SemVal *p_execute(SemVal *arr)
{
register size_t count;
SemVal
tmp,
*argp, /* pointer to args */
e;
count = arr->type; /* get argument count */
if (count < 6) /* to few arguments */
{
util_semantic(gp_illegalArgCount, "execute");
return (arr); /* dummy args return */
}
argp = codestruc(arr, 0); /* point to first arg */
e = *(argp + 2); /* cmd head info at e */
p_callRss(&e, f_cmd_head); /* code for cmd_head at e */
p_callRss(argp + 3, f_arg_head); /* code for arg_head */
p_catCode(&e, argp + 3); /* code appended to e*/
p_callRss(&argp[count - 2], f_arg_tail); /* code for arg_tail */
p_catCode(&e, &argp[count - 2]); /* code appended to e*/
p_callRss(&argp[count - 1], f_cmd_tail); /* code for cmd_tail */
p_catCode(&e, &argp[count - 1]); /* code appended to e*/
/* keep variable # of args */
memmove(argp + 2, argp + 4, (count - 2) * sizeof(SemVal));
arr->type -= 4; /* remove 4 arguments */
p_catCode(&e, p_specials(f_exec, arr)); /* catenate call-code */
free(gp_stringbuf); /* make sure empty string */
gp_stringbuf = rss_strdup(""); /* is pushed */
tmp = *p_stackFrame(e_str | e_const); /* empty string argument */
p_expr2stack(&tmp);
p_catCode(&e, &tmp); /* empty string on the stack */
p_generateCode(&e, op_call_rss, f_cmd_tail); /* used with cmd_tail..cmd_head */
p_generateCode(&e, op_call_rss, f_arg_tail);
p_generateCode(&e, op_call_rss, f_arg_head);
p_callRss(&e, f_cmd_head);
*arr = e;
return arr;
}
SemVal *p_ternary(SemVal *cond, SemVal *ifTrue, SemVal *ifFalse)
{
if ((ifTrue->type & ifFalse->type & e_typeMask) == 0)
{
util_semantic(gp_typeConflict, "?:");
p_clearOperands(ifTrue, ifFalse);
return cond;
}
if (test_type(cond, e_const)) /* constant: true or false */
{
p_discard(cond);
if (cond->evalue)
{
p_discard(ifFalse);
p_expr2stack(ifTrue);
return ifTrue;
}
p_discard(ifTrue);
p_expr2stack(ifFalse);
return ifFalse;
}
p_expr2stack(ifTrue); /* convert the expressions to code */
p_expr2stack(ifFalse);
p_generateCode(cond, op_jmp_false, j_falselist); /* jmp around the ifTrue code */
p_patchupTrue(cond, 1); /* destination for the ifTrue code */
p_catCode(cond, ifTrue); /* cond = cond + ifTrue */
p_generateCode(cond, op_jmp, j_truelist); /* jmp around the ifFalse code */
p_patchupFalse(cond, 1); /* destination of the false alternative */
p_catCode(cond, ifFalse); /* cond = cond + ifTrue + jmp + ifFalse */
p_patchupTrue(cond, 1); /* jump from ifTrue to the end of expr. */
return cond; /* ?: return */
}
SemVal *p_catStmnts(SemVal *lval, SemVal *rval)
{
p_patchupFalse(lval, 1);
msg("lval length: %u, rval length: %u", lval->codelen, rval->codelen);
if (gp_nestLevel == 0)
{
util_out(gp_bin, lval->code, lval->codelen);
p_discard(lval);
return rval;
}
return p_catCode(lval, rval);
}
void p_catArgs(SemVal *arr)
{
register unsigned count;
SemVal *ep;
SemVal e;
if (!(count = arr->type))
return; /* no arguments */
ep = (SemVal *)arr->code; /* local pointer to SemVals */
e = ep[--count]; /* e: code of last argument */
while (count--)
p_catCode(&e, &ep[count]); /* catenate next argument(s) */
free(arr->code); /* memory of array is free again */
*arr = e; /* arguments changed to code */
}
SemVal *p_indexOp(SemVal *larg, SemVal *rarg)
{
register int ok;
ExprType type = f_element;
SemVal *tmp;
