test/fuzz/transformation_add_dead_block_test.cpp - SwiftShader - Git at Google

 // Copyright (c) 2019 Google LLC
 //
 // 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 "source/fuzz/transformation_add_dead_block.h"

 #include "gtest/gtest.h"
 #include "source/fuzz/fuzzer_util.h"
 #include "test/fuzz/fuzz_test_util.h"

 namespace spvtools {
 namespace fuzz {
 namespace {

 TEST(TransformationAddDeadBlockTest, BasicTest) {
   std::string reference_shader = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Fragment %6 "main"
                OpExecutionMode %6 OriginUpperLeft

 ; Types
           %2 = OpTypeBool
           %3 = OpTypeVoid
           %4 = OpTypeFunction %3

 ; Constants
           %5 = OpConstantTrue %2

 ; main function
           %6 = OpFunction %3 None %4
           %7 = OpLabel
                OpSelectionMerge %11 None
                OpBranchConditional %5 %8 %9
           %8 = OpLabel
                OpBranch %10
           %9 = OpLabel
                OpBranch %10
          %10 = OpLabel
                OpBranch %11
          %11 = OpLabel
                OpBranch %13
          %12 = OpLabel
                OpBranch %13
          %13 = OpLabel
                OpReturn
                OpFunctionEnd
   )";

   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
   spvtools::ValidatorOptions validator_options;
   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Id 4 is already in use
   auto transformation = TransformationAddDeadBlock(4, 11, true);
   ASSERT_FALSE(
       transformation.IsApplicable(context.get(), transformation_context));

   // Id 5 is not a block
   transformation = TransformationAddDeadBlock(14, 5, true);
   ASSERT_FALSE(
       transformation.IsApplicable(context.get(), transformation_context));

   // Tests existing block not dominating its successor block.
   transformation = TransformationAddDeadBlock(14, 8, true);
   ASSERT_FALSE(
       transformation.IsApplicable(context.get(), transformation_context));

   transformation = TransformationAddDeadBlock(14, 9, true);
   ASSERT_FALSE(
       transformation.IsApplicable(context.get(), transformation_context));

   // Tests existing block being an unreachable block.
   transformation = TransformationAddDeadBlock(14, 12, true);
   ASSERT_FALSE(
       transformation.IsApplicable(context.get(), transformation_context));

   // Tests applicable case.
   transformation = TransformationAddDeadBlock(14, 11, true);
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);

   ASSERT_TRUE(transformation_context.GetFactManager()->BlockIsDead(14));

   std::string variant_shader = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Fragment %6 "main"
                OpExecutionMode %6 OriginUpperLeft

 ; Types
           %2 = OpTypeBool
           %3 = OpTypeVoid
           %4 = OpTypeFunction %3

 ; Constants
           %5 = OpConstantTrue %2

 ; main function
           %6 = OpFunction %3 None %4
           %7 = OpLabel
                OpSelectionMerge %11 None
                OpBranchConditional %5 %8 %9
           %8 = OpLabel
                OpBranch %10
           %9 = OpLabel
                OpBranch %10
          %10 = OpLabel
                OpBranch %11
          %11 = OpLabel
                OpSelectionMerge %13 None
                OpBranchConditional %5 %13 %14
          %14 = OpLabel
                OpBranch %13
          %12 = OpLabel
                OpBranch %13
          %13 = OpLabel
                OpReturn
                OpFunctionEnd
   )";

   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }

 TEST(TransformationAddDeadBlockTest, ApplicableWithFalseCondition) {
   std::string reference_shader = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Fragment %6 "main"
                OpExecutionMode %6 OriginUpperLeft

 ; Types
           %2 = OpTypeBool
           %3 = OpTypeVoid
           %4 = OpTypeFunction %3

