INT arg_num = 0, ck_num;
7272 if (!get_nonnull_operand (TREE_VALUE (args), &arg_num))
7274 error ("nonnull argument has invalid operand number (argument %lu)",
7275 (unsigned long) attr_arg_num);
7276 *no_add_attrs = true;
7280 argument = TYPE_ARG_TYPES (type);
7283 for (ck_num = 1; ; ck_num++)
7285 if (!argument || ck_num == arg_num)
7287 argument = TREE_CHAIN (argument);
7291 || TREE_CODE (TREE_VALUE (argument)) == VOID_TYPE)
7293 error ("nonnull argument with out-of-range operand number (argument %lu, operand %lu)",
7294 (unsigned long) attr_arg_num, (unsigned long) arg_num);
7295 *no_add_attrs = true;
7299 if (TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE)
7301 error ("nonnull argument references non-pointer operand (argument %lu, operand %lu)",
7302 (unsigned long) attr_arg_num, (unsigned long) arg_num);
7303 *no_add_attrs = true;
7312 /* Check the argument list of a function call for null in argument slots
7313 that are marked as requiring a non-null pointer argument. The NARGS
7314 arguments are passed in the array ARGARRAY.
7318 check_function_nonnull (tree attrs, int nargs, tree *argarray)
7323 for (a = attrs; a; a = TREE_CHAIN (a))
7325 if (is_attribute_p ("nonnull", TREE_PURPOSE (a)))
7327 args = TREE_VALUE (a);
7329 /* Walk the argument list. If we encounter an argument number we
7330 should check for non-null, do it. If the attribute has no args,
7331 then every pointer argument is checked (in which case the check
7332 for pointer type is done in check_nonnull_arg). */
7333 for (i = 0; i < nargs; i++)
7335 if (!args || nonnull_check_p (args, i + 1))
7336 check_function_arguments_recurse (check_nonnull_arg, NULL,
7344 /* Check that the Nth argument of a function call (counting backwards
7345 from the end) is a (pointer)0. The NARGS arguments are passed in the
7349 check_function_sentinel (tree attrs, int nargs, tree *argarray, tree typelist)
7351 tree attr = lookup_attribute ("sentinel", attrs);
7359 /* Skip over the named arguments. */
7360 while (typelist && len < nargs)
7362 typelist = TREE_CHAIN (typelist);
7366 if (TREE_VALUE (attr))
7368 tree p = TREE_VALUE (TREE_VALUE (attr));
7369 pos = TREE_INT_CST_LOW (p);
7372 /* The sentinel must be one of the varargs, i.e.
7373 in position >= the number of fixed arguments. */
7374 if ((nargs - 1 - pos) < len)
7376 warning (OPT_Wformat,
7377 "not enough variable arguments to fit a sentinel");
7381 /* Validate the sentinel. */
7382 sentinel = argarray[nargs - 1 - pos];
7383 if ((!POINTER_TYPE_P (TREE_TYPE (sentinel))
7384 || !integer_zerop (sentinel))
7385 /* Although __null (in C++) is only an integer we allow it
7386 nevertheless, as we are guaranteed that it's exactly
7387 as wide as a pointer, and we don't want to force
7388 users to cast the NULL they have written there.
7389 We warn with -Wstrict-null-sentinel, though. */
7390 && (warn_strict_null_sentinel || null_node != sentinel))
7391 warning (OPT_Wformat, "missing sentinel in function call");
7395 /* Helper for check_function_nonnull; given a list of operands which
7396 must be non-null in ARGS, determine if operand PARAM_NUM should be
7400 nonnull_check_p (tree args, unsigned HOST_WIDE_INT param_num)
7402 unsigned HOST_WIDE_INT arg_num = 0;
7404 for (; args; args = TREE_CHAIN (args))
7406 bool found = get_nonnull_operand (TREE_VALUE (args), &arg_num);
7410 if (arg_num == param_num)
7416 /* Check that the function argument PARAM (which is operand number
7417 PARAM_NUM) is non-null. This is called by check_function_nonnull
7418 via check_function_arguments_recurse. */
7421 check_nonnull_arg (void * ARG_UNUSED (ctx), tree param,
7422 unsigned HOST_WIDE_INT param_num)
7424 /* Just skip checking the argument if it's not a pointer. This can
7425 happen if the "nonnull" attribute was given without an operand
7426 list (which means to check every pointer argument). */
7428 if (TREE_CODE (TREE_TYPE (param)) != POINTER_TYPE)
7431 if (integer_zerop (param))
7432 warning (OPT_Wnonnull, "null argument where non-null required "
7433 "(argument %lu)", (unsigned long) param_num);
7436 /* Helper for nonnull attribute handling; fetch the operand number
7437 from the attribute argument list. */
7440 get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp)
7442 /* Verify the arg number is a constant. */
7443 if (TREE_CODE (arg_num_expr) != INTEGER_CST
7444 || TREE_INT_CST_HIGH (arg_num_expr) != 0)
7447 *valp = TREE_INT_CST_LOW (arg_num_expr);
7451 /* Handle a "nothrow" attribute; arguments as in
7452 struct attribute_spec.handler. */
7455 handle_nothrow_attribute (tree *node, tree name, tree ARG_UNUSED (args),
7456 int ARG_UNUSED (flags), bool *no_add_attrs)
7458 if (TREE_CODE (*node) == FUNCTION_DECL)
7459 TREE_NOTHROW (*node) = 1;
7460 /* ??? TODO: Support types. */
7463 warning (OPT_Wattributes, "%qE attribute ignored", name);
7464 *no_add_attrs = true;
7470 /* Handle a "cleanup" attribute; arguments as in
7471 struct attribute_spec.handler. */
7474 handle_cleanup_attribute (tree *node, tree name, tree args,
7475 int ARG_UNUSED (flags), bool *no_add_attrs)
7478 tree cleanup_id, cleanup_decl;
7480 /* ??? Could perhaps support cleanups on TREE_STATIC, much like we do
7481 for global destructors in C++. This requires infrastructure that
7482 we don't have generically at the moment. It's also not a feature
7483 we'd be missing too much, since we do have attribute constructor. */
7484 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl))
7486 warning (OPT_Wattributes, "%qE attribute ignored", name);
7487 *no_add_attrs = true;
7491 /* Verify that the argument is a function in scope. */
7492 /* ??? We could support pointers to functions here as well, if
7493 that was considered desirable. */
7494 cleanup_id = TREE_VALUE (args);
7495 if (TREE_CODE (cleanup_id) != IDENTIFIER_NODE)
7497 error ("cleanup argument not an identifier");
7498 *no_add_attrs = true;
7501 cleanup_decl = lookup_name (cleanup_id);
7502 if (!cleanup_decl || TREE_CODE (cleanup_decl) != FUNCTION_DECL)
