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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
24 #include "coretypes.h"
36 #include "diagnostic.h"
41 #include "langhooks.h"
42 #include "tree-inline.h"
45 #include "tree-iterator.h"
47 #include "tree-mudflap.h"
51 cpp_reader
*parse_in
; /* Declared in c-pragma.h. */
53 /* We let tm.h override the types used here, to handle trivial differences
54 such as the choice of unsigned int or long unsigned int for size_t.
55 When machines start needing nontrivial differences in the size type,
56 it would be best to do something here to figure out automatically
57 from other information what type to use. */
60 #define SIZE_TYPE "long unsigned int"
64 #define PID_TYPE "int"
68 #define WCHAR_TYPE "int"
71 /* WCHAR_TYPE gets overridden by -fshort-wchar. */
72 #define MODIFIED_WCHAR_TYPE \
73 (flag_short_wchar ? "short unsigned int" : WCHAR_TYPE)
76 #define PTRDIFF_TYPE "long int"
80 #define WINT_TYPE "unsigned int"
84 #define INTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
86 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
92 #define UINTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
94 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
95 ? "long unsigned int" \
96 : "long long unsigned int"))
99 /* The following symbols are subsumed in the c_global_trees array, and
100 listed here individually for documentation purposes.
102 INTEGER_TYPE and REAL_TYPE nodes for the standard data types.
104 tree short_integer_type_node;
105 tree long_integer_type_node;
106 tree long_long_integer_type_node;
108 tree short_unsigned_type_node;
109 tree long_unsigned_type_node;
110 tree long_long_unsigned_type_node;
112 tree truthvalue_type_node;
113 tree truthvalue_false_node;
114 tree truthvalue_true_node;
116 tree ptrdiff_type_node;
118 tree unsigned_char_type_node;
119 tree signed_char_type_node;
120 tree wchar_type_node;
121 tree signed_wchar_type_node;
122 tree unsigned_wchar_type_node;
124 tree float_type_node;
125 tree double_type_node;
126 tree long_double_type_node;
128 tree complex_integer_type_node;
129 tree complex_float_type_node;
130 tree complex_double_type_node;
131 tree complex_long_double_type_node;
133 tree intQI_type_node;
134 tree intHI_type_node;
135 tree intSI_type_node;
136 tree intDI_type_node;
137 tree intTI_type_node;
139 tree unsigned_intQI_type_node;
140 tree unsigned_intHI_type_node;
141 tree unsigned_intSI_type_node;
142 tree unsigned_intDI_type_node;
143 tree unsigned_intTI_type_node;
145 tree widest_integer_literal_type_node;
146 tree widest_unsigned_literal_type_node;
148 Nodes for types `void *' and `const void *'.
150 tree ptr_type_node, const_ptr_type_node;
152 Nodes for types `char *' and `const char *'.
154 tree string_type_node, const_string_type_node;
156 Type `char[SOMENUMBER]'.
157 Used when an array of char is needed and the size is irrelevant.
159 tree char_array_type_node;
161 Type `int[SOMENUMBER]' or something like it.
162 Used when an array of int needed and the size is irrelevant.
164 tree int_array_type_node;
166 Type `wchar_t[SOMENUMBER]' or something like it.
167 Used when a wide string literal is created.
169 tree wchar_array_type_node;
171 Type `int ()' -- used for implicit declaration of functions.
173 tree default_function_type;
175 A VOID_TYPE node, packaged in a TREE_LIST.
179 The lazily created VAR_DECLs for __FUNCTION__, __PRETTY_FUNCTION__,
180 and __func__. (C doesn't generate __FUNCTION__ and__PRETTY_FUNCTION__
181 VAR_DECLS, but C++ does.)
183 tree function_name_decl_node;
184 tree pretty_function_name_decl_node;
185 tree c99_function_name_decl_node;
187 Stack of nested function name VAR_DECLs.
189 tree saved_function_name_decls;
193 tree c_global_trees
[CTI_MAX
];
195 /* TRUE if a code represents a statement. The front end init
196 langhook should take care of initialization of this array. */
198 bool statement_code_p
[MAX_TREE_CODES
];
200 /* Switches common to the C front ends. */
202 /* Nonzero if prepreprocessing only. */
204 int flag_preprocess_only
;
206 /* Nonzero means don't output line number information. */
208 char flag_no_line_commands
;
210 /* Nonzero causes -E output not to be done, but directives such as
211 #define that have side effects are still obeyed. */
215 /* Nonzero means dump macros in some fashion. */
217 char flag_dump_macros
;
219 /* Nonzero means pass #include lines through to the output. */
221 char flag_dump_includes
;
223 /* Nonzero means process PCH files while preprocessing. */
225 bool flag_pch_preprocess
;
227 /* The file name to which we should write a precompiled header, or
228 NULL if no header will be written in this compile. */
230 const char *pch_file
;
232 /* Nonzero if an ISO standard was selected. It rejects macros in the
236 /* Nonzero if -undef was given. It suppresses target built-in macros
240 /* Nonzero means don't recognize the non-ANSI builtin functions. */
244 /* Nonzero means don't recognize the non-ANSI builtin functions.
247 int flag_no_nonansi_builtin
;
249 /* Nonzero means give `double' the same size as `float'. */
251 int flag_short_double
;
253 /* Nonzero means give `wchar_t' the same size as `short'. */
255 int flag_short_wchar
;
257 /* Nonzero means allow Microsoft extensions without warnings or errors. */
258 int flag_ms_extensions
;
260 /* Nonzero means don't recognize the keyword `asm'. */
264 /* Nonzero means give string constants the type `const char *', as mandated
267 int flag_const_strings
;
269 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
271 int flag_signed_bitfields
= 1;
273 /* Nonzero means warn about deprecated conversion from string constant to
276 int warn_write_strings
;
278 /* Warn about #pragma directives that are not recognized. */
280 int warn_unknown_pragmas
; /* Tri state variable. */
282 /* Warn about format/argument anomalies in calls to formatted I/O functions
283 (*printf, *scanf, strftime, strfmon, etc.). */
287 /* Zero means that faster, ...NonNil variants of objc_msgSend...
288 calls will be used in ObjC; passing nil receivers to such calls
289 will most likely result in crashes. */
290 int flag_nil_receivers
= 1;
292 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
293 @try, etc.) in source code. */
294 int flag_objc_exceptions
= 0;
296 /* Nonzero means that we generate NeXT setjmp based exceptions. */
297 int flag_objc_sjlj_exceptions
= -1;
299 /* Nonzero means that code generation will be altered to support
300 "zero-link" execution. This currently affects ObjC only, but may
301 affect other languages in the future. */
302 int flag_zero_link
= 0;
304 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
305 unit. It will inform the ObjC runtime that class definition(s) herein
306 contained are to replace one(s) previously loaded. */
307 int flag_replace_objc_classes
= 0;
309 /* C/ObjC language option variables. */
312 /* Nonzero means allow type mismatches in conditional expressions;
313 just make their values `void'. */
315 int flag_cond_mismatch
;
317 /* Nonzero means enable C89 Amendment 1 features. */
321 /* Nonzero means use the ISO C99 dialect of C. */
325 /* Nonzero means that we have builtin functions, and main is an int. */
329 /* Warn if main is suspicious. */
334 /* ObjC language option variables. */
337 /* Open and close the file for outputting class declarations, if
340 int flag_gen_declaration
;
342 /* Generate code for GNU or NeXT runtime environment. */
344 #ifdef NEXT_OBJC_RUNTIME
345 int flag_next_runtime
= 1;
347 int flag_next_runtime
= 0;
350 /* Tells the compiler that this is a special run. Do not perform any
351 compiling, instead we are to test some platform dependent features
352 and output a C header file with appropriate definitions. */
354 int print_struct_values
;
356 /* ???. Undocumented. */
358 const char *constant_string_class_name
;
361 /* C++ language option variables. */
364 /* Nonzero means don't recognize any extension keywords. */
366 int flag_no_gnu_keywords
;
368 /* Nonzero means do emit exported implementations of functions even if
369 they can be inlined. */
371 int flag_implement_inlines
= 1;
373 /* Nonzero means that implicit instantiations will be emitted if needed. */
375 int flag_implicit_templates
= 1;
377 /* Nonzero means that implicit instantiations of inline templates will be
378 emitted if needed, even if instantiations of non-inline templates
381 int flag_implicit_inline_templates
= 1;
383 /* Nonzero means generate separate instantiation control files and
384 juggle them at link time. */
386 int flag_use_repository
;
388 /* Nonzero if we want to issue diagnostics that the standard says are not
391 int flag_optional_diags
= 1;
393 /* Nonzero means we should attempt to elide constructors when possible. */
395 int flag_elide_constructors
= 1;
397 /* Nonzero means that member functions defined in class scope are
398 inline by default. */
400 int flag_default_inline
= 1;
402 /* Controls whether compiler generates 'type descriptor' that give
403 run-time type information. */
407 /* Nonzero if we want to conserve space in the .o files. We do this
408 by putting uninitialized data and runtime initialized data into
409 .common instead of .data at the expense of not flagging multiple
412 int flag_conserve_space
;
414 /* Nonzero if we want to obey access control semantics. */
416 int flag_access_control
= 1;
418 /* Nonzero if we want to check the return value of new and avoid calling
419 constructors if it is a null pointer. */
423 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
424 initialization variables.
425 0: Old rules, set by -fno-for-scope.
426 2: New ISO rules, set by -ffor-scope.
427 1: Try to implement new ISO rules, but with backup compatibility
428 (and warnings). This is the default, for now. */
430 int flag_new_for_scope
= 1;
432 /* Nonzero if we want to emit defined symbols with common-like linkage as
433 weak symbols where possible, in order to conform to C++ semantics.
434 Otherwise, emit them as local symbols. */
438 /* 0 means we want the preprocessor to not emit line directives for
439 the current working directory. 1 means we want it to do it. -1
440 means we should decide depending on whether debugging information
441 is being emitted or not. */
443 int flag_working_directory
= -1;
445 /* Nonzero to use __cxa_atexit, rather than atexit, to register
446 destructors for local statics and global objects. */
448 int flag_use_cxa_atexit
= DEFAULT_USE_CXA_ATEXIT
;
450 /* Nonzero means make the default pedwarns warnings instead of errors.
451 The value of this flag is ignored if -pedantic is specified. */
455 /* Nonzero means to implement standard semantics for exception
456 specifications, calling unexpected if an exception is thrown that
457 doesn't match the specification. Zero means to treat them as
458 assertions and optimize accordingly, but not check them. */
460 int flag_enforce_eh_specs
= 1;
462 /* Nonzero means to generate thread-safe code for initializing local
465 int flag_threadsafe_statics
= 1;
467 /* Nonzero means warn about implicit declarations. */
469 int warn_implicit
= 1;
471 /* Maximum template instantiation depth. This limit is rather
472 arbitrary, but it exists to limit the time it takes to notice
473 infinite template instantiations. */
475 int max_tinst_depth
= 500;
479 /* The elements of `ridpointers' are identifier nodes for the reserved
480 type names and storage classes. It is indexed by a RID_... value. */
483 tree (*make_fname_decl
) (tree
, int);
485 /* Nonzero means the expression being parsed will never be evaluated.
486 This is a count, since unevaluated expressions can nest. */
489 /* Information about how a function name is generated. */
492 tree
*const decl
; /* pointer to the VAR_DECL. */
493 const unsigned rid
; /* RID number for the identifier. */
494 const int pretty
; /* How pretty is it? */
497 /* The three ways of getting then name of the current function. */
499 const struct fname_var_t fname_vars
[] =
501 /* C99 compliant __func__, must be first. */
502 {&c99_function_name_decl_node
, RID_C99_FUNCTION_NAME
, 0},
503 /* GCC __FUNCTION__ compliant. */
504 {&function_name_decl_node
, RID_FUNCTION_NAME
, 0},
505 /* GCC __PRETTY_FUNCTION__ compliant. */
506 {&pretty_function_name_decl_node
, RID_PRETTY_FUNCTION_NAME
, 1},
510 static int constant_fits_type_p (tree
, tree
);
511 static tree
check_case_value (tree
);
512 static bool check_case_bounds (tree
, tree
, tree
*, tree
*);
514 static tree
handle_packed_attribute (tree
*, tree
, tree
, int, bool *);
515 static tree
handle_nocommon_attribute (tree
*, tree
, tree
, int, bool *);
516 static tree
handle_common_attribute (tree
*, tree
, tree
, int, bool *);
517 static tree
handle_noreturn_attribute (tree
*, tree
, tree
, int, bool *);
518 static tree
handle_noinline_attribute (tree
*, tree
, tree
, int, bool *);
519 static tree
handle_always_inline_attribute (tree
*, tree
, tree
, int,
521 static tree
handle_used_attribute (tree
*, tree
, tree
, int, bool *);
522 static tree
handle_unused_attribute (tree
*, tree
, tree
, int, bool *);
523 static tree
handle_const_attribute (tree
*, tree
, tree
, int, bool *);
524 static tree
handle_transparent_union_attribute (tree
*, tree
, tree
,
526 static tree
handle_constructor_attribute (tree
*, tree
, tree
, int, bool *);
527 static tree
handle_destructor_attribute (tree
*, tree
, tree
, int, bool *);
528 static tree
handle_mode_attribute (tree
*, tree
, tree
, int, bool *);
529 static tree
handle_section_attribute (tree
*, tree
, tree
, int, bool *);
530 static tree
handle_aligned_attribute (tree
*, tree
, tree
, int, bool *);
531 static tree
handle_weak_attribute (tree
*, tree
, tree
, int, bool *) ;
532 static tree
handle_alias_attribute (tree
*, tree
, tree
, int, bool *);
533 static tree
handle_visibility_attribute (tree
*, tree
, tree
, int,
535 static tree
handle_tls_model_attribute (tree
*, tree
, tree
, int,
537 static tree
handle_no_instrument_function_attribute (tree
*, tree
,
539 static tree
handle_malloc_attribute (tree
*, tree
, tree
, int, bool *);
540 static tree
handle_returns_twice_attribute (tree
*, tree
, tree
, int, bool *);
541 static tree
handle_no_limit_stack_attribute (tree
*, tree
, tree
, int,
543 static tree
handle_pure_attribute (tree
*, tree
, tree
, int, bool *);
544 static tree
handle_novops_attribute (tree
*, tree
, tree
, int, bool *);
545 static tree
handle_deprecated_attribute (tree
*, tree
, tree
, int,
547 static tree
handle_vector_size_attribute (tree
*, tree
, tree
, int,
549 static tree
handle_nonnull_attribute (tree
*, tree
, tree
, int, bool *);
550 static tree
handle_nothrow_attribute (tree
*, tree
, tree
, int, bool *);
551 static tree
handle_cleanup_attribute (tree
*, tree
, tree
, int, bool *);
552 static tree
handle_warn_unused_result_attribute (tree
*, tree
, tree
, int,
554 static tree
handle_sentinel_attribute (tree
*, tree
, tree
, int, bool *);
556 static void check_function_nonnull (tree
, tree
);
557 static void check_nonnull_arg (void *, tree
, unsigned HOST_WIDE_INT
);
558 static bool nonnull_check_p (tree
, unsigned HOST_WIDE_INT
);
559 static bool get_nonnull_operand (tree
, unsigned HOST_WIDE_INT
*);
560 static int resort_field_decl_cmp (const void *, const void *);
562 /* Table of machine-independent attributes common to all C-like languages. */
563 const struct attribute_spec c_common_attribute_table
[] =
565 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
566 { "packed", 0, 0, false, false, false,
567 handle_packed_attribute
},
568 { "nocommon", 0, 0, true, false, false,
569 handle_nocommon_attribute
},
570 { "common", 0, 0, true, false, false,
571 handle_common_attribute
},
572 /* FIXME: logically, noreturn attributes should be listed as
573 "false, true, true" and apply to function types. But implementing this
574 would require all the places in the compiler that use TREE_THIS_VOLATILE
575 on a decl to identify non-returning functions to be located and fixed
576 to check the function type instead. */
577 { "noreturn", 0, 0, true, false, false,
578 handle_noreturn_attribute
},
579 { "volatile", 0, 0, true, false, false,
580 handle_noreturn_attribute
},
581 { "noinline", 0, 0, true, false, false,
582 handle_noinline_attribute
},
583 { "always_inline", 0, 0, true, false, false,
584 handle_always_inline_attribute
},
585 { "used", 0, 0, true, false, false,
586 handle_used_attribute
},
587 { "unused", 0, 0, false, false, false,
588 handle_unused_attribute
},
589 /* The same comments as for noreturn attributes apply to const ones. */
590 { "const", 0, 0, true, false, false,
591 handle_const_attribute
},
592 { "transparent_union", 0, 0, false, false, false,
593 handle_transparent_union_attribute
},
594 { "constructor", 0, 0, true, false, false,
595 handle_constructor_attribute
},
596 { "destructor", 0, 0, true, false, false,
597 handle_destructor_attribute
},
598 { "mode", 1, 1, false, true, false,
599 handle_mode_attribute
},
600 { "section", 1, 1, true, false, false,
601 handle_section_attribute
},
602 { "aligned", 0, 1, false, false, false,
603 handle_aligned_attribute
},
604 { "weak", 0, 0, true, false, false,
605 handle_weak_attribute
},
606 { "alias", 1, 1, true, false, false,
607 handle_alias_attribute
},
608 { "no_instrument_function", 0, 0, true, false, false,
609 handle_no_instrument_function_attribute
},
610 { "malloc", 0, 0, true, false, false,
611 handle_malloc_attribute
},
612 { "returns_twice", 0, 0, true, false, false,
613 handle_returns_twice_attribute
},
614 { "no_stack_limit", 0, 0, true, false, false,
615 handle_no_limit_stack_attribute
},
616 { "pure", 0, 0, true, false, false,
617 handle_pure_attribute
},
618 /* For internal use (marking of builtins) only. The name contains space
619 to prevent its usage in source code. */
620 { "no vops", 0, 0, true, false, false,
621 handle_novops_attribute
},
622 { "deprecated", 0, 0, false, false, false,
623 handle_deprecated_attribute
},
624 { "vector_size", 1, 1, false, true, false,
625 handle_vector_size_attribute
},
626 { "visibility", 1, 1, false, false, false,
627 handle_visibility_attribute
},
628 { "tls_model", 1, 1, true, false, false,
629 handle_tls_model_attribute
},
630 { "nonnull", 0, -1, false, true, true,
631 handle_nonnull_attribute
},
632 { "nothrow", 0, 0, true, false, false,
633 handle_nothrow_attribute
},
634 { "may_alias", 0, 0, false, true, false, NULL
},
635 { "cleanup", 1, 1, true, false, false,
636 handle_cleanup_attribute
},
637 { "warn_unused_result", 0, 0, false, true, true,
638 handle_warn_unused_result_attribute
},
639 { "sentinel", 0, 1, false, true, true,
640 handle_sentinel_attribute
},
641 { NULL
, 0, 0, false, false, false, NULL
}
644 /* Give the specifications for the format attributes, used by C and all
647 const struct attribute_spec c_common_format_attribute_table
[] =
649 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
650 { "format", 3, 3, false, true, true,
651 handle_format_attribute
},
652 { "format_arg", 1, 1, false, true, true,
653 handle_format_arg_attribute
},
654 { NULL
, 0, 0, false, false, false, NULL
}
657 /* Push current bindings for the function name VAR_DECLS. */
660 start_fname_decls (void)
663 tree saved
= NULL_TREE
;
665 for (ix
= 0; fname_vars
[ix
].decl
; ix
++)
667 tree decl
= *fname_vars
[ix
].decl
;
671 saved
= tree_cons (decl
, build_int_cst (NULL_TREE
, ix
), saved
);
672 *fname_vars
[ix
].decl
= NULL_TREE
;
675 if (saved
|| saved_function_name_decls
)
676 /* Normally they'll have been NULL, so only push if we've got a
677 stack, or they are non-NULL. */
678 saved_function_name_decls
= tree_cons (saved
, NULL_TREE
,
679 saved_function_name_decls
);
682 /* Finish up the current bindings, adding them into the current function's
683 statement tree. This must be done _before_ finish_stmt_tree is called.
684 If there is no current function, we must be at file scope and no statements
685 are involved. Pop the previous bindings. */
688 finish_fname_decls (void)
691 tree stmts
= NULL_TREE
;
692 tree stack
= saved_function_name_decls
;
694 for (; stack
&& TREE_VALUE (stack
); stack
= TREE_CHAIN (stack
))
695 append_to_statement_list (TREE_VALUE (stack
), &stmts
);
699 tree
*bodyp
= &DECL_SAVED_TREE (current_function_decl
);
701 if (TREE_CODE (*bodyp
) == BIND_EXPR
)
702 bodyp
= &BIND_EXPR_BODY (*bodyp
);
704 append_to_statement_list (*bodyp
, &stmts
);
708 for (ix
= 0; fname_vars
[ix
].decl
; ix
++)
709 *fname_vars
[ix
].decl
= NULL_TREE
;
713 /* We had saved values, restore them. */
716 for (saved
= TREE_PURPOSE (stack
); saved
; saved
= TREE_CHAIN (saved
))
718 tree decl
= TREE_PURPOSE (saved
);
719 unsigned ix
= TREE_INT_CST_LOW (TREE_VALUE (saved
));
721 *fname_vars
[ix
].decl
= decl
;
723 stack
= TREE_CHAIN (stack
);
725 saved_function_name_decls
= stack
;
728 /* Return the text name of the current function, suitably prettified
729 by PRETTY_P. Return string must be freed by caller. */
732 fname_as_string (int pretty_p
)
734 const char *name
= "top level";
744 if (current_function_decl
)
745 name
= lang_hooks
.decl_printable_name (current_function_decl
, vrb
);
747 if (c_lex_string_translate
)
749 int len
= strlen (name
) + 3; /* Two for '"'s. One for NULL. */
750 cpp_string cstr
= { 0, 0 }, strname
;
752 namep
= XNEWVEC (char, len
);
753 snprintf (namep
, len
, "\"%s\"", name
);
754 strname
.text
= (unsigned char *) namep
;
755 strname
.len
= len
- 1;
757 if (cpp_interpret_string (parse_in
, &strname
, 1, &cstr
, false))
760 return (char *) cstr
.text
;
764 namep
= xstrdup (name
);
769 /* Expand DECL if it declares an entity not handled by the
773 c_expand_decl (tree decl
)
775 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
777 /* Let the back-end know about this variable. */
778 if (!anon_aggr_type_p (TREE_TYPE (decl
)))
779 emit_local_var (decl
);
781 expand_anon_union_decl (decl
, NULL_TREE
,
782 DECL_ANON_UNION_ELEMS (decl
));
791 /* Return the VAR_DECL for a const char array naming the current
792 function. If the VAR_DECL has not yet been created, create it
793 now. RID indicates how it should be formatted and IDENTIFIER_NODE
794 ID is its name (unfortunately C and C++ hold the RID values of
795 keywords in different places, so we can't derive RID from ID in
796 this language independent code. */
799 fname_decl (unsigned int rid
, tree id
)
802 tree decl
= NULL_TREE
;
804 for (ix
= 0; fname_vars
[ix
].decl
; ix
++)
805 if (fname_vars
[ix
].rid
== rid
)
808 decl
= *fname_vars
[ix
].decl
;
811 /* If a tree is built here, it would normally have the lineno of
812 the current statement. Later this tree will be moved to the
813 beginning of the function and this line number will be wrong.
