bison.cc

C++版 词法分析、语法分析器

  register char *f = from;
  register char *t = to;
  register int i = count;

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

int
#ifdef YY_USE_CLASS
 YY_@_CLASS::
#endif
     YY_@_PARSE(YY_@_PARSE_PARAM)
#ifndef __STDC__
#ifndef __cplusplus
#ifndef YY_USE_CLASS
/* parameter definition without protypes */
YY_@_PARSE_PARAM_DEF
#endif
#endif
#endif
{
  register int yystate;
  register int yyn;
  register short *yyssp;
  register YY_@_STYPE *yyvsp;
  int yyerrstatus;      /*  number of tokens to shift before error messages enabled */
  int yychar1=0;          /*  lookahead token as an internal (translated) token number */

  short yyssa[YYINITDEPTH];     /*  the state stack                     */
  YY_@_STYPE yyvsa[YYINITDEPTH];        /*  the semantic value stack            */

  short *yyss = yyssa;          /*  refer to the stacks thru separate pointers */
  YY_@_STYPE *yyvs = yyvsa;     /*  to allow yyoverflow to reallocate them elsewhere */

#ifdef YY_@_LSP_NEEDED
  YY_@_LTYPE yylsa[YYINITDEPTH];        /*  the location stack                  */
  YY_@_LTYPE *yyls = yylsa;
  YY_@_LTYPE *yylsp;

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

  int yystacksize = YYINITDEPTH;

#ifdef YY_@_PURE
  int YY_@_CHAR;
  YY_@_STYPE YY_@_LVAL;
  int YY_@_NERRS;
#ifdef YY_@_LSP_NEEDED
  YY_@_LTYPE YY_@_LLOC;
#endif
#endif

  YY_@_STYPE yyval;             /*  the variable used to return         */
				/*  semantic values from the action     */
				/*  routines                            */

  int yylen;
/* start loop, in which YYGOTO may be used. */
YYBEGINGOTO

#if YY_@_DEBUG != 0
  if (YY_@_DEBUG_FLAG)
    fprintf(stderr, "Starting parse\n");
#endif
  yystate = 0;
  yyerrstatus = 0;
  YY_@_NERRS = 0;
  YY_@_CHAR = 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 YY_@_LSP_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.  */
YYLABEL(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. */
      YY_@_STYPE *yyvs1 = yyvs;
      short *yyss1 = yyss;
#ifdef YY_@_LSP_NEEDED
      YY_@_LTYPE *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 YY_@_LSP_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 YY_@_LSP_NEEDED
      yyls = yyls1;
#endif
#else /* no yyoverflow */
      /* Extend the stack our own way.  */
      if (yystacksize >= YYMAXDEPTH)
	{
	  YY_@_ERROR("parser stack overflow");
	  __ALLOCA_return(2);
	}
      yystacksize *= 2;
      if (yystacksize > YYMAXDEPTH)
	yystacksize = YYMAXDEPTH;
      yyss = (short *) __ALLOCA_alloca (yystacksize * sizeof (*yyssp));
      __yy_bcopy ((char *)yyss1, (char *)yyss, size * sizeof (*yyssp));
      __ALLOCA_free(yyss1,yyssa);
      yyvs = (YY_@_STYPE *) __ALLOCA_alloca (yystacksize * sizeof (*yyvsp));
      __yy_bcopy ((char *)yyvs1, (char *)yyvs, size * sizeof (*yyvsp));
      __ALLOCA_free(yyvs1,yyvsa);
#ifdef YY_@_LSP_NEEDED
      yyls = (YY_@_LTYPE *) __ALLOCA_alloca (yystacksize * sizeof (*yylsp));
      __yy_bcopy ((char *)yyls1, (char *)yyls, size * sizeof (*yylsp));
      __ALLOCA_free(yyls1,yylsa);
#endif
#endif /* no yyoverflow */

      yyssp = yyss + size - 1;
      yyvsp = yyvs + size - 1;
#ifdef YY_@_LSP_NEEDED
      yylsp = yyls + size - 1;
#endif

#if YY_@_DEBUG != 0
      if (YY_@_DEBUG_FLAG)
	fprintf(stderr, "Stack size increased to %d\n", yystacksize);
#endif

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

#if YY_@_DEBUG != 0
  if (YY_@_DEBUG_FLAG)
    fprintf(stderr, "Entering state %d\n", yystate);
#endif

  YYGOTO(yybackup);
YYLABEL(yybackup)

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

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

  yyn = yypact[yystate];
  if (yyn == YYFLAG)
    YYGOTO(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 (YY_@_CHAR == YYEMPTY)
    {
#if YY_@_DEBUG != 0
      if (YY_@_DEBUG_FLAG)
	fprintf(stderr, "Reading a token: ");
#endif
      YY_@_CHAR = YYLEX;
    }

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

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

#if YY_@_DEBUG != 0
      if (YY_@_DEBUG_FLAG)
	fprintf(stderr, "Now at end of input.\n");
#endif
    }
  else
    {
      yychar1 = YYTRANSLATE(YY_@_CHAR);

