libartbase/base/bit_vector_test.cc - LeafOS-Project/android_art - Gitiles

 /*
  * Copyright (C) 2013 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include <memory>
 #include <random>

 #include "allocator.h"
 #include "base/stl_util.h"
 #include "bit_vector-inl.h"
 #include "gtest/gtest.h"
 #include "transform_iterator.h"

 namespace art {

 TEST(BitVector, Test) {
   const size_t kBits = 32;

   BitVector bv(kBits, false, Allocator::GetMallocAllocator());
   EXPECT_EQ(1U, bv.GetStorageSize());
   EXPECT_EQ(sizeof(uint32_t), bv.GetSizeOf());
   EXPECT_FALSE(bv.IsExpandable());

   EXPECT_EQ(0U, bv.NumSetBits());
   EXPECT_EQ(0U, bv.NumSetBits(1));
   EXPECT_EQ(0U, bv.NumSetBits(kBits));
   for (size_t i = 0; i < kBits; i++) {
     EXPECT_FALSE(bv.IsBitSet(i));
   }
   EXPECT_EQ(0U, bv.GetRawStorageWord(0));
   EXPECT_EQ(0U, *bv.GetRawStorage());

   EXPECT_TRUE(bv.Indexes().begin().Done());
   EXPECT_TRUE(bv.Indexes().begin() == bv.Indexes().end());

   bv.SetBit(0);
   bv.SetBit(kBits - 1);
   EXPECT_EQ(2U, bv.NumSetBits());
   EXPECT_EQ(1U, bv.NumSetBits(1));
   EXPECT_EQ(2U, bv.NumSetBits(kBits));
   EXPECT_TRUE(bv.IsBitSet(0));
   for (size_t i = 1; i < kBits - 1; i++) {
     EXPECT_FALSE(bv.IsBitSet(i));
   }
   EXPECT_TRUE(bv.IsBitSet(kBits - 1));
   EXPECT_EQ(0x80000001U, bv.GetRawStorageWord(0));
   EXPECT_EQ(0x80000001U, *bv.GetRawStorage());

   BitVector::IndexIterator iterator = bv.Indexes().begin();
   EXPECT_TRUE(iterator != bv.Indexes().end());
   EXPECT_EQ(0u, *iterator);
   ++iterator;
   EXPECT_TRUE(iterator != bv.Indexes().end());
   EXPECT_EQ(kBits - 1u, *iterator);
   ++iterator;
   EXPECT_TRUE(iterator == bv.Indexes().end());
 }

 struct MessyAllocator : public Allocator {
  public:
   MessyAllocator() : malloc_(Allocator::GetMallocAllocator()) {}
   ~MessyAllocator() {}

   void* Alloc(size_t s) override {
     void* res = malloc_->Alloc(s);
     memset(res, 0xfe, s);
     return res;
   }

   void Free(void* v) override {
     malloc_->Free(v);
   }

  private:
   Allocator* malloc_;
 };

 TEST(BitVector, MessyAllocator) {
   MessyAllocator alloc;
   BitVector bv(32, false, &alloc);
   EXPECT_EQ(bv.NumSetBits(), 0u);
   EXPECT_EQ(bv.GetHighestBitSet(), -1);
 }

 TEST(BitVector, NoopAllocator) {
   const uint32_t kWords = 2;

   uint32_t bits[kWords];
   memset(bits, 0, sizeof(bits));

   BitVector bv(false, Allocator::GetNoopAllocator(), kWords, bits);
   EXPECT_EQ(kWords, bv.GetStorageSize());
   EXPECT_EQ(kWords * sizeof(uint32_t), bv.GetSizeOf());
   EXPECT_EQ(bits, bv.GetRawStorage());
   EXPECT_EQ(0U, bv.NumSetBits());

   bv.SetBit(8);
   EXPECT_EQ(1U, bv.NumSetBits());
   EXPECT_EQ(0x00000100U, bv.GetRawStorageWord(0));
   EXPECT_EQ(0x00000000U, bv.GetRawStorageWord(1));
   EXPECT_EQ(1U, bv.NumSetBits());

