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1074 lines (861 loc) · 23.6 KB
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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;
exports.start = function() {
if (process.argv.length < 3) {
console.error("Usage: node debug script.js");
process.exit(1);
}
var interface = new Interface();
process.on('uncaughtException', function (e) {
console.error("There was an internal error in Node's debugger. " +
"Please report this bug.");
console.error(e.message);
console.error(e.stack);
if (interface.child) interface.child.kill();
process.exit(1);
});
};
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();
//
// p.onResponse = function(res) {
// // do stuff with response from V8
// };
//
// socket.setEncoding('utf8');
// 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:
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);
}
inherits(Client, net.Stream);
exports.Client = Client;
Client.prototype._addHandle = function(desc) {
if (typeof desc != 'object' || typeof desc.handle != 'number') {
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) {
this.req({ command: 'version' } , function(res) {
if (cb) cb(res.body.V8Version, res.running);
});
};
Client.prototype.reqLookup = function(refs, cb) {
var self = this;
// TODO: We have a cache of handle's we've already seen in this.handles
// This can be used if we're careful.
var req = {
command: 'lookup',
arguments: {
handles: refs
}
};
this.req(req, function(res) {
if (res.success) {
for (var ref in res.body) {
if (typeof res.body[ref] == 'object') {
self._addHandle(res.body[ref]);
}
}
}
if (cb) cb(res);
});
};
// This is like reqEval, except it will look up the expression in each of the
// scopes associated with the current frame.
Client.prototype.reqEval = function(expression, cb) {
var self = this;
if (this.currentFrame == NO_FRAME) {
// Only need to eval in global scope.
this.reqFrameEval(expression, NO_FRAME, cb);
return;
}
// Otherwise we need to get the current frame to see which scopes it has.
this.reqBacktrace(function (bt) {
var frame = bt.frames[self.currentFrame];
var evalFrames = frame.scopes.map(function(s) {
return bt.frames[s.index].index;
});
self._reqFramesEval(expression, evalFrames, cb);
});
};
// Finds the first scope in the array in which the epxression evals.
Client.prototype._reqFramesEval = function(expression, evalFrames, cb) {
if (evalFrames.length == 0) {
// Just eval in global scope.
this.reqFrameEval(expression, NO_FRAME, cb);
return;
}
var self = this;
var i = evalFrames.shift();
this.reqFrameEval(expression, i, function(res) {
if (res.success) {
if (cb) cb(res);
} else {
self._reqFramesEval(expression, evalFrames, cb);
}
});
};
Client.prototype.reqFrameEval = function(expression, frame, cb) {
var self = this;
var req = {
command: 'evaluate',
arguments: { expression: expression }
};
if (frame == NO_FRAME) {
req.arguments.global = true;
} else {
req.arguments.frame = frame;
}
this.req(req, function(res) {
if (res.success) {
self._addHandle(res.body);
}
if (cb) cb(res);
});
};
// reqBacktrace(cb)
// TODO: from, to, bottom
Client.prototype.reqBacktrace = function(cb) {
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;
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) {
this.req({ command: 'continue' }, function(res) {
if (cb) cb(res);
});
};
Client.prototype.listbreakpoints = function(cb) {
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 }
};
this.req(req, function(res) {
if (cb) cb(res);
});
};
Client.prototype.mirrorObject = function(handle, cb) {
var self = this;
if (handle.type == 'object') {
// The handle looks something like this:
// { handle: 8,
// type: 'object',
// className: 'Object',
// constructorFunction: { ref: 9 },
// protoObject: { ref: 4 },
// prototypeObject: { ref: 2 },
// properties: [ { name: 'hello', propertyType: 1, ref: 10 } ],
// text: '#<an Object>' }
// For now ignore the className and constructor and prototype.
// TJ's method of object inspection would probably be good for this:
// https://groups.google.com/forum/?pli=1#!topic/nodejs-dev/4gkWBOimiOg
var propertyRefs = handle.properties.map(function(p) {
return p.ref;
});
this.reqLookup(propertyRefs, function(res) {
if (!res.success) {
console.error("problem with reqLookup");
if (cb) cb(handle);
return;
}
var mirror;
if (handle.className == 'Array') {
mirror = [];
} else {
mirror = {};
}
for (var i = 0; i < handle.properties.length; i++) {
var value = res.body[handle.properties[i].ref];
var mirrorValue = value.value ? value.value : value.text;
if (Array.isArray(mirror) &&
typeof handle.properties[i].name != 'number') {
// Skip the 'length' property.
