swap.c

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/*
 * This file is part of the Fun programming language.
 * https://fun-lang.xyz/
 *
 * Copyright 2025 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the Apache-2.0 license.
 * https://opensource.org/license/apache-2-0
 */


case OP_SWAP: {
 if (vm->sp < 1) {
 fprintf(stderr, "Runtime error: stack underflow for SWAP\n");
 exit(1);
 }
 Value a = vm->stack[vm->sp];
 Value b = vm->stack[vm->sp - 1];
 vm->stack[vm->sp] = b;
 vm->stack[vm->sp - 1] = a;
 break;
}