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/* ebrowse.c --- parsing files for the ebrowse C++ browser

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Copyright (C) 1992-2018 Free Software Foundation, Inc.
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This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
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GNU Emacs 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
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along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
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#include <config.h>
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#include <stddef.h>
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#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
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#include <getopt.h>
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#include <flexmember.h>
#include <min-max.h>
#include <unlocked-io.h>

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/* The SunOS compiler doesn't have SEEK_END.  */
#ifndef SEEK_END
#define SEEK_END 2
#endif

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/* Files are read in chunks of this number of bytes.  */

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enum { READ_CHUNK_SIZE = 100 * 1024 };
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/* Value is true if strings X and Y compare equal.  */

static bool
streq (char const *x, char const *y)
{
  return strcmp (x, y) == 0;
}

static bool
filename_eq (char const *x, char const *y)
{
#ifdef __MSDOS__
  return strcasecmp (x, y) == 0;
#elif defined WINDOWSNT
  return stricmp (x, y) == 0;
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#else
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  return streq (x, y);
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#endif
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}

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/* The default output file name.  */

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#define DEFAULT_OUTFILE "BROWSE"
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/* A version string written to the output file.  Change this whenever
   the structure of the output file changes.  */

#define EBROWSE_FILE_VERSION "ebrowse 5.0"

/* The output file consists of a tree of Lisp objects, with major
   nodes built out of Lisp structures.  These are the heads of the
   Lisp structs with symbols identifying their type.  */

#define TREE_HEADER_STRUCT	"[ebrowse-hs "
#define TREE_STRUCT		"[ebrowse-ts "
#define MEMBER_STRUCT		"[ebrowse-ms "
#define CLASS_STRUCT		"[ebrowse-cs "

/* The name of the symbol table entry for global functions, variables,
   defines etc.  This name also appears in the browser display.  */

#define GLOBALS_NAME "*Globals*"

/* Token definitions.  */

enum token
{
  YYEOF = 0,			/* end of file */
  CSTRING = 256,		/* string constant */
  CCHAR,			/* character constant */
  CINT,				/* integral constant */
  CFLOAT,			/* real constant */

  ELLIPSIS,			/* ... */
  LSHIFTASGN,			/* <<= */
  RSHIFTASGN,			/* >>= */
  ARROWSTAR,			/* ->* */
  IDENT,			/* identifier */
  DIVASGN,			/* /= */
  INC,				/* ++ */
  ADDASGN,			/* += */
  DEC,				/* -- */
  ARROW,			/* -> */
  SUBASGN,			/* -= */
  MULASGN,			/* *= */
  MODASGN,			/* %= */
  LOR,				/* || */
  ORASGN,			/* |= */
  LAND,				/* && */
  ANDASGN,			/* &= */
  XORASGN,			/* ^= */
  POINTSTAR,			/* .* */
  DCOLON,			/* :: */
  EQ,				/* == */
  NE,				/* != */
  LE,				/* <= */
  LSHIFT,			/* << */
  GE,				/* >= */
  RSHIFT,			/* >> */

/* Keywords.  The undef's are there because these
   three symbols are very likely to be defined somewhere.  */
#undef BOOL
#undef TRUE
#undef FALSE

  ASM,				/* asm */
  AUTO,				/* auto */
  BREAK,			/* break */
  CASE,				/* case  */
  CATCH,			/* catch */
  CHAR,				/* char */
  CLASS,			/* class */
  CONST,			/* const */
  CONTINUE,			/* continue */
  DEFAULT,			/* default */
  DELETE,			/* delete */
  DO,				/* do */
  DOUBLE,			/* double */
  ELSE,				/* else */
  ENUM,				/* enum */
  EXTERN,			/* extern */
  FLOAT,			/* float */
  FOR,				/* for */
  FRIEND,			/* friend */
  GOTO,				/* goto */
  IF,				/* if */
  T_INLINE,			/* inline */
  INT,				/* int */
  LONG,				/* long */
  NEW,				/* new */
  OPERATOR,			/* operator */
  PRIVATE,			/* private */
  PROTECTED,			/* protected */
  PUBLIC,			/* public */
  REGISTER,			/* register */
  RETURN,			/* return */
  SHORT,			/* short */
  SIGNED,			/* signed */
  SIZEOF,			/* sizeof */
  STATIC,			/* static */
  STRUCT,			/* struct */
  SWITCH,			/* switch */
  TEMPLATE,			/* template */
  THIS,				/* this */
  THROW,			/* throw */
  TRY,				/* try */
  TYPEDEF,			/* typedef */
  UNION,			/* union */
  UNSIGNED,			/* unsigned */
  VIRTUAL,			/* virtual */
  VOID,				/* void */
  VOLATILE,			/* volatile */
  WHILE,			/* while */
  MUTABLE,			/* mutable */
  BOOL,				/* bool */
  TRUE,				/* true */
  FALSE,			/* false */
  SIGNATURE,			/* signature (GNU extension) */
  NAMESPACE,			/* namespace */
  EXPLICIT,			/* explicit */
  TYPENAME,			/* typename */
  CONST_CAST,			/* const_cast */
  DYNAMIC_CAST,			/* dynamic_cast */
  REINTERPRET_CAST,		/* reinterpret_cast */
  STATIC_CAST,			/* static_cast */
  TYPEID,			/* typeid */
  USING,			/* using */
  WCHAR				/* wchar_t */
};

