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

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Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
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              2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
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              Free Software Foundation, Inc.

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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

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
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */

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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

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#include <stdio.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif

#ifdef HAVE_STRING_H
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#include <string.h>
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#endif

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#include <ctype.h>
#include <assert.h>
#include "getopt.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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/* Conditionalize function prototypes.  */

#ifdef PROTOTYPES		/* From config.h.  */
#define P_(x) x
#else
#define P_(x) ()
#endif

/* Value is non-zero if strings X and Y compare equal.  */

#define streq(X, Y) (*(X) == *(Y) && strcmp ((X) + 1, (Y) + 1) == 0)

/* The ubiquitous `max' and `min' macros.  */

#ifndef max
#define max(X, Y)	((X) > (Y) ? (X) : (Y))
#define min(X, Y)	((X) < (Y) ? (X) : (Y))
#endif

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

#define READ_CHUNK_SIZE (100 * 1024)

/* The character used as a separator in path lists (like $PATH).  */

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#if defined(__MSDOS__)
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#define PATH_LIST_SEPARATOR ';'
#define FILENAME_EQ(X,Y)    (strcasecmp(X,Y) == 0)
#else
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#if defined(WINDOWSNT)
#define PATH_LIST_SEPARATOR ';'
#define FILENAME_EQ(X,Y)    (stricmp(X,Y) == 0)
#else
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#define PATH_LIST_SEPARATOR ':'
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#define FILENAME_EQ(X,Y)    (streq(X,Y))
#endif
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#endif
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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 BROWSE_STRUCT		"[ebrowse-bs "
#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.  */

/* Two macros to set and test a bit in an int.  */

#define SET_FLAG(F, FLAG)	((F) |= (FLAG))
#define HAS_FLAG(F, FLAG)	(((F) & (FLAG)) != 0)

/* 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.  */
  char *filename;		/* Don't free this shared string.  */
  int pos;			/* Buffer position of occurrence.  */
  char *def_regexp;		/* Regular expression matching definition.  */
  char *def_filename;		/* File name of definition.  */
  int def_pos;			/* Buffer position of definition.  */
  char name[1];			/* Member name.  */
};

/* 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[1];			/* Alias name.  */
};

/* 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.  */
  char *filename;		/* File in which it can be found.  */
  char *sfilename;		/* File in which members can be found.  */
  struct sym *namesp;		/* Namespace in which defined. .  */
  char name[1];                 /* Name of the class.  */
};

/* 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.  */

char *filename;

/* 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;
int inbuffer_size;

/* 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
{
  char *name;			/* Spelling.  */
  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.  */

int yylex P_ ((void));
void yyparse P_ ((void));
void re_init_parser P_ ((void));
char *token_string P_ ((int));
char *matching_regexp P_ ((void));
void init_sym P_ ((void));
struct sym *add_sym P_ ((char *, struct sym *));
void add_link P_ ((struct sym *, struct sym *));
void add_member_defn P_ ((struct sym *, char *, char *,
			  int, unsigned, int, int, int));
void add_member_decl P_ ((struct sym *, char *, char *, int,
			  unsigned, int, int, int, int));
void dump_roots P_ ((FILE *));
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void *xmalloc P_ ((int));
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void xfree P_ ((void *));
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void add_global_defn P_ ((char *, char *, int, unsigned, int, int, int));
void add_global_decl P_ ((char *, char *, int, unsigned, int, int, int));
void add_define P_ ((char *, char *, int));
void mark_inherited_virtual P_ ((void));
void leave_namespace P_ ((void));
void enter_namespace P_ ((char *));
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void register_namespace_alias P_ ((char *, struct link *));
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void insert_keyword P_ ((char *, int));
void re_init_scanner P_ ((void));
void init_scanner P_ ((void));
void usage P_ ((int));
void version P_ ((void));
void process_file P_ ((char *));
void add_search_path P_ ((char *));
FILE *open_file P_ ((char *));
int process_pp_line P_ ((void));
int dump_members P_ ((FILE *, struct member *));
void dump_sym P_ ((FILE *, struct sym *));
int dump_tree P_ ((FILE *, struct sym *));
struct member *find_member P_ ((struct sym *, char *, int, int, unsigned));
struct member *add_member P_ ((struct sym *, char *, int, int, unsigned));
void mark_virtual P_ ((struct sym *));
void mark_virtual P_ ((struct sym *));
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struct sym *make_namespace P_ ((char *, struct sym *));
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char *sym_scope P_ ((struct sym *));
char *sym_scope_1 P_ ((struct sym *));
int skip_to P_ ((int));
void skip_matching P_ ((void));
void member P_ ((struct sym *, int));
void class_body P_ ((struct sym *, int));
void class_definition P_ ((struct sym *, int, int, int));
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void declaration P_ ((int));
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unsigned parm_list P_ ((int *));
char *operator_name P_ ((int *));
struct sym *parse_classname P_ ((void));
struct sym *parse_qualified_ident_or_type P_ ((char **));
void parse_qualified_param_ident_or_type P_ ((char **));
int globals P_ ((int));
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void yyerror P_ ((char *, char *));
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void usage P_ ((int)) NO_RETURN;
void version P_ (()) NO_RETURN;
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/***********************************************************************
			      Utilities
 ***********************************************************************/

