cpu - WIP - Finish refactoring into a library
This commit is contained in:
n loewen
parent
81617dfe42
commit
18d77086df
646
src/cpu.lib.js
646
src/cpu.lib.js
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@ -1,352 +1,352 @@
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const readline = require('readline');
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const readlineSync = require('readline-sync');
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const { num2hex } = require('./logging.js');
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const {
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INITIAL_IP_ADDRESS,
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DEFAULT_CYCLE_LIMIT: CYCLE_LIMIT,
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KEYPAD_ADDR,
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KEY_MAP,
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} = require('./machine.config');
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module.exports = class CPU {
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const {
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num2hex,
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bool2bit,
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} = require('./logging.js');
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const display = require('./display.js');
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/**
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* @arg {number} initialIP
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**/
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constructor(initialIP, cycleLimit) {
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this.running = false;
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this.IP = initialIP;
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this.acc = 0;
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this.flags = {'C': false, 'Z': false, 'N': false, 'O': false};
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this.flagNums = {0: 'C', 1: 'Z', 2: 'N', 3: 'O'};
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this.instruction = { opcode: null, operand: null };
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this.memory = null;
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// STATE
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const CPU = {
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this._cycleLimit = cycleLimit;
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/** Core state **/
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state: {
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running: false,
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IP: INITIAL_IP_ADDRESS,
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flags: {'C': false, 'Z': false, 'N': false, 'O': false},
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FLAGNUMS2NAMES: {0: 'C', 1: 'Z', 2: 'N', 3: 'O'},
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acc: 0,
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memory: null,
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},
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this.dbg = {
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sourceInfo: null,
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currentMnemonic: null,
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previousIP: initialIP,
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cycleCounter: 0,
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}
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}
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/** Debug info **/
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debug: {
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sourceInfo: null,
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previousIP: 0,
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currentInstruction: {
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opcode: null,
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operand: null,
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mnemonic: null,
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},
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cycleCounter: 0,
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},
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/** Functions that update state **/
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/** Public interface **/
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/** @param {Uint8Array} data **/
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loadMemory(data) {
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this.state.memory = new Uint8Array(256);
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this.state.memory.set(data, 0);
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},
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/**
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* @param {Uint8Array} machineCode
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**/
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loadMemory(machineCode) {
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this.memory = new Uint8Array(256);
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this.memory.set(machineCode, 0);
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}
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peek() { return; } // TODO
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poke() { return; } // TODO
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/** @param {Array} info **/ // TODO type info
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loadSourceInfo(info) {
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this.debug.sourceInfo = info;
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},
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this.dbg.sourceInfo = info;
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}
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incrementIP(offset) {
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this.state.previousIP = this.state.IP;
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this.state.IP = this.state.IP + offset;
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},
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setIP(address) {
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this.state.previousIP = this.state.IP;
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this.state.IP = address;
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},
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updateFlagZero() { this.state.flags.Z = this.state.acc === 0; },
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updateFlagNegative() { this.state.acc & 128 ? this.state.flags.N = true : this.state.flags.N = false },
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/**
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* Load code into memory and set CPU state to "state.running"
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* @param {Uint8Array} code - Machine code to load
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**/
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startCPU(code) {
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CPU.loadMemory(code);
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CPU.state.running = true;
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},
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/** Set CPU state to "state.running" **/
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start() {
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this.running = true;
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}
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/** Execute the next instruction in memory **/
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stepCPU() {
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CPU.cycleStartCallbacks.forEach((fn) => fn());
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step() {
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this._cycleStartCallbacks.forEach((fn) => fn());
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if (CPU.state.IP >= CPU.state.memory.length) {
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if (this.IP >= this.memory.length) {
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console.error('HALTING - IP greater than memory size'); // TODO -- should this throw an error instead?
