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(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function _typeof(obj) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) { return typeof obj; } : function (obj) { return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }, _typeof(obj); }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return _typeof(key) === "symbol" ? key : String(key); }
function _toPrimitive(input, hint) { if (_typeof(input) !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (_typeof(res) !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
var STACK_ADDRESS = 0x0100;
var Stack = /*#__PURE__*/function () {
  function Stack(memory, sp) {
    _classCallCheck(this, Stack);
    this._memory = memory;
    this._sp = sp;
  }
  _createClass(Stack, [{
    key: "push",
    value: function push(value) {
      this._memory.write(this._currentAddress(), value);
      this._sp.decrement();
    }
  }, {
    key: "pop",
    value: function pop() {
      this._sp.increment();
      return this._memory.read(this._currentAddress());
    }
  }, {
    key: "push16",
    value: function push16(value) {
      this.push(_byte.default.highByteOf(value));
      this.push(_byte.default.lowByteOf(value));
    }
  }, {
    key: "pop16",
    value: function pop16() {
      var low = this.pop();
      var high = this.pop();
      return _byte.default.buildU16(high, low);
    }
  }, {
    key: "_currentAddress",
    value: function _currentAddress() {
      return STACK_ADDRESS + this._sp.getValue();
    }
  }]);
  return Stack;
}();
exports.default = Stack;