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/* Part of CPP library.

   Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007,

   2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.

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/>.  */

/* This header defines all the internal data structures and functions

   that need to be visible across files.  It should not be used outside

   cpplib.  */

#ifndef LIBCPP_INTERNAL_H

#define LIBCPP_INTERNAL_H

#include "symtab.h"

#include "cpp-id-data.h"

#if HAVE_ICONV

#include <iconv.h>

#else

#define HAVE_ICONV 0

typedef int iconv_t;  /* dummy */

#endif

#ifdef __cplusplus

extern "C" {

#endif

struct directive;               /* Deliberately incomplete.  */

struct pending_option;

struct op;

struct _cpp_strbuf;

typedef bool (*convert_f) (iconv_t, const unsigned char *, size_t,

                           struct _cpp_strbuf *);

struct cset_converter

{

  convert_f func;

  iconv_t cd;

  int width;

};

#define BITS_PER_CPPCHAR_T (CHAR_BIT * sizeof (cppchar_t))

/* Test if a sign is valid within a preprocessing number.  */

#define VALID_SIGN(c, prevc) \

  (((c) == '+' || (c) == '-') && \

   ((prevc) == 'e' || (prevc) == 'E' \

    || (((prevc) == 'p' || (prevc) == 'P') \

        && CPP_OPTION (pfile, extended_numbers))))

#define CPP_OPTION(PFILE, OPTION) ((PFILE)->opts.OPTION)

#define CPP_BUFFER(PFILE) ((PFILE)->buffer)

#define CPP_BUF_COLUMN(BUF, CUR) ((CUR) - (BUF)->line_base)

#define CPP_BUF_COL(BUF) CPP_BUF_COLUMN(BUF, (BUF)->cur)

#define CPP_INCREMENT_LINE(PFILE, COLS_HINT) do { \

    const struct line_maps *line_table = PFILE->line_table; \

    const struct line_map *map = \

      LINEMAPS_LAST_ORDINARY_MAP (line_table); \

    linenum_type line = SOURCE_LINE (map, line_table->highest_line); \

    linemap_line_start (PFILE->line_table, line + 1, COLS_HINT); \

  } while (0)

/* Maximum nesting of cpp_buffers.  We use a static limit, partly for

   efficiency, and partly to limit runaway recursion.  */

#define CPP_STACK_MAX 200

/* Host alignment handling.  */

struct dummy

{

  char c;

  union

  {

    double d;

    int *p;

  } u;

};

#define DEFAULT_ALIGNMENT offsetof (struct dummy, u)

#define CPP_ALIGN2(size, align) (((size) + ((align) - 1)) & ~((align) - 1))

#define CPP_ALIGN(size) CPP_ALIGN2 (size, DEFAULT_ALIGNMENT)

#define _cpp_mark_macro_used(NODE) do {                                 \

  if ((NODE)->type == NT_MACRO && !((NODE)->flags & NODE_BUILTIN))      \

    (NODE)->value.macro->used = 1; } while (0)

/* A generic memory buffer, and operations on it.  */

typedef struct _cpp_buff _cpp_buff;

struct _cpp_buff

{

  struct _cpp_buff *next;

  unsigned char *base, *cur, *limit;

};

extern _cpp_buff *_cpp_get_buff (cpp_reader *, size_t);

extern void _cpp_release_buff (cpp_reader *, _cpp_buff *);

extern void _cpp_extend_buff (cpp_reader *, _cpp_buff **, size_t);

extern _cpp_buff *_cpp_append_extend_buff (cpp_reader *, _cpp_buff *, size_t);

extern void _cpp_free_buff (_cpp_buff *);

extern unsigned char *_cpp_aligned_alloc (cpp_reader *, size_t);

extern unsigned char *_cpp_unaligned_alloc (cpp_reader *, size_t);

#define BUFF_ROOM(BUFF) (size_t) ((BUFF)->limit - (BUFF)->cur)

#define BUFF_FRONT(BUFF) ((BUFF)->cur)

#define BUFF_LIMIT(BUFF) ((BUFF)->limit)

/* #include types.  */

enum include_type {IT_INCLUDE, IT_INCLUDE_NEXT, IT_IMPORT, IT_CMDLINE};

union utoken

{

  const cpp_token *token;

  const cpp_token **ptoken;

};

/* A "run" of tokens; part of a chain of runs.  */

typedef struct tokenrun tokenrun;

struct tokenrun

{

  tokenrun *next, *prev;

  cpp_token *base, *limit;

