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641 lines (547 loc) · 21.4 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) {
let internalBinding;
const exceptionHandlerState = { captureFn: null };
function startup() {
const EventEmitter = NativeModule.require('events');
const origProcProto = Object.getPrototypeOf(process);
Object.setPrototypeOf(origProcProto, EventEmitter.prototype);
EventEmitter.call(process);
setupProcessObject();
internalBinding = process._internalBinding;
delete process._internalBinding;
// do this good and early, since it handles errors.
setupProcessFatal();
setupV8();
setupProcessICUVersions();
setupGlobalVariables();
const _process = NativeModule.require('internal/process');
_process.setupConfig(NativeModule._source);
_process.setupSignalHandlers();
_process.setupUncaughtExceptionCapture(exceptionHandlerState);
NativeModule.require('internal/process/warning').setup();
NativeModule.require('internal/process/next_tick').setup();
NativeModule.require('internal/process/stdio').setup();
const perf = process.binding('performance');
const {
NODE_PERFORMANCE_MILESTONE_BOOTSTRAP_COMPLETE,
NODE_PERFORMANCE_MILESTONE_THIRD_PARTY_MAIN_START,
NODE_PERFORMANCE_MILESTONE_THIRD_PARTY_MAIN_END,
NODE_PERFORMANCE_MILESTONE_CLUSTER_SETUP_START,
NODE_PERFORMANCE_MILESTONE_CLUSTER_SETUP_END,
NODE_PERFORMANCE_MILESTONE_MODULE_LOAD_START,
NODE_PERFORMANCE_MILESTONE_MODULE_LOAD_END,
NODE_PERFORMANCE_MILESTONE_PRELOAD_MODULE_LOAD_START,
NODE_PERFORMANCE_MILESTONE_PRELOAD_MODULE_LOAD_END
} = perf.constants;
_process.setup_hrtime();
_process.setup_performance();
_process.setup_cpuUsage();
_process.setupMemoryUsage();
_process.setupKillAndExit();
if (global.__coverage__)
NativeModule.require('internal/process/write-coverage').setup();
NativeModule.require('internal/trace_events_async_hooks').setup();
NativeModule.require('internal/inspector_async_hook').setup();
// 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')
_process.setupChannel();
_process.setupRawDebug();
const browserGlobals = !process._noBrowserGlobals;
if (browserGlobals) {
setupGlobalTimeouts();
setupGlobalConsole();
}
// Ensure setURLConstructor() is called before the native
// URL::ToObject() method is used.
NativeModule.require('internal/url');
Object.defineProperty(process, 'argv0', {
enumerable: true,
configurable: false,
value: process.argv[0]
});
process.argv[0] = process.execPath;
// Handle `--debug*` deprecation and invalidation
if (process._invalidDebug) {
process.emitWarning(
'`node --debug` and `node --debug-brk` are invalid. ' +
'Please use `node --inspect` or `node --inspect-brk` instead.',
'DeprecationWarning', 'DEP0062', startup, true);
process.exit(9);
} else if (process._deprecatedDebugBrk) {
process.emitWarning(
'`node --inspect --debug-brk` is deprecated. ' +
'Please use `node --inspect-brk` instead.',
'DeprecationWarning', 'DEP0062', startup, true);
}
if (process.binding('config').experimentalModules) {
process.emitWarning(
'The ESM module loader is experimental.',
'ExperimentalWarning', undefined);
}
// 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() {
perf.markMilestone(NODE_PERFORMANCE_MILESTONE_THIRD_PARTY_MAIN_START);
NativeModule.require('_third_party_main');
perf.markMilestone(NODE_PERFORMANCE_MILESTONE_THIRD_PARTY_MAIN_END);
});
} else if (process.argv[1] === 'inspect' || process.argv[1] === 'debug') {
if (process.argv[1] === 'debug') {
process.emitWarning(
'`node debug` is deprecated. Please use `node inspect` instead.',
'DeprecationWarning', 'DEP0068');
}
// Start the debugger agent
process.nextTick(function() {
NativeModule.require('internal/deps/node-inspect/lib/_inspect').start();
});
} else if (process.profProcess) {
NativeModule.require('internal/v8_prof_processor');
} 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) {
perf.markMilestone(NODE_PERFORMANCE_MILESTONE_CLUSTER_SETUP_START);
const cluster = NativeModule.require('cluster');
cluster._setupWorker();
perf.markMilestone(NODE_PERFORMANCE_MILESTONE_CLUSTER_SETUP_END);
// Make sure it's not accidentally inherited by child processes.
