managed.cc

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// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#include "src/objects/managed.h"
 
#include "src/handles/global-handles-inl.h"
#include "src/sandbox/external-pointer-table-inl.h"
 
namespace v8 {
namespace internal {
 
namespace {
// Called by the GC in its second pass when a Managed<CppType> is
// garbage collected.
void ManagedObjectFinalizerSecondPass(const v8::WeakCallbackInfo<void>& data) {
  auto destructor =
      reinterpret_cast<ManagedPtrDestructor*>(data.GetParameter());
  Isolate* isolate = reinterpret_cast<Isolate*>(data.GetIsolate());
  isolate->UnregisterManagedPtrDestructor(destructor);
  destructor->destructor_(destructor->shared_ptr_ptr_);
  destructor->external_memory_accounter_.Decrease(
      reinterpret_cast<v8::Isolate*>(isolate), destructor->estimated_size_);
#ifdef V8_ENABLE_SANDBOX
  destructor->ZapExternalPointerTableEntry();
#endif  // V8_ENABLE_SANDBOX
  delete destructor;
}
}  // namespace
 
// Called by the GC in its first pass when a Managed<CppType> is
// garbage collected.
void ManagedObjectFinalizer(const v8::WeakCallbackInfo<void>& data) {
  auto destructor =
      reinterpret_cast<ManagedPtrDestructor*>(data.GetParameter());
  GlobalHandles::Destroy(destructor->global_handle_location_);
  // We need to do the main work as a second pass callback because
  // it can trigger garbage collection. The first pass callbacks
  // are not allowed to invoke V8 API.
  data.SetSecondPassCallback(&ManagedObjectFinalizerSecondPass);
}
 
}  // namespace internal
}  // namespace v8