};

/* Accessor macros for struct cpp_context.  */

#define FIRST(c) ((c)->u.iso.first)

#define LAST(c) ((c)->u.iso.last)

#define CUR(c) ((c)->u.trad.cur)

#define RLIMIT(c) ((c)->u.trad.rlimit)

/* This describes some additional data that is added to the macro

   token context of type cpp_context, when -ftrack-macro-expansion is

   on.  */

typedef struct

{

  /* The node of the macro we are referring to.  */

  cpp_hashnode *macro_node;

  /* This buffer contains an array of virtual locations.  The virtual

     location at index 0 is the virtual location of the token at index

     other virtual locations.  */

  source_location *virt_locs;

  /* This is a pointer to the current virtual location.  This is used

     to iterate over the virtual locations while we iterate over the

     tokens they belong to.  */

  source_location *cur_virt_loc;

} macro_context;

/* The kind of tokens carried by a cpp_context.  */

enum context_tokens_kind {

  /* This is the value of cpp_context::tokens_kind if u.iso.first

     contains an instance of cpp_token **.  */

  TOKENS_KIND_INDIRECT,

  /* This is the value of cpp_context::tokens_kind if u.iso.first

     contains an instance of cpp_token *.  */

  TOKENS_KIND_DIRECT,

  /* This is the value of cpp_context::tokens_kind when the token

     context contains tokens resulting from macro expansion.  In that

     case struct cpp_context::macro points to an instance of struct

     macro_context.  This is used only when the

     -ftrack-macro-expansion flag is on.  */

  TOKENS_KIND_EXTENDED

};

typedef struct cpp_context cpp_context;

struct cpp_context

{

  /* Doubly-linked list.  */

  cpp_context *next, *prev;

  union

  {

    /* For ISO macro expansion.  Contexts other than the base context

       are contiguous tokens.  e.g. macro expansions, expanded

       argument tokens.  */

    struct

    {

      union utoken first;

      union utoken last;

    } iso;

    /* For traditional macro expansion.  */

    struct

    {

      const unsigned char *cur;

      const unsigned char *rlimit;

    } trad;

  } u;

  /* If non-NULL, a buffer used for storage related to this context.

     When the context is popped, the buffer is released.  */

  _cpp_buff *buff;

  /* If tokens_kind is TOKEN_KIND_EXTENDED, then (as we thus are in a

     macro context) this is a pointer to an instance of macro_context.

     Otherwise if tokens_kind is *not* TOKEN_KIND_EXTENDED, then, if

     we are in a macro context, this is a pointer to an instance of

     cpp_hashnode, representing the name of the macro this context is

     for.  If we are not in a macro context, then this is just NULL.

     Note that when tokens_kind is TOKEN_KIND_EXTENDED, the memory

     used by the instance of macro_context pointed to by this member

     is de-allocated upon de-allocation of the instance of struct

     cpp_context.  */

  union

  {

    macro_context *mc;

    cpp_hashnode *macro;

  } c;

  /* This determines the type of tokens held by this context.  */

  enum context_tokens_kind tokens_kind;

};

struct lexer_state

{

  /* Nonzero if first token on line is CPP_HASH.  */

  unsigned char in_directive;

  /* Nonzero if in a directive that will handle padding tokens itself.

     #include needs this to avoid problems with computed include and

     spacing between tokens.  */

  unsigned char directive_wants_padding;

  /* True if we are skipping a failed conditional group.  */

  unsigned char skipping;

  /* Nonzero if in a directive that takes angle-bracketed headers.  */

  unsigned char angled_headers;

  /* Nonzero if in a #if or #elif directive.  */

  unsigned char in_expression;

  /* Nonzero to save comments.  Turned off if discard_comments, and in

     all directives apart from #define.  */

  unsigned char save_comments;

  /* Nonzero if lexing __VA_ARGS__ is valid.  */

  unsigned char va_args_ok;

  /* Nonzero if lexing poisoned identifiers is valid.  */

  unsigned char poisoned_ok;

  /* Nonzero to prevent macro expansion.  */

  unsigned char prevent_expansion;

  /* Nonzero when parsing arguments to a function-like macro.  */

  unsigned char parsing_args;

  /* Nonzero if prevent_expansion is true only because output is

     being discarded.  */

  unsigned char discarding_output;

  /* Nonzero to skip evaluating part of an expression.  */

  unsigned int skip_eval;

