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438 lines (350 loc) · 11.6 KB
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// Hello, and welcome to hacking node.js!
//
// This file is invoked by node::Load in src/node.cc, and responsible for
// bootstrapping the node.js core. Special caution is given to the performance
// of the startup process, so many dependencies are invoked lazily.
(function(process) {
global = this;
function startup() {
startup.globalVariables();
startup.globalTimeouts();
startup.globalConsole();
startup.processAssert();
startup.processNextTick();
startup.processStdio();
startup.processKillAndExit();
startup.processSignalHandlers();
startup.removedMethods();
startup.resolveArgv0();
if (startup.runThirdPartyMain()) {
return;
}
if (startup.runDebugger()) {
return;
}
if (startup.runScript()) {
return;
}
if (startup.runEval()) {
return;
}
startup.runRepl();
}
startup.globalVariables = function() {
global.process = process;
global.global = global;
global.GLOBAL = global;
global.root = global;
global.Buffer = NativeModule.require('buffer').Buffer;
};
startup.globalTimeouts = function() {
global.setTimeout = function() {
var t = NativeModule.require('timers');
return t.setTimeout.apply(this, arguments);
};
global.setInterval = function() {
var t = NativeModule.require('timers');
return t.setInterval.apply(this, arguments);
};
global.clearTimeout = function() {
var t = NativeModule.require('timers');
return t.clearTimeout.apply(this, arguments);
};
global.clearInterval = function() {
var t = NativeModule.require('timers');
return t.clearInterval.apply(this, arguments);
};
};
startup.globalConsole = function() {
global.__defineGetter__('console', function() {
return NativeModule.require('console');
});
};
startup._lazyConstants = null;
startup.lazyConstants = function() {
if (!startup._lazyConstants) {
startup._lazyConstants = process.binding('constants');
}
return startup._lazyConstants;
};
var assert;
startup.processAssert = function() {
// Note that calls to assert() are pre-processed out by JS2C for the
// normal build of node. They persist only in the node_g build.
// Similarly for debug().
assert = process.assert = function(x, msg) {
if (!x) throw new Error(msg || 'assertion error');
};
};
startup.processNextTick = function() {
var nextTickQueue = [];
process._tickCallback = function() {
var l = nextTickQueue.length;
if (l === 0) return;
try {
for (var i = 0; i < l; i++) {
nextTickQueue[i]();
}
}
catch (e) {
nextTickQueue.splice(0, i + 1);
if (i + 1 < l) {
process._needTickCallback();
}
throw e; // process.nextTick error, or 'error' event on first tick
}
nextTickQueue.splice(0, l);
};
process.nextTick = function(callback) {
nextTickQueue.push(callback);
process._needTickCallback();
};
};
startup.processStdio = function() {
var stdout, stdin;
process.__defineGetter__('stdout', function() {
if (stdout) return stdout;
var binding = process.binding('stdio'),
net = NativeModule.require('net'),
fs = NativeModule.require('fs'),
tty = NativeModule.require('tty'),
fd = binding.stdoutFD;
if (binding.isatty(fd)) {
stdout = new tty.WriteStream(fd);
} else if (binding.isStdoutBlocking()) {
stdout = new fs.WriteStream(null, {fd: fd});
} else {
stdout = new net.Stream(fd);
// FIXME Should probably have an option in net.Stream to create a
// stream from an existing fd which is writable only. But for now
// we'll just add this hack and set the `readable` member to false.
// Test: ./node test/fixtures/echo.js < /etc/passwd
stdout.readable = false;
}
return stdout;
});
var stderr = process.stderr = {
writable: true,
readable: false,
write: process.binding('stdio').writeError
};
stderr.end = stderr.destroy = stderr.destroySoon = function() { };
process.__defineGetter__('stdin', function() {
if (stdin) return stdin;
var binding = process.binding('stdio'),
net = NativeModule.require('net'),
fs = NativeModule.require('fs'),
tty = NativeModule.require('tty'),
fd = binding.openStdin();
if (binding.isatty(fd)) {
stdin = new tty.ReadStream(fd);
} else if (binding.isStdinBlocking()) {
stdin = new fs.ReadStream(null, {fd: fd});
} else {
stdin = new net.Stream(fd);
stdin.readable = true;
}
return stdin;
});
process.openStdin = function() {
process.stdin.resume();
return process.stdin;
};
};
startup.processKillAndExit = function() {
process.exit = function(code) {
process.emit('exit', code || 0);
process.reallyExit(code || 0);
};
process.kill = function(pid, sig) {
sig = sig || 'SIGTERM';
if (!startup.lazyConstants()[sig]) {
throw new Error('Unknown signal: ' + sig);
}
process._kill(pid, startup.lazyConstants()[sig]);
};
};
startup.processSignalHandlers = function() {
// Load events module in order to access prototype elements on process like
// process.addListener.