 ; Constants
           %5 = OpConstantFalse %2

 ; main function
           %6 = OpFunction %3 None %4
           %7 = OpLabel
                OpSelectionMerge %11 None
                OpBranchConditional %5 %8 %9
           %8 = OpLabel
                OpBranch %10
           %9 = OpLabel
                OpBranch %10
          %10 = OpLabel
                OpBranch %11
          %11 = OpLabel
                OpBranch %13
          %12 = OpLabel
                OpBranch %13
          %13 = OpLabel
                OpReturn
                OpFunctionEnd
   )";
   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context =
       BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
   spvtools::ValidatorOptions validator_options;
   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   auto transformation = TransformationAddDeadBlock(14, 11, false);

   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);

   std::string variant_shader = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Fragment %6 "main"
                OpExecutionMode %6 OriginUpperLeft

 ; Types
           %2 = OpTypeBool
           %3 = OpTypeVoid
           %4 = OpTypeFunction %3

 ; Constants
           %5 = OpConstantFalse %2

 ; main function
           %6 = OpFunction %3 None %4
           %7 = OpLabel
                OpSelectionMerge %11 None
                OpBranchConditional %5 %8 %9
           %8 = OpLabel
                OpBranch %10
           %9 = OpLabel
                OpBranch %10
          %10 = OpLabel
                OpBranch %11
          %11 = OpLabel
                OpSelectionMerge %13 None
                OpBranchConditional %5 %14 %13
          %14 = OpLabel
                OpBranch %13
          %12 = OpLabel
                OpBranch %13
          %13 = OpLabel
                OpReturn
                OpFunctionEnd
   )";

   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));
   ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
 }

 TEST(TransformationAddDeadBlockTest, TargetBlockMustNotBeSelectionMerge) {
   std::string shader = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Fragment %4 "main"
                OpExecutionMode %4 OriginUpperLeft
                OpSource ESSL 310
                OpName %4 "main"
           %2 = OpTypeVoid
           %3 = OpTypeFunction %2
           %6 = OpTypeBool
           %7 = OpConstantTrue %6
           %4 = OpFunction %2 None %3
           %5 = OpLabel
                OpSelectionMerge %10 None
                OpBranchConditional %7 %8 %9
           %8 = OpLabel
                OpBranch %10
           %9 = OpLabel
                OpBranch %10
          %10 = OpLabel
                OpReturn
                OpFunctionEnd
   )";

   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   spvtools::ValidatorOptions validator_options;
   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   ASSERT_FALSE(TransformationAddDeadBlock(100, 9, true)
                    .IsApplicable(context.get(), transformation_context));
 }

 TEST(TransformationAddDeadBlockTest, TargetBlockMustNotBeLoopMergeOrContinue) {
   std::string shader = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Fragment %6 "main"
                OpExecutionMode %6 OriginUpperLeft

 ; Types
           %2 = OpTypeBool
           %3 = OpTypeVoid
           %4 = OpTypeFunction %3

 ; Constants
           %5 = OpConstantTrue %2

 ; main function
           %6 = OpFunction %3 None %4
           %7 = OpLabel
                OpBranch %8
           %8 = OpLabel
                OpLoopMerge %12 %11 None
                OpBranchConditional %5 %9 %10
           %9 = OpLabel
                OpBranch %11
          %10 = OpLabel
                OpBranch %12
          %11 = OpLabel
                OpBranch %8
          %12 = OpLabel
                OpReturn
                OpFunctionEnd
   )";

   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   spvtools::ValidatorOptions validator_options;
   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad because 9's successor is the loop continue target.
   ASSERT_FALSE(TransformationAddDeadBlock(100, 9, true)
                    .IsApplicable(context.get(), transformation_context));
   // Bad because 10's successor is the loop merge.
   ASSERT_FALSE(TransformationAddDeadBlock(100, 10, true)
                    .IsApplicable(context.get(), transformation_context));
 }

