node/lib/_debugger.js at master · elarkin/node · GitHub

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// Copyright Joyent, Inc. and other Node contributors.

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

var net = require('net'),

repl = require('repl'),

vm = require('vm'),

util = require('util'),

inherits = util.inherits,

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 = {};

this.breakpoints = [];

// 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') {

return;

}

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) {

var cb,

index = -1;

this._reqCallbacks.some(function(fn, i) {

if (fn.request_seq == res.body.request_seq) {

cb = fn;

index = i;

return true;

}

});

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(index, 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);

});

};

Client.prototype.reqScopes = function(cb) {

var self = this,

req = {

command: 'scopes',

arguments: {}

};

this.req(req, function(res) {

if (!res.success) return cb(Error(res.message) || true);

var refs = res.body.scopes.map(function(scope) {

return scope.object.ref;

});

self.reqLookup(refs, function(res) {

if (!res.success) return cb(Error(res.message) || true)

var globals = Object.keys(res.body).map(function(key) {

return res.body[key].properties.map(function(prop) {

return prop.name;

});

cb(null, globals.reverse());

});

};

// 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) {

if (!bt.frames) {

// ??

cb({});

return;

}

var frame = bt.frames[self.currentFrame];

var evalFrames = frame.scopes.map(function(s) {

if (!s) return;

var x = bt.frames[s.index];

if (!x) return;

return x.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.currentFrame = NO_FRAME;

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.setBreakpoint = function(req, cb) {

var req = {

command: 'setbreakpoint',

arguments: req

};

this.req(req, function(res) {

if (cb) cb(res);

});

};

Client.prototype.clearBreakpoint = function(req, cb) {

var req = {

command: 'clearbreakpoint',

arguments: req

};

this.req(req, 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.success && (res.message || true), res.body);

});

};

// client.next(1, cb);

Client.prototype.step = function(action, count, cb) {

var req = {

command: 'continue',

arguments: { stepaction: action, stepcount: count }

};

this.currentFrame = NO_FRAME;

this.req(req, function(res) {

if (cb) cb(res);

});

};

Client.prototype.mirrorObject = function(handle, depth, cb) {

var self = this;

var val;

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,

waiting = 1;

if (handle.className == 'Array') {

mirror = [];

} else {

mirror = {};

}

var keyValues = [];

handle.properties.forEach(function(prop, i) {

var value = res.body[prop.ref];

var mirrorValue;

if (value) {

mirrorValue = value.value ? value.value : value.text;

} else {

mirrorValue = '[?]';

}

if (Array.isArray(mirror) &&

typeof prop.name != 'number') {

// Skip the 'length' property.

return;

}

keyValues[i] = {

name: prop.name,

value: mirrorValue

};

if (value && value.handle && depth > 0) {

waiting++;

self.mirrorObject(value, depth - 1, function(result) {

keyValues[i].value = result;

waitForOthers();

});

}

});

waitForOthers();

function waitForOthers() {

if (--waiting === 0 && cb) {

keyValues.forEach(function(kv) {

mirror[kv.name] = kv.value;

});

cb(mirror);

}

};

});

return;

} else if (handle.type === 'function') {

val = function() {};

} else if (handle.value) {

val = handle.value;

} else if (handle.type === 'undefined') {

val = undefined;

} else {

val = handle;

}

process.nextTick(function() {

cb(val);

});

};

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 l...' }

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 = [

[

'run (r)',

'cont (c)',

'next (n)',

'step (s)',

'out (o)',

'backtrace (bt)',

'setBreakpoint (sb)',

'clearBreakpoint (cb)',

[

'repl',

'restart',

'kill',

'list',

'scripts',

'breakpoints',

'version'

]

];

var helpMessage = 'Commands: ' + commands.map(function(group) {

return group.join(', ');

}).join(',\n');

function SourceUnderline(sourceText, position) {

if (!sourceText) return '';

var head = sourceText.slice(0, position),

tail = sourceText.slice(position);

// Colourize char if stdout supports colours

if (process.stdout.isTTY) {

tail = tail.replace(/(.+?)([^\w]|$)/, '\033[32m$1\033[39m$2');

}

// Return source line with coloured char at `position`

return [

head,

tail

].join('');

}

function SourceInvocation(body) {

return body.invocationText.replace(/\n/g, '')

.replace(/^([^(]*)$.*$([^)]*)$/, '$1(...)$2');

}

function SourceInfo(body) {

var result = 'break in ' + SourceInvocation(body);

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 repl-enabled debugger interface which is invoked on

// "node debug"

function Interface() {

var self = this,

child;

process.on('exit', function() {

self.killChild();

});

this.repl = new repl.REPLServer('debug> ', null,

this.controlEval.bind(this));

this.repl.rli.addListener('close', function() {

self.killed = true;

self.killChild();

});

// Lift all instance methods to repl context

var proto = Interface.prototype,

ignored = ['pause', 'resume', 'exitRepl', 'handleBreak',

'requireConnection', 'killChild', 'trySpawn',

'controlEval', 'debugEval', 'print', 'childPrint'],

shortcut = {

'run': 'r',

'cont': 'c',

'next': 'n',

'step': 's',

'out': 'o',

'backtrace': 'bt',

'setBreakpoint': 'sb',

'clearBreakpoint': 'cb'

