mirror of
https://github.com/whscullin/apple2js.git
synced 2024-01-12 14:14:38 +00:00
285 lines
8.2 KiB
TypeScript
285 lines
8.2 KiB
TypeScript
import { debug, toHex } from './util';
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import { byte, word } from './types';
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import CPU6502, { DebugInfo, flags, sizes } from './cpu6502';
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export interface DebuggerContainer {
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run: () => void;
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stop: () => void;
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getCPU: () => CPU6502;
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}
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type symbols = { [key: number]: string };
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type breakpointFn = (info: DebugInfo) => boolean
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const alwaysBreak = (_info: DebugInfo) => { return true; };
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export default class Debugger {
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private cpu: CPU6502;
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private verbose = false;
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private maxTrace = 256;
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private trace: DebugInfo[] = [];
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private breakpoints: Map<word, breakpointFn> = new Map();
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private symbols: symbols = {};
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constructor(private container: DebuggerContainer) {
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this.cpu = container.getCPU();
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}
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stepCycles(cycles: number) {
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this.cpu.stepCyclesDebug(this.verbose ? 1 : cycles, () => {
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const info = this.cpu.getDebugInfo();
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if (this.breakpoints.get(info.pc)?.(info)) {
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debug('breakpoint', this.printDebugInfo(info));
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this.container.stop();
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return;
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}
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if (this.verbose) {
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debug(this.printDebugInfo(info));
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} else {
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this.trace.push(info);
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if (this.trace.length > this.maxTrace) {
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this.trace.shift();
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}
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}
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});
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}
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continue = () => {
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this.container.run();
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}
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setVerbose = (verbose: boolean) => {
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this.verbose = verbose;
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}
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setMaxTrace = (maxTrace: number) => {
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this.maxTrace = maxTrace;
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}
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getTrace = () => {
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return this.trace.map(this.printDebugInfo).join('\n');
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}
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printTrace = () => {
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debug(this.getTrace());
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}
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setBreakpoint = (addr: word, exp?: breakpointFn) => {
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this.breakpoints.set(addr, exp || alwaysBreak);
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}
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clearBreakpoint = (addr: word) => {
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this.breakpoints.delete(addr);
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}
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listBreakpoints = () => {
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for(const [addr, fn] of this.breakpoints.entries()) {
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debug(toHex(addr, 4), fn);
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}
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}
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addSymbols = (symbols: symbols) => {
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this.symbols = { ...this.symbols, ...symbols };
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}
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printDebugInfo = (info: DebugInfo) => {
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const { pc, cmd } = info;
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const symbol = this.padWithSymbol(pc);
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return [
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toHex(pc, 4),
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'- ', symbol,
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this.dumpRegisters(info),
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' ',
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this.dumpRawOp(cmd),
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' ',
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this.dumpOp(pc, cmd)
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].join('');
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}
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dumpPC = (pc: word) => {
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const b = this.cpu.read(pc);
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const op = this.cpu.getOpInfo(b);
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const size = sizes[op.mode];
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let result = toHex(pc, 4) + '- ';
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result += this.padWithSymbol(pc);
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const cmd = new Array(size);
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for (let idx = 0, jdx = pc; idx < size; idx++, jdx++) {
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cmd[idx] = this.cpu.read(jdx);
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}
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result += this.dumpRawOp(cmd) + ' ' + this.dumpOp(pc, cmd);
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return result;
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}
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dumpRegisters = (debugInfo?: DebugInfo) => {
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if (debugInfo === undefined) {
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debugInfo = this.cpu.getDebugInfo();
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}
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const { pc, ar, xr, yr, sr, sp } = debugInfo;
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return [
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toHex(pc, 4),
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'- ',
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' A=' + toHex(ar),
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' X=' + toHex(xr),
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' Y=' + toHex(yr),
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' P=' + toHex(sr),
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' S=' + toHex(sp),
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' ',
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((sr & flags.N) ? 'N' : '-'),
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((sr & flags.V) ? 'V' : '-'),
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'-',
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((sr & flags.B) ? 'B' : '-'),
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((sr & flags.D) ? 'D' : '-'),
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((sr & flags.I) ? 'I' : '-'),
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((sr & flags.Z) ? 'Z' : '-'),
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((sr & flags.C) ? 'C' : '-')
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].join('');
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}
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dumpPage = (start: byte, end?: byte) => {
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let result = '';
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if (end === undefined) {
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end = start;
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}
