0c8de5b03c
Among all the modifications, this new byacc also solves a 14 year old bug [1] PR: bin/23254 [1] Submitted by: marka@nominum.com [1] MFC after: 3 weeks
81 lines
1.4 KiB
Plaintext
81 lines
1.4 KiB
Plaintext
%{
|
|
#include <stdlib.h>
|
|
|
|
typedef enum {cGLOBAL, cLOCAL} class;
|
|
typedef enum {tREAL, tINTEGER} type;
|
|
typedef char * name;
|
|
|
|
struct symbol { class c; type t; name id; };
|
|
typedef struct symbol symbol;
|
|
|
|
struct namelist { symbol *s; struct namelist *next; };
|
|
typedef struct namelist namelist;
|
|
|
|
extern symbol *mksymbol(type t, class c, name id);
|
|
|
|
#ifdef YYBISON
|
|
#define YYLEX_DECL() yylex(void)
|
|
#define YYERROR_DECL() yyerror(const char *s)
|
|
#endif
|
|
%}
|
|
|
|
%token <cval> GLOBAL LOCAL
|
|
%token <tval> REAL INTEGER
|
|
%token <id> NAME
|
|
|
|
%type <nlist> declaration namelist(<cval>, <tval>) locnamelist(<tval>)
|
|
%type <cval> class
|
|
%type <tval> type
|
|
|
|
%destructor {
|
|
namelist *p = $$;
|
|
while (p != NULL)
|
|
{ namelist *pp = p;
|
|
p = p->next;
|
|
free(pp->s); free(pp);
|
|
}
|
|
} <nlist>
|
|
|
|
%union
|
|
{
|
|
class cval;
|
|
type tval;
|
|
namelist * nlist;
|
|
name id;
|
|
}
|
|
|
|
%start declaration
|
|
|
|
%%
|
|
declaration: class type namelist($1, $2)
|
|
{ $$ = $3; }
|
|
| type locnamelist($1)
|
|
{ $$ = $2; }
|
|
;
|
|
|
|
class : GLOBAL { $$ = cGLOBAL; }
|
|
| LOCAL { $$ = cLOCAL; }
|
|
;
|
|
|
|
type : REAL { $$ = tREAL; }
|
|
| INTEGER { $$ = tINTEGER; }
|
|
;
|
|
|
|
namelist($<tval>c, $t, extra): namelist NAME
|
|
{ $$->s = mksymbol($<tval>t, $<cval>c, $2);
|
|
$$->next = $1;
|
|
}
|
|
| NAME
|
|
{ $$->s = mksymbol($t, $c, $1);
|
|
$$->next = NULL;
|
|
}
|
|
;
|
|
|
|
locnamelist($t): namelist(cLOCAL, $t)
|
|
{ $$ = $1; }
|
|
;
|
|
%%
|
|
|
|
extern int YYLEX_DECL();
|
|
extern void YYERROR_DECL();
|