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node.js
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962 lines (806 loc) · 27.6 KB
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// Hello, and welcome to hacking node.js!
//
// This file is invoked by node::LoadEnvironment in src/node.cc, and is
// responsible for bootstrapping the node.js core. As special caution is given
// to the performance of the startup process, many dependencies are invoked
// lazily.
'use strict';
(function(process) {
this.global = this;
function startup() {
var EventEmitter = NativeModule.require('events');
process.__proto__ = Object.create(EventEmitter.prototype, {
constructor: {
value: process.constructor
}
});
EventEmitter.call(process);
process.EventEmitter = EventEmitter; // process.EventEmitter is deprecated
// do this good and early, since it handles errors.
startup.processFatal();
startup.globalVariables();
startup.globalTimeouts();
startup.globalConsole();
startup.processAssert();
startup.processConfig();
startup.processNextTick();
startup.processPromises();
startup.processStdio();
startup.processKillAndExit();
startup.processSignalHandlers();
// Do not initialize channel in debugger agent, it deletes env variable
// and the main thread won't see it.
if (process.argv[1] !== '--debug-agent')
startup.processChannel();
startup.processRawDebug();
process.argv[0] = process.execPath;
// There are various modes that Node can run in. The most common two
// are running from a script and running the REPL - but there are a few
// others like the debugger or running --eval arguments. Here we decide
// which mode we run in.
if (NativeModule.exists('_third_party_main')) {
// 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.
process.nextTick(function() {
NativeModule.require('_third_party_main');
});
} else if (process.argv[1] == 'debug') {
// Start the debugger agent
var d = NativeModule.require('_debugger');
d.start();
} else if (process.argv[1] == '--debug-agent') {
// Start the debugger agent
var d = NativeModule.require('_debug_agent');
d.start();
} else {
// There is user code to be run
// If this is a worker in cluster mode, start up the communication
// channel. This needs to be done before any user code gets executed
// (including preload modules).
if (process.argv[1] && process.env.NODE_UNIQUE_ID) {
var cluster = NativeModule.require('cluster');
cluster._setupWorker();
// Make sure it's not accidentally inherited by child processes.
delete process.env.NODE_UNIQUE_ID;
}
if (process._eval != null) {
// User passed '-e' or '--eval' arguments to Node.
startup.preloadModules();
evalScript('[eval]');
} else if (process.argv[1]) {
// make process.argv[1] into a full path
var path = NativeModule.require('path');
process.argv[1] = path.resolve(process.argv[1]);
var Module = NativeModule.require('module');
// check if user passed `-c` or `--check` arguments to Node.
if (process._syntax_check_only != null) {
var vm = NativeModule.require('vm');
var fs = NativeModule.require('fs');
var internalModule = NativeModule.require('internal/module');
// read the source
var filename = Module._resolveFilename(process.argv[1]);
var source = fs.readFileSync(filename, 'utf-8');
// remove shebang and BOM
source = internalModule.stripBOM(source.replace(/^\#\!.*/, ''));
// compile the script, this will throw if it fails
new vm.Script(source, {filename: filename, displayErrors: true});
process.exit(0);
}
startup.preloadModules();
if (global.v8debug &&
process.execArgv.some(function(arg) {
return arg.match(/^--debug-brk(=[0-9]*)?$/);
})) {
// XXX Fix this terrible hack!
//
// Give the client program a few ticks to connect.
// Otherwise, there's a race condition where `node debug foo.js`
// will not be able to connect in time to catch the first
// breakpoint message on line 1.
//
// A better fix would be to somehow get a message from the
// global.v8debug object about a connection, and runMain when
// that occurs. --isaacs
var debugTimeout = +process.env.NODE_DEBUG_TIMEOUT || 50;
setTimeout(Module.runMain, debugTimeout);
} else {
// Main entry point into most programs:
Module.runMain();
}
} else {
var Module = NativeModule.require('module');
// If -i or --interactive were passed, or stdin is a TTY.
if (process._forceRepl || NativeModule.require('tty').isatty(0)) {
// REPL
var cliRepl = Module.requireRepl();
cliRepl.createInternalRepl(process.env, function(err, repl) {
if (err) {
throw err;
}
repl.on('exit', function() {
if (repl._flushing) {
repl.pause();
return repl.once('flushHistory', function() {
process.exit();
});
}
process.exit();
});
});
} else {
// Read all of stdin - execute it.