delete process.env.NODE_UNIQUE_ID;
}
if (process._eval != null && !process._forceRepl) {
perf.markMilestone(NODE_PERFORMANCE_MILESTONE_MODULE_LOAD_START);
perf.markMilestone(NODE_PERFORMANCE_MILESTONE_MODULE_LOAD_END);
// User passed '-e' or '--eval' arguments to Node without '-i' or
// '--interactive'
perf.markMilestone(
NODE_PERFORMANCE_MILESTONE_PRELOAD_MODULE_LOAD_START);
preloadModules();
perf.markMilestone(NODE_PERFORMANCE_MILESTONE_PRELOAD_MODULE_LOAD_END);
const internalModule = NativeModule.require('internal/module');
internalModule.addBuiltinLibsToObject(global);
evalScript('[eval]');
} else if (process.argv[1] && process.argv[1] !== '-') {
perf.markMilestone(NODE_PERFORMANCE_MILESTONE_MODULE_LOAD_START);
// make process.argv[1] into a full path
const path = NativeModule.require('path');
process.argv[1] = path.resolve(process.argv[1]);
const Module = NativeModule.require('module');
// check if user passed `-c` or `--check` arguments to Node.
if (process._syntax_check_only != null) {
const fs = NativeModule.require('fs');
// read the source
const filename = Module._resolveFilename(process.argv[1]);
var source = fs.readFileSync(filename, 'utf-8');
checkScriptSyntax(source, filename);
process.exit(0);
}
perf.markMilestone(NODE_PERFORMANCE_MILESTONE_MODULE_LOAD_END);
perf.markMilestone(
NODE_PERFORMANCE_MILESTONE_PRELOAD_MODULE_LOAD_START);
preloadModules();
perf.markMilestone(
NODE_PERFORMANCE_MILESTONE_PRELOAD_MODULE_LOAD_END);
Module.runMain();
} else {
perf.markMilestone(NODE_PERFORMANCE_MILESTONE_MODULE_LOAD_START);
perf.markMilestone(NODE_PERFORMANCE_MILESTONE_MODULE_LOAD_END);
perf.markMilestone(
NODE_PERFORMANCE_MILESTONE_PRELOAD_MODULE_LOAD_START);
preloadModules();
perf.markMilestone(
NODE_PERFORMANCE_MILESTONE_PRELOAD_MODULE_LOAD_END);
// If -i or --interactive were passed, or stdin is a TTY.
if (process._forceRepl || NativeModule.require('tty').isatty(0)) {
// REPL
const cliRepl = NativeModule.require('internal/repl');
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();
});
});
if (process._eval != null) {
// User passed '-e' or '--eval'
evalScript('[eval]');
}
} 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() {
if (process._syntax_check_only != null) {
checkScriptSyntax(code, '[stdin]');
} else {
process._eval = code;
evalScript('[stdin]');
}
});
}
}
}
perf.markMilestone(NODE_PERFORMANCE_MILESTONE_BOOTSTRAP_COMPLETE);
}
function setupProcessObject() {
process._setupProcessObject(pushValueToArray);
function pushValueToArray() {
for (var i = 0; i < arguments.length; i++)
this.push(arguments[i]);
}
}
function setupGlobalVariables() {
Object.defineProperty(global, Symbol.toStringTag, {
value: 'global',
writable: false,
enumerable: false,
configurable: true
});
global.process = process;
const util = NativeModule.require('util');
function makeGetter(name) {
return util.deprecate(function() {
return this;
}, `'${name}' is deprecated, use 'global'`, 'DEP0016');
}
function makeSetter(name) {
return util.deprecate(function(value) {
Object.defineProperty(this, name, {
configurable: true,
writable: true,
enumerable: true,
value: value
});
}, `'${name}' is deprecated, use 'global'`, 'DEP0016');
}
Object.defineProperties(global, {
GLOBAL: {
configurable: true,
get: makeGetter('GLOBAL'),
set: makeSetter('GLOBAL')
},
root: {
configurable: true,
get: makeGetter('root'),
set: makeSetter('root')
}
});
// This, as side effect, removes `setupBufferJS` from the buffer binding,
// and exposes it on `internal/buffer`.
