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 to generate thread-safe code for initializing local
465 int flag_threadsafe_statics = 1;
467 /* Nonzero means warn about implicit declarations. */
469 int warn_implicit = 1;
471 /* Maximum template instantiation depth. This limit is rather
472 arbitrary, but it exists to limit the time it takes to notice
473 infinite template instantiations. */
475 int max_tinst_depth = 500;
479 /* The elements of `ridpointers' are identifier nodes for the reserved
480 type names and storage classes. It is indexed by a RID_... value. */
483 tree (*make_fname_decl) (tree, int);
485 /* If non-NULL, the address of a language-specific function that
486 returns 1 for language-specific statement codes. */
487 int (*lang_statement_code_p) (enum tree_code);
489 /* If non-NULL, the address of a language-specific function that takes
490 any action required right before expand_function_end is called. */
491 void (*lang_expand_function_end) (void);
493 /* Nonzero means the expression being parsed will never be evaluated.
494 This is a count, since unevaluated expressions can nest. */
497 /* Information about how a function name is generated. */
500 tree *const decl; /* pointer to the VAR_DECL. */
501 const unsigned rid; /* RID number for the identifier. */
502 const int pretty; /* How pretty is it? */
505 /* The three ways of getting then name of the current function. */
507 const struct fname_var_t fname_vars[] =
509 /* C99 compliant __func__, must be first. */
510 {&c99_function_name_decl_node, RID_C99_FUNCTION_NAME, 0},
511 /* GCC __FUNCTION__ compliant. */
512 {&function_name_decl_node, RID_FUNCTION_NAME, 0},
513 /* GCC __PRETTY_FUNCTION__ compliant. */
514 {&pretty_function_name_decl_node, RID_PRETTY_FUNCTION_NAME, 1},
518 static int constant_fits_type_p (tree, tree);
519 static tree check_case_value (tree);
520 static bool check_case_bounds (tree, tree, tree *, tree *);
522 static tree handle_packed_attribute (tree *, tree, tree, int, bool *);
523 static tree handle_nocommon_attribute (tree *, tree, tree, int, bool *);
524 static tree handle_common_attribute (tree *, tree, tree, int, bool *);
525 static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *);
526 static tree handle_noinline_attribute (tree *, tree, tree, int, bool *);
527 static tree handle_always_inline_attribute (tree *, tree, tree, int,
529 static tree handle_used_attribute (tree *, tree, tree, int, bool *);
530 static tree handle_unused_attribute (tree *, tree, tree, int, bool *);
531 static tree handle_const_attribute (tree *, tree, tree, int, bool *);
532 static tree handle_transparent_union_attribute (tree *, tree, tree,
534 static tree handle_constructor_attribute (tree *, tree, tree, int, bool *);
535 static tree handle_destructor_attribute (tree *, tree, tree, int, bool *);
536 static tree handle_mode_attribute (tree *, tree, tree, int, bool *);
537 static tree handle_section_attribute (tree *, tree, tree, int, bool *);
538 static tree handle_aligned_attribute (tree *, tree, tree, int, bool *);
539 static tree handle_weak_attribute (tree *, tree, tree, int, bool *) ;
540 static tree handle_alias_attribute (tree *, tree, tree, int, bool *);
541 static tree handle_visibility_attribute (tree *, tree, tree, int,
543 static tree handle_tls_model_attribute (tree *, tree, tree, int,
545 static tree handle_no_instrument_function_attribute (tree *, tree,
547 static tree handle_malloc_attribute (tree *, tree, tree, int, bool *);
548 static tree handle_no_limit_stack_attribute (tree *, tree, tree, int,
550 static tree handle_pure_attribute (tree *, tree, tree, int, bool *);
551 static tree handle_deprecated_attribute (tree *, tree, tree, int,
553 static tree handle_vector_size_attribute (tree *, tree, tree, int,
555 static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *);
556 static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *);
557 static tree handle_cleanup_attribute (tree *, tree, tree, int, bool *);
558 static tree handle_warn_unused_result_attribute (tree *, tree, tree, int,
560 static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *);
562 static void check_function_nonnull (tree, tree);
563 static void check_nonnull_arg (void *, tree, unsigned HOST_WIDE_INT);
564 static bool nonnull_check_p (tree, unsigned HOST_WIDE_INT);
565 static bool get_nonnull_operand (tree, unsigned HOST_WIDE_INT *);
566 static int resort_field_decl_cmp (const void *, const void *);
568 /* Table of machine-independent attributes common to all C-like languages. */
569 const struct attribute_spec c_common_attribute_table[] =
571 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
572 { "packed", 0, 0, false, false, false,
573 handle_packed_attribute },
574 { "nocommon", 0, 0, true, false, false,
575 handle_nocommon_attribute },
576 { "common", 0, 0, true, false, false,
577 handle_common_attribute },
578 /* FIXME: logically, noreturn attributes should be listed as
579 "false, true, true" and apply to function types. But implementing this
580 would require all the places in the compiler that use TREE_THIS_VOLATILE
581 on a decl to identify non-returning functions to be located and fixed
582 to check the function type instead. */
583 { "noreturn", 0, 0, true, false, false,
584 handle_noreturn_attribute },
585 { "volatile", 0, 0, true, false, false,
586 handle_noreturn_attribute },
587 { "noinline", 0, 0, true, false, false,
588 handle_noinline_attribute },
589 { "always_inline", 0, 0, true, false, false,
590 handle_always_inline_attribute },
591 { "used", 0, 0, true, false, false,
592 handle_used_attribute },
593 { "unused", 0, 0, false, false, false,
594 handle_unused_attribute },
595 /* The same comments as for noreturn attributes apply to const ones. */
596 { "const", 0, 0, true, false, false,
597 handle_const_attribute },
598 { "transparent_union", 0, 0, false, false, false,
599 handle_transparent_union_attribute },
600 { "constructor", 0, 0, true, false, false,
601 handle_constructor_attribute },
602 { "destructor", 0, 0, true, false, false,
603 handle_destructor_attribute },
604 { "mode", 1, 1, false, true, false,
605 handle_mode_attribute },
606 { "section", 1, 1, true, false, false,
607 handle_section_attribute },
608 { "aligned", 0, 1, false, false, false,
609 handle_aligned_attribute },
610 { "weak", 0, 0, true, false, false,
611 handle_weak_attribute },
612 { "alias", 1, 1, true, false, false,
613 handle_alias_attribute },
614 { "no_instrument_function", 0, 0, true, false, false,
615 handle_no_instrument_function_attribute },
616 { "malloc", 0, 0, true, false, false,
617 handle_malloc_attribute },
618 { "no_stack_limit", 0, 0, true, false, false,
619 handle_no_limit_stack_attribute },
620 { "pure", 0, 0, true, false, false,
621 handle_pure_attribute },
622 { "deprecated", 0, 0, false, false, false,
623 handle_deprecated_attribute },
624 { "vector_size", 1, 1, false, true, false,
625 handle_vector_size_attribute },
626 { "visibility", 1, 1, false, false, false,
627 handle_visibility_attribute },
628 { "tls_model", 1, 1, true, false, false,
629 handle_tls_model_attribute },
630 { "nonnull", 0, -1, false, true, true,
631 handle_nonnull_attribute },
632 { "nothrow", 0, 0, true, false, false,
633 handle_nothrow_attribute },
634 { "may_alias", 0, 0, false, true, false, NULL },
635 { "cleanup", 1, 1, true, false, false,
636 handle_cleanup_attribute },
637 { "warn_unused_result", 0, 0, false, true, true,
638 handle_warn_unused_result_attribute },
639 { "sentinel", 0, 1, false, true, true,
640 handle_sentinel_attribute },
641 { NULL, 0, 0, false, false, false, NULL }
644 /* Give the specifications for the format attributes, used by C and all
647 const struct attribute_spec c_common_format_attribute_table[] =
649 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
650 { "format", 3, 3, false, true, true,
651 handle_format_attribute },
652 { "format_arg", 1, 1, false, true, true,
653 handle_format_arg_attribute },
654 { NULL, 0, 0, false, false, false, NULL }
657 /* Push current bindings for the function name VAR_DECLS. */
660 start_fname_decls (void)
663 tree saved = NULL_TREE;
665 for (ix = 0; fname_vars[ix].decl; ix++)
667 tree decl = *fname_vars[ix].decl;
671 saved = tree_cons (decl, build_int_cst (NULL_TREE, ix), saved);
672 *fname_vars[ix].decl = NULL_TREE;
675 if (saved || saved_function_name_decls)
676 /* Normally they'll have been NULL, so only push if we've got a
677 stack, or they are non-NULL. */
678 saved_function_name_decls = tree_cons (saved, NULL_TREE,
679 saved_function_name_decls);
682 /* Finish up the current bindings, adding them into the current function's
683 statement tree. This must be done _before_ finish_stmt_tree is called.
684 If there is no current function, we must be at file scope and no statements
685 are involved. Pop the previous bindings. */
688 finish_fname_decls (void)
691 tree stmts = NULL_TREE;
692 tree stack = saved_function_name_decls;
694 for (; stack && TREE_VALUE (stack); stack = TREE_CHAIN (stack))
695 append_to_statement_list (TREE_VALUE (stack), &stmts);
699 tree *bodyp = &DECL_SAVED_TREE (current_function_decl);
701 if (TREE_CODE (*bodyp) == BIND_EXPR)
702 bodyp = &BIND_EXPR_BODY (*bodyp);
704 append_to_statement_list (*bodyp, &stmts);
708 for (ix = 0; fname_vars[ix].decl; ix++)
709 *fname_vars[ix].decl = NULL_TREE;
713 /* We had saved values, restore them. */
716 for (saved = TREE_PURPOSE (stack); saved; saved = TREE_CHAIN (saved))
718 tree decl = TREE_PURPOSE (saved);
719 unsigned ix = TREE_INT_CST_LOW (TREE_VALUE (saved));
721 *fname_vars[ix].decl = decl;
723 stack = TREE_CHAIN (stack);
725 saved_function_name_decls = stack;
728 /* Return the text name of the current function, suitably prettified
729 by PRETTY_P. Return string must be freed by caller. */
732 fname_as_string (int pretty_p)
734 const char *name = "top level";
744 if (current_function_decl)
745 name = lang_hooks.decl_printable_name (current_function_decl, vrb);
747 if (c_lex_string_translate)
749 int len = strlen (name) + 3; /* Two for '"'s. One for NULL. */
750 cpp_string cstr = { 0, 0 }, strname;
752 namep = XNEWVEC (char, len);
753 snprintf (namep, len, "\"%s\"", name);
754 strname.text = (unsigned char *) namep;
755 strname.len = len - 1;
757 if (cpp_interpret_string (parse_in, &strname, 1, &cstr, false))
758 return (char *) cstr.text;
761 namep = xstrdup (name);
766 /* Expand DECL if it declares an entity not handled by the
770 c_expand_decl (tree decl)
772 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
774 /* Let the back-end know about this variable. */
775 if (!anon_aggr_type_p (TREE_TYPE (decl)))
776 emit_local_var (decl);
778 expand_anon_union_decl (decl, NULL_TREE,
779 DECL_ANON_UNION_ELEMS (decl));
788 /* Return the VAR_DECL for a const char array naming the current
789 function. If the VAR_DECL has not yet been created, create it
790 now. RID indicates how it should be formatted and IDENTIFIER_NODE
791 ID is its name (unfortunately C and C++ hold the RID values of
792 keywords in different places, so we can't derive RID from ID in
793 this language independent code. */
796 fname_decl (unsigned int rid, tree id)
799 tree decl = NULL_TREE;
801 for (ix = 0; fname_vars[ix].decl; ix++)
802 if (fname_vars[ix].rid == rid)
805 decl = *fname_vars[ix].decl;
808 /* If a tree is built here, it would normally have the lineno of
809 the current statement. Later this tree will be moved to the
810 beginning of the function and this line number will be wrong.
811 To avoid this problem set the lineno to 0 here; that prevents
812 it from appearing in the RTL. */
814 location_t saved_location = input_location;
815 #ifdef USE_MAPPED_LOCATION
816 input_location = UNKNOWN_LOCATION;
821 stmts = push_stmt_list ();
822 decl = (*make_fname_decl) (id, fname_vars[ix].pretty);
823 stmts = pop_stmt_list (stmts);
824 if (!IS_EMPTY_STMT (stmts))
825 saved_function_name_decls
826 = tree_cons (decl, stmts, saved_function_name_decls);
827 *fname_vars[ix].decl = decl;
828 input_location = saved_location;
830 if (!ix && !current_function_decl)
831 pedwarn ("%qD is not defined outside of function scope", decl);
836 /* Given a STRING_CST, give it a suitable array-of-chars data type. */
839 fix_string_type (tree value)
841 const int wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT;
842 const int wide_flag = TREE_TYPE (value) == wchar_array_type_node;
843 const int nchars_max = flag_isoc99 ? 4095 : 509;
844 int length = TREE_STRING_LENGTH (value);
846 tree e_type, i_type, a_type;
848 /* Compute the number of elements, for the array type. */
849 nchars = wide_flag ? length / wchar_bytes : length;
851 if (pedantic && nchars - 1 > nchars_max && !c_dialect_cxx ())
852 pedwarn ("string length %qd is greater than the length %qd ISO C%d compilers are required to support",
853 nchars - 1, nchars_max, flag_isoc99 ? 99 : 89);
855 e_type = wide_flag ? wchar_type_node : char_type_node;
856 /* Create the array type for the string constant. flag_const_strings
857 says make the string constant an array of const char so that
858 copying it to a non-const pointer will get a warning. For C++,
859 this is the standard behavior.
861 The C++ front end relies on TYPE_MAIN_VARIANT of a cv-qualified
862 array type being the unqualified version of that type.
863 Therefore, if we are constructing an array of const char, we must
864 construct the matching unqualified array type first. The C front
865 end does not require this, but it does no harm, so we do it
867 i_type = build_index_type (build_int_cst (NULL_TREE, nchars - 1));
868 a_type = build_array_type (e_type, i_type);
869 if (flag_const_strings)
871 /* bleah, c_build_qualified_type should set TYPE_MAIN_VARIANT. */
872 tree qa_type = c_build_qualified_type (a_type, TYPE_QUAL_CONST);
873 TYPE_MAIN_VARIANT (qa_type) = a_type;
877 TREE_TYPE (value) = a_type;
878 TREE_CONSTANT (value) = 1;
879 TREE_INVARIANT (value) = 1;
880 TREE_READONLY (value) = 1;
881 TREE_STATIC (value) = 1;
885 /* Print a warning if a constant expression had overflow in folding.
886 Invoke this function on every expression that the language
887 requires to be a constant expression.
888 Note the ANSI C standard says it is erroneous for a
889 constant expression to overflow. */
892 constant_expression_warning (tree value)
894 if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST
895 || TREE_CODE (value) == VECTOR_CST
896 || TREE_CODE (value) == COMPLEX_CST)
897 && TREE_CONSTANT_OVERFLOW (value) && pedantic)
898 pedwarn ("overflow in constant expression");
901 /* Print a warning if an expression had overflow in folding.
902 Invoke this function on every expression that
903 (1) appears in the source code, and
904 (2) might be a constant expression that overflowed, and
905 (3) is not already checked by convert_and_check;
906 however, do not invoke this function on operands of explicit casts. */
909 overflow_warning (tree value)
911 if ((TREE_CODE (value) == INTEGER_CST
912 || (TREE_CODE (value) == COMPLEX_CST
913 && TREE_CODE (TREE_REALPART (value)) == INTEGER_CST))
914 && TREE_OVERFLOW (value))
916 TREE_OVERFLOW (value) = 0;
917 if (skip_evaluation == 0)
918 warning ("integer overflow in expression");
920 else if ((TREE_CODE (value) == REAL_CST
921 || (TREE_CODE (value) == COMPLEX_CST
922 && TREE_CODE (TREE_REALPART (value)) == REAL_CST))
923 && TREE_OVERFLOW (value))
925 TREE_OVERFLOW (value) = 0;
926 if (skip_evaluation == 0)
927 warning ("floating point overflow in expression");
929 else if (TREE_CODE (value) == VECTOR_CST && TREE_OVERFLOW (value))
931 TREE_OVERFLOW (value) = 0;
932 if (skip_evaluation == 0)
933 warning ("vector overflow in expression");
937 /* Print a warning if a large constant is truncated to unsigned,
938 or if -Wconversion is used and a constant < 0 is converted to unsigned.
939 Invoke this function on every expression that might be implicitly
940 converted to an unsigned type. */
943 unsigned_conversion_warning (tree result, tree operand)
945 tree type = TREE_TYPE (result);
947 if (TREE_CODE (operand) == INTEGER_CST
948 && TREE_CODE (type) == INTEGER_TYPE
949 && TYPE_UNSIGNED (type)
950 && skip_evaluation == 0
951 && !int_fits_type_p (operand, type))
953 if (!int_fits_type_p (operand, c_common_signed_type (type)))
954 /* This detects cases like converting -129 or 256 to unsigned char. */
955 warning ("large integer implicitly truncated to unsigned type");
956 else if (warn_conversion)
957 warning ("negative integer implicitly converted to unsigned type");
961 /* Nonzero if constant C has a value that is permissible
962 for type TYPE (an INTEGER_TYPE). */
965 constant_fits_type_p (tree c, tree type)
967 if (TREE_CODE (c) == INTEGER_CST)
968 return int_fits_type_p (c, type);
970 c = convert (type, c);
971 return !TREE_OVERFLOW (c);
974 /* Nonzero if vector types T1 and T2 can be converted to each other
975 without an explicit cast. */
977 vector_types_convertible_p (tree t1, tree t2)
979 return targetm.vector_opaque_p (t1)
980 || targetm.vector_opaque_p (t2)
981 || (tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2))
982 && INTEGRAL_TYPE_P (TREE_TYPE (t1))
983 == INTEGRAL_TYPE_P (TREE_TYPE (t2)));
986 /* Convert EXPR to TYPE, warning about conversion problems with constants.