814 To avoid this problem set the lineno to 0 here; that prevents
815 it from appearing in the RTL. */
817 location_t saved_location
= input_location
;
818 #ifdef USE_MAPPED_LOCATION
819 input_location
= UNKNOWN_LOCATION
;
824 stmts
= push_stmt_list ();
825 decl
= (*make_fname_decl
) (id
, fname_vars
[ix
].pretty
);
826 stmts
= pop_stmt_list (stmts
);
827 if (!IS_EMPTY_STMT (stmts
))
828 saved_function_name_decls
829 = tree_cons (decl
, stmts
, saved_function_name_decls
);
830 *fname_vars
[ix
].decl
= decl
;
831 input_location
= saved_location
;
833 if (!ix
&& !current_function_decl
)
834 pedwarn ("%qD is not defined outside of function scope", decl
);
839 /* Given a STRING_CST, give it a suitable array-of-chars data type. */
842 fix_string_type (tree value
)
844 const int wchar_bytes
= TYPE_PRECISION (wchar_type_node
) / BITS_PER_UNIT
;
845 const int wide_flag
= TREE_TYPE (value
) == wchar_array_type_node
;
846 const int nchars_max
= flag_isoc99
? 4095 : 509;
847 int length
= TREE_STRING_LENGTH (value
);
849 tree e_type
, i_type
, a_type
;
851 /* Compute the number of elements, for the array type. */
852 nchars
= wide_flag
? length
/ wchar_bytes
: length
;
854 if (pedantic
&& nchars
- 1 > nchars_max
&& !c_dialect_cxx ())
855 pedwarn ("string length %qd is greater than the length %qd ISO C%d compilers are required to support",
856 nchars
- 1, nchars_max
, flag_isoc99
? 99 : 89);
858 e_type
= wide_flag
? wchar_type_node
: char_type_node
;
859 /* Create the array type for the string constant. flag_const_strings
860 says make the string constant an array of const char so that
861 copying it to a non-const pointer will get a warning. For C++,
862 this is the standard behavior.
864 The C++ front end relies on TYPE_MAIN_VARIANT of a cv-qualified
865 array type being the unqualified version of that type.
866 Therefore, if we are constructing an array of const char, we must
867 construct the matching unqualified array type first. The C front
868 end does not require this, but it does no harm, so we do it
870 i_type
= build_index_type (build_int_cst (NULL_TREE
, nchars
- 1));
871 a_type
= build_array_type (e_type
, i_type
);
872 if (flag_const_strings
)
873 a_type
= c_build_qualified_type (a_type
, TYPE_QUAL_CONST
);
875 TREE_TYPE (value
) = a_type
;
876 TREE_CONSTANT (value
) = 1;
877 TREE_INVARIANT (value
) = 1;
878 TREE_READONLY (value
) = 1;
879 TREE_STATIC (value
) = 1;
883 /* Print a warning if a constant expression had overflow in folding.
884 Invoke this function on every expression that the language
885 requires to be a constant expression.
886 Note the ANSI C standard says it is erroneous for a
887 constant expression to overflow. */
890 constant_expression_warning (tree value
)
892 if ((TREE_CODE (value
) == INTEGER_CST
|| TREE_CODE (value
) == REAL_CST
893 || TREE_CODE (value
) == VECTOR_CST
894 || TREE_CODE (value
) == COMPLEX_CST
)
895 && TREE_CONSTANT_OVERFLOW (value
) && pedantic
)
896 pedwarn ("overflow in constant expression");
899 /* Print a warning if an expression had overflow in folding.
900 Invoke this function on every expression that
901 (1) appears in the source code, and
902 (2) might be a constant expression that overflowed, and
903 (3) is not already checked by convert_and_check;
904 however, do not invoke this function on operands of explicit casts. */
907 overflow_warning (tree value
)
909 if ((TREE_CODE (value
) == INTEGER_CST
910 || (TREE_CODE (value
) == COMPLEX_CST
911 && TREE_CODE (TREE_REALPART (value
)) == INTEGER_CST
))
912 && TREE_OVERFLOW (value
))
914 TREE_OVERFLOW (value
) = 0;
915 if (skip_evaluation
== 0)
916 warning ("integer overflow in expression");
918 else if ((TREE_CODE (value
) == REAL_CST
919 || (TREE_CODE (value
) == COMPLEX_CST
920 && TREE_CODE (TREE_REALPART (value
)) == REAL_CST
))
921 && TREE_OVERFLOW (value
))
923 TREE_OVERFLOW (value
) = 0;
924 if (skip_evaluation
== 0)
925 warning ("floating point overflow in expression");
927 else if (TREE_CODE (value
) == VECTOR_CST
&& TREE_OVERFLOW (value
))
929 TREE_OVERFLOW (value
) = 0;
930 if (skip_evaluation
== 0)
931 warning ("vector overflow in expression");
935 /* Print a warning if a large constant is truncated to unsigned,
936 or if -Wconversion is used and a constant < 0 is converted to unsigned.
937 Invoke this function on every expression that might be implicitly
938 converted to an unsigned type. */
941 unsigned_conversion_warning (tree result
, tree operand
)
943 tree type
= TREE_TYPE (result
);
945 if (TREE_CODE (operand
) == INTEGER_CST
946 && TREE_CODE (type
) == INTEGER_TYPE
947 && TYPE_UNSIGNED (type
)
948 && skip_evaluation
== 0
949 && !int_fits_type_p (operand
, type
))
951 if (!int_fits_type_p (operand
, c_common_signed_type (type
)))
952 /* This detects cases like converting -129 or 256 to unsigned char. */
953 warning ("large integer implicitly truncated to unsigned type");
954 else if (warn_conversion
)
955 warning ("negative integer implicitly converted to unsigned type");
959 /* Nonzero if constant C has a value that is permissible
960 for type TYPE (an INTEGER_TYPE). */
963 constant_fits_type_p (tree c
, tree type
)
965 if (TREE_CODE (c
) == INTEGER_CST
)
966 return int_fits_type_p (c
, type
);
968 c
= convert (type
, c
);
969 return !TREE_OVERFLOW (c
);
972 /* Nonzero if vector types T1 and T2 can be converted to each other
973 without an explicit cast. */
975 vector_types_convertible_p (tree t1
, tree t2
)
977 return targetm
.vector_opaque_p (t1
)
978 || targetm
.vector_opaque_p (t2
)
979 || (tree_int_cst_equal (TYPE_SIZE (t1
), TYPE_SIZE (t2
))
980 && INTEGRAL_TYPE_P (TREE_TYPE (t1
))
981 == INTEGRAL_TYPE_P (TREE_TYPE (t2
)));
984 /* Convert EXPR to TYPE, warning about conversion problems with constants.
985 Invoke this function on every expression that is converted implicitly,
986 i.e. because of language rules and not because of an explicit cast. */
989 convert_and_check (tree type
, tree expr
)
991 tree t
= convert (type
, expr
);
992 if (TREE_CODE (t
) == INTEGER_CST
)
994 if (TREE_OVERFLOW (t
))
996 TREE_OVERFLOW (t
) = 0;
998 /* Do not diagnose overflow in a constant expression merely
999 because a conversion overflowed. */
1000 TREE_CONSTANT_OVERFLOW (t
) = TREE_CONSTANT_OVERFLOW (expr
);
1002 /* No warning for converting 0x80000000 to int. */
1003 if (!(TYPE_UNSIGNED (type
) < TYPE_UNSIGNED (TREE_TYPE (expr
))
1004 && TREE_CODE (TREE_TYPE (expr
)) == INTEGER_TYPE
1005 && TYPE_PRECISION (type
) == TYPE_PRECISION (TREE_TYPE (expr
))))
1006 /* If EXPR fits in the unsigned version of TYPE,
1007 don't warn unless pedantic. */
1009 || TYPE_UNSIGNED (type
)
1010 || !constant_fits_type_p (expr
,
1011 c_common_unsigned_type (type
)))
1012 && skip_evaluation
== 0)
1013 warning ("overflow in implicit constant conversion");
1016 unsigned_conversion_warning (t
, expr
);
1021 /* A node in a list that describes references to variables (EXPR), which are
1022 either read accesses if WRITER is zero, or write accesses, in which case
1023 WRITER is the parent of EXPR. */
1030 /* Used to implement a cache the results of a call to verify_tree. We only
1031 use this for SAVE_EXPRs. */
1034 struct tlist_cache
*next
;
1035 struct tlist
*cache_before_sp
;
1036 struct tlist
*cache_after_sp
;
1040 /* Obstack to use when allocating tlist structures, and corresponding
1042 static struct obstack tlist_obstack
;
1043 static char *tlist_firstobj
= 0;
1045 /* Keep track of the identifiers we've warned about, so we can avoid duplicate
1047 static struct tlist
*warned_ids
;
1048 /* SAVE_EXPRs need special treatment. We process them only once and then
1049 cache the results. */
1050 static struct tlist_cache
*save_expr_cache
;
1052 static void add_tlist (struct tlist
**, struct tlist
*, tree
, int);
1053 static void merge_tlist (struct tlist
**, struct tlist
*, int);
1054 static void verify_tree (tree
, struct tlist
**, struct tlist
**, tree
);
1055 static int warning_candidate_p (tree
);
1056 static void warn_for_collisions (struct tlist
*);
1057 static void warn_for_collisions_1 (tree
, tree
, struct tlist
*, int);
1058 static struct tlist
*new_tlist (struct tlist
*, tree
, tree
);
1060 /* Create a new struct tlist and fill in its fields. */
1061 static struct tlist
*
1062 new_tlist (struct tlist
*next
, tree t
, tree writer
)
1065 l
= XOBNEW (&tlist_obstack
, struct tlist
);
1072 /* Add duplicates of the nodes found in ADD to the list *TO. If EXCLUDE_WRITER
1073 is nonnull, we ignore any node we find which has a writer equal to it. */
1076 add_tlist (struct tlist
**to
, struct tlist
*add
, tree exclude_writer
, int copy
)
1080 struct tlist
*next
= add
->next
;
1083 if (!exclude_writer
|| add
->writer
!= exclude_writer
)
1084 *to
= copy
? new_tlist (*to
, add
->expr
, add
->writer
) : add
;
1089 /* Merge the nodes of ADD into TO. This merging process is done so that for
1090 each variable that already exists in TO, no new node is added; however if
1091 there is a write access recorded in ADD, and an occurrence on TO is only
1092 a read access, then the occurrence in TO will be modified to record the
1096 merge_tlist (struct tlist
**to
, struct tlist
*add
, int copy
)
1098 struct tlist
**end
= to
;
1101 end
= &(*end
)->next
;
1107 struct tlist
*next
= add
->next
;
1109 for (tmp2
= *to
; tmp2
; tmp2
= tmp2
->next
)
1110 if (tmp2
->expr
== add
->expr
)
1114 tmp2
->writer
= add
->writer
;
1118 *end
= copy
? add
: new_tlist (NULL
, add
->expr
, add
->writer
);
1119 end
= &(*end
)->next
;
1126 /* WRITTEN is a variable, WRITER is its parent. Warn if any of the variable
1127 references in list LIST conflict with it, excluding reads if ONLY writers
1131 warn_for_collisions_1 (tree written
, tree writer
, struct tlist
*list
,
1136 /* Avoid duplicate warnings. */
1137 for (tmp
= warned_ids
; tmp
; tmp
= tmp
->next
)
1138 if (tmp
->expr
== written
)
1143 if (list
->expr
== written
1144 && list
->writer
!= writer
1145 && (!only_writes
|| list
->writer
)
1146 && DECL_NAME (list
->expr
))
1148 warned_ids
= new_tlist (warned_ids
, written
, NULL_TREE
);
1149 warning ("operation on %qE may be undefined", list
->expr
);
1155 /* Given a list LIST of references to variables, find whether any of these
1156 can cause conflicts due to missing sequence points. */
1159 warn_for_collisions (struct tlist
*list
)
1163 for (tmp
= list
; tmp
; tmp
= tmp
->next
)
1166 warn_for_collisions_1 (tmp
->expr
, tmp
->writer
, list
, 0);
1170 /* Return nonzero if X is a tree that can be verified by the sequence point
1173 warning_candidate_p (tree x
)
1175 return TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == PARM_DECL
;
1178 /* Walk the tree X, and record accesses to variables. If X is written by the
1179 parent tree, WRITER is the parent.
1180 We store accesses in one of the two lists: PBEFORE_SP, and PNO_SP. If this
1181 expression or its only operand forces a sequence point, then everything up
1182 to the sequence point is stored in PBEFORE_SP. Everything else gets stored
1184 Once we return, we will have emitted warnings if any subexpression before
1185 such a sequence point could be undefined. On a higher level, however, the
1186 sequence point may not be relevant, and we'll merge the two lists.
1188 Example: (b++, a) + b;
1189 The call that processes the COMPOUND_EXPR will store the increment of B
1190 in PBEFORE_SP, and the use of A in PNO_SP. The higher-level call that
1191 processes the PLUS_EXPR will need to merge the two lists so that
1192 eventually, all accesses end up on the same list (and we'll warn about the
1193 unordered subexpressions b++ and b.
1195 A note on merging. If we modify the former example so that our expression
1198 care must be taken not simply to add all three expressions into the final
1199 PNO_SP list. The function merge_tlist takes care of that by merging the
1200 before-SP list of the COMPOUND_EXPR into its after-SP list in a special
1201 way, so that no more than one access to B is recorded. */
1204 verify_tree (tree x
, struct tlist
**pbefore_sp
, struct tlist
**pno_sp
,
1207 struct tlist
*tmp_before
, *tmp_nosp
, *tmp_list2
, *tmp_list3
;
1208 enum tree_code code
;
1209 enum tree_code_class cl
;
1211 /* X may be NULL if it is the operand of an empty statement expression
1217 code
= TREE_CODE (x
);
1218 cl
= TREE_CODE_CLASS (code
);
1220 if (warning_candidate_p (x
))
1222 *pno_sp
= new_tlist (*pno_sp
, x
, writer
);
1232 case TRUTH_ANDIF_EXPR
:
1233 case TRUTH_ORIF_EXPR
:
1234 tmp_before
= tmp_nosp
= tmp_list3
= 0;
1235 verify_tree (TREE_OPERAND (x
, 0), &tmp_before
, &tmp_nosp
, NULL_TREE
);
1236 warn_for_collisions (tmp_nosp
);
1237 merge_tlist (pbefore_sp
, tmp_before
, 0);
1238 merge_tlist (pbefore_sp
, tmp_nosp
, 0);
1239 verify_tree (TREE_OPERAND (x
, 1), &tmp_list3
, pno_sp
, NULL_TREE
);
1240 merge_tlist (pbefore_sp
, tmp_list3
, 0);
1244 tmp_before
= tmp_list2
= 0;
1245 verify_tree (TREE_OPERAND (x
, 0), &tmp_before
, &tmp_list2
, NULL_TREE
);
1246 warn_for_collisions (tmp_list2
);
1247 merge_tlist (pbefore_sp
, tmp_before
, 0);
1248 merge_tlist (pbefore_sp
, tmp_list2
, 1);
1250 tmp_list3
= tmp_nosp
= 0;
1251 verify_tree (TREE_OPERAND (x
, 1), &tmp_list3
, &tmp_nosp
, NULL_TREE
);
1252 warn_for_collisions (tmp_nosp
);
1253 merge_tlist (pbefore_sp
, tmp_list3
, 0);
1255 tmp_list3
= tmp_list2
= 0;
1256 verify_tree (TREE_OPERAND (x
, 2), &tmp_list3
, &tmp_list2
, NULL_TREE
);
1257 warn_for_collisions (tmp_list2
);
1258 merge_tlist (pbefore_sp
, tmp_list3
, 0);
1259 /* Rather than add both tmp_nosp and tmp_list2, we have to merge the
1260 two first, to avoid warning for (a ? b++ : b++). */
1261 merge_tlist (&tmp_nosp
, tmp_list2
, 0);
1262 add_tlist (pno_sp
, tmp_nosp
, NULL_TREE
, 0);
1265 case PREDECREMENT_EXPR
:
1266 case PREINCREMENT_EXPR
:
1267 case POSTDECREMENT_EXPR
:
1268 case POSTINCREMENT_EXPR
:
1269 verify_tree (TREE_OPERAND (x
, 0), pno_sp
, pno_sp
, x
);
1273 tmp_before
= tmp_nosp
= tmp_list3
= 0;
1274 verify_tree (TREE_OPERAND (x
, 1), &tmp_before
, &tmp_nosp
, NULL_TREE
);
1275 verify_tree (TREE_OPERAND (x
, 0), &tmp_list3
, &tmp_list3
, x
);
1276 /* Expressions inside the LHS are not ordered wrt. the sequence points
1277 in the RHS. Example:
1279 Despite the fact that the modification of "a" is in the before_sp
1280 list (tmp_before), it conflicts with the use of "a" in the LHS.
1281 We can handle this by adding the contents of tmp_list3
1282 to those of tmp_before, and redoing the collision warnings for that
1284 add_tlist (&tmp_before
, tmp_list3
, x
, 1);
1285 warn_for_collisions (tmp_before
);
1286 /* Exclude the LHS itself here; we first have to merge it into the
1287 tmp_nosp list. This is done to avoid warning for "a = a"; if we
1288 didn't exclude the LHS, we'd get it twice, once as a read and once
1290 add_tlist (pno_sp
, tmp_list3
, x
, 0);
1291 warn_for_collisions_1 (TREE_OPERAND (x
, 0), x
, tmp_nosp
, 1);
1293 merge_tlist (pbefore_sp
, tmp_before
, 0);
1294 if (warning_candidate_p (TREE_OPERAND (x
, 0)))
1295 merge_tlist (&tmp_nosp
, new_tlist (NULL
, TREE_OPERAND (x
, 0), x
), 0);
1296 add_tlist (pno_sp
, tmp_nosp
, NULL_TREE
, 1);
1300 /* We need to warn about conflicts among arguments and conflicts between
1301 args and the function address. Side effects of the function address,
1302 however, are not ordered by the sequence point of the call. */
1303 tmp_before
= tmp_nosp
= tmp_list2
= tmp_list3
= 0;
1304 verify_tree (TREE_OPERAND (x
, 0), &tmp_before
, &tmp_nosp
, NULL_TREE
);
1305 if (TREE_OPERAND (x
, 1))
1306 verify_tree (TREE_OPERAND (x
, 1), &tmp_list2
, &tmp_list3
, NULL_TREE
);
1307 merge_tlist (&tmp_list3
, tmp_list2
, 0);
1308 add_tlist (&tmp_before
, tmp_list3
, NULL_TREE
, 0);
1309 add_tlist (&tmp_before
, tmp_nosp
, NULL_TREE
, 0);
1310 warn_for_collisions (tmp_before
);
1311 add_tlist (pbefore_sp
, tmp_before
, NULL_TREE
, 0);
1315 /* Scan all the list, e.g. indices of multi dimensional array. */
1318 tmp_before
= tmp_nosp
= 0;
1319 verify_tree (TREE_VALUE (x
), &tmp_before
, &tmp_nosp
, NULL_TREE
);
1320 merge_tlist (&tmp_nosp
, tmp_before
, 0);
1321 add_tlist (pno_sp
, tmp_nosp
, NULL_TREE
, 0);
1328 struct tlist_cache
*t
;
1329 for (t
= save_expr_cache
; t
; t
= t
->next
)
1335 t
= XOBNEW (&tlist_obstack
, struct tlist_cache
);
1336 t
->next
= save_expr_cache
;
1338 save_expr_cache
= t
;
1340 tmp_before
= tmp_nosp
= 0;
1341 verify_tree (TREE_OPERAND (x
, 0), &tmp_before
, &tmp_nosp
, NULL_TREE
);
1342 warn_for_collisions (tmp_nosp
);
1347 struct tlist
*t
= tmp_nosp
;
1349 merge_tlist (&tmp_list3
, t
, 0);
1351 t
->cache_before_sp
= tmp_before
;
1352 t
->cache_after_sp
= tmp_list3
;
1354 merge_tlist (pbefore_sp
, t
->cache_before_sp
, 1);
1355 add_tlist (pno_sp
, t
->cache_after_sp
, NULL_TREE
, 1);
1360 /* For other expressions, simply recurse on their operands.
1361 Manual tail recursion for unary expressions.
1362 Other non-expressions need not be processed. */
1363 if (cl
== tcc_unary
)
1365 x
= TREE_OPERAND (x
, 0);
1369 else if (IS_EXPR_CODE_CLASS (cl
))
1372 int max
= TREE_CODE_LENGTH (TREE_CODE (x
));
1373 for (lp
= 0; lp
< max
; lp
++)
1375 tmp_before
= tmp_nosp
= 0;
1376 verify_tree (TREE_OPERAND (x
, lp
), &tmp_before
, &tmp_nosp
, 0);
1377 merge_tlist (&tmp_nosp
, tmp_before
, 0);
1378 add_tlist (pno_sp
, tmp_nosp
, NULL_TREE
, 0);
1385 /* Try to warn for undefined behavior in EXPR due to missing sequence
1389 verify_sequence_points (tree expr
)
1391 struct tlist
*before_sp
= 0, *after_sp
= 0;
1394 save_expr_cache
= 0;
1395 if (tlist_firstobj
== 0)
1397 gcc_obstack_init (&tlist_obstack
);
1398 tlist_firstobj
= (char *) obstack_alloc (&tlist_obstack
, 0);
1401 verify_tree (expr
, &before_sp
, &after_sp
, 0);
1402 warn_for_collisions (after_sp
);
1403 obstack_free (&tlist_obstack
, tlist_firstobj
);
1406 /* Validate the expression after `case' and apply default promotions. */
1409 check_case_value (tree value
)
1411 if (value
== NULL_TREE
)
1414 /* ??? Can we ever get nops here for a valid case value? We
1416 STRIP_TYPE_NOPS (value
);
1417 /* In C++, the following is allowed:
1420 switch (...) { case i: ... }
1422 So, we try to reduce the VALUE to a constant that way. */
1423 if (c_dialect_cxx ())
1425 value
= decl_constant_value (value
);
1426 STRIP_TYPE_NOPS (value
);
1427 value
= fold (value
);
1430 if (TREE_CODE (value
) != INTEGER_CST
1431 && value
!= error_mark_node
)
1433 error ("case label does not reduce to an integer constant");
1434 value
= error_mark_node
;
1437 /* Promote char or short to int. */
1438 value
= default_conversion (value
);
1440 constant_expression_warning (value
);
1445 /* See if the case values LOW and HIGH are in the range of the original
1446 type (i.e. before the default conversion to int) of the switch testing
1448 TYPE is the promoted type of the testing expression, and ORIG_TYPE is
1449 the type before promoting it. CASE_LOW_P is a pointer to the lower
1450 bound of the case label, and CASE_HIGH_P is the upper bound or NULL
1451 if the case is not a case range.
