| /* |
| * Copyright (C) 2021 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 "instruction_simplifier.h" |
| |
| #include <initializer_list> |
| #include <tuple> |
| |
| #include "gtest/gtest.h" |
| |
| #include "class_root-inl.h" |
| #include "nodes.h" |
| #include "optimizing/data_type.h" |
| #include "optimizing_unit_test.h" |
| |
| namespace art HIDDEN { |
| |
| namespace mirror { |
| class ClassExt; |
| class Throwable; |
| } // namespace mirror |
| |
| static constexpr bool kDebugSimplifierTests = false; |
| |
| template<typename SuperClass> |
| class InstructionSimplifierTestBase : public SuperClass, public OptimizingUnitTestHelper { |
| public: |
| InstructionSimplifierTestBase() { |
| this->use_boot_image_ = true; // Make the Runtime creation cheaper. |
| } |
| |
| void SetUp() override { |
| SuperClass::SetUp(); |
| gLogVerbosity.compiler = true; |
| } |
| |
| void TearDown() override { |
| SuperClass::TearDown(); |
| gLogVerbosity.compiler = false; |
| } |
| |
| void PerformSimplification(const AdjacencyListGraph& blks) { |
| if (kDebugSimplifierTests) { |
| LOG(INFO) << "Pre simplification " << blks; |
| } |
| graph_->ClearDominanceInformation(); |
| graph_->BuildDominatorTree(); |
| InstructionSimplifier simp(graph_, /*codegen=*/nullptr); |
| simp.Run(); |
| if (kDebugSimplifierTests) { |
| LOG(INFO) << "Post simplify " << blks; |
| } |
| } |
| }; |
| |
| class InstructionSimplifierTest : public InstructionSimplifierTestBase<CommonCompilerTest> {}; |
| |
| // Various configs we can use for testing. Currently used in PartialComparison tests. |
| enum class InstanceOfKind { |
| kSelf, |
| kUnrelatedLoaded, |
| kUnrelatedUnloaded, |
| kSupertype, |
| }; |
| |
| std::ostream& operator<<(std::ostream& os, const InstanceOfKind& comp) { |
| switch (comp) { |
| case InstanceOfKind::kSupertype: |
| return os << "kSupertype"; |
| case InstanceOfKind::kSelf: |
| return os << "kSelf"; |
| case InstanceOfKind::kUnrelatedLoaded: |
| return os << "kUnrelatedLoaded"; |
| case InstanceOfKind::kUnrelatedUnloaded: |
| return os << "kUnrelatedUnloaded"; |
| } |
| } |
| |
| class InstanceOfInstructionSimplifierTestGroup |
| : public InstructionSimplifierTestBase<CommonCompilerTestWithParam<InstanceOfKind>> { |
| public: |
| bool GetConstantResult() const { |
| switch (GetParam()) { |
| case InstanceOfKind::kSupertype: |
| case InstanceOfKind::kSelf: |
| return true; |
| case InstanceOfKind::kUnrelatedLoaded: |
| case InstanceOfKind::kUnrelatedUnloaded: |
| return false; |
| } |
| } |
| |
| std::pair<HLoadClass*, HLoadClass*> GetLoadClasses(VariableSizedHandleScope* vshs) { |
| InstanceOfKind kind = GetParam(); |
| ScopedObjectAccess soa(Thread::Current()); |
| // New inst always needs to have a valid rti since we dcheck that. |
| HLoadClass* new_inst = MakeClassLoad( |
| /* ti= */ std::nullopt, vshs->NewHandle<mirror::Class>(GetClassRoot<mirror::ClassExt>())); |
| new_inst->SetValidLoadedClassRTI(); |
| if (kind == InstanceOfKind::kSelf) { |
| return {new_inst, new_inst}; |
| } |
| if (kind == InstanceOfKind::kUnrelatedUnloaded) { |
| HLoadClass* target_class = MakeClassLoad(); |
| EXPECT_FALSE(target_class->GetLoadedClassRTI().IsValid()); |
| return {new_inst, target_class}; |
| } |
| // Force both classes to be a real classes. |
| // For simplicity we use class-roots as the types. The new-inst will always |