987 Invoke this function on every expression that is converted implicitly,
988 i.e. because of language rules and not because of an explicit cast. */
991 convert_and_check (tree type, tree expr)
993 tree t = convert (type, expr);
994 if (TREE_CODE (t) == INTEGER_CST)
996 if (TREE_OVERFLOW (t))
998 TREE_OVERFLOW (t) = 0;
1000 /* Do not diagnose overflow in a constant expression merely
1001 because a conversion overflowed. */
1002 TREE_CONSTANT_OVERFLOW (t) = TREE_CONSTANT_OVERFLOW (expr);
1004 /* No warning for converting 0x80000000 to int. */
1005 if (!(TYPE_UNSIGNED (type) < TYPE_UNSIGNED (TREE_TYPE (expr))
1006 && TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE
1007 && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (expr))))
1008 /* If EXPR fits in the unsigned version of TYPE,
1009 don't warn unless pedantic. */
1011 || TYPE_UNSIGNED (type)
1012 || !constant_fits_type_p (expr,
1013 c_common_unsigned_type (type)))
1014 && skip_evaluation == 0)
1015 warning ("overflow in implicit constant conversion");
1018 unsigned_conversion_warning (t, expr);
1023 /* A node in a list that describes references to variables (EXPR), which are
1024 either read accesses if WRITER is zero, or write accesses, in which case
1025 WRITER is the parent of EXPR. */
1032 /* Used to implement a cache the results of a call to verify_tree. We only
1033 use this for SAVE_EXPRs. */
1036 struct tlist_cache *next;
1037 struct tlist *cache_before_sp;
1038 struct tlist *cache_after_sp;
1042 /* Obstack to use when allocating tlist structures, and corresponding
1044 static struct obstack tlist_obstack;
1045 static char *tlist_firstobj = 0;
1047 /* Keep track of the identifiers we've warned about, so we can avoid duplicate
1049 static struct tlist *warned_ids;
1050 /* SAVE_EXPRs need special treatment. We process them only once and then
1051 cache the results. */
1052 static struct tlist_cache *save_expr_cache;
1054 static void add_tlist (struct tlist **, struct tlist *, tree, int);
1055 static void merge_tlist (struct tlist **, struct tlist *, int);
1056 static void verify_tree (tree, struct tlist **, struct tlist **, tree);
1057 static int warning_candidate_p (tree);
1058 static void warn_for_collisions (struct tlist *);
1059 static void warn_for_collisions_1 (tree, tree, struct tlist *, int);
1060 static struct tlist *new_tlist (struct tlist *, tree, tree);
1062 /* Create a new struct tlist and fill in its fields. */
1063 static struct tlist *
1064 new_tlist (struct tlist *next, tree t, tree writer)
1067 l = XOBNEW (&tlist_obstack, struct tlist);
1074 /* Add duplicates of the nodes found in ADD to the list *TO. If EXCLUDE_WRITER
1075 is nonnull, we ignore any node we find which has a writer equal to it. */
1078 add_tlist (struct tlist **to, struct tlist *add, tree exclude_writer, int copy)
1082 struct tlist *next = add->next;
1085 if (!exclude_writer || add->writer != exclude_writer)
1086 *to = copy ? new_tlist (*to, add->expr, add->writer) : add;
1091 /* Merge the nodes of ADD into TO. This merging process is done so that for
1092 each variable that already exists in TO, no new node is added; however if
1093 there is a write access recorded in ADD, and an occurrence on TO is only
1094 a read access, then the occurrence in TO will be modified to record the
1098 merge_tlist (struct tlist **to, struct tlist *add, int copy)
1100 struct tlist **end = to;
1103 end = &(*end)->next;
1109 struct tlist *next = add->next;
1111 for (tmp2 = *to; tmp2; tmp2 = tmp2->next)
1112 if (tmp2->expr == add->expr)
1116 tmp2->writer = add->writer;
1120 *end = copy ? add : new_tlist (NULL, add->expr, add->writer);
1121 end = &(*end)->next;
1128 /* WRITTEN is a variable, WRITER is its parent. Warn if any of the variable
1129 references in list LIST conflict with it, excluding reads if ONLY writers
1133 warn_for_collisions_1 (tree written, tree writer, struct tlist *list,
1138 /* Avoid duplicate warnings. */
1139 for (tmp = warned_ids; tmp; tmp = tmp->next)
1140 if (tmp->expr == written)
1145 if (list->expr == written
1146 && list->writer != writer
1147 && (!only_writes || list->writer)
1148 && DECL_NAME (list->expr))
1150 warned_ids = new_tlist (warned_ids, written, NULL_TREE);
1151 warning ("operation on %qs may be undefined",
1152 IDENTIFIER_POINTER (DECL_NAME (list->expr)));
1158 /* Given a list LIST of references to variables, find whether any of these
1159 can cause conflicts due to missing sequence points. */
1162 warn_for_collisions (struct tlist *list)
1166 for (tmp = list; tmp; tmp = tmp->next)
1169 warn_for_collisions_1 (tmp->expr, tmp->writer, list, 0);
1173 /* Return nonzero if X is a tree that can be verified by the sequence point
1176 warning_candidate_p (tree x)
1178 return TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == PARM_DECL;
1181 /* Walk the tree X, and record accesses to variables. If X is written by the
1182 parent tree, WRITER is the parent.
1183 We store accesses in one of the two lists: PBEFORE_SP, and PNO_SP. If this
1184 expression or its only operand forces a sequence point, then everything up
1185 to the sequence point is stored in PBEFORE_SP. Everything else gets stored
1187 Once we return, we will have emitted warnings if any subexpression before
1188 such a sequence point could be undefined. On a higher level, however, the
1189 sequence point may not be relevant, and we'll merge the two lists.
1191 Example: (b++, a) + b;
1192 The call that processes the COMPOUND_EXPR will store the increment of B
1193 in PBEFORE_SP, and the use of A in PNO_SP. The higher-level call that
1194 processes the PLUS_EXPR will need to merge the two lists so that
1195 eventually, all accesses end up on the same list (and we'll warn about the
1196 unordered subexpressions b++ and b.
1198 A note on merging. If we modify the former example so that our expression
1201 care must be taken not simply to add all three expressions into the final
1202 PNO_SP list. The function merge_tlist takes care of that by merging the
1203 before-SP list of the COMPOUND_EXPR into its after-SP list in a special
1204 way, so that no more than one access to B is recorded. */
1207 verify_tree (tree x, struct tlist **pbefore_sp, struct tlist **pno_sp,
1210 struct tlist *tmp_before, *tmp_nosp, *tmp_list2, *tmp_list3;
1211 enum tree_code code;
1212 enum tree_code_class cl;
1214 /* X may be NULL if it is the operand of an empty statement expression
1220 code = TREE_CODE (x);
1221 cl = TREE_CODE_CLASS (code);
1223 if (warning_candidate_p (x))
1225 *pno_sp = new_tlist (*pno_sp, x, writer);
1235 case TRUTH_ANDIF_EXPR:
1236 case TRUTH_ORIF_EXPR:
1237 tmp_before = tmp_nosp = tmp_list3 = 0;
1238 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE);
1239 warn_for_collisions (tmp_nosp);
1240 merge_tlist (pbefore_sp, tmp_before, 0);
1241 merge_tlist (pbefore_sp, tmp_nosp, 0);
1242 verify_tree (TREE_OPERAND (x, 1), &tmp_list3, pno_sp, NULL_TREE);
1243 merge_tlist (pbefore_sp, tmp_list3, 0);
1247 tmp_before = tmp_list2 = 0;
1248 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_list2, NULL_TREE);
1249 warn_for_collisions (tmp_list2);
1250 merge_tlist (pbefore_sp, tmp_before, 0);
1251 merge_tlist (pbefore_sp, tmp_list2, 1);
1253 tmp_list3 = tmp_nosp = 0;
1254 verify_tree (TREE_OPERAND (x, 1), &tmp_list3, &tmp_nosp, NULL_TREE);
1255 warn_for_collisions (tmp_nosp);
1256 merge_tlist (pbefore_sp, tmp_list3, 0);
1258 tmp_list3 = tmp_list2 = 0;
1259 verify_tree (TREE_OPERAND (x, 2), &tmp_list3, &tmp_list2, NULL_TREE);
1260 warn_for_collisions (tmp_list2);
1261 merge_tlist (pbefore_sp, tmp_list3, 0);
1262 /* Rather than add both tmp_nosp and tmp_list2, we have to merge the
1263 two first, to avoid warning for (a ? b++ : b++). */
1264 merge_tlist (&tmp_nosp, tmp_list2, 0);
1265 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
1268 case PREDECREMENT_EXPR:
1269 case PREINCREMENT_EXPR:
1270 case POSTDECREMENT_EXPR:
1271 case POSTINCREMENT_EXPR:
1272 verify_tree (TREE_OPERAND (x, 0), pno_sp, pno_sp, x);
1276 tmp_before = tmp_nosp = tmp_list3 = 0;
1277 verify_tree (TREE_OPERAND (x, 1), &tmp_before, &tmp_nosp, NULL_TREE);
1278 verify_tree (TREE_OPERAND (x, 0), &tmp_list3, &tmp_list3, x);
1279 /* Expressions inside the LHS are not ordered wrt. the sequence points
1280 in the RHS. Example:
1282 Despite the fact that the modification of "a" is in the before_sp
1283 list (tmp_before), it conflicts with the use of "a" in the LHS.
1284 We can handle this by adding the contents of tmp_list3
1285 to those of tmp_before, and redoing the collision warnings for that
1287 add_tlist (&tmp_before, tmp_list3, x, 1);
1288 warn_for_collisions (tmp_before);
1289 /* Exclude the LHS itself here; we first have to merge it into the
1290 tmp_nosp list. This is done to avoid warning for "a = a"; if we
1291 didn't exclude the LHS, we'd get it twice, once as a read and once
1293 add_tlist (pno_sp, tmp_list3, x, 0);
1294 warn_for_collisions_1 (TREE_OPERAND (x, 0), x, tmp_nosp, 1);
1296 merge_tlist (pbefore_sp, tmp_before, 0);
1297 if (warning_candidate_p (TREE_OPERAND (x, 0)))
1298 merge_tlist (&tmp_nosp, new_tlist (NULL, TREE_OPERAND (x, 0), x), 0);
1299 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 1);
1303 /* We need to warn about conflicts among arguments and conflicts between
1304 args and the function address. Side effects of the function address,
1305 however, are not ordered by the sequence point of the call. */
1306 tmp_before = tmp_nosp = tmp_list2 = tmp_list3 = 0;
1307 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE);
1308 if (TREE_OPERAND (x, 1))
1309 verify_tree (TREE_OPERAND (x, 1), &tmp_list2, &tmp_list3, NULL_TREE);
1310 merge_tlist (&tmp_list3, tmp_list2, 0);
1311 add_tlist (&tmp_before, tmp_list3, NULL_TREE, 0);
1312 add_tlist (&tmp_before, tmp_nosp, NULL_TREE, 0);
1313 warn_for_collisions (tmp_before);
1314 add_tlist (pbefore_sp, tmp_before, NULL_TREE, 0);
1318 /* Scan all the list, e.g. indices of multi dimensional array. */
1321 tmp_before = tmp_nosp = 0;
1322 verify_tree (TREE_VALUE (x), &tmp_before, &tmp_nosp, NULL_TREE);
1323 merge_tlist (&tmp_nosp, tmp_before, 0);
1324 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
1331 struct tlist_cache *t;
1332 for (t = save_expr_cache; t; t = t->next)
1338 t = XOBNEW (&tlist_obstack, struct tlist_cache);
1339 t->next = save_expr_cache;
1341 save_expr_cache = t;
1343 tmp_before = tmp_nosp = 0;
1344 verify_tree (TREE_OPERAND (x, 0), &tmp_before, &tmp_nosp, NULL_TREE);
1345 warn_for_collisions (tmp_nosp);
1350 struct tlist *t = tmp_nosp;
1352 merge_tlist (&tmp_list3, t, 0);
1354 t->cache_before_sp = tmp_before;
1355 t->cache_after_sp = tmp_list3;
1357 merge_tlist (pbefore_sp, t->cache_before_sp, 1);
1358 add_tlist (pno_sp, t->cache_after_sp, NULL_TREE, 1);
1363 /* For other expressions, simply recurse on their operands.
1364 Manual tail recursion for unary expressions.
1365 Other non-expressions need not be processed. */
1366 if (cl == tcc_unary)
1368 x = TREE_OPERAND (x, 0);
1372 else if (IS_EXPR_CODE_CLASS (cl))
1375 int max = TREE_CODE_LENGTH (TREE_CODE (x));
1376 for (lp = 0; lp < max; lp++)
1378 tmp_before = tmp_nosp = 0;
1379 verify_tree (TREE_OPERAND (x, lp), &tmp_before, &tmp_nosp, 0);
1380 merge_tlist (&tmp_nosp, tmp_before, 0);
1381 add_tlist (pno_sp, tmp_nosp, NULL_TREE, 0);
1388 /* Try to warn for undefined behavior in EXPR due to missing sequence
1392 verify_sequence_points (tree expr)
1394 struct tlist *before_sp = 0, *after_sp = 0;
1397 save_expr_cache = 0;
1398 if (tlist_firstobj == 0)
1400 gcc_obstack_init (&tlist_obstack);
1401 tlist_firstobj = (char *) obstack_alloc (&tlist_obstack, 0);
1404 verify_tree (expr, &before_sp, &after_sp, 0);
1405 warn_for_collisions (after_sp);
1406 obstack_free (&tlist_obstack, tlist_firstobj);
1409 /* Validate the expression after `case' and apply default promotions. */
1412 check_case_value (tree value)
1414 if (value == NULL_TREE)
1417 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
1418 STRIP_TYPE_NOPS (value);
1419 /* In C++, the following is allowed:
1422 switch (...) { case i: ... }
1424 So, we try to reduce the VALUE to a constant that way. */
1425 if (c_dialect_cxx ())
1427 value = decl_constant_value (value);
1428 STRIP_TYPE_NOPS (value);
1429 value = fold (value);
1432 if (TREE_CODE (value) != INTEGER_CST
1433 && value != error_mark_node)
1435 error ("case label does not reduce to an integer constant");
1436 value = error_mark_node;
1439 /* Promote char or short to int. */
1440 value = default_conversion (value);
1442 constant_expression_warning (value);
1447 /* See if the case values LOW and HIGH are in the range of the original
1448 type (i.e. before the default conversion to int) of the switch testing
1450 TYPE is the promoted type of the testing expression, and ORIG_TYPE is
1451 the type before promoting it. CASE_LOW_P is a pointer to the lower
1452 bound of the case label, and CASE_HIGH_P is the upper bound or NULL
1453 if the case is not a case range.
1454 The caller has to make sure that we are not called with NULL for
1455 CASE_LOW_P (i.e. the default case).
1456 Returns true if the case label is in range of ORIG_TYPE (satured or
1457 untouched) or false if the label is out of range. */
1460 check_case_bounds (tree type, tree orig_type,
1461 tree *case_low_p, tree *case_high_p)
1463 tree min_value, max_value;
1464 tree case_low = *case_low_p;
1465 tree case_high = case_high_p ? *case_high_p : case_low;
1467 /* If there was a problem with the original type, do nothing. */
1468 if (orig_type == error_mark_node)
1471 min_value = TYPE_MIN_VALUE (orig_type);
1472 max_value = TYPE_MAX_VALUE (orig_type);
1474 /* Case label is less than minimum for type. */
1475 if (tree_int_cst_compare (case_low, min_value) < 0
1476 && tree_int_cst_compare (case_high, min_value) < 0)
1478 warning ("case label value is less than minimum value for type");
1482 /* Case value is greater than maximum for type. */
1483 if (tree_int_cst_compare (case_low, max_value) > 0
1484 && tree_int_cst_compare (case_high, max_value) > 0)
1486 warning ("case label value exceeds maximum value for type");
1490 /* Saturate lower case label value to minimum. */
1491 if (tree_int_cst_compare (case_high, min_value) >= 0
1492 && tree_int_cst_compare (case_low, min_value) < 0)
1494 warning ("lower value in case label range"
1495 " less than minimum value for type");
1496 case_low = min_value;
1499 /* Saturate upper case label value to maximum. */
1500 if (tree_int_cst_compare (case_low, max_value) <= 0
1501 && tree_int_cst_compare (case_high, max_value) > 0)
1503 warning ("upper value in case label range"
1504 " exceeds maximum value for type");
1505 case_high = max_value;
1508 if (*case_low_p != case_low)
1509 *case_low_p = convert (type, case_low);
1510 if (case_high_p && *case_high_p != case_high)
1511 *case_high_p = convert (type, case_high);
1516 /* Return an integer type with BITS bits of precision,
1517 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
1520 c_common_type_for_size (unsigned int bits, int unsignedp)
1522 if (bits == TYPE_PRECISION (integer_type_node))
1523 return unsignedp ? unsigned_type_node : integer_type_node;
1525 if (bits == TYPE_PRECISION (signed_char_type_node))
1526 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
1528 if (bits == TYPE_PRECISION (short_integer_type_node))
1529 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
1531 if (bits == TYPE_PRECISION (long_integer_type_node))
1532 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
1534 if (bits == TYPE_PRECISION (long_long_integer_type_node))
1535 return (unsignedp ? long_long_unsigned_type_node
1536 : long_long_integer_type_node);
1538 if (bits == TYPE_PRECISION (widest_integer_literal_type_node))
1539 return (unsignedp ? widest_unsigned_literal_type_node
1540 : widest_integer_literal_type_node);
1542 if (bits <= TYPE_PRECISION (intQI_type_node))
1543 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
1545 if (bits <= TYPE_PRECISION (intHI_type_node))
1546 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
1548 if (bits <= TYPE_PRECISION (intSI_type_node))
1549 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
1551 if (bits <= TYPE_PRECISION (intDI_type_node))
1552 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
1557 /* Used for communication between c_common_type_for_mode and
1558 c_register_builtin_type. */
1559 static GTY(()) tree registered_builtin_types;
1561 /* Return a data type that has machine mode MODE.