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CPU.state.running = false;
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this.running = false;
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} else {
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CPU.debug.currentInstruction.opcode = CPU.state.memory[CPU.state.IP];
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CPU.debug.currentInstruction.operand = CPU.state.memory[CPU.state.IP+1];
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let executeInstruction = opcodes2mnemonics[CPU.debug.currentInstruction.opcode];
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if (typeof executeInstruction === 'undefined') { failInvalidOpcode(); }
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executeInstruction(CPU.debug.currentInstruction.operand);
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CPU.debug.cycleCounter += 1;
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this.instruction.opcode = this.memory[this.IP];
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this.instruction.operand = this.memory[this.IP+1];
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let mnem = this._nums2mnems[this.instruction.opcode];
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let op = this._ops[mnem];
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if (typeof op === 'undefined') { this._failInvalidOpcode(); }
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op(this.instruction.operand);
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this.dbg.cycleCounter += 1;
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}
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// Temporary limit as a lazy way to halt infinite loops
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if ((CYCLE_LIMIT > 0) && CPU.debug.cycleCounter >= CYCLE_LIMIT) {
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if ((this._cycleLimit > 0) && this.dbg.cycleCounter >= this._cycleLimit) {
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console.warn(' HALTING - reached cycle limit'); // TODO -- throw error?
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CPU.state.running = false;
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this.running = false;
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}
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if (!CPU.state.running) process.exit();
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CPU.cycleEndCallbacks.forEach((fn) => fn());
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},
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this._cycleEndCallbacks.forEach((fn) => fn());
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if (!this.running) process.exit();
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}
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/** Private methods **/
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_incrementIP(offset) {
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this.dbg.previousIP = this.IP;
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this.IP = this.IP + offset;
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}
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_setIP(address) {
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this.dbg.previousIP = this.IP;
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this.IP = address;
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}
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_updateFlagZero() {
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this.flags.Z = this.acc === 0;
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}
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_updateFlagNegative() {
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if (this.acc & 128)
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{ this.flags.N = true; }
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else
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{ this.flags.N = false; }
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}
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/** Hooks **/
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cycleStartCallbacks: [],
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cycleEndCallbacks: [],
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/** @type Array<Function> **/
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_cycleStartCallbacks = [];
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/** @type Array<Function> **/
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_cycleEndCallbacks = [];
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/** @param {function} fn **/
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onCycleStart(fn) { this.cycleStartCallbacks.push(fn) },
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onCycleEnd(fn) { this.cycleEndCallbacks.push(fn) },
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onCycleStart(fn) { this._cycleStartCallbacks.push(fn) };
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/** @param {function} fn **/
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onCycleEnd(fn) { this._cycleEndCallbacks.push(fn) };
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_ops = {
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end: () => {
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this.dbg.currentMnemonic = 'END';
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this.running = false;
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this._incrementIP(2);
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},
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store_lit: (lit) => {
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this.dbg.currentMnemonic = 'STO lit';
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this.memory[lit] = this.acc;
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this._incrementIP(2);
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},
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store_addr: (addr) => {
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this.dbg.currentMnemonic = `STO addr; @addr: ${num2hex(this.memory[addr])}`;
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this.memory[this.memory[addr]] = this.acc;
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this._incrementIP(2);
