broken-neees/cpu/Stack.js

A really broken NEEES emulator that introduces glitches and random bugs on purpose!

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var _byte = _interopRequireDefault(require("../lib/byte"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
const STACK_ADDRESS = 0x0100;
class Stack {
  constructor(memory, sp) {
    this._memory = memory;
    this._sp = sp;
  }
  push(value) {
    this._memory.write(this._currentAddress(), value);
    this._sp.decrement();
  }
  pop() {
    this._sp.increment();
    return this._memory.read(this._currentAddress());
  }
  push16(value) {
    this.push(_byte.default.highByteOf(value));
    this.push(_byte.default.lowByteOf(value));
  }
  pop16() {
    const low = this.pop();
    const high = this.pop();
    return _byte.default.buildU16(high, low);
  }
  _currentAddress() {
    return STACK_ADDRESS + this._sp.getValue();
  }
}
exports.default = Stack;