parse-gram.c

GNU的词法/语法分析器bison源码

  case 64:
#line 393 "parse-gram.y"
    { grammar_rule_end ((yylsp[0])); }
    break;

  case 65:
#line 394 "parse-gram.y"
    { grammar_rule_end ((yylsp[0])); }
    break;

  case 67:
#line 400 "parse-gram.y"
    { grammar_rule_begin (current_lhs, current_lhs_location); }
    break;

  case 68:
#line 402 "parse-gram.y"
    { grammar_current_rule_symbol_append ((yyvsp[0].symbol), (yylsp[0])); }
    break;

  case 69:
#line 404 "parse-gram.y"
    { grammar_current_rule_action_append ((yyvsp[0].chars), (yylsp[0])); }
    break;

  case 70:
#line 406 "parse-gram.y"
    { grammar_current_rule_prec_set ((yyvsp[0].symbol), (yylsp[0])); }
    break;

  case 71:
#line 408 "parse-gram.y"
    { grammar_current_rule_dprec_set ((yyvsp[0].integer), (yylsp[0])); }
    break;

  case 72:
#line 410 "parse-gram.y"
    { grammar_current_rule_merge_set ((yyvsp[0].uniqstr), (yylsp[0])); }
    break;

  case 73:
#line 414 "parse-gram.y"
    { (yyval.symbol) = (yyvsp[0].symbol); }
    break;

  case 74:
#line 415 "parse-gram.y"
    { (yyval.symbol) = (yyvsp[0].symbol); }
    break;

  case 75:
#line 420 "parse-gram.y"
    { (yyval.chars) = (yyvsp[0].chars); }
    break;

  case 76:
#line 426 "parse-gram.y"
    {
      (yyval.symbol) = symbol_get (quotearg_style (c_quoting_style, (yyvsp[0].chars)), (yylsp[0]));
      symbol_class_set ((yyval.symbol), token_sym, (yylsp[0]));
    }
    break;

  case 77:
#line 435 "parse-gram.y"
    { (yyval.chars) = (yyvsp[0].chars); }
    break;

  case 79:
#line 442 "parse-gram.y"
    {
      muscle_code_grow ("epilogue", (yyvsp[0].chars), (yylsp[0]));
      scanner_last_string_free ();
    }
    break;


      default: break;
    }

/* Line 1126 of yacc.c.  */
#line 1912 "parse-gram.c"

  yyvsp -= yylen;
  yyssp -= yylen;
  yylsp -= yylen;

  YY_STACK_PRINT (yyss, yyssp);

  *++yyvsp = yyval;
  *++yylsp = yyloc;

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

  goto yynewstate;


/*------------------------------------.
| yyerrlab -- here on detecting error |
`------------------------------------*/
yyerrlab:
  /* If not already recovering from an error, report this error.  */
  if (!yyerrstatus)
    {
      ++yynerrs;
#if YYERROR_VERBOSE
      yyn = yypact[yystate];

      if (YYPACT_NINF < yyn && yyn < YYLAST)
	{
	  int yytype = YYTRANSLATE (yychar);
	  YYSIZE_T yysize0 = yytnamerr (0, yytname[yytype]);
	  YYSIZE_T yysize = yysize0;
	  YYSIZE_T yysize1;
	  int yysize_overflow = 0;
	  char *yymsg = 0;
#	  define YYERROR_VERBOSE_ARGS_MAXIMUM 5
	  char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];
	  int yyx;

#if 0
	  /* This is so xgettext sees the translatable formats that are
	     constructed on the fly.  */
	  YY_("syntax error, unexpected %s");
	  YY_("syntax error, unexpected %s, expecting %s");
	  YY_("syntax error, unexpected %s, expecting %s or %s");
	  YY_("syntax error, unexpected %s, expecting %s or %s or %s");
	  YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s");
#endif
	  char *yyfmt;
	  char const *yyf;
	  static char const yyunexpected[] = "syntax error, unexpected %s";
	  static char const yyexpecting[] = ", expecting %s";
	  static char const yyor[] = " or %s";
	  char yyformat[sizeof yyunexpected
			+ sizeof yyexpecting - 1
			+ ((YYERROR_VERBOSE_ARGS_MAXIMUM - 2)
			   * (sizeof yyor - 1))];
	  char const *yyprefix = yyexpecting;

