[bison.git] / src / bison.simple

/* -*-C-*-  Note some compilers choke on comments on `#line' lines.  */
#line
/* This file comes from bison-@bison_version@.  */

/* Skeleton output parser for bison,
   Copyright (C) 1984, 1989, 1990 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/* As a special exception, when this file is copied by Bison into a
   Bison output file, you may use that output file without restriction.
   This special exception was added by the Free Software Foundation
   in version 1.24 of Bison.  */

/* This is the parser code that is written into each bison parser
  when the %semantic_parser declaration is not specified in the grammar.
  It was written by Richard Stallman by simplifying the hairy parser
  used when %semantic_parser is specified.  */

#ifndef YYSTACK_USE_ALLOCA
# ifdef alloca
#  define YYSTACK_USE_ALLOCA
# else /* alloca not defined */
#  ifdef __GNUC__
#   define YYSTACK_USE_ALLOCA
#   define alloca __builtin_alloca
#  else /* not GNU C.  */
#   if (!defined (__STDC__) && defined (sparc)) || defined (__sparc__) || defined (__sparc) || defined (__sgi) || (defined (__sun) && defined (__i386))
#    define YYSTACK_USE_ALLOCA
#    include <alloca.h>
#   else /* not sparc */
     /* We think this test detects Watcom and Microsoft C.  */
     /* This used to test MSDOS, but that is a bad idea since that
        symbol is in the user namespace.  */
#    if (defined (_MSDOS) || defined (_MSDOS_)) && !defined (__TURBOC__)
#     if 0
       /* No need for malloc.h, which pollutes the namespace; instead,
          just don't use alloca.  */
#      include <malloc.h>
#     endif
#    else /* not MSDOS, or __TURBOC__ */
#     if defined(_AIX)
       /* I don't know what this was needed for, but it pollutes the
          namespace.  So I turned it off.  rms, 2 May 1997.  */
       /* #include <malloc.h>  */
 #pragma alloca
#      define YYSTACK_USE_ALLOCA
#     else /* not MSDOS, or __TURBOC__, or _AIX */
#      if 0
        /* haible@ilog.fr says this works for HPUX 9.05 and up, and on
           HPUX 10.  Eventually we can turn this on.  */
#       ifdef __hpux
#        define YYSTACK_USE_ALLOCA
#        define alloca __builtin_alloca
#       endif /* __hpux */
#      endif
#     endif /* not _AIX */
#    endif /* not MSDOS, or __TURBOC__ */
#   endif /* not sparc */
#  endif /* not GNU C */
# endif /* alloca not defined */
#endif /* YYSTACK_USE_ALLOCA not defined */

#ifdef YYSTACK_USE_ALLOCA
# define YYSTACK_ALLOC alloca
#else
# define YYSTACK_ALLOC malloc
#endif

/* Note: there must be only one dollar sign in this file.
   It is replaced by the list of actions, each action
   as one case of the switch.  */

#define yyerrok         (yyerrstatus = 0)
#define yyclearin       (yychar = YYEMPTY)
#define YYEMPTY         -2
#define YYEOF           0
#define YYACCEPT        goto yyacceptlab
#define YYABORT         goto yyabortlab
#define YYERROR         goto yyerrlab1
/* Like YYERROR except do call yyerror.
   This remains here temporarily to ease the
   transition to the new meaning of YYERROR, for GCC.
   Once GCC version 2 has supplanted version 1, this can go.  */
#define YYFAIL          goto yyerrlab
#define YYRECOVERING()  (!!yyerrstatus)
#define YYBACKUP(token, value) \
do                                                              \
  if (yychar == YYEMPTY && yylen == 1)                          \
    { yychar = (token), yylval = (value);                       \
      yychar1 = YYTRANSLATE (yychar);                           \
      YYPOPSTACK;                                               \
      goto yybackup;                                            \
    }                                                           \
  else                                                          \
    { yyerror ("syntax error: cannot back up"); YYERROR; }      \
while (0)