  /* Nonzero when handling a deferred pragma.  */

  unsigned char in_deferred_pragma;

  /* Nonzero if the deferred pragma being handled allows macro expansion.  */

  unsigned char pragma_allow_expansion;

};

/* Special nodes - identifiers with predefined significance.  */

struct spec_nodes

{

  cpp_hashnode *n_defined;              /* defined operator */

  cpp_hashnode *n_true;                 /* C++ keyword true */

  cpp_hashnode *n_false;                /* C++ keyword false */

  cpp_hashnode *n__VA_ARGS__;           /* C99 vararg macros */

};

typedef struct _cpp_line_note _cpp_line_note;

struct _cpp_line_note

{

  /* Location in the clean line the note refers to.  */

  const unsigned char *pos;

  /* Type of note.  The 9 'from' trigraph characters represent those

     trigraphs, '\\' an escaped newline, ' ' an escaped newline with

     intervening space, 0 represents a note that has already been handled,

     and anything else is invalid.  */

  unsigned int type;

};

/* Represents the contents of a file cpplib has read in.  */

struct cpp_buffer

{

  const unsigned char *cur;        /* Current location.  */

  const unsigned char *line_base;  /* Start of current physical line.  */

  const unsigned char *next_line;  /* Start of to-be-cleaned logical line.  */

  const unsigned char *buf;        /* Entire character buffer.  */

  const unsigned char *rlimit;     /* Writable byte at end of file.  */

  _cpp_line_note *notes;           /* Array of notes.  */

  unsigned int cur_note;           /* Next note to process.  */

  unsigned int notes_used;         /* Number of notes.  */

  unsigned int notes_cap;          /* Size of allocated array.  */

  struct cpp_buffer *prev;

  /* Pointer into the file table; non-NULL if this is a file buffer.

     Used for include_next and to record control macros.  */

  struct _cpp_file *file;

  /* Saved value of __TIMESTAMP__ macro - date and time of last modification

     of the assotiated file.  */

  const unsigned char *timestamp;

  /* Value of if_stack at start of this file.

     Used to prohibit unmatched #endif (etc) in an include file.  */

  struct if_stack *if_stack;

  /* True if we need to get the next clean line.  */

  bool need_line;

  /* True if we have already warned about C++ comments in this file.

     The warning happens only for C89 extended mode with -pedantic on,

     or for -Wtraditional, and only once per file (otherwise it would

     be far too noisy).  */

  unsigned int warned_cplusplus_comments : 1;

  /* True if we don't process trigraphs and escaped newlines.  True

     for preprocessed input, command line directives, and _Pragma

     buffers.  */

  unsigned int from_stage3 : 1;

  /* At EOF, a buffer is automatically popped.  If RETURN_AT_EOF is

     true, a CPP_EOF token is then returned.  Otherwise, the next

     token from the enclosing buffer is returned.  */

  unsigned int return_at_eof : 1;

  /* One for a system header, two for a C system header file that therefore

     needs to be extern "C" protected in C++, and zero otherwise.  */

  unsigned char sysp;

  /* The directory of the this buffer's file.  Its NAME member is not

     allocated, so we don't need to worry about freeing it.  */

  struct cpp_dir dir;

  /* Descriptor for converting from the input character set to the

     source character set.  */

  struct cset_converter input_cset_desc;

};

/* The list of saved macros by push_macro pragma.  */

struct def_pragma_macro {

  /* Chain element to previous saved macro.  */

  struct def_pragma_macro *next;

  /* Name of the macro.  */

  char *name;

  /* The stored macro content.  */

  unsigned char *definition;

  /* Definition line number.  */

  source_location line;

  /* If macro defined in system header.  */

  unsigned int syshdr   : 1;

  /* Nonzero if it has been expanded or had its existence tested.  */

  unsigned int used     : 1;

  /* Mark if we save an undefined macro.  */

  unsigned int is_undef : 1;

};

/* A cpp_reader encapsulates the "state" of a pre-processor run.