	  /* Start YYX at -YYN if negative to avoid negative indexes in
	     YYCHECK.  */
	  int yyxbegin = yyn < 0 ? -yyn : 0;

	  /* Stay within bounds of both yycheck and yytname.  */
	  int yychecklim = YYLAST - yyn;
	  int yyxend = yychecklim < YYNTOKENS ? yychecklim : YYNTOKENS;
	  int yycount = 1;

	  yyarg[0] = yytname[yytype];
	  yyfmt = yystpcpy (yyformat, yyunexpected);

	  for (yyx = yyxbegin; yyx < yyxend; ++yyx)
	    if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR)
	      {
		if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
		  {
		    yycount = 1;
		    yysize = yysize0;
		    yyformat[sizeof yyunexpected - 1] = '\0';
		    break;
		  }
		yyarg[yycount++] = yytname[yyx];
		yysize1 = yysize + yytnamerr (0, yytname[yyx]);
		yysize_overflow |= yysize1 < yysize;
		yysize = yysize1;
		yyfmt = yystpcpy (yyfmt, yyprefix);
		yyprefix = yyor;
	      }

	  yyf = YY_(yyformat);
	  yysize1 = yysize + yystrlen (yyf);
	  yysize_overflow |= yysize1 < yysize;
	  yysize = yysize1;

	  if (!yysize_overflow && yysize <= YYSTACK_ALLOC_MAXIMUM)
	    yymsg = (char *) YYSTACK_ALLOC (yysize);
	  if (yymsg)
	    {
	      /* Avoid sprintf, as that infringes on the user's name space.
		 Don't have undefined behavior even if the translation
		 produced a string with the wrong number of "%s"s.  */
	      char *yyp = yymsg;
	      int yyi = 0;
	      while ((*yyp = *yyf))
		{
		  if (*yyp == '%' && yyf[1] == 's' && yyi < yycount)
		    {
		      yyp += yytnamerr (yyp, yyarg[yyi++]);
		      yyf += 2;
		    }
		  else
		    {
		      yyp++;
		      yyf++;
		    }
		}
	      yyerror (yymsg);
	      YYSTACK_FREE (yymsg);
	    }
	  else
	    {
	      yyerror (YY_("syntax error"));
	      goto yyexhaustedlab;
	    }
	}
      else
#endif /* YYERROR_VERBOSE */
	yyerror (YY_("syntax error"));
    }

  yyerror_range[0] = yylloc;

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

      if (yychar <= YYEOF)
        {
	  /* Return failure if at end of input.  */
	  if (yychar == YYEOF)
	    YYABORT;
        }
      else
	{
	  yydestruct ("Error: discarding", yytoken, &yylval, &yylloc);
	  yychar = YYEMPTY;
	}
    }

  /* Else will try to reuse look-ahead token after shifting the error
     token.  */
  goto yyerrlab1;


/*---------------------------------------------------.
| yyerrorlab -- error raised explicitly by YYERROR.  |
`---------------------------------------------------*/
yyerrorlab:

  /* Pacify compilers like GCC when the user code never invokes
     YYERROR and the label yyerrorlab therefore never appears in user
     code.  */
  if (0)
     goto yyerrorlab;

  yyerror_range[0] = yylsp[1-yylen];
  yylsp -= yylen;
  yyvsp -= yylen;
  yyssp -= yylen;
  yystate = *yyssp;
  goto yyerrlab1;


/*-------------------------------------------------------------.
| yyerrlab1 -- common code for both syntax error and YYERROR.  |
`-------------------------------------------------------------*/
yyerrlab1:
  yyerrstatus = 3;	/* Each real token shifted decrements this.  */

  for (;;)
    {
      yyn = yypact[yystate];
      if (yyn != YYPACT_NINF)
	{
	  yyn += YYTERROR;
	  if (0 <= yyn && yyn <= YYLAST && yycheck[yyn] == YYTERROR)
	    {
	      yyn = yytable[yyn];
	      if (0 < yyn)
		break;
	    }
	}

      /* Pop the current state because it cannot handle the error token.  */
      if (yyssp == yyss)
	YYABORT;

      yyerror_range[0] = *yylsp;
      yydestruct ("Error: popping", yystos[yystate], yyvsp, yylsp);
      YYPOPSTACK;
      yystate = *yyssp;
      YY_STACK_PRINT (yyss, yyssp);
    }

  if (yyn == YYFINAL)
    YYACCEPT;