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},
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load_lit: (lit) => {
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this.dbg.currentMnemonic = 'LDA lit';
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this.acc = lit;
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this._updateFlagNegative();
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this._updateFlagZero();
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this._incrementIP(2);
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},
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load_addr: (addr) => {
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this.dbg.currentMnemonic = `LDA addr; @ addr: ${num2hex(this.memory[addr])}`;
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this.acc = this.memory[addr];
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this._updateFlagNegative();
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this._updateFlagZero();
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this._incrementIP(2);
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},
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add_lit: (lit) => {
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this.dbg.currentMnemonic = 'ADD lit';
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// Calculate sum
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let sum = this.acc + lit;
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if (sum > 255) {
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this.flags.C = true;
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sum = (sum % 255) - 1;
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} else {
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this.flags.C = false;
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}
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// Calculate overflow flag status
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let bitSixCarry = 0;
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if ((this.acc & 64) && (lit & 64)) { bitSixCarry = 1; }
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// let overflow = bitSixCarry ^ (this.flags & 8);
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// FIXME FIXME FIXME
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// I'm on a plane and can't remember how this works
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let overflow = 0;
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if (overflow) {
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this.flags.O = true;
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} else {
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this.flags.O = false;
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}
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this.acc = sum;
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this._updateFlagNegative();
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this._updateFlagZero();
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this._incrementIP(2);
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},
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add_addr: (addr) => {
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this.dbg.currentMnemonic = 'ADD addr';
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// Calculate sum
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let sum = this.acc + this.memory[addr];
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if (sum > 255) {
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this.flags.C = true;
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sum = (sum % 255) - 1;
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} else {
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this.flags.C = false;
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}
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// Calculate overflow flag status
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let bitSixCarry = 0;
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if ((this.acc & 64) && (addr & 64)) { bitSixCarry = 1; }
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// let overflow = bitSixCarry ^ (this.flags & 8);
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// FIXME FIXME FIXME
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// I'm on a plane and can't remember how this works
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let overflow = 0;
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if (overflow) {
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this.flags.O = true;
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} else {
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this.flags.O = false;
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}
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this.acc = sum;
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this._updateFlagNegative();
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this._updateFlagZero();
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this._incrementIP(2);
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},
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sub_lit: (lit) => {
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this.dbg.currentMnemonic = 'SUB lit';
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// Calculate sum
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let sum = this.acc - lit;
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if (sum < 0) {
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this.flags.C = true;
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sum = sum + 256;
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} else {
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this.flags.C = false;
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}
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// Calculate overflow flag status
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let bitSixCarry = 0;
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if ((this.acc & 64) && (lit & 64)) { bitSixCarry = 1; }
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// let overflow = bitSixCarry ^ (this.flags & 8);
