usr.bin/yacc/skeleton.c

   1 /*
   2  * Copyright (c) 1989 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Robert Paul Corbett.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)skeleton.c       5.8 (Berkeley) 4/29/95
  37  *
  38  * $FreeBSD: src/usr.bin/yacc/skeleton.c,v 1.28.2.1 2001/07/19 05:46:39 peter Exp $
  39  * $DragonFly: src/usr.bin/yacc/skeleton.c,v 1.6 2006/01/22 13:38:50 swildner Exp $
  40  */
  41
  42 #include "defs.h"
  43
  44 /*  The definition of yysccsid in the banner should be replaced with    */
  45 /*  a #pragma ident directive if the target C compiler supports         */
  46 /*  #pragma ident directives.                                           */
  47 /*                                                                      */
  48 /*  If the skeleton is changed, the banner should be changed so that    */
  49 /*  the altered version can be easily distinguished from the original.  */
  50 /*                                                                      */
  51 /*  The #defines included with the banner are there because they are    */
  52 /*  useful in subsequent code.  The macros #defined in the header or    */
  53 /*  the body either are not useful outside of semantic actions or       */
  54 /*  are conditional.                                                    */
  55
  56 const char *banner[] = {
  57     "#include <stdlib.h>",
  58     "#define YYBYACC 1",
  59     "#define YYMAJOR 1",
  60     "#define YYMINOR 9",
  61     "#define YYLEX yylex()",
  62     "#define YYEMPTY -1",
  63     "#define yyclearin (yychar=(YYEMPTY))",
  64     "#define yyerrok (yyerrflag=0)",
  65     "#define YYRECOVERING() (yyerrflag!=0)",
  66     "#if defined(__cplusplus) || __STDC__",
  67     "static int yygrowstack(void);",
  68     "#else",
  69     "static int yygrowstack();",
  70     "#endif",
  71     NULL
  72 };
  73
  74 const char *tables[] = {
  75     "extern const short yylhs[];",
  76     "extern const short yylen[];",
  77     "extern const short yydefred[];",
  78     "extern const short yydgoto[];",
  79     "extern const short yysindex[];",
  80     "extern const short yyrindex[];",
  81     "extern const short yygindex[];",
  82     "extern const short yytable[];",
  83     "extern const short yycheck[];",
  84     "#if YYDEBUG",
  85     "extern char *yyname[];",
  86     "extern char *yyrule[];",
  87     "#endif",
  88     NULL
  89 };
  90
  91 const char *header[] = {
  92     "#if YYDEBUG",
  93     "#include <stdio.h>",
  94     "#endif",
  95     "#ifdef YYSTACKSIZE",
  96     "#undef YYMAXDEPTH",
  97     "#define YYMAXDEPTH YYSTACKSIZE",
  98     "#else",
  99     "#ifdef YYMAXDEPTH",
 100     "#define YYSTACKSIZE YYMAXDEPTH",
 101     "#else",
 102     "#define YYSTACKSIZE 10000",
 103     "#define YYMAXDEPTH 10000",
 104     "#endif",
 105     "#endif",
 106     "#define YYINITSTACKSIZE 200",
 107     "int yydebug;",
 108     "int yynerrs;",
 109     "int yyerrflag;",
 110     "int yychar;",
 111     "short *yyssp;",
 112     "YYSTYPE *yyvsp;",
 113     "YYSTYPE yyval;",
 114     "YYSTYPE yylval;",
 115     "short *yyss;",
 116     "short *yysslim;",
 117     "YYSTYPE *yyvs;",
 118     "int yystacksize;",
 119     NULL
 120 };
 121
 122 const char *body[] = {
 123     "/* allocate initial stack or double stack size, up to YYMAXDEPTH */",