/* Storage classes, in a wider sense.  */

enum sc
{
  SC_UNKNOWN,
  SC_MEMBER,			/* Is an instance member.  */
  SC_STATIC,			/* Is static member.  */
  SC_FRIEND,			/* Is friend function.  */
  SC_TYPE			/* Is a type definition.  */
};

/* Member visibility.  */

enum visibility
{
  V_PUBLIC,
  V_PROTECTED,
  V_PRIVATE
};

/* Member flags.  */

#define F_VIRTUAL	1	/* Is virtual function.  */
#define F_INLINE	2	/* Is inline function.  */
#define F_CONST		4	/* Is const.  */
#define F_PURE		8	/* Is pure virtual function.  */
#define F_MUTABLE	16	/* Is mutable.  */
#define F_TEMPLATE	32	/* Is a template.  */
#define F_EXPLICIT	64	/* Is explicit constructor.  */
#define F_THROW		128	/* Has a throw specification.  */
#define F_EXTERNC	256	/* Is declared extern "C".  */
#define F_DEFINE	512	/* Is a #define.  */

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/* Set and test a bit in an int.  */
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static void
set_flag (int *f, int flag)
{
  *f |= flag;
}

static bool
has_flag (int f, int flag)
{
  return (f & flag) != 0;
}
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/* Structure describing a class member.  */

struct member
{
  struct member *next;		/* Next in list of members.  */
  struct member *anext;		/* Collision chain in member_table.  */
  struct member **list;		/* Pointer to list in class.  */
  unsigned param_hash;		/* Hash value for parameter types.  */
  int vis;			/* Visibility (public, ...).  */
  int flags;			/* See F_* above.  */
  char *regexp;			/* Matching regular expression.  */
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  const char *filename;		/* Don't free this shared string.  */
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  int pos;			/* Buffer position of occurrence.  */
  char *def_regexp;		/* Regular expression matching definition.  */
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  const char *def_filename;	/* File name of definition.  */
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  int def_pos;			/* Buffer position of definition.  */
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  char name[FLEXIBLE_ARRAY_MEMBER]; /* Member name.  */
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};

/* Structures of this type are used to connect class structures with
   their super and subclasses.  */

struct link
{
  struct sym *sym;		/* The super or subclass.  */
  struct link *next;		/* Next in list or NULL.  */
};

/* Structure used to record namespace aliases.  */

struct alias
{
  struct alias *next;		/* Next in list.  */
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  struct sym *namesp;		/* Namespace in which defined.  */
  struct link *aliasee;		/* List of aliased namespaces (A::B::C...).  */
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  char name[FLEXIBLE_ARRAY_MEMBER]; /* Alias name.  */
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};

/* The structure used to describe a class in the symbol table,
   or a namespace in all_namespaces.  */

struct sym
{
  int flags;			/* Is class a template class?.  */
  unsigned char visited;	/* Used to find circles.  */
  struct sym *next;             /* Hash collision list.  */
  struct link *subs;		/* List of subclasses.  */
  struct link *supers;		/* List of superclasses.  */
  struct member *vars;		/* List of instance variables.  */
  struct member *fns;		/* List of instance functions.  */
  struct member *static_vars;	/* List of static variables.  */
  struct member *static_fns;	/* List of static functions.  */
  struct member *friends;	/* List of friend functions.  */
  struct member *types;		/* List of local types.  */
  char *regexp;			/* Matching regular expression.  */
  int pos;			/* Buffer position.  */
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  const char *filename;		/* File in which it can be found.  */
  const char *sfilename; 	/* File in which members can be found.  */
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  struct sym *namesp;		/* Namespace in which defined. .  */
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  char name[FLEXIBLE_ARRAY_MEMBER]; /* Name of the class.  */
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};

/* Experimental: Print info for `--position-info'.  We print
   '(CLASS-NAME SCOPE MEMBER-NAME).  */

#define P_DEFN	1
#define P_DECL  2

int info_where;
struct sym *info_cls = NULL;
struct member *info_member = NULL;

/* Experimental.  For option `--position-info', the buffer position we
   are interested in.  When this position is reached, print out
   information about what we know about that point.  */

int info_position = -1;