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// FIXME FIXME FIXME
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// I'm on a plane and can't remember how this works
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let overflow = 0;
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if (overflow) {
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this.flags.O = true;
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} else {
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this.flags.O = false;
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}
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this.acc = sum;
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this._updateFlagNegative();
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this._updateFlagZero();
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this._incrementIP(2);
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},
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sub_addr: (addr) => {
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this.dbg.currentMnemonic = 'SUB addr';
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// Calculate sum
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let sum = this.acc - this.memory[addr];
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if (sum < 0) {
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this.flags.C = true;
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sum = sum + 256;
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} else {
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this.flags.C = false;
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}
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// Calculate overflow flag status
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let bitSixCarry = 0;
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if ((this.acc & 64) && (addr & 64)) { bitSixCarry = 1; }
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// let overflow = bitSixCarry ^ (this.flags & 8);
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// FIXME FIXME FIXME
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// I'm on a plane and can't remember how this works
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let overflow = 0;
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if (overflow) {
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this.flags.O = true;
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} else {
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this.flags.O = false;
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}
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this.acc = sum;
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this._updateFlagNegative();
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this._updateFlagZero();
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this._incrementIP(2);
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},
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hop_lit: (lit) => {
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this.dbg.currentMnemonic = `HOP lit; IP+2: ${this.memory[this.IP+2]}, IP+3: ${this.memory[this.IP+3]}`;
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if (this.acc === lit) {
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this._incrementIP(4);
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} else {
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this._incrementIP(2);
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}
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},
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hop_addr: (addr) => {
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this.dbg.currentMnemonic = 'HOP addr';
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if (this.acc === this.memory[addr]) {
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this._incrementIP(4);
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} else {
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this._incrementIP(2);
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}
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},
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jump_lit: (lit) => {
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this.dbg.currentMnemonic = 'JMP lit';
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this._setIP(lit);
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},
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jump_addr: (addr) => {
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this.dbg.currentMnemonic = 'JMP addr';
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this._setIP(this.memory[addr]);
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},
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flag_toggle: (flagNum) => {
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if (flagNum === null) {
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console.error('Invalid flag number');
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process.exit(); // TODO review
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}
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const flagName = this.flagNums[flagNum];
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this.dbg.currentMnemonic = `FTG ${flagName}`;
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this.flags[flagName] = !this.flags[flagName];
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this._incrementIP(2);
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},
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flag_hop: (flagNum) => {
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if (flagNum === null) {
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console.error('Invalid flag number');
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process.exit();
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}
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const flagName = this.flagNums[flagNum];
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this.dbg.currentMnemonic =
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`FHP ${flagName}; IP+2: ${this.memory[this.IP+2]}, IP+3: ${this.memory[this.IP+3]}`;
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if (this.flags[this.flagNums[flagNum]]) {
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this._incrementIP(4);
