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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 "include/cppgc/allocation.h"
#include "src/heap/cppgc/marker.h"
#include "src/heap/cppgc/marking-visitor.h"
#include "src/heap/cppgc/stats-collector.h"
#include "test/unittests/heap/cppgc/tests.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace cppgc {
namespace internal {
namespace {
class WeakContainerTest : public testing::TestWithHeap {
public:
using Config = Marker::MarkingConfig;
void StartMarking() {
Config config = {Config::CollectionType::kMajor,
Config::StackState::kNoHeapPointers,
Config::MarkingType::kIncremental};
GetMarkerRef() = MarkerFactory::CreateAndStartMarking<Marker>(
Heap::From(GetHeap())->AsBase(), GetPlatformHandle().get(), config);
}
void FinishMarking(Config::StackState stack_state) {
GetMarkerRef()->FinishMarking(stack_state);
GetMarkerRef().reset();
Heap::From(GetHeap())->stats_collector()->NotifySweepingCompleted();
}
};
class TraceableGCed : public GarbageCollected<TraceableGCed> {
public:
void Trace(cppgc::Visitor*) const { n_trace_calls++; }
static size_t n_trace_calls;
};
size_t TraceableGCed::n_trace_calls = 0u;
class NonTraceableGCed : public GarbageCollected<NonTraceableGCed> {
public:
void Trace(cppgc::Visitor*) const { n_trace_calls++; }
static size_t n_trace_calls;
};
size_t NonTraceableGCed::n_trace_calls = 0u;
void EmptyWeakCallback(const LivenessBroker&, const void*) {}
template <typename T>
V8_NOINLINE T access(volatile const T& t) {
return t;
}
} // namespace
} // namespace internal
template <>
struct TraceTrait<internal::TraceableGCed>
: public internal::TraceTraitBase<internal::TraceableGCed> {
static TraceDescriptor GetWeakTraceDescriptor(const void* self) {
return {self, Trace};
}
};
template <>
struct TraceTrait<internal::NonTraceableGCed>
: public internal::TraceTraitBase<internal::NonTraceableGCed> {
static TraceDescriptor GetWeakTraceDescriptor(const void* self) {
return {self, nullptr};
}
};
namespace internal {
TEST_F(WeakContainerTest, TraceableGCedTraced) {
TraceableGCed* obj =
MakeGarbageCollected<TraceableGCed>(GetAllocationHandle());
TraceableGCed::n_trace_calls = 0u;
StartMarking();
GetMarkerRef()->Visitor().TraceWeakContainer(obj, EmptyWeakCallback, nullptr);
FinishMarking(Config::StackState::kNoHeapPointers);
EXPECT_NE(0u, TraceableGCed::n_trace_calls);
access(obj);
}
TEST_F(WeakContainerTest, NonTraceableGCedNotTraced) {
NonTraceableGCed* obj =
MakeGarbageCollected<NonTraceableGCed>(GetAllocationHandle());
NonTraceableGCed::n_trace_calls = 0u;
StartMarking();
GetMarkerRef()->Visitor().TraceWeakContainer(obj, EmptyWeakCallback, nullptr);
FinishMarking(Config::StackState::kNoHeapPointers);
EXPECT_EQ(0u, NonTraceableGCed::n_trace_calls);
access(obj);
}
TEST_F(WeakContainerTest, NonTraceableGCedNotTracedConservatively) {
NonTraceableGCed* obj =
MakeGarbageCollected<NonTraceableGCed>(GetAllocationHandle());
NonTraceableGCed::n_trace_calls = 0u;
StartMarking();
GetMarkerRef()->Visitor().TraceWeakContainer(obj, EmptyWeakCallback, nullptr);
FinishMarking(Config::StackState::kMayContainHeapPointers);
EXPECT_NE(0u, NonTraceableGCed::n_trace_calls);
access(obj);
}
TEST_F(WeakContainerTest, ConservativeGCTracesWeakContainer) {
size_t trace_count_without_conservative;
{
TraceableGCed* obj =
MakeGarbageCollected<TraceableGCed>(GetAllocationHandle());
TraceableGCed::n_trace_calls = 0u;
StartMarking();
GetMarkerRef()->Visitor().TraceWeakContainer(obj, EmptyWeakCallback,
nullptr);
FinishMarking(Config::StackState::kNoHeapPointers);
trace_count_without_conservative = TraceableGCed::n_trace_calls;
access(obj);
}
{
TraceableGCed* obj =
MakeGarbageCollected<TraceableGCed>(GetAllocationHandle());
TraceableGCed::n_trace_calls = 0u;
StartMarking();
GetMarkerRef()->Visitor().TraceWeakContainer(obj, EmptyWeakCallback,
nullptr);
FinishMarking(Config::StackState::kMayContainHeapPointers);
EXPECT_LT(trace_count_without_conservative, TraceableGCed::n_trace_calls);
access(obj);
}
}
TEST_F(WeakContainerTest, ConservativeGCTracesWeakContainerOnce) {
NonTraceableGCed* obj =
MakeGarbageCollected<NonTraceableGCed>(GetAllocationHandle());
NonTraceableGCed* copy_obj = obj;
USE(copy_obj);
NonTraceableGCed* another_copy_obj = obj;
USE(another_copy_obj);
NonTraceableGCed::n_trace_calls = 0u;
StartMarking();
GetMarkerRef()->Visitor().TraceWeakContainer(obj, EmptyWeakCallback, nullptr);
FinishMarking(Config::StackState::kMayContainHeapPointers);
EXPECT_EQ(1u, NonTraceableGCed::n_trace_calls);
access(obj);
}
namespace {
struct WeakCallback {
static void callback(const LivenessBroker&, const void* data) {
n_callback_called++;
obj = data;
}
static size_t n_callback_called;
static const void* obj;
};
size_t WeakCallback::n_callback_called = 0u;
const void* WeakCallback::obj = nullptr;
} // namespace
TEST_F(WeakContainerTest, WeakContainerWeakCallbackCalled) {
TraceableGCed* obj =
MakeGarbageCollected<TraceableGCed>(GetAllocationHandle());
WeakCallback::n_callback_called = 0u;
WeakCallback::obj = nullptr;
StartMarking();
GetMarkerRef()->Visitor().TraceWeakContainer(obj, WeakCallback::callback,
obj);
FinishMarking(Config::StackState::kMayContainHeapPointers);
EXPECT_NE(0u, WeakCallback::n_callback_called);
EXPECT_EQ(obj, WeakCallback::obj);
}
} // namespace internal
} // namespace cppgc
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