  *++yyvsp = yylval;

  yyerror_range[1] = yylloc;
  /* Using YYLLOC is tempting, but would change the location of
     the look-ahead.  YYLOC is available though. */
  YYLLOC_DEFAULT (yyloc, yyerror_range - 1, 2);
  *++yylsp = yyloc;

  /* Shift the error token. */
  YY_SYMBOL_PRINT ("Shifting", yystos[yyn], yyvsp, yylsp);

  yystate = yyn;
  goto yynewstate;


/*-------------------------------------.
| yyacceptlab -- YYACCEPT comes here.  |
`-------------------------------------*/
yyacceptlab:
  yyresult = 0;
  goto yyreturn;

/*-----------------------------------.
| yyabortlab -- YYABORT comes here.  |
`-----------------------------------*/
yyabortlab:
  yyresult = 1;
  goto yyreturn;

#ifndef yyoverflow
/*-------------------------------------------------.
| yyexhaustedlab -- memory exhaustion comes here.  |
`-------------------------------------------------*/
yyexhaustedlab:
  yyerror (YY_("memory exhausted"));
  yyresult = 2;
  /* Fall through.  */
#endif

yyreturn:
  if (yychar != YYEOF && yychar != YYEMPTY)
     yydestruct ("Cleanup: discarding lookahead",
		 yytoken, &yylval, &yylloc);
  while (yyssp != yyss)
    {
      yydestruct ("Cleanup: popping",
		  yystos[*yyssp], yyvsp, yylsp);
      YYPOPSTACK;
    }
#ifndef yyoverflow
  if (yyss != yyssa)
    YYSTACK_FREE (yyss);
#endif
  return yyresult;
}


#line 448 "parse-gram.y"



/* Return the location of the left-hand side of a rule whose
   right-hand side is RHS[1] ... RHS[N].  Ignore empty nonterminals in
   the right-hand side, and return an empty location equal to the end
   boundary of RHS[0] if the right-hand side is empty.  */

static YYLTYPE
lloc_default (YYLTYPE const *rhs, int n)
{
  int i;
  YYLTYPE loc;

  /* SGI MIPSpro 7.4.1m miscompiles "loc.start = loc.end = rhs[n].end;".
     The bug is fixed in 7.4.2m, but play it safe for now.  */
  loc.start = rhs[n].end;
  loc.end = rhs[n].end;

  /* Ignore empty nonterminals the start of the the right-hand side.
     Do not bother to ignore them at the end of the right-hand side,
     since empty nonterminals have the same end as their predecessors.  */
  for (i = 1; i <= n; i++)
    if (! equal_boundaries (rhs[i].start, rhs[i].end))
      {
	loc.start = rhs[i].start;
	break;
      }

  return loc;
}


/* Add a lex-param or a parse-param (depending on TYPE) with
   declaration DECL and location LOC.  */

static void
add_param (char const *type, char *decl, location loc)
{
  static char const alphanum[26 + 26 + 1 + 10] =
    "abcdefghijklmnopqrstuvwxyz"
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    "_"
    "0123456789";
  char const *name_start = NULL;
  char *p;

  /* Stop on last actual character.  */
  for (p = decl; p[1]; p++)
    if ((p == decl
	 || ! memchr (alphanum, p[-1], sizeof alphanum))
	&& memchr (alphanum, p[0], sizeof alphanum - 10))
      name_start = p;

  /* Strip the surrounding '{' and '}', and any blanks just inside
     the braces.  */
  while (*--p == ' ' || *p == '\t')
    continue;
  p[1] = '\0';
  while (*++decl == ' ' || *decl == '\t')
    continue;

  if (! name_start)
    complain_at (loc, _("missing identifier in parameter declaration"));
  else
    {
      char *name;
      size_t name_len;

      for (name_len = 1;
	   memchr (alphanum, name_start[name_len], sizeof alphanum);
	   name_len++)
	continue;

      name = xmalloc (name_len + 1);
      memcpy (name, name_start, name_len);
      name[name_len] = '\0';
      muscle_pair_list_grow (type, decl, name);
      free (name);
    }

  scanner_last_string_free ();
}

static void
gram_error (location const *loc, char const *msg)
{
  complain_at (*loc, "%s", msg);
}

char const *
token_name (int type)
{
  return yytname[YYTRANSLATE (type)];
}