log.c

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/*
 * This file is part of the Fun programming language.
 * https://fun-lang.xyz/
 *
 * Copyright 2026 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the Apache-2.0 license.
 * https://opensource.org/license/apache-2-0
 */


#include <math.h>

case OP_LOG: {
 Value v = pop_value(vm);
 if (v.type == VAL_INT || v.type == VAL_FLOAT) {
 double x = (v.type == VAL_FLOAT) ? v.d : (double)v.i;
 if (x <= 0.0) {
 /* Domain error: return NaN to signal invalid input */
 push_value(vm, make_float(NAN));
 } else {
 double r = log(x);
 push_value(vm, make_float(r));
 }
 free_value(v);
 } else {
 fprintf(stderr, "Runtime type error: LOG expects number, got %s\n", value_type_name(v.type));
 exit(1);
 }
 break;
}