#define YYTERROR        1
#define YYERRCODE       256

#ifndef YYPURE
# define YYLEX          yylex()
#endif

#ifdef YYPURE
# ifdef YYLSP_NEEDED
#  ifdef YYLEX_PARAM
#   define YYLEX                yylex(&yylval, &yylloc, YYLEX_PARAM)
#  else
#   define YYLEX                yylex(&yylval, &yylloc)
#  endif
# else /* not YYLSP_NEEDED */
#  ifdef YYLEX_PARAM
#   define YYLEX                yylex(&yylval, YYLEX_PARAM)
#  else
#   define YYLEX                yylex(&yylval)
#  endif
# endif /* not YYLSP_NEEDED */
#endif

/* If nonreentrant, generate the variables here. */

#ifndef YYPURE
/* The lookahead symbol.  */
int     yychar;

/* The semantic value of the lookahead symbol. */
YYSTYPE yylval;

# ifdef YYLSP_NEEDED
/* Location data for the lookahead symbol.  */
YYLTYPE yylloc;
# endif

/* Number of parse errors so far.  */
int yynerrs;
#endif  /* not YYPURE */


#if YYDEBUG != 0
int yydebug;                    /*  nonzero means print parse trace     */

  /* [The following comment makes no sense to me.  Could someone
     clarify it?  --akim] Since this is uninitialized, it does not
     stop multiple parsers from coexisting.  */
#else
  /* To avoid crippling this file with `#if YYDEBUG', define `yydebug'
     as `0', so that the `if (yydebug)' be removed as dead code.  */
# define yydebug 0
#endif

/*  YYINITDEPTH indicates the initial size of the parser's stacks       */

#ifndef YYINITDEPTH
# define YYINITDEPTH 200
#endif

/*  YYMAXDEPTH is the maximum size the stacks can grow to
    (effective only if the built-in stack extension method is used).  */

#if YYMAXDEPTH == 0
# undef YYMAXDEPTH
#endif

#ifndef YYMAXDEPTH
# define YYMAXDEPTH 10000
#endif
\f
/* Define __yy_memcpy.  Note that the size argument
   should be passed with type unsigned int, because that is what the non-GCC
   definitions require.  With GCC, __builtin_memcpy takes an arg
   of type size_t, but it can handle unsigned int.  */

#if __GNUC__ > 1                /* GNU C and GNU C++ define this.  */
# define __yy_memcpy(TO,FROM,COUNT)     __builtin_memcpy(TO,FROM,COUNT)
#else                           /* not GNU C or C++ */
# ifndef __cplusplus

/* This is the most reliable way to avoid incompatibilities
   in available built-in functions on various systems.  */
static void
__yy_memcpy (to, from, count)
     char *to;
     char *from;
     unsigned int count;
{
  register char *f = from;
  register char *t = to;
  register int i = count;

  while (i-- > 0)
    *t++ = *f++;
}

# else /* __cplusplus */

/* This is the most reliable way to avoid incompatibilities
   in available built-in functions on various systems.  */
static void
__yy_memcpy (char *to, char *from, unsigned int count)
{
  register char *t = to;
  register char *f = from;
  register int i = count;

  while (i-- > 0)
    *t++ = *f++;
}

# endif
#endif
\f
#line

/* The user can define YYPARSE_PARAM as the name of an argument to be passed
   into yyparse.  The argument should have type void *.
   It should actually point to an object.
   Grammar actions can access the variable by casting it
   to the proper pointer type.  */

#ifdef YYPARSE_PARAM
# ifdef __cplusplus
#  define YYPARSE_PARAM_ARG void *YYPARSE_PARAM
#  define YYPARSE_PARAM_DECL
# else /* not __cplusplus */
#  define YYPARSE_PARAM_ARG YYPARSE_PARAM
#  define YYPARSE_PARAM_DECL void *YYPARSE_PARAM;
# endif /* not __cplusplus */
#else /* not YYPARSE_PARAM */
# define YYPARSE_PARAM_ARG
# define YYPARSE_PARAM_DECL
#endif /* not YYPARSE_PARAM */

