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/* Definitions for c-common.c.

   Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,

   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009

   Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under

the terms of the GNU General Public License as published by the Free

Software Foundation; either version 3, or (at your option) any later

version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY

WARRANTY; without even the implied warranty of MERCHANTABILITY or

FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

for more details.

You should have received a copy of the GNU General Public License

along with GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

#ifndef GCC_C_COMMON_H

#define GCC_C_COMMON_H

#include "splay-tree.h"

#include "cpplib.h"

#include "ggc.h"

/* Usage of TREE_LANG_FLAG_?:

   0: TREE_NEGATED_INT (in INTEGER_CST).

      IDENTIFIER_MARKED (used by search routines).

      DECL_PRETTY_FUNCTION_P (in VAR_DECL)

      C_MAYBE_CONST_EXPR_INT_OPERANDS (in C_MAYBE_CONST_EXPR, for C)

   1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)

      STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)

      C_MAYBE_CONST_EXPR_NON_CONST (in C_MAYBE_CONST_EXPR, for C)

   2: unused

   3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)

   4: unused

*/

/* Reserved identifiers.  This is the union of all the keywords for C,

   C++, and Objective-C.  All the type modifiers have to be in one

   block at the beginning, because they are used as mask bits.  There

   are 27 type modifiers; if we add many more we will have to redesign

   the mask mechanism.  */

enum rid

{

  /* Modifiers: */

  /* C, in empirical order of frequency.  */

  RID_STATIC = 0,

  RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,

  RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,

  RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,

  /* C extensions */

  RID_COMPLEX, RID_THREAD, RID_SAT,

  /* C++ */

  RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,

  /* ObjC */

  RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,

  /* C (reserved and imaginary types not implemented, so any use is a

     syntax error) */

  RID_IMAGINARY,

  /* C */

  RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,

  RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,

  RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,

  RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,

  RID_SIZEOF,

  /* C extensions */

  RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,

  RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,

  RID_TYPES_COMPATIBLE_P,

  RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,

  RID_FRACT, RID_ACCUM,

  /* This means to warn that this is a C++ keyword, and then treat it

     as a normal identifier.  */

  RID_CXX_COMPAT_WARN,

  /* Too many ways of getting the name of a function as a string */

  RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,

  /* C++ */

  RID_BOOL,     RID_WCHAR,    RID_CLASS,

  RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,

  RID_TEMPLATE, RID_NULL,     RID_CATCH,

  RID_DELETE,   RID_FALSE,    RID_NAMESPACE,

  RID_NEW,      RID_OFFSETOF, RID_OPERATOR,

  RID_THIS,     RID_THROW,    RID_TRUE,

  RID_TRY,      RID_TYPENAME, RID_TYPEID,

  RID_USING,    RID_CHAR16,   RID_CHAR32,

  /* casts */

  RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,

  /* C++ extensions */

  RID_HAS_NOTHROW_ASSIGN,      RID_HAS_NOTHROW_CONSTRUCTOR,

  RID_HAS_NOTHROW_COPY,        RID_HAS_TRIVIAL_ASSIGN,

  RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,

  RID_HAS_TRIVIAL_DESTRUCTOR,  RID_HAS_VIRTUAL_DESTRUCTOR,

  RID_IS_ABSTRACT,             RID_IS_BASE_OF,

  RID_IS_CONVERTIBLE_TO,       RID_IS_CLASS,

  RID_IS_EMPTY,                RID_IS_ENUM,