1452 The caller has to make sure that we are not called with NULL for
1453 CASE_LOW_P (i.e. the default case).
1454 Returns true if the case label is in range of ORIG_TYPE (satured or
1455 untouched) or false if the label is out of range. */
1458 check_case_bounds (tree type
, tree orig_type
,
1459 tree
*case_low_p
, tree
*case_high_p
)
1461 tree min_value
, max_value
;
1462 tree case_low
= *case_low_p
;
1463 tree case_high
= case_high_p
? *case_high_p
: case_low
;
1465 /* If there was a problem with the original type, do nothing. */
1466 if (orig_type
== error_mark_node
)
1469 min_value
= TYPE_MIN_VALUE (orig_type
);
1470 max_value
= TYPE_MAX_VALUE (orig_type
);
1472 /* Case label is less than minimum for type. */
1473 if (tree_int_cst_compare (case_low
, min_value
) < 0
1474 && tree_int_cst_compare (case_high
, min_value
) < 0)
1476 warning ("case label value is less than minimum value for type");
1480 /* Case value is greater than maximum for type. */
1481 if (tree_int_cst_compare (case_low
, max_value
) > 0
1482 && tree_int_cst_compare (case_high
, max_value
) > 0)
1484 warning ("case label value exceeds maximum value for type");
1488 /* Saturate lower case label value to minimum. */
1489 if (tree_int_cst_compare (case_high
, min_value
) >= 0
1490 && tree_int_cst_compare (case_low
, min_value
) < 0)
1492 warning ("lower value in case label range"
1493 " less than minimum value for type");
1494 case_low
= min_value
;
1497 /* Saturate upper case label value to maximum. */
1498 if (tree_int_cst_compare (case_low
, max_value
) <= 0
1499 && tree_int_cst_compare (case_high
, max_value
) > 0)
1501 warning ("upper value in case label range"
1502 " exceeds maximum value for type");
1503 case_high
= max_value
;
1506 if (*case_low_p
!= case_low
)
1507 *case_low_p
= convert (type
, case_low
);
1508 if (case_high_p
&& *case_high_p
!= case_high
)
1509 *case_high_p
= convert (type
, case_high
);
1514 /* Return an integer type with BITS bits of precision,
1515 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
1518 c_common_type_for_size (unsigned int bits
, int unsignedp
)
1520 if (bits
== TYPE_PRECISION (integer_type_node
))
1521 return unsignedp
? unsigned_type_node
: integer_type_node
;
1523 if (bits
== TYPE_PRECISION (signed_char_type_node
))
1524 return unsignedp
? unsigned_char_type_node
: signed_char_type_node
;
1526 if (bits
== TYPE_PRECISION (short_integer_type_node
))
1527 return unsignedp
? short_unsigned_type_node
: short_integer_type_node
;
1529 if (bits
== TYPE_PRECISION (long_integer_type_node
))
1530 return unsignedp
? long_unsigned_type_node
: long_integer_type_node
;
1532 if (bits
== TYPE_PRECISION (long_long_integer_type_node
))
1533 return (unsignedp
? long_long_unsigned_type_node
1534 : long_long_integer_type_node
);
1536 if (bits
== TYPE_PRECISION (widest_integer_literal_type_node
))
1537 return (unsignedp
? widest_unsigned_literal_type_node
1538 : widest_integer_literal_type_node
);
1540 if (bits
<= TYPE_PRECISION (intQI_type_node
))
1541 return unsignedp
? unsigned_intQI_type_node
: intQI_type_node
;
1543 if (bits
<= TYPE_PRECISION (intHI_type_node
))
1544 return unsignedp
? unsigned_intHI_type_node
: intHI_type_node
;
1546 if (bits
<= TYPE_PRECISION (intSI_type_node
))
1547 return unsignedp
? unsigned_intSI_type_node
: intSI_type_node
;
1549 if (bits
<= TYPE_PRECISION (intDI_type_node
))
1550 return unsignedp
? unsigned_intDI_type_node
: intDI_type_node
;
1555 /* Used for communication between c_common_type_for_mode and
1556 c_register_builtin_type. */
1557 static GTY(()) tree registered_builtin_types
;
1559 /* Return a data type that has machine mode MODE.
1560 If the mode is an integer,
1561 then UNSIGNEDP selects between signed and unsigned types. */
1564 c_common_type_for_mode (enum machine_mode mode
, int unsignedp
)
1568 if (mode
== TYPE_MODE (integer_type_node
))
1569 return unsignedp
? unsigned_type_node
: integer_type_node
;
1571 if (mode
== TYPE_MODE (signed_char_type_node
))
1572 return unsignedp
? unsigned_char_type_node
: signed_char_type_node
;
1574 if (mode
== TYPE_MODE (short_integer_type_node
))
1575 return unsignedp
? short_unsigned_type_node
: short_integer_type_node
;
1577 if (mode
== TYPE_MODE (long_integer_type_node
))
1578 return unsignedp
? long_unsigned_type_node
: long_integer_type_node
;
1580 if (mode
== TYPE_MODE (long_long_integer_type_node
))
1581 return unsignedp
? long_long_unsigned_type_node
: long_long_integer_type_node
;
1583 if (mode
== TYPE_MODE (widest_integer_literal_type_node
))
1584 return unsignedp
? widest_unsigned_literal_type_node
1585 : widest_integer_literal_type_node
;
1588 return unsignedp
? unsigned_intQI_type_node
: intQI_type_node
;
1591 return unsignedp
? unsigned_intHI_type_node
: intHI_type_node
;
1594 return unsignedp
? unsigned_intSI_type_node
: intSI_type_node
;
1597 return unsignedp
? unsigned_intDI_type_node
: intDI_type_node
;
1599 #if HOST_BITS_PER_WIDE_INT >= 64
1600 if (mode
== TYPE_MODE (intTI_type_node
))
1601 return unsignedp
? unsigned_intTI_type_node
: intTI_type_node
;
1604 if (mode
== TYPE_MODE (float_type_node
))
1605 return float_type_node
;
1607 if (mode
== TYPE_MODE (double_type_node
))
1608 return double_type_node
;
1610 if (mode
== TYPE_MODE (long_double_type_node
))
1611 return long_double_type_node
;
1613 if (mode
== TYPE_MODE (void_type_node
))
1614 return void_type_node
;
1616 if (mode
== TYPE_MODE (build_pointer_type (char_type_node
)))
1618 ? make_unsigned_type (GET_MODE_PRECISION (mode
))
1619 : make_signed_type (GET_MODE_PRECISION (mode
)));
1621 if (mode
== TYPE_MODE (build_pointer_type (integer_type_node
)))
1623 ? make_unsigned_type (GET_MODE_PRECISION (mode
))
1624 : make_signed_type (GET_MODE_PRECISION (mode
)));
1626 if (COMPLEX_MODE_P (mode
))
1628 enum machine_mode inner_mode
;
1631 if (mode
== TYPE_MODE (complex_float_type_node
))
1632 return complex_float_type_node
;
1633 if (mode
== TYPE_MODE (complex_double_type_node
))
1634 return complex_double_type_node
;
1635 if (mode
== TYPE_MODE (complex_long_double_type_node
))
1636 return complex_long_double_type_node
;
1638 if (mode
== TYPE_MODE (complex_integer_type_node
) && !unsignedp
)
1639 return complex_integer_type_node
;
1641 inner_mode
= GET_MODE_INNER (mode
);
1642 inner_type
= c_common_type_for_mode (inner_mode
, unsignedp
);
1643 if (inner_type
!= NULL_TREE
)
1644 return build_complex_type (inner_type
);
1646 else if (VECTOR_MODE_P (mode
))
1648 enum machine_mode inner_mode
= GET_MODE_INNER (mode
);
1649 tree inner_type
= c_common_type_for_mode (inner_mode
, unsignedp
);
1650 if (inner_type
!= NULL_TREE
)
1651 return build_vector_type_for_mode (inner_type
, mode
);
1654 for (t
= registered_builtin_types
; t
; t
= TREE_CHAIN (t
))
1655 if (TYPE_MODE (TREE_VALUE (t
)) == mode
)
1656 return TREE_VALUE (t
);
1661 /* Return an unsigned type the same as TYPE in other respects. */
1663 c_common_unsigned_type (tree type
)
1665 tree type1
= TYPE_MAIN_VARIANT (type
);
1666 if (type1
== signed_char_type_node
|| type1
== char_type_node
)
1667 return unsigned_char_type_node
;
1668 if (type1
== integer_type_node
)
1669 return unsigned_type_node
;
1670 if (type1
== short_integer_type_node
)
1671 return short_unsigned_type_node
;
1672 if (type1
== long_integer_type_node
)
1673 return long_unsigned_type_node
;
1674 if (type1
== long_long_integer_type_node
)
1675 return long_long_unsigned_type_node
;
1676 if (type1
== widest_integer_literal_type_node
)
1677 return widest_unsigned_literal_type_node
;
1678 #if HOST_BITS_PER_WIDE_INT >= 64
1679 if (type1
== intTI_type_node
)
1680 return unsigned_intTI_type_node
;
1682 if (type1
== intDI_type_node
)
1683 return unsigned_intDI_type_node
;
1684 if (type1
== intSI_type_node
)
1685 return unsigned_intSI_type_node
;
1686 if (type1
== intHI_type_node
)
1687 return unsigned_intHI_type_node
;
1688 if (type1
== intQI_type_node
)
1689 return unsigned_intQI_type_node
;
1691 return c_common_signed_or_unsigned_type (1, type
);
1694 /* Return a signed type the same as TYPE in other respects. */
1697 c_common_signed_type (tree type
)
1699 tree type1
= TYPE_MAIN_VARIANT (type
);
1700 if (type1
== unsigned_char_type_node
|| type1
== char_type_node
)
1701 return signed_char_type_node
;
1702 if (type1
== unsigned_type_node
)
1703 return integer_type_node
;
1704 if (type1
== short_unsigned_type_node
)
1705 return short_integer_type_node
;
1706 if (type1
== long_unsigned_type_node
)
1707 return long_integer_type_node
;
1708 if (type1
== long_long_unsigned_type_node
)
1709 return long_long_integer_type_node
;
1710 if (type1
== widest_unsigned_literal_type_node
)
1711 return widest_integer_literal_type_node
;
1712 #if HOST_BITS_PER_WIDE_INT >= 64
1713 if (type1
== unsigned_intTI_type_node
)
1714 return intTI_type_node
;
1716 if (type1
== unsigned_intDI_type_node
)
1717 return intDI_type_node
;
1718 if (type1
== unsigned_intSI_type_node
)
1719 return intSI_type_node
;
1720 if (type1
== unsigned_intHI_type_node
)
1721 return intHI_type_node
;
1722 if (type1
== unsigned_intQI_type_node
)
1723 return intQI_type_node
;
1725 return c_common_signed_or_unsigned_type (0, type
);
1728 /* Return a type the same as TYPE except unsigned or
1729 signed according to UNSIGNEDP. */
1732 c_common_signed_or_unsigned_type (int unsignedp
, tree type
)
1734 if (!INTEGRAL_TYPE_P (type
)
1735 || TYPE_UNSIGNED (type
) == unsignedp
)
1738 /* For ENUMERAL_TYPEs in C++, must check the mode of the types, not
1739 the precision; they have precision set to match their range, but
1740 may use a wider mode to match an ABI. If we change modes, we may
1741 wind up with bad conversions. For INTEGER_TYPEs in C, must check
1742 the precision as well, so as to yield correct results for
1743 bit-field types. C++ does not have these separate bit-field
1744 types, and producing a signed or unsigned variant of an
1745 ENUMERAL_TYPE may cause other problems as well. */
1747 #define TYPE_OK(node) \
1748 (TYPE_MODE (type) == TYPE_MODE (node) \
1749 && (c_dialect_cxx () || TYPE_PRECISION (type) == TYPE_PRECISION (node)))
1750 if (TYPE_OK (signed_char_type_node
))
1751 return unsignedp
? unsigned_char_type_node
: signed_char_type_node
;
1752 if (TYPE_OK (integer_type_node
))
1753 return unsignedp
? unsigned_type_node
: integer_type_node
;
1754 if (TYPE_OK (short_integer_type_node
))
1755 return unsignedp
? short_unsigned_type_node
: short_integer_type_node
;
1756 if (TYPE_OK (long_integer_type_node
))
1757 return unsignedp
? long_unsigned_type_node
: long_integer_type_node
;
1758 if (TYPE_OK (long_long_integer_type_node
))
1759 return (unsignedp
? long_long_unsigned_type_node
1760 : long_long_integer_type_node
);
1761 if (TYPE_OK (widest_integer_literal_type_node
))
1762 return (unsignedp
? widest_unsigned_literal_type_node
1763 : widest_integer_literal_type_node
);
1765 #if HOST_BITS_PER_WIDE_INT >= 64
1766 if (TYPE_OK (intTI_type_node
))
1767 return unsignedp
? unsigned_intTI_type_node
: intTI_type_node
;
1769 if (TYPE_OK (intDI_type_node
))
1770 return unsignedp
? unsigned_intDI_type_node
: intDI_type_node
;
1771 if (TYPE_OK (intSI_type_node
))
1772 return unsignedp
? unsigned_intSI_type_node
: intSI_type_node
;
1773 if (TYPE_OK (intHI_type_node
))
1774 return unsignedp
? unsigned_intHI_type_node
: intHI_type_node
;
1775 if (TYPE_OK (intQI_type_node
))
1776 return unsignedp
? unsigned_intQI_type_node
: intQI_type_node
;
1779 if (c_dialect_cxx ())
1782 return build_nonstandard_integer_type (TYPE_PRECISION (type
), unsignedp
);
1785 /* The C version of the register_builtin_type langhook. */
1788 c_register_builtin_type (tree type
, const char* name
)
1792 decl
= build_decl (TYPE_DECL
, get_identifier (name
), type
);
1793 DECL_ARTIFICIAL (decl
) = 1;
1794 if (!TYPE_NAME (type
))
1795 TYPE_NAME (type
) = decl
;
1798 registered_builtin_types
= tree_cons (0, type
, registered_builtin_types
);
1802 /* Return the minimum number of bits needed to represent VALUE in a
1803 signed or unsigned type, UNSIGNEDP says which. */
1806 min_precision (tree value
, int unsignedp
)
1810 /* If the value is negative, compute its negative minus 1. The latter
1811 adjustment is because the absolute value of the largest negative value
1812 is one larger than the largest positive value. This is equivalent to
1813 a bit-wise negation, so use that operation instead. */
1815 if (tree_int_cst_sgn (value
) < 0)
1816 value
= fold (build1 (BIT_NOT_EXPR
, TREE_TYPE (value
), value
));
1818 /* Return the number of bits needed, taking into account the fact
1819 that we need one more bit for a signed than unsigned type. */
1821 if (integer_zerop (value
))
1824 log
= tree_floor_log2 (value
);
1826 return log
+ 1 + !unsignedp
;
1829 /* Print an error message for invalid operands to arith operation
1830 CODE. NOP_EXPR is used as a special case (see
1831 c_common_truthvalue_conversion). */
1834 binary_op_error (enum tree_code code
)
1841 error ("invalid truth-value expression");
1845 opname
= "+"; break;
1847 opname
= "-"; break;
1849 opname
= "*"; break;
1851 opname
= "max"; break;
1853 opname
= "min"; break;
1855 opname
= "=="; break;
1857 opname
= "!="; break;
1859 opname
= "<="; break;
1861 opname
= ">="; break;
1863 opname
= "<"; break;
1865 opname
= ">"; break;
1867 opname
= "<<"; break;
1869 opname
= ">>"; break;
1870 case TRUNC_MOD_EXPR
:
1871 case FLOOR_MOD_EXPR
:
1872 opname
= "%"; break;
1873 case TRUNC_DIV_EXPR
:
1874 case FLOOR_DIV_EXPR
:
1875 opname
= "/"; break;
1877 opname
= "&"; break;
1879 opname
= "|"; break;
1880 case TRUTH_ANDIF_EXPR
:
1881 opname
= "&&"; break;
1882 case TRUTH_ORIF_EXPR
:
1883 opname
= "||"; break;
1885 opname
= "^"; break;
1889 error ("invalid operands to binary %s", opname
);
1892 /* Subroutine of build_binary_op, used for comparison operations.
1893 See if the operands have both been converted from subword integer types
1894 and, if so, perhaps change them both back to their original type.
1895 This function is also responsible for converting the two operands
1896 to the proper common type for comparison.
1898 The arguments of this function are all pointers to local variables
1899 of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1,
1900 RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE.
1902 If this function returns nonzero, it means that the comparison has
1903 a constant value. What this function returns is an expression for
1907 shorten_compare (tree
*op0_ptr
, tree
*op1_ptr
, tree
*restype_ptr
,
1908 enum tree_code
*rescode_ptr
)
1911 tree op0
= *op0_ptr
;
1912 tree op1
= *op1_ptr
;
1913 int unsignedp0
, unsignedp1
;
1915 tree primop0
, primop1
;
1916 enum tree_code code
= *rescode_ptr
;
1918 /* Throw away any conversions to wider types
1919 already present in the operands. */
1921 primop0
= get_narrower (op0
, &unsignedp0
);
1922 primop1
= get_narrower (op1
, &unsignedp1
);
1924 /* Handle the case that OP0 does not *contain* a conversion
1925 but it *requires* conversion to FINAL_TYPE. */
1927 if (op0
== primop0
&& TREE_TYPE (op0
) != *restype_ptr
)
1928 unsignedp0
= TYPE_UNSIGNED (TREE_TYPE (op0
));
1929 if (op1
== primop1
&& TREE_TYPE (op1
) != *restype_ptr
)
1930 unsignedp1
= TYPE_UNSIGNED (TREE_TYPE (op1
));
1932 /* If one of the operands must be floated, we cannot optimize. */
1933 real1
= TREE_CODE (TREE_TYPE (primop0
)) == REAL_TYPE
;
1934 real2
= TREE_CODE (TREE_TYPE (primop1
)) == REAL_TYPE
;
1936 /* If first arg is constant, swap the args (changing operation
1937 so value is preserved), for canonicalization. Don't do this if
1938 the second arg is 0. */
1940 if (TREE_CONSTANT (primop0
)
1941 && !integer_zerop (primop1
) && !real_zerop (primop1
))
1944 int temi
= unsignedp0
;
1952 unsignedp0
= unsignedp1
;
1975 *rescode_ptr
= code
;
1978 /* If comparing an integer against a constant more bits wide,
1979 maybe we can deduce a value of 1 or 0 independent of the data.
1980 Or else truncate the constant now
1981 rather than extend the variable at run time.
1983 This is only interesting if the constant is the wider arg.
1984 Also, it is not safe if the constant is unsigned and the
1985 variable arg is signed, since in this case the variable
1986 would be sign-extended and then regarded as unsigned.
1987 Our technique fails in this case because the lowest/highest
1988 possible unsigned results don't follow naturally from the
1989 lowest/highest possible values of the variable operand.
1990 For just EQ_EXPR and NE_EXPR there is another technique that
1991 could be used: see if the constant can be faithfully represented
1992 in the other operand's type, by truncating it and reextending it
1993 and see if that preserves the constant's value. */
1995 if (!real1
&& !real2
1996 && TREE_CODE (primop1
) == INTEGER_CST
1997 && TYPE_PRECISION (TREE_TYPE (primop0
)) < TYPE_PRECISION (*restype_ptr
))
1999 int min_gt
, max_gt
, min_lt
, max_lt
;
2000 tree maxval
, minval
;
2001 /* 1 if comparison is nominally unsigned. */
2002 int unsignedp
= TYPE_UNSIGNED (*restype_ptr
);
2005 type
= c_common_signed_or_unsigned_type (unsignedp0
,
2006 TREE_TYPE (primop0
));
2008 maxval
= TYPE_MAX_VALUE (type
);
2009 minval
= TYPE_MIN_VALUE (type
);
2011 if (unsignedp
&& !unsignedp0
)
2012 *restype_ptr
= c_common_signed_type (*restype_ptr
);
2014 if (TREE_TYPE (primop1
) != *restype_ptr
)
2016 /* Convert primop1 to target type, but do not introduce
2017 additional overflow. We know primop1 is an int_cst. */
2018 tree tmp
= build_int_cst_wide (*restype_ptr
,
2019 TREE_INT_CST_LOW (primop1
),
2020 TREE_INT_CST_HIGH (primop1
));
2022 primop1
= force_fit_type (tmp
, 0, TREE_OVERFLOW (primop1
),
2023 TREE_CONSTANT_OVERFLOW (primop1
));
2025 if (type
!= *restype_ptr
)
2027 minval
= convert (*restype_ptr
, minval
);
2028 maxval
= convert (*restype_ptr
, maxval
);
2031 if (unsignedp
&& unsignedp0
)
2033 min_gt
= INT_CST_LT_UNSIGNED (primop1
, minval
);
2034 max_gt
= INT_CST_LT_UNSIGNED (primop1
, maxval
);
2035 min_lt
= INT_CST_LT_UNSIGNED (minval
, primop1
);
2036 max_lt
= INT_CST_LT_UNSIGNED (maxval
, primop1
);
2040 min_gt
= INT_CST_LT (primop1
, minval
);
2041 max_gt
= INT_CST_LT (primop1
, maxval
);
2042 min_lt
= INT_CST_LT (minval
, primop1
);
2043 max_lt
= INT_CST_LT (maxval
, primop1
);
2047 /* This used to be a switch, but Genix compiler can't handle that. */
2048 if (code
== NE_EXPR
)
2050 if (max_lt
|| min_gt
)
2051 val
= truthvalue_true_node
;
2053 else if (code
== EQ_EXPR
)
2055 if (max_lt
|| min_gt
)
2056 val
= truthvalue_false_node
;
2058 else if (code
== LT_EXPR
)
2061 val
= truthvalue_true_node
;
2063 val
= truthvalue_false_node
;
2065 else if (code
== GT_EXPR
)
2068 val
= truthvalue_true_node
;
2070 val
= truthvalue_false_node
;
2072 else if (code
== LE_EXPR
)
2075 val
= truthvalue_true_node
;
2077 val
= truthvalue_false_node
;
2079 else if (code
== GE_EXPR
)
2082 val
= truthvalue_true_node
;
2084 val
= truthvalue_false_node
;
2087 /* If primop0 was sign-extended and unsigned comparison specd,
2088 we did a signed comparison above using the signed type bounds.
2089 But the comparison we output must be unsigned.
2091 Also, for inequalities, VAL is no good; but if the signed
2092 comparison had *any* fixed result, it follows that the
2093 unsigned comparison just tests the sign in reverse
2094 (positive values are LE, negative ones GE).