   bv.SetBit(16);
   EXPECT_EQ(2U, bv.NumSetBits());
   EXPECT_EQ(0x00010100U, bv.GetRawStorageWord(0));
   EXPECT_EQ(0x00000000U, bv.GetRawStorageWord(1));
   EXPECT_EQ(2U, bv.NumSetBits());

   bv.SetBit(32);
   EXPECT_EQ(3U, bv.NumSetBits());
   EXPECT_EQ(0x00010100U, bv.GetRawStorageWord(0));
   EXPECT_EQ(0x00000001U, bv.GetRawStorageWord(1));
   EXPECT_EQ(3U, bv.NumSetBits());

   bv.SetBit(48);
   EXPECT_EQ(4U, bv.NumSetBits());
   EXPECT_EQ(0x00010100U, bv.GetRawStorageWord(0));
   EXPECT_EQ(0x00010001U, bv.GetRawStorageWord(1));
   EXPECT_EQ(4U, bv.NumSetBits());

   EXPECT_EQ(0U, bv.NumSetBits(1));

   EXPECT_EQ(0U, bv.NumSetBits(8));
   EXPECT_EQ(1U, bv.NumSetBits(9));
   EXPECT_EQ(1U, bv.NumSetBits(10));

   EXPECT_EQ(1U, bv.NumSetBits(16));
   EXPECT_EQ(2U, bv.NumSetBits(17));
   EXPECT_EQ(2U, bv.NumSetBits(18));

   EXPECT_EQ(2U, bv.NumSetBits(32));
   EXPECT_EQ(3U, bv.NumSetBits(33));
   EXPECT_EQ(3U, bv.NumSetBits(34));

   EXPECT_EQ(3U, bv.NumSetBits(48));
   EXPECT_EQ(4U, bv.NumSetBits(49));
   EXPECT_EQ(4U, bv.NumSetBits(50));

   EXPECT_EQ(4U, bv.NumSetBits(64));
 }

 TEST(BitVector, SetInitialBits) {
   const uint32_t kWords = 2;

   uint32_t bits[kWords];
   memset(bits, 0, sizeof(bits));

   BitVector bv(false, Allocator::GetNoopAllocator(), kWords, bits);
   bv.SetInitialBits(0u);
   EXPECT_EQ(0u, bv.NumSetBits());
   bv.SetInitialBits(1u);
   EXPECT_EQ(1u, bv.NumSetBits());
   bv.SetInitialBits(32u);
   EXPECT_EQ(32u, bv.NumSetBits());
   bv.SetInitialBits(63u);
   EXPECT_EQ(63u, bv.NumSetBits());
   bv.SetInitialBits(64u);
   EXPECT_EQ(64u, bv.NumSetBits());
 }

 TEST(BitVector, UnionIfNotIn) {
   {
     BitVector first(2, true, Allocator::GetMallocAllocator());
     BitVector second(5, true, Allocator::GetMallocAllocator());
     BitVector third(5, true, Allocator::GetMallocAllocator());

     second.SetBit(64);
     third.SetBit(64);
     bool changed = first.UnionIfNotIn(&second, &third);
     EXPECT_EQ(0u, first.NumSetBits());
     EXPECT_FALSE(changed);
   }

   {
     BitVector first(2, true, Allocator::GetMallocAllocator());
     BitVector second(5, true, Allocator::GetMallocAllocator());
     BitVector third(5, true, Allocator::GetMallocAllocator());

     second.SetBit(64);
     bool changed = first.UnionIfNotIn(&second, &third);
     EXPECT_EQ(1u, first.NumSetBits());
     EXPECT_TRUE(changed);
     EXPECT_TRUE(first.IsBitSet(64));
   }
 }

 TEST(BitVector, Subset) {
   {
     BitVector first(2, true, Allocator::GetMallocAllocator());
     BitVector second(5, true, Allocator::GetMallocAllocator());