 TEST(TransformationAddDeadBlockTest, SourceBlockMustNotBeLoopHead) {
   std::string shader = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Fragment %4 "main"
                OpExecutionMode %4 OriginUpperLeft
                OpSource ESSL 310
                OpName %4 "main"
           %2 = OpTypeVoid
           %3 = OpTypeFunction %2
           %6 = OpTypeBool
           %7 = OpConstantTrue %6
           %4 = OpFunction %2 None %3
           %5 = OpLabel
                OpBranch %8
           %8 = OpLabel
                OpLoopMerge %11 %12 None
                OpBranch %9
           %9 = OpLabel
                OpBranchConditional %7 %11 %12
          %12 = OpLabel
                OpBranch %8
          %11 = OpLabel
                OpReturn
                OpFunctionEnd
   )";

   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   spvtools::ValidatorOptions validator_options;
   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // Bad because 8 is a loop head.
   ASSERT_FALSE(TransformationAddDeadBlock(100, 8, true)
                    .IsApplicable(context.get(), transformation_context));
 }

 TEST(TransformationAddDeadBlockTest, OpPhiInTarget) {
   std::string shader = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Fragment %4 "main"
                OpExecutionMode %4 OriginUpperLeft
                OpSource ESSL 310
                OpName %4 "main"
           %2 = OpTypeVoid
           %3 = OpTypeFunction %2
           %6 = OpTypeBool
           %7 = OpConstantTrue %6
           %9 = OpTypeInt 32 0
          %10 = OpConstant %9 1
           %4 = OpFunction %2 None %3
           %5 = OpLabel
                OpBranch %8
           %8 = OpLabel
          %12 = OpPhi %6 %7 %5
          %13 = OpPhi %9 %10 %5
                OpReturn
                OpFunctionEnd
   )";

   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   spvtools::ValidatorOptions validator_options;
   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   TransformationAddDeadBlock transformation(100, 5, true);
   ASSERT_TRUE(
       transformation.IsApplicable(context.get(), transformation_context));
   ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));

   ASSERT_TRUE(transformation_context.GetFactManager()->BlockIsDead(100));

   std::string after_transformation = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Fragment %4 "main"
                OpExecutionMode %4 OriginUpperLeft
                OpSource ESSL 310
                OpName %4 "main"
           %2 = OpTypeVoid
           %3 = OpTypeFunction %2
           %6 = OpTypeBool
           %7 = OpConstantTrue %6
           %9 = OpTypeInt 32 0
          %10 = OpConstant %9 1
           %4 = OpFunction %2 None %3
           %5 = OpLabel
                OpSelectionMerge %8 None
                OpBranchConditional %7 %8 %100
         %100 = OpLabel
                OpBranch %8
           %8 = OpLabel
          %12 = OpPhi %6 %7 %5 %7 %100
          %13 = OpPhi %9 %10 %5 %10 %100
                OpReturn
                OpFunctionEnd
   )";
   ASSERT_TRUE(IsEqual(env, after_transformation, context.get()));
 }

 TEST(TransformationAddDeadBlockTest, BackEdge) {
   std::string shader = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"
                OpMemoryModel Logical GLSL450
                OpEntryPoint Fragment %4 "main"
                OpExecutionMode %4 OriginUpperLeft
                OpSource ESSL 310
                OpName %4 "main"
           %2 = OpTypeVoid
           %3 = OpTypeFunction %2
           %6 = OpTypeBool
           %7 = OpConstantTrue %6
           %4 = OpFunction %2 None %3
           %5 = OpLabel
                OpBranch %8
           %8 = OpLabel
                OpLoopMerge %10 %9 None
                OpBranchConditional %7 %9 %10
           %9 = OpLabel
                OpBranch %8
          %10 = OpLabel
                OpReturn
                OpFunctionEnd
   )";

   const auto env = SPV_ENV_UNIVERSAL_1_4;
   const auto consumer = nullptr;
   const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
   spvtools::ValidatorOptions validator_options;
   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));
   TransformationContext transformation_context(
       MakeUnique<FactManager>(context.get()), validator_options);
   // 9 is a back edge block, so it would not be OK to add a dead block here,
   // as then both 9 and the dead block would branch to the loop header, 8.
   ASSERT_FALSE(TransformationAddDeadBlock(100, 9, true)
                    .IsApplicable(context.get(), transformation_context));
 }

