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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/heap/array-buffer-tracker.h" | |
| 6 #include "src/heap/heap.h" | |
| 7 #include "src/heap/mark-compact.h" | |
| 8 #include "src/isolate.h" | |
| 9 | |
| 10 namespace v8 { | |
| 11 namespace internal { | |
| 12 | |
| 13 template <typename Callback> | |
| 14 void LocalArrayBufferTracker::Process(Callback callback) { | |
| 15 JSArrayBuffer* new_buffer = nullptr; | |
| 16 size_t freed_memory = 0; | |
| 17 for (TrackingMap::iterator it = live_.begin(); it != live_.end();) { | |
| 18 switch (callback(it->first, &new_buffer)) { | |
| 19 case kKeepEntry: | |
| 20 it++; | |
| 21 break; | |
| 22 case kKeepAndUpdateEntry: | |
| 23 DCHECK_NOT_NULL(new_buffer); | |
| 24 if (Marking::IsBlack(Marking::MarkBitFrom(new_buffer))) { | |
| 25 Page::FromAddress(new_buffer->address()) | |
| 26 ->local_tracker<Page::kCreateIfNotPresent>() | |
| 27 ->AddLive(new_buffer, it->second); | |
| 28 } else { | |
| 29 Page::FromAddress(new_buffer->address()) | |
| 30 ->local_tracker<Page::kCreateIfNotPresent>() | |
| 31 ->Add(new_buffer, it->second); | |
| 32 } | |
| 33 live_.erase(it++); | |
| 34 break; | |
| 35 case kRemoveEntry: | |
| 36 heap_->isolate()->array_buffer_allocator()->Free(it->second.first, | |
| 37 it->second.second); | |
| 38 freed_memory += it->second.second; | |
| 39 live_.erase(it++); | |
| 40 break; | |
| 41 default: | |
| 42 UNREACHABLE(); | |
| 43 } | |
| 44 } | |
| 45 if (freed_memory > 0) { | |
| 46 heap_->update_amount_of_external_allocated_freed_memory( | |
| 47 static_cast<intptr_t>(freed_memory)); | |
| 48 } | |
| 49 not_yet_discovered_.clear(); | |
| 50 started_ = false; | |
| 51 } | |
| 52 | |
| 53 template <LocalArrayBufferTracker::LivenessIndicator liveness_indicator> | |
| 54 void LocalArrayBufferTracker::ScanAndFreeDead() { | |
| 55 switch (liveness_indicator) { | |
| 56 case kForwardingPointer: | |
| 57 Process([](JSArrayBuffer* old_buffer, JSArrayBuffer** new_buffer) { | |
| 58 MapWord map_word = old_buffer->map_word(); | |
| 59 if (map_word.IsForwardingAddress()) { | |
| 60 *new_buffer = JSArrayBuffer::cast(map_word.ToForwardingAddress()); | |
| 61 return LocalArrayBufferTracker::kKeepAndUpdateEntry; | |
| 62 } | |
| 63 return LocalArrayBufferTracker::kRemoveEntry; | |
| 64 }); | |
| 65 break; | |
| 66 case kMarkBit: | |
| 67 Process([](JSArrayBuffer* old_buffer, JSArrayBuffer**) { | |
| 68 if (Marking::IsBlackOrGrey(Marking::MarkBitFrom(old_buffer))) { | |
| 69 return LocalArrayBufferTracker::kKeepEntry; | |
| 70 } | |
| 71 return LocalArrayBufferTracker::kRemoveEntry; | |
| 72 }); | |
| 73 break; | |
| 74 case kForwardingPointerOrMarkBit: | |
| 75 Process([](JSArrayBuffer* old_buffer, JSArrayBuffer** new_buffer) { | |
| 76 if (Marking::IsBlackOrGrey(Marking::MarkBitFrom(old_buffer))) { | |
| 77 return LocalArrayBufferTracker::kKeepEntry; | |
| 78 } | |
| 79 MapWord map_word = old_buffer->map_word(); | |
| 80 if (map_word.IsForwardingAddress()) { | |
| 81 *new_buffer = JSArrayBuffer::cast(map_word.ToForwardingAddress()); | |
| 82 return LocalArrayBufferTracker::kKeepAndUpdateEntry; | |
| 83 } | |
| 84 return LocalArrayBufferTracker::kRemoveEntry; | |
| 85 }); | |
| 86 break; | |
| 87 default: | |
| 88 UNREACHABLE(); | |
| 89 } | |
| 90 } | |
| 91 | |
| 92 } // namespace internal | |
| 93 } // namespace v8 | |
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Chromium Code Reviews
Issue 2028503003:
Revert of Reland "[heap] Fine-grained JSArrayBuffer tracking" (Closed)
Base URL: https://chromium.googlesource.com/v8/v8.git@master