7504 error ("cleanup argument not a function");
7505 *no_add_attrs = true;
7509 /* That the function has proper type is checked with the
7510 eventual call to build_function_call. */
7515 /* Handle a "warn_unused_result" attribute. No special handling. */
7518 handle_warn_unused_result_attribute (tree *node, tree name,
7519 tree ARG_UNUSED (args),
7520 int ARG_UNUSED (flags), bool *no_add_attrs)
7522 /* Ignore the attribute for functions not returning any value. */
7523 if (VOID_TYPE_P (TREE_TYPE (*node)))
7525 warning (OPT_Wattributes, "%qE attribute ignored", name);
7526 *no_add_attrs = true;
7532 /* Handle a "sentinel" attribute. */
7535 handle_sentinel_attribute (tree *node, tree name, tree args,
7536 int ARG_UNUSED (flags), bool *no_add_attrs)
7538 tree params = TYPE_ARG_TYPES (*node);
7542 warning (OPT_Wattributes,
7543 "%qE attribute requires prototypes with named arguments", name);
7544 *no_add_attrs = true;
7548 while (TREE_CHAIN (params))
7549 params = TREE_CHAIN (params);
7551 if (VOID_TYPE_P (TREE_VALUE (params)))
7553 warning (OPT_Wattributes,
7554 "%qE attribute only applies to variadic functions", name);
7555 *no_add_attrs = true;
7561 tree position = TREE_VALUE (args);
7563 if (TREE_CODE (position) != INTEGER_CST)
7565 warning (OPT_Wattributes,
7566 "requested position is not an integer constant");
7567 *no_add_attrs = true;
7571 if (tree_int_cst_lt (position, integer_zero_node))
7573 warning (OPT_Wattributes,
7574 "requested position is less than zero");
7575 *no_add_attrs = true;
7583 /* Handle a "type_generic" attribute. */
7586 handle_type_generic_attribute (tree *node, tree ARG_UNUSED (name),
7587 tree ARG_UNUSED (args), int ARG_UNUSED (flags),
7588 bool * ARG_UNUSED (no_add_attrs))
7592 /* Ensure we have a function type. */
7593 gcc_assert (TREE_CODE (*node) == FUNCTION_TYPE);
7595 params = TYPE_ARG_TYPES (*node);
7596 while (params && ! VOID_TYPE_P (TREE_VALUE (params)))
7597 params = TREE_CHAIN (params);
7599 /* Ensure we have a variadic function. */
7600 gcc_assert (!params);
7605 /* Handle a "target" attribute. */
7608 handle_target_attribute (tree *node, tree name, tree args, int flags,
7611 /* Ensure we have a function type. */
7612 if (TREE_CODE (*node) != FUNCTION_DECL)
7614 warning (OPT_Wattributes, "%qE attribute ignored", name);
7615 *no_add_attrs = true;
7617 else if (! targetm.target_option.valid_attribute_p (*node, name, args,
7619 *no_add_attrs = true;
7624 /* Arguments being collected for optimization. */
7625 typedef const char *const_char_p; /* For DEF_VEC_P. */
7626 DEF_VEC_P(const_char_p);
7627 DEF_VEC_ALLOC_P(const_char_p, gc);
7628 static GTY(()) VEC(const_char_p, gc) *optimize_args;
7631 /* Inner function to convert a TREE_LIST to argv string to parse the optimize
7632 options in ARGS. ATTR_P is true if this is for attribute(optimize), and
7633 false for #pragma GCC optimize. */
7636 parse_optimize_options (tree args, bool attr_p)
7641 int saved_flag_strict_aliasing;
7642 const char **opt_argv;
7645 /* Build up argv vector. Just in case the string is stored away, use garbage
7646 collected strings. */
7647 VEC_truncate (const_char_p, optimize_args, 0);
7648 VEC_safe_push (const_char_p, gc, optimize_args, NULL);
7650 for (ap = args; ap != NULL_TREE; ap = TREE_CHAIN (ap))
7652 tree value = TREE_VALUE (ap);
7654 if (TREE_CODE (value) == INTEGER_CST)
7657 sprintf (buffer, "-O%ld", (long) TREE_INT_CST_LOW (value));
7658 VEC_safe_push (const_char_p, gc, optimize_args, ggc_strdup (buffer));
7661 else if (TREE_CODE (value) == STRING_CST)
7663 /* Split string into multiple substrings. */
7664 size_t len = TREE_STRING_LENGTH (value);
7665 char *p = ASTRDUP (TREE_STRING_POINTER (value));
7666 char *end = p + len;
7670 while (next_p != NULL)
7676 comma = strchr (p, ',');
7689 r = q = (char *) ggc_alloc (len2 + 3);
7691 /* If the user supplied -Oxxx or -fxxx, only allow -Oxxx or -fxxx
7693 if (*p == '-' && p[1] != 'O' && p[1] != 'f')
7697 warning (OPT_Wattributes,
7698 "Bad option %s to optimize attribute.", p);
7700 warning (OPT_Wpragmas,
7701 "Bad option %s to pragma attribute", p);
7709 /* Assume that Ox is -Ox, a numeric value is -Ox, a s by
7710 itself is -Os, and any other switch begins with a -f. */
7711 if ((*p >= '0' && *p <= '9')
7712 || (p[0] == 's' && p[1] == '\0'))
7718 memcpy (r, p, len2);
7720 VEC_safe_push (const_char_p, gc, optimize_args, q);
7726 opt_argc = VEC_length (const_char_p, optimize_args);
7727 opt_argv = (const char **) alloca (sizeof (char *) * (opt_argc + 1));
7729 for (i = 1; i < opt_argc; i++)
7730 opt_argv[i] = VEC_index (const_char_p, optimize_args, i);
7732 saved_flag_strict_aliasing = flag_strict_aliasing;
7734 /* Now parse the options. */
7735 decode_options (opt_argc, opt_argv);
7737 /* Don't allow changing -fstrict-aliasing. */
7738 flag_strict_aliasing = saved_flag_strict_aliasing;
7740 VEC_truncate (const_char_p, optimize_args, 0);
7744 /* For handling "optimize" attribute. arguments as in
7745 struct attribute_spec.handler. */
7748 handle_optimize_attribute (tree *node, tree name, tree args,
7749 int ARG_UNUSED (flags), bool *no_add_attrs)
7751 /* Ensure we have a function type. */
7752 if (TREE_CODE (*node) != FUNCTION_DECL)
7754 warning (OPT_Wattributes, "%qE attribute ignored", name);
7755 *no_add_attrs = true;
7759 struct cl_optimization cur_opts;
7760 tree old_opts = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node);
7762 /* Save current options. */
7763 cl_optimization_save (&cur_opts);
7765 /* If we previously had some optimization options, use them as the
7768 cl_optimization_restore (TREE_OPTIMIZATION (old_opts));
7770 /* Parse options, and update the vector. */
7771 parse_optimize_options (args, true);
7772 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node)
7773 = build_optimization_node ();
7775 /* Restore current options. */
7776 cl_optimization_restore (&cur_opts);
7782 /* Check for valid arguments being passed to a function.