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

void
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yyerror (format, s)
     char *format, *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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void *
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xmalloc (nbytes)
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     int nbytes;
{
  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.  */

void *
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xrealloc (p, sz)
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     void *p;
     int sz;
{
  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.  */

char *
xstrdup (s)
     char *s;
{
  if (s)
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    s = 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*').  */

void
init_sym ()
{
  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.  */

struct sym *
add_sym (name, nested_in_class)
     char *name;
     struct sym *nested_in_class;
{
  struct sym *sym;
  unsigned h;
  char *s;
  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 = (struct sym *) xmalloc (sizeof *sym + strlen (name));
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      bzero (sym, sizeof *sym);
      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.  */

void
add_link (super, sub)
     struct sym *super, *sub;
{
  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.  */

struct member *
find_member (cls, name, var, sc, hash)
     struct sym *cls;
     char *name;
     int var, sc;
     unsigned hash;
{
  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).  */

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

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

void
add_define (name, regexp, pos)
     char *name, *regexp;
     int pos;
{
  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).  */

void
add_global_defn (name, regexp, pos, hash, var, sc, flags)
     char *name, *regexp;
     int pos;
     unsigned hash;
     int var;
     int sc;
     int flags;
{
  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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void
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add_global_decl (name, regexp, pos, hash, var, sc, flags)
     char *name, *regexp;
     int pos;
     unsigned hash;
     int var;
     int sc;
     int flags;
{
  /* 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.  */

struct member *
add_member (cls, name, var, sc, hash)
     struct sym *cls;
     char *name;
     int var;
     int sc;
     unsigned hash;
{
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  struct member *m = (struct member *) xmalloc (sizeof *m + strlen (name));
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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.  */

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

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

      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.  */

void
mark_inherited_virtual ()
{
  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.  */

struct sym *
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make_namespace (name, context)
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     char *name;
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     struct sym *context;
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{
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  struct sym *s = (struct sym *) xmalloc (sizeof *s + strlen (name));
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  bzero (s, sizeof *s);
  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, retrun NULL */
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struct sym *
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check_namespace (name, context)
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     char *name;
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     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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  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.  */

struct sym *
find_namespace (name, context)
     char *name;
     struct sym *context;
{
  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. */

struct link *
check_namespace_alias (name)
    char *name;
{
  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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void
register_namespace_alias (new_name, old_name)
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     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 = (struct alias *) xmalloc (sizeof *al + strlen (new_name));
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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.  */

void
enter_namespace (name)
     char *name;
{
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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.  */

void
leave_namespace ()
{
  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 `()'.  */

