Line data Source code
1 : // Copyright 2015 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/array-buffer-tracker-inl.h"
7 : #include "src/heap/heap.h"
8 :
9 : namespace v8 {
10 : namespace internal {
11 :
12 185555 : LocalArrayBufferTracker::~LocalArrayBufferTracker() {
13 185555 : CHECK(array_buffers_.empty());
14 185563 : }
15 :
16 : template <LocalArrayBufferTracker::FreeMode free_mode>
17 152199 : void LocalArrayBufferTracker::Free() {
18 : size_t freed_memory = 0;
19 337863 : for (TrackingData::iterator it = array_buffers_.begin();
20 : it != array_buffers_.end();) {
21 33465 : JSArrayBuffer* buffer = reinterpret_cast<JSArrayBuffer*>(it->first);
22 : // TODO(mlippautz): Create a dependency on the collector to avoid getting
23 : // the marking state out of thin air.
24 6542 : if ((free_mode == kFreeAll) ||
25 : ObjectMarking::IsWhite(buffer, MarkingState::Internal(buffer))) {
26 28915 : const size_t len = it->second;
27 86745 : heap_->isolate()->array_buffer_allocator()->Free(buffer->backing_store(),
28 28915 : len);
29 28916 : freed_memory += len;
30 : it = array_buffers_.erase(it);
31 : } else {
32 : ++it;
33 : }
34 : }
35 152199 : if (freed_memory > 0) {
36 : heap_->update_external_memory_concurrently_freed(
37 2945 : static_cast<intptr_t>(freed_memory));
38 : }
39 152199 : }
40 :
41 : template <typename Callback>
42 252410 : void LocalArrayBufferTracker::Process(Callback callback) {
43 252410 : JSArrayBuffer* new_buffer = nullptr;
44 : size_t freed_memory = 0;
45 622385 : for (TrackingData::iterator it = array_buffers_.begin();
46 : it != array_buffers_.end();) {
47 117565 : const CallbackResult result = callback(it->first, &new_buffer);
48 117565 : if (result == kKeepEntry) {
49 : ++it;
50 117565 : } else if (result == kUpdateEntry) {
51 : DCHECK_NOT_NULL(new_buffer);
52 19762 : Page* target_page = Page::FromAddress(new_buffer->address());
53 : // We need to lock the target page because we cannot guarantee
54 : // exclusive access to new space pages.
55 34061 : if (target_page->InNewSpace()) target_page->mutex()->Lock();
56 : LocalArrayBufferTracker* tracker = target_page->local_tracker();
57 19762 : if (tracker == nullptr) {
58 1094 : target_page->AllocateLocalTracker();
59 : tracker = target_page->local_tracker();
60 : }
61 : DCHECK_NOT_NULL(tracker);
62 19762 : tracker->Add(new_buffer, it->second);
63 32967 : if (target_page->InNewSpace()) target_page->mutex()->Unlock();
64 : it = array_buffers_.erase(it);
65 97803 : } else if (result == kRemoveEntry) {
66 97803 : const size_t len = it->second;
67 293409 : heap_->isolate()->array_buffer_allocator()->Free(
68 97803 : it->first->backing_store(), len);
69 97803 : freed_memory += len;
70 : it = array_buffers_.erase(it);
71 : } else {
72 0 : UNREACHABLE();
73 : }
74 : }
75 252410 : if (freed_memory > 0) {
76 : heap_->update_external_memory_concurrently_freed(
77 3263 : static_cast<intptr_t>(freed_memory));
78 : }
79 252410 : }
80 :
81 137490 : void ArrayBufferTracker::FreeDeadInNewSpace(Heap* heap) {
82 : DCHECK_EQ(heap->gc_state(), Heap::HeapState::SCAVENGE);
83 433857 : for (Page* page : PageRange(heap->new_space()->FromSpaceStart(),
84 137490 : heap->new_space()->FromSpaceEnd())) {
85 : bool empty = ProcessBuffers(page, kUpdateForwardedRemoveOthers);
86 182556 : CHECK(empty);
87 : }
88 68745 : heap->account_external_memory_concurrently_freed();
89 68745 : }
90 :
91 479824 : void ArrayBufferTracker::FreeDead(Page* page) {
92 : // Callers need to ensure having the page lock.
93 479824 : LocalArrayBufferTracker* tracker = page->local_tracker();
94 959648 : if (tracker == nullptr) return;
95 : DCHECK(!page->SweepingDone());
96 4858 : tracker->Free<LocalArrayBufferTracker::kFreeDead>();
97 4858 : if (tracker->IsEmpty()) {
98 1372 : page->ReleaseLocalTracker();
99 : }
100 : }
101 :
102 630318 : void ArrayBufferTracker::FreeAll(Page* page) {
103 630318 : LocalArrayBufferTracker* tracker = page->local_tracker();
104 1260636 : if (tracker == nullptr) return;
105 147341 : tracker->Free<LocalArrayBufferTracker::kFreeAll>();
106 147341 : if (tracker->IsEmpty()) {
107 147341 : page->ReleaseLocalTracker();
108 : }
109 : }
110 :
111 79550 : bool ArrayBufferTracker::ProcessBuffers(Page* page, ProcessingMode mode) {
112 262106 : LocalArrayBufferTracker* tracker = page->local_tracker();
113 262106 : if (tracker == nullptr) return true;
114 :
115 : DCHECK(page->SweepingDone());
116 : tracker->Process(
117 117565 : [mode](JSArrayBuffer* old_buffer, JSArrayBuffer** new_buffer) {
118 : MapWord map_word = old_buffer->map_word();
119 117565 : if (map_word.IsForwardingAddress()) {
120 19762 : *new_buffer = JSArrayBuffer::cast(map_word.ToForwardingAddress());
121 19762 : return LocalArrayBufferTracker::kUpdateEntry;
122 : }
123 97803 : return mode == kUpdateForwardedKeepOthers
124 : ? LocalArrayBufferTracker::kKeepEntry
125 97803 : : LocalArrayBufferTracker::kRemoveEntry;
126 252410 : });
127 70074 : return tracker->IsEmpty();
128 : }
129 :
130 244 : bool ArrayBufferTracker::IsTracked(JSArrayBuffer* buffer) {
131 244 : Page* page = Page::FromAddress(buffer->address());
132 : {
133 488 : base::LockGuard<base::RecursiveMutex> guard(page->mutex());
134 : LocalArrayBufferTracker* tracker = page->local_tracker();
135 244 : if (tracker == nullptr) return false;
136 216 : return tracker->IsTracked(buffer);
137 : }
138 : }
139 :
140 : } // namespace internal
141 : } // namespace v8
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