7783 ATTRS is a list of attributes. There are NARGS arguments in the array
7784 ARGARRAY. TYPELIST is the list of argument types for the function.
7787 check_function_arguments (tree attrs, int nargs, tree *argarray, tree typelist)
7789 /* Check for null being passed in a pointer argument that must be
7790 non-null. We also need to do this if format checking is enabled. */
7793 check_function_nonnull (attrs, nargs, argarray);
7795 /* Check for errors in format strings. */
7797 if (warn_format || warn_missing_format_attribute)
7798 check_function_format (attrs, nargs, argarray);
7801 check_function_sentinel (attrs, nargs, argarray, typelist);
7804 /* Generic argument checking recursion routine. PARAM is the argument to
7805 be checked. PARAM_NUM is the number of the argument. CALLBACK is invoked
7806 once the argument is resolved. CTX is context for the callback. */
7808 check_function_arguments_recurse (void (*callback)
7809 (void *, tree, unsigned HOST_WIDE_INT),
7810 void *ctx, tree param,
7811 unsigned HOST_WIDE_INT param_num)
7813 if (CONVERT_EXPR_P (param)
7814 && (TYPE_PRECISION (TREE_TYPE (param))
7815 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (param, 0)))))
7817 /* Strip coercion. */
7818 check_function_arguments_recurse (callback, ctx,
7819 TREE_OPERAND (param, 0), param_num);
7823 if (TREE_CODE (param) == CALL_EXPR)
7825 tree type = TREE_TYPE (TREE_TYPE (CALL_EXPR_FN (param)));
7827 bool found_format_arg = false;
7829 /* See if this is a call to a known internationalization function
7830 that modifies a format arg. Such a function may have multiple
7831 format_arg attributes (for example, ngettext). */
7833 for (attrs = TYPE_ATTRIBUTES (type);
7835 attrs = TREE_CHAIN (attrs))
7836 if (is_attribute_p ("format_arg", TREE_PURPOSE (attrs)))
7839 tree format_num_expr;
7842 call_expr_arg_iterator iter;
7844 /* Extract the argument number, which was previously checked
7846 format_num_expr = TREE_VALUE (TREE_VALUE (attrs));
7848 gcc_assert (TREE_CODE (format_num_expr) == INTEGER_CST
7849 && !TREE_INT_CST_HIGH (format_num_expr));
7851 format_num = TREE_INT_CST_LOW (format_num_expr);
7853 for (inner_arg = first_call_expr_arg (param, &iter), i = 1;
7855 inner_arg = next_call_expr_arg (&iter), i++)
7856 if (i == format_num)
7858 check_function_arguments_recurse (callback, ctx,
7859 inner_arg, param_num);
7860 found_format_arg = true;
7865 /* If we found a format_arg attribute and did a recursive check,
7866 we are done with checking this argument. Otherwise, we continue
7867 and this will be considered a non-literal. */
7868 if (found_format_arg)
7872 if (TREE_CODE (param) == COND_EXPR)
7874 /* Check both halves of the conditional expression. */
7875 check_function_arguments_recurse (callback, ctx,
7876 TREE_OPERAND (param, 1), param_num);
7877 check_function_arguments_recurse (callback, ctx,
7878 TREE_OPERAND (param, 2), param_num);
7882 (*callback) (ctx, param, param_num);
7885 /* Checks the number of arguments NARGS against the required number
7886 REQUIRED and issues an error if there is a mismatch. Returns true
7887 if the number of arguments is correct, otherwise false. */
7890 validate_nargs (tree fndecl, int nargs, int required)
7892 if (nargs < required)
7894 error ("not enough arguments to function %qE", fndecl);
7897 else if (nargs > required)
7899 error ("too many arguments to function %qE", fndecl);
7905 /* Verifies the NARGS arguments ARGS to the builtin function FNDECL.
7906 Returns false if there was an error, otherwise true. */
7909 check_builtin_function_arguments (tree fndecl, int nargs, tree *args)
7911 if (!DECL_BUILT_IN (fndecl)
7912 || DECL_BUILT_IN_CLASS (fndecl) != BUILT_IN_NORMAL)
7915 switch (DECL_FUNCTION_CODE (fndecl))
7917 case BUILT_IN_CONSTANT_P:
7918 return validate_nargs (fndecl, nargs, 1);
7920 case BUILT_IN_ISFINITE:
7921 case BUILT_IN_ISINF:
7922 case BUILT_IN_ISINF_SIGN:
7923 case BUILT_IN_ISNAN:
7924 case BUILT_IN_ISNORMAL:
7925 if (validate_nargs (fndecl, nargs, 1))
7927 if (TREE_CODE (TREE_TYPE (args[0])) != REAL_TYPE)
7929 error ("non-floating-point argument in call to "
7930 "function %qE", fndecl);
7937 case BUILT_IN_ISGREATER:
7938 case BUILT_IN_ISGREATEREQUAL:
7939 case BUILT_IN_ISLESS:
7940 case BUILT_IN_ISLESSEQUAL:
7941 case BUILT_IN_ISLESSGREATER:
7942 case BUILT_IN_ISUNORDERED:
7943 if (validate_nargs (fndecl, nargs, 2))
7945 enum tree_code code0, code1;
7946 code0 = TREE_CODE (TREE_TYPE (args[0]));
7947 code1 = TREE_CODE (TREE_TYPE (args[1]));
7948 if (!((code0 == REAL_TYPE && code1 == REAL_TYPE)
7949 || (code0 == REAL_TYPE && code1 == INTEGER_TYPE)
7950 || (code0 == INTEGER_TYPE && code1 == REAL_TYPE)))
7952 error ("non-floating-point arguments in call to "
7953 "function %qE", fndecl);
7960 case BUILT_IN_FPCLASSIFY:
7961 if (validate_nargs (fndecl, nargs, 6))
7966 if (TREE_CODE (args[i]) != INTEGER_CST)
7968 error ("non-const integer argument %u in call to function %qE",
7973 if (TREE_CODE (TREE_TYPE (args[5])) != REAL_TYPE)
7975 error ("non-floating-point argument in call to function %qE",
7988 /* Function to help qsort sort FIELD_DECLs by name order. */
7991 field_decl_cmp (const void *x_p, const void *y_p)
7993 const tree *const x = (const tree *const) x_p;
7994 const tree *const y = (const tree *const) y_p;
7996 if (DECL_NAME (*x) == DECL_NAME (*y))
7997 /* A nontype is "greater" than a type. */
7998 return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL);
7999 if (DECL_NAME (*x) == NULL_TREE)
8001 if (DECL_NAME (*y) == NULL_TREE)
8003 if (DECL_NAME (*x) < DECL_NAME (*y))
8009 gt_pointer_operator new_value;
8013 /* This routine compares two fields like field_decl_cmp but using the
8014 pointer operator in resort_data. */
8017 resort_field_decl_cmp (const void *x_p, const void *y_p)
8019 const tree *const x = (const tree *const) x_p;
8020 const tree *const y = (const tree *const) y_p;
8022 if (DECL_NAME (*x) == DECL_NAME (*y))
8023 /* A nontype is "greater" than a type. */
8024 return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL);
8025 if (DECL_NAME (*x) == NULL_TREE)
8027 if (DECL_NAME (*y) == NULL_TREE)
8030 tree d1 = DECL_NAME (*x);
8031 tree d2 = DECL_NAME (*y);
8032 resort_data.new_value (&d1, resort_data.cookie);
8033 resort_data.new_value (&d2, resort_data.cookie);
8040 /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */
8043 resort_sorted_fields (void *obj,
8044 void * ARG_UNUSED (orig_obj),
8045 gt_pointer_operator new_value,
8048 struct sorted_fields_type *sf = (struct sorted_fields_type *) obj;
8049 resort_data.new_value = new_value;
8050 resort_data.cookie = cookie;
8051 qsort (&sf->elts[0], sf->len, sizeof (tree),
8052 resort_field_decl_cmp);
8055 /* Subroutine of c_parse_error.
