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var net = require('net');
var readline = require('readline');
var inherits = require('util').inherits;
var spawn = require('child_process').spawn;
exports.port = 5858;
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exports.start = function() {
var interface = new Interface();
};
var args = process.argv.slice(2);
args.unshift('--debug-brk');
//
// Parser/Serializer for V8 debugger protocol
// http://code.google.com/p/v8/wiki/DebuggerProtocol
//
// Usage:
// p = new Protocol();
//
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// p.onResponse = function(res) {
// // do stuff with response from V8
// };
//
// socket.setEncoding('utf8');
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// socket.on('data', function(s) {
// // Pass strings into the protocol
// p.execute(s);
// });
//
//
function Protocol() {
this._newRes();
}
exports.Protocol = Protocol;
Protocol.prototype._newRes = function(raw) {
this.res = { raw: raw || '', headers: {} };
this.state = 'headers';
this.reqSeq = 1;
this.execute('');
};
Protocol.prototype.execute = function(d) {
var res = this.res;
res.raw += d;
switch (this.state) {
case 'headers':
var endHeaderIndex = res.raw.indexOf('\r\n\r\n');
if (endHeaderIndex < 0) break;
var lines = res.raw.slice(0, endHeaderIndex).split('\r\n');
for (var i = 0; i < lines.length; i++) {
var kv = lines[i].split(/: +/);
res.headers[kv[0]] = kv[1];
}
this.contentLength = +res.headers['Content-Length'];
this.bodyStartIndex = endHeaderIndex + 4;
this.state = 'body';
if (res.raw.length - this.bodyStartIndex < this.contentLength) break;
// pass thru
case 'body':
if (res.raw.length - this.bodyStartIndex >= this.contentLength) {
res.body =
res.raw.slice(this.bodyStartIndex,
this.bodyStartIndex + this.contentLength);
// JSON parse body?
res.body = res.body.length ? JSON.parse(res.body) : {};
// Done!
this.onResponse(res);
this._newRes(res.raw.slice(this.bodyStartIndex + this.contentLength));
}
break;
default:
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throw new Error('Unknown state');
break;
}
};
Protocol.prototype.serialize = function(req) {
req.type = 'request';
req.seq = this.reqSeq++;
var json = JSON.stringify(req);
return 'Content-Length: ' + json.length + '\r\n\r\n' + json;
};
var NO_FRAME = -1;
function Client() {
net.Stream.call(this);
var protocol = this.protocol = new Protocol(this);
this._reqCallbacks = [];
var socket = this;
this.currentFrame = NO_FRAME;
this.currentSourceLine = -1;
this.currentSource = null;
this.handles = {};
this.scripts = {};
// Note that 'Protocol' requires strings instead of Buffers.
socket.setEncoding('utf8');
socket.on('data', function(d) {
protocol.execute(d);
});
protocol.onResponse = this._onResponse.bind(this);
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}
inherits(Client, net.Stream);
exports.Client = Client;
Client.prototype._addHandle = function(desc) {
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if (typeof desc != 'object' || !desc.handle) throw new Error('bad type');
this.handles[desc.handle] = desc;
if (desc.type == 'script') {
this._addScript(desc);
}
};
var natives = process.binding('natives');
Client.prototype._addScript = function(desc) {
this.scripts[desc.id] = desc;
if (desc.name) {
desc.isNative = (desc.name.replace('.js', '') in natives) ||
desc.name == 'node.js';
}
};
Client.prototype._removeScript = function(desc) {
this.scripts[desc.id] = undefined;
};
Client.prototype._onResponse = function(res) {
for (var i = 0; i < this._reqCallbacks.length; i++) {
var cb = this._reqCallbacks[i];
if (this._reqCallbacks[i].request_seq == res.body.request_seq) break;
}
var self = this;
var handled = false;
if (res.headers.Type == 'connect') {
// Request a list of scripts for our own storage.
self.reqScripts();
self.emit('ready');
handled = true;
} else if (res.body && res.body.event == 'break') {
this.emit('break', res.body);
handled = true;
} else if (res.body && res.body.event == 'afterCompile') {
this._addHandle(res.body.body.script);
handled = true;
} else if (res.body && res.body.event == 'scriptCollected') {
// ???
