gpu/command_buffer/client/fenced_allocator_test.cc - chromium/src - Git at Google

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 // This file contains the tests for the FencedAllocator class.

 #include <stdint.h>

 #include <memory>

 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/aligned_memory.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "gpu/command_buffer/client/cmd_buffer_helper.h"
 #include "gpu/command_buffer/client/fenced_allocator.h"
 #include "gpu/command_buffer/service/command_buffer_direct.h"
 #include "gpu/command_buffer/service/mocks.h"
 #include "testing/gtest/include/gtest/gtest.h"

 namespace gpu {

 using testing::Return;
 using testing::Mock;
 using testing::Truly;
 using testing::Sequence;
 using testing::DoAll;
 using testing::Invoke;
 using testing::InvokeWithoutArgs;
 using testing::_;

 class BaseFencedAllocatorTest : public testing::Test {
  protected:
   static const unsigned int kBufferSize = 1024;
   static const int kAllocAlignment = 16;

   void SetUp() override {
     command_buffer_.reset(new CommandBufferDirect());
     api_mock_.reset(new AsyncAPIMock(true, command_buffer_->service()));
     command_buffer_->set_handler(api_mock_.get());

     // ignore noops in the mock - we don't want to inspect the internals of the
     // helper.
     EXPECT_CALL(*api_mock_, DoCommand(cmd::kNoop, 0, _))
         .WillRepeatedly(Return(error::kNoError));
     // Forward the SetToken calls to the engine
     EXPECT_CALL(*api_mock_.get(), DoCommand(cmd::kSetToken, 1, _))
         .WillRepeatedly(DoAll(Invoke(api_mock_.get(), &AsyncAPIMock::SetToken),
                               Return(error::kNoError)));

     helper_.reset(new CommandBufferHelper(command_buffer_.get()));
     helper_->Initialize(kBufferSize);
   }

   int32_t GetToken() { return command_buffer_->GetLastState().token; }

   std::unique_ptr<CommandBufferDirect> command_buffer_;
   std::unique_ptr<AsyncAPIMock> api_mock_;
   std::unique_ptr<CommandBufferHelper> helper_;
   base::MessageLoop message_loop_;
 };

 #ifndef _MSC_VER
 const unsigned int BaseFencedAllocatorTest::kBufferSize;
 #endif

 // Test fixture for FencedAllocator test - Creates a FencedAllocator, using a
 // CommandBufferHelper with a mock AsyncAPIInterface for its interface (calling
 // it directly, not through the RPC mechanism), making sure Noops are ignored
 // and SetToken are properly forwarded to the engine.
 class FencedAllocatorTest : public BaseFencedAllocatorTest {
  protected:
   void SetUp() override {
     BaseFencedAllocatorTest::SetUp();
     allocator_.reset(new FencedAllocator(kBufferSize, helper_.get()));
   }

   void TearDown() override {
     // If the CommandExecutor posts any tasks, this forces them to run.
     base::RunLoop().RunUntilIdle();

     EXPECT_TRUE(allocator_->CheckConsistency());

     BaseFencedAllocatorTest::TearDown();
   }

   std::unique_ptr<FencedAllocator> allocator_;
 };

 // Checks basic alloc and free.
 TEST_F(FencedAllocatorTest, TestBasic) {
   allocator_->CheckConsistency();
   EXPECT_FALSE(allocator_->InUseOrFreePending());

   const unsigned int kSize = 16;
   FencedAllocator::Offset offset = allocator_->Alloc(kSize);
   EXPECT_TRUE(allocator_->InUseOrFreePending());
   EXPECT_NE(FencedAllocator::kInvalidOffset, offset);
   EXPECT_GE(kBufferSize, offset+kSize);
   EXPECT_TRUE(allocator_->CheckConsistency());

   allocator_->Free(offset);
   EXPECT_FALSE(allocator_->InUseOrFreePending());
   EXPECT_TRUE(allocator_->CheckConsistency());
 }

 // Test alloc 0 fails.
 TEST_F(FencedAllocatorTest, TestAllocZero) {
   FencedAllocator::Offset offset = allocator_->Alloc(0);
   EXPECT_EQ(FencedAllocator::kInvalidOffset, offset);
   EXPECT_FALSE(allocator_->InUseOrFreePending());
   EXPECT_TRUE(allocator_->CheckConsistency());
 }

 // Checks out-of-memory condition.
 TEST_F(FencedAllocatorTest, TestOutOfMemory) {
   EXPECT_TRUE(allocator_->CheckConsistency());

   const unsigned int kSize = 16;
   const unsigned int kAllocCount = kBufferSize / kSize;
   CHECK(kAllocCount * kSize == kBufferSize);

   // Allocate several buffers to fill in the memory.
   FencedAllocator::Offset offsets[kAllocCount];
   for (unsigned int i = 0; i < kAllocCount; ++i) {
     offsets[i] = allocator_->Alloc(kSize);
     EXPECT_NE(FencedAllocator::kInvalidOffset, offsets[i]);
     EXPECT_GE(kBufferSize, offsets[i]+kSize);
     EXPECT_TRUE(allocator_->CheckConsistency());
   }

   // This allocation should fail.
   FencedAllocator::Offset offset_failed = allocator_->Alloc(kSize);
   EXPECT_EQ(FencedAllocator::kInvalidOffset, offset_failed);
   EXPECT_TRUE(allocator_->CheckConsistency());

   // Free one successful allocation, reallocate with half the size
   allocator_->Free(offsets[0]);
   EXPECT_TRUE(allocator_->CheckConsistency());
   offsets[0] = allocator_->Alloc(kSize/2);
   EXPECT_NE(FencedAllocator::kInvalidOffset, offsets[0]);
   EXPECT_GE(kBufferSize, offsets[0]+kSize);
   EXPECT_TRUE(allocator_->CheckConsistency());