8056 Return the result of concatenating LHS and RHS. RHS is really
8057 a string literal, its first character is indicated by RHS_START and
8058 RHS_SIZE is its length (including the terminating NUL character).
8060 The caller is responsible for deleting the returned pointer. */
8063 catenate_strings (const char *lhs, const char *rhs_start, int rhs_size)
8065 const int lhs_size = strlen (lhs);
8066 char *result = XNEWVEC (char, lhs_size + rhs_size);
8067 strncpy (result, lhs, lhs_size);
8068 strncpy (result + lhs_size, rhs_start, rhs_size);
8072 /* Issue the error given by GMSGID, indicating that it occurred before
8073 TOKEN, which had the associated VALUE. */
8076 c_parse_error (const char *gmsgid, enum cpp_ttype token_type,
8077 tree value, unsigned char token_flags)
8079 #define catenate_messages(M1, M2) catenate_strings ((M1), (M2), sizeof (M2))
8081 char *message = NULL;
8083 if (token_type == CPP_EOF)
8084 message = catenate_messages (gmsgid, " at end of input");
8085 else if (token_type == CPP_CHAR
8086 || token_type == CPP_WCHAR
8087 || token_type == CPP_CHAR16
8088 || token_type == CPP_CHAR32)
8090 unsigned int val = TREE_INT_CST_LOW (value);
8109 if (val <= UCHAR_MAX && ISGRAPH (val))
8110 message = catenate_messages (gmsgid, " before %s'%c'");
8112 message = catenate_messages (gmsgid, " before %s'\\x%x'");
8114 error (message, prefix, val);
8118 else if (token_type == CPP_STRING
8119 || token_type == CPP_WSTRING
8120 || token_type == CPP_STRING16
8121 || token_type == CPP_STRING32)
8122 message = catenate_messages (gmsgid, " before string constant");
8123 else if (token_type == CPP_NUMBER)
8124 message = catenate_messages (gmsgid, " before numeric constant");
8125 else if (token_type == CPP_NAME)
8127 message = catenate_messages (gmsgid, " before %qE");
8128 error (message, value);
8132 else if (token_type == CPP_PRAGMA)
8133 message = catenate_messages (gmsgid, " before %<#pragma%>");
8134 else if (token_type == CPP_PRAGMA_EOL)
8135 message = catenate_messages (gmsgid, " before end of line");
8136 else if (token_type < N_TTYPES)
8138 message = catenate_messages (gmsgid, " before %qs token");
8139 error (message, cpp_type2name (token_type, token_flags));
8151 #undef catenate_messages
8154 /* Callback from cpp_error for PFILE to print diagnostics from the
8155 preprocessor. The diagnostic is of type LEVEL, at location
8156 LOCATION unless this is after lexing and the compiler's location
8157 should be used instead, with column number possibly overridden by
8158 COLUMN_OVERRIDE if not zero; MSG is the translated message and AP
8159 the arguments. Returns true if a diagnostic was emitted, false
8163 c_cpp_error (cpp_reader *pfile ATTRIBUTE_UNUSED, int level,
8164 location_t location, unsigned int column_override,
8165 const char *msg, va_list *ap)
8167 diagnostic_info diagnostic;
8168 diagnostic_t dlevel;
8169 int save_warn_system_headers = warn_system_headers;
8174 case CPP_DL_WARNING_SYSHDR:
8177 warn_system_headers = 1;
8179 case CPP_DL_WARNING:
8182 dlevel = DK_WARNING;
8184 case CPP_DL_PEDWARN:
8185 if (flag_no_output && !flag_pedantic_errors)
8187 dlevel = DK_PEDWARN;
8205 location = input_location;
8206 diagnostic_set_info_translated (&diagnostic, msg, ap,
8208 if (column_override)
8209 diagnostic_override_column (&diagnostic, column_override);
8210 ret = report_diagnostic (&diagnostic);
8211 if (level == CPP_DL_WARNING_SYSHDR)
8212 warn_system_headers = save_warn_system_headers;
8216 /* Walk a gimplified function and warn for functions whose return value is
8217 ignored and attribute((warn_unused_result)) is set. This is done before
8218 inlining, so we don't have to worry about that. */
8221 c_warn_unused_result (gimple_seq seq)
8224 gimple_stmt_iterator i;
8226 for (i = gsi_start (seq); !gsi_end_p (i); gsi_next (&i))
8228 gimple g = gsi_stmt (i);
8230 switch (gimple_code (g))
8233 c_warn_unused_result (gimple_bind_body (g));
8236 c_warn_unused_result (gimple_try_eval (g));
8237 c_warn_unused_result (gimple_try_cleanup (g));
8240 c_warn_unused_result (gimple_catch_handler (g));
8242 case GIMPLE_EH_FILTER:
8243 c_warn_unused_result (gimple_eh_filter_failure (g));
8247 if (gimple_call_lhs (g))
8250 /* This is a naked call, as opposed to a GIMPLE_CALL with an
8251 LHS. All calls whose value is ignored should be
8252 represented like this. Look for the attribute. */
8253 fdecl = gimple_call_fndecl (g);
8254 ftype = TREE_TYPE (TREE_TYPE (gimple_call_fn (g)));
8256 if (lookup_attribute ("warn_unused_result", TYPE_ATTRIBUTES (ftype)))
8258 location_t loc = gimple_location (g);
8261 warning (0, "%Hignoring return value of %qD, "
8262 "declared with attribute warn_unused_result",
8265 warning (0, "%Hignoring return value of function "
8266 "declared with attribute warn_unused_result",
8272 /* Not a container, not a call, or a call whose value is used. */
8278 /* Convert a character from the host to the target execution character
8279 set. cpplib handles this, mostly. */
8282 c_common_to_target_charset (HOST_WIDE_INT c)
8284 /* Character constants in GCC proper are sign-extended under -fsigned-char,
8285 zero-extended under -fno-signed-char. cpplib insists that characters
8286 and character constants are always unsigned. Hence we must convert
8288 cppchar_t uc = ((cppchar_t)c) & ((((cppchar_t)1) << CHAR_BIT)-1);
8290 uc = cpp_host_to_exec_charset (parse_in, uc);
8292 if (flag_signed_char)
8293 return ((HOST_WIDE_INT)uc) << (HOST_BITS_PER_WIDE_INT - CHAR_TYPE_SIZE)
8294 >> (HOST_BITS_PER_WIDE_INT - CHAR_TYPE_SIZE);
8299 /* Build the result of __builtin_offsetof. EXPR is a nested sequence of
8300 component references, with STOP_REF, or alternatively an INDIRECT_REF of
8301 NULL, at the bottom; much like the traditional rendering of offsetof as a
8302 macro. Returns the folded and properly cast result. */
8305 fold_offsetof_1 (tree expr, tree stop_ref)
8307 enum tree_code code = PLUS_EXPR;
8310 if (expr == stop_ref && TREE_CODE (expr) != ERROR_MARK)
8311 return size_zero_node;
8313 switch (TREE_CODE (expr))
8319 error ("cannot apply %<offsetof%> to static data member %qD", expr);
8320 return error_mark_node;
8324 error ("cannot apply %<offsetof%> when %<operator[]%> is overloaded");
8325 return error_mark_node;
8328 gcc_assert (integer_zerop (expr));
8329 return size_zero_node;
8333 base = fold_offsetof_1 (TREE_OPERAND (expr, 0), stop_ref);
8334 gcc_assert (base == error_mark_node || base == size_zero_node);
8338 base = fold_offsetof_1 (TREE_OPERAND (expr, 0), stop_ref);
8339 if (base == error_mark_node)
8342 t = TREE_OPERAND (expr, 1);
8343 if (DECL_C_BIT_FIELD (t))
8345 error ("attempt to take address of bit-field structure "
8347 return error_mark_node;
8349 off = size_binop (PLUS_EXPR, DECL_FIELD_OFFSET (t),
8350 size_int (tree_low_cst (DECL_FIELD_BIT_OFFSET (t), 1)
8355 base = fold_offsetof_1 (TREE_OPERAND (expr, 0), stop_ref);
8356 if (base == error_mark_node)
8359 t = TREE_OPERAND (expr, 1);
8360 if (TREE_CODE (t) == INTEGER_CST && tree_int_cst_sgn (t) < 0)
8363 t = fold_build1 (NEGATE_EXPR, TREE_TYPE (t), t);
8365 t = convert (sizetype, t);
