node/src/handle_wrap.cc at fe15dae8e62e11c3420aa794ba4bf48eee0ffc6a · nodejs/node · GitHub

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// Copyright Joyent, Inc. and other Node contributors.

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

#include "handle_wrap.h"

#include "async_wrap-inl.h"

#include "env-inl.h"

#include "node_external_reference.h"

#include "util-inl.h"

namespace node {

using v8::Context;

using v8::FunctionCallbackInfo;

using v8::FunctionTemplate;

using v8::HandleScope;

using v8::Isolate;

using v8::Local;

using v8::Object;

using v8::Value;

void HandleWrap::Ref(const FunctionCallbackInfo<Value>& args) {

HandleWrap* wrap;

ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());

if (IsAlive(wrap))

uv_ref(wrap->GetHandle());

}

void HandleWrap::Unref(const FunctionCallbackInfo<Value>& args) {

HandleWrap* wrap;

ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());

if (IsAlive(wrap))

uv_unref(wrap->GetHandle());

}

void HandleWrap::HasRef(const FunctionCallbackInfo<Value>& args) {

HandleWrap* wrap;

ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());

args.GetReturnValue().Set(HasRef(wrap));

}

void HandleWrap::Close(const FunctionCallbackInfo<Value>& args) {

HandleWrap* wrap;

ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());

wrap->Close(args[0]);

}

void HandleWrap::Close(Local<Value> close_callback) {

if (state_ != kInitialized)

return;

uv_close(handle_, OnClose);

state_ = kClosing;

if (!close_callback.IsEmpty() && close_callback->IsFunction() &&

!persistent().IsEmpty()) {

object()->Set(env()->context(),

env()->handle_onclose_symbol(),

close_callback).Check();

}

void HandleWrap::OnGCCollect() {

// When all references to a HandleWrap are lost and the object is supposed to

// be destroyed, we first call Close() to clean up the underlying libuv

// handle. The OnClose callback then acquires and destroys another reference

// to that object, and when that reference is lost, we perform the default

// action (i.e. destroying `this`).

if (state_ != kClosed) {

Close();

} else {

BaseObject::OnGCCollect();

}

bool HandleWrap::IsNotIndicativeOfMemoryLeakAtExit() const {

return IsWeakOrDetached() ||

!HandleWrap::HasRef(this) ||

!uv_is_active(GetHandle());

}

void HandleWrap::MarkAsInitialized() {

env()->handle_wrap_queue()->PushBack(this);

state_ = kInitialized;

}

void HandleWrap::MarkAsUninitialized() {

handle_wrap_queue_.Remove();

state_ = kClosed;

}

HandleWrap::HandleWrap(Environment* env,

Local<Object> object,

uv_handle_t* handle,

AsyncWrap::ProviderType provider)

: AsyncWrap(env, object, provider),

state_(kInitialized),

handle_(handle) {

handle_->data = this;

HandleScope scope(env->isolate());

CHECK(env->has_run_bootstrapping_code());

env->handle_wrap_queue()->PushBack(this);

}

void HandleWrap::OnClose(uv_handle_t* handle) {

CHECK_NOT_NULL(handle->data);

BaseObjectPtr<HandleWrap> wrap { static_cast<HandleWrap*>(handle->data) };

wrap->Detach();

Environment* env = wrap->env();

HandleScope scope(env->isolate());

Context::Scope context_scope(env->context());

CHECK_EQ(wrap->state_, kClosing);

wrap->state_ = kClosed;

wrap->OnClose();

wrap->handle_wrap_queue_.Remove();

if (!wrap->persistent().IsEmpty() &&

wrap->object()->Has(env->context(), env->handle_onclose_symbol())

.FromMaybe(false)) {

wrap->MakeCallback(env->handle_onclose_symbol(), 0, nullptr);

}

Local<FunctionTemplate> HandleWrap::GetConstructorTemplate(Environment* env) {

Local<FunctionTemplate> tmpl = env->handle_wrap_ctor_template();

if (tmpl.IsEmpty()) {

Isolate* isolate = env->isolate();

tmpl = NewFunctionTemplate(isolate, nullptr);

tmpl->SetClassName(FIXED_ONE_BYTE_STRING(env->isolate(), "HandleWrap"));

tmpl->Inherit(AsyncWrap::GetConstructorTemplate(env));

SetProtoMethod(isolate, tmpl, "close", HandleWrap::Close);

SetProtoMethodNoSideEffect(isolate, tmpl, "hasRef", HandleWrap::HasRef);

SetProtoMethod(isolate, tmpl, "ref", HandleWrap::Ref);

SetProtoMethod(isolate, tmpl, "unref", HandleWrap::Unref);

env->set_handle_wrap_ctor_template(tmpl);

}

return tmpl;

}

void HandleWrap::RegisterExternalReferences(

ExternalReferenceRegistry* registry) {

registry->Register(HandleWrap::Close);

registry->Register(HandleWrap::HasRef);

registry->Register(HandleWrap::Ref);

registry->Register(HandleWrap::Unref);

}

} // namespace node

NODE_BINDING_EXTERNAL_REFERENCE(handle_wrap,

node::HandleWrap::RegisterExternalReferences)

node/src/handle_wrap.cc at fe15dae8e62e11c3420aa794ba4bf48eee0ffc6a · nodejs/node · GitHub

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