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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/heap-object-header.h"
#include <atomic>
#include <memory>
#include "include/cppgc/allocation.h"
#include "src/base/atomic-utils.h"
#include "src/base/macros.h"
#include "src/base/platform/platform.h"
#include "src/heap/cppgc/globals.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace cppgc {
namespace internal {
TEST(HeapObjectHeaderTest, Constructor) {
constexpr GCInfoIndex kGCInfoIndex = 17;
constexpr size_t kSize = kAllocationGranularity;
HeapObjectHeader header(kSize, kGCInfoIndex);
EXPECT_EQ(kSize, header.AllocatedSize());
EXPECT_EQ(kGCInfoIndex, header.GetGCInfoIndex());
EXPECT_TRUE(header.IsInConstruction());
EXPECT_FALSE(header.IsMarked());
}
TEST(HeapObjectHeaderTest, Payload) {
constexpr GCInfoIndex kGCInfoIndex = 17;
constexpr size_t kSize = kAllocationGranularity;
HeapObjectHeader header(kSize, kGCInfoIndex);
EXPECT_EQ(reinterpret_cast<ConstAddress>(&header) + sizeof(HeapObjectHeader),
header.ObjectStart());
}
TEST(HeapObjectHeaderTest, PayloadEnd) {
constexpr GCInfoIndex kGCInfoIndex = 17;
constexpr size_t kSize = kAllocationGranularity;
HeapObjectHeader header(kSize, kGCInfoIndex);
EXPECT_EQ(reinterpret_cast<ConstAddress>(&header) + kSize,
header.ObjectEnd());
}
TEST(HeapObjectHeaderTest, GetGCInfoIndex) {
constexpr GCInfoIndex kGCInfoIndex = 17;
constexpr size_t kSize = kAllocationGranularity;
HeapObjectHeader header(kSize, kGCInfoIndex);
EXPECT_EQ(kGCInfoIndex, header.GetGCInfoIndex());
EXPECT_EQ(kGCInfoIndex, header.GetGCInfoIndex<AccessMode::kAtomic>());
}
TEST(HeapObjectHeaderTest, AllocatedSize) {
constexpr GCInfoIndex kGCInfoIndex = 17;
constexpr size_t kSize = kAllocationGranularity * 23;
HeapObjectHeader header(kSize, kGCInfoIndex);
EXPECT_EQ(kSize, header.AllocatedSize());
EXPECT_EQ(kSize, header.AllocatedSize<AccessMode::kAtomic>());
}
TEST(HeapObjectHeaderTest, IsLargeObject) {
constexpr GCInfoIndex kGCInfoIndex = 17;
constexpr size_t kSize = kAllocationGranularity * 23;
HeapObjectHeader header(kSize, kGCInfoIndex);
EXPECT_EQ(false, header.IsLargeObject());
EXPECT_EQ(false, header.IsLargeObject<AccessMode::kAtomic>());
HeapObjectHeader large_header(0, kGCInfoIndex + 1);
EXPECT_EQ(true, large_header.IsLargeObject());
EXPECT_EQ(true, large_header.IsLargeObject<AccessMode::kAtomic>());
}
TEST(HeapObjectHeaderTest, MarkObjectAsFullyConstructed) {
constexpr GCInfoIndex kGCInfoIndex = 17;
constexpr size_t kSize = kAllocationGranularity;
HeapObjectHeader header(kSize, kGCInfoIndex);
EXPECT_TRUE(header.IsInConstruction());
header.MarkAsFullyConstructed();
EXPECT_FALSE(header.IsInConstruction());
// Size shares the same bitfield and should be unaffected by
// MarkObjectAsFullyConstructed.
EXPECT_EQ(kSize, header.AllocatedSize());
}
TEST(HeapObjectHeaderTest, TryMark) {
constexpr GCInfoIndex kGCInfoIndex = 17;
constexpr size_t kSize = kAllocationGranularity * 7;
HeapObjectHeader header(kSize, kGCInfoIndex);
EXPECT_FALSE(header.IsMarked());
EXPECT_TRUE(header.TryMarkAtomic());
// GCInfoIndex shares the same bitfield and should be unaffected by
// TryMarkAtomic.