  RID_IS_POD,                  RID_IS_POLYMORPHIC,

  RID_IS_STD_LAYOUT,           RID_IS_TRIVIAL,

  RID_IS_UNION,

  /* C++0x */

  RID_STATIC_ASSERT, RID_CONSTEXPR, RID_DECLTYPE,

  /* Objective-C */

  RID_AT_ENCODE,   RID_AT_END,

  RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,

  RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,

  RID_AT_PROTOCOL, RID_AT_SELECTOR,

  RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,

  RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,

  RID_AT_INTERFACE,

  RID_AT_IMPLEMENTATION,

  /* Named address support, mapping the keyword to a particular named address

     number.  Named address space 0 is reserved for the generic address.  If

     there are more than 254 named addresses, the addr_space_t type will need

     to be grown from an unsigned char to unsigned short.  */

  RID_ADDR_SPACE_0,             /* generic address */

  RID_ADDR_SPACE_1,

  RID_ADDR_SPACE_2,

  RID_ADDR_SPACE_3,

  RID_ADDR_SPACE_4,

  RID_ADDR_SPACE_5,

  RID_ADDR_SPACE_6,

  RID_ADDR_SPACE_7,

  RID_ADDR_SPACE_8,

  RID_ADDR_SPACE_9,

  RID_ADDR_SPACE_10,

  RID_ADDR_SPACE_11,

  RID_ADDR_SPACE_12,

  RID_ADDR_SPACE_13,

  RID_ADDR_SPACE_14,

  RID_ADDR_SPACE_15,

  RID_FIRST_ADDR_SPACE = RID_ADDR_SPACE_0,

  RID_LAST_ADDR_SPACE = RID_ADDR_SPACE_15,

  RID_MAX,

  RID_FIRST_MODIFIER = RID_STATIC,

  RID_LAST_MODIFIER = RID_ONEWAY,

  RID_FIRST_CXX0X = RID_STATIC_ASSERT,

  RID_LAST_CXX0X = RID_DECLTYPE,

  RID_FIRST_AT = RID_AT_ENCODE,

  RID_LAST_AT = RID_AT_IMPLEMENTATION,

  RID_FIRST_PQ = RID_IN,

  RID_LAST_PQ = RID_ONEWAY

};

#define OBJC_IS_AT_KEYWORD(rid) \

  ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \

   (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)

#define OBJC_IS_PQ_KEYWORD(rid) \

  ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \

   (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)

/* The elements of `ridpointers' are identifier nodes for the reserved

   type names and storage classes.  It is indexed by a RID_... value.  */

extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;

/* Standard named or nameless data types of the C compiler.  */

enum c_tree_index

{

    CTI_CHAR16_TYPE,

    CTI_CHAR32_TYPE,

    CTI_WCHAR_TYPE,

    CTI_UNDERLYING_WCHAR_TYPE,

    CTI_WINT_TYPE,

    CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */

    CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */

    CTI_INTMAX_TYPE,

    CTI_UINTMAX_TYPE,

    CTI_WIDEST_INT_LIT_TYPE,

    CTI_WIDEST_UINT_LIT_TYPE,

    /* Types for <stdint.h>, that may not be defined on all

       targets.  */

    CTI_SIG_ATOMIC_TYPE,

    CTI_INT8_TYPE,

    CTI_INT16_TYPE,

    CTI_INT32_TYPE,

    CTI_INT64_TYPE,

    CTI_UINT8_TYPE,

    CTI_UINT16_TYPE,

    CTI_UINT32_TYPE,

    CTI_UINT64_TYPE,

    CTI_INT_LEAST8_TYPE,

    CTI_INT_LEAST16_TYPE,

    CTI_INT_LEAST32_TYPE,

    CTI_INT_LEAST64_TYPE,

    CTI_UINT_LEAST8_TYPE,

    CTI_UINT_LEAST16_TYPE,

    CTI_UINT_LEAST32_TYPE,

    CTI_UINT_LEAST64_TYPE,

    CTI_INT_FAST8_TYPE,

    CTI_INT_FAST16_TYPE,

    CTI_INT_FAST32_TYPE,

    CTI_INT_FAST64_TYPE,

    CTI_UINT_FAST8_TYPE,

    CTI_UINT_FAST16_TYPE,

    CTI_UINT_FAST32_TYPE,

    CTI_UINT_FAST64_TYPE,

    CTI_INTPTR_TYPE,

    CTI_UINTPTR_TYPE,

    CTI_CHAR_ARRAY_TYPE,

    CTI_CHAR16_ARRAY_TYPE,

    CTI_CHAR32_ARRAY_TYPE,

    CTI_WCHAR_ARRAY_TYPE,

    CTI_INT_ARRAY_TYPE,

    CTI_STRING_TYPE,

    CTI_CONST_STRING_TYPE,

    /* Type for boolean expressions (bool in C++, int in C).  */

    CTI_TRUTHVALUE_TYPE,

    CTI_TRUTHVALUE_TRUE,

    CTI_TRUTHVALUE_FALSE,

    CTI_DEFAULT_FUNCTION_TYPE,

    /* These are not types, but we have to look them up all the time.  */

    CTI_FUNCTION_NAME_DECL,

    CTI_PRETTY_FUNCTION_NAME_DECL,

    CTI_C99_FUNCTION_NAME_DECL,

    CTI_SAVED_FUNCTION_NAME_DECLS,

    CTI_VOID_ZERO,

    CTI_NULL,

    CTI_MAX

};