this._removeScript(res.body.body.script);
handled = true;
}
if (cb) {
this._reqCallbacks.splice(i, 1);
handled = true;
cb(res.body);
}
if (!handled) this.emit('unhandledResponse', res.body);
};
Client.prototype.req = function(req, cb) {
this.write(this.protocol.serialize(req));
cb.request_seq = req.seq;
this._reqCallbacks.push(cb);
};
Client.prototype.reqVersion = function(cb) {
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this.req({ command: 'version' } , function(res) {
if (cb) cb(res.body.V8Version, res.running);
});
};
Client.prototype.reqEval = function(expression, cb) {
var self = this;
var req = {
command: 'evaluate',
arguments: { expression: expression }
};
if (this.currentFrame == NO_FRAME) {
req.arguments.global = true;
} else {
req.arguments.frame = this.currentFrame;
}
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this.req(req, function(res) {
console.error('reqEval res ', res.body);
self._addHandle(res.body);
if (cb) cb(res.body);
});
};
// reqBacktrace(cb)
// TODO: from, to, bottom
Client.prototype.reqBacktrace = function(cb) {
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this.req({ command: 'backtrace' } , function(res) {
if (cb) cb(res.body);
});
};
// Returns an array of objects like this:
//
// { handle: 11,
// type: 'script',
// name: 'node.js',
// id: 14,
// lineOffset: 0,
// columnOffset: 0,
// lineCount: 562,
// sourceStart: '(function(process) {\n\n ',
// sourceLength: 15939,
// scriptType: 2,
// compilationType: 0,
// context: { ref: 10 },
// text: 'node.js (lines: 562)' }
//
Client.prototype.reqScripts = function(cb) {
var self = this;
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this.req({ command: 'scripts' } , function(res) {
for (var i = 0; i < res.body.length; i++) {
self._addHandle(res.body[i]);
}
if (cb) cb();
});
};
Client.prototype.reqContinue = function(cb) {
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this.req({ command: 'continue' }, function(res) {
if (cb) cb(res);
});
};
Client.prototype.listbreakpoints = function(cb) {
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this.req({ command: 'listbreakpoints' }, function(res) {
if (cb) cb(res);
});
};
Client.prototype.reqSource = function(from, to, cb) {
var req = {
command: 'source',
fromLine: from,
toLine: to
};
this.req(req, function(res) {
if (cb) cb(res.body);
});
};
// client.next(1, cb);
Client.prototype.step = function(action, count, cb) {
var req = {
command: 'continue',
arguments: { stepaction: action, stepcount: count }
};
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this.req(req, function(res) {
if (cb) cb(res);
});
};
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var helpMessage = 'Commands: run, kill, print, step, next, ' +
'continue, list, scripts, backtrace, version, quit';
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function SourceUnderline(sourceText, position) {
if (!sourceText) return;
// Create an underline with a caret pointing to the source position. If the
// source contains a tab character the underline will have a tab character in
// the same place otherwise the underline will have a space character.
var underline = '';
for (var i = 0; i < position; i++) {
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if (sourceText[i] == '\t') {
underline += '\t';
} else {
underline += ' ';
}
}
underline += '^';
// Return the source line text with the underline beneath.
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return sourceText + '\n' + underline;
}
function SourceInfo(body) {
var result = '';
if (body.script) {
if (body.script.name) {
result += body.script.name;
} else {
result += '[unnamed]';
}
}
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result += ':';
result += body.sourceLine + 1;
return result;
}
// This class is the readline-enabled debugger interface which is invoked on
// "node debug"
function Interface() {
var self = this;
var term = this.term = readline.createInterface(process.stdout);
var child;
var client;
var term;
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process.on('exit', function() {
self.killChild();
});
this.stdin = process.openStdin();
this.stdin.addListener('data', function(chunk) {
term.write(chunk);