#define PUTSTR(s, fp)				\
  do {						\
    if (!s)					\
      {						\
        putc ('(', fp);				\
        putc (')', fp);				\
        putc (' ', fp);				\
      }						\
    else					\
      {						\
        putc ('"', fp);				\
        fputs (s, fp);				\
        putc ('"', fp);				\
        putc (' ', fp);				\
      }						\
   } while (0)

/* 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.  */

void
ensure_scope_buffer_room (len)
     int len;
{
  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.  */

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

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

  len = strlen (p->name);
  ensure_scope_buffer_room (len + 1);
  strcat (scope_buffer, p->name);
  scope_buffer_len += len;
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  if (HAS_FLAG (p->flags, F_TEMPLATE))
    {
      ensure_scope_buffer_room (3);
      strcat (scope_buffer, "<>");
      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.  */

char *
sym_scope (p)
     struct sym *p;
{
  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.  */

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

  putc ('(', fp);

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

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


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

int
dump_tree (fp, root)
     FILE *fp;
     struct sym *root;
{
  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.  */

void
dump_roots (fp)
     FILE *fp;
{
  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);
      PUTSTR (EBROWSE_FILE_VERSION, fp);

      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.  */

int
process_pp_line ()
{
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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.  */

int
yylex ()
{
  int c;
  char end_char;
  char *p;

  for (;;)
    {
      while (WHITEP (GET (c)))
        ;

      switch (c)
        {
        case '\n':
          INCREMENT_LINENO;
          break;

        case '\r':
          break;

        case 0:
          /* End of file.  */
          return YYEOF;

        case '\\':
          GET (c);
          break;

        case '"':
        case '\'':
          /* String and character constants.  */
          end_char = c;
          string_start = in;
          while (GET (c) && c != end_char)
            {
              switch (c)
                {
                case '\\':
                  /* Escape sequences.  */
                  if (!GET (c))
                    {
                      if (end_char == '\'')
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                        yyerror ("EOF in character constant", NULL);
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                      else
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                        yyerror ("EOF in string constant", NULL);
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                      goto end_string;
                    }
                  else switch (c)
                    {
                    case '\n':
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		      INCREMENT_LINENO;
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                    case 'a':
                    case 'b':
                    case 'f':
                    case 'n':
                    case 'r':
                    case 't':
                    case 'v':
                      break;

                    case 'x':
                      {
                        /* Hexadecimal escape sequence.  */
                        int i;
                        for (i = 0; i < 2; ++i)
                          {
                            GET (c);

                            if (c >= '0' && c <= '7')
                              ;
                            else if (c >= 'a' && c <= 'f')
                              ;
                            else if (c >= 'A' && c <= 'F')
                              ;
                            else
                              {
                                UNGET ();
                                break;
                              }
                          }
                      }
                      break;

                    case '0':
                      {
                        /* Octal escape sequence.  */
                        int i;
                        for (i = 0; i < 3; ++i)
                          {
                            GET (c);

                            if (c >= '0' && c <= '7')
                              ;
                            else
                              {
                                UNGET ();
                                break;
                              }
                          }
                      }
                      break;

                    default:
                      break;
                    }
                  break;

                case '\n':
                  if (end_char == '\'')
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                    yyerror ("newline in character constant", NULL);
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                  else
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                    yyerror ("newline in string constant", NULL);
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                  INCREMENT_LINENO;
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                  break;
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                default:
                  break;
                }
            }

        end_string:
          return end_char == '\'' ? CCHAR : CSTRING;

        case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': case 'g':
        case 'h': case 'i': case 'j': case 'k': case 'l': case 'm': case 'n':
        case 'o': case 'p': case 'q': case 'r': case 's': case 't': case 'u':
        case 'v': case 'w': case 'x': case 'y': case 'z':
        case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': case 'G':
        case 'H': case 'I': case 'J': case 'K': case 'L': case 'M': case 'N':
        case 'O': case 'P': case 'Q': case 'R': case 'S': case 'T': case 'U':
        case 'V': case 'W': case 'X': case 'Y': case 'Z': case '_':
          {
            /* Identifier and keywords.  */
            unsigned hash;
            struct kw *k;

            p = yytext;
            *p++ = hash = c;

            while (IDENTP (GET (*p)))
	      {
		hash = (hash << 1) ^ *p++;
		if (p == yytext_end - 1)
		  {
		    int size = yytext_end - yytext;
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		    yytext = (char *) xrealloc (yytext, 2 * size);
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		    yytext_end = yytext + 2 * size;
		    p = yytext + size - 1;
		  }
	      }