 }  // namespace
 }  // namespace fuzz
 }  // namespace spvtools
	// Copyright (c) 2019 Google LLC
	//
	// 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 "source/fuzz/transformation_add_dead_block.h"

	#include "gtest/gtest.h"
	#include "source/fuzz/fuzzer_util.h"
	#include "test/fuzz/fuzz_test_util.h"

	namespace spvtools {
	namespace fuzz {
	namespace {

	TEST(TransformationAddDeadBlockTest, BasicTest) {
	std::string reference_shader = R"(
	OpCapability Shader
	%1 = OpExtInstImport "GLSL.std.450"
	OpMemoryModel Logical GLSL450
	OpEntryPoint Fragment %6 "main"
	OpExecutionMode %6 OriginUpperLeft

	; Types
	%2 = OpTypeBool
	%3 = OpTypeVoid
	%4 = OpTypeFunction %3

	; Constants
	%5 = OpConstantTrue %2

	; main function
	%6 = OpFunction %3 None %4
	%7 = OpLabel
	OpSelectionMerge %11 None
	OpBranchConditional %5 %8 %9
	%8 = OpLabel
	OpBranch %10
	%9 = OpLabel
	OpBranch %10
	%10 = OpLabel
	OpBranch %11
	%11 = OpLabel
	OpBranch %13
	%12 = OpLabel
	OpBranch %13
	%13 = OpLabel
	OpReturn
	OpFunctionEnd
	)";

	const auto env = SPV_ENV_UNIVERSAL_1_4;
	const auto consumer = nullptr;
	const auto context =
	BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
	spvtools::ValidatorOptions validator_options;
	ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
	kConsoleMessageConsumer));
	TransformationContext transformation_context(
	MakeUnique<FactManager>(context.get()), validator_options);
	// Id 4 is already in use
	auto transformation = TransformationAddDeadBlock(4, 11, true);
	ASSERT_FALSE(
	transformation.IsApplicable(context.get(), transformation_context));

	// Id 5 is not a block
	transformation = TransformationAddDeadBlock(14, 5, true);
	ASSERT_FALSE(
	transformation.IsApplicable(context.get(), transformation_context));

	// Tests existing block not dominating its successor block.
	transformation = TransformationAddDeadBlock(14, 8, true);
	ASSERT_FALSE(
	transformation.IsApplicable(context.get(), transformation_context));

	transformation = TransformationAddDeadBlock(14, 9, true);
	ASSERT_FALSE(
	transformation.IsApplicable(context.get(), transformation_context));

	// Tests existing block being an unreachable block.
	transformation = TransformationAddDeadBlock(14, 12, true);
	ASSERT_FALSE(
	transformation.IsApplicable(context.get(), transformation_context));

	// Tests applicable case.
	transformation = TransformationAddDeadBlock(14, 11, true);
	ASSERT_TRUE(
	transformation.IsApplicable(context.get(), transformation_context));
	ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);

	ASSERT_TRUE(transformation_context.GetFactManager()->BlockIsDead(14));

	std::string variant_shader = R"(
	OpCapability Shader
	%1 = OpExtInstImport "GLSL.std.450"
	OpMemoryModel Logical GLSL450
	OpEntryPoint Fragment %6 "main"
	OpExecutionMode %6 OriginUpperLeft

	; Types
	%2 = OpTypeBool
	%3 = OpTypeVoid
	%4 = OpTypeFunction %3

	; Constants
	%5 = OpConstantTrue %2

	; main function
	%6 = OpFunction %3 None %4
	%7 = OpLabel
	OpSelectionMerge %11 None
	OpBranchConditional %5 %8 %9
	%8 = OpLabel
	OpBranch %10
	%9 = OpLabel
	OpBranch %10
	%10 = OpLabel
	OpBranch %11
	%11 = OpLabel
	OpSelectionMerge %13 None
	OpBranchConditional %5 %13 %14
	%14 = OpLabel
	OpBranch %13
	%12 = OpLabel
	OpBranch %13
	%13 = OpLabel
	OpReturn
	OpFunctionEnd
	)";

	ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
	kConsoleMessageConsumer));
	ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
	}

	TEST(TransformationAddDeadBlockTest, ApplicableWithFalseCondition) {
	std::string reference_shader = R"(
	OpCapability Shader
	%1 = OpExtInstImport "GLSL.std.450"
	OpMemoryModel Logical GLSL450
	OpEntryPoint Fragment %6 "main"
	OpExecutionMode %6 OriginUpperLeft

	; Types
	%2 = OpTypeBool
	%3 = OpTypeVoid
	%4 = OpTypeFunction %3

	; Constants
	%5 = OpConstantFalse %2

	; main function
	%6 = OpFunction %3 None %4
	%7 = OpLabel
	OpSelectionMerge %11 None
	OpBranchConditional %5 %8 %9
	%8 = OpLabel
	OpBranch %10
	%9 = OpLabel
	OpBranch %10
	%10 = OpLabel
	OpBranch %11
	%11 = OpLabel
	OpBranch %13
	%12 = OpLabel
	OpBranch %13
	%13 = OpLabel
	OpReturn
	OpFunctionEnd
	)";
	const auto env = SPV_ENV_UNIVERSAL_1_4;
	const auto consumer = nullptr;
	const auto context =
	BuildModule(env, consumer, reference_shader, kFuzzAssembleOption);
	spvtools::ValidatorOptions validator_options;
	ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
	kConsoleMessageConsumer));
	TransformationContext transformation_context(
	MakeUnique<FactManager>(context.get()), validator_options);
	auto transformation = TransformationAddDeadBlock(14, 11, false);

	ASSERT_TRUE(
	transformation.IsApplicable(context.get(), transformation_context));
	ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);

	std::string variant_shader = R"(
	OpCapability Shader
	%1 = OpExtInstImport "GLSL.std.450"
	OpMemoryModel Logical GLSL450
	OpEntryPoint Fragment %6 "main"
	OpExecutionMode %6 OriginUpperLeft

	; Types
	%2 = OpTypeBool
	%3 = OpTypeVoid
	%4 = OpTypeFunction %3

	; Constants
	%5 = OpConstantFalse %2

	; main function
	%6 = OpFunction %3 None %4
	%7 = OpLabel
	OpSelectionMerge %11 None
	OpBranchConditional %5 %8 %9
	%8 = OpLabel
	OpBranch %10
	%9 = OpLabel
	OpBranch %10
	%10 = OpLabel
	OpBranch %11
	%11 = OpLabel
	OpSelectionMerge %13 None
	OpBranchConditional %5 %14 %13
	%14 = OpLabel
	OpBranch %13
	%12 = OpLabel
	OpBranch %13
	%13 = OpLabel
	OpReturn
	OpFunctionEnd
	)";

	ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
	kConsoleMessageConsumer));
	ASSERT_TRUE(IsEqual(env, variant_shader, context.get()));
	}

	TEST(TransformationAddDeadBlockTest, TargetBlockMustNotBeSelectionMerge) {
	std::string shader = R"(
	OpCapability Shader
	%1 = OpExtInstImport "GLSL.std.450"
	OpMemoryModel Logical GLSL450
	OpEntryPoint Fragment %4 "main"
	OpExecutionMode %4 OriginUpperLeft
	OpSource ESSL 310
	OpName %4 "main"
	%2 = OpTypeVoid
	%3 = OpTypeFunction %2
	%6 = OpTypeBool
	%7 = OpConstantTrue %6
	%4 = OpFunction %2 None %3
	%5 = OpLabel
	OpSelectionMerge %10 None
	OpBranchConditional %7 %8 %9
	%8 = OpLabel
	OpBranch %10
	%9 = OpLabel
	OpBranch %10
	%10 = OpLabel
	OpReturn
	OpFunctionEnd
	)";

	const auto env = SPV_ENV_UNIVERSAL_1_4;
	const auto consumer = nullptr;
	const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
	spvtools::ValidatorOptions validator_options;
	ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
	kConsoleMessageConsumer));
	TransformationContext transformation_context(
	MakeUnique<FactManager>(context.get()), validator_options);
	ASSERT_FALSE(TransformationAddDeadBlock(100, 9, true)
	.IsApplicable(context.get(), transformation_context));
	}