NativeModule.require('internal/buffer');
global.Buffer = NativeModule.require('buffer').Buffer;
process.domain = null;
process._exiting = false;
}
function setupGlobalTimeouts() {
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;
}
function setupGlobalConsole() {
const originalConsole = global.console;
const Module = NativeModule.require('module');
// Setup Node.js global.console
const wrappedConsole = NativeModule.require('console');
Object.defineProperty(global, 'console', {
configurable: true,
enumerable: true,
get() {
return wrappedConsole;
}
});
setupInspector(originalConsole, wrappedConsole, Module);
}
function setupInspector(originalConsole, wrappedConsole, Module) {
if (!process.config.variables.v8_enable_inspector) {
return;
}
const { addCommandLineAPI, consoleCall } = process.binding('inspector');
// Setup inspector command line API
const { makeRequireFunction } = NativeModule.require('internal/module');
const path = NativeModule.require('path');
const cwd = tryGetCwd(path);
const consoleAPIModule = new Module('<inspector console>');
consoleAPIModule.paths =
Module._nodeModulePaths(cwd).concat(Module.globalPaths);
addCommandLineAPI('require', makeRequireFunction(consoleAPIModule));
const config = {};
for (const key of Object.keys(wrappedConsole)) {
if (!originalConsole.hasOwnProperty(key))
continue;
// If global console has the same method as inspector console,
// then wrap these two methods into one. Native wrapper will preserve
// the original stack.
wrappedConsole[key] = consoleCall.bind(wrappedConsole,
originalConsole[key],
wrappedConsole[key],
config);
}
for (const key of Object.keys(originalConsole)) {
if (wrappedConsole.hasOwnProperty(key))
continue;
wrappedConsole[key] = originalConsole[key];
}
}
function noop() {}
function setupProcessFatal() {
const async_wrap = process.binding('async_wrap');
// Arrays containing hook flags and ids for async_hook calls.
const { async_hook_fields, async_id_fields } = async_wrap;
// Internal functions needed to manipulate the stack.
const { clearAsyncIdStack } = async_wrap;
const { kAfter, kExecutionAsyncId,
kDefaultTriggerAsyncId, kStackLength } = async_wrap.constants;
process._fatalException = function(er) {
// It's possible that kDefaultTriggerAsyncId was set for a constructor
// call that threw and was never cleared. So clear it now.
async_id_fields[kDefaultTriggerAsyncId] = -1;
if (exceptionHandlerState.captureFn !== null) {
exceptionHandlerState.captureFn(er);
} else if (!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
try {
if (!process._exiting) {
process._exiting = true;
process.emit('exit', 1);
}
} catch (er) {
// nothing to be done about it at this point.
}
return false;
}
// If we handled an error, then make sure any ticks get processed
// by ensuring that the next Immediate cycle isn't empty
NativeModule.require('timers').setImmediate(noop);
// Emit the after() hooks now that the exception has been handled.
if (async_hook_fields[kAfter] > 0) {
const { emitAfter } = NativeModule.require('internal/async_hooks');
do {
emitAfter(async_id_fields[kExecutionAsyncId]);
} while (async_hook_fields[kStackLength] > 0);
// Or completely empty the id stack.
} else {
clearAsyncIdStack();
}
return true;
};
}
function setupV8() {
// Warm up the map and set iterator preview functions. V8 compiles
// functions lazily (unless --nolazy is set) so we need to do this
// before we turn off --allow_natives_syntax again.
const v8 = NativeModule.require('internal/v8');
v8.previewMapIterator(new Map().entries(), 1);
v8.previewSetIterator(new Set().entries(), 1);
// Disable --allow_natives_syntax again unless it was explicitly
// specified on the command line.
const re = /^--allow[-_]natives[-_]syntax$/;
if (!process.execArgv.some((s) => re.test(s)))
process.binding('v8').setFlagsFromString('--noallow_natives_syntax');
}
function setupProcessICUVersions() {
const icu = process.binding('config').hasIntl ?
process.binding('icu') : undefined;
if (!icu) return; // no Intl/ICU: nothing to add here.