            UNGET ();
            *p = 0;

            for (k = keyword_table[hash % KEYWORD_TABLE_SIZE]; k; k = k->next)
              if (streq (k->name, yytext))
                return k->tk;

            return IDENT;
          }

        case '/':
          /* C and C++ comments, '/' and '/='.  */
          switch (GET (c))
            {
            case '*':
              while (GET (c))
                {
                  switch (c)
                    {
                    case '*':
                      if (GET (c) == '/')
                        goto comment_end;
                      UNGET ();
                      break;
                    case '\\':
                      GET (c);
                      break;
                    case '\n':
                      INCREMENT_LINENO;
                      break;
                    }
                }
            comment_end:;
              break;

            case '=':
              return DIVASGN;

            case '/':
	      while (GET (c) && c != '\n')
		;
	      INCREMENT_LINENO;
	      break;

            default:
              UNGET ();
              return '/';
            }
          break;

        case '+':
          if (GET (c) == '+')
            return INC;
          else if (c == '=')
            return ADDASGN;
          UNGET ();
          return '+';

        case '-':
          switch (GET (c))
            {
            case '-':
              return DEC;
            case '>':
              if (GET (c) == '*')
                return ARROWSTAR;
              UNGET ();
              return ARROW;
            case '=':
              return SUBASGN;
            }
          UNGET ();
          return '-';

        case '*':
          if (GET (c) == '=')
            return MULASGN;
          UNGET ();
          return '*';

        case '%':
          if (GET (c) == '=')
            return MODASGN;
          UNGET ();
          return '%';

        case '|':
          if (GET (c) == '|')
            return LOR;
          else if (c == '=')
            return ORASGN;
          UNGET ();
          return '|';

        case '&':
          if (GET (c) == '&')
            return LAND;
          else if (c == '=')
            return ANDASGN;
          UNGET ();
          return '&';

        case '^':
          if (GET (c) == '=')
            return XORASGN;
          UNGET ();
          return '^';

        case '.':
          if (GET (c) == '*')
            return POINTSTAR;
          else if (c == '.')
            {
              if (GET (c) != '.')
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                yyerror ("invalid token '..' ('...' assumed)", NULL);
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              UNGET ();
              return ELLIPSIS;
            }
          else if (!DIGITP (c))
            {
              UNGET ();
              return '.';
            }
          goto mantissa;

        case ':':
          if (GET (c) == ':')
            return DCOLON;
          UNGET ();
          return ':';

        case '=':
          if (GET (c) == '=')
            return EQ;
          UNGET ();
          return '=';

        case '!':
          if (GET (c) == '=')
            return NE;
          UNGET ();
          return '!';

        case '<':
          switch (GET (c))
            {
            case '=':
              return LE;
            case '<':
              if (GET (c) == '=')
                return LSHIFTASGN;
              UNGET ();
              return LSHIFT;
            }
          UNGET ();
          return '<';

        case '>':
          switch (GET (c))
            {
            case '=':
              return GE;
            case '>':
              if (GET (c) == '=')
                return RSHIFTASGN;
              UNGET ();
              return RSHIFT;
            }
          UNGET ();
          return '>';

        case '#':
          c = process_pp_line ();
          if (c == 0)
            return YYEOF;
          break;

        case '(': case ')': case '[': case ']': case '{': case '}':
        case ';': case ',': case '?': case '~':
          return c;

        case '0':
          yyival = 0;

