gcc/bi-parser.y

   1 /* Bytecode definition file parser.
   2    Copyright (C) 1993 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 %{
  23
  24 #include <stdio.h>
  25 #include "hconfig.h"
  26 #include "bi-defs.h"
  27
  28 extern char yytext[];
  29 extern int yyleng;
  30
  31
  32 /* Chain of all defs built by the parser. */
  33 struct def *defs;
  34 int ndefs;
  35
  36 static struct node *makenode ();
  37 static struct variation *makevar ();
  38 static struct def *makedef ();
  39
  40 void yyerror ();
  41
  42 %}
  43
  44 %union
  45 {
  46   char *string;
  47   struct def *def;
  48   struct variation *variation;
  49   struct node *node;
  50 }
  51
  52 %token <string> DEFOP STRING
  53 %type <string> opt_string
  54 %type <def> defs def
  55 %type <variation> variations variation
  56 %type <node> list items item
  57
  58 %%
  59
  60 top:
  61   defs
  62     { defs = $1; }
  63   ;
  64
  65 defs:
  66   def
  67   | defs def
  68     { $2->next = $1; $$ = $2; }
  69   ;
  70
  71 def:
  72   DEFOP '(' STRING ',' opt_string ',' '(' variations ')' ')'
  73     { $$ = makedef ($3, $5, $8); }
  74   ;
  75
  76 variations:
  77   variation
  78   | variations ',' variation
  79     { $3->next = $1; $$ = $3; }
  80   ;
  81
  82 variation:
  83   '(' opt_string ')'
  84     { $$ = makevar ($2, (struct node *) NULL, (struct node *) NULL, (struct node *) NULL); }
  85   | '(' opt_string ',' list ')'
  86     { $$ = makevar ($2, $4, (struct node *) NULL, (struct node *) NULL); }
  87   | '(' opt_string ',' list ',' list ')'
  88     { $$ = makevar ($2, $4, $6, (struct node *) NULL); }
  89   | '(' opt_string ',' list ',' list ',' list ')'
  90     { $$ = makevar ($2, $4, $6, $8); }
  91   ;
  92
  93 opt_string:
  94   /* empty */ { $$ = ""; }
  95   | STRING { $$ = $1; }
  96   ;
  97
  98 list:
  99   '(' items ')'
 100     { $$ = $2; }
 101   | /* empty */
 102     { $$ = NULL; }
 103   ;
 104
 105 items:
 106   item
 107   /* Note right recursion. */
 108   | item ',' items
 109     { $1->next = $3; $$ = $1; }
 110   ;
 111
 112 item:
 113   STRING
 114     { $$ = makenode ($1); }
 115   ;
 116
 117 %%
 118
 119 static struct node *
 120 makenode (s)
 121      char *s;
 122 {
 123   struct node *n;
 124
 125   n = (struct node *) malloc (sizeof (struct node));
 126   n->text = s;
 127   n->next = NULL;
 128   return n;
 129 }
 130
 131 static struct variation *
 132 makevar (name, inputs, outputs, literals)
 133      char *name;
 134      struct node *inputs, *outputs, *literals;
 135 {
 136   struct variation *v;
 137
 138   v = (struct variation *) malloc (sizeof (struct variation));
 139   v->name = name;
 140   v->code = ndefs++;
 141   v->inputs = inputs;
 142   v->outputs = outputs;
 143   v->literals = literals;
 144   v->next = NULL;
 145   return v;
 146 }
 147
 148 static struct def *
 149 makedef (name, template, vars)
 150      char *name, *template;
 151      struct variation *vars;
 152 {
 153   struct def *d;
 154
 155   d = (struct def *) malloc (sizeof (struct def));
 156   d->basename = name;
 157   d->template = template;
 158   d->variations = vars;
 159   d->next = NULL;
 160   return d;
 161 }
 162
 163 void
 164 yyerror (s)
 165      char *s;
 166 {
 167   fprintf (stderr, "syntax error in input\n");
 168   exit (FATAL_EXIT_CODE);
 169 }