编译nodejs及其源码研究

int Start(int argc, char** argv) { const char* replaceInvalid = getenv("NODE_INVALID_UTF8"); if (replaceInvalid == NULL) WRITE_UTF8_FLAGS |= String::REPLACE_INVALID_UTF8; #if !defined(_WIN32) // Try hard not to lose SIGUSR1 signals during the bootstrap process. InstallEarlyDebugSignalHandler(); #endif assert(argc > 0); // Hack around with the argv pointer. Used for process.title = "blah". argv = uv_setup_args(argc, argv); // This needs to run *before* V8::Initialize(). The const_cast is not // optional, in case you're wondering. int exec_argc; const char** exec_argv; Init(&argc, const_cast<const char**>(argv), &exec_argc, &exec_argv); #if HAVE_OPENSSL // V8 on Windows doesn't have a good source of entropy. Seed it from // OpenSSL's pool. V8::SetEntropySource(crypto::EntropySource); #endif int code; V8::Initialize(); { Locker locker(node_isolate); Isolate::Scope isolate_scope(node_isolate); HandleScope handle_scope(node_isolate); Local<Context> context = Context::New(node_isolate); Environment* env = CreateEnvironment( node_isolate, context, argc, argv, exec_argc, exec_argv); // Assign env to the debugger's context if (debugger_running) { HandleScope scope(env->isolate()); env->AssignToContext(v8::Debug::GetDebugContext()); } // This Context::Scope is here so EnableDebug() can look up the current // environment with Environment::GetCurrent(). // TODO(bnoordhuis) Reorder the debugger initialization logic so it can // be removed. { Context::Scope context_scope(env->context()); bool more; do { more = uv_run(env->event_loop(), UV_RUN_ONCE); if (more == false) { EmitBeforeExit(env); // Emit `beforeExit` if the loop became alive either after emitting // event, or after running some callbacks. more = uv_loop_alive(env->event_loop()); if (uv_run(env->event_loop(), UV_RUN_NOWAIT) != 0) more = true; } } while (more == true); code = EmitExit(env); RunAtExit(env); } env->Dispose(); env = NULL; } CHECK_NE(node_isolate, NULL); node_isolate->Dispose(); node_isolate = NULL; V8::Dispose(); delete[] exec_argv; exec_argv = NULL; return code; }

Environment* CreateEnvironment(Isolate* isolate, Handle<Context> context, int argc, const char* const* argv, int exec_argc, const char* const* exec_argv) { HandleScope handle_scope(isolate); Context::Scope context_scope(context); Environment* env = Environment::New(context); uv_check_init(env->event_loop(), env->immediate_check_handle()); uv_unref( reinterpret_cast<uv_handle_t*>(env->immediate_check_handle())); uv_idle_init(env->event_loop(), env->immediate_idle_handle()); // Inform V8's CPU profiler when we're idle. The profiler is sampling-based // but not all samples are created equal; mark the wall clock time spent in // epoll_wait() and friends so profiling tools can filter it out. The samples // still end up in v8.log but with state=IDLE rather than state=EXTERNAL. // TODO(bnoordhuis) Depends on a libuv implementation detail that we should // probably fortify in the API contract, namely that the last started prepare // or check watcher runs first. It's not 100% foolproof; if an add-on starts // a prepare or check watcher after us, any samples attributed to its callback // will be recorded with state=IDLE. uv_prepare_init(env->event_loop(), env->idle_prepare_handle()); uv_check_init(env->event_loop(), env->idle_check_handle()); uv_unref(reinterpret_cast<uv_handle_t*>(env->idle_prepare_handle())); uv_unref(reinterpret_cast<uv_handle_t*>(env->idle_check_handle())); if (v8_is_profiling) { StartProfilerIdleNotifier(env); } Local<FunctionTemplate> process_template = FunctionTemplate::New(isolate); process_template->SetClassName(FIXED_ONE_BYTE_STRING(isolate, "process")); Local<Object> process_object = process_template->GetFunction()->NewInstance(); env->set_process_object(process_object); SetupProcessObject(env, argc, argv, exec_argc, exec_argv); Load(env); return env; }

void SetupProcessObject(Environment* env, int argc, const char* const* argv, int exec_argc, const char* const* exec_argv) { HandleScope scope(env->isolate()); Local<Object> process = env->process_object(); process->SetAccessor(env->title_string(), ProcessTitleGetter, ProcessTitleSetter); // process.version READONLY_PROPERTY(process, "version", FIXED_ONE_BYTE_STRING(env->isolate(), NODE_VERSION)); // process.moduleLoadList READONLY_PROPERTY(process, "moduleLoadList", env->module_load_list_array()); // process.versions Local<Object> versions = Object::New(env->isolate()); READONLY_PROPERTY(process, "versions", versions); const char http_parser_version[] = NODE_STRINGIFY(HTTP_PARSER_VERSION_MAJOR) "." NODE_STRINGIFY(HTTP_PARSER_VERSION_MINOR); READONLY_PROPERTY(versions, "http_parser", FIXED_ONE_BYTE_STRING(env->isolate(), http_parser_version)); // +1 to get rid of the leading 'v' READONLY_PROPERTY(versions, "node", OneByteString(env->isolate(), NODE_VERSION + 1)); READONLY_PROPERTY(versions, "v8", OneByteString(env->isolate(), V8::GetVersion())); READONLY_PROPERTY(versions, "uv", OneByteString(env->isolate(), uv_version_string())); READONLY_PROPERTY(versions, "zlib", FIXED_ONE_BYTE_STRING(env->isolate(), ZLIB_VERSION)); const char node_modules_version[] = NODE_STRINGIFY(NODE_MODULE_VERSION); READONLY_PROPERTY( versions, "modules", FIXED_ONE_BYTE_STRING(env->isolate(), node_modules_version));

void Load(Environment* env) { HandleScope handle_scope(env->isolate()); // Compile, execute the src/node.js file. (Which was included as static C // string in node_natives.h. 'natve_node' is the string containing that // source code.) // The node.js file returns a function 'f' atexit(AtExit); TryCatch try_catch; // Disable verbose mode to stop FatalException() handler from trying // to handle the exception. Errors this early in the start-up phase // are not safe to ignore. try_catch.SetVerbose(false); Local<String> script_name = FIXED_ONE_BYTE_STRING(env->isolate(), "node.js"); Local<Value> f_value = ExecuteString(env, MainSource(env), script_name); if (try_catch.HasCaught()) { ReportException(env, try_catch); exit(10); } assert(f_value->IsFunction()); Local<Function> f = Local<Function>::Cast(f_value); // Now we call 'f' with the 'process' variable that we've built up with // all our bindings. Inside node.js we'll take care of assigning things to // their places. // We start the process this way in order to be more modular. Developers // who do not like how 'src/node.js' setups the module system but do like // Node's I/O bindings may want to replace 'f' with their own function. // Add a reference to the global object Local<Object> global = env->context()->Global();