	TEST(TransformationAddDeadBlockTest, TargetBlockMustNotBeLoopMergeOrContinue) {
	std::string shader = R"(
	OpCapability Shader
	%1 = OpExtInstImport "GLSL.std.450"
	OpMemoryModel Logical GLSL450
	OpEntryPoint Fragment %6 "main"
	OpExecutionMode %6 OriginUpperLeft

	; Types
	%2 = OpTypeBool
	%3 = OpTypeVoid
	%4 = OpTypeFunction %3

	; Constants
	%5 = OpConstantTrue %2

	; main function
	%6 = OpFunction %3 None %4
	%7 = OpLabel
	OpBranch %8
	%8 = OpLabel
	OpLoopMerge %12 %11 None
	OpBranchConditional %5 %9 %10
	%9 = OpLabel
	OpBranch %11
	%10 = OpLabel
	OpBranch %12
	%11 = OpLabel
	OpBranch %8
	%12 = OpLabel
	OpReturn
	OpFunctionEnd
	)";

	const auto env = SPV_ENV_UNIVERSAL_1_4;
	const auto consumer = nullptr;
	const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
	spvtools::ValidatorOptions validator_options;
	ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
	kConsoleMessageConsumer));
	TransformationContext transformation_context(
	MakeUnique<FactManager>(context.get()), validator_options);
	// Bad because 9's successor is the loop continue target.
	ASSERT_FALSE(TransformationAddDeadBlock(100, 9, true)
	.IsApplicable(context.get(), transformation_context));
	// Bad because 10's successor is the loop merge.
	ASSERT_FALSE(TransformationAddDeadBlock(100, 10, true)
	.IsApplicable(context.get(), transformation_context));
	}

	TEST(TransformationAddDeadBlockTest, SourceBlockMustNotBeLoopHead) {
	std::string shader = R"(
	OpCapability Shader
	%1 = OpExtInstImport "GLSL.std.450"
	OpMemoryModel Logical GLSL450
	OpEntryPoint Fragment %4 "main"
	OpExecutionMode %4 OriginUpperLeft
	OpSource ESSL 310
	OpName %4 "main"
	%2 = OpTypeVoid
	%3 = OpTypeFunction %2
	%6 = OpTypeBool
	%7 = OpConstantTrue %6
	%4 = OpFunction %2 None %3
	%5 = OpLabel
	OpBranch %8
	%8 = OpLabel
	OpLoopMerge %11 %12 None
	OpBranch %9
	%9 = OpLabel
	OpBranchConditional %7 %11 %12
	%12 = OpLabel
	OpBranch %8
	%11 = OpLabel
	OpReturn
	OpFunctionEnd
	)";

	const auto env = SPV_ENV_UNIVERSAL_1_4;
	const auto consumer = nullptr;
	const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
	spvtools::ValidatorOptions validator_options;
	ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
	kConsoleMessageConsumer));
	TransformationContext transformation_context(
	MakeUnique<FactManager>(context.get()), validator_options);
	// Bad because 8 is a loop head.
	ASSERT_FALSE(TransformationAddDeadBlock(100, 8, true)
	.IsApplicable(context.get(), transformation_context));
	}