   // This allocation should fail as well.
   offset_failed = allocator_->Alloc(kSize);
   EXPECT_EQ(FencedAllocator::kInvalidOffset, offset_failed);
   EXPECT_TRUE(allocator_->CheckConsistency());

   // Free up everything.
   for (unsigned int i = 0; i < kAllocCount; ++i) {
     allocator_->Free(offsets[i]);
     EXPECT_TRUE(allocator_->CheckConsistency());
   }
 }

 // Checks the free-pending-token mechanism.
 TEST_F(FencedAllocatorTest, TestFreePendingToken) {
   EXPECT_TRUE(allocator_->CheckConsistency());

   const unsigned int kSize = 16;
   const unsigned int kAllocCount = kBufferSize / kSize;
   CHECK(kAllocCount * kSize == kBufferSize);

   // Allocate several buffers to fill in the memory.
   FencedAllocator::Offset offsets[kAllocCount];
   for (unsigned int i = 0; i < kAllocCount; ++i) {
     offsets[i] = allocator_->Alloc(kSize);
     EXPECT_NE(FencedAllocator::kInvalidOffset, offsets[i]);
     EXPECT_GE(kBufferSize, offsets[i]+kSize);
     EXPECT_TRUE(allocator_->CheckConsistency());
   }

   // This allocation should fail.
   FencedAllocator::Offset offset_failed = allocator_->Alloc(kSize);
   EXPECT_EQ(FencedAllocator::kInvalidOffset, offset_failed);
   EXPECT_TRUE(allocator_->CheckConsistency());

   // Free one successful allocation, pending fence.
   int32_t token = helper_.get()->InsertToken();
   allocator_->FreePendingToken(offsets[0], token);
   EXPECT_TRUE(allocator_->CheckConsistency());

   // The way we hooked up the helper and engine, it won't process commands
   // until it has to wait for something. Which means the token shouldn't have
   // passed yet at this point.
   EXPECT_GT(token, GetToken());

   // This allocation will need to reclaim the space freed above, so that should
   // process the commands until the token is passed.
   offsets[0] = allocator_->Alloc(kSize);
   EXPECT_NE(FencedAllocator::kInvalidOffset, offsets[0]);
   EXPECT_GE(kBufferSize, offsets[0]+kSize);
   EXPECT_TRUE(allocator_->CheckConsistency());
   // Check that the token has indeed passed.
   EXPECT_LE(token, GetToken());

   // Free up everything.
   for (unsigned int i = 0; i < kAllocCount; ++i) {
     allocator_->Free(offsets[i]);
     EXPECT_TRUE(allocator_->CheckConsistency());
   }
 }

 // Checks the free-pending-token mechanism using FreeUnused
 TEST_F(FencedAllocatorTest, FreeUnused) {
   EXPECT_TRUE(allocator_->CheckConsistency());

   const unsigned int kSize = 16;
   const unsigned int kAllocCount = kBufferSize / kSize;
   CHECK(kAllocCount * kSize == kBufferSize);

   // Allocate several buffers to fill in the memory.
   FencedAllocator::Offset offsets[kAllocCount];
   for (unsigned int i = 0; i < kAllocCount; ++i) {
     offsets[i] = allocator_->Alloc(kSize);
     EXPECT_NE(FencedAllocator::kInvalidOffset, offsets[i]);
     EXPECT_GE(kBufferSize, offsets[i]+kSize);
     EXPECT_TRUE(allocator_->CheckConsistency());
   }
   EXPECT_TRUE(allocator_->InUseOrFreePending());

   // No memory should be available.
   EXPECT_EQ(0u, allocator_->GetLargestFreeSize());

   // Free one successful allocation, pending fence.
   int32_t token = helper_.get()->InsertToken();
   allocator_->FreePendingToken(offsets[0], token);
   EXPECT_TRUE(allocator_->CheckConsistency());

   // Force the command buffer to process the token.
   helper_->Finish();

   // Tell the allocator to update what's available based on the current token.
   allocator_->FreeUnused();

   // Check that the new largest free size takes into account the unused block.
   EXPECT_EQ(kSize, allocator_->GetLargestFreeSize());

   // Free two more.
   token = helper_.get()->InsertToken();
   allocator_->FreePendingToken(offsets[1], token);
   token = helper_.get()->InsertToken();
   allocator_->FreePendingToken(offsets[2], token);
   EXPECT_TRUE(allocator_->CheckConsistency());

   // Check that nothing has changed.
   EXPECT_EQ(kSize, allocator_->GetLargestFreeSize());

   // Force the command buffer to process the token.
   helper_->Finish();

   // Tell the allocator to update what's available based on the current token.
   allocator_->FreeUnused();

   // Check that the new largest free size takes into account the unused blocks.
   EXPECT_EQ(kSize * 3, allocator_->GetLargestFreeSize());
   EXPECT_TRUE(allocator_->InUseOrFreePending());

   // Free up everything.
   for (unsigned int i = 3; i < kAllocCount; ++i) {
     allocator_->Free(offsets[i]);
     EXPECT_TRUE(allocator_->CheckConsistency());
   }
   EXPECT_FALSE(allocator_->InUseOrFreePending());
 }

 // Tests GetLargestFreeSize
 TEST_F(FencedAllocatorTest, TestGetLargestFreeSize) {
   EXPECT_TRUE(allocator_->CheckConsistency());
   EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeSize());

   FencedAllocator::Offset offset = allocator_->Alloc(kBufferSize);
   ASSERT_NE(FencedAllocator::kInvalidOffset, offset);
   EXPECT_EQ(0u, allocator_->GetLargestFreeSize());
   allocator_->Free(offset);
   EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeSize());

   const unsigned int kSize = 16;
   offset = allocator_->Alloc(kSize);
   ASSERT_NE(FencedAllocator::kInvalidOffset, offset);
   // The following checks that the buffer is allocated "smartly" - which is
   // dependent on the implementation. But both first-fit or best-fit would
   // ensure that.
   EXPECT_EQ(kBufferSize - kSize, allocator_->GetLargestFreeSize());

