98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE.chromium file.
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#include "shell/common/gin_helper/wrappable.h"
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#include "base/logging.h"
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#include "base/threading/thread_task_runner_handle.h"
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#include "shell/common/gin_helper/dictionary.h"
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namespace gin_helper {
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WrappableBase::WrappableBase() = default;
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WrappableBase::~WrappableBase() {
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if (wrapper_.IsEmpty())
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return;
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GetWrapper()->SetAlignedPointerInInternalField(0, nullptr);
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wrapper_.ClearWeak();
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wrapper_.Reset();
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}
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v8::Local<v8::Object> WrappableBase::GetWrapper() const {
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if (!wrapper_.IsEmpty())
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return v8::Local<v8::Object>::New(isolate_, wrapper_);
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else
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return v8::Local<v8::Object>();
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}
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v8::MaybeLocal<v8::Object> WrappableBase::GetWrapper(
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v8::Isolate* isolate) const {
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if (!wrapper_.IsEmpty())
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return v8::MaybeLocal<v8::Object>(
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v8::Local<v8::Object>::New(isolate, wrapper_));
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else
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return v8::MaybeLocal<v8::Object>();
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}
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void WrappableBase::InitWithArgs(gin::Arguments* args) {
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v8::Local<v8::Object> holder;
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args->GetHolder(&holder);
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InitWith(args->isolate(), holder);
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}
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void WrappableBase::InitWith(v8::Isolate* isolate,
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v8::Local<v8::Object> wrapper) {
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CHECK(wrapper_.IsEmpty());
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isolate_ = isolate;
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wrapper->SetAlignedPointerInInternalField(0, this);
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wrapper_.Reset(isolate, wrapper);
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wrapper_.SetWeak(this, FirstWeakCallback, v8::WeakCallbackType::kParameter);
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// Call object._init if we have one.
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v8::Local<v8::Function> init;
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if (Dictionary(isolate, wrapper).Get("_init", &init))
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init->Call(isolate->GetCurrentContext(), wrapper, 0, nullptr).IsEmpty();
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AfterInit(isolate);
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}
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// static
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void WrappableBase::FirstWeakCallback(
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const v8::WeakCallbackInfo<WrappableBase>& data) {
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WrappableBase* wrappable = data.GetParameter();
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wrappable->wrapper_.Reset();
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data.SetSecondPassCallback(SecondWeakCallback);
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}
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// static
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void WrappableBase::SecondWeakCallback(
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const v8::WeakCallbackInfo<WrappableBase>& data) {
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// Certain classes (for example api::WebContents and api::WebContentsView)
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// are running JS code in the destructor, while V8 may crash when JS code
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// runs inside weak callback.
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//
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// We work around this problem by delaying the deletion to next tick where
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// garbage collection is done.
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base::ThreadTaskRunnerHandle::Get()->PostNonNestableTask(
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FROM_HERE,
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base::BindOnce([](WrappableBase* wrappable) { delete wrappable; },
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base::Unretained(data.GetParameter())));
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}
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namespace internal {
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void* FromV8Impl(v8::Isolate* isolate, v8::Local<v8::Value> val) {
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if (!val->IsObject())
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return nullptr;
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v8::Local<v8::Object> obj = v8::Local<v8::Object>::Cast(val);
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if (obj->InternalFieldCount() != 1)
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return nullptr;
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return obj->GetAlignedPointerFromInternalField(0);
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}
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} // namespace internal
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} // namespace gin_helper
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