broken-neees/cpu/FlagsRegister.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 }; }
class FlagsRegister {
  constructor() {
    this.c = false;
    this.z = false;
    this.i = false;
    this.d = false;
    this.v = false;
    this.n = false;
  }
  getValue() {
    return _byte.default.bitfield(this.c, this.z, this.i, this.d, 0, 1, this.v, this.n);
  }
  setValue(value) {
    this.c = _byte.default.getFlag(value, 0);
    this.z = _byte.default.getFlag(value, 1);
    this.i = _byte.default.getFlag(value, 2);
    this.d = _byte.default.getFlag(value, 3);
    this.v = _byte.default.getFlag(value, 6);
    this.n = _byte.default.getFlag(value, 7);
  }
  updateZero(value) {
    this.z = value === 0;
  }
  updateNegative(value) {
    this.n = _byte.default.isNegative(value);
  }
  updateZeroAndNegative(value) {
    this.updateZero(value);
    this.updateNegative(value);
  }
}
exports.default = FlagsRegister;