     EXPECT_TRUE(first.IsSubsetOf(&second));
     second.SetBit(4);
     EXPECT_TRUE(first.IsSubsetOf(&second));
   }

   {
     BitVector first(5, true, Allocator::GetMallocAllocator());
     BitVector second(5, true, Allocator::GetMallocAllocator());

     first.SetBit(5);
     EXPECT_FALSE(first.IsSubsetOf(&second));
     second.SetBit(4);
     EXPECT_FALSE(first.IsSubsetOf(&second));
   }

   {
     BitVector first(5, true, Allocator::GetMallocAllocator());
     BitVector second(5, true, Allocator::GetMallocAllocator());

     first.SetBit(16);
     first.SetBit(32);
     first.SetBit(48);
     second.SetBit(16);
     second.SetBit(32);
     second.SetBit(48);

     EXPECT_TRUE(first.IsSubsetOf(&second));
     second.SetBit(8);
     EXPECT_TRUE(first.IsSubsetOf(&second));
     second.SetBit(40);
     EXPECT_TRUE(first.IsSubsetOf(&second));
     second.SetBit(52);
     EXPECT_TRUE(first.IsSubsetOf(&second));

     first.SetBit(9);
     EXPECT_FALSE(first.IsSubsetOf(&second));
   }
 }

 TEST(BitVector, CopyTo) {
   {
     // Test copying an empty BitVector. Padding should fill `buf` with zeroes.
     BitVector bv(0, true, Allocator::GetMallocAllocator());
     uint32_t buf;

     bv.CopyTo(&buf, sizeof(buf));
     EXPECT_EQ(0u, bv.GetSizeOf());
     EXPECT_EQ(0u, buf);
   }

   {
     // Test copying when `bv.storage_` and `buf` are of equal lengths.
     BitVector bv(0, true, Allocator::GetMallocAllocator());
     uint32_t buf;

     bv.SetBit(0);
     bv.SetBit(17);
     bv.SetBit(26);
     EXPECT_EQ(sizeof(buf), bv.GetSizeOf());

     bv.CopyTo(&buf, sizeof(buf));
     EXPECT_EQ(0x04020001u, buf);
   }

   {
     // Test copying when the `bv.storage_` is longer than `buf`. As long as
     // `buf` is long enough to hold all set bits, copying should succeed.
     BitVector bv(0, true, Allocator::GetMallocAllocator());
     uint8_t buf[5];

     bv.SetBit(18);
     bv.SetBit(39);
     EXPECT_LT(sizeof(buf), bv.GetSizeOf());

     bv.CopyTo(buf, sizeof(buf));
     EXPECT_EQ(0x00u, buf[0]);
     EXPECT_EQ(0x00u, buf[1]);
     EXPECT_EQ(0x04u, buf[2]);
     EXPECT_EQ(0x00u, buf[3]);
     EXPECT_EQ(0x80u, buf[4]);
   }

   {
     // Test zero padding when `bv.storage_` is shorter than `buf`.
     BitVector bv(0, true, Allocator::GetMallocAllocator());
     uint32_t buf[2];

     bv.SetBit(18);
     bv.SetBit(31);
     EXPECT_GT(sizeof(buf), bv.GetSizeOf());

     bv.CopyTo(buf, sizeof(buf));
     EXPECT_EQ(0x80040000U, buf[0]);
     EXPECT_EQ(0x00000000U, buf[1]);
   }
 }

 TEST(BitVector, TransformIterator) {
   BitVector bv(16, false, Allocator::GetMallocAllocator());
   bv.SetBit(4);
   bv.SetBit(8);

   auto indexs = bv.Indexes();
   for (int32_t negative :
        MakeTransformRange(indexs, [](uint32_t idx) { return -1 * static_cast<int32_t>(idx); })) {
     EXPECT_TRUE(negative == -4 || negative == -8);
   }
 }

 class SingleAllocator : public Allocator {
  public:
   SingleAllocator() : alloc_count_(0), free_count_(0) {}
   ~SingleAllocator() {
     EXPECT_EQ(alloc_count_, 1u);
     EXPECT_EQ(free_count_, 1u);
   }

