Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 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_external_memory(-static_cast<intptr_t>(length)); |
| 48 | } |
| 49 | |
| 50 | void LocalArrayBufferTracker::Add(Key key, const Value& value) { |
| 51 | auto ret = array_buffers_.insert(std::make_pair(key, value)); |
| 52 | USE(ret); |
| 53 | // Check that we indeed inserted a new value and did not overwrite an existing |
| 54 | // one (which would be a bug). |
| 55 | DCHECK(ret.second); |
| 56 | } |
| 57 | |
| 58 | LocalArrayBufferTracker::Value LocalArrayBufferTracker::Remove(Key key) { |
| 59 | TrackingMap::iterator it = array_buffers_.find(key); |
| 60 | DCHECK(it != array_buffers_.end()); |
| 61 | Value value = it->second; |
| 62 | array_buffers_.erase(it); |
| 63 | return value; |
| 64 | } |
| 65 | |
| 66 | } // namespace internal |
| 67 | } // namespace v8 |