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/* Bytecode definition file parser.
Copyright (C) 1993 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC 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.
GNU CC 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 GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
%{
#include <stdio.h>
#include "hconfig.h"
#include "bi-defs.h"
extern char yytext[];
extern int yyleng;
/* Chain of all defs built by the parser. */
struct def *defs;
int ndefs;
static struct node *makenode ();
static struct variation *makevar ();
static struct def *makedef ();
void yyerror ();
%}
%union
{
char *string;
struct def *def;
struct variation *variation;
struct node *node;
}
%token <string> DEFOP STRING
%type <string> opt_string
%type <def> defs def
%type <variation> variations variation
%type <node> list items item
%%
top:
defs
{ defs = $1; }
;
defs:
def
| defs def
{ $2->next = $1; $$ = $2; }
;
def:
DEFOP '(' STRING ',' opt_string ',' '(' variations ')' ')'
{ $$ = makedef ($3, $5, $8); }
;
variations:
variation
| variations ',' variation
{ $3->next = $1; $$ = $3; }
;
variation:
'(' opt_string ')'
{ $$ = makevar ($2, (struct node *) NULL, (struct node *) NULL, (struct node *) NULL); }
| '(' opt_string ',' list ')'
{ $$ = makevar ($2, $4, (struct node *) NULL, (struct node *) NULL); }
| '(' opt_string ',' list ',' list ')'
{ $$ = makevar ($2, $4, $6, (struct node *) NULL); }
| '(' opt_string ',' list ',' list ',' list ')'
{ $$ = makevar ($2, $4, $6, $8); }
;
opt_string:
/* empty */ { $$ = ""; }
| STRING { $$ = $1; }
;
list:
'(' items ')'
{ $$ = $2; }
| /* empty */
{ $$ = NULL; }
;
items:
item
/* Note right recursion. */
| item ',' items
{ $1->next = $3; $$ = $1; }
;
item:
STRING
{ $$ = makenode ($1); }
;
%%
static struct node *
makenode (s)
char *s;
{
struct node *n;
n = (struct node *) malloc (sizeof (struct node));
n->text = s;
n->next = NULL;
return n;
}
static struct variation *
makevar (name, inputs, outputs, literals)
char *name;
struct node *inputs, *outputs, *literals;
{
struct variation *v;
v = (struct variation *) malloc (sizeof (struct variation));
v->name = name;
v->code = ndefs++;
v->inputs = inputs;
v->outputs = outputs;
v->literals = literals;
v->next = NULL;
return v;
}
static struct def *
makedef (name, template, vars)
char *name, *template;
struct variation *vars;
{
struct def *d;
d = (struct def *) malloc (sizeof (struct def));
d->basename = name;
d->template = template;
d->variations = vars;
d->next = NULL;
return d;
}
void
yyerror (s)
char *s;
{
fprintf (stderr, "syntax error in input\n");
exit (FATAL_EXIT_CODE);
}
|