#if YY_@_DEBUG != 0
      if (YY_@_DEBUG_FLAG)
	{
	  fprintf (stderr, "Next token is %d (%s", YY_@_CHAR, yytname[yychar1]);
	  /* Give the individual parser a way to print the precise meaning
	     of a token, for further debugging info.  */
#ifdef YYPRINT
	  YYPRINT (stderr, YY_@_CHAR, YY_@_LVAL);
#endif
	  fprintf (stderr, ")\n");
	}
#endif
    }

  yyn += yychar1;
  if (yyn < 0 || yyn > YYLAST || yycheck[yyn] != yychar1)
    YYGOTO(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)
	YYGOTO(yyerrlab);
      yyn = -yyn;
      YYGOTO(yyreduce);
    }
  else if (yyn == 0)
    YYGOTO(yyerrlab);

  if (yyn == YYFINAL)
    YYACCEPT;

  /* Shift the lookahead token.  */

#if YY_@_DEBUG != 0
  if (YY_@_DEBUG_FLAG)
    fprintf(stderr, "Shifting token %d (%s), ", YY_@_CHAR, yytname[yychar1]);
#endif

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

  *++yyvsp = YY_@_LVAL;
#ifdef YY_@_LSP_NEEDED
  *++yylsp = YY_@_LLOC;
#endif

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

  yystate = yyn;
  YYGOTO(yynewstate);

/* Do the default action for the current state.  */
YYLABEL(yydefault)

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

/* Do a reduction.  yyn is the number of a rule to reduce with.  */
YYLABEL(yyreduce)
  yylen = yyr2[yyn];
  if (yylen > 0)
    yyval = yyvsp[1-yylen]; /* implement default value of the action */

#if YY_@_DEBUG != 0
  if (YY_@_DEBUG_FLAG)
    {
      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  */
  yyvsp -= yylen;
  yyssp -= yylen;
#ifdef YY_@_LSP_NEEDED
  yylsp -= yylen;
#endif

#if YY_@_DEBUG != 0
  if (YY_@_DEBUG_FLAG)
    {
      short *ssp1 = yyss - 1;
      fprintf (stderr, "state stack now");
      while (ssp1 != yyssp)
	fprintf (stderr, " %d", *++ssp1);
      fprintf (stderr, "\n");
    }
#endif

  *++yyvsp = yyval;

#ifdef YY_@_LSP_NEEDED
  yylsp++;
  if (yylen == 0)
    {
      yylsp->first_line = YY_@_LLOC.first_line;
      yylsp->first_column = YY_@_LLOC.first_column;
      yylsp->last_line = (yylsp-1)->last_line;
      yylsp->last_column = (yylsp-1)->last_column;
      yylsp->text = 0;
    }
  else
    {
      yylsp->last_line = (yylsp+yylen-1)->last_line;
      yylsp->last_column = (yylsp+yylen-1)->last_column;
    }
#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];

  YYGOTO(yynewstate);

YYLABEL(yyerrlab)   /* here on detecting error */

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

#ifdef YY_@_ERROR_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++;
	  msg = (char *) malloc(size + 15);
	  if (msg != 0)
	    {
	      strcpy(msg, "parse error");

	      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++;
		      }
		}
	      YY_@_ERROR(msg);
	      free(msg);
	    }
	  else
	    YY_@_ERROR ("parse error; also virtual memory exceeded");
	}
      else
#endif /* YY_@_ERROR_VERBOSE */
	YY_@_ERROR("parse error");
    }

  YYGOTO(yyerrlab1);
YYLABEL(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 (YY_@_CHAR == YYEOF)
	YYABORT;

#if YY_@_DEBUG != 0
      if (YY_@_DEBUG_FLAG)
	fprintf(stderr, "Discarding token %d (%s).\n", YY_@_CHAR, yytname[yychar1]);
#endif

      YY_@_CHAR = YYEMPTY;
    }

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

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

  YYGOTO(yyerrhandle);

YYLABEL(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) YYGOTO(yydefault);
#endif

YYLABEL(yyerrpop)   /* pop the current state because it cannot handle the error token */

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

#if YY_@_DEBUG != 0
  if (YY_@_DEBUG_FLAG)
    {
      short *ssp1 = yyss - 1;
      fprintf (stderr, "Error: state stack now");
      while (ssp1 != yyssp)
	fprintf (stderr, " %d", *++ssp1);
      fprintf (stderr, "\n");
    }
#endif

YYLABEL(yyerrhandle)

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

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

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

  if (yyn == YYFINAL)
    YYACCEPT;

#if YY_@_DEBUG != 0
  if (YY_@_DEBUG_FLAG)
    fprintf(stderr, "Shifting error token, ");
#endif

  *++yyvsp = YY_@_LVAL;
#ifdef YY_@_LSP_NEEDED
  *++yylsp = YY_@_LLOC;
#endif

  yystate = yyn;
  YYGOTO(yynewstate);
/* end loop, in which YYGOTO may be used. */
  YYENDGOTO
}

/* END */
$ /* section 3 */

/* AFTER END , NEVER READ !!! */