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/* Definitions for CPP library.

   Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,

   2004, 2005, 2007, 2008, 2009

   Free Software Foundation, Inc.

   Written by Per Bothner, 1994-95.

This program 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.

This program 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 this program; see the file COPYING3.  If not see

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

 In other words, you are welcome to use, share and improve this program.

 You are forbidden to forbid anyone else to use, share and improve

 what you give them.   Help stamp out software-hoarding!  */

#ifndef LIBCPP_CPPLIB_H

#define LIBCPP_CPPLIB_H

#include <sys/types.h>

#include "symtab.h"

#include "line-map.h"

typedef struct cpp_reader cpp_reader;

typedef struct cpp_buffer cpp_buffer;

typedef struct cpp_options cpp_options;

typedef struct cpp_token cpp_token;

typedef struct cpp_string cpp_string;

typedef struct cpp_hashnode cpp_hashnode;

typedef struct cpp_macro cpp_macro;

typedef struct cpp_callbacks cpp_callbacks;

typedef struct cpp_dir cpp_dir;

struct answer;

struct _cpp_file;

/* The first three groups, apart from '=', can appear in preprocessor

   expressions (+= and -= are used to indicate unary + and - resp.).

   This allows a lookup table to be implemented in _cpp_parse_expr.

   The first group, to CPP_LAST_EQ, can be immediately followed by an

   '='.  The lexer needs operators ending in '=', like ">>=", to be in

   the same order as their counterparts without the '=', like ">>".

