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// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/heap/array-buffer-tracker.h"
#include "src/heap/array-buffer-tracker-inl.h"
#include "src/heap/heap.h"
namespace v8 {
namespace internal {
LocalArrayBufferTracker::~LocalArrayBufferTracker() {
CHECK(array_buffers_.empty());
}
template <LocalArrayBufferTracker::FreeMode free_mode>
void LocalArrayBufferTracker::Free() {
size_t freed_memory = 0;
for (TrackingData::iterator it = array_buffers_.begin();
it != array_buffers_.end();) {
JSArrayBuffer* buffer = reinterpret_cast<JSArrayBuffer*>(it->first);
if ((free_mode == kFreeAll) ||
Marking::IsWhite(ObjectMarking::MarkBitFrom(buffer))) {
const size_t len = it->second;
heap_->isolate()->array_buffer_allocator()->Free(buffer->backing_store(),
len);
freed_memory += len;
it = array_buffers_.erase(it);
} else {
++it;
}
}
if (freed_memory > 0) {
heap_->update_external_memory_concurrently_freed(
static_cast<intptr_t>(freed_memory));
}
}
template <typename Callback>
void LocalArrayBufferTracker::Process(Callback callback) {
JSArrayBuffer* new_buffer = nullptr;
size_t freed_memory = 0;
for (TrackingData::iterator it = array_buffers_.begin();
it != array_buffers_.end();) {
const CallbackResult result = callback(it->first, &new_buffer);
if (result == kKeepEntry) {
++it;
} else if (result == kUpdateEntry) {
DCHECK_NOT_NULL(new_buffer);
Page* target_page = Page::FromAddress(new_buffer->address());
// We need to lock the target page because we cannot guarantee
// exclusive access to new space pages.
if (target_page->InNewSpace()) target_page->mutex()->Lock();
LocalArrayBufferTracker* tracker = target_page->local_tracker();
if (tracker == nullptr) {
target_page->AllocateLocalTracker();
tracker = target_page->local_tracker();
}
DCHECK_NOT_NULL(tracker);
tracker->Add(new_buffer, it->second);
if (target_page->InNewSpace()) target_page->mutex()->Unlock();
it = array_buffers_.erase(it);
} else if (result == kRemoveEntry) {
const size_t len = it->second;
heap_->isolate()->array_buffer_allocator()->Free(
it->first->backing_store(), len);
freed_memory += len;
it = array_buffers_.erase(it);
} else {
UNREACHABLE();
}
}
if (freed_memory > 0) {
heap_->update_external_memory_concurrently_freed(
static_cast<intptr_t>(freed_memory));
}
}
void ArrayBufferTracker::FreeDeadInNewSpace(Heap* heap) {
DCHECK_EQ(heap->gc_state(), Heap::HeapState::SCAVENGE);
for (Page* page : NewSpacePageRange(heap->new_space()->FromSpaceStart(),
heap->new_space()->FromSpaceEnd())) {
bool empty = ProcessBuffers(page, kUpdateForwardedRemoveOthers);
CHECK(empty);
}
heap->account_external_memory_concurrently_freed();
}
void ArrayBufferTracker::FreeDead(Page* page) {
// Callers need to ensure having the page lock.
LocalArrayBufferTracker* tracker = page->local_tracker();
if (tracker == nullptr) return;
DCHECK(!page->SweepingDone());
tracker->Free<LocalArrayBufferTracker::kFreeDead>();
if (tracker->IsEmpty()) {
page->ReleaseLocalTracker();
}
}
void ArrayBufferTracker::FreeAll(Page* page) {
LocalArrayBufferTracker* tracker = page->local_tracker();
if (tracker == nullptr) return;
tracker->Free<LocalArrayBufferTracker::kFreeAll>();
if (tracker->IsEmpty()) {
page->ReleaseLocalTracker();
}
}
bool ArrayBufferTracker::ProcessBuffers(Page* page, ProcessingMode mode) {
LocalArrayBufferTracker* tracker = page->local_tracker();
if (tracker == nullptr) return true;
DCHECK(page->SweepingDone());
tracker->Process(
[mode](JSArrayBuffer* old_buffer, JSArrayBuffer** new_buffer) {
MapWord map_word = old_buffer->map_word();
if (map_word.IsForwardingAddress()) {
*new_buffer = JSArrayBuffer::cast(map_word.ToForwardingAddress());
return LocalArrayBufferTracker::kUpdateEntry;
}
return mode == kUpdateForwardedKeepOthers
? LocalArrayBufferTracker::kKeepEntry
: LocalArrayBufferTracker::kRemoveEntry;
});
return tracker->IsEmpty();
}
bool ArrayBufferTracker::IsTracked(JSArrayBuffer* buffer) {
Page* page = Page::FromAddress(buffer->address());
{
base::LockGuard<base::Mutex> guard(page->mutex());
LocalArrayBufferTracker* tracker = page->local_tracker();
if (tracker == nullptr) return false;
return tracker->IsTracked(buffer);
}
}
} // namespace internal
} // namespace v8
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