2095 So we can generate an unsigned comparison
2096 against an extreme value of the signed type. */
2098 if (unsignedp
&& !unsignedp0
)
2105 primop1
= TYPE_MIN_VALUE (type
);
2111 primop1
= TYPE_MAX_VALUE (type
);
2118 type
= c_common_unsigned_type (type
);
2121 if (TREE_CODE (primop0
) != INTEGER_CST
)
2123 if (val
== truthvalue_false_node
)
2124 warning ("comparison is always false due to limited range of data type");
2125 if (val
== truthvalue_true_node
)
2126 warning ("comparison is always true due to limited range of data type");
2131 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
2132 if (TREE_SIDE_EFFECTS (primop0
))
2133 return build2 (COMPOUND_EXPR
, TREE_TYPE (val
), primop0
, val
);
2137 /* Value is not predetermined, but do the comparison
2138 in the type of the operand that is not constant.
2139 TYPE is already properly set. */
2141 else if (real1
&& real2
2142 && (TYPE_PRECISION (TREE_TYPE (primop0
))
2143 == TYPE_PRECISION (TREE_TYPE (primop1
))))
2144 type
= TREE_TYPE (primop0
);
2146 /* If args' natural types are both narrower than nominal type
2147 and both extend in the same manner, compare them
2148 in the type of the wider arg.
2149 Otherwise must actually extend both to the nominal
2150 common type lest different ways of extending
2152 (eg, (short)-1 == (unsigned short)-1 should be 0.) */
2154 else if (unsignedp0
== unsignedp1
&& real1
== real2
2155 && TYPE_PRECISION (TREE_TYPE (primop0
)) < TYPE_PRECISION (*restype_ptr
)
2156 && TYPE_PRECISION (TREE_TYPE (primop1
)) < TYPE_PRECISION (*restype_ptr
))
2158 type
= common_type (TREE_TYPE (primop0
), TREE_TYPE (primop1
));
2159 type
= c_common_signed_or_unsigned_type (unsignedp0
2160 || TYPE_UNSIGNED (*restype_ptr
),
2162 /* Make sure shorter operand is extended the right way
2163 to match the longer operand. */
2165 = convert (c_common_signed_or_unsigned_type (unsignedp0
,
2166 TREE_TYPE (primop0
)),
2169 = convert (c_common_signed_or_unsigned_type (unsignedp1
,
2170 TREE_TYPE (primop1
)),
2175 /* Here we must do the comparison on the nominal type
2176 using the args exactly as we received them. */
2177 type
= *restype_ptr
;
2181 if (!real1
&& !real2
&& integer_zerop (primop1
)
2182 && TYPE_UNSIGNED (*restype_ptr
))
2188 /* All unsigned values are >= 0, so we warn if extra warnings
2189 are requested. However, if OP0 is a constant that is
2190 >= 0, the signedness of the comparison isn't an issue,
2191 so suppress the warning. */
2192 if (extra_warnings
&& !in_system_header
2193 && !(TREE_CODE (primop0
) == INTEGER_CST
2194 && !TREE_OVERFLOW (convert (c_common_signed_type (type
),
2196 warning ("comparison of unsigned expression >= 0 is always true");
2197 value
= truthvalue_true_node
;
2201 if (extra_warnings
&& !in_system_header
2202 && !(TREE_CODE (primop0
) == INTEGER_CST
2203 && !TREE_OVERFLOW (convert (c_common_signed_type (type
),
2205 warning ("comparison of unsigned expression < 0 is always false");
2206 value
= truthvalue_false_node
;
2215 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
2216 if (TREE_SIDE_EFFECTS (primop0
))
2217 return build2 (COMPOUND_EXPR
, TREE_TYPE (value
),
2224 *op0_ptr
= convert (type
, primop0
);
2225 *op1_ptr
= convert (type
, primop1
);
2227 *restype_ptr
= truthvalue_type_node
;
2232 /* Return a tree for the sum or difference (RESULTCODE says which)
2233 of pointer PTROP and integer INTOP. */
2236 pointer_int_sum (enum tree_code resultcode
, tree ptrop
, tree intop
)
2240 /* The result is a pointer of the same type that is being added. */
2242 tree result_type
= TREE_TYPE (ptrop
);
2244 if (TREE_CODE (TREE_TYPE (result_type
)) == VOID_TYPE
)
2246 if (pedantic
|| warn_pointer_arith
)
2247 pedwarn ("pointer of type %<void *%> used in arithmetic");
2248 size_exp
= integer_one_node
;
2250 else if (TREE_CODE (TREE_TYPE (result_type
)) == FUNCTION_TYPE
)
2252 if (pedantic
|| warn_pointer_arith
)
2253 pedwarn ("pointer to a function used in arithmetic");
2254 size_exp
= integer_one_node
;
2256 else if (TREE_CODE (TREE_TYPE (result_type
)) == METHOD_TYPE
)
2258 if (pedantic
|| warn_pointer_arith
)
2259 pedwarn ("pointer to member function used in arithmetic");
2260 size_exp
= integer_one_node
;
2263 size_exp
= size_in_bytes (TREE_TYPE (result_type
));
2265 /* If what we are about to multiply by the size of the elements
2266 contains a constant term, apply distributive law
2267 and multiply that constant term separately.
2268 This helps produce common subexpressions. */
2270 if ((TREE_CODE (intop
) == PLUS_EXPR
|| TREE_CODE (intop
) == MINUS_EXPR
)
2271 && !TREE_CONSTANT (intop
)
2272 && TREE_CONSTANT (TREE_OPERAND (intop
, 1))
2273 && TREE_CONSTANT (size_exp
)
2274 /* If the constant comes from pointer subtraction,
2275 skip this optimization--it would cause an error. */
2276 && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop
, 0))) == INTEGER_TYPE
2277 /* If the constant is unsigned, and smaller than the pointer size,
2278 then we must skip this optimization. This is because it could cause
2279 an overflow error if the constant is negative but INTOP is not. */
2280 && (!TYPE_UNSIGNED (TREE_TYPE (intop
))
2281 || (TYPE_PRECISION (TREE_TYPE (intop
))
2282 == TYPE_PRECISION (TREE_TYPE (ptrop
)))))
2284 enum tree_code subcode
= resultcode
;
2285 tree int_type
= TREE_TYPE (intop
);
2286 if (TREE_CODE (intop
) == MINUS_EXPR
)
2287 subcode
= (subcode
== PLUS_EXPR
? MINUS_EXPR
: PLUS_EXPR
);
2288 /* Convert both subexpression types to the type of intop,
2289 because weird cases involving pointer arithmetic
2290 can result in a sum or difference with different type args. */
2291 ptrop
= build_binary_op (subcode
, ptrop
,
2292 convert (int_type
, TREE_OPERAND (intop
, 1)), 1);
2293 intop
= convert (int_type
, TREE_OPERAND (intop
, 0));
2296 /* Convert the integer argument to a type the same size as sizetype
2297 so the multiply won't overflow spuriously. */
2299 if (TYPE_PRECISION (TREE_TYPE (intop
)) != TYPE_PRECISION (sizetype
)
2300 || TYPE_UNSIGNED (TREE_TYPE (intop
)) != TYPE_UNSIGNED (sizetype
))
2301 intop
= convert (c_common_type_for_size (TYPE_PRECISION (sizetype
),
2302 TYPE_UNSIGNED (sizetype
)), intop
);
2304 /* Replace the integer argument with a suitable product by the object size.
2305 Do this multiplication as signed, then convert to the appropriate
2306 pointer type (actually unsigned integral). */
2308 intop
= convert (result_type
,
2309 build_binary_op (MULT_EXPR
, intop
,
2310 convert (TREE_TYPE (intop
), size_exp
), 1));
2312 /* Create the sum or difference. */
2313 return fold (build2 (resultcode
, result_type
, ptrop
, intop
));
2316 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
2317 or validate its data type for an `if' or `while' statement or ?..: exp.
2319 This preparation consists of taking the ordinary
2320 representation of an expression expr and producing a valid tree
2321 boolean expression describing whether expr is nonzero. We could
2322 simply always do build_binary_op (NE_EXPR, expr, truthvalue_false_node, 1),
2323 but we optimize comparisons, &&, ||, and !.
2325 The resulting type should always be `truthvalue_type_node'. */
2328 c_common_truthvalue_conversion (tree expr
)
2330 switch (TREE_CODE (expr
))
2332 case EQ_EXPR
: case NE_EXPR
: case UNEQ_EXPR
: case LTGT_EXPR
:
2333 case LE_EXPR
: case GE_EXPR
: case LT_EXPR
: case GT_EXPR
:
2334 case UNLE_EXPR
: case UNGE_EXPR
: case UNLT_EXPR
: case UNGT_EXPR
:
2335 case ORDERED_EXPR
: case UNORDERED_EXPR
:
2336 if (TREE_TYPE (expr
) == truthvalue_type_node
)
2338 return build2 (TREE_CODE (expr
), truthvalue_type_node
,
2339 TREE_OPERAND (expr
, 0), TREE_OPERAND (expr
, 1));
2341 case TRUTH_ANDIF_EXPR
:
2342 case TRUTH_ORIF_EXPR
:
2343 case TRUTH_AND_EXPR
:
2345 case TRUTH_XOR_EXPR
:
2346 if (TREE_TYPE (expr
) == truthvalue_type_node
)
2348 return build2 (TREE_CODE (expr
), truthvalue_type_node
,
2349 lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 0)),
2350 lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 1)));
2352 case TRUTH_NOT_EXPR
:
2353 if (TREE_TYPE (expr
) == truthvalue_type_node
)
2355 return build1 (TREE_CODE (expr
), truthvalue_type_node
,
2356 lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 0)));
2362 /* Avoid integer_zerop to ignore TREE_CONSTANT_OVERFLOW. */
2363 return (TREE_INT_CST_LOW (expr
) != 0 || TREE_INT_CST_HIGH (expr
) != 0)
2364 ? truthvalue_true_node
2365 : truthvalue_false_node
;
2368 return real_compare (NE_EXPR
, &TREE_REAL_CST (expr
), &dconst0
)
2369 ? truthvalue_true_node
2370 : truthvalue_false_node
;
2373 expr
= build_unary_op (ADDR_EXPR
, expr
, 0);
2378 if (TREE_CODE (TREE_OPERAND (expr
, 0)) == FUNCTION_DECL
2379 && !DECL_WEAK (TREE_OPERAND (expr
, 0)))
2381 /* Common Ada/Pascal programmer's mistake. We always warn
2382 about this since it is so bad. */
2383 warning ("the address of %qD, will always evaluate as %<true%>",
2384 TREE_OPERAND (expr
, 0));
2385 return truthvalue_true_node
;
2388 /* If we are taking the address of an external decl, it might be
2389 zero if it is weak, so we cannot optimize. */
2390 if (DECL_P (TREE_OPERAND (expr
, 0))
2391 && DECL_EXTERNAL (TREE_OPERAND (expr
, 0)))
2394 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr
, 0)))
2395 return build2 (COMPOUND_EXPR
, truthvalue_type_node
,
2396 TREE_OPERAND (expr
, 0), truthvalue_true_node
);
2398 return truthvalue_true_node
;
2402 return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr
, 1))
2403 ? TRUTH_OR_EXPR
: TRUTH_ORIF_EXPR
),
2404 lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 0)),
2405 lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 1)),
2411 /* These don't change whether an object is nonzero or zero. */
2412 return lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 0));
2416 /* These don't change whether an object is zero or nonzero, but
2417 we can't ignore them if their second arg has side-effects. */
2418 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr
, 1)))
2419 return build2 (COMPOUND_EXPR
, truthvalue_type_node
,
2420 TREE_OPERAND (expr
, 1),
2421 lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 0)));
2423 return lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 0));
2426 /* Distribute the conversion into the arms of a COND_EXPR. */
2427 return fold (build3 (COND_EXPR
, truthvalue_type_node
,
2428 TREE_OPERAND (expr
, 0),
2429 lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 1)),
2430 lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 2))));
2433 /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE,
2434 since that affects how `default_conversion' will behave. */
2435 if (TREE_CODE (TREE_TYPE (expr
)) == REFERENCE_TYPE
2436 || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr
, 0))) == REFERENCE_TYPE
)
2438 /* Fall through.... */
2440 /* If this is widening the argument, we can ignore it. */
2441 if (TYPE_PRECISION (TREE_TYPE (expr
))
2442 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr
, 0))))
2443 return lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 0));
2447 /* Perhaps reduce (x - y) != 0 to (x != y). The expressions
2448 aren't guaranteed to the be same for modes that can represent
2449 infinity, since if x and y are both +infinity, or both
2450 -infinity, then x - y is not a number.
2452 Note that this transformation is safe when x or y is NaN.
2453 (x - y) is then NaN, and both (x - y) != 0 and x != y will
2455 if (HONOR_INFINITIES (TYPE_MODE (TREE_TYPE (TREE_OPERAND (expr
, 0)))))
2457 /* Fall through.... */
2459 /* This and MINUS_EXPR can be changed into a comparison of the
2461 if (TREE_TYPE (TREE_OPERAND (expr
, 0))
2462 == TREE_TYPE (TREE_OPERAND (expr
, 1)))
2463 return build_binary_op (NE_EXPR
, TREE_OPERAND (expr
, 0),
2464 TREE_OPERAND (expr
, 1), 1);
2465 return build_binary_op (NE_EXPR
, TREE_OPERAND (expr
, 0),
2466 fold (build1 (NOP_EXPR
,
2467 TREE_TYPE (TREE_OPERAND (expr
, 0)),
2468 TREE_OPERAND (expr
, 1))), 1);
2471 if (integer_onep (TREE_OPERAND (expr
, 1))
2472 && TREE_TYPE (expr
) != truthvalue_type_node
)
2473 /* Using convert here would cause infinite recursion. */
2474 return build1 (NOP_EXPR
, truthvalue_type_node
, expr
);
2478 if (warn_parentheses
&& !TREE_NO_WARNING (expr
))
2479 warning ("suggest parentheses around assignment used as truth value");
2486 if (TREE_CODE (TREE_TYPE (expr
)) == COMPLEX_TYPE
)
2488 tree t
= save_expr (expr
);
2489 return (build_binary_op
2490 ((TREE_SIDE_EFFECTS (expr
)
2491 ? TRUTH_OR_EXPR
: TRUTH_ORIF_EXPR
),
2492 lang_hooks
.truthvalue_conversion (build_unary_op (REALPART_EXPR
, t
, 0)),
2493 lang_hooks
.truthvalue_conversion (build_unary_op (IMAGPART_EXPR
, t
, 0)),
2497 return build_binary_op (NE_EXPR
, expr
, integer_zero_node
, 1);
2500 static tree
builtin_function_2 (const char *builtin_name
, const char *name
,
2501 tree builtin_type
, tree type
,
2502 enum built_in_function function_code
,
2503 enum built_in_class cl
, int library_name_p
,
2507 /* Make a variant type in the proper way for C/C++, propagating qualifiers
2508 down to the element type of an array. */
2511 c_build_qualified_type (tree type
, int type_quals
)
2513 if (type
== error_mark_node
)
2516 if (TREE_CODE (type
) == ARRAY_TYPE
)
2519 tree element_type
= c_build_qualified_type (TREE_TYPE (type
),
2522 /* See if we already have an identically qualified type. */
2523 for (t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
2525 if (TYPE_QUALS (strip_array_types (t
)) == type_quals
2526 && TYPE_NAME (t
) == TYPE_NAME (type
)
2527 && TYPE_CONTEXT (t
) == TYPE_CONTEXT (type
)
2528 && attribute_list_equal (TYPE_ATTRIBUTES (t
),
2529 TYPE_ATTRIBUTES (type
)))
2534 t
= build_variant_type_copy (type
);
2535 TREE_TYPE (t
) = element_type
;
2540 /* A restrict-qualified pointer type must be a pointer to object or
2541 incomplete type. Note that the use of POINTER_TYPE_P also allows
2542 REFERENCE_TYPEs, which is appropriate for C++. */
2543 if ((type_quals
& TYPE_QUAL_RESTRICT
)
2544 && (!POINTER_TYPE_P (type
)
2545 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type
))))
2547 error ("invalid use of %<restrict%>");
2548 type_quals
&= ~TYPE_QUAL_RESTRICT
;
2551 return build_qualified_type (type
, type_quals
);
2554 /* Apply the TYPE_QUALS to the new DECL. */
2557 c_apply_type_quals_to_decl (int type_quals
, tree decl
)
2559 tree type
= TREE_TYPE (decl
);
2561 if (type
== error_mark_node
)
2564 if (((type_quals
& TYPE_QUAL_CONST
)
2565 || (type
&& TREE_CODE (type
) == REFERENCE_TYPE
))
2566 /* An object declared 'const' is only readonly after it is
2567 initialized. We don't have any way of expressing this currently,
2568 so we need to be conservative and unset TREE_READONLY for types
2569 with constructors. Otherwise aliasing code will ignore stores in
2570 an inline constructor. */
2571 && !(type
&& TYPE_NEEDS_CONSTRUCTING (type
)))
2572 TREE_READONLY (decl
) = 1;
2573 if (type_quals
& TYPE_QUAL_VOLATILE
)
2575 TREE_SIDE_EFFECTS (decl
) = 1;
2576 TREE_THIS_VOLATILE (decl
) = 1;
2578 if (type_quals
& TYPE_QUAL_RESTRICT
)
2580 while (type
&& TREE_CODE (type
) == ARRAY_TYPE
)
2581 /* Allow 'restrict' on arrays of pointers.
2582 FIXME currently we just ignore it. */
2583 type
= TREE_TYPE (type
);
2585 || !POINTER_TYPE_P (type
)
2586 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type
)))
2587 error ("invalid use of %<restrict%>");
2588 else if (flag_strict_aliasing
&& type
== TREE_TYPE (decl
))
2589 /* Indicate we need to make a unique alias set for this pointer.
2590 We can't do it here because it might be pointing to an
2592 DECL_POINTER_ALIAS_SET (decl
) = -2;
2596 /* Hash function for the problem of multiple type definitions in
2597 different files. This must hash all types that will compare
2598 equal via comptypes to the same value. In practice it hashes
2599 on some of the simple stuff and leaves the details to comptypes. */
2602 c_type_hash (const void *p
)
2608 switch (TREE_CODE (t
))
2610 /* For pointers, hash on pointee type plus some swizzling. */
2612 return c_type_hash (TREE_TYPE (t
)) ^ 0x3003003;
2613 /* Hash on number of elements and total size. */
2616 t2
= TYPE_VALUES (t
);
2620 t2
= TYPE_FIELDS (t
);
2622 case QUAL_UNION_TYPE
:
2624 t2
= TYPE_FIELDS (t
);
2628 t2
= TYPE_FIELDS (t
);
2633 for (; t2
; t2
= TREE_CHAIN (t2
))
2635 size
= TREE_INT_CST_LOW (TYPE_SIZE (t
));
2636 return ((size
<< 24) | (i
<< shift
));
2639 static GTY((param_is (union tree_node
))) htab_t type_hash_table
;
2641 /* Return the typed-based alias set for T, which may be an expression
2642 or a type. Return -1 if we don't do anything special. */
2645 c_common_get_alias_set (tree t
)
2650 /* Permit type-punning when accessing a union, provided the access
2651 is directly through the union. For example, this code does not
2652 permit taking the address of a union member and then storing
2653 through it. Even the type-punning allowed here is a GCC
2654 extension, albeit a common and useful one; the C standard says
2655 that such accesses have implementation-defined behavior. */
2657 TREE_CODE (u
) == COMPONENT_REF
|| TREE_CODE (u
) == ARRAY_REF
;
2658 u
= TREE_OPERAND (u
, 0))
2659 if (TREE_CODE (u
) == COMPONENT_REF
2660 && TREE_CODE (TREE_TYPE (TREE_OPERAND (u
, 0))) == UNION_TYPE
)
2663 /* That's all the expressions we handle specially. */
2667 /* The C standard guarantees that any object may be accessed via an
2668 lvalue that has character type. */
2669 if (t
== char_type_node
2670 || t
== signed_char_type_node
2671 || t
== unsigned_char_type_node
)
2674 /* If it has the may_alias attribute, it can alias anything. */
2675 if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (t
)))
2678 /* The C standard specifically allows aliasing between signed and
2679 unsigned variants of the same type. We treat the signed
2680 variant as canonical. */
2681 if (TREE_CODE (t
) == INTEGER_TYPE
&& TYPE_UNSIGNED (t
))
2683 tree t1
= c_common_signed_type (t
);
2685 /* t1 == t can happen for boolean nodes which are always unsigned. */
2687 return get_alias_set (t1
);
2689 else if (POINTER_TYPE_P (t
))
2693 /* Unfortunately, there is no canonical form of a pointer type.
2694 In particular, if we have `typedef int I', then `int *', and
2695 `I *' are different types. So, we have to pick a canonical
2696 representative. We do this below.