process.stdin.setEncoding('utf8');
var code = '';
process.stdin.on('data', function(d) {
code += d;
});
process.stdin.on('end', function() {
process._eval = code;
evalScript('[stdin]');
});
}
}
}
}
startup.globalVariables = function() {
global.process = process;
global.global = global;
global.GLOBAL = global;
global.root = global;
global.Buffer = NativeModule.require('buffer').Buffer;
process.domain = null;
process._exiting = false;
};
startup.globalTimeouts = function() {
const timers = NativeModule.require('timers');
global.clearImmediate = timers.clearImmediate;
global.clearInterval = timers.clearInterval;
global.clearTimeout = timers.clearTimeout;
global.setImmediate = timers.setImmediate;
global.setInterval = timers.setInterval;
global.setTimeout = timers.setTimeout;
};
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;
};
startup.processFatal = function() {
process._fatalException = function(er) {
var caught;
if (process.domain && process.domain._errorHandler)
caught = process.domain._errorHandler(er) || caught;
if (!caught)
caught = process.emit('uncaughtException', er);
// If someone handled it, then great. otherwise, die in C++ land
// since that means that we'll exit the process, emit the 'exit' event
if (!caught) {
try {
if (!process._exiting) {
process._exiting = true;
process.emit('exit', 1);
}
} catch (er) {
// nothing to be done about it at this point.
}
// if we handled an error, then make sure any ticks get processed
} else {
NativeModule.require('timers').setImmediate(process._tickCallback);
}
return caught;
};
};
var assert;
startup.processAssert = function() {
assert = process.assert = function(x, msg) {
if (!x) throw new Error(msg || 'assertion error');
};
};
startup.processConfig = function() {
// used for `process.config`, but not a real module
var config = NativeModule._source.config;
delete NativeModule._source.config;
// strip the gyp comment line at the beginning
config = config.split('\n')
.slice(1)
.join('\n')
.replace(/"/g, '\\"')
.replace(/'/g, '"');
process.config = JSON.parse(config, function(key, value) {
if (value === 'true') return true;
if (value === 'false') return false;
return value;
});
};
var addPendingUnhandledRejection;
var hasBeenNotifiedProperty = new WeakMap();
startup.processNextTick = function() {
var nextTickQueue = [];
var pendingUnhandledRejections = [];
var microtasksScheduled = false;
// Used to run V8's micro task queue.
var _runMicrotasks = {};
// *Must* match Environment::TickInfo::Fields in src/env.h.
var kIndex = 0;
var kLength = 1;
process.nextTick = nextTick;
// Needs to be accessible from beyond this scope.
process._tickCallback = _tickCallback;
process._tickDomainCallback = _tickDomainCallback;
// This tickInfo thing is used so that the C++ code in src/node.cc
// can have easy access to our nextTick state, and avoid unnecessary
// calls into JS land.
const tickInfo = process._setupNextTick(_tickCallback, _runMicrotasks);
_runMicrotasks = _runMicrotasks.runMicrotasks;
function tickDone() {
if (tickInfo[kLength] !== 0) {
if (tickInfo[kLength] <= tickInfo[kIndex]) {
nextTickQueue = [];
tickInfo[kLength] = 0;
} else {
nextTickQueue.splice(0, tickInfo[kIndex]);
tickInfo[kLength] = nextTickQueue.length;
}
}
tickInfo[kIndex] = 0;
}
function scheduleMicrotasks() {
if (microtasksScheduled)
return;
nextTickQueue.push({
callback: runMicrotasksCallback,
domain: null
});
tickInfo[kLength]++;
microtasksScheduled = true;
}
function runMicrotasksCallback() {
microtasksScheduled = false;
_runMicrotasks();
if (tickInfo[kIndex] < tickInfo[kLength] ||
emitPendingUnhandledRejections())
scheduleMicrotasks();
}
// Run callbacks that have no domain.
// Using domains will cause this to be overridden.