8366 off = size_binop (MULT_EXPR, TYPE_SIZE_UNIT (TREE_TYPE (expr)), t);
8370 /* Handle static members of volatile structs. */
8371 t = TREE_OPERAND (expr, 1);
8372 gcc_assert (TREE_CODE (t) == VAR_DECL);
8373 return fold_offsetof_1 (t, stop_ref);
8379 return size_binop (code, base, off);
8383 fold_offsetof (tree expr, tree stop_ref)
8385 /* Convert back from the internal sizetype to size_t. */
8386 return convert (size_type_node, fold_offsetof_1 (expr, stop_ref));
8389 /* Print an error message for an invalid lvalue. USE says
8390 how the lvalue is being used and so selects the error message. */
8393 lvalue_error (enum lvalue_use use)
8398 error ("lvalue required as left operand of assignment");
8401 error ("lvalue required as increment operand");
8404 error ("lvalue required as decrement operand");
8407 error ("lvalue required as unary %<&%> operand");
8410 error ("lvalue required in asm statement");
8417 /* *PTYPE is an incomplete array. Complete it with a domain based on
8418 INITIAL_VALUE. If INITIAL_VALUE is not present, use 1 if DO_DEFAULT
8419 is true. Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
8420 2 if INITIAL_VALUE was NULL, and 3 if INITIAL_VALUE was empty. */
8423 complete_array_type (tree *ptype, tree initial_value, bool do_default)
8425 tree maxindex, type, main_type, elt, unqual_elt;
8426 int failure = 0, quals;
8427 hashval_t hashcode = 0;
8429 maxindex = size_zero_node;
8432 if (TREE_CODE (initial_value) == STRING_CST)
8435 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
8436 maxindex = size_int (TREE_STRING_LENGTH (initial_value)/eltsize - 1);
8438 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
8440 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
8442 if (VEC_empty (constructor_elt, v))
8446 maxindex = integer_minus_one_node;
8451 unsigned HOST_WIDE_INT cnt;
8452 constructor_elt *ce;
8453 bool fold_p = false;
8455 if (VEC_index (constructor_elt, v, 0)->index)
8456 maxindex = fold_convert (sizetype,
8457 VEC_index (constructor_elt,
8459 curindex = maxindex;
8462 VEC_iterate (constructor_elt, v, cnt, ce);
8465 bool curfold_p = false;
8467 curindex = ce->index, curfold_p = true;
8471 curindex = fold_convert (sizetype, curindex);
8472 curindex = size_binop (PLUS_EXPR, curindex, size_one_node);
8474 if (tree_int_cst_lt (maxindex, curindex))
8475 maxindex = curindex, fold_p = curfold_p;
8478 maxindex = fold_convert (sizetype, maxindex);
8483 /* Make an error message unless that happened already. */
8484 if (initial_value != error_mark_node)
8496 elt = TREE_TYPE (type);
8497 quals = TYPE_QUALS (strip_array_types (elt));
8501 unqual_elt = c_build_qualified_type (elt, TYPE_UNQUALIFIED);
8503 /* Using build_distinct_type_copy and modifying things afterward instead
8504 of using build_array_type to create a new type preserves all of the
8505 TYPE_LANG_FLAG_? bits that the front end may have set. */
8506 main_type = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
8507 TREE_TYPE (main_type) = unqual_elt;
8508 TYPE_DOMAIN (main_type) = build_index_type (maxindex);
8509 layout_type (main_type);
8511 /* Make sure we have the canonical MAIN_TYPE. */
8512 hashcode = iterative_hash_object (TYPE_HASH (unqual_elt), hashcode);
8513 hashcode = iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (main_type)),
8515 main_type = type_hash_canon (hashcode, main_type);
8517 /* Fix the canonical type. */
8518 if (TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (main_type))
8519 || TYPE_STRUCTURAL_EQUALITY_P (TYPE_DOMAIN (main_type)))
8520 SET_TYPE_STRUCTURAL_EQUALITY (main_type);
8521 else if (TYPE_CANONICAL (TREE_TYPE (main_type)) != TREE_TYPE (main_type)
8522 || (TYPE_CANONICAL (TYPE_DOMAIN (main_type))
8523 != TYPE_DOMAIN (main_type)))
8524 TYPE_CANONICAL (main_type)
8525 = build_array_type (TYPE_CANONICAL (TREE_TYPE (main_type)),
8526 TYPE_CANONICAL (TYPE_DOMAIN (main_type)));
8528 TYPE_CANONICAL (main_type) = main_type;
8533 type = c_build_qualified_type (main_type, quals);
8535 if (COMPLETE_TYPE_P (type)
8536 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8537 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8539 error ("size of array is too large");
8540 /* If we proceed with the array type as it is, we'll eventually
8541 crash in tree_low_cst(). */
8542 type = error_mark_node;
8550 /* Used to help initialize the builtin-types.def table. When a type of
8551 the correct size doesn't exist, use error_mark_node instead of NULL.
8552 The later results in segfaults even when a decl using the type doesn't
8556 builtin_type_for_size (int size, bool unsignedp)
8558 tree type = lang_hooks.types.type_for_size (size, unsignedp);
8559 return type ? type : error_mark_node;
8562 /* A helper function for resolve_overloaded_builtin in resolving the
8563 overloaded __sync_ builtins. Returns a positive power of 2 if the
8564 first operand of PARAMS is a pointer to a supported data type.
8565 Returns 0 if an error is encountered. */
8568 sync_resolve_size (tree function, VEC(tree,gc) *params)
8573 if (VEC_empty (tree, params))
8575 error ("too few arguments to function %qE", function);
8579 type = TREE_TYPE (VEC_index (tree, params, 0));
8580 if (TREE_CODE (type) != POINTER_TYPE)
8583 type = TREE_TYPE (type);
8584 if (!INTEGRAL_TYPE_P (type) && !POINTER_TYPE_P (type))
8587 size = tree_low_cst (TYPE_SIZE_UNIT (type), 1);
8588 if (size == 1 || size == 2 || size == 4 || size == 8 || size == 16)
8592 error ("incompatible type for argument %d of %qE", 1, function);
8596 /* A helper function for resolve_overloaded_builtin. Adds casts to
8597 PARAMS to make arguments match up with those of FUNCTION. Drops
8598 the variadic arguments at the end. Returns false if some error
8599 was encountered; true on success. */
8602 sync_resolve_params (tree orig_function, tree function, VEC(tree, gc) *params)
8604 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (function));
8607 unsigned int parmnum;
8609 /* We've declared the implementation functions to use "volatile void *"
8610 as the pointer parameter, so we shouldn't get any complaints from the
8611 call to check_function_arguments what ever type the user used. */
8612 arg_types = TREE_CHAIN (arg_types);
8613 ptype = TREE_TYPE (TREE_TYPE (VEC_index (tree, params, 0)));
8616 /* For the rest of the values, we need to cast these to FTYPE, so that we
8617 don't get warnings for passing pointer types, etc. */
8619 while (arg_types != void_list_node)
8624 if (VEC_length (tree, params) <= parmnum)
8626 error ("too few arguments to function %qE", orig_function);
8630 /* ??? Ideally for the first conversion we'd use convert_for_assignment
8631 so that we get warnings for anything that doesn't match the pointer
8632 type. This isn't portable across the C and C++ front ends atm. */
8633 val = VEC_index (tree, params, parmnum);
8634 val = convert (ptype, val);
8635 val = convert (TREE_VALUE (arg_types), val);
8636 VEC_replace (tree, params, parmnum, val);
8638 arg_types = TREE_CHAIN (arg_types);
8642 /* The definition of these primitives is variadic, with the remaining
8643 being "an optional list of variables protected by the memory barrier".