| // be a ClassExt, unrelated-loaded will always be Throwable and super will |
| // always be Object |
| HLoadClass* target_class = MakeClassLoad( |
| /* ti= */ std::nullopt, |
| vshs->NewHandle<mirror::Class>(kind == InstanceOfKind::kSupertype ? |
| GetClassRoot<mirror::Object>() : |
| GetClassRoot<mirror::Throwable>())); |
| target_class->SetValidLoadedClassRTI(); |
| EXPECT_TRUE(target_class->GetLoadedClassRTI().IsValid()); |
| return {new_inst, target_class}; |
| } |
| }; |
| |
| // // ENTRY |
| // switch (param) { |
| // case 1: |
| // obj1 = param2; break; |
| // case 2: |
| // obj1 = param3; break; |
| // default: |
| // obj2 = new Obj(); |
| // } |
| // val_phi = PHI[3,4,10] |
| // target_phi = PHI[param2, param3, obj2] |
| // return PredFieldGet[val_phi, target_phi] => PredFieldGet[val_phi, target_phi] |
| TEST_F(InstructionSimplifierTest, SimplifyPredicatedFieldGetNoMerge) { |
| ScopedObjectAccess soa(Thread::Current()); |
| VariableSizedHandleScope vshs(soa.Self()); |
| CreateGraph(&vshs); |
| AdjacencyListGraph blks(SetupFromAdjacencyList("entry", |
| "exit", |
| {{"entry", "case1"}, |
| {"entry", "case2"}, |
| {"entry", "case3"}, |
| {"case1", "breturn"}, |
| {"case2", "breturn"}, |
| {"case3", "breturn"}, |
| {"breturn", "exit"}})); |
| #define GET_BLOCK(name) HBasicBlock* name = blks.Get(#name) |
| GET_BLOCK(entry); |
| GET_BLOCK(exit); |
| GET_BLOCK(case1); |
| GET_BLOCK(case2); |
| GET_BLOCK(case3); |
| GET_BLOCK(breturn); |
| #undef GET_BLOCK |
| |
| HInstruction* bool_value = MakeParam(DataType::Type::kInt32); |
| HInstruction* obj1_param = MakeParam(DataType::Type::kReference); |
| HInstruction* obj2_param = MakeParam(DataType::Type::kReference); |
| HInstruction* c3 = graph_->GetIntConstant(3); |
| HInstruction* c4 = graph_->GetIntConstant(4); |
| HInstruction* c10 = graph_->GetIntConstant(10); |
| |
| HInstruction* cls = MakeClassLoad(); |
| HInstruction* switch_inst = new (GetAllocator()) HPackedSwitch(0, 2, bool_value); |
| entry->AddInstruction(cls); |
| entry->AddInstruction(switch_inst); |
| ManuallyBuildEnvFor(cls, {}); |
| |
| HInstruction* goto_c1 = new (GetAllocator()) HGoto(); |
| case1->AddInstruction(goto_c1); |
| |
| HInstruction* goto_c2 = new (GetAllocator()) HGoto(); |
| case2->AddInstruction(goto_c2); |
| |
| HInstruction* obj3 = MakeNewInstance(cls); |
| HInstruction* goto_c3 = new (GetAllocator()) HGoto(); |
| case3->AddInstruction(obj3); |
| case3->AddInstruction(goto_c3); |
| |
| HPhi* val_phi = MakePhi({c3, c4, c10}); |
| HPhi* obj_phi = MakePhi({obj1_param, obj2_param, obj3}); |
| HPredicatedInstanceFieldGet* read_end = |
| new (GetAllocator()) HPredicatedInstanceFieldGet(obj_phi, |
| nullptr, |
| val_phi, |
| val_phi->GetType(), |
| MemberOffset(10), |
| false, |
| 42, |
| 0, |
| graph_->GetDexFile(), |
| 0); |
| HInstruction* return_exit = new (GetAllocator()) HReturn(read_end); |
| breturn->AddPhi(val_phi); |
| breturn->AddPhi(obj_phi); |
| breturn->AddInstruction(read_end); |
| breturn->AddInstruction(return_exit); |
| |
| SetupExit(exit); |
| |
| PerformSimplification(blks); |
| |
| EXPECT_INS_RETAINED(read_end); |
| |
| EXPECT_INS_EQ(read_end->GetTarget(), obj_phi); |
| EXPECT_INS_EQ(read_end->GetDefaultValue(), val_phi); |
| } |
| |
| // // ENTRY |
| // switch (param) { |
| // case 1: |
| // obj1 = param2; break; |
| // case 2: |
| // obj1 = param3; break; |
| // default: |
| // obj2 = new Obj(); |
| // } |
| // val_phi = PHI[3,3,10] |