   void* Alloc(size_t s) override {
     EXPECT_LT(s, 1024ull);
     EXPECT_EQ(alloc_count_, free_count_);
     ++alloc_count_;
     return bytes_.begin();
   }

   void Free(void*) override {
     ++free_count_;
   }

   uint32_t AllocCount() const {
     return alloc_count_;
   }
   uint32_t FreeCount() const {
     return free_count_;
   }

  private:
   std::array<uint8_t, 1024> bytes_;
   uint32_t alloc_count_;
   uint32_t free_count_;
 };

 TEST(BitVector, MovementFree) {
   SingleAllocator alloc;
   {
     BitVector bv(16, false, &alloc);
     bv.SetBit(13);
     EXPECT_EQ(alloc.FreeCount(), 0u);
     EXPECT_EQ(alloc.AllocCount(), 1u);
     ASSERT_TRUE(bv.GetRawStorage() != nullptr);
     EXPECT_TRUE(bv.IsBitSet(13));
     {
       BitVector bv2(std::move(bv));
       ASSERT_TRUE(bv.GetRawStorage() == nullptr);
       EXPECT_TRUE(bv2.IsBitSet(13));
       EXPECT_EQ(alloc.FreeCount(), 0u);
       EXPECT_EQ(alloc.AllocCount(), 1u);
     }
     EXPECT_EQ(alloc.FreeCount(), 1u);
     EXPECT_EQ(alloc.AllocCount(), 1u);
   }
   EXPECT_EQ(alloc.FreeCount(), 1u);
   EXPECT_EQ(alloc.AllocCount(), 1u);
 }

 TEST(BitVector, ArrayCol) {
   {
     BitVectorArray bva(100, 200, true, Allocator::GetMallocAllocator());
     for (uint32_t i : Range(bva.NumColumns())) {
       bva.SetBit(bva.NumRows() / 2, i);
     }
     EXPECT_EQ(bva.GetRawData().NumSetBits(), bva.NumColumns());
   }
   {
     BitVectorArray bva(100, 200, true, Allocator::GetMallocAllocator());
     for (uint32_t i : Range(bva.NumRows())) {
       bva.SetBit(i, bva.NumColumns() / 2);
     }
     EXPECT_EQ(bva.GetRawData().NumSetBits(), bva.NumRows());
   }
 }

 TEST(BitVector, ArrayUnion) {
   {
     BitVectorArray bva(100, 200, true, Allocator::GetMallocAllocator());
     bva.SetBit(4, 12);
     bva.SetBit(40, 120);
     bva.SetBit(40, 121);
     bva.SetBit(40, 122);

     bva.UnionRows(4, 40);

     EXPECT_TRUE(bva.IsBitSet(4, 12));
     EXPECT_TRUE(bva.IsBitSet(4, 120));
     EXPECT_TRUE(bva.IsBitSet(4, 121));
     EXPECT_TRUE(bva.IsBitSet(4, 122));
     EXPECT_FALSE(bva.IsBitSet(40, 12));
     EXPECT_TRUE(bva.IsBitSet(40, 120));
     EXPECT_TRUE(bva.IsBitSet(40, 121));
     EXPECT_TRUE(bva.IsBitSet(40, 122));
     EXPECT_EQ(bva.GetRawData().NumSetBits(), 7u);
   }
   {
     BitVectorArray bva(100, 100, true, Allocator::GetMallocAllocator());
     for (uint32_t i : Range(bva.NumRows())) {
       bva.SetBit(i, i);
     }
     for (uint32_t i : Range(1, bva.NumRows())) {
       bva.UnionRows(0, i);
     }
     for (uint32_t col : Range(bva.NumColumns())) {
       for (uint32_t row : Range(bva.NumRows())) {
         // We set every bit where row== column and every bit on row 0 up to number of rows.
         EXPECT_EQ(bva.IsBitSet(row, col), row == col || (row == 0 && col < bva.NumRows()));
       }
     }
   }
 }

