/**
 * This file is part of the Fun programming language.
 * https://hanez.org/project/fun/
 *
 * Copyright 2025 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the ISC license.
 * https://opensource.org/license/isc-license-txt
 */

/**
* @file div.c
 * @brief Implements the OP_DIV opcode for integer division in the VM.
 *
 * This file handles the OP_DIV instruction, which performs integer division
 * on two integer values popped from the stack and pushes the result back onto the stack.
 *
 * Behavior:
 * - Pops two integer values from the stack.
 * - Performs integer division (`a / b`).
 * - Pushes the result back onto the stack.
 *
 * Error Handling:
 * - Exits with an error if the operands are not integers.
 * - Exits with an error if division by zero is attempted.
 *
 * Example:
 * // Bytecode: OP_DIV
 * // Stack before: [10, 2]
 * // Stack after: [5]
 *
 * @author Johannes Findeisen
 * @date 2025-10-16
 */

case OP_DIV: {
    Value b = pop_value(vm);
    Value a = pop_value(vm);
    if (a.type != VAL_INT || b.type != VAL_INT) {
        fprintf(stderr, "Runtime type error: DIV expects ints, got %s and %s\n",
                value_type_name(a.type), value_type_name(b.type));
        exit(1);
    }
    if (b.i == 0) {
        fprintf(stderr, "Runtime error: division by zero\n");
        exit(1);
    }
    Value res = make_int(a.i / b.i);
    free_value(a);
    free_value(b);
    push_value(vm, res);
    break;
}