   // Allocate 2 more buffers (now 3), and then free the first two. This is to
   // ensure a hole. Note that this is dependent on the first-fit current
   // implementation.
   FencedAllocator::Offset offset1 = allocator_->Alloc(kSize);
   ASSERT_NE(FencedAllocator::kInvalidOffset, offset1);
   FencedAllocator::Offset offset2 = allocator_->Alloc(kSize);
   ASSERT_NE(FencedAllocator::kInvalidOffset, offset2);
   allocator_->Free(offset);
   allocator_->Free(offset1);
   EXPECT_EQ(kBufferSize - 3 * kSize, allocator_->GetLargestFreeSize());

   offset = allocator_->Alloc(kBufferSize - 3 * kSize);
   ASSERT_NE(FencedAllocator::kInvalidOffset, offset);
   EXPECT_EQ(2 * kSize, allocator_->GetLargestFreeSize());

   offset1 = allocator_->Alloc(2 * kSize);
   ASSERT_NE(FencedAllocator::kInvalidOffset, offset1);
   EXPECT_EQ(0u, allocator_->GetLargestFreeSize());

   allocator_->Free(offset);
   allocator_->Free(offset1);
   allocator_->Free(offset2);
 }

 // Tests GetLargestFreeOrPendingSize
 TEST_F(FencedAllocatorTest, TestGetLargestFreeOrPendingSize) {
   EXPECT_TRUE(allocator_->CheckConsistency());
   EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeOrPendingSize());

   FencedAllocator::Offset offset = allocator_->Alloc(kBufferSize);
   ASSERT_NE(FencedAllocator::kInvalidOffset, offset);
   EXPECT_EQ(0u, allocator_->GetLargestFreeOrPendingSize());
   allocator_->Free(offset);
   EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeOrPendingSize());

   const unsigned int kSize = 16;
   offset = allocator_->Alloc(kSize);
   ASSERT_NE(FencedAllocator::kInvalidOffset, offset);
   // The following checks that the buffer is allocates "smartly" - which is
   // dependent on the implementation. But both first-fit or best-fit would
   // ensure that.
   EXPECT_EQ(kBufferSize - kSize, allocator_->GetLargestFreeOrPendingSize());

   // Allocate 2 more buffers (now 3), and then free the first two. This is to
   // ensure a hole. Note that this is dependent on the first-fit current
   // implementation.
   FencedAllocator::Offset offset1 = allocator_->Alloc(kSize);
   ASSERT_NE(FencedAllocator::kInvalidOffset, offset1);
   FencedAllocator::Offset offset2 = allocator_->Alloc(kSize);
   ASSERT_NE(FencedAllocator::kInvalidOffset, offset2);
   allocator_->Free(offset);
   allocator_->Free(offset1);
   EXPECT_EQ(kBufferSize - 3 * kSize,
             allocator_->GetLargestFreeOrPendingSize());

   // Free the last one, pending a token.
   int32_t token = helper_.get()->InsertToken();
   allocator_->FreePendingToken(offset2, token);

   // Now all the buffers have been freed...
   EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeOrPendingSize());
   // .. but one is still waiting for the token.
   EXPECT_EQ(kBufferSize - 3 * kSize,
             allocator_->GetLargestFreeSize());

   // The way we hooked up the helper and engine, it won't process commands
   // until it has to wait for something. Which means the token shouldn't have
   // passed yet at this point.
   EXPECT_GT(token, GetToken());
   // This allocation will need to reclaim the space freed above, so that should
   // process the commands until the token is passed, but it will succeed.
   offset = allocator_->Alloc(kBufferSize);
   ASSERT_NE(FencedAllocator::kInvalidOffset, offset);
   // Check that the token has indeed passed.
   EXPECT_LE(token, GetToken());
   allocator_->Free(offset);

   // Everything now has been freed...
   EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeOrPendingSize());
   // ... for real.
   EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeSize());
 }

 // Test fixture for FencedAllocatorWrapper test - Creates a
 // FencedAllocatorWrapper, using a CommandBufferHelper with a mock
 // AsyncAPIInterface for its interface (calling it directly, not through the
 // RPC mechanism), making sure Noops are ignored and SetToken are properly
 // forwarded to the engine.
 class FencedAllocatorWrapperTest : public BaseFencedAllocatorTest {
  protected:
   void SetUp() override {
     BaseFencedAllocatorTest::SetUp();

     // Though allocating this buffer isn't strictly necessary, it makes
     // allocations point to valid addresses, so they could be used for
     // something.
     buffer_.reset(static_cast<char*>(base::AlignedAlloc(
         kBufferSize, kAllocAlignment)));
     allocator_.reset(new FencedAllocatorWrapper(kBufferSize,
                                                 helper_.get(),
                                                 buffer_.get()));
   }

   void TearDown() override {
     // If the CommandExecutor posts any tasks, this forces them to run.
     base::RunLoop().RunUntilIdle();

     EXPECT_TRUE(allocator_->CheckConsistency());

     BaseFencedAllocatorTest::TearDown();
   }

   std::unique_ptr<FencedAllocatorWrapper> allocator_;
   std::unique_ptr<char, base::AlignedFreeDeleter> buffer_;
 };

 // Checks basic alloc and free.
 TEST_F(FencedAllocatorWrapperTest, TestBasic) {
   allocator_->CheckConsistency();

   const unsigned int kSize = 16;
   void *pointer = allocator_->Alloc(kSize);
   ASSERT_TRUE(pointer);
   EXPECT_LE(buffer_.get(), static_cast<char *>(pointer));
   EXPECT_GE(kBufferSize, static_cast<char *>(pointer) - buffer_.get() + kSize);
   EXPECT_TRUE(allocator_->CheckConsistency());

   allocator_->Free(pointer);
   EXPECT_TRUE(allocator_->CheckConsistency());

   char *pointer_char = allocator_->AllocTyped<char>(kSize);
   ASSERT_TRUE(pointer_char);
   EXPECT_LE(buffer_.get(), pointer_char);
   EXPECT_GE(buffer_.get() + kBufferSize, pointer_char + kSize);
   allocator_->Free(pointer_char);
   EXPECT_TRUE(allocator_->CheckConsistency());

   unsigned int *pointer_uint = allocator_->AllocTyped<unsigned int>(kSize);
   ASSERT_TRUE(pointer_uint);
   EXPECT_LE(buffer_.get(), reinterpret_cast<char *>(pointer_uint));
   EXPECT_GE(buffer_.get() + kBufferSize,
             reinterpret_cast<char *>(pointer_uint + kSize));

