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141 lines
4.1 KiB
141 lines
4.1 KiB
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "graph_checker.h"
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#include "optimizing_unit_test.h"
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namespace art {
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class GraphCheckerTest : public OptimizingUnitTest {
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protected:
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HGraph* CreateSimpleCFG();
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void TestCode(const std::vector<uint16_t>& data);
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};
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/**
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* Create a simple control-flow graph composed of two blocks:
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*
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* BasicBlock 0, succ: 1
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* 0: ReturnVoid 1
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* BasicBlock 1, pred: 0
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* 1: Exit
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*/
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HGraph* GraphCheckerTest::CreateSimpleCFG() {
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HGraph* graph = CreateGraph();
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HBasicBlock* entry_block = new (GetAllocator()) HBasicBlock(graph);
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entry_block->AddInstruction(new (GetAllocator()) HReturnVoid());
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graph->AddBlock(entry_block);
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graph->SetEntryBlock(entry_block);
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HBasicBlock* exit_block = new (GetAllocator()) HBasicBlock(graph);
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exit_block->AddInstruction(new (GetAllocator()) HExit());
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graph->AddBlock(exit_block);
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graph->SetExitBlock(exit_block);
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entry_block->AddSuccessor(exit_block);
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graph->BuildDominatorTree();
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return graph;
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}
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void GraphCheckerTest::TestCode(const std::vector<uint16_t>& data) {
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HGraph* graph = CreateCFG(data);
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ASSERT_NE(graph, nullptr);
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GraphChecker graph_checker(graph);
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graph_checker.Run();
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ASSERT_TRUE(graph_checker.IsValid());
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}
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TEST_F(GraphCheckerTest, ReturnVoid) {
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const std::vector<uint16_t> data = ZERO_REGISTER_CODE_ITEM(
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Instruction::RETURN_VOID);
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TestCode(data);
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}
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TEST_F(GraphCheckerTest, CFG1) {
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const std::vector<uint16_t> data = ZERO_REGISTER_CODE_ITEM(
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Instruction::GOTO | 0x100,
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Instruction::RETURN_VOID);
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TestCode(data);
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}
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TEST_F(GraphCheckerTest, CFG2) {
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const std::vector<uint16_t> data = ONE_REGISTER_CODE_ITEM(
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Instruction::CONST_4 | 0 | 0,
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Instruction::IF_EQ, 3,
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Instruction::GOTO | 0x100,
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Instruction::RETURN_VOID);
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TestCode(data);
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}
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TEST_F(GraphCheckerTest, CFG3) {
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const std::vector<uint16_t> data = ONE_REGISTER_CODE_ITEM(
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Instruction::CONST_4 | 0 | 0,
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Instruction::IF_EQ, 3,
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Instruction::GOTO | 0x100,
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Instruction::GOTO | 0xFF00);
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TestCode(data);
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}
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// Test case with an invalid graph containing inconsistent
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// predecessor/successor arcs in CFG.
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TEST_F(GraphCheckerTest, InconsistentPredecessorsAndSuccessors) {
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HGraph* graph = CreateSimpleCFG();
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GraphChecker graph_checker(graph);
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graph_checker.Run();
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ASSERT_TRUE(graph_checker.IsValid());
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// Remove the entry block from the exit block's predecessors, to create an
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// inconsistent successor/predecessor relation.
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graph->GetExitBlock()->RemovePredecessor(graph->GetEntryBlock());
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graph_checker.Run();
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ASSERT_FALSE(graph_checker.IsValid());
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}
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// Test case with an invalid graph containing a non-branch last
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// instruction in a block.
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TEST_F(GraphCheckerTest, BlockEndingWithNonBranchInstruction) {
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HGraph* graph = CreateSimpleCFG();
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GraphChecker graph_checker(graph);
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graph_checker.Run();
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ASSERT_TRUE(graph_checker.IsValid());
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// Remove the sole instruction of the exit block (composed of a
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// single Exit instruction) to make it invalid (i.e. not ending by a
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// branch instruction).
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HBasicBlock* exit_block = graph->GetExitBlock();
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HInstruction* last_inst = exit_block->GetLastInstruction();
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exit_block->RemoveInstruction(last_inst);
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graph_checker.Run();
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ASSERT_FALSE(graph_checker.IsValid());
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}
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TEST_F(GraphCheckerTest, SSAPhi) {
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// This code creates one Phi function during the conversion to SSA form.
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const std::vector<uint16_t> data = ONE_REGISTER_CODE_ITEM(
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Instruction::CONST_4 | 0 | 0,
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Instruction::IF_EQ, 3,
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Instruction::CONST_4 | 4 << 12 | 0,
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Instruction::RETURN | 0 << 8);
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TestCode(data);
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}
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} // namespace art
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