[heap] Implement simple concurrent marking deque.

This patch adds a concurrent marking deque that exposes the same interface
for the main thread as the existing marking deque.

The matching interface makes the concurrent marking deque a drop-in
replacement for the sequential marking deque without any change in
mark-compactor and incremental marker.

BUG=chromium:694255

Review-Url: https://codereview.chromium.org/2810893002
Cr-Commit-Position: refs/heads/master@{#45042}
This commit is contained in:
ulan 2017-05-02 10:03:31 -07:00 committed by Commit bot
parent 66f6954064
commit c6816cd87d
14 changed files with 291 additions and 101 deletions

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@ -1567,6 +1567,7 @@ v8_source_set("v8_base") {
"src/heap/array-buffer-tracker.h", "src/heap/array-buffer-tracker.h",
"src/heap/code-stats.cc", "src/heap/code-stats.cc",
"src/heap/code-stats.h", "src/heap/code-stats.h",
"src/heap/concurrent-marking-deque.h",
"src/heap/concurrent-marking.cc", "src/heap/concurrent-marking.cc",
"src/heap/concurrent-marking.h", "src/heap/concurrent-marking.h",
"src/heap/embedder-tracing.cc", "src/heap/embedder-tracing.cc",

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@ -0,0 +1,177 @@
// Copyright 2017 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.
#ifndef V8_HEAP_CONCURRENT_MARKING_DEQUE_
#define V8_HEAP_CONCURRENT_MARKING_DEQUE_
#include <deque>
#include "src/base/platform/mutex.h"
namespace v8 {
namespace internal {
class Heap;
class Isolate;
class HeapObject;
enum class MarkingThread { kMain, kConcurrent };
enum class TargetDeque { kShared, kBailout };
// The concurrent marking deque supports deque operations for two threads:
// main and concurrent. It is implemented using two deques: shared and bailout.
//
// The concurrent thread can use the push and pop operations with the
// MarkingThread::kConcurrent argument. All other operations are intended
// to be used by the main thread only.
//
// The interface of the concurrent marking deque for the main thread matches
// that of the sequential marking deque, so they can be easily switched
// at compile time without updating the main thread call-sites.
//
// The shared deque is shared between the main thread and the concurrent
// thread, so both threads can push to and pop from the shared deque.
// The bailout deque stores objects that cannot be processed by the concurrent
// thread. Only the concurrent thread can push to it and only the main thread
// can pop from it.
class ConcurrentMarkingDeque {
public:
// The heap parameter is needed to match the interface
// of the sequential marking deque.
explicit ConcurrentMarkingDeque(Heap* heap) {}
// Pushes the object into the specified deque assuming that the function is
// called on the specified thread. The main thread can push only to the shared
// deque. The concurrent thread can push to both deques.
bool Push(HeapObject* object, MarkingThread thread = MarkingThread::kMain,
TargetDeque target = TargetDeque::kShared) {
DCHECK_IMPLIES(thread == MarkingThread::kMain,
target == TargetDeque::kShared);
switch (target) {
case TargetDeque::kShared:
shared_deque_.Push(object);
break;
case TargetDeque::kBailout:
bailout_deque_.Push(object);
break;
}
return true;
}
// Pops an object from the bailout or shared deque assuming that the function
// is called on the specified thread. The main thread first tries to pop the
// bailout deque. If the deque is empty then it tries the shared deque.
// If the shared deque is also empty, then the function returns nullptr.
// The concurrent thread pops only from the shared deque.
HeapObject* Pop(MarkingThread thread = MarkingThread::kMain) {
if (thread == MarkingThread::kMain) {
HeapObject* result = bailout_deque_.Pop();
if (result != nullptr) return result;
}
return shared_deque_.Pop();
}
// All the following operations can used only by the main thread.
void Clear() {
bailout_deque_.Clear();
shared_deque_.Clear();
}
bool IsFull() { return false; }
bool IsEmpty() { return bailout_deque_.IsEmpty() && shared_deque_.IsEmpty(); }
int Size() { return bailout_deque_.Size() + shared_deque_.Size(); }
// This is used for a large array with a progress bar.
// For simpicity, unshift to the bailout deque so that the concurrent thread
// does not see such objects.
bool Unshift(HeapObject* object) {
bailout_deque_.Unshift(object);
return true;
}
// Calls the specified callback on each element of the deques and replaces
// the element with the result of the callback. If the callback returns
// nullptr then the element is removed from the deque.
// The callback must accept HeapObject* and return HeapObject*.
template <typename Callback>
void Update(Callback callback) {
bailout_deque_.Update(callback);
shared_deque_.Update(callback);
}
// These empty functions are needed to match the interface
// of the sequential marking deque.
void SetUp() {}
void TearDown() {}
void StartUsing() {}
void StopUsing() {}
void ClearOverflowed() {}
void SetOverflowed() {}
bool overflowed() const { return false; }
private:
// Simple, slow, and thread-safe deque that forwards all operations to
// a lock-protected std::deque.
class Deque {
public:
Deque() { cache_padding_[0] = 0; }
void Clear() {
base::LockGuard<base::Mutex> guard(&mutex_);
return deque_.clear();
}
bool IsEmpty() {
base::LockGuard<base::Mutex> guard(&mutex_);
return deque_.empty();
}
int Size() {
base::LockGuard<base::Mutex> guard(&mutex_);
return static_cast<int>(deque_.size());
}
void Push(HeapObject* object) {
base::LockGuard<base::Mutex> guard(&mutex_);
deque_.push_back(object);
}
HeapObject* Pop() {
base::LockGuard<base::Mutex> guard(&mutex_);
if (deque_.empty()) return nullptr;
HeapObject* result = deque_.back();
deque_.pop_back();
return result;
}
void Unshift(HeapObject* object) {
base::LockGuard<base::Mutex> guard(&mutex_);
deque_.push_front(object);
}
template <typename Callback>
void Update(Callback callback) {
base::LockGuard<base::Mutex> guard(&mutex_);
std::deque<HeapObject*> new_deque;
for (auto object : deque_) {
HeapObject* new_object = callback(object);
if (new_object) {
new_deque.push_back(new_object);
}
}
deque_.swap(new_deque);
}
private:
base::Mutex mutex_;
std::deque<HeapObject*> deque_;
// Ensure that two deques do not share the same cache line.
static int const kCachePadding = 64;
char cache_padding_[kCachePadding];
};
Deque bailout_deque_;
Deque shared_deque_;
DISALLOW_COPY_AND_ASSIGN(ConcurrentMarkingDeque);
};
} // namespace internal
} // namespace v8
#endif // V8_CONCURRENT_MARKING_DEQUE_

