int eval(int addr){
int res;
if(atomp(addr)){
if(IS_NUMBER(addr))
return(addr);
if(IS_SYMBOL(addr)){
res = findsym(GET_NAME(addr));
switch(GET_TAG(res)){
case NUM: return(makenum(GET_NUMBER(res)));
case SYM: return(GET_BIND(res));
case LIS: return(GET_BIND(res));
}
}
}
else{
if(HAS_NAME(car(addr),"quote"))
return(cadr(addr));
if(subrp(car(addr)))
return(apply(symname(car(addr)),evlis(cdr(addr))));
if(fsubrp(car(addr)))
return(apply(symname(car(addr)),cdr(addr)));
if(lambdap(car(addr)))
return(apply(symname(car(addr)),evlis(cdr(addr))));
}
return(NIL);
}
void mark_expr(node *o, unsigned char persistence) {
if ( nullp(o) ) {
return;
}
if (pairp(o) or consp(o)) {
mark_expr(o->car, persistence);
mark_expr(o->cdr, persistence);
} else if (lambdap(o)) {
mark_expr(o->args, persistence);
mark_expr(o->body, persistence);
}
if (o->marked <= 1) {
o->marked = persistence;
}
return;
}
//--------eval---------------
int eval(int addr){
int res;
//ctrl+cによる割り込みがあった場合
if(exit_flag == 1){
exit_flag = 0;
P = addr; //後で調べられるように退避
printf("exit eval by CTRL_C_EVENT\n"); fflush(stdout);
longjmp(buf,1);
}
if(atomp(addr)){
if(numberp(addr))
return(addr);
if(symbolp(addr)){
res = findsym(addr);
if(res == 0)
error(CANT_FIND_ERR, "eval", addr);
else
switch(GET_TAG(res)){
case NUM: return(res);
case SYM: return(res);
case LIS: return(res);
case SUBR: return(res);
case FSUBR: return(res);
case LAMBDA:return(GET_BIND(res));
}
}
}
else
if(listp(addr)){
if((symbolp(car(addr))) &&(HAS_NAME(car(addr),"quote")))
return(cadr(addr));
if(numberp(car(addr)))
error(ARG_SYM_ERR, "eval", addr);
if(subrp(car(addr)))
return(apply(car(addr),evlis(cdr(addr))));
if(fsubrp(car(addr)))
return(apply(car(addr),cdr(addr)));
if(lambdap(car(addr)))
return(apply(car(addr),evlis(cdr(addr))));
}
error(CANT_FIND_ERR, "eval", addr);
}