function _tickCallback() {
var callback, args, tock;
do {
while (tickInfo[kIndex] < tickInfo[kLength]) {
tock = nextTickQueue[tickInfo[kIndex]++];
callback = tock.callback;
args = tock.args;
// Using separate callback execution functions helps to limit the
// scope of DEOPTs caused by using try blocks and allows direct
// callback invocation with small numbers of arguments to avoid the
// performance hit associated with using `fn.apply()`
if (args === undefined) {
doNTCallback0(callback);
} else {
switch (args.length) {
case 1:
doNTCallback1(callback, args[0]);
break;
case 2:
doNTCallback2(callback, args[0], args[1]);
break;
case 3:
doNTCallback3(callback, args[0], args[1], args[2]);
break;
default:
doNTCallbackMany(callback, args);
}
}
if (1e4 < tickInfo[kIndex])
tickDone();
}
tickDone();
_runMicrotasks();
emitPendingUnhandledRejections();
} while (tickInfo[kLength] !== 0);
}
function _tickDomainCallback() {
var callback, domain, args, tock;
do {
while (tickInfo[kIndex] < tickInfo[kLength]) {
tock = nextTickQueue[tickInfo[kIndex]++];
callback = tock.callback;
domain = tock.domain;
args = tock.args;
if (domain)
domain.enter();
// Using separate callback execution functions helps to limit the
// scope of DEOPTs caused by using try blocks and allows direct
// callback invocation with small numbers of arguments to avoid the
// performance hit associated with using `fn.apply()`
if (args === undefined) {
doNTCallback0(callback);
} else {
switch (args.length) {
case 1:
doNTCallback1(callback, args[0]);
break;
case 2:
doNTCallback2(callback, args[0], args[1]);
break;
case 3:
doNTCallback3(callback, args[0], args[1], args[2]);
break;
default:
doNTCallbackMany(callback, args);
}
}
if (1e4 < tickInfo[kIndex])
tickDone();
if (domain)
domain.exit();
}
tickDone();
_runMicrotasks();
emitPendingUnhandledRejections();
} while (tickInfo[kLength] !== 0);
}
function doNTCallback0(callback) {
var threw = true;
try {
callback();
threw = false;
} finally {
if (threw)
tickDone();
}
}
function doNTCallback1(callback, arg1) {
var threw = true;
try {
callback(arg1);
threw = false;
} finally {
if (threw)
tickDone();
}
}
function doNTCallback2(callback, arg1, arg2) {
var threw = true;
try {
callback(arg1, arg2);
threw = false;
} finally {
if (threw)
tickDone();
}
}
function doNTCallback3(callback, arg1, arg2, arg3) {
var threw = true;
try {
callback(arg1, arg2, arg3);
threw = false;
} finally {
if (threw)
tickDone();
}
}
function doNTCallbackMany(callback, args) {
var threw = true;
try {
callback.apply(null, args);
threw = false;
} finally {
if (threw)
tickDone();
}
}
function TickObject(c, args) {
this.callback = c;
this.domain = process.domain || null;
this.args = args;
}
function nextTick(callback) {
// on the way out, don't bother. it won't get fired anyway.
if (process._exiting)
return;
var args;
if (arguments.length > 1) {
args = [];
for (var i = 1; i < arguments.length; i++)
args.push(arguments[i]);
}
nextTickQueue.push(new TickObject(callback, args));
tickInfo[kLength]++;
}
function emitPendingUnhandledRejections() {
var hadListeners = false;
while (pendingUnhandledRejections.length > 0) {
var promise = pendingUnhandledRejections.shift();
var reason = pendingUnhandledRejections.shift();
if (hasBeenNotifiedProperty.get(promise) === false) {
hasBeenNotifiedProperty.set(promise, true);
if (!process.emit('unhandledRejection', reason, promise)) {
// Nobody is listening.
// TODO(petkaantonov) Take some default action, see #830
} else {
hadListeners = true;
}
}
}
return hadListeners;
}
addPendingUnhandledRejection = function(promise, reason) {
pendingUnhandledRejections.push(promise, reason);
scheduleMicrotasks();
};
};
startup.processPromises = function() {
var promiseRejectEvent = process._promiseRejectEvent;
function unhandledRejection(promise, reason) {
hasBeenNotifiedProperty.set(promise, false);
addPendingUnhandledRejection(promise, reason);
}
function rejectionHandled(promise) {
var hasBeenNotified = hasBeenNotifiedProperty.get(promise);
if (hasBeenNotified !== undefined) {
hasBeenNotifiedProperty.delete(promise);
if (hasBeenNotified === true) {
process.nextTick(function() {
process.emit('rejectionHandled', promise);
});
}
}
}
process._setupPromises(function(event, promise, reason) {
if (event === promiseRejectEvent.unhandled)
unhandledRejection(promise, reason);
else if (event === promiseRejectEvent.handled)
rejectionHandled(promise);
else
NativeModule.require('assert').fail('unexpected PromiseRejectEvent');
});
};
function evalScript(name) {
var Module = NativeModule.require('module');
var path = NativeModule.require('path');
try {
var cwd = process.cwd();
} catch (e) {
// getcwd(3) can fail if the current working directory has been deleted.
// Fall back to the directory name of the (absolute) executable path.