1562 If the mode is an integer,
1563 then UNSIGNEDP selects between signed and unsigned types. */
1566 c_common_type_for_mode (enum machine_mode mode, int unsignedp)
1570 if (mode == TYPE_MODE (integer_type_node))
1571 return unsignedp ? unsigned_type_node : integer_type_node;
1573 if (mode == TYPE_MODE (signed_char_type_node))
1574 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
1576 if (mode == TYPE_MODE (short_integer_type_node))
1577 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
1579 if (mode == TYPE_MODE (long_integer_type_node))
1580 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
1582 if (mode == TYPE_MODE (long_long_integer_type_node))
1583 return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node;
1585 if (mode == TYPE_MODE (widest_integer_literal_type_node))
1586 return unsignedp ? widest_unsigned_literal_type_node
1587 : widest_integer_literal_type_node;
1590 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
1593 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
1596 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
1599 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
1601 #if HOST_BITS_PER_WIDE_INT >= 64
1602 if (mode == TYPE_MODE (intTI_type_node))
1603 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
1606 if (mode == TYPE_MODE (float_type_node))
1607 return float_type_node;
1609 if (mode == TYPE_MODE (double_type_node))
1610 return double_type_node;
1612 if (mode == TYPE_MODE (long_double_type_node))
1613 return long_double_type_node;
1615 if (mode == TYPE_MODE (void_type_node))
1616 return void_type_node;
1618 if (mode == TYPE_MODE (build_pointer_type (char_type_node)))
1619 return unsignedp ? make_unsigned_type (mode) : make_signed_type (mode);
1621 if (mode == TYPE_MODE (build_pointer_type (integer_type_node)))
1622 return unsignedp ? make_unsigned_type (mode) : make_signed_type (mode);
1624 if (VECTOR_MODE_P (mode))
1626 enum machine_mode inner_mode = GET_MODE_INNER (mode);
1627 tree inner_type = c_common_type_for_mode (inner_mode, unsignedp);
1628 if (inner_type != NULL_TREE)
1629 return build_vector_type_for_mode (inner_type, mode);
1632 for (t = registered_builtin_types; t; t = TREE_CHAIN (t))
1633 if (TYPE_MODE (TREE_VALUE (t)) == mode)
1634 return TREE_VALUE (t);
1639 /* Return an unsigned type the same as TYPE in other respects. */
1641 c_common_unsigned_type (tree type)
1643 tree type1 = TYPE_MAIN_VARIANT (type);
1644 if (type1 == signed_char_type_node || type1 == char_type_node)
1645 return unsigned_char_type_node;
1646 if (type1 == integer_type_node)
1647 return unsigned_type_node;
1648 if (type1 == short_integer_type_node)
1649 return short_unsigned_type_node;
1650 if (type1 == long_integer_type_node)
1651 return long_unsigned_type_node;
1652 if (type1 == long_long_integer_type_node)
1653 return long_long_unsigned_type_node;
1654 if (type1 == widest_integer_literal_type_node)
1655 return widest_unsigned_literal_type_node;
1656 #if HOST_BITS_PER_WIDE_INT >= 64
1657 if (type1 == intTI_type_node)
1658 return unsigned_intTI_type_node;
1660 if (type1 == intDI_type_node)
1661 return unsigned_intDI_type_node;
1662 if (type1 == intSI_type_node)
1663 return unsigned_intSI_type_node;
1664 if (type1 == intHI_type_node)
1665 return unsigned_intHI_type_node;
1666 if (type1 == intQI_type_node)
1667 return unsigned_intQI_type_node;
1669 return c_common_signed_or_unsigned_type (1, type);
1672 /* Return a signed type the same as TYPE in other respects. */
1675 c_common_signed_type (tree type)
1677 tree type1 = TYPE_MAIN_VARIANT (type);
1678 if (type1 == unsigned_char_type_node || type1 == char_type_node)
1679 return signed_char_type_node;
1680 if (type1 == unsigned_type_node)
1681 return integer_type_node;
1682 if (type1 == short_unsigned_type_node)
1683 return short_integer_type_node;
1684 if (type1 == long_unsigned_type_node)
1685 return long_integer_type_node;
1686 if (type1 == long_long_unsigned_type_node)
1687 return long_long_integer_type_node;
1688 if (type1 == widest_unsigned_literal_type_node)
1689 return widest_integer_literal_type_node;
1690 #if HOST_BITS_PER_WIDE_INT >= 64
1691 if (type1 == unsigned_intTI_type_node)
1692 return intTI_type_node;
1694 if (type1 == unsigned_intDI_type_node)
1695 return intDI_type_node;
1696 if (type1 == unsigned_intSI_type_node)
1697 return intSI_type_node;
1698 if (type1 == unsigned_intHI_type_node)
1699 return intHI_type_node;
1700 if (type1 == unsigned_intQI_type_node)
1701 return intQI_type_node;
1703 return c_common_signed_or_unsigned_type (0, type);
1706 /* Return a type the same as TYPE except unsigned or
1707 signed according to UNSIGNEDP. */
1710 c_common_signed_or_unsigned_type (int unsignedp, tree type)
1712 if (!INTEGRAL_TYPE_P (type)
1713 || TYPE_UNSIGNED (type) == unsignedp)
1716 /* For ENUMERAL_TYPEs in C++, must check the mode of the types, not
1717 the precision; they have precision set to match their range, but
1718 may use a wider mode to match an ABI. If we change modes, we may
1719 wind up with bad conversions. For INTEGER_TYPEs in C, must check
1720 the precision as well, so as to yield correct results for
1721 bit-field types. C++ does not have these separate bit-field
1722 types, and producing a signed or unsigned variant of an
1723 ENUMERAL_TYPE may cause other problems as well. */
1725 #define TYPE_OK(node) \
1726 (TYPE_MODE (type) == TYPE_MODE (node) \
1727 && (c_dialect_cxx () || TYPE_PRECISION (type) == TYPE_PRECISION (node)))
1728 if (TYPE_OK (signed_char_type_node))
1729 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
1730 if (TYPE_OK (integer_type_node))
1731 return unsignedp ? unsigned_type_node : integer_type_node;
1732 if (TYPE_OK (short_integer_type_node))
1733 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
1734 if (TYPE_OK (long_integer_type_node))
1735 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
1736 if (TYPE_OK (long_long_integer_type_node))
1737 return (unsignedp ? long_long_unsigned_type_node
1738 : long_long_integer_type_node);
1739 if (TYPE_OK (widest_integer_literal_type_node))
1740 return (unsignedp ? widest_unsigned_literal_type_node
1741 : widest_integer_literal_type_node);
1743 #if HOST_BITS_PER_WIDE_INT >= 64
1744 if (TYPE_OK (intTI_type_node))
1745 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
1747 if (TYPE_OK (intDI_type_node))
1748 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
1749 if (TYPE_OK (intSI_type_node))
1750 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
1751 if (TYPE_OK (intHI_type_node))
1752 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
1753 if (TYPE_OK (intQI_type_node))
1754 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
1757 if (c_dialect_cxx ())
1760 return build_nonstandard_integer_type (TYPE_PRECISION (type), unsignedp);
1763 /* The C version of the register_builtin_type langhook. */
1766 c_register_builtin_type (tree type, const char* name)
1770 decl = build_decl (TYPE_DECL, get_identifier (name), type);
1771 DECL_ARTIFICIAL (decl) = 1;
1772 if (!TYPE_NAME (type))
1773 TYPE_NAME (type) = decl;
1776 registered_builtin_types = tree_cons (0, type, registered_builtin_types);
1780 /* Return the minimum number of bits needed to represent VALUE in a
1781 signed or unsigned type, UNSIGNEDP says which. */
1784 min_precision (tree value, int unsignedp)
1788 /* If the value is negative, compute its negative minus 1. The latter
1789 adjustment is because the absolute value of the largest negative value
1790 is one larger than the largest positive value. This is equivalent to
1791 a bit-wise negation, so use that operation instead. */
1793 if (tree_int_cst_sgn (value) < 0)
1794 value = fold (build1 (BIT_NOT_EXPR, TREE_TYPE (value), value));
1796 /* Return the number of bits needed, taking into account the fact
1797 that we need one more bit for a signed than unsigned type. */
1799 if (integer_zerop (value))
1802 log = tree_floor_log2 (value);
1804 return log + 1 + !unsignedp;
1807 /* Print an error message for invalid operands to arith operation
1808 CODE. NOP_EXPR is used as a special case (see
1809 c_common_truthvalue_conversion). */
1812 binary_op_error (enum tree_code code)
1819 error ("invalid truth-value expression");
1823 opname = "+"; break;
1825 opname = "-"; break;
1827 opname = "*"; break;
1829 opname = "max"; break;
1831 opname = "min"; break;
1833 opname = "=="; break;
1835 opname = "!="; break;
1837 opname = "<="; break;
1839 opname = ">="; break;
1841 opname = "<"; break;
1843 opname = ">"; break;
1845 opname = "<<"; break;
1847 opname = ">>"; break;
1848 case TRUNC_MOD_EXPR:
1849 case FLOOR_MOD_EXPR:
1850 opname = "%"; break;
1851 case TRUNC_DIV_EXPR:
1852 case FLOOR_DIV_EXPR:
1853 opname = "/"; break;
1855 opname = "&"; break;
1857 opname = "|"; break;
1858 case TRUTH_ANDIF_EXPR:
1859 opname = "&&"; break;
1860 case TRUTH_ORIF_EXPR:
1861 opname = "||"; break;
1863 opname = "^"; break;
1867 error ("invalid operands to binary %s", opname);
1870 /* Subroutine of build_binary_op, used for comparison operations.
1871 See if the operands have both been converted from subword integer types
1872 and, if so, perhaps change them both back to their original type.
1873 This function is also responsible for converting the two operands
1874 to the proper common type for comparison.
1876 The arguments of this function are all pointers to local variables
1877 of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1,
1878 RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE.
1880 If this function returns nonzero, it means that the comparison has
1881 a constant value. What this function returns is an expression for
1885 shorten_compare (tree *op0_ptr, tree *op1_ptr, tree *restype_ptr,
1886 enum tree_code *rescode_ptr)
1889 tree op0 = *op0_ptr;
1890 tree op1 = *op1_ptr;
1891 int unsignedp0, unsignedp1;
1893 tree primop0, primop1;
1894 enum tree_code code = *rescode_ptr;
1896 /* Throw away any conversions to wider types
1897 already present in the operands. */
1899 primop0 = get_narrower (op0, &unsignedp0);
1900 primop1 = get_narrower (op1, &unsignedp1);
1902 /* Handle the case that OP0 does not *contain* a conversion
1903 but it *requires* conversion to FINAL_TYPE. */
1905 if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr)
1906 unsignedp0 = TYPE_UNSIGNED (TREE_TYPE (op0));
1907 if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr)
1908 unsignedp1 = TYPE_UNSIGNED (TREE_TYPE (op1));
1910 /* If one of the operands must be floated, we cannot optimize. */
1911 real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE;
1912 real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE;
1914 /* If first arg is constant, swap the args (changing operation
1915 so value is preserved), for canonicalization. Don't do this if
1916 the second arg is 0. */
1918 if (TREE_CONSTANT (primop0)
1919 && !integer_zerop (primop1) && !real_zerop (primop1))
1922 int temi = unsignedp0;
1930 unsignedp0 = unsignedp1;
1953 *rescode_ptr = code;
1956 /* If comparing an integer against a constant more bits wide,
1957 maybe we can deduce a value of 1 or 0 independent of the data.
1958 Or else truncate the constant now
1959 rather than extend the variable at run time.
1961 This is only interesting if the constant is the wider arg.
1962 Also, it is not safe if the constant is unsigned and the
1963 variable arg is signed, since in this case the variable
1964 would be sign-extended and then regarded as unsigned.
1965 Our technique fails in this case because the lowest/highest
1966 possible unsigned results don't follow naturally from the
1967 lowest/highest possible values of the variable operand.
1968 For just EQ_EXPR and NE_EXPR there is another technique that
1969 could be used: see if the constant can be faithfully represented
1970 in the other operand's type, by truncating it and reextending it
1971 and see if that preserves the constant's value. */
1973 if (!real1 && !real2
1974 && TREE_CODE (primop1) == INTEGER_CST
1975 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr))
1977 int min_gt, max_gt, min_lt, max_lt;
1978 tree maxval, minval;
1979 /* 1 if comparison is nominally unsigned. */
1980 int unsignedp = TYPE_UNSIGNED (*restype_ptr);
1983 type = c_common_signed_or_unsigned_type (unsignedp0,
1984 TREE_TYPE (primop0));
1986 maxval = TYPE_MAX_VALUE (type);
1987 minval = TYPE_MIN_VALUE (type);
1989 if (unsignedp && !unsignedp0)
1990 *restype_ptr = c_common_signed_type (*restype_ptr);
1992 if (TREE_TYPE (primop1) != *restype_ptr)
1994 /* Convert primop1 to target type, but do not introduce
1995 additional overflow. We know primop1 is an int_cst. */
1996 tree tmp = build_int_cst_wide (*restype_ptr,
1997 TREE_INT_CST_LOW (primop1),
1998 TREE_INT_CST_HIGH (primop1));
2000 primop1 = force_fit_type (tmp, 0, TREE_OVERFLOW (primop1),
2001 TREE_CONSTANT_OVERFLOW (primop1));
2003 if (type != *restype_ptr)
2005 minval = convert (*restype_ptr, minval);
2006 maxval = convert (*restype_ptr, maxval);
2009 if (unsignedp && unsignedp0)
2011 min_gt = INT_CST_LT_UNSIGNED (primop1, minval);
2012 max_gt = INT_CST_LT_UNSIGNED (primop1, maxval);
2013 min_lt = INT_CST_LT_UNSIGNED (minval, primop1);
2014 max_lt = INT_CST_LT_UNSIGNED (maxval, primop1);
2018 min_gt = INT_CST_LT (primop1, minval);
2019 max_gt = INT_CST_LT (primop1, maxval);
2020 min_lt = INT_CST_LT (minval, primop1);
2021 max_lt = INT_CST_LT (maxval, primop1);
2025 /* This used to be a switch, but Genix compiler can't handle that. */
2026 if (code == NE_EXPR)
2028 if (max_lt || min_gt)
2029 val = truthvalue_true_node;
2031 else if (code == EQ_EXPR)
2033 if (max_lt || min_gt)
2034 val = truthvalue_false_node;
2036 else if (code == LT_EXPR)
2039 val = truthvalue_true_node;
2041 val = truthvalue_false_node;
2043 else if (code == GT_EXPR)
2046 val = truthvalue_true_node;
2048 val = truthvalue_false_node;
2050 else if (code == LE_EXPR)
2053 val = truthvalue_true_node;
2055 val = truthvalue_false_node;
2057 else if (code == GE_EXPR)
2060 val = truthvalue_true_node;
2062 val = truthvalue_false_node;
2065 /* If primop0 was sign-extended and unsigned comparison specd,
2066 we did a signed comparison above using the signed type bounds.
2067 But the comparison we output must be unsigned.
2069 Also, for inequalities, VAL is no good; but if the signed
2070 comparison had *any* fixed result, it follows that the
2071 unsigned comparison just tests the sign in reverse
2072 (positive values are LE, negative ones GE).
2073 So we can generate an unsigned comparison
2074 against an extreme value of the signed type. */
2076 if (unsignedp && !unsignedp0)
2083 primop1 = TYPE_MIN_VALUE (type);
2089 primop1 = TYPE_MAX_VALUE (type);
2096 type = c_common_unsigned_type (type);
2099 if (TREE_CODE (primop0) != INTEGER_CST)
2101 if (val == truthvalue_false_node)
2102 warning ("comparison is always false due to limited range of data type");
2103 if (val == truthvalue_true_node)
2104 warning ("comparison is always true due to limited range of data type");
2109 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
2110 if (TREE_SIDE_EFFECTS (primop0))
2111 return build2 (COMPOUND_EXPR, TREE_TYPE (val), primop0, val);
2115 /* Value is not predetermined, but do the comparison
2116 in the type of the operand that is not constant.
2117 TYPE is already properly set. */
2119 else if (real1 && real2
2120 && (TYPE_PRECISION (TREE_TYPE (primop0))
2121 == TYPE_PRECISION (TREE_TYPE (primop1))))
2122 type = TREE_TYPE (primop0);
2124 /* If args' natural types are both narrower than nominal type
2125 and both extend in the same manner, compare them
2126 in the type of the wider arg.
2127 Otherwise must actually extend both to the nominal
2128 common type lest different ways of extending
2130 (eg, (short)-1 == (unsigned short)-1 should be 0.) */
2132 else if (unsignedp0 == unsignedp1 && real1 == real2
2133 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)
2134 && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr))
2136 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1));
2137 type = c_common_signed_or_unsigned_type (unsignedp0
2138 || TYPE_UNSIGNED (*restype_ptr),
2140 /* Make sure shorter operand is extended the right way
2141 to match the longer operand. */
2143 = convert (c_common_signed_or_unsigned_type (unsignedp0,
2144 TREE_TYPE (primop0)),
2147 = convert (c_common_signed_or_unsigned_type (unsignedp1,
2148 TREE_TYPE (primop1)),
2153 /* Here we must do the comparison on the nominal type
2154 using the args exactly as we received them. */
2155 type = *restype_ptr;
2159 if (!real1 && !real2 && integer_zerop (primop1)
2160 && TYPE_UNSIGNED (*restype_ptr))
2166 /* All unsigned values are >= 0, so we warn if extra warnings
2167 are requested. However, if OP0 is a constant that is
2168 >= 0, the signedness of the comparison isn't an issue,
2169 so suppress the warning. */
2170 if (extra_warnings && !in_system_header
2171 && !(TREE_CODE (primop0) == INTEGER_CST
2172 && !TREE_OVERFLOW (convert (c_common_signed_type (type),
2174 warning ("comparison of unsigned expression >= 0 is always true");
2175 value = truthvalue_true_node;
2179 if (extra_warnings && !in_system_header
2180 && !(TREE_CODE (primop0) == INTEGER_CST
2181 && !TREE_OVERFLOW (convert (c_common_signed_type (type),
2183 warning ("comparison of unsigned expression < 0 is always false");
2184 value = truthvalue_false_node;
2193 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
2194 if (TREE_SIDE_EFFECTS (primop0))
2195 return build2 (COMPOUND_EXPR, TREE_TYPE (value),
2202 *op0_ptr = convert (type, primop0);
2203 *op1_ptr = convert (type, primop1);
2205 *restype_ptr = truthvalue_type_node;
2210 /* Return a tree for the sum or difference (RESULTCODE says which)
2211 of pointer PTROP and integer INTOP. */
2214 pointer_int_sum (enum tree_code resultcode, tree ptrop, tree intop)
2218 /* The result is a pointer of the same type that is being added. */
2220 tree result_type = TREE_TYPE (ptrop);
2222 if (TREE_CODE (TREE_TYPE (result_type)) == VOID_TYPE)
2224 if (pedantic || warn_pointer_arith)
2225 pedwarn ("pointer of type %<void *%> used in arithmetic");
2226 size_exp = integer_one_node;
2228 else if (TREE_CODE (TREE_TYPE (result_type)) == FUNCTION_TYPE)
2230 if (pedantic || warn_pointer_arith)
2231 pedwarn ("pointer to a function used in arithmetic");
2232 size_exp = integer_one_node;
2234 else if (TREE_CODE (TREE_TYPE (result_type)) == METHOD_TYPE)
2236 if (pedantic || warn_pointer_arith)
2237 pedwarn ("pointer to member function used in arithmetic");
2238 size_exp = integer_one_node;
2241 size_exp = size_in_bytes (TREE_TYPE (result_type));
2243 /* If what we are about to multiply by the size of the elements
2244 contains a constant term, apply distributive law
2245 and multiply that constant term separately.
2246 This helps produce common subexpressions. */
2248 if ((TREE_CODE (intop) == PLUS_EXPR || TREE_CODE (intop) == MINUS_EXPR)
2249 && !TREE_CONSTANT (intop)
2250 && TREE_CONSTANT (TREE_OPERAND (intop, 1))
2251 && TREE_CONSTANT (size_exp)
2252 /* If the constant comes from pointer subtraction,
2253 skip this optimization--it would cause an error. */
2254 && TREE_CODE (TREE_TYPE (TREE_OPERAND (intop, 0))) == INTEGER_TYPE
2255 /* If the constant is unsigned, and smaller than the pointer size,
2256 then we must skip this optimization. This is because it could cause
2257 an overflow error if the constant is negative but INTOP is not. */
2258 && (!TYPE_UNSIGNED (TREE_TYPE (intop))
2259 || (TYPE_PRECISION (TREE_TYPE (intop))
2260 == TYPE_PRECISION (TREE_TYPE (ptrop)))))
2262 enum tree_code subcode = resultcode;
2263 tree int_type = TREE_TYPE (intop);
2264 if (TREE_CODE (intop) == MINUS_EXPR)
2265 subcode = (subcode == PLUS_EXPR ? MINUS_EXPR : PLUS_EXPR);
2266 /* Convert both subexpression types to the type of intop,
2267 because weird cases involving pointer arithmetic
2268 can result in a sum or difference with different type args. */
2269 ptrop = build_binary_op (subcode, ptrop,
2270 convert (int_type, TREE_OPERAND (intop, 1)), 1);
2271 intop = convert (int_type, TREE_OPERAND (intop, 0));
2274 /* Convert the integer argument to a type the same size as sizetype
2275 so the multiply won't overflow spuriously. */
2277 if (TYPE_PRECISION (TREE_TYPE (intop)) != TYPE_PRECISION (sizetype)
2278 || TYPE_UNSIGNED (TREE_TYPE (intop)) != TYPE_UNSIGNED (sizetype))
2279 intop = convert (c_common_type_for_size (TYPE_PRECISION (sizetype),
2280 TYPE_UNSIGNED (sizetype)), intop);
2282 /* Replace the integer argument with a suitable product by the object size.
2283 Do this multiplication as signed, then convert to the appropriate
2284 pointer type (actually unsigned integral). */
2286 intop = convert (result_type,
2287 build_binary_op (MULT_EXPR, intop,
2288 convert (TREE_TYPE (intop), size_exp), 1));
2290 /* Create the sum or difference. */
2291 return fold (build2 (resultcode, result_type, ptrop, intop));
2294 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
2295 or validate its data type for an `if' or `while' statement or ?..: exp.
2297 This preparation consists of taking the ordinary
2298 representation of an expression expr and producing a valid tree
2299 boolean expression describing whether expr is nonzero. We could
2300 simply always do build_binary_op (NE_EXPR, expr, truthvalue_false_node, 1),
2301 but we optimize comparisons, &&, ||, and !.