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} else {
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this._incrementIP(2);
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}
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},
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no_op: () => {
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this.dbg.currentMnemonic = `NOP`;
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this._incrementIP(2);
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},
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}
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_nums2mnems = {
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0: "end",
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1: "store_lit",
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2: "store_addr",
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3: "load_lit",
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4: "load_addr",
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5: "add_lit",
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6: "add_addr",
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7: "sub_lit",
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8: "sub_addr",
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9: "hop_lit",
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10: "hop_addr",
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11: "jump_lit",
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12: "jump_addr",
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13: "flag_toggle",
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14: "flag_hop",
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15: "no_op",
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}
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_failInvalidOpcode() {
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let info = this.dbg.sourceInfo[this.dbg.previousIP];
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console.error();
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console.error(`Error: Invalid opcode`);
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console.error(` Executing $${num2hex(info.machine[0])} $${num2hex(info.machine[1])}`);
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console.error(` from line ${info.lineNumber}: ${info.source}`);
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process.exit();
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}
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}
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// FUNCTIONS THAT MODIFY STATE
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const Instructions = {
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end: () => {
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CPU.debug.currentInstruction.mnemonic = 'END';
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CPU.state.running = false;
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CPU.incrementIP(2);
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},
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store_lit: (lit) => {
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CPU.debug.currentInstruction.mnemonic = 'STO lit';
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CPU.state.memory[lit] = CPU.state.acc;
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CPU.incrementIP(2);
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},
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store_addr: (addr) => {
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CPU.debug.currentInstruction.mnemonic = `STO addr; @addr: ${num2hex(CPU.state.memory[addr])}`;
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CPU.state.memory[CPU.state.memory[addr]] = CPU.state.acc;
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CPU.incrementIP(2);
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},
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load_lit: (lit) => {
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CPU.debug.currentInstruction.mnemonic = 'LDA lit';
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CPU.state.acc = lit;
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CPU.updateFlagNegative();
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CPU.updateFlagZero();
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CPU.incrementIP(2);
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},
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load_addr: (addr) => {
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CPU.debug.currentInstruction.mnemonic = `LDA addr; @ addr: ${num2hex(CPU.state.memory[addr])}`;
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CPU.state.acc = CPU.state.memory[addr];
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CPU.updateFlagNegative();
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CPU.updateFlagZero();
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CPU.incrementIP(2);
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},
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add_lit: (lit) => {
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CPU.debug.currentInstruction.mnemonic = 'ADD lit';
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// Calculate sum
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let sum = CPU.state.acc + lit;
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if (sum > 255) {
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CPU.state.flags.C = true;
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sum = (sum % 255) - 1;
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} else {
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CPU.state.flags.C = false;
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}
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// Calculate overflow flag status
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let bitSixCarry = 0;
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if ((CPU.state.acc & 64) && (lit & 64)) { bitSixCarry = 1; }
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// let overflow = bitSixCarry ^ (CPU.state.flags & 8);
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// FIXME FIXME FIXME