   See the cpp_operator table optab in expr.c if you change the order or

   add or remove anything in the first group.  */

#define TTYPE_TABLE                                                     \

  OP(EQ,                "=")                                            \

  OP(NOT,               "!")                                            \

  OP(GREATER,           ">")    /* compare */                           \

  OP(LESS,              "<")                                            \

  OP(PLUS,              "+")    /* math */                              \

  OP(MINUS,             "-")                                            \

  OP(MULT,              "*")                                            \

  OP(DIV,               "/")                                            \

  OP(MOD,               "%")                                            \

  OP(AND,               "&")    /* bit ops */                           \

  OP(OR,                "|")                                            \

  OP(XOR,               "^")                                            \

  OP(RSHIFT,            ">>")                                           \

  OP(LSHIFT,            "<<")                                           \

                                                                        \

  OP(COMPL,             "~")                                            \

  OP(AND_AND,           "&&")   /* logical */                           \

  OP(OR_OR,             "||")                                           \

  OP(QUERY,             "?")                                            \

  OP(COLON,             ":")                                            \

  OP(COMMA,             ",")    /* grouping */                          \

  OP(OPEN_PAREN,        "(")                                            \

  OP(CLOSE_PAREN,       ")")                                            \

  TK(EOF,               NONE)                                           \

  OP(EQ_EQ,             "==")   /* compare */                           \

  OP(NOT_EQ,            "!=")                                           \

  OP(GREATER_EQ,        ">=")                                           \

  OP(LESS_EQ,           "<=")                                           \

                                                                        \

  /* These two are unary + / - in preprocessor expressions.  */         \

  OP(PLUS_EQ,           "+=")   /* math */                              \

  OP(MINUS_EQ,          "-=")                                           \

                                                                        \

  OP(MULT_EQ,           "*=")                                           \

  OP(DIV_EQ,            "/=")                                           \

  OP(MOD_EQ,            "%=")                                           \

  OP(AND_EQ,            "&=")   /* bit ops */                           \

  OP(OR_EQ,             "|=")                                           \

  OP(XOR_EQ,            "^=")                                           \

  OP(RSHIFT_EQ,         ">>=")                                          \

  OP(LSHIFT_EQ,         "<<=")                                          \

  /* Digraphs together, beginning with CPP_FIRST_DIGRAPH.  */           \

  OP(HASH,              "#")    /* digraphs */                          \

  OP(PASTE,             "##")                                           \

  OP(OPEN_SQUARE,       "[")                                            \

  OP(CLOSE_SQUARE,      "]")                                            \

  OP(OPEN_BRACE,        "{")                                            \

  OP(CLOSE_BRACE,       "}")                                            \

  /* The remainder of the punctuation.  Order is not significant.  */   \

  OP(SEMICOLON,         ";")    /* structure */                         \

  OP(ELLIPSIS,          "...")                                          \

  OP(PLUS_PLUS,         "++")   /* increment */                         \

  OP(MINUS_MINUS,       "--")                                           \

  OP(DEREF,             "->")   /* accessors */                         \

  OP(DOT,               ".")                                            \

  OP(SCOPE,             "::")                                           \

  OP(DEREF_STAR,        "->*")                                          \

  OP(DOT_STAR,          ".*")                                           \

  OP(ATSIGN,            "@")  /* used in Objective-C */                 \

                                                                        \

  TK(NAME,              IDENT)   /* word */                             \

  TK(AT_NAME,           IDENT)   /* @word - Objective-C */              \

  TK(NUMBER,            LITERAL) /* 34_be+ta  */                        \

                                                                        \

  TK(CHAR,              LITERAL) /* 'char' */                           \

  TK(WCHAR,             LITERAL) /* L'char' */                          \

  TK(CHAR16,            LITERAL) /* u'char' */                          \

  TK(CHAR32,            LITERAL) /* U'char' */                          \

  TK(OTHER,             LITERAL) /* stray punctuation */                \

                                                                        \

  TK(STRING,            LITERAL) /* "string" */                         \

  TK(WSTRING,           LITERAL) /* L"string" */                        \

  TK(STRING16,          LITERAL) /* u"string" */                        \

  TK(STRING32,          LITERAL) /* U"string" */                        \

  TK(UTF8STRING,        LITERAL) /* u8"string" */                       \

  TK(OBJC_STRING,       LITERAL) /* @"string" - Objective-C */          \

  TK(HEADER_NAME,       LITERAL) /* <stdio.h> in #include */            \

                                                                        \

  TK(COMMENT,           LITERAL) /* Only if output comments.  */        \

                                 /* SPELL_LITERAL happens to DTRT.  */  \

  TK(MACRO_ARG,         NONE)    /* Macro argument.  */                 \

  TK(PRAGMA,            NONE)    /* Only for deferred pragmas.  */      \

  TK(PRAGMA_EOL,        NONE)    /* End-of-line for deferred pragmas.  */ \

  TK(PADDING,           NONE)    /* Whitespace for -E.  */

#define OP(e, s) CPP_ ## e,

#define TK(e, s) CPP_ ## e,

enum cpp_ttype

{

  TTYPE_TABLE

  N_TTYPES,

  /* Positions in the table.  */

  CPP_LAST_EQ        = CPP_LSHIFT,

  CPP_FIRST_DIGRAPH  = CPP_HASH,

  CPP_LAST_PUNCTUATOR= CPP_ATSIGN,

  CPP_LAST_CPP_OP    = CPP_LESS_EQ

};

#undef OP

#undef TK

/* C language kind, used when calling cpp_create_reader.  */

enum c_lang {CLK_GNUC89 = 0, CLK_GNUC99, CLK_STDC89, CLK_STDC94, CLK_STDC99,

             CLK_GNUCXX, CLK_CXX98, CLK_GNUCXX0X, CLK_CXX0X, CLK_ASM};

/* Payload of a NUMBER, STRING, CHAR or COMMENT token.  */

struct GTY(()) cpp_string {

  unsigned int len;

  const unsigned char *text;

};

/* Flags for the cpp_token structure.  */

#define PREV_WHITE      (1 << 0) /* If whitespace before this token.  */

#define DIGRAPH         (1 << 1) /* If it was a digraph.  */

#define STRINGIFY_ARG   (1 << 2) /* If macro argument to be stringified.  */

#define PASTE_LEFT      (1 << 3) /* If on LHS of a ## operator.  */

#define NAMED_OP        (1 << 4) /* C++ named operators.  */

#define NO_EXPAND       (1 << 5) /* Do not macro-expand this token.  */

#define BOL             (1 << 6) /* Token at beginning of line.  */

#define PURE_ZERO       (1 << 7) /* Single 0 digit, used by the C++ frontend,

                                    set in c-lex.c.  */

#define SP_DIGRAPH      (1 << 8) /* # or ## token was a digraph.  */

#define SP_PREV_WHITE   (1 << 9) /* If whitespace before a ##

                                    operator, or before this token

                                    after a # operator.  */

/* Specify which field, if any, of the cpp_token union is used.  */

enum cpp_token_fld_kind {

  CPP_TOKEN_FLD_NODE,

  CPP_TOKEN_FLD_SOURCE,

  CPP_TOKEN_FLD_STR,

  CPP_TOKEN_FLD_ARG_NO,

  CPP_TOKEN_FLD_TOKEN_NO,

  CPP_TOKEN_FLD_PRAGMA,

  CPP_TOKEN_FLD_NONE

};

