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/*
* Copyright (C) 2009 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_V8_DOM_WRAPPER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_DOM_WRAPPER_H_
#include "base/check_op.h"
#include "base/compiler_specific.h"
#include "third_party/blink/renderer/platform/bindings/binding_security_for_platform.h"
#include "third_party/blink/renderer/platform/bindings/dom_data_store.h"
#include "third_party/blink/renderer/platform/bindings/runtime_call_stats.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/blink/renderer/platform/bindings/v8_binding.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
#include "v8/include/v8.h"
namespace blink {
struct WrapperTypeInfo;
// Contains utility methods to create wrappers, associate ScriptWrappable
// objects with wrappers and set fields in wrappers.
class V8DOMWrapper {
STATIC_ONLY(V8DOMWrapper);
public:
PLATFORM_EXPORT static v8::Local<v8::Object> CreateWrapper(
ScriptState*,
const WrapperTypeInfo*);
PLATFORM_EXPORT static bool IsWrapper(v8::Isolate*, v8::Local<v8::Object>);
// Associates the given ScriptWrappable with the given |wrapper| if the
// ScriptWrappable is not yet associated with any wrapper. Returns the
// wrapper already associated or |wrapper| if not yet associated.
// The caller should always use the returned value rather than |wrapper|.
[[nodiscard]] PLATFORM_EXPORT static v8::Local<v8::Object>
AssociateObjectWithWrapper(v8::Isolate*,
ScriptWrappable*,
const WrapperTypeInfo*,
v8::Local<v8::Object> wrapper);
static void SetNativeInfo(v8::Isolate* isolate,
v8::Local<v8::Object> wrapper,
ScriptWrappable* script_wrappable);
static void ClearNativeInfo(v8::Isolate*,
v8::Local<v8::Object>,
const WrapperTypeInfo*);
// Same as above but for v8::Context::Global(). It sets native info
// on JSGlobalProxy and its hidden prototype.
static void SetNativeInfoForGlobal(v8::Isolate* isolate,
v8::Local<v8::Object> wrapper,
ScriptWrappable* script_wrappable);
// Same as above but for v8::Context::Global(). It clears native info
// on JSGlobalProxy and its hidden prototype.
static void ClearNativeInfoForGlobal(v8::Isolate*,
v8::Local<v8::Object>,
const WrapperTypeInfo*);
// Checks that native info set on JSGlobalProxy and its hidden prototype
// are the same.
static bool CheckNativeInfoForGlobal(v8::Isolate*,
v8::Local<v8::Object>,
const WrapperTypeInfo*);
// HasInternalFieldsSet only checks if the value has the internal fields for
// wrapper object and type, and does not check if it's valid or not. The value
// may not be a Blink's wrapper object. In order to make sure of it, use
// IsWrapper() instead.
PLATFORM_EXPORT static bool HasInternalFieldsSet(v8::Isolate*,
v8::Local<v8::Object>);
};
inline void V8DOMWrapper::SetNativeInfo(
v8::Isolate* isolate,
v8::Local<v8::Object> wrapper,
ScriptWrappable* wrappable) {
DCHECK(wrappable);
DCHECK(!WrapperTypeInfo::HasLegacyInternalFieldsSet(wrapper));
v8::Object::Wrap(isolate, wrapper, wrappable,
ToWrapperTypeInfo(wrappable)->this_tag);
}
inline void V8DOMWrapper::ClearNativeInfo(
v8::Isolate* isolate,
v8::Local<v8::Object> wrapper,
const WrapperTypeInfo* wrapper_type_info) {
v8::Object::Wrap(isolate, wrapper, static_cast<ScriptWrappable*>(nullptr),
wrapper_type_info->this_tag);
}
inline void V8DOMWrapper::SetNativeInfoForGlobal(v8::Isolate* isolate,
v8::Local<v8::Object> wrapper,
ScriptWrappable* wrappable) {
DCHECK(wrappable);
DCHECK(!WrapperTypeInfo::HasLegacyInternalFieldsSet(wrapper));
const WrapperTypeInfo* wrapper_type_info = ToWrapperTypeInfo(wrappable);
v8::Object::WrapGlobal(isolate, wrapper, wrappable,
wrapper_type_info->this_tag);
}
inline void V8DOMWrapper::ClearNativeInfoForGlobal(
v8::Isolate* isolate,
v8::Local<v8::Object> wrapper,
const WrapperTypeInfo* wrapper_type_info) {
v8::Object::WrapGlobal(isolate, wrapper,
static_cast<ScriptWrappable*>(nullptr),
wrapper_type_info->this_tag);
}
inline bool V8DOMWrapper::CheckNativeInfoForGlobal(
v8::Isolate* isolate,
v8::Local<v8::Object> wrapper,
const WrapperTypeInfo* wrapper_type_info) {
v8::CppHeapPointerTagRange tag_range(wrapper_type_info->this_tag,
wrapper_type_info->max_subclass_tag);
return v8::Object::CheckGlobalWrappable(isolate, wrapper, tag_range);
}
inline v8::Local<v8::Object> V8DOMWrapper::AssociateObjectWithWrapper(
v8::Isolate* isolate,
ScriptWrappable* impl,
const WrapperTypeInfo* wrapper_type_info,
v8::Local<v8::Object> wrapper) {
RUNTIME_CALL_TIMER_SCOPE(
isolate, RuntimeCallStats::CounterId::kAssociateObjectWithWrapper);
if (DOMDataStore::SetWrapper(isolate, impl, wrapper_type_info, wrapper)) {
SetNativeInfo(isolate, wrapper, impl);
DCHECK(HasInternalFieldsSet(isolate, wrapper));
}
SECURITY_CHECK(ToAnyScriptWrappable(isolate, wrapper) == impl);
return wrapper;
}
class V8WrapperInstantiationScope final {
STACK_ALLOCATED();
public:
V8WrapperInstantiationScope(ScriptState* script_state)
: context_(script_state->GetIsolate()->GetCurrentContext()) {
v8::Local<v8::Context> context_for_wrapper = script_state->GetContext();
// For performance, we enter the context only if the currently running
// context is different from the context that we are about to enter.
if (context_for_wrapper == context_) [[likely]] {
return;
}
did_enter_context_ = true;
context_ = context_for_wrapper;
context_->Enter();
}
~V8WrapperInstantiationScope() {
if (!did_enter_context_) [[likely]] {
return;
}
context_->Exit();
}
v8::Local<v8::Context> GetContext() const { return context_; }
private:
bool did_enter_context_ = false;
v8::Local<v8::Context> context_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_DOM_WRAPPER_H_
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