2303 The resulting type should always be `truthvalue_type_node'. */
2306 c_common_truthvalue_conversion (tree expr)
2308 if (TREE_CODE (expr) == ERROR_MARK)
2311 if (TREE_CODE (expr) == FUNCTION_DECL)
2312 expr = build_unary_op (ADDR_EXPR, expr, 0);
2314 switch (TREE_CODE (expr))
2316 case EQ_EXPR: case NE_EXPR: case UNEQ_EXPR: case LTGT_EXPR:
2317 case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR:
2318 case UNLE_EXPR: case UNGE_EXPR: case UNLT_EXPR: case UNGT_EXPR:
2319 case ORDERED_EXPR: case UNORDERED_EXPR:
2320 case TRUTH_ANDIF_EXPR:
2321 case TRUTH_ORIF_EXPR:
2322 case TRUTH_AND_EXPR:
2324 case TRUTH_XOR_EXPR:
2325 case TRUTH_NOT_EXPR:
2326 TREE_TYPE (expr) = truthvalue_type_node;
2333 return integer_zerop (expr) ? truthvalue_false_node : truthvalue_true_node;
2336 return real_zerop (expr) ? truthvalue_false_node : truthvalue_true_node;
2340 if (TREE_CODE (TREE_OPERAND (expr, 0)) == FUNCTION_DECL
2341 && !DECL_WEAK (TREE_OPERAND (expr, 0)))
2343 /* Common Ada/Pascal programmer's mistake. We always warn
2344 about this since it is so bad. */
2345 warning ("the address of %qD, will always evaluate as %<true%>",
2346 TREE_OPERAND (expr, 0));
2347 return truthvalue_true_node;
2350 /* If we are taking the address of an external decl, it might be
2351 zero if it is weak, so we cannot optimize. */
2352 if (DECL_P (TREE_OPERAND (expr, 0))
2353 && DECL_EXTERNAL (TREE_OPERAND (expr, 0)))
2356 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 0)))
2357 return build2 (COMPOUND_EXPR, truthvalue_type_node,
2358 TREE_OPERAND (expr, 0), truthvalue_true_node);
2360 return truthvalue_true_node;
2364 return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))
2365 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
2366 lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0)),
2367 lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 1)),
2373 /* These don't change whether an object is nonzero or zero. */
2374 return lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0));
2378 /* These don't change whether an object is zero or nonzero, but
2379 we can't ignore them if their second arg has side-effects. */
2380 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)))
2381 return build2 (COMPOUND_EXPR, truthvalue_type_node,
2382 TREE_OPERAND (expr, 1),
2383 lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0)));
2385 return lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0));
2388 /* Distribute the conversion into the arms of a COND_EXPR. */
2389 return fold (build3 (COND_EXPR, truthvalue_type_node,
2390 TREE_OPERAND (expr, 0),
2391 lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 1)),
2392 lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 2))));
2395 /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE,
2396 since that affects how `default_conversion' will behave. */
2397 if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE
2398 || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE)
2400 /* Fall through.... */
2402 /* If this is widening the argument, we can ignore it. */
2403 if (TYPE_PRECISION (TREE_TYPE (expr))
2404 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0))))
2405 return lang_hooks.truthvalue_conversion (TREE_OPERAND (expr, 0));
2409 /* Perhaps reduce (x - y) != 0 to (x != y). The expressions
2410 aren't guaranteed to the be same for modes that can represent
2411 infinity, since if x and y are both +infinity, or both
2412 -infinity, then x - y is not a number.
2414 Note that this transformation is safe when x or y is NaN.
2415 (x - y) is then NaN, and both (x - y) != 0 and x != y will
2417 if (HONOR_INFINITIES (TYPE_MODE (TREE_TYPE (TREE_OPERAND (expr, 0)))))
2419 /* Fall through.... */
2421 /* This and MINUS_EXPR can be changed into a comparison of the
2423 if (TREE_TYPE (TREE_OPERAND (expr, 0))
2424 == TREE_TYPE (TREE_OPERAND (expr, 1)))
2425 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
2426 TREE_OPERAND (expr, 1), 1);
2427 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
2428 fold (build1 (NOP_EXPR,
2429 TREE_TYPE (TREE_OPERAND (expr, 0)),
2430 TREE_OPERAND (expr, 1))), 1);
2433 if (integer_onep (TREE_OPERAND (expr, 1))
2434 && TREE_TYPE (expr) != truthvalue_type_node)
2435 /* Using convert here would cause infinite recursion. */
2436 return build1 (NOP_EXPR, truthvalue_type_node, expr);
2440 if (warn_parentheses && !TREE_NO_WARNING (expr))
2441 warning ("suggest parentheses around assignment used as truth value");
2448 if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE)
2450 tree t = save_expr (expr);
2451 return (build_binary_op
2452 ((TREE_SIDE_EFFECTS (expr)
2453 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
2454 lang_hooks.truthvalue_conversion (build_unary_op (REALPART_EXPR, t, 0)),
2455 lang_hooks.truthvalue_conversion (build_unary_op (IMAGPART_EXPR, t, 0)),
2459 return build_binary_op (NE_EXPR, expr, integer_zero_node, 1);
2462 static tree builtin_function_2 (const char *builtin_name, const char *name,
2463 tree builtin_type, tree type,
2464 enum built_in_function function_code,
2465 enum built_in_class cl, int library_name_p,
2469 /* Make a variant type in the proper way for C/C++, propagating qualifiers
2470 down to the element type of an array. */
2473 c_build_qualified_type (tree type, int type_quals)
2475 if (type == error_mark_node)
2478 if (TREE_CODE (type) == ARRAY_TYPE)
2479 return build_array_type (c_build_qualified_type (TREE_TYPE (type),
2481 TYPE_DOMAIN (type));
2483 /* A restrict-qualified pointer type must be a pointer to object or
2484 incomplete type. Note that the use of POINTER_TYPE_P also allows
2485 REFERENCE_TYPEs, which is appropriate for C++. */
2486 if ((type_quals & TYPE_QUAL_RESTRICT)
2487 && (!POINTER_TYPE_P (type)
2488 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))))
2490 error ("invalid use of %<restrict%>");
2491 type_quals &= ~TYPE_QUAL_RESTRICT;
2494 return build_qualified_type (type, type_quals);
2497 /* Apply the TYPE_QUALS to the new DECL. */
2500 c_apply_type_quals_to_decl (int type_quals, tree decl)
2502 tree type = TREE_TYPE (decl);
2504 if (type == error_mark_node)
2507 if (((type_quals & TYPE_QUAL_CONST)
2508 || (type && TREE_CODE (type) == REFERENCE_TYPE))
2509 /* An object declared 'const' is only readonly after it is
2510 initialized. We don't have any way of expressing this currently,
2511 so we need to be conservative and unset TREE_READONLY for types
2512 with constructors. Otherwise aliasing code will ignore stores in
2513 an inline constructor. */
2514 && !(type && TYPE_NEEDS_CONSTRUCTING (type)))
2515 TREE_READONLY (decl) = 1;
2516 if (type_quals & TYPE_QUAL_VOLATILE)
2518 TREE_SIDE_EFFECTS (decl) = 1;
2519 TREE_THIS_VOLATILE (decl) = 1;
2521 if (type_quals & TYPE_QUAL_RESTRICT)
2523 while (type && TREE_CODE (type) == ARRAY_TYPE)
2524 /* Allow 'restrict' on arrays of pointers.
2525 FIXME currently we just ignore it. */
2526 type = TREE_TYPE (type);
2528 || !POINTER_TYPE_P (type)
2529 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type)))
2530 error ("invalid use of %<restrict%>");
2531 else if (flag_strict_aliasing && type == TREE_TYPE (decl))
2532 /* Indicate we need to make a unique alias set for this pointer.
2533 We can't do it here because it might be pointing to an
2535 DECL_POINTER_ALIAS_SET (decl) = -2;
2539 /* Hash function for the problem of multiple type definitions in
2540 different files. This must hash all types that will compare
2541 equal via comptypes to the same value. In practice it hashes
2542 on some of the simple stuff and leaves the details to comptypes. */
2545 c_type_hash (const void *p)
2551 switch (TREE_CODE (t))
2553 /* For pointers, hash on pointee type plus some swizzling. */
2555 return c_type_hash (TREE_TYPE (t)) ^ 0x3003003;
2556 /* Hash on number of elements and total size. */
2559 t2 = TYPE_VALUES (t);
2563 t2 = TYPE_FIELDS (t);
2565 case QUAL_UNION_TYPE:
2567 t2 = TYPE_FIELDS (t);
2571 t2 = TYPE_FIELDS (t);
2576 for (; t2; t2 = TREE_CHAIN (t2))
2578 size = TREE_INT_CST_LOW (TYPE_SIZE (t));
2579 return ((size << 24) | (i << shift));
2582 static GTY((param_is (union tree_node))) htab_t type_hash_table;
2584 /* Return the typed-based alias set for T, which may be an expression
2585 or a type. Return -1 if we don't do anything special. */
2588 c_common_get_alias_set (tree t)
2593 /* Permit type-punning when accessing a union, provided the access
2594 is directly through the union. For example, this code does not
2595 permit taking the address of a union member and then storing
2596 through it. Even the type-punning allowed here is a GCC
2597 extension, albeit a common and useful one; the C standard says
2598 that such accesses have implementation-defined behavior. */
2600 TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF;
2601 u = TREE_OPERAND (u, 0))
2602 if (TREE_CODE (u) == COMPONENT_REF
2603 && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE)
2606 /* That's all the expressions we handle specially. */
2610 /* The C standard guarantees that any object may be accessed via an
2611 lvalue that has character type. */
2612 if (t == char_type_node
2613 || t == signed_char_type_node
2614 || t == unsigned_char_type_node)
2617 /* If it has the may_alias attribute, it can alias anything. */
2618 if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (t)))
2621 /* The C standard specifically allows aliasing between signed and
2622 unsigned variants of the same type. We treat the signed
2623 variant as canonical. */
2624 if (TREE_CODE (t) == INTEGER_TYPE && TYPE_UNSIGNED (t))
2626 tree t1 = c_common_signed_type (t);
2628 /* t1 == t can happen for boolean nodes which are always unsigned. */
2630 return get_alias_set (t1);
2632 else if (POINTER_TYPE_P (t))
2636 /* Unfortunately, there is no canonical form of a pointer type.
2637 In particular, if we have `typedef int I', then `int *', and
2638 `I *' are different types. So, we have to pick a canonical
2639 representative. We do this below.
2641 Technically, this approach is actually more conservative that
2642 it needs to be. In particular, `const int *' and `int *'
2643 should be in different alias sets, according to the C and C++
2644 standard, since their types are not the same, and so,
2645 technically, an `int **' and `const int **' cannot point at
2648 But, the standard is wrong. In particular, this code is
2653 const int* const* cipp = ipp;
2655 And, it doesn't make sense for that to be legal unless you
2656 can dereference IPP and CIPP. So, we ignore cv-qualifiers on
2657 the pointed-to types. This issue has been reported to the
2659 t1 = build_type_no_quals (t);
2661 return get_alias_set (t1);
2664 /* Handle the case of multiple type nodes referring to "the same" type,
2665 which occurs with IMA. These share an alias set. FIXME: Currently only
2666 C90 is handled. (In C99 type compatibility is not transitive, which
2667 complicates things mightily. The alias set splay trees can theoretically
2668 represent this, but insertion is tricky when you consider all the
2669 different orders things might arrive in.) */
2671 if (c_language != clk_c || flag_isoc99)
2674 /* Save time if there's only one input file. */
2675 if (num_in_fnames == 1)
2678 /* Pointers need special handling if they point to any type that
2679 needs special handling (below). */
2680 if (TREE_CODE (t) == POINTER_TYPE)
2683 /* Find bottom type under any nested POINTERs. */
2684 for (t2 = TREE_TYPE (t);
2685 TREE_CODE (t2) == POINTER_TYPE;
2686 t2 = TREE_TYPE (t2))
2688 if (TREE_CODE (t2) != RECORD_TYPE
2689 && TREE_CODE (t2) != ENUMERAL_TYPE
2690 && TREE_CODE (t2) != QUAL_UNION_TYPE
2691 && TREE_CODE (t2) != UNION_TYPE)
2693 if (TYPE_SIZE (t2) == 0)
2696 /* These are the only cases that need special handling. */
2697 if (TREE_CODE (t) != RECORD_TYPE
2698 && TREE_CODE (t) != ENUMERAL_TYPE
2699 && TREE_CODE (t) != QUAL_UNION_TYPE
2700 && TREE_CODE (t) != UNION_TYPE
2701 && TREE_CODE (t) != POINTER_TYPE)
2704 if (TYPE_SIZE (t) == 0)
2707 /* Look up t in hash table. Only one of the compatible types within each
2708 alias set is recorded in the table. */
2709 if (!type_hash_table)
2710 type_hash_table = htab_create_ggc (1021, c_type_hash,
2711 (htab_eq) lang_hooks.types_compatible_p,
2713 slot = htab_find_slot (type_hash_table, t, INSERT);
2716 TYPE_ALIAS_SET (t) = TYPE_ALIAS_SET ((tree)*slot);
2717 return TYPE_ALIAS_SET ((tree)*slot);
2720 /* Our caller will assign and record (in t) a new alias set; all we need
2721 to do is remember t in the hash table. */
2727 /* Compute the value of 'sizeof (TYPE)' or '__alignof__ (TYPE)', where the
2728 second parameter indicates which OPERATOR is being applied. The COMPLAIN
2729 flag controls whether we should diagnose possibly ill-formed
2730 constructs or not. */
2732 c_sizeof_or_alignof_type (tree type, enum tree_code op, int complain)
2734 const char *op_name;
2736 enum tree_code type_code = TREE_CODE (type);
2738 gcc_assert (op == SIZEOF_EXPR || op == ALIGNOF_EXPR);
2739 op_name = op == SIZEOF_EXPR ? "sizeof" : "__alignof__";
2741 if (type_code == FUNCTION_TYPE)
2743 if (op == SIZEOF_EXPR)
2745 if (complain && (pedantic || warn_pointer_arith))
2746 pedwarn ("invalid application of %<sizeof%> to a function type");
2747 value = size_one_node;
2750 value = size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT);
2752 else if (type_code == VOID_TYPE || type_code == ERROR_MARK)
2754 if (type_code == VOID_TYPE
2755 && complain && (pedantic || warn_pointer_arith))
2756 pedwarn ("invalid application of %qs to a void type", op_name);
2757 value = size_one_node;
2759 else if (!COMPLETE_TYPE_P (type))
2762 error ("invalid application of %qs to incomplete type %qT ",
2764 value = size_zero_node;
2768 if (op == (enum tree_code) SIZEOF_EXPR)
2769 /* Convert in case a char is more than one unit. */
2770 value = size_binop (CEIL_DIV_EXPR, TYPE_SIZE_UNIT (type),
2771 size_int (TYPE_PRECISION (char_type_node)
2774 value = size_int (TYPE_ALIGN_UNIT (type));
2777 /* VALUE will have an integer type with TYPE_IS_SIZETYPE set.
2778 TYPE_IS_SIZETYPE means that certain things (like overflow) will
2779 never happen. However, this node should really have type
2780 `size_t', which is just a typedef for an ordinary integer type. */
2781 value = fold (build1 (NOP_EXPR, size_type_node, value));
2782 gcc_assert (!TYPE_IS_SIZETYPE (TREE_TYPE (value)));
2787 /* Implement the __alignof keyword: Return the minimum required
2788 alignment of EXPR, measured in bytes. For VAR_DECL's and
2789 FIELD_DECL's return DECL_ALIGN (which can be set from an
2790 "aligned" __attribute__ specification). */
2793 c_alignof_expr (tree expr)
2797 if (TREE_CODE (expr) == VAR_DECL)
2798 t = size_int (DECL_ALIGN_UNIT (expr));
2800 else if (TREE_CODE (expr) == COMPONENT_REF
2801 && DECL_C_BIT_FIELD (TREE_OPERAND (expr, 1)))
2803 error ("%<__alignof%> applied to a bit-field");
2806 else if (TREE_CODE (expr) == COMPONENT_REF
2807 && TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL)
2808 t = size_int (DECL_ALIGN_UNIT (TREE_OPERAND (expr, 1)));
2810 else if (TREE_CODE (expr) == INDIRECT_REF)
2812 tree t = TREE_OPERAND (expr, 0);
2814 int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
2816 while (TREE_CODE (t) == NOP_EXPR
2817 && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE)
2821 t = TREE_OPERAND (t, 0);
2822 thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
2823 if (thisalign > bestalign)
2824 best = t, bestalign = thisalign;
2826 return c_alignof (TREE_TYPE (TREE_TYPE (best)));
2829 return c_alignof (TREE_TYPE (expr));
2831 return fold (build1 (NOP_EXPR, size_type_node, t));
2834 /* Handle C and C++ default attributes. */
2836 enum built_in_attribute
2838 #define DEF_ATTR_NULL_TREE(ENUM) ENUM,
2839 #define DEF_ATTR_INT(ENUM, VALUE) ENUM,
2840 #define DEF_ATTR_IDENT(ENUM, STRING) ENUM,
2841 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM,
2842 #include "builtin-attrs.def"
2843 #undef DEF_ATTR_NULL_TREE
2845 #undef DEF_ATTR_IDENT
2846 #undef DEF_ATTR_TREE_LIST
2850 static GTY(()) tree built_in_attributes[(int) ATTR_LAST];
2852 static void c_init_attributes (void);
2854 /* Build tree nodes and builtin functions common to both C and C++ language
2858 c_common_nodes_and_builtins (void)
2862 #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME,
2863 #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME,
2864 #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME,
2865 #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME,
2866 #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
2867 #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
2868 #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME,
2869 #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME,
2870 #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME,
2871 #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
2872 #define DEF_POINTER_TYPE(NAME, TYPE) NAME,
2873 #include "builtin-types.def"
2874 #undef DEF_PRIMITIVE_TYPE
2875 #undef DEF_FUNCTION_TYPE_0
2876 #undef DEF_FUNCTION_TYPE_1
2877 #undef DEF_FUNCTION_TYPE_2
2878 #undef DEF_FUNCTION_TYPE_3
2879 #undef DEF_FUNCTION_TYPE_4
2880 #undef DEF_FUNCTION_TYPE_VAR_0
2881 #undef DEF_FUNCTION_TYPE_VAR_1
2882 #undef DEF_FUNCTION_TYPE_VAR_2
2883 #undef DEF_FUNCTION_TYPE_VAR_3
2884 #undef DEF_POINTER_TYPE
2888 typedef enum builtin_type builtin_type;
2890 tree builtin_types[(int) BT_LAST];
2891 int wchar_type_size;
2892 tree array_domain_type;
2893 tree va_list_ref_type_node;
2894 tree va_list_arg_type_node;
2896 /* Define `int' and `char' first so that dbx will output them first. */
2897 record_builtin_type (RID_INT, NULL, integer_type_node);
2898 record_builtin_type (RID_CHAR, "char", char_type_node);
2900 /* `signed' is the same as `int'. FIXME: the declarations of "signed",
2901 "unsigned long", "long long unsigned" and "unsigned short" were in C++
2902 but not C. Are the conditionals here needed? */
2903 if (c_dialect_cxx ())
2904 record_builtin_type (RID_SIGNED, NULL, integer_type_node);
2905 record_builtin_type (RID_LONG, "long int", long_integer_type_node);
2906 record_builtin_type (RID_UNSIGNED, "unsigned int", unsigned_type_node);
2907 record_builtin_type (RID_MAX, "long unsigned int",
2908 long_unsigned_type_node);
2909 if (c_dialect_cxx ())
2910 record_builtin_type (RID_MAX, "unsigned long", long_unsigned_type_node);
2911 record_builtin_type (RID_MAX, "long long int",
2912 long_long_integer_type_node);
2913 record_builtin_type (RID_MAX, "long long unsigned int",
2914 long_long_unsigned_type_node);
2915 if (c_dialect_cxx ())
2916 record_builtin_type (RID_MAX, "long long unsigned",
2917 long_long_unsigned_type_node);
2918 record_builtin_type (RID_SHORT, "short int", short_integer_type_node);
2919 record_builtin_type (RID_MAX, "short unsigned int",
2920 short_unsigned_type_node);
2921 if (c_dialect_cxx ())
2922 record_builtin_type (RID_MAX, "unsigned short",
2923 short_unsigned_type_node);
2925 /* Define both `signed char' and `unsigned char'. */
2926 record_builtin_type (RID_MAX, "signed char", signed_char_type_node);
2927 record_builtin_type (RID_MAX, "unsigned char", unsigned_char_type_node);
2929 /* These are types that c_common_type_for_size and
2930 c_common_type_for_mode use. */
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 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2939 #if HOST_BITS_PER_WIDE_INT >= 64
2940 if (targetm.scalar_mode_supported_p (TImode))
2941 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL,
2942 get_identifier ("__int128_t"),
2945 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2946 unsigned_intQI_type_node));
2947 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2948 unsigned_intHI_type_node));
2949 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2950 unsigned_intSI_type_node));
2951 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2952 unsigned_intDI_type_node));
2953 #if HOST_BITS_PER_WIDE_INT >= 64
2954 if (targetm.scalar_mode_supported_p (TImode))
2955 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL,
2956 get_identifier ("__uint128_t"),
2957 unsigned_intTI_type_node));
2960 /* Create the widest literal types. */
2961 widest_integer_literal_type_node
2962 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
2963 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2964 widest_integer_literal_type_node));
2966 widest_unsigned_literal_type_node
2967 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
2968 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL, NULL_TREE,
2969 widest_unsigned_literal_type_node));
2971 /* `unsigned long' is the standard type for sizeof.