   Applying cpp_get_token repeatedly yields a stream of pre-processor

   tokens.  Usually, there is only one cpp_reader object active.  */

struct cpp_reader

{

  /* Top of buffer stack.  */

  cpp_buffer *buffer;

  /* Overlaid buffer (can be different after processing #include).  */

  cpp_buffer *overlaid_buffer;

  /* Lexer state.  */

  struct lexer_state state;

  /* Source line tracking.  */

  struct line_maps *line_table;

  /* The line of the '#' of the current directive.  */

  source_location directive_line;

  /* Memory buffers.  */

  _cpp_buff *a_buff;            /* Aligned permanent storage.  */

  _cpp_buff *u_buff;            /* Unaligned permanent storage.  */

  _cpp_buff *free_buffs;        /* Free buffer chain.  */

  /* Context stack.  */

  struct cpp_context base_context;

  struct cpp_context *context;

  /* If in_directive, the directive if known.  */

  const struct directive *directive;

  /* Token generated while handling a directive, if any. */

  cpp_token directive_result;

  /* When expanding a macro at top-level, this is the location of the

     macro invocation.  */

  source_location invocation_location;

  /* True if this call to cpp_get_token should consider setting

     invocation_location.  */

  bool set_invocation_location;

  /* Search paths for include files.  */

  struct cpp_dir *quote_include;        /* "" */

  struct cpp_dir *bracket_include;      /* <> */

  struct cpp_dir no_search_path;        /* No path.  */

  /* Chain of all hashed _cpp_file instances.  */

  struct _cpp_file *all_files;

  struct _cpp_file *main_file;

  /* File and directory hash table.  */

  struct htab *file_hash;

  struct htab *dir_hash;

  struct file_hash_entry_pool *file_hash_entries;

  /* Negative path lookup hash table.  */

  struct htab *nonexistent_file_hash;

  struct obstack nonexistent_file_ob;

  /* Nonzero means don't look for #include "foo" the source-file

     directory.  */

  bool quote_ignores_source_dir;

  /* Nonzero if any file has contained #pragma once or #import has

     been used.  */

  bool seen_once_only;

  /* Multiple include optimization.  */

  const cpp_hashnode *mi_cmacro;

  const cpp_hashnode *mi_ind_cmacro;

  bool mi_valid;

  /* Lexing.  */

  cpp_token *cur_token;

  tokenrun base_run, *cur_run;

  unsigned int lookaheads;

  /* Nonzero prevents the lexer from re-using the token runs.  */

  unsigned int keep_tokens;

  /* Buffer to hold macro definition string.  */

  unsigned char *macro_buffer;

  unsigned int macro_buffer_len;

  /* Descriptor for converting from the source character set to the

     execution character set.  */

  struct cset_converter narrow_cset_desc;

  /* Descriptor for converting from the source character set to the

     UTF-8 execution character set.  */

  struct cset_converter utf8_cset_desc;

  /* Descriptor for converting from the source character set to the

     UTF-16 execution character set.  */

  struct cset_converter char16_cset_desc;

  /* Descriptor for converting from the source character set to the

     UTF-32 execution character set.  */

  struct cset_converter char32_cset_desc;

  /* Descriptor for converting from the source character set to the

     wide execution character set.  */

  struct cset_converter wide_cset_desc;

  /* Date and time text.  Calculated together if either is requested.  */

  const unsigned char *date;

  const unsigned char *time;

  /* EOF token, and a token forcing paste avoidance.  */

  cpp_token avoid_paste;

  cpp_token eof;

  /* Opaque handle to the dependencies of mkdeps.c.  */

  struct deps *deps;

  /* Obstack holding all macro hash nodes.  This never shrinks.

     See identifiers.c */

  struct obstack hash_ob;

  /* Obstack holding buffer and conditional structures.  This is a

     real stack.  See directives.c.  */

  struct obstack buffer_ob;

  /* Pragma table - dynamic, because a library user can add to the

     list of recognized pragmas.  */

  struct pragma_entry *pragmas;

  /* Call backs to cpplib client.  */

  struct cpp_callbacks cb;

  /* Identifier hash table.  */

  struct ht *hash_table;

  /* Expression parser stack.  */

  struct op *op_stack, *op_limit;

  /* User visible options.  */

  struct cpp_options opts;

  /* Special nodes - identifiers with predefined significance to the

     preprocessor.  */

  struct spec_nodes spec_nodes;

  /* Whether cpplib owns the hashtable.  */

  bool our_hashtable;

  /* Traditional preprocessing output buffer (a logical line).  */

  struct

  {

    unsigned char *base;

    unsigned char *limit;

    unsigned char *cur;

    source_location first_line;

  } out;

  /* Used for buffer overlays by traditional.c.  */

  const unsigned char *saved_cur, *saved_rlimit, *saved_line_base;

  /* A saved list of the defined macros, for dependency checking

     of precompiled headers.  */

  struct cpp_savedstate *savedstate;

  /* Next value of __COUNTER__ macro. */

  unsigned int counter;

  /* Table of comments, when state.save_comments is true.  */

  cpp_comment_table comments;

  /* List of saved macros by push_macro.  */

  struct def_pragma_macro *pushed_macros;

  /* If non-null, the lexer will use this location for the next token

     instead of getting a location from the linemap.  */

  source_location *forced_token_location_p;

};

/* Character classes.  Based on the more primitive macros in safe-ctype.h.

