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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_WRAPPER_TYPE_INFO_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_WRAPPER_TYPE_INFO_H_
#include "gin/public/wrapper_info.h"
#include "third_party/blink/renderer/platform/bindings/active_script_wrappable_base.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/assertions.h"
#include "v8/include/v8.h"
namespace blink {
class DOMWrapperWorld;
class ScriptWrappable;
ScriptWrappable* ToScriptWrappable(
const v8::PersistentBase<v8::Object>& wrapper);
ScriptWrappable* ToScriptWrappable(v8::Local<v8::Object> wrapper);
static const int kV8DOMWrapperTypeIndex =
static_cast<int>(gin::kWrapperInfoIndex);
static const int kV8DOMWrapperObjectIndex =
static_cast<int>(gin::kEncodedValueIndex);
static const int kV8DefaultWrapperInternalFieldCount =
static_cast<int>(gin::kNumberOfInternalFields);
static const int kV8PrototypeTypeIndex = 0;
static const int kV8PrototypeInternalFieldcount = 1;
typedef v8::Local<v8::FunctionTemplate> (
*DomTemplateFunction)(v8::Isolate*, const DOMWrapperWorld&);
typedef ActiveScriptWrappableBase* (*ToActiveScriptWrappableFunction)(
v8::Local<v8::Object>);
typedef void (*ResolveWrapperReachabilityFunction)(
v8::Isolate*,
ScriptWrappable*,
const v8::Persistent<v8::Object>&);
typedef void (*InstallConditionalFeaturesFunction)(
v8::Local<v8::Context>,
const DOMWrapperWorld&,
v8::Local<v8::Object>,
v8::Local<v8::Object>,
v8::Local<v8::Function>,
v8::Local<v8::FunctionTemplate>);
// This struct provides a way to store a bunch of information that is helpful
// when unwrapping v8 objects. Each v8 bindings class has exactly one static
// WrapperTypeInfo member, so comparing pointers is a safe way to determine if
// types match.
struct WrapperTypeInfo {
DISALLOW_NEW();
enum WrapperTypePrototype {
kWrapperTypeObjectPrototype,
kWrapperTypeNoPrototype, // For legacy callback interface
};
enum WrapperClassId {
kNodeClassId = 1, // NodeClassId must be smaller than ObjectClassId.
kObjectClassId,
};
enum ActiveScriptWrappableInheritance {
kNotInheritFromActiveScriptWrappable,
kInheritFromActiveScriptWrappable,
};
static const WrapperTypeInfo* Unwrap(v8::Local<v8::Value> type_info_wrapper) {
return reinterpret_cast<const WrapperTypeInfo*>(
v8::External::Cast(*type_info_wrapper)->Value());
}
static void WrapperCreated() {
ThreadState::Current()->Heap().HeapStats().IncreaseWrapperCount(1);
}
static void WrapperDestroyed() {
ThreadHeapStats& heap_stats = ThreadState::Current()->Heap().HeapStats();
heap_stats.DecreaseWrapperCount(1);
heap_stats.IncreaseCollectedWrapperCount(1);
}
bool Equals(const WrapperTypeInfo* that) const { return this == that; }
bool IsSubclass(const WrapperTypeInfo* that) const {
for (const WrapperTypeInfo* current = this; current;
current = current->parent_class) {
if (current == that)
return true;
}
return false;
}
void ConfigureWrapper(v8::PersistentBase<v8::Object>* wrapper) const {
wrapper->SetWrapperClassId(wrapper_class_id);
}
v8::Local<v8::FunctionTemplate> domTemplate(
v8::Isolate* isolate,
const DOMWrapperWorld& world) const {
return dom_template_function(isolate, world);
}
void InstallConditionalFeatures(
v8::Local<v8::Context> context,
const DOMWrapperWorld& world,
v8::Local<v8::Object> instance_object,
v8::Local<v8::Object> prototype_object,
v8::Local<v8::Function> interface_object,
v8::Local<v8::FunctionTemplate> interface_template) const {
if (install_conditional_features_function) {
install_conditional_features_function(context, world, instance_object,
prototype_object, interface_object,
interface_template);
}
}
bool IsActiveScriptWrappable() const {
return active_script_wrappable_inheritance ==
kInheritFromActiveScriptWrappable;
}
// This field must be the first member of the struct WrapperTypeInfo.
// See also static_assert() in .cpp file.
const gin::GinEmbedder gin_embedder;
DomTemplateFunction dom_template_function;
InstallConditionalFeaturesFunction install_conditional_features_function;
const char* const interface_name;
const WrapperTypeInfo* parent_class;
const unsigned wrapper_type_prototype : 2; // WrapperTypePrototype
const unsigned wrapper_class_id : 2; // WrapperClassId
const unsigned // ActiveScriptWrappableInheritance
active_script_wrappable_inheritance : 1;
};
template <typename T, int offset>
inline T* GetInternalField(const v8::PersistentBase<v8::Object>& persistent) {
DCHECK_LT(offset, v8::Object::InternalFieldCount(persistent));
return reinterpret_cast<T*>(
v8::Object::GetAlignedPointerFromInternalField(persistent, offset));
}
template <typename T, int offset>
inline T* GetInternalField(v8::Local<v8::Object> wrapper) {
DCHECK_LT(offset, wrapper->InternalFieldCount());
return reinterpret_cast<T*>(
wrapper->GetAlignedPointerFromInternalField(offset));
}
// The return value can be null if |wrapper| is a global proxy, which points to
// nothing while a navigation.
inline ScriptWrappable* ToScriptWrappable(
const v8::PersistentBase<v8::Object>& wrapper) {
return GetInternalField<ScriptWrappable, kV8DOMWrapperObjectIndex>(wrapper);
}
inline ScriptWrappable* ToScriptWrappable(v8::Local<v8::Object> wrapper) {
return GetInternalField<ScriptWrappable, kV8DOMWrapperObjectIndex>(wrapper);
}
inline const WrapperTypeInfo* ToWrapperTypeInfo(
const v8::PersistentBase<v8::Object>& wrapper) {
return GetInternalField<WrapperTypeInfo, kV8DOMWrapperTypeIndex>(wrapper);
}
inline const WrapperTypeInfo* ToWrapperTypeInfo(v8::Local<v8::Object> wrapper) {
return GetInternalField<WrapperTypeInfo, kV8DOMWrapperTypeIndex>(wrapper);
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_WRAPPER_TYPE_INFO_H_
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