#define C_CPP_HASHNODE(id) \

  (&(((struct c_common_identifier *) (id))->node))

#define C_RID_CODE(id) \

  ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))

#define C_SET_RID_CODE(id, code) \

  (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)

/* Identifier part common to the C front ends.  Inherits from

   tree_identifier, despite appearances.  */

struct GTY(()) c_common_identifier {

  struct tree_common common;

  struct cpp_hashnode node;

};

/* An entry in the reserved keyword table.  */

struct c_common_resword

{

  const char *const word;

  ENUM_BITFIELD(rid) const rid : 16;

  const unsigned int disable   : 16;

};

/* Disable mask.  Keywords are disabled if (reswords[i].disable &

   mask) is _true_.  Thus for keywords which are present in all

   languages the disable field is zero.  */

#define D_CONLY         0x001   /* C only (not in C++).  */

#define D_CXXONLY       0x002   /* C++ only (not in C).  */

#define D_C99           0x004   /* In C, C99 only.  */

#define D_CXX0X         0x008   /* In C++, C++0X only.  */

#define D_EXT           0x010   /* GCC extension.  */

#define D_EXT89         0x020   /* GCC extension incorporated in C99.  */

#define D_ASM           0x040   /* Disabled by -fno-asm.  */

#define D_OBJC          0x080   /* In Objective C and neither C nor C++.  */

#define D_CXX_OBJC      0x100   /* In Objective C, and C++, but not C.  */

#define D_CXXWARN       0x200   /* In C warn with -Wcxx-compat.  */

/* Macro for backends to define named address keywords.  */

#define ADDR_SPACE_KEYWORD(STRING, VALUE) \

  { STRING, RID_FIRST_ADDR_SPACE + (VALUE), D_CONLY | D_EXT }

/* The reserved keyword table.  */

extern const struct c_common_resword c_common_reswords[];

/* The number of items in the reserved keyword table.  */

extern const unsigned int num_c_common_reswords;

#define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]

#define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]

#define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]

#define underlying_wchar_type_node      c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]

#define wint_type_node                  c_global_trees[CTI_WINT_TYPE]

#define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]

#define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]

#define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]

#define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]

#define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]

#define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]

#define sig_atomic_type_node            c_global_trees[CTI_SIG_ATOMIC_TYPE]

#define int8_type_node                  c_global_trees[CTI_INT8_TYPE]

#define int16_type_node                 c_global_trees[CTI_INT16_TYPE]

#define int32_type_node                 c_global_trees[CTI_INT32_TYPE]

#define int64_type_node                 c_global_trees[CTI_INT64_TYPE]

#define uint8_type_node                 c_global_trees[CTI_UINT8_TYPE]

#define uint16_type_node                c_global_trees[CTI_UINT16_TYPE]

#define c_uint32_type_node              c_global_trees[CTI_UINT32_TYPE]

#define c_uint64_type_node              c_global_trees[CTI_UINT64_TYPE]

#define int_least8_type_node            c_global_trees[CTI_INT_LEAST8_TYPE]

#define int_least16_type_node           c_global_trees[CTI_INT_LEAST16_TYPE]

#define int_least32_type_node           c_global_trees[CTI_INT_LEAST32_TYPE]

#define int_least64_type_node           c_global_trees[CTI_INT_LEAST64_TYPE]

#define uint_least8_type_node           c_global_trees[CTI_UINT_LEAST8_TYPE]

#define uint_least16_type_node          c_global_trees[CTI_UINT_LEAST16_TYPE]

#define uint_least32_type_node          c_global_trees[CTI_UINT_LEAST32_TYPE]

#define uint_least64_type_node          c_global_trees[CTI_UINT_LEAST64_TYPE]

#define int_fast8_type_node             c_global_trees[CTI_INT_FAST8_TYPE]

#define int_fast16_type_node            c_global_trees[CTI_INT_FAST16_TYPE]

#define int_fast32_type_node            c_global_trees[CTI_INT_FAST32_TYPE]

#define int_fast64_type_node            c_global_trees[CTI_INT_FAST64_TYPE]

#define uint_fast8_type_node            c_global_trees[CTI_UINT_FAST8_TYPE]

#define uint_fast16_type_node           c_global_trees[CTI_UINT_FAST16_TYPE]