/* Prevent warning if -Wstrict-prototypes.  */
#ifdef __GNUC__
# ifdef YYPARSE_PARAM
int yyparse (void *);
# else
int yyparse (void);
# endif
#endif

int
yyparse(YYPARSE_PARAM_ARG)
     YYPARSE_PARAM_DECL
{
  register int yystate;
  register int yyn;
  /* Number of tokens to shift before error messages enabled.  */
  int yyerrstatus;
  /* Lookahead token as an internal (translated) token number.  */
  int yychar1 = 0;

  /* Three stacks and their tools:
     `yyss': related to states,
     `yysv': related to semantic values,
     `yyls': related to locations.

     Refer to the stacks thru separate pointers, to allow yyoverflow
     to reallocate them elsewhere.  */

  /* The state stack. */
  short yyssa[YYINITDEPTH];
  short *yyss = yyssa;
  register short *yyssp;

  /* The semantic value stack.  */
  YYSTYPE yyvsa[YYINITDEPTH];
  YYSTYPE *yyvs = yyvsa;
  register YYSTYPE *yyvsp;

#ifdef YYLSP_NEEDED
  /* The location stack.  */
  YYLTYPE yylsa[YYINITDEPTH];
  YYLTYPE *yyls = yylsa;
  YYLTYPE *yylsp;
#endif

#ifdef YYLSP_NEEDED
# define YYPOPSTACK   (yyvsp--, yyssp--, yylsp--)
#else
# define YYPOPSTACK   (yyvsp--, yyssp--)
#endif

  int yystacksize = YYINITDEPTH;
  int yyfree_stacks = 0;

#ifdef YYPURE
  int yychar;
  YYSTYPE yylval;
  int yynerrs;
# ifdef YYLSP_NEEDED
  YYLTYPE yylloc;
# endif
#endif


  /* The variables used to return semantic value and location from the
     action routines.  */
  YYSTYPE yyval;
# ifdef YYLSP_NEEDED
  YYLTYPE yyloc;
# endif

  /* When reducing, the number of symbols on the RHS of the reduced
     rule. */
  int yylen;

  if (yydebug)
    fprintf (stderr, "Starting parse\n");

  yystate = 0;
  yyerrstatus = 0;
  yynerrs = 0;
  yychar = YYEMPTY;             /* Cause a token to be read.  */

  /* Initialize stack pointers.
     Waste one element of value and location stack
     so that they stay on the same level as the state stack.
     The wasted elements are never initialized.  */

  yyssp = yyss - 1;
  yyvsp = yyvs;
#ifdef YYLSP_NEEDED
  yylsp = yyls;
#endif

/* Push a new state, which is found in  yystate  .  */
/* In all cases, when you get here, the value and location stacks
   have just been pushed. so pushing a state here evens the stacks.  */
yynewstate:

  *++yyssp = yystate;

  if (yyssp >= yyss + yystacksize - 1)
    {
      /* Give user a chance to reallocate the stack */
      /* Use copies of these so that the &'s don't force the real ones into memory. */
      YYSTYPE *yyvs1 = yyvs;
      short *yyss1 = yyss;
#ifdef YYLSP_NEEDED
      YYLTYPE *yyls1 = yyls;
#endif

      /* Get the current used size of the three stacks, in elements.  */
      int size = yyssp - yyss + 1;

#ifdef yyoverflow
      /* Each stack pointer address is followed by the size of
         the data in use in that stack, in bytes.  */
# ifdef YYLSP_NEEDED
      /* This used to be a conditional around just the two extra args,
         but that might be undefined if yyoverflow is a macro.  */
      yyoverflow ("parser stack overflow",
                  &yyss1, size * sizeof (*yyssp),
                  &yyvs1, size * sizeof (*yyvsp),
                  &yyls1, size * sizeof (*yylsp),
                  &yystacksize);
# else
      yyoverflow ("parser stack overflow",
                  &yyss1, size * sizeof (*yyssp),
                  &yyvs1, size * sizeof (*yyvsp),
                  &yystacksize);
# endif