});
term.setPrompt('debug> ');
term.prompt();
this.quitting = false;
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process.on('SIGINT', function() {
self.handleSIGINT();
});
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term.on('SIGINT', function() {
self.handleSIGINT();
});
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term.on('close', function() {
self.tryQuit();
});
term.on('line', function(cmd) {
// trim whitespace
cmd = cmd.replace(/^\s*/, '').replace(/\s*$/, '');
if (cmd.length) {
self._lastCommand = cmd;
self.handleCommand(cmd);
} else {
self.handleCommand(self._lastCommand);
}
});
}
Interface.prototype.handleSIGINT = function() {
if (this.paused) {
this.child.kill('SIGINT');
} else {
this.tryQuit();
}
};
Interface.prototype.quit = function() {
if (this.quitting) return;
this.quitting = true;
this.killChild();
this.term.close();
process.exit(0);
};
Interface.prototype.tryQuit = function() {
var self = this;
if (self.child) {
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self.quitQuestion(function(yes) {
if (yes) {
self.quit();
} else {
self.term.prompt();
}
});
} else {
self.quit();
}
};
Interface.prototype.pause = function() {
this.paused = true;
this.stdin.pause();
this.term.pause();
};
Interface.prototype.resume = function() {
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if (!this.paused) return false;
this.paused = false;
this.stdin.resume();
this.term.resume();
this.term.prompt();
return true;
};
Interface.prototype.handleBreak = function(r) {
var result = '';
if (r.breakpoints) {
result += 'breakpoint';
if (r.breakpoints.length > 1) {
result += 's';
}
result += ' #';
for (var i = 0; i < r.breakpoints.length; i++) {
if (i > 0) {
result += ', #';
}
result += r.breakpoints[i];
}
} else {
result += 'break';
}
result += ' in ';
result += r.invocationText;
result += ', ';
result += SourceInfo(r);
result += '\n';
result += SourceUnderline(r.sourceLineText, r.sourceColumn);
this.client.currentSourceLine = r.sourceLine;
this.client.currentFrame = 0;
this.client.currentScript = r.script.name;
console.log(result);
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if (!this.resume()) this.term.prompt();
};
function intChars(n) {
// TODO dumb:
if (n < 50) {
return 2;
} else if (n < 950) {
return 3;
} else if (n < 9950) {
return 4;
} else {
return 5;
}
}
function leftPad(n) {
var s = n.toString();
var nchars = intChars(n);
var nspaces = nchars - s.length;
for (var i = 0; i < nspaces; i++) {
s = ' ' + s;
}
return s;
}
Interface.prototype.handleCommand = function(cmd) {
var self = this;
var client = this.client;
var term = this.term;
if (cmd == 'quit' || cmd == 'q' || cmd == 'exit') {
self._lastCommand = null;
self.tryQuit();
} else if (/^r(un)?/.test(cmd)) {
self._lastCommand = null;
if (self.child) {
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self.restartQuestion(function(yes) {
if (!yes) {
self._lastCommand = null;
term.prompt();
} else {
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console.log('restarting...');
self.killChild();
// XXX need to wait a little bit for the restart to work?
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setTimeout(function() {
self.trySpawn();
}, 1000);
}
});
} else {
self.trySpawn();
}
} else if (/^help/.test(cmd)) {
console.log(helpMessage);
term.prompt();
} else if ('version' == cmd) {
if (!client) {
self.printNotConnected();
return;
}
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client.reqVersion(function(v) {
console.log(v);
term.prompt();
});
} else if (/info +breakpoints/.test(cmd)) {
if (!client) {
self.printNotConnected();
return;
}
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client.listbreakpoints(function(res) {
console.log(res);
term.prompt();
});
} else if ('l' == cmd || 'list' == cmd) {
if (!client) {
self.printNotConnected();
return;
}
var from = client.currentSourceLine - 5;
var to = client.currentSourceLine + 5;
client.reqSource(from, to, function(res) {
var lines = res.source.split('\n');
for (var i = 0; i < lines.length; i++) {
var lineno = res.fromLine + i + 1;
if (lineno < from || lineno > to) continue;
if (lineno == 1) {
// The first line needs to have the module wrapper filtered out of
// it.