   If the definition of `numchar' looks odd to you, please look up the

   definition of a pp-number in the C standard [section 6.4.8 of C99].

   In the unlikely event that characters other than \r and \n enter

   the set is_vspace, the macro handle_newline() in lex.c must be

   updated.  */

#define _dollar_ok(x)   ((x) == '$' && CPP_OPTION (pfile, dollars_in_ident))

#define is_idchar(x)    (ISIDNUM(x) || _dollar_ok(x))

#define is_numchar(x)   ISIDNUM(x)

#define is_idstart(x)   (ISIDST(x) || _dollar_ok(x))

#define is_numstart(x)  ISDIGIT(x)

#define is_hspace(x)    ISBLANK(x)

#define is_vspace(x)    IS_VSPACE(x)

#define is_nvspace(x)   IS_NVSPACE(x)

#define is_space(x)     IS_SPACE_OR_NUL(x)

/* This table is constant if it can be initialized at compile time,

   which is the case if cpp was compiled with GCC >=2.7, or another

   compiler that supports C99.  */

#if HAVE_DESIGNATED_INITIALIZERS

extern const unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];

#else

extern unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];

#endif

/* Macros.  */

static inline int cpp_in_system_header (cpp_reader *);

static inline int

cpp_in_system_header (cpp_reader *pfile)

{

  return pfile->buffer ? pfile->buffer->sysp : 0;

}

#define CPP_PEDANTIC(PF) CPP_OPTION (PF, cpp_pedantic)

#define CPP_WTRADITIONAL(PF) CPP_OPTION (PF, cpp_warn_traditional)

static inline int cpp_in_primary_file (cpp_reader *);

static inline int

cpp_in_primary_file (cpp_reader *pfile)

{

  return pfile->line_table->depth == 1;

}

/* In macro.c */

extern void _cpp_free_definition (cpp_hashnode *);

extern bool _cpp_create_definition (cpp_reader *, cpp_hashnode *);

extern void _cpp_pop_context (cpp_reader *);

extern void _cpp_push_text_context (cpp_reader *, cpp_hashnode *,

                                    const unsigned char *, size_t);

extern bool _cpp_save_parameter (cpp_reader *, cpp_macro *, cpp_hashnode *);

extern bool _cpp_arguments_ok (cpp_reader *, cpp_macro *, const cpp_hashnode *,

                               unsigned int);

extern const unsigned char *_cpp_builtin_macro_text (cpp_reader *,

                                                     cpp_hashnode *);

extern int _cpp_warn_if_unused_macro (cpp_reader *, cpp_hashnode *, void *);

extern void _cpp_push_token_context (cpp_reader *, cpp_hashnode *,

                                     const cpp_token *, unsigned int);

extern void _cpp_backup_tokens_direct (cpp_reader *, unsigned int);

/* In identifiers.c */

extern void _cpp_init_hashtable (cpp_reader *, hash_table *);

extern void _cpp_destroy_hashtable (cpp_reader *);

/* In files.c */

typedef struct _cpp_file _cpp_file;

extern _cpp_file *_cpp_find_file (cpp_reader *, const char *, cpp_dir *,

                                  bool, int);

extern bool _cpp_find_failed (_cpp_file *);

extern void _cpp_mark_file_once_only (cpp_reader *, struct _cpp_file *);

extern void _cpp_fake_include (cpp_reader *, const char *);

extern bool _cpp_stack_file (cpp_reader *, _cpp_file*, bool);

extern bool _cpp_stack_include (cpp_reader *, const char *, int,

                                enum include_type);

extern int _cpp_compare_file_date (cpp_reader *, const char *, int);

extern void _cpp_report_missing_guards (cpp_reader *);

extern void _cpp_init_files (cpp_reader *);

extern void _cpp_cleanup_files (cpp_reader *);

extern void _cpp_pop_file_buffer (cpp_reader *, struct _cpp_file *);

extern bool _cpp_save_file_entries (cpp_reader *pfile, FILE *f);

extern bool _cpp_read_file_entries (cpp_reader *, FILE *);

extern const char *_cpp_get_file_name (_cpp_file *);

extern struct stat *_cpp_get_file_stat (_cpp_file *);