      yyss = yyss1; yyvs = yyvs1;
# ifdef YYLSP_NEEDED
      yyls = yyls1;
# endif
#else /* no yyoverflow */
      /* Extend the stack our own way.  */
      if (yystacksize >= YYMAXDEPTH)
        {
          yyerror("parser stack overflow");
          if (yyfree_stacks)
            {
              free (yyss);
              free (yyvs);
# ifdef YYLSP_NEEDED
              free (yyls);
# endif
            }
          return 2;
        }
      yystacksize *= 2;
      if (yystacksize > YYMAXDEPTH)
        yystacksize = YYMAXDEPTH;
# ifndef YYSTACK_USE_ALLOCA
      yyfree_stacks = 1;
# endif
      yyss = (short *) YYSTACK_ALLOC (yystacksize * sizeof (*yyssp));
      __yy_memcpy ((char *)yyss, (char *)yyss1,
                   size * (unsigned int) sizeof (*yyssp));
      yyvs = (YYSTYPE *) YYSTACK_ALLOC (yystacksize * sizeof (*yyvsp));
      __yy_memcpy ((char *)yyvs, (char *)yyvs1,
                   size * (unsigned int) sizeof (*yyvsp));
# ifdef YYLSP_NEEDED
      yyls = (YYLTYPE *) YYSTACK_ALLOC (yystacksize * sizeof (*yylsp));
      __yy_memcpy ((char *)yyls, (char *)yyls1,
                   size * (unsigned int) sizeof (*yylsp));
# endif
#endif /* no yyoverflow */

      yyssp = yyss + size - 1;
      yyvsp = yyvs + size - 1;
#ifdef YYLSP_NEEDED
      yylsp = yyls + size - 1;
#endif

      if (yydebug)
        fprintf (stderr, "Stack size increased to %d\n", yystacksize);

      if (yyssp >= yyss + yystacksize - 1)
        YYABORT;
    }

  if (yydebug)
    fprintf (stderr, "Entering state %d\n", yystate);

  goto yybackup;
 yybackup:

/* Do appropriate processing given the current state.  */
/* Read a lookahead token if we need one and don't already have one.  */
/* yyresume: */

  /* First try to decide what to do without reference to lookahead token.  */

  yyn = yypact[yystate];
  if (yyn == YYFLAG)
    goto yydefault;

  /* Not known => get a lookahead token if don't already have one.  */

  /* yychar is either YYEMPTY or YYEOF
     or a valid token in external form.  */

  if (yychar == YYEMPTY)
    {
      if (yydebug)
        fprintf (stderr, "Reading a token: ");
      yychar = YYLEX;
    }

  /* Convert token to internal form (in yychar1) for indexing tables with */

  if (yychar <= 0)              /* This means end of input. */
    {
      yychar1 = 0;
      yychar = YYEOF;           /* Don't call YYLEX any more */

      if (yydebug)
        fprintf (stderr, "Now at end of input.\n");
    }
  else
    {
      yychar1 = YYTRANSLATE(yychar);

      if (yydebug)
        {
          fprintf (stderr, "Next token is %d (%s", yychar, yytname[yychar1]);
          /* Give the individual parser a way to print the precise meaning
             of a token, for further debugging info.  */
# ifdef YYPRINT
          YYPRINT (stderr, yychar, yylval);
# endif
          fprintf (stderr, ")\n");
        }
    }

  yyn += yychar1;
  if (yyn < 0 || yyn > YYLAST || yycheck[yyn] != yychar1)
    goto yydefault;

  yyn = yytable[yyn];

  /* yyn is what to do for this token type in this state.
     Negative => reduce, -yyn is rule number.
     Positive => shift, yyn is new state.
       New state is final state => don't bother to shift,
       just return success.
     0, or most negative number => error.  */

  if (yyn < 0)
    {
      if (yyn == YYFLAG)
        goto yyerrlab;
      yyn = -yyn;
      goto yyreduce;
    }
  else if (yyn == 0)
    goto yyerrlab;

  if (yyn == YYFINAL)
    YYACCEPT;