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@ -7,6 +7,7 @@
#include <stack> #include <stack>
#include <unordered_map> #include <unordered_map>
#include "src/heap/concurrent-marking-deque.h"
#include "src/heap/heap-inl.h" #include "src/heap/heap-inl.h"
#include "src/heap/heap.h" #include "src/heap/heap.h"
#include "src/heap/marking.h" #include "src/heap/marking.h"
@ -21,43 +22,13 @@
namespace v8 { namespace v8 {
namespace internal { namespace internal {
class ConcurrentMarkingMarkbits {
public:
ConcurrentMarkingMarkbits() {}
~ConcurrentMarkingMarkbits() {
for (auto chunk_bitmap : bitmap_) {
FreeBitmap(chunk_bitmap.second);
}
}
bool Mark(HeapObject* obj) {
Address address = obj->address();
MemoryChunk* chunk = MemoryChunk::FromAddress(address);
if (bitmap_.count(chunk) == 0) {
bitmap_[chunk] = AllocateBitmap();
}
MarkBit mark_bit =
bitmap_[chunk]->MarkBitFromIndex(chunk->AddressToMarkbitIndex(address));
if (mark_bit.Get()) return false;
mark_bit.Set();
return true;
}
Bitmap* AllocateBitmap() {
return static_cast<Bitmap*>(calloc(1, Bitmap::kSize));
}
void FreeBitmap(Bitmap* bitmap) { free(bitmap); }
private:
std::unordered_map<MemoryChunk*, Bitmap*> bitmap_;
};
class ConcurrentMarkingVisitor final class ConcurrentMarkingVisitor final
: public HeapVisitor<int, ConcurrentMarkingVisitor> { : public HeapVisitor<int, ConcurrentMarkingVisitor> {
public: public:
using BaseClass = HeapVisitor<int, ConcurrentMarkingVisitor>; using BaseClass = HeapVisitor<int, ConcurrentMarkingVisitor>;
ConcurrentMarkingVisitor() : bytes_marked_(0) {} explicit ConcurrentMarkingVisitor(ConcurrentMarkingDeque* deque)
: deque_(deque) {}
void VisitPointers(HeapObject* host, Object** start, Object** end) override { void VisitPointers(HeapObject* host, Object** start, Object** end) override {
for (Object** p = start; p < end; p++) { for (Object** p = start; p < end; p++) {
@ -154,84 +125,71 @@ class ConcurrentMarkingVisitor final
} }
void MarkObject(HeapObject* obj) { void MarkObject(HeapObject* obj) {
if (markbits_.Mark(obj)) { deque_->Push(obj, MarkingThread::kConcurrent, TargetDeque::kShared);
marking_stack_.push(obj);
} }
}
void MarkTransitively() {
while (!marking_stack_.empty()) {
HeapObject* obj = marking_stack_.top();
marking_stack_.pop();
bytes_marked_ += IterateBody(obj);
}
}
size_t bytes_marked() { return bytes_marked_; }
private: private:
size_t bytes_marked_; ConcurrentMarkingDeque* deque_;
std::stack<HeapObject*> marking_stack_;
ConcurrentMarkingMarkbits markbits_;
}; };
class ConcurrentMarking::Task : public CancelableTask { class ConcurrentMarking::Task : public CancelableTask {
public: public:
Task(Heap* heap, std::vector<HeapObject*>* root_set, Task(Isolate* isolate, ConcurrentMarking* concurrent_marking,
base::Semaphore* on_finish) base::Semaphore* on_finish)
: CancelableTask(heap->isolate()), : CancelableTask(isolate),
heap_(heap), concurrent_marking_(concurrent_marking),
on_finish_(on_finish), on_finish_(on_finish) {}
root_set_(root_set) {}
virtual ~Task() {} virtual ~Task() {}
private: private:
// v8::internal::CancelableTask overrides. // v8::internal::CancelableTask overrides.
void RunInternal() override { void RunInternal() override {
double time_ms = heap_->MonotonicallyIncreasingTimeInMs(); concurrent_marking_->Run();
{
TimedScope scope(&time_ms);
for (HeapObject* obj : *root_set_) {
marking_visitor_.MarkObject(obj);
}
marking_visitor_.MarkTransitively();
}
if (FLAG_trace_concurrent_marking) {
heap_->isolate()->PrintWithTimestamp(
"concurrently marked %dKB in %.2fms\n",
static_cast<int>(marking_visitor_.bytes_marked() / KB), time_ms);
}
on_finish_->Signal(); on_finish_->Signal();
} }
Heap* heap_; ConcurrentMarking* concurrent_marking_;
base::Semaphore* on_finish_; base::Semaphore* on_finish_;
ConcurrentMarkingVisitor marking_visitor_;
std::vector<HeapObject*>* root_set_;
DISALLOW_COPY_AND_ASSIGN(Task); DISALLOW_COPY_AND_ASSIGN(Task);
}; };
ConcurrentMarking::ConcurrentMarking(Heap* heap) ConcurrentMarking::ConcurrentMarking(Heap* heap, ConcurrentMarkingDeque* deque)
: heap_(heap), pending_task_semaphore_(0), is_task_pending_(false) { : heap_(heap),
pending_task_semaphore_(0),
deque_(deque),
visitor_(new ConcurrentMarkingVisitor(deque_)),
is_task_pending_(false) {
// Concurrent marking does not work with double unboxing. // Concurrent marking does not work with double unboxing.
STATIC_ASSERT(!(V8_CONCURRENT_MARKING && V8_DOUBLE_FIELDS_UNBOXING)); STATIC_ASSERT(!(V8_CONCURRENT_MARKING && V8_DOUBLE_FIELDS_UNBOXING));
// The runtime flag should be set only if the compile time flag was set. // The runtime flag should be set only if the compile time flag was set.
CHECK(!FLAG_concurrent_marking || V8_CONCURRENT_MARKING); CHECK(!FLAG_concurrent_marking || V8_CONCURRENT_MARKING);
} }
ConcurrentMarking::~ConcurrentMarking() {} ConcurrentMarking::~ConcurrentMarking() { delete visitor_; }
void ConcurrentMarking::AddRoot(HeapObject* object) { void ConcurrentMarking::Run() {
root_set_.push_back(object); double time_ms = heap_->MonotonicallyIncreasingTimeInMs();
size_t bytes_marked = 0;
{
TimedScope scope(&time_ms);
HeapObject* object;
while ((object = deque_->Pop(MarkingThread::kConcurrent)) != nullptr) {
bytes_marked += visitor_->IterateBody(object);
}
}
if (FLAG_trace_concurrent_marking) {
heap_->isolate()->PrintWithTimestamp("concurrently marked %dKB in %.2fms\n",
static_cast<int>(bytes_marked / KB),
time_ms);
}
} }
void ConcurrentMarking::StartTask() { void ConcurrentMarking::StartTask() {
if (!FLAG_concurrent_marking) return; if (!FLAG_concurrent_marking) return;
is_task_pending_ = true; is_task_pending_ = true;
V8::GetCurrentPlatform()->CallOnBackgroundThread( V8::GetCurrentPlatform()->CallOnBackgroundThread(
new Task(heap_, &root_set_, &pending_task_semaphore_), new Task(heap_->isolate(), this, &pending_task_semaphore_),
v8::Platform::kShortRunningTask); v8::Platform::kShortRunningTask);
} }
@ -239,7 +197,6 @@ void ConcurrentMarking::WaitForTaskToComplete() {
if (!FLAG_concurrent_marking) return; if (!FLAG_concurrent_marking) return;
pending_task_semaphore_.Wait(); pending_task_semaphore_.Wait();
is_task_pending_ = false; is_task_pending_ = false;
root_set_.clear();
} }
void ConcurrentMarking::EnsureTaskCompleted() { void ConcurrentMarking::EnsureTaskCompleted() {

