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// Copyright 2020 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/cppgc/marker.h"
#include "include/cppgc/allocation.h"
#include "include/cppgc/member.h"
#include "include/cppgc/persistent.h"
#include "src/heap/cppgc/heap-object-header-inl.h"
#include "test/unittests/heap/cppgc/tests.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace cppgc {
namespace internal {
namespace {
class MarkerTest : public testing::TestWithHeap {
public:
using MarkingConfig = Marker::MarkingConfig;
void DoMarking(MarkingConfig config) {
Marker marker(Heap::From(GetHeap()));
marker.StartMarking(config);
marker.FinishMarking();
marker.ProcessWeakness();
}
};
class GCed : public GarbageCollected<GCed> {
public:
void SetChild(GCed* child) { child_ = child; }
void SetWeakChild(GCed* child) { weak_child_ = child; }
GCed* child() const { return child_.Get(); }
GCed* weak_child() const { return weak_child_.Get(); }
void Trace(cppgc::Visitor* visitor) const {
visitor->Trace(child_);
visitor->Trace(weak_child_);
}
private:
Member<GCed> child_;
WeakMember<GCed> weak_child_;
};
template <typename T>
V8_NOINLINE T access(volatile const T& t) {
return t;
}
} // namespace
TEST_F(MarkerTest, PersistentIsMarked) {
Persistent<GCed> object = MakeGarbageCollected<GCed>(GetHeap());
HeapObjectHeader& header = HeapObjectHeader::FromPayload(object);
EXPECT_FALSE(header.IsMarked());
DoMarking(MarkingConfig(MarkingConfig::StackState::kNoHeapPointers));
EXPECT_TRUE(header.IsMarked());
}
TEST_F(MarkerTest, ReachableMemberIsMarked) {
Persistent<GCed> parent = MakeGarbageCollected<GCed>(GetHeap());
parent->SetChild(MakeGarbageCollected<GCed>(GetHeap()));
HeapObjectHeader& header = HeapObjectHeader::FromPayload(parent->child());
EXPECT_FALSE(header.IsMarked());
DoMarking(MarkingConfig(MarkingConfig::StackState::kNoHeapPointers));
EXPECT_TRUE(header.IsMarked());
}
TEST_F(MarkerTest, UnreachableMemberIsNotMarked) {
Member<GCed> object = MakeGarbageCollected<GCed>(GetHeap());
HeapObjectHeader& header = HeapObjectHeader::FromPayload(object);
EXPECT_FALSE(header.IsMarked());
DoMarking(MarkingConfig(MarkingConfig::StackState::kNoHeapPointers));
EXPECT_FALSE(header.IsMarked());
}
TEST_F(MarkerTest, ObjectReachableFromStackIsMarked) {
GCed* object = MakeGarbageCollected<GCed>(GetHeap());
EXPECT_FALSE(HeapObjectHeader::FromPayload(object).IsMarked());
DoMarking(MarkingConfig(MarkingConfig::StackState::kMayContainHeapPointers));
EXPECT_TRUE(HeapObjectHeader::FromPayload(object).IsMarked());
access(object);
}
TEST_F(MarkerTest, ObjectReachableOnlyFromStackIsNotMarkedIfStackIsEmpty) {
GCed* object = MakeGarbageCollected<GCed>(GetHeap());
HeapObjectHeader& header = HeapObjectHeader::FromPayload(object);
EXPECT_FALSE(header.IsMarked());
DoMarking(MarkingConfig(MarkingConfig::StackState::kNoHeapPointers));
EXPECT_FALSE(header.IsMarked());
access(object);
}
TEST_F(MarkerTest, WeakReferenceToUnreachableObjectIsCleared) {
{
WeakPersistent<GCed> weak_object = MakeGarbageCollected<GCed>(GetHeap());