  /* Shift the lookahead token.  */

  if (yydebug)
    fprintf (stderr, "Shifting token %d (%s), ", yychar, yytname[yychar1]);

  /* Discard the token being shifted unless it is eof.  */
  if (yychar != YYEOF)
    yychar = YYEMPTY;

  *++yyvsp = yylval;
#ifdef YYLSP_NEEDED
  *++yylsp = yylloc;
#endif

  /* count tokens shifted since error; after three, turn off error status.  */
  if (yyerrstatus) yyerrstatus--;

  yystate = yyn;
  goto yynewstate;

/* Do the default action for the current state.  */
yydefault:

  yyn = yydefact[yystate];
  if (yyn == 0)
    goto yyerrlab;

/* Do a reduction.  yyn is the number of a rule to reduce with.  */
yyreduce:
  yylen = yyr2[yyn];
  /* Implement default value of the action:
     `{dollar}{dollar} = {dollar}1'. */
  if (yylen > 0)
      yyval = yyvsp[1-yylen];
#ifdef YYLSP_NEEDED
  /* Implement default location.  If the rhs is empty, extend YYLOC to
     YYLLOC, which corresponds to the current token, otherwise
     implement `@{dollar} = Starts at @1, ends at @YYLEN'.  */
  if (yylen > 0)
    {
      yyloc = yylsp[1-yylen];
      yyloc.last_line = yylsp[0].last_line;
      yyloc.last_column = yylsp[0].last_column;
    }
  else
    {
      yyloc.last_line = yylsp[0].last_line;
      yyloc.last_column = yylsp[0].last_column;
      yyloc.text = 0;
    }
#endif

#if YYDEBUG
  /* We have to keep this `#if YYDEBUG', since we use variables which
     are defined only if `YYDEBUG' is set.  */
  if (yydebug)
    {
      int i;

      fprintf (stderr, "Reducing via rule %d (line %d), ",
               yyn, yyrline[yyn]);

      /* Print the symbols being reduced, and their result.  */
      for (i = yyprhs[yyn]; yyrhs[i] > 0; i++)
        fprintf (stderr, "%s ", yytname[yyrhs[i]]);
      fprintf (stderr, " -> %s\n", yytname[yyr1[yyn]]);
    }
#endif
$   /* the action file gets copied in in place of this dollarsign */
#line
\f
  yyvsp -= yylen;
  yyssp -= yylen;
#ifdef YYLSP_NEEDED
  yylsp -= yylen;
#endif

  if (yydebug)
    {
      short *ssp1 = yyss - 1;
      fprintf (stderr, "state stack now");
      while (ssp1 != yyssp)
        fprintf (stderr, " %d", *++ssp1);
      fprintf (stderr, "\n");
    }

  *++yyvsp = yyval;
#ifdef YYLSP_NEEDED
  *++yylsp = yyloc;
#endif

  /* Now `shift' the result of the reduction.  Determine what state
     that goes to, based on the state we popped back to and the rule
     number reduced by.  */

  yyn = yyr1[yyn];

  yystate = yypgoto[yyn - YYNTBASE] + *yyssp;
  if (yystate >= 0 && yystate <= YYLAST && yycheck[yystate] == *yyssp)
    yystate = yytable[yystate];
  else
    yystate = yydefgoto[yyn - YYNTBASE];

  goto yynewstate;

yyerrlab:   /* here on detecting error */

  if (! yyerrstatus)
    /* If not already recovering from an error, report this error.  */
    {
      ++yynerrs;

