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// Copyright 2017 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/array-buffer-collector.h"
#include "src/base/template-utils.h"
#include "src/heap/array-buffer-tracker.h"
#include "src/heap/gc-tracer.h"
#include "src/heap/heap-inl.h"
#include "src/tasks/cancelable-task.h"
#include "src/tasks/task-utils.h"
namespace v8 {
namespace internal {
void ArrayBufferCollector::QueueOrFreeGarbageAllocations(
std::vector<std::shared_ptr<BackingStore>> backing_stores) {
if (heap_->ShouldReduceMemory()) {
// Destruct the vector, which destructs the std::shared_ptrs, freeing
// the backing stores.
backing_stores.clear();
} else {
base::MutexGuard guard(&allocations_mutex_);
allocations_.push_back(std::move(backing_stores));
}
}
void ArrayBufferCollector::PerformFreeAllocations() {
base::MutexGuard guard(&allocations_mutex_);
// Destruct the vector, which destructs the vecotr of std::shared_ptrs,
// freeing the backing stores if their refcount drops to zero.
allocations_.clear();
}
void ArrayBufferCollector::FreeAllocations() {
// TODO(wez): Remove backing-store from external memory accounting.
heap_->account_external_memory_concurrently_freed();
if (!heap_->IsTearingDown() && !heap_->ShouldReduceMemory() &&
FLAG_concurrent_array_buffer_freeing) {
V8::GetCurrentPlatform()->CallOnWorkerThread(
MakeCancelableTask(heap_->isolate(), [this] {
TRACE_BACKGROUND_GC(
heap_->tracer(),
GCTracer::BackgroundScope::BACKGROUND_ARRAY_BUFFER_FREE);
PerformFreeAllocations();
}));
} else {
// Fallback for when concurrency is disabled/restricted. This is e.g. the
// case when the GC should reduce memory. For such GCs the
// QueueOrFreeGarbageAllocations() call would immediately free the
// allocations and this call would free already queued ones.
PerformFreeAllocations();
}
}
} // namespace internal
} // namespace v8
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