 124     "static int yygrowstack(void)",
 125     "{",
 126     "    int newsize, i;",
 127     "    short *newss;",
 128     "    YYSTYPE *newvs;",
 129     "",
 130     "    if ((newsize = yystacksize) == 0)",
 131     "        newsize = YYINITSTACKSIZE;",
 132     "    else if (newsize >= YYMAXDEPTH)",
 133     "        return -1;",
 134     "    else if ((newsize *= 2) > YYMAXDEPTH)",
 135     "        newsize = YYMAXDEPTH;",
 136     "    i = yyssp - yyss;",
 137     "    newss = yyss ? (short *)realloc(yyss, newsize * sizeof *newss) :",
 138     "      (short *)malloc(newsize * sizeof *newss);",
 139     "    if (newss == NULL)",
 140     "        return -1;",
 141     "    yyss = newss;",
 142     "    yyssp = newss + i;",
 143     "    newvs = yyvs ? (YYSTYPE *)realloc(yyvs, newsize * sizeof *newvs) :",
 144     "      (YYSTYPE *)malloc(newsize * sizeof *newvs);",
 145     "    if (newvs == NULL)",
 146     "        return -1;",
 147     "    yyvs = newvs;",
 148     "    yyvsp = newvs + i;",
 149     "    yystacksize = newsize;",
 150     "    yysslim = yyss + newsize - 1;",
 151     "    return 0;",
 152     "}",
 153     "",
 154     "#define YYABORT goto yyabort",
 155     "#define YYREJECT goto yyabort",
 156     "#define YYACCEPT goto yyaccept",
 157     "#define YYERROR goto yyerrlab",
 158     "",
 159     "#ifndef YYPARSE_PARAM",
 160     "#if defined(__cplusplus) || __STDC__",
 161     "#define YYPARSE_PARAM_ARG void",
 162     "#define YYPARSE_PARAM_DECL",
 163     "#else      /* ! ANSI-C/C++ */",
 164     "#define YYPARSE_PARAM_ARG",
 165     "#define YYPARSE_PARAM_DECL",
 166     "#endif     /* ANSI-C/C++ */",
 167     "#else      /* YYPARSE_PARAM */",
 168     "#ifndef YYPARSE_PARAM_TYPE",
 169     "#define YYPARSE_PARAM_TYPE void *",
 170     "#endif",
 171     "#if defined(__cplusplus) || __STDC__",
 172     "#define YYPARSE_PARAM_ARG YYPARSE_PARAM_TYPE YYPARSE_PARAM",
 173     "#define YYPARSE_PARAM_DECL",
 174     "#else      /* ! ANSI-C/C++ */",
 175     "#define YYPARSE_PARAM_ARG YYPARSE_PARAM",
 176     "#define YYPARSE_PARAM_DECL YYPARSE_PARAM_TYPE YYPARSE_PARAM;",
 177     "#endif     /* ANSI-C/C++ */",
 178     "#endif     /* ! YYPARSE_PARAM */",
 179     "",
 180     "int",
 181     "yyparse (YYPARSE_PARAM_ARG)",
 182     "    YYPARSE_PARAM_DECL",
 183     "{",
 184     "    int yym, yyn, yystate;",
 185     "#if YYDEBUG",
 186     "    const char *yys;",
 187     "",
 188     "    if ((yys = getenv(\"YYDEBUG\")))",
 189     "    {",
 190     "        yyn = *yys;",
 191     "        if (yyn >= '0' && yyn <= '9')",
 192     "            yydebug = yyn - '0';",
 193     "    }",
 194     "#endif",
 195     "",
 196     "    yynerrs = 0;",
 197     "    yyerrflag = 0;",
 198     "    yychar = (-1);",
 199     "",
 200     "    if (yyss == NULL && yygrowstack()) goto yyoverflow;",
 201     "    yyssp = yyss;",
 202     "    yyvsp = yyvs;",
 203     "    *yyssp = yystate = 0;",
 204     "",
 205     "yyloop:",
 206     "    if ((yyn = yydefred[yystate])) goto yyreduce;",
 207     "    if (yychar < 0)",
 208     "    {",
 209     "        if ((yychar = yylex()) < 0) yychar = 0;",
 210     "#if YYDEBUG",
 211     "        if (yydebug)",
 212     "        {",
 213     "            yys = 0;",
 214     "            if (yychar <= YYMAXTOKEN) yys = yyname[yychar];",