2972 Note that stddef.h uses `unsigned long',
2973 and this must agree, even if long and int are the same size. */
2975 TREE_TYPE (identifier_global_value (get_identifier (SIZE_TYPE)));
2976 signed_size_type_node = c_common_signed_type (size_type_node);
2977 set_sizetype (size_type_node);
2980 TREE_TYPE (identifier_global_value (get_identifier (PID_TYPE)));
2982 build_common_tree_nodes_2 (flag_short_double);
2984 record_builtin_type (RID_FLOAT, NULL, float_type_node);
2985 record_builtin_type (RID_DOUBLE, NULL, double_type_node);
2986 record_builtin_type (RID_MAX, "long double", long_double_type_node);
2988 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL,
2989 get_identifier ("complex int"),
2990 complex_integer_type_node));
2991 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL,
2992 get_identifier ("complex float"),
2993 complex_float_type_node));
2994 lang_hooks.decls.pushdecl (build_decl (TYPE_DECL,
2995 get_identifier ("complex double"),
2996 complex_double_type_node));
2997 lang_hooks.decls.pushdecl
2998 (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2999 complex_long_double_type_node));
3001 if (c_dialect_cxx ())
3002 /* For C++, make fileptr_type_node a distinct void * type until
3003 FILE type is defined. */
3004 fileptr_type_node = build_variant_type_copy (ptr_type_node);
3006 record_builtin_type (RID_VOID, NULL, void_type_node);
3008 /* This node must not be shared. */
3009 void_zero_node = make_node (INTEGER_CST);
3010 TREE_TYPE (void_zero_node) = void_type_node;
3012 void_list_node = build_void_list_node ();
3014 /* Make a type to be the domain of a few array types
3015 whose domains don't really matter.
3016 200 is small enough that it always fits in size_t
3017 and large enough that it can hold most function names for the
3018 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3019 array_domain_type = build_index_type (size_int (200));
3021 /* Make a type for arrays of characters.
3022 With luck nothing will ever really depend on the length of this
3024 char_array_type_node
3025 = build_array_type (char_type_node, array_domain_type);
3027 /* Likewise for arrays of ints. */
3029 = build_array_type (integer_type_node, array_domain_type);
3031 string_type_node = build_pointer_type (char_type_node);
3032 const_string_type_node
3033 = build_pointer_type (build_qualified_type
3034 (char_type_node, TYPE_QUAL_CONST));
3036 /* This is special for C++ so functions can be overloaded. */
3037 wchar_type_node = get_identifier (MODIFIED_WCHAR_TYPE);
3038 wchar_type_node = TREE_TYPE (identifier_global_value (wchar_type_node));
3039 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3040 if (c_dialect_cxx ())
3042 if (TYPE_UNSIGNED (wchar_type_node))
3043 wchar_type_node = make_unsigned_type (wchar_type_size);
3045 wchar_type_node = make_signed_type (wchar_type_size);
3046 record_builtin_type (RID_WCHAR, "wchar_t", wchar_type_node);
3050 signed_wchar_type_node = c_common_signed_type (wchar_type_node);
3051 unsigned_wchar_type_node = c_common_unsigned_type (wchar_type_node);
3054 /* This is for wide string constants. */
3055 wchar_array_type_node
3056 = build_array_type (wchar_type_node, array_domain_type);
3059 TREE_TYPE (identifier_global_value (get_identifier (WINT_TYPE)));
3062 TREE_TYPE (identifier_global_value (get_identifier (INTMAX_TYPE)));
3064 TREE_TYPE (identifier_global_value (get_identifier (UINTMAX_TYPE)));
3066 default_function_type = build_function_type (integer_type_node, NULL_TREE);
3068 = TREE_TYPE (identifier_global_value (get_identifier (PTRDIFF_TYPE)));
3069 unsigned_ptrdiff_type_node = c_common_unsigned_type (ptrdiff_type_node);
3071 lang_hooks.decls.pushdecl
3072 (build_decl (TYPE_DECL, get_identifier ("__builtin_va_list"),
3073 va_list_type_node));
3075 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
3077 va_list_arg_type_node = va_list_ref_type_node =
3078 build_pointer_type (TREE_TYPE (va_list_type_node));
3082 va_list_arg_type_node = va_list_type_node;
3083 va_list_ref_type_node = build_reference_type (va_list_type_node);
3086 #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \
3087 builtin_types[(int) ENUM] = VALUE;
3088 #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \
3089 builtin_types[(int) ENUM] \
3090 = build_function_type (builtin_types[(int) RETURN], \
3092 #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \
3093 builtin_types[(int) ENUM] \
3094 = build_function_type (builtin_types[(int) RETURN], \
3095 tree_cons (NULL_TREE, \
3096 builtin_types[(int) ARG1], \
3098 #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \
3099 builtin_types[(int) ENUM] \
3100 = build_function_type \
3101 (builtin_types[(int) RETURN], \
3102 tree_cons (NULL_TREE, \
3103 builtin_types[(int) ARG1], \
3104 tree_cons (NULL_TREE, \
3105 builtin_types[(int) ARG2], \
3107 #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
3108 builtin_types[(int) ENUM] \
3109 = build_function_type \
3110 (builtin_types[(int) RETURN], \
3111 tree_cons (NULL_TREE, \
3112 builtin_types[(int) ARG1], \
3113 tree_cons (NULL_TREE, \
3114 builtin_types[(int) ARG2], \
3115 tree_cons (NULL_TREE, \
3116 builtin_types[(int) ARG3], \
3118 #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \
3119 builtin_types[(int) ENUM] \
3120 = build_function_type \
3121 (builtin_types[(int) RETURN], \
3122 tree_cons (NULL_TREE, \
3123 builtin_types[(int) ARG1], \
3124 tree_cons (NULL_TREE, \
3125 builtin_types[(int) ARG2], \
3128 builtin_types[(int) ARG3], \
3129 tree_cons (NULL_TREE, \
3130 builtin_types[(int) ARG4], \
3131 void_list_node)))));
3132 #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \
3133 builtin_types[(int) ENUM] \
3134 = build_function_type (builtin_types[(int) RETURN], NULL_TREE);
3135 #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \
3136 builtin_types[(int) ENUM] \
3137 = build_function_type (builtin_types[(int) RETURN], \
3138 tree_cons (NULL_TREE, \
3139 builtin_types[(int) ARG1], \
3142 #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \
3143 builtin_types[(int) ENUM] \
3144 = build_function_type \
3145 (builtin_types[(int) RETURN], \
3146 tree_cons (NULL_TREE, \
3147 builtin_types[(int) ARG1], \
3148 tree_cons (NULL_TREE, \
3149 builtin_types[(int) ARG2], \
3152 #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
3153 builtin_types[(int) ENUM] \
3154 = build_function_type \
3155 (builtin_types[(int) RETURN], \
3156 tree_cons (NULL_TREE, \
3157 builtin_types[(int) ARG1], \
3158 tree_cons (NULL_TREE, \
3159 builtin_types[(int) ARG2], \
3160 tree_cons (NULL_TREE, \
3161 builtin_types[(int) ARG3], \
3164 #define DEF_POINTER_TYPE(ENUM, TYPE) \
3165 builtin_types[(int) ENUM] \
3166 = build_pointer_type (builtin_types[(int) TYPE]);
3167 #include "builtin-types.def"
3168 #undef DEF_PRIMITIVE_TYPE
3169 #undef DEF_FUNCTION_TYPE_1
3170 #undef DEF_FUNCTION_TYPE_2
3171 #undef DEF_FUNCTION_TYPE_3
3172 #undef DEF_FUNCTION_TYPE_4
3173 #undef DEF_FUNCTION_TYPE_VAR_0
3174 #undef DEF_FUNCTION_TYPE_VAR_1
3175 #undef DEF_FUNCTION_TYPE_VAR_2
3176 #undef DEF_FUNCTION_TYPE_VAR_3
3177 #undef DEF_POINTER_TYPE
3179 c_init_attributes ();
3181 #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, \
3182 BOTH_P, FALLBACK_P, NONANSI_P, ATTRS, IMPLICIT) \
3187 gcc_assert (!strncmp (NAME, "__builtin_", \
3188 strlen ("__builtin_"))); \
3191 decl = lang_hooks.builtin_function (NAME, builtin_types[TYPE], \
3195 ? (NAME + strlen ("__builtin_")) \
3197 built_in_attributes[(int) ATTRS]); \
3199 decl = builtin_function_2 (NAME, \
3200 NAME + strlen ("__builtin_"), \
3201 builtin_types[TYPE], \
3202 builtin_types[LIBTYPE], \
3207 built_in_attributes[(int) ATTRS]); \
3209 built_in_decls[(int) ENUM] = decl; \
3211 implicit_built_in_decls[(int) ENUM] = decl; \
3213 #include "builtins.def"
3216 targetm.init_builtins ();
3220 main_identifier_node = get_identifier ("main");
3224 build_va_arg (tree expr, tree type)
3226 return build1 (VA_ARG_EXPR, type, expr);
3230 /* Linked list of disabled built-in functions. */
3232 typedef struct disabled_builtin
3235 struct disabled_builtin *next;
3237 static disabled_builtin *disabled_builtins = NULL;
3239 static bool builtin_function_disabled_p (const char *);
3241 /* Disable a built-in function specified by -fno-builtin-NAME. If NAME
3242 begins with "__builtin_", give an error. */
3245 disable_builtin_function (const char *name)
3247 if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0)
3248 error ("cannot disable built-in function %qs", name);
3251 disabled_builtin *new_disabled_builtin = XNEW (disabled_builtin);
3252 new_disabled_builtin->name = name;
3253 new_disabled_builtin->next = disabled_builtins;
3254 disabled_builtins = new_disabled_builtin;
3259 /* Return true if the built-in function NAME has been disabled, false
3263 builtin_function_disabled_p (const char *name)
3265 disabled_builtin *p;
3266 for (p = disabled_builtins; p != NULL; p = p->next)
3268 if (strcmp (name, p->name) == 0)
3275 /* Possibly define a builtin function with one or two names. BUILTIN_NAME
3276 is an __builtin_-prefixed name; NAME is the ordinary name; one or both
3277 of these may be NULL (though both being NULL is useless).
3278 BUILTIN_TYPE is the type of the __builtin_-prefixed function;
3279 TYPE is the type of the function with the ordinary name. These
3280 may differ if the ordinary name is declared with a looser type to avoid
3281 conflicts with headers. FUNCTION_CODE and CL are as for
3282 builtin_function. If LIBRARY_NAME_P is nonzero, NAME is passed as
3283 the LIBRARY_NAME parameter to builtin_function when declaring BUILTIN_NAME.
3284 If NONANSI_P is true, the name NAME is treated as a non-ANSI name;
3285 ATTRS is the tree list representing the builtin's function attributes.
3286 Returns the declaration of BUILTIN_NAME, if any, otherwise
3287 the declaration of NAME. Does not declare NAME if flag_no_builtin,
3288 or if NONANSI_P and flag_no_nonansi_builtin. */
3291 builtin_function_2 (const char *builtin_name, const char *name,
3292 tree builtin_type, tree type,
3293 enum built_in_function function_code,
3294 enum built_in_class cl, int library_name_p,
3295 bool nonansi_p, tree attrs)
3297 tree bdecl = NULL_TREE;
3298 tree decl = NULL_TREE;
3300 if (builtin_name != 0)
3301 bdecl = lang_hooks.builtin_function (builtin_name, builtin_type,
3303 library_name_p ? name : NULL, attrs);
3305 if (name != 0 && !flag_no_builtin && !builtin_function_disabled_p (name)
3306 && !(nonansi_p && flag_no_nonansi_builtin))
3307 decl = lang_hooks.builtin_function (name, type, function_code, cl,
3310 return (bdecl != 0 ? bdecl : decl);
3313 /* Nonzero if the type T promotes to int. This is (nearly) the
3314 integral promotions defined in ISO C99 6.3.1.1/2. */
3317 c_promoting_integer_type_p (tree t)
3319 switch (TREE_CODE (t))
3322 return (TYPE_MAIN_VARIANT (t) == char_type_node
3323 || TYPE_MAIN_VARIANT (t) == signed_char_type_node
3324 || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node
3325 || TYPE_MAIN_VARIANT (t) == short_integer_type_node
3326 || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node
3327 || TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node));
3330 /* ??? Technically all enumerations not larger than an int
3331 promote to an int. But this is used along code paths
3332 that only want to notice a size change. */
3333 return TYPE_PRECISION (t) < TYPE_PRECISION (integer_type_node);
3343 /* Return 1 if PARMS specifies a fixed number of parameters
3344 and none of their types is affected by default promotions. */
3347 self_promoting_args_p (tree parms)
3350 for (t = parms; t; t = TREE_CHAIN (t))
3352 tree type = TREE_VALUE (t);
3354 if (TREE_CHAIN (t) == 0 && type != void_type_node)
3360 if (TYPE_MAIN_VARIANT (type) == float_type_node)
3363 if (c_promoting_integer_type_p (type))
3369 /* Recursively examines the array elements of TYPE, until a non-array
3370 element type is found. */
3373 strip_array_types (tree type)
3375 while (TREE_CODE (type) == ARRAY_TYPE)
3376 type = TREE_TYPE (type);
3381 /* Recursively remove any '*' or '&' operator from TYPE. */
3383 strip_pointer_operator (tree t)
3385 while (POINTER_TYPE_P (t))
3390 /* Used to compare case labels. K1 and K2 are actually tree nodes
3391 representing case labels, or NULL_TREE for a `default' label.
3392 Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after
3393 K2, and 0 if K1 and K2 are equal. */
3396 case_compare (splay_tree_key k1, splay_tree_key k2)
3398 /* Consider a NULL key (such as arises with a `default' label) to be
3399 smaller than anything else. */
3405 return tree_int_cst_compare ((tree) k1, (tree) k2);
3408 /* Process a case label for the range LOW_VALUE ... HIGH_VALUE. If
3409 LOW_VALUE and HIGH_VALUE are both NULL_TREE then this case label is
3410 actually a `default' label. If only HIGH_VALUE is NULL_TREE, then
3411 case label was declared using the usual C/C++ syntax, rather than
3412 the GNU case range extension. CASES is a tree containing all the
3413 case ranges processed so far; COND is the condition for the
3414 switch-statement itself. Returns the CASE_LABEL_EXPR created, or
3415 ERROR_MARK_NODE if no CASE_LABEL_EXPR is created. */
3418 c_add_case_label (splay_tree cases, tree cond, tree orig_type,
3419 tree low_value, tree high_value)
3424 splay_tree_node node;
3426 /* Create the LABEL_DECL itself. */
3427 label = create_artificial_label ();
3429 /* If there was an error processing the switch condition, bail now
3430 before we get more confused. */
3431 if (!cond || cond == error_mark_node)
3434 if ((low_value && TREE_TYPE (low_value)
3435 && POINTER_TYPE_P (TREE_TYPE (low_value)))
3436 || (high_value && TREE_TYPE (high_value)
3437 && POINTER_TYPE_P (TREE_TYPE (high_value))))
3438 error ("pointers are not permitted as case values");
3440 /* Case ranges are a GNU extension. */
3441 if (high_value && pedantic)
3442 pedwarn ("range expressions in switch statements are non-standard");
3444 type = TREE_TYPE (cond);
3447 low_value = check_case_value (low_value);
3448 low_value = convert_and_check (type, low_value);
3452 high_value = check_case_value (high_value);
3453 high_value = convert_and_check (type, high_value);
3456 /* If an error has occurred, bail out now. */
3457 if (low_value == error_mark_node || high_value == error_mark_node)
3460 /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't
3461 really a case range, even though it was written that way. Remove
3462 the HIGH_VALUE to simplify later processing. */
3463 if (tree_int_cst_equal (low_value, high_value))
3464 high_value = NULL_TREE;
3465 if (low_value && high_value
3466 && !tree_int_cst_lt (low_value, high_value))
3467 warning ("empty range specified");
3469 /* See if the case is in range of the type of the original testing
3470 expression. If both low_value and high_value are out of range,
3471 don't insert the case label and return NULL_TREE. */
3473 && !check_case_bounds (type, orig_type,
3474 &low_value, high_value ? &high_value : NULL))
3477 /* Look up the LOW_VALUE in the table of case labels we already
3479 node = splay_tree_lookup (cases, (splay_tree_key) low_value);
3480 /* If there was not an exact match, check for overlapping ranges.
3481 There's no need to do this if there's no LOW_VALUE or HIGH_VALUE;
3482 that's a `default' label and the only overlap is an exact match. */
3483 if (!node && (low_value || high_value))
3485 splay_tree_node low_bound;
3486 splay_tree_node high_bound;
3488 /* Even though there wasn't an exact match, there might be an
3489 overlap between this case range and another case range.