/* Command line options structure for getopt_long.  */

struct option options[] =
{
  {"append", 			no_argument, 	   NULL, 'a'},
  {"files", 			required_argument, NULL, 'f'},
  {"help", 			no_argument, 	   NULL, -2},
  {"min-regexp-length", 	required_argument, NULL, 'm'},
  {"max-regexp-length", 	required_argument, NULL, 'M'},
  {"no-nested-classes", 	no_argument, 	   NULL, 'n'},
  {"no-regexps", 		no_argument, 	   NULL, 'x'},
  {"no-structs-or-unions", 	no_argument, 	   NULL, 's'},
  {"output-file", 		required_argument, NULL, 'o'},
  {"position-info", 		required_argument, NULL, 'p'},
  {"search-path", 		required_argument, NULL, 'I'},
  {"verbose", 			no_argument, 	   NULL, 'v'},
  {"version", 			no_argument, 	   NULL, -3},
  {"very-verbose", 		no_argument, 	   NULL, 'V'},
  {NULL, 			0, 		   NULL, 0}
};

/* Semantic values of tokens.  Set by yylex..  */

unsigned yyival;		/* Set for token CINT.  */
char *yytext;			/* Set for token IDENT.  */
char *yytext_end;

/* Output file.  */

FILE *yyout;

/* Current line number.  */

int yyline;

/* The name of the current input file.  */

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const char *filename;
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/* Three character class vectors, and macros to test membership
   of characters.  */

char is_ident[255];
char is_digit[255];
char is_white[255];

#define IDENTP(C)	is_ident[(unsigned char) (C)]
#define DIGITP(C)	is_digit[(unsigned char) (C)]
#define WHITEP(C)	is_white[(unsigned char) (C)]

/* Command line flags.  */

int f_append;
int f_verbose;
int f_very_verbose;
int f_structs = 1;
int f_regexps = 1;
int f_nested_classes = 1;

/* Maximum and minimum lengths of regular expressions matching a
   member, class etc., for writing them to the output file.  These are
   overridable from the command line.  */

int min_regexp = 5;
int max_regexp = 50;

/* Input buffer.  */

char *inbuffer;
char *in;
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size_t inbuffer_size;
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/* Return the current buffer position in the input file.  */

#define BUFFER_POS() (in - inbuffer)

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/* If current lookahead is CSTRING, the following points to the
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   first character in the string constant.  Used for recognizing
   extern "C".  */

char *string_start;

/* The size of the hash tables for classes.and members.  Should be
   prime.  */

#define TABLE_SIZE 1001

/* The hash table for class symbols.  */

struct sym *class_table[TABLE_SIZE];

/* Hash table containing all member structures.  This is generally
   faster for member lookup than traversing the member lists of a
   `struct sym'.  */

struct member *member_table[TABLE_SIZE];

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/* Hash table for namespace aliases */

struct alias *namespace_alias_table[TABLE_SIZE];

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/* The special class symbol used to hold global functions,
   variables etc.  */

struct sym *global_symbols;

/* The current namespace.  */

struct sym *current_namespace;

/* The list of all known namespaces.  */

struct sym *all_namespaces;

/* Stack of namespaces we're currently nested in, during the parse.  */

struct sym **namespace_stack;
int namespace_stack_size;
int namespace_sp;

/* The current lookahead token.  */

int tk = -1;

/* Structure describing a keyword.  */

struct kw
{
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  const char *name;		/* Spelling.  */
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  int tk;			/* Token value.  */
  struct kw *next;		/* Next in collision chain.  */
};

/* Keywords are lookup up in a hash table of their own.  */

#define KEYWORD_TABLE_SIZE 1001
struct kw *keyword_table[KEYWORD_TABLE_SIZE];

/* Search path.  */

struct search_path
{
  char *path;
  struct search_path *next;
};

struct search_path *search_path;
struct search_path *search_path_tail;

/* Function prototypes.  */

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static char *matching_regexp (void);
static struct sym *add_sym (const char *, struct sym *);
static void add_global_defn (char *, char *, int, unsigned, int, int, int);
static void add_global_decl (char *, char *, int, unsigned, int, int, int);
static struct member *add_member (struct sym *, char *, int, int, unsigned);
static void class_definition (struct sym *, int, int, int);
static char *operator_name (int *);
static void parse_qualified_param_ident_or_type (char **);
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/***********************************************************************
			      Utilities
 ***********************************************************************/

/* Print an error in a printf-like style with the current input file
   name and line number.  */

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static void
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yyerror (const char *format, const char *s)
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{
  fprintf (stderr, "%s:%d: ", filename, yyline);
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  fprintf (stderr, format, s);
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  putc ('\n', stderr);
}


/* Like malloc but print an error and exit if not enough memory is
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   available.  */
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static void *
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xmalloc (size_t nbytes)
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{
  void *p = malloc (nbytes);
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  if (p == NULL)
    {
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      yyerror ("out of memory", NULL);
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      exit (EXIT_FAILURE);
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    }
  return p;
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}