2698 Technically, this approach is actually more conservative that
2699 it needs to be. In particular, `const int *' and `int *'
2700 should be in different alias sets, according to the C and C++
2701 standard, since their types are not the same, and so,
2702 technically, an `int **' and `const int **' cannot point at
2705 But, the standard is wrong. In particular, this code is
2710 const int* const* cipp = ipp;
2712 And, it doesn't make sense for that to be legal unless you
2713 can dereference IPP and CIPP. So, we ignore cv-qualifiers on
2714 the pointed-to types. This issue has been reported to the
2716 t1
= build_type_no_quals (t
);
2718 return get_alias_set (t1
);
2721 /* Handle the case of multiple type nodes referring to "the same" type,
2722 which occurs with IMA. These share an alias set. FIXME: Currently only
2723 C90 is handled. (In C99 type compatibility is not transitive, which
2724 complicates things mightily. The alias set splay trees can theoretically
2725 represent this, but insertion is tricky when you consider all the
2726 different orders things might arrive in.) */
2728 if (c_language
!= clk_c
|| flag_isoc99
)
2731 /* Save time if there's only one input file. */
2732 if (num_in_fnames
== 1)
2735 /* Pointers need special handling if they point to any type that
2736 needs special handling (below). */
2737 if (TREE_CODE (t
) == POINTER_TYPE
)
2740 /* Find bottom type under any nested POINTERs. */
2741 for (t2
= TREE_TYPE (t
);
2742 TREE_CODE (t2
) == POINTER_TYPE
;
2743 t2
= TREE_TYPE (t2
))
2745 if (TREE_CODE (t2
) != RECORD_TYPE
2746 && TREE_CODE (t2
) != ENUMERAL_TYPE
2747 && TREE_CODE (t2
) != QUAL_UNION_TYPE
2748 && TREE_CODE (t2
) != UNION_TYPE
)
2750 if (TYPE_SIZE (t2
) == 0)
2753 /* These are the only cases that need special handling. */
2754 if (TREE_CODE (t
) != RECORD_TYPE
2755 && TREE_CODE (t
) != ENUMERAL_TYPE
2756 && TREE_CODE (t
) != QUAL_UNION_TYPE
2757 && TREE_CODE (t
) != UNION_TYPE
2758 && TREE_CODE (t
) != POINTER_TYPE
)
2761 if (TYPE_SIZE (t
) == 0)
2764 /* Look up t in hash table. Only one of the compatible types within each
2765 alias set is recorded in the table. */
2766 if (!type_hash_table
)
2767 type_hash_table
= htab_create_ggc (1021, c_type_hash
,
2768 (htab_eq
) lang_hooks
.types_compatible_p
,
2770 slot
= htab_find_slot (type_hash_table
, t
, INSERT
);
2773 TYPE_ALIAS_SET (t
) = TYPE_ALIAS_SET ((tree
)*slot
);
2774 return TYPE_ALIAS_SET ((tree
)*slot
);
2777 /* Our caller will assign and record (in t) a new alias set; all we need
2778 to do is remember t in the hash table. */
2784 /* Compute the value of 'sizeof (TYPE)' or '__alignof__ (TYPE)', where the
2785 second parameter indicates which OPERATOR is being applied. The COMPLAIN
2786 flag controls whether we should diagnose possibly ill-formed
2787 constructs or not. */
2789 c_sizeof_or_alignof_type (tree type
, enum tree_code op
, int complain
)
2791 const char *op_name
;
2793 enum tree_code type_code
= TREE_CODE (type
);
2795 gcc_assert (op
== SIZEOF_EXPR
|| op
== ALIGNOF_EXPR
);
2796 op_name
= op
== SIZEOF_EXPR
? "sizeof" : "__alignof__";
2798 if (type_code
== FUNCTION_TYPE
)
2800 if (op
== SIZEOF_EXPR
)
2802 if (complain
&& (pedantic
|| warn_pointer_arith
))
2803 pedwarn ("invalid application of %<sizeof%> to a function type");
2804 value
= size_one_node
;
2807 value
= size_int (FUNCTION_BOUNDARY
/ BITS_PER_UNIT
);
2809 else if (type_code
== VOID_TYPE
|| type_code
== ERROR_MARK
)
2811 if (type_code
== VOID_TYPE
2812 && complain
&& (pedantic
|| warn_pointer_arith
))
2813 pedwarn ("invalid application of %qs to a void type", op_name
);
2814 value
= size_one_node
;
2816 else if (!COMPLETE_TYPE_P (type
))
2819 error ("invalid application of %qs to incomplete type %qT ",
2821 value
= size_zero_node
;
2825 if (op
== (enum tree_code
) SIZEOF_EXPR
)
2826 /* Convert in case a char is more than one unit. */
2827 value
= size_binop (CEIL_DIV_EXPR
, TYPE_SIZE_UNIT (type
),
2828 size_int (TYPE_PRECISION (char_type_node
)
2831 value
= size_int (TYPE_ALIGN_UNIT (type
));
2834 /* VALUE will have an integer type with TYPE_IS_SIZETYPE set.
2835 TYPE_IS_SIZETYPE means that certain things (like overflow) will
2836 never happen. However, this node should really have type
2837 `size_t', which is just a typedef for an ordinary integer type. */
2838 value
= fold (build1 (NOP_EXPR
, size_type_node
, value
));
2839 gcc_assert (!TYPE_IS_SIZETYPE (TREE_TYPE (value
)));
2844 /* Implement the __alignof keyword: Return the minimum required
2845 alignment of EXPR, measured in bytes. For VAR_DECL's and
2846 FIELD_DECL's return DECL_ALIGN (which can be set from an
2847 "aligned" __attribute__ specification). */
2850 c_alignof_expr (tree expr
)
2854 if (TREE_CODE (expr
) == VAR_DECL
)
2855 t
= size_int (DECL_ALIGN_UNIT (expr
));
2857 else if (TREE_CODE (expr
) == COMPONENT_REF
2858 && DECL_C_BIT_FIELD (TREE_OPERAND (expr
, 1)))
2860 error ("%<__alignof%> applied to a bit-field");
2863 else if (TREE_CODE (expr
) == COMPONENT_REF
2864 && TREE_CODE (TREE_OPERAND (expr
, 1)) == FIELD_DECL
)
2865 t
= size_int (DECL_ALIGN_UNIT (TREE_OPERAND (expr
, 1)));
2867 else if (TREE_CODE (expr
) == INDIRECT_REF
)
2869 tree t
= TREE_OPERAND (expr
, 0);
2871 int bestalign
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t
)));
2873 while (TREE_CODE (t
) == NOP_EXPR
2874 && TREE_CODE (TREE_TYPE (TREE_OPERAND (t
, 0))) == POINTER_TYPE
)
2878 t
= TREE_OPERAND (t
, 0);
2879 thisalign
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t
)));
2880 if (thisalign
> bestalign
)
2881 best
= t
, bestalign
= thisalign
;
2883 return c_alignof (TREE_TYPE (TREE_TYPE (best
)));
2886 return c_alignof (TREE_TYPE (expr
));
2888 return fold (build1 (NOP_EXPR
, size_type_node
, t
));
2891 /* Handle C and C++ default attributes. */
2893 enum built_in_attribute
2895 #define DEF_ATTR_NULL_TREE(ENUM) ENUM,
2896 #define DEF_ATTR_INT(ENUM, VALUE) ENUM,
2897 #define DEF_ATTR_IDENT(ENUM, STRING) ENUM,
2898 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM,
2899 #include "builtin-attrs.def"
2900 #undef DEF_ATTR_NULL_TREE
2902 #undef DEF_ATTR_IDENT
2903 #undef DEF_ATTR_TREE_LIST
2907 static GTY(()) tree built_in_attributes
[(int) ATTR_LAST
];
2909 static void c_init_attributes (void);
2911 /* Build tree nodes and builtin functions common to both C and C++ language
2915 c_common_nodes_and_builtins (void)
2919 #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME,
2920 #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME,
2921 #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME,
2922 #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME,
2923 #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
2924 #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
2925 #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME,
2926 #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME,
2927 #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME,
2928 #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
2929 #define DEF_POINTER_TYPE(NAME, TYPE) NAME,
2930 #include "builtin-types.def"
2931 #undef DEF_PRIMITIVE_TYPE
2932 #undef DEF_FUNCTION_TYPE_0
2933 #undef DEF_FUNCTION_TYPE_1
2934 #undef DEF_FUNCTION_TYPE_2
2935 #undef DEF_FUNCTION_TYPE_3
2936 #undef DEF_FUNCTION_TYPE_4
2937 #undef DEF_FUNCTION_TYPE_VAR_0
2938 #undef DEF_FUNCTION_TYPE_VAR_1
2939 #undef DEF_FUNCTION_TYPE_VAR_2
2940 #undef DEF_FUNCTION_TYPE_VAR_3
2941 #undef DEF_POINTER_TYPE
2945 typedef enum builtin_type builtin_type
;
2947 tree builtin_types
[(int) BT_LAST
];
2948 int wchar_type_size
;
2949 tree array_domain_type
;
2950 tree va_list_ref_type_node
;
2951 tree va_list_arg_type_node
;
2953 /* Define `int' and `char' first so that dbx will output them first. */
2954 record_builtin_type (RID_INT
, NULL
, integer_type_node
);
2955 record_builtin_type (RID_CHAR
, "char", char_type_node
);
2957 /* `signed' is the same as `int'. FIXME: the declarations of "signed",
2958 "unsigned long", "long long unsigned" and "unsigned short" were in C++
2959 but not C. Are the conditionals here needed? */
2960 if (c_dialect_cxx ())
2961 record_builtin_type (RID_SIGNED
, NULL
, integer_type_node
);
2962 record_builtin_type (RID_LONG
, "long int", long_integer_type_node
);
2963 record_builtin_type (RID_UNSIGNED
, "unsigned int", unsigned_type_node
);
2964 record_builtin_type (RID_MAX
, "long unsigned int",
2965 long_unsigned_type_node
);
2966 if (c_dialect_cxx ())
2967 record_builtin_type (RID_MAX
, "unsigned long", long_unsigned_type_node
);
2968 record_builtin_type (RID_MAX
, "long long int",
2969 long_long_integer_type_node
);
2970 record_builtin_type (RID_MAX
, "long long unsigned int",
2971 long_long_unsigned_type_node
);
2972 if (c_dialect_cxx ())
2973 record_builtin_type (RID_MAX
, "long long unsigned",
2974 long_long_unsigned_type_node
);
2975 record_builtin_type (RID_SHORT
, "short int", short_integer_type_node
);
2976 record_builtin_type (RID_MAX
, "short unsigned int",
2977 short_unsigned_type_node
);
2978 if (c_dialect_cxx ())
2979 record_builtin_type (RID_MAX
, "unsigned short",
2980 short_unsigned_type_node
);
2982 /* Define both `signed char' and `unsigned char'. */
2983 record_builtin_type (RID_MAX
, "signed char", signed_char_type_node
);
2984 record_builtin_type (RID_MAX
, "unsigned char", unsigned_char_type_node
);
2986 /* These are types that c_common_type_for_size and
2987 c_common_type_for_mode use. */
2988 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2990 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2992 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2994 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2996 #if HOST_BITS_PER_WIDE_INT >= 64
2997 if (targetm
.scalar_mode_supported_p (TImode
))
2998 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
,
2999 get_identifier ("__int128_t"),
3002 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
3003 unsigned_intQI_type_node
));
3004 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
3005 unsigned_intHI_type_node
));
3006 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
3007 unsigned_intSI_type_node
));
3008 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
3009 unsigned_intDI_type_node
));
3010 #if HOST_BITS_PER_WIDE_INT >= 64
3011 if (targetm
.scalar_mode_supported_p (TImode
))
3012 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
,
3013 get_identifier ("__uint128_t"),
3014 unsigned_intTI_type_node
));
3017 /* Create the widest literal types. */
3018 widest_integer_literal_type_node
3019 = make_signed_type (HOST_BITS_PER_WIDE_INT
* 2);
3020 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
3021 widest_integer_literal_type_node
));
3023 widest_unsigned_literal_type_node
3024 = make_unsigned_type (HOST_BITS_PER_WIDE_INT
* 2);
3025 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
3026 widest_unsigned_literal_type_node
));
3028 /* `unsigned long' is the standard type for sizeof.
3029 Note that stddef.h uses `unsigned long',
3030 and this must agree, even if long and int are the same size. */
3032 TREE_TYPE (identifier_global_value (get_identifier (SIZE_TYPE
)));
3033 signed_size_type_node
= c_common_signed_type (size_type_node
);
3034 set_sizetype (size_type_node
);
3037 TREE_TYPE (identifier_global_value (get_identifier (PID_TYPE
)));
3039 build_common_tree_nodes_2 (flag_short_double
);
3041 record_builtin_type (RID_FLOAT
, NULL
, float_type_node
);
3042 record_builtin_type (RID_DOUBLE
, NULL
, double_type_node
);
3043 record_builtin_type (RID_MAX
, "long double", long_double_type_node
);
3045 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
,
3046 get_identifier ("complex int"),
3047 complex_integer_type_node
));
3048 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
,
3049 get_identifier ("complex float"),
3050 complex_float_type_node
));
3051 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
,
3052 get_identifier ("complex double"),
3053 complex_double_type_node
));
3054 lang_hooks
.decls
.pushdecl
3055 (build_decl (TYPE_DECL
, get_identifier ("complex long double"),
3056 complex_long_double_type_node
));
3058 if (c_dialect_cxx ())
3059 /* For C++, make fileptr_type_node a distinct void * type until
3060 FILE type is defined. */
3061 fileptr_type_node
= build_variant_type_copy (ptr_type_node
);
3063 record_builtin_type (RID_VOID
, NULL
, void_type_node
);
3065 /* This node must not be shared. */
3066 void_zero_node
= make_node (INTEGER_CST
);
3067 TREE_TYPE (void_zero_node
) = void_type_node
;
3069 void_list_node
= build_void_list_node ();
3071 /* Make a type to be the domain of a few array types
3072 whose domains don't really matter.
3073 200 is small enough that it always fits in size_t
3074 and large enough that it can hold most function names for the
3075 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3076 array_domain_type
= build_index_type (size_int (200));
3078 /* Make a type for arrays of characters.
3079 With luck nothing will ever really depend on the length of this
3081 char_array_type_node
3082 = build_array_type (char_type_node
, array_domain_type
);
3084 /* Likewise for arrays of ints. */
3086 = build_array_type (integer_type_node
, array_domain_type
);
3088 string_type_node
= build_pointer_type (char_type_node
);
3089 const_string_type_node
3090 = build_pointer_type (build_qualified_type
3091 (char_type_node
, TYPE_QUAL_CONST
));
3093 /* This is special for C++ so functions can be overloaded. */
3094 wchar_type_node
= get_identifier (MODIFIED_WCHAR_TYPE
);
3095 wchar_type_node
= TREE_TYPE (identifier_global_value (wchar_type_node
));
3096 wchar_type_size
= TYPE_PRECISION (wchar_type_node
);
3097 if (c_dialect_cxx ())
3099 if (TYPE_UNSIGNED (wchar_type_node
))
3100 wchar_type_node
= make_unsigned_type (wchar_type_size
);
3102 wchar_type_node
= make_signed_type (wchar_type_size
);
3103 record_builtin_type (RID_WCHAR
, "wchar_t", wchar_type_node
);
3107 signed_wchar_type_node
= c_common_signed_type (wchar_type_node
);
3108 unsigned_wchar_type_node
= c_common_unsigned_type (wchar_type_node
);
3111 /* This is for wide string constants. */
3112 wchar_array_type_node
3113 = build_array_type (wchar_type_node
, array_domain_type
);
3116 TREE_TYPE (identifier_global_value (get_identifier (WINT_TYPE
)));
3119 TREE_TYPE (identifier_global_value (get_identifier (INTMAX_TYPE
)));
3121 TREE_TYPE (identifier_global_value (get_identifier (UINTMAX_TYPE
)));
3123 default_function_type
= build_function_type (integer_type_node
, NULL_TREE
);
3125 = TREE_TYPE (identifier_global_value (get_identifier (PTRDIFF_TYPE
)));
3126 unsigned_ptrdiff_type_node
= c_common_unsigned_type (ptrdiff_type_node
);
3128 lang_hooks
.decls
.pushdecl
3129 (build_decl (TYPE_DECL
, get_identifier ("__builtin_va_list"),
3130 va_list_type_node
));
3132 if (TREE_CODE (va_list_type_node
) == ARRAY_TYPE
)
3134 va_list_arg_type_node
= va_list_ref_type_node
=
3135 build_pointer_type (TREE_TYPE (va_list_type_node
));
3139 va_list_arg_type_node
= va_list_type_node
;
3140 va_list_ref_type_node
= build_reference_type (va_list_type_node
);
3143 #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \
3144 builtin_types[(int) ENUM] = VALUE;
3145 #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \
3146 builtin_types[(int) ENUM] \
3147 = build_function_type (builtin_types[(int) RETURN], \
3149 #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \
3150 builtin_types[(int) ENUM] \
3151 = build_function_type (builtin_types[(int) RETURN], \
3152 tree_cons (NULL_TREE, \
3153 builtin_types[(int) ARG1], \
3155 #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \
3156 builtin_types[(int) ENUM] \
3157 = build_function_type \
3158 (builtin_types[(int) RETURN], \
3159 tree_cons (NULL_TREE, \
3160 builtin_types[(int) ARG1], \
3161 tree_cons (NULL_TREE, \
3162 builtin_types[(int) ARG2], \
3164 #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
3165 builtin_types[(int) ENUM] \
3166 = build_function_type \
3167 (builtin_types[(int) RETURN], \
3168 tree_cons (NULL_TREE, \
3169 builtin_types[(int) ARG1], \
3170 tree_cons (NULL_TREE, \
3171 builtin_types[(int) ARG2], \
3172 tree_cons (NULL_TREE, \
3173 builtin_types[(int) ARG3], \
3175 #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \
3176 builtin_types[(int) ENUM] \
3177 = build_function_type \
3178 (builtin_types[(int) RETURN], \
3179 tree_cons (NULL_TREE, \
3180 builtin_types[(int) ARG1], \
3181 tree_cons (NULL_TREE, \
3182 builtin_types[(int) ARG2], \
3185 builtin_types[(int) ARG3], \
3186 tree_cons (NULL_TREE, \
3187 builtin_types[(int) ARG4], \
3188 void_list_node)))));
3189 #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \
3190 builtin_types[(int) ENUM] \
3191 = build_function_type (builtin_types[(int) RETURN], NULL_TREE);
3192 #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \
3193 builtin_types[(int) ENUM] \
3194 = build_function_type (builtin_types[(int) RETURN], \
3195 tree_cons (NULL_TREE, \
3196 builtin_types[(int) ARG1], \
3199 #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \
3200 builtin_types[(int) ENUM] \
3201 = build_function_type \
3202 (builtin_types[(int) RETURN], \
3203 tree_cons (NULL_TREE, \
3204 builtin_types[(int) ARG1], \
3205 tree_cons (NULL_TREE, \
3206 builtin_types[(int) ARG2], \
3209 #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
3210 builtin_types[(int) ENUM] \
3211 = build_function_type \
3212 (builtin_types[(int) RETURN], \
3213 tree_cons (NULL_TREE, \
3214 builtin_types[(int) ARG1], \
3215 tree_cons (NULL_TREE, \
3216 builtin_types[(int) ARG2], \
3217 tree_cons (NULL_TREE, \
3218 builtin_types[(int) ARG3], \
3221 #define DEF_POINTER_TYPE(ENUM, TYPE) \
3222 builtin_types[(int) ENUM] \
3223 = build_pointer_type (builtin_types[(int) TYPE]);
3224 #include "builtin-types.def"
3225 #undef DEF_PRIMITIVE_TYPE
3226 #undef DEF_FUNCTION_TYPE_1
3227 #undef DEF_FUNCTION_TYPE_2
3228 #undef DEF_FUNCTION_TYPE_3
3229 #undef DEF_FUNCTION_TYPE_4
3230 #undef DEF_FUNCTION_TYPE_VAR_0
3231 #undef DEF_FUNCTION_TYPE_VAR_1
3232 #undef DEF_FUNCTION_TYPE_VAR_2
3233 #undef DEF_FUNCTION_TYPE_VAR_3
3234 #undef DEF_POINTER_TYPE
3236 c_init_attributes ();
3238 #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, FALLBACK_P, \
3239 NONANSI_P, ATTRS, IMPLICIT, COND) \
3244 gcc_assert (!strncmp (NAME, "__builtin_", \
3245 strlen ("__builtin_"))); \
3248 decl = lang_hooks.builtin_function (NAME, builtin_types[TYPE], \
3252 ? (NAME + strlen ("__builtin_")) \
3254 built_in_attributes[(int) ATTRS]); \
3256 decl = builtin_function_2 (NAME, \
3257 NAME + strlen ("__builtin_"), \
3258 builtin_types[TYPE], \
3259 builtin_types[LIBTYPE], \
3264 built_in_attributes[(int) ATTRS]); \
3266 built_in_decls[(int) ENUM] = decl; \
3268 implicit_built_in_decls[(int) ENUM] = decl; \
3270 #include "builtins.def"
3273 build_common_builtin_nodes ();
3275 targetm
.init_builtins ();
3279 main_identifier_node
= get_identifier ("main");
3282 /* Look up the function in built_in_decls that corresponds to DECL
3283 and set ASMSPEC as its user assembler name. DECL must be a
3284 function decl that declares a builtin. */
3287 set_builtin_user_assembler_name (tree decl
, const char *asmspec
)
3290 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
3291 && DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
3294 builtin
= built_in_decls
[DECL_FUNCTION_CODE (decl
)];
3295 set_user_assembler_name (builtin
, asmspec
);
3296 if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_MEMCPY
)
3297 init_block_move_fn (asmspec
);
3298 else if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_MEMSET
)
3299 init_block_clear_fn (asmspec
);
3303 build_va_arg (tree expr
, tree type
)
3305 return build1 (VA_ARG_EXPR
, type
, expr
);
3309 /* Linked list of disabled built-in functions. */
3311 typedef struct disabled_builtin
3314 struct disabled_builtin
*next
;
3316 static disabled_builtin
*disabled_builtins
= NULL
;
3318 static bool builtin_function_disabled_p (const char *);
3320 /* Disable a built-in function specified by -fno-builtin-NAME. If NAME
3321 begins with "__builtin_", give an error. */
3324 disable_builtin_function (const char *name
)
3326 if (strncmp (name
, "__builtin_", strlen ("__builtin_")) == 0)
3327 error ("cannot disable built-in function %qs", name
);
3330 disabled_builtin
*new_disabled_builtin
= XNEW (disabled_builtin
);
3331 new_disabled_builtin
->name
= name
;
3332 new_disabled_builtin
->next
= disabled_builtins
;
3333 disabled_builtins
= new_disabled_builtin
;
3338 /* Return true if the built-in function NAME has been disabled, false
3342 builtin_function_disabled_p (const char *name
)
3344 disabled_builtin
*p
;
3345 for (p
= disabled_builtins
; p
!= NULL
; p
= p
->next
)
3347 if (strcmp (name
, p
->name
) == 0)
3354 /* Possibly define a builtin function with one or two names. BUILTIN_NAME
3355 is an __builtin_-prefixed name; NAME is the ordinary name; one or both
3356 of these may be NULL (though both being NULL is useless).
3357 BUILTIN_TYPE is the type of the __builtin_-prefixed function;
3358 TYPE is the type of the function with the ordinary name. These
3359 may differ if the ordinary name is declared with a looser type to avoid
3360 conflicts with headers. FUNCTION_CODE and CL are as for
3361 builtin_function. If LIBRARY_NAME_P is nonzero, NAME is passed as
3362 the LIBRARY_NAME parameter to builtin_function when declaring BUILTIN_NAME.