/* A macro argument in the cpp_token union.  */

struct GTY(()) cpp_macro_arg {

  /* Argument number.  */

  unsigned int arg_no;

};

/* An identifier in the cpp_token union.  */

struct GTY(()) cpp_identifier {

  /* The canonical (UTF-8) spelling of the identifier.  */

  cpp_hashnode *

    GTY ((nested_ptr (union tree_node,

                "%h ? CPP_HASHNODE (GCC_IDENT_TO_HT_IDENT (%h)) : NULL",

                        "%h ? HT_IDENT_TO_GCC_IDENT (HT_NODE (%h)) : NULL")))

       node;

};

/* A preprocessing token.  This has been carefully packed and should

   occupy 16 bytes on 32-bit hosts and 24 bytes on 64-bit hosts.  */

struct GTY(()) cpp_token {

  source_location src_loc;      /* Location of first char of token.  */

  ENUM_BITFIELD(cpp_ttype) type : CHAR_BIT;  /* token type */

  unsigned short flags;         /* flags - see above */

  union cpp_token_u

  {

    /* An identifier.  */

    struct cpp_identifier GTY ((tag ("CPP_TOKEN_FLD_NODE"))) node;

    /* Inherit padding from this token.  */

    cpp_token * GTY ((tag ("CPP_TOKEN_FLD_SOURCE"))) source;

    /* A string, or number.  */

    struct cpp_string GTY ((tag ("CPP_TOKEN_FLD_STR"))) str;

    /* Argument no. for a CPP_MACRO_ARG.  */

    struct cpp_macro_arg GTY ((tag ("CPP_TOKEN_FLD_ARG_NO"))) macro_arg;

    /* Original token no. for a CPP_PASTE (from a sequence of

       consecutive paste tokens in a macro expansion).  */

    unsigned int GTY ((tag ("CPP_TOKEN_FLD_TOKEN_NO"))) token_no;

    /* Caller-supplied identifier for a CPP_PRAGMA.  */

    unsigned int GTY ((tag ("CPP_TOKEN_FLD_PRAGMA"))) pragma;

  } GTY ((desc ("cpp_token_val_index (&%1)"))) val;

};

/* Say which field is in use.  */

extern enum cpp_token_fld_kind cpp_token_val_index (cpp_token *tok);

/* A type wide enough to hold any multibyte source character.

   cpplib's character constant interpreter requires an unsigned type.

   Also, a typedef for the signed equivalent.

   The width of this type is capped at 32 bits; there do exist targets

   where wchar_t is 64 bits, but only in a non-default mode, and there

   would be no meaningful interpretation for a wchar_t value greater

   than 2^32 anyway -- the widest wide-character encoding around is

   ISO 10646, which stops at 2^31.  */

#if CHAR_BIT * SIZEOF_INT >= 32

# define CPPCHAR_SIGNED_T int

#elif CHAR_BIT * SIZEOF_LONG >= 32

# define CPPCHAR_SIGNED_T long

#else

# error "Cannot find a least-32-bit signed integer type"

#endif

typedef unsigned CPPCHAR_SIGNED_T cppchar_t;

typedef CPPCHAR_SIGNED_T cppchar_signed_t;

/* Style of header dependencies to generate.  */

enum cpp_deps_style { DEPS_NONE = 0, DEPS_USER, DEPS_SYSTEM };

/* The possible normalization levels, from most restrictive to least.  */

enum cpp_normalize_level {

  /* In NFKC.  */

  normalized_KC = 0,

  /* In NFC.  */

  normalized_C,

  /* In NFC, except for subsequences where being in NFC would make

     the identifier invalid.  */

  normalized_identifier_C,

  /* Not normalized at all.  */

  normalized_none

};

/* This structure is nested inside struct cpp_reader, and

   carries all the options visible to the command line.  */

struct cpp_options

{

  /* Characters between tab stops.  */

  unsigned int tabstop;

  /* The language we're preprocessing.  */

  enum c_lang lang;

  /* Nonzero means use extra default include directories for C++.  */

  unsigned char cplusplus;

  /* Nonzero means handle cplusplus style comments.  */

  unsigned char cplusplus_comments;