/* Like realloc but print an error and exit if out of memory.  */

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static void *
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xrealloc (void *p, size_t sz)
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{
  p = realloc (p, sz);
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  if (p == NULL)
    {
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      yyerror ("out of memory", NULL);
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      exit (EXIT_FAILURE);
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    }
  return p;
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}


/* Like strdup, but print an error and exit if not enough memory is
   available..  If S is null, return null.  */

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static char *
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xstrdup (char *s)
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{
  if (s)
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    return strcpy (xmalloc (strlen (s) + 1), s);
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  return s;
}



/***********************************************************************
			       Symbols
 ***********************************************************************/

/* Initialize the symbol table.  This currently only sets up the
   special symbol for globals (`*Globals*').  */

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static void
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init_sym (void)
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{
  global_symbols = add_sym (GLOBALS_NAME, NULL);
}


/* Add a symbol for class NAME to the symbol table.  NESTED_IN_CLASS
   is the class in which class NAME was found.  If it is null,
   this means the scope of NAME is the current namespace.

   If a symbol for NAME already exists, return that.  Otherwise
   create a new symbol and set it to default values.  */

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static struct sym *
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add_sym (const char *name, struct sym *nested_in_class)
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{
  struct sym *sym;
  unsigned h;
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  const char *s;
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  struct sym *scope = nested_in_class ? nested_in_class : current_namespace;

  for (s = name, h = 0; *s; ++s)
    h = (h << 1) ^ *s;
  h %= TABLE_SIZE;

  for (sym = class_table[h]; sym; sym = sym->next)
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    if (streq (name, sym->name)
	&& ((!sym->namesp && !scope)
	    || (sym->namesp && scope
		&& streq (sym->namesp->name, scope->name))))
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      break;

  if (sym == NULL)
    {
      if (f_very_verbose)
	{
	  putchar ('\t');
	  puts (name);
	}

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      sym = xmalloc (FLEXSIZEOF (struct sym, name, strlen (name) + 1));
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      memset (sym, 0, offsetof (struct sym, name));
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      strcpy (sym->name, name);
      sym->namesp = scope;
      sym->next = class_table[h];
      class_table[h] = sym;
    }

  return sym;
}


/* Add links between superclass SUPER and subclass SUB.  */

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static void
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add_link (struct sym *super, struct sym *sub)
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{
  struct link *lnk, *lnk2, *p, *prev;

  /* See if a link already exists.  */
  for (p = super->subs, prev = NULL;
       p && strcmp (sub->name, p->sym->name) > 0;
       prev = p, p = p->next)
    ;

  /* Avoid duplicates.  */
  if (p == NULL || p->sym != sub)
    {
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      lnk = (struct link *) xmalloc (sizeof *lnk);
      lnk2 = (struct link *) xmalloc (sizeof *lnk2);
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      lnk->sym = sub;
      lnk->next = p;

      if (prev)
	prev->next = lnk;
      else
	super->subs = lnk;

      lnk2->sym = super;
      lnk2->next = sub->supers;
      sub->supers = lnk2;
    }
}


/* Find in class CLS member NAME.

   VAR non-zero means look for a member variable; otherwise a function
   is searched.  SC specifies what kind of member is searched---a
   static, or per-instance member etc.  HASH is a hash code for the
   parameter types of functions.  Value is a pointer to the member
   found or null if not found.  */

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static struct member *
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find_member (struct sym *cls, char *name, int var, int sc, unsigned int hash)
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{
  struct member **list;
  struct member *p;
  unsigned name_hash = 0;
  char *s;
  int i;

  switch (sc)
    {
    case SC_FRIEND:
      list = &cls->friends;
      break;
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    case SC_TYPE:
      list = &cls->types;
      break;
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    case SC_STATIC:
      list = var ? &cls->static_vars : &cls->static_fns;
      break;
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    default:
      list = var ? &cls->vars : &cls->fns;
      break;
    }

  for (s = name; *s; ++s)
    name_hash = (name_hash << 1) ^ *s;
  i = name_hash % TABLE_SIZE;

  for (p = member_table[i]; p; p = p->anext)
    if (p->list == list && p->param_hash == hash && streq (name, p->name))
      break;

  return p;
}


/* Add to class CLS information for the declaration of member NAME.
   REGEXP is a regexp matching the declaration, if non-null.  POS is
   the position in the source where the declaration is found.  HASH is
   a hash code for the parameter list of the member, if it's a
   function.  VAR non-zero means member is a variable or type.  SC
   specifies the type of member (instance member, static, ...).  VIS
   is the member's visibility (public, protected, private).  FLAGS is
   a bit set giving additional information about the member (see the
   F_* defines).  */

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static void
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add_member_decl (struct sym *cls, char *name, char *regexp, int pos, unsigned int hash, int var, int sc, int vis, int flags)
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{
  struct member *m;

  m = find_member (cls, name, var, sc, hash);
  if (m == NULL)
    m = add_member (cls, name, var, sc, hash);

