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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 g_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
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