};

function defineProperty(key, protoKey) {

// Check arity

if (proto[protoKey].length === 0) {

Object.defineProperty(self.repl.context, key, {

get: proto[protoKey].bind(self),

enumerable: true

});

} else {

self.repl.context[key] = proto[protoKey].bind(self);

}

};

for (var i in proto) {

if (proto.hasOwnProperty(i) && ignored.indexOf(i) === -1) {

defineProperty(i, i);

if (shortcut[i]) defineProperty(shortcut[i], i);

}

this.killed = false;

this.waiting = null;

this.paused = 0;

this.context = this.repl.context;

this.history = {

debug: [],

control: []

};

this.breakpoints = [];

};

// Stream control

Interface.prototype.pause = function() {

if (this.killed || this.paused++ > 0) return false;

this.repl.rli.pause();

process.stdin.pause();

};

Interface.prototype.resume = function(silent) {

if (this.killed || this.paused === 0 || --this.paused !== 0) return false;

this.repl.rli.resume();

if (silent !== true) {

this.repl.displayPrompt();

}

process.stdin.resume();

if (this.waiting) {

this.waiting();

this.waiting = null;

}

};

// Output

Interface.prototype.print = function(text) {

if (this.killed) return;

if (process.stdout.isTTY) {

process.stdout.cursorTo(0);

process.stdout.clearLine(1);

}

process.stdout.write(typeof text === 'string' ? text : util.inspect(text));

process.stdout.write('\n');

};

Interface.prototype.childPrint = function(text) {

this.print(text.toString().split(/\r\n|\r|\n/g).filter(function(chunk) {

return chunk;

}).map(function(chunk) {

return '< ' + chunk;

}).join('\n'));

this.repl.displayPrompt();

};

Interface.prototype.error = function(text) {

this.print(text);

this.resume();

};

Interface.prototype.handleBreak = function(r) {

this.pause();

this.client.currentSourceLine = r.sourceLine;

this.client.currentSourceLineText = r.sourceLineText;

this.client.currentSourceColumn = r.sourceColumn;

this.client.currentFrame = 0;

this.client.currentScript = r.script.name;

this.print(SourceInfo(r));

this.list(2);

this.resume();

};

Interface.prototype.requireConnection = function() {

if (!this.client) {

this.error('App isn\'t running... Try `run` instead');

return false;

}

return true;

};

Interface.prototype.controlEval = function(code, context, filename, callback) {

try {

var result = vm.runInContext(code, context, filename);

if (this.paused === 0) return callback(null, result);

this.waiting = function() {

callback(null, result);

};

} catch (e) {

callback(e);

}

};

Interface.prototype.debugEval = function(code, context, filename, callback) {

var self = this,

client = this.client;

if (code === '.scope') {

client.reqScopes(callback);

return;

}

var frame;

if (client.currentFrame === NO_FRAME) {

frame = NO_FRAME;

};

self.pause();

client.reqFrameEval(code, frame, function(res) {

if (!res.success) {

if (res.message) {

callback(res.message);

} else {

callback(null);

}

self.resume(true);

return;

}

client.mirrorObject(res.body, 3, function(mirror) {

callback(null, mirror);

self.resume(true);

});

};

// Commands

function intChars(n) {

// TODO dumb:

if (n < 50) {

return 3;

} else if (n < 950) {

return 4;

} else if (n < 9950) {

return 5;

} else {

return 6;

}

function leftPad(n, prefix) {

var s = n.toString();

var nchars = intChars(n);

var nspaces = nchars - s.length;

for (var i = 0; i < nspaces; i++) {

s = (prefix || ' ') + s;

}

return s;

}

// Print help message

Interface.prototype.help = function() {

this.print(helpMessage);

};

// Run script

Interface.prototype.run = function() {

if (this.child) {

this.error('App is already running... Try `restart` instead');

} else {

this.trySpawn();

}

};

// Restart script

Interface.prototype.restart = function() {

if (!this.requireConnection()) return;

var self = this;

self.pause();

self.killChild();

// XXX need to wait a little bit for the restart to work?

setTimeout(function() {

self.trySpawn();

self.resume();

}, 1000);

};

// Print version

Interface.prototype.version = function() {

if (!this.requireConnection()) return;

var self = this;

this.pause();

this.client.reqVersion(function(v) {

self.print(v);

self.resume();

});

};

// List source code

Interface.prototype.list = function() {

if (!this.requireConnection()) return;

var self = this,

client = this.client,

delta = arguments[0] || 5,

from = client.currentSourceLine - delta + 1,

to = client.currentSourceLine + delta + 1;

self.pause();

client.reqSource(from, to, function(err, res) {

if (err || !res) {

return self.error('You can\'t list source code right now');

}

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);

}

var breakpoint = client.breakpoints.some(function(bp) {

return bp.script === client.currentScript &&

bp.line == lineno;

});

if (lineno == 1 + client.currentSourceLine) {

var nchars = intChars(lineno),

pointer = breakpoint ? '*' : '=';

for (var j = 1; j < nchars - 1; j++) {

pointer += '=';

}

pointer += '>';

self.print(pointer + ' ' +

SourceUnderline(lines[i], client.currentSourceColumn));

} else {

self.print(leftPad(lineno, breakpoint && '*') + ' ' + lines[i]);

}

self.resume();

});

};

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