EXPECT_TRUE(weak_object);
DoMarking(MarkingConfig(MarkingConfig::StackState::kNoHeapPointers));
EXPECT_FALSE(weak_object);
}
{
Persistent<GCed> parent = MakeGarbageCollected<GCed>(GetHeap());
parent->SetWeakChild(MakeGarbageCollected<GCed>(GetHeap()));
EXPECT_TRUE(parent->weak_child());
DoMarking(MarkingConfig(MarkingConfig::StackState::kNoHeapPointers));
EXPECT_FALSE(parent->weak_child());
}
}
TEST_F(MarkerTest, WeakReferenceToReachableObjectIsNotCleared) {
// Reachable from Persistent
{
Persistent<GCed> object = MakeGarbageCollected<GCed>(GetHeap());
WeakPersistent<GCed> weak_object(object);
EXPECT_TRUE(weak_object);
DoMarking(MarkingConfig(MarkingConfig::StackState::kNoHeapPointers));
EXPECT_TRUE(weak_object);
}
{
Persistent<GCed> object = MakeGarbageCollected<GCed>(GetHeap());
Persistent<GCed> parent = MakeGarbageCollected<GCed>(GetHeap());
parent->SetWeakChild(object);
EXPECT_TRUE(parent->weak_child());
DoMarking(MarkingConfig(MarkingConfig::StackState::kNoHeapPointers));
EXPECT_TRUE(parent->weak_child());
}
// Reachable from Member
{
Persistent<GCed> parent = MakeGarbageCollected<GCed>(GetHeap());
WeakPersistent<GCed> weak_object(MakeGarbageCollected<GCed>(GetHeap()));
parent->SetChild(weak_object);
EXPECT_TRUE(weak_object);
DoMarking(MarkingConfig(MarkingConfig::StackState::kNoHeapPointers));
EXPECT_TRUE(weak_object);
}
{
Persistent<GCed> parent = MakeGarbageCollected<GCed>(GetHeap());
parent->SetChild(MakeGarbageCollected<GCed>(GetHeap()));
parent->SetWeakChild(parent->child());
EXPECT_TRUE(parent->weak_child());
DoMarking(MarkingConfig(MarkingConfig::StackState::kNoHeapPointers));
EXPECT_TRUE(parent->weak_child());
}
// Reachable from stack
{
GCed* object = MakeGarbageCollected<GCed>(GetHeap());
WeakPersistent<GCed> weak_object(object);
EXPECT_TRUE(weak_object);
DoMarking(
MarkingConfig(MarkingConfig::StackState::kMayContainHeapPointers));
EXPECT_TRUE(weak_object);
access(object);
}
{
GCed* object = MakeGarbageCollected<GCed>(GetHeap());
Persistent<GCed> parent = MakeGarbageCollected<GCed>(GetHeap());
parent->SetWeakChild(object);
EXPECT_TRUE(parent->weak_child());
DoMarking(
MarkingConfig(MarkingConfig::StackState::kMayContainHeapPointers));
EXPECT_TRUE(parent->weak_child());
access(object);
}
}
TEST_F(MarkerTest, DeepHierarchyIsMarked) {
static constexpr int kHierarchyDepth = 10;
Persistent<GCed> root = MakeGarbageCollected<GCed>(GetHeap());
GCed* parent = root;
for (int i = 0; i < kHierarchyDepth; ++i) {
parent->SetChild(MakeGarbageCollected<GCed>(GetHeap()));
parent->SetWeakChild(parent->child());
parent = parent->child();
}
DoMarking(MarkingConfig(MarkingConfig::StackState::kNoHeapPointers));
EXPECT_TRUE(HeapObjectHeader::FromPayload(root).IsMarked());
parent = root;
for (int i = 0; i < kHierarchyDepth; ++i) {
EXPECT_TRUE(HeapObjectHeader::FromPayload(parent->child()).IsMarked());
EXPECT_TRUE(parent->weak_child());
parent = parent->child();
}
}
} // namespace internal
} // namespace cppgc
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