 }  // namespace art
	/*
	* Copyright (C) 2013 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include <memory>
	#include <random>

	#include "allocator.h"
	#include "base/stl_util.h"
	#include "bit_vector-inl.h"
	#include "gtest/gtest.h"
	#include "transform_iterator.h"

	namespace art {

	TEST(BitVector, Test) {
	const size_t kBits = 32;

	BitVector bv(kBits, false, Allocator::GetMallocAllocator());
	EXPECT_EQ(1U, bv.GetStorageSize());
	EXPECT_EQ(sizeof(uint32_t), bv.GetSizeOf());
	EXPECT_FALSE(bv.IsExpandable());

	EXPECT_EQ(0U, bv.NumSetBits());
	EXPECT_EQ(0U, bv.NumSetBits(1));
	EXPECT_EQ(0U, bv.NumSetBits(kBits));
	for (size_t i = 0; i < kBits; i++) {
	EXPECT_FALSE(bv.IsBitSet(i));
	}
	EXPECT_EQ(0U, bv.GetRawStorageWord(0));
	EXPECT_EQ(0U, *bv.GetRawStorage());

	EXPECT_TRUE(bv.Indexes().begin().Done());
	EXPECT_TRUE(bv.Indexes().begin() == bv.Indexes().end());

	bv.SetBit(0);
	bv.SetBit(kBits - 1);
	EXPECT_EQ(2U, bv.NumSetBits());
	EXPECT_EQ(1U, bv.NumSetBits(1));
	EXPECT_EQ(2U, bv.NumSetBits(kBits));
	EXPECT_TRUE(bv.IsBitSet(0));
	for (size_t i = 1; i < kBits - 1; i++) {
	EXPECT_FALSE(bv.IsBitSet(i));
	}
	EXPECT_TRUE(bv.IsBitSet(kBits - 1));
	EXPECT_EQ(0x80000001U, bv.GetRawStorageWord(0));
	EXPECT_EQ(0x80000001U, *bv.GetRawStorage());

	BitVector::IndexIterator iterator = bv.Indexes().begin();
	EXPECT_TRUE(iterator != bv.Indexes().end());
	EXPECT_EQ(0u, *iterator);
	++iterator;
	EXPECT_TRUE(iterator != bv.Indexes().end());
	EXPECT_EQ(kBits - 1u, *iterator);
	++iterator;
	EXPECT_TRUE(iterator == bv.Indexes().end());
	}

	struct MessyAllocator : public Allocator {
	public:
	MessyAllocator() : malloc_(Allocator::GetMallocAllocator()) {}
	~MessyAllocator() {}

	void* Alloc(size_t s) override {
	void* res = malloc_->Alloc(s);
	memset(res, 0xfe, s);
	return res;
	}

	void Free(void* v) override {
	malloc_->Free(v);
	}

	private:
	Allocator* malloc_;
	};

	TEST(BitVector, MessyAllocator) {
	MessyAllocator alloc;
	BitVector bv(32, false, &alloc);
	EXPECT_EQ(bv.NumSetBits(), 0u);
	EXPECT_EQ(bv.GetHighestBitSet(), -1);
	}

	TEST(BitVector, NoopAllocator) {
	const uint32_t kWords = 2;

	uint32_t bits[kWords];
	memset(bits, 0, sizeof(bits));

	BitVector bv(false, Allocator::GetNoopAllocator(), kWords, bits);
	EXPECT_EQ(kWords, bv.GetStorageSize());
	EXPECT_EQ(kWords * sizeof(uint32_t), bv.GetSizeOf());
	EXPECT_EQ(bits, bv.GetRawStorage());
	EXPECT_EQ(0U, bv.NumSetBits());

	bv.SetBit(8);
	EXPECT_EQ(1U, bv.NumSetBits());
	EXPECT_EQ(0x00000100U, bv.GetRawStorageWord(0));
	EXPECT_EQ(0x00000000U, bv.GetRawStorageWord(1));
	EXPECT_EQ(1U, bv.NumSetBits());