var wrapper = require('module').wrapper[0];
lines[i] = lines[i].slice(wrapper.length);
}
if (lineno == 1 + client.currentSourceLine) {
var nchars = intChars(lineno);
var pointer = '';
for (var j = 0; j < nchars - 1; j++) {
pointer += '=';
}
pointer += '>';
console.log(pointer + ' ' + lines[i]);
} else {
console.log(leftPad(lineno) + ' ' + lines[i]);
}
}
term.prompt();
});
} else if (/^backtrace/.test(cmd) || /^bt/.test(cmd)) {
if (!client) {
self.printNotConnected();
return;
}
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client.reqBacktrace(function(bt) {
if (/full/.test(cmd)) {
console.log(bt);
} else if (bt.totalFrames == 0) {
console.log('(empty stack)');
} else {
var result = '';
for (j = 0; j < bt.frames.length; j++) {
if (j != 0) result += '\n';
result += bt.frames[j].text;
}
console.log(result);
}
term.prompt();
});
} else if (cmd == 'scripts' || cmd == 'scripts full') {
if (!client) {
self.printNotConnected();
return;
}
self.printScripts(cmd.indexOf('full') > 0);
term.prompt();
} else if (/^c(ontinue)?/.test(cmd)) {
if (!client) {
self.printNotConnected();
return;
}
self.pause();
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client.reqContinue(function() {
self.resume();
});
} else if (/^k(ill)?/.test(cmd)) {
if (!client) {
self.printNotConnected();
return;
}
// kill
if (self.child) {
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self.killQuestion(function(yes) {
if (yes) {
self.killChild();
} else {
self._lastCommand = null;
}
});
} else {
self.term.prompt();
}
} else if (/^next/.test(cmd) || /^n/.test(cmd)) {
if (!client) {
self.printNotConnected();
return;
}
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client.step('next', 1, function(res) {
// Wait for break point. (disable raw mode?)
});
} else if (/^step/.test(cmd) || /^s/.test(cmd)) {
if (!client) {
self.printNotConnected();
return;
}
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client.step('in', 1, function(res) {
// Wait for break point. (disable raw mode?)
});
} else if (/^print/.test(cmd) || /^p/.test(cmd)) {
if (!client) {
self.printNotConnected();
return;
}
var i = cmd.indexOf(' ');
if (i < 0) {
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console.log('print [expression]');
term.prompt();
} else {
cmd = cmd.slice(i);
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client.reqEval(cmd, function(res) {
if (res) {
console.log(res.text);
} else {
console.log(res);
}
term.prompt();
});
}
} else {
if (!/^\s*$/.test(cmd)) {
// If it's not all white-space print this error message.
console.log('Unknown command "%s". Try "help"', cmd);
}
term.prompt();
}
};
Interface.prototype.yesNoQuestion = function(prompt, cb) {
var self = this;
self.resume();
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this.term.question(prompt, function(answer) {
if (/^y(es)?$/i.test(answer)) {
cb(true);
} else if (/^n(o)?$/i.test(answer)) {
cb(false);
} else {
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console.log('Please answer y or n.');
self.restartQuestion(cb);
}
});
};
Interface.prototype.restartQuestion = function(cb) {
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this.yesNoQuestion('The program being debugged has been started already.\n' +
'Start it from the beginning? (y or n) ', cb);
};
Interface.prototype.killQuestion = function(cb) {
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this.yesNoQuestion('Kill the program being debugged? (y or n) ', cb);
};
Interface.prototype.quitQuestion = function(cb) {
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this.yesNoQuestion('A debugging session is active. Quit anyway? (y or n) ',
cb);
};
Interface.prototype.killChild = function() {
if (this.child) {
this.child.kill();
this.child = null;
}
if (this.client) {
this.client.destroy();
this.client = null;
}
this.resume();
};
Interface.prototype.trySpawn = function(cb) {
var self = this;
this.killChild();
this.child = spawn(process.execPath, args, { customFds: [0, 1, 2] });
this.pause();
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setTimeout(function() {
process.stdout.write('connecting...');
var client = self.client = new Client();
client.connect(exports.port);
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client.once('ready', function() {
process.stdout.write('ok\r\n');
// since we did debug-brk, we're hitting a break point immediately
// continue before anything else.
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client.reqContinue(function() {
if (cb) cb();
});
});
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client.on('close', function() {
console.log('\nprogram terminated');
self.client = null;
self.killChild();
if (!self.quitting) self.term.prompt();
});
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client.on('unhandledResponse', function(res) {
console.log('\r\nunhandled res:');
console.log(res);
self.term.prompt();
});
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client.on('break', function(res) {
self.handleBreak(res.body);
});
}, 100);
};
Interface.prototype.printNotConnected = function() {
console.log("Program not running. Try 'run'.");
this.term.prompt();
};
// argument full tells if it should display internal node scripts or not
Interface.prototype.printScripts = function(displayNatives) {
var client = this.client;
var text = '';
for (var id in client.scripts) {
var script = client.scripts[id];
if (typeof script == 'object' && script.name) {
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if (displayNatives ||
script.name == client.currentScript ||
!script.isNative) {
text += script.name == client.currentScript ? '* ' : ' ';
text += script.name + '\n';
}
}
}
process.stdout.write(text);
};