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for (let page = start; page <= end; page++) {
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for (let idx = 0; idx < 16; idx++) {
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result += toHex(page) + toHex(idx << 4) + ': ';
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for (let jdx = 0; jdx < 16; jdx++) {
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const b = this.cpu.read(page, idx * 16 + jdx);
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result += toHex(b) + ' ';
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}
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result += ' ';
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for (let jdx = 0; jdx < 16; jdx++) {
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const b = this.cpu.read(page, idx * 16 + jdx) & 0x7f;
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if (b >= 0x20 && b < 0x7f) {
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result += String.fromCharCode(b);
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} else {
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result += '.';
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}
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}
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result += '\n';
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}
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}
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return result;
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}
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list = (pc: word) => {
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const results = [];
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for (let idx = 0; idx < 20; idx++) {
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const b = this.cpu.read(pc);
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const op = this.cpu.getOpInfo(b);
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results.push(this.dumpPC(pc));
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pc += sizes[op.mode];
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}
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return results;
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}
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private padWithSymbol(pc: word): string {
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const padding = ' ';
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const symbol = this.symbols[pc];
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let result: string = padding;
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if (symbol) {
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result = `${symbol}${padding.substring(symbol.length)}`;
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}
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return result;
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}
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private dumpRawOp(parts: byte[]) {
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const result = new Array(4);
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for (let idx = 0; idx < 4; idx++) {
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if (idx < parts.length) {
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result[idx] = toHex(parts[idx]);
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} else {
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result[idx] = ' ';
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}
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}
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return result.join(' ');
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}
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private dumpOp(pc: word, parts: byte[]) {
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const op = this.cpu.getOpInfo(parts[0]);
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const lsb = parts[1];
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const msb = parts[2];
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const addr = (msb << 8) | lsb;
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let val;
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let off;
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const toHexOrSymbol = (v: word, n?: number) => (
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this.symbols[v] || ('$' + toHex(v, n))
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);
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let result = op.name + ' ';
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switch (op.mode) {
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case 'implied':
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break;
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case 'immediate':
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result += '#' + toHexOrSymbol(lsb);
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break;
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case 'absolute':
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result += '' + toHexOrSymbol(addr, 4);
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break;
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case 'zeroPage':
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result += '' + toHexOrSymbol(lsb);
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break;
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case 'relative':
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{
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off = lsb;
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if (off > 127) {
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off -= 256;
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}
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pc += off + 1;
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result += '' + toHexOrSymbol(pc, 4) + ' (' + off + ')';
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}
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break;
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case 'absoluteX':
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result += '' + toHexOrSymbol(addr, 4)+ ',X';
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break;
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case 'absoluteY':
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result += '' + toHexOrSymbol(addr, 4) + ',Y';
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break;
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case 'zeroPageX':
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result += '' + toHexOrSymbol(lsb) + ',X';
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break;
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case 'zeroPageY':
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result += '' + toHexOrSymbol(lsb) + ',Y';
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break;
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case 'absoluteIndirect':
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result += '(' + toHexOrSymbol(addr, 4) + ')';
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break;
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case 'zeroPageXIndirect':
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result += '(' + toHexOrSymbol(lsb) + ',X)';
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break;
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case 'zeroPageIndirectY':
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result += '(' + toHexOrSymbol(lsb) + '),Y';
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break;
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case 'accumulator':
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result += 'A';
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break;
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case 'zeroPageIndirect':
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result += '(' + toHexOrSymbol(lsb) + ')';
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break;
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case 'absoluteXIndirect':
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result += '(' + toHexOrSymbol(addr, 4) + ',X)';
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break;
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case 'zeroPage_relative':
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val = lsb;
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off = msb;
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if (off > 127) {
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off -= 256;
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}
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pc += off + 2;
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result += '' + toHexOrSymbol(val) + ',' + toHexOrSymbol(pc, 4) + ' (' + off + ')';
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break;
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default:
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break;
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}
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return result;
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}
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}
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