| // target_phi = PHI[param2, param3, obj2] |
| // return PredFieldGet[val_phi, target_phi] => PredFieldGet[3, target_phi] |
| TEST_F(InstructionSimplifierTest, SimplifyPredicatedFieldGetMerge) { |
| ScopedObjectAccess soa(Thread::Current()); |
| VariableSizedHandleScope vshs(soa.Self()); |
| CreateGraph(&vshs); |
| AdjacencyListGraph blks(SetupFromAdjacencyList("entry", |
| "exit", |
| {{"entry", "case1"}, |
| {"entry", "case2"}, |
| {"entry", "case3"}, |
| {"case1", "breturn"}, |
| {"case2", "breturn"}, |
| {"case3", "breturn"}, |
| {"breturn", "exit"}})); |
| #define GET_BLOCK(name) HBasicBlock* name = blks.Get(#name) |
| GET_BLOCK(entry); |
| GET_BLOCK(exit); |
| GET_BLOCK(case1); |
| GET_BLOCK(case2); |
| GET_BLOCK(case3); |
| GET_BLOCK(breturn); |
| #undef GET_BLOCK |
| |
| HInstruction* bool_value = MakeParam(DataType::Type::kInt32); |
| HInstruction* obj1_param = MakeParam(DataType::Type::kReference); |
| HInstruction* obj2_param = MakeParam(DataType::Type::kReference); |
| HInstruction* c3 = graph_->GetIntConstant(3); |
| HInstruction* c10 = graph_->GetIntConstant(10); |
| |
| HInstruction* cls = MakeClassLoad(); |
| HInstruction* switch_inst = new (GetAllocator()) HPackedSwitch(0, 2, bool_value); |
| entry->AddInstruction(cls); |
| entry->AddInstruction(switch_inst); |
| ManuallyBuildEnvFor(cls, {}); |
| |
| HInstruction* goto_c1 = new (GetAllocator()) HGoto(); |
| case1->AddInstruction(goto_c1); |
| |
| HInstruction* goto_c2 = new (GetAllocator()) HGoto(); |
| case2->AddInstruction(goto_c2); |
| |
| HInstruction* obj3 = MakeNewInstance(cls); |
| HInstruction* goto_c3 = new (GetAllocator()) HGoto(); |
| case3->AddInstruction(obj3); |
| case3->AddInstruction(goto_c3); |
| |
| HPhi* val_phi = MakePhi({c3, c3, c10}); |
| HPhi* obj_phi = MakePhi({obj1_param, obj2_param, obj3}); |
| HPredicatedInstanceFieldGet* read_end = |
| new (GetAllocator()) HPredicatedInstanceFieldGet(obj_phi, |
| nullptr, |
| val_phi, |
| val_phi->GetType(), |
| MemberOffset(10), |
| false, |
| 42, |
| 0, |
| graph_->GetDexFile(), |
| 0); |
| HInstruction* return_exit = new (GetAllocator()) HReturn(read_end); |
| breturn->AddPhi(val_phi); |
| breturn->AddPhi(obj_phi); |
| breturn->AddInstruction(read_end); |
| breturn->AddInstruction(return_exit); |
| |
| SetupExit(exit); |
| |
| PerformSimplification(blks); |
| |
| EXPECT_FALSE(obj3->CanBeNull()); |
| EXPECT_INS_RETAINED(read_end); |
| |
| EXPECT_INS_EQ(read_end->GetTarget(), obj_phi); |
| EXPECT_INS_EQ(read_end->GetDefaultValue(), c3); |
| } |
| |
| // // ENTRY |
| // if (param) { |
| // obj1 = new Obj(); |
| // } else { |
| // obj2 = new Obj(); |
| // } |
| // val_phi = PHI[3,10] |
| // target_phi = PHI[obj1, obj2] |
| // return PredFieldGet[val_phi, target_phi] => FieldGet[target_phi] |
| TEST_F(InstructionSimplifierTest, SimplifyPredicatedFieldGetNoNull) { |
| ScopedObjectAccess soa(Thread::Current()); |
| VariableSizedHandleScope vshs(soa.Self()); |
| CreateGraph(&vshs); |
| AdjacencyListGraph blks(SetupFromAdjacencyList("entry", |
| "exit", |
| {{"entry", "left"}, |
| {"entry", "right"}, |
| {"left", "breturn"}, |
| {"right", "breturn"}, |
| {"breturn", "exit"}})); |
| #define GET_BLOCK(name) HBasicBlock* name = blks.Get(#name) |
| GET_BLOCK(entry); |
| GET_BLOCK(exit); |
| GET_BLOCK(left); |
| GET_BLOCK(right); |
| GET_BLOCK(breturn); |
| #undef GET_BLOCK |
| |
| HInstruction* bool_value = MakeParam(DataType::Type::kBool); |
