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// Copyright 2016 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/conversions-inl.h"
#include "src/heap/array-buffer-tracker.h"
#include "src/heap/heap.h"
#include "src/objects.h"
namespace v8 {
namespace internal {
void ArrayBufferTracker::RegisterNew(Heap* heap, JSArrayBuffer* buffer) {
void* data = buffer->backing_store();
if (!data) return;
size_t length = NumberToSize(buffer->byte_length());
Page* page = Page::FromAddress(buffer->address());
{
base::LockGuard<base::Mutex> guard(page->mutex());
LocalArrayBufferTracker* tracker = page->local_tracker();
if (tracker == nullptr) {
page->AllocateLocalTracker();
tracker = page->local_tracker();
}
DCHECK_NOT_NULL(tracker);
tracker->Add(buffer, length);
}
// We may go over the limit of externally allocated memory here. We call the
// api function to trigger a GC in this case.
reinterpret_cast<v8::Isolate*>(heap->isolate())
->AdjustAmountOfExternalAllocatedMemory(length);
}
void ArrayBufferTracker::Unregister(Heap* heap, JSArrayBuffer* buffer) {
void* data = buffer->backing_store();
if (!data) return;
Page* page = Page::FromAddress(buffer->address());
size_t length = 0;
{
base::LockGuard<base::Mutex> guard(page->mutex());
LocalArrayBufferTracker* tracker = page->local_tracker();
DCHECK_NOT_NULL(tracker);
length = tracker->Remove(buffer);
}
heap->update_external_memory(-static_cast<intptr_t>(length));
}
void LocalArrayBufferTracker::Add(Key key, const Value& value) {
auto ret = array_buffers_.insert(std::make_pair(key, value));
USE(ret);
// Check that we indeed inserted a new value and did not overwrite an existing
// one (which would be a bug).
DCHECK(ret.second);
}
LocalArrayBufferTracker::Value LocalArrayBufferTracker::Remove(Key key) {
TrackingData::iterator it = array_buffers_.find(key);
// Check that we indeed find a key to remove.
DCHECK(it != array_buffers_.end());
Value value = it->second;
array_buffers_.erase(it);
return value;
}
} // namespace internal
} // namespace v8
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