          if (GET (c) == 'x' || c == 'X')
            {
              while (GET (c))
                {
                  if (DIGITP (c))
                    yyival = yyival * 16 + c - '0';
                  else if (c >= 'a' && c <= 'f')
                    yyival = yyival * 16 + c - 'a' + 10;
                  else if (c >= 'A' && c <= 'F')
                    yyival = yyival * 16 + c - 'A' + 10;
                  else
                    break;
                }

              goto int_suffixes;
            }
          else if (c == '.')
            goto mantissa;

          while (c >= '0' && c <= '7')
            {
              yyival = (yyival << 3) + c - '0';
              GET (c);
            }

        int_suffixes:
          /* Integer suffixes.  */
          while (isalpha (c))
            GET (c);
          UNGET ();
          return CINT;

        case '1': case '2': case '3': case '4': case '5': case '6':
        case '7': case '8': case '9':
          /* Integer or floating constant, part before '.'.  */
          yyival = c - '0';

          while (GET (c) && DIGITP (c))
            yyival = 10 * yyival + c - '0';

          if (c != '.')
            goto int_suffixes;

        mantissa:
          /* Digits following '.'.  */
          while (DIGITP (c))
            GET (c);

          /* Optional exponent.  */
          if (c == 'E' || c == 'e')
            {
              if (GET (c) == '-' || c == '+')
                GET (c);

              while (DIGITP (c))
                GET (c);
            }

          /* Optional type suffixes.  */
          while (isalpha (c))
            GET (c);
	  UNGET ();
          return CFLOAT;

        default:
          break;
        }
    }
}


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/* Actually local to matching_regexp.  These variables must be in
   global scope for the case that `static' get's defined away.  */

static char *matching_regexp_buffer, *matching_regexp_end_buf;


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/* Value is the string from the start of the line to the current
   position in the input buffer, or maybe a bit more if that string is
   shorter than min_regexp.  */

char *
matching_regexp ()
{
  char *p;
  char *s;
  char *t;

  if (!f_regexps)
    return NULL;

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  if (matching_regexp_buffer == NULL)
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    {
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      matching_regexp_buffer = (char *) xmalloc (max_regexp);
      matching_regexp_end_buf = &matching_regexp_buffer[max_regexp] - 1;
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    }

  /* Scan back to previous newline of buffer start.  */
  for (p = in - 1; p > inbuffer && *p != '\n'; --p)
    ;

  if (*p == '\n')
    {
      while (in - p < min_regexp && p > inbuffer)
        {
          /* Line probably not significant enough */
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          for (--p; p > inbuffer && *p != '\n'; --p)
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            ;
        }
      if (*p == '\n')
        ++p;
    }

  /* Copy from end to make sure significant portions are included.
     This implies that in the browser a regular expressing of the form
     `^.*{regexp}' has to be used.  */
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  for (s = matching_regexp_end_buf - 1, t = in;
       s > matching_regexp_buffer && t > p;)
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    {
      *--s = *--t;

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      if (*s == '"' || *s == '\\')
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        *--s = '\\';
    }

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  *(matching_regexp_end_buf - 1) = '\0';
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  return xstrdup (s);
}


/* Return a printable representation of token T.  */

char *
token_string (t)
     int t;
{
  static char b[3];