| HInstruction* c3 = graph_->GetIntConstant(3); |
| HInstruction* c10 = graph_->GetIntConstant(10); |
| |
| HInstruction* cls = MakeClassLoad(); |
| HInstruction* if_inst = new (GetAllocator()) HIf(bool_value); |
| entry->AddInstruction(cls); |
| entry->AddInstruction(if_inst); |
| ManuallyBuildEnvFor(cls, {}); |
| |
| HInstruction* obj1 = MakeNewInstance(cls); |
| HInstruction* goto_left = new (GetAllocator()) HGoto(); |
| left->AddInstruction(obj1); |
| left->AddInstruction(goto_left); |
| |
| HInstruction* obj2 = MakeNewInstance(cls); |
| HInstruction* goto_right = new (GetAllocator()) HGoto(); |
| right->AddInstruction(obj2); |
| right->AddInstruction(goto_right); |
| |
| HPhi* val_phi = MakePhi({c3, c10}); |
| HPhi* obj_phi = MakePhi({obj1, obj2}); |
| obj_phi->SetCanBeNull(false); |
| HInstruction* read_end = new (GetAllocator()) HPredicatedInstanceFieldGet(obj_phi, |
| nullptr, |
| val_phi, |
| val_phi->GetType(), |
| MemberOffset(10), |
| false, |
| 42, |
| 0, |
| graph_->GetDexFile(), |
| 0); |
| HInstruction* return_exit = new (GetAllocator()) HReturn(read_end); |
| breturn->AddPhi(val_phi); |
| breturn->AddPhi(obj_phi); |
| breturn->AddInstruction(read_end); |
| breturn->AddInstruction(return_exit); |
| |
| SetupExit(exit); |
| |
| PerformSimplification(blks); |
| |
| EXPECT_FALSE(obj1->CanBeNull()); |
| EXPECT_FALSE(obj2->CanBeNull()); |
| EXPECT_INS_REMOVED(read_end); |
| |
| HInstanceFieldGet* ifget = FindSingleInstruction<HInstanceFieldGet>(graph_, breturn); |
| ASSERT_NE(ifget, nullptr); |
| EXPECT_INS_EQ(ifget->InputAt(0), obj_phi); |
| } |
| |
| // // ENTRY |
| // obj = new Obj(); |
| // // Make sure this graph isn't broken |
| // if (obj instanceof <other>) { |
| // // LEFT |
| // } else { |
| // // RIGHT |
| // } |
| // EXIT |
| // return obj.field |
| TEST_P(InstanceOfInstructionSimplifierTestGroup, ExactClassInstanceOfOther) { |
| ScopedObjectAccess soa(Thread::Current()); |
| VariableSizedHandleScope vshs(soa.Self()); |
| InitGraph(/*handles=*/&vshs); |
| |
| AdjacencyListGraph blks(SetupFromAdjacencyList("entry", |
| "exit", |
| {{"entry", "left"}, |
| {"entry", "right"}, |
| {"left", "breturn"}, |
| {"right", "breturn"}, |
| {"breturn", "exit"}})); |
| #define GET_BLOCK(name) HBasicBlock* name = blks.Get(#name) |
| GET_BLOCK(entry); |
| GET_BLOCK(exit); |
| GET_BLOCK(breturn); |
| GET_BLOCK(left); |
| GET_BLOCK(right); |
| #undef GET_BLOCK |
| EnsurePredecessorOrder(breturn, {left, right}); |
| HInstruction* test_res = graph_->GetIntConstant(GetConstantResult() ? 1 : 0); |
| |
| auto [new_inst_klass, target_klass] = GetLoadClasses(&vshs); |
| HInstruction* new_inst = MakeNewInstance(new_inst_klass); |
| new_inst->SetReferenceTypeInfo( |
| ReferenceTypeInfo::Create(new_inst_klass->GetClass(), /*is_exact=*/true)); |
| HInstanceOf* instance_of = new (GetAllocator()) HInstanceOf(new_inst, |
| target_klass, |
| TypeCheckKind::kClassHierarchyCheck, |
| target_klass->GetClass(), |
| 0u, |
| GetAllocator(), |
| nullptr, |
| nullptr); |
| if (target_klass->GetLoadedClassRTI().IsValid()) { |
| instance_of->SetValidTargetClassRTI(); |
| } |
| HInstruction* if_inst = new (GetAllocator()) HIf(instance_of); |
| entry->AddInstruction(new_inst_klass); |
| if (new_inst_klass != target_klass) { |
| entry->AddInstruction(target_klass); |
| } |
| entry->AddInstruction(new_inst); |
| entry->AddInstruction(instance_of); |