	TEST(TransformationAddDeadBlockTest, OpPhiInTarget) {
	std::string shader = R"(
	OpCapability Shader
	%1 = OpExtInstImport "GLSL.std.450"
	OpMemoryModel Logical GLSL450
	OpEntryPoint Fragment %4 "main"
	OpExecutionMode %4 OriginUpperLeft
	OpSource ESSL 310
	OpName %4 "main"
	%2 = OpTypeVoid
	%3 = OpTypeFunction %2
	%6 = OpTypeBool
	%7 = OpConstantTrue %6
	%9 = OpTypeInt 32 0
	%10 = OpConstant %9 1
	%4 = OpFunction %2 None %3
	%5 = OpLabel
	OpBranch %8
	%8 = OpLabel
	%12 = OpPhi %6 %7 %5
	%13 = OpPhi %9 %10 %5
	OpReturn
	OpFunctionEnd
	)";

	const auto env = SPV_ENV_UNIVERSAL_1_4;
	const auto consumer = nullptr;
	const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
	spvtools::ValidatorOptions validator_options;
	ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
	kConsoleMessageConsumer));
	TransformationContext transformation_context(
	MakeUnique<FactManager>(context.get()), validator_options);
	TransformationAddDeadBlock transformation(100, 5, true);
	ASSERT_TRUE(
	transformation.IsApplicable(context.get(), transformation_context));
	ApplyAndCheckFreshIds(transformation, context.get(), &transformation_context);
	ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
	kConsoleMessageConsumer));

	ASSERT_TRUE(transformation_context.GetFactManager()->BlockIsDead(100));

	std::string after_transformation = R"(
	OpCapability Shader
	%1 = OpExtInstImport "GLSL.std.450"
	OpMemoryModel Logical GLSL450
	OpEntryPoint Fragment %4 "main"
	OpExecutionMode %4 OriginUpperLeft
	OpSource ESSL 310
	OpName %4 "main"
	%2 = OpTypeVoid
	%3 = OpTypeFunction %2
	%6 = OpTypeBool
	%7 = OpConstantTrue %6
	%9 = OpTypeInt 32 0
	%10 = OpConstant %9 1
	%4 = OpFunction %2 None %3
	%5 = OpLabel
	OpSelectionMerge %8 None
	OpBranchConditional %7 %8 %100
	%100 = OpLabel
	OpBranch %8
	%8 = OpLabel
	%12 = OpPhi %6 %7 %5 %7 %100
	%13 = OpPhi %9 %10 %5 %10 %100
	OpReturn
	OpFunctionEnd
	)";
	ASSERT_TRUE(IsEqual(env, after_transformation, context.get()));
	}

	TEST(TransformationAddDeadBlockTest, BackEdge) {
	std::string shader = R"(
	OpCapability Shader
	%1 = OpExtInstImport "GLSL.std.450"
	OpMemoryModel Logical GLSL450
	OpEntryPoint Fragment %4 "main"
	OpExecutionMode %4 OriginUpperLeft
	OpSource ESSL 310
	OpName %4 "main"
	%2 = OpTypeVoid
	%3 = OpTypeFunction %2
	%6 = OpTypeBool
	%7 = OpConstantTrue %6
	%4 = OpFunction %2 None %3
	%5 = OpLabel
	OpBranch %8
	%8 = OpLabel
	OpLoopMerge %10 %9 None
	OpBranchConditional %7 %9 %10
	%9 = OpLabel
	OpBranch %8
	%10 = OpLabel
	OpReturn
	OpFunctionEnd
	)";

	const auto env = SPV_ENV_UNIVERSAL_1_4;
	const auto consumer = nullptr;
	const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
	spvtools::ValidatorOptions validator_options;
	ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
	kConsoleMessageConsumer));
	TransformationContext transformation_context(
	MakeUnique<FactManager>(context.get()), validator_options);
	// 9 is a back edge block, so it would not be OK to add a dead block here,
	// as then both 9 and the dead block would branch to the loop header, 8.
	ASSERT_FALSE(TransformationAddDeadBlock(100, 9, true)
	.IsApplicable(context.get(), transformation_context));
	}

	} // namespace
	} // namespace fuzz
	} // namespace spvtools