// It's not really correct but what are the alternatives?
var cwd = path.dirname(process.execPath);
}
var module = new Module(name);
module.filename = path.join(cwd, name);
module.paths = Module._nodeModulePaths(cwd);
var script = process._eval;
var body = script;
script = 'global.__filename = ' + JSON.stringify(name) + ';\n' +
'global.exports = exports;\n' +
'global.module = module;\n' +
'global.__dirname = __dirname;\n' +
'global.require = require;\n' +
'return require("vm").runInThisContext(' +
JSON.stringify(body) + ', { filename: ' +
JSON.stringify(name) + ' });\n';
// Defer evaluation for a tick. This is a workaround for deferred
// events not firing when evaluating scripts from the command line,
// see https://github.com/nodejs/node/issues/1600.
process.nextTick(function() {
var result = module._compile(script, name + '-wrapper');
if (process._print_eval) console.log(result);
});
}
function createWritableStdioStream(fd) {
var stream;
var tty_wrap = process.binding('tty_wrap');
// Note stream._type is used for test-module-load-list.js
switch (tty_wrap.guessHandleType(fd)) {
case 'TTY':
var tty = NativeModule.require('tty');
stream = new tty.WriteStream(fd);
stream._type = 'tty';
break;
case 'FILE':
var fs = NativeModule.require('fs');
stream = new fs.SyncWriteStream(fd, { autoClose: false });
stream._type = 'fs';
break;
case 'PIPE':
case 'TCP':
var net = NativeModule.require('net');
stream = new net.Socket({
fd: fd,
readable: false,
writable: true
});
stream._type = 'pipe';
break;
default:
// Probably an error on in uv_guess_handle()
throw new Error('Implement me. Unknown stream file type!');
}
// For supporting legacy API we put the FD here.
stream.fd = fd;
stream._isStdio = true;
return stream;
}
startup.processStdio = function() {
var stdin, stdout, stderr;
process.__defineGetter__('stdout', function() {
if (stdout) return stdout;
stdout = createWritableStdioStream(1);
stdout.destroy = stdout.destroySoon = function(er) {
er = er || new Error('process.stdout cannot be closed.');
stdout.emit('error', er);
};
if (stdout.isTTY) {
process.on('SIGWINCH', function() {
stdout._refreshSize();
});
}
return stdout;
});
process.__defineGetter__('stderr', function() {
if (stderr) return stderr;
stderr = createWritableStdioStream(2);
stderr.destroy = stderr.destroySoon = function(er) {
er = er || new Error('process.stderr cannot be closed.');
stderr.emit('error', er);
};
if (stderr.isTTY) {
process.on('SIGWINCH', function() {
stderr._refreshSize();
});
}
return stderr;
});
process.__defineGetter__('stdin', function() {
if (stdin) return stdin;
var tty_wrap = process.binding('tty_wrap');
var fd = 0;
switch (tty_wrap.guessHandleType(fd)) {
case 'TTY':
var tty = NativeModule.require('tty');
stdin = new tty.ReadStream(fd, {
highWaterMark: 0,
readable: true,
writable: false
});
break;
case 'FILE':
var fs = NativeModule.require('fs');
stdin = new fs.ReadStream(null, { fd: fd, autoClose: false });
break;
case 'PIPE':
case 'TCP':
var net = NativeModule.require('net');
// It could be that process has been started with an IPC channel
// sitting on fd=0, in such case the pipe for this fd is already
// present and creating a new one will lead to the assertion failure
// in libuv.
if (process._channel && process._channel.fd === fd) {
stdin = new net.Socket({
handle: process._channel,
readable: true,
writable: false
});
} else {
stdin = new net.Socket({
fd: fd,
readable: true,
writable: false
});
}
// Make sure the stdin can't be `.end()`-ed
stdin._writableState.ended = true;
break;
default:
// Probably an error on in uv_guess_handle()
throw new Error('Implement me. Unknown stdin file type!');
}
// For supporting legacy API we put the FD here.
stdin.fd = fd;
// stdin starts out life in a paused state, but node doesn't
// know yet. Explicitly to readStop() it to put it in the
// not-reading state.
if (stdin._handle && stdin._handle.readStop) {
stdin._handle.reading = false;
stdin.push('');
stdin._handle.readStop();
}
// if the user calls stdin.pause(), then we need to stop reading
// immediately, so that the process can close down.