8644 No clue what that's supposed to mean, precisely, but we consider all
8645 call-clobbered variables to be protected so we're safe. */
8646 VEC_truncate (tree, params, parmnum + 1);
8651 /* A helper function for resolve_overloaded_builtin. Adds a cast to
8652 RESULT to make it match the type of the first pointer argument in
8656 sync_resolve_return (tree first_param, tree result)
8658 tree ptype = TREE_TYPE (TREE_TYPE (first_param));
8659 ptype = TYPE_MAIN_VARIANT (ptype);
8660 return convert (ptype, result);
8663 /* Some builtin functions are placeholders for other expressions. This
8664 function should be called immediately after parsing the call expression
8665 before surrounding code has committed to the type of the expression.
8667 LOC is the location of the builtin call.
8669 FUNCTION is the DECL that has been invoked; it is known to be a builtin.
8670 PARAMS is the argument list for the call. The return value is non-null
8671 when expansion is complete, and null if normal processing should
8675 resolve_overloaded_builtin (location_t loc, tree function, VEC(tree,gc) *params)
8677 enum built_in_function orig_code = DECL_FUNCTION_CODE (function);
8678 switch (DECL_BUILT_IN_CLASS (function))
8680 case BUILT_IN_NORMAL:
8683 if (targetm.resolve_overloaded_builtin)
8684 return targetm.resolve_overloaded_builtin (loc, function, params);
8691 /* Handle BUILT_IN_NORMAL here. */
8694 case BUILT_IN_FETCH_AND_ADD_N:
8695 case BUILT_IN_FETCH_AND_SUB_N:
8696 case BUILT_IN_FETCH_AND_OR_N:
8697 case BUILT_IN_FETCH_AND_AND_N:
8698 case BUILT_IN_FETCH_AND_XOR_N:
8699 case BUILT_IN_FETCH_AND_NAND_N:
8700 case BUILT_IN_ADD_AND_FETCH_N:
8701 case BUILT_IN_SUB_AND_FETCH_N:
8702 case BUILT_IN_OR_AND_FETCH_N:
8703 case BUILT_IN_AND_AND_FETCH_N:
8704 case BUILT_IN_XOR_AND_FETCH_N:
8705 case BUILT_IN_NAND_AND_FETCH_N:
8706 case BUILT_IN_BOOL_COMPARE_AND_SWAP_N:
8707 case BUILT_IN_VAL_COMPARE_AND_SWAP_N:
8708 case BUILT_IN_LOCK_TEST_AND_SET_N:
8709 case BUILT_IN_LOCK_RELEASE_N:
8711 int n = sync_resolve_size (function, params);
8712 tree new_function, first_param, result;
8715 return error_mark_node;
8717 new_function = built_in_decls[orig_code + exact_log2 (n) + 1];
8718 if (!sync_resolve_params (function, new_function, params))
8719 return error_mark_node;
8721 first_param = VEC_index (tree, params, 0);
8722 result = build_function_call_vec (loc, new_function, params, NULL);
8723 if (orig_code != BUILT_IN_BOOL_COMPARE_AND_SWAP_N
8724 && orig_code != BUILT_IN_LOCK_RELEASE_N)
8725 result = sync_resolve_return (first_param, result);
8735 /* Ignoring their sign, return true if two scalar types are the same. */
8737 same_scalar_type_ignoring_signedness (tree t1, tree t2)
8739 enum tree_code c1 = TREE_CODE (t1), c2 = TREE_CODE (t2);
8741 gcc_assert ((c1 == INTEGER_TYPE || c1 == REAL_TYPE || c1 == FIXED_POINT_TYPE)
8742 && (c2 == INTEGER_TYPE || c2 == REAL_TYPE
8743 || c2 == FIXED_POINT_TYPE));
8745 /* Equality works here because c_common_signed_type uses
8746 TYPE_MAIN_VARIANT. */
8747 return c_common_signed_type (t1)
8748 == c_common_signed_type (t2);
8751 /* Check for missing format attributes on function pointers. LTYPE is
8752 the new type or left-hand side type. RTYPE is the old type or
8753 right-hand side type. Returns TRUE if LTYPE is missing the desired
8757 check_missing_format_attribute (tree ltype, tree rtype)
8759 tree const ttr = TREE_TYPE (rtype), ttl = TREE_TYPE (ltype);
8762 for (ra = TYPE_ATTRIBUTES (ttr); ra; ra = TREE_CHAIN (ra))
8763 if (is_attribute_p ("format", TREE_PURPOSE (ra)))
8768 for (la = TYPE_ATTRIBUTES (ttl); la; la = TREE_CHAIN (la))
8769 if (is_attribute_p ("format", TREE_PURPOSE (la)))
8777 /* Subscripting with type char is likely to lose on a machine where
8778 chars are signed. So warn on any machine, but optionally. Don't
8779 warn for unsigned char since that type is safe. Don't warn for
8780 signed char because anyone who uses that must have done so
8781 deliberately. Furthermore, we reduce the false positive load by
8782 warning only for non-constant value of type char. */
8785 warn_array_subscript_with_type_char (tree index)
8787 if (TYPE_MAIN_VARIANT (TREE_TYPE (index)) == char_type_node
8788 && TREE_CODE (index) != INTEGER_CST)
8789 warning (OPT_Wchar_subscripts, "array subscript has type %<char%>");
8792 /* Implement -Wparentheses for the unexpected C precedence rules, to
8793 cover cases like x + y << z which readers are likely to
8794 misinterpret. We have seen an expression in which CODE is a binary
8795 operator used to combine expressions ARG_LEFT and ARG_RIGHT, which
8796 before folding had CODE_LEFT and CODE_RIGHT. CODE_LEFT and
8797 CODE_RIGHT may be ERROR_MARK, which means that that side of the
8798 expression was not formed using a binary or unary operator, or it
8799 was enclosed in parentheses. */
8802 warn_about_parentheses (enum tree_code code,
8803 enum tree_code code_left, tree arg_left,
8804 enum tree_code code_right, tree arg_right)
8806 if (!warn_parentheses)
8809 /* This macro tests that the expression ARG with original tree code
8810 CODE appears to be a boolean expression. or the result of folding a
8811 boolean expression. */
8812 #define APPEARS_TO_BE_BOOLEAN_EXPR_P(CODE, ARG) \
8813 (truth_value_p (TREE_CODE (ARG)) \
8814 || TREE_CODE (TREE_TYPE (ARG)) == BOOLEAN_TYPE \
8815 /* Folding may create 0 or 1 integers from other expressions. */ \
8816 || ((CODE) != INTEGER_CST \
8817 && (integer_onep (ARG) || integer_zerop (ARG))))
8822 if (code_left == PLUS_EXPR || code_right == PLUS_EXPR)
8823 warning (OPT_Wparentheses,
8824 "suggest parentheses around %<+%> inside %<<<%>");
8825 else if (code_left == MINUS_EXPR || code_right == MINUS_EXPR)
8826 warning (OPT_Wparentheses,
8827 "suggest parentheses around %<-%> inside %<<<%>");
8831 if (code_left == PLUS_EXPR || code_right == PLUS_EXPR)
8832 warning (OPT_Wparentheses,
8833 "suggest parentheses around %<+%> inside %<>>%>");
8834 else if (code_left == MINUS_EXPR || code_right == MINUS_EXPR)
8835 warning (OPT_Wparentheses,
8836 "suggest parentheses around %<-%> inside %<>>%>");
8839 case TRUTH_ORIF_EXPR:
8840 if (code_left == TRUTH_ANDIF_EXPR || code_right == TRUTH_ANDIF_EXPR)
8841 warning (OPT_Wparentheses,
8842 "suggest parentheses around %<&&%> within %<||%>");
8846 if (code_left == BIT_AND_EXPR || code_left == BIT_XOR_EXPR
8847 || code_left == PLUS_EXPR || code_left == MINUS_EXPR
8848 || code_right == BIT_AND_EXPR || code_right == BIT_XOR_EXPR
8849 || code_right == PLUS_EXPR || code_right == MINUS_EXPR)
8850 warning (OPT_Wparentheses,
8851 "suggest parentheses around arithmetic in operand of %<|%>");
8852 /* Check cases like x|y==z */
8853 else if (TREE_CODE_CLASS (code_left) == tcc_comparison
8854 || TREE_CODE_CLASS (code_right) == tcc_comparison)