  /* Have we seen a new filename?  If so record that.  */
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  if (!cls->filename || !filename_eq (cls->filename, filename))
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    m->filename = filename;

  m->regexp = regexp;
  m->pos = pos;
  m->flags = flags;

  switch (vis)
    {
    case PRIVATE:
      m->vis = V_PRIVATE;
      break;

    case PROTECTED:
      m->vis = V_PROTECTED;
      break;

    case PUBLIC:
      m->vis = V_PUBLIC;
      break;
    }

  info_where = P_DECL;
  info_cls = cls;
  info_member = m;
}


/* Add to class CLS information for the definition of member NAME.
   REGEXP is a regexp matching the declaration, if non-null.  POS is
   the position in the source where the declaration is found.  HASH is
   a hash code for the parameter list of the member, if it's a
   function.  VAR non-zero means member is a variable or type.  SC
   specifies the type of member (instance member, static, ...).  VIS
   is the member's visibility (public, protected, private).  FLAGS is
   a bit set giving additional information about the member (see the
   F_* defines).  */

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static void
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add_member_defn (struct sym *cls, char *name, char *regexp, int pos, unsigned int hash, int var, int sc, int flags)
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{
  struct member *m;

  if (sc == SC_UNKNOWN)
    {
      m = find_member (cls, name, var, SC_MEMBER, hash);
      if (m == NULL)
	{
	  m = find_member (cls, name, var, SC_STATIC, hash);
	  if (m == NULL)
	    m = add_member (cls, name, var, sc, hash);
	}
    }
  else
    {
      m = find_member (cls, name, var, sc, hash);
      if (m == NULL)
	m = add_member (cls, name, var, sc, hash);
    }

  if (!cls->sfilename)
    cls->sfilename = filename;

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  if (!filename_eq (cls->sfilename, filename))
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    m->def_filename = filename;

  m->def_regexp = regexp;
  m->def_pos = pos;
  m->flags |= flags;

  info_where = P_DEFN;
  info_cls = cls;
  info_member = m;
}


/* Add a symbol for a define named NAME to the symbol table.
   REGEXP is a regular expression matching the define in the source,
   if it is non-null.  POS is the position in the file.  */

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static void
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add_define (char *name, char *regexp, int pos)
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{
  add_global_defn (name, regexp, pos, 0, 1, SC_FRIEND, F_DEFINE);
  add_global_decl (name, regexp, pos, 0, 1, SC_FRIEND, F_DEFINE);
}


/* Add information for the global definition of NAME.
   REGEXP is a regexp matching the declaration, if non-null.  POS is
   the position in the source where the declaration is found.  HASH is
   a hash code for the parameter list of the member, if it's a
   function.  VAR non-zero means member is a variable or type.  SC
   specifies the type of member (instance member, static, ...).  VIS
   is the member's visibility (public, protected, private).  FLAGS is
   a bit set giving additional information about the member (see the
   F_* defines).  */

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static void
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add_global_defn (char *name, char *regexp, int pos, unsigned int hash, int var, int sc, int flags)
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{
  int i;
  struct sym *sym;

  /* Try to find out for which classes a function is a friend, and add
     what we know about it to them.  */
  if (!var)
    for (i = 0; i < TABLE_SIZE; ++i)
      for (sym = class_table[i]; sym; sym = sym->next)
	if (sym != global_symbols && sym->friends)
	  if (find_member (sym, name, 0, SC_FRIEND, hash))
	    add_member_defn (sym, name, regexp, pos, hash, 0,
			     SC_FRIEND, flags);

  /* Add to global symbols.  */
  add_member_defn (global_symbols, name, regexp, pos, hash, var, sc, flags);
}


/* Add information for the global declaration of NAME.
   REGEXP is a regexp matching the declaration, if non-null.  POS is
   the position in the source where the declaration is found.  HASH is
   a hash code for the parameter list of the member, if it's a
   function.  VAR non-zero means member is a variable or type.  SC
   specifies the type of member (instance member, static, ...).  VIS
   is the member's visibility (public, protected, private).  FLAGS is
   a bit set giving additional information about the member (see the
   F_* defines).  */

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static void
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add_global_decl (char *name, char *regexp, int pos, unsigned int hash, int var, int sc, int flags)
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{
  /* Add declaration only if not already declared.  Header files must
     be processed before source files for this to have the right effect.
     I do not want to handle implicit declarations at the moment.  */
  struct member *m;
  struct member *found;

  m = found = find_member (global_symbols, name, var, sc, hash);
  if (m == NULL)
    m = add_member (global_symbols, name, var, sc, hash);

  /* Definition already seen => probably last declaration implicit.
     Override.  This means that declarations must always be added to
     the symbol table before definitions.  */
  if (!found)
    {
      if (!global_symbols->filename
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	  || !filename_eq (global_symbols->filename, filename))
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	m->filename = filename;

      m->regexp = regexp;
      m->pos = pos;
      m->vis = V_PUBLIC;
      m->flags = flags;

      info_where = P_DECL;
      info_cls = global_symbols;
      info_member = m;
    }
}