3490 Since we've (inductively) not allowed any overlapping case
3491 ranges, we simply need to find the greatest low case label
3492 that is smaller that LOW_VALUE, and the smallest low case
3493 label that is greater than LOW_VALUE. If there is an overlap
3494 it will occur in one of these two ranges. */
3495 low_bound = splay_tree_predecessor (cases,
3496 (splay_tree_key) low_value);
3497 high_bound = splay_tree_successor (cases,
3498 (splay_tree_key) low_value);
3500 /* Check to see if the LOW_BOUND overlaps. It is smaller than
3501 the LOW_VALUE, so there is no need to check unless the
3502 LOW_BOUND is in fact itself a case range. */
3504 && CASE_HIGH ((tree) low_bound->value)
3505 && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value),
3508 /* Check to see if the HIGH_BOUND overlaps. The low end of that
3509 range is bigger than the low end of the current range, so we
3510 are only interested if the current range is a real range, and
3511 not an ordinary case label. */
3514 && (tree_int_cst_compare ((tree) high_bound->key,
3519 /* If there was an overlap, issue an error. */
3522 tree duplicate = CASE_LABEL ((tree) node->value);
3526 error ("duplicate (or overlapping) case value");
3527 error ("%Jthis is the first entry overlapping that value", duplicate);
3531 error ("duplicate case value") ;
3532 error ("%Jpreviously used here", duplicate);
3536 error ("multiple default labels in one switch");
3537 error ("%Jthis is the first default label", duplicate);
3542 /* Add a CASE_LABEL to the statement-tree. */
3543 case_label = add_stmt (build_case_label (low_value, high_value, label));
3544 /* Register this case label in the splay tree. */
3545 splay_tree_insert (cases,
3546 (splay_tree_key) low_value,
3547 (splay_tree_value) case_label);
3552 /* Add a label so that the back-end doesn't think that the beginning of
3553 the switch is unreachable. Note that we do not add a case label, as
3554 that just leads to duplicates and thence to aborts later on. */
3557 tree t = create_artificial_label ();
3558 add_stmt (build_stmt (LABEL_EXPR, t));
3560 return error_mark_node;
3563 /* Subroutines of c_do_switch_warnings, called via splay_tree_foreach.
3564 Used to verify that case values match up with enumerator values. */
3567 match_case_to_enum_1 (tree key, tree type, tree label)
3569 char buf[2 + 2*HOST_BITS_PER_WIDE_INT/4 + 1];
3571 /* ??? Not working too hard to print the double-word value.
3572 Should perhaps be done with %lwd in the diagnostic routines? */
3573 if (TREE_INT_CST_HIGH (key) == 0)
3574 snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_UNSIGNED,
3575 TREE_INT_CST_LOW (key));
3576 else if (!TYPE_UNSIGNED (type)
3577 && TREE_INT_CST_HIGH (key) == -1
3578 && TREE_INT_CST_LOW (key) != 0)
3579 snprintf (buf, sizeof (buf), "-" HOST_WIDE_INT_PRINT_UNSIGNED,
3580 -TREE_INT_CST_LOW (key));
3582 snprintf (buf, sizeof (buf), HOST_WIDE_INT_PRINT_DOUBLE_HEX,
3583 TREE_INT_CST_HIGH (key), TREE_INT_CST_LOW (key));
3585 if (TYPE_NAME (type) == 0)
3586 warning ("%Jcase value %qs not in enumerated type",
3587 CASE_LABEL (label), buf);
3589 warning ("%Jcase value %qs not in enumerated type %qT",
3590 CASE_LABEL (label), buf, type);
3594 match_case_to_enum (splay_tree_node node, void *data)
3596 tree label = (tree) node->value;
3597 tree type = (tree) data;
3599 /* Skip default case. */
3600 if (!CASE_LOW (label))
3603 /* If TREE_ADDRESSABLE is not set, that means CASE_LOW did not appear
3604 when we did our enum->case scan. Reset our scratch bit after. */
3605 if (!TREE_ADDRESSABLE (label))
3606 match_case_to_enum_1 (CASE_LOW (label), type, label);
3608 TREE_ADDRESSABLE (label) = 0;
3610 /* If CASE_HIGH is non-null, we have a range. Here we must search.
3611 Note that the old code in stmt.c did not check for the values in
3612 the range either, just the endpoints. */
3613 if (CASE_HIGH (label))
3615 tree chain, key = CASE_HIGH (label);
3617 for (chain = TYPE_VALUES (type);
3618 chain && !tree_int_cst_equal (key, TREE_VALUE (chain));
3619 chain = TREE_CHAIN (chain))
3622 match_case_to_enum_1 (key, type, label);
3628 /* Handle -Wswitch*. Called from the front end after parsing the switch
3630 /* ??? Should probably be somewhere generic, since other languages besides
3631 C and C++ would want this. We'd want to agree on the datastructure,
3632 however, which is a problem. Alternately, we operate on gimplified
3633 switch_exprs, which I don't especially like. At the moment, however,
3634 C/C++ are the only tree-ssa languages that support enumerations at all,
3635 so the point is moot. */
3638 c_do_switch_warnings (splay_tree cases, tree switch_stmt)
3640 splay_tree_node default_node;
3641 location_t switch_location;
3644 if (!warn_switch && !warn_switch_enum && !warn_switch_default)
3647 if (EXPR_HAS_LOCATION (switch_stmt))
3648 switch_location = EXPR_LOCATION (switch_stmt);
3650 switch_location = input_location;
3652 type = SWITCH_TYPE (switch_stmt);
3654 default_node = splay_tree_lookup (cases, (splay_tree_key) NULL);
3655 if (warn_switch_default && !default_node)
3656 warning ("%Hswitch missing default case", &switch_location);
3658 /* If the switch expression was an enumerated type, check that
3659 exactly all enumeration literals are covered by the cases.
3660 The check is made when -Wswitch was specified and there is no
3661 default case, or when -Wswitch-enum was specified. */
3662 if (((warn_switch && !default_node) || warn_switch_enum)
3663 && type && TREE_CODE (type) == ENUMERAL_TYPE
3664 && TREE_CODE (SWITCH_COND (switch_stmt)) != INTEGER_CST)
3668 /* The time complexity here is O(N*lg(N)) worst case, but for the
3669 common case of monotonically increasing enumerators, it is
3670 O(N), since the nature of the splay tree will keep the next
3671 element adjacent to the root at all times. */
3673 for (chain = TYPE_VALUES (type); chain; chain = TREE_CHAIN (chain))
3675 splay_tree_node node
3676 = splay_tree_lookup (cases, (splay_tree_key) TREE_VALUE (chain));
3680 /* Mark the CASE_LOW part of the case entry as seen, so
3681 that we save time later. Choose TREE_ADDRESSABLE
3682 randomly as a bit that won't have been set to-date. */
3683 tree label = (tree) node->value;
3684 TREE_ADDRESSABLE (label) = 1;
3688 /* Warn if there are enumerators that don't correspond to
3689 case expressions. */
3690 warning ("%Henumeration value %qE not handled in switch",
3691 &switch_location, TREE_PURPOSE (chain));
3695 /* Warn if there are case expressions that don't correspond to
3696 enumerators. This can occur since C and C++ don't enforce
3697 type-checking of assignments to enumeration variables.
3699 The time complexity here is O(N**2) worst case, since we've
3700 not sorted the enumeration values. However, in the absence
3701 of case ranges this is O(N), since all single cases that
3702 corresponded to enumerations have been marked above. */
3704 splay_tree_foreach (cases, match_case_to_enum, type);
3708 /* Finish an expression taking the address of LABEL (an
3709 IDENTIFIER_NODE). Returns an expression for the address. */
3712 finish_label_address_expr (tree label)
3717 pedwarn ("taking the address of a label is non-standard");
3719 if (label == error_mark_node)
3720 return error_mark_node;
3722 label = lookup_label (label);
3723 if (label == NULL_TREE)
3724 result = null_pointer_node;
3727 TREE_USED (label) = 1;
3728 result = build1 (ADDR_EXPR, ptr_type_node, label);
3729 /* The current function in not necessarily uninlinable.
3730 Computed gotos are incompatible with inlining, but the value
3731 here could be used only in a diagnostic, for example. */
3737 /* Hook used by expand_expr to expand language-specific tree codes. */
3738 /* The only things that should go here are bits needed to expand
3739 constant initializers. Everything else should be handled by the
3740 gimplification routines. */
3743 c_expand_expr (tree exp, rtx target, enum machine_mode tmode,
3744 int modifier /* Actually enum_modifier. */,
3747 switch (TREE_CODE (exp))
3749 case COMPOUND_LITERAL_EXPR:
3751 /* Initialize the anonymous variable declared in the compound
3752 literal, then return the variable. */
3753 tree decl = COMPOUND_LITERAL_EXPR_DECL (exp);
3754 emit_local_var (decl);
3755 return expand_expr_real (decl, target, tmode, modifier, alt_rtl);
3763 /* Hook used by staticp to handle language-specific tree codes. */
3766 c_staticp (tree exp)
3768 return (TREE_CODE (exp) == COMPOUND_LITERAL_EXPR
3769 && TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (exp))
3774 /* Given a boolean expression ARG, return a tree representing an increment
3775 or decrement (as indicated by CODE) of ARG. The front end must check for
3776 invalid cases (e.g., decrement in C++). */
3778 boolean_increment (enum tree_code code, tree arg)
3781 tree true_res = boolean_true_node;
3783 arg = stabilize_reference (arg);
3786 case PREINCREMENT_EXPR:
3787 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res);
3789 case POSTINCREMENT_EXPR:
3790 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg, true_res);
3791 arg = save_expr (arg);
3792 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg);
3793 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val);
3795 case PREDECREMENT_EXPR:
3796 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg,
3797 invert_truthvalue (arg));
3799 case POSTDECREMENT_EXPR:
3800 val = build2 (MODIFY_EXPR, TREE_TYPE (arg), arg,
3801 invert_truthvalue (arg));
3802 arg = save_expr (arg);
3803 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), val, arg);
3804 val = build2 (COMPOUND_EXPR, TREE_TYPE (arg), arg, val);
3809 TREE_SIDE_EFFECTS (val) = 1;
3813 /* Built-in macros for stddef.h, that require macros defined in this
3816 c_stddef_cpp_builtins(void)
3818 builtin_define_with_value ("__SIZE_TYPE__", SIZE_TYPE, 0);
3819 builtin_define_with_value ("__PTRDIFF_TYPE__", PTRDIFF_TYPE, 0);
3820 builtin_define_with_value ("__WCHAR_TYPE__", MODIFIED_WCHAR_TYPE, 0);
3821 builtin_define_with_value ("__WINT_TYPE__", WINT_TYPE, 0);
3822 builtin_define_with_value ("__INTMAX_TYPE__", INTMAX_TYPE, 0);
3823 builtin_define_with_value ("__UINTMAX_TYPE__", UINTMAX_TYPE, 0);
3827 c_init_attributes (void)
3829 /* Fill in the built_in_attributes array. */
3830 #define DEF_ATTR_NULL_TREE(ENUM) \
3831 built_in_attributes[(int) ENUM] = NULL_TREE;
3832 #define DEF_ATTR_INT(ENUM, VALUE) \
3833 built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE);
3834 #define DEF_ATTR_IDENT(ENUM, STRING) \
3835 built_in_attributes[(int) ENUM] = get_identifier (STRING);
3836 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \
3837 built_in_attributes[(int) ENUM] \
3838 = tree_cons (built_in_attributes[(int) PURPOSE], \
3839 built_in_attributes[(int) VALUE], \
3840 built_in_attributes[(int) CHAIN]);
3841 #include "builtin-attrs.def"
3842 #undef DEF_ATTR_NULL_TREE
3844 #undef DEF_ATTR_IDENT
3845 #undef DEF_ATTR_TREE_LIST
3848 /* Attribute handlers common to C front ends. */
3850 /* Handle a "packed" attribute; arguments as in
3851 struct attribute_spec.handler. */
3854 handle_packed_attribute (tree *node, tree name, tree ARG_UNUSED (args),
3855 int flags, bool *no_add_attrs)
3859 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
3860 *node = build_variant_type_copy (*node);
3861 TYPE_PACKED (*node) = 1;
3862 if (TYPE_MAIN_VARIANT (*node) == *node)
3864 /* If it is the main variant, then pack the other variants
3865 too. This happens in,
3868 struct Foo const *ptr; // creates a variant w/o packed flag
3869 } __ attribute__((packed)); // packs it now.
3873 for (probe = *node; probe; probe = TYPE_NEXT_VARIANT (probe))
3874 TYPE_PACKED (probe) = 1;
3878 else if (TREE_CODE (*node) == FIELD_DECL)
3879 DECL_PACKED (*node) = 1;
3880 /* We can't set DECL_PACKED for a VAR_DECL, because the bit is
3881 used for DECL_REGISTER. It wouldn't mean anything anyway.
3882 We can't set DECL_PACKED on the type of a TYPE_DECL, because
3883 that changes what the typedef is typing. */
3886 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
3887 *no_add_attrs = true;
3893 /* Handle a "nocommon" attribute; arguments as in
3894 struct attribute_spec.handler. */
3897 handle_nocommon_attribute (tree *node, tree name,
3898 tree ARG_UNUSED (args),
3899 int ARG_UNUSED (flags), bool *no_add_attrs)
3901 if (TREE_CODE (*node) == VAR_DECL)
3902 DECL_COMMON (*node) = 0;
3905 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
3906 *no_add_attrs = true;
3912 /* Handle a "common" attribute; arguments as in
3913 struct attribute_spec.handler. */
3916 handle_common_attribute (tree *node, tree name, tree ARG_UNUSED (args),
3917 int ARG_UNUSED (flags), bool *no_add_attrs)
3919 if (TREE_CODE (*node) == VAR_DECL)
3920 DECL_COMMON (*node) = 1;
3923 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
3924 *no_add_attrs = true;
3930 /* Handle a "noreturn" attribute; arguments as in
3931 struct attribute_spec.handler. */
3934 handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args),
3935 int ARG_UNUSED (flags), bool *no_add_attrs)
3937 tree type = TREE_TYPE (*node);
3939 /* See FIXME comment in c_common_attribute_table. */
3940 if (TREE_CODE (*node) == FUNCTION_DECL)
3941 TREE_THIS_VOLATILE (*node) = 1;
3942 else if (TREE_CODE (type) == POINTER_TYPE
3943 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
3945 = build_pointer_type
3946 (build_type_variant (TREE_TYPE (type),
3947 TYPE_READONLY (TREE_TYPE (type)), 1));
3950 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
3951 *no_add_attrs = true;
3957 /* Handle a "noinline" attribute; arguments as in
3958 struct attribute_spec.handler. */
3961 handle_noinline_attribute (tree *node, tree name,
3962 tree ARG_UNUSED (args),
3963 int ARG_UNUSED (flags), bool *no_add_attrs)
3965 if (TREE_CODE (*node) == FUNCTION_DECL)
3966 DECL_UNINLINABLE (*node) = 1;
3969 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
3970 *no_add_attrs = true;
3976 /* Handle a "always_inline" attribute; arguments as in
3977 struct attribute_spec.handler. */
3980 handle_always_inline_attribute (tree *node, tree name,
3981 tree ARG_UNUSED (args),
3982 int ARG_UNUSED (flags),
3985 if (TREE_CODE (*node) == FUNCTION_DECL)
3987 /* Do nothing else, just set the attribute. We'll get at
3988 it later with lookup_attribute. */
3992 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
3993 *no_add_attrs = true;
3999 /* Handle a "used" attribute; arguments as in
4000 struct attribute_spec.handler. */
4003 handle_used_attribute (tree *pnode, tree name, tree ARG_UNUSED (args),
4004 int ARG_UNUSED (flags), bool *no_add_attrs)
4008 if (TREE_CODE (node) == FUNCTION_DECL
4009 || (TREE_CODE (node) == VAR_DECL && TREE_STATIC (node)))
4011 TREE_USED (node) = 1;
4012 DECL_PRESERVE_P (node) = 1;
4016 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
4017 *no_add_attrs = true;
4023 /* Handle a "unused" attribute; arguments as in
4024 struct attribute_spec.handler. */
4027 handle_unused_attribute (tree *node, tree name, tree ARG_UNUSED (args),
4028 int flags, bool *no_add_attrs)
4034 if (TREE_CODE (decl) == PARM_DECL
4035 || TREE_CODE (decl) == VAR_DECL
4036 || TREE_CODE (decl) == FUNCTION_DECL
4037 || TREE_CODE (decl) == LABEL_DECL
4038 || TREE_CODE (decl) == TYPE_DECL)
4039 TREE_USED (decl) = 1;
4042 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
4043 *no_add_attrs = true;
4048 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
4049 *node = build_variant_type_copy (*node);
4050 TREE_USED (*node) = 1;
4056 /* Handle a "const" attribute; arguments as in
4057 struct attribute_spec.handler. */
4060 handle_const_attribute (tree *node, tree name, tree ARG_UNUSED (args),
4061 int ARG_UNUSED (flags), bool *no_add_attrs)
4063 tree type = TREE_TYPE (*node);
4065 /* See FIXME comment on noreturn in c_common_attribute_table. */
4066 if (TREE_CODE (*node) == FUNCTION_DECL)
4067 TREE_READONLY (*node) = 1;
4068 else if (TREE_CODE (type) == POINTER_TYPE
4069 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
4071 = build_pointer_type
4072 (build_type_variant (TREE_TYPE (type), 1,
4073 TREE_THIS_VOLATILE (TREE_TYPE (type))));
4076 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
4077 *no_add_attrs = true;
4083 /* Handle a "transparent_union" attribute; arguments as in
4084 struct attribute_spec.handler. */
4087 handle_transparent_union_attribute (tree *node, tree name,
4088 tree ARG_UNUSED (args), int flags,
4091 tree decl = NULL_TREE;
4098 type = &TREE_TYPE (decl);
4099 is_type = TREE_CODE (*node) == TYPE_DECL;
4101 else if (TYPE_P (*node))
4102 type = node, is_type = 1;
4105 && TREE_CODE (*type) == UNION_TYPE
4107 || (TYPE_FIELDS (*type) != 0
4108 && TYPE_MODE (*type) == DECL_MODE (TYPE_FIELDS (*type)))))
4110 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
4111 *type = build_variant_type_copy (*type);
4112 TYPE_TRANSPARENT_UNION (*type) = 1;
4114 else if (decl != 0 && TREE_CODE (decl) == PARM_DECL
4115 && TREE_CODE (*type) == UNION_TYPE
4116 && TYPE_MODE (*type) == DECL_MODE (TYPE_FIELDS (*type)))
4117 DECL_TRANSPARENT_UNION (decl) = 1;
4120 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
4121 *no_add_attrs = true;
4127 /* Handle a "constructor" attribute; arguments as in
4128 struct attribute_spec.handler. */
4131 handle_constructor_attribute (tree *node, tree name,
4132 tree ARG_UNUSED (args),
4133 int ARG_UNUSED (flags),
4137 tree type = TREE_TYPE (decl);
4139 if (TREE_CODE (decl) == FUNCTION_DECL
4140 && TREE_CODE (type) == FUNCTION_TYPE
4141 && decl_function_context (decl) == 0)
4143 DECL_STATIC_CONSTRUCTOR (decl) = 1;
4144 TREE_USED (decl) = 1;
4148 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
4149 *no_add_attrs = true;
4155 /* Handle a "destructor" attribute; arguments as in
4156 struct attribute_spec.handler. */
4159 handle_destructor_attribute (tree *node, tree name,
4160 tree ARG_UNUSED (args),
4161 int ARG_UNUSED (flags),
4165 tree type = TREE_TYPE (decl);
4167 if (TREE_CODE (decl) == FUNCTION_DECL
4168 && TREE_CODE (type) == FUNCTION_TYPE
4169 && decl_function_context (decl) == 0)
4171 DECL_STATIC_DESTRUCTOR (decl) = 1;
4172 TREE_USED (decl) = 1;
4176 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
4177 *no_add_attrs = true;
4183 /* Handle a "mode" attribute; arguments as in
4184 struct attribute_spec.handler. */
4187 handle_mode_attribute (tree *node, tree name, tree args,
4188 int ARG_UNUSED (flags), bool *no_add_attrs)
4192 *no_add_attrs = true;
4194 if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE)
4195 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
4199 const char *p = IDENTIFIER_POINTER (TREE_VALUE (args));
4200 int len = strlen (p);
4201 enum machine_mode mode = VOIDmode;
4205 if (len > 4 && p[0] == '_' && p[1] == '_'
4206 && p[len - 1] == '_' && p[len - 2] == '_')
4208 char *newp = (char *) alloca (len - 1);
4210 strcpy (newp, &p[2]);
4211 newp[len - 4] = '\0';
4215 /* Change this type to have a type with the specified mode.