  /* Nonzero means define __OBJC__, treat @ as a special token, use

     the OBJC[PLUS]_INCLUDE_PATH environment variable, and allow

     "#import".  */

  unsigned char objc;

  /* Nonzero means don't copy comments into the output file.  */

  unsigned char discard_comments;

  /* Nonzero means don't copy comments into the output file during

     macro expansion.  */

  unsigned char discard_comments_in_macro_exp;

  /* Nonzero means process the ISO trigraph sequences.  */

  unsigned char trigraphs;

  /* Nonzero means process the ISO digraph sequences.  */

  unsigned char digraphs;

  /* Nonzero means to allow hexadecimal floats and LL suffixes.  */

  unsigned char extended_numbers;

  /* Nonzero means process u/U prefix literals (UTF-16/32).  */

  unsigned char uliterals;

  /* Nonzero means print names of header files (-H).  */

  unsigned char print_include_names;

  /* Nonzero means complain about deprecated features.  */

  unsigned char warn_deprecated;

  /* Nonzero means warn if slash-star appears in a comment.  */

  unsigned char warn_comments;

  /* Nonzero means warn if a user-supplied include directory does not

     exist.  */

  unsigned char warn_missing_include_dirs;

  /* Nonzero means warn if there are any trigraphs.  */

  unsigned char warn_trigraphs;

  /* Nonzero means warn about multicharacter charconsts.  */

  unsigned char warn_multichar;

  /* Nonzero means warn about various incompatibilities with

     traditional C.  */

  unsigned char warn_traditional;

  /* Nonzero means warn about long long numeric constants.  */

  unsigned char warn_long_long;

  /* Nonzero means warn about text after an #endif (or #else).  */

  unsigned char warn_endif_labels;

  /* Nonzero means warn about implicit sign changes owing to integer

     promotions.  */

  unsigned char warn_num_sign_change;

  /* Zero means don't warn about __VA_ARGS__ usage in c89 pedantic mode.

     Presumably the usage is protected by the appropriate #ifdef.  */

  unsigned char warn_variadic_macros;

  /* Nonzero means warn about builtin macros that are redefined or

     explicitly undefined.  */

  unsigned char warn_builtin_macro_redefined;

  /* Nonzero means we should look for header.gcc files that remap file

     names.  */

  unsigned char remap;

  /* Zero means dollar signs are punctuation.  */

  unsigned char dollars_in_ident;

  /* Nonzero means UCNs are accepted in identifiers.  */

  unsigned char extended_identifiers;

  /* True if we should warn about dollars in identifiers or numbers

     for this translation unit.  */

  unsigned char warn_dollars;

  /* Nonzero means warn if undefined identifiers are evaluated in an #if.  */

  unsigned char warn_undef;

  /* Nonzero means warn of unused macros from the main file.  */

  unsigned char warn_unused_macros;

  /* Nonzero for the 1999 C Standard, including corrigenda and amendments.  */

  unsigned char c99;

  /* Nonzero if we are conforming to a specific C or C++ standard.  */

  unsigned char std;

  /* Nonzero means give all the error messages the ANSI standard requires.  */

  unsigned char pedantic;

  /* Nonzero means we're looking at already preprocessed code, so don't

     bother trying to do macro expansion and whatnot.  */

  unsigned char preprocessed;

  /* Print column number in error messages.  */

  unsigned char show_column;

  /* Nonzero means handle C++ alternate operator names.  */

  unsigned char operator_names;

  /* Nonzero means warn about use of C++ alternate operator names.  */

  unsigned char warn_cxx_operator_names;

  /* True for traditional preprocessing.  */

  unsigned char traditional;

  /* Holds the name of the target (execution) character set.  */

  const char *narrow_charset;

  /* Holds the name of the target wide character set.  */

  const char *wide_charset;

  /* Holds the name of the input character set.  */

  const char *input_charset;

  /* The minimum permitted level of normalization before a warning

     is generated.  */

  enum cpp_normalize_level warn_normalize;

  /* True to warn about precompiled header files we couldn't use.  */

  bool warn_invalid_pch;

  /* True if dependencies should be restored from a precompiled header.  */

  bool restore_pch_deps;

  /* Dependency generation.  */

  struct

  {

    /* Style of header dependencies to generate.  */

    enum cpp_deps_style style;

    /* Assume missing files are generated files.  */

    bool missing_files;