	bv.SetBit(16);
	EXPECT_EQ(2U, bv.NumSetBits());
	EXPECT_EQ(0x00010100U, bv.GetRawStorageWord(0));
	EXPECT_EQ(0x00000000U, bv.GetRawStorageWord(1));
	EXPECT_EQ(2U, bv.NumSetBits());

	bv.SetBit(32);
	EXPECT_EQ(3U, bv.NumSetBits());
	EXPECT_EQ(0x00010100U, bv.GetRawStorageWord(0));
	EXPECT_EQ(0x00000001U, bv.GetRawStorageWord(1));
	EXPECT_EQ(3U, bv.NumSetBits());

	bv.SetBit(48);
	EXPECT_EQ(4U, bv.NumSetBits());
	EXPECT_EQ(0x00010100U, bv.GetRawStorageWord(0));
	EXPECT_EQ(0x00010001U, bv.GetRawStorageWord(1));
	EXPECT_EQ(4U, bv.NumSetBits());

	EXPECT_EQ(0U, bv.NumSetBits(1));

	EXPECT_EQ(0U, bv.NumSetBits(8));
	EXPECT_EQ(1U, bv.NumSetBits(9));
	EXPECT_EQ(1U, bv.NumSetBits(10));

	EXPECT_EQ(1U, bv.NumSetBits(16));
	EXPECT_EQ(2U, bv.NumSetBits(17));
	EXPECT_EQ(2U, bv.NumSetBits(18));

	EXPECT_EQ(2U, bv.NumSetBits(32));
	EXPECT_EQ(3U, bv.NumSetBits(33));
	EXPECT_EQ(3U, bv.NumSetBits(34));

	EXPECT_EQ(3U, bv.NumSetBits(48));
	EXPECT_EQ(4U, bv.NumSetBits(49));
	EXPECT_EQ(4U, bv.NumSetBits(50));

	EXPECT_EQ(4U, bv.NumSetBits(64));
	}

	TEST(BitVector, SetInitialBits) {
	const uint32_t kWords = 2;

	uint32_t bits[kWords];
	memset(bits, 0, sizeof(bits));

	BitVector bv(false, Allocator::GetNoopAllocator(), kWords, bits);
	bv.SetInitialBits(0u);
	EXPECT_EQ(0u, bv.NumSetBits());
	bv.SetInitialBits(1u);
	EXPECT_EQ(1u, bv.NumSetBits());
	bv.SetInitialBits(32u);
	EXPECT_EQ(32u, bv.NumSetBits());
	bv.SetInitialBits(63u);
	EXPECT_EQ(63u, bv.NumSetBits());
	bv.SetInitialBits(64u);
	EXPECT_EQ(64u, bv.NumSetBits());
	}

	TEST(BitVector, UnionIfNotIn) {
	{
	BitVector first(2, true, Allocator::GetMallocAllocator());
	BitVector second(5, true, Allocator::GetMallocAllocator());
	BitVector third(5, true, Allocator::GetMallocAllocator());

	second.SetBit(64);
	third.SetBit(64);
	bool changed = first.UnionIfNotIn(&second, &third);
	EXPECT_EQ(0u, first.NumSetBits());
	EXPECT_FALSE(changed);
	}

	{
	BitVector first(2, true, Allocator::GetMallocAllocator());
	BitVector second(5, true, Allocator::GetMallocAllocator());
	BitVector third(5, true, Allocator::GetMallocAllocator());

	second.SetBit(64);
	bool changed = first.UnionIfNotIn(&second, &third);
	EXPECT_EQ(1u, first.NumSetBits());
	EXPECT_TRUE(changed);
	EXPECT_TRUE(first.IsBitSet(64));
	}
	}

	TEST(BitVector, Subset) {
	{
	BitVector first(2, true, Allocator::GetMallocAllocator());
	BitVector second(5, true, Allocator::GetMallocAllocator());

	EXPECT_TRUE(first.IsSubsetOf(&second));
	second.SetBit(4);
	EXPECT_TRUE(first.IsSubsetOf(&second));
	}

