electron/native_mate/wrappable.cc
2015-12-03 15:38:14 +08:00

94 lines
2.6 KiB
C++

// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE.chromium file.
#include "native_mate/wrappable.h"
#include "base/logging.h"
#include "native_mate/dictionary.h"
#include "native_mate/object_template_builder.h"
namespace mate {
Wrappable::Wrappable() : isolate_(NULL) {
}
Wrappable::~Wrappable() {
wrapper_.Reset();
}
void Wrappable::Wrap(v8::Isolate* isolate, v8::Local<v8::Object> wrapper) {
if (!wrapper_.IsEmpty())
return;
isolate_ = isolate;
wrapper->SetAlignedPointerInInternalField(0, this);
wrapper_.Reset(isolate, wrapper);
wrapper_.SetWeak(this, FirstWeakCallback, v8::WeakCallbackType::kParameter);
// Call object._init if we have one.
v8::Local<v8::Function> init;
if (Dictionary(isolate, wrapper).Get("_init", &init))
init->Call(wrapper, 0, nullptr);
AfterInit(isolate);
}
// static
void Wrappable::BuildPrototype(v8::Isolate* isolate,
v8::Local<v8::ObjectTemplate> prototype) {
}
ObjectTemplateBuilder Wrappable::GetObjectTemplateBuilder(
v8::Isolate* isolate) {
return ObjectTemplateBuilder(isolate);
}
void Wrappable::FirstWeakCallback(const v8::WeakCallbackInfo<Wrappable>& data) {
Wrappable* wrappable = data.GetParameter();
wrappable->wrapper_.Reset();
data.SetSecondPassCallback(SecondWeakCallback);
}
void Wrappable::SecondWeakCallback(
const v8::WeakCallbackInfo<Wrappable>& data) {
Wrappable* wrappable = data.GetParameter();
delete wrappable;
}
v8::Local<v8::Object> Wrappable::GetWrapper(v8::Isolate* isolate) {
if (!wrapper_.IsEmpty())
return MATE_PERSISTENT_TO_LOCAL(v8::Object, isolate, wrapper_);
v8::Local<v8::ObjectTemplate> templ =
GetObjectTemplateBuilder(isolate).Build();
CHECK(!templ.IsEmpty());
CHECK_EQ(1, templ->InternalFieldCount());
v8::Local<v8::Object> wrapper;
// |wrapper| may be empty in some extreme cases, e.g., when
// Object.prototype.constructor is overwritten.
if (!templ->NewInstance(isolate->GetCurrentContext()).ToLocal(&wrapper)) {
// The current wrappable object will be no longer managed by V8. Delete this
// now.
delete this;
return wrapper;
}
Wrap(isolate, wrapper);
return wrapper;
}
namespace internal {
void* FromV8Impl(v8::Isolate* isolate, v8::Local<v8::Value> val) {
if (!val->IsObject())
return NULL;
v8::Local<v8::Object> obj = v8::Local<v8::Object>::Cast(val);
if (obj->InternalFieldCount() != 1)
return NULL;
return MATE_GET_INTERNAL_FIELD_POINTER(obj, 0);
}
} // namespace internal
} // namespace mate