process-heap.cc

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// Copyright 2020 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/heap/cppgc/process-heap.h"
 
#include <algorithm>
#include <vector>
 
#include "src/base/lazy-instance.h"
#include "src/base/logging.h"
#include "src/base/platform/mutex.h"
#include "src/heap/cppgc/heap-base.h"
#include "src/heap/cppgc/page-memory.h"
 
namespace cppgc {
namespace internal {
 
v8::base::LazyMutex ProcessGlobalLock::process_mutex_ = LAZY_MUTEX_INITIALIZER;
 
namespace {
 
v8::base::LazyMutex g_heap_registry_mutex = LAZY_MUTEX_INITIALIZER;
 
HeapRegistry::Storage& GetHeapRegistryStorage() {
  static v8::base::LazyInstance<HeapRegistry::Storage>::type heap_registry =
      LAZY_INSTANCE_INITIALIZER;
  return *heap_registry.Pointer();
}
 
}  // namespace
 
// static
void HeapRegistry::RegisterHeap(HeapBase& heap) {
  v8::base::MutexGuard guard(g_heap_registry_mutex.Pointer());
 
  auto& storage = GetHeapRegistryStorage();
  DCHECK_EQ(storage.end(), std::find(storage.begin(), storage.end(), &heap));
  storage.push_back(&heap);
}
 
// static
void HeapRegistry::UnregisterHeap(HeapBase& heap) {
  v8::base::MutexGuard guard(g_heap_registry_mutex.Pointer());
 
  // HeapRegistry requires access to PageBackend which means it must still
  // be present by the time a heap is removed from the registry.
  DCHECK_NOT_NULL(heap.page_backend());
 
  auto& storage = GetHeapRegistryStorage();
  const auto pos = std::find(storage.begin(), storage.end(), &heap);
  DCHECK_NE(storage.end(), pos);
  storage.erase(pos);
}
 
// static
HeapBase* HeapRegistry::TryFromManagedPointer(const void* needle) {
  v8::base::MutexGuard guard(g_heap_registry_mutex.Pointer());
 
  for (auto* heap : GetHeapRegistryStorage()) {
    const auto address =
        heap->page_backend()->Lookup(reinterpret_cast<ConstAddress>(needle));
    if (address) return heap;
  }
  return nullptr;
}
 
// static
const HeapRegistry::Storage& HeapRegistry::GetRegisteredHeapsForTesting() {
  return GetHeapRegistryStorage();
}
 
}  // namespace internal
}  // namespace cppgc