4216 First check for the special modes. */
4217 if (!strcmp (p, "byte"))
4219 else if (!strcmp (p, "word"))
4221 else if (!strcmp (p, "pointer"))
4224 for (j = 0; j < NUM_MACHINE_MODES; j++)
4225 if (!strcmp (p, GET_MODE_NAME (j)))
4227 mode = (enum machine_mode) j;
4231 if (mode == VOIDmode)
4233 error ("unknown machine mode %qs", p);
4238 switch (GET_MODE_CLASS (mode))
4241 case MODE_PARTIAL_INT:
4243 valid_mode = targetm.scalar_mode_supported_p (mode);
4246 case MODE_COMPLEX_INT:
4247 case MODE_COMPLEX_FLOAT:
4248 valid_mode = targetm.scalar_mode_supported_p (GET_MODE_INNER (mode));
4251 case MODE_VECTOR_INT:
4252 case MODE_VECTOR_FLOAT:
4253 warning ("specifying vector types with __attribute__ ((mode)) "
4255 warning ("use __attribute__ ((vector_size)) instead");
4256 valid_mode = vector_mode_valid_p (mode);
4264 error ("unable to emulate %qs", p);
4268 if (POINTER_TYPE_P (type))
4270 tree (*fn)(tree, enum machine_mode, bool);
4272 if (!targetm.valid_pointer_mode (mode))
4274 error ("invalid pointer mode %qs", p);
4278 if (TREE_CODE (type) == POINTER_TYPE)
4279 fn = build_pointer_type_for_mode;
4281 fn = build_reference_type_for_mode;
4282 typefm = fn (TREE_TYPE (type), mode, false);
4285 typefm = lang_hooks.types.type_for_mode (mode, TYPE_UNSIGNED (type));
4287 if (typefm == NULL_TREE)
4289 error ("no data type for mode %qs", p);
4292 else if (TREE_CODE (type) == ENUMERAL_TYPE)
4294 /* For enumeral types, copy the precision from the integer
4295 type returned above. If not an INTEGER_TYPE, we can't use
4296 this mode for this type. */
4297 if (TREE_CODE (typefm) != INTEGER_TYPE)
4299 error ("cannot use mode %qs for enumeral types", p);
4303 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
4304 type = build_variant_type_copy (type);
4306 /* We cannot use layout_type here, because that will attempt
4307 to re-layout all variants, corrupting our original. */
4308 TYPE_PRECISION (type) = TYPE_PRECISION (typefm);
4309 TYPE_MIN_VALUE (type) = TYPE_MIN_VALUE (typefm);
4310 TYPE_MAX_VALUE (type) = TYPE_MAX_VALUE (typefm);
4311 TYPE_SIZE (type) = TYPE_SIZE (typefm);
4312 TYPE_SIZE_UNIT (type) = TYPE_SIZE_UNIT (typefm);
4313 if (!TYPE_USER_ALIGN (type))
4314 TYPE_ALIGN (type) = TYPE_ALIGN (typefm);
4318 else if (VECTOR_MODE_P (mode)
4319 ? TREE_CODE (type) != TREE_CODE (TREE_TYPE (typefm))
4320 : TREE_CODE (type) != TREE_CODE (typefm))
4322 error ("mode %qs applied to inappropriate type", p);
4332 /* Handle a "section" attribute; arguments as in
4333 struct attribute_spec.handler. */
4336 handle_section_attribute (tree *node, tree ARG_UNUSED (name), tree args,
4337 int ARG_UNUSED (flags), bool *no_add_attrs)
4341 if (targetm.have_named_sections)
4343 user_defined_section_attribute = true;
4345 if ((TREE_CODE (decl) == FUNCTION_DECL
4346 || TREE_CODE (decl) == VAR_DECL)
4347 && TREE_CODE (TREE_VALUE (args)) == STRING_CST)
4349 if (TREE_CODE (decl) == VAR_DECL
4350 && current_function_decl != NULL_TREE
4351 && !TREE_STATIC (decl))
4353 error ("%Jsection attribute cannot be specified for "
4354 "local variables", decl);
4355 *no_add_attrs = true;
4358 /* The decl may have already been given a section attribute
4359 from a previous declaration. Ensure they match. */
4360 else if (DECL_SECTION_NAME (decl) != NULL_TREE
4361 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
4362 TREE_STRING_POINTER (TREE_VALUE (args))) != 0)
4364 error ("%Jsection of %qD conflicts with previous declaration",
4366 *no_add_attrs = true;
4369 DECL_SECTION_NAME (decl) = TREE_VALUE (args);
4373 error ("%Jsection attribute not allowed for %qD", *node, *node);
4374 *no_add_attrs = true;
4379 error ("%Jsection attributes are not supported for this target", *node);
4380 *no_add_attrs = true;
4386 /* Handle a "aligned" attribute; arguments as in
4387 struct attribute_spec.handler. */
4390 handle_aligned_attribute (tree *node, tree ARG_UNUSED (name), tree args,
4391 int flags, bool *no_add_attrs)
4393 tree decl = NULL_TREE;
4396 tree align_expr = (args ? TREE_VALUE (args)
4397 : size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
4403 type = &TREE_TYPE (decl);
4404 is_type = TREE_CODE (*node) == TYPE_DECL;
4406 else if (TYPE_P (*node))
4407 type = node, is_type = 1;
4409 /* Strip any NOPs of any kind. */
4410 while (TREE_CODE (align_expr) == NOP_EXPR
4411 || TREE_CODE (align_expr) == CONVERT_EXPR
4412 || TREE_CODE (align_expr) == NON_LVALUE_EXPR)
4413 align_expr = TREE_OPERAND (align_expr, 0);
4415 if (TREE_CODE (align_expr) != INTEGER_CST)
4417 error ("requested alignment is not a constant");
4418 *no_add_attrs = true;
4420 else if ((i = tree_log2 (align_expr)) == -1)
4422 error ("requested alignment is not a power of 2");
4423 *no_add_attrs = true;
4425 else if (i > HOST_BITS_PER_INT - 2)
4427 error ("requested alignment is too large");
4428 *no_add_attrs = true;
4432 /* If we have a TYPE_DECL, then copy the type, so that we
4433 don't accidentally modify a builtin type. See pushdecl. */
4434 if (decl && TREE_TYPE (decl) != error_mark_node
4435 && DECL_ORIGINAL_TYPE (decl) == NULL_TREE)
4437 tree tt = TREE_TYPE (decl);
4438 *type = build_variant_type_copy (*type);
4439 DECL_ORIGINAL_TYPE (decl) = tt;
4440 TYPE_NAME (*type) = decl;
4441 TREE_USED (*type) = TREE_USED (decl);
4442 TREE_TYPE (decl) = *type;
4444 else if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
4445 *type = build_variant_type_copy (*type);
4447 TYPE_ALIGN (*type) = (1 << i) * BITS_PER_UNIT;
4448 TYPE_USER_ALIGN (*type) = 1;
4450 else if (TREE_CODE (decl) != VAR_DECL
4451 && TREE_CODE (decl) != FIELD_DECL)
4453 error ("%Jalignment may not be specified for %qD", decl, decl);
4454 *no_add_attrs = true;
4458 DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT;
4459 DECL_USER_ALIGN (decl) = 1;
4465 /* Handle a "weak" attribute; arguments as in
4466 struct attribute_spec.handler. */
4469 handle_weak_attribute (tree *node, tree ARG_UNUSED (name),
4470 tree ARG_UNUSED (args),
4471 int ARG_UNUSED (flags),
4472 bool * ARG_UNUSED (no_add_attrs))
4474 declare_weak (*node);
4479 /* Handle an "alias" attribute; arguments as in
4480 struct attribute_spec.handler. */
4483 handle_alias_attribute (tree *node, tree name, tree args,
4484 int ARG_UNUSED (flags), bool *no_add_attrs)
4488 if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
4489 || (TREE_CODE (decl) != FUNCTION_DECL && !DECL_EXTERNAL (decl)))
4491 error ("%J%qD defined both normally and as an alias", decl, decl);
4492 *no_add_attrs = true;
4495 /* Note that the very first time we process a nested declaration,
4496 decl_function_context will not be set. Indeed, *would* never
4497 be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that
4498 we do below. After such frobbery, pushdecl would set the context.
4499 In any case, this is never what we want. */
4500 else if (decl_function_context (decl) == 0 && current_function_decl == NULL)
4504 id = TREE_VALUE (args);
4505 if (TREE_CODE (id) != STRING_CST)
4507 error ("alias argument not a string");
4508 *no_add_attrs = true;
4511 id = get_identifier (TREE_STRING_POINTER (id));
4512 /* This counts as a use of the object pointed to. */
4515 if (TREE_CODE (decl) == FUNCTION_DECL)
4516 DECL_INITIAL (decl) = error_mark_node;
4519 DECL_EXTERNAL (decl) = 0;
4520 TREE_STATIC (decl) = 1;
4525 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
4526 *no_add_attrs = true;
4532 /* Handle an "visibility" attribute; arguments as in
4533 struct attribute_spec.handler. */
4536 handle_visibility_attribute (tree *node, tree name, tree args,
4537 int ARG_UNUSED (flags),
4541 tree id = TREE_VALUE (args);
4543 *no_add_attrs = true;
4547 if (TREE_CODE (*node) != RECORD_TYPE && TREE_CODE (*node) != UNION_TYPE)
4549 warning ("%qs attribute ignored on non-class types",
4550 IDENTIFIER_POINTER (name));
4554 else if (decl_function_context (decl) != 0 || !TREE_PUBLIC (decl))
4556 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
4560 if (TREE_CODE (id) != STRING_CST)
4562 error ("visibility argument not a string");
4566 /* If this is a type, set the visibility on the type decl. */
4569 decl = TYPE_NAME (decl);
4572 if (TREE_CODE (decl) == IDENTIFIER_NODE)
4574 warning ("%qE attribute ignored on types",
4580 if (strcmp (TREE_STRING_POINTER (id), "default") == 0)
4581 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
4582 else if (strcmp (TREE_STRING_POINTER (id), "internal") == 0)
4583 DECL_VISIBILITY (decl) = VISIBILITY_INTERNAL;
4584 else if (strcmp (TREE_STRING_POINTER (id), "hidden") == 0)
4585 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
4586 else if (strcmp (TREE_STRING_POINTER (id), "protected") == 0)
4587 DECL_VISIBILITY (decl) = VISIBILITY_PROTECTED;
4589 error ("visibility argument must be one of \"default\", \"hidden\", \"protected\" or \"internal\"");
4590 DECL_VISIBILITY_SPECIFIED (decl) = 1;
4592 /* For decls only, go ahead and attach the attribute to the node as well.
4593 This is needed so we can determine whether we have VISIBILITY_DEFAULT
4594 because the visibility was not specified, or because it was explicitly
4595 overridden from the class visibility. */
4597 *no_add_attrs = false;
4602 /* Determine the ELF symbol visibility for DECL, which is either a
4603 variable or a function. It is an error to use this function if a
4604 definition of DECL is not available in this translation unit.
4605 Returns true if the final visibility has been determined by this
4606 function; false if the caller is free to make additional
4610 c_determine_visibility (tree decl)
4612 gcc_assert (TREE_CODE (decl) == VAR_DECL
4613 || TREE_CODE (decl) == FUNCTION_DECL);
4615 /* If the user explicitly specified the visibility with an
4616 attribute, honor that. DECL_VISIBILITY will have been set during
4617 the processing of the attribute. We check for an explicit
4618 attribute, rather than just checking DECL_VISIBILITY_SPECIFIED,
4619 to distinguish the use of an attribute from the use of a "#pragma
4620 GCC visibility push(...)"; in the latter case we still want other
4621 considerations to be able to overrule the #pragma. */
4622 if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl)))
4625 /* Anything that is exported must have default visibility. */
4626 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
4627 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
4629 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
4630 DECL_VISIBILITY_SPECIFIED (decl) = 1;
4637 /* Handle an "tls_model" attribute; arguments as in
4638 struct attribute_spec.handler. */
4641 handle_tls_model_attribute (tree *node, tree name, tree args,
4642 int ARG_UNUSED (flags), bool *no_add_attrs)
4646 if (!DECL_THREAD_LOCAL (decl))
4648 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
4649 *no_add_attrs = true;
4655 id = TREE_VALUE (args);
4656 if (TREE_CODE (id) != STRING_CST)
4658 error ("tls_model argument not a string");
4659 *no_add_attrs = true;
4662 if (strcmp (TREE_STRING_POINTER (id), "local-exec")
4663 && strcmp (TREE_STRING_POINTER (id), "initial-exec")
4664 && strcmp (TREE_STRING_POINTER (id), "local-dynamic")
4665 && strcmp (TREE_STRING_POINTER (id), "global-dynamic"))
4667 error ("tls_model argument must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\"");
4668 *no_add_attrs = true;
4676 /* Handle a "no_instrument_function" attribute; arguments as in
4677 struct attribute_spec.handler. */
4680 handle_no_instrument_function_attribute (tree *node, tree name,
4681 tree ARG_UNUSED (args),
4682 int ARG_UNUSED (flags),
4687 if (TREE_CODE (decl) != FUNCTION_DECL)
4689 error ("%J%qE attribute applies only to functions", decl, name);
4690 *no_add_attrs = true;
4692 else if (DECL_INITIAL (decl))
4694 error ("%Jcan%'t set %qE attribute after definition", decl, name);
4695 *no_add_attrs = true;
4698 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1;
4703 /* Handle a "malloc" attribute; arguments as in
4704 struct attribute_spec.handler. */
4707 handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args),
4708 int ARG_UNUSED (flags), bool *no_add_attrs)
4710 if (TREE_CODE (*node) == FUNCTION_DECL)
4711 DECL_IS_MALLOC (*node) = 1;
4712 /* ??? TODO: Support types. */
4715 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
4716 *no_add_attrs = true;
4722 /* Handle a "no_limit_stack" attribute; arguments as in
4723 struct attribute_spec.handler. */
4726 handle_no_limit_stack_attribute (tree *node, tree name,
4727 tree ARG_UNUSED (args),
4728 int ARG_UNUSED (flags),
4733 if (TREE_CODE (decl) != FUNCTION_DECL)
4735 error ("%J%qE attribute applies only to functions", decl, name);
4736 *no_add_attrs = true;
4738 else if (DECL_INITIAL (decl))
4740 error ("%Jcan%'t set %qE attribute after definition", decl, name);
4741 *no_add_attrs = true;
4744 DECL_NO_LIMIT_STACK (decl) = 1;
4749 /* Handle a "pure" attribute; arguments as in
4750 struct attribute_spec.handler. */
4753 handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args),
4754 int ARG_UNUSED (flags), bool *no_add_attrs)
4756 if (TREE_CODE (*node) == FUNCTION_DECL)
4757 DECL_IS_PURE (*node) = 1;
4758 /* ??? TODO: Support types. */
4761 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
4762 *no_add_attrs = true;
4768 /* Handle a "deprecated" attribute; arguments as in
4769 struct attribute_spec.handler. */
4772 handle_deprecated_attribute (tree *node, tree name,
4773 tree ARG_UNUSED (args), int flags,
4776 tree type = NULL_TREE;
4778 const char *what = NULL;
4783 type = TREE_TYPE (decl);
4785 if (TREE_CODE (decl) == TYPE_DECL
4786 || TREE_CODE (decl) == PARM_DECL
4787 || TREE_CODE (decl) == VAR_DECL
4788 || TREE_CODE (decl) == FUNCTION_DECL
4789 || TREE_CODE (decl) == FIELD_DECL)
4790 TREE_DEPRECATED (decl) = 1;
4794 else if (TYPE_P (*node))
4796 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
4797 *node = build_variant_type_copy (*node);
4798 TREE_DEPRECATED (*node) = 1;
4806 *no_add_attrs = true;
4807 if (type && TYPE_NAME (type))
4809 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
4810 what = IDENTIFIER_POINTER (TYPE_NAME (*node));
4811 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
4812 && DECL_NAME (TYPE_NAME (type)))
4813 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
4816 warning ("%qs attribute ignored for %qs",
4817 IDENTIFIER_POINTER (name), what);
4819 warning ("%qs attribute ignored",
4820 IDENTIFIER_POINTER (name));
4826 /* Handle a "vector_size" attribute; arguments as in
4827 struct attribute_spec.handler. */
4830 handle_vector_size_attribute (tree *node, tree name, tree args,
4831 int ARG_UNUSED (flags),
4834 unsigned HOST_WIDE_INT vecsize, nunits;
4835 enum machine_mode orig_mode;
4836 tree type = *node, new_type, size;
4838 *no_add_attrs = true;
4840 /* Stripping NON_LVALUE_EXPR allows declarations such as
4841 typedef short v4si __attribute__((vector_size (4 * sizeof(short)))). */
4842 size = TREE_VALUE (args);
4843 if (TREE_CODE (size) == NON_LVALUE_EXPR)
4844 size = TREE_OPERAND (size, 0);
4846 if (!host_integerp (size, 1))
4848 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
4852 /* Get the vector size (in bytes). */
4853 vecsize = tree_low_cst (size, 1);
4855 /* We need to provide for vector pointers, vector arrays, and
4856 functions returning vectors. For example:
4858 __attribute__((vector_size(16))) short *foo;
4860 In this case, the mode is SI, but the type being modified is
4861 HI, so we need to look further. */
4863 while (POINTER_TYPE_P (type)
4864 || TREE_CODE (type) == FUNCTION_TYPE
4865 || TREE_CODE (type) == METHOD_TYPE
4866 || TREE_CODE (type) == ARRAY_TYPE)
4867 type = TREE_TYPE (type);
4869 /* Get the mode of the type being modified. */
4870 orig_mode = TYPE_MODE (type);
4872 if (TREE_CODE (type) == RECORD_TYPE
4873 || (GET_MODE_CLASS (orig_mode) != MODE_FLOAT
4874 && GET_MODE_CLASS (orig_mode) != MODE_INT)
4875 || !host_integerp (TYPE_SIZE_UNIT (type), 1))
4877 error ("invalid vector type for attribute %qs",
4878 IDENTIFIER_POINTER (name));
4882 /* Calculate how many units fit in the vector. */
4883 nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1);
4884 if (nunits & (nunits - 1))
4886 error ("number of components of the vector not a power of two");
4890 new_type = build_vector_type (type, nunits);
4892 /* Build back pointers if needed. */
4893 *node = reconstruct_complex_type (*node, new_type);
4898 /* Handle the "nonnull" attribute. */
4900 handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name),
4901 tree args, int ARG_UNUSED (flags),
4905 unsigned HOST_WIDE_INT attr_arg_num;
4907 /* If no arguments are specified, all pointer arguments should be
4908 non-null. Verify a full prototype is given so that the arguments
4909 will have the correct types when we actually check them later. */
4912 if (!TYPE_ARG_TYPES (type))
4914 error ("nonnull attribute without arguments on a non-prototype");
4915 *no_add_attrs = true;
4920 /* Argument list specified. Verify that each argument number references
4921 a pointer argument. */
4922 for (attr_arg_num = 1; args; args = TREE_CHAIN (args))
4925 unsigned HOST_WIDE_INT arg_num = 0, ck_num;
4927 if (!get_nonnull_operand (TREE_VALUE (args), &arg_num))
