Line data Source code
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 131363 : void ArrayBufferTracker::RegisterNew(Heap* heap, JSArrayBuffer* buffer) {
14 : void* data = buffer->backing_store();
15 262726 : if (!data) return;
16 :
17 131363 : size_t length = NumberToSize(buffer->byte_length());
18 131363 : Page* page = Page::FromAddress(buffer->address());
19 : {
20 262765 : base::LockGuard<base::RecursiveMutex> guard(page->mutex());
21 : LocalArrayBufferTracker* tracker = page->local_tracker();
22 131363 : if (tracker == nullptr) {
23 39 : page->AllocateLocalTracker();
24 : tracker = page->local_tracker();
25 : }
26 : DCHECK_NOT_NULL(tracker);
27 : tracker->Add(buffer, 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 131363 : ->AdjustAmountOfExternalAllocatedMemory(length);
33 : }
34 :
35 3483 : void ArrayBufferTracker::Unregister(Heap* heap, JSArrayBuffer* buffer) {
36 : void* data = buffer->backing_store();
37 6966 : if (!data) return;
38 :
39 3468 : Page* page = Page::FromAddress(buffer->address());
40 : size_t length = 0;
41 : {
42 6936 : base::LockGuard<base::RecursiveMutex> guard(page->mutex());
43 : LocalArrayBufferTracker* tracker = page->local_tracker();
44 : DCHECK_NOT_NULL(tracker);
45 3468 : length = tracker->Remove(buffer);
46 : }
47 3468 : heap->update_external_memory(-static_cast<intptr_t>(length));
48 : }
49 :
50 : void LocalArrayBufferTracker::Add(Key key, const Value& value) {
51 302334 : 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 3468 : LocalArrayBufferTracker::Value LocalArrayBufferTracker::Remove(Key key) {
59 : TrackingData::iterator it = array_buffers_.find(key);
60 : // Check that we indeed find a key to remove.
61 : DCHECK(it != array_buffers_.end());
62 3468 : Value value = it->second;
63 : array_buffers_.erase(it);
64 3468 : return value;
65 : }
66 :
67 : } // namespace internal
68 : } // namespace v8
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