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@ -5,8 +5,6 @@
#ifndef V8_HEAP_CONCURRENT_MARKING_ #ifndef V8_HEAP_CONCURRENT_MARKING_
#define V8_HEAP_CONCURRENT_MARKING_ #define V8_HEAP_CONCURRENT_MARKING_
#include <vector>
#include "src/allocation.h" #include "src/allocation.h"
#include "src/cancelable-task.h" #include "src/cancelable-task.h"
#include "src/utils.h" #include "src/utils.h"
@ -15,16 +13,16 @@
namespace v8 { namespace v8 {
namespace internal { namespace internal {
class ConcurrentMarkingDeque;
class ConcurrentMarkingVisitor;
class Heap; class Heap;
class Isolate; class Isolate;
class ConcurrentMarking { class ConcurrentMarking {
public: public:
explicit ConcurrentMarking(Heap* heap); ConcurrentMarking(Heap* heap, ConcurrentMarkingDeque* deque_);
~ConcurrentMarking(); ~ConcurrentMarking();
void AddRoot(HeapObject* object);
void StartTask(); void StartTask();
void WaitForTaskToComplete(); void WaitForTaskToComplete();
bool IsTaskPending() { return is_task_pending_; } bool IsTaskPending() { return is_task_pending_; }
@ -32,10 +30,12 @@ class ConcurrentMarking {
private: private:
class Task; class Task;
void Run();
Heap* heap_; Heap* heap_;
base::Semaphore pending_task_semaphore_; base::Semaphore pending_task_semaphore_;
ConcurrentMarkingDeque* deque_;
ConcurrentMarkingVisitor* visitor_;
bool is_task_pending_; bool is_task_pending_;
std::vector<HeapObject*> root_set_;
}; };
} // namespace internal } // namespace internal