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// I'm on a plane and can't remember how this works
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let overflow = 0;
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if (overflow) {
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CPU.state.flags.O = true;
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} else {
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CPU.state.flags.O = false;
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}
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||||
CPU.state.acc = sum;
|
||||
CPU.updateFlagNegative();
|
||||
CPU.updateFlagZero();
|
||||
CPU.incrementIP(2);
|
||||
},
|
||||
|
||||
add_addr: (addr) => {
|
||||
CPU.debug.currentInstruction.mnemonic = 'ADD addr';
|
||||
// Calculate sum
|
||||
let sum = CPU.state.acc + CPU.state.memory[addr];
|
||||
if (sum > 255) {
|
||||
CPU.state.flags.C = true;
|
||||
sum = (sum % 255) - 1;
|
||||
} else {
|
||||
CPU.state.flags.C = false;
|
||||
}
|
||||
// Calculate overflow flag status
|
||||
let bitSixCarry = 0;
|
||||
if ((CPU.state.acc & 64) && (addr & 64)) { bitSixCarry = 1; }
|
||||
// let overflow = bitSixCarry ^ (CPU.state.flags & 8);
|
||||
// FIXME FIXME FIXME
|
||||
// I'm on a plane and can't remember how this works
|
||||
let overflow = 0;
|
||||
if (overflow) {
|
||||
CPU.state.flags.O = true;
|
||||
} else {
|
||||
CPU.state.flags.O = false;
|
||||
}
|
||||
CPU.state.acc = sum;
|
||||
CPU.updateFlagNegative();
|
||||
CPU.updateFlagZero();
|
||||
CPU.incrementIP(2);
|
||||
},
|
||||
|
||||
sub_lit: (lit) => {
|
||||
CPU.debug.currentInstruction.mnemonic = 'SUB lit';
|
||||
// Calculate sum
|
||||
let sum = CPU.state.acc - lit;
|
||||
if (sum < 0) {
|
||||
CPU.state.flags.C = true;
|
||||
sum = sum + 256;
|
||||
} else {
|
||||
CPU.state.flags.C = false;
|
||||
}
|
||||
// Calculate overflow flag status
|
||||
let bitSixCarry = 0;
|
||||
if ((CPU.state.acc & 64) && (lit & 64)) { bitSixCarry = 1; }
|
||||
// let overflow = bitSixCarry ^ (CPU.state.flags & 8);
|
||||
// FIXME FIXME FIXME
|
||||
// I'm on a plane and can't remember how this works
|
||||
let overflow = 0;
|
||||
if (overflow) {
|
||||
CPU.state.flags.O = true;
|
||||
} else {
|
||||
CPU.state.flags.O = false;
|
||||
}
|
||||
CPU.state.acc = sum;
|
||||
CPU.updateFlagNegative();
|
||||
CPU.updateFlagZero();
|
||||
CPU.incrementIP(2);
|
||||
},
|
||||
|
||||
sub_addr: (addr) => {
|
||||
CPU.debug.currentInstruction.mnemonic = 'SUB addr';
|
||||
// Calculate sum
|
||||
let sum = CPU.state.acc - CPU.state.memory[addr];
|
||||
if (sum < 0) {
|
||||
CPU.state.flags.C = true;
|
||||
sum = sum + 256;
|
||||
} else {
|
||||
CPU.state.flags.C = false;
|
||||
}
|
||||
// Calculate overflow flag status
|
||||
let bitSixCarry = 0;
|
||||
if ((CPU.state.acc & 64) && (addr & 64)) { bitSixCarry = 1; }
|
||||
// let overflow = bitSixCarry ^ (CPU.state.flags & 8);
|
||||
// FIXME FIXME FIXME
|
||||
// I'm on a plane and can't remember how this works
|
||||
let overflow = 0;
|
||||
if (overflow) {
|
||||
CPU.state.flags.O = true;
|
||||
} else {
|
||||
CPU.state.flags.O = false;
|
||||
}
|
||||
CPU.state.acc = sum;
|
||||
CPU.updateFlagNegative();
|
||||
CPU.updateFlagZero();
|
||||
CPU.incrementIP(2);
|
||||
},
|
||||
|
||||
hop_lit: (lit) => {
|
||||
CPU.debug.currentInstruction.mnemonic = `HOP lit; IP+2: ${CPU.state.memory[CPU.state.IP+2]}, IP+3: ${CPU.state.memory[CPU.state.IP+3]}`;
|
||||
if (CPU.state.acc === lit) {
|
||||
CPU.incrementIP(4);
|
||||
} else {
|
||||
CPU.incrementIP(2);
|
||||
}
|
||||
},
|
||||
|
||||
hop_addr: (addr) => {
|
||||
CPU.debug.currentInstruction.mnemonic = 'HOP addr';
|
||||
if (CPU.state.acc === CPU.state.memory[addr]) {
|
||||
CPU.incrementIP(4);
|
||||
} else {
|
||||
CPU.incrementIP(2);
|
||||
}
|
||||
},
|
||||
|
||||
jump_lit: (lit) => {
|
||||
CPU.debug.currentInstruction.mnemonic = 'JMP lit';
|
||||
CPU.setIP(lit);
|
||||
},
|
||||
|
||||
jump_addr: (addr) => {
|
||||
CPU.debug.currentInstruction.mnemonic = 'JMP addr';
|
||||
CPU.setIP(CPU.state.memory[addr]);
|
||||
},
|
||||
|
||||
flag_toggle: (flagNum) => {
|
||||
if (flagNum === null) {
|
||||
console.error('Invalid flag number');
|
||||
process.exit();
|
||||
}
|
||||
const flagName = CPU.FLAGNUMS2NAMES[flagNum];
|
||||
CPU.debug.currentInstruction.mnemonic = `FTG ${flagName}`;
|
||||
CPU.state.flags[flagName] = !CPU.state.flags[flagName];
|
||||
CPU.incrementIP(2);
|
||||
},
|
||||
|
||||
flag_hop: (flagNum) => {
|
||||
if (flagNum === null) {
|
||||
console.error('Invalid flag number');
|
||||
process.exit();
|
||||
}
|
||||
const flagName = CPU.FLAGNUMS2NAMES[flagNum];
|
||||
CPU.debug.currentInstruction.mnemonic = `FHP ${flagName}; IP+2: ${CPU.state.memory[CPU.state.IP+2]}, IP+3: ${CPU.state.memory[CPU.state.IP+3]}`;
|
||||
if (CPU.state.flags[CPU.FLAGNUMS2NAMES[flagNum]]) {
|
||||
CPU.incrementIP(4);
|
||||
} else {
|
||||
CPU.incrementIP(2);
|
||||
}
|
||||
},
|
||||
|
||||
no_op: () => {
|
||||
CPU.debug.currentInstruction.mnemonic = `NOP`;
|
||||
CPU.incrementIP(2);
|
||||
},
|
||||
}
|
||||
|
||||
const opcodes2mnemonics = {
|
||||
0: (operand) => Instructions.end(),
|
||||
1: (operand) => Instructions.store_lit(operand),
|
||||
2: (operand) => Instructions.store_addr(operand),
|
||||
3: (operand) => Instructions.load_lit(operand),
|
||||
4: (operand) => Instructions.load_addr(operand),
|
||||
5: (operand) => Instructions.add_lit(operand),
|
||||
6: (operand) => Instructions.add_addr(operand),
|
||||
7: (operand) => Instructions.sub_lit(operand),
|
||||
8: (operand) => Instructions.sub_addr(operand),
|
||||
9: (operand) => Instructions.hop_lit(operand),
|
||||
10: (operand) => Instructions.hop_addr(operand),
|
||||
11: (operand) => Instructions.jump_lit(operand),
|
||||
12: (operand) => Instructions.jump_addr(operand),
|
||||
13: (operand) => Instructions.flag_toggle(operand),
|
||||
14: (operand) => Instructions.flag_hop(operand),
|
||||
15: (operand) => Instructions.no_op(),
|
||||
};
|
||||
|
||||
|
||||
function failInvalidOpcode() {
|
||||
let info = CPU.debug.sourceInfo[CPU.previousIP];
|
||||
console.error();
|
||||
console.error(`Error: Invalid opcode`);
|
||||
console.error(` Executing $${num2hex(info.machine[0])} $${num2hex(info.machine[1])}`);
|
||||
console.error(` from line ${info.lineNumber}: ${info.source}`);
|
||||
process.exit();
|
||||
}
|
||||
Loading…
Reference in New Issue