/* Add a symbol for member NAME to class CLS.
   VAR non-zero means it's a variable.  SC specifies the kind of
   member.  HASH is a hash code for the parameter types of a function.
   Value is a pointer to the member's structure.  */

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add_member (struct sym *cls, char *name, int var, int sc, unsigned int hash)
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{
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  struct member *m = xmalloc (FLEXSIZEOF (struct member, name,
					  strlen (name) + 1));
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  struct member **list;
  struct member *p;
  struct member *prev;
  unsigned name_hash = 0;
  int i;
  char *s;

  strcpy (m->name, name);
  m->param_hash = hash;

  m->vis = 0;
  m->flags = 0;
  m->regexp = NULL;
  m->filename = NULL;
  m->pos = 0;
  m->def_regexp = NULL;
  m->def_filename = NULL;
  m->def_pos = 0;

  assert (cls != NULL);

  switch (sc)
    {
    case SC_FRIEND:
      list = &cls->friends;
      break;
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    case SC_TYPE:
      list = &cls->types;
      break;
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    case SC_STATIC:
      list = var ? &cls->static_vars : &cls->static_fns;
      break;
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    default:
      list = var ? &cls->vars : &cls->fns;
      break;
    }

  for (s = name; *s; ++s)
    name_hash = (name_hash << 1) ^ *s;
  i = name_hash % TABLE_SIZE;
  m->anext = member_table[i];
  member_table[i] = m;
  m->list = list;

  /* Keep the member list sorted.  It's cheaper to do it here than to
     sort them in Lisp.  */
  for (prev = NULL, p = *list;
       p && strcmp (name, p->name) > 0;
       prev = p, p = p->next)
    ;

  m->next = p;
  if (prev)
    prev->next = m;
  else
    *list = m;
  return m;
}


/* Given the root R of a class tree, step through all subclasses
   recursively, marking functions as virtual that are declared virtual
   in base classes.  */

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static void
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mark_virtual (struct sym *r)
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{
  struct link *p;
  struct member *m, *m2;

  for (p = r->subs; p; p = p->next)
    {
      for (m = r->fns; m; m = m->next)
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        if (has_flag (m->flags, F_VIRTUAL))
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          {
            for (m2 = p->sym->fns; m2; m2 = m2->next)
              if (m->param_hash == m2->param_hash && streq (m->name, m2->name))
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                set_flag (&m2->flags, F_VIRTUAL);
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          }

      mark_virtual (p->sym);
    }
}


/* For all roots of the class tree, mark functions as virtual that
   are virtual because of a virtual declaration in a base class.  */

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static void
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mark_inherited_virtual (void)
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{
  struct sym *r;
  int i;

  for (i = 0; i < TABLE_SIZE; ++i)
    for (r = class_table[i]; r; r = r->next)
      if (r->supers == NULL)
        mark_virtual (r);
}


/* Create and return a symbol for a namespace with name NAME.  */

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static struct sym *
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make_namespace (char *name, struct sym *context)
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{
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  struct sym *s = xmalloc (FLEXSIZEOF (struct sym, name, strlen (name) + 1));
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  memset (s, 0, offsetof (struct sym, name));
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  strcpy (s->name, name);
  s->next = all_namespaces;
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  s->namesp = context;
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  all_namespaces = s;
  return s;
}


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/* Find the symbol for namespace NAME.  If not found, return NULL */
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static struct sym *
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check_namespace (char *name, struct sym *context)
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{
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  struct sym *p = NULL;
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  for (p = all_namespaces; p; p = p->next)
    {
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      if (streq (p->name, name) && (p->namesp == context))
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	    break;
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    }
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  return p;
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}
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/* Find the symbol for namespace NAME.  If not found, add a new symbol
   for NAME to all_namespaces.  */

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static struct sym *
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find_namespace (char *name, struct sym *context)
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{
  struct sym *p = check_namespace (name, context);

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  if (p == NULL)
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    p = make_namespace (name, context);
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  return p;
}
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/* Find namespace alias with name NAME. If not found return NULL. */

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static struct link *
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check_namespace_alias (char *name)
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{
  struct link *p = NULL;
  struct alias *al;
  unsigned h;
  char *s;

  for (s = name, h = 0; *s; ++s)
    h = (h << 1) ^ *s;
  h %= TABLE_SIZE;

  for (al = namespace_alias_table[h]; al; al = al->next)
    if (streq (name, al->name) && (al->namesp == current_namespace))
      {
        p = al->aliasee;
        break;
      }

  return p;
}

/* Register the name NEW_NAME as an alias for namespace list OLD_NAME.  */
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static void
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register_namespace_alias (char *new_name, struct link *old_name)
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{
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  unsigned h;
  char *s;
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  struct alias *al;