   // Check that it did allocate kSize * sizeof(unsigned int). We can't tell
   // directly, except from the remaining size.
   EXPECT_EQ(kBufferSize - kSize * sizeof(*pointer_uint),
             allocator_->GetLargestFreeSize());
   allocator_->Free(pointer_uint);
 }

 // Test alloc 0 fails.
 TEST_F(FencedAllocatorWrapperTest, TestAllocZero) {
   allocator_->CheckConsistency();

   void *pointer = allocator_->Alloc(0);
   ASSERT_FALSE(pointer);
   EXPECT_TRUE(allocator_->CheckConsistency());
 }

 // Checks that allocation offsets are aligned to multiples of 16 bytes.
 TEST_F(FencedAllocatorWrapperTest, TestAlignment) {
   allocator_->CheckConsistency();

   const unsigned int kSize1 = 75;
   void *pointer1 = allocator_->Alloc(kSize1);
   ASSERT_TRUE(pointer1);
   EXPECT_EQ(reinterpret_cast<intptr_t>(pointer1) & (kAllocAlignment - 1), 0);
   EXPECT_TRUE(allocator_->CheckConsistency());

   const unsigned int kSize2 = 43;
   void *pointer2 = allocator_->Alloc(kSize2);
   ASSERT_TRUE(pointer2);
   EXPECT_EQ(reinterpret_cast<intptr_t>(pointer2) & (kAllocAlignment - 1), 0);
   EXPECT_TRUE(allocator_->CheckConsistency());

   allocator_->Free(pointer2);
   EXPECT_TRUE(allocator_->CheckConsistency());

   allocator_->Free(pointer1);
   EXPECT_TRUE(allocator_->CheckConsistency());
 }

 // Checks out-of-memory condition.
 TEST_F(FencedAllocatorWrapperTest, TestOutOfMemory) {
   allocator_->CheckConsistency();

   const unsigned int kSize = 16;
   const unsigned int kAllocCount = kBufferSize / kSize;
   CHECK(kAllocCount * kSize == kBufferSize);

   // Allocate several buffers to fill in the memory.
   void *pointers[kAllocCount];
   for (unsigned int i = 0; i < kAllocCount; ++i) {
     pointers[i] = allocator_->Alloc(kSize);
     EXPECT_TRUE(pointers[i]);
     EXPECT_TRUE(allocator_->CheckConsistency());
   }

   // This allocation should fail.
   void *pointer_failed = allocator_->Alloc(kSize);
   EXPECT_FALSE(pointer_failed);
   EXPECT_TRUE(allocator_->CheckConsistency());

   // Free one successful allocation, reallocate with half the size
   allocator_->Free(pointers[0]);
   EXPECT_TRUE(allocator_->CheckConsistency());
   pointers[0] = allocator_->Alloc(kSize/2);
   EXPECT_TRUE(pointers[0]);
   EXPECT_TRUE(allocator_->CheckConsistency());

   // This allocation should fail as well.
   pointer_failed = allocator_->Alloc(kSize);
   EXPECT_FALSE(pointer_failed);
   EXPECT_TRUE(allocator_->CheckConsistency());

   // Free up everything.
   for (unsigned int i = 0; i < kAllocCount; ++i) {
     allocator_->Free(pointers[i]);
     EXPECT_TRUE(allocator_->CheckConsistency());
   }
 }

 // Checks the free-pending-token mechanism.
 TEST_F(FencedAllocatorWrapperTest, TestFreePendingToken) {
   allocator_->CheckConsistency();

   const unsigned int kSize = 16;
   const unsigned int kAllocCount = kBufferSize / kSize;
   CHECK(kAllocCount * kSize == kBufferSize);

   // Allocate several buffers to fill in the memory.
   void *pointers[kAllocCount];
   for (unsigned int i = 0; i < kAllocCount; ++i) {
     pointers[i] = allocator_->Alloc(kSize);
     EXPECT_TRUE(pointers[i]);
     EXPECT_TRUE(allocator_->CheckConsistency());
   }

   // This allocation should fail.
   void *pointer_failed = allocator_->Alloc(kSize);
   EXPECT_FALSE(pointer_failed);
   EXPECT_TRUE(allocator_->CheckConsistency());

   // Free one successful allocation, pending fence.
   int32_t token = helper_.get()->InsertToken();
   allocator_->FreePendingToken(pointers[0], token);
   EXPECT_TRUE(allocator_->CheckConsistency());

   // The way we hooked up the helper and engine, it won't process commands
   // until it has to wait for something. Which means the token shouldn't have
   // passed yet at this point.
   EXPECT_GT(token, GetToken());

   // This allocation will need to reclaim the space freed above, so that should
   // process the commands until the token is passed.
   pointers[0] = allocator_->Alloc(kSize);
   EXPECT_TRUE(pointers[0]);
   EXPECT_TRUE(allocator_->CheckConsistency());
   // Check that the token has indeed passed.
   EXPECT_LE(token, GetToken());

   // Free up everything.
   for (unsigned int i = 0; i < kAllocCount; ++i) {
     allocator_->Free(pointers[i]);
     EXPECT_TRUE(allocator_->CheckConsistency());
   }
 }

 }  // namespace gpu
	// Copyright (c) 2012 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	// This file contains the tests for the FencedAllocator class.