stdin.on('pause', function() {
if (!stdin._handle)
return;
stdin.push('');
stdin._handle.reading = false;
stdin._handle.readStop();
});
return stdin;
});
process.openStdin = function() {
process.stdin.resume();
return process.stdin;
};
};
startup.processKillAndExit = function() {
process.exit = function(code) {
if (code || code === 0)
process.exitCode = code;
if (!process._exiting) {
process._exiting = true;
process.emit('exit', process.exitCode || 0);
}
process.reallyExit(process.exitCode || 0);
};
process.kill = function(pid, sig) {
var err;
if (pid != (pid | 0)) {
throw new TypeError('invalid pid');
}
// preserve null signal
if (0 === sig) {
err = process._kill(pid, 0);
} else {
sig = sig || 'SIGTERM';
if (startup.lazyConstants()[sig] &&
sig.slice(0, 3) === 'SIG') {
err = process._kill(pid, startup.lazyConstants()[sig]);
} else {
throw new Error('Unknown signal: ' + sig);
}
}
if (err) {
var errnoException = NativeModule.require('util')._errnoException;
throw errnoException(err, 'kill');
}
return true;
};
};
startup.processSignalHandlers = function() {
// Load events module in order to access prototype elements on process like
// process.addListener.
var signalWraps = {};
function isSignal(event) {
return event.slice(0, 3) === 'SIG' &&
startup.lazyConstants().hasOwnProperty(event);
}
// Detect presence of a listener for the special signal types
process.on('newListener', function(type, listener) {
if (isSignal(type) &&
!signalWraps.hasOwnProperty(type)) {
var Signal = process.binding('signal_wrap').Signal;
var wrap = new Signal();
wrap.unref();
wrap.onsignal = function() { process.emit(type); };
var signum = startup.lazyConstants()[type];
var err = wrap.start(signum);
if (err) {
wrap.close();
var errnoException = NativeModule.require('util')._errnoException;
throw errnoException(err, 'uv_signal_start');
}
signalWraps[type] = wrap;
}
});
process.on('removeListener', function(type, listener) {
if (signalWraps.hasOwnProperty(type) && this.listenerCount(type) === 0) {
signalWraps[type].close();
delete signalWraps[type];
}
});
};
startup.processChannel = function() {
// If we were spawned with env NODE_CHANNEL_FD then load that up and
// start parsing data from that stream.
if (process.env.NODE_CHANNEL_FD) {
var fd = parseInt(process.env.NODE_CHANNEL_FD, 10);
assert(fd >= 0);
// Make sure it's not accidentally inherited by child processes.
delete process.env.NODE_CHANNEL_FD;
var cp = NativeModule.require('child_process');
// Load tcp_wrap to avoid situation where we might immediately receive
// a message.
// FIXME is this really necessary?
process.binding('tcp_wrap');
cp._forkChild(fd);
assert(process.send);
}
};
startup.processRawDebug = function() {
var format = NativeModule.require('util').format;
var rawDebug = process._rawDebug;
process._rawDebug = function() {
rawDebug(format.apply(null, arguments));
};
};
// Load preload modules
startup.preloadModules = function() {
if (process._preload_modules) {
NativeModule.require('module')._preloadModules(process._preload_modules);
}
};
// 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 ContextifyScript = process.binding('contextify').ContextifyScript;
function runInThisContext(code, options) {
var script = new ContextifyScript(code, options);
return script.runInThisContext();
}
function NativeModule(id) {
this.filename = id + '.js';
this.id = id;
this.exports = {};
this.loaded = false;
}
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);
}
process.moduleLoadList.push('NativeModule ' + id);
var nativeModule = new NativeModule(id);
nativeModule.cache();
nativeModule.compile();
return nativeModule.exports;
};
NativeModule.getCached = function(id) {
return NativeModule._cache[id];
};
NativeModule.exists = function(id) {
return NativeModule._source.hasOwnProperty(id);
};
const EXPOSE_INTERNALS = process.execArgv.some(function(arg) {
return arg.match(/^--expose[-_]internals$/);
});
if (EXPOSE_INTERNALS) {
NativeModule.nonInternalExists = NativeModule.exists;
NativeModule.isInternal = function(id) {
return false;
};
} else {
NativeModule.nonInternalExists = function(id) {
return NativeModule.exists(id) && !NativeModule.isInternal(id);
};
NativeModule.isInternal = function(id) {
return id.startsWith('internal/');
};
}
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, { filename: this.filename });
fn(this.exports, NativeModule.require, this, this.filename);
this.loaded = true;
};
NativeModule.prototype.cache = function() {
NativeModule._cache[this.id] = this;
};
startup();
});