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  for (s = new_name, h = 0; *s; ++s)
    h = (h << 1) ^ *s;
  h %= TABLE_SIZE;


  /* Is it already in the table of aliases?  */
  for (al = namespace_alias_table[h]; al; al = al->next)
    if (streq (new_name, al->name) && (al->namesp == current_namespace))
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      return;

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  al = xmalloc (FLEXSIZEOF (struct alias, name, strlen (new_name) + 1));
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  strcpy (al->name, new_name);
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  al->next = namespace_alias_table[h];
  al->namesp = current_namespace;
  al->aliasee = old_name;
  namespace_alias_table[h] = al;
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}


/* Enter namespace with name NAME.  */

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static void
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enter_namespace (char *name)
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{
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  struct sym *p = find_namespace (name, current_namespace);
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  if (namespace_sp == namespace_stack_size)
    {
      int size = max (10, 2 * namespace_stack_size);
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      namespace_stack
	= (struct sym **) xrealloc ((void *)namespace_stack,
				    size * sizeof *namespace_stack);
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      namespace_stack_size = size;
    }
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  namespace_stack[namespace_sp++] = current_namespace;
  current_namespace = p;
}


/* Leave the current namespace.  */

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static void
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leave_namespace (void)
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{
  assert (namespace_sp > 0);
  current_namespace = namespace_stack[--namespace_sp];
}



/***********************************************************************
		       Writing the Output File
 ***********************************************************************/

/* Write string S to the output file FP in a Lisp-readable form.
   If S is null, write out `()'.  */

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static void
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putstr (const char *s, FILE *fp)
{
  if (!s)
    {
      putc ('(', fp);
      putc (')', fp);
      putc (' ', fp);
    }
  else
    {
      putc ('"', fp);
      fputs (s, fp);
      putc ('"', fp);
      putc (' ', fp);
    }
}
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/* A dynamically allocated buffer for constructing a scope name.  */

char *scope_buffer;
int scope_buffer_size;
int scope_buffer_len;


/* Make sure scope_buffer has enough room to add LEN chars to it.  */

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static void
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ensure_scope_buffer_room (int len)
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{
  if (scope_buffer_len + len >= scope_buffer_size)
    {
      int new_size = max (2 * scope_buffer_size, scope_buffer_len + len);
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      scope_buffer = (char *) xrealloc (scope_buffer, new_size);
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      scope_buffer_size = new_size;
    }
}


/* Recursively add the scope names of symbol P and the scopes of its
   namespaces to scope_buffer.  Value is a pointer to the complete
   scope name constructed.  */

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static char *
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sym_scope_1 (struct sym *p)
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{
  int len;
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  if (p->namesp)
    sym_scope_1 (p->namesp);

  if (*scope_buffer)
    {
      ensure_scope_buffer_room (3);
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      strcpy (scope_buffer + scope_buffer_len, "::");
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      scope_buffer_len += 2;
    }

  len = strlen (p->name);
  ensure_scope_buffer_room (len + 1);
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  strcpy (scope_buffer + scope_buffer_len, p->name);
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  scope_buffer_len += len;
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  if (has_flag (p->flags, F_TEMPLATE))
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    {
      ensure_scope_buffer_room (3);
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      strcpy (scope_buffer + scope_buffer_len, "<>");
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      scope_buffer_len += 2;
    }
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  return scope_buffer;
}


/* Return the scope of symbol P in printed representation, i.e.
   as it would appear in a C*+ source file.  */

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static char *
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sym_scope (struct sym *p)
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{
  if (!scope_buffer)
    {
      scope_buffer_size = 1024;
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      scope_buffer = (char *) xmalloc (scope_buffer_size);
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    }
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  *scope_buffer = '\0';
  scope_buffer_len = 0;
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  if (p->namesp)
    sym_scope_1 (p->namesp);

  return scope_buffer;
}


/* Dump the list of members M to file FP.  Value is the length of the
   list.  */

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static int
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dump_members (FILE *fp, struct member *m)
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{
  int n;

  putc ('(', fp);

  for (n = 0; m; m = m->next, ++n)
    {
      fputs (MEMBER_STRUCT, fp);
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      putstr (m->name, fp);
      putstr (NULL, fp);		/* FIXME? scope for globals */
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      fprintf (fp, "%u ", (unsigned) m->flags);
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      putstr (m->filename, fp);
      putstr (m->regexp, fp);
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      fprintf (fp, "%u ", (unsigned) m->pos);
      fprintf (fp, "%u ", (unsigned) m->vis);
      putc (' ', fp);
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      putstr (m->def_filename, fp);
      putstr (m->def_regexp, fp);
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      fprintf (fp, "%u", (unsigned) m->def_pos);
      putc (']', fp);
      putc ('\n', fp);
    }

  putc (')', fp);
  putc ('\n', fp);
  return n;
}


/* Dump class ROOT to stream FP.  */

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static void
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dump_sym (FILE *fp, struct sym *root)
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{
  fputs (CLASS_STRUCT, fp);
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  putstr (root->name, fp);
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  /* Print scope, if any.  */
  if (root->namesp)
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    putstr (sym_scope (root), fp);
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  else
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    putstr (NULL, fp);
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  /* Print flags.  */
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  fprintf (fp, "%d", root->flags);
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  putstr (root->filename, fp);
  putstr (root->regexp, fp);
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  fprintf (fp, "%u", (unsigned) root->pos);
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  putstr (root->sfilename, fp);
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  putc (']', fp);
  putc ('\n', fp);
}