var events = NativeModule.require('events');
var signalWatchers = {};
var addListener = process.addListener;
var removeListener = process.removeListener;
function isSignal(event) {
return event.slice(0, 3) === 'SIG' && startup.lazyConstants()[event];
}
// Wrap addListener for the special signal types
process.on = process.addListener = function(type, listener) {
var ret = addListener.apply(this, arguments);
if (isSignal(type)) {
if (!signalWatchers.hasOwnProperty(type)) {
var b = process.binding('signal_watcher');
var w = new b.SignalWatcher(startup.lazyConstants()[type]);
w.callback = function() { process.emit(type); };
signalWatchers[type] = w;
w.start();
} else if (this.listeners(type).length === 1) {
signalWatchers[event].start();
}
}
return ret;
};
process.removeListener = function(type, listener) {
var ret = removeListener.apply(this, arguments);
if (isSignal(type)) {
assert(signalWatchers.hasOwnProperty(type));
if (this.listeners(type).length === 0) {
signalWatchers[type].stop();
}
}
return ret;
};
};
startup._removedProcessMethods = {
'assert': 'process.assert() use require("assert").ok() instead',
'debug': 'process.debug() use console.error() instead',
'error': 'process.error() use console.error() instead',
'watchFile': 'process.watchFile() has moved to fs.watchFile()',
'unwatchFile': 'process.unwatchFile() has moved to fs.unwatchFile()',
'mixin': 'process.mixin() has been removed.',
'createChildProcess': 'childProcess API has changed. See doc/api.txt.',
'inherits': 'process.inherits() has moved to sys.inherits.',
'_byteLength': 'process._byteLength() has moved to Buffer.byteLength',
};
startup.removedMethods = function() {
for (var method in startup._removedProcessMethods) {
var reason = startup._removedProcessMethods[method];
process[method] = startup._removedMethod(reason);
}
};
startup._removedMethod = function(reason) {
return function() {
throw new Error(reason);
};
};
startup.resolveArgv0 = function() {
var cwd = process.cwd();
var isWindows = process.platform === 'win32';
// Make process.argv[0] into a full path, but only touch argv[0] if it's
// not a system $PATH lookup.
// TODO: Make this work on Windows as well. Note that "node" might
// execute cwd\node.exe, or some %PATH%\node.exe on Windows,
// and that every directory has its own cwd, so d:node.exe is valid.
var argv0 = process.argv[0];
if (!isWindows && argv0.indexOf('/') !== -1 && argv0.charAt(0) !== '/') {
var path = NativeModule.require('path');
process.argv[0] = path.join(cwd, process.argv[0]);
}
};
startup.runThirdPartyMain = function() {
// To allow people to extend Node in different ways, this hook allows
// one to drop a file lib/_third_party_main.js into the build directory
// which will be executed instead of Node's normal loading.
if (!NativeModule.exists('_third_party_main')) {
return;
}
process.nextTick(function() {
NativeModule.require('_third_party_main');
});
return true;
};
startup.runDebugger = function() {
if (!(process.argv[1] == 'debug')) {
return;
}
// Start the debugger agent
var d = NativeModule.require('_debugger');
d.start();
return true;
};
startup.runScript = function() {
if (!process.argv[1]) {
return;
}
// make process.argv[1] into a full path
if (!(/^http:\/\//).exec(process.argv[1])) {
var path = NativeModule.require('path');
process.argv[1] = path.resolve(process.argv[1]);
}
var Module = NativeModule.require('module');
// REMOVEME: nextTick should not be necessary. This hack to get
// test/simple/test-exception-handler2.js working.
process.nextTick(Module.runMain);
return true;
};
startup.runEval = function() {
// -e, --eval
if (!process._eval) {
return;
}
var Module = NativeModule.require('module');
var rv = new Module()._compile('return eval(process._eval)', 'eval');
console.log(rv);
return true;
};
startup.runRepl = function() {
var Module = NativeModule.require('module');
// REPL
Module.requireRepl().start();
};
// Below you find a minimal module system, which is used to load the node
// core modules found in lib/*.js. All core modules are compiled into the
// node binary, so they can be loaded faster.
var Script = process.binding('evals').Script;
var runInThisContext = Script.runInThisContext;
function NativeModule(id) {
this.filename = id + '.js';
this.id = id;
this.exports = {};
this.loaded = false;
}
NativeModule.functionid = 0;
NativeModule._source = process.binding('natives');
NativeModule._cache = {};
NativeModule.require = function(id) {
if (id == 'native_module') {
return NativeModule;
}
var cached = NativeModule.getCached(id);
if (cached) {
return cached.exports;
}
if (!NativeModule.exists(id)) {
throw new Error('No such native module ' + id);
}
var nativeModule = new NativeModule(id);
nativeModule.compile();
nativeModule.cache();
return nativeModule.exports;
};
NativeModule.getCached = function(id) {
return NativeModule._cache[id];
}
NativeModule.exists = function(id) {
return (id in NativeModule._source);
}
NativeModule.getSource = function(id) {
return NativeModule._source[id];
}
NativeModule.wrap = function(script) {
return NativeModule.wrapper[0] +
script +
NativeModule.wrapper[1];
};
NativeModule.wrapper = [
'(function (exports, require, module, __filename, __dirname) { ',
'\n});'
];
NativeModule.prototype.compile = function() {
var source = NativeModule.getSource(this.id);
source = NativeModule.wrap(source);
var fn = runInThisContext(source, this.filename, true);
fn(this.exports, NativeModule.require, this, this.filename);
this.loaded = true;
};
NativeModule.prototype.cache = function() {
NativeModule._cache[this.id] = this;
};
startup();
});