p_expr2stack(larg); /* arg to stack */
p_expr2stack(rarg); /* arg to stack */
/* This follows the code of `p_twoArgs.c' to compute a list/string */
/* element */
/* first arg must be int */
if (!test_type(larg, e_int)) /* first expression is no int */
{
tmp = larg; /* then swap */
larg = rarg;
rarg = tmp;
}
if ( (ok = test_type(larg, e_int)) ) /* right arg must be int */
{ /* second arg == list: ok */
if (!(ok = test_type(rarg, e_list)))
{ /* second arg == string: ok */
ok = test_type(rarg, e_str);
type = f_str_el; /* string element requested */
}
}
if (ok)
{
p_catCode(rarg, larg); /* make one code vector */
p_callRss(rarg, type);
}
else
{
util_semantic(gp_typeConflict, gp_funstring[type]);
p_discard(larg);
}
return (rarg);
}
/* opstr is '=', or "/=", etc. */
SemVal *p_assignment(SemVal *lval, SemVal *rval, char *opstr)
{
SemVal *tmp;
unsigned type;
unsigned value;
if (!test_type(lval, e_var))
{
util_semantic(gp_lvalueNeeded, opstr);
p_discard(rval);
return lval;
}
p_trySIconvert(lval, rval);
p_expr2stack(rval); /* convert rval to code */
/* same types */
if (lval->type & rval->type & (e_int | e_str | e_list))
{
type = lval->type; /* save type/idx for return */
value = lval->evalue;
p_generateCode(lval, op_copy_var, lval->evalue);
tmp = p_catCode(rval, lval); /* catenate p_assignment code */
tmp->evalue = value; /* set lvalue type and idx */
tmp->type = type;
return tmp;
}
util_semantic(gp_typeConflict, opstr);
p_discard(rval);
return lval;
}
SemVal *p_orBool(SemVal *lexp, SemVal *rexp)
{
if (lexp->type & rexp->type & e_const) /* two constants: compute result */
{
lexp->evalue =
(test_type(lexp, e_str) || lexp->evalue)
||
(test_type(rexp, e_str) || rexp->evalue);
set_type(lexp, e_const | e_int);
}
else /* at least one code-part */
{
p_forceExpr2Bool(lexp); /* boolean code */
p_forceExpr2Bool(rexp);
lexp->codelen -= p_rmJmpZero(lexp->codelen, lexp->falselist,
lexp->falselen);
p_patchupFalse(lexp, 1);
lexp = p_catCode(lexp, rexp);
set_type(lexp, e_bool | e_stack);
}
return (lexp);
}
SemVal *p_twoArgs(ExprType type, SemVal *larg, SemVal *rarg)
{
register int ok;
msg("start");
p_expr2stack(larg); /* arg to stack */
p_expr2stack(rarg); /* arg to stack */
switch ((FunNr)type)
{
case f_fgets:
ok = test_type(larg, e_str) && test_type(rarg, e_list);
break;
case f_element: /* f_element */
/* first arg must be int */
if ( (ok = test_type(larg, e_int)) )
{ /* second arg == list: ok */
if (!(ok = test_type(rarg, e_list)))
{ /* second arg == string: ok */
ok = test_type(rarg, e_str);
type = f_str_el; /* string element requested */
}
}
break;
case f_resize:
ok = test_type(larg, e_str) && test_type(rarg, e_int);
break;
case f_listfind:
ok = test_type(larg, e_list) && test_type(rarg, e_str);
break;
case f_listunion:
ok = test_type(larg, e_list) && test_type(rarg, e_str | e_list);
break;
default:
/*
case f_strchr:
case f_strtok:
case f_c_ext:
case f_c_base:
case f_c_path:
case f_strfind:
*/
ok = larg->type & rarg->type & e_str;
}
msg("types test %d, funstring: %x", ok, type);
if (ok)
{
p_catCode(rarg, larg); /* make one code vector */
p_callRss(rarg, type);
}
else
{
util_semantic(gp_typeConflict, gp_funstring[type]);
p_discard(larg);
rarg = p_stackFrame(e_null);
}
msg("leaving");
return rarg;
}
