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/**
* @file builtins.c
* Provides built-in functions for the interpreter
* These must be loaded for an instance to do anything meaningful.
*
* Copyright (C) 2018 Clyne Sullivan
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "builtins.h"
#include <stdlib.h>
#define IF_SIG (uint32_t)-1
#define WHILE_SIG (uint32_t)-2
#define ELSE_SIG (uint32_t)-3
#define FUNC_SIG (uint32_t)-4
int bn_set(instance *it);
int bn_if(instance *it);
int bn_else(instance *it);
int bn_end(instance *it);
int bn_while(instance *it);
int bn_func(instance *it);
int bn_solve(instance *it);
void iload_builtins(instance *it)
{
inew_cfunc(it, "set", bn_set);
inew_cfunc(it, "if", bn_if);
inew_cfunc(it, "else", bn_else);
inew_cfunc(it, "while", bn_while);
inew_cfunc(it, "func", bn_func);
inew_cfunc(it, "solve", bn_solve);
}
int bn_set(instance *it)
{
variable *var = igetarg(it, 0);
variable *value = igetarg(it, 1);
var->type = value->type;
var->value.p = value->value.p;
ipush(it, (uint32_t)var);
return 0;
}
int bn_if(instance *it)
{
variable *cond = (variable *)ipop(it);
uint32_t result = cond->value.p;
ipush(it, result);
ipush(it, IF_SIG);
if (result == 0)
it->sindent = SKIP | it->indent;
ipush(it, 0);
ipush(it, 0); // need to return because stack modify
return 0;
}
static uint32_t if_cond = 0;
int bn_else(instance *it)
{
uint32_t cond = if_cond;
if (cond != 0)
it->sindent = SKIP | it->indent;
ipush(it, ELSE_SIG);
ipush(it, 0); // for ret
return 0;
}
int bn_end(instance *it)
{
uint32_t sig = ipop(it);
if (sig == IF_SIG) {
if_cond = ipop(it);
} else if (sig == WHILE_SIG) {
uint32_t lnidx = ipop(it);
if (lnidx != (uint32_t)-1)
it->lnidx = lnidx - 1;
} else if (sig == CALL_SIG) {
it->lnidx = ipop(it);
it->indent++;
}
return 0;
}
int bn_while(instance *it)
{
variable *cond = (variable *)ipop(it);
uint32_t result = cond->value.p;
if (result == 0) {
it->sindent = SKIP | it->indent;
ipush(it, (uint32_t)-1);
} else {
ipush(it, it->lnidx);
}
ipush(it, WHILE_SIG);
ipush(it, 0);
ipush(it, 0); // need to ret
return 0;
}
int bn_func(instance *it)
{
variable *f = igetarg(it, 0);
if (f == 0)
return -1;
f->type = FUNC;
f->value.p = it->lnidx;
it->sindent = SKIP | it->indent;
ipush(it, FUNC_SIG);
ipush(it, 0); // for ret
return 0;
}
int bn_solve(instance *it)
{
variable *s = igetarg(it, 0);
variable **ops = iparse(it, (const char *)s->value.p);
if (ops == 0)
return -1;
variable *a = isolve(it, ops, 0);
free(ops);
ipush(it, (uint32_t)a);
return 0;
}
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