8855 warning (OPT_Wparentheses,
8856 "suggest parentheses around comparison in operand of %<|%>");
8857 /* Check cases like !x | y */
8858 else if (code_left == TRUTH_NOT_EXPR
8859 && !APPEARS_TO_BE_BOOLEAN_EXPR_P (code_right, arg_right))
8860 warning (OPT_Wparentheses, "suggest parentheses around operand of "
8861 "%<!%> or change %<|%> to %<||%> or %<!%> to %<~%>");
8865 if (code_left == BIT_AND_EXPR
8866 || code_left == PLUS_EXPR || code_left == MINUS_EXPR
8867 || code_right == BIT_AND_EXPR
8868 || code_right == PLUS_EXPR || code_right == MINUS_EXPR)
8869 warning (OPT_Wparentheses,
8870 "suggest parentheses around arithmetic in operand of %<^%>");
8871 /* Check cases like x^y==z */
8872 else if (TREE_CODE_CLASS (code_left) == tcc_comparison
8873 || TREE_CODE_CLASS (code_right) == tcc_comparison)
8874 warning (OPT_Wparentheses,
8875 "suggest parentheses around comparison in operand of %<^%>");
8879 if (code_left == PLUS_EXPR || code_right == PLUS_EXPR)
8880 warning (OPT_Wparentheses,
8881 "suggest parentheses around %<+%> in operand of %<&%>");
8882 else if (code_left == MINUS_EXPR || code_right == MINUS_EXPR)
8883 warning (OPT_Wparentheses,
8884 "suggest parentheses around %<-%> in operand of %<&%>");
8885 /* Check cases like x&y==z */
8886 else if (TREE_CODE_CLASS (code_left) == tcc_comparison
8887 || TREE_CODE_CLASS (code_right) == tcc_comparison)
8888 warning (OPT_Wparentheses,
8889 "suggest parentheses around comparison in operand of %<&%>");
8890 /* Check cases like !x & y */
8891 else if (code_left == TRUTH_NOT_EXPR
8892 && !APPEARS_TO_BE_BOOLEAN_EXPR_P (code_right, arg_right))
8893 warning (OPT_Wparentheses, "suggest parentheses around operand of "
8894 "%<!%> or change %<&%> to %<&&%> or %<!%> to %<~%>");
8898 if (TREE_CODE_CLASS (code_left) == tcc_comparison
8899 || TREE_CODE_CLASS (code_right) == tcc_comparison)
8900 warning (OPT_Wparentheses,
8901 "suggest parentheses around comparison in operand of %<==%>");
8904 if (TREE_CODE_CLASS (code_left) == tcc_comparison
8905 || TREE_CODE_CLASS (code_right) == tcc_comparison)
8906 warning (OPT_Wparentheses,
8907 "suggest parentheses around comparison in operand of %<!=%>");
8911 if (TREE_CODE_CLASS (code) == tcc_comparison
8912 && ((TREE_CODE_CLASS (code_left) == tcc_comparison
8913 && code_left != NE_EXPR && code_left != EQ_EXPR
8914 && INTEGRAL_TYPE_P (TREE_TYPE (arg_left)))
8915 || (TREE_CODE_CLASS (code_right) == tcc_comparison
8916 && code_right != NE_EXPR && code_right != EQ_EXPR
8917 && INTEGRAL_TYPE_P (TREE_TYPE (arg_right)))))
8918 warning (OPT_Wparentheses, "comparisons like %<X<=Y<=Z%> do not "
8919 "have their mathematical meaning");
8922 #undef NOT_A_BOOLEAN_EXPR_P
8925 /* If LABEL (a LABEL_DECL) has not been used, issue a warning. */
8928 warn_for_unused_label (tree label)
8930 if (!TREE_USED (label))
8932 if (DECL_INITIAL (label))
8933 warning (OPT_Wunused_label, "label %q+D defined but not used", label);
8935 warning (OPT_Wunused_label, "label %q+D declared but not defined", label);
8939 #ifndef TARGET_HAS_TARGETCM
8940 struct gcc_targetcm targetcm = TARGETCM_INITIALIZER;
8943 /* Warn for division by zero according to the value of DIVISOR. LOC
8944 is the location of the division operator. */
8947 warn_for_div_by_zero (location_t loc, tree divisor)
8949 /* If DIVISOR is zero, and has integral or fixed-point type, issue a warning
8950 about division by zero. Do not issue a warning if DIVISOR has a
8951 floating-point type, since we consider 0.0/0.0 a valid way of
8952 generating a NaN. */
8953 if (c_inhibit_evaluation_warnings == 0
8954 && (integer_zerop (divisor) || fixed_zerop (divisor)))
8955 warning_at (loc, OPT_Wdiv_by_zero, "division by zero");
8958 /* Subroutine of build_binary_op. Give warnings for comparisons
8959 between signed and unsigned quantities that may fail. Do the
8960 checking based on the original operand trees ORIG_OP0 and ORIG_OP1,
8961 so that casts will be considered, but default promotions won't
8964 LOCATION is the location of the comparison operator.
8966 The arguments of this function map directly to local variables
8967 of build_binary_op. */
8970 warn_for_sign_compare (location_t location,
8971 tree orig_op0, tree orig_op1,
8973 tree result_type, enum tree_code resultcode)
8975 int op0_signed = !TYPE_UNSIGNED (TREE_TYPE (orig_op0));
8976 int op1_signed = !TYPE_UNSIGNED (TREE_TYPE (orig_op1));
8977 int unsignedp0, unsignedp1;
8979 /* In C++, check for comparison of different enum types. */
8981 && TREE_CODE (TREE_TYPE (orig_op0)) == ENUMERAL_TYPE
8982 && TREE_CODE (TREE_TYPE (orig_op1)) == ENUMERAL_TYPE
8983 && TYPE_MAIN_VARIANT (TREE_TYPE (orig_op0))
8984 != TYPE_MAIN_VARIANT (TREE_TYPE (orig_op1)))
8986 warning_at (location,
8987 OPT_Wsign_compare, "comparison between types %qT and %qT",
8988 TREE_TYPE (orig_op0), TREE_TYPE (orig_op1));
8991 /* Do not warn if the comparison is being done in a signed type,
8992 since the signed type will only be chosen if it can represent
8993 all the values of the unsigned type. */
8994 if (!TYPE_UNSIGNED (result_type))
8996 /* Do not warn if both operands are unsigned. */
8997 else if (op0_signed == op1_signed)
9001 tree sop, uop, base_type;
9005 sop = orig_op0, uop = orig_op1;
9007 sop = orig_op1, uop = orig_op0;
9009 STRIP_TYPE_NOPS (sop);
9010 STRIP_TYPE_NOPS (uop);
9011 base_type = (TREE_CODE (result_type) == COMPLEX_TYPE
9012 ? TREE_TYPE (result_type) : result_type);
9014 /* Do not warn if the signed quantity is an unsuffixed integer
9015 literal (or some static constant expression involving such
9016 literals or a conditional expression involving such literals)
9017 and it is non-negative. */
9018 if (tree_expr_nonnegative_warnv_p (sop, &ovf))
9020 /* Do not warn if the comparison is an equality operation, the
9021 unsigned quantity is an integral constant, and it would fit
9022 in the result if the result were signed. */
9023 else if (TREE_CODE (uop) == INTEGER_CST
9024 && (resultcode == EQ_EXPR || resultcode == NE_EXPR)
9025 && int_fits_type_p (uop, c_common_signed_type (base_type)))
9027 /* In C, do not warn if the unsigned quantity is an enumeration
9028 constant and its maximum value would fit in the result if the
9029 result were signed. */
9030 else if (!c_dialect_cxx() && TREE_CODE (uop) == INTEGER_CST
9031 && TREE_CODE (TREE_TYPE (uop)) == ENUMERAL_TYPE
9032 && int_fits_type_p (TYPE_MAX_VALUE (TREE_TYPE (uop)),
9033 c_common_signed_type (base_type)))
9036 warning_at (location,
9038 "comparison between signed and unsigned integer expressions");
9041 /* Warn if two unsigned values are being compared in a size larger
9042 than their original size, and one (and only one) is the result of
9043 a `~' operator. This comparison will always fail.