  switch (t)
    {
    case CSTRING:               return "string constant";
    case CCHAR:                 return "char constant";
    case CINT:                  return "int constant";
    case CFLOAT:                return "floating constant";
    case ELLIPSIS:              return "...";
    case LSHIFTASGN:            return "<<=";
    case RSHIFTASGN:            return ">>=";
    case ARROWSTAR:             return "->*";
    case IDENT:                 return "identifier";
    case DIVASGN:               return "/=";
    case INC:                   return "++";
    case ADDASGN:               return "+=";
    case DEC:                   return "--";
    case ARROW:                 return "->";
    case SUBASGN:               return "-=";
    case MULASGN:               return "*=";
    case MODASGN:               return "%=";
    case LOR:                   return "||";
    case ORASGN:                return "|=";
    case LAND:                  return "&&";
    case ANDASGN:               return "&=";
    case XORASGN:               return "^=";
    case POINTSTAR:             return ".*";
    case DCOLON:                return "::";
    case EQ:                    return "==";
    case NE:                    return "!=";
    case LE:                    return "<=";
    case LSHIFT:                return "<<";
    case GE:                    return ">=";
    case RSHIFT:                return ">>";
    case ASM:                   return "asm";
    case AUTO:                  return "auto";
    case BREAK:                 return "break";
    case CASE:                  return "case";
    case CATCH:                 return "catch";
    case CHAR:                  return "char";
    case CLASS:                 return "class";
    case CONST:                 return "const";
    case CONTINUE:              return "continue";
    case DEFAULT:               return "default";
    case DELETE:                return "delete";
    case DO:                    return "do";
    case DOUBLE:                return "double";
    case ELSE:                  return "else";
    case ENUM:                  return "enum";
    case EXTERN:                return "extern";
    case FLOAT:                 return "float";
    case FOR:                   return "for";
    case FRIEND:                return "friend";
    case GOTO:                  return "goto";
    case IF:                    return "if";
    case T_INLINE:              return "inline";
    case INT:                   return "int";
    case LONG:                  return "long";
    case NEW:                   return "new";
    case OPERATOR:              return "operator";
    case PRIVATE:               return "private";
    case PROTECTED:             return "protected";
    case PUBLIC:                return "public";
    case REGISTER:              return "register";
    case RETURN:                return "return";
    case SHORT:                 return "short";
    case SIGNED:                return "signed";
    case SIZEOF:                return "sizeof";
    case STATIC:                return "static";
    case STRUCT:                return "struct";
    case SWITCH:                return "switch";
    case TEMPLATE:              return "template";
    case THIS:                  return "this";
    case THROW:                 return "throw";
    case TRY:                   return "try";
    case TYPEDEF:               return "typedef";
    case UNION:                 return "union";
    case UNSIGNED:              return "unsigned";
    case VIRTUAL:               return "virtual";
    case VOID:                  return "void";
    case VOLATILE:              return "volatile";
    case WHILE:                 return "while";
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    case MUTABLE:		return "mutable";
    case BOOL:			return "bool";
    case TRUE:			return "true";
    case FALSE:			return "false";
    case SIGNATURE:		return "signature";
    case NAMESPACE:		return "namespace";
    case EXPLICIT:		return "explicit";
    case TYPENAME:		return "typename";
    case CONST_CAST:		return "const_cast";
    case DYNAMIC_CAST:		return "dynamic_cast";
    case REINTERPRET_CAST:	return "reinterpret_cast";
    case STATIC_CAST:		return "static_cast";
    case TYPEID:		return "typeid";
    case USING:			return "using";
    case WCHAR:			return "wchar_t";
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    case YYEOF:                 return "EOF";

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    default:
      if (t < 255)
	{
	  b[0] = t;
	  b[1] = '\0';
	  return b;
	}
      else
	return "???";
    }
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}


/* Reinitialize the scanner for a new input file.  */

void
re_init_scanner ()
{
  in = inbuffer;
  yyline = 1;
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  if (yytext == NULL)
    {
      int size = 256;
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      yytext = (char *) xmalloc (size * sizeof *yytext);
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      yytext_end = yytext + size;
    }
}


/* Insert a keyword NAME with token value TK into the keyword hash
   table.  */

void
insert_keyword (name, tk)
     char *name;
     int tk;
{
  char *s;
  unsigned h = 0;
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  struct kw *k = (struct kw *) xmalloc (sizeof *k);
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  for (s = name; *s; ++s)
    h = (h << 1) ^ *s;

  h %= KEYWORD_TABLE_SIZE;
  k->name = name;
  k->tk = tk;
  k->next = keyword_table[h];
  keyword_table[h] = k;
}


/* Initialize the scanner for the first file.  This sets up the
   character class vectors and fills the keyword hash table.  */

void
init_scanner ()
{
  int i;

  /* Allocate the input buffer */
  inbuffer_size = READ_CHUNK_SIZE + 1;
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  inbuffer = in = (char *) xmalloc (inbuffer_size);
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