/* Dump class ROOT and its subclasses to file FP.  Value is the
   number of classes written.  */

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static int
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dump_tree (FILE *fp, struct sym *root)
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{
  struct link *lk;
  unsigned n = 0;

  dump_sym (fp, root);

  if (f_verbose)
    {
      putchar ('+');
      fflush (stdout);
    }

  putc ('(', fp);

  for (lk = root->subs; lk; lk = lk->next)
    {
      fputs (TREE_STRUCT, fp);
      n += dump_tree (fp, lk->sym);
      putc (']', fp);
    }

  putc (')', fp);

  dump_members (fp, root->vars);
  n += dump_members (fp, root->fns);
  dump_members (fp, root->static_vars);
  n += dump_members (fp, root->static_fns);
  n += dump_members (fp, root->friends);
  dump_members (fp, root->types);

  /* Superclasses.  */
  putc ('(', fp);
  putc (')', fp);

  /* Mark slot.  */
  putc ('(', fp);
  putc (')', fp);

  putc ('\n', fp);
  return n;
}


/* Dump the entire class tree to file FP.  */

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static void
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dump_roots (FILE *fp)
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{
  int i, n = 0;
  struct sym *r;

  /* Output file header containing version string, command line
     options etc.  */
  if (!f_append)
    {
      fputs (TREE_HEADER_STRUCT, fp);
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      putstr (EBROWSE_FILE_VERSION, fp);
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      putc ('\"', fp);
      if (!f_structs)
	fputs (" -s", fp);
      if (f_regexps)
	fputs (" -x", fp);
      putc ('\"', fp);
      fputs (" ()", fp);
      fputs (" ()", fp);
      putc (']', fp);
    }

  /* Mark functions as virtual that are so because of functions
     declared virtual in base classes.  */
  mark_inherited_virtual ();

  /* Dump the roots of the graph.  */
  for (i = 0; i < TABLE_SIZE; ++i)
    for (r = class_table[i]; r; r = r->next)
      if (!r->supers)
        {
	  fputs (TREE_STRUCT, fp);
          n += dump_tree (fp, r);
	  putc (']', fp);
        }

  if (f_verbose)
    putchar ('\n');
}



/***********************************************************************
				Scanner
 ***********************************************************************/

#ifdef DEBUG
#define INCREMENT_LINENO 			\
do {						\
  if (f_very_verbose)				\
    {						\
      ++yyline;					\
      printf ("%d:\n", yyline);			\
    }						\
  else						\
    ++yyline;					\
} while (0)
#else
#define INCREMENT_LINENO	++yyline
#endif

/* Define two macros for accessing the input buffer (current input
   file).  GET(C) sets C to the next input character and advances the
   input pointer.  UNGET retracts the input pointer.  */

#define GET(C)	((C) = *in++)
#define UNGET() (--in)


/* Process a preprocessor line.  Value is the next character from the
   input buffer not consumed.  */

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static int
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process_pp_line (void)
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{
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  int in_comment = 0, in_string = 0;
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  int c;
  char *p = yytext;

  /* Skip over white space.  The `#' has been consumed already.  */
  while (WHITEP (GET (c)))
    ;

  /* Read the preprocessor command (if any).  */
  while (IDENTP (c))
    {
      *p++ = c;
      GET (c);
    }

  /* Is it a `define'?  */
  *p = '\0';

  if (*yytext && streq (yytext, "define"))
    {
      p = yytext;
      while (WHITEP (c))
	GET (c);
      while (IDENTP (c))
	{
	  *p++ = c;
	  GET (c);
	}

      *p = '\0';

      if (*yytext)
	{
	  char *regexp = matching_regexp ();
	  int pos = BUFFER_POS ();
	  add_define (yytext, regexp, pos);
	}
    }
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  while (c && (c != '\n' || in_comment || in_string))
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    {
      if (c == '\\')
	GET (c);
      else if (c == '/' && !in_comment)
	{
	  if (GET (c) == '*')
	    in_comment = 1;
	}
      else if (c == '*' && in_comment)
	{
	  if (GET (c) == '/')
	    in_comment = 0;
	}
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      else if (c == '"')
	in_string = !in_string;
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      if (c == '\n')
	INCREMENT_LINENO;

      GET (c);
    }
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  return c;
}


/* Value is the next token from the input buffer.  */

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static int
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yylex (void)
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