 215     "            if (!yys) yys = \"illegal-symbol\";",
 216     "            printf(\"%sdebug: state %d, reading %d (%s)\\n\",",
 217     "                    YYPREFIX, yystate, yychar, yys);",
 218     "        }",
 219     "#endif",
 220     "    }",
 221     "    if ((yyn = yysindex[yystate]) && (yyn += yychar) >= 0 &&",
 222     "            yyn <= YYTABLESIZE && yycheck[yyn] == yychar)",
 223     "    {",
 224     "#if YYDEBUG",
 225     "        if (yydebug)",
 226     "            printf(\"%sdebug: state %d, shifting to state %d\\n\",",
 227     "                    YYPREFIX, yystate, yytable[yyn]);",
 228     "#endif",
 229     "        if (yyssp >= yysslim && yygrowstack())",
 230     "        {",
 231     "            goto yyoverflow;",
 232     "        }",
 233     "        *++yyssp = yystate = yytable[yyn];",
 234     "        *++yyvsp = yylval;",
 235     "        yychar = (-1);",
 236     "        if (yyerrflag > 0)  --yyerrflag;",
 237     "        goto yyloop;",
 238     "    }",
 239     "    if ((yyn = yyrindex[yystate]) && (yyn += yychar) >= 0 &&",
 240     "            yyn <= YYTABLESIZE && yycheck[yyn] == yychar)",
 241     "    {",
 242     "        yyn = yytable[yyn];",
 243     "        goto yyreduce;",
 244     "    }",
 245     "    if (yyerrflag) goto yyinrecovery;",
 246     "#if defined(lint) || defined(__GNUC__)",
 247     "    goto yynewerror;",
 248     "#endif",
 249     "yynewerror:",
 250     "    yyerror(\"syntax error\");",
 251     "#if defined(lint) || defined(__GNUC__)",
 252     "    goto yyerrlab;",
 253     "#endif",
 254     "yyerrlab:",
 255     "    ++yynerrs;",
 256     "yyinrecovery:",
 257     "    if (yyerrflag < 3)",
 258     "    {",
 259     "        yyerrflag = 3;",
 260     "        for (;;)",
 261     "        {",
 262     "            if ((yyn = yysindex[*yyssp]) && (yyn += YYERRCODE) >= 0 &&",
 263     "                    yyn <= YYTABLESIZE && yycheck[yyn] == YYERRCODE)",
 264     "            {",
 265     "#if YYDEBUG",
 266     "                if (yydebug)",
 267     "                    printf(\"%sdebug: state %d, error recovery shifting\\",
 268     " to state %d\\n\", YYPREFIX, *yyssp, yytable[yyn]);",
 269     "#endif",
 270     "                if (yyssp >= yysslim && yygrowstack())",
 271     "                {",
 272     "                    goto yyoverflow;",
 273     "                }",
 274     "                *++yyssp = yystate = yytable[yyn];",
 275     "                *++yyvsp = yylval;",
 276     "                goto yyloop;",
 277     "            }",
 278     "            else",
 279     "            {",
 280     "#if YYDEBUG",
 281     "                if (yydebug)",
 282     "                    printf(\"%sdebug: error recovery discarding state %d\
 283 \\n\",",
 284     "                            YYPREFIX, *yyssp);",
 285     "#endif",
 286     "                if (yyssp <= yyss) goto yyabort;",
 287     "                --yyssp;",
 288     "                --yyvsp;",
 289     "            }",
 290     "        }",
 291     "    }",
 292     "    else",
 293     "    {",
 294     "        if (yychar == 0) goto yyabort;",
 295     "#if YYDEBUG",
 296     "        if (yydebug)",
 297     "        {",
 298     "            yys = 0;",
 299     "            if (yychar <= YYMAXTOKEN) yys = yyname[yychar];",