#define uint_fast32_type_node           c_global_trees[CTI_UINT_FAST32_TYPE]

#define uint_fast64_type_node           c_global_trees[CTI_UINT_FAST64_TYPE]

#define intptr_type_node                c_global_trees[CTI_INTPTR_TYPE]

#define uintptr_type_node               c_global_trees[CTI_UINTPTR_TYPE]

#define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]

#define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]

#define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]

#define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]

#define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]

#define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]

#define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]

#define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]

#define string_type_node                c_global_trees[CTI_STRING_TYPE]

#define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]

#define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]

#define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]

#define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]

#define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]

#define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]

/* A node for `((void) 0)'.  */

#define void_zero_node                  c_global_trees[CTI_VOID_ZERO]

/* The node for C++ `__null'.  */

#define null_node                       c_global_trees[CTI_NULL]

extern GTY(()) tree c_global_trees[CTI_MAX];

/* In a RECORD_TYPE, a sorted array of the fields of the type, not a

   tree for size reasons.  */

struct GTY(()) sorted_fields_type {

  int len;

  tree GTY((length ("%h.len"))) elts[1];

};

/* Mark which labels are explicitly declared.

   These may be shadowed, and may be referenced from nested functions.  */

#define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)

typedef enum c_language_kind

{

  clk_c         = 0,             /* C90, C94 or C99 */

  clk_objc      = 1,            /* clk_c with ObjC features.  */

  clk_cxx       = 2,            /* ANSI/ISO C++ */

  clk_objcxx    = 3             /* clk_cxx with ObjC features.  */

}

c_language_kind;

/* To test for a specific language use c_language, defined by each

   front end.  For "ObjC features" or "not C++" use the macros.  */

extern c_language_kind c_language;

#define c_dialect_cxx()         ((c_language & clk_cxx) != 0)

#define c_dialect_objc()        ((c_language & clk_objc) != 0)

/* The various name of operator that appears in error messages. */

typedef enum ref_operator {

  /* NULL */

  RO_NULL,

  /* array indexing */

  RO_ARRAY_INDEXING,

  /* unary * */

  RO_UNARY_STAR,

  /* -> */

  RO_ARROW,

  /* implicit conversion */

  RO_IMPLICIT_CONVERSION

} ref_operator;

/* Information about a statement tree.  */

struct GTY(()) stmt_tree_s {

  /* The current statement list being collected.  */

  tree x_cur_stmt_list;

  /* In C++, Nonzero if we should treat statements as full

     expressions.  In particular, this variable is no-zero if at the

     end of a statement we should destroy any temporaries created

     during that statement.  Similarly, if, at the end of a block, we

     should destroy any local variables in this block.  Normally, this

     variable is nonzero, since those are the normal semantics of

     C++.

     However, in order to represent aggregate initialization code as

     tree structure, we use statement-expressions.  The statements

     within the statement expression should not result in cleanups

     being run until the entire enclosing statement is complete.

     This flag has no effect in C.  */

  int stmts_are_full_exprs_p;

};

typedef struct stmt_tree_s *stmt_tree;

/* Global state pertinent to the current function.  Some C dialects

   extend this structure with additional fields.  */

struct GTY(()) c_language_function {

  /* While we are parsing the function, this contains information

     about the statement-tree that we are building.  */

  struct stmt_tree_s x_stmt_tree;

};

/* When building a statement-tree, this is the current statement list

   being collected.  It's TREE_CHAIN is a back-pointer to the previous

   statement list.  */

#define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)

/* Language-specific hooks.  */

/* If non-NULL, this function is called after a precompile header file

   is loaded.  */

extern void (*lang_post_pch_load) (void);

extern void push_file_scope (void);

extern void pop_file_scope (void);

extern stmt_tree current_stmt_tree (void);

extern tree push_stmt_list (void);

extern tree pop_stmt_list (tree);

extern tree add_stmt (tree);

extern void push_cleanup (tree, tree, bool);

extern tree pushdecl_top_level (tree);

extern tree pushdecl (tree);

extern tree build_modify_expr (location_t, tree, tree, enum tree_code,

                               location_t, tree, tree);

extern tree build_indirect_ref (location_t, tree, ref_operator);

extern int c_expand_decl (tree);

extern int field_decl_cmp (const void *, const void *);

extern void resort_sorted_fields (void *, void *, gt_pointer_operator,

                                  void *);

extern bool has_c_linkage (const_tree decl);