	#include <stdint.h>

	#include <memory>

	#include "base/bind.h"
	#include "base/bind_helpers.h"
	#include "base/memory/aligned_memory.h"
	#include "base/message_loop/message_loop.h"
	#include "base/run_loop.h"
	#include "gpu/command_buffer/client/cmd_buffer_helper.h"
	#include "gpu/command_buffer/client/fenced_allocator.h"
	#include "gpu/command_buffer/service/command_buffer_direct.h"
	#include "gpu/command_buffer/service/mocks.h"
	#include "testing/gtest/include/gtest/gtest.h"

	namespace gpu {

	using testing::Return;
	using testing::Mock;
	using testing::Truly;
	using testing::Sequence;
	using testing::DoAll;
	using testing::Invoke;
	using testing::InvokeWithoutArgs;
	using testing::_;

	class BaseFencedAllocatorTest : public testing::Test {
	protected:
	static const unsigned int kBufferSize = 1024;
	static const int kAllocAlignment = 16;

	void SetUp() override {
	command_buffer_.reset(new CommandBufferDirect());
	api_mock_.reset(new AsyncAPIMock(true, command_buffer_->service()));
	command_buffer_->set_handler(api_mock_.get());

	// ignore noops in the mock - we don't want to inspect the internals of the
	// helper.
	EXPECT_CALL(*api_mock_, DoCommand(cmd::kNoop, 0, _))
	.WillRepeatedly(Return(error::kNoError));
	// Forward the SetToken calls to the engine
	EXPECT_CALL(*api_mock_.get(), DoCommand(cmd::kSetToken, 1, _))
	.WillRepeatedly(DoAll(Invoke(api_mock_.get(), &AsyncAPIMock::SetToken),
	Return(error::kNoError)));

	helper_.reset(new CommandBufferHelper(command_buffer_.get()));
	helper_->Initialize(kBufferSize);
	}

	int32_t GetToken() { return command_buffer_->GetLastState().token; }

	std::unique_ptr<CommandBufferDirect> command_buffer_;
	std::unique_ptr<AsyncAPIMock> api_mock_;
	std::unique_ptr<CommandBufferHelper> helper_;
	base::MessageLoop message_loop_;
	};

	#ifndef _MSC_VER
	const unsigned int BaseFencedAllocatorTest::kBufferSize;
	#endif

	// Test fixture for FencedAllocator test - Creates a FencedAllocator, using a
	// CommandBufferHelper with a mock AsyncAPIInterface for its interface (calling
	// it directly, not through the RPC mechanism), making sure Noops are ignored
	// and SetToken are properly forwarded to the engine.
	class FencedAllocatorTest : public BaseFencedAllocatorTest {
	protected:
	void SetUp() override {
	BaseFencedAllocatorTest::SetUp();
	allocator_.reset(new FencedAllocator(kBufferSize, helper_.get()));
	}

	void TearDown() override {
	// If the CommandExecutor posts any tasks, this forces them to run.
	base::RunLoop().RunUntilIdle();

	EXPECT_TRUE(allocator_->CheckConsistency());

	BaseFencedAllocatorTest::TearDown();
	}

	std::unique_ptr<FencedAllocator> allocator_;
	};

	// Checks basic alloc and free.
	TEST_F(FencedAllocatorTest, TestBasic) {
	allocator_->CheckConsistency();
	EXPECT_FALSE(allocator_->InUseOrFreePending());

	const unsigned int kSize = 16;
	FencedAllocator::Offset offset = allocator_->Alloc(kSize);
	EXPECT_TRUE(allocator_->InUseOrFreePending());
	EXPECT_NE(FencedAllocator::kInvalidOffset, offset);
	EXPECT_GE(kBufferSize, offset+kSize);
	EXPECT_TRUE(allocator_->CheckConsistency());

	allocator_->Free(offset);
	EXPECT_FALSE(allocator_->InUseOrFreePending());
	EXPECT_TRUE(allocator_->CheckConsistency());
	}

	// Test alloc 0 fails.
	TEST_F(FencedAllocatorTest, TestAllocZero) {
	FencedAllocator::Offset offset = allocator_->Alloc(0);
	EXPECT_EQ(FencedAllocator::kInvalidOffset, offset);
	EXPECT_FALSE(allocator_->InUseOrFreePending());
	EXPECT_TRUE(allocator_->CheckConsistency());
	}

	// Checks out-of-memory condition.
	TEST_F(FencedAllocatorTest, TestOutOfMemory) {
	EXPECT_TRUE(allocator_->CheckConsistency());

	const unsigned int kSize = 16;
	const unsigned int kAllocCount = kBufferSize / kSize;
	CHECK(kAllocCount * kSize == kBufferSize);

	// Allocate several buffers to fill in the memory.
	FencedAllocator::Offset offsets[kAllocCount];
	for (unsigned int i = 0; i < kAllocCount; ++i) {
	offsets[i] = allocator_->Alloc(kSize);
	EXPECT_NE(FencedAllocator::kInvalidOffset, offsets[i]);
	EXPECT_GE(kBufferSize, offsets[i]+kSize);
	EXPECT_TRUE(allocator_->CheckConsistency());
	}

	// This allocation should fail.
	FencedAllocator::Offset offset_failed = allocator_->Alloc(kSize);
	EXPECT_EQ(FencedAllocator::kInvalidOffset, offset_failed);
	EXPECT_TRUE(allocator_->CheckConsistency());

	// Free one successful allocation, reallocate with half the size
	allocator_->Free(offsets[0]);
	EXPECT_TRUE(allocator_->CheckConsistency());
	offsets[0] = allocator_->Alloc(kSize/2);
	EXPECT_NE(FencedAllocator::kInvalidOffset, offsets[0]);
	EXPECT_GE(kBufferSize, offsets[0]+kSize);
	EXPECT_TRUE(allocator_->CheckConsistency());