 300     "            if (!yys) yys = \"illegal-symbol\";",
 301     "            printf(\"%sdebug: state %d, error recovery discards token %d\
 302  (%s)\\n\",",
 303     "                    YYPREFIX, yystate, yychar, yys);",
 304     "        }",
 305     "#endif",
 306     "        yychar = (-1);",
 307     "        goto yyloop;",
 308     "    }",
 309     "yyreduce:",
 310     "#if YYDEBUG",
 311     "    if (yydebug)",
 312     "        printf(\"%sdebug: state %d, reducing by rule %d (%s)\\n\",",
 313     "                YYPREFIX, yystate, yyn, yyrule[yyn]);",
 314     "#endif",
 315     "    yym = yylen[yyn];",
 316     "    yyval = yyvsp[1-yym];",
 317     "    switch (yyn)",
 318     "    {",
 319     NULL
 320 };
 321
 322 const char *trailer[] = {
 323     "    }",
 324     "    yyssp -= yym;",
 325     "    yystate = *yyssp;",
 326     "    yyvsp -= yym;",
 327     "    yym = yylhs[yyn];",
 328     "    if (yystate == 0 && yym == 0)",
 329     "    {",
 330     "#if YYDEBUG",
 331     "        if (yydebug)",
 332     "            printf(\"%sdebug: after reduction, shifting from state 0 to\\",
 333     " state %d\\n\", YYPREFIX, YYFINAL);",
 334     "#endif",
 335     "        yystate = YYFINAL;",
 336     "        *++yyssp = YYFINAL;",
 337     "        *++yyvsp = yyval;",
 338     "        if (yychar < 0)",
 339     "        {",
 340     "            if ((yychar = yylex()) < 0) yychar = 0;",
 341     "#if YYDEBUG",
 342     "            if (yydebug)",
 343     "            {",
 344     "                yys = 0;",
 345     "                if (yychar <= YYMAXTOKEN) yys = yyname[yychar];",
 346     "                if (!yys) yys = \"illegal-symbol\";",
 347     "                printf(\"%sdebug: state %d, reading %d (%s)\\n\",",
 348     "                        YYPREFIX, YYFINAL, yychar, yys);",
 349     "            }",
 350     "#endif",
 351     "        }",
 352     "        if (yychar == 0) goto yyaccept;",
 353     "        goto yyloop;",
 354     "    }",
 355     "    if ((yyn = yygindex[yym]) && (yyn += yystate) >= 0 &&",
 356     "            yyn <= YYTABLESIZE && yycheck[yyn] == yystate)",
 357     "        yystate = yytable[yyn];",
 358     "    else",
 359     "        yystate = yydgoto[yym];",
 360     "#if YYDEBUG",
 361     "    if (yydebug)",
 362     "        printf(\"%sdebug: after reduction, shifting from state %d \\",
 363     "to state %d\\n\", YYPREFIX, *yyssp, yystate);",
 364     "#endif",
 365     "    if (yyssp >= yysslim && yygrowstack())",
 366     "    {",
 367     "        goto yyoverflow;",
 368     "    }",
 369     "    *++yyssp = yystate;",
 370     "    *++yyvsp = yyval;",
 371     "    goto yyloop;",
 372     "yyoverflow:",
 373     "    yyerror(\"yacc stack overflow\");",
 374     "yyabort:",
 375     "    return (1);",
 376     "yyaccept:",
 377     "    return (0);",
 378     "}",
 379     NULL
 380 };
 381
 382
 383 void
 384 write_section(const char **section)
 385 {
 386     int c;
 387     int i;
 388     const char *s;
 389     FILE *f;
 390
 391     f = code_file;
 392     for (i = 0; (s = section[i]); ++i)
 393     {
 394         ++outline;
 395         while ((c = *s))
 396         {
 397             putc(c, f);
 398             ++s;
 399         }
 400         putc('\n', f);
 401     }
 402 }