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@ -5494,7 +5494,6 @@ bool Heap::SetUp() {
store_buffer_ = new StoreBuffer(this); store_buffer_ = new StoreBuffer(this);
incremental_marking_ = new IncrementalMarking(this); incremental_marking_ = new IncrementalMarking(this);
concurrent_marking_ = new ConcurrentMarking(this);
for (int i = 0; i <= LAST_SPACE; i++) { for (int i = 0; i <= LAST_SPACE; i++) {
space_[i] = nullptr; space_[i] = nullptr;
@ -5543,6 +5542,8 @@ bool Heap::SetUp() {
mark_compact_collector_ = new MarkCompactCollector(this); mark_compact_collector_ = new MarkCompactCollector(this);
incremental_marking_->set_marking_deque( incremental_marking_->set_marking_deque(
mark_compact_collector_->marking_deque()); mark_compact_collector_->marking_deque());
concurrent_marking_ =
new ConcurrentMarking(this, mark_compact_collector_->marking_deque());
if (FLAG_minor_mc) if (FLAG_minor_mc)
minor_mark_compact_collector_ = new MinorMarkCompactCollector(this); minor_mark_compact_collector_ = new MinorMarkCompactCollector(this);
gc_idle_time_handler_ = new GCIdleTimeHandler(); gc_idle_time_handler_ = new GCIdleTimeHandler();