/* Switches common to the C front ends.  */

/* Nonzero if prepreprocessing only.  */

extern int flag_preprocess_only;

/* Zero means that faster, ...NonNil variants of objc_msgSend...

   calls will be used in ObjC; passing nil receivers to such calls

   will most likely result in crashes.  */

extern int flag_nil_receivers;

/* Nonzero means that we will allow new ObjC exception syntax (@throw,

   @try, etc.) in source code.  */

extern int flag_objc_exceptions;

/* Nonzero means that we generate NeXT setjmp based exceptions.  */

extern int flag_objc_sjlj_exceptions;

/* Nonzero means that code generation will be altered to support

   "zero-link" execution.  This currently affects ObjC only, but may

   affect other languages in the future.  */

extern int flag_zero_link;

/* Nonzero means emit an '__OBJC, __image_info' for the current translation

   unit.  It will inform the ObjC runtime that class definition(s) herein

   contained are to replace one(s) previously loaded.  */

extern int flag_replace_objc_classes;

/* Nonzero means don't output line number information.  */

extern char flag_no_line_commands;

/* Nonzero causes -E output not to be done, but directives such as

   #define that have side effects are still obeyed.  */

extern char flag_no_output;

/* Nonzero means dump macros in some fashion; contains the 'D', 'M',

   'N' or 'U' of the command line switch.  */

extern char flag_dump_macros;

/* Nonzero means pass #include lines through to the output.  */

extern char flag_dump_includes;

/* Nonzero means process PCH files while preprocessing.  */

extern bool flag_pch_preprocess;

/* The file name to which we should write a precompiled header, or

   NULL if no header will be written in this compile.  */

extern const char *pch_file;

/* Nonzero if an ISO standard was selected.  It rejects macros in the

   user's namespace.  */

extern int flag_iso;

/* Nonzero if -undef was given.  It suppresses target built-in macros

   and assertions.  */

extern int flag_undef;

/* Nonzero means don't recognize the non-ANSI builtin functions.  */

extern int flag_no_builtin;

/* Nonzero means don't recognize the non-ANSI builtin functions.

   -ansi sets this.  */

extern int flag_no_nonansi_builtin;

/* Nonzero means give `double' the same size as `float'.  */

extern int flag_short_double;

/* Nonzero means give `wchar_t' the same size as `short'.  */

extern int flag_short_wchar;

/* Nonzero means allow implicit conversions between vectors with

   differing numbers of subparts and/or differing element types.  */

extern int flag_lax_vector_conversions;

/* Nonzero means allow Microsoft extensions without warnings or errors.  */

extern int flag_ms_extensions;

/* Nonzero means don't recognize the keyword `asm'.  */

extern int flag_no_asm;

/* Nonzero means give string constants the type `const char *', as mandated

   by the standard.  */

extern int flag_const_strings;

/* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */

extern int flag_signed_bitfields;

/* Warn about #pragma directives that are not recognized.  */

extern int warn_unknown_pragmas; /* Tri state variable.  */

/* Warn about format/argument anomalies in calls to formatted I/O functions

   (*printf, *scanf, strftime, strfmon, etc.).  */

extern int warn_format;

/* C/ObjC language option variables.  */

/* Nonzero means allow type mismatches in conditional expressions;

   just make their values `void'.  */

extern int flag_cond_mismatch;

/* Nonzero means enable C89 Amendment 1 features.  */

extern int flag_isoc94;

/* Nonzero means use the ISO C99 dialect of C.  */

extern int flag_isoc99;

/* Nonzero means that we have builtin functions, and main is an int.  */

extern int flag_hosted;

/* ObjC language option variables.  */

/* Open and close the file for outputting class declarations, if

   requested (ObjC).  */

extern int flag_gen_declaration;

/* Tells the compiler that this is a special run.  Do not perform any

   compiling, instead we are to test some platform dependent features

   and output a C header file with appropriate definitions.  */

extern int print_struct_values;

/* ???.  Undocumented.  */

extern const char *constant_string_class_name;

/* C++ language option variables.  */

/* Nonzero means don't recognize any extension keywords.  */

extern int flag_no_gnu_keywords;

/* Nonzero means do emit exported implementations of functions even if

   they can be inlined.  */

extern int flag_implement_inlines;

/* Nonzero means that implicit instantiations will be emitted if needed.  */

extern int flag_implicit_templates;