| entry->AddInstruction(if_inst); |
| ManuallyBuildEnvFor(new_inst_klass, {}); |
| if (new_inst_klass != target_klass) { |
| target_klass->CopyEnvironmentFrom(new_inst_klass->GetEnvironment()); |
| } |
| new_inst->CopyEnvironmentFrom(new_inst_klass->GetEnvironment()); |
| |
| HInstruction* goto_left = new (GetAllocator()) HGoto(); |
| left->AddInstruction(goto_left); |
| |
| HInstruction* goto_right = new (GetAllocator()) HGoto(); |
| right->AddInstruction(goto_right); |
| |
| HInstruction* read_bottom = MakeIFieldGet(new_inst, DataType::Type::kInt32, MemberOffset(32)); |
| HInstruction* return_exit = new (GetAllocator()) HReturn(read_bottom); |
| breturn->AddInstruction(read_bottom); |
| breturn->AddInstruction(return_exit); |
| |
| SetupExit(exit); |
| |
| PerformSimplification(blks); |
| |
| if (!GetConstantResult() || GetParam() == InstanceOfKind::kSelf) { |
| EXPECT_INS_RETAINED(target_klass); |
| } else { |
| EXPECT_INS_REMOVED(target_klass); |
| } |
| EXPECT_INS_REMOVED(instance_of); |
| EXPECT_INS_EQ(if_inst->InputAt(0), test_res); |
| } |
| |
| // // ENTRY |
| // obj = new Obj(); |
| // (<other>)obj; |
| // // Make sure this graph isn't broken |
| // EXIT |
| // return obj |
| TEST_P(InstanceOfInstructionSimplifierTestGroup, ExactClassCheckCastOther) { |
| ScopedObjectAccess soa(Thread::Current()); |
| VariableSizedHandleScope vshs(soa.Self()); |
| InitGraph(/*handles=*/&vshs); |
| |
| AdjacencyListGraph blks(SetupFromAdjacencyList("entry", "exit", {{"entry", "exit"}})); |
| #define GET_BLOCK(name) HBasicBlock* name = blks.Get(#name) |
| GET_BLOCK(entry); |
| GET_BLOCK(exit); |
| #undef GET_BLOCK |
| |
| auto [new_inst_klass, target_klass] = GetLoadClasses(&vshs); |
| HInstruction* new_inst = MakeNewInstance(new_inst_klass); |
| new_inst->SetReferenceTypeInfo( |
| ReferenceTypeInfo::Create(new_inst_klass->GetClass(), /*is_exact=*/true)); |
| HCheckCast* check_cast = new (GetAllocator()) HCheckCast(new_inst, |
| target_klass, |
| TypeCheckKind::kClassHierarchyCheck, |
| target_klass->GetClass(), |
| 0u, |
| GetAllocator(), |
| nullptr, |
| nullptr); |
| if (target_klass->GetLoadedClassRTI().IsValid()) { |
| check_cast->SetValidTargetClassRTI(); |
| } |
| HInstruction* entry_return = new (GetAllocator()) HReturn(new_inst); |
| entry->AddInstruction(new_inst_klass); |
| if (new_inst_klass != target_klass) { |
| entry->AddInstruction(target_klass); |
| } |
| entry->AddInstruction(new_inst); |
| entry->AddInstruction(check_cast); |
| entry->AddInstruction(entry_return); |
| ManuallyBuildEnvFor(new_inst_klass, {}); |
| if (new_inst_klass != target_klass) { |
| target_klass->CopyEnvironmentFrom(new_inst_klass->GetEnvironment()); |
| } |
| new_inst->CopyEnvironmentFrom(new_inst_klass->GetEnvironment()); |
| |
| SetupExit(exit); |
| |
| PerformSimplification(blks); |
| |
| if (!GetConstantResult() || GetParam() == InstanceOfKind::kSelf) { |
| EXPECT_INS_RETAINED(target_klass); |
| } else { |
| EXPECT_INS_REMOVED(target_klass); |
| } |
| if (GetConstantResult()) { |
| EXPECT_INS_REMOVED(check_cast); |
| } else { |
| EXPECT_INS_RETAINED(check_cast); |
| } |
| } |
| |
| INSTANTIATE_TEST_SUITE_P(InstructionSimplifierTest, |
| InstanceOfInstructionSimplifierTestGroup, |
| testing::Values(InstanceOfKind::kSelf, |
| InstanceOfKind::kUnrelatedLoaded, |
| InstanceOfKind::kUnrelatedUnloaded, |
| InstanceOfKind::kSupertype)); |
| |
| } // namespace art |