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@ -551,9 +551,6 @@ void IncrementalMarking::StartMarking() {
if (FLAG_concurrent_marking) { if (FLAG_concurrent_marking) {
ConcurrentMarking* concurrent_marking = heap_->concurrent_marking(); ConcurrentMarking* concurrent_marking = heap_->concurrent_marking();
marking_deque()->Iterate([concurrent_marking](HeapObject* obj) {
concurrent_marking->AddRoot(obj);
});
concurrent_marking->StartTask(); concurrent_marking->StartTask();
} }

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@ -10,6 +10,7 @@
#include "src/base/bits.h" #include "src/base/bits.h"
#include "src/base/platform/condition-variable.h" #include "src/base/platform/condition-variable.h"
#include "src/cancelable-task.h" #include "src/cancelable-task.h"
#include "src/heap/concurrent-marking-deque.h"
#include "src/heap/marking.h" #include "src/heap/marking.h"
#include "src/heap/sequential-marking-deque.h" #include "src/heap/sequential-marking-deque.h"
#include "src/heap/spaces.h" #include "src/heap/spaces.h"
@ -31,7 +32,11 @@ class PageParallelJob;
class RecordMigratedSlotVisitor; class RecordMigratedSlotVisitor;
class ThreadLocalTop; class ThreadLocalTop;
#ifdef V8_CONCURRENT_MARKING
using MarkingDeque = ConcurrentMarkingDeque;
#else
using MarkingDeque = SequentialMarkingDeque; using MarkingDeque = SequentialMarkingDeque;
#endif
class ObjectMarking : public AllStatic { class ObjectMarking : public AllStatic {
public: public:

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@ -91,15 +91,6 @@ class SequentialMarkingDeque {
} }
} }
template <typename Callback>
void Iterate(Callback callback) {
int i = bottom_;
while (i != top_) {
callback(array_[i]);
i = (i + 1) & mask_;
}
}
// Calls the specified callback on each element of the deque and replaces // Calls the specified callback on each element of the deque and replaces
// the element with the result of the callback. If the callback returns // the element with the result of the callback. If the callback returns
// nullptr then the element is removed from the deque. // nullptr then the element is removed from the deque.

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@ -951,6 +951,7 @@
'heap/array-buffer-tracker.h', 'heap/array-buffer-tracker.h',
'heap/code-stats.cc', 'heap/code-stats.cc',
'heap/code-stats.h', 'heap/code-stats.h',
'heap/concurrent-marking-deque.h',
'heap/concurrent-marking.cc', 'heap/concurrent-marking.cc',
'heap/concurrent-marking.h', 'heap/concurrent-marking.h',
'heap/embedder-tracing.cc', 'heap/embedder-tracing.cc',

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@ -18,8 +18,9 @@ TEST(ConcurrentMarking) {
if (!i::FLAG_concurrent_marking) return; if (!i::FLAG_concurrent_marking) return;
CcTest::InitializeVM(); CcTest::InitializeVM();
Heap* heap = CcTest::heap(); Heap* heap = CcTest::heap();
ConcurrentMarking* concurrent_marking = new ConcurrentMarking(heap); ConcurrentMarkingDeque deque(heap);
concurrent_marking->AddRoot(heap->undefined_value()); deque.Push(heap->undefined_value());
ConcurrentMarking* concurrent_marking = new ConcurrentMarking(heap, &deque);
concurrent_marking->StartTask(); concurrent_marking->StartTask();
concurrent_marking->WaitForTaskToComplete(); concurrent_marking->WaitForTaskToComplete();
delete concurrent_marking; delete concurrent_marking;