/* Nonzero means that implicit instantiations of inline templates will be

   emitted if needed, even if instantiations of non-inline templates

   aren't.  */

extern int flag_implicit_inline_templates;

/* Nonzero means generate separate instantiation control files and

   juggle them at link time.  */

extern int flag_use_repository;

/* Nonzero if we want to issue diagnostics that the standard says are not

   required.  */

extern int flag_optional_diags;

/* Nonzero means we should attempt to elide constructors when possible.  */

extern int flag_elide_constructors;

/* Nonzero means that member functions defined in class scope are

   inline by default.  */

extern int flag_default_inline;

/* Controls whether compiler generates 'type descriptor' that give

   run-time type information.  */

extern int flag_rtti;

/* Nonzero if we want to conserve space in the .o files.  We do this

   by putting uninitialized data and runtime initialized data into

   .common instead of .data at the expense of not flagging multiple

   definitions.  */

extern int flag_conserve_space;

/* Nonzero if we want to obey access control semantics.  */

extern int flag_access_control;

/* Nonzero if we want to check the return value of new and avoid calling

   constructors if it is a null pointer.  */

extern int flag_check_new;

/* The supported C++ dialects.  */

enum cxx_dialect {

  /* C++98  */

  cxx98,

  /* Experimental features that are likely to become part of

     C++0x.  */

  cxx0x

};

/* The C++ dialect being used. C++98 is the default.  */

extern enum cxx_dialect cxx_dialect;

/* Nonzero if we want the new ISO rules for pushing a new scope for `for'

   initialization variables.

   0: Old rules, set by -fno-for-scope.

   2: New ISO rules, set by -ffor-scope.

   1: Try to implement new ISO rules, but with backup compatibility

   (and warnings).  This is the default, for now.  */

extern int flag_new_for_scope;

/* Nonzero if we want to emit defined symbols with common-like linkage as

   weak symbols where possible, in order to conform to C++ semantics.

   Otherwise, emit them as local symbols.  */

extern int flag_weak;

/* 0 means we want the preprocessor to not emit line directives for

   the current working directory.  1 means we want it to do it.  -1

   means we should decide depending on whether debugging information

   is being emitted or not.  */

extern int flag_working_directory;

/* Nonzero to use __cxa_atexit, rather than atexit, to register

   destructors for local statics and global objects.  */

extern int flag_use_cxa_atexit;

/* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling

   logic.  */

extern int flag_use_cxa_get_exception_ptr;

/* Nonzero means to implement standard semantics for exception

   specifications, calling unexpected if an exception is thrown that

   doesn't match the specification.  Zero means to treat them as

   assertions and optimize accordingly, but not check them.  */

extern int flag_enforce_eh_specs;

/* Nonzero (the default) means to generate thread-safe code for

   initializing local statics.  */

extern int flag_threadsafe_statics;

/* Nonzero if we want to pretty-print template specializations as the

   template signature followed by the arguments.  */

extern int flag_pretty_templates;

/* Nonzero means warn about implicit declarations.  */

extern int warn_implicit;

/* Warn about using __null (as NULL in C++) as sentinel.  For code compiled

   with GCC this doesn't matter as __null is guaranteed to have the right

   size.  */

extern int warn_strict_null_sentinel;

/* Maximum template instantiation depth.  This limit is rather

   arbitrary, but it exists to limit the time it takes to notice

   infinite template instantiations.  */

extern int max_tinst_depth;

/* Nonzero means that we should not issue warnings about problems that

   occur when the code is executed, because the code being processed

   is not expected to be executed.  This is set during parsing.  This

   is used for cases like sizeof() and "0 ? a : b".  This is a count,

   not a bool, because unexecuted expressions can nest.  */

extern int c_inhibit_evaluation_warnings;

/* Whether lexing has been completed, so subsequent preprocessor

   errors should use the compiler's input_location.  */

extern bool done_lexing;

/* C types are partitioned into three subsets: object, function, and

   incomplete types.  */

#define C_TYPE_OBJECT_P(type) \

  (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))

#define C_TYPE_INCOMPLETE_P(type) \

  (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)

#define C_TYPE_FUNCTION_P(type) \

  (TREE_CODE (type) == FUNCTION_TYPE)

/* For convenience we define a single macro to identify the class of

   object or incomplete types.  */

#define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \

  (!C_TYPE_FUNCTION_P (type))

/* Attribute table common to the C front ends.  */

extern const struct attribute_spec c_common_attribute_table[];