    /* Generate phony targets for each dependency apart from the first

       one.  */

    bool phony_targets;

    /* If true, no dependency is generated on the main file.  */

    bool ignore_main_file;

    /* If true, intend to use the preprocessor output (e.g., for compilation)

       in addition to the dependency info.  */

    bool need_preprocessor_output;

  } deps;

  /* Target-specific features set by the front end or client.  */

  /* Precision for target CPP arithmetic, target characters, target

     ints and target wide characters, respectively.  */

  size_t precision, char_precision, int_precision, wchar_precision;

  /* True means chars (wide chars) are unsigned.  */

  bool unsigned_char, unsigned_wchar;

  /* True if the most significant byte in a word has the lowest

     address in memory.  */

  bool bytes_big_endian;

  /* Nonzero means __STDC__ should have the value 0 in system headers.  */

  unsigned char stdc_0_in_system_headers;

  /* True disables tokenization outside of preprocessing directives. */

  bool directives_only;

};

/* Callback for header lookup for HEADER, which is the name of a

   source file.  It is used as a method of last resort to find headers

   that are not otherwise found during the normal include processing.

   The return value is the malloced name of a header to try and open,

   if any, or NULL otherwise.  This callback is called only if the

   header is otherwise unfound.  */

typedef const char *(*missing_header_cb)(cpp_reader *, const char *header, cpp_dir **);

/* Call backs to cpplib client.  */

struct cpp_callbacks

{

  /* Called when a new line of preprocessed output is started.  */

  void (*line_change) (cpp_reader *, const cpp_token *, int);

  /* Called when switching to/from a new file.

     The line_map is for the new file.  It is NULL if there is no new file.

     (In C this happens when done with <built-in>+<command line> and also

     when done with a main file.)  This can be used for resource cleanup.  */

  void (*file_change) (cpp_reader *, const struct line_map *);

  void (*dir_change) (cpp_reader *, const char *);

  void (*include) (cpp_reader *, unsigned int, const unsigned char *,

                   const char *, int, const cpp_token **);

  void (*define) (cpp_reader *, unsigned int, cpp_hashnode *);

  void (*undef) (cpp_reader *, unsigned int, cpp_hashnode *);

  void (*ident) (cpp_reader *, unsigned int, const cpp_string *);

  void (*def_pragma) (cpp_reader *, unsigned int);

  int (*valid_pch) (cpp_reader *, const char *, int);

  void (*read_pch) (cpp_reader *, const char *, int, const char *);

  missing_header_cb missing_header;

  /* Context-sensitive macro support.  Returns macro (if any) that should

     be expanded.  */

  cpp_hashnode * (*macro_to_expand) (cpp_reader *, const cpp_token *);

  /* Called to emit a diagnostic.  This callback receives the

     translated message.  */

  bool (*error) (cpp_reader *, int, source_location, unsigned int,

                 const char *, va_list *)

       ATTRIBUTE_FPTR_PRINTF(5,0);

  /* Callbacks for when a macro is expanded, or tested (whether

     defined or not at the time) in #ifdef, #ifndef or "defined".  */

  void (*used_define) (cpp_reader *, unsigned int, cpp_hashnode *);

  void (*used_undef) (cpp_reader *, unsigned int, cpp_hashnode *);

  /* Called before #define and #undef or other macro definition

     changes are processed.  */

  void (*before_define) (cpp_reader *);

  /* Called whenever a macro is expanded or tested.

     Second argument is the location of the start of the current expansion.  */

  void (*used) (cpp_reader *, source_location, cpp_hashnode *);

};

#ifdef VMS

#define INO_T_CPP ino_t ino[3]

#else

#define INO_T_CPP ino_t ino

#endif

/* Chain of directories to look for include files in.  */

struct cpp_dir

{

  /* NULL-terminated singly-linked list.  */

  struct cpp_dir *next;

  /* NAME of the directory, NUL-terminated.  */

  char *name;

  unsigned int len;

  /* One if a system header, two if a system header that has extern

     "C" guards for C++.  */

  unsigned char sysp;

  /* Is this a user-supplied directory? */

  bool user_supplied_p;

  /* The canonicalized NAME as determined by lrealpath.  This field

     is only used by hosts that lack reliable inode numbers.  */

  char *canonical_name;