4929 error ("nonnull argument has invalid operand number (argument %lu)",
4930 (unsigned long) attr_arg_num);
4931 *no_add_attrs = true;
4935 argument = TYPE_ARG_TYPES (type);
4938 for (ck_num = 1; ; ck_num++)
4940 if (!argument || ck_num == arg_num)
4942 argument = TREE_CHAIN (argument);
4946 || TREE_CODE (TREE_VALUE (argument)) == VOID_TYPE)
4948 error ("nonnull argument with out-of-range operand number (argument %lu, operand %lu)",
4949 (unsigned long) attr_arg_num, (unsigned long) arg_num);
4950 *no_add_attrs = true;
4954 if (TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE)
4956 error ("nonnull argument references non-pointer operand (argument %lu, operand %lu)",
4957 (unsigned long) attr_arg_num, (unsigned long) arg_num);
4958 *no_add_attrs = true;
4967 /* Check the argument list of a function call for null in argument slots
4968 that are marked as requiring a non-null pointer argument. */
4971 check_function_nonnull (tree attrs, tree params)
4973 tree a, args, param;
4976 for (a = attrs; a; a = TREE_CHAIN (a))
4978 if (is_attribute_p ("nonnull", TREE_PURPOSE (a)))
4980 args = TREE_VALUE (a);
4982 /* Walk the argument list. If we encounter an argument number we
4983 should check for non-null, do it. If the attribute has no args,
4984 then every pointer argument is checked (in which case the check
4985 for pointer type is done in check_nonnull_arg). */
4986 for (param = params, param_num = 1; ;
4987 param_num++, param = TREE_CHAIN (param))
4991 if (!args || nonnull_check_p (args, param_num))
4992 check_function_arguments_recurse (check_nonnull_arg, NULL,
5000 /* Check that the Nth argument of a function call (counting backwards
5001 from the end) is a (pointer)0. */
5004 check_function_sentinel (tree attrs, tree params)
5006 tree attr = lookup_attribute ("sentinel", attrs);
5011 warning ("missing sentinel in function call");
5017 if (TREE_VALUE (attr))
5019 tree p = TREE_VALUE (TREE_VALUE (attr));
5021 pos = TREE_INT_CST_LOW (p);
5024 sentinel = end = params;
5026 /* Advance `end' ahead of `sentinel' by `pos' positions. */
5027 while (pos > 0 && TREE_CHAIN (end))
5030 end = TREE_CHAIN (end);
5034 warning ("not enough arguments to fit a sentinel");
5038 /* Now advance both until we find the last parameter. */
5039 while (TREE_CHAIN (end))
5041 end = TREE_CHAIN (end);
5042 sentinel = TREE_CHAIN (sentinel);
5045 /* Validate the sentinel. */
5046 if (!POINTER_TYPE_P (TREE_TYPE (TREE_VALUE (sentinel)))
5047 || !integer_zerop (TREE_VALUE (sentinel)))
5048 warning ("missing sentinel in function call");
5053 /* Helper for check_function_nonnull; given a list of operands which
5054 must be non-null in ARGS, determine if operand PARAM_NUM should be
5058 nonnull_check_p (tree args, unsigned HOST_WIDE_INT param_num)
5060 unsigned HOST_WIDE_INT arg_num = 0;
5062 for (; args; args = TREE_CHAIN (args))
5064 bool found = get_nonnull_operand (TREE_VALUE (args), &arg_num);
5068 if (arg_num == param_num)
5074 /* Check that the function argument PARAM (which is operand number
5075 PARAM_NUM) is non-null. This is called by check_function_nonnull
5076 via check_function_arguments_recurse. */
5079 check_nonnull_arg (void * ARG_UNUSED (ctx), tree param,
5080 unsigned HOST_WIDE_INT param_num)
5082 /* Just skip checking the argument if it's not a pointer. This can
5083 happen if the "nonnull" attribute was given without an operand
5084 list (which means to check every pointer argument). */
5086 if (TREE_CODE (TREE_TYPE (param)) != POINTER_TYPE)
5089 if (integer_zerop (param))
5090 warning ("null argument where non-null required (argument %lu)",
5091 (unsigned long) param_num);
5094 /* Helper for nonnull attribute handling; fetch the operand number
5095 from the attribute argument list. */
5098 get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp)
5100 /* Strip any conversions from the arg number and verify they
5102 while (TREE_CODE (arg_num_expr) == NOP_EXPR
5103 || TREE_CODE (arg_num_expr) == CONVERT_EXPR
5104 || TREE_CODE (arg_num_expr) == NON_LVALUE_EXPR)
5105 arg_num_expr = TREE_OPERAND (arg_num_expr, 0);
5107 if (TREE_CODE (arg_num_expr) != INTEGER_CST
5108 || TREE_INT_CST_HIGH (arg_num_expr) != 0)
5111 *valp = TREE_INT_CST_LOW (arg_num_expr);
5115 /* Handle a "nothrow" attribute; arguments as in
5116 struct attribute_spec.handler. */
5119 handle_nothrow_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5120 int ARG_UNUSED (flags), bool *no_add_attrs)
5122 if (TREE_CODE (*node) == FUNCTION_DECL)
5123 TREE_NOTHROW (*node) = 1;
5124 /* ??? TODO: Support types. */
5127 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
5128 *no_add_attrs = true;
5134 /* Handle a "cleanup" attribute; arguments as in
5135 struct attribute_spec.handler. */
5138 handle_cleanup_attribute (tree *node, tree name, tree args,
5139 int ARG_UNUSED (flags), bool *no_add_attrs)
5142 tree cleanup_id, cleanup_decl;
5144 /* ??? Could perhaps support cleanups on TREE_STATIC, much like we do
5145 for global destructors in C++. This requires infrastructure that
5146 we don't have generically at the moment. It's also not a feature
5147 we'd be missing too much, since we do have attribute constructor. */
5148 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl))
5150 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
5151 *no_add_attrs = true;
5155 /* Verify that the argument is a function in scope. */
5156 /* ??? We could support pointers to functions here as well, if
5157 that was considered desirable. */
5158 cleanup_id = TREE_VALUE (args);
5159 if (TREE_CODE (cleanup_id) != IDENTIFIER_NODE)
5161 error ("cleanup argument not an identifier");
5162 *no_add_attrs = true;
5165 cleanup_decl = lookup_name (cleanup_id);
5166 if (!cleanup_decl || TREE_CODE (cleanup_decl) != FUNCTION_DECL)
5168 error ("cleanup argument not a function");
5169 *no_add_attrs = true;
5173 /* That the function has proper type is checked with the
5174 eventual call to build_function_call. */
5179 /* Handle a "warn_unused_result" attribute. No special handling. */
5182 handle_warn_unused_result_attribute (tree *node, tree name,
5183 tree ARG_UNUSED (args),
5184 int ARG_UNUSED (flags), bool *no_add_attrs)
5186 /* Ignore the attribute for functions not returning any value. */
5187 if (VOID_TYPE_P (TREE_TYPE (*node)))
5189 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
5190 *no_add_attrs = true;
5196 /* Handle a "sentinel" attribute. */
5199 handle_sentinel_attribute (tree *node, tree name, tree args,
5200 int ARG_UNUSED (flags), bool *no_add_attrs)
5202 tree params = TYPE_ARG_TYPES (*node);
5206 warning ("%qs attribute requires prototypes with named arguments",
5207 IDENTIFIER_POINTER (name));
5208 *no_add_attrs = true;
5212 while (TREE_CHAIN (params))
5213 params = TREE_CHAIN (params);
5215 if (VOID_TYPE_P (TREE_VALUE (params)))
5217 warning ("%qs attribute only applies to variadic functions",
5218 IDENTIFIER_POINTER (name));
5219 *no_add_attrs = true;
5225 tree position = TREE_VALUE (args);
5227 STRIP_NOPS (position);
5228 if (TREE_CODE (position) != INTEGER_CST)
5230 warning ("requested position is not an integer constant");
5231 *no_add_attrs = true;
5235 if (tree_int_cst_lt (position, integer_zero_node))
5237 warning ("requested position is less than zero");
5238 *no_add_attrs = true;
5246 /* Check for valid arguments being passed to a function. */
5248 check_function_arguments (tree attrs, tree params)
5250 /* Check for null being passed in a pointer argument that must be
5251 non-null. We also need to do this if format checking is enabled. */
5254 check_function_nonnull (attrs, params);
5256 /* Check for errors in format strings. */
5260 check_function_format (attrs, params);
5261 check_function_sentinel (attrs, params);
5265 /* Generic argument checking recursion routine. PARAM is the argument to
5266 be checked. PARAM_NUM is the number of the argument. CALLBACK is invoked
5267 once the argument is resolved. CTX is context for the callback. */
5269 check_function_arguments_recurse (void (*callback)
5270 (void *, tree, unsigned HOST_WIDE_INT),
5271 void *ctx, tree param,
5272 unsigned HOST_WIDE_INT param_num)
5274 if (TREE_CODE (param) == NOP_EXPR)
5276 /* Strip coercion. */
5277 check_function_arguments_recurse (callback, ctx,
5278 TREE_OPERAND (param, 0), param_num);
5282 if (TREE_CODE (param) == CALL_EXPR)
5284 tree type = TREE_TYPE (TREE_TYPE (TREE_OPERAND (param, 0)));
5286 bool found_format_arg = false;
5288 /* See if this is a call to a known internationalization function
5289 that modifies a format arg. Such a function may have multiple
5290 format_arg attributes (for example, ngettext). */
5292 for (attrs = TYPE_ATTRIBUTES (type);
5294 attrs = TREE_CHAIN (attrs))
5295 if (is_attribute_p ("format_arg", TREE_PURPOSE (attrs)))
5298 tree format_num_expr;
5302 /* Extract the argument number, which was previously checked
5304 format_num_expr = TREE_VALUE (TREE_VALUE (attrs));
5305 while (TREE_CODE (format_num_expr) == NOP_EXPR
5306 || TREE_CODE (format_num_expr) == CONVERT_EXPR
5307 || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
5308 format_num_expr = TREE_OPERAND (format_num_expr, 0);
5310 gcc_assert (TREE_CODE (format_num_expr) == INTEGER_CST
5311 && !TREE_INT_CST_HIGH (format_num_expr));
5313 format_num = TREE_INT_CST_LOW (format_num_expr);
5315 for (inner_args = TREE_OPERAND (param, 1), i = 1;
5317 inner_args = TREE_CHAIN (inner_args), i++)
5318 if (i == format_num)
5320 check_function_arguments_recurse (callback, ctx,
5321 TREE_VALUE (inner_args),
5323 found_format_arg = true;
5328 /* If we found a format_arg attribute and did a recursive check,
5329 we are done with checking this argument. Otherwise, we continue
5330 and this will be considered a non-literal. */
5331 if (found_format_arg)
5335 if (TREE_CODE (param) == COND_EXPR)
5337 /* Check both halves of the conditional expression. */
5338 check_function_arguments_recurse (callback, ctx,
5339 TREE_OPERAND (param, 1), param_num);
5340 check_function_arguments_recurse (callback, ctx,
5341 TREE_OPERAND (param, 2), param_num);
5345 (*callback) (ctx, param, param_num);
5348 /* Function to help qsort sort FIELD_DECLs by name order. */
5351 field_decl_cmp (const void *x_p, const void *y_p)
5353 const tree *const x = (const tree *const) x_p;
5354 const tree *const y = (const tree *const) y_p;
5356 if (DECL_NAME (*x) == DECL_NAME (*y))
5357 /* A nontype is "greater" than a type. */
5358 return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL);
5359 if (DECL_NAME (*x) == NULL_TREE)
5361 if (DECL_NAME (*y) == NULL_TREE)
5363 if (DECL_NAME (*x) < DECL_NAME (*y))
5369 gt_pointer_operator new_value;
5373 /* This routine compares two fields like field_decl_cmp but using the
5374 pointer operator in resort_data. */
5377 resort_field_decl_cmp (const void *x_p, const void *y_p)
5379 const tree *const x = (const tree *const) x_p;
5380 const tree *const y = (const tree *const) y_p;
5382 if (DECL_NAME (*x) == DECL_NAME (*y))
5383 /* A nontype is "greater" than a type. */
5384 return (TREE_CODE (*y) == TYPE_DECL) - (TREE_CODE (*x) == TYPE_DECL);
5385 if (DECL_NAME (*x) == NULL_TREE)
5387 if (DECL_NAME (*y) == NULL_TREE)
5390 tree d1 = DECL_NAME (*x);
5391 tree d2 = DECL_NAME (*y);
5392 resort_data.new_value (&d1, resort_data.cookie);
5393 resort_data.new_value (&d2, resort_data.cookie);
5400 /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */
5403 resort_sorted_fields (void *obj,
5404 void * ARG_UNUSED (orig_obj),
5405 gt_pointer_operator new_value,
5408 struct sorted_fields_type *sf = (struct sorted_fields_type *) obj;
5409 resort_data.new_value = new_value;
5410 resort_data.cookie = cookie;
5411 qsort (&sf->elts[0], sf->len, sizeof (tree),
5412 resort_field_decl_cmp);
5415 /* Subroutine of c_parse_error.
5416 Return the result of concatenating LHS and RHS. RHS is really
5417 a string literal, its first character is indicated by RHS_START and
5418 RHS_SIZE is its length (including the terminating NUL character).
5420 The caller is responsible for deleting the returned pointer. */
5423 catenate_strings (const char *lhs, const char *rhs_start, int rhs_size)
5425 const int lhs_size = strlen (lhs);
5426 char *result = XNEWVEC (char, lhs_size + rhs_size);
5427 strncpy (result, lhs, lhs_size);
5428 strncpy (result + lhs_size, rhs_start, rhs_size);
5432 /* Issue the error given by MSGID, indicating that it occurred before
5433 TOKEN, which had the associated VALUE. */
5436 c_parse_error (const char *msgid, enum cpp_ttype token, tree value)
5438 #define catenate_messages(M1, M2) catenate_strings ((M1), (M2), sizeof (M2))
5440 char *message = NULL;
5442 if (token == CPP_EOF)
5443 message = catenate_messages (msgid, " at end of input");
5444 else if (token == CPP_CHAR || token == CPP_WCHAR)
5446 unsigned int val = TREE_INT_CST_LOW (value);
5447 const char *const ell = (token == CPP_CHAR) ? "" : "L";
5448 if (val <= UCHAR_MAX && ISGRAPH (val))
5449 message = catenate_messages (msgid, " before %s'%c'");
5451 message = catenate_messages (msgid, " before %s'\\x%x'");
5453 error (message, ell, val);
5457 else if (token == CPP_STRING || token == CPP_WSTRING)
5458 message = catenate_messages (msgid, " before string constant");
5459 else if (token == CPP_NUMBER)
5460 message = catenate_messages (msgid, " before numeric constant");
5461 else if (token == CPP_NAME)
5463 message = catenate_messages (msgid, " before %qs");
5464 error (message, IDENTIFIER_POINTER (value));
5468 else if (token < N_TTYPES)
5470 message = catenate_messages (msgid, " before %qs token");
5471 error (message, cpp_type2name (token));
5483 #undef catenate_messages
5486 /* Walk a gimplified function and warn for functions whose return value is
5487 ignored and attribute((warn_unused_result)) is set. This is done before
5488 inlining, so we don't have to worry about that. */
5491 c_warn_unused_result (tree *top_p)
5494 tree_stmt_iterator i;
5497 switch (TREE_CODE (t))
5499 case STATEMENT_LIST:
5500 for (i = tsi_start (*top_p); !tsi_end_p (i); tsi_next (&i))
5501 c_warn_unused_result (tsi_stmt_ptr (i));
5505 c_warn_unused_result (&COND_EXPR_THEN (t));
5506 c_warn_unused_result (&COND_EXPR_ELSE (t));
5509 c_warn_unused_result (&BIND_EXPR_BODY (t));
5511 case TRY_FINALLY_EXPR:
5512 case TRY_CATCH_EXPR:
5513 c_warn_unused_result (&TREE_OPERAND (t, 0));
5514 c_warn_unused_result (&TREE_OPERAND (t, 1));
5517 c_warn_unused_result (&CATCH_BODY (t));
5519 case EH_FILTER_EXPR:
5520 c_warn_unused_result (&EH_FILTER_FAILURE (t));
5527 /* This is a naked call, as opposed to a CALL_EXPR nested inside
5528 a MODIFY_EXPR. All calls whose value is ignored should be
5529 represented like this. Look for the attribute. */
5530 fdecl = get_callee_fndecl (t);
5532 ftype = TREE_TYPE (fdecl);
5535 ftype = TREE_TYPE (TREE_OPERAND (t, 0));
5536 /* Look past pointer-to-function to the function type itself. */
5537 ftype = TREE_TYPE (ftype);
5540 if (lookup_attribute ("warn_unused_result", TYPE_ATTRIBUTES (ftype)))
5543 warning ("%Hignoring return value of %qD, "
5544 "declared with attribute warn_unused_result",
5545 EXPR_LOCUS (t), fdecl);
5547 warning ("%Hignoring return value of function "
5548 "declared with attribute warn_unused_result",
5554 /* Not a container, not a call, or a call whose value is used. */
5559 /* Build the result of __builtin_offsetof. EXPR is a nested sequence of
5560 component references, with an INDIRECT_REF at the bottom; much like
5561 the traditional rendering of offsetof as a macro. Returns the folded
5562 and properly cast result. */
5565 fold_offsetof_1 (tree expr)
5567 enum tree_code code = PLUS_EXPR;
5570 switch (TREE_CODE (expr))
5576 return size_zero_node;
5579 base = fold_offsetof_1 (TREE_OPERAND (expr, 0));
5580 if (base == error_mark_node)
5583 t = TREE_OPERAND (expr, 1);
5584 if (DECL_C_BIT_FIELD (t))
5586 error ("attempt to take address of bit-field structure "
5587 "member %qs", IDENTIFIER_POINTER (DECL_NAME (t)));
5588 return error_mark_node;
5590 off = size_binop (PLUS_EXPR, DECL_FIELD_OFFSET (t),
5591 size_int (tree_low_cst (DECL_FIELD_BIT_OFFSET (t), 1)
5596 base = fold_offsetof_1 (TREE_OPERAND (expr, 0));
5597 if (base == error_mark_node)
5600 t = TREE_OPERAND (expr, 1);
5601 if (TREE_CODE (t) == INTEGER_CST && tree_int_cst_sgn (t) < 0)
5604 t = fold (build1 (NEGATE_EXPR, TREE_TYPE (t), t));
5606 t = convert (sizetype, t);
5607 off = size_binop (MULT_EXPR, TYPE_SIZE_UNIT (TREE_TYPE (expr)), t);
5614 return size_binop (code, base, off);
5618 fold_offsetof (tree expr)
5620 /* Convert back from the internal sizetype to size_t. */
5621 return convert (size_type_node, fold_offsetof_1 (expr));
5624 /* Return nonzero if REF is an lvalue valid for this language;
5625 otherwise, print an error message and return zero. USE says
5626 how the lvalue is being used and so selects the error message. */
5629 lvalue_or_else (tree ref, enum lvalue_use use)
5631 int win = lvalue_p (ref);
5638 error ("invalid lvalue in assignment");
5641 error ("invalid lvalue in increment");
5644 error ("invalid lvalue in decrement");
5647 error ("invalid lvalue in unary %<&%>");
5650 error ("invalid lvalue in asm statement");
5660 #include "gt-c-common.h"