3363 If NONANSI_P is true, the name NAME is treated as a non-ANSI name;
3364 ATTRS is the tree list representing the builtin's function attributes.
3365 Returns the declaration of BUILTIN_NAME, if any, otherwise
3366 the declaration of NAME. Does not declare NAME if flag_no_builtin,
3367 or if NONANSI_P and flag_no_nonansi_builtin. */
3370 builtin_function_2 (const char *builtin_name
, const char *name
,
3371 tree builtin_type
, tree type
,
3372 enum built_in_function function_code
,
3373 enum built_in_class cl
, int library_name_p
,
3374 bool nonansi_p
, tree attrs
)
3376 tree bdecl
= NULL_TREE
;
3377 tree decl
= NULL_TREE
;
3379 if (builtin_name
!= 0)
3380 bdecl
= lang_hooks
.builtin_function (builtin_name
, builtin_type
,
3382 library_name_p
? name
: NULL
, attrs
);
3384 if (name
!= 0 && !flag_no_builtin
&& !builtin_function_disabled_p (name
)
3385 && !(nonansi_p
&& flag_no_nonansi_builtin
))
3386 decl
= lang_hooks
.builtin_function (name
, type
, function_code
, cl
,
3389 return (bdecl
!= 0 ? bdecl
: decl
);
3392 /* Nonzero if the type T promotes to int. This is (nearly) the
3393 integral promotions defined in ISO C99 6.3.1.1/2. */
3396 c_promoting_integer_type_p (tree t
)
3398 switch (TREE_CODE (t
))
3401 return (TYPE_MAIN_VARIANT (t
) == char_type_node
3402 || TYPE_MAIN_VARIANT (t
) == signed_char_type_node
3403 || TYPE_MAIN_VARIANT (t
) == unsigned_char_type_node
3404 || TYPE_MAIN_VARIANT (t
) == short_integer_type_node
3405 || TYPE_MAIN_VARIANT (t
) == short_unsigned_type_node
3406 || TYPE_PRECISION (t
) < TYPE_PRECISION (integer_type_node
));
3409 /* ??? Technically all enumerations not larger than an int
3410 promote to an int. But this is used along code paths
3411 that only want to notice a size change. */
3412 return TYPE_PRECISION (t
) < TYPE_PRECISION (integer_type_node
);
3422 /* Return 1 if PARMS specifies a fixed number of parameters
3423 and none of their types is affected by default promotions. */
3426 self_promoting_args_p (tree parms
)
3429 for (t
= parms
; t
; t
= TREE_CHAIN (t
))
3431 tree type
= TREE_VALUE (t
);
3433 if (TREE_CHAIN (t
) == 0 && type
!= void_type_node
)
3439 if (TYPE_MAIN_VARIANT (type
) == float_type_node
)
3442 if (c_promoting_integer_type_p (type
))
3448 /* Recursively examines the array elements of TYPE, until a non-array
3449 element type is found. */
3452 strip_array_types (tree type
)
3454 while (TREE_CODE (type
) == ARRAY_TYPE
)
3455 type
= TREE_TYPE (type
);
3460 /* Recursively remove any '*' or '&' operator from TYPE. */
3462 strip_pointer_operator (tree t
)
3464 while (POINTER_TYPE_P (t
))
3469 /* Used to compare case labels. K1 and K2 are actually tree nodes
3470 representing case labels, or NULL_TREE for a `default' label.
3471 Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after
3472 K2, and 0 if K1 and K2 are equal. */
3475 case_compare (splay_tree_key k1
, splay_tree_key k2
)
3477 /* Consider a NULL key (such as arises with a `default' label) to be
3478 smaller than anything else. */
3484 return tree_int_cst_compare ((tree
) k1
, (tree
) k2
);
3487 /* Process a case label for the range LOW_VALUE ... HIGH_VALUE. If
3488 LOW_VALUE and HIGH_VALUE are both NULL_TREE then this case label is
3489 actually a `default' label. If only HIGH_VALUE is NULL_TREE, then
3490 case label was declared using the usual C/C++ syntax, rather than
3491 the GNU case range extension. CASES is a tree containing all the
3492 case ranges processed so far; COND is the condition for the
3493 switch-statement itself. Returns the CASE_LABEL_EXPR created, or
3494 ERROR_MARK_NODE if no CASE_LABEL_EXPR is created. */
3497 c_add_case_label (splay_tree cases
, tree cond
, tree orig_type
,
3498 tree low_value
, tree high_value
)
3503 splay_tree_node node
;
3505 /* Create the LABEL_DECL itself. */
3506 label
= create_artificial_label ();
3508 /* If there was an error processing the switch condition, bail now
3509 before we get more confused. */
3510 if (!cond
|| cond
== error_mark_node
)
3513 if ((low_value
&& TREE_TYPE (low_value
)
3514 && POINTER_TYPE_P (TREE_TYPE (low_value
)))
3515 || (high_value
&& TREE_TYPE (high_value
)
3516 && POINTER_TYPE_P (TREE_TYPE (high_value
))))
3517 error ("pointers are not permitted as case values");
3519 /* Case ranges are a GNU extension. */
3520 if (high_value
&& pedantic
)
3521 pedwarn ("range expressions in switch statements are non-standard");
3523 type
= TREE_TYPE (cond
);
3526 low_value
= check_case_value (low_value
);
3527 low_value
= convert_and_check (type
, low_value
);
3531 high_value
= check_case_value (high_value
);
3532 high_value
= convert_and_check (type
, high_value
);
3535 /* If an error has occurred, bail out now. */
3536 if (low_value
== error_mark_node
|| high_value
== error_mark_node
)
3539 /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't
3540 really a case range, even though it was written that way. Remove
3541 the HIGH_VALUE to simplify later processing. */
3542 if (tree_int_cst_equal (low_value
, high_value
))
3543 high_value
= NULL_TREE
;
3544 if (low_value
&& high_value
3545 && !tree_int_cst_lt (low_value
, high_value
))
3546 warning ("empty range specified");
3548 /* See if the case is in range of the type of the original testing
3549 expression. If both low_value and high_value are out of range,
3550 don't insert the case label and return NULL_TREE. */
3552 && !check_case_bounds (type
, orig_type
,
3553 &low_value
, high_value
? &high_value
: NULL
))
3556 /* Look up the LOW_VALUE in the table of case labels we already
3558 node
= splay_tree_lookup (cases
, (splay_tree_key
) low_value
);
3559 /* If there was not an exact match, check for overlapping ranges.
3560 There's no need to do this if there's no LOW_VALUE or HIGH_VALUE;
3561 that's a `default' label and the only overlap is an exact match. */
3562 if (!node
&& (low_value
|| high_value
))
3564 splay_tree_node low_bound
;
3565 splay_tree_node high_bound
;
3567 /* Even though there wasn't an exact match, there might be an
3568 overlap between this case range and another case range.
3569 Since we've (inductively) not allowed any overlapping case
3570 ranges, we simply need to find the greatest low case label
3571 that is smaller that LOW_VALUE, and the smallest low case
3572 label that is greater than LOW_VALUE. If there is an overlap
3573 it will occur in one of these two ranges. */
3574 low_bound
= splay_tree_predecessor (cases
,
3575 (splay_tree_key
) low_value
);
3576 high_bound
= splay_tree_successor (cases
,
3577 (splay_tree_key
) low_value
);
3579 /* Check to see if the LOW_BOUND overlaps. It is smaller than
3580 the LOW_VALUE, so there is no need to check unless the
3581 LOW_BOUND is in fact itself a case range. */
3583 && CASE_HIGH ((tree
) low_bound
->value
)
3584 && tree_int_cst_compare (CASE_HIGH ((tree
) low_bound
->value
),
3587 /* Check to see if the HIGH_BOUND overlaps. The low end of that
3588 range is bigger than the low end of the current range, so we
3589 are only interested if the current range is a real range, and
3590 not an ordinary case label. */
3593 && (tree_int_cst_compare ((tree
) high_bound
->key
,
3598 /* If there was an overlap, issue an error. */
3601 tree duplicate
= CASE_LABEL ((tree
) node
->value
);
3605 error ("duplicate (or overlapping) case value");
3606 error ("%Jthis is the first entry overlapping that value", duplicate
);
3610 error ("duplicate case value") ;
3611 error ("%Jpreviously used here", duplicate
);
3615 error ("multiple default labels in one switch");
3616 error ("%Jthis is the first default label", duplicate
);
3621 /* Add a CASE_LABEL to the statement-tree. */
3622 case_label
= add_stmt (build_case_label (low_value
, high_value
, label
));
3623 /* Register this case label in the splay tree. */
3624 splay_tree_insert (cases
,
3625 (splay_tree_key
) low_value
,
3626 (splay_tree_value
) case_label
);
3631 /* Add a label so that the back-end doesn't think that the beginning of
3632 the switch is unreachable. Note that we do not add a case label, as
3633 that just leads to duplicates and thence to aborts later on. */
3636 tree t
= create_artificial_label ();
3637 add_stmt (build_stmt (LABEL_EXPR
, t
));
3639 return error_mark_node
;
3642 /* Subroutines of c_do_switch_warnings, called via splay_tree_foreach.
3643 Used to verify that case values match up with enumerator values. */
3646 match_case_to_enum_1 (tree key
, tree type
, tree label
)
3648 char buf
[2 + 2*HOST_BITS_PER_WIDE_INT
/4 + 1];
3650 /* ??? Not working too hard to print the double-word value.
3651 Should perhaps be done with %lwd in the diagnostic routines? */
3652 if (TREE_INT_CST_HIGH (key
) == 0)
3653 snprintf (buf
, sizeof (buf
), HOST_WIDE_INT_PRINT_UNSIGNED
,
3654 TREE_INT_CST_LOW (key
));
3655 else if (!TYPE_UNSIGNED (type
)
3656 && TREE_INT_CST_HIGH (key
) == -1
3657 && TREE_INT_CST_LOW (key
) != 0)
3658 snprintf (buf
, sizeof (buf
), "-" HOST_WIDE_INT_PRINT_UNSIGNED
,
3659 -TREE_INT_CST_LOW (key
));
3661 snprintf (buf
, sizeof (buf
), HOST_WIDE_INT_PRINT_DOUBLE_HEX
,
3662 TREE_INT_CST_HIGH (key
), TREE_INT_CST_LOW (key
));
3664 if (TYPE_NAME (type
) == 0)
3665 warning ("%Jcase value %qs not in enumerated type",
3666 CASE_LABEL (label
), buf
);
3668 warning ("%Jcase value %qs not in enumerated type %qT",
3669 CASE_LABEL (label
), buf
, type
);
3673 match_case_to_enum (splay_tree_node node
, void *data
)
3675 tree label
= (tree
) node
->value
;
3676 tree type
= (tree
) data
;
3678 /* Skip default case. */
3679 if (!CASE_LOW (label
))
3682 /* If TREE_ADDRESSABLE is not set, that means CASE_LOW did not appear
3683 when we did our enum->case scan. Reset our scratch bit after. */
3684 if (!TREE_ADDRESSABLE (label
))
3685 match_case_to_enum_1 (CASE_LOW (label
), type
, label
);
3687 TREE_ADDRESSABLE (label
) = 0;
3689 /* If CASE_HIGH is non-null, we have a range. Here we must search.
3690 Note that the old code in stmt.c did not check for the values in
3691 the range either, just the endpoints. */
3692 if (CASE_HIGH (label
))
3694 tree chain
, key
= CASE_HIGH (label
);
3696 for (chain
= TYPE_VALUES (type
);
3697 chain
&& !tree_int_cst_equal (key
, TREE_VALUE (chain
));
3698 chain
= TREE_CHAIN (chain
))
3701 match_case_to_enum_1 (key
, type
, label
);
3707 /* Handle -Wswitch*. Called from the front end after parsing the switch
3709 /* ??? Should probably be somewhere generic, since other languages besides
3710 C and C++ would want this. We'd want to agree on the data structure,
3711 however, which is a problem. Alternately, we operate on gimplified
3712 switch_exprs, which I don't especially like. At the moment, however,
3713 C/C++ are the only tree-ssa languages that support enumerations at all,
3714 so the point is moot. */
3717 c_do_switch_warnings (splay_tree cases
, tree switch_stmt
)
3719 splay_tree_node default_node
;
3720 location_t switch_location
;
3723 if (!warn_switch
&& !warn_switch_enum
&& !warn_switch_default
)
3726 if (EXPR_HAS_LOCATION (switch_stmt
))
3727 switch_location
= EXPR_LOCATION (switch_stmt
);
3729 switch_location
= input_location
;
3731 type
= SWITCH_STMT_TYPE (switch_stmt
);
3733 default_node
= splay_tree_lookup (cases
, (splay_tree_key
) NULL
);
3734 if (warn_switch_default
&& !default_node
)
3735 warning ("%Hswitch missing default case", &switch_location
);
3737 /* If the switch expression was an enumerated type, check that
3738 exactly all enumeration literals are covered by the cases.
3739 The check is made when -Wswitch was specified and there is no
3740 default case, or when -Wswitch-enum was specified. */
3741 if (((warn_switch
&& !default_node
) || warn_switch_enum
)
3742 && type
&& TREE_CODE (type
) == ENUMERAL_TYPE
3743 && TREE_CODE (SWITCH_STMT_COND (switch_stmt
)) != INTEGER_CST
)
3747 /* The time complexity here is O(N*lg(N)) worst case, but for the
3748 common case of monotonically increasing enumerators, it is
3749 O(N), since the nature of the splay tree will keep the next
3750 element adjacent to the root at all times. */
3752 for (chain
= TYPE_VALUES (type
); chain
; chain
= TREE_CHAIN (chain
))
3754 splay_tree_node node
3755 = splay_tree_lookup (cases
, (splay_tree_key
) TREE_VALUE (chain
));
3759 /* Mark the CASE_LOW part of the case entry as seen, so
3760 that we save time later. Choose TREE_ADDRESSABLE
3761 randomly as a bit that won't have been set to-date. */
3762 tree label
= (tree
) node
->value
;
3763 TREE_ADDRESSABLE (label
) = 1;
3767 /* Warn if there are enumerators that don't correspond to
3768 case expressions. */
3769 warning ("%Henumeration value %qE not handled in switch",
3770 &switch_location
, TREE_PURPOSE (chain
));
3774 /* Warn if there are case expressions that don't correspond to
3775 enumerators. This can occur since C and C++ don't enforce
3776 type-checking of assignments to enumeration variables.
3778 The time complexity here is O(N**2) worst case, since we've
3779 not sorted the enumeration values. However, in the absence
3780 of case ranges this is O(N), since all single cases that
3781 corresponded to enumerations have been marked above. */
3783 splay_tree_foreach (cases
, match_case_to_enum
, type
);
3787 /* Finish an expression taking the address of LABEL (an
3788 IDENTIFIER_NODE). Returns an expression for the address. */
3791 finish_label_address_expr (tree label
)
3796 pedwarn ("taking the address of a label is non-standard");
3798 if (label
== error_mark_node
)
3799 return error_mark_node
;
3801 label
= lookup_label (label
);
3802 if (label
== NULL_TREE
)
3803 result
= null_pointer_node
;
3806 TREE_USED (label
) = 1;
3807 result
= build1 (ADDR_EXPR
, ptr_type_node
, label
);
3808 /* The current function in not necessarily uninlinable.
3809 Computed gotos are incompatible with inlining, but the value
3810 here could be used only in a diagnostic, for example. */
3816 /* Hook used by expand_expr to expand language-specific tree codes. */
3817 /* The only things that should go here are bits needed to expand
3818 constant initializers. Everything else should be handled by the
3819 gimplification routines. */
3822 c_expand_expr (tree exp
, rtx target
, enum machine_mode tmode
,
3823 int modifier
/* Actually enum_modifier. */,
3826 switch (TREE_CODE (exp
))
3828 case COMPOUND_LITERAL_EXPR
:
3830 /* Initialize the anonymous variable declared in the compound
3831 literal, then return the variable. */
3832 tree decl
= COMPOUND_LITERAL_EXPR_DECL (exp
);
3833 emit_local_var (decl
);
3834 return expand_expr_real (decl
, target
, tmode
, modifier
, alt_rtl
);
3842 /* Hook used by staticp to handle language-specific tree codes. */
3845 c_staticp (tree exp
)
3847 return (TREE_CODE (exp
) == COMPOUND_LITERAL_EXPR
3848 && TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (exp
))
3853 /* Given a boolean expression ARG, return a tree representing an increment
3854 or decrement (as indicated by CODE) of ARG. The front end must check for
3855 invalid cases (e.g., decrement in C++). */
3857 boolean_increment (enum tree_code code
, tree arg
)
3860 tree true_res
= boolean_true_node
;
3862 arg
= stabilize_reference (arg
);
3865 case PREINCREMENT_EXPR
:
3866 val
= build2 (MODIFY_EXPR
, TREE_TYPE (arg
), arg
, true_res
);
3868 case POSTINCREMENT_EXPR
:
3869 val
= build2 (MODIFY_EXPR
, TREE_TYPE (arg
), arg
, true_res
);
3870 arg
= save_expr (arg
);
3871 val
= build2 (COMPOUND_EXPR
, TREE_TYPE (arg
), val
, arg
);
3872 val
= build2 (COMPOUND_EXPR
, TREE_TYPE (arg
), arg
, val
);
3874 case PREDECREMENT_EXPR
:
3875 val
= build2 (MODIFY_EXPR
, TREE_TYPE (arg
), arg
,
3876 invert_truthvalue (arg
));
3878 case POSTDECREMENT_EXPR
:
3879 val
= build2 (MODIFY_EXPR
, TREE_TYPE (arg
), arg
,
3880 invert_truthvalue (arg
));
3881 arg
= save_expr (arg
);
3882 val
= build2 (COMPOUND_EXPR
, TREE_TYPE (arg
), val
, arg
);
3883 val
= build2 (COMPOUND_EXPR
, TREE_TYPE (arg
), arg
, val
);
3888 TREE_SIDE_EFFECTS (val
) = 1;
3892 /* Built-in macros for stddef.h, that require macros defined in this
3895 c_stddef_cpp_builtins(void)
3897 builtin_define_with_value ("__SIZE_TYPE__", SIZE_TYPE
, 0);
3898 builtin_define_with_value ("__PTRDIFF_TYPE__", PTRDIFF_TYPE
, 0);
3899 builtin_define_with_value ("__WCHAR_TYPE__", MODIFIED_WCHAR_TYPE
, 0);
3900 builtin_define_with_value ("__WINT_TYPE__", WINT_TYPE
, 0);
3901 builtin_define_with_value ("__INTMAX_TYPE__", INTMAX_TYPE
, 0);
3902 builtin_define_with_value ("__UINTMAX_TYPE__", UINTMAX_TYPE
, 0);
3906 c_init_attributes (void)
3908 /* Fill in the built_in_attributes array. */
3909 #define DEF_ATTR_NULL_TREE(ENUM) \
3910 built_in_attributes[(int) ENUM] = NULL_TREE;
3911 #define DEF_ATTR_INT(ENUM, VALUE) \
3912 built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE);
3913 #define DEF_ATTR_IDENT(ENUM, STRING) \
3914 built_in_attributes[(int) ENUM] = get_identifier (STRING);
3915 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \
3916 built_in_attributes[(int) ENUM] \
3917 = tree_cons (built_in_attributes[(int) PURPOSE], \
3918 built_in_attributes[(int) VALUE], \
3919 built_in_attributes[(int) CHAIN]);
3920 #include "builtin-attrs.def"
3921 #undef DEF_ATTR_NULL_TREE
3923 #undef DEF_ATTR_IDENT
3924 #undef DEF_ATTR_TREE_LIST
3927 /* Attribute handlers common to C front ends. */
3929 /* Handle a "packed" attribute; arguments as in
3930 struct attribute_spec.handler. */
3933 handle_packed_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
3934 int flags
, bool *no_add_attrs
)
3938 if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
3939 *node
= build_variant_type_copy (*node
);
3940 TYPE_PACKED (*node
) = 1;
3941 if (TYPE_MAIN_VARIANT (*node
) == *node
)
3943 /* If it is the main variant, then pack the other variants
3944 too. This happens in,
3947 struct Foo const *ptr; // creates a variant w/o packed flag
3948 } __ attribute__((packed)); // packs it now.
3952 for (probe
= *node
; probe
; probe
= TYPE_NEXT_VARIANT (probe
))
3953 TYPE_PACKED (probe
) = 1;
3957 else if (TREE_CODE (*node
) == FIELD_DECL
)
3958 DECL_PACKED (*node
) = 1;
3959 /* We can't set DECL_PACKED for a VAR_DECL, because the bit is
3960 used for DECL_REGISTER. It wouldn't mean anything anyway.