	{
	BitVector first(5, true, Allocator::GetMallocAllocator());
	BitVector second(5, true, Allocator::GetMallocAllocator());

	first.SetBit(5);
	EXPECT_FALSE(first.IsSubsetOf(&second));
	second.SetBit(4);
	EXPECT_FALSE(first.IsSubsetOf(&second));
	}

	{
	BitVector first(5, true, Allocator::GetMallocAllocator());
	BitVector second(5, true, Allocator::GetMallocAllocator());

	first.SetBit(16);
	first.SetBit(32);
	first.SetBit(48);
	second.SetBit(16);
	second.SetBit(32);
	second.SetBit(48);

	EXPECT_TRUE(first.IsSubsetOf(&second));
	second.SetBit(8);
	EXPECT_TRUE(first.IsSubsetOf(&second));
	second.SetBit(40);
	EXPECT_TRUE(first.IsSubsetOf(&second));
	second.SetBit(52);
	EXPECT_TRUE(first.IsSubsetOf(&second));

	first.SetBit(9);
	EXPECT_FALSE(first.IsSubsetOf(&second));
	}
	}

	TEST(BitVector, CopyTo) {
	{
	// Test copying an empty BitVector. Padding should fill `buf` with zeroes.
	BitVector bv(0, true, Allocator::GetMallocAllocator());
	uint32_t buf;

	bv.CopyTo(&buf, sizeof(buf));
	EXPECT_EQ(0u, bv.GetSizeOf());
	EXPECT_EQ(0u, buf);
	}

	{
	// Test copying when `bv.storage_` and `buf` are of equal lengths.
	BitVector bv(0, true, Allocator::GetMallocAllocator());
	uint32_t buf;

	bv.SetBit(0);
	bv.SetBit(17);
	bv.SetBit(26);
	EXPECT_EQ(sizeof(buf), bv.GetSizeOf());

	bv.CopyTo(&buf, sizeof(buf));
	EXPECT_EQ(0x04020001u, buf);
	}

	{
	// Test copying when the `bv.storage_` is longer than `buf`. As long as
	// `buf` is long enough to hold all set bits, copying should succeed.
	BitVector bv(0, true, Allocator::GetMallocAllocator());
	uint8_t buf[5];

	bv.SetBit(18);
	bv.SetBit(39);
	EXPECT_LT(sizeof(buf), bv.GetSizeOf());

	bv.CopyTo(buf, sizeof(buf));
	EXPECT_EQ(0x00u, buf[0]);
	EXPECT_EQ(0x00u, buf[1]);
	EXPECT_EQ(0x04u, buf[2]);
	EXPECT_EQ(0x00u, buf[3]);
	EXPECT_EQ(0x80u, buf[4]);
	}

	{
	// Test zero padding when `bv.storage_` is shorter than `buf`.
	BitVector bv(0, true, Allocator::GetMallocAllocator());
	uint32_t buf[2];

	bv.SetBit(18);
	bv.SetBit(31);
	EXPECT_GT(sizeof(buf), bv.GetSizeOf());

	bv.CopyTo(buf, sizeof(buf));
	EXPECT_EQ(0x80040000U, buf[0]);
	EXPECT_EQ(0x00000000U, buf[1]);
	}
	}

	TEST(BitVector, TransformIterator) {
	BitVector bv(16, false, Allocator::GetMallocAllocator());
	bv.SetBit(4);
	bv.SetBit(8);

	auto indexs = bv.Indexes();
	for (int32_t negative :
	MakeTransformRange(indexs, [](uint32_t idx) { return -1 * static_cast<int32_t>(idx); })) {
	EXPECT_TRUE(negative == -4 \|\| negative == -8);
	}
	}

	class SingleAllocator : public Allocator {
	public:
	SingleAllocator() : alloc_count_(0), free_count_(0) {}
	~SingleAllocator() {
	EXPECT_EQ(alloc_count_, 1u);
	EXPECT_EQ(free_count_, 1u);
	}

	void* Alloc(size_t s) override {
	EXPECT_LT(s, 1024ull);
	EXPECT_EQ(alloc_count_, free_count_);
	++alloc_count_;
	return bytes_.begin();
	}

	void Free(void*) override {
	++free_count_;
	}

	uint32_t AllocCount() const {
	return alloc_count_;
	}
	uint32_t FreeCount() const {
	return free_count_;
	}

	private:
	std::array<uint8_t, 1024> bytes_;
	uint32_t alloc_count_;
	uint32_t free_count_;
	};