	// This allocation should fail as well.
	offset_failed = allocator_->Alloc(kSize);
	EXPECT_EQ(FencedAllocator::kInvalidOffset, offset_failed);
	EXPECT_TRUE(allocator_->CheckConsistency());

	// Free up everything.
	for (unsigned int i = 0; i < kAllocCount; ++i) {
	allocator_->Free(offsets[i]);
	EXPECT_TRUE(allocator_->CheckConsistency());
	}
	}

	// Checks the free-pending-token mechanism.
	TEST_F(FencedAllocatorTest, TestFreePendingToken) {
	EXPECT_TRUE(allocator_->CheckConsistency());

	const unsigned int kSize = 16;
	const unsigned int kAllocCount = kBufferSize / kSize;
	CHECK(kAllocCount * kSize == kBufferSize);

	// Allocate several buffers to fill in the memory.
	FencedAllocator::Offset offsets[kAllocCount];
	for (unsigned int i = 0; i < kAllocCount; ++i) {
	offsets[i] = allocator_->Alloc(kSize);
	EXPECT_NE(FencedAllocator::kInvalidOffset, offsets[i]);
	EXPECT_GE(kBufferSize, offsets[i]+kSize);
	EXPECT_TRUE(allocator_->CheckConsistency());
	}

	// This allocation should fail.
	FencedAllocator::Offset offset_failed = allocator_->Alloc(kSize);
	EXPECT_EQ(FencedAllocator::kInvalidOffset, offset_failed);
	EXPECT_TRUE(allocator_->CheckConsistency());

	// Free one successful allocation, pending fence.
	int32_t token = helper_.get()->InsertToken();
	allocator_->FreePendingToken(offsets[0], token);
	EXPECT_TRUE(allocator_->CheckConsistency());

	// The way we hooked up the helper and engine, it won't process commands
	// until it has to wait for something. Which means the token shouldn't have
	// passed yet at this point.
	EXPECT_GT(token, GetToken());

	// This allocation will need to reclaim the space freed above, so that should
	// process the commands until the token is passed.
	offsets[0] = allocator_->Alloc(kSize);
	EXPECT_NE(FencedAllocator::kInvalidOffset, offsets[0]);
	EXPECT_GE(kBufferSize, offsets[0]+kSize);
	EXPECT_TRUE(allocator_->CheckConsistency());
	// Check that the token has indeed passed.
	EXPECT_LE(token, GetToken());

	// Free up everything.
	for (unsigned int i = 0; i < kAllocCount; ++i) {
	allocator_->Free(offsets[i]);
	EXPECT_TRUE(allocator_->CheckConsistency());
	}
	}

	// Checks the free-pending-token mechanism using FreeUnused
	TEST_F(FencedAllocatorTest, FreeUnused) {
	EXPECT_TRUE(allocator_->CheckConsistency());

	const unsigned int kSize = 16;
	const unsigned int kAllocCount = kBufferSize / kSize;
	CHECK(kAllocCount * kSize == kBufferSize);

	// Allocate several buffers to fill in the memory.
	FencedAllocator::Offset offsets[kAllocCount];
	for (unsigned int i = 0; i < kAllocCount; ++i) {
	offsets[i] = allocator_->Alloc(kSize);
	EXPECT_NE(FencedAllocator::kInvalidOffset, offsets[i]);
	EXPECT_GE(kBufferSize, offsets[i]+kSize);
	EXPECT_TRUE(allocator_->CheckConsistency());
	}
	EXPECT_TRUE(allocator_->InUseOrFreePending());

	// No memory should be available.
	EXPECT_EQ(0u, allocator_->GetLargestFreeSize());

	// Free one successful allocation, pending fence.
	int32_t token = helper_.get()->InsertToken();
	allocator_->FreePendingToken(offsets[0], token);
	EXPECT_TRUE(allocator_->CheckConsistency());

	// Force the command buffer to process the token.
	helper_->Finish();

	// Tell the allocator to update what's available based on the current token.
	allocator_->FreeUnused();

	// Check that the new largest free size takes into account the unused block.
	EXPECT_EQ(kSize, allocator_->GetLargestFreeSize());

	// Free two more.
	token = helper_.get()->InsertToken();
	allocator_->FreePendingToken(offsets[1], token);
	token = helper_.get()->InsertToken();
	allocator_->FreePendingToken(offsets[2], token);
	EXPECT_TRUE(allocator_->CheckConsistency());

	// Check that nothing has changed.
	EXPECT_EQ(kSize, allocator_->GetLargestFreeSize());

	// Force the command buffer to process the token.
	helper_->Finish();

	// Tell the allocator to update what's available based on the current token.
	allocator_->FreeUnused();

	// Check that the new largest free size takes into account the unused blocks.
	EXPECT_EQ(kSize * 3, allocator_->GetLargestFreeSize());
	EXPECT_TRUE(allocator_->InUseOrFreePending());

	// Free up everything.
	for (unsigned int i = 3; i < kAllocCount; ++i) {
	allocator_->Free(offsets[i]);
	EXPECT_TRUE(allocator_->CheckConsistency());
	}
	EXPECT_FALSE(allocator_->InUseOrFreePending());
	}

	// Tests GetLargestFreeSize
	TEST_F(FencedAllocatorTest, TestGetLargestFreeSize) {
	EXPECT_TRUE(allocator_->CheckConsistency());
	EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeSize());

	FencedAllocator::Offset offset = allocator_->Alloc(kBufferSize);
	ASSERT_NE(FencedAllocator::kInvalidOffset, offset);
	EXPECT_EQ(0u, allocator_->GetLargestFreeSize());
	allocator_->Free(offset);
	EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeSize());

	const unsigned int kSize = 16;
	offset = allocator_->Alloc(kSize);
	ASSERT_NE(FencedAllocator::kInvalidOffset, offset);
	// The following checks that the buffer is allocated "smartly" - which is
	// dependent on the implementation. But both first-fit or best-fit would
	// ensure that.
	EXPECT_EQ(kBufferSize - kSize, allocator_->GetLargestFreeSize());

