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| 1 // Copyright 2016 the V8 project authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "src/conversions-inl.h" |
| 6 #include "src/heap/array-buffer-tracker.h" |
| 7 #include "src/heap/heap.h" |
| 8 #include "src/objects.h" |
| 9 |
| 10 namespace v8 { |
| 11 namespace internal { |
| 12 |
| 13 void ArrayBufferTracker::RegisterNew(Heap* heap, JSArrayBuffer* buffer) { |
| 14 void* data = buffer->backing_store(); |
| 15 if (!data) return; |
| 16 |
| 17 size_t length = NumberToSize(heap->isolate(), buffer->byte_length()); |
| 18 Page* page = Page::FromAddress(buffer->address()); |
| 19 { |
| 20 base::LockGuard<base::Mutex> guard(page->mutex()); |
| 21 LocalArrayBufferTracker* tracker = page->local_tracker(); |
| 22 if (tracker == nullptr) { |
| 23 page->AllocateLocalTracker(); |
| 24 tracker = page->local_tracker(); |
| 25 } |
| 26 DCHECK_NOT_NULL(tracker); |
| 27 tracker->Add(buffer, std::make_pair(data, length)); |
| 28 } |
| 29 // We may go over the limit of externally allocated memory here. We call the |
| 30 // api function to trigger a GC in this case. |
| 31 reinterpret_cast<v8::Isolate*>(heap->isolate()) |
| 32 ->AdjustAmountOfExternalAllocatedMemory(length); |
| 33 } |
| 34 |
| 35 void ArrayBufferTracker::Unregister(Heap* heap, JSArrayBuffer* buffer) { |
| 36 void* data = buffer->backing_store(); |
| 37 if (!data) return; |
| 38 |
| 39 Page* page = Page::FromAddress(buffer->address()); |
| 40 size_t length = 0; |
| 41 { |
| 42 base::LockGuard<base::Mutex> guard(page->mutex()); |
| 43 LocalArrayBufferTracker* tracker = page->local_tracker(); |
| 44 DCHECK_NOT_NULL(tracker); |
| 45 length = tracker->Remove(buffer).second; |
| 46 } |
| 47 heap->update_amount_of_external_allocated_memory( |
| 48 -static_cast<intptr_t>(length)); |
| 49 } |
| 50 |
| 51 void LocalArrayBufferTracker::Add(Key key, const Value& value) { |
| 52 auto ret = array_buffers_.insert(std::make_pair(key, value)); |
| 53 USE(ret); |
| 54 // Check that we indeed inserted a new value and did not overwrite an existing |
| 55 // one (which would be a bug). |
| 56 DCHECK(ret.second); |
| 57 } |
| 58 |
| 59 LocalArrayBufferTracker::Value LocalArrayBufferTracker::Remove(Key key) { |
| 60 TrackingMap::iterator it = array_buffers_.find(key); |
| 61 DCHECK(it != array_buffers_.end()); |
| 62 Value value = it->second; |
| 63 array_buffers_.erase(it); |
| 64 return value; |
| 65 } |
| 66 |
| 67 } // namespace internal |
| 68 } // namespace v8 |
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