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/*
* Copyright (C) 2014 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 "base/macros.h"
#include "graph_checker.h"
#include "optimizing_unit_test.h"
namespace art HIDDEN {
class GraphCheckerTest : public CommonCompilerTest, public OptimizingUnitTestHelper {
protected:
HGraph* CreateSimpleCFG();
void TestCode(const std::vector<uint16_t>& data);
};
/**
* Create a simple control-flow graph composed of two blocks:
*
* BasicBlock 0, succ: 1
* 0: ReturnVoid 1
* BasicBlock 1, pred: 0
* 1: Exit
*/
HGraph* GraphCheckerTest::CreateSimpleCFG() {
HGraph* graph = CreateGraph();
HBasicBlock* entry_block = new (GetAllocator()) HBasicBlock(graph);
entry_block->AddInstruction(new (GetAllocator()) HReturnVoid());
graph->AddBlock(entry_block);
graph->SetEntryBlock(entry_block);
HBasicBlock* exit_block = new (GetAllocator()) HBasicBlock(graph);
exit_block->AddInstruction(new (GetAllocator()) HExit());
graph->AddBlock(exit_block);
graph->SetExitBlock(exit_block);
entry_block->AddSuccessor(exit_block);
graph->BuildDominatorTree();
return graph;
}
void GraphCheckerTest::TestCode(const std::vector<uint16_t>& data) {
HGraph* graph = CreateCFG(data);
ASSERT_NE(graph, nullptr);
GraphChecker graph_checker(graph);
graph_checker.Run();
ASSERT_TRUE(graph_checker.IsValid());
}
TEST_F(GraphCheckerTest, ReturnVoid) {
const std::vector<uint16_t> data = ZERO_REGISTER_CODE_ITEM(
Instruction::RETURN_VOID);
TestCode(data);
}
TEST_F(GraphCheckerTest, CFG1) {
const std::vector<uint16_t> data = ZERO_REGISTER_CODE_ITEM(
Instruction::GOTO | 0x100,
Instruction::RETURN_VOID);
TestCode(data);
}
TEST_F(GraphCheckerTest, CFG2) {
const std::vector<uint16_t> data = ONE_REGISTER_CODE_ITEM(
Instruction::CONST_4 | 0 | 0,
Instruction::IF_EQ, 3,
Instruction::GOTO | 0x100,
Instruction::RETURN_VOID);
TestCode(data);
}
TEST_F(GraphCheckerTest, CFG3) {
const std::vector<uint16_t> data = ONE_REGISTER_CODE_ITEM(
Instruction::CONST_4 | 0 | 0,
Instruction::IF_EQ, 3,
Instruction::GOTO | 0x100,
Instruction::GOTO | 0xFF00);
TestCode(data);
}
// Test case with an invalid graph containing inconsistent
// predecessor/successor arcs in CFG.
TEST_F(GraphCheckerTest, InconsistentPredecessorsAndSuccessors) {
HGraph* graph = CreateSimpleCFG();
GraphChecker graph_checker(graph);
graph_checker.Run();
ASSERT_TRUE(graph_checker.IsValid());
// Remove the entry block from the exit block's predecessors, to create an
// inconsistent successor/predecessor relation.
graph->GetExitBlock()->RemovePredecessor(graph->GetEntryBlock());
graph_checker.Run();
ASSERT_FALSE(graph_checker.IsValid());
}
// Test case with an invalid graph containing a non-branch last
// instruction in a block.
TEST_F(GraphCheckerTest, BlockEndingWithNonBranchInstruction) {
HGraph* graph = CreateSimpleCFG();
GraphChecker graph_checker(graph);
graph_checker.Run();
ASSERT_TRUE(graph_checker.IsValid());
// Remove the sole instruction of the exit block (composed of a
// single Exit instruction) to make it invalid (i.e. not ending by a
// branch instruction).
HBasicBlock* exit_block = graph->GetExitBlock();
HInstruction* last_inst = exit_block->GetLastInstruction();
exit_block->RemoveInstruction(last_inst);
graph_checker.Run();
ASSERT_FALSE(graph_checker.IsValid());
}
TEST_F(GraphCheckerTest, SSAPhi) {
// This code creates one Phi function during the conversion to SSA form.
const std::vector<uint16_t> data = ONE_REGISTER_CODE_ITEM(
Instruction::CONST_4 | 0 | 0,
Instruction::IF_EQ, 3,
Instruction::CONST_4 | 4 << 12 | 0,
Instruction::RETURN | 0 << 8);
TestCode(data);
}
} // namespace art
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