  /* Mapping of file names for this directory for MS-DOS and related

     platforms.  A NULL-terminated array of (from, to) pairs.  */

  const char **name_map;

  /* Routine to construct pathname, given the search path name and the

     HEADER we are trying to find, return a constructed pathname to

     try and open.  If this is NULL, the constructed pathname is as

     constructed by append_file_to_dir.  */

  char *(*construct) (const char *header, cpp_dir *dir);

  /* The C front end uses these to recognize duplicated

     directories in the search path.  */

  INO_T_CPP;

  dev_t dev;

};

/* The structure of a node in the hash table.  The hash table has

   entries for all identifiers: either macros defined by #define

   commands (type NT_MACRO), assertions created with #assert

   (NT_ASSERTION), or neither of the above (NT_VOID).  Builtin macros

   like __LINE__ are flagged NODE_BUILTIN.  Poisoned identifiers are

   flagged NODE_POISONED.  NODE_OPERATOR (C++ only) indicates an

   identifier that behaves like an operator such as "xor".

   NODE_DIAGNOSTIC is for speed in lex_token: it indicates a

   diagnostic may be required for this node.  Currently this only

   applies to __VA_ARGS__, poisoned identifiers, and -Wc++-compat

   warnings about NODE_OPERATOR.  */

/* Hash node flags.  */

#define NODE_OPERATOR   (1 << 0)        /* C++ named operator.  */

#define NODE_POISONED   (1 << 1)        /* Poisoned identifier.  */

#define NODE_BUILTIN    (1 << 2)        /* Builtin macro.  */

#define NODE_DIAGNOSTIC (1 << 3)        /* Possible diagnostic when lexed.  */

#define NODE_WARN       (1 << 4)        /* Warn if redefined or undefined.  */

#define NODE_DISABLED   (1 << 5)        /* A disabled macro.  */

#define NODE_MACRO_ARG  (1 << 6)        /* Used during #define processing.  */

#define NODE_USED       (1 << 7)        /* Dumped with -dU.  */

#define NODE_CONDITIONAL (1 << 8)       /* Conditional macro */

#define NODE_WARN_OPERATOR (1 << 9)     /* Warn about C++ named operator.  */

/* Different flavors of hash node.  */

enum node_type

{

  NT_VOID = 0,      /* No definition yet.  */

  NT_MACRO,        /* A macro of some form.  */

  NT_ASSERTION     /* Predicate for #assert.  */

};

/* Different flavors of builtin macro.  _Pragma is an operator, but we

   handle it with the builtin code for efficiency reasons.  */

enum cpp_builtin_type

{

  BT_SPECLINE = 0,               /* `__LINE__' */

  BT_DATE,                      /* `__DATE__' */

  BT_FILE,                      /* `__FILE__' */

  BT_BASE_FILE,                 /* `__BASE_FILE__' */

  BT_INCLUDE_LEVEL,             /* `__INCLUDE_LEVEL__' */

  BT_TIME,                      /* `__TIME__' */

  BT_STDC,                      /* `__STDC__' */

  BT_PRAGMA,                    /* `_Pragma' operator */

  BT_TIMESTAMP,                 /* `__TIMESTAMP__' */

  BT_COUNTER                    /* `__COUNTER__' */

};

#define CPP_HASHNODE(HNODE)     ((cpp_hashnode *) (HNODE))

#define HT_NODE(NODE)           ((ht_identifier *) (NODE))

#define NODE_LEN(NODE)          HT_LEN (&(NODE)->ident)

#define NODE_NAME(NODE)         HT_STR (&(NODE)->ident)

/* Specify which field, if any, of the union is used.  */

enum {

  NTV_MACRO,

  NTV_ANSWER,

  NTV_BUILTIN,

  NTV_ARGUMENT,

  NTV_NONE

};

#define CPP_HASHNODE_VALUE_IDX(HNODE)                           \

  ((HNODE.flags & NODE_MACRO_ARG) ? NTV_ARGUMENT                \

   : HNODE.type == NT_MACRO ? ((HNODE.flags & NODE_BUILTIN)     \

                               ? NTV_BUILTIN : NTV_MACRO)       \

   : HNODE.type == NT_ASSERTION ? NTV_ANSWER                    \

   : NTV_NONE)

/* The common part of an identifier node shared amongst all 3 C front

   ends.  Also used to store CPP identifiers, which are a superset of

   identifiers in the grammatical sense.  */

union GTY(()) _cpp_hashnode_value {

  /* If a macro.  */

  cpp_macro * GTY((tag ("NTV_MACRO"))) macro;