#ifdef YYERROR_VERBOSE
      yyn = yypact[yystate];

      if (yyn > YYFLAG && yyn < YYLAST)
        {
          int size = 0;
          char *msg;
          int x, count;

          count = 0;
          /* Start X at -yyn if nec to avoid negative indexes in yycheck.  */
          for (x = (yyn < 0 ? -yyn : 0);
               x < (sizeof(yytname) / sizeof(char *)); x++)
            if (yycheck[x + yyn] == x)
              size += strlen(yytname[x]) + 15, count++;
          size += strlen ("parse error, unexpected `") + 1;
          size += strlen (yytname[YYTRANSLATE (yychar)]);
          msg = (char *) malloc (size);
          if (msg != 0)
            {
              strcpy (msg, "parse error, unexpected `");
              strcat (msg, yytname[YYTRANSLATE (yychar)]);
              strcat (msg, "'");

              if (count < 5)
                {
                  count = 0;
                  for (x = (yyn < 0 ? -yyn : 0);
                       x < (sizeof(yytname) / sizeof(char *)); x++)
                    if (yycheck[x + yyn] == x)
                      {
                        strcat (msg, count == 0 ? ", expecting `" : " or `");
                        strcat (msg, yytname[x]);
                        strcat (msg, "'");
                        count++;
                      }
                }
              yyerror (msg);
              free (msg);
            }
          else
            yyerror ("parse error; also virtual memory exceeded");
        }
      else
#endif /* YYERROR_VERBOSE */
        yyerror ("parse error");
    }

  goto yyerrlab1;
yyerrlab1:   /* here on error raised explicitly by an action */

  if (yyerrstatus == 3)
    {
      /* if just tried and failed to reuse lookahead token after an error, discard it.  */

      /* return failure if at end of input */
      if (yychar == YYEOF)
        YYABORT;

      if (yydebug)
        fprintf (stderr, "Discarding token %d (%s).\n",
                 yychar, yytname[yychar1]);

      yychar = YYEMPTY;
    }

  /* Else will try to reuse lookahead token
     after shifting the error token.  */

  yyerrstatus = 3;              /* Each real token shifted decrements this */

  goto yyerrhandle;

yyerrdefault:  /* current state does not do anything special for the error token. */

#if 0
  /* This is wrong; only states that explicitly want error tokens
     should shift them.  */
  yyn = yydefact[yystate];  /* If its default is to accept any token, ok.  Otherwise pop it.*/
  if (yyn) goto yydefault;
#endif

yyerrpop:   /* pop the current state because it cannot handle the error token */

  if (yyssp == yyss) YYABORT;
  yyvsp--;
  yystate = *--yyssp;
#ifdef YYLSP_NEEDED
  yylsp--;
#endif

  if (yydebug)
    {
      short *ssp1 = yyss - 1;
      fprintf (stderr, "Error: state stack now");
      while (ssp1 != yyssp)
        fprintf (stderr, " %d", *++ssp1);
      fprintf (stderr, "\n");
    }

yyerrhandle:

  yyn = yypact[yystate];
  if (yyn == YYFLAG)
    goto yyerrdefault;

  yyn += YYTERROR;
  if (yyn < 0 || yyn > YYLAST || yycheck[yyn] != YYTERROR)
    goto yyerrdefault;

  yyn = yytable[yyn];
  if (yyn < 0)
    {
      if (yyn == YYFLAG)
        goto yyerrpop;
      yyn = -yyn;
      goto yyreduce;
    }
  else if (yyn == 0)
    goto yyerrpop;

  if (yyn == YYFINAL)
    YYACCEPT;

  if (yydebug)
    fprintf (stderr, "Shifting error token, ");

  *++yyvsp = yylval;
#ifdef YYLSP_NEEDED
  *++yylsp = yylloc;
#endif

  yystate = yyn;
  goto yynewstate;

 yyacceptlab:
  /* YYACCEPT comes here.  */
  if (yyfree_stacks)
    {
      free (yyss);
      free (yyvs);
#ifdef YYLSP_NEEDED
      free (yyls);
#endif
    }
  return 0;

 yyabortlab:
  /* YYABORT comes here.  */
  if (yyfree_stacks)
    {
      free (yyss);
      free (yyvs);
#ifdef YYLSP_NEEDED
      free (yyls);
#endif
    }
  return 1;
}