nodejs c++啟動過程3

Persistent v8::Context::New(
v8::ExtensionConfiguration* extensions,
v8::Handle global_template,
v8::Handle global_object) {
i::Isolate::EnsureDefaultIsolate();
i::Isolate* isolate = i::Isolate::Current();
EnsureInitializedForIsolate(isolate, “v8::Context::New()”);
LOG_API(isolate, “Context::New”);
ON_BAILOUT(isolate, “v8::Context::New()”, return Persistent());

// 下面的內容,上接博客1
// Enter V8 via an ENTER_V8 scope.
i::Handle env;

{

// 這個是進入引擎,使用VMState類,在析構的時候,離開引擎

ENTER_V8(isolate);
v8::Handle proxy_template = global_template;
i::Handle proxy_constructor;
i::Handle global_constructor;

if (!global_template.IsEmpty()) {
// Make sure that the global_template has a constructor.
global_constructor =
EnsureConstructor(Utils::OpenHandle(*global_template));

// Create a fresh template for the global proxy object.
proxy_template = ObjectTemplate::New();
proxy_constructor =
EnsureConstructor(Utils::OpenHandle(*proxy_template));

// Set the global template to be the prototype template of
// global proxy template.
proxy_constructor->set_prototype_template(
*Utils::OpenHandle(*global_template));

// Migrate security handlers from global_template to
// proxy_template. Temporarily removing access check
// information from the global template.
if (!global_constructor->access_check_info()->IsUndefined()) {
proxy_constructor->set_access_check_info(
global_constructor->access_check_info());
proxy_constructor->set_needs_access_check(
global_constructor->needs_access_check());
global_constructor->set_needs_access_check(false);
global_constructor->set_access_check_info(
isolate->heap()->undefined_value());
}
}

// Create the environment.
env = isolate->bootstrapper()->CreateEnvironment(
isolate,
Utils::OpenHandle(*global_object, true),
proxy_template,
extensions);

// Restore the access check info on the global template.
if (!global_template.IsEmpty()) {
ASSERT(!global_constructor.is_null());
ASSERT(!proxy_constructor.is_null());
global_constructor->set_access_check_info(
proxy_constructor->access_check_info());
global_constructor->set_needs_access_check(
proxy_constructor->needs_access_check());
}
isolate->runtime_profiler()->Reset();
}
// Leave V8.

if (env.is_null()) {
return Persistent();
}
return Persistent(Utils::ToLocal(env));
}

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