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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 {
namespace {
void FreeAllocationsHelper(
Heap* heap, const std::vector<JSArrayBuffer::Allocation>& allocations) {
for (JSArrayBuffer::Allocation alloc : allocations) {
JSArrayBuffer::FreeBackingStore(heap->isolate(), alloc);
}
}
} // namespace
void ArrayBufferCollector::QueueOrFreeGarbageAllocations(
std::vector<JSArrayBuffer::Allocation> allocations) {
if (heap_->ShouldReduceMemory()) {
FreeAllocationsHelper(heap_, allocations);
} else {
base::MutexGuard guard(&allocations_mutex_);
allocations_.push_back(std::move(allocations));
}
}
void ArrayBufferCollector::PerformFreeAllocations() {
base::MutexGuard guard(&allocations_mutex_);
for (const std::vector<JSArrayBuffer::Allocation>& allocations :
allocations_) {
FreeAllocationsHelper(heap_, allocations);
}
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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