9045 Also warn if one operand is a constant, and the constant does not
9046 have all bits set that are set in the ~ operand when it is
9049 op0 = get_narrower (op0, &unsignedp0);
9050 op1 = get_narrower (op1, &unsignedp1);
9052 if ((TREE_CODE (op0) == BIT_NOT_EXPR)
9053 ^ (TREE_CODE (op1) == BIT_NOT_EXPR))
9055 if (TREE_CODE (op0) == BIT_NOT_EXPR)
9056 op0 = get_narrower (TREE_OPERAND (op0, 0), &unsignedp0);
9057 if (TREE_CODE (op1) == BIT_NOT_EXPR)
9058 op1 = get_narrower (TREE_OPERAND (op1, 0), &unsignedp1);
9060 if (host_integerp (op0, 0) || host_integerp (op1, 0))
9063 HOST_WIDE_INT constant, mask;
9067 if (host_integerp (op0, 0))
9070 unsignedp = unsignedp1;
9071 constant = tree_low_cst (op0, 0);
9076 unsignedp = unsignedp0;
9077 constant = tree_low_cst (op1, 0);
9080 bits = TYPE_PRECISION (TREE_TYPE (primop));
9081 if (bits < TYPE_PRECISION (result_type)
9082 && bits < HOST_BITS_PER_LONG && unsignedp)
9084 mask = (~ (HOST_WIDE_INT) 0) << bits;
9085 if ((mask & constant) != mask)
9088 warning (OPT_Wsign_compare,
9089 "promoted ~unsigned is always non-zero");
9091 warning_at (location, OPT_Wsign_compare,
9092 "comparison of promoted ~unsigned with constant");
9096 else if (unsignedp0 && unsignedp1
9097 && (TYPE_PRECISION (TREE_TYPE (op0))
9098 < TYPE_PRECISION (result_type))
9099 && (TYPE_PRECISION (TREE_TYPE (op1))
9100 < TYPE_PRECISION (result_type)))
9101 warning_at (location, OPT_Wsign_compare,
9102 "comparison of promoted ~unsigned with unsigned");
9106 /* Setup a TYPE_DECL node as a typedef representation.
9108 X is a TYPE_DECL for a typedef statement. Create a brand new
9109 ..._TYPE node (which will be just a variant of the existing
9110 ..._TYPE node with identical properties) and then install X
9111 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
9113 The whole point here is to end up with a situation where each
9114 and every ..._TYPE node the compiler creates will be uniquely
9115 associated with AT MOST one node representing a typedef name.
9116 This way, even though the compiler substitutes corresponding
9117 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
9118 early on, later parts of the compiler can always do the reverse
9119 translation and get back the corresponding typedef name. For
9122 typedef struct S MY_TYPE;
9125 Later parts of the compiler might only know that `object' was of
9126 type `struct S' if it were not for code just below. With this
9127 code however, later parts of the compiler see something like:
9129 struct S' == struct S
9130 typedef struct S' MY_TYPE;
9133 And they can then deduce (from the node for type struct S') that
9134 the original object declaration was:
9138 Being able to do this is important for proper support of protoize,
9139 and also for generating precise symbolic debugging information
9140 which takes full account of the programmer's (typedef) vocabulary.
9142 Obviously, we don't want to generate a duplicate ..._TYPE node if
9143 the TYPE_DECL node that we are now processing really represents a
9144 standard built-in type. */
9147 set_underlying_type (tree x)
9149 if (x == error_mark_node)
9151 if (DECL_IS_BUILTIN (x))
9153 if (TYPE_NAME (TREE_TYPE (x)) == 0)
9154 TYPE_NAME (TREE_TYPE (x)) = x;
9156 else if (TREE_TYPE (x) != error_mark_node
9157 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
9159 tree tt = TREE_TYPE (x);
9160 DECL_ORIGINAL_TYPE (x) = tt;
9161 tt = build_variant_type_copy (tt);
9162 TYPE_STUB_DECL (tt) = TYPE_STUB_DECL (DECL_ORIGINAL_TYPE (x));
9164 TREE_USED (tt) = TREE_USED (x);
9169 /* Returns true if X is a typedef decl. */
9172 is_typedef_decl (tree x)
9174 return (x && TREE_CODE (x) == TYPE_DECL
9175 && DECL_ORIGINAL_TYPE (x) != NULL_TREE);
9178 /* The C and C++ parsers both use vectors to hold function arguments.
9179 For efficiency, we keep a cache of unused vectors. This is the
9182 typedef VEC(tree,gc)* tree_gc_vec;
9183 DEF_VEC_P(tree_gc_vec);
9184 DEF_VEC_ALLOC_P(tree_gc_vec,gc);
9185 static GTY((deletable)) VEC(tree_gc_vec,gc) *tree_vector_cache;
9187 /* Return a new vector from the cache. If the cache is empty,
9188 allocate a new vector. These vectors are GC'ed, so it is OK if the
9189 pointer is not released.. */
9192 make_tree_vector (void)
9194 if (!VEC_empty (tree_gc_vec, tree_vector_cache))
9195 return VEC_pop (tree_gc_vec, tree_vector_cache);
9198 /* Passing 0 to VEC_alloc returns NULL, and our callers require
9199 that we always return a non-NULL value. The vector code uses
9200 4 when growing a NULL vector, so we do too. */
9201 return VEC_alloc (tree, gc, 4);
9205 /* Release a vector of trees back to the cache. */
9208 release_tree_vector (VEC(tree,gc) *vec)
9212 VEC_truncate (tree, vec, 0);
9213 VEC_safe_push (tree_gc_vec, gc, tree_vector_cache, vec);
9217 /* Get a new tree vector holding a single tree. */
9220 make_tree_vector_single (tree t)
9222 VEC(tree,gc) *ret = make_tree_vector ();
9223 VEC_quick_push (tree, ret, t);
9227 /* Get a new tree vector which is a copy of an existing one. */
9230 make_tree_vector_copy (const VEC(tree,gc) *orig)
9236 ret = make_tree_vector ();
9237 VEC_reserve (tree, gc, ret, VEC_length (tree, orig));
9238 for (ix = 0; VEC_iterate (tree, orig, ix, t); ++ix)
9239 VEC_quick_push (tree, ret, t);
9243 #include "gt-c-common.h"