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@ -43,6 +43,7 @@
#include "src/global-handles.h" #include "src/global-handles.h"
#include "src/heap/mark-compact-inl.h" #include "src/heap/mark-compact-inl.h"
#include "src/heap/mark-compact.h" #include "src/heap/mark-compact.h"
#include "src/heap/sequential-marking-deque.h"
#include "src/objects-inl.h" #include "src/objects-inl.h"
#include "test/cctest/cctest.h" #include "test/cctest/cctest.h"
#include "test/cctest/heap/heap-tester.h" #include "test/cctest/heap/heap-tester.h"
@ -51,10 +52,9 @@
using namespace v8::internal; using namespace v8::internal;
using v8::Just; using v8::Just;
TEST(SequentialMarkingDeque) {
TEST(MarkingDeque) {
CcTest::InitializeVM(); CcTest::InitializeVM();
MarkingDeque s(CcTest::i_isolate()->heap()); SequentialMarkingDeque s(CcTest::i_isolate()->heap());
s.SetUp(); s.SetUp();
s.StartUsing(); s.StartUsing();
Address original_address = reinterpret_cast<Address>(&s); Address original_address = reinterpret_cast<Address>(&s);

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@ -100,6 +100,7 @@ v8_executable("unittests") {
"eh-frame-iterator-unittest.cc", "eh-frame-iterator-unittest.cc",
"eh-frame-writer-unittest.cc", "eh-frame-writer-unittest.cc",
"heap/bitmap-unittest.cc", "heap/bitmap-unittest.cc",
"heap/concurrent-marking-deque-unittest.cc",
"heap/embedder-tracing-unittest.cc", "heap/embedder-tracing-unittest.cc",
"heap/gc-idle-time-handler-unittest.cc", "heap/gc-idle-time-handler-unittest.cc",
"heap/gc-tracer-unittest.cc", "heap/gc-tracer-unittest.cc",

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@ -0,0 +1,57 @@
// Copyright 2017 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 <stdlib.h>
#include "src/globals.h"
#include "src/heap/concurrent-marking-deque.h"
#include "src/heap/heap-inl.h"
#include "src/isolate.h"
#include "test/unittests/test-utils.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace v8 {
namespace internal {
class ConcurrentMarkingDequeTest : public TestWithIsolate {
public:
ConcurrentMarkingDequeTest() {
marking_deque_ = new ConcurrentMarkingDeque(i_isolate()->heap());
object_ = i_isolate()->heap()->undefined_value();
}
~ConcurrentMarkingDequeTest() { delete marking_deque_; }
ConcurrentMarkingDeque* marking_deque() { return marking_deque_; }
HeapObject* object() { return object_; }
private:
ConcurrentMarkingDeque* marking_deque_;
HeapObject* object_;
DISALLOW_COPY_AND_ASSIGN(ConcurrentMarkingDequeTest);
};
TEST_F(ConcurrentMarkingDequeTest, Empty) {
EXPECT_TRUE(marking_deque()->IsEmpty());
EXPECT_EQ(0, marking_deque()->Size());
}
TEST_F(ConcurrentMarkingDequeTest, SharedDeque) {
marking_deque()->Push(object());
EXPECT_FALSE(marking_deque()->IsEmpty());
EXPECT_EQ(1, marking_deque()->Size());
EXPECT_EQ(object(), marking_deque()->Pop(MarkingThread::kConcurrent));
}
TEST_F(ConcurrentMarkingDequeTest, BailoutDeque) {
marking_deque()->Push(object(), MarkingThread::kConcurrent,
TargetDeque::kBailout);
EXPECT_FALSE(marking_deque()->IsEmpty());
EXPECT_EQ(1, marking_deque()->Size());
EXPECT_EQ(nullptr, marking_deque()->Pop(MarkingThread::kConcurrent));
}
} // namespace internal
} // namespace v8

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@ -97,6 +97,7 @@
'eh-frame-iterator-unittest.cc', 'eh-frame-iterator-unittest.cc',
'eh-frame-writer-unittest.cc', 'eh-frame-writer-unittest.cc',
'heap/bitmap-unittest.cc', 'heap/bitmap-unittest.cc',
'heap/concurrent-marking-deque-unittest.cc',
'heap/embedder-tracing-unittest.cc', 'heap/embedder-tracing-unittest.cc',
'heap/gc-idle-time-handler-unittest.cc', 'heap/gc-idle-time-handler-unittest.cc',
'heap/gc-tracer-unittest.cc', 'heap/gc-tracer-unittest.cc',