/* In expr.c */

extern bool _cpp_parse_expr (cpp_reader *, bool);

extern struct op *_cpp_expand_op_stack (cpp_reader *);

/* In lex.c */

extern void _cpp_process_line_notes (cpp_reader *, int);

extern void _cpp_clean_line (cpp_reader *);

extern bool _cpp_get_fresh_line (cpp_reader *);

extern bool _cpp_skip_block_comment (cpp_reader *);

extern cpp_token *_cpp_temp_token (cpp_reader *);

extern const cpp_token *_cpp_lex_token (cpp_reader *);

extern cpp_token *_cpp_lex_direct (cpp_reader *);

extern int _cpp_equiv_tokens (const cpp_token *, const cpp_token *);

extern void _cpp_init_tokenrun (tokenrun *, unsigned int);

extern cpp_hashnode *_cpp_lex_identifier (cpp_reader *, const char *);

extern int _cpp_remaining_tokens_num_in_context (cpp_context *);

extern void _cpp_init_lexer (void);

/* In init.c.  */

extern void _cpp_maybe_push_include_file (cpp_reader *);

extern const char *cpp_named_operator2name (enum cpp_ttype type);

/* In directives.c */

extern int _cpp_test_assertion (cpp_reader *, unsigned int *);

extern int _cpp_handle_directive (cpp_reader *, int);

extern void _cpp_define_builtin (cpp_reader *, const char *);

extern char ** _cpp_save_pragma_names (cpp_reader *);

extern void _cpp_restore_pragma_names (cpp_reader *, char **);

extern int _cpp_do__Pragma (cpp_reader *);

extern void _cpp_init_directives (cpp_reader *);

extern void _cpp_init_internal_pragmas (cpp_reader *);

extern void _cpp_do_file_change (cpp_reader *, enum lc_reason, const char *,

                                 linenum_type, unsigned int);

extern void _cpp_pop_buffer (cpp_reader *);

/* In directives.c */

struct _cpp_dir_only_callbacks

{

  /* Called to print a block of lines. */

  void (*print_lines) (int, const void *, size_t);

  void (*maybe_print_line) (source_location);

};

extern void _cpp_preprocess_dir_only (cpp_reader *,

                                      const struct _cpp_dir_only_callbacks *);

/* In traditional.c.  */

extern bool _cpp_scan_out_logical_line (cpp_reader *, cpp_macro *);

extern bool _cpp_read_logical_line_trad (cpp_reader *);

extern void _cpp_overlay_buffer (cpp_reader *pfile, const unsigned char *,

                                 size_t);

extern void _cpp_remove_overlay (cpp_reader *);

extern bool _cpp_create_trad_definition (cpp_reader *, cpp_macro *);

extern bool _cpp_expansions_different_trad (const cpp_macro *,

                                            const cpp_macro *);

extern unsigned char *_cpp_copy_replacement_text (const cpp_macro *,

                                                  unsigned char *);

extern size_t _cpp_replacement_text_len (const cpp_macro *);

/* In charset.c.  */

/* The normalization state at this point in the sequence.

   It starts initialized to all zeros, and at the end

   'level' is the normalization level of the sequence.  */

struct normalize_state

{

  /* The previous character.  */

  cppchar_t previous;

  /* The combining class of the previous character.  */

  unsigned char prev_class;

  /* The lowest normalization level so far.  */

  enum cpp_normalize_level level;

};

#define INITIAL_NORMALIZE_STATE { 0, 0, normalized_KC }

#define NORMALIZE_STATE_RESULT(st) ((st)->level)

/* We saw a character that matches ISIDNUM(), update a

   normalize_state appropriately.  */

#define NORMALIZE_STATE_UPDATE_IDNUM(st) \

  ((st)->previous = 0, (st)->prev_class = 0)

extern cppchar_t _cpp_valid_ucn (cpp_reader *, const unsigned char **,

                                 const unsigned char *, int,

                                 struct normalize_state *state);

extern void _cpp_destroy_iconv (cpp_reader *);

extern unsigned char *_cpp_convert_input (cpp_reader *, const char *,

                                          unsigned char *, size_t, size_t,

                                          const unsigned char **, off_t *);