// With no argument, getVersion() returns a comma separated list
// of possible types.
const versionTypes = icu.getVersion().split(',');
for (var n = 0; n < versionTypes.length; n++) {
var name = versionTypes[n];
const version = icu.getVersion(name);
Object.defineProperty(process.versions, name, {
writable: false,
enumerable: true,
value: version
});
}
}
function tryGetCwd(path) {
try {
return process.cwd();
} catch (ex) {
// getcwd(3) can fail if the current working directory has been deleted.
// Fall back to the directory name of the (absolute) executable path.
// It's not really correct but what are the alternatives?
return path.dirname(process.execPath);
}
}
function wrapForBreakOnFirstLine(source) {
if (!process._breakFirstLine)
return source;
const fn = `function() {\n\n${source};\n\n}`;
return `process.binding('inspector').callAndPauseOnStart(${fn}, {})`;
}
function evalScript(name) {
const Module = NativeModule.require('module');
const path = NativeModule.require('path');
const cwd = tryGetCwd(path);
const module = new Module(name);
module.filename = path.join(cwd, name);
module.paths = Module._nodeModulePaths(cwd);
const body = wrapForBreakOnFirstLine(process._eval);
const 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: ` +
`${JSON.stringify(name)}, displayErrors: true });\n`;
const result = module._compile(script, `${name}-wrapper`);
if (process._print_eval) console.log(result);
// Handle any nextTicks added in the first tick of the program.
process._tickCallback();
}
// Load preload modules
function preloadModules() {
if (process._preload_modules) {
NativeModule.require('module')._preloadModules(process._preload_modules);
}
}
function checkScriptSyntax(source, filename) {
const Module = NativeModule.require('module');
const vm = NativeModule.require('vm');
const internalModule = NativeModule.require('internal/module');
// remove Shebang
source = internalModule.stripShebang(source);
// remove BOM
source = internalModule.stripBOM(source);
// wrap it
source = Module.wrap(source);
// compile the script, this will throw if it fails
new vm.Script(source, { displayErrors: true, filename });
}
// 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.
const ContextifyScript = process.binding('contextify').ContextifyScript;
function runInThisContext(code, options) {
const script = new ContextifyScript(code, options);
return script.runInThisContext();
}
function NativeModule(id) {
this.filename = `${id}.js`;
this.id = id;
this.exports = {};
this.loaded = false;
this.loading = false;
}
NativeModule._source = process.binding('natives');
NativeModule._cache = {};
const config = process.binding('config');
NativeModule.require = function(id) {
if (id === 'native_module') {
return NativeModule;
}
const cached = NativeModule.getCached(id);
if (cached && (cached.loaded || cached.loading)) {
return cached.exports;
}
if (!NativeModule.exists(id)) {
// Model the error off the internal/errors.js model, but
// do not use that module given that it could actually be
// the one causing the error if there's a bug in Node.js
const err = new Error(`No such built-in module: ${id}`);
err.code = 'ERR_UNKNOWN_BUILTIN_MODULE';
err.name = 'Error [ERR_UNKNOWN_BUILTIN_MODULE]';
throw err;
}
process.moduleLoadList.push(`NativeModule ${id}`);
const nativeModule = new NativeModule(id);
nativeModule.cache();
nativeModule.compile();
return nativeModule.exports;
};
NativeModule.requireForDeps = function(id) {
if (!NativeModule.exists(id) ||
// TODO(TimothyGu): remove when DEP0084 reaches end of life.
id.startsWith('node-inspect/') ||
id.startsWith('v8/')) {
id = `internal/deps/${id}`;
}
return NativeModule.require(id);
};
NativeModule.getCached = function(id) {
return NativeModule._cache[id];
};
NativeModule.exists = function(id) {
return NativeModule._source.hasOwnProperty(id);
};
if (config.exposeInternals) {
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, internalBinding, process) {',
'\n});'
];
NativeModule.prototype.compile = function() {
var source = NativeModule.getSource(this.id);
source = NativeModule.wrap(source);
this.loading = true;
try {
const fn = runInThisContext(source, {
filename: this.filename,
lineOffset: 0,
displayErrors: true
});
const requireFn = this.id.startsWith('internal/deps/') ?
NativeModule.requireForDeps :
NativeModule.require;
fn(this.exports, requireFn, this, internalBinding, process);
this.loaded = true;
} finally {
this.loading = false;
}
};
NativeModule.prototype.cache = function() {
NativeModule._cache[this.id] = this;
};
startup();
});