EXPECT_EQ(kGCInfoIndex, header.GetGCInfoIndex());
EXPECT_FALSE(header.TryMarkAtomic());
// GCInfoIndex shares the same bitfield and should be unaffected by
// TryMarkAtomic.
EXPECT_EQ(kGCInfoIndex, header.GetGCInfoIndex());
EXPECT_TRUE(header.IsMarked());
}
TEST(HeapObjectHeaderTest, Unmark) {
constexpr GCInfoIndex kGCInfoIndex = 17;
constexpr size_t kSize = kAllocationGranularity * 7;
HeapObjectHeader header(kSize, kGCInfoIndex);
EXPECT_FALSE(header.IsMarked());
EXPECT_TRUE(header.TryMarkAtomic());
EXPECT_EQ(kGCInfoIndex, header.GetGCInfoIndex());
EXPECT_TRUE(header.IsMarked());
header.Unmark();
// GCInfoIndex shares the same bitfield and should be unaffected by Unmark.
EXPECT_EQ(kGCInfoIndex, header.GetGCInfoIndex());
EXPECT_FALSE(header.IsMarked());
HeapObjectHeader header2(kSize, kGCInfoIndex);
EXPECT_FALSE(header2.IsMarked());
EXPECT_TRUE(header2.TryMarkAtomic());
EXPECT_TRUE(header2.IsMarked());
header2.Unmark<AccessMode::kAtomic>();
// GCInfoIndex shares the same bitfield and should be unaffected by Unmark.
EXPECT_EQ(kGCInfoIndex, header2.GetGCInfoIndex());
EXPECT_FALSE(header2.IsMarked());
}
namespace {
struct Payload {
volatile size_t value{5};
};
class ConcurrentGCThread final : public v8::base::Thread {
public:
explicit ConcurrentGCThread(HeapObjectHeader* header, Payload* payload)
: v8::base::Thread(Options("Thread accessing object.")),
header_(header),
payload_(payload) {}
void Run() final {
while (header_->IsInConstruction<AccessMode::kAtomic>()) {
}
USE(v8::base::AsAtomicPtr(const_cast<size_t*>(&payload_->value))
->load(std::memory_order_relaxed));
}
private:
HeapObjectHeader* header_;
Payload* payload_;
};
} // namespace
TEST(HeapObjectHeaderTest, ConstructionBitProtectsNonAtomicWrites) {
// Object publishing: Test checks that non-atomic stores in the payload can be
// guarded using MarkObjectAsFullyConstructed/IsInConstruction. The test
// relies on TSAN to find data races.
constexpr size_t kSize =
(sizeof(HeapObjectHeader) + sizeof(Payload) + kAllocationMask) &
~kAllocationMask;
typename std::aligned_storage<kSize, kAllocationGranularity>::type data;
HeapObjectHeader* header = new (&data) HeapObjectHeader(kSize, 1);
ConcurrentGCThread gc_thread(
header, reinterpret_cast<Payload*>(header->ObjectStart()));
CHECK(gc_thread.Start());
new (header->ObjectStart()) Payload();
header->MarkAsFullyConstructed();
gc_thread.Join();
}
#ifdef DEBUG
TEST(HeapObjectHeaderDeathTest, ConstructorTooLargeSize) {
constexpr GCInfoIndex kGCInfoIndex = 17;
constexpr size_t kSize = HeapObjectHeader::kMaxSize + 1;
EXPECT_DEATH_IF_SUPPORTED(HeapObjectHeader header(kSize, kGCInfoIndex), "");
}
TEST(HeapObjectHeaderDeathTest, ConstructorTooLargeGCInfoIndex) {
constexpr GCInfoIndex kGCInfoIndex = GCInfoTable::kMaxIndex + 1;
constexpr size_t kSize = kAllocationGranularity;
EXPECT_DEATH_IF_SUPPORTED(HeapObjectHeader header(kSize, kGCInfoIndex), "");
}
#endif // DEBUG
} // namespace internal
} // namespace cppgc
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