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https://github.com/freebsd/freebsd-src
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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
77 lines
1.4 KiB
Plaintext
77 lines
1.4 KiB
Plaintext
%{
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#include <stdlib.h>
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typedef enum {cGLOBAL, cLOCAL} class;
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typedef enum {tREAL, tINTEGER} type;
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typedef char * name;
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struct symbol { class c; type t; name id; };
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typedef struct symbol symbol;
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struct namelist { symbol *s; struct namelist *next; };
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typedef struct namelist namelist;
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extern symbol *mksymbol(type t, class c, name id);
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#ifdef YYBISON
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#define YYLEX_DECL() yylex(void)
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#define YYERROR_DECL() yyerror(const char *s)
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extern int YYLEX_DECL();
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extern void YYERROR_DECL();
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#endif
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%}
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%token <cval> GLOBAL LOCAL
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%token <tval> REAL INTEGER
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%token <id> NAME
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%type <nlist> declaration namelist locnamelist
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%type <cval> class
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%type <tval> type
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%union
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{
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class cval;
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type tval;
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namelist * nlist;
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name id;
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}
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%start declaration
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%%
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declaration: class type namelist
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{ $$ = $3; }
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| type locnamelist
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{ $$ = $2; }
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;
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class : GLOBAL { $$ = cGLOBAL; }
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| LOCAL { $$ = cLOCAL; }
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;
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type : REAL { $$ = tREAL; }
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| INTEGER { $$ = tINTEGER; }
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;
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namelist: namelist NAME
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{ $$->s = mksymbol($<tval>0, $<cval>-1, $2);
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$$->next = $1;
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}
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| NAME
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{ $$->s = mksymbol($<tval>0, $<cval>-1, $1);
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$$->next = NULL;
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}
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;
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locnamelist:
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{ $<cval>$ = cLOCAL; } /* set up semantic stack for <class> = LOCAL */
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{ $<tval>$ = $<tval>-1; } /* copy <type> to where <namelist> expects it */
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namelist
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{ $$ = $3; }
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;
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%%
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extern int YYLEX_DECL();
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extern void YYERROR_DECL();
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