	// Allocate 2 more buffers (now 3), and then free the first two. This is to
	// ensure a hole. Note that this is dependent on the first-fit current
	// implementation.
	FencedAllocator::Offset offset1 = allocator_->Alloc(kSize);
	ASSERT_NE(FencedAllocator::kInvalidOffset, offset1);
	FencedAllocator::Offset offset2 = allocator_->Alloc(kSize);
	ASSERT_NE(FencedAllocator::kInvalidOffset, offset2);
	allocator_->Free(offset);
	allocator_->Free(offset1);
	EXPECT_EQ(kBufferSize - 3 * kSize, allocator_->GetLargestFreeSize());

	offset = allocator_->Alloc(kBufferSize - 3 * kSize);
	ASSERT_NE(FencedAllocator::kInvalidOffset, offset);
	EXPECT_EQ(2 * kSize, allocator_->GetLargestFreeSize());

	offset1 = allocator_->Alloc(2 * kSize);
	ASSERT_NE(FencedAllocator::kInvalidOffset, offset1);
	EXPECT_EQ(0u, allocator_->GetLargestFreeSize());

	allocator_->Free(offset);
	allocator_->Free(offset1);
	allocator_->Free(offset2);
	}

	// Tests GetLargestFreeOrPendingSize
	TEST_F(FencedAllocatorTest, TestGetLargestFreeOrPendingSize) {
	EXPECT_TRUE(allocator_->CheckConsistency());
	EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeOrPendingSize());

	FencedAllocator::Offset offset = allocator_->Alloc(kBufferSize);
	ASSERT_NE(FencedAllocator::kInvalidOffset, offset);
	EXPECT_EQ(0u, allocator_->GetLargestFreeOrPendingSize());
	allocator_->Free(offset);
	EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeOrPendingSize());

	const unsigned int kSize = 16;
	offset = allocator_->Alloc(kSize);
	ASSERT_NE(FencedAllocator::kInvalidOffset, offset);
	// The following checks that the buffer is allocates "smartly" - which is
	// dependent on the implementation. But both first-fit or best-fit would
	// ensure that.
	EXPECT_EQ(kBufferSize - kSize, allocator_->GetLargestFreeOrPendingSize());

	// Allocate 2 more buffers (now 3), and then free the first two. This is to
	// ensure a hole. Note that this is dependent on the first-fit current
	// implementation.
	FencedAllocator::Offset offset1 = allocator_->Alloc(kSize);
	ASSERT_NE(FencedAllocator::kInvalidOffset, offset1);
	FencedAllocator::Offset offset2 = allocator_->Alloc(kSize);
	ASSERT_NE(FencedAllocator::kInvalidOffset, offset2);
	allocator_->Free(offset);
	allocator_->Free(offset1);
	EXPECT_EQ(kBufferSize - 3 * kSize,
	allocator_->GetLargestFreeOrPendingSize());

	// Free the last one, pending a token.
	int32_t token = helper_.get()->InsertToken();
	allocator_->FreePendingToken(offset2, token);

	// Now all the buffers have been freed...
	EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeOrPendingSize());
	// .. but one is still waiting for the token.
	EXPECT_EQ(kBufferSize - 3 * kSize,
	allocator_->GetLargestFreeSize());

	// The way we hooked up the helper and engine, it won't process commands
	// until it has to wait for something. Which means the token shouldn't have
	// passed yet at this point.
	EXPECT_GT(token, GetToken());
	// This allocation will need to reclaim the space freed above, so that should
	// process the commands until the token is passed, but it will succeed.
	offset = allocator_->Alloc(kBufferSize);
	ASSERT_NE(FencedAllocator::kInvalidOffset, offset);
	// Check that the token has indeed passed.
	EXPECT_LE(token, GetToken());
	allocator_->Free(offset);

	// Everything now has been freed...
	EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeOrPendingSize());
	// ... for real.
	EXPECT_EQ(kBufferSize, allocator_->GetLargestFreeSize());
	}

	// Test fixture for FencedAllocatorWrapper test - Creates a
	// FencedAllocatorWrapper, using a CommandBufferHelper with a mock
	// AsyncAPIInterface for its interface (calling it directly, not through the
	// RPC mechanism), making sure Noops are ignored and SetToken are properly
	// forwarded to the engine.
	class FencedAllocatorWrapperTest : public BaseFencedAllocatorTest {
	protected:
	void SetUp() override {
	BaseFencedAllocatorTest::SetUp();

	// Though allocating this buffer isn't strictly necessary, it makes
	// allocations point to valid addresses, so they could be used for
	// something.
	buffer_.reset(static_cast<char*>(base::AlignedAlloc(
	kBufferSize, kAllocAlignment)));
	allocator_.reset(new FencedAllocatorWrapper(kBufferSize,
	helper_.get(),
	buffer_.get()));
	}

	void TearDown() override {
	// If the CommandExecutor posts any tasks, this forces them to run.
	base::RunLoop().RunUntilIdle();

	EXPECT_TRUE(allocator_->CheckConsistency());

	BaseFencedAllocatorTest::TearDown();
	}

	std::unique_ptr<FencedAllocatorWrapper> allocator_;
	std::unique_ptr<char, base::AlignedFreeDeleter> buffer_;
	};