  /* Answers to an assertion.  */

  struct answer * GTY ((tag ("NTV_ANSWER"))) answers;

  /* Code for a builtin macro.  */

  enum cpp_builtin_type GTY ((tag ("NTV_BUILTIN"))) builtin;

  /* Macro argument index.  */

  unsigned short GTY ((tag ("NTV_ARGUMENT"))) arg_index;

};

struct GTY(()) cpp_hashnode {

  struct ht_identifier ident;

  unsigned int is_directive : 1;

  unsigned int directive_index : 7;     /* If is_directive,

                                           then index into directive table.

                                           Otherwise, a NODE_OPERATOR.  */

  unsigned char rid_code;               /* Rid code - for front ends.  */

  ENUM_BITFIELD(node_type) type : 6;    /* CPP node type.  */

  unsigned int flags : 10;              /* CPP flags.  */

  union _cpp_hashnode_value GTY ((desc ("CPP_HASHNODE_VALUE_IDX (%1)"))) value;

};

/* Call this first to get a handle to pass to other functions.

   If you want cpplib to manage its own hashtable, pass in a NULL

   pointer.  Otherwise you should pass in an initialized hash table

   that cpplib will share; this technique is used by the C front

   ends.  */

extern cpp_reader *cpp_create_reader (enum c_lang, struct ht *,

                                      struct line_maps *);

/* Reset the cpp_reader's line_map.  This is only used after reading a

   PCH file.  */

extern void cpp_set_line_map (cpp_reader *, struct line_maps *);

/* Call this to change the selected language standard (e.g. because of

   command line options).  */

extern void cpp_set_lang (cpp_reader *, enum c_lang);

/* Set the include paths.  */

extern void cpp_set_include_chains (cpp_reader *, cpp_dir *, cpp_dir *, int);

/* Call these to get pointers to the options, callback, and deps

   structures for a given reader.  These pointers are good until you

   call cpp_finish on that reader.  You can either edit the callbacks

   through the pointer returned from cpp_get_callbacks, or set them

   with cpp_set_callbacks.  */

extern cpp_options *cpp_get_options (cpp_reader *);

extern cpp_callbacks *cpp_get_callbacks (cpp_reader *);

extern void cpp_set_callbacks (cpp_reader *, cpp_callbacks *);

extern struct deps *cpp_get_deps (cpp_reader *);

/* This function reads the file, but does not start preprocessing.  It

   returns the name of the original file; this is the same as the

   input file, except for preprocessed input.  This will generate at

   least one file change callback, and possibly a line change callback

   too.  If there was an error opening the file, it returns NULL.  */

extern const char *cpp_read_main_file (cpp_reader *, const char *);

/* Set up built-ins with special behavior.  Use cpp_init_builtins()

   instead unless your know what you are doing.  */

extern void cpp_init_special_builtins (cpp_reader *);

/* Set up built-ins like __FILE__.  */

extern void cpp_init_builtins (cpp_reader *, int);

/* This is called after options have been parsed, and partially

   processed.  */

extern void cpp_post_options (cpp_reader *);

/* Set up translation to the target character set.  */

extern void cpp_init_iconv (cpp_reader *);

/* Call this to finish preprocessing.  If you requested dependency

   generation, pass an open stream to write the information to,

   otherwise NULL.  It is your responsibility to close the stream.  */

extern void cpp_finish (cpp_reader *, FILE *deps_stream);

/* Call this to release the handle at the end of preprocessing.  Any

   use of the handle after this function returns is invalid.  */

extern void cpp_destroy (cpp_reader *);

extern unsigned int cpp_token_len (const cpp_token *);

extern unsigned char *cpp_token_as_text (cpp_reader *, const cpp_token *);

extern unsigned char *cpp_spell_token (cpp_reader *, const cpp_token *,

                                       unsigned char *, bool);

extern void cpp_register_pragma (cpp_reader *, const char *, const char *,

                                 void (*) (cpp_reader *), bool);

extern void cpp_register_deferred_pragma (cpp_reader *, const char *,

                                          const char *, unsigned, bool, bool);

extern int cpp_avoid_paste (cpp_reader *, const cpp_token *,

                            const cpp_token *);

extern const cpp_token *cpp_get_token (cpp_reader *);