	TEST(BitVector, MovementFree) {
	SingleAllocator alloc;
	{
	BitVector bv(16, false, &alloc);
	bv.SetBit(13);
	EXPECT_EQ(alloc.FreeCount(), 0u);
	EXPECT_EQ(alloc.AllocCount(), 1u);
	ASSERT_TRUE(bv.GetRawStorage() != nullptr);
	EXPECT_TRUE(bv.IsBitSet(13));
	{
	BitVector bv2(std::move(bv));
	ASSERT_TRUE(bv.GetRawStorage() == nullptr);
	EXPECT_TRUE(bv2.IsBitSet(13));
	EXPECT_EQ(alloc.FreeCount(), 0u);
	EXPECT_EQ(alloc.AllocCount(), 1u);
	}
	EXPECT_EQ(alloc.FreeCount(), 1u);
	EXPECT_EQ(alloc.AllocCount(), 1u);
	}
	EXPECT_EQ(alloc.FreeCount(), 1u);
	EXPECT_EQ(alloc.AllocCount(), 1u);
	}

	TEST(BitVector, ArrayCol) {
	{
	BitVectorArray bva(100, 200, true, Allocator::GetMallocAllocator());
	for (uint32_t i : Range(bva.NumColumns())) {
	bva.SetBit(bva.NumRows() / 2, i);
	}
	EXPECT_EQ(bva.GetRawData().NumSetBits(), bva.NumColumns());
	}
	{
	BitVectorArray bva(100, 200, true, Allocator::GetMallocAllocator());
	for (uint32_t i : Range(bva.NumRows())) {
	bva.SetBit(i, bva.NumColumns() / 2);
	}
	EXPECT_EQ(bva.GetRawData().NumSetBits(), bva.NumRows());
	}
	}

	TEST(BitVector, ArrayUnion) {
	{
	BitVectorArray bva(100, 200, true, Allocator::GetMallocAllocator());
	bva.SetBit(4, 12);
	bva.SetBit(40, 120);
	bva.SetBit(40, 121);
	bva.SetBit(40, 122);

	bva.UnionRows(4, 40);

	EXPECT_TRUE(bva.IsBitSet(4, 12));
	EXPECT_TRUE(bva.IsBitSet(4, 120));
	EXPECT_TRUE(bva.IsBitSet(4, 121));
	EXPECT_TRUE(bva.IsBitSet(4, 122));
	EXPECT_FALSE(bva.IsBitSet(40, 12));
	EXPECT_TRUE(bva.IsBitSet(40, 120));
	EXPECT_TRUE(bva.IsBitSet(40, 121));
	EXPECT_TRUE(bva.IsBitSet(40, 122));
	EXPECT_EQ(bva.GetRawData().NumSetBits(), 7u);
	}
	{
	BitVectorArray bva(100, 100, true, Allocator::GetMallocAllocator());
	for (uint32_t i : Range(bva.NumRows())) {
	bva.SetBit(i, i);
	}
	for (uint32_t i : Range(1, bva.NumRows())) {
	bva.UnionRows(0, i);
	}
	for (uint32_t col : Range(bva.NumColumns())) {
	for (uint32_t row : Range(bva.NumRows())) {
	// We set every bit where row== column and every bit on row 0 up to number of rows.
	EXPECT_EQ(bva.IsBitSet(row, col), row == col \|\| (row == 0 && col < bva.NumRows()));
	}
	}
	}
	}

	} // namespace art