	// Checks basic alloc and free.
	TEST_F(FencedAllocatorWrapperTest, TestBasic) {
	allocator_->CheckConsistency();

	const unsigned int kSize = 16;
	void *pointer = allocator_->Alloc(kSize);
	ASSERT_TRUE(pointer);
	EXPECT_LE(buffer_.get(), static_cast<char *>(pointer));
	EXPECT_GE(kBufferSize, static_cast<char *>(pointer) - buffer_.get() + kSize);
	EXPECT_TRUE(allocator_->CheckConsistency());

	allocator_->Free(pointer);
	EXPECT_TRUE(allocator_->CheckConsistency());

	char *pointer_char = allocator_->AllocTyped<char>(kSize);
	ASSERT_TRUE(pointer_char);
	EXPECT_LE(buffer_.get(), pointer_char);
	EXPECT_GE(buffer_.get() + kBufferSize, pointer_char + kSize);
	allocator_->Free(pointer_char);
	EXPECT_TRUE(allocator_->CheckConsistency());

	unsigned int *pointer_uint = allocator_->AllocTyped<unsigned int>(kSize);
	ASSERT_TRUE(pointer_uint);
	EXPECT_LE(buffer_.get(), reinterpret_cast<char *>(pointer_uint));
	EXPECT_GE(buffer_.get() + kBufferSize,
	reinterpret_cast<char *>(pointer_uint + kSize));

	// Check that it did allocate kSize * sizeof(unsigned int). We can't tell
	// directly, except from the remaining size.
	EXPECT_EQ(kBufferSize - kSize * sizeof(*pointer_uint),
	allocator_->GetLargestFreeSize());
	allocator_->Free(pointer_uint);
	}

	// Test alloc 0 fails.
	TEST_F(FencedAllocatorWrapperTest, TestAllocZero) {
	allocator_->CheckConsistency();

	void *pointer = allocator_->Alloc(0);
	ASSERT_FALSE(pointer);
	EXPECT_TRUE(allocator_->CheckConsistency());
	}

	// Checks that allocation offsets are aligned to multiples of 16 bytes.
	TEST_F(FencedAllocatorWrapperTest, TestAlignment) {
	allocator_->CheckConsistency();

	const unsigned int kSize1 = 75;
	void *pointer1 = allocator_->Alloc(kSize1);
	ASSERT_TRUE(pointer1);
	EXPECT_EQ(reinterpret_cast<intptr_t>(pointer1) & (kAllocAlignment - 1), 0);
	EXPECT_TRUE(allocator_->CheckConsistency());

	const unsigned int kSize2 = 43;
	void *pointer2 = allocator_->Alloc(kSize2);
	ASSERT_TRUE(pointer2);
	EXPECT_EQ(reinterpret_cast<intptr_t>(pointer2) & (kAllocAlignment - 1), 0);
	EXPECT_TRUE(allocator_->CheckConsistency());

	allocator_->Free(pointer2);
	EXPECT_TRUE(allocator_->CheckConsistency());

	allocator_->Free(pointer1);
	EXPECT_TRUE(allocator_->CheckConsistency());
	}

	// Checks out-of-memory condition.
	TEST_F(FencedAllocatorWrapperTest, TestOutOfMemory) {
	allocator_->CheckConsistency();

	const unsigned int kSize = 16;
	const unsigned int kAllocCount = kBufferSize / kSize;
	CHECK(kAllocCount * kSize == kBufferSize);

	// Allocate several buffers to fill in the memory.
	void *pointers[kAllocCount];
	for (unsigned int i = 0; i < kAllocCount; ++i) {
	pointers[i] = allocator_->Alloc(kSize);
	EXPECT_TRUE(pointers[i]);
	EXPECT_TRUE(allocator_->CheckConsistency());
	}

	// This allocation should fail.
	void *pointer_failed = allocator_->Alloc(kSize);
	EXPECT_FALSE(pointer_failed);
	EXPECT_TRUE(allocator_->CheckConsistency());

	// Free one successful allocation, reallocate with half the size
	allocator_->Free(pointers[0]);
	EXPECT_TRUE(allocator_->CheckConsistency());
	pointers[0] = allocator_->Alloc(kSize/2);
	EXPECT_TRUE(pointers[0]);
	EXPECT_TRUE(allocator_->CheckConsistency());

	// This allocation should fail as well.
	pointer_failed = allocator_->Alloc(kSize);
	EXPECT_FALSE(pointer_failed);
	EXPECT_TRUE(allocator_->CheckConsistency());

	// Free up everything.
	for (unsigned int i = 0; i < kAllocCount; ++i) {
	allocator_->Free(pointers[i]);
	EXPECT_TRUE(allocator_->CheckConsistency());
	}
	}

	// Checks the free-pending-token mechanism.
	TEST_F(FencedAllocatorWrapperTest, TestFreePendingToken) {
	allocator_->CheckConsistency();

	const unsigned int kSize = 16;
	const unsigned int kAllocCount = kBufferSize / kSize;
	CHECK(kAllocCount * kSize == kBufferSize);

	// Allocate several buffers to fill in the memory.
	void *pointers[kAllocCount];
	for (unsigned int i = 0; i < kAllocCount; ++i) {
	pointers[i] = allocator_->Alloc(kSize);
	EXPECT_TRUE(pointers[i]);
	EXPECT_TRUE(allocator_->CheckConsistency());
	}

	// This allocation should fail.
	void *pointer_failed = allocator_->Alloc(kSize);
	EXPECT_FALSE(pointer_failed);
	EXPECT_TRUE(allocator_->CheckConsistency());

	// Free one successful allocation, pending fence.
	int32_t token = helper_.get()->InsertToken();
	allocator_->FreePendingToken(pointers[0], token);
	EXPECT_TRUE(allocator_->CheckConsistency());

	// The way we hooked up the helper and engine, it won't process commands
	// until it has to wait for something. Which means the token shouldn't have
	// passed yet at this point.
	EXPECT_GT(token, GetToken());

	// This allocation will need to reclaim the space freed above, so that should
	// process the commands until the token is passed.
	pointers[0] = allocator_->Alloc(kSize);
	EXPECT_TRUE(pointers[0]);
	EXPECT_TRUE(allocator_->CheckConsistency());
	// Check that the token has indeed passed.
	EXPECT_LE(token, GetToken());

	// Free up everything.
	for (unsigned int i = 0; i < kAllocCount; ++i) {
	allocator_->Free(pointers[i]);
	EXPECT_TRUE(allocator_->CheckConsistency());
	}
	}

	} // namespace gpu