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 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"
50 cpp_reader
*parse_in
; /* Declared in c-pragma.h. */
52 /* We let tm.h override the types used here, to handle trivial differences
53 such as the choice of unsigned int or long unsigned int for size_t.
54 When machines start needing nontrivial differences in the size type,
55 it would be best to do something here to figure out automatically
56 from other information what type to use. */
59 #define SIZE_TYPE "long unsigned int"
63 #define PID_TYPE "int"
67 #define WCHAR_TYPE "int"
70 /* WCHAR_TYPE gets overridden by -fshort-wchar. */
71 #define MODIFIED_WCHAR_TYPE \
72 (flag_short_wchar ? "short unsigned int" : WCHAR_TYPE)
75 #define PTRDIFF_TYPE "long int"
79 #define WINT_TYPE "unsigned int"
83 #define INTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
85 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
91 #define UINTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
93 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
94 ? "long unsigned int" \
95 : "long long unsigned int"))
98 /* The following symbols are subsumed in the c_global_trees array, and
99 listed here individually for documentation purposes.
101 INTEGER_TYPE and REAL_TYPE nodes for the standard data types.
103 tree short_integer_type_node;
104 tree long_integer_type_node;
105 tree long_long_integer_type_node;
107 tree short_unsigned_type_node;
108 tree long_unsigned_type_node;
109 tree long_long_unsigned_type_node;
111 tree truthvalue_type_node;
112 tree truthvalue_false_node;
113 tree truthvalue_true_node;
115 tree ptrdiff_type_node;
117 tree unsigned_char_type_node;
118 tree signed_char_type_node;
119 tree wchar_type_node;
120 tree signed_wchar_type_node;
121 tree unsigned_wchar_type_node;
123 tree float_type_node;
124 tree double_type_node;
125 tree long_double_type_node;
127 tree complex_integer_type_node;
128 tree complex_float_type_node;
129 tree complex_double_type_node;
130 tree complex_long_double_type_node;
132 tree intQI_type_node;
133 tree intHI_type_node;
134 tree intSI_type_node;
135 tree intDI_type_node;
136 tree intTI_type_node;
138 tree unsigned_intQI_type_node;
139 tree unsigned_intHI_type_node;
140 tree unsigned_intSI_type_node;
141 tree unsigned_intDI_type_node;
142 tree unsigned_intTI_type_node;
144 tree widest_integer_literal_type_node;
145 tree widest_unsigned_literal_type_node;
147 Nodes for types `void *' and `const void *'.
149 tree ptr_type_node, const_ptr_type_node;
151 Nodes for types `char *' and `const char *'.
153 tree string_type_node, const_string_type_node;
155 Type `char[SOMENUMBER]'.
156 Used when an array of char is needed and the size is irrelevant.
158 tree char_array_type_node;
160 Type `int[SOMENUMBER]' or something like it.
161 Used when an array of int needed and the size is irrelevant.
163 tree int_array_type_node;
165 Type `wchar_t[SOMENUMBER]' or something like it.
166 Used when a wide string literal is created.
168 tree wchar_array_type_node;
170 Type `int ()' -- used for implicit declaration of functions.
172 tree default_function_type;
174 A VOID_TYPE node, packaged in a TREE_LIST.
178 The lazily created VAR_DECLs for __FUNCTION__, __PRETTY_FUNCTION__,
179 and __func__. (C doesn't generate __FUNCTION__ and__PRETTY_FUNCTION__
180 VAR_DECLS, but C++ does.)
182 tree function_name_decl_node;
183 tree pretty_function_name_decl_node;
184 tree c99_function_name_decl_node;
186 Stack of nested function name VAR_DECLs.
188 tree saved_function_name_decls;
192 tree c_global_trees
[CTI_MAX
];
194 /* TRUE if a code represents a statement. The front end init
195 langhook should take care of initialization of this array. */
197 bool statement_code_p
[MAX_TREE_CODES
];
199 /* Switches common to the C front ends. */
201 /* Nonzero if prepreprocessing only. */
203 int flag_preprocess_only
;
205 /* Nonzero means don't output line number information. */
207 char flag_no_line_commands
;
209 /* Nonzero causes -E output not to be done, but directives such as
210 #define that have side effects are still obeyed. */
214 /* Nonzero means dump macros in some fashion. */
216 char flag_dump_macros
;
218 /* Nonzero means pass #include lines through to the output. */
220 char flag_dump_includes
;
222 /* Nonzero means process PCH files while preprocessing. */
224 bool flag_pch_preprocess
;
226 /* The file name to which we should write a precompiled header, or
227 NULL if no header will be written in this compile. */
229 const char *pch_file
;
231 /* Nonzero if an ISO standard was selected. It rejects macros in the
235 /* Nonzero if -undef was given. It suppresses target built-in macros
239 /* Nonzero means don't recognize the non-ANSI builtin functions. */
243 /* Nonzero means don't recognize the non-ANSI builtin functions.
246 int flag_no_nonansi_builtin
;
248 /* Nonzero means give `double' the same size as `float'. */
250 int flag_short_double
;
252 /* Nonzero means give `wchar_t' the same size as `short'. */
254 int flag_short_wchar
;
256 /* Nonzero means allow Microsoft extensions without warnings or errors. */
257 int flag_ms_extensions
;
259 /* Nonzero means don't recognize the keyword `asm'. */
263 /* Nonzero means give string constants the type `const char *', as mandated
266 int flag_const_strings
;
268 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
270 int flag_signed_bitfields
= 1;
271 int explicit_flag_signed_bitfields
;
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 warn about implicit declarations. */
464 int warn_implicit
= 1;
466 /* Maximum template instantiation depth. This limit is rather
467 arbitrary, but it exists to limit the time it takes to notice
468 infinite template instantiations. */
470 int max_tinst_depth
= 500;
474 /* The elements of `ridpointers' are identifier nodes for the reserved
475 type names and storage classes. It is indexed by a RID_... value. */
478 tree (*make_fname_decl
) (tree
, int);
480 /* If non-NULL, the address of a language-specific function that
481 returns 1 for language-specific statement codes. */
482 int (*lang_statement_code_p
) (enum tree_code
);
484 /* If non-NULL, the address of a language-specific function that takes
485 any action required right before expand_function_end is called. */
486 void (*lang_expand_function_end
) (void);
488 /* Nonzero means the expression being parsed will never be evaluated.
489 This is a count, since unevaluated expressions can nest. */
492 /* Information about how a function name is generated. */
495 tree
*const decl
; /* pointer to the VAR_DECL. */
496 const unsigned rid
; /* RID number for the identifier. */
497 const int pretty
; /* How pretty is it? */
500 /* The three ways of getting then name of the current function. */
502 const struct fname_var_t fname_vars
[] =
504 /* C99 compliant __func__, must be first. */
505 {&c99_function_name_decl_node
, RID_C99_FUNCTION_NAME
, 0},
506 /* GCC __FUNCTION__ compliant. */
507 {&function_name_decl_node
, RID_FUNCTION_NAME
, 0},
508 /* GCC __PRETTY_FUNCTION__ compliant. */
509 {&pretty_function_name_decl_node
, RID_PRETTY_FUNCTION_NAME
, 1},
513 static int constant_fits_type_p (tree
, tree
);
514 static tree
check_case_value (tree
);
515 static bool check_case_bounds (tree
, tree
, tree
*, tree
*);
517 static tree
handle_packed_attribute (tree
*, tree
, tree
, int, bool *);
518 static tree
handle_nocommon_attribute (tree
*, tree
, tree
, int, bool *);
519 static tree
handle_common_attribute (tree
*, tree
, tree
, int, bool *);
520 static tree
handle_noreturn_attribute (tree
*, tree
, tree
, int, bool *);
521 static tree
handle_noinline_attribute (tree
*, tree
, tree
, int, bool *);
522 static tree
handle_always_inline_attribute (tree
*, tree
, tree
, int,
524 static tree
handle_used_attribute (tree
*, tree
, tree
, int, bool *);
525 static tree
handle_unused_attribute (tree
*, tree
, tree
, int, bool *);
526 static tree
handle_const_attribute (tree
*, tree
, tree
, int, bool *);
527 static tree
handle_transparent_union_attribute (tree
*, tree
, tree
,
529 static tree
handle_constructor_attribute (tree
*, tree
, tree
, int, bool *);
530 static tree
handle_destructor_attribute (tree
*, tree
, tree
, int, bool *);
531 static tree
handle_mode_attribute (tree
*, tree
, tree
, int, bool *);
532 static tree
handle_section_attribute (tree
*, tree
, tree
, int, bool *);
533 static tree
handle_aligned_attribute (tree
*, tree
, tree
, int, bool *);
534 static tree
handle_weak_attribute (tree
*, tree
, tree
, int, bool *) ;
535 static tree
handle_alias_attribute (tree
*, tree
, tree
, int, bool *);
536 static tree
handle_visibility_attribute (tree
*, tree
, tree
, int,
538 static tree
handle_tls_model_attribute (tree
*, tree
, tree
, int,
540 static tree
handle_no_instrument_function_attribute (tree
*, tree
,
542 static tree
handle_malloc_attribute (tree
*, tree
, tree
, int, bool *);
543 static tree
handle_no_limit_stack_attribute (tree
*, tree
, tree
, int,
545 static tree
handle_pure_attribute (tree
*, tree
, tree
, int, bool *);
546 static tree
handle_deprecated_attribute (tree
*, tree
, tree
, int,
548 static tree
handle_vector_size_attribute (tree
*, tree
, tree
, int,
550 static tree
handle_nonnull_attribute (tree
*, tree
, tree
, int, bool *);
551 static tree
handle_nothrow_attribute (tree
*, tree
, tree
, int, bool *);
552 static tree
handle_cleanup_attribute (tree
*, tree
, tree
, int, bool *);
553 static tree
handle_warn_unused_result_attribute (tree
*, tree
, tree
, int,
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 { "no_stack_limit", 0, 0, true, false, false,
613 handle_no_limit_stack_attribute
},
614 { "pure", 0, 0, true, false, false,
615 handle_pure_attribute
},
616 { "deprecated", 0, 0, false, false, false,
617 handle_deprecated_attribute
},
618 { "vector_size", 1, 1, false, true, false,
619 handle_vector_size_attribute
},
620 { "visibility", 1, 1, false, false, false,
621 handle_visibility_attribute
},
622 { "tls_model", 1, 1, true, false, false,
623 handle_tls_model_attribute
},
624 { "nonnull", 0, -1, false, true, true,
625 handle_nonnull_attribute
},
626 { "nothrow", 0, 0, true, false, false,
627 handle_nothrow_attribute
},
628 { "may_alias", 0, 0, false, true, false, NULL
},
629 { "cleanup", 1, 1, true, false, false,
630 handle_cleanup_attribute
},
631 { "warn_unused_result", 0, 0, false, true, true,
632 handle_warn_unused_result_attribute
},
633 { NULL
, 0, 0, false, false, false, NULL
}
636 /* Give the specifications for the format attributes, used by C and all
639 const struct attribute_spec c_common_format_attribute_table
[] =
641 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
642 { "format", 3, 3, false, true, true,
643 handle_format_attribute
},
644 { "format_arg", 1, 1, false, true, true,
645 handle_format_arg_attribute
},
646 { NULL
, 0, 0, false, false, false, NULL
}
649 /* Push current bindings for the function name VAR_DECLS. */
652 start_fname_decls (void)
655 tree saved
= NULL_TREE
;
657 for (ix
= 0; fname_vars
[ix
].decl
; ix
++)
659 tree decl
= *fname_vars
[ix
].decl
;
663 saved
= tree_cons (decl
, build_int_2 (ix
, 0), saved
);
664 *fname_vars
[ix
].decl
= NULL_TREE
;
667 if (saved
|| saved_function_name_decls
)
668 /* Normally they'll have been NULL, so only push if we've got a
669 stack, or they are non-NULL. */
670 saved_function_name_decls
= tree_cons (saved
, NULL_TREE
,
671 saved_function_name_decls
);
674 /* Finish up the current bindings, adding them into the current function's
675 statement tree. This must be done _before_ finish_stmt_tree is called.
676 If there is no current function, we must be at file scope and no statements
677 are involved. Pop the previous bindings. */
680 finish_fname_decls (void)
683 tree stmts
= NULL_TREE
;
684 tree stack
= saved_function_name_decls
;
686 for (; stack
&& TREE_VALUE (stack
); stack
= TREE_CHAIN (stack
))
687 append_to_statement_list (TREE_VALUE (stack
), &stmts
);
691 tree
*bodyp
= &DECL_SAVED_TREE (current_function_decl
);
693 if (TREE_CODE (*bodyp
) == BIND_EXPR
)
694 bodyp
= &BIND_EXPR_BODY (*bodyp
);
696 append_to_statement_list (*bodyp
, &stmts
);
700 for (ix
= 0; fname_vars
[ix
].decl
; ix
++)
701 *fname_vars
[ix
].decl
= NULL_TREE
;
705 /* We had saved values, restore them. */
708 for (saved
= TREE_PURPOSE (stack
); saved
; saved
= TREE_CHAIN (saved
))
710 tree decl
= TREE_PURPOSE (saved
);
711 unsigned ix
= TREE_INT_CST_LOW (TREE_VALUE (saved
));
713 *fname_vars
[ix
].decl
= decl
;
715 stack
= TREE_CHAIN (stack
);
717 saved_function_name_decls
= stack
;
720 /* Return the text name of the current function, suitably prettified
721 by PRETTY_P. Return string must be freed by caller. */
724 fname_as_string (int pretty_p
)
726 const char *name
= "top level";
736 if (current_function_decl
)
737 name
= lang_hooks
.decl_printable_name (current_function_decl
, vrb
);
739 if (c_lex_string_translate
)
741 int len
= strlen (name
) + 3; /* Two for '"'s. One for NULL. */
742 cpp_string cstr
= { 0, 0 }, strname
;
744 namep
= XNEWVEC (char, len
);
745 snprintf (namep
, len
, "\"%s\"", name
);
746 strname
.text
= (unsigned char *) namep
;
747 strname
.len
= len
- 1;
749 if (cpp_interpret_string (parse_in
, &strname
, 1, &cstr
, false))
750 return (char *) cstr
.text
;
753 namep
= xstrdup (name
);
758 /* Expand DECL if it declares an entity not handled by the
762 c_expand_decl (tree decl
)
764 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
766 /* Let the back-end know about this variable. */
767 if (!anon_aggr_type_p (TREE_TYPE (decl
)))
768 emit_local_var (decl
);
770 expand_anon_union_decl (decl
, NULL_TREE
,
771 DECL_ANON_UNION_ELEMS (decl
));
780 /* Return the VAR_DECL for a const char array naming the current
781 function. If the VAR_DECL has not yet been created, create it
782 now. RID indicates how it should be formatted and IDENTIFIER_NODE
783 ID is its name (unfortunately C and C++ hold the RID values of
784 keywords in different places, so we can't derive RID from ID in
785 this language independent code. */
788 fname_decl (unsigned int rid
, tree id
)
791 tree decl
= NULL_TREE
;
793 for (ix
= 0; fname_vars
[ix
].decl
; ix
++)
794 if (fname_vars
[ix
].rid
== rid
)
797 decl
= *fname_vars
[ix
].decl
;
800 /* If a tree is built here, it would normally have the lineno of
801 the current statement. Later this tree will be moved to the
802 beginning of the function and this line number will be wrong.
803 To avoid this problem set the lineno to 0 here; that prevents
804 it from appearing in the RTL. */
806 location_t saved_location
= input_location
;
807 #ifdef USE_MAPPED_LOCATION
808 input_location
= UNKNOWN_LOCATION
;
813 stmts
= push_stmt_list ();
814 decl
= (*make_fname_decl
) (id
, fname_vars
[ix
].pretty
);
815 stmts
= pop_stmt_list (stmts
);
816 if (!IS_EMPTY_STMT (stmts
))
817 saved_function_name_decls
818 = tree_cons (decl
, stmts
, saved_function_name_decls
);
819 *fname_vars
[ix
].decl
= decl
;
820 input_location
= saved_location
;
822 if (!ix
&& !current_function_decl
)
823 pedwarn ("%J'%D' is not defined outside of function scope", decl
, decl
);
828 /* Given a STRING_CST, give it a suitable array-of-chars data type. */
831 fix_string_type (tree value
)
833 const int wchar_bytes
= TYPE_PRECISION (wchar_type_node
) / BITS_PER_UNIT
;
834 const int wide_flag
= TREE_TYPE (value
) == wchar_array_type_node
;
835 const int nchars_max
= flag_isoc99
? 4095 : 509;
836 int length
= TREE_STRING_LENGTH (value
);
839 /* Compute the number of elements, for the array type. */
840 nchars
= wide_flag
? length
/ wchar_bytes
: length
;
842 if (pedantic
&& nchars
- 1 > nchars_max
&& !c_dialect_cxx ())
843 pedwarn ("string length `%d' is greater than the length `%d' ISO C%d compilers are required to support",
844 nchars
- 1, nchars_max
, flag_isoc99
? 99 : 89);
846 /* Create the array type for the string constant.
847 -Wwrite-strings says make the string constant an array of const char
848 so that copying it to a non-const pointer will get a warning.
849 For C++, this is the standard behavior. */
850 if (flag_const_strings
)
853 = build_type_variant (wide_flag
? wchar_type_node
: char_type_node
,
856 = build_array_type (elements
,
857 build_index_type (build_int_2 (nchars
- 1, 0)));
861 = build_array_type (wide_flag
? wchar_type_node
: char_type_node
,
862 build_index_type (build_int_2 (nchars
- 1, 0)));
864 TREE_CONSTANT (value
) = 1;
865 TREE_INVARIANT (value
) = 1;
866 TREE_READONLY (value
) = 1;
867 TREE_STATIC (value
) = 1;
871 /* Print a warning if a constant expression had overflow in folding.
872 Invoke this function on every expression that the language
873 requires to be a constant expression.
874 Note the ANSI C standard says it is erroneous for a
875 constant expression to overflow. */
878 constant_expression_warning (tree value
)
880 if ((TREE_CODE (value
) == INTEGER_CST
|| TREE_CODE (value
) == REAL_CST
881 || TREE_CODE (value
) == VECTOR_CST
882 || TREE_CODE (value
) == COMPLEX_CST
)
883 && TREE_CONSTANT_OVERFLOW (value
) && pedantic
)
884 pedwarn ("overflow in constant expression");
887 /* Print a warning if an expression had overflow in folding.
888 Invoke this function on every expression that
889 (1) appears in the source code, and
890 (2) might be a constant expression that overflowed, and
891 (3) is not already checked by convert_and_check;
892 however, do not invoke this function on operands of explicit casts. */
895 overflow_warning (tree value
)
897 if ((TREE_CODE (value
) == INTEGER_CST
898 || (TREE_CODE (value
) == COMPLEX_CST
899 && TREE_CODE (TREE_REALPART (value
)) == INTEGER_CST
))
900 && TREE_OVERFLOW (value
))
902 TREE_OVERFLOW (value
) = 0;
903 if (skip_evaluation
== 0)
904 warning ("integer overflow in expression");
906 else if ((TREE_CODE (value
) == REAL_CST
907 || (TREE_CODE (value
) == COMPLEX_CST
908 && TREE_CODE (TREE_REALPART (value
)) == REAL_CST
))
909 && TREE_OVERFLOW (value
))
911 TREE_OVERFLOW (value
) = 0;
912 if (skip_evaluation
== 0)
913 warning ("floating point overflow in expression");
915 else if (TREE_CODE (value
) == VECTOR_CST
&& TREE_OVERFLOW (value
))
917 TREE_OVERFLOW (value
) = 0;
918 if (skip_evaluation
== 0)
919 warning ("vector overflow in expression");
923 /* Print a warning if a large constant is truncated to unsigned,
924 or if -Wconversion is used and a constant < 0 is converted to unsigned.
925 Invoke this function on every expression that might be implicitly
926 converted to an unsigned type. */
929 unsigned_conversion_warning (tree result
, tree operand
)
931 tree type
= TREE_TYPE (result
);
933 if (TREE_CODE (operand
) == INTEGER_CST
934 && TREE_CODE (type
) == INTEGER_TYPE
935 && TYPE_UNSIGNED (type
)
936 && skip_evaluation
== 0
937 && !int_fits_type_p (operand
, type
))
939 if (!int_fits_type_p (operand
, c_common_signed_type (type
)))
940 /* This detects cases like converting -129 or 256 to unsigned char. */
941 warning ("large integer implicitly truncated to unsigned type");
942 else if (warn_conversion
)
943 warning ("negative integer implicitly converted to unsigned type");
947 /* Nonzero if constant C has a value that is permissible
948 for type TYPE (an INTEGER_TYPE). */
951 constant_fits_type_p (tree c
, tree type
)
953 if (TREE_CODE (c
) == INTEGER_CST
)
954 return int_fits_type_p (c
, type
);
956 c
= convert (type
, c
);
957 return !TREE_OVERFLOW (c
);
960 /* Nonzero if vector types T1 and T2 can be converted to each other
961 without an explicit cast. */
963 vector_types_convertible_p (tree t1
, tree t2
)
965 return targetm
.vector_opaque_p (t1
)
966 || targetm
.vector_opaque_p (t2
)
967 || (tree_int_cst_equal (TYPE_SIZE (t1
), TYPE_SIZE (t2
))
968 && INTEGRAL_TYPE_P (TREE_TYPE (t1
))
969 == INTEGRAL_TYPE_P (TREE_TYPE (t2
)));
972 /* Convert EXPR to TYPE, warning about conversion problems with constants.
973 Invoke this function on every expression that is converted implicitly,
974 i.e. because of language rules and not because of an explicit cast. */
977 convert_and_check (tree type
, tree expr
)
979 tree t
= convert (type
, expr
);
980 if (TREE_CODE (t
) == INTEGER_CST
)
982 if (TREE_OVERFLOW (t
))
984 TREE_OVERFLOW (t
) = 0;
986 /* Do not diagnose overflow in a constant expression merely
987 because a conversion overflowed. */
988 TREE_CONSTANT_OVERFLOW (t
) = TREE_CONSTANT_OVERFLOW (expr
);
990 /* No warning for converting 0x80000000 to int. */
991 if (!(TYPE_UNSIGNED (type
) < TYPE_UNSIGNED (TREE_TYPE (expr
))
992 && TREE_CODE (TREE_TYPE (expr
)) == INTEGER_TYPE
993 && TYPE_PRECISION (type
) == TYPE_PRECISION (TREE_TYPE (expr
))))
994 /* If EXPR fits in the unsigned version of TYPE,
995 don't warn unless pedantic. */
997 || TYPE_UNSIGNED (type
)
998 || ! constant_fits_type_p (expr
,
999 c_common_unsigned_type (type
)))
1000 && skip_evaluation
== 0)
1001 warning ("overflow in implicit constant conversion");
1004 unsigned_conversion_warning (t
, expr
);
1009 /* A node in a list that describes references to variables (EXPR), which are
1010 either read accesses if WRITER is zero, or write accesses, in which case
1011 WRITER is the parent of EXPR. */
1018 /* Used to implement a cache the results of a call to verify_tree. We only
1019 use this for SAVE_EXPRs. */
1022 struct tlist_cache
*next
;
1023 struct tlist
*cache_before_sp
;
1024 struct tlist
*cache_after_sp
;
1028 /* Obstack to use when allocating tlist structures, and corresponding
1030 static struct obstack tlist_obstack
;
1031 static char *tlist_firstobj
= 0;
1033 /* Keep track of the identifiers we've warned about, so we can avoid duplicate
1035 static struct tlist
*warned_ids
;
1036 /* SAVE_EXPRs need special treatment. We process them only once and then
1037 cache the results. */
1038 static struct tlist_cache
*save_expr_cache
;
1040 static void add_tlist (struct tlist
**, struct tlist
*, tree
, int);
1041 static void merge_tlist (struct tlist
**, struct tlist
*, int);
1042 static void verify_tree (tree
, struct tlist
**, struct tlist
**, tree
);
1043 static int warning_candidate_p (tree
);
1044 static void warn_for_collisions (struct tlist
*);
1045 static void warn_for_collisions_1 (tree
, tree
, struct tlist
*, int);
1046 static struct tlist
*new_tlist (struct tlist
*, tree
, tree
);
1048 /* Create a new struct tlist and fill in its fields. */
1049 static struct tlist
*
1050 new_tlist (struct tlist
*next
, tree t
, tree writer
)
1053 l
= XOBNEW (&tlist_obstack
, struct tlist
);
1060 /* Add duplicates of the nodes found in ADD to the list *TO. If EXCLUDE_WRITER
1061 is nonnull, we ignore any node we find which has a writer equal to it. */
1064 add_tlist (struct tlist
**to
, struct tlist
*add
, tree exclude_writer
, int copy
)
1068 struct tlist
*next
= add
->next
;
1071 if (! exclude_writer
|| add
->writer
!= exclude_writer
)
1072 *to
= copy
? new_tlist (*to
, add
->expr
, add
->writer
) : add
;
1077 /* Merge the nodes of ADD into TO. This merging process is done so that for
1078 each variable that already exists in TO, no new node is added; however if
1079 there is a write access recorded in ADD, and an occurrence on TO is only
1080 a read access, then the occurrence in TO will be modified to record the
1084 merge_tlist (struct tlist
**to
, struct tlist
*add
, int copy
)
1086 struct tlist
**end
= to
;
1089 end
= &(*end
)->next
;
1095 struct tlist
*next
= add
->next
;
1097 for (tmp2
= *to
; tmp2
; tmp2
= tmp2
->next
)
1098 if (tmp2
->expr
== add
->expr
)
1102 tmp2
->writer
= add
->writer
;
1106 *end
= copy
? add
: new_tlist (NULL
, add
->expr
, add
->writer
);
1107 end
= &(*end
)->next
;
1114 /* WRITTEN is a variable, WRITER is its parent. Warn if any of the variable
1115 references in list LIST conflict with it, excluding reads if ONLY writers
1119 warn_for_collisions_1 (tree written
, tree writer
, struct tlist
*list
,
1124 /* Avoid duplicate warnings. */
1125 for (tmp
= warned_ids
; tmp
; tmp
= tmp
->next
)
1126 if (tmp
->expr
== written
)
1131 if (list
->expr
== written
1132 && list
->writer
!= writer
1133 && (! only_writes
|| list
->writer
)
1134 && DECL_NAME (list
->expr
))
1136 warned_ids
= new_tlist (warned_ids
, written
, NULL_TREE
);
1137 warning ("operation on `%s' may be undefined",
1138 IDENTIFIER_POINTER (DECL_NAME (list
->expr
)));
1144 /* Given a list LIST of references to variables, find whether any of these
1145 can cause conflicts due to missing sequence points. */
1148 warn_for_collisions (struct tlist
*list
)
1152 for (tmp
= list
; tmp
; tmp
= tmp
->next
)
1155 warn_for_collisions_1 (tmp
->expr
, tmp
->writer
, list
, 0);
1159 /* Return nonzero if X is a tree that can be verified by the sequence point
1162 warning_candidate_p (tree x
)
1164 return TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == PARM_DECL
;
1167 /* Walk the tree X, and record accesses to variables. If X is written by the
1168 parent tree, WRITER is the parent.
1169 We store accesses in one of the two lists: PBEFORE_SP, and PNO_SP. If this
1170 expression or its only operand forces a sequence point, then everything up
1171 to the sequence point is stored in PBEFORE_SP. Everything else gets stored
1173 Once we return, we will have emitted warnings if any subexpression before
1174 such a sequence point could be undefined. On a higher level, however, the
1175 sequence point may not be relevant, and we'll merge the two lists.
1177 Example: (b++, a) + b;
1178 The call that processes the COMPOUND_EXPR will store the increment of B
1179 in PBEFORE_SP, and the use of A in PNO_SP. The higher-level call that
1180 processes the PLUS_EXPR will need to merge the two lists so that
1181 eventually, all accesses end up on the same list (and we'll warn about the
1182 unordered subexpressions b++ and b.
1184 A note on merging. If we modify the former example so that our expression
1187 care must be taken not simply to add all three expressions into the final
1188 PNO_SP list. The function merge_tlist takes care of that by merging the
1189 before-SP list of the COMPOUND_EXPR into its after-SP list in a special
1190 way, so that no more than one access to B is recorded. */
1193 verify_tree (tree x
, struct tlist
**pbefore_sp
, struct tlist
**pno_sp
,
1196 struct tlist
*tmp_before
, *tmp_nosp
, *tmp_list2
, *tmp_list3
;
1197 enum tree_code code
;
1200 /* X may be NULL if it is the operand of an empty statement expression
1206 code
= TREE_CODE (x
);
1207 cl
= TREE_CODE_CLASS (code
);
1209 if (warning_candidate_p (x
))
1211 *pno_sp
= new_tlist (*pno_sp
, x
, writer
);
1221 case TRUTH_ANDIF_EXPR
:
1222 case TRUTH_ORIF_EXPR
:
1223 tmp_before
= tmp_nosp
= tmp_list3
= 0;
1224 verify_tree (TREE_OPERAND (x
, 0), &tmp_before
, &tmp_nosp
, NULL_TREE
);
1225 warn_for_collisions (tmp_nosp
);
1226 merge_tlist (pbefore_sp
, tmp_before
, 0);
1227 merge_tlist (pbefore_sp
, tmp_nosp
, 0);
1228 verify_tree (TREE_OPERAND (x
, 1), &tmp_list3
, pno_sp
, NULL_TREE
);
1229 merge_tlist (pbefore_sp
, tmp_list3
, 0);
1233 tmp_before
= tmp_list2
= 0;
1234 verify_tree (TREE_OPERAND (x
, 0), &tmp_before
, &tmp_list2
, NULL_TREE
);
1235 warn_for_collisions (tmp_list2
);
1236 merge_tlist (pbefore_sp
, tmp_before
, 0);
1237 merge_tlist (pbefore_sp
, tmp_list2
, 1);
1239 tmp_list3
= tmp_nosp
= 0;
1240 verify_tree (TREE_OPERAND (x
, 1), &tmp_list3
, &tmp_nosp
, NULL_TREE
);
1241 warn_for_collisions (tmp_nosp
);
1242 merge_tlist (pbefore_sp
, tmp_list3
, 0);
1244 tmp_list3
= tmp_list2
= 0;
1245 verify_tree (TREE_OPERAND (x
, 2), &tmp_list3
, &tmp_list2
, NULL_TREE
);
1246 warn_for_collisions (tmp_list2
);
1247 merge_tlist (pbefore_sp
, tmp_list3
, 0);
1248 /* Rather than add both tmp_nosp and tmp_list2, we have to merge the
1249 two first, to avoid warning for (a ? b++ : b++). */
1250 merge_tlist (&tmp_nosp
, tmp_list2
, 0);
1251 add_tlist (pno_sp
, tmp_nosp
, NULL_TREE
, 0);
1254 case PREDECREMENT_EXPR
:
1255 case PREINCREMENT_EXPR
:
1256 case POSTDECREMENT_EXPR
:
1257 case POSTINCREMENT_EXPR
:
1258 verify_tree (TREE_OPERAND (x
, 0), pno_sp
, pno_sp
, x
);
1262 tmp_before
= tmp_nosp
= tmp_list3
= 0;
1263 verify_tree (TREE_OPERAND (x
, 1), &tmp_before
, &tmp_nosp
, NULL_TREE
);
1264 verify_tree (TREE_OPERAND (x
, 0), &tmp_list3
, &tmp_list3
, x
);
1265 /* Expressions inside the LHS are not ordered wrt. the sequence points
1266 in the RHS. Example:
1268 Despite the fact that the modification of "a" is in the before_sp
1269 list (tmp_before), it conflicts with the use of "a" in the LHS.
1270 We can handle this by adding the contents of tmp_list3
1271 to those of tmp_before, and redoing the collision warnings for that
1273 add_tlist (&tmp_before
, tmp_list3
, x
, 1);
1274 warn_for_collisions (tmp_before
);
1275 /* Exclude the LHS itself here; we first have to merge it into the
1276 tmp_nosp list. This is done to avoid warning for "a = a"; if we
1277 didn't exclude the LHS, we'd get it twice, once as a read and once
1279 add_tlist (pno_sp
, tmp_list3
, x
, 0);
1280 warn_for_collisions_1 (TREE_OPERAND (x
, 0), x
, tmp_nosp
, 1);
1282 merge_tlist (pbefore_sp
, tmp_before
, 0);
1283 if (warning_candidate_p (TREE_OPERAND (x
, 0)))
1284 merge_tlist (&tmp_nosp
, new_tlist (NULL
, TREE_OPERAND (x
, 0), x
), 0);
1285 add_tlist (pno_sp
, tmp_nosp
, NULL_TREE
, 1);
1289 /* We need to warn about conflicts among arguments and conflicts between
1290 args and the function address. Side effects of the function address,
1291 however, are not ordered by the sequence point of the call. */
1292 tmp_before
= tmp_nosp
= tmp_list2
= tmp_list3
= 0;
1293 verify_tree (TREE_OPERAND (x
, 0), &tmp_before
, &tmp_nosp
, NULL_TREE
);
1294 if (TREE_OPERAND (x
, 1))
1295 verify_tree (TREE_OPERAND (x
, 1), &tmp_list2
, &tmp_list3
, NULL_TREE
);
1296 merge_tlist (&tmp_list3
, tmp_list2
, 0);
1297 add_tlist (&tmp_before
, tmp_list3
, NULL_TREE
, 0);
1298 add_tlist (&tmp_before
, tmp_nosp
, NULL_TREE
, 0);
1299 warn_for_collisions (tmp_before
);
1300 add_tlist (pbefore_sp
, tmp_before
, NULL_TREE
, 0);
1304 /* Scan all the list, e.g. indices of multi dimensional array. */
1307 tmp_before
= tmp_nosp
= 0;
1308 verify_tree (TREE_VALUE (x
), &tmp_before
, &tmp_nosp
, NULL_TREE
);
1309 merge_tlist (&tmp_nosp
, tmp_before
, 0);
1310 add_tlist (pno_sp
, tmp_nosp
, NULL_TREE
, 0);
1317 struct tlist_cache
*t
;
1318 for (t
= save_expr_cache
; t
; t
= t
->next
)
1324 t
= XOBNEW (&tlist_obstack
, struct tlist_cache
);
1325 t
->next
= save_expr_cache
;
1327 save_expr_cache
= t
;
1329 tmp_before
= tmp_nosp
= 0;
1330 verify_tree (TREE_OPERAND (x
, 0), &tmp_before
, &tmp_nosp
, NULL_TREE
);
1331 warn_for_collisions (tmp_nosp
);
1336 struct tlist
*t
= tmp_nosp
;
1338 merge_tlist (&tmp_list3
, t
, 0);
1340 t
->cache_before_sp
= tmp_before
;
1341 t
->cache_after_sp
= tmp_list3
;
1343 merge_tlist (pbefore_sp
, t
->cache_before_sp
, 1);
1344 add_tlist (pno_sp
, t
->cache_after_sp
, NULL_TREE
, 1);
1353 if (first_rtl_op (code
) == 0)
1355 x
= TREE_OPERAND (x
, 0);
1370 int max
= first_rtl_op (TREE_CODE (x
));
1371 for (lp
= 0; lp
< max
; lp
++)
1373 tmp_before
= tmp_nosp
= 0;
1374 verify_tree (TREE_OPERAND (x
, lp
), &tmp_before
, &tmp_nosp
, NULL_TREE
);
1375 merge_tlist (&tmp_nosp
, tmp_before
, 0);
1376 add_tlist (pno_sp
, tmp_nosp
, NULL_TREE
, 0);
1383 /* Try to warn for undefined behavior in EXPR due to missing sequence
1387 verify_sequence_points (tree expr
)
1389 struct tlist
*before_sp
= 0, *after_sp
= 0;
1392 save_expr_cache
= 0;
1393 if (tlist_firstobj
== 0)
1395 gcc_obstack_init (&tlist_obstack
);
1396 tlist_firstobj
= (char *) obstack_alloc (&tlist_obstack
, 0);
1399 verify_tree (expr
, &before_sp
, &after_sp
, 0);
1400 warn_for_collisions (after_sp
);
1401 obstack_free (&tlist_obstack
, tlist_firstobj
);
1404 /* Validate the expression after `case' and apply default promotions. */
1407 check_case_value (tree value
)
1409 if (value
== NULL_TREE
)
1412 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
1413 STRIP_TYPE_NOPS (value
);
1414 /* In C++, the following is allowed:
1417 switch (...) { case i: ... }
1419 So, we try to reduce the VALUE to a constant that way. */
1420 if (c_dialect_cxx ())
1422 value
= decl_constant_value (value
);
1423 STRIP_TYPE_NOPS (value
);
1424 value
= fold (value
);
1427 if (TREE_CODE (value
) != INTEGER_CST
1428 && value
!= error_mark_node
)
1430 error ("case label does not reduce to an integer constant");
1431 value
= error_mark_node
;
1434 /* Promote char or short to int. */
1435 value
= default_conversion (value
);
1437 constant_expression_warning (value
);
1442 /* See if the case values LOW and HIGH are in the range of the original
1443 type (ie. before the default conversion to int) of the switch testing
1445 TYPE is the promoted type of the testing expression, and ORIG_TYPE is
1446 the type before promiting it. CASE_LOW_P is a pointer to the lower
1447 bound of the case label, and CASE_HIGH_P is the upper bound or NULL
1448 if the case is not a case range.
1449 The caller has to make sure that we are not called with NULL for
1450 CASE_LOW_P (ie. the defualt case).
1451 Returns true if the case label is in range of ORIG_TYPE (satured or
1452 untouched) or false if the label is out of range. */
1455 check_case_bounds (tree type
, tree orig_type
,
1456 tree
*case_low_p
, tree
*case_high_p
)
1458 tree min_value
, max_value
;
1459 tree case_low
= *case_low_p
;
1460 tree case_high
= case_high_p
? *case_high_p
: case_low
;
1462 /* If there was a problem with the original type, do nothing. */
1463 if (orig_type
== error_mark_node
)
1466 min_value
= TYPE_MIN_VALUE (orig_type
);
1467 max_value
= TYPE_MAX_VALUE (orig_type
);
1469 /* Case label is less than minimum for type. */
1470 if (tree_int_cst_compare (case_low
, min_value
) < 0
1471 && tree_int_cst_compare (case_high
, min_value
) < 0)
1473 warning ("case label value is less than minimum value for type");
1477 /* Case value is greater than maximum for type. */
1478 if (tree_int_cst_compare (case_low
, max_value
) > 0
1479 && tree_int_cst_compare (case_high
, max_value
) > 0)
1481 warning ("case label value exceeds maximum value for type");
1485 /* Saturate lower case label value to minimum. */
1486 if (tree_int_cst_compare (case_high
, min_value
) >= 0
1487 && tree_int_cst_compare (case_low
, min_value
) < 0)
1489 warning ("lower value in case label range"
1490 " less than minimum value for type");
1491 case_low
= min_value
;
1494 /* Saturate upper case label value to maximum. */
1495 if (tree_int_cst_compare (case_low
, max_value
) <= 0
1496 && tree_int_cst_compare (case_high
, max_value
) > 0)
1498 warning ("upper value in case label range"
1499 " exceeds maximum value for type");
1500 case_high
= max_value
;
1503 if (*case_low_p
!= case_low
)
1504 *case_low_p
= convert (type
, case_low
);
1505 if (case_high_p
&& *case_high_p
!= case_high
)
1506 *case_high_p
= convert (type
, case_high
);
1511 /* Return an integer type with BITS bits of precision,
1512 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
1515 c_common_type_for_size (unsigned int bits
, int unsignedp
)
1517 if (bits
== TYPE_PRECISION (integer_type_node
))
1518 return unsignedp
? unsigned_type_node
: integer_type_node
;
1520 if (bits
== TYPE_PRECISION (signed_char_type_node
))
1521 return unsignedp
? unsigned_char_type_node
: signed_char_type_node
;
1523 if (bits
== TYPE_PRECISION (short_integer_type_node
))
1524 return unsignedp
? short_unsigned_type_node
: short_integer_type_node
;
1526 if (bits
== TYPE_PRECISION (long_integer_type_node
))
1527 return unsignedp
? long_unsigned_type_node
: long_integer_type_node
;
1529 if (bits
== TYPE_PRECISION (long_long_integer_type_node
))
1530 return (unsignedp
? long_long_unsigned_type_node
1531 : long_long_integer_type_node
);
1533 if (bits
== TYPE_PRECISION (widest_integer_literal_type_node
))
1534 return (unsignedp
? widest_unsigned_literal_type_node
1535 : widest_integer_literal_type_node
);
1537 if (bits
<= TYPE_PRECISION (intQI_type_node
))
1538 return unsignedp
? unsigned_intQI_type_node
: intQI_type_node
;
1540 if (bits
<= TYPE_PRECISION (intHI_type_node
))
1541 return unsignedp
? unsigned_intHI_type_node
: intHI_type_node
;
1543 if (bits
<= TYPE_PRECISION (intSI_type_node
))
1544 return unsignedp
? unsigned_intSI_type_node
: intSI_type_node
;
1546 if (bits
<= TYPE_PRECISION (intDI_type_node
))
1547 return unsignedp
? unsigned_intDI_type_node
: intDI_type_node
;
1552 /* Used for communication between c_common_type_for_mode and
1553 c_register_builtin_type. */
1554 static GTY(()) tree registered_builtin_types
;
1556 /* Return a data type that has machine mode MODE.
1557 If the mode is an integer,
1558 then UNSIGNEDP selects between signed and unsigned types. */
1561 c_common_type_for_mode (enum machine_mode mode
, int unsignedp
)
1565 if (mode
== TYPE_MODE (integer_type_node
))
1566 return unsignedp
? unsigned_type_node
: integer_type_node
;
1568 if (mode
== TYPE_MODE (signed_char_type_node
))
1569 return unsignedp
? unsigned_char_type_node
: signed_char_type_node
;
1571 if (mode
== TYPE_MODE (short_integer_type_node
))
1572 return unsignedp
? short_unsigned_type_node
: short_integer_type_node
;
1574 if (mode
== TYPE_MODE (long_integer_type_node
))
1575 return unsignedp
? long_unsigned_type_node
: long_integer_type_node
;
1577 if (mode
== TYPE_MODE (long_long_integer_type_node
))
1578 return unsignedp
? long_long_unsigned_type_node
: long_long_integer_type_node
;
1580 if (mode
== TYPE_MODE (widest_integer_literal_type_node
))
1581 return unsignedp
? widest_unsigned_literal_type_node
1582 : widest_integer_literal_type_node
;
1585 return unsignedp
? unsigned_intQI_type_node
: intQI_type_node
;
1588 return unsignedp
? unsigned_intHI_type_node
: intHI_type_node
;
1591 return unsignedp
? unsigned_intSI_type_node
: intSI_type_node
;
1594 return unsignedp
? unsigned_intDI_type_node
: intDI_type_node
;
1596 #if HOST_BITS_PER_WIDE_INT >= 64
1597 if (mode
== TYPE_MODE (intTI_type_node
))
1598 return unsignedp
? unsigned_intTI_type_node
: intTI_type_node
;
1601 if (mode
== TYPE_MODE (float_type_node
))
1602 return float_type_node
;
1604 if (mode
== TYPE_MODE (double_type_node
))
1605 return double_type_node
;
1607 if (mode
== TYPE_MODE (long_double_type_node
))
1608 return long_double_type_node
;
1610 if (mode
== TYPE_MODE (void_type_node
))
1611 return void_type_node
;
1613 if (mode
== TYPE_MODE (build_pointer_type (char_type_node
)))
1614 return unsignedp
? make_unsigned_type (mode
) : make_signed_type (mode
);
1616 if (mode
== TYPE_MODE (build_pointer_type (integer_type_node
)))
1617 return unsignedp
? make_unsigned_type (mode
) : make_signed_type (mode
);
1619 if (VECTOR_MODE_P (mode
))
1621 enum machine_mode inner_mode
= GET_MODE_INNER (mode
);
1622 tree inner_type
= c_common_type_for_mode (inner_mode
, unsignedp
);
1623 if (inner_type
!= NULL_TREE
)
1624 return build_vector_type_for_mode (inner_type
, mode
);
1627 for (t
= registered_builtin_types
; t
; t
= TREE_CHAIN (t
))
1628 if (TYPE_MODE (TREE_VALUE (t
)) == mode
)
1629 return TREE_VALUE (t
);
1634 /* Return an unsigned type the same as TYPE in other respects. */
1636 c_common_unsigned_type (tree type
)
1638 tree type1
= TYPE_MAIN_VARIANT (type
);
1639 if (type1
== signed_char_type_node
|| type1
== char_type_node
)
1640 return unsigned_char_type_node
;
1641 if (type1
== integer_type_node
)
1642 return unsigned_type_node
;
1643 if (type1
== short_integer_type_node
)
1644 return short_unsigned_type_node
;
1645 if (type1
== long_integer_type_node
)
1646 return long_unsigned_type_node
;
1647 if (type1
== long_long_integer_type_node
)
1648 return long_long_unsigned_type_node
;
1649 if (type1
== widest_integer_literal_type_node
)
1650 return widest_unsigned_literal_type_node
;
1651 #if HOST_BITS_PER_WIDE_INT >= 64
1652 if (type1
== intTI_type_node
)
1653 return unsigned_intTI_type_node
;
1655 if (type1
== intDI_type_node
)
1656 return unsigned_intDI_type_node
;
1657 if (type1
== intSI_type_node
)
1658 return unsigned_intSI_type_node
;
1659 if (type1
== intHI_type_node
)
1660 return unsigned_intHI_type_node
;
1661 if (type1
== intQI_type_node
)
1662 return unsigned_intQI_type_node
;
1664 return c_common_signed_or_unsigned_type (1, type
);
1667 /* Return a signed type the same as TYPE in other respects. */
1670 c_common_signed_type (tree type
)
1672 tree type1
= TYPE_MAIN_VARIANT (type
);
1673 if (type1
== unsigned_char_type_node
|| type1
== char_type_node
)
1674 return signed_char_type_node
;
1675 if (type1
== unsigned_type_node
)
1676 return integer_type_node
;
1677 if (type1
== short_unsigned_type_node
)
1678 return short_integer_type_node
;
1679 if (type1
== long_unsigned_type_node
)
1680 return long_integer_type_node
;
1681 if (type1
== long_long_unsigned_type_node
)
1682 return long_long_integer_type_node
;
1683 if (type1
== widest_unsigned_literal_type_node
)
1684 return widest_integer_literal_type_node
;
1685 #if HOST_BITS_PER_WIDE_INT >= 64
1686 if (type1
== unsigned_intTI_type_node
)
1687 return intTI_type_node
;
1689 if (type1
== unsigned_intDI_type_node
)
1690 return intDI_type_node
;
1691 if (type1
== unsigned_intSI_type_node
)
1692 return intSI_type_node
;
1693 if (type1
== unsigned_intHI_type_node
)
1694 return intHI_type_node
;
1695 if (type1
== unsigned_intQI_type_node
)
1696 return intQI_type_node
;
1698 return c_common_signed_or_unsigned_type (0, type
);
1701 /* Return a type the same as TYPE except unsigned or
1702 signed according to UNSIGNEDP. */
1705 c_common_signed_or_unsigned_type (int unsignedp
, tree type
)
1707 if (! INTEGRAL_TYPE_P (type
)
1708 || TYPE_UNSIGNED (type
) == unsignedp
)
1711 /* For ENUMERAL_TYPEs in C++, must check the mode of the types, not
1712 the precision; they have precision set to match their range, but
1713 may use a wider mode to match an ABI. If we change modes, we may
1714 wind up with bad conversions. For INTEGER_TYPEs in C, must check
1715 the precision as well, so as to yield correct results for
1716 bit-field types. C++ does not have these separate bit-field
1717 types, and producing a signed or unsigned variant of an
1718 ENUMERAL_TYPE may cause other problems as well. */
1720 #define TYPE_OK(node) \
1721 (TYPE_MODE (type) == TYPE_MODE (node) \
1722 && (c_dialect_cxx () || TYPE_PRECISION (type) == TYPE_PRECISION (node)))
1723 if (TYPE_OK (signed_char_type_node
))
1724 return unsignedp
? unsigned_char_type_node
: signed_char_type_node
;
1725 if (TYPE_OK (integer_type_node
))
1726 return unsignedp
? unsigned_type_node
: integer_type_node
;
1727 if (TYPE_OK (short_integer_type_node
))
1728 return unsignedp
? short_unsigned_type_node
: short_integer_type_node
;
1729 if (TYPE_OK (long_integer_type_node
))
1730 return unsignedp
? long_unsigned_type_node
: long_integer_type_node
;
1731 if (TYPE_OK (long_long_integer_type_node
))
1732 return (unsignedp
? long_long_unsigned_type_node
1733 : long_long_integer_type_node
);
1734 if (TYPE_OK (widest_integer_literal_type_node
))
1735 return (unsignedp
? widest_unsigned_literal_type_node
1736 : widest_integer_literal_type_node
);
1738 #if HOST_BITS_PER_WIDE_INT >= 64
1739 if (TYPE_OK (intTI_type_node
))
1740 return unsignedp
? unsigned_intTI_type_node
: intTI_type_node
;
1742 if (TYPE_OK (intDI_type_node
))
1743 return unsignedp
? unsigned_intDI_type_node
: intDI_type_node
;
1744 if (TYPE_OK (intSI_type_node
))
1745 return unsignedp
? unsigned_intSI_type_node
: intSI_type_node
;
1746 if (TYPE_OK (intHI_type_node
))
1747 return unsignedp
? unsigned_intHI_type_node
: intHI_type_node
;
1748 if (TYPE_OK (intQI_type_node
))
1749 return unsignedp
? unsigned_intQI_type_node
: intQI_type_node
;
1752 if (c_dialect_cxx ())
1755 return build_nonstandard_integer_type (TYPE_PRECISION (type
), unsignedp
);
1758 /* The C version of the register_builtin_type langhook. */
1761 c_register_builtin_type (tree type
, const char* name
)
1765 decl
= build_decl (TYPE_DECL
, get_identifier (name
), type
);
1766 DECL_ARTIFICIAL (decl
) = 1;
1767 if (!TYPE_NAME (type
))
1768 TYPE_NAME (type
) = decl
;
1771 registered_builtin_types
= tree_cons (0, type
, registered_builtin_types
);
1775 /* Return the minimum number of bits needed to represent VALUE in a
1776 signed or unsigned type, UNSIGNEDP says which. */
1779 min_precision (tree value
, int unsignedp
)
1783 /* If the value is negative, compute its negative minus 1. The latter
1784 adjustment is because the absolute value of the largest negative value
1785 is one larger than the largest positive value. This is equivalent to
1786 a bit-wise negation, so use that operation instead. */
1788 if (tree_int_cst_sgn (value
) < 0)
1789 value
= fold (build1 (BIT_NOT_EXPR
, TREE_TYPE (value
), value
));
1791 /* Return the number of bits needed, taking into account the fact
1792 that we need one more bit for a signed than unsigned type. */
1794 if (integer_zerop (value
))
1797 log
= tree_floor_log2 (value
);
1799 return log
+ 1 + ! unsignedp
;
1802 /* Print an error message for invalid operands to arith operation
1803 CODE. NOP_EXPR is used as a special case (see
1804 c_common_truthvalue_conversion). */
1807 binary_op_error (enum tree_code code
)
1814 error ("invalid truth-value expression");
1818 opname
= "+"; break;
1820 opname
= "-"; break;
1822 opname
= "*"; break;
1824 opname
= "max"; break;
1826 opname
= "min"; break;
1828 opname
= "=="; break;
1830 opname
= "!="; break;
1832 opname
= "<="; break;
1834 opname
= ">="; break;
1836 opname
= "<"; break;
1838 opname
= ">"; break;
1840 opname
= "<<"; break;
1842 opname
= ">>"; break;
1843 case TRUNC_MOD_EXPR
:
1844 case FLOOR_MOD_EXPR
:
1845 opname
= "%"; break;
1846 case TRUNC_DIV_EXPR
:
1847 case FLOOR_DIV_EXPR
:
1848 opname
= "/"; break;
1850 opname
= "&"; break;
1852 opname
= "|"; break;
1853 case TRUTH_ANDIF_EXPR
:
1854 opname
= "&&"; break;
1855 case TRUTH_ORIF_EXPR
:
1856 opname
= "||"; break;
1858 opname
= "^"; break;
1861 opname
= "rotate"; break;
1863 opname
= "unknown"; break;
1865 error ("invalid operands to binary %s", opname
);
1868 /* Subroutine of build_binary_op, used for comparison operations.
1869 See if the operands have both been converted from subword integer types
1870 and, if so, perhaps change them both back to their original type.
1871 This function is also responsible for converting the two operands
1872 to the proper common type for comparison.
1874 The arguments of this function are all pointers to local variables
1875 of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1,
1876 RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE.
1878 If this function returns nonzero, it means that the comparison has
1879 a constant value. What this function returns is an expression for
1883 shorten_compare (tree
*op0_ptr
, tree
*op1_ptr
, tree
*restype_ptr
,
1884 enum tree_code
*rescode_ptr
)
1887 tree op0
= *op0_ptr
;
1888 tree op1
= *op1_ptr
;
1889 int unsignedp0
, unsignedp1
;
1891 tree primop0
, primop1
;
1892 enum tree_code code
= *rescode_ptr
;
1894 /* Throw away any conversions to wider types
1895 already present in the operands. */
1897 primop0
= get_narrower (op0
, &unsignedp0
);
1898 primop1
= get_narrower (op1
, &unsignedp1
);
1900 /* Handle the case that OP0 does not *contain* a conversion
1901 but it *requires* conversion to FINAL_TYPE. */
1903 if (op0
== primop0
&& TREE_TYPE (op0
) != *restype_ptr
)
1904 unsignedp0
= TYPE_UNSIGNED (TREE_TYPE (op0
));
1905 if (op1
== primop1
&& TREE_TYPE (op1
) != *restype_ptr
)
1906 unsignedp1
= TYPE_UNSIGNED (TREE_TYPE (op1
));
1908 /* If one of the operands must be floated, we cannot optimize. */
1909 real1
= TREE_CODE (TREE_TYPE (primop0
)) == REAL_TYPE
;
1910 real2
= TREE_CODE (TREE_TYPE (primop1
)) == REAL_TYPE
;
1912 /* If first arg is constant, swap the args (changing operation
1913 so value is preserved), for canonicalization. Don't do this if
1914 the second arg is 0. */
1916 if (TREE_CONSTANT (primop0
)
1917 && ! integer_zerop (primop1
) && ! real_zerop (primop1
))
1920 int temi
= unsignedp0
;
1928 unsignedp0
= unsignedp1
;
1951 *rescode_ptr
= code
;
1954 /* If comparing an integer against a constant more bits wide,
1955 maybe we can deduce a value of 1 or 0 independent of the data.
1956 Or else truncate the constant now
1957 rather than extend the variable at run time.
1959 This is only interesting if the constant is the wider arg.
1960 Also, it is not safe if the constant is unsigned and the
1961 variable arg is signed, since in this case the variable
1962 would be sign-extended and then regarded as unsigned.
1963 Our technique fails in this case because the lowest/highest
1964 possible unsigned results don't follow naturally from the
1965 lowest/highest possible values of the variable operand.
1966 For just EQ_EXPR and NE_EXPR there is another technique that
1967 could be used: see if the constant can be faithfully represented
1968 in the other operand's type, by truncating it and reextending it
1969 and see if that preserves the constant's value. */
1971 if (!real1
&& !real2
1972 && TREE_CODE (primop1
) == INTEGER_CST
1973 && TYPE_PRECISION (TREE_TYPE (primop0
)) < TYPE_PRECISION (*restype_ptr
))
1975 int min_gt
, max_gt
, min_lt
, max_lt
;
1976 tree maxval
, minval
;
1977 /* 1 if comparison is nominally unsigned. */
1978 int unsignedp
= TYPE_UNSIGNED (*restype_ptr
);
1981 type
= c_common_signed_or_unsigned_type (unsignedp0
,
1982 TREE_TYPE (primop0
));
1984 /* In C, if TYPE is an enumeration, then we need to get its
1985 min/max values from its underlying integral type, not the
1986 enumerated type itself. In C++, TYPE_MAX_VALUE and
1987 TYPE_MIN_VALUE have already been set correctly on the
1988 enumeration type. */
1989 if (!c_dialect_cxx() && TREE_CODE (type
) == ENUMERAL_TYPE
)
1990 type
= c_common_type_for_size (TYPE_PRECISION (type
), unsignedp0
);
1992 maxval
= TYPE_MAX_VALUE (type
);
1993 minval
= TYPE_MIN_VALUE (type
);
1995 if (unsignedp
&& !unsignedp0
)
1996 *restype_ptr
= c_common_signed_type (*restype_ptr
);
1998 if (TREE_TYPE (primop1
) != *restype_ptr
)
2000 tree tmp
= convert (*restype_ptr
, primop1
);
2001 TREE_OVERFLOW (tmp
) = TREE_OVERFLOW (primop1
);
2002 TREE_CONSTANT_OVERFLOW (tmp
) = TREE_CONSTANT_OVERFLOW (primop1
);
2005 if (type
!= *restype_ptr
)
2007 minval
= convert (*restype_ptr
, minval
);
2008 maxval
= convert (*restype_ptr
, maxval
);
2011 if (unsignedp
&& unsignedp0
)
2013 min_gt
= INT_CST_LT_UNSIGNED (primop1
, minval
);
2014 max_gt
= INT_CST_LT_UNSIGNED (primop1
, maxval
);
2015 min_lt
= INT_CST_LT_UNSIGNED (minval
, primop1
);
2016 max_lt
= INT_CST_LT_UNSIGNED (maxval
, primop1
);
2020 min_gt
= INT_CST_LT (primop1
, minval
);
2021 max_gt
= INT_CST_LT (primop1
, maxval
);
2022 min_lt
= INT_CST_LT (minval
, primop1
);
2023 max_lt
= INT_CST_LT (maxval
, primop1
);
2027 /* This used to be a switch, but Genix compiler can't handle that. */
2028 if (code
== NE_EXPR
)
2030 if (max_lt
|| min_gt
)
2031 val
= truthvalue_true_node
;
2033 else if (code
== EQ_EXPR
)
2035 if (max_lt
|| min_gt
)
2036 val
= truthvalue_false_node
;
2038 else if (code
== LT_EXPR
)
2041 val
= truthvalue_true_node
;
2043 val
= truthvalue_false_node
;
2045 else if (code
== GT_EXPR
)
2048 val
= truthvalue_true_node
;
2050 val
= truthvalue_false_node
;
2052 else if (code
== LE_EXPR
)
2055 val
= truthvalue_true_node
;
2057 val
= truthvalue_false_node
;
2059 else if (code
== GE_EXPR
)
2062 val
= truthvalue_true_node
;
2064 val
= truthvalue_false_node
;
2067 /* If primop0 was sign-extended and unsigned comparison specd,
2068 we did a signed comparison above using the signed type bounds.
2069 But the comparison we output must be unsigned.
2071 Also, for inequalities, VAL is no good; but if the signed
2072 comparison had *any* fixed result, it follows that the
2073 unsigned comparison just tests the sign in reverse
2074 (positive values are LE, negative ones GE).
2075 So we can generate an unsigned comparison
2076 against an extreme value of the signed type. */
2078 if (unsignedp
&& !unsignedp0
)
2085 primop1
= TYPE_MIN_VALUE (type
);
2091 primop1
= TYPE_MAX_VALUE (type
);
2098 type
= c_common_unsigned_type (type
);
2101 if (TREE_CODE (primop0
) != INTEGER_CST
)
2103 if (val
== truthvalue_false_node
)
2104 warning ("comparison is always false due to limited range of data type");
2105 if (val
== truthvalue_true_node
)
2106 warning ("comparison is always true due to limited range of data type");
2111 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
2112 if (TREE_SIDE_EFFECTS (primop0
))
2113 return build (COMPOUND_EXPR
, TREE_TYPE (val
), primop0
, val
);
2117 /* Value is not predetermined, but do the comparison
2118 in the type of the operand that is not constant.
2119 TYPE is already properly set. */
2121 else if (real1
&& real2
2122 && (TYPE_PRECISION (TREE_TYPE (primop0
))
2123 == TYPE_PRECISION (TREE_TYPE (primop1
))))
2124 type
= TREE_TYPE (primop0
);
2126 /* If args' natural types are both narrower than nominal type
2127 and both extend in the same manner, compare them
2128 in the type of the wider arg.
2129 Otherwise must actually extend both to the nominal
2130 common type lest different ways of extending
2132 (eg, (short)-1 == (unsigned short)-1 should be 0.) */
2134 else if (unsignedp0
== unsignedp1
&& real1
== real2
2135 && TYPE_PRECISION (TREE_TYPE (primop0
)) < TYPE_PRECISION (*restype_ptr
)
2136 && TYPE_PRECISION (TREE_TYPE (primop1
)) < TYPE_PRECISION (*restype_ptr
))
2138 type
= common_type (TREE_TYPE (primop0
), TREE_TYPE (primop1
));
2139 type
= c_common_signed_or_unsigned_type (unsignedp0
2140 || TYPE_UNSIGNED (*restype_ptr
),
2142 /* Make sure shorter operand is extended the right way
2143 to match the longer operand. */
2145 = convert (c_common_signed_or_unsigned_type (unsignedp0
,
2146 TREE_TYPE (primop0
)),
2149 = convert (c_common_signed_or_unsigned_type (unsignedp1
,
2150 TREE_TYPE (primop1
)),
2155 /* Here we must do the comparison on the nominal type
2156 using the args exactly as we received them. */
2157 type
= *restype_ptr
;
2161 if (!real1
&& !real2
&& integer_zerop (primop1
)
2162 && TYPE_UNSIGNED (*restype_ptr
))
2168 /* All unsigned values are >= 0, so we warn if extra warnings
2169 are requested. However, if OP0 is a constant that is
2170 >= 0, the signedness of the comparison isn't an issue,
2171 so suppress the warning. */
2172 if (extra_warnings
&& !in_system_header
2173 && ! (TREE_CODE (primop0
) == INTEGER_CST
2174 && ! TREE_OVERFLOW (convert (c_common_signed_type (type
),
2176 warning ("comparison of unsigned expression >= 0 is always true");
2177 value
= truthvalue_true_node
;
2181 if (extra_warnings
&& !in_system_header
2182 && ! (TREE_CODE (primop0
) == INTEGER_CST
2183 && ! TREE_OVERFLOW (convert (c_common_signed_type (type
),
2185 warning ("comparison of unsigned expression < 0 is always false");
2186 value
= truthvalue_false_node
;
2195 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
2196 if (TREE_SIDE_EFFECTS (primop0
))
2197 return build (COMPOUND_EXPR
, TREE_TYPE (value
),
2204 *op0_ptr
= convert (type
, primop0
);
2205 *op1_ptr
= convert (type
, primop1
);
2207 *restype_ptr
= truthvalue_type_node
;
2212 /* Return a tree for the sum or difference (RESULTCODE says which)
2213 of pointer PTROP and integer INTOP. */
2216 pointer_int_sum (enum tree_code resultcode
, tree ptrop
, tree intop
)
2220 /* The result is a pointer of the same type that is being added. */
2222 tree result_type
= TREE_TYPE (ptrop
);
2224 if (TREE_CODE (TREE_TYPE (result_type
)) == VOID_TYPE
)
2226 if (pedantic
|| warn_pointer_arith
)
2227 pedwarn ("pointer of type `void *' used in arithmetic");
2228 size_exp
= integer_one_node
;
2230 else if (TREE_CODE (TREE_TYPE (result_type
)) == FUNCTION_TYPE
)
2232 if (pedantic
|| warn_pointer_arith
)
2233 pedwarn ("pointer to a function used in arithmetic");
2234 size_exp
= integer_one_node
;
2236 else if (TREE_CODE (TREE_TYPE (result_type
)) == METHOD_TYPE
)
2238 if (pedantic
|| warn_pointer_arith
)
2239 pedwarn ("pointer to member function used in arithmetic");
2240 size_exp
= integer_one_node
;
2243 size_exp
= size_in_bytes (TREE_TYPE (result_type
));
2245 /* If what we are about to multiply by the size of the elements
2246 contains a constant term, apply distributive law
2247 and multiply that constant term separately.
2248 This helps produce common subexpressions. */
2250 if ((TREE_CODE (intop
) == PLUS_EXPR
|| TREE_CODE (intop
) == MINUS_EXPR
)
2251 && ! TREE_CONSTANT (intop
)
2252 && TREE_CONSTANT (TREE_OPERAND (intop
, 1))
2253 && TREE_CONSTANT (size_exp
)
2254 /* If the constant comes from pointer subtraction,
2255 skip this optimization--it would cause an error. */
2256 && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop
, 0))) == INTEGER_TYPE
2257 /* If the constant is unsigned, and smaller than the pointer size,
2258 then we must skip this optimization. This is because it could cause
2259 an overflow error if the constant is negative but INTOP is not. */
2260 && (! TYPE_UNSIGNED (TREE_TYPE (intop
))
2261 || (TYPE_PRECISION (TREE_TYPE (intop
))
2262 == TYPE_PRECISION (TREE_TYPE (ptrop
)))))
2264 enum tree_code subcode
= resultcode
;
2265 tree int_type
= TREE_TYPE (intop
);
2266 if (TREE_CODE (intop
) == MINUS_EXPR
)
2267 subcode
= (subcode
== PLUS_EXPR
? MINUS_EXPR
: PLUS_EXPR
);
2268 /* Convert both subexpression types to the type of intop,
2269 because weird cases involving pointer arithmetic
2270 can result in a sum or difference with different type args. */
2271 ptrop
= build_binary_op (subcode
, ptrop
,
2272 convert (int_type
, TREE_OPERAND (intop
, 1)), 1);
2273 intop
= convert (int_type
, TREE_OPERAND (intop
, 0));
2276 /* Convert the integer argument to a type the same size as sizetype
2277 so the multiply won't overflow spuriously. */
2279 if (TYPE_PRECISION (TREE_TYPE (intop
)) != TYPE_PRECISION (sizetype
)
2280 || TYPE_UNSIGNED (TREE_TYPE (intop
)) != TYPE_UNSIGNED (sizetype
))
2281 intop
= convert (c_common_type_for_size (TYPE_PRECISION (sizetype
),
2282 TYPE_UNSIGNED (sizetype
)), intop
);
2284 /* Replace the integer argument with a suitable product by the object size.
2285 Do this multiplication as signed, then convert to the appropriate
2286 pointer type (actually unsigned integral). */
2288 intop
= convert (result_type
,
2289 build_binary_op (MULT_EXPR
, intop
,
2290 convert (TREE_TYPE (intop
), size_exp
), 1));
2292 /* Create the sum or difference. */
2293 return fold (build (resultcode
, result_type
, ptrop
, intop
));
2296 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
2297 or validate its data type for an `if' or `while' statement or ?..: exp.
2299 This preparation consists of taking the ordinary
2300 representation of an expression expr and producing a valid tree
2301 boolean expression describing whether expr is nonzero. We could
2302 simply always do build_binary_op (NE_EXPR, expr, truthvalue_false_node, 1),
2303 but we optimize comparisons, &&, ||, and !.
2305 The resulting type should always be `truthvalue_type_node'. */
2308 c_common_truthvalue_conversion (tree expr
)
2310 if (TREE_CODE (expr
) == ERROR_MARK
)
2313 if (TREE_CODE (expr
) == FUNCTION_DECL
)
2314 expr
= build_unary_op (ADDR_EXPR
, expr
, 0);
2316 switch (TREE_CODE (expr
))
2318 case EQ_EXPR
: case NE_EXPR
: case UNEQ_EXPR
: case LTGT_EXPR
:
2319 case LE_EXPR
: case GE_EXPR
: case LT_EXPR
: case GT_EXPR
:
2320 case UNLE_EXPR
: case UNGE_EXPR
: case UNLT_EXPR
: case UNGT_EXPR
:
2321 case ORDERED_EXPR
: case UNORDERED_EXPR
:
2322 case TRUTH_ANDIF_EXPR
:
2323 case TRUTH_ORIF_EXPR
:
2324 case TRUTH_AND_EXPR
:
2326 case TRUTH_XOR_EXPR
:
2327 case TRUTH_NOT_EXPR
:
2328 TREE_TYPE (expr
) = truthvalue_type_node
;
2335 return integer_zerop (expr
) ? truthvalue_false_node
: truthvalue_true_node
;
2338 return real_zerop (expr
) ? truthvalue_false_node
: truthvalue_true_node
;
2342 if (TREE_CODE (TREE_OPERAND (expr
, 0)) == FUNCTION_DECL
2343 && ! DECL_WEAK (TREE_OPERAND (expr
, 0)))
2345 /* Common Ada/Pascal programmer's mistake. We always warn
2346 about this since it is so bad. */
2347 warning ("the address of `%D', will always evaluate as `true'",
2348 TREE_OPERAND (expr
, 0));
2349 return truthvalue_true_node
;
2352 /* If we are taking the address of an external decl, it might be
2353 zero if it is weak, so we cannot optimize. */
2354 if (DECL_P (TREE_OPERAND (expr
, 0))
2355 && DECL_EXTERNAL (TREE_OPERAND (expr
, 0)))
2358 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr
, 0)))
2359 return build (COMPOUND_EXPR
, truthvalue_type_node
,
2360 TREE_OPERAND (expr
, 0), truthvalue_true_node
);
2362 return truthvalue_true_node
;
2366 return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr
, 1))
2367 ? TRUTH_OR_EXPR
: TRUTH_ORIF_EXPR
),
2368 lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 0)),
2369 lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 1)),
2375 /* These don't change whether an object is nonzero or zero. */
2376 return lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 0));
2380 /* These don't change whether an object is zero or nonzero, but
2381 we can't ignore them if their second arg has side-effects. */
2382 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr
, 1)))
2383 return build (COMPOUND_EXPR
, truthvalue_type_node
, TREE_OPERAND (expr
, 1),
2384 lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 0)));
2386 return lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 0));
2389 /* Distribute the conversion into the arms of a COND_EXPR. */
2390 return fold (build (COND_EXPR
, truthvalue_type_node
, TREE_OPERAND (expr
, 0),
2391 lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 1)),
2392 lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 2))));
2395 /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE,
2396 since that affects how `default_conversion' will behave. */
2397 if (TREE_CODE (TREE_TYPE (expr
)) == REFERENCE_TYPE
2398 || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr
, 0))) == REFERENCE_TYPE
)
2400 /* Fall through.... */
2402 /* If this is widening the argument, we can ignore it. */
2403 if (TYPE_PRECISION (TREE_TYPE (expr
))
2404 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr
, 0))))
2405 return lang_hooks
.truthvalue_conversion (TREE_OPERAND (expr
, 0));
2409 /* Perhaps reduce (x - y) != 0 to (x != y). The expressions
2410 aren't guaranteed to the be same for modes that can represent
2411 infinity, since if x and y are both +infinity, or both
2412 -infinity, then x - y is not a number.
2414 Note that this transformation is safe when x or y is NaN.
2415 (x - y) is then NaN, and both (x - y) != 0 and x != y will
2417 if (HONOR_INFINITIES (TYPE_MODE (TREE_TYPE (TREE_OPERAND (expr
, 0)))))
2419 /* Fall through.... */
2421 /* This and MINUS_EXPR can be changed into a comparison of the
2423 if (TREE_TYPE (TREE_OPERAND (expr
, 0))
2424 == TREE_TYPE (TREE_OPERAND (expr
, 1)))
2425 return build_binary_op (NE_EXPR
, TREE_OPERAND (expr
, 0),
2426 TREE_OPERAND (expr
, 1), 1);
2427 return build_binary_op (NE_EXPR
, TREE_OPERAND (expr
, 0),
2428 fold (build1 (NOP_EXPR
,
2429 TREE_TYPE (TREE_OPERAND (expr
, 0)),
2430 TREE_OPERAND (expr
, 1))), 1);
2433 if (integer_onep (TREE_OPERAND (expr
, 1))
2434 && TREE_TYPE (expr
) != truthvalue_type_node
)
2435 /* Using convert here would cause infinite recursion. */
2436 return build1 (NOP_EXPR
, truthvalue_type_node
, expr
);
2440 if (warn_parentheses
&& !TREE_NO_WARNING (expr
))
2441 warning ("suggest parentheses around assignment used as truth value");
2448 if (TREE_CODE (TREE_TYPE (expr
)) == COMPLEX_TYPE
)
2450 tree t
= save_expr (expr
);
2451 return (build_binary_op
2452 ((TREE_SIDE_EFFECTS (expr
)
2453 ? TRUTH_OR_EXPR
: TRUTH_ORIF_EXPR
),
2454 lang_hooks
.truthvalue_conversion (build_unary_op (REALPART_EXPR
, t
, 0)),
2455 lang_hooks
.truthvalue_conversion (build_unary_op (IMAGPART_EXPR
, t
, 0)),
2459 return build_binary_op (NE_EXPR
, expr
, integer_zero_node
, 1);
2462 static tree
builtin_function_2 (const char *builtin_name
, const char *name
,
2463 tree builtin_type
, tree type
,
2464 enum built_in_function function_code
,
2465 enum built_in_class cl
, int library_name_p
,
2469 /* Make a variant type in the proper way for C/C++, propagating qualifiers
2470 down to the element type of an array. */
2473 c_build_qualified_type (tree type
, int type_quals
)
2475 if (type
== error_mark_node
)
2478 if (TREE_CODE (type
) == ARRAY_TYPE
)
2479 return build_array_type (c_build_qualified_type (TREE_TYPE (type
),
2481 TYPE_DOMAIN (type
));
2483 /* A restrict-qualified pointer type must be a pointer to object or
2484 incomplete type. Note that the use of POINTER_TYPE_P also allows
2485 REFERENCE_TYPEs, which is appropriate for C++. */
2486 if ((type_quals
& TYPE_QUAL_RESTRICT
)
2487 && (!POINTER_TYPE_P (type
)
2488 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type
))))
2490 error ("invalid use of `restrict'");
2491 type_quals
&= ~TYPE_QUAL_RESTRICT
;
2494 return build_qualified_type (type
, type_quals
);
2497 /* Apply the TYPE_QUALS to the new DECL. */
2500 c_apply_type_quals_to_decl (int type_quals
, tree decl
)
2502 tree type
= TREE_TYPE (decl
);
2504 if (type
== error_mark_node
)
2507 if (((type_quals
& TYPE_QUAL_CONST
)
2508 || (type
&& TREE_CODE (type
) == REFERENCE_TYPE
))
2509 /* An object declared 'const' is only readonly after it is
2510 initialized. We don't have any way of expressing this currently,
2511 so we need to be conservative and unset TREE_READONLY for types
2512 with constructors. Otherwise aliasing code will ignore stores in
2513 an inline constructor. */
2514 && !(type
&& TYPE_NEEDS_CONSTRUCTING (type
)))
2515 TREE_READONLY (decl
) = 1;
2516 if (type_quals
& TYPE_QUAL_VOLATILE
)
2518 TREE_SIDE_EFFECTS (decl
) = 1;
2519 TREE_THIS_VOLATILE (decl
) = 1;
2521 if (type_quals
& TYPE_QUAL_RESTRICT
)
2523 while (type
&& TREE_CODE (type
) == ARRAY_TYPE
)
2524 /* Allow 'restrict' on arrays of pointers.
2525 FIXME currently we just ignore it. */
2526 type
= TREE_TYPE (type
);
2528 || !POINTER_TYPE_P (type
)
2529 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type
)))
2530 error ("invalid use of `restrict'");
2531 else if (flag_strict_aliasing
&& type
== TREE_TYPE (decl
))
2532 /* Indicate we need to make a unique alias set for this pointer.
2533 We can't do it here because it might be pointing to an
2535 DECL_POINTER_ALIAS_SET (decl
) = -2;
2539 /* Hash function for the problem of multiple type definitions in
2540 different files. This must hash all types that will compare
2541 equal via comptypes to the same value. In practice it hashes
2542 on some of the simple stuff and leaves the details to comptypes. */
2545 c_type_hash (const void *p
)
2551 switch (TREE_CODE (t
))
2553 /* For pointers, hash on pointee type plus some swizzling. */
2555 return c_type_hash (TREE_TYPE (t
)) ^ 0x3003003;
2556 /* Hash on number of elements and total size. */
2559 t2
= TYPE_VALUES (t
);
2563 t2
= TYPE_FIELDS (t
);
2565 case QUAL_UNION_TYPE
:
2567 t2
= TYPE_FIELDS (t
);
2571 t2
= TYPE_FIELDS (t
);
2576 for (; t2
; t2
= TREE_CHAIN (t2
))
2578 size
= TREE_INT_CST_LOW (TYPE_SIZE (t
));
2579 return ((size
<< 24) | (i
<< shift
));
2582 /* Return the typed-based alias set for T, which may be an expression
2583 or a type. Return -1 if we don't do anything special. */
2586 c_common_get_alias_set (tree t
)
2590 static htab_t type_hash_table
;
2592 /* Permit type-punning when accessing a union, provided the access
2593 is directly through the union. For example, this code does not
2594 permit taking the address of a union member and then storing
2595 through it. Even the type-punning allowed here is a GCC
2596 extension, albeit a common and useful one; the C standard says
2597 that such accesses have implementation-defined behavior. */
2599 TREE_CODE (u
) == COMPONENT_REF
|| TREE_CODE (u
) == ARRAY_REF
;
2600 u
= TREE_OPERAND (u
, 0))
2601 if (TREE_CODE (u
) == COMPONENT_REF
2602 && TREE_CODE (TREE_TYPE (TREE_OPERAND (u
, 0))) == UNION_TYPE
)
2605 /* That's all the expressions we handle specially. */
2609 /* The C standard guarantees that any object may be accessed via an
2610 lvalue that has character type. */
2611 if (t
== char_type_node
2612 || t
== signed_char_type_node
2613 || t
== unsigned_char_type_node
)
2616 /* If it has the may_alias attribute, it can alias anything. */
2617 if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (t
)))
2620 /* The C standard specifically allows aliasing between signed and
2621 unsigned variants of the same type. We treat the signed
2622 variant as canonical. */
2623 if (TREE_CODE (t
) == INTEGER_TYPE
&& TYPE_UNSIGNED (t
))
2625 tree t1
= c_common_signed_type (t
);
2627 /* t1 == t can happen for boolean nodes which are always unsigned. */
2629 return get_alias_set (t1
);
2631 else if (POINTER_TYPE_P (t
))
2635 /* Unfortunately, there is no canonical form of a pointer type.
2636 In particular, if we have `typedef int I', then `int *', and
2637 `I *' are different types. So, we have to pick a canonical
2638 representative. We do this below.
2640 Technically, this approach is actually more conservative that
2641 it needs to be. In particular, `const int *' and `int *'
2642 should be in different alias sets, according to the C and C++
2643 standard, since their types are not the same, and so,
2644 technically, an `int **' and `const int **' cannot point at
2647 But, the standard is wrong. In particular, this code is
2652 const int* const* cipp = ipp;
2654 And, it doesn't make sense for that to be legal unless you
2655 can dereference IPP and CIPP. So, we ignore cv-qualifiers on
2656 the pointed-to types. This issue has been reported to the
2658 t1
= build_type_no_quals (t
);
2660 return get_alias_set (t1
);
2663 /* Handle the case of multiple type nodes referring to "the same" type,
2664 which occurs with IMA. These share an alias set. FIXME: Currently only
2665 C90 is handled. (In C99 type compatibility is not transitive, which
2666 complicates things mightily. The alias set splay trees can theoretically
2667 represent this, but insertion is tricky when you consider all the
2668 different orders things might arrive in.) */
2670 if (c_language
!= clk_c
|| flag_isoc99
)
2673 /* Save time if there's only one input file. */
2674 if (num_in_fnames
== 1)
2677 /* Pointers need special handling if they point to any type that
2678 needs special handling (below). */
2679 if (TREE_CODE (t
) == POINTER_TYPE
)
2682 /* Find bottom type under any nested POINTERs. */
2683 for (t2
= TREE_TYPE (t
);
2684 TREE_CODE (t2
) == POINTER_TYPE
;
2685 t2
= TREE_TYPE (t2
))
2687 if (TREE_CODE (t2
) != RECORD_TYPE
2688 && TREE_CODE (t2
) != ENUMERAL_TYPE
2689 && TREE_CODE (t2
) != QUAL_UNION_TYPE
2690 && TREE_CODE (t2
) != UNION_TYPE
)
2692 if (TYPE_SIZE (t2
) == 0)
2695 /* These are the only cases that need special handling. */
2696 if (TREE_CODE (t
) != RECORD_TYPE
2697 && TREE_CODE (t
) != ENUMERAL_TYPE
2698 && TREE_CODE (t
) != QUAL_UNION_TYPE
2699 && TREE_CODE (t
) != UNION_TYPE
2700 && TREE_CODE (t
) != POINTER_TYPE
)
2703 if (TYPE_SIZE (t
) == 0)
2706 /* Look up t in hash table. Only one of the compatible types within each
2707 alias set is recorded in the table. */
2708 if (!type_hash_table
)
2709 type_hash_table
= htab_create (1021, c_type_hash
,
2710 (htab_eq
) lang_hooks
.types_compatible_p
,
2712 slot
= htab_find_slot (type_hash_table
, t
, INSERT
);
2715 TYPE_ALIAS_SET (t
) = TYPE_ALIAS_SET ((tree
)*slot
);
2716 return TYPE_ALIAS_SET ((tree
)*slot
);
2719 /* Our caller will assign and record (in t) a new alias set; all we need
2720 to do is remember t in the hash table. */
2726 /* Compute the value of 'sizeof (TYPE)' or '__alignof__ (TYPE)', where the
2727 second parameter indicates which OPERATOR is being applied. The COMPLAIN
2728 flag controls whether we should diagnose possibly ill-formed
2729 constructs or not. */
2731 c_sizeof_or_alignof_type (tree type
, enum tree_code op
, int complain
)
2733 const char *op_name
;
2735 enum tree_code type_code
= TREE_CODE (type
);
2737 my_friendly_assert (op
== SIZEOF_EXPR
|| op
== ALIGNOF_EXPR
, 20020720);
2738 op_name
= op
== SIZEOF_EXPR
? "sizeof" : "__alignof__";
2740 if (type_code
== FUNCTION_TYPE
)
2742 if (op
== SIZEOF_EXPR
)
2744 if (complain
&& (pedantic
|| warn_pointer_arith
))
2745 pedwarn ("invalid application of `sizeof' to a function type");
2746 value
= size_one_node
;
2749 value
= size_int (FUNCTION_BOUNDARY
/ BITS_PER_UNIT
);
2751 else if (type_code
== VOID_TYPE
|| type_code
== ERROR_MARK
)
2753 if (type_code
== VOID_TYPE
2754 && complain
&& (pedantic
|| warn_pointer_arith
))
2755 pedwarn ("invalid application of `%s' to a void type", op_name
);
2756 value
= size_one_node
;
2758 else if (!COMPLETE_TYPE_P (type
))
2761 error ("invalid application of `%s' to incomplete type `%T' ",
2763 value
= size_zero_node
;
2767 if (op
== (enum tree_code
) SIZEOF_EXPR
)
2768 /* Convert in case a char is more than one unit. */
2769 value
= size_binop (CEIL_DIV_EXPR
, TYPE_SIZE_UNIT (type
),
2770 size_int (TYPE_PRECISION (char_type_node
)
2773 value
= size_int (TYPE_ALIGN (type
) / BITS_PER_UNIT
);
2776 /* VALUE will have an integer type with TYPE_IS_SIZETYPE set.
2777 TYPE_IS_SIZETYPE means that certain things (like overflow) will
2778 never happen. However, this node should really have type
2779 `size_t', which is just a typedef for an ordinary integer type. */
2780 value
= fold (build1 (NOP_EXPR
, size_type_node
, value
));
2781 my_friendly_assert (!TYPE_IS_SIZETYPE (TREE_TYPE (value
)), 20001021);
2786 /* Implement the __alignof keyword: Return the minimum required
2787 alignment of EXPR, measured in bytes. For VAR_DECL's and
2788 FIELD_DECL's return DECL_ALIGN (which can be set from an
2789 "aligned" __attribute__ specification). */
2792 c_alignof_expr (tree expr
)
2796 if (TREE_CODE (expr
) == VAR_DECL
)
2797 t
= size_int (DECL_ALIGN (expr
) / BITS_PER_UNIT
);
2799 else if (TREE_CODE (expr
) == COMPONENT_REF
2800 && DECL_C_BIT_FIELD (TREE_OPERAND (expr
, 1)))
2802 error ("`__alignof' applied to a bit-field");
2805 else if (TREE_CODE (expr
) == COMPONENT_REF
2806 && TREE_CODE (TREE_OPERAND (expr
, 1)) == FIELD_DECL
)
2807 t
= size_int (DECL_ALIGN (TREE_OPERAND (expr
, 1)) / BITS_PER_UNIT
);
2809 else if (TREE_CODE (expr
) == INDIRECT_REF
)
2811 tree t
= TREE_OPERAND (expr
, 0);
2813 int bestalign
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t
)));
2815 while (TREE_CODE (t
) == NOP_EXPR
2816 && TREE_CODE (TREE_TYPE (TREE_OPERAND (t
, 0))) == POINTER_TYPE
)
2820 t
= TREE_OPERAND (t
, 0);
2821 thisalign
= TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t
)));
2822 if (thisalign
> bestalign
)
2823 best
= t
, bestalign
= thisalign
;
2825 return c_alignof (TREE_TYPE (TREE_TYPE (best
)));
2828 return c_alignof (TREE_TYPE (expr
));
2830 return fold (build1 (NOP_EXPR
, size_type_node
, t
));
2833 /* Handle C and C++ default attributes. */
2835 enum built_in_attribute
2837 #define DEF_ATTR_NULL_TREE(ENUM) ENUM,
2838 #define DEF_ATTR_INT(ENUM, VALUE) ENUM,
2839 #define DEF_ATTR_IDENT(ENUM, STRING) ENUM,
2840 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM,
2841 #include "builtin-attrs.def"
2842 #undef DEF_ATTR_NULL_TREE
2844 #undef DEF_ATTR_IDENT
2845 #undef DEF_ATTR_TREE_LIST
2849 static GTY(()) tree built_in_attributes
[(int) ATTR_LAST
];
2851 static void c_init_attributes (void);
2853 /* Build tree nodes and builtin functions common to both C and C++ language
2857 c_common_nodes_and_builtins (void)
2861 #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME,
2862 #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME,
2863 #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME,
2864 #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME,
2865 #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
2866 #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
2867 #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME,
2868 #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME,
2869 #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME,
2870 #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
2871 #define DEF_POINTER_TYPE(NAME, TYPE) NAME,
2872 #include "builtin-types.def"
2873 #undef DEF_PRIMITIVE_TYPE
2874 #undef DEF_FUNCTION_TYPE_0
2875 #undef DEF_FUNCTION_TYPE_1
2876 #undef DEF_FUNCTION_TYPE_2
2877 #undef DEF_FUNCTION_TYPE_3
2878 #undef DEF_FUNCTION_TYPE_4
2879 #undef DEF_FUNCTION_TYPE_VAR_0
2880 #undef DEF_FUNCTION_TYPE_VAR_1
2881 #undef DEF_FUNCTION_TYPE_VAR_2
2882 #undef DEF_FUNCTION_TYPE_VAR_3
2883 #undef DEF_POINTER_TYPE
2887 typedef enum builtin_type builtin_type
;
2889 tree builtin_types
[(int) BT_LAST
];
2890 int wchar_type_size
;
2891 tree array_domain_type
;
2892 tree va_list_ref_type_node
;
2893 tree va_list_arg_type_node
;
2895 /* Define `int' and `char' first so that dbx will output them first. */
2896 record_builtin_type (RID_INT
, NULL
, integer_type_node
);
2897 record_builtin_type (RID_CHAR
, "char", char_type_node
);
2899 /* `signed' is the same as `int'. FIXME: the declarations of "signed",
2900 "unsigned long", "long long unsigned" and "unsigned short" were in C++
2901 but not C. Are the conditionals here needed? */
2902 if (c_dialect_cxx ())
2903 record_builtin_type (RID_SIGNED
, NULL
, integer_type_node
);
2904 record_builtin_type (RID_LONG
, "long int", long_integer_type_node
);
2905 record_builtin_type (RID_UNSIGNED
, "unsigned int", unsigned_type_node
);
2906 record_builtin_type (RID_MAX
, "long unsigned int",
2907 long_unsigned_type_node
);
2908 if (c_dialect_cxx ())
2909 record_builtin_type (RID_MAX
, "unsigned long", long_unsigned_type_node
);
2910 record_builtin_type (RID_MAX
, "long long int",
2911 long_long_integer_type_node
);
2912 record_builtin_type (RID_MAX
, "long long unsigned int",
2913 long_long_unsigned_type_node
);
2914 if (c_dialect_cxx ())
2915 record_builtin_type (RID_MAX
, "long long unsigned",
2916 long_long_unsigned_type_node
);
2917 record_builtin_type (RID_SHORT
, "short int", short_integer_type_node
);
2918 record_builtin_type (RID_MAX
, "short unsigned int",
2919 short_unsigned_type_node
);
2920 if (c_dialect_cxx ())
2921 record_builtin_type (RID_MAX
, "unsigned short",
2922 short_unsigned_type_node
);
2924 /* Define both `signed char' and `unsigned char'. */
2925 record_builtin_type (RID_MAX
, "signed char", signed_char_type_node
);
2926 record_builtin_type (RID_MAX
, "unsigned char", unsigned_char_type_node
);
2928 /* These are types that c_common_type_for_size and
2929 c_common_type_for_mode use. */
2930 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2932 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2934 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2936 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2938 #if HOST_BITS_PER_WIDE_INT >= 64
2939 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
,
2940 get_identifier ("__int128_t"),
2943 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2944 unsigned_intQI_type_node
));
2945 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2946 unsigned_intHI_type_node
));
2947 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2948 unsigned_intSI_type_node
));
2949 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2950 unsigned_intDI_type_node
));
2951 #if HOST_BITS_PER_WIDE_INT >= 64
2952 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
,
2953 get_identifier ("__uint128_t"),
2954 unsigned_intTI_type_node
));
2957 /* Create the widest literal types. */
2958 widest_integer_literal_type_node
2959 = make_signed_type (HOST_BITS_PER_WIDE_INT
* 2);
2960 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2961 widest_integer_literal_type_node
));
2963 widest_unsigned_literal_type_node
2964 = make_unsigned_type (HOST_BITS_PER_WIDE_INT
* 2);
2965 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
2966 widest_unsigned_literal_type_node
));
2968 /* `unsigned long' is the standard type for sizeof.
2969 Note that stddef.h uses `unsigned long',
2970 and this must agree, even if long and int are the same size. */
2972 TREE_TYPE (identifier_global_value (get_identifier (SIZE_TYPE
)));
2973 signed_size_type_node
= c_common_signed_type (size_type_node
);
2974 set_sizetype (size_type_node
);
2977 TREE_TYPE (identifier_global_value (get_identifier (PID_TYPE
)));
2979 build_common_tree_nodes_2 (flag_short_double
);
2981 record_builtin_type (RID_FLOAT
, NULL
, float_type_node
);
2982 record_builtin_type (RID_DOUBLE
, NULL
, double_type_node
);
2983 record_builtin_type (RID_MAX
, "long double", long_double_type_node
);
2985 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
,
2986 get_identifier ("complex int"),
2987 complex_integer_type_node
));
2988 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
,
2989 get_identifier ("complex float"),
2990 complex_float_type_node
));
2991 lang_hooks
.decls
.pushdecl (build_decl (TYPE_DECL
,
2992 get_identifier ("complex double"),
2993 complex_double_type_node
));
2994 lang_hooks
.decls
.pushdecl
2995 (build_decl (TYPE_DECL
, get_identifier ("complex long double"),
2996 complex_long_double_type_node
));
2998 if (c_dialect_cxx ())
2999 /* For C++, make fileptr_type_node a distinct void * type until
3000 FILE type is defined. */
3001 fileptr_type_node
= build_type_copy (ptr_type_node
);
3003 record_builtin_type (RID_VOID
, NULL
, void_type_node
);
3005 void_zero_node
= build_int_2 (0, 0);
3006 TREE_TYPE (void_zero_node
) = void_type_node
;
3008 void_list_node
= build_void_list_node ();
3010 /* Make a type to be the domain of a few array types
3011 whose domains don't really matter.
3012 200 is small enough that it always fits in size_t
3013 and large enough that it can hold most function names for the
3014 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3015 array_domain_type
= build_index_type (size_int (200));
3017 /* Make a type for arrays of characters.
3018 With luck nothing will ever really depend on the length of this
3020 char_array_type_node
3021 = build_array_type (char_type_node
, array_domain_type
);
3023 /* Likewise for arrays of ints. */
3025 = build_array_type (integer_type_node
, array_domain_type
);
3027 string_type_node
= build_pointer_type (char_type_node
);
3028 const_string_type_node
3029 = build_pointer_type (build_qualified_type
3030 (char_type_node
, TYPE_QUAL_CONST
));
3032 /* This is special for C++ so functions can be overloaded. */
3033 wchar_type_node
= get_identifier (MODIFIED_WCHAR_TYPE
);
3034 wchar_type_node
= TREE_TYPE (identifier_global_value (wchar_type_node
));
3035 wchar_type_size
= TYPE_PRECISION (wchar_type_node
);
3036 if (c_dialect_cxx ())
3038 if (TYPE_UNSIGNED (wchar_type_node
))
3039 wchar_type_node
= make_unsigned_type (wchar_type_size
);
3041 wchar_type_node
= make_signed_type (wchar_type_size
);
3042 record_builtin_type (RID_WCHAR
, "wchar_t", wchar_type_node
);
3046 signed_wchar_type_node
= c_common_signed_type (wchar_type_node
);
3047 unsigned_wchar_type_node
= c_common_unsigned_type (wchar_type_node
);
3050 /* This is for wide string constants. */
3051 wchar_array_type_node
3052 = build_array_type (wchar_type_node
, array_domain_type
);
3055 TREE_TYPE (identifier_global_value (get_identifier (WINT_TYPE
)));
3058 TREE_TYPE (identifier_global_value (get_identifier (INTMAX_TYPE
)));
3060 TREE_TYPE (identifier_global_value (get_identifier (UINTMAX_TYPE
)));
3062 default_function_type
= build_function_type (integer_type_node
, NULL_TREE
);
3064 = TREE_TYPE (identifier_global_value (get_identifier (PTRDIFF_TYPE
)));
3065 unsigned_ptrdiff_type_node
= c_common_unsigned_type (ptrdiff_type_node
);
3067 lang_hooks
.decls
.pushdecl
3068 (build_decl (TYPE_DECL
, get_identifier ("__builtin_va_list"),
3069 va_list_type_node
));
3071 if (TREE_CODE (va_list_type_node
) == ARRAY_TYPE
)
3073 va_list_arg_type_node
= va_list_ref_type_node
=
3074 build_pointer_type (TREE_TYPE (va_list_type_node
));
3078 va_list_arg_type_node
= va_list_type_node
;
3079 va_list_ref_type_node
= build_reference_type (va_list_type_node
);
3082 #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \
3083 builtin_types[(int) ENUM] = VALUE;
3084 #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \
3085 builtin_types[(int) ENUM] \
3086 = build_function_type (builtin_types[(int) RETURN], \
3088 #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \
3089 builtin_types[(int) ENUM] \
3090 = build_function_type (builtin_types[(int) RETURN], \
3091 tree_cons (NULL_TREE, \
3092 builtin_types[(int) ARG1], \
3094 #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \
3095 builtin_types[(int) ENUM] \
3096 = build_function_type \
3097 (builtin_types[(int) RETURN], \
3098 tree_cons (NULL_TREE, \
3099 builtin_types[(int) ARG1], \
3100 tree_cons (NULL_TREE, \
3101 builtin_types[(int) ARG2], \
3103 #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
3104 builtin_types[(int) ENUM] \
3105 = build_function_type \
3106 (builtin_types[(int) RETURN], \
3107 tree_cons (NULL_TREE, \
3108 builtin_types[(int) ARG1], \
3109 tree_cons (NULL_TREE, \
3110 builtin_types[(int) ARG2], \
3111 tree_cons (NULL_TREE, \
3112 builtin_types[(int) ARG3], \
3114 #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \
3115 builtin_types[(int) ENUM] \
3116 = build_function_type \
3117 (builtin_types[(int) RETURN], \
3118 tree_cons (NULL_TREE, \
3119 builtin_types[(int) ARG1], \
3120 tree_cons (NULL_TREE, \
3121 builtin_types[(int) ARG2], \
3124 builtin_types[(int) ARG3], \
3125 tree_cons (NULL_TREE, \
3126 builtin_types[(int) ARG4], \
3127 void_list_node)))));
3128 #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \
3129 builtin_types[(int) ENUM] \
3130 = build_function_type (builtin_types[(int) RETURN], NULL_TREE);
3131 #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \
3132 builtin_types[(int) ENUM] \
3133 = build_function_type (builtin_types[(int) RETURN], \
3134 tree_cons (NULL_TREE, \
3135 builtin_types[(int) ARG1], \
3138 #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \
3139 builtin_types[(int) ENUM] \
3140 = build_function_type \
3141 (builtin_types[(int) RETURN], \
3142 tree_cons (NULL_TREE, \
3143 builtin_types[(int) ARG1], \
3144 tree_cons (NULL_TREE, \
3145 builtin_types[(int) ARG2], \
3148 #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
3149 builtin_types[(int) ENUM] \
3150 = build_function_type \
3151 (builtin_types[(int) RETURN], \
3152 tree_cons (NULL_TREE, \
3153 builtin_types[(int) ARG1], \
3154 tree_cons (NULL_TREE, \
3155 builtin_types[(int) ARG2], \
3156 tree_cons (NULL_TREE, \
3157 builtin_types[(int) ARG3], \
3160 #define DEF_POINTER_TYPE(ENUM, TYPE) \
3161 builtin_types[(int) ENUM] \
3162 = build_pointer_type (builtin_types[(int) TYPE]);
3163 #include "builtin-types.def"
3164 #undef DEF_PRIMITIVE_TYPE
3165 #undef DEF_FUNCTION_TYPE_1
3166 #undef DEF_FUNCTION_TYPE_2
3167 #undef DEF_FUNCTION_TYPE_3
3168 #undef DEF_FUNCTION_TYPE_4
3169 #undef DEF_FUNCTION_TYPE_VAR_0
3170 #undef DEF_FUNCTION_TYPE_VAR_1
3171 #undef DEF_FUNCTION_TYPE_VAR_2
3172 #undef DEF_FUNCTION_TYPE_VAR_3
3173 #undef DEF_POINTER_TYPE
3175 c_init_attributes ();
3177 #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, \
3178 BOTH_P, FALLBACK_P, NONANSI_P, ATTRS, IMPLICIT) \
3183 if (strncmp (NAME, "__builtin_", strlen ("__builtin_")) != 0) \
3187 decl = lang_hooks.builtin_function (NAME, builtin_types[TYPE], \
3191 ? (NAME + strlen ("__builtin_")) \
3193 built_in_attributes[(int) ATTRS]); \
3195 decl = builtin_function_2 (NAME, \
3196 NAME + strlen ("__builtin_"), \
3197 builtin_types[TYPE], \
3198 builtin_types[LIBTYPE], \
3203 built_in_attributes[(int) ATTRS]); \
3205 built_in_decls[(int) ENUM] = decl; \
3207 implicit_built_in_decls[(int) ENUM] = decl; \
3209 #include "builtins.def"
3212 targetm
.init_builtins ();
3216 main_identifier_node
= get_identifier ("main");
3220 build_va_arg (tree expr
, tree type
)
3222 return build1 (VA_ARG_EXPR
, type
, expr
);
3226 /* Linked list of disabled built-in functions. */
3228 typedef struct disabled_builtin
3231 struct disabled_builtin
*next
;
3233 static disabled_builtin
*disabled_builtins
= NULL
;
3235 static bool builtin_function_disabled_p (const char *);
3237 /* Disable a built-in function specified by -fno-builtin-NAME. If NAME
3238 begins with "__builtin_", give an error. */
3241 disable_builtin_function (const char *name
)
3243 if (strncmp (name
, "__builtin_", strlen ("__builtin_")) == 0)
3244 error ("cannot disable built-in function `%s'", name
);
3247 disabled_builtin
*new_disabled_builtin
= XNEW (disabled_builtin
);
3248 new_disabled_builtin
->name
= name
;
3249 new_disabled_builtin
->next
= disabled_builtins
;
3250 disabled_builtins
= new_disabled_builtin
;
3255 /* Return true if the built-in function NAME has been disabled, false
3259 builtin_function_disabled_p (const char *name
)
3261 disabled_builtin
*p
;
3262 for (p
= disabled_builtins
; p
!= NULL
; p
= p
->next
)
3264 if (strcmp (name
, p
->name
) == 0)
3271 /* Possibly define a builtin function with one or two names. BUILTIN_NAME
3272 is an __builtin_-prefixed name; NAME is the ordinary name; one or both
3273 of these may be NULL (though both being NULL is useless).
3274 BUILTIN_TYPE is the type of the __builtin_-prefixed function;
3275 TYPE is the type of the function with the ordinary name. These
3276 may differ if the ordinary name is declared with a looser type to avoid
3277 conflicts with headers. FUNCTION_CODE and CL are as for
3278 builtin_function. If LIBRARY_NAME_P is nonzero, NAME is passed as
3279 the LIBRARY_NAME parameter to builtin_function when declaring BUILTIN_NAME.
3280 If NONANSI_P is true, the name NAME is treated as a non-ANSI name;
3281 ATTRS is the tree list representing the builtin's function attributes.
3282 Returns the declaration of BUILTIN_NAME, if any, otherwise
3283 the declaration of NAME. Does not declare NAME if flag_no_builtin,
3284 or if NONANSI_P and flag_no_nonansi_builtin. */
3287 builtin_function_2 (const char *builtin_name
, const char *name
,
3288 tree builtin_type
, tree type
,
3289 enum built_in_function function_code
,
3290 enum built_in_class cl
, int library_name_p
,
3291 bool nonansi_p
, tree attrs
)
3293 tree bdecl
= NULL_TREE
;
3294 tree decl
= NULL_TREE
;
3296 if (builtin_name
!= 0)
3297 bdecl
= lang_hooks
.builtin_function (builtin_name
, builtin_type
,
3299 library_name_p
? name
: NULL
, attrs
);
3301 if (name
!= 0 && !flag_no_builtin
&& !builtin_function_disabled_p (name
)
3302 && !(nonansi_p
&& flag_no_nonansi_builtin
))
3303 decl
= lang_hooks
.builtin_function (name
, type
, function_code
, cl
,
3306 return (bdecl
!= 0 ? bdecl
: decl
);
3309 /* Nonzero if the type T promotes to int. This is (nearly) the
3310 integral promotions defined in ISO C99 6.3.1.1/2. */
3313 c_promoting_integer_type_p (tree t
)
3315 switch (TREE_CODE (t
))
3318 return (TYPE_MAIN_VARIANT (t
) == char_type_node
3319 || TYPE_MAIN_VARIANT (t
) == signed_char_type_node
3320 || TYPE_MAIN_VARIANT (t
) == unsigned_char_type_node
3321 || TYPE_MAIN_VARIANT (t
) == short_integer_type_node
3322 || TYPE_MAIN_VARIANT (t
) == short_unsigned_type_node
3323 || TYPE_PRECISION (t
) < TYPE_PRECISION (integer_type_node
));
3326 /* ??? Technically all enumerations not larger than an int
3327 promote to an int. But this is used along code paths
3328 that only want to notice a size change. */
3329 return TYPE_PRECISION (t
) < TYPE_PRECISION (integer_type_node
);
3339 /* Return 1 if PARMS specifies a fixed number of parameters
3340 and none of their types is affected by default promotions. */
3343 self_promoting_args_p (tree parms
)
3346 for (t
= parms
; t
; t
= TREE_CHAIN (t
))
3348 tree type
= TREE_VALUE (t
);
3350 if (TREE_CHAIN (t
) == 0 && type
!= void_type_node
)
3356 if (TYPE_MAIN_VARIANT (type
) == float_type_node
)
3359 if (c_promoting_integer_type_p (type
))
3365 /* Recursively examines the array elements of TYPE, until a non-array
3366 element type is found. */
3369 strip_array_types (tree type
)
3371 while (TREE_CODE (type
) == ARRAY_TYPE
)
3372 type
= TREE_TYPE (type
);
3377 /* Recursively remove any '*' or '&' operator from TYPE. */
3379 strip_pointer_operator (tree t
)
3381 while (POINTER_TYPE_P (t
))
3386 /* Walk the statement tree, rooted at *tp. Apply FUNC to all the
3387 sub-trees of *TP in a pre-order traversal. FUNC is called with the
3388 DATA and the address of each sub-tree. If FUNC returns a non-NULL
3389 value, the traversal is aborted, and the value returned by FUNC is
3390 returned. If FUNC sets WALK_SUBTREES to zero, then the subtrees of
3391 the node being visited are not walked.
3393 We don't need a without_duplicates variant of this one because the
3394 statement tree is a tree, not a graph. */
3397 walk_stmt_tree (tree
*tp
, walk_tree_fn func
, void *data
)
3399 enum tree_code code
;
3404 #define WALK_SUBTREE(NODE) \
3407 result = walk_stmt_tree (&(NODE), func, data); \
3413 /* Skip empty subtrees. */
3417 /* Skip subtrees below non-statement nodes. */
3418 if (!STATEMENT_CODE_P (TREE_CODE (*tp
)))
3421 /* Call the function. */
3423 result
= (*func
) (tp
, &walk_subtrees
, data
);
3425 /* If we found something, return it. */
3429 /* FUNC may have modified the tree, recheck that we're looking at a
3431 code
= TREE_CODE (*tp
);
3432 if (!STATEMENT_CODE_P (code
))
3435 /* Visit the subtrees unless FUNC decided that there was nothing
3436 interesting below this point in the tree. */
3439 /* Walk over all the sub-trees of this operand. Statement nodes
3440 never contain RTL, and we needn't worry about TARGET_EXPRs. */
3441 len
= TREE_CODE_LENGTH (code
);
3443 /* Go through the subtrees. We need to do this in forward order so
3444 that the scope of a FOR_EXPR is handled properly. */
3445 for (i
= 0; i
< len
; ++i
)
3446 WALK_SUBTREE (TREE_OPERAND (*tp
, i
));
3449 /* Finally visit the chain. This can be tail-recursion optimized if
3450 we write it this way. */
3451 return walk_stmt_tree (&TREE_CHAIN (*tp
), func
, data
);
3456 /* Used to compare case labels. K1 and K2 are actually tree nodes
3457 representing case labels, or NULL_TREE for a `default' label.
3458 Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after
3459 K2, and 0 if K1 and K2 are equal. */
3462 case_compare (splay_tree_key k1
, splay_tree_key k2
)
3464 /* Consider a NULL key (such as arises with a `default' label) to be
3465 smaller than anything else. */
3471 return tree_int_cst_compare ((tree
) k1
, (tree
) k2
);
3474 /* Process a case label for the range LOW_VALUE ... HIGH_VALUE. If
3475 LOW_VALUE and HIGH_VALUE are both NULL_TREE then this case label is
3476 actually a `default' label. If only HIGH_VALUE is NULL_TREE, then
3477 case label was declared using the usual C/C++ syntax, rather than
3478 the GNU case range extension. CASES is a tree containing all the
3479 case ranges processed so far; COND is the condition for the
3480 switch-statement itself. Returns the CASE_LABEL_EXPR created, or
3481 ERROR_MARK_NODE if no CASE_LABEL_EXPR is created. */
3484 c_add_case_label (splay_tree cases
, tree cond
, tree orig_type
,
3485 tree low_value
, tree high_value
)
3490 splay_tree_node node
;
3492 /* Create the LABEL_DECL itself. */
3493 label
= create_artificial_label ();
3495 /* If there was an error processing the switch condition, bail now
3496 before we get more confused. */
3497 if (!cond
|| cond
== error_mark_node
)
3500 if ((low_value
&& TREE_TYPE (low_value
)
3501 && POINTER_TYPE_P (TREE_TYPE (low_value
)))
3502 || (high_value
&& TREE_TYPE (high_value
)
3503 && POINTER_TYPE_P (TREE_TYPE (high_value
))))
3504 error ("pointers are not permitted as case values");
3506 /* Case ranges are a GNU extension. */
3507 if (high_value
&& pedantic
)
3508 pedwarn ("range expressions in switch statements are non-standard");
3510 type
= TREE_TYPE (cond
);
3513 low_value
= check_case_value (low_value
);
3514 low_value
= convert_and_check (type
, low_value
);
3518 high_value
= check_case_value (high_value
);
3519 high_value
= convert_and_check (type
, high_value
);
3522 /* If an error has occurred, bail out now. */
3523 if (low_value
== error_mark_node
|| high_value
== error_mark_node
)
3526 /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't
3527 really a case range, even though it was written that way. Remove
3528 the HIGH_VALUE to simplify later processing. */
3529 if (tree_int_cst_equal (low_value
, high_value
))
3530 high_value
= NULL_TREE
;
3531 if (low_value
&& high_value
3532 && !tree_int_cst_lt (low_value
, high_value
))
3533 warning ("empty range specified");
3535 /* See if the case is in range of the type of the original testing
3536 expression. If both low_value and high_value are out of range,
3537 don't insert the case label and return NULL_TREE. */
3539 && ! check_case_bounds (type
, orig_type
,
3540 &low_value
, high_value
? &high_value
: NULL
))
3543 /* Look up the LOW_VALUE in the table of case labels we already
3545 node
= splay_tree_lookup (cases
, (splay_tree_key
) low_value
);
3546 /* If there was not an exact match, check for overlapping ranges.
3547 There's no need to do this if there's no LOW_VALUE or HIGH_VALUE;
3548 that's a `default' label and the only overlap is an exact match. */
3549 if (!node
&& (low_value
|| high_value
))
3551 splay_tree_node low_bound
;
3552 splay_tree_node high_bound
;
3554 /* Even though there wasn't an exact match, there might be an
3555 overlap between this case range and another case range.
3556 Since we've (inductively) not allowed any overlapping case
3557 ranges, we simply need to find the greatest low case label
3558 that is smaller that LOW_VALUE, and the smallest low case
3559 label that is greater than LOW_VALUE. If there is an overlap
3560 it will occur in one of these two ranges. */
3561 low_bound
= splay_tree_predecessor (cases
,
3562 (splay_tree_key
) low_value
);
3563 high_bound
= splay_tree_successor (cases
,
3564 (splay_tree_key
) low_value
);
3566 /* Check to see if the LOW_BOUND overlaps. It is smaller than
3567 the LOW_VALUE, so there is no need to check unless the
3568 LOW_BOUND is in fact itself a case range. */
3570 && CASE_HIGH ((tree
) low_bound
->value
)
3571 && tree_int_cst_compare (CASE_HIGH ((tree
) low_bound
->value
),
3574 /* Check to see if the HIGH_BOUND overlaps. The low end of that
3575 range is bigger than the low end of the current range, so we
3576 are only interested if the current range is a real range, and
3577 not an ordinary case label. */
3580 && (tree_int_cst_compare ((tree
) high_bound
->key
,
3585 /* If there was an overlap, issue an error. */
3588 tree duplicate
= CASE_LABEL ((tree
) node
->value
);
3592 error ("duplicate (or overlapping) case value");
3593 error ("%Jthis is the first entry overlapping that value", duplicate
);
3597 error ("duplicate case value") ;
3598 error ("%Jpreviously used here", duplicate
);
3602 error ("multiple default labels in one switch");
3603 error ("%Jthis is the first default label", duplicate
);
3608 /* Add a CASE_LABEL to the statement-tree. */
3609 case_label
= add_stmt (build_case_label (low_value
, high_value
, label
));
3610 /* Register this case label in the splay tree. */
3611 splay_tree_insert (cases
,
3612 (splay_tree_key
) low_value
,
3613 (splay_tree_value
) case_label
);
3618 /* Add a label so that the back-end doesn't think that the beginning of
3619 the switch is unreachable. Note that we do not add a case label, as
3620 that just leads to duplicates and thence to aborts later on. */
3623 tree t
= create_artificial_label ();
3624 add_stmt (build_stmt (LABEL_EXPR
, t
));
3626 return error_mark_node
;
3629 /* Subroutines of c_do_switch_warnings, called via splay_tree_foreach.
3630 Used to verify that case values match up with enumerator values. */
3633 match_case_to_enum_1 (tree key
, tree type
, tree label
)
3635 char buf
[2 + 2*HOST_BITS_PER_WIDE_INT
/4 + 1];
3637 /* ??? Not working too hard to print the double-word value.
3638 Should perhaps be done with %lwd in the diagnostic routines? */
3639 if (TREE_INT_CST_HIGH (key
) == 0)
3640 snprintf (buf
, sizeof (buf
), HOST_WIDE_INT_PRINT_UNSIGNED
,
3641 TREE_INT_CST_LOW (key
));
3642 else if (!TYPE_UNSIGNED (type
)
3643 && TREE_INT_CST_HIGH (key
) == -1
3644 && TREE_INT_CST_LOW (key
) != 0)
3645 snprintf (buf
, sizeof (buf
), "-" HOST_WIDE_INT_PRINT_UNSIGNED
,
3646 -TREE_INT_CST_LOW (key
));
3648 snprintf (buf
, sizeof (buf
), HOST_WIDE_INT_PRINT_DOUBLE_HEX
,
3649 TREE_INT_CST_HIGH (key
), TREE_INT_CST_LOW (key
));
3651 if (TYPE_NAME (type
) == 0)
3652 warning ("%Jcase value `%s' not in enumerated type",
3653 CASE_LABEL (label
), buf
);
3655 warning ("%Jcase value `%s' not in enumerated type `%T'",
3656 CASE_LABEL (label
), buf
, type
);
3660 match_case_to_enum (splay_tree_node node
, void *data
)
3662 tree label
= (tree
) node
->value
;
3663 tree type
= (tree
) data
;
3665 /* Skip default case. */
3666 if (!CASE_LOW (label
))
3669 /* If TREE_ADDRESSABLE is not set, that means CASE_LOW did not appear
3670 when we did our enum->case scan. Reset our scratch bit after. */
3671 if (!TREE_ADDRESSABLE (label
))
3672 match_case_to_enum_1 (CASE_LOW (label
), type
, label
);
3674 TREE_ADDRESSABLE (label
) = 0;
3676 /* If CASE_HIGH is non-null, we have a range. Here we must search.
3677 Note that the old code in stmt.c did not check for the values in
3678 the range either, just the endpoints. */
3679 if (CASE_HIGH (label
))
3681 tree chain
, key
= CASE_HIGH (label
);
3683 for (chain
= TYPE_VALUES (type
);
3684 chain
&& !tree_int_cst_equal (key
, TREE_VALUE (chain
));
3685 chain
= TREE_CHAIN (chain
))
3688 match_case_to_enum_1 (key
, type
, label
);
3694 /* Handle -Wswitch*. Called from the front end after parsing the switch
3696 /* ??? Should probably be somewhere generic, since other languages besides
3697 C and C++ would want this. We'd want to agree on the datastructure,
3698 however, which is a problem. Alternately, we operate on gimplified
3699 switch_exprs, which I don't especially like. At the moment, however,
3700 C/C++ are the only tree-ssa languages that support enumerations at all,
3701 so the point is moot. */
3704 c_do_switch_warnings (splay_tree cases
, tree switch_stmt
)
3706 splay_tree_node default_node
;
3707 location_t switch_location
;
3710 if (!warn_switch
&& !warn_switch_enum
&& !warn_switch_default
)
3713 if (EXPR_HAS_LOCATION (switch_stmt
))
3714 switch_location
= EXPR_LOCATION (switch_stmt
);
3716 switch_location
= input_location
;
3718 type
= SWITCH_TYPE (switch_stmt
);
3720 default_node
= splay_tree_lookup (cases
, (splay_tree_key
) NULL
);
3721 if (warn_switch_default
&& !default_node
)
3722 warning ("%Hswitch missing default case", &switch_location
);
3724 /* If the switch expression was an enumerated type, check that
3725 exactly all enumeration literals are covered by the cases.
3726 The check is made when -Wswitch was specified and there is no
3727 default case, or when -Wswitch-enum was specified. */
3728 if (((warn_switch
&& !default_node
) || warn_switch_enum
)
3729 && type
&& TREE_CODE (type
) == ENUMERAL_TYPE
3730 && TREE_CODE (SWITCH_COND (switch_stmt
)) != INTEGER_CST
)
3734 /* The time complexity here is O(N*lg(N)) worst case, but for the
3735 common case of monotonically increasing enumerators, it is
3736 O(N), since the nature of the splay tree will keep the next
3737 element adjacent to the root at all times. */
3739 for (chain
= TYPE_VALUES (type
); chain
; chain
= TREE_CHAIN (chain
))
3741 splay_tree_node node
3742 = splay_tree_lookup (cases
, (splay_tree_key
) TREE_VALUE (chain
));
3746 /* Mark the CASE_LOW part of the case entry as seen, so
3747 that we save time later. Choose TREE_ADDRESSABLE
3748 randomly as a bit that won't have been set to-date. */
3749 tree label
= (tree
) node
->value
;
3750 TREE_ADDRESSABLE (label
) = 1;
3754 /* Warn if there are enumerators that don't correspond to
3755 case expressions. */
3756 warning ("%Henumeration value `%E' not handled in switch",
3757 &switch_location
, TREE_PURPOSE (chain
));
3761 /* Warn if there are case expressions that don't correspond to
3762 enumerators. This can occur since C and C++ don't enforce
3763 type-checking of assignments to enumeration variables.
3765 The time complexity here is O(N**2) worst case, since we've
3766 not sorted the enumeration values. However, in the absence
3767 of case ranges this is O(N), since all single cases that
3768 corresponded to enumerations have been marked above. */
3770 splay_tree_foreach (cases
, match_case_to_enum
, type
);
3774 /* Finish an expression taking the address of LABEL (an
3775 IDENTIFIER_NODE). Returns an expression for the address. */
3778 finish_label_address_expr (tree label
)
3783 pedwarn ("taking the address of a label is non-standard");
3785 if (label
== error_mark_node
)
3786 return error_mark_node
;
3788 label
= lookup_label (label
);
3789 if (label
== NULL_TREE
)
3790 result
= null_pointer_node
;
3793 TREE_USED (label
) = 1;
3794 result
= build1 (ADDR_EXPR
, ptr_type_node
, label
);
3795 /* The current function in not necessarily uninlinable.
3796 Computed gotos are incompatible with inlining, but the value
3797 here could be used only in a diagnostic, for example. */
3803 /* Hook used by expand_expr to expand language-specific tree codes. */
3804 /* The only things that should go here are bits needed to expand
3805 constant initializers. Everything else should be handled by the
3806 gimplification routines. */
3809 c_expand_expr (tree exp
, rtx target
, enum machine_mode tmode
,
3810 int modifier
/* Actually enum_modifier. */,
3813 switch (TREE_CODE (exp
))
3815 case COMPOUND_LITERAL_EXPR
:
3817 /* Initialize the anonymous variable declared in the compound
3818 literal, then return the variable. */
3819 tree decl
= COMPOUND_LITERAL_EXPR_DECL (exp
);
3820 emit_local_var (decl
);
3821 return expand_expr_real (decl
, target
, tmode
, modifier
, alt_rtl
);
3829 /* Hook used by staticp to handle language-specific tree codes. */
3832 c_staticp (tree exp
)
3834 if (TREE_CODE (exp
) == COMPOUND_LITERAL_EXPR
3835 && TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (exp
)))
3841 /* Given a boolean expression ARG, return a tree representing an increment
3842 or decrement (as indicated by CODE) of ARG. The front end must check for
3843 invalid cases (e.g., decrement in C++). */
3845 boolean_increment (enum tree_code code
, tree arg
)
3848 tree true_res
= boolean_true_node
;
3850 arg
= stabilize_reference (arg
);
3853 case PREINCREMENT_EXPR
:
3854 val
= build (MODIFY_EXPR
, TREE_TYPE (arg
), arg
, true_res
);
3856 case POSTINCREMENT_EXPR
:
3857 val
= build (MODIFY_EXPR
, TREE_TYPE (arg
), arg
, true_res
);
3858 arg
= save_expr (arg
);
3859 val
= build (COMPOUND_EXPR
, TREE_TYPE (arg
), val
, arg
);
3860 val
= build (COMPOUND_EXPR
, TREE_TYPE (arg
), arg
, val
);
3862 case PREDECREMENT_EXPR
:
3863 val
= build (MODIFY_EXPR
, TREE_TYPE (arg
), arg
, invert_truthvalue (arg
));
3865 case POSTDECREMENT_EXPR
:
3866 val
= build (MODIFY_EXPR
, TREE_TYPE (arg
), arg
, invert_truthvalue (arg
));
3867 arg
= save_expr (arg
);
3868 val
= build (COMPOUND_EXPR
, TREE_TYPE (arg
), val
, arg
);
3869 val
= build (COMPOUND_EXPR
, TREE_TYPE (arg
), arg
, val
);
3874 TREE_SIDE_EFFECTS (val
) = 1;
3878 /* Built-in macros for stddef.h, that require macros defined in this
3881 c_stddef_cpp_builtins(void)
3883 builtin_define_with_value ("__SIZE_TYPE__", SIZE_TYPE
, 0);
3884 builtin_define_with_value ("__PTRDIFF_TYPE__", PTRDIFF_TYPE
, 0);
3885 builtin_define_with_value ("__WCHAR_TYPE__", MODIFIED_WCHAR_TYPE
, 0);
3886 builtin_define_with_value ("__WINT_TYPE__", WINT_TYPE
, 0);
3887 builtin_define_with_value ("__INTMAX_TYPE__", INTMAX_TYPE
, 0);
3888 builtin_define_with_value ("__UINTMAX_TYPE__", UINTMAX_TYPE
, 0);
3892 c_init_attributes (void)
3894 /* Fill in the built_in_attributes array. */
3895 #define DEF_ATTR_NULL_TREE(ENUM) \
3896 built_in_attributes[(int) ENUM] = NULL_TREE;
3897 #define DEF_ATTR_INT(ENUM, VALUE) \
3898 built_in_attributes[(int) ENUM] = build_int_2 (VALUE, VALUE < 0 ? -1 : 0);
3899 #define DEF_ATTR_IDENT(ENUM, STRING) \
3900 built_in_attributes[(int) ENUM] = get_identifier (STRING);
3901 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \
3902 built_in_attributes[(int) ENUM] \
3903 = tree_cons (built_in_attributes[(int) PURPOSE], \
3904 built_in_attributes[(int) VALUE], \
3905 built_in_attributes[(int) CHAIN]);
3906 #include "builtin-attrs.def"
3907 #undef DEF_ATTR_NULL_TREE
3909 #undef DEF_ATTR_IDENT
3910 #undef DEF_ATTR_TREE_LIST
3913 /* Attribute handlers common to C front ends. */
3915 /* Handle a "packed" attribute; arguments as in
3916 struct attribute_spec.handler. */
3919 handle_packed_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
3920 int flags
, bool *no_add_attrs
)
3924 if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
3925 *node
= build_type_copy (*node
);
3926 TYPE_PACKED (*node
) = 1;
3927 if (TYPE_MAIN_VARIANT (*node
) == *node
)
3929 /* If it is the main variant, then pack the other variants
3930 too. This happens in,
3933 struct Foo const *ptr; // creates a variant w/o packed flag
3934 } __ attribute__((packed)); // packs it now.
3938 for (probe
= *node
; probe
; probe
= TYPE_NEXT_VARIANT (probe
))
3939 TYPE_PACKED (probe
) = 1;
3943 else if (TREE_CODE (*node
) == FIELD_DECL
)
3944 DECL_PACKED (*node
) = 1;
3945 /* We can't set DECL_PACKED for a VAR_DECL, because the bit is
3946 used for DECL_REGISTER. It wouldn't mean anything anyway.
3947 We can't set DECL_PACKED on the type of a TYPE_DECL, because
3948 that changes what the typedef is typing. */
3951 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
3952 *no_add_attrs
= true;
3958 /* Handle a "nocommon" attribute; arguments as in
3959 struct attribute_spec.handler. */
3962 handle_nocommon_attribute (tree
*node
, tree name
,
3963 tree
ARG_UNUSED (args
),
3964 int ARG_UNUSED (flags
), bool *no_add_attrs
)
3966 if (TREE_CODE (*node
) == VAR_DECL
)
3967 DECL_COMMON (*node
) = 0;
3970 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
3971 *no_add_attrs
= true;
3977 /* Handle a "common" attribute; arguments as in
3978 struct attribute_spec.handler. */
3981 handle_common_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
3982 int ARG_UNUSED (flags
), bool *no_add_attrs
)
3984 if (TREE_CODE (*node
) == VAR_DECL
)
3985 DECL_COMMON (*node
) = 1;
3988 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
3989 *no_add_attrs
= true;
3995 /* Handle a "noreturn" attribute; arguments as in
3996 struct attribute_spec.handler. */
3999 handle_noreturn_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
4000 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4002 tree type
= TREE_TYPE (*node
);
4004 /* See FIXME comment in c_common_attribute_table. */
4005 if (TREE_CODE (*node
) == FUNCTION_DECL
)
4006 TREE_THIS_VOLATILE (*node
) = 1;
4007 else if (TREE_CODE (type
) == POINTER_TYPE
4008 && TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
)
4010 = build_pointer_type
4011 (build_type_variant (TREE_TYPE (type
),
4012 TYPE_READONLY (TREE_TYPE (type
)), 1));
4015 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4016 *no_add_attrs
= true;
4022 /* Handle a "noinline" attribute; arguments as in
4023 struct attribute_spec.handler. */
4026 handle_noinline_attribute (tree
*node
, tree name
,
4027 tree
ARG_UNUSED (args
),
4028 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4030 if (TREE_CODE (*node
) == FUNCTION_DECL
)
4031 DECL_UNINLINABLE (*node
) = 1;
4034 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4035 *no_add_attrs
= true;
4041 /* Handle a "always_inline" attribute; arguments as in
4042 struct attribute_spec.handler. */
4045 handle_always_inline_attribute (tree
*node
, tree name
,
4046 tree
ARG_UNUSED (args
),
4047 int ARG_UNUSED (flags
),
4050 if (TREE_CODE (*node
) == FUNCTION_DECL
)
4052 /* Do nothing else, just set the attribute. We'll get at
4053 it later with lookup_attribute. */
4057 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4058 *no_add_attrs
= true;
4064 /* Handle a "used" attribute; arguments as in
4065 struct attribute_spec.handler. */
4068 handle_used_attribute (tree
*pnode
, tree name
, tree
ARG_UNUSED (args
),
4069 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4073 if (TREE_CODE (node
) == FUNCTION_DECL
4074 || (TREE_CODE (node
) == VAR_DECL
&& TREE_STATIC (node
)))
4076 TREE_USED (node
) = 1;
4080 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4081 *no_add_attrs
= true;
4087 /* Handle a "unused" attribute; arguments as in
4088 struct attribute_spec.handler. */
4091 handle_unused_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
4092 int flags
, bool *no_add_attrs
)
4098 if (TREE_CODE (decl
) == PARM_DECL
4099 || TREE_CODE (decl
) == VAR_DECL
4100 || TREE_CODE (decl
) == FUNCTION_DECL
4101 || TREE_CODE (decl
) == LABEL_DECL
4102 || TREE_CODE (decl
) == TYPE_DECL
)
4103 TREE_USED (decl
) = 1;
4106 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4107 *no_add_attrs
= true;
4112 if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
4113 *node
= build_type_copy (*node
);
4114 TREE_USED (*node
) = 1;
4120 /* Handle a "const" attribute; arguments as in
4121 struct attribute_spec.handler. */
4124 handle_const_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
4125 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4127 tree type
= TREE_TYPE (*node
);
4129 /* See FIXME comment on noreturn in c_common_attribute_table. */
4130 if (TREE_CODE (*node
) == FUNCTION_DECL
)
4131 TREE_READONLY (*node
) = 1;
4132 else if (TREE_CODE (type
) == POINTER_TYPE
4133 && TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
)
4135 = build_pointer_type
4136 (build_type_variant (TREE_TYPE (type
), 1,
4137 TREE_THIS_VOLATILE (TREE_TYPE (type
))));
4140 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4141 *no_add_attrs
= true;
4147 /* Handle a "transparent_union" attribute; arguments as in
4148 struct attribute_spec.handler. */
4151 handle_transparent_union_attribute (tree
*node
, tree name
,
4152 tree
ARG_UNUSED (args
), int flags
,
4155 tree decl
= NULL_TREE
;
4162 type
= &TREE_TYPE (decl
);
4163 is_type
= TREE_CODE (*node
) == TYPE_DECL
;
4165 else if (TYPE_P (*node
))
4166 type
= node
, is_type
= 1;
4169 && TREE_CODE (*type
) == UNION_TYPE
4171 || (TYPE_FIELDS (*type
) != 0
4172 && TYPE_MODE (*type
) == DECL_MODE (TYPE_FIELDS (*type
)))))
4174 if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
4175 *type
= build_type_copy (*type
);
4176 TYPE_TRANSPARENT_UNION (*type
) = 1;
4178 else if (decl
!= 0 && TREE_CODE (decl
) == PARM_DECL
4179 && TREE_CODE (*type
) == UNION_TYPE
4180 && TYPE_MODE (*type
) == DECL_MODE (TYPE_FIELDS (*type
)))
4181 DECL_TRANSPARENT_UNION (decl
) = 1;
4184 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4185 *no_add_attrs
= true;
4191 /* Handle a "constructor" attribute; arguments as in
4192 struct attribute_spec.handler. */
4195 handle_constructor_attribute (tree
*node
, tree name
,
4196 tree
ARG_UNUSED (args
),
4197 int ARG_UNUSED (flags
),
4201 tree type
= TREE_TYPE (decl
);
4203 if (TREE_CODE (decl
) == FUNCTION_DECL
4204 && TREE_CODE (type
) == FUNCTION_TYPE
4205 && decl_function_context (decl
) == 0)
4207 DECL_STATIC_CONSTRUCTOR (decl
) = 1;
4208 TREE_USED (decl
) = 1;
4212 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4213 *no_add_attrs
= true;
4219 /* Handle a "destructor" attribute; arguments as in
4220 struct attribute_spec.handler. */
4223 handle_destructor_attribute (tree
*node
, tree name
,
4224 tree
ARG_UNUSED (args
),
4225 int ARG_UNUSED (flags
),
4229 tree type
= TREE_TYPE (decl
);
4231 if (TREE_CODE (decl
) == FUNCTION_DECL
4232 && TREE_CODE (type
) == FUNCTION_TYPE
4233 && decl_function_context (decl
) == 0)
4235 DECL_STATIC_DESTRUCTOR (decl
) = 1;
4236 TREE_USED (decl
) = 1;
4240 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4241 *no_add_attrs
= true;
4247 /* Handle a "mode" attribute; arguments as in
4248 struct attribute_spec.handler. */
4251 handle_mode_attribute (tree
*node
, tree name
, tree args
,
4252 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4256 *no_add_attrs
= true;
4258 if (TREE_CODE (TREE_VALUE (args
)) != IDENTIFIER_NODE
)
4259 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4263 const char *p
= IDENTIFIER_POINTER (TREE_VALUE (args
));
4264 int len
= strlen (p
);
4265 enum machine_mode mode
= VOIDmode
;
4269 if (len
> 4 && p
[0] == '_' && p
[1] == '_'
4270 && p
[len
- 1] == '_' && p
[len
- 2] == '_')
4272 char *newp
= (char *) alloca (len
- 1);
4274 strcpy (newp
, &p
[2]);
4275 newp
[len
- 4] = '\0';
4279 /* Change this type to have a type with the specified mode.
4280 First check for the special modes. */
4281 if (! strcmp (p
, "byte"))
4283 else if (!strcmp (p
, "word"))
4285 else if (! strcmp (p
, "pointer"))
4288 for (j
= 0; j
< NUM_MACHINE_MODES
; j
++)
4289 if (!strcmp (p
, GET_MODE_NAME (j
)))
4290 mode
= (enum machine_mode
) j
;
4292 if (mode
== VOIDmode
)
4294 error ("unknown machine mode `%s'", p
);
4298 if (VECTOR_MODE_P (mode
))
4300 warning ("specifying vector types with __attribute__ ((mode)) "
4302 warning ("use __attribute__ ((vector_size)) instead");
4305 typefm
= lang_hooks
.types
.type_for_mode (mode
, TYPE_UNSIGNED (type
));
4306 if (typefm
== NULL_TREE
)
4307 error ("no data type for mode `%s'", p
);
4309 else if ((TREE_CODE (type
) == POINTER_TYPE
4310 || TREE_CODE (type
) == REFERENCE_TYPE
)
4311 && !targetm
.valid_pointer_mode (mode
))
4312 error ("invalid pointer mode `%s'", p
);
4315 /* If this is a vector, make sure we either have hardware
4316 support, or we can emulate it. */
4317 if (VECTOR_MODE_P (mode
) && !vector_mode_valid_p (mode
))
4319 error ("unable to emulate '%s'", GET_MODE_NAME (mode
));
4323 if (TREE_CODE (type
) == POINTER_TYPE
)
4325 ptr_type
= build_pointer_type_for_mode (TREE_TYPE (type
),
4329 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
4331 ptr_type
= build_reference_type_for_mode (TREE_TYPE (type
),
4337 /* No need to layout the type here. The caller should do this. */
4344 /* Handle a "section" attribute; arguments as in
4345 struct attribute_spec.handler. */
4348 handle_section_attribute (tree
*node
, tree
ARG_UNUSED (name
), tree args
,
4349 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4353 if (targetm
.have_named_sections
)
4355 if ((TREE_CODE (decl
) == FUNCTION_DECL
4356 || TREE_CODE (decl
) == VAR_DECL
)
4357 && TREE_CODE (TREE_VALUE (args
)) == STRING_CST
)
4359 if (TREE_CODE (decl
) == VAR_DECL
4360 && current_function_decl
!= NULL_TREE
4361 && ! TREE_STATIC (decl
))
4363 error ("%Jsection attribute cannot be specified for "
4364 "local variables", decl
);
4365 *no_add_attrs
= true;
4368 /* The decl may have already been given a section attribute
4369 from a previous declaration. Ensure they match. */
4370 else if (DECL_SECTION_NAME (decl
) != NULL_TREE
4371 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl
)),
4372 TREE_STRING_POINTER (TREE_VALUE (args
))) != 0)
4374 error ("%Jsection of '%D' conflicts with previous declaration",
4376 *no_add_attrs
= true;
4379 DECL_SECTION_NAME (decl
) = TREE_VALUE (args
);
4383 error ("%Jsection attribute not allowed for '%D'", *node
, *node
);
4384 *no_add_attrs
= true;
4389 error ("%Jsection attributes are not supported for this target", *node
);
4390 *no_add_attrs
= true;
4396 /* Handle a "aligned" attribute; arguments as in
4397 struct attribute_spec.handler. */
4400 handle_aligned_attribute (tree
*node
, tree
ARG_UNUSED (name
), tree args
,
4401 int flags
, bool *no_add_attrs
)
4403 tree decl
= NULL_TREE
;
4406 tree align_expr
= (args
? TREE_VALUE (args
)
4407 : size_int (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
4413 type
= &TREE_TYPE (decl
);
4414 is_type
= TREE_CODE (*node
) == TYPE_DECL
;
4416 else if (TYPE_P (*node
))
4417 type
= node
, is_type
= 1;
4419 /* Strip any NOPs of any kind. */
4420 while (TREE_CODE (align_expr
) == NOP_EXPR
4421 || TREE_CODE (align_expr
) == CONVERT_EXPR
4422 || TREE_CODE (align_expr
) == NON_LVALUE_EXPR
)
4423 align_expr
= TREE_OPERAND (align_expr
, 0);
4425 if (TREE_CODE (align_expr
) != INTEGER_CST
)
4427 error ("requested alignment is not a constant");
4428 *no_add_attrs
= true;
4430 else if ((i
= tree_log2 (align_expr
)) == -1)
4432 error ("requested alignment is not a power of 2");
4433 *no_add_attrs
= true;
4435 else if (i
> HOST_BITS_PER_INT
- 2)
4437 error ("requested alignment is too large");
4438 *no_add_attrs
= true;
4442 /* If we have a TYPE_DECL, then copy the type, so that we
4443 don't accidentally modify a builtin type. See pushdecl. */
4444 if (decl
&& TREE_TYPE (decl
) != error_mark_node
4445 && DECL_ORIGINAL_TYPE (decl
) == NULL_TREE
)
4447 tree tt
= TREE_TYPE (decl
);
4448 *type
= build_type_copy (*type
);
4449 DECL_ORIGINAL_TYPE (decl
) = tt
;
4450 TYPE_NAME (*type
) = decl
;
4451 TREE_USED (*type
) = TREE_USED (decl
);
4452 TREE_TYPE (decl
) = *type
;
4454 else if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
4455 *type
= build_type_copy (*type
);
4457 TYPE_ALIGN (*type
) = (1 << i
) * BITS_PER_UNIT
;
4458 TYPE_USER_ALIGN (*type
) = 1;
4460 else if (TREE_CODE (decl
) != VAR_DECL
4461 && TREE_CODE (decl
) != FIELD_DECL
)
4463 error ("%Jalignment may not be specified for '%D'", decl
, decl
);
4464 *no_add_attrs
= true;
4468 DECL_ALIGN (decl
) = (1 << i
) * BITS_PER_UNIT
;
4469 DECL_USER_ALIGN (decl
) = 1;
4475 /* Handle a "weak" attribute; arguments as in
4476 struct attribute_spec.handler. */
4479 handle_weak_attribute (tree
*node
, tree
ARG_UNUSED (name
),
4480 tree
ARG_UNUSED (args
),
4481 int ARG_UNUSED (flags
),
4482 bool * ARG_UNUSED (no_add_attrs
))
4484 declare_weak (*node
);
4489 /* Handle an "alias" attribute; arguments as in
4490 struct attribute_spec.handler. */
4493 handle_alias_attribute (tree
*node
, tree name
, tree args
,
4494 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4498 if ((TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_INITIAL (decl
))
4499 || (TREE_CODE (decl
) != FUNCTION_DECL
&& ! DECL_EXTERNAL (decl
)))
4501 error ("%J'%D' defined both normally and as an alias", decl
, decl
);
4502 *no_add_attrs
= true;
4505 /* Note that the very first time we process a nested declaration,
4506 decl_function_context will not be set. Indeed, *would* never
4507 be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that
4508 we do below. After such frobbery, pushdecl would set the context.
4509 In any case, this is never what we want. */
4510 else if (decl_function_context (decl
) == 0 && current_function_decl
== NULL
)
4514 id
= TREE_VALUE (args
);
4515 if (TREE_CODE (id
) != STRING_CST
)
4517 error ("alias arg not a string");
4518 *no_add_attrs
= true;
4521 id
= get_identifier (TREE_STRING_POINTER (id
));
4522 /* This counts as a use of the object pointed to. */
4525 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4526 DECL_INITIAL (decl
) = error_mark_node
;
4529 DECL_EXTERNAL (decl
) = 0;
4530 TREE_STATIC (decl
) = 1;
4535 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4536 *no_add_attrs
= true;
4542 /* Handle an "visibility" attribute; arguments as in
4543 struct attribute_spec.handler. */
4546 handle_visibility_attribute (tree
*node
, tree name
, tree args
,
4547 int ARG_UNUSED (flags
),
4551 tree id
= TREE_VALUE (args
);
4553 *no_add_attrs
= true;
4557 if (TREE_CODE (*node
) != RECORD_TYPE
&& TREE_CODE (*node
) != UNION_TYPE
)
4559 warning ("`%s' attribute ignored on non-class types",
4560 IDENTIFIER_POINTER (name
));
4564 else if (decl_function_context (decl
) != 0 || ! TREE_PUBLIC (decl
))
4566 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4570 if (TREE_CODE (id
) != STRING_CST
)
4572 error ("visibility arg not a string");
4576 /* If this is a type, set the visibility on the type decl. */
4579 decl
= TYPE_NAME (decl
);
4584 if (strcmp (TREE_STRING_POINTER (id
), "default") == 0)
4585 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4586 else if (strcmp (TREE_STRING_POINTER (id
), "internal") == 0)
4587 DECL_VISIBILITY (decl
) = VISIBILITY_INTERNAL
;
4588 else if (strcmp (TREE_STRING_POINTER (id
), "hidden") == 0)
4589 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
4590 else if (strcmp (TREE_STRING_POINTER (id
), "protected") == 0)
4591 DECL_VISIBILITY (decl
) = VISIBILITY_PROTECTED
;
4593 error ("visibility arg must be one of \"default\", \"hidden\", \"protected\" or \"internal\"");
4594 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4596 /* For decls only, go ahead and attach the attribute to the node as well.
4597 This is needed so we can determine whether we have VISIBILITY_DEFAULT
4598 because the visibility was not specified, or because it was explicitly
4599 overridden from the class visibility. */
4601 *no_add_attrs
= false;
4606 /* Determine the ELF symbol visibility for DECL, which is either a
4607 variable or a function. It is an error to use this function if a
4608 definition of DECL is not available in this translation unit.
4609 Returns true if the final visibility has been determined by this
4610 function; false if the caller is free to make additional
4614 c_determine_visibility (tree decl
)
4616 my_friendly_assert (TREE_CODE (decl
) == VAR_DECL
4617 || TREE_CODE (decl
) == FUNCTION_DECL
,
4620 /* If the user explicitly specified the visibility with an
4621 attribute, honor that. DECL_VISIBILITY will have been set during
4622 the processing of the attribute. We check for an explicit
4623 attribute, rather than just checking DECL_VISIBILITY_SPECIFIED,
4624 to distinguish the use of an attribute from the use of a "#pragma
4625 GCC visibility push(...)"; in the latter case we still want other
4626 considerations to be able to overrule the #pragma. */
4627 if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl
)))
4630 /* Anything that is exported must have default visibility. */
4631 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
4632 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl
)))
4634 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
4635 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
4642 /* Handle an "tls_model" attribute; arguments as in
4643 struct attribute_spec.handler. */
4646 handle_tls_model_attribute (tree
*node
, tree name
, tree args
,
4647 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4651 if (! DECL_THREAD_LOCAL (decl
))
4653 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4654 *no_add_attrs
= true;
4660 id
= TREE_VALUE (args
);
4661 if (TREE_CODE (id
) != STRING_CST
)
4663 error ("tls_model arg not a string");
4664 *no_add_attrs
= true;
4667 if (strcmp (TREE_STRING_POINTER (id
), "local-exec")
4668 && strcmp (TREE_STRING_POINTER (id
), "initial-exec")
4669 && strcmp (TREE_STRING_POINTER (id
), "local-dynamic")
4670 && strcmp (TREE_STRING_POINTER (id
), "global-dynamic"))
4672 error ("tls_model arg must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\"");
4673 *no_add_attrs
= true;
4681 /* Handle a "no_instrument_function" attribute; arguments as in
4682 struct attribute_spec.handler. */
4685 handle_no_instrument_function_attribute (tree
*node
, tree name
,
4686 tree
ARG_UNUSED (args
),
4687 int ARG_UNUSED (flags
),
4692 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4694 error ("%J'%E' attribute applies only to functions", decl
, name
);
4695 *no_add_attrs
= true;
4697 else if (DECL_INITIAL (decl
))
4699 error ("%Jcan't set '%E' attribute after definition", decl
, name
);
4700 *no_add_attrs
= true;
4703 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl
) = 1;
4708 /* Handle a "malloc" attribute; arguments as in
4709 struct attribute_spec.handler. */
4712 handle_malloc_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
4713 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4715 if (TREE_CODE (*node
) == FUNCTION_DECL
)
4716 DECL_IS_MALLOC (*node
) = 1;
4717 /* ??? TODO: Support types. */
4720 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4721 *no_add_attrs
= true;
4727 /* Handle a "no_limit_stack" attribute; arguments as in
4728 struct attribute_spec.handler. */
4731 handle_no_limit_stack_attribute (tree
*node
, tree name
,
4732 tree
ARG_UNUSED (args
),
4733 int ARG_UNUSED (flags
),
4738 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4740 error ("%J'%E' attribute applies only to functions", decl
, name
);
4741 *no_add_attrs
= true;
4743 else if (DECL_INITIAL (decl
))
4745 error ("%Jcan't set '%E' attribute after definition", decl
, name
);
4746 *no_add_attrs
= true;
4749 DECL_NO_LIMIT_STACK (decl
) = 1;
4754 /* Handle a "pure" attribute; arguments as in
4755 struct attribute_spec.handler. */
4758 handle_pure_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
4759 int ARG_UNUSED (flags
), bool *no_add_attrs
)
4761 if (TREE_CODE (*node
) == FUNCTION_DECL
)
4762 DECL_IS_PURE (*node
) = 1;
4763 /* ??? TODO: Support types. */
4766 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4767 *no_add_attrs
= true;
4773 /* Handle a "deprecated" attribute; arguments as in
4774 struct attribute_spec.handler. */
4777 handle_deprecated_attribute (tree
*node
, tree name
,
4778 tree
ARG_UNUSED (args
), int flags
,
4781 tree type
= NULL_TREE
;
4783 const char *what
= NULL
;
4788 type
= TREE_TYPE (decl
);
4790 if (TREE_CODE (decl
) == TYPE_DECL
4791 || TREE_CODE (decl
) == PARM_DECL
4792 || TREE_CODE (decl
) == VAR_DECL
4793 || TREE_CODE (decl
) == FUNCTION_DECL
4794 || TREE_CODE (decl
) == FIELD_DECL
)
4795 TREE_DEPRECATED (decl
) = 1;
4799 else if (TYPE_P (*node
))
4801 if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
4802 *node
= build_type_copy (*node
);
4803 TREE_DEPRECATED (*node
) = 1;
4811 *no_add_attrs
= true;
4812 if (type
&& TYPE_NAME (type
))
4814 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
4815 what
= IDENTIFIER_POINTER (TYPE_NAME (*node
));
4816 else if (TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
4817 && DECL_NAME (TYPE_NAME (type
)))
4818 what
= IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type
)));
4821 warning ("`%s' attribute ignored for `%s'",
4822 IDENTIFIER_POINTER (name
), what
);
4824 warning ("`%s' attribute ignored",
4825 IDENTIFIER_POINTER (name
));
4831 /* Handle a "vector_size" attribute; arguments as in
4832 struct attribute_spec.handler. */
4835 handle_vector_size_attribute (tree
*node
, tree name
, tree args
,
4836 int ARG_UNUSED (flags
),
4839 unsigned HOST_WIDE_INT vecsize
, nunits
;
4840 enum machine_mode orig_mode
;
4841 tree type
= *node
, new_type
, size
;
4843 *no_add_attrs
= true;
4845 /* Stripping NON_LVALUE_EXPR allows declarations such as
4846 typedef short v4si __attribute__((vector_size (4 * sizeof(short)))). */
4847 size
= TREE_VALUE (args
);
4848 if (TREE_CODE (size
) == NON_LVALUE_EXPR
)
4849 size
= TREE_OPERAND (size
, 0);
4851 if (! host_integerp (size
, 1))
4853 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
4857 /* Get the vector size (in bytes). */
4858 vecsize
= tree_low_cst (size
, 1);
4860 /* We need to provide for vector pointers, vector arrays, and
4861 functions returning vectors. For example:
4863 __attribute__((vector_size(16))) short *foo;
4865 In this case, the mode is SI, but the type being modified is
4866 HI, so we need to look further. */
4868 while (POINTER_TYPE_P (type
)
4869 || TREE_CODE (type
) == FUNCTION_TYPE
4870 || TREE_CODE (type
) == METHOD_TYPE
4871 || TREE_CODE (type
) == ARRAY_TYPE
)
4872 type
= TREE_TYPE (type
);
4874 /* Get the mode of the type being modified. */
4875 orig_mode
= TYPE_MODE (type
);
4877 if (TREE_CODE (type
) == RECORD_TYPE
4878 || (GET_MODE_CLASS (orig_mode
) != MODE_FLOAT
4879 && GET_MODE_CLASS (orig_mode
) != MODE_INT
)
4880 || ! host_integerp (TYPE_SIZE_UNIT (type
), 1))
4882 error ("invalid vector type for attribute `%s'",
4883 IDENTIFIER_POINTER (name
));
4887 /* Calculate how many units fit in the vector. */
4888 nunits
= vecsize
/ tree_low_cst (TYPE_SIZE_UNIT (type
), 1);
4889 if (nunits
& (nunits
- 1))
4891 error ("number of components of the vector not a power of two");
4895 new_type
= build_vector_type (type
, nunits
);
4897 /* Build back pointers if needed. */
4898 *node
= reconstruct_complex_type (*node
, new_type
);
4903 /* Handle the "nonnull" attribute. */
4905 handle_nonnull_attribute (tree
*node
, tree
ARG_UNUSED (name
),
4906 tree args
, int ARG_UNUSED (flags
),
4910 unsigned HOST_WIDE_INT attr_arg_num
;
4912 /* If no arguments are specified, all pointer arguments should be
4913 non-null. Verify a full prototype is given so that the arguments
4914 will have the correct types when we actually check them later. */
4917 if (! TYPE_ARG_TYPES (type
))
4919 error ("nonnull attribute without arguments on a non-prototype");
4920 *no_add_attrs
= true;
4925 /* Argument list specified. Verify that each argument number references
4926 a pointer argument. */
4927 for (attr_arg_num
= 1; args
; args
= TREE_CHAIN (args
))
4930 unsigned HOST_WIDE_INT arg_num
= 0, ck_num
;
4932 if (! get_nonnull_operand (TREE_VALUE (args
), &arg_num
))
4934 error ("nonnull argument has invalid operand number (arg %lu)",
4935 (unsigned long) attr_arg_num
);
4936 *no_add_attrs
= true;
4940 argument
= TYPE_ARG_TYPES (type
);
4943 for (ck_num
= 1; ; ck_num
++)
4945 if (! argument
|| ck_num
== arg_num
)
4947 argument
= TREE_CHAIN (argument
);
4951 || TREE_CODE (TREE_VALUE (argument
)) == VOID_TYPE
)
4953 error ("nonnull argument with out-of-range operand number (arg %lu, operand %lu)",
4954 (unsigned long) attr_arg_num
, (unsigned long) arg_num
);
4955 *no_add_attrs
= true;
4959 if (TREE_CODE (TREE_VALUE (argument
)) != POINTER_TYPE
)
4961 error ("nonnull argument references non-pointer operand (arg %lu, operand %lu)",
4962 (unsigned long) attr_arg_num
, (unsigned long) arg_num
);
4963 *no_add_attrs
= true;
4972 /* Check the argument list of a function call for null in argument slots
4973 that are marked as requiring a non-null pointer argument. */
4976 check_function_nonnull (tree attrs
, tree params
)
4978 tree a
, args
, param
;
4981 for (a
= attrs
; a
; a
= TREE_CHAIN (a
))
4983 if (is_attribute_p ("nonnull", TREE_PURPOSE (a
)))
4985 args
= TREE_VALUE (a
);
4987 /* Walk the argument list. If we encounter an argument number we
4988 should check for non-null, do it. If the attribute has no args,
4989 then every pointer argument is checked (in which case the check
4990 for pointer type is done in check_nonnull_arg). */
4991 for (param
= params
, param_num
= 1; ;
4992 param_num
++, param
= TREE_CHAIN (param
))
4996 if (! args
|| nonnull_check_p (args
, param_num
))
4997 check_function_arguments_recurse (check_nonnull_arg
, NULL
,
5005 /* Helper for check_function_nonnull; given a list of operands which
5006 must be non-null in ARGS, determine if operand PARAM_NUM should be
5010 nonnull_check_p (tree args
, unsigned HOST_WIDE_INT param_num
)
5012 unsigned HOST_WIDE_INT arg_num
= 0;
5014 for (; args
; args
= TREE_CHAIN (args
))
5016 if (! get_nonnull_operand (TREE_VALUE (args
), &arg_num
))
5019 if (arg_num
== param_num
)
5025 /* Check that the function argument PARAM (which is operand number
5026 PARAM_NUM) is non-null. This is called by check_function_nonnull
5027 via check_function_arguments_recurse. */
5030 check_nonnull_arg (void * ARG_UNUSED (ctx
), tree param
,
5031 unsigned HOST_WIDE_INT param_num
)
5033 /* Just skip checking the argument if it's not a pointer. This can
5034 happen if the "nonnull" attribute was given without an operand
5035 list (which means to check every pointer argument). */
5037 if (TREE_CODE (TREE_TYPE (param
)) != POINTER_TYPE
)
5040 if (integer_zerop (param
))
5041 warning ("null argument where non-null required (arg %lu)",
5042 (unsigned long) param_num
);
5045 /* Helper for nonnull attribute handling; fetch the operand number
5046 from the attribute argument list. */
5049 get_nonnull_operand (tree arg_num_expr
, unsigned HOST_WIDE_INT
*valp
)
5051 /* Strip any conversions from the arg number and verify they
5053 while (TREE_CODE (arg_num_expr
) == NOP_EXPR
5054 || TREE_CODE (arg_num_expr
) == CONVERT_EXPR
5055 || TREE_CODE (arg_num_expr
) == NON_LVALUE_EXPR
)
5056 arg_num_expr
= TREE_OPERAND (arg_num_expr
, 0);
5058 if (TREE_CODE (arg_num_expr
) != INTEGER_CST
5059 || TREE_INT_CST_HIGH (arg_num_expr
) != 0)
5062 *valp
= TREE_INT_CST_LOW (arg_num_expr
);
5066 /* Handle a "nothrow" attribute; arguments as in
5067 struct attribute_spec.handler. */
5070 handle_nothrow_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
5071 int ARG_UNUSED (flags
), bool *no_add_attrs
)
5073 if (TREE_CODE (*node
) == FUNCTION_DECL
)
5074 TREE_NOTHROW (*node
) = 1;
5075 /* ??? TODO: Support types. */
5078 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
5079 *no_add_attrs
= true;
5085 /* Handle a "cleanup" attribute; arguments as in
5086 struct attribute_spec.handler. */
5089 handle_cleanup_attribute (tree
*node
, tree name
, tree args
,
5090 int ARG_UNUSED (flags
), bool *no_add_attrs
)
5093 tree cleanup_id
, cleanup_decl
;
5095 /* ??? Could perhaps support cleanups on TREE_STATIC, much like we do
5096 for global destructors in C++. This requires infrastructure that
5097 we don't have generically at the moment. It's also not a feature
5098 we'd be missing too much, since we do have attribute constructor. */
5099 if (TREE_CODE (decl
) != VAR_DECL
|| TREE_STATIC (decl
))
5101 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
5102 *no_add_attrs
= true;
5106 /* Verify that the argument is a function in scope. */
5107 /* ??? We could support pointers to functions here as well, if
5108 that was considered desirable. */
5109 cleanup_id
= TREE_VALUE (args
);
5110 if (TREE_CODE (cleanup_id
) != IDENTIFIER_NODE
)
5112 error ("cleanup arg not an identifier");
5113 *no_add_attrs
= true;
5116 cleanup_decl
= lookup_name (cleanup_id
);
5117 if (!cleanup_decl
|| TREE_CODE (cleanup_decl
) != FUNCTION_DECL
)
5119 error ("cleanup arg not a function");
5120 *no_add_attrs
= true;
5124 /* That the function has proper type is checked with the
5125 eventual call to build_function_call. */
5130 /* Handle a "warn_unused_result" attribute. No special handling. */
5133 handle_warn_unused_result_attribute (tree
*node
, tree name
,
5134 tree
ARG_UNUSED (args
),
5135 int ARG_UNUSED (flags
), bool *no_add_attrs
)
5137 /* Ignore the attribute for functions not returning any value. */
5138 if (VOID_TYPE_P (TREE_TYPE (*node
)))
5140 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
5141 *no_add_attrs
= true;
5147 /* Check for valid arguments being passed to a function. */
5149 check_function_arguments (tree attrs
, tree params
)
5151 /* Check for null being passed in a pointer argument that must be
5152 non-null. We also need to do this if format checking is enabled. */
5155 check_function_nonnull (attrs
, params
);
5157 /* Check for errors in format strings. */
5160 check_function_format (attrs
, params
);
5163 /* Generic argument checking recursion routine. PARAM is the argument to
5164 be checked. PARAM_NUM is the number of the argument. CALLBACK is invoked
5165 once the argument is resolved. CTX is context for the callback. */
5167 check_function_arguments_recurse (void (*callback
)
5168 (void *, tree
, unsigned HOST_WIDE_INT
),
5169 void *ctx
, tree param
,
5170 unsigned HOST_WIDE_INT param_num
)
5172 if (TREE_CODE (param
) == NOP_EXPR
)
5174 /* Strip coercion. */
5175 check_function_arguments_recurse (callback
, ctx
,
5176 TREE_OPERAND (param
, 0), param_num
);
5180 if (TREE_CODE (param
) == CALL_EXPR
)
5182 tree type
= TREE_TYPE (TREE_TYPE (TREE_OPERAND (param
, 0)));
5184 bool found_format_arg
= false;
5186 /* See if this is a call to a known internationalization function
5187 that modifies a format arg. Such a function may have multiple
5188 format_arg attributes (for example, ngettext). */
5190 for (attrs
= TYPE_ATTRIBUTES (type
);
5192 attrs
= TREE_CHAIN (attrs
))
5193 if (is_attribute_p ("format_arg", TREE_PURPOSE (attrs
)))
5196 tree format_num_expr
;
5200 /* Extract the argument number, which was previously checked
5202 format_num_expr
= TREE_VALUE (TREE_VALUE (attrs
));
5203 while (TREE_CODE (format_num_expr
) == NOP_EXPR
5204 || TREE_CODE (format_num_expr
) == CONVERT_EXPR
5205 || TREE_CODE (format_num_expr
) == NON_LVALUE_EXPR
)
5206 format_num_expr
= TREE_OPERAND (format_num_expr
, 0);
5208 if (TREE_CODE (format_num_expr
) != INTEGER_CST
5209 || TREE_INT_CST_HIGH (format_num_expr
) != 0)
5212 format_num
= TREE_INT_CST_LOW (format_num_expr
);
5214 for (inner_args
= TREE_OPERAND (param
, 1), i
= 1;
5216 inner_args
= TREE_CHAIN (inner_args
), i
++)
5217 if (i
== format_num
)
5219 check_function_arguments_recurse (callback
, ctx
,
5220 TREE_VALUE (inner_args
),
5222 found_format_arg
= true;
5227 /* If we found a format_arg attribute and did a recursive check,
5228 we are done with checking this argument. Otherwise, we continue
5229 and this will be considered a non-literal. */
5230 if (found_format_arg
)
5234 if (TREE_CODE (param
) == COND_EXPR
)
5236 /* Check both halves of the conditional expression. */
5237 check_function_arguments_recurse (callback
, ctx
,
5238 TREE_OPERAND (param
, 1), param_num
);
5239 check_function_arguments_recurse (callback
, ctx
,
5240 TREE_OPERAND (param
, 2), param_num
);
5244 (*callback
) (ctx
, param
, param_num
);
5247 /* Function to help qsort sort FIELD_DECLs by name order. */
5250 field_decl_cmp (const void *x_p
, const void *y_p
)
5252 const tree
*const x
= (const tree
*const) x_p
;
5253 const tree
*const y
= (const tree
*const) y_p
;
5255 if (DECL_NAME (*x
) == DECL_NAME (*y
))
5256 /* A nontype is "greater" than a type. */
5257 return (TREE_CODE (*y
) == TYPE_DECL
) - (TREE_CODE (*x
) == TYPE_DECL
);
5258 if (DECL_NAME (*x
) == NULL_TREE
)
5260 if (DECL_NAME (*y
) == NULL_TREE
)
5262 if (DECL_NAME (*x
) < DECL_NAME (*y
))
5268 gt_pointer_operator new_value
;
5272 /* This routine compares two fields like field_decl_cmp but using the
5273 pointer operator in resort_data. */
5276 resort_field_decl_cmp (const void *x_p
, const void *y_p
)
5278 const tree
*const x
= (const tree
*const) x_p
;
5279 const tree
*const y
= (const tree
*const) y_p
;
5281 if (DECL_NAME (*x
) == DECL_NAME (*y
))
5282 /* A nontype is "greater" than a type. */
5283 return (TREE_CODE (*y
) == TYPE_DECL
) - (TREE_CODE (*x
) == TYPE_DECL
);
5284 if (DECL_NAME (*x
) == NULL_TREE
)
5286 if (DECL_NAME (*y
) == NULL_TREE
)
5289 tree d1
= DECL_NAME (*x
);
5290 tree d2
= DECL_NAME (*y
);
5291 resort_data
.new_value (&d1
, resort_data
.cookie
);
5292 resort_data
.new_value (&d2
, resort_data
.cookie
);
5299 /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */
5302 resort_sorted_fields (void *obj
,
5303 void * ARG_UNUSED (orig_obj
),
5304 gt_pointer_operator new_value
,
5307 struct sorted_fields_type
*sf
= (struct sorted_fields_type
*) obj
;
5308 resort_data
.new_value
= new_value
;
5309 resort_data
.cookie
= cookie
;
5310 qsort (&sf
->elts
[0], sf
->len
, sizeof (tree
),
5311 resort_field_decl_cmp
);
5314 /* Issue the error given by MSGID, indicating that it occurred before
5315 TOKEN, which had the associated VALUE. */
5318 c_parse_error (const char *msgid
, enum cpp_ttype token
, tree value
)
5320 const char *string
= _(msgid
);
5322 if (token
== CPP_EOF
)
5323 error ("%s at end of input", string
);
5324 else if (token
== CPP_CHAR
|| token
== CPP_WCHAR
)
5326 unsigned int val
= TREE_INT_CST_LOW (value
);
5327 const char *const ell
= (token
== CPP_CHAR
) ? "" : "L";
5328 if (val
<= UCHAR_MAX
&& ISGRAPH (val
))
5329 error ("%s before %s'%c'", string
, ell
, val
);
5331 error ("%s before %s'\\x%x'", string
, ell
, val
);
5333 else if (token
== CPP_STRING
5334 || token
== CPP_WSTRING
)
5335 error ("%s before string constant", string
);
5336 else if (token
== CPP_NUMBER
)
5337 error ("%s before numeric constant", string
);
5338 else if (token
== CPP_NAME
)
5339 error ("%s before \"%s\"", string
, IDENTIFIER_POINTER (value
));
5340 else if (token
< N_TTYPES
)
5341 error ("%s before '%s' token", string
, cpp_type2name (token
));
5343 error ("%s", string
);
5346 /* Walk a gimplified function and warn for functions whose return value is
5347 ignored and attribute((warn_unused_result)) is set. This is done before
5348 inlining, so we don't have to worry about that. */
5351 c_warn_unused_result (tree
*top_p
)
5354 tree_stmt_iterator i
;
5357 switch (TREE_CODE (t
))
5359 case STATEMENT_LIST
:
5360 for (i
= tsi_start (*top_p
); !tsi_end_p (i
); tsi_next (&i
))
5361 c_warn_unused_result (tsi_stmt_ptr (i
));
5365 c_warn_unused_result (&COND_EXPR_THEN (t
));
5366 c_warn_unused_result (&COND_EXPR_ELSE (t
));
5369 c_warn_unused_result (&BIND_EXPR_BODY (t
));
5371 case TRY_FINALLY_EXPR
:
5372 case TRY_CATCH_EXPR
:
5373 c_warn_unused_result (&TREE_OPERAND (t
, 0));
5374 c_warn_unused_result (&TREE_OPERAND (t
, 1));
5377 c_warn_unused_result (&CATCH_BODY (t
));
5379 case EH_FILTER_EXPR
:
5380 c_warn_unused_result (&EH_FILTER_FAILURE (t
));
5387 /* This is a naked call, as opposed to a CALL_EXPR nested inside
5388 a MODIFY_EXPR. All calls whose value is ignored should be
5389 represented like this. Look for the attribute. */
5390 fdecl
= get_callee_fndecl (t
);
5392 ftype
= TREE_TYPE (fdecl
);
5395 ftype
= TREE_TYPE (TREE_OPERAND (t
, 0));
5396 /* Look past pointer-to-function to the function type itself. */
5397 ftype
= TREE_TYPE (ftype
);
5400 if (lookup_attribute ("warn_unused_result", TYPE_ATTRIBUTES (ftype
)))
5403 warning ("%Hignoring return value of `%D', "
5404 "declared with attribute warn_unused_result",
5405 EXPR_LOCUS (t
), fdecl
);
5407 warning ("%Hignoring return value of function "
5408 "declared with attribute warn_unused_result",
5414 /* Not a container, not a call, or a call whose value is used. */
5419 #include "gt-c-common.h"