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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.
*/
#ifndef ART_COMPILER_OPTIