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_cst (NULL_TREE, ix), 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);
840 /* Compute the number of elements, for the array type. */
841 nchars = wide_flag ? length / wchar_bytes : length;
843 if (pedantic && nchars - 1 > nchars_max && !c_dialect_cxx ())
844 pedwarn ("string length `%d' is greater than the length `%d' ISO C%d compilers are required to support",
845 nchars - 1, nchars_max, flag_isoc99 ? 99 : 89);
847 e_type = wide_flag ? wchar_type_node : char_type_node;
848 /* Create the array type for the string constant.
849 -Wwrite-strings says make the string constant an array of const char
850 so that copying it to a non-const pointer will get a warning.
851 For C++, this is the standard behavior. */
852 if (flag_const_strings)
853 e_type = build_type_variant (e_type, 1, 0);
854 i_type = build_index_type (build_int_cst (NULL_TREE, nchars - 1));
855 TREE_TYPE (value) = build_array_type (e_type, i_type);
857 TREE_CONSTANT (value) = 1;
858 TREE_INVARIANT (value) = 1;
859 TREE_READONLY (value) = 1;
860 TREE_STATIC (value) = 1;
864 /* Print a warning if a constant expression had overflow in folding.
865 Invoke this function on every expression that the language
866 requires to be a constant expression.
867 Note the ANSI C standard says it is erroneous for a
868 constant expression to overflow. */
871 constant_expression_warning (tree value)
873 if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST
874 || TREE_CODE (value) == VECTOR_CST
875 || TREE_CODE (value) == COMPLEX_CST)
876 && TREE_CONSTANT_OVERFLOW (value) && pedantic)
877 pedwarn ("overflow in constant expression");
880 /* Print a warning if an expression had overflow in folding.
881 Invoke this function on every expression that
882 (1) appears in the source code, and
883 (2) might be a constant expression that overflowed, and
884 (3) is not already checked by convert_and_check;
885 however, do not invoke this function on operands of explicit casts. */
888 overflow_warning (tree value)
890 if ((TREE_CODE (value) == INTEGER_CST
891 || (TREE_CODE (value) == COMPLEX_CST
892 && TREE_CODE (TREE_REALPART (value)) == INTEGER_CST))
893 && TREE_OVERFLOW (value))
895 TREE_OVERFLOW (value) = 0;
896 if (skip_evaluation == 0)
897 warning ("integer overflow in expression");
899 else if ((TREE_CODE (value) == REAL_CST
900 || (TREE_CODE (value) == COMPLEX_CST
901 && TREE_CODE (TREE_REALPART (value)) == REAL_CST))
902 && TREE_OVERFLOW (value))
904 TREE_OVERFLOW (value) = 0;
905 if (skip_evaluation == 0)
906 warning ("floating point overflow in expression");
908 else if (TREE_CODE (value) == VECTOR_CST && TREE_OVERFLOW (value))
910 TREE_OVERFLOW (value) = 0;
911 if (skip_evaluation == 0)
912 warning ("vector overflow in expression");
916 /* Print a warning if a large constant is truncated to unsigned,
917 or if -Wconversion is used and a constant < 0 is converted to unsigned.
918 Invoke this function on every expression that might be implicitly
919 converted to an unsigned type. */
922 unsigned_conversion_warning (tree result, tree operand)
924 tree type = TREE_TYPE (result);
926 if (TREE_CODE (operand) == INTEGER_CST
927 && TREE_CODE (type) == INTEGER_TYPE
928 && TYPE_UNSIGNED (type)
929 && skip_evaluation == 0
930 && !int_fits_type_p (operand, type))
932 if (!int_fits_type_p (operand, c_common_signed_type (type)))
933 /* This detects cases like converting -129 or 256 to unsigned char. */
934 warning ("large integer implicitly truncated to unsigned type");
935 else if (warn_conversion)
936 warning ("negative integer implicitly converted to unsigned type");
940 /* Nonzero if constant C has a value that is permissible
941 for type TYPE (an INTEGER_TYPE). */
944 constant_fits_type_p (tree c, tree type)
946 if (TREE_CODE (c) == INTEGER_CST)
947 return int_fits_type_p (c, type);
949 c = convert (type, c);
950 return !TREE_OVERFLOW (c);
953 /* Nonzero if vector types T1 and T2 can be converted to each other
954 without an explicit cast. */
956 vector_types_convertible_p (tree t1, tree t2)
958 return targetm.vector_opaque_p (t1)
959 || targetm.vector_opaque_p (t2)
960 || (tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2))
961 && INTEGRAL_TYPE_P (TREE_TYPE (t1))
962 == INTEGRAL_TYPE_P (TREE_TYPE (t2)));
965 /* Convert EXPR to TYPE, warning about conversion problems with constants.
966 Invoke this function on every expression that is converted implicitly,
967 i.e. because of language rules and not because of an explicit cast. */
970 convert_and_check (tree type, tree expr)
972 tree t = convert (type, expr);
973 if (TREE_CODE (t) == INTEGER_CST)
975 if (TREE_OVERFLOW (t))
977 TREE_OVERFLOW (t) = 0;
979 /* Do not diagnose overflow in a constant expression merely
980 because a conversion overflowed. */
981 TREE_CONSTANT_OVERFLOW (t) = TREE_CONSTANT_OVERFLOW (expr);
983 /* No warning for converting 0x80000000 to int. */
984 if (!(TYPE_UNSIGNED (type) < TYPE_UNSIGNED (TREE_TYPE (expr))
985 && TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE
986 && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (expr))))
987 /* If EXPR fits in the unsigned version of TYPE,
988 don't warn unless pedantic. */
990 || TYPE_UNSIGNED (type)
991 || ! constant_fits_type_p (expr,
992 c_common_unsigned_type (type)))
993 && skip_evaluation == 0)
994 warning ("overflow in implicit constant conversion");
997 unsigned_conversion_warning (t, expr);
1002 /* A node in a list that describes references to variables (EXPR), which are
1003 either read accesses if WRITER is zero, or write accesses, in which case
1004 WRITER is the parent of EXPR. */
1011 /* Used to implement a cache the results of a call to verify_tree. We only
1012 use this for SAVE_EXPRs. */
1015 struct tlist_cache *next;
1016 struct tlist *cache_before_sp;
1017 struct tlist *cache_after_sp;
1021 /* Obstack to use when allocating tlist structures, and corresponding
1023 static struct obstack tlist_obstack;
1024 static char *tlist_firstobj = 0;
1026 /* Keep track of the identifiers we've warned about, so we can avoid duplicate
1028 static struct tlist *warned_ids;
1029 /* SAVE_EXPRs need special treatment. We process them only once and then
1030 cache the results. */
1031 static struct tlist_cache *save_expr_cache;
1033 static void add_tlist (struct tlist **, struct tlist *, tree, int);
1034 static void merge_tlist (struct tlist **, struct tlist *, int);
1035 static void verify_tree (tree, struct tlist **, struct tlist **, tree);
1036 static int warning_candidate_p (tree);
1037 static void warn_for_collisions (struct tlist *);
1038 static void warn_for_collisions_1 (tree, tree, struct tlist *, int);
1039 static struct tlist *new_tlist (struct tlist *, tree, tree);
1041 /* Create a new struct tlist and fill in its fields. */
1042 static struct tlist *
1043 new_tlist (struct tlist *next, tree t, tree writer)
1046 l = XOBNEW (&tlist_obstack, struct tlist);
1053 /* Add duplicates of the nodes found in ADD to the list *TO. If EXCLUDE_WRITER
1054 is nonnull, we ignore any node we find which has a writer equal to it. */
1057 add_tlist (struct tlist **to, struct tlist *add, tree exclude_writer, int copy)
1061 struct tlist *next = add->next;
1064 if (! exclude_writer || add->writer != exclude_writer)
1065 *to = copy ? new_tlist (*to, add->expr, add->writer) : add;
1070 /* Merge the nodes of ADD into TO. This merging process is done so that for
1071 each variable that already exists in TO, no new node is added; however if
1072 there is a write access recorded in ADD, and an occurrence on TO is only
1073 a read access, then the occurrence in TO will be modified to record the
1077 merge_tlist (struct tlist **to, struct tlist *add, int copy)
1079 struct tlist **end = to;
1082 end = &(*end)->next;
1088 struct tlist *next = add->next;
1090 for (tmp2 = *to; tmp2; tmp2 = tmp2->next)
1091 if (tmp2->expr == add->expr)
1095 tmp2->writer = add->writer;
1099 *end = copy ? add : new_tlist (NULL, add->expr, add->writer);
1100 end = &(*end)->next;
1107 /* WRITTEN is a variable, WRITER is its parent. Warn if any of the variable
1108 references in list LIST conflict with it, excluding reads if ONLY writers
1112 warn_for_collisions_1 (tree written, tree writer, struct tlist *list,
1117 /* Avoid duplicate warnings. */
1118 for (tmp = warned_ids; tmp; tmp = tmp->next)
1119 if (tmp->expr == written)
1124 if (list->expr == written
1125 && list->writer != writer
1126 && (! only_writes || list->writer)
1127 && DECL_NAME (list->expr))
1129 warned_ids = new_tlist (warned_ids, written, NULL_TREE);
1130 warning ("operation on `%s' may be undefined",
1131 IDENTIFIER_POINTER (DECL_NAME (list->expr)));
1137 /* Given a list LIST of references to variables, find whether any of these
1138 can cause conflicts due to missing sequence points. */
1141 warn_for_collisions (struct tlist *list)
1145 for (tmp = list; tmp; tmp = tmp->next)
1148 warn_for_collisions_1 (tmp->expr, tmp->writer, list, 0);
1152 /* Return nonzero if X is a tree that can be verified by the sequence point
1155 warning_candidate_p (tree x)
1157 return TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == PARM_DECL;
1160 /* Walk the tree X, and record accesses to variables. If X is written by the
1161 parent tree, WRITER is the parent.
1162 We store accesses in one of the two lists: PBEFORE_SP, and PNO_SP. If this
1163 expression or its only operand forces a sequence point, then everything up
1164 to the sequence point is stored in PBEFORE_SP. Everything else gets stored
1166 Once we return, we will have emitted warnings if any subexpression before
1167 such a sequence point could be undefined. On a higher level, however, the
1168 sequence point may not be relevant, and we'll merge the two lists.
1170 Example: (b++, a) + b;
1171 The call that processes the COMPOUND_EXPR will store the increment of B
1172 in PBEFORE_SP, and the use of A in PNO_SP. The higher-level call that
1173 processes the PLUS_EXPR will need to merge the two lists so that
1174 eventually, all accesses end up on the same list (and we'll warn about the
1175 unordered subexpressions b++ and b.
1177 A note on merging. If we modify the former example so that our expression
1180 care must be taken not simply to add all three expressions into the final
1181 PNO_SP list. The function merge_tlist takes care of that by merging the
1182 before-SP list of the COMPOUND_EXPR into its after-SP list in a special
1183 way, so that no more than one access to B is recorded. */
1186 verify_tree (tree x, struct tlist **pbefore_sp, struct tlist **pno_sp,
1189 struct tlist *tmp_before, *tmp_nosp, *tmp_list2, *tmp_list3;
1190 enum tree_code code;
1193 /* X may be NULL if it is the operand of an empty statement expression
1199 code = TREE_CODE (x);
1200 cl = TREE_CODE_CLASS (code);
1202 if (warning_candidate_p (x))
1204 *pno_sp = new_tlist (*pno_sp, x, writer);
1214 case TRUTH_ANDIF_EXPR:
1215 case TRUTH_ORIF_EXPR:
1216 tmp_before = tmp_nosp = tmp_list3 = 0;
1217 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE);
1218 warn_for_collisions (tmp_nosp);
1219 merge_tlist (pbefore_sp, tmp_before, 0);
1220 merge_tlist (pbefore_sp, tmp_nosp, 0);
1221 verify_tree (TREE_OPERAND (x, 1), &tmp_list3, pno_sp, NULL_TREE);
1222 merge_tlist (pbefore_sp, tmp_list3, 0);
1226 tmp_before = tmp_list2 = 0;
1227 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_list2, NULL_TREE);
1228 warn_for_collisions (tmp_list2);
1229 merge_tlist (pbefore_sp, tmp_before, 0);
1230 merge_tlist (pbefore_sp, tmp_list2, 1);
1232 tmp_list3 = tmp_nosp = 0;
1233 verify_tree (TREE_OPERAND (x, 1), &tmp_list3, &tmp_nosp, NULL_TREE);
1234 warn_for_collisions (tmp_nosp);
1235 merge_tlist (pbefore_sp, tmp_list3, 0);
1237 tmp_list3 = tmp_list2 = 0;
1238 verify_tree (TREE_OPERAND (x, 2), &tmp_list3, &tmp_list2, NULL_TREE);
1239 warn_for_collisions (tmp_list2);
1240 merge_tlist (pbefore_sp, tmp_list3, 0);
1241 /* Rather than add both tmp_nosp and tmp_list2, we have to merge the
1242 two first, to avoid warning for (a ? b++ : b++). */
1243 merge_tlist (&tmp_nosp, tmp_list2, 0);
1244 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
1247 case PREDECREMENT_EXPR:
1248 case PREINCREMENT_EXPR:
1249 case POSTDECREMENT_EXPR:
1250 case POSTINCREMENT_EXPR:
1251 verify_tree (TREE_OPERAND (x, 0), pno_sp, pno_sp, x);
1255 tmp_before = tmp_nosp = tmp_list3 = 0;
1256 verify_tree (TREE_OPERAND (x, 1), &tmp_before, &tmp_nosp, NULL_TREE);
1257 verify_tree (TREE_OPERAND (x, 0), &tmp_list3, &tmp_list3, x);
1258 /* Expressions inside the LHS are not ordered wrt. the sequence points
1259 in the RHS. Example:
1261 Despite the fact that the modification of "a" is in the before_sp
1262 list (tmp_before), it conflicts with the use of "a" in the LHS.
1263 We can handle this by adding the contents of tmp_list3
1264 to those of tmp_before, and redoing the collision warnings for that
1266 add_tlist (&tmp_before, tmp_list3, x, 1);
1267 warn_for_collisions (tmp_before);
1268 /* Exclude the LHS itself here; we first have to merge it into the
1269 tmp_nosp list. This is done to avoid warning for "a = a"; if we
1270 didn't exclude the LHS, we'd get it twice, once as a read and once
1272 add_tlist (pno_sp, tmp_list3, x, 0);
1273 warn_for_collisions_1 (TREE_OPERAND (x, 0), x, tmp_nosp, 1);
1275 merge_tlist (pbefore_sp, tmp_before, 0);
1276 if (warning_candidate_p (TREE_OPERAND (x, 0)))
1277 merge_tlist (&tmp_nosp, new_tlist (NULL, TREE_OPERAND (x, 0), x), 0);
1278 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 1);
1282 /* We need to warn about conflicts among arguments and conflicts between
1283 args and the function address. Side effects of the function address,
1284 however, are not ordered by the sequence point of the call. */
1285 tmp_before = tmp_nosp = tmp_list2 = tmp_list3 = 0;
1286 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE);
1287 if (TREE_OPERAND (x, 1))
1288 verify_tree (TREE_OPERAND (x, 1), &tmp_list2, &tmp_list3, NULL_TREE);
1289 merge_tlist (&tmp_list3, tmp_list2, 0);
1290 add_tlist (&tmp_before, tmp_list3, NULL_TREE, 0);
1291 add_tlist (&tmp_before, tmp_nosp, NULL_TREE, 0);
1292 warn_for_collisions (tmp_before);
1293 add_tlist (pbefore_sp, tmp_before, NULL_TREE, 0);
1297 /* Scan all the list, e.g. indices of multi dimensional array. */
1300 tmp_before = tmp_nosp = 0;
1301 verify_tree (TREE_VALUE (x), &tmp_before, &tmp_nosp, NULL_TREE);
1302 merge_tlist (&tmp_nosp, tmp_before, 0);
1303 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
1310 struct tlist_cache *t;
1311 for (t = save_expr_cache; t; t = t->next)
1317 t = XOBNEW (&tlist_obstack, struct tlist_cache);
1318 t->next = save_expr_cache;
1320 save_expr_cache = t;
1322 tmp_before = tmp_nosp = 0;
1323 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE);
1324 warn_for_collisions (tmp_nosp);
1329 struct tlist *t = tmp_nosp;
1331 merge_tlist (&tmp_list3, t, 0);
1333 t->cache_before_sp = tmp_before;
1334 t->cache_after_sp = tmp_list3;
1336 merge_tlist (pbefore_sp, t->cache_before_sp, 1);
1337 add_tlist (pno_sp, t->cache_after_sp, NULL_TREE, 1);
1346 if (first_rtl_op (code) == 0)
1348 x = TREE_OPERAND (x, 0);
1363 int max = first_rtl_op (TREE_CODE (x));
1364 for (lp = 0; lp < max; lp++)
1366 tmp_before = tmp_nosp = 0;
1367 verify_tree (TREE_OPERAND (x, lp), &tmp_before, &tmp_nosp, NULL_TREE);
1368 merge_tlist (&tmp_nosp, tmp_before, 0);
1369 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
1376 /* Try to warn for undefined behavior in EXPR due to missing sequence
1380 verify_sequence_points (tree expr)
1382 struct tlist *before_sp = 0, *after_sp = 0;
1385 save_expr_cache = 0;
1386 if (tlist_firstobj == 0)
1388 gcc_obstack_init (&tlist_obstack);
1389 tlist_firstobj = (char *) obstack_alloc (&tlist_obstack, 0);
1392 verify_tree (expr, &before_sp, &after_sp, 0);
1393 warn_for_collisions (after_sp);
1394 obstack_free (&tlist_obstack, tlist_firstobj);
1397 /* Validate the expression after `case' and apply default promotions. */
1400 check_case_value (tree value)
1402 if (value == NULL_TREE)
1405 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
1406 STRIP_TYPE_NOPS (value);
1407 /* In C++, the following is allowed:
1410 switch (...) { case i: ... }
1412 So, we try to reduce the VALUE to a constant that way. */
1413 if (c_dialect_cxx ())
1415 value = decl_constant_value (value);
1416 STRIP_TYPE_NOPS (value);
1417 value = fold (value);
1420 if (TREE_CODE (value) != INTEGER_CST
1421 && value != error_mark_node)
1423 error ("case label does not reduce to an integer constant");
1424 value = error_mark_node;
1427 /* Promote char or short to int. */
1428 value = default_conversion (value);
1430 constant_expression_warning (value);
1435 /* See if the case values LOW and HIGH are in the range of the original
1436 type (ie. before the default conversion to int) of the switch testing
1438 TYPE is the promoted type of the testing expression, and ORIG_TYPE is
1439 the type before promiting it. CASE_LOW_P is a pointer to the lower
1440 bound of the case label, and CASE_HIGH_P is the upper bound or NULL
1441 if the case is not a case range.
1442 The caller has to make sure that we are not called with NULL for
1443 CASE_LOW_P (ie. the defualt case).
1444 Returns true if the case label is in range of ORIG_TYPE (satured or
1445 untouched) or false if the label is out of range. */
1448 check_case_bounds (tree type, tree orig_type,
1449 tree *case_low_p, tree *case_high_p)
1451 tree min_value, max_value;
1452 tree case_low = *case_low_p;
1453 tree case_high = case_high_p ? *case_high_p : case_low;
1455 /* If there was a problem with the original type, do nothing. */
1456 if (orig_type == error_mark_node)
1459 min_value = TYPE_MIN_VALUE (orig_type);
1460 max_value = TYPE_MAX_VALUE (orig_type);
1462 /* Case label is less than minimum for type. */
1463 if (tree_int_cst_compare (case_low, min_value) < 0
1464 && tree_int_cst_compare (case_high, min_value) < 0)
1466 warning ("case label value is less than minimum value for type");
1470 /* Case value is greater than maximum for type. */
1471 if (tree_int_cst_compare (case_low, max_value) > 0
1472 && tree_int_cst_compare (case_high, max_value) > 0)
1474 warning ("case label value exceeds maximum value for type");
1478 /* Saturate lower case label value to minimum. */
1479 if (tree_int_cst_compare (case_high, min_value) >= 0
1480 && tree_int_cst_compare (case_low, min_value) < 0)
1482 warning ("lower value in case label range"
1483 " less than minimum value for type");
1484 case_low = min_value;
1487 /* Saturate upper case label value to maximum. */
1488 if (tree_int_cst_compare (case_low, max_value) <= 0
1489 && tree_int_cst_compare (case_high, max_value) > 0)
1491 warning ("upper value in case label range"
1492 " exceeds maximum value for type");
1493 case_high = max_value;
1496 if (*case_low_p != case_low)
1497 *case_low_p = convert (type, case_low);
1498 if (case_high_p && *case_high_p != case_high)
1499 *case_high_p = convert (type, case_high);
1504 /* Return an integer type with BITS bits of precision,
1505 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
1508 c_common_type_for_size (unsigned int bits, int unsignedp)
1510 if (bits == TYPE_PRECISION (integer_type_node))
1511 return unsignedp ? unsigned_type_node : integer_type_node;
1513 if (bits == TYPE_PRECISION (signed_char_type_node))
1514 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
1516 if (bits == TYPE_PRECISION (short_integer_type_node))
1517 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
1519 if (bits == TYPE_PRECISION (long_integer_type_node))
1520 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
1522 if (bits == TYPE_PRECISION (long_long_integer_type_node))
1523 return (unsignedp ? long_long_unsigned_type_node
1524 : long_long_integer_type_node);
1526 if (bits == TYPE_PRECISION (widest_integer_literal_type_node))
1527 return (unsignedp ? widest_unsigned_literal_type_node
1528 : widest_integer_literal_type_node);
1530 if (bits <= TYPE_PRECISION (intQI_type_node))
1531 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
1533 if (bits <= TYPE_PRECISION (intHI_type_node))
1534 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
1536 if (bits <= TYPE_PRECISION (intSI_type_node))
1537 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
1539 if (bits <= TYPE_PRECISION (intDI_type_node))
1540 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
1545 /* Used for communication between c_common_type_for_mode and
1546 c_register_builtin_type. */
1547 static GTY(()) tree registered_builtin_types;
1549 /* Return a data type that has machine mode MODE.
1550 If the mode is an integer,
1551 then UNSIGNEDP selects between signed and unsigned types. */
1554 c_common_type_for_mode (enum machine_mode mode, int unsignedp)
1558 if (mode == TYPE_MODE (integer_type_node))
1559 return unsignedp ? unsigned_type_node : integer_type_node;
1561 if (mode == TYPE_MODE (signed_char_type_node))
1562 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
1564 if (mode == TYPE_MODE (short_integer_type_node))
1565 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
1567 if (mode == TYPE_MODE (long_integer_type_node))
1568 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
1570 if (mode == TYPE_MODE (long_long_integer_type_node))
1571 return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node;
1573 if (mode == TYPE_MODE (widest_integer_literal_type_node))
1574 return unsignedp ? widest_unsigned_literal_type_node
1575 : widest_integer_literal_type_node;
1578 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
1581 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
1584 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
1587 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
1589 #if HOST_BITS_PER_WIDE_INT >= 64
1590 if (mode == TYPE_MODE (intTI_type_node))
1591 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
1594 if (mode == TYPE_MODE (float_type_node))
1595 return float_type_node;
1597 if (mode == TYPE_MODE (double_type_node))
1598 return double_type_node;
1600 if (mode == TYPE_MODE (long_double_type_node))
1601 return long_double_type_node;
1603 if (mode == TYPE_MODE (void_type_node))
1604 return void_type_node;
1606 if (mode == TYPE_MODE (build_pointer_type (char_type_node)))
1607 return unsignedp ? make_unsigned_type (mode) : make_signed_type (mode);
1609 if (mode == TYPE_MODE (build_pointer_type (integer_type_node)))
1610 return unsignedp ? make_unsigned_type (mode) : make_signed_type (mode);
1612 if (VECTOR_MODE_P (mode))
1614 enum machine_mode inner_mode = GET_MODE_INNER (mode);
1615 tree inner_type = c_common_type_for_mode (inner_mode, unsignedp);
1616 if (inner_type != NULL_TREE)
1617 return build_vector_type_for_mode (inner_type, mode);
1620 for (t = registered_builtin_types; t; t = TREE_CHAIN (t))
1621 if (TYPE_MODE (TREE_VALUE (t)) == mode)
1622 return TREE_VALUE (t);
1627 /* Return an unsigned type the same as TYPE in other respects. */
1629 c_common_unsigned_type (tree type)
1631 tree type1 = TYPE_MAIN_VARIANT (type);
1632 if (type1 == signed_char_type_node || type1 == char_type_node)
1633 return unsigned_char_type_node;
1634 if (type1 == integer_type_node)
1635 return unsigned_type_node;
1636 if (type1 == short_integer_type_node)
1637 return short_unsigned_type_node;
1638 if (type1 == long_integer_type_node)
1639 return long_unsigned_type_node;
1640 if (type1 == long_long_integer_type_node)
1641 return long_long_unsigned_type_node;
1642 if (type1 == widest_integer_literal_type_node)
1643 return widest_unsigned_literal_type_node;
1644 #if HOST_BITS_PER_WIDE_INT >= 64
1645 if (type1 == intTI_type_node)
1646 return unsigned_intTI_type_node;
1648 if (type1 == intDI_type_node)
1649 return unsigned_intDI_type_node;
1650 if (type1 == intSI_type_node)
1651 return unsigned_intSI_type_node;
1652 if (type1 == intHI_type_node)
1653 return unsigned_intHI_type_node;
1654 if (type1 == intQI_type_node)
1655 return unsigned_intQI_type_node;
1657 return c_common_signed_or_unsigned_type (1, type);
1660 /* Return a signed type the same as TYPE in other respects. */
1663 c_common_signed_type (tree type)
1665 tree type1 = TYPE_MAIN_VARIANT (type);
1666 if (type1 == unsigned_char_type_node || type1 == char_type_node)
1667 return signed_char_type_node;
1668 if (type1 == unsigned_type_node)
1669 return integer_type_node;
1670 if (type1 == short_unsigned_type_node)
1671 return short_integer_type_node;
1672 if (type1 == long_unsigned_type_node)
1673 return long_integer_type_node;
1674 if (type1 == long_long_unsigned_type_node)
1675 return long_long_integer_type_node;
1676 if (type1 == widest_unsigned_literal_type_node)
1677 return widest_integer_literal_type_node;
1678 #if HOST_BITS_PER_WIDE_INT >= 64
1679 if (type1 == unsigned_intTI_type_node)
1680 return intTI_type_node;
1682 if (type1 == unsigned_intDI_type_node)
1683 return intDI_type_node;
1684 if (type1 == unsigned_intSI_type_node)
1685 return intSI_type_node;
1686 if (type1 == unsigned_intHI_type_node)
1687 return intHI_type_node;
1688 if (type1 == unsigned_intQI_type_node)
1689 return intQI_type_node;
1691 return c_common_signed_or_unsigned_type (0, type);
1694 /* Return a type the same as TYPE except unsigned or
1695 signed according to UNSIGNEDP. */
1698 c_common_signed_or_unsigned_type (int unsignedp, tree type)
1700 if (! INTEGRAL_TYPE_P (type)
1701 || TYPE_UNSIGNED (type) == unsignedp)
1704 /* For ENUMERAL_TYPEs in C++, must check the mode of the types, not
1705 the precision; they have precision set to match their range, but
1706 may use a wider mode to match an ABI. If we change modes, we may
1707 wind up with bad conversions. For INTEGER_TYPEs in C, must check
1708 the precision as well, so as to yield correct results for
1709 bit-field types. C++ does not have these separate bit-field
1710 types, and producing a signed or unsigned variant of an
1711 ENUMERAL_TYPE may cause other problems as well. */
1713 #define TYPE_OK(node) \
1714 (TYPE_MODE (type) == TYPE_MODE (node) \
1715 && (c_dialect_cxx () || TYPE_PRECISION (type) == TYPE_PRECISION (node)))
1716 if (TYPE_OK (signed_char_type_node))
1717 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
1718 if (TYPE_OK (integer_type_node))
1719 return unsignedp ? unsigned_type_node : integer_type_node;
1720 if (TYPE_OK (short_integer_type_node))
1721 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
1722 if (TYPE_OK (long_integer_type_node))
1723 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
1724 if (TYPE_OK (long_long_integer_type_node))
1725 return (unsignedp ? long_long_unsigned_type_node
1726 : long_long_integer_type_node);
1727 if (TYPE_OK (widest_integer_literal_type_node))
1728 return (unsignedp ? widest_unsigned_literal_type_node
1729 : widest_integer_literal_type_node);
1731 #if HOST_BITS_PER_WIDE_INT >= 64
1732 if (TYPE_OK (intTI_type_node))
1733 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
1735 if (TYPE_OK (intDI_type_node))
1736 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
1737 if (TYPE_OK (intSI_type_node))
1738 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
1739 if (TYPE_OK (intHI_type_node))
1740 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
1741 if (TYPE_OK (intQI_type_node))
1742 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
1745 if (c_dialect_cxx ())
1748 return build_nonstandard_integer_type (TYPE_PRECISION (type), unsignedp);
1751 /* The C version of the register_builtin_type langhook. */
1754 c_register_builtin_type (tree type, const char* name)
1758 decl = build_decl (TYPE_DECL, get_identifier (name), type);
1759 DECL_ARTIFICIAL (decl) = 1;
1760 if (!TYPE_NAME (type))
1761 TYPE_NAME (type) = decl;
1764 registered_builtin_types = tree_cons (0, type, registered_builtin_types);
1768 /* Return the minimum number of bits needed to represent VALUE in a
1769 signed or unsigned type, UNSIGNEDP says which. */
1772 min_precision (tree value, int unsignedp)
1776 /* If the value is negative, compute its negative minus 1. The latter
1777 adjustment is because the absolute value of the largest negative value
1778 is one larger than the largest positive value. This is equivalent to
1779 a bit-wise negation, so use that operation instead. */
1781 if (tree_int_cst_sgn (value) < 0)
1782 value = fold (build1 (BIT_NOT_EXPR, TREE_TYPE (value), value));
1784 /* Return the number of bits needed, taking into account the fact
1785 that we need one more bit for a signed than unsigned type. */
1787 if (integer_zerop (value))
1790 log = tree_floor_log2 (value);
1792 return log + 1 + ! unsignedp;
1795 /* Print an error message for invalid operands to arith operation
1796 CODE. NOP_EXPR is used as a special case (see
1797 c_common_truthvalue_conversion). */
1800 binary_op_error (enum tree_code code)
1807 error ("invalid truth-value expression");
1811 opname = "+"; break;
1813 opname = "-"; break;
1815 opname = "*"; break;
1817 opname = "max"; break;
1819 opname = "min"; break;
1821 opname = "=="; break;
1823 opname = "!="; break;
1825 opname = "<="; break;
1827 opname = ">="; break;
1829 opname = "<"; break;
1831 opname = ">"; break;
1833 opname = "<<"; break;
1835 opname = ">>"; break;
1836 case TRUNC_MOD_EXPR:
1837 case FLOOR_MOD_EXPR:
1838 opname = "%"; break;
1839 case TRUNC_DIV_EXPR:
1840 case FLOOR_DIV_EXPR:
1841 opname = "/"; break;
1843 opname = "&"; break;
1845 opname = "|"; break;
1846 case TRUTH_ANDIF_EXPR:
1847 opname = "&&"; break;
1848 case TRUTH_ORIF_EXPR:
1849 opname = "||"; break;
1851 opname = "^"; break;
1854 opname = "rotate"; break;
1856 opname = "unknown"; break;
1858 error ("invalid operands to binary %s", opname);
1861 /* Subroutine of build_binary_op, used for comparison operations.
1862 See if the operands have both been converted from subword integer types
1863 and, if so, perhaps change them both back to their original type.
1864 This function is also responsible for converting the two operands
1865 to the proper common type for comparison.
1867 The arguments of this function are all pointers to local variables
1868 of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1,
1869 RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE.
1871 If this function returns nonzero, it means that the comparison has
1872 a constant value. What this function returns is an expression for
1876 shorten_compare (tree *op0_ptr, tree *op1_ptr, tree *restype_ptr,
1877 enum tree_code *rescode_ptr)
1880 tree op0 = *op0_ptr;
1881 tree op1 = *op1_ptr;
1882 int unsignedp0, unsignedp1;
1884 tree primop0, primop1;
1885 enum tree_code code = *rescode_ptr;
1887 /* Throw away any conversions to wider types
1888 already present in the operands. */
1890 primop0 = get_narrower (op0, &unsignedp0);
1891 primop1 = get_narrower (op1, &unsignedp1);
1893 /* Handle the case that OP0 does not *contain* a conversion
1894 but it *requires* conversion to FINAL_TYPE. */
1896 if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr)
1897 unsignedp0 = TYPE_UNSIGNED (TREE_TYPE (op0));
1898 if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr)
1899 unsignedp1 = TYPE_UNSIGNED (TREE_TYPE (op1));
1901 /* If one of the operands must be floated, we cannot optimize. */
1902 real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE;
1903 real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE;
1905 /* If first arg is constant, swap the args (changing operation
1906 so value is preserved), for canonicalization. Don't do this if
1907 the second arg is 0. */
1909 if (TREE_CONSTANT (primop0)
1910 && ! integer_zerop (primop1) && ! real_zerop (primop1))
1913 int temi = unsignedp0;
1921 unsignedp0 = unsignedp1;
1944 *rescode_ptr = code;
1947 /* If comparing an integer against a constant more bits wide,
1948 maybe we can deduce a value of 1 or 0 independent of the data.
1949 Or else truncate the constant now
1950 rather than extend the variable at run time.
1952 This is only interesting if the constant is the wider arg.
1953 Also, it is not safe if the constant is unsigned and the
1954 variable arg is signed, since in this case the variable
1955 would be sign-extended and then regarded as unsigned.
1956 Our technique fails in this case because the lowest/highest
1957 possible unsigned results don't follow naturally from the
1958 lowest/highest possible values of the variable operand.
1959 For just EQ_EXPR and NE_EXPR there is another technique that
1960 could be used: see if the constant can be faithfully represented
1961 in the other operand's type, by truncating it and reextending it
1962 and see if that preserves the constant's value. */
1964 if (!real1 && !real2
1965 && TREE_CODE (primop1) == INTEGER_CST
1966 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr))
1968 int min_gt, max_gt, min_lt, max_lt;
1969 tree maxval, minval;
1970 /* 1 if comparison is nominally unsigned. */
1971 int unsignedp = TYPE_UNSIGNED (*restype_ptr);
1974 type = c_common_signed_or_unsigned_type (unsignedp0,
1975 TREE_TYPE (primop0));
1977 /* In C, if TYPE is an enumeration, then we need to get its
1978 min/max values from its underlying integral type, not the
1979 enumerated type itself. In C++, TYPE_MAX_VALUE and
1980 TYPE_MIN_VALUE have already been set correctly on the
1981 enumeration type. */
1982 if (!c_dialect_cxx() && TREE_CODE (type) == ENUMERAL_TYPE)
1983 type = c_common_type_for_size (TYPE_PRECISION (type), unsignedp0);
1985 maxval = TYPE_MAX_VALUE (type);
1986 minval = TYPE_MIN_VALUE (type);
1988 if (unsignedp && !unsignedp0)
1989 *restype_ptr = c_common_signed_type (*restype_ptr);
1991 if (TREE_TYPE (primop1) != *restype_ptr)
1993 /* Convert primop1 to target type, but do not introduce
1994 additional overflow. We know primop1 is an int_cst. */
1995 tree tmp = build_int_cst_wide (*restype_ptr,
1996 TREE_INT_CST_LOW (primop1),
1997 TREE_INT_CST_HIGH (primop1));
1999 primop1 = force_fit_type (tmp, 0, TREE_OVERFLOW (primop1),
2000 TREE_CONSTANT_OVERFLOW (primop1));
2002 if (type != *restype_ptr)
2004 minval = convert (*restype_ptr, minval);
2005 maxval = convert (*restype_ptr, maxval);
2008 if (unsignedp && unsignedp0)
2010 min_gt = INT_CST_LT_UNSIGNED (primop1, minval);
2011 max_gt = INT_CST_LT_UNSIGNED (primop1, maxval);
2012 min_lt = INT_CST_LT_UNSIGNED (minval, primop1);
2013 max_lt = INT_CST_LT_UNSIGNED (maxval, primop1);
2017 min_gt = INT_CST_LT (primop1, minval);
2018 max_gt = INT_CST_LT (primop1, maxval);
2019 min_lt = INT_CST_LT (minval, primop1);
2020 max_lt = INT_CST_LT (maxval, primop1);
2024 /* This used to be a switch, but Genix compiler can't handle that. */
2025 if (code == NE_EXPR)
2027 if (max_lt || min_gt)
2028 val = truthvalue_true_node;
2030 else if (code == EQ_EXPR)
2032 if (max_lt || min_gt)
2033 val = truthvalue_false_node;
2035 else if (code == LT_EXPR)
2038 val = truthvalue_true_node;
2040 val = truthvalue_false_node;
2042 else if (code == GT_EXPR)
2045 val = truthvalue_true_node;
2047 val = truthvalue_false_node;
2049 else if (code == LE_EXPR)
2052 val = truthvalue_true_node;
2054 val = truthvalue_false_node;
2056 else if (code == GE_EXPR)
2059 val = truthvalue_true_node;
2061 val = truthvalue_false_node;
2064 /* If primop0 was sign-extended and unsigned comparison specd,
2065 we did a signed comparison above using the signed type bounds.
2066 But the comparison we output must be unsigned.
2068 Also, for inequalities, VAL is no good; but if the signed
2069 comparison had *any* fixed result, it follows that the
2070 unsigned comparison just tests the sign in reverse
2071 (positive values are LE, negative ones GE).
2072 So we can generate an unsigned comparison
2073 against an extreme value of the signed type. */
2075 if (unsignedp && !unsignedp0)
2082 primop1 = TYPE_MIN_VALUE (type);
2088 primop1 = TYPE_MAX_VALUE (type);
2095 type = c_common_unsigned_type (type);
2098 if (TREE_CODE (primop0) != INTEGER_CST)
2100 if (val == truthvalue_false_node)
2101 warning ("comparison is always false due to limited range of data type");
2102 if (val == truthvalue_true_node)
2103 warning ("comparison is always true due to limited range of data type");
2108 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
2109 if (TREE_SIDE_EFFECTS (primop0))
2110 return build2 (COMPOUND_EXPR, TREE_TYPE (val), primop0, val);
2114 /* Value is not predetermined, but do the comparison
2115 in the type of the operand that is not constant.
2116 TYPE is already properly set. */
2118 else if (real1 && real2
2119 && (TYPE_PRECISION (TREE_TYPE (primop0))
2120 == TYPE_PRECISION (TREE_TYPE (primop1))))
2121 type = TREE_TYPE (primop0);
2123 /* If args' natural types are both narrower than nominal type
2124 and both extend in the same manner, compare them
2125 in the type of the wider arg.
2126 Otherwise must actually extend both to the nominal
2127 common type lest different ways of extending
2129 (eg, (short)-1 == (unsigned short)-1 should be 0.) */
2131 else if (unsignedp0 == unsignedp1 && real1 == real2
2132 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)
2133 && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr))
2135 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1));
2136 type = c_common_signed_or_unsigned_type (unsignedp0
2137 || TYPE_UNSIGNED (*restype_ptr),
2139 /* Make sure shorter operand is extended the right way
2140 to match the longer operand. */
2142 = convert (c_common_signed_or_unsigned_type (unsignedp0,
2143 TREE_TYPE (primop0)),
2146 = convert (c_common_signed_or_unsigned_type (unsignedp1,
2147 TREE_TYPE (primop1)),
2152 /* Here we must do the comparison on the nominal type
2153 using the args exactly as we received them. */
2154 type = *restype_ptr;
2158 if (!real1 && !real2 && integer_zerop (primop1)
2159 && TYPE_UNSIGNED (*restype_ptr))
2165 /* All unsigned values are >= 0, so we warn if extra warnings
2166 are requested. However, if OP0 is a constant that is
2167 >= 0, the signedness of the comparison isn't an issue,
2168 so suppress the warning. */
2169 if (extra_warnings && !in_system_header
2170 && ! (TREE_CODE (primop0) == INTEGER_CST
2171 && ! TREE_OVERFLOW (convert (c_common_signed_type (type),
2173 warning ("comparison of unsigned expression >= 0 is always true");
2174 value = truthvalue_true_node;
2178 if (extra_warnings && !in_system_header
2179 && ! (TREE_CODE (primop0) == INTEGER_CST
2180 && ! TREE_OVERFLOW (convert (c_common_signed_type (type),
2182 warning ("comparison of unsigned expression < 0 is always false");
2183 value = truthvalue_false_node;
2192 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
2193 if (TREE_SIDE_EFFECTS (primop0))
2194 return build2 (COMPOUND_EXPR, TREE_TYPE (value),
2201 *op0_ptr = convert (type, primop0);
2202 *op1_ptr = convert (type, primop1);
2204 *restype_ptr = truthvalue_type_node;
2209 /* Return a tree for the sum or difference (RESULTCODE says which)
2210 of pointer PTROP and integer INTOP. */
2213 pointer_int_sum (enum tree_code resultcode, tree ptrop, tree intop)
2217 /* The result is a pointer of the same type that is being added. */
2219 tree result_type = TREE_TYPE (ptrop);
2221 if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE)
2223 if (pedantic || warn_pointer_arith)
2224 pedwarn ("pointer of type `void *' used in arithmetic");
2225 size_exp = integer_one_node;
2227 else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE)
2229 if (pedantic || warn_pointer_arith)
2230 pedwarn ("pointer to a function used in arithmetic");
2231 size_exp = integer_one_node;
2233 else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE)
2235 if (pedantic || warn_pointer_arith)
2236 pedwarn ("pointer to member function used in arithmetic");
2237 size_exp = integer_one_node;
2240 size_exp = size_in_bytes (TREE_TYPE (result_type));
2242 /* If what we are about to multiply by the size of the elements
2243 contains a constant term, apply distributive law
2244 and multiply that constant term separately.
2245 This helps produce common subexpressions. */
2247 if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR)
2248 && ! TREE_CONSTANT (intop)
2249 && TREE_CONSTANT (TREE_OPERAND (intop, 1))
2250 && TREE_CONSTANT (size_exp)
2251 /* If the constant comes from pointer subtraction,
2252 skip this optimization--it would cause an error. */
2253 && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE
2254 /* If the constant is unsigned, and smaller than the pointer size,
2255 then we must skip this optimization. This is because it could cause
2256 an overflow error if the constant is negative but INTOP is not. */
2257 && (! TYPE_UNSIGNED (TREE_TYPE (intop))
2258 || (TYPE_PRECISION (TREE_TYPE (intop))
2259 == TYPE_PRECISION (TREE_TYPE (ptrop)))))
2261 enum tree_code subcode = resultcode;
2262 tree int_type = TREE_TYPE (intop);
2263 if (TREE_CODE (intop) == MINUS_EXPR)
2264 subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR);
2265 /* Convert both subexpression types to the type of intop,
2266 because weird cases involving pointer arithmetic
2267 can result in a sum or difference with different type args. */
2268 ptrop = build_binary_op (subcode, ptrop,
2269 convert (int_type, TREE_OPERAND (intop, 1)), 1);
2270 intop = convert (int_type, TREE_OPERAND (intop, 0));
2273 /* Convert the integer argument to a type the same size as sizetype
2274 so the multiply won't overflow spuriously. */
2276 if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype)
2277 || TYPE_UNSIGNED (TREE_TYPE (intop)) != TYPE_UNSIGNED (sizetype))
2278 intop = convert (c_common_type_for_size (TYPE_PRECISION (sizetype),
2279 TYPE_UNSIGNED (sizetype)), intop);
2281 /* Replace the integer argument with a suitable product by the object size.
2282 Do this multiplication as signed, then convert to the appropriate
2283 pointer type (actually unsigned integral). */
2285 intop = convert (result_type,
2286 build_binary_op (MULT_EXPR, intop,
2287 convert (TREE_TYPE (intop), size_exp), 1));
2289 /* Create the sum or difference. */
2290 return fold (build2 (resultcode, result_type, ptrop, intop));
2293 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
2294 or validate its data type for an `if' or `while' statement or ?..: exp.
2296 This preparation consists of taking the ordinary
2297 representation of an expression expr and producing a valid tree
2298 boolean expression describing whether expr is nonzero. We could
2299 simply always do build_binary_op (NE_EXPR, expr, truthvalue_false_node, 1),
2300 but we optimize comparisons, &&, ||, and !.
2302 The resulting type should always be `truthvalue_type_node'. */
2305 c_common_truthvalue_conversion (tree expr)
2307 if (TREE_CODE (expr) == ERROR_MARK)
2310 if (TREE_CODE (expr) == FUNCTION_DECL)
2311 expr = build_unary_op (ADDR_EXPR, expr, 0);
2313 switch (TREE_CODE (expr))
2315 case EQ_EXPR: case NE_EXPR: case UNEQ_EXPR: case LTGT_EXPR:
2316 case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR:
2317 case UNLE_EXPR: case UNGE_EXPR: case UNLT_EXPR: case UNGT_EXPR:
2318 case ORDERED_EXPR: case UNORDERED_EXPR:
2319 case TRUTH_ANDIF_EXPR:
2320 case TRUTH_ORIF_EXPR:
2321 case TRUTH_AND_EXPR:
2323 case TRUTH_XOR_EXPR:
2324 case TRUTH_NOT_EXPR:
2325 TREE_TYPE (expr) = truthvalue_type_node;
2332 return integer_zerop (expr) ? truthvalue_false_node : truthvalue_true_node;
2335 return real_zerop (expr) ? truthvalue_false_node : truthvalue_true_node;
2339 if (TREE_CODE (TREE_OPERAND (expr, 0)) == FUNCTION_DECL
2340 && ! DECL_WEAK (TREE_OPERAND (expr, 0)))
2342 /* Common Ada/Pascal programmer's mistake. We always warn
2343 about this since it is so bad. */
2344 warning ("the address of `%D', will always evaluate as `true'",
2345 TREE_OPERAND (expr, 0));
2346 return truthvalue_true_node;
2349 /* If we are taking the address of an external decl, it might be
2350 zero if it is weak, so we cannot optimize. */
2351 if (DECL_P (TREE_OPERAND (expr, 0))
2352 && DECL_EXTERNAL (TREE_OPERAND (expr, 0)))
2355 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 0)))
2356 return build2 (COMPOUND_EXPR, truthvalue_type_node,
2357 TREE_OPERAND (expr, 0), truthvalue_true_node);
2359 return truthvalue_true_node;
2363 return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))
2364 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
2365 lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0)),
2366 lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 1)),
2372 /* These don't change whether an object is nonzero or zero. */
2373 return lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0));
2377 /* These don't change whether an object is zero or nonzero, but
2378 we can't ignore them if their second arg has side-effects. */
2379 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)))
2380 return build2 (COMPOUND_EXPR, truthvalue_type_node,
2381 TREE_OPERAND (expr, 1),
2382 lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0)));
2384 return lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0));
2387 /* Distribute the conversion into the arms of a COND_EXPR. */
2388 return fold (build3 (COND_EXPR, truthvalue_type_node,
2389 TREE_OPERAND (expr, 0),
2390 lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 1)),
2391 lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 2))));
2394 /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE,
2395 since that affects how `default_conversion' will behave. */
2396 if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE
2397 || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE)
2399 /* Fall through.... */
2401 /* If this is widening the argument, we can ignore it. */
2402 if (TYPE_PRECISION (TREE_TYPE (expr))
2403 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0))))
2404 return lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0));
2408 /* Perhaps reduce (x - y) != 0 to (x != y). The expressions
2409 aren't guaranteed to the be same for modes that can represent
2410 infinity, since if x and y are both +infinity, or both
2411 -infinity, then x - y is not a number.
2413 Note that this transformation is safe when x or y is NaN.
2414 (x - y) is then NaN, and both (x - y) != 0 and x != y will
2416 if (HONOR_INFINITIES (TYPE_MODE (TREE_TYPE (TREE_OPERAND (expr, 0)))))
2418 /* Fall through.... */
2420 /* This and MINUS_EXPR can be changed into a comparison of the
2422 if (TREE_TYPE (TREE_OPERAND (expr, 0))
2423 == TREE_TYPE (TREE_OPERAND (expr, 1)))
2424 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
2425 TREE_OPERAND (expr, 1), 1);
2426 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
2427 fold (build1 (NOP_EXPR,
2428 TREE_TYPE (TREE_OPERAND (expr, 0)),
2429 TREE_OPERAND (expr, 1))), 1);
2432 if (integer_onep (TREE_OPERAND (expr, 1))
2433 && TREE_TYPE (expr) != truthvalue_type_node)
2434 /* Using convert here would cause infinite recursion. */
2435 return build1 (NOP_EXPR, truthvalue_type_node, expr);
2439 if (warn_parentheses && !TREE_NO_WARNING (expr))
2440 warning ("suggest parentheses around assignment used as truth value");
2447 if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE)
2449 tree t = save_expr (expr);
2450 return (build_binary_op
2451 ((TREE_SIDE_EFFECTS (expr)
2452 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
2453 lang_hooks.truthvalue_conversion (build_unary_op (REALPART_EXPR, t, 0)),
2454 lang_hooks.truthvalue_conversion (build_unary_op (IMAGPART_EXPR, t, 0)),
2458 return build_binary_op (NE_EXPR, expr, integer_zero_node, 1);
2461 static tree builtin_function_2 (const char *builtin_name, const char *name,
2462 tree builtin_type, tree type,
2463 enum built_in_function function_code,
2464 enum built_in_class cl, int library_name_p,
2468 /* Make a variant type in the proper way for C/C++, propagating qualifiers
2469 down to the element type of an array. */
2472 c_build_qualified_type (tree type, int type_quals)
2474 if (type == error_mark_node)
2477 if (TREE_CODE (type) == ARRAY_TYPE)
2478 return build_array_type (c_build_qualified_type (TREE_TYPE (type),
2480 TYPE_DOMAIN (type));
2482 /* A restrict-qualified pointer type must be a pointer to object or
2483 incomplete type. Note that the use of POINTER_TYPE_P also allows
2484 REFERENCE_TYPEs, which is appropriate for C++. */
2485 if ((type_quals & TYPE_QUAL_RESTRICT)
2486 && (!POINTER_TYPE_P (type)
2487 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))))
2489 error ("invalid use of `restrict'");
2490 type_quals &= ~TYPE_QUAL_RESTRICT;
2493 return build_qualified_type (type, type_quals);
2496 /* Apply the TYPE_QUALS to the new DECL. */
2499 c_apply_type_quals_to_decl (int type_quals, tree decl)
2501 tree type = TREE_TYPE (decl);
2503 if (type == error_mark_node)
2506 if (((type_quals & TYPE_QUAL_CONST)
2507 || (type && TREE_CODE (type) == REFERENCE_TYPE))
2508 /* An object declared 'const' is only readonly after it is
2509 initialized. We don't have any way of expressing this currently,
2510 so we need to be conservative and unset TREE_READONLY for types
2511 with constructors. Otherwise aliasing code will ignore stores in
2512 an inline constructor. */
2513 && !(type && TYPE_NEEDS_CONSTRUCTING (type)))
2514 TREE_READONLY (decl) = 1;
2515 if (type_quals & TYPE_QUAL_VOLATILE)
2517 TREE_SIDE_EFFECTS (decl) = 1;
2518 TREE_THIS_VOLATILE (decl) = 1;
2520 if (type_quals & TYPE_QUAL_RESTRICT)
2522 while (type && TREE_CODE (type) == ARRAY_TYPE)
2523 /* Allow 'restrict' on arrays of pointers.
2524 FIXME currently we just ignore it. */
2525 type = TREE_TYPE (type);
2527 || !POINTER_TYPE_P (type)
2528 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type)))
2529 error ("invalid use of `restrict'");
2530 else if (flag_strict_aliasing && type == TREE_TYPE (decl))
2531 /* Indicate we need to make a unique alias set for this pointer.
2532 We can't do it here because it might be pointing to an
2534 DECL_POINTER_ALIAS_SET (decl) = -2;
2538 /* Hash function for the problem of multiple type definitions in
2539 different files. This must hash all types that will compare
2540 equal via comptypes to the same value. In practice it hashes
2541 on some of the simple stuff and leaves the details to comptypes. */
2544 c_type_hash (const void *p)
2550 switch (TREE_CODE (t))
2552 /* For pointers, hash on pointee type plus some swizzling. */
2554 return c_type_hash (TREE_TYPE (t)) ^ 0x3003003;
2555 /* Hash on number of elements and total size. */
2558 t2 = TYPE_VALUES (t);
2562 t2 = TYPE_FIELDS (t);
2564 case QUAL_UNION_TYPE:
2566 t2 = TYPE_FIELDS (t);
2570 t2 = TYPE_FIELDS (t);
2575 for (; t2; t2 = TREE_CHAIN (t2))
2577 size = TREE_INT_CST_LOW (TYPE_SIZE (t));
2578 return ((size << 24) | (i << shift));
2581 /* Return the typed-based alias set for T, which may be an expression
2582 or a type. Return -1 if we don't do anything special. */
2585 c_common_get_alias_set (tree t)
2589 static htab_t type_hash_table;
2591 /* Permit type-punning when accessing a union, provided the access
2592 is directly through the union. For example, this code does not
2593 permit taking the address of a union member and then storing
2594 through it. Even the type-punning allowed here is a GCC
2595 extension, albeit a common and useful one; the C standard says
2596 that such accesses have implementation-defined behavior. */
2598 TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF;
2599 u = TREE_OPERAND (u, 0))
2600 if (TREE_CODE (u) == COMPONENT_REF
2601 && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE)
2604 /* That's all the expressions we handle specially. */
2608 /* The C standard guarantees that any object may be accessed via an
2609 lvalue that has character type. */
2610 if (t == char_type_node
2611 || t == signed_char_type_node
2612 || t == unsigned_char_type_node)
2615 /* If it has the may_alias attribute, it can alias anything. */
2616 if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (t)))
2619 /* The C standard specifically allows aliasing between signed and
2620 unsigned variants of the same type. We treat the signed
2621 variant as canonical. */
2622 if (TREE_CODE (t) == INTEGER_TYPE && TYPE_UNSIGNED (t))
2624 tree t1 = c_common_signed_type (t);
2626 /* t1 == t can happen for boolean nodes which are always unsigned. */
2628 return get_alias_set (t1);
2630 else if (POINTER_TYPE_P (t))
2634 /* Unfortunately, there is no canonical form of a pointer type.
2635 In particular, if we have `typedef int I', then `int *', and
2636 `I *' are different types. So, we have to pick a canonical
2637 representative. We do this below.
2639 Technically, this approach is actually more conservative that
2640 it needs to be. In particular, `const int *' and `int *'
2641 should be in different alias sets, according to the C and C++
2642 standard, since their types are not the same, and so,
2643 technically, an `int **' and `const int **' cannot point at
2646 But, the standard is wrong. In particular, this code is
2651 const int* const* cipp = ipp;
2653 And, it doesn't make sense for that to be legal unless you
2654 can dereference IPP and CIPP. So, we ignore cv-qualifiers on
2655 the pointed-to types. This issue has been reported to the
2657 t1 = build_type_no_quals (t);
2659 return get_alias_set (t1);
2662 /* Handle the case of multiple type nodes referring to "the same" type,
2663 which occurs with IMA. These share an alias set. FIXME: Currently only
2664 C90 is handled. (In C99 type compatibility is not transitive, which
2665 complicates things mightily. The alias set splay trees can theoretically
2666 represent this, but insertion is tricky when you consider all the
2667 different orders things might arrive in.) */
2669 if (c_language != clk_c || flag_isoc99)
2672 /* Save time if there's only one input file. */
2673 if (num_in_fnames == 1)
2676 /* Pointers need special handling if they point to any type that
2677 needs special handling (below). */
2678 if (TREE_CODE (t) == POINTER_TYPE)
2681 /* Find bottom type under any nested POINTERs. */
2682 for (t2 = TREE_TYPE (t);
2683 TREE_CODE (t2) == POINTER_TYPE;
2684 t2 = TREE_TYPE (t2))
2686 if (TREE_CODE (t2) != RECORD_TYPE
2687 && TREE_CODE (t2) != ENUMERAL_TYPE
2688 && TREE_CODE (t2) != QUAL_UNION_TYPE
2689 && TREE_CODE (t2) != UNION_TYPE)
2691 if (TYPE_SIZE (t2) == 0)
2694 /* These are the only cases that need special handling. */
2695 if (TREE_CODE (t) != RECORD_TYPE
2696 && TREE_CODE (t) != ENUMERAL_TYPE
2697 && TREE_CODE (t) != QUAL_UNION_TYPE
2698 && TREE_CODE (t) != UNION_TYPE
2699 && TREE_CODE (t) != POINTER_TYPE)
2702 if (TYPE_SIZE (t) == 0)
2705 /* Look up t in hash table. Only one of the compatible types within each
2706 alias set is recorded in the table. */
2707 if (!type_hash_table)
2708 type_hash_table = htab_create (1021, c_type_hash,
2709 (htab_eq) lang_hooks.types_compatible_p,
2711 slot = htab_find_slot (type_hash_table, t, INSERT);
2714 TYPE_ALIAS_SET (t) = TYPE_ALIAS_SET ((tree)*slot);
2715 return TYPE_ALIAS_SET ((tree)*slot);
2718 /* Our caller will assign and record (in t) a new alias set; all we need
2719 to do is remember t in the hash table. */
2725 /* Compute the value of 'sizeof (TYPE)' or '__alignof__ (TYPE)', where the
2726 second parameter indicates which OPERATOR is being applied. The COMPLAIN
2727 flag controls whether we should diagnose possibly ill-formed
2728 constructs or not. */
2730 c_sizeof_or_alignof_type (tree type, enum tree_code op, int complain)
2732 const char *op_name;
2734 enum tree_code type_code = TREE_CODE (type);
2736 my_friendly_assert (op == SIZEOF_EXPR || op == ALIGNOF_EXPR, 20020720);
2737 op_name = op == SIZEOF_EXPR ? "sizeof" : "__alignof__";
2739 if (type_code == FUNCTION_TYPE)
2741 if (op == SIZEOF_EXPR)
2743 if (complain && (pedantic || warn_pointer_arith))
2744 pedwarn ("invalid application of `sizeof' to a function type");
2745 value = size_one_node;
2748 value = size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT);
2750 else if (type_code == VOID_TYPE || type_code == ERROR_MARK)
2752 if (type_code == VOID_TYPE
2753 && complain && (pedantic || warn_pointer_arith))
2754 pedwarn ("invalid application of `%s' to a void type", op_name);
2755 value = size_one_node;
2757 else if (!COMPLETE_TYPE_P (type))
2760 error ("invalid application of `%s' to incomplete type `%T' ",
2762 value = size_zero_node;
2766 if (op == (enum tree_code) SIZEOF_EXPR)
2767 /* Convert in case a char is more than one unit. */
2768 value = size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type),
2769 size_int (TYPE_PRECISION (char_type_node)
2772 value = size_int (TYPE_ALIGN (type) / BITS_PER_UNIT);
2775 /* VALUE will have an integer type with TYPE_IS_SIZETYPE set.
2776 TYPE_IS_SIZETYPE means that certain things (like overflow) will
2777 never happen. However, this node should really have type
2778 `size_t', which is just a typedef for an ordinary integer type. */
2779 value = fold (build1 (NOP_EXPR, size_type_node, value));
2780 my_friendly_assert (!TYPE_IS_SIZETYPE (TREE_TYPE (value)), 20001021);
2785 /* Implement the __alignof keyword: Return the minimum required
2786 alignment of EXPR, measured in bytes. For VAR_DECL's and
2787 FIELD_DECL's return DECL_ALIGN (which can be set from an
2788 "aligned" __attribute__ specification). */
2791 c_alignof_expr (tree expr)
2795 if (TREE_CODE (expr) == VAR_DECL)
2796 t = size_int (DECL_ALIGN (expr) / BITS_PER_UNIT);
2798 else if (TREE_CODE (expr) == COMPONENT_REF
2799 && DECL_C_BIT_FIELD (TREE_OPERAND (expr, 1)))
2801 error ("`__alignof' applied to a bit-field");
2804 else if (TREE_CODE (expr) == COMPONENT_REF
2805 && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL)
2806 t = size_int (DECL_ALIGN (TREE_OPERAND (expr, 1)) / BITS_PER_UNIT);
2808 else if (TREE_CODE (expr) == INDIRECT_REF)
2810 tree t = TREE_OPERAND (expr, 0);
2812 int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
2814 while (TREE_CODE (t) == NOP_EXPR
2815 && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE)
2819 t = TREE_OPERAND (t, 0);
2820 thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
2821 if (thisalign > bestalign)
2822 best = t, bestalign = thisalign;
2824 return c_alignof (TREE_TYPE (TREE_TYPE (best)));
2827 return c_alignof (TREE_TYPE (expr));
2829 return fold (build1 (NOP_EXPR, size_type_node, t));
2832 /* Handle C and C++ default attributes. */
2834 enum built_in_attribute
2836 #define DEF_ATTR_NULL_TREE(ENUM) ENUM,
2837 #define DEF_ATTR_INT(ENUM, VALUE) ENUM,
2838 #define DEF_ATTR_IDENT(ENUM, STRING) ENUM,
2839 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM,
2840 #include "builtin-attrs.def"
2841 #undef DEF_ATTR_NULL_TREE
2843 #undef DEF_ATTR_IDENT
2844 #undef DEF_ATTR_TREE_LIST
2848 static GTY(()) tree built_in_attributes[(int) ATTR_LAST];
2850 static void c_init_attributes (void);
2852 /* Build tree nodes and builtin functions common to both C and C++ language
2856 c_common_nodes_and_builtins (void)
2860 #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME,
2861 #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME,
2862 #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME,
2863 #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME,
2864 #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
2865 #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
2866 #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME,
2867 #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME,
2868 #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME,
2869 #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
2870 #define DEF_POINTER_TYPE(NAME, TYPE) NAME,
2871 #include "builtin-types.def"
2872 #undef DEF_PRIMITIVE_TYPE
2873 #undef DEF_FUNCTION_TYPE_0
2874 #undef DEF_FUNCTION_TYPE_1
2875 #undef DEF_FUNCTION_TYPE_2
2876 #undef DEF_FUNCTION_TYPE_3
2877 #undef DEF_FUNCTION_TYPE_4
2878 #undef DEF_FUNCTION_TYPE_VAR_0
2879 #undef DEF_FUNCTION_TYPE_VAR_1
2880 #undef DEF_FUNCTION_TYPE_VAR_2
2881 #undef DEF_FUNCTION_TYPE_VAR_3
2882 #undef DEF_POINTER_TYPE
2886 typedef enum builtin_type builtin_type;
2888 tree builtin_types[(int) BT_LAST];
2889 int wchar_type_size;
2890 tree array_domain_type;
2891 tree va_list_ref_type_node;
2892 tree va_list_arg_type_node;
2894 /* Define `int' and `char' first so that dbx will output them first. */
2895 record_builtin_type (RID_INT, NULL, integer_type_node);
2896 record_builtin_type (RID_CHAR, "char", char_type_node);
2898 /* `signed' is the same as `int'. FIXME: the declarations of "signed",
2899 "unsigned long", "long long unsigned" and "unsigned short" were in C++
2900 but not C. Are the conditionals here needed? */
2901 if (c_dialect_cxx ())
2902 record_builtin_type (RID_SIGNED, NULL, integer_type_node);
2903 record_builtin_type (RID_LONG, "long int", long_integer_type_node);
2904 record_builtin_type (RID_UNSIGNED, "unsigned int", unsigned_type_node);
2905 record_builtin_type (RID_MAX, "long unsigned int",
2906 long_unsigned_type_node);
2907 if (c_dialect_cxx ())
2908 record_builtin_type (RID_MAX, "unsigned long", long_unsigned_type_node);
2909 record_builtin_type (RID_MAX, "long long int",
2910 long_long_integer_type_node);
2911 record_builtin_type (RID_MAX, "long long unsigned int",
2912 long_long_unsigned_type_node);
2913 if (c_dialect_cxx ())
2914 record_builtin_type (RID_MAX, "long long unsigned",
2915 long_long_unsigned_type_node);
2916 record_builtin_type (RID_SHORT, "short int", short_integer_type_node);
2917 record_builtin_type (RID_MAX, "short unsigned int",
2918 short_unsigned_type_node);
2919 if (c_dialect_cxx ())
2920 record_builtin_type (RID_MAX, "unsigned short",
2921 short_unsigned_type_node);
2923 /* Define both `signed char' and `unsigned char'. */
2924 record_builtin_type (RID_MAX, "signed char", signed_char_type_node);
2925 record_builtin_type (RID_MAX, "unsigned char", unsigned_char_type_node);
2927 /* These are types that c_common_type_for_size and
2928 c_common_type_for_mode use. */
2929 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2931 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2933 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2935 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2937 #if HOST_BITS_PER_WIDE_INT >= 64
2938 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL,
2939 get_identifier ("__int128_t"),
2942 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2943 unsigned_intQI_type_node));
2944 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2945 unsigned_intHI_type_node));
2946 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2947 unsigned_intSI_type_node));
2948 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2949 unsigned_intDI_type_node));
2950 #if HOST_BITS_PER_WIDE_INT >= 64
2951 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL,
2952 get_identifier ("__uint128_t"),
2953 unsigned_intTI_type_node));
2956 /* Create the widest literal types. */
2957 widest_integer_literal_type_node
2958 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
2959 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2960 widest_integer_literal_type_node));
2962 widest_unsigned_literal_type_node
2963 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
2964 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2965 widest_unsigned_literal_type_node));
2967 /* `unsigned long' is the standard type for sizeof.
2968 Note that stddef.h uses `unsigned long',
2969 and this must agree, even if long and int are the same size. */
2971 TREE_TYPE (identifier_global_value (get_identifier (SIZE_TYPE)));
2972 signed_size_type_node = c_common_signed_type (size_type_node);
2973 set_sizetype (size_type_node);
2976 TREE_TYPE (identifier_global_value (get_identifier (PID_TYPE)));
2978 build_common_tree_nodes_2 (flag_short_double);
2980 record_builtin_type (RID_FLOAT, NULL, float_type_node);
2981 record_builtin_type (RID_DOUBLE, NULL, double_type_node);
2982 record_builtin_type (RID_MAX, "long double", long_double_type_node);
2984 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL,
2985 get_identifier ("complex int"),
2986 complex_integer_type_node));
2987 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL,
2988 get_identifier ("complex float"),
2989 complex_float_type_node));
2990 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL,
2991 get_identifier ("complex double"),
2992 complex_double_type_node));
2993 lang_hooks.decls.pushdecl
2994 (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2995 complex_long_double_type_node));
2997 if (c_dialect_cxx ())
2998 /* For C++, make fileptr_type_node a distinct void * type until
2999 FILE type is defined. */
3000 fileptr_type_node = build_variant_type_copy (ptr_type_node);
3002 record_builtin_type (RID_VOID, NULL, void_type_node);
3004 /* This node must not be shared. */
3005 void_zero_node = make_node (INTEGER_CST);
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 return (TREE_CODE (exp) == COMPOUND_LITERAL_EXPR
3835 && TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (exp))
3840 /* Given a boolean expression ARG, return a tree representing an increment
3841 or decrement (as indicated by CODE) of ARG. The front end must check for
3842 invalid cases (e.g., decrement in C++). */
3844 boolean_increment (enum tree_code code, tree arg)
3847 tree true_res = boolean_true_node;
3849 arg = stabilize_reference (arg);
3852 case PREINCREMENT_EXPR:
3853 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res);
3855 case POSTINCREMENT_EXPR:
3856 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res);
3857 arg = save_expr (arg);
3858 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg);
3859 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val);
3861 case PREDECREMENT_EXPR:
3862 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg,
3863 invert_truthvalue (arg));
3865 case POSTDECREMENT_EXPR:
3866 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg,
3867 invert_truthvalue (arg));
3868 arg = save_expr (arg);
3869 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg);
3870 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val);
3875 TREE_SIDE_EFFECTS (val) = 1;
3879 /* Built-in macros for stddef.h, that require macros defined in this
3882 c_stddef_cpp_builtins(void)
3884 builtin_define_with_value ("__SIZE_TYPE__", SIZE_TYPE, 0);
3885 builtin_define_with_value ("__PTRDIFF_TYPE__", PTRDIFF_TYPE, 0);
3886 builtin_define_with_value ("__WCHAR_TYPE__", MODIFIED_WCHAR_TYPE, 0);
3887 builtin_define_with_value ("__WINT_TYPE__", WINT_TYPE, 0);
3888 builtin_define_with_value ("__INTMAX_TYPE__", INTMAX_TYPE, 0);
3889 builtin_define_with_value ("__UINTMAX_TYPE__", UINTMAX_TYPE, 0);
3893 c_init_attributes (void)
3895 /* Fill in the built_in_attributes array. */
3896 #define DEF_ATTR_NULL_TREE(ENUM) \
3897 built_in_attributes[(int) ENUM] = NULL_TREE;
3898 #define DEF_ATTR_INT(ENUM, VALUE) \
3899 built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE);
3900 #define DEF_ATTR_IDENT(ENUM, STRING) \
3901 built_in_attributes[(int) ENUM] = get_identifier (STRING);
3902 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \
3903 built_in_attributes[(int) ENUM] \
3904 = tree_cons (built_in_attributes[(int) PURPOSE], \
3905 built_in_attributes[(int) VALUE], \
3906 built_in_attributes[(int) CHAIN]);
3907 #include "builtin-attrs.def"
3908 #undef DEF_ATTR_NULL_TREE
3910 #undef DEF_ATTR_IDENT
3911 #undef DEF_ATTR_TREE_LIST
3914 /* Attribute handlers common to C front ends. */
3916 /* Handle a "packed" attribute; arguments as in
3917 struct attribute_spec.handler. */
3920 handle_packed_attribute (tree *node, tree name, tree ARG_UNUSED (args),
3921 int flags, bool *no_add_attrs)
3925 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
3926 *node = build_variant_type_copy (*node);
3927 TYPE_PACKED (*node) = 1;
3928 if (TYPE_MAIN_VARIANT (*node) == *node)
3930 /* If it is the main variant, then pack the other variants
3931 too. This happens in,
3934 struct Foo const *ptr; // creates a variant w/o packed flag
3935 } __ attribute__((packed)); // packs it now.
3939 for (probe = *node; probe; probe = TYPE_NEXT_VARIANT (probe))
3940 TYPE_PACKED (probe) = 1;
3944 else if (TREE_CODE (*node) == FIELD_DECL)
3945 DECL_PACKED (*node) = 1;
3946 /* We can't set DECL_PACKED for a VAR_DECL, because the bit is
3947 used for DECL_REGISTER. It wouldn't mean anything anyway.
3948 We can't set DECL_PACKED on the type of a TYPE_DECL, because
3949 that changes what the typedef is typing. */
3952 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
3953 *no_add_attrs = true;
3959 /* Handle a "nocommon" attribute; arguments as in
3960 struct attribute_spec.handler. */
3963 handle_nocommon_attribute (tree *node, tree name,
3964 tree ARG_UNUSED (args),
3965 int ARG_UNUSED (flags), bool *no_add_attrs)
3967 if (TREE_CODE (*node) == VAR_DECL)
3968 DECL_COMMON (*node) = 0;
3971 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
3972 *no_add_attrs = true;
3978 /* Handle a "common" attribute; arguments as in
3979 struct attribute_spec.handler. */
3982 handle_common_attribute (tree *node, tree name, tree ARG_UNUSED (args),
3983 int ARG_UNUSED (flags), bool *no_add_attrs)
3985 if (TREE_CODE (*node) == VAR_DECL)
3986 DECL_COMMON (*node) = 1;
3989 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
3990 *no_add_attrs = true;
3996 /* Handle a "noreturn" attribute; arguments as in
3997 struct attribute_spec.handler. */
4000 handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args),
4001 int ARG_UNUSED (flags), bool *no_add_attrs)
4003 tree type = TREE_TYPE (*node);
4005 /* See FIXME comment in c_common_attribute_table. */
4006 if (TREE_CODE (*node) == FUNCTION_DECL)
4007 TREE_THIS_VOLATILE (*node) = 1;
4008 else if (TREE_CODE (type) == POINTER_TYPE
4009 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
4011 = build_pointer_type
4012 (build_type_variant (TREE_TYPE (type),
4013 TYPE_READONLY (TREE_TYPE (type)), 1));
4016 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4017 *no_add_attrs = true;
4023 /* Handle a "noinline" attribute; arguments as in
4024 struct attribute_spec.handler. */
4027 handle_noinline_attribute (tree *node, tree name,
4028 tree ARG_UNUSED (args),
4029 int ARG_UNUSED (flags), bool *no_add_attrs)
4031 if (TREE_CODE (*node) == FUNCTION_DECL)
4032 DECL_UNINLINABLE (*node) = 1;
4035 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4036 *no_add_attrs = true;
4042 /* Handle a "always_inline" attribute; arguments as in
4043 struct attribute_spec.handler. */
4046 handle_always_inline_attribute (tree *node, tree name,
4047 tree ARG_UNUSED (args),
4048 int ARG_UNUSED (flags),
4051 if (TREE_CODE (*node) == FUNCTION_DECL)
4053 /* Do nothing else, just set the attribute. We'll get at
4054 it later with lookup_attribute. */
4058 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4059 *no_add_attrs = true;
4065 /* Handle a "used" attribute; arguments as in
4066 struct attribute_spec.handler. */
4069 handle_used_attribute (tree *pnode, tree name, tree ARG_UNUSED (args),
4070 int ARG_UNUSED (flags), bool *no_add_attrs)
4074 if (TREE_CODE (node) == FUNCTION_DECL
4075 || (TREE_CODE (node) == VAR_DECL && TREE_STATIC (node)))
4077 TREE_USED (node) = 1;
4078 DECL_PRESERVE_P (node) = 1;
4082 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4083 *no_add_attrs = true;
4089 /* Handle a "unused" attribute; arguments as in
4090 struct attribute_spec.handler. */
4093 handle_unused_attribute (tree *node, tree name, tree ARG_UNUSED (args),
4094 int flags, bool *no_add_attrs)
4100 if (TREE_CODE (decl) == PARM_DECL
4101 || TREE_CODE (decl) == VAR_DECL
4102 || TREE_CODE (decl) == FUNCTION_DECL
4103 || TREE_CODE (decl) == LABEL_DECL
4104 || TREE_CODE (decl) == TYPE_DECL)
4105 TREE_USED (decl) = 1;
4108 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4109 *no_add_attrs = true;
4114 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
4115 *node = build_variant_type_copy (*node);
4116 TREE_USED (*node) = 1;
4122 /* Handle a "const" attribute; arguments as in
4123 struct attribute_spec.handler. */
4126 handle_const_attribute (tree *node, tree name, tree ARG_UNUSED (args),
4127 int ARG_UNUSED (flags), bool *no_add_attrs)
4129 tree type = TREE_TYPE (*node);
4131 /* See FIXME comment on noreturn in c_common_attribute_table. */
4132 if (TREE_CODE (*node) == FUNCTION_DECL)
4133 TREE_READONLY (*node) = 1;
4134 else if (TREE_CODE (type) == POINTER_TYPE
4135 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
4137 = build_pointer_type
4138 (build_type_variant (TREE_TYPE (type), 1,
4139 TREE_THIS_VOLATILE (TREE_TYPE (type))));
4142 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4143 *no_add_attrs = true;
4149 /* Handle a "transparent_union" attribute; arguments as in
4150 struct attribute_spec.handler. */
4153 handle_transparent_union_attribute (tree *node, tree name,
4154 tree ARG_UNUSED (args), int flags,
4157 tree decl = NULL_TREE;
4164 type = &TREE_TYPE (decl);
4165 is_type = TREE_CODE (*node) == TYPE_DECL;
4167 else if (TYPE_P (*node))
4168 type = node, is_type = 1;
4171 && TREE_CODE (*type) == UNION_TYPE
4173 || (TYPE_FIELDS (*type) != 0
4174 && TYPE_MODE (*type) == DECL_MODE (TYPE_FIELDS (*type)))))
4176 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
4177 *type = build_variant_type_copy (*type);
4178 TYPE_TRANSPARENT_UNION (*type) = 1;
4180 else if (decl != 0 && TREE_CODE (decl) == PARM_DECL
4181 && TREE_CODE (*type) == UNION_TYPE
4182 && TYPE_MODE (*type) == DECL_MODE (TYPE_FIELDS (*type)))
4183 DECL_TRANSPARENT_UNION (decl) = 1;
4186 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4187 *no_add_attrs = true;
4193 /* Handle a "constructor" attribute; arguments as in
4194 struct attribute_spec.handler. */
4197 handle_constructor_attribute (tree *node, tree name,
4198 tree ARG_UNUSED (args),
4199 int ARG_UNUSED (flags),
4203 tree type = TREE_TYPE (decl);
4205 if (TREE_CODE (decl) == FUNCTION_DECL
4206 && TREE_CODE (type) == FUNCTION_TYPE
4207 && decl_function_context (decl) == 0)
4209 DECL_STATIC_CONSTRUCTOR (decl) = 1;
4210 TREE_USED (decl) = 1;
4214 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4215 *no_add_attrs = true;
4221 /* Handle a "destructor" attribute; arguments as in
4222 struct attribute_spec.handler. */
4225 handle_destructor_attribute (tree *node, tree name,
4226 tree ARG_UNUSED (args),
4227 int ARG_UNUSED (flags),
4231 tree type = TREE_TYPE (decl);
4233 if (TREE_CODE (decl) == FUNCTION_DECL
4234 && TREE_CODE (type) == FUNCTION_TYPE
4235 && decl_function_context (decl) == 0)
4237 DECL_STATIC_DESTRUCTOR (decl) = 1;
4238 TREE_USED (decl) = 1;
4242 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4243 *no_add_attrs = true;
4249 /* Handle a "mode" attribute; arguments as in
4250 struct attribute_spec.handler. */
4253 handle_mode_attribute (tree *node, tree name, tree args,
4254 int ARG_UNUSED (flags), bool *no_add_attrs)
4258 *no_add_attrs = true;
4260 if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE)
4261 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4265 const char *p = IDENTIFIER_POINTER (TREE_VALUE (args));
4266 int len = strlen (p);
4267 enum machine_mode mode = VOIDmode;
4271 if (len > 4 && p[0] == '_' && p[1] == '_'
4272 && p[len - 1] == '_' && p[len - 2] == '_')
4274 char *newp = (char *) alloca (len - 1);
4276 strcpy (newp, &p[2]);
4277 newp[len - 4] = '\0';
4281 /* Change this type to have a type with the specified mode.
4282 First check for the special modes. */
4283 if (! strcmp (p, "byte"))
4285 else if (!strcmp (p, "word"))
4287 else if (! strcmp (p, "pointer"))
4290 for (j = 0; j < NUM_MACHINE_MODES; j++)
4291 if (!strcmp (p, GET_MODE_NAME (j)))
4292 mode = (enum machine_mode) j;
4294 if (mode == VOIDmode)
4296 error ("unknown machine mode %<%s%>", p);
4301 switch (GET_MODE_CLASS (mode))
4304 case MODE_PARTIAL_INT:
4306 valid_mode = targetm.scalar_mode_supported_p (mode);
4309 case MODE_COMPLEX_INT:
4310 case MODE_COMPLEX_FLOAT:
4311 valid_mode = targetm.scalar_mode_supported_p (GET_MODE_INNER (mode));
4314 case MODE_VECTOR_INT:
4315 case MODE_VECTOR_FLOAT:
4316 warning ("specifying vector types with __attribute__ ((mode)) "
4318 warning ("use __attribute__ ((vector_size)) instead");
4319 valid_mode = vector_mode_valid_p (mode);
4327 error ("unable to emulate %<%s%>", p);
4331 if (POINTER_TYPE_P (type))
4333 tree (*fn)(tree, enum machine_mode, bool);
4335 if (!targetm.valid_pointer_mode (mode))
4337 error ("invalid pointer mode %<%s%>", p);
4341 if (TREE_CODE (type) == POINTER_TYPE)
4342 fn = build_pointer_type_for_mode;
4344 fn = build_reference_type_for_mode;
4345 typefm = fn (TREE_TYPE (type), mode, false);
4348 typefm = lang_hooks.types.type_for_mode (mode, TYPE_UNSIGNED (type));
4349 if (typefm == NULL_TREE)
4351 error ("no data type for mode %<%s%>", p);
4356 /* No need to layout the type here. The caller should do this. */
4362 /* Handle a "section" attribute; arguments as in
4363 struct attribute_spec.handler. */
4366 handle_section_attribute (tree *node, tree ARG_UNUSED (name), tree args,
4367 int ARG_UNUSED (flags), bool *no_add_attrs)
4371 if (targetm.have_named_sections)
4373 user_defined_section_attribute = true;
4375 if ((TREE_CODE (decl) == FUNCTION_DECL
4376 || TREE_CODE (decl) == VAR_DECL)
4377 && TREE_CODE (TREE_VALUE (args)) == STRING_CST)
4379 if (TREE_CODE (decl) == VAR_DECL
4380 && current_function_decl != NULL_TREE
4381 && ! TREE_STATIC (decl))
4383 error ("%Jsection attribute cannot be specified for "
4384 "local variables", decl);
4385 *no_add_attrs = true;
4388 /* The decl may have already been given a section attribute
4389 from a previous declaration. Ensure they match. */
4390 else if (DECL_SECTION_NAME (decl) != NULL_TREE
4391 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
4392 TREE_STRING_POINTER (TREE_VALUE (args))) != 0)
4394 error ("%Jsection of '%D' conflicts with previous declaration",
4396 *no_add_attrs = true;
4399 DECL_SECTION_NAME (decl) = TREE_VALUE (args);
4403 error ("%Jsection attribute not allowed for '%D'", *node, *node);
4404 *no_add_attrs = true;
4409 error ("%Jsection attributes are not supported for this target", *node);
4410 *no_add_attrs = true;
4416 /* Handle a "aligned" attribute; arguments as in
4417 struct attribute_spec.handler. */
4420 handle_aligned_attribute (tree *node, tree ARG_UNUSED (name), tree args,
4421 int flags, bool *no_add_attrs)
4423 tree decl = NULL_TREE;
4426 tree align_expr = (args ? TREE_VALUE (args)
4427 : size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
4433 type = &TREE_TYPE (decl);
4434 is_type = TREE_CODE (*node) == TYPE_DECL;
4436 else if (TYPE_P (*node))
4437 type = node, is_type = 1;
4439 /* Strip any NOPs of any kind. */
4440 while (TREE_CODE (align_expr) == NOP_EXPR
4441 || TREE_CODE (align_expr) == CONVERT_EXPR
4442 || TREE_CODE (align_expr) == NON_LVALUE_EXPR)
4443 align_expr = TREE_OPERAND (align_expr, 0);
4445 if (TREE_CODE (align_expr) != INTEGER_CST)
4447 error ("requested alignment is not a constant");
4448 *no_add_attrs = true;
4450 else if ((i = tree_log2 (align_expr)) == -1)
4452 error ("requested alignment is not a power of 2");
4453 *no_add_attrs = true;
4455 else if (i > HOST_BITS_PER_INT - 2)
4457 error ("requested alignment is too large");
4458 *no_add_attrs = true;
4462 /* If we have a TYPE_DECL, then copy the type, so that we
4463 don't accidentally modify a builtin type. See pushdecl. */
4464 if (decl && TREE_TYPE (decl) != error_mark_node
4465 && DECL_ORIGINAL_TYPE (decl) == NULL_TREE)
4467 tree tt = TREE_TYPE (decl);
4468 *type = build_variant_type_copy (*type);
4469 DECL_ORIGINAL_TYPE (decl) = tt;
4470 TYPE_NAME (*type) = decl;
4471 TREE_USED (*type) = TREE_USED (decl);
4472 TREE_TYPE (decl) = *type;
4474 else if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
4475 *type = build_variant_type_copy (*type);
4477 TYPE_ALIGN (*type) = (1 << i) * BITS_PER_UNIT;
4478 TYPE_USER_ALIGN (*type) = 1;
4480 else if (TREE_CODE (decl) != VAR_DECL
4481 && TREE_CODE (decl) != FIELD_DECL)
4483 error ("%Jalignment may not be specified for '%D'", decl, decl);
4484 *no_add_attrs = true;
4488 DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT;
4489 DECL_USER_ALIGN (decl) = 1;
4495 /* Handle a "weak" attribute; arguments as in
4496 struct attribute_spec.handler. */
4499 handle_weak_attribute (tree *node, tree ARG_UNUSED (name),
4500 tree ARG_UNUSED (args),
4501 int ARG_UNUSED (flags),
4502 bool * ARG_UNUSED (no_add_attrs))
4504 declare_weak (*node);
4509 /* Handle an "alias" attribute; arguments as in
4510 struct attribute_spec.handler. */
4513 handle_alias_attribute (tree *node, tree name, tree args,
4514 int ARG_UNUSED (flags), bool *no_add_attrs)
4518 if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
4519 || (TREE_CODE (decl) != FUNCTION_DECL && ! DECL_EXTERNAL (decl)))
4521 error ("%J'%D' defined both normally and as an alias", decl, decl);
4522 *no_add_attrs = true;
4525 /* Note that the very first time we process a nested declaration,
4526 decl_function_context will not be set. Indeed, *would* never
4527 be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that
4528 we do below. After such frobbery, pushdecl would set the context.
4529 In any case, this is never what we want. */
4530 else if (decl_function_context (decl) == 0 && current_function_decl == NULL)
4534 id = TREE_VALUE (args);
4535 if (TREE_CODE (id) != STRING_CST)
4537 error ("alias arg not a string");
4538 *no_add_attrs = true;
4541 id = get_identifier (TREE_STRING_POINTER (id));
4542 /* This counts as a use of the object pointed to. */
4545 if (TREE_CODE (decl) == FUNCTION_DECL)
4546 DECL_INITIAL (decl) = error_mark_node;
4549 DECL_EXTERNAL (decl) = 0;
4550 TREE_STATIC (decl) = 1;
4555 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4556 *no_add_attrs = true;
4562 /* Handle an "visibility" attribute; arguments as in
4563 struct attribute_spec.handler. */
4566 handle_visibility_attribute (tree *node, tree name, tree args,
4567 int ARG_UNUSED (flags),
4571 tree id = TREE_VALUE (args);
4573 *no_add_attrs = true;
4577 if (TREE_CODE (*node) != RECORD_TYPE && TREE_CODE (*node) != UNION_TYPE)
4579 warning ("`%s' attribute ignored on non-class types",
4580 IDENTIFIER_POINTER (name));
4584 else if (decl_function_context (decl) != 0 || ! TREE_PUBLIC (decl))
4586 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4590 if (TREE_CODE (id) != STRING_CST)
4592 error ("visibility arg not a string");
4596 /* If this is a type, set the visibility on the type decl. */
4599 decl = TYPE_NAME (decl);
4604 if (strcmp (TREE_STRING_POINTER (id), "default") == 0)
4605 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
4606 else if (strcmp (TREE_STRING_POINTER (id), "internal") == 0)
4607 DECL_VISIBILITY (decl) = VISIBILITY_INTERNAL;
4608 else if (strcmp (TREE_STRING_POINTER (id), "hidden") == 0)
4609 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
4610 else if (strcmp (TREE_STRING_POINTER (id), "protected") == 0)
4611 DECL_VISIBILITY (decl) = VISIBILITY_PROTECTED;
4613 error ("visibility arg must be one of \"default\", \"hidden\", \"protected\" or \"internal\"");
4614 DECL_VISIBILITY_SPECIFIED (decl) = 1;
4616 /* For decls only, go ahead and attach the attribute to the node as well.
4617 This is needed so we can determine whether we have VISIBILITY_DEFAULT
4618 because the visibility was not specified, or because it was explicitly
4619 overridden from the class visibility. */
4621 *no_add_attrs = false;
4626 /* Determine the ELF symbol visibility for DECL, which is either a
4627 variable or a function. It is an error to use this function if a
4628 definition of DECL is not available in this translation unit.
4629 Returns true if the final visibility has been determined by this
4630 function; false if the caller is free to make additional
4634 c_determine_visibility (tree decl)
4636 my_friendly_assert (TREE_CODE (decl) == VAR_DECL
4637 || TREE_CODE (decl) == FUNCTION_DECL,
4640 /* If the user explicitly specified the visibility with an
4641 attribute, honor that. DECL_VISIBILITY will have been set during
4642 the processing of the attribute. We check for an explicit
4643 attribute, rather than just checking DECL_VISIBILITY_SPECIFIED,
4644 to distinguish the use of an attribute from the use of a "#pragma
4645 GCC visibility push(...)"; in the latter case we still want other
4646 considerations to be able to overrule the #pragma. */
4647 if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl)))
4650 /* Anything that is exported must have default visibility. */
4651 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
4652 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
4654 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
4655 DECL_VISIBILITY_SPECIFIED (decl) = 1;
4662 /* Handle an "tls_model" attribute; arguments as in
4663 struct attribute_spec.handler. */
4666 handle_tls_model_attribute (tree *node, tree name, tree args,
4667 int ARG_UNUSED (flags), bool *no_add_attrs)
4671 if (! DECL_THREAD_LOCAL (decl))
4673 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4674 *no_add_attrs = true;
4680 id = TREE_VALUE (args);
4681 if (TREE_CODE (id) != STRING_CST)
4683 error ("tls_model arg not a string");
4684 *no_add_attrs = true;
4687 if (strcmp (TREE_STRING_POINTER (id), "local-exec")
4688 && strcmp (TREE_STRING_POINTER (id), "initial-exec")
4689 && strcmp (TREE_STRING_POINTER (id), "local-dynamic")
4690 && strcmp (TREE_STRING_POINTER (id), "global-dynamic"))
4692 error ("tls_model arg must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\"");
4693 *no_add_attrs = true;
4701 /* Handle a "no_instrument_function" attribute; arguments as in
4702 struct attribute_spec.handler. */
4705 handle_no_instrument_function_attribute (tree *node, tree name,
4706 tree ARG_UNUSED (args),
4707 int ARG_UNUSED (flags),
4712 if (TREE_CODE (decl) != FUNCTION_DECL)
4714 error ("%J'%E' attribute applies only to functions", decl, name);
4715 *no_add_attrs = true;
4717 else if (DECL_INITIAL (decl))
4719 error ("%Jcan't set '%E' attribute after definition", decl, name);
4720 *no_add_attrs = true;
4723 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1;
4728 /* Handle a "malloc" attribute; arguments as in
4729 struct attribute_spec.handler. */
4732 handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args),
4733 int ARG_UNUSED (flags), bool *no_add_attrs)
4735 if (TREE_CODE (*node) == FUNCTION_DECL)
4736 DECL_IS_MALLOC (*node) = 1;
4737 /* ??? TODO: Support types. */
4740 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4741 *no_add_attrs = true;
4747 /* Handle a "no_limit_stack" attribute; arguments as in
4748 struct attribute_spec.handler. */
4751 handle_no_limit_stack_attribute (tree *node, tree name,
4752 tree ARG_UNUSED (args),
4753 int ARG_UNUSED (flags),
4758 if (TREE_CODE (decl) != FUNCTION_DECL)
4760 error ("%J'%E' attribute applies only to functions", decl, name);
4761 *no_add_attrs = true;
4763 else if (DECL_INITIAL (decl))
4765 error ("%Jcan't set '%E' attribute after definition", decl, name);
4766 *no_add_attrs = true;
4769 DECL_NO_LIMIT_STACK (decl) = 1;
4774 /* Handle a "pure" attribute; arguments as in
4775 struct attribute_spec.handler. */
4778 handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args),
4779 int ARG_UNUSED (flags), bool *no_add_attrs)
4781 if (TREE_CODE (*node) == FUNCTION_DECL)
4782 DECL_IS_PURE (*node) = 1;
4783 /* ??? TODO: Support types. */
4786 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4787 *no_add_attrs = true;
4793 /* Handle a "deprecated" attribute; arguments as in
4794 struct attribute_spec.handler. */
4797 handle_deprecated_attribute (tree *node, tree name,
4798 tree ARG_UNUSED (args), int flags,
4801 tree type = NULL_TREE;
4803 const char *what = NULL;
4808 type = TREE_TYPE (decl);
4810 if (TREE_CODE (decl) == TYPE_DECL
4811 || TREE_CODE (decl) == PARM_DECL
4812 || TREE_CODE (decl) == VAR_DECL
4813 || TREE_CODE (decl) == FUNCTION_DECL
4814 || TREE_CODE (decl) == FIELD_DECL)
4815 TREE_DEPRECATED (decl) = 1;
4819 else if (TYPE_P (*node))
4821 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
4822 *node = build_variant_type_copy (*node);
4823 TREE_DEPRECATED (*node) = 1;
4831 *no_add_attrs = true;
4832 if (type && TYPE_NAME (type))
4834 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
4835 what = IDENTIFIER_POINTER (TYPE_NAME (*node));
4836 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
4837 && DECL_NAME (TYPE_NAME (type)))
4838 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
4841 warning ("`%s' attribute ignored for `%s'",
4842 IDENTIFIER_POINTER (name), what);
4844 warning ("`%s' attribute ignored",
4845 IDENTIFIER_POINTER (name));
4851 /* Handle a "vector_size" attribute; arguments as in
4852 struct attribute_spec.handler. */
4855 handle_vector_size_attribute (tree *node, tree name, tree args,
4856 int ARG_UNUSED (flags),
4859 unsigned HOST_WIDE_INT vecsize, nunits;
4860 enum machine_mode orig_mode;
4861 tree type = *node, new_type, size;
4863 *no_add_attrs = true;
4865 /* Stripping NON_LVALUE_EXPR allows declarations such as
4866 typedef short v4si __attribute__((vector_size (4 * sizeof(short)))). */
4867 size = TREE_VALUE (args);
4868 if (TREE_CODE (size) == NON_LVALUE_EXPR)
4869 size = TREE_OPERAND (size, 0);
4871 if (! host_integerp (size, 1))
4873 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
4877 /* Get the vector size (in bytes). */
4878 vecsize = tree_low_cst (size, 1);
4880 /* We need to provide for vector pointers, vector arrays, and
4881 functions returning vectors. For example:
4883 __attribute__((vector_size(16))) short *foo;
4885 In this case, the mode is SI, but the type being modified is
4886 HI, so we need to look further. */
4888 while (POINTER_TYPE_P (type)
4889 || TREE_CODE (type) == FUNCTION_TYPE
4890 || TREE_CODE (type) == METHOD_TYPE
4891 || TREE_CODE (type) == ARRAY_TYPE)
4892 type = TREE_TYPE (type);
4894 /* Get the mode of the type being modified. */
4895 orig_mode = TYPE_MODE (type);
4897 if (TREE_CODE (type) == RECORD_TYPE
4898 || (GET_MODE_CLASS (orig_mode) != MODE_FLOAT
4899 && GET_MODE_CLASS (orig_mode) != MODE_INT)
4900 || ! host_integerp (TYPE_SIZE_UNIT (type), 1))
4902 error ("invalid vector type for attribute `%s'",
4903 IDENTIFIER_POINTER (name));
4907 /* Calculate how many units fit in the vector. */
4908 nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1);
4909 if (nunits & (nunits - 1))
4911 error ("number of components of the vector not a power of two");
4915 new_type = build_vector_type (type, nunits);
4917 /* Build back pointers if needed. */
4918 *node = reconstruct_complex_type (*node, new_type);
4923 /* Handle the "nonnull" attribute. */
4925 handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name),
4926 tree args, int ARG_UNUSED (flags),
4930 unsigned HOST_WIDE_INT attr_arg_num;
4932 /* If no arguments are specified, all pointer arguments should be
4933 non-null. Verify a full prototype is given so that the arguments
4934 will have the correct types when we actually check them later. */
4937 if (! TYPE_ARG_TYPES (type))
4939 error ("nonnull attribute without arguments on a non-prototype");
4940 *no_add_attrs = true;
4945 /* Argument list specified. Verify that each argument number references
4946 a pointer argument. */
4947 for (attr_arg_num = 1; args; args = TREE_CHAIN (args))
4950 unsigned HOST_WIDE_INT arg_num = 0, ck_num;
4952 if (! get_nonnull_operand (TREE_VALUE (args), &arg_num))
4954 error ("nonnull argument has invalid operand number (arg %lu)",
4955 (unsigned long) attr_arg_num);
4956 *no_add_attrs = true;
4960 argument = TYPE_ARG_TYPES (type);
4963 for (ck_num = 1; ; ck_num++)
4965 if (! argument || ck_num == arg_num)
4967 argument = TREE_CHAIN (argument);
4971 || TREE_CODE (TREE_VALUE (argument)) == VOID_TYPE)
4973 error ("nonnull argument with out-of-range operand number (arg %lu, operand %lu)",
4974 (unsigned long) attr_arg_num, (unsigned long) arg_num);
4975 *no_add_attrs = true;
4979 if (TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE)
4981 error ("nonnull argument references non-pointer operand (arg %lu, operand %lu)",
4982 (unsigned long) attr_arg_num, (unsigned long) arg_num);
4983 *no_add_attrs = true;
4992 /* Check the argument list of a function call for null in argument slots
4993 that are marked as requiring a non-null pointer argument. */
4996 check_function_nonnull (tree attrs, tree params)
4998 tree a, args, param;
5001 for (a = attrs; a; a = TREE_CHAIN (a))
5003 if (is_attribute_p ("nonnull", TREE_PURPOSE (a)))
5005 args = TREE_VALUE (a);
5007 /* Walk the argument list. If we encounter an argument number we
5008 should check for non-null, do it. If the attribute has no args,
5009 then every pointer argument is checked (in which case the check
5010 for pointer type is done in check_nonnull_arg). */
5011 for (param = params, param_num = 1; ;
5012 param_num++, param = TREE_CHAIN (param))
5016 if (! args || nonnull_check_p (args, param_num))
5017 check_function_arguments_recurse (check_nonnull_arg, NULL,
5025 /* Helper for check_function_nonnull; given a list of operands which
5026 must be non-null in ARGS, determine if operand PARAM_NUM should be
5030 nonnull_check_p (tree args, unsigned HOST_WIDE_INT param_num)
5032 unsigned HOST_WIDE_INT arg_num = 0;
5034 for (; args; args = TREE_CHAIN (args))
5036 if (! get_nonnull_operand (TREE_VALUE (args), &arg_num))
5039 if (arg_num == param_num)
5045 /* Check that the function argument PARAM (which is operand number
5046 PARAM_NUM) is non-null. This is called by check_function_nonnull
5047 via check_function_arguments_recurse. */
5050 check_nonnull_arg (void * ARG_UNUSED (ctx), tree param,
5051 unsigned HOST_WIDE_INT param_num)
5053 /* Just skip checking the argument if it's not a pointer. This can
5054 happen if the "nonnull" attribute was given without an operand
5055 list (which means to check every pointer argument). */
5057 if (TREE_CODE (TREE_TYPE (param)) != POINTER_TYPE)
5060 if (integer_zerop (param))
5061 warning ("null argument where non-null required (arg %lu)",
5062 (unsigned long) param_num);
5065 /* Helper for nonnull attribute handling; fetch the operand number
5066 from the attribute argument list. */
5069 get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp)
5071 /* Strip any conversions from the arg number and verify they
5073 while (TREE_CODE (arg_num_expr) == NOP_EXPR
5074 || TREE_CODE (arg_num_expr) == CONVERT_EXPR
5075 || TREE_CODE (arg_num_expr) == NON_LVALUE_EXPR)
5076 arg_num_expr = TREE_OPERAND (arg_num_expr, 0);
5078 if (TREE_CODE (arg_num_expr) != INTEGER_CST
5079 || TREE_INT_CST_HIGH (arg_num_expr) != 0)
5082 *valp = TREE_INT_CST_LOW (arg_num_expr);
5086 /* Handle a "nothrow" attribute; arguments as in
5087 struct attribute_spec.handler. */
5090 handle_nothrow_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5091 int ARG_UNUSED (flags), bool *no_add_attrs)
5093 if (TREE_CODE (*node) == FUNCTION_DECL)
5094 TREE_NOTHROW (*node) = 1;
5095 /* ??? TODO: Support types. */
5098 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
5099 *no_add_attrs = true;
5105 /* Handle a "cleanup" attribute; arguments as in
5106 struct attribute_spec.handler. */
5109 handle_cleanup_attribute (tree *node, tree name, tree args,
5110 int ARG_UNUSED (flags), bool *no_add_attrs)
5113 tree cleanup_id, cleanup_decl;
5115 /* ??? Could perhaps support cleanups on TREE_STATIC, much like we do
5116 for global destructors in C++. This requires infrastructure that
5117 we don't have generically at the moment. It's also not a feature
5118 we'd be missing too much, since we do have attribute constructor. */
5119 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl))
5121 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
5122 *no_add_attrs = true;
5126 /* Verify that the argument is a function in scope. */
5127 /* ??? We could support pointers to functions here as well, if
5128 that was considered desirable. */
5129 cleanup_id = TREE_VALUE (args);
5130 if (TREE_CODE (cleanup_id) != IDENTIFIER_NODE)
5132 error ("cleanup arg not an identifier");
5133 *no_add_attrs = true;
5136 cleanup_decl = lookup_name (cleanup_id);
5137 if (!cleanup_decl || TREE_CODE (cleanup_decl) != FUNCTION_DECL)
5139 error ("cleanup arg not a function");
5140 *no_add_attrs = true;
5144 /* That the function has proper type is checked with the
5145 eventual call to build_function_call. */
5150 /* Handle a "warn_unused_result" attribute. No special handling. */
5153 handle_warn_unused_result_attribute (tree *node, tree name,
5154 tree ARG_UNUSED (args),
5155 int ARG_UNUSED (flags), bool *no_add_attrs)
5157 /* Ignore the attribute for functions not returning any value. */
5158 if (VOID_TYPE_P (TREE_TYPE (*node)))
5160 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
5161 *no_add_attrs = true;
5167 /* Check for valid arguments being passed to a function. */
5169 check_function_arguments (tree attrs, tree params)
5171 /* Check for null being passed in a pointer argument that must be
5172 non-null. We also need to do this if format checking is enabled. */
5175 check_function_nonnull (attrs, params);
5177 /* Check for errors in format strings. */
5180 check_function_format (attrs, params);
5183 /* Generic argument checking recursion routine. PARAM is the argument to
5184 be checked. PARAM_NUM is the number of the argument. CALLBACK is invoked
5185 once the argument is resolved. CTX is context for the callback. */
5187 check_function_arguments_recurse (void (*callback)
5188 (void *, tree, unsigned HOST_WIDE_INT),
5189 void *ctx, tree param,
5190 unsigned HOST_WIDE_INT param_num)
5192 if (TREE_CODE (param) == NOP_EXPR)
5194 /* Strip coercion. */
5195 check_function_arguments_recurse (callback, ctx,
5196 TREE_OPERAND (param, 0), param_num);
5200 if (TREE_CODE (param) == CALL_EXPR)
5202 tree type = TREE_TYPE (TREE_TYPE (TREE_OPERAND (param, 0)));
5204 bool found_format_arg = false;
5206 /* See if this is a call to a known internationalization function
5207 that modifies a format arg. Such a function may have multiple
5208 format_arg attributes (for example, ngettext). */
5210 for (attrs = TYPE_ATTRIBUTES (type);
5212 attrs = TREE_CHAIN (attrs))
5213 if (is_attribute_p ("format_arg", TREE_PURPOSE (attrs)))
5216 tree format_num_expr;
5220 /* Extract the argument number, which was previously checked
5222 format_num_expr = TREE_VALUE (TREE_VALUE (attrs));
5223 while (TREE_CODE (format_num_expr) == NOP_EXPR
5224 || TREE_CODE (format_num_expr) == CONVERT_EXPR
5225 || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
5226 format_num_expr = TREE_OPERAND (format_num_expr, 0);
5228 if (TREE_CODE (format_num_expr) != INTEGER_CST
5229 || TREE_INT_CST_HIGH (format_num_expr) != 0)
5232 format_num = TREE_INT_CST_LOW (format_num_expr);
5234 for (inner_args = TREE_OPERAND (param, 1), i = 1;
5236 inner_args = TREE_CHAIN (inner_args), i++)
5237 if (i == format_num)
5239 check_function_arguments_recurse (callback, ctx,
5240 TREE_VALUE (inner_args),
5242 found_format_arg = true;
5247 /* If we found a format_arg attribute and did a recursive check,
5248 we are done with checking this argument. Otherwise, we continue
5249 and this will be considered a non-literal. */
5250 if (found_format_arg)
5254 if (TREE_CODE (param) == COND_EXPR)
5256 /* Check both halves of the conditional expression. */
5257 check_function_arguments_recurse (callback, ctx,
5258 TREE_OPERAND (param, 1), param_num);
5259 check_function_arguments_recurse (callback, ctx,
5260 TREE_OPERAND (param, 2), param_num);
5264 (*callback) (ctx, param, param_num);
5267 /* Function to help qsort sort FIELD_DECLs by name order. */
5270 field_decl_cmp (const void *x_p, const void *y_p)
5272 const tree *const x = (const tree *const) x_p;
5273 const tree *const y = (const tree *const) y_p;
5275 if (DECL_NAME (*x) == DECL_NAME (*y))
5276 /* A nontype is "greater" than a type. */
5277 return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL);
5278 if (DECL_NAME (*x) == NULL_TREE)
5280 if (DECL_NAME (*y) == NULL_TREE)
5282 if (DECL_NAME (*x) < DECL_NAME (*y))
5288 gt_pointer_operator new_value;
5292 /* This routine compares two fields like field_decl_cmp but using the
5293 pointer operator in resort_data. */
5296 resort_field_decl_cmp (const void *x_p, const void *y_p)
5298 const tree *const x = (const tree *const) x_p;
5299 const tree *const y = (const tree *const) y_p;
5301 if (DECL_NAME (*x) == DECL_NAME (*y))
5302 /* A nontype is "greater" than a type. */
5303 return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL);
5304 if (DECL_NAME (*x) == NULL_TREE)
5306 if (DECL_NAME (*y) == NULL_TREE)
5309 tree d1 = DECL_NAME (*x);
5310 tree d2 = DECL_NAME (*y);
5311 resort_data.new_value (&d1, resort_data.cookie);
5312 resort_data.new_value (&d2, resort_data.cookie);
5319 /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */
5322 resort_sorted_fields (void *obj,
5323 void * ARG_UNUSED (orig_obj),
5324 gt_pointer_operator new_value,
5327 struct sorted_fields_type *sf = (struct sorted_fields_type *) obj;
5328 resort_data.new_value = new_value;
5329 resort_data.cookie = cookie;
5330 qsort (&sf->elts[0], sf->len, sizeof (tree),
5331 resort_field_decl_cmp);
5334 /* Issue the error given by MSGID, indicating that it occurred before
5335 TOKEN, which had the associated VALUE. */
5338 c_parse_error (const char *msgid, enum cpp_ttype token, tree value)
5340 const char *string = _(msgid);
5342 if (token == CPP_EOF)
5343 error ("%s at end of input", string);
5344 else if (token == CPP_CHAR || token == CPP_WCHAR)
5346 unsigned int val = TREE_INT_CST_LOW (value);
5347 const char *const ell = (token == CPP_CHAR) ? "" : "L";
5348 if (val <= UCHAR_MAX && ISGRAPH (val))
5349 error ("%s before %s'%c'", string, ell, val);
5351 error ("%s before %s'\\x%x'", string, ell, val);
5353 else if (token == CPP_STRING
5354 || token == CPP_WSTRING)
5355 error ("%s before string constant", string);
5356 else if (token == CPP_NUMBER)
5357 error ("%s before numeric constant", string);
5358 else if (token == CPP_NAME)
5359 error ("%s before \"%s\"", string, IDENTIFIER_POINTER (value));
5360 else if (token < N_TTYPES)
5361 error ("%s before '%s' token", string, cpp_type2name (token));
5363 error ("%s", string);
5366 /* Walk a gimplified function and warn for functions whose return value is
5367 ignored and attribute((warn_unused_result)) is set. This is done before
5368 inlining, so we don't have to worry about that. */
5371 c_warn_unused_result (tree *top_p)
5374 tree_stmt_iterator i;
5377 switch (TREE_CODE (t))
5379 case STATEMENT_LIST:
5380 for (i = tsi_start (*top_p); !tsi_end_p (i); tsi_next (&i))
5381 c_warn_unused_result (tsi_stmt_ptr (i));
5385 c_warn_unused_result (&COND_EXPR_THEN (t));
5386 c_warn_unused_result (&COND_EXPR_ELSE (t));
5389 c_warn_unused_result (&BIND_EXPR_BODY (t));
5391 case TRY_FINALLY_EXPR:
5392 case TRY_CATCH_EXPR:
5393 c_warn_unused_result (&TREE_OPERAND (t, 0));
5394 c_warn_unused_result (&TREE_OPERAND (t, 1));
5397 c_warn_unused_result (&CATCH_BODY (t));
5399 case EH_FILTER_EXPR:
5400 c_warn_unused_result (&EH_FILTER_FAILURE (t));
5407 /* This is a naked call, as opposed to a CALL_EXPR nested inside
5408 a MODIFY_EXPR. All calls whose value is ignored should be
5409 represented like this. Look for the attribute. */
5410 fdecl = get_callee_fndecl (t);
5412 ftype = TREE_TYPE (fdecl);
5415 ftype = TREE_TYPE (TREE_OPERAND (t, 0));
5416 /* Look past pointer-to-function to the function type itself. */
5417 ftype = TREE_TYPE (ftype);
5420 if (lookup_attribute ("warn_unused_result", TYPE_ATTRIBUTES (ftype)))
5423 warning ("%Hignoring return value of `%D', "
5424 "declared with attribute warn_unused_result",
5425 EXPR_LOCUS (t), fdecl);
5427 warning ("%Hignoring return value of function "
5428 "declared with attribute warn_unused_result",
5434 /* Not a container, not a call, or a call whose value is used. */
5439 /* Build the result of __builtin_offsetof. EXPR is a nested sequence of
5440 component references, with an INDIRECT_REF at the bottom; much like
5441 the traditional rendering of offsetof as a macro. Returns the folded
5442 and properly cast result. */
5445 fold_offsetof_1 (tree expr)
5447 enum tree_code code = PLUS_EXPR;
5450 switch (TREE_CODE (expr))
5456 return size_zero_node;
5459 base = fold_offsetof_1 (TREE_OPERAND (expr, 0));
5460 if (base == error_mark_node)
5463 t = TREE_OPERAND (expr, 1);
5464 if (DECL_C_BIT_FIELD (t))
5466 error ("attempt to take address of bit-field structure "
5467 "member `%s'", IDENTIFIER_POINTER (DECL_NAME (t)));
5468 return error_mark_node;
5470 off = size_binop (PLUS_EXPR, DECL_FIELD_OFFSET (t),
5471 size_int (tree_low_cst (DECL_FIELD_BIT_OFFSET (t), 1)
5476 base = fold_offsetof_1 (TREE_OPERAND (expr, 0));
5477 if (base == error_mark_node)
5480 t = TREE_OPERAND (expr, 1);
5481 if (TREE_CODE (t) == INTEGER_CST && tree_int_cst_sgn (t) < 0)
5484 t = fold (build1 (NEGATE_EXPR, TREE_TYPE (t), t));
5486 t = convert (sizetype, t);
5487 off = size_binop (MULT_EXPR, TYPE_SIZE_UNIT (TREE_TYPE (expr)), t);
5494 return size_binop (code, base, off);
5498 fold_offsetof (tree expr)
5500 /* Convert back from the internal sizetype to size_t. */
5501 return convert (size_type_node, fold_offsetof_1 (expr));
5504 #include "gt-c-common.h"