continue;
}
mirror[handle.properties[i].name] = mirrorValue;
}
if (cb) cb(mirror);
});
} else if (handle.value) {
process.nextTick(function() {
cb(handle.value);
});
} else {
process.nextTick(function() {
cb(handle);
});
}
};
Client.prototype.fullTrace = function(cb) {
var self = this;
this.reqBacktrace(function(trace) {
var refs = [];
for (var i = 0; i < trace.frames.length; i++) {
var frame = trace.frames[i];
// looks like this:
// { type: 'frame',
// index: 0,
// receiver: { ref: 1 },
// func: { ref: 0 },
// script: { ref: 7 },
// constructCall: false,
// atReturn: false,
// debuggerFrame: false,
// arguments: [],
// locals: [],
// position: 160,
// line: 7,
// column: 2,
// sourceLineText: ' debugger;',
// scopes: [ { type: 1, index: 0 }, { type: 0, index: 1 } ],
// text: '#00 blah() /home/ryan/projects/node/test-debug.js line 8 column 3 (position 161)' }
refs.push(frame.script.ref);
refs.push(frame.func.ref);
refs.push(frame.receiver.ref);
}
self.reqLookup(refs, function(res) {
for (var i = 0; i < trace.frames.length; i++) {
var frame = trace.frames[i];
frame.script = res.body[frame.script.ref];
frame.func = res.body[frame.func.ref];
frame.receiver = res.body[frame.receiver.ref];
}
if (cb) cb(trace);
});
});
}
var commands = [
'backtrace',
'continue',
'help',
'info breakpoints',
'kill',
'list',
'next',
'print',
'quit',
'run',
'scripts',
'step',
'version',
];
var helpMessage = 'Commands: ' + commands.join(', ');
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++) {
if (sourceText[i] == '\t') {
underline += '\t';
} else {
underline += ' ';
}
}
underline += '^';
// Return the source line text with the underline beneath.
return sourceText + '\n' + underline;
}
function SourceInfo(body) {
var result = '';
if (body.script) {
if (body.script.name) {
result += body.script.name;
} else {
result += '[unnamed]';
}
}
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, function (line) {
return self.complete(line);
});
var child;
var client;
var term;
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;
process.on('SIGINT', function() {
self.handleSIGINT();
});
term.on('SIGINT', function() {
self.handleSIGINT();
});
term.on('attemptClose', 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.complete = function(line) {
// Match me with a command.
var matches = [];
// Remove leading whitespace
line = line.replace(/^\s*/, '');
for (var i = 0; i < commands.length; i++) {
if (commands[i].indexOf(line) >= 0) {
matches.push(commands[i]);
}
}
return [matches, line];
};
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) {
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() {
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);
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) {
self.restartQuestion(function(yes) {
if (!yes) {
self._lastCommand = null;
term.prompt();
} else {
console.log('restarting...');
self.killChild();
// XXX need to wait a little bit for the restart to work?
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;
}
client.reqVersion(function(v) {
console.log(v);
term.prompt();
});
} else if (/info +breakpoints/.test(cmd)) {
if (!client) {
self.printNotConnected();
return;
}
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;
}
client.fullTrace(function(bt) {
if (bt.totalFrames == 0) {
console.log('(empty stack)');
} else {
var text = '';
var firstFrameNative = bt.frames[0].script.isNative;
for (var i = 0; i < bt.frames.length; i++) {
var frame = bt.frames[i];
if (!firstFrameNative && frame.script.isNative) break;
text += '#' + i + ' ';
if (frame.func.inferredName && frame.func.inferredName.length > 0) {
text += frame.func.inferredName + ' ';
}
text += require('path').basename(frame.script.name) + ':';
text += (frame.line + 1) + ':' + (frame.column + 1);
text += '\n';
}
console.log(text);
}
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();
client.reqContinue(function() {
self.resume();
});
} else if (/^k(ill)?/.test(cmd)) {
if (!client) {
self.printNotConnected();
return;
}
// kill
if (self.child) {
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;
}
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;
}
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) {
console.log('print [expression]');
term.prompt();
} else {
cmd = cmd.slice(i);
client.reqEval(cmd, function(res) {
if (!res.success) {
console.log(res.message);
term.prompt();
return;
}
client.mirrorObject(res.body, function(mirror) {
console.log(mirror);
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();
this.term.question(prompt, function(answer) {
if (/^y(es)?$/i.test(answer)) {
cb(true);
} else if (/^n(o)?$/i.test(answer)) {
cb(false);
} else {
console.log('Please answer y or n.');
self.restartQuestion(cb);
}
});
};
Interface.prototype.restartQuestion = function(cb) {
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) {
this.yesNoQuestion('Kill the program being debugged? (y or n) ', cb);
};
Interface.prototype.quitQuestion = function(cb) {
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();
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