3961 We can't set DECL_PACKED on the type of a TYPE_DECL, because
3962 that changes what the typedef is typing. */
3965 warning ("%qE attribute ignored", name
);
3966 *no_add_attrs
= true;
3972 /* Handle a "nocommon" attribute; arguments as in
3973 struct attribute_spec.handler. */
3976 handle_nocommon_attribute (tree
*node
, tree name
,
3977 tree
ARG_UNUSED (args
),
3978 int ARG_UNUSED (flags
), bool *no_add_attrs
)
3980 if (TREE_CODE (*node
) == VAR_DECL
)
3981 DECL_COMMON (*node
) = 0;
3984 warning ("%qE attribute ignored", name
);
3985 *no_add_attrs
= true;
3991 /* Handle a "common" attribute; arguments as in
3992 struct attribute_spec.handler. */
3995 handle_common_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
3996 int ARG_UNUSED (flags
), bool *no_add_attrs
)
3998 if (TREE_CODE (*node
) == VAR_DECL
)
3999 DECL_COMMON (*node
) = 1;
4002 warning ("%qE attribute ignored", name
);
4003 *no_add_attrs
= true;
4009 /* Handle a "noreturn" attribute; arguments as in
4010 struct attribute_spec.handler. */
4013 handle_noreturn_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
4014 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4016 tree type
= TREE_TYPE (*node
);
4018 /* See FIXME comment in c_common_attribute_table. */
4019 if (TREE_CODE (*node
) == FUNCTION_DECL
)
4020 TREE_THIS_VOLATILE (*node
) = 1;
4021 else if (TREE_CODE (type
) == POINTER_TYPE
4022 && TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
)
4024 = build_pointer_type
4025 (build_type_variant (TREE_TYPE (type
),
4026 TYPE_READONLY (TREE_TYPE (type
)), 1));
4029 warning ("%qE attribute ignored", name
);
4030 *no_add_attrs
= true;
4036 /* Handle a "noinline" attribute; arguments as in
4037 struct attribute_spec.handler. */
4040 handle_noinline_attribute (tree
*node
, tree name
,
4041 tree
ARG_UNUSED (args
),
4042 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4044 if (TREE_CODE (*node
) == FUNCTION_DECL
)
4045 DECL_UNINLINABLE (*node
) = 1;
4048 warning ("%qE attribute ignored", name
);
4049 *no_add_attrs
= true;
4055 /* Handle a "always_inline" attribute; arguments as in
4056 struct attribute_spec.handler. */
4059 handle_always_inline_attribute (tree
*node
, tree name
,
4060 tree
ARG_UNUSED (args
),
4061 int ARG_UNUSED (flags
),
4064 if (TREE_CODE (*node
) == FUNCTION_DECL
)
4066 /* Do nothing else, just set the attribute. We'll get at
4067 it later with lookup_attribute. */
4071 warning ("%qE attribute ignored", name
);
4072 *no_add_attrs
= true;
4078 /* Handle a "used" attribute; arguments as in
4079 struct attribute_spec.handler. */
4082 handle_used_attribute (tree
*pnode
, tree name
, tree
ARG_UNUSED (args
),
4083 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4087 if (TREE_CODE (node
) == FUNCTION_DECL
4088 || (TREE_CODE (node
) == VAR_DECL
&& TREE_STATIC (node
)))
4090 TREE_USED (node
) = 1;
4091 DECL_PRESERVE_P (node
) = 1;
4095 warning ("%qE attribute ignored", name
);
4096 *no_add_attrs
= true;
4102 /* Handle a "unused" attribute; arguments as in
4103 struct attribute_spec.handler. */
4106 handle_unused_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
4107 int flags
, bool *no_add_attrs
)
4113 if (TREE_CODE (decl
) == PARM_DECL
4114 || TREE_CODE (decl
) == VAR_DECL
4115 || TREE_CODE (decl
) == FUNCTION_DECL
4116 || TREE_CODE (decl
) == LABEL_DECL
4117 || TREE_CODE (decl
) == TYPE_DECL
)
4118 TREE_USED (decl
) = 1;
4121 warning ("%qE attribute ignored", name
);
4122 *no_add_attrs
= true;
4127 if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
4128 *node
= build_variant_type_copy (*node
);
4129 TREE_USED (*node
) = 1;
4135 /* Handle a "const" attribute; arguments as in
4136 struct attribute_spec.handler. */
4139 handle_const_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
4140 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4142 tree type
= TREE_TYPE (*node
);
4144 /* See FIXME comment on noreturn in c_common_attribute_table. */
4145 if (TREE_CODE (*node
) == FUNCTION_DECL
)
4146 TREE_READONLY (*node
) = 1;
4147 else if (TREE_CODE (type
) == POINTER_TYPE
4148 && TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
)
4150 = build_pointer_type
4151 (build_type_variant (TREE_TYPE (type
), 1,
4152 TREE_THIS_VOLATILE (TREE_TYPE (type
))));
4155 warning ("%qE attribute ignored", name
);
4156 *no_add_attrs
= true;
4162 /* Handle a "transparent_union" attribute; arguments as in
4163 struct attribute_spec.handler. */
4166 handle_transparent_union_attribute (tree
*node
, tree name
,
4167 tree
ARG_UNUSED (args
), int flags
,
4170 tree decl
= NULL_TREE
;
4177 type
= &TREE_TYPE (decl
);
4178 is_type
= TREE_CODE (*node
) == TYPE_DECL
;
4180 else if (TYPE_P (*node
))
4181 type
= node
, is_type
= 1;
4184 && TREE_CODE (*type
) == UNION_TYPE
4186 || (TYPE_FIELDS (*type
) != 0
4187 && TYPE_MODE (*type
) == DECL_MODE (TYPE_FIELDS (*type
)))))
4189 if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
4190 *type
= build_variant_type_copy (*type
);
4191 TYPE_TRANSPARENT_UNION (*type
) = 1;
4193 else if (decl
!= 0 && TREE_CODE (decl
) == PARM_DECL
4194 && TREE_CODE (*type
) == UNION_TYPE
4195 && TYPE_MODE (*type
) == DECL_MODE (TYPE_FIELDS (*type
)))
4196 DECL_TRANSPARENT_UNION (decl
) = 1;
4199 warning ("%qE attribute ignored", name
);
4200 *no_add_attrs
= true;
4206 /* Handle a "constructor" attribute; arguments as in
4207 struct attribute_spec.handler. */
4210 handle_constructor_attribute (tree
*node
, tree name
,
4211 tree
ARG_UNUSED (args
),
4212 int ARG_UNUSED (flags
),
4216 tree type
= TREE_TYPE (decl
);
4218 if (TREE_CODE (decl
) == FUNCTION_DECL
4219 && TREE_CODE (type
) == FUNCTION_TYPE
4220 && decl_function_context (decl
) == 0)
4222 DECL_STATIC_CONSTRUCTOR (decl
) = 1;
4223 TREE_USED (decl
) = 1;
4227 warning ("%qE attribute ignored", name
);
4228 *no_add_attrs
= true;
4234 /* Handle a "destructor" attribute; arguments as in
4235 struct attribute_spec.handler. */
4238 handle_destructor_attribute (tree
*node
, tree name
,
4239 tree
ARG_UNUSED (args
),
4240 int ARG_UNUSED (flags
),
4244 tree type
= TREE_TYPE (decl
);
4246 if (TREE_CODE (decl
) == FUNCTION_DECL
4247 && TREE_CODE (type
) == FUNCTION_TYPE
4248 && decl_function_context (decl
) == 0)
4250 DECL_STATIC_DESTRUCTOR (decl
) = 1;
4251 TREE_USED (decl
) = 1;
4255 warning ("%qE attribute ignored", name
);
4256 *no_add_attrs
= true;
4262 /* Handle a "mode" attribute; arguments as in
4263 struct attribute_spec.handler. */
4266 handle_mode_attribute (tree
*node
, tree name
, tree args
,
4267 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4271 *no_add_attrs
= true;
4273 if (TREE_CODE (TREE_VALUE (args
)) != IDENTIFIER_NODE
)
4274 warning ("%qE attribute ignored", name
);
4278 const char *p
= IDENTIFIER_POINTER (TREE_VALUE (args
));
4279 int len
= strlen (p
);
4280 enum machine_mode mode
= VOIDmode
;
4284 if (len
> 4 && p
[0] == '_' && p
[1] == '_'
4285 && p
[len
- 1] == '_' && p
[len
- 2] == '_')
4287 char *newp
= (char *) alloca (len
- 1);
4289 strcpy (newp
, &p
[2]);
4290 newp
[len
- 4] = '\0';
4294 /* Change this type to have a type with the specified mode.
4295 First check for the special modes. */
4296 if (!strcmp (p
, "byte"))
4298 else if (!strcmp (p
, "word"))
4300 else if (!strcmp (p
, "pointer"))
4303 for (j
= 0; j
< NUM_MACHINE_MODES
; j
++)
4304 if (!strcmp (p
, GET_MODE_NAME (j
)))
4306 mode
= (enum machine_mode
) j
;
4310 if (mode
== VOIDmode
)
4312 error ("unknown machine mode %qs", p
);
4317 switch (GET_MODE_CLASS (mode
))
4320 case MODE_PARTIAL_INT
:
4322 valid_mode
= targetm
.scalar_mode_supported_p (mode
);
4325 case MODE_COMPLEX_INT
:
4326 case MODE_COMPLEX_FLOAT
:
4327 valid_mode
= targetm
.scalar_mode_supported_p (GET_MODE_INNER (mode
));
4330 case MODE_VECTOR_INT
:
4331 case MODE_VECTOR_FLOAT
:
4332 warning ("specifying vector types with __attribute__ ((mode)) "
4334 warning ("use __attribute__ ((vector_size)) instead");
4335 valid_mode
= vector_mode_valid_p (mode
);
4343 error ("unable to emulate %qs", p
);
4347 if (POINTER_TYPE_P (type
))
4349 tree (*fn
)(tree
, enum machine_mode
, bool);
4351 if (!targetm
.valid_pointer_mode (mode
))
4353 error ("invalid pointer mode %qs", p
);
4357 if (TREE_CODE (type
) == POINTER_TYPE
)
4358 fn
= build_pointer_type_for_mode
;
4360 fn
= build_reference_type_for_mode
;
4361 typefm
= fn (TREE_TYPE (type
), mode
, false);
4364 typefm
= lang_hooks
.types
.type_for_mode (mode
, TYPE_UNSIGNED (type
));
4366 if (typefm
== NULL_TREE
)
4368 error ("no data type for mode %qs", p
);
4371 else if (TREE_CODE (type
) == ENUMERAL_TYPE
)
4373 /* For enumeral types, copy the precision from the integer
4374 type returned above. If not an INTEGER_TYPE, we can't use
4375 this mode for this type. */
4376 if (TREE_CODE (typefm
) != INTEGER_TYPE
)
4378 error ("cannot use mode %qs for enumeral types", p
);
4382 if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
4383 type
= build_variant_type_copy (type
);
4385 /* We cannot use layout_type here, because that will attempt
4386 to re-layout all variants, corrupting our original. */
4387 TYPE_PRECISION (type
) = TYPE_PRECISION (typefm
);
4388 TYPE_MIN_VALUE (type
) = TYPE_MIN_VALUE (typefm
);
4389 TYPE_MAX_VALUE (type
) = TYPE_MAX_VALUE (typefm
);
4390 TYPE_SIZE (type
) = TYPE_SIZE (typefm
);
4391 TYPE_SIZE_UNIT (type
) = TYPE_SIZE_UNIT (typefm
);
4392 TYPE_MODE (type
) = TYPE_MODE (typefm
);
4393 if (!TYPE_USER_ALIGN (type
))
4394 TYPE_ALIGN (type
) = TYPE_ALIGN (typefm
);
4398 else if (VECTOR_MODE_P (mode
)
4399 ? TREE_CODE (type
) != TREE_CODE (TREE_TYPE (typefm
))
4400 : TREE_CODE (type
) != TREE_CODE (typefm
))
4402 error ("mode %qs applied to inappropriate type", p
);
4412 /* Handle a "section" attribute; arguments as in
4413 struct attribute_spec.handler. */
4416 handle_section_attribute (tree
*node
, tree
ARG_UNUSED (name
), tree args
,
4417 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4421 if (targetm
.have_named_sections
)
4423 user_defined_section_attribute
= true;
4425 if ((TREE_CODE (decl
) == FUNCTION_DECL
4426 || TREE_CODE (decl
) == VAR_DECL
)
4427 && TREE_CODE (TREE_VALUE (args
)) == STRING_CST
)
4429 if (TREE_CODE (decl
) == VAR_DECL
4430 && current_function_decl
!= NULL_TREE
4431 && !TREE_STATIC (decl
))
4433 error ("%Jsection attribute cannot be specified for "
4434 "local variables", decl
);
4435 *no_add_attrs
= true;
4438 /* The decl may have already been given a section attribute
4439 from a previous declaration. Ensure they match. */
4440 else if (DECL_SECTION_NAME (decl
) != NULL_TREE
4441 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl
)),
4442 TREE_STRING_POINTER (TREE_VALUE (args
))) != 0)
4444 error ("%Jsection of %qD conflicts with previous declaration",
4446 *no_add_attrs
= true;
4449 DECL_SECTION_NAME (decl
) = TREE_VALUE (args
);
4453 error ("%Jsection attribute not allowed for %qD", *node
, *node
);
4454 *no_add_attrs
= true;
4459 error ("%Jsection attributes are not supported for this target", *node
);
4460 *no_add_attrs
= true;
4466 /* Handle a "aligned" attribute; arguments as in
4467 struct attribute_spec.handler. */
4470 handle_aligned_attribute (tree
*node
, tree
ARG_UNUSED (name
), tree args
,
4471 int flags
, bool *no_add_attrs
)
4473 tree decl
= NULL_TREE
;
4476 tree align_expr
= (args
? TREE_VALUE (args
)
4477 : size_int (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
4483 type
= &TREE_TYPE (decl
);
4484 is_type
= TREE_CODE (*node
) == TYPE_DECL
;
4486 else if (TYPE_P (*node
))
4487 type
= node
, is_type
= 1;
4489 if (TREE_CODE (align_expr
) != INTEGER_CST
)
4491 error ("requested alignment is not a constant");
4492 *no_add_attrs
= true;
4494 else if ((i
= tree_log2 (align_expr
)) == -1)
4496 error ("requested alignment is not a power of 2");
4497 *no_add_attrs
= true;
4499 else if (i
> HOST_BITS_PER_INT
- 2)
4501 error ("requested alignment is too large");
4502 *no_add_attrs
= true;
4506 /* If we have a TYPE_DECL, then copy the type, so that we
4507 don't accidentally modify a builtin type. See pushdecl. */
4508 if (decl
&& TREE_TYPE (decl
) != error_mark_node
4509 && DECL_ORIGINAL_TYPE (decl
) == NULL_TREE
)
4511 tree tt
= TREE_TYPE (decl
);
4512 *type
= build_variant_type_copy (*type
);
4513 DECL_ORIGINAL_TYPE (decl
) = tt
;
4514 TYPE_NAME (*type
) = decl
;
4515 TREE_USED (*type
) = TREE_USED (decl
);
4516 TREE_TYPE (decl
) = *type
;
4518 else if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
4519 *type
= build_variant_type_copy (*type
);
4521 TYPE_ALIGN (*type
) = (1 << i
) * BITS_PER_UNIT
;
4522 TYPE_USER_ALIGN (*type
) = 1;
4524 else if (TREE_CODE (decl
) != VAR_DECL
4525 && TREE_CODE (decl
) != FIELD_DECL
)
4527 error ("%Jalignment may not be specified for %qD", decl
, decl
);
4528 *no_add_attrs
= true;
4532 DECL_ALIGN (decl
) = (1 << i
) * BITS_PER_UNIT
;
4533 DECL_USER_ALIGN (decl
) = 1;
4539 /* Handle a "weak" attribute; arguments as in
4540 struct attribute_spec.handler. */
4543 handle_weak_attribute (tree
*node
, tree
ARG_UNUSED (name
),
4544 tree
ARG_UNUSED (args
),
4545 int ARG_UNUSED (flags
),
4546 bool * ARG_UNUSED (no_add_attrs
))
4548 declare_weak (*node
);
4553 /* Handle an "alias" attribute; arguments as in
4554 struct attribute_spec.handler. */
4557 handle_alias_attribute (tree
*node
, tree name
, tree args
,
4558 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4562 if ((TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_INITIAL (decl
))
4563 || (TREE_CODE (decl
) != FUNCTION_DECL
&& !DECL_EXTERNAL (decl
)))
4565 error ("%J%qD defined both normally and as an alias", decl
, decl
);
4566 *no_add_attrs
= true;
4569 /* Note that the very first time we process a nested declaration,
4570 decl_function_context will not be set. Indeed, *would* never
4571 be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that
4572 we do below. After such frobbery, pushdecl would set the context.
4573 In any case, this is never what we want. */
4574 else if (decl_function_context (decl
) == 0 && current_function_decl
== NULL
)
4578 id
= TREE_VALUE (args
);
4579 if (TREE_CODE (id
) != STRING_CST
)
4581 error ("alias argument not a string");
4582 *no_add_attrs
= true;
4585 id
= get_identifier (TREE_STRING_POINTER (id
));
4586 /* This counts as a use of the object pointed to. */
4589 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4590 DECL_INITIAL (decl
) = error_mark_node
;
4593 DECL_EXTERNAL (decl
) = 0;
4594 TREE_STATIC (decl
) = 1;
4599 warning ("%qE attribute ignored", name
);
4600 *no_add_attrs
= true;
4606 /* Handle an "visibility" attribute; arguments as in
4607 struct attribute_spec.handler. */
4610 handle_visibility_attribute (tree
*node
, tree name
, tree args
,
4611 int ARG_UNUSED (flags
),
4615 tree id
= TREE_VALUE (args
);
4617 *no_add_attrs
= true;
4621 if (TREE_CODE (*node
) != RECORD_TYPE
&& TREE_CODE (*node
) != UNION_TYPE
)
4623 warning ("%qE attribute ignored on non-class types", name
);
4627 else if (decl_function_context (decl
) != 0 || !TREE_PUBLIC (decl
))
4629 warning ("%qE attribute ignored", name
);
4633 if (TREE_CODE (id
) != STRING_CST
)
4635 error ("visibility argument not a string");
4639 /* If this is a type, set the visibility on the type decl. */
4642 decl
= TYPE_NAME (decl
);
4645 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
4647 warning ("%qE attribute ignored on types",
4653 if (strcmp (TREE_STRING_POINTER (id
), "default") == 0)
4654 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4655 else if (strcmp (TREE_STRING_POINTER (id
), "internal") == 0)
4656 DECL_VISIBILITY (decl
) = VISIBILITY_INTERNAL
;
4657 else if (strcmp (TREE_STRING_POINTER (id
), "hidden") == 0)
4658 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
4659 else if (strcmp (TREE_STRING_POINTER (id
), "protected") == 0)
4660 DECL_VISIBILITY (decl
) = VISIBILITY_PROTECTED
;
4662 error ("visibility argument must be one of \"default\", \"hidden\", \"protected\" or \"internal\"");
4663 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4665 /* For decls only, go ahead and attach the attribute to the node as well.
4666 This is needed so we can determine whether we have VISIBILITY_DEFAULT
4667 because the visibility was not specified, or because it was explicitly
4668 overridden from the class visibility. */
4670 *no_add_attrs
= false;
4675 /* Determine the ELF symbol visibility for DECL, which is either a
4676 variable or a function. It is an error to use this function if a
4677 definition of DECL is not available in this translation unit.
4678 Returns true if the final visibility has been determined by this
4679 function; false if the caller is free to make additional
4683 c_determine_visibility (tree decl
)
4685 gcc_assert (TREE_CODE (decl
) == VAR_DECL
4686 || TREE_CODE (decl
) == FUNCTION_DECL
);
4688 /* If the user explicitly specified the visibility with an
4689 attribute, honor that. DECL_VISIBILITY will have been set during
4690 the processing of the attribute. We check for an explicit
4691 attribute, rather than just checking DECL_VISIBILITY_SPECIFIED,
4692 to distinguish the use of an attribute from the use of a "#pragma
4693 GCC visibility push(...)"; in the latter case we still want other
4694 considerations to be able to overrule the #pragma. */
4695 if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl
)))
4698 /* Anything that is exported must have default visibility. */
4699 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
4700 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl
)))
4702 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4703 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4710 /* Handle an "tls_model" attribute; arguments as in
4711 struct attribute_spec.handler. */
4714 handle_tls_model_attribute (tree
*node
, tree name
, tree args
,
4715 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4719 if (!DECL_THREAD_LOCAL (decl
))
4721 warning ("%qE attribute ignored", name
);
4722 *no_add_attrs
= true;
4728 id
= TREE_VALUE (args
);
4729 if (TREE_CODE (id
) != STRING_CST
)
4731 error ("tls_model argument not a string");
4732 *no_add_attrs
= true;
4735 if (strcmp (TREE_STRING_POINTER (id
), "local-exec")
4736 && strcmp (TREE_STRING_POINTER (id
), "initial-exec")
4737 && strcmp (TREE_STRING_POINTER (id
), "local-dynamic")
4738 && strcmp (TREE_STRING_POINTER (id
), "global-dynamic"))
4740 error ("tls_model argument must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\"");
4741 *no_add_attrs
= true;
4749 /* Handle a "no_instrument_function" attribute; arguments as in
4750 struct attribute_spec.handler. */
4753 handle_no_instrument_function_attribute (tree
*node
, tree name
,
4754 tree
ARG_UNUSED (args
),
4755 int ARG_UNUSED (flags
),
4760 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4762 error ("%J%qE attribute applies only to functions", decl
, name
);
4763 *no_add_attrs
= true;
4765 else if (DECL_INITIAL (decl
))
4767 error ("%Jcan%'t set %qE attribute after definition", decl
, name
);
4768 *no_add_attrs
= true;
4771 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl
) = 1;
4776 /* Handle a "malloc" attribute; arguments as in
4777 struct attribute_spec.handler. */
4780 handle_malloc_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
4781 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4783 if (TREE_CODE (*node
) == FUNCTION_DECL
)
4784 DECL_IS_MALLOC (*node
) = 1;
4785 /* ??? TODO: Support types. */
4788 warning ("%qE attribute ignored", name
);
4789 *no_add_attrs
= true;
4795 /* Handle a "returns_twice" attribute; arguments as in
4796 struct attribute_spec.handler. */
4799 handle_returns_twice_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
4800 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4802 if (TREE_CODE (*node
) == FUNCTION_DECL
)
4803 DECL_IS_RETURNS_TWICE (*node
) = 1;
4806 warning ("%qE attribute ignored", name
);
4807 *no_add_attrs
= true;
4813 /* Handle a "no_limit_stack" attribute; arguments as in
4814 struct attribute_spec.handler. */
4817 handle_no_limit_stack_attribute (tree
*node
, tree name
,
4818 tree
ARG_UNUSED (args
),
4819 int ARG_UNUSED (flags
),
4824 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4826 error ("%J%qE attribute applies only to functions", decl
, name
);
4827 *no_add_attrs
= true;
4829 else if (DECL_INITIAL (decl
))
4831 error ("%Jcan%'t set %qE attribute after definition", decl
, name
);
4832 *no_add_attrs
= true;
4835 DECL_NO_LIMIT_STACK (decl
) = 1;
4840 /* Handle a "pure" attribute; arguments as in
4841 struct attribute_spec.handler. */
4844 handle_pure_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
4845 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4847 if (TREE_CODE (*node
) == FUNCTION_DECL
)
4848 DECL_IS_PURE (*node
) = 1;
4849 /* ??? TODO: Support types. */
4852 warning ("%qE attribute ignored", name
);
4853 *no_add_attrs
= true;
4859 /* Handle a "no vops" attribute; arguments as in
4860 struct attribute_spec.handler. */
4863 handle_novops_attribute (tree
*node
, tree
ARG_UNUSED (name
),
4864 tree
ARG_UNUSED (args
), int ARG_UNUSED (flags
),
4865 bool *ARG_UNUSED (no_add_attrs
))
4867 gcc_assert (TREE_CODE (*node
) == FUNCTION_DECL
);
4868 DECL_IS_NOVOPS (*node
) = 1;
4872 /* Handle a "deprecated" attribute; arguments as in
4873 struct attribute_spec.handler. */
4876 handle_deprecated_attribute (tree
*node
, tree name
,
4877 tree
ARG_UNUSED (args
), int flags
,
4880 tree type
= NULL_TREE
;
4882 tree what
= NULL_TREE
;
4887 type
= TREE_TYPE (decl
);
4889 if (TREE_CODE (decl
) == TYPE_DECL
4890 || TREE_CODE (decl
) == PARM_DECL
4891 || TREE_CODE (decl
) == VAR_DECL
4892 || TREE_CODE (decl
) == FUNCTION_DECL
4893 || TREE_CODE (decl
) == FIELD_DECL
)
4894 TREE_DEPRECATED (decl
) = 1;
4898 else if (TYPE_P (*node
))
4900 if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
4901 *node
= build_variant_type_copy (*node
);
4902 TREE_DEPRECATED (*node
) = 1;
4910 *no_add_attrs
= true;
4911 if (type
&& TYPE_NAME (type
))
4913 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
4914 what
= TYPE_NAME (*node
);
4915 else if (TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
4916 && DECL_NAME (TYPE_NAME (type
)))
4917 what
= DECL_NAME (TYPE_NAME (type
));
4920 warning ("%qE attribute ignored for %qE", name
, what
);
4922 warning ("%qE attribute ignored", name
);
4928 /* Handle a "vector_size" attribute; arguments as in
4929 struct attribute_spec.handler. */
4932 handle_vector_size_attribute (tree
*node
, tree name
, tree args
,
4933 int ARG_UNUSED (flags
),
4936 unsigned HOST_WIDE_INT vecsize
, nunits
;
4937 enum machine_mode orig_mode
;
4938 tree type
= *node
, new_type
, size
;
4940 *no_add_attrs
= true;
4942 size
= TREE_VALUE (args
);
4944 if (!host_integerp (size
, 1))
4946 warning ("%qE attribute ignored", name
);
4950 /* Get the vector size (in bytes). */
4951 vecsize
= tree_low_cst (size
, 1);
4953 /* We need to provide for vector pointers, vector arrays, and
4954 functions returning vectors. For example:
4956 __attribute__((vector_size(16))) short *foo;
4958 In this case, the mode is SI, but the type being modified is
4959 HI, so we need to look further. */
4961 while (POINTER_TYPE_P (type
)
4962 || TREE_CODE (type
) == FUNCTION_TYPE
4963 || TREE_CODE (type
) == METHOD_TYPE
4964 || TREE_CODE (type
) == ARRAY_TYPE
)
4965 type
= TREE_TYPE (type
);
4967 /* Get the mode of the type being modified. */
4968 orig_mode
= TYPE_MODE (type
);
4970 if (TREE_CODE (type
) == RECORD_TYPE
4971 || (GET_MODE_CLASS (orig_mode
) != MODE_FLOAT
4972 && GET_MODE_CLASS (orig_mode
) != MODE_INT
)
4973 || !host_integerp (TYPE_SIZE_UNIT (type
), 1))
4975 error ("invalid vector type for attribute %qE", name
);
4979 /* Calculate how many units fit in the vector. */
4980 nunits
= vecsize
/ tree_low_cst (TYPE_SIZE_UNIT (type
), 1);
4981 if (nunits
& (nunits
- 1))
4983 error ("number of components of the vector not a power of two");
4987 new_type
= build_vector_type (type
, nunits
);
4989 /* Build back pointers if needed. */
4990 *node
= reconstruct_complex_type (*node
, new_type
);
4995 /* Handle the "nonnull" attribute. */
4997 handle_nonnull_attribute (tree
*node
, tree
ARG_UNUSED (name
),
4998 tree args
, int ARG_UNUSED (flags
),
5002 unsigned HOST_WIDE_INT attr_arg_num
;
5004 /* If no arguments are specified, all pointer arguments should be
5005 non-null. Verify a full prototype is given so that the arguments
5006 will have the correct types when we actually check them later. */
5009 if (!TYPE_ARG_TYPES (type
))
5011 error ("nonnull attribute without arguments on a non-prototype");
5012 *no_add_attrs
= true;
5017 /* Argument list specified. Verify that each argument number references
5018 a pointer argument. */
5019 for (attr_arg_num
= 1; args
; args
= TREE_CHAIN (args
))
5022 unsigned HOST_WIDE_INT arg_num
= 0, ck_num
;
5024 if (!get_nonnull_operand (TREE_VALUE (args
), &arg_num
))
5026 error ("nonnull argument has invalid operand number (argument %lu)",
5027 (unsigned long) attr_arg_num
);
5028 *no_add_attrs
= true;
5032 argument
= TYPE_ARG_TYPES (type
);
5035 for (ck_num
= 1; ; ck_num
++)
5037 if (!argument
|| ck_num
== arg_num
)
5039 argument
= TREE_CHAIN (argument
);
5043 || TREE_CODE (TREE_VALUE (argument
)) == VOID_TYPE
)
5045 error ("nonnull argument with out-of-range operand number (argument %lu, operand %lu)",
5046 (unsigned long) attr_arg_num
, (unsigned long) arg_num
);
5047 *no_add_attrs
= true;
5051 if (TREE_CODE (TREE_VALUE (argument
)) != POINTER_TYPE
)
5053 error ("nonnull argument references non-pointer operand (argument %lu, operand %lu)",
5054 (unsigned long) attr_arg_num
, (unsigned long) arg_num
);
5055 *no_add_attrs
= true;
5064 /* Check the argument list of a function call for null in argument slots
5065 that are marked as requiring a non-null pointer argument. */
5068 check_function_nonnull (tree attrs
, tree params
)
5070 tree a
, args
, param
;
5073 for (a
= attrs
; a
; a
= TREE_CHAIN (a
))
5075 if (is_attribute_p ("nonnull", TREE_PURPOSE (a
)))
5077 args
= TREE_VALUE (a
);
5079 /* Walk the argument list. If we encounter an argument number we
5080 should check for non-null, do it. If the attribute has no args,
5081 then every pointer argument is checked (in which case the check
5082 for pointer type is done in check_nonnull_arg). */
5083 for (param
= params
, param_num
= 1; ;
5084 param_num
++, param
= TREE_CHAIN (param
))
5088 if (!args
|| nonnull_check_p (args
, param_num
))
5089 check_function_arguments_recurse (check_nonnull_arg
, NULL
,
5097 /* Check that the Nth argument of a function call (counting backwards
5098 from the end) is a (pointer)0. */
5101 check_function_sentinel (tree attrs
, tree params
)
5103 tree attr
= lookup_attribute ("sentinel", attrs
);
5108 warning ("missing sentinel in function call");
5114 if (TREE_VALUE (attr
))
5116 tree p
= TREE_VALUE (TREE_VALUE (attr
));
5117 pos
= TREE_INT_CST_LOW (p
);
5120 sentinel
= end
= params
;
5122 /* Advance `end' ahead of `sentinel' by `pos' positions. */
5123 while (pos
> 0 && TREE_CHAIN (end
))
5126 end
= TREE_CHAIN (end
);
5130 warning ("not enough arguments to fit a sentinel");
5134 /* Now advance both until we find the last parameter. */
5135 while (TREE_CHAIN (end
))
5137 end
= TREE_CHAIN (end
);
5138 sentinel
= TREE_CHAIN (sentinel
);
5141 /* Validate the sentinel. */
5142 if (!POINTER_TYPE_P (TREE_TYPE (TREE_VALUE (sentinel
)))
5143 || !integer_zerop (TREE_VALUE (sentinel
)))
5144 warning ("missing sentinel in function call");
5149 /* Helper for check_function_nonnull; given a list of operands which
5150 must be non-null in ARGS, determine if operand PARAM_NUM should be
5154 nonnull_check_p (tree args
, unsigned HOST_WIDE_INT param_num
)
5156 unsigned HOST_WIDE_INT arg_num
= 0;
5158 for (; args
; args
= TREE_CHAIN (args
))
5160 bool found
= get_nonnull_operand (TREE_VALUE (args
), &arg_num
);
5164 if (arg_num
== param_num
)
5170 /* Check that the function argument PARAM (which is operand number
5171 PARAM_NUM) is non-null. This is called by check_function_nonnull
5172 via check_function_arguments_recurse. */
5175 check_nonnull_arg (void * ARG_UNUSED (ctx
), tree param
,
5176 unsigned HOST_WIDE_INT param_num
)
5178 /* Just skip checking the argument if it's not a pointer. This can
5179 happen if the "nonnull" attribute was given without an operand
5180 list (which means to check every pointer argument). */
5182 if (TREE_CODE (TREE_TYPE (param
)) != POINTER_TYPE
)
5185 if (integer_zerop (param
))
5186 warning ("null argument where non-null required (argument %lu)",
5187 (unsigned long) param_num
);
5190 /* Helper for nonnull attribute handling; fetch the operand number
5191 from the attribute argument list. */
5194 get_nonnull_operand (tree arg_num_expr
, unsigned HOST_WIDE_INT
*valp
)
5196 /* Verify the arg number is a constant. */
5197 if (TREE_CODE (arg_num_expr
) != INTEGER_CST
5198 || TREE_INT_CST_HIGH (arg_num_expr
) != 0)
5201 *valp
= TREE_INT_CST_LOW (arg_num_expr
);
5205 /* Handle a "nothrow" attribute; arguments as in
5206 struct attribute_spec.handler. */
5209 handle_nothrow_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
5210 int ARG_UNUSED (flags
), bool *no_add_attrs
)
5212 if (TREE_CODE (*node
) == FUNCTION_DECL
)
5213 TREE_NOTHROW (*node
) = 1;
5214 /* ??? TODO: Support types. */
5217 warning ("%qE attribute ignored", name
);
5218 *no_add_attrs
= true;
5224 /* Handle a "cleanup" attribute; arguments as in
5225 struct attribute_spec.handler. */
5228 handle_cleanup_attribute (tree
*node
, tree name
, tree args
,
5229 int ARG_UNUSED (flags
), bool *no_add_attrs
)
5232 tree cleanup_id
, cleanup_decl
;
5234 /* ??? Could perhaps support cleanups on TREE_STATIC, much like we do
5235 for global destructors in C++. This requires infrastructure that
5236 we don't have generically at the moment. It's also not a feature
5237 we'd be missing too much, since we do have attribute constructor. */
5238 if (TREE_CODE (decl
) != VAR_DECL
|| TREE_STATIC (decl
))
5240 warning ("%qE attribute ignored", name
);
5241 *no_add_attrs
= true;
5245 /* Verify that the argument is a function in scope. */
5246 /* ??? We could support pointers to functions here as well, if
5247 that was considered desirable. */
5248 cleanup_id
= TREE_VALUE (args
);
5249 if (TREE_CODE (cleanup_id
) != IDENTIFIER_NODE
)
5251 error ("cleanup argument not an identifier");
5252 *no_add_attrs
= true;
5255 cleanup_decl
= lookup_name (cleanup_id
);
5256 if (!cleanup_decl
|| TREE_CODE (cleanup_decl
) != FUNCTION_DECL
)
5258 error ("cleanup argument not a function");
5259 *no_add_attrs
= true;
5263 /* That the function has proper type is checked with the
5264 eventual call to build_function_call. */
5269 /* Handle a "warn_unused_result" attribute. No special handling. */
5272 handle_warn_unused_result_attribute (tree
*node
, tree name
,
5273 tree
ARG_UNUSED (args
),
5274 int ARG_UNUSED (flags
), bool *no_add_attrs
)
5276 /* Ignore the attribute for functions not returning any value. */
5277 if (VOID_TYPE_P (TREE_TYPE (*node
)))
5279 warning ("%qE attribute ignored", name
);
5280 *no_add_attrs
= true;
5286 /* Handle a "sentinel" attribute. */
5289 handle_sentinel_attribute (tree
*node
, tree name
, tree args
,
5290 int ARG_UNUSED (flags
), bool *no_add_attrs
)
5292 tree params
= TYPE_ARG_TYPES (*node
);
5296 warning ("%qE attribute requires prototypes with named arguments", name
);
5297 *no_add_attrs
= true;
5301 while (TREE_CHAIN (params
))
5302 params
= TREE_CHAIN (params
);
5304 if (VOID_TYPE_P (TREE_VALUE (params
)))
5306 warning ("%qE attribute only applies to variadic functions", name
);
5307 *no_add_attrs
= true;
5313 tree position
= TREE_VALUE (args
);
5315 if (TREE_CODE (position
) != INTEGER_CST
)
5317 warning ("requested position is not an integer constant");
5318 *no_add_attrs
= true;
5322 if (tree_int_cst_lt (position
, integer_zero_node
))
5324 warning ("requested position is less than zero");
5325 *no_add_attrs
= true;
5333 /* Check for valid arguments being passed to a function. */
5335 check_function_arguments (tree attrs
, tree params
)
5337 /* Check for null being passed in a pointer argument that must be
5338 non-null. We also need to do this if format checking is enabled. */
5341 check_function_nonnull (attrs
, params
);
5343 /* Check for errors in format strings. */
5347 check_function_format (attrs
, params
);
5348 check_function_sentinel (attrs
, params
);
5352 /* Generic argument checking recursion routine. PARAM is the argument to
5353 be checked. PARAM_NUM is the number of the argument. CALLBACK is invoked
5354 once the argument is resolved. CTX is context for the callback. */
5356 check_function_arguments_recurse (void (*callback
)
5357 (void *, tree
, unsigned HOST_WIDE_INT
),
5358 void *ctx
, tree param
,
5359 unsigned HOST_WIDE_INT param_num
)
5361 if (TREE_CODE (param
) == NOP_EXPR
)
5363 /* Strip coercion. */
5364 check_function_arguments_recurse (callback
, ctx
,
5365 TREE_OPERAND (param
, 0), param_num
);
5369 if (TREE_CODE (param
) == CALL_EXPR
)
5371 tree type
= TREE_TYPE (TREE_TYPE (TREE_OPERAND (param
, 0)));
5373 bool found_format_arg
= false;
5375 /* See if this is a call to a known internationalization function
5376 that modifies a format arg. Such a function may have multiple
5377 format_arg attributes (for example, ngettext). */
5379 for (attrs
= TYPE_ATTRIBUTES (type
);
5381 attrs
= TREE_CHAIN (attrs
))
5382 if (is_attribute_p ("format_arg", TREE_PURPOSE (attrs
)))
5385 tree format_num_expr
;
5389 /* Extract the argument number, which was previously checked
5391 format_num_expr
= TREE_VALUE (TREE_VALUE (attrs
));
5393 gcc_assert (TREE_CODE (format_num_expr
) == INTEGER_CST
5394 && !TREE_INT_CST_HIGH (format_num_expr
));
5396 format_num
= TREE_INT_CST_LOW (format_num_expr
);
5398 for (inner_args
= TREE_OPERAND (param
, 1), i
= 1;
5400 inner_args
= TREE_CHAIN (inner_args
), i
++)
5401 if (i
== format_num
)
5403 check_function_arguments_recurse (callback
, ctx
,
5404 TREE_VALUE (inner_args
),
5406 found_format_arg
= true;
5411 /* If we found a format_arg attribute and did a recursive check,
5412 we are done with checking this argument. Otherwise, we continue
5413 and this will be considered a non-literal. */
5414 if (found_format_arg
)
5418 if (TREE_CODE (param
) == COND_EXPR
)
5420 /* Check both halves of the conditional expression. */
5421 check_function_arguments_recurse (callback
, ctx
,
5422 TREE_OPERAND (param
, 1), param_num
);
5423 check_function_arguments_recurse (callback
, ctx
,
5424 TREE_OPERAND (param
, 2), param_num
);
5428 (*callback
) (ctx
, param
, param_num
);
5431 /* Function to help qsort sort FIELD_DECLs by name order. */
5434 field_decl_cmp (const void *x_p
, const void *y_p
)
5436 const tree
*const x
= (const tree
*const) x_p
;
5437 const tree
*const y
= (const tree
*const) y_p
;
5439 if (DECL_NAME (*x
) == DECL_NAME (*y
))
5440 /* A nontype is "greater" than a type. */
5441 return (TREE_CODE (*y
) == TYPE_DECL
) - (TREE_CODE (*x
) == TYPE_DECL
);
5442 if (DECL_NAME (*x
) == NULL_TREE
)
5444 if (DECL_NAME (*y
) == NULL_TREE
)
5446 if (DECL_NAME (*x
) < DECL_NAME (*y
))
5452 gt_pointer_operator new_value
;
5456 /* This routine compares two fields like field_decl_cmp but using the
5457 pointer operator in resort_data. */
5460 resort_field_decl_cmp (const void *x_p
, const void *y_p
)
5462 const tree
*const x
= (const tree
*const) x_p
;
5463 const tree
*const y
= (const tree
*const) y_p
;
5465 if (DECL_NAME (*x
) == DECL_NAME (*y
))
5466 /* A nontype is "greater" than a type. */
5467 return (TREE_CODE (*y
) == TYPE_DECL
) - (TREE_CODE (*x
) == TYPE_DECL
);
5468 if (DECL_NAME (*x
) == NULL_TREE
)
5470 if (DECL_NAME (*y
) == NULL_TREE
)
5473 tree d1
= DECL_NAME (*x
);
5474 tree d2
= DECL_NAME (*y
);
5475 resort_data
.new_value (&d1
, resort_data
.cookie
);
5476 resort_data
.new_value (&d2
, resort_data
.cookie
);
5483 /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */
5486 resort_sorted_fields (void *obj
,
5487 void * ARG_UNUSED (orig_obj
),
5488 gt_pointer_operator new_value
,
5491 struct sorted_fields_type
*sf
= (struct sorted_fields_type
*) obj
;
5492 resort_data
.new_value
= new_value
;
5493 resort_data
.cookie
= cookie
;
5494 qsort (&sf
->elts
[0], sf
->len
, sizeof (tree
),
5495 resort_field_decl_cmp
);
5498 /* Subroutine of c_parse_error.
5499 Return the result of concatenating LHS and RHS. RHS is really
5500 a string literal, its first character is indicated by RHS_START and
5501 RHS_SIZE is its length (including the terminating NUL character).
5503 The caller is responsible for deleting the returned pointer. */
5506 catenate_strings (const char *lhs
, const char *rhs_start
, int rhs_size
)
5508 const int lhs_size
= strlen (lhs
);
5509 char *result
= XNEWVEC (char, lhs_size
+ rhs_size
);
5510 strncpy (result
, lhs
, lhs_size
);
5511 strncpy (result
+ lhs_size
, rhs_start
, rhs_size
);
5515 /* Issue the error given by MSGID, indicating that it occurred before
5516 TOKEN, which had the associated VALUE. */
5519 c_parse_error (const char *msgid
, enum cpp_ttype token
, tree value
)
5521 #define catenate_messages(M1, M2) catenate_strings ((M1), (M2), sizeof (M2))
5523 char *message
= NULL
;
5525 if (token
== CPP_EOF
)
5526 message
= catenate_messages (msgid
, " at end of input");
5527 else if (token
== CPP_CHAR
|| token
== CPP_WCHAR
)
5529 unsigned int val
= TREE_INT_CST_LOW (value
);
5530 const char *const ell
= (token
== CPP_CHAR
) ? "" : "L";
5531 if (val
<= UCHAR_MAX
&& ISGRAPH (val
))
5532 message
= catenate_messages (msgid
, " before %s'%c'");
5534 message
= catenate_messages (msgid
, " before %s'\\x%x'");
5536 error (message
, ell
, val
);
5540 else if (token
== CPP_STRING
|| token
== CPP_WSTRING
)
5541 message
= catenate_messages (msgid
, " before string constant");
5542 else if (token
== CPP_NUMBER
)
5543 message
= catenate_messages (msgid
, " before numeric constant");
5544 else if (token
== CPP_NAME
)
5546 message
= catenate_messages (msgid
, " before %qE");
5547 error (message
, value
);
5551 else if (token
< N_TTYPES
)
5553 message
= catenate_messages (msgid
, " before %qs token");
5554 error (message
, cpp_type2name (token
));
5566 #undef catenate_messages
5569 /* Walk a gimplified function and warn for functions whose return value is
5570 ignored and attribute((warn_unused_result)) is set. This is done before
5571 inlining, so we don't have to worry about that. */
5574 c_warn_unused_result (tree
*top_p
)
5577 tree_stmt_iterator i
;
5580 switch (TREE_CODE (t
))
5582 case STATEMENT_LIST
:
5583 for (i
= tsi_start (*top_p
); !tsi_end_p (i
); tsi_next (&i
))
5584 c_warn_unused_result (tsi_stmt_ptr (i
));
5588 c_warn_unused_result (&COND_EXPR_THEN (t
));
5589 c_warn_unused_result (&COND_EXPR_ELSE (t
));
5592 c_warn_unused_result (&BIND_EXPR_BODY (t
));
5594 case TRY_FINALLY_EXPR
:
5595 case TRY_CATCH_EXPR
:
5596 c_warn_unused_result (&TREE_OPERAND (t
, 0));
5597 c_warn_unused_result (&TREE_OPERAND (t
, 1));
5600 c_warn_unused_result (&CATCH_BODY (t
));
5602 case EH_FILTER_EXPR
:
5603 c_warn_unused_result (&EH_FILTER_FAILURE (t
));
5610 /* This is a naked call, as opposed to a CALL_EXPR nested inside
5611 a MODIFY_EXPR. All calls whose value is ignored should be
5612 represented like this. Look for the attribute. */
5613 fdecl
= get_callee_fndecl (t
);
5615 ftype
= TREE_TYPE (fdecl
);
5618 ftype
= TREE_TYPE (TREE_OPERAND (t
, 0));
5619 /* Look past pointer-to-function to the function type itself. */
5620 ftype
= TREE_TYPE (ftype
);
5623 if (lookup_attribute ("warn_unused_result", TYPE_ATTRIBUTES (ftype
)))
5626 warning ("%Hignoring return value of %qD, "
5627 "declared with attribute warn_unused_result",
5628 EXPR_LOCUS (t
), fdecl
);
5630 warning ("%Hignoring return value of function "
5631 "declared with attribute warn_unused_result",
5637 /* Not a container, not a call, or a call whose value is used. */
5642 /* Convert a character from the host to the target execution character
5643 set. cpplib handles this, mostly. */
5646 c_common_to_target_charset (HOST_WIDE_INT c
)
5648 /* Character constants in GCC proper are sign-extended under -fsigned-char,
5649 zero-extended under -fno-signed-char. cpplib insists that characters
5650 and character constants are always unsigned. Hence we must convert
5652 cppchar_t uc
= ((cppchar_t
)c
) & ((((cppchar_t
)1) << CHAR_BIT
)-1);
5654 uc
= cpp_host_to_exec_charset (parse_in
, uc
);
5656 if (flag_signed_char
)
5657 return ((HOST_WIDE_INT
)uc
) << (HOST_BITS_PER_WIDE_INT
- CHAR_TYPE_SIZE
)
5658 >> (HOST_BITS_PER_WIDE_INT
- CHAR_TYPE_SIZE
);
5663 /* Build the result of __builtin_offsetof. EXPR is a nested sequence of
5664 component references, with an INDIRECT_REF at the bottom; much like
5665 the traditional rendering of offsetof as a macro. Returns the folded
5666 and properly cast result. */
5669 fold_offsetof_1 (tree expr
)
5671 enum tree_code code
= PLUS_EXPR
;
5674 switch (TREE_CODE (expr
))
5680 return size_zero_node
;
5683 base
= fold_offsetof_1 (TREE_OPERAND (expr
, 0));
5684 if (base
== error_mark_node
)
5687 t
= TREE_OPERAND (expr
, 1);
5688 if (DECL_C_BIT_FIELD (t
))
5690 error ("attempt to take address of bit-field structure "
5692 return error_mark_node
;
5694 off
= size_binop (PLUS_EXPR
, DECL_FIELD_OFFSET (t
),
5695 size_int (tree_low_cst (DECL_FIELD_BIT_OFFSET (t
), 1)
5700 base
= fold_offsetof_1 (TREE_OPERAND (expr
, 0));
5701 if (base
== error_mark_node
)
5704 t
= TREE_OPERAND (expr
, 1);
5705 if (TREE_CODE (t
) == INTEGER_CST
&& tree_int_cst_sgn (t
) < 0)
5708 t
= fold (build1 (NEGATE_EXPR
, TREE_TYPE (t
), t
));
5710 t
= convert (sizetype
, t
);
5711 off
= size_binop (MULT_EXPR
, TYPE_SIZE_UNIT (TREE_TYPE (expr
)), t
);
5718 return size_binop (code
, base
, off
);
5722 fold_offsetof (tree expr
)
5724 /* Convert back from the internal sizetype to size_t. */
5725 return convert (size_type_node
, fold_offsetof_1 (expr
));
5728 /* Print an error message for an invalid lvalue. USE says
5729 how the lvalue is being used and so selects the error message. */
5732 lvalue_error (enum lvalue_use use
)
5737 error ("invalid lvalue in assignment");
5740 error ("invalid lvalue in increment");
5743 error ("invalid lvalue in decrement");
5746 error ("invalid lvalue in unary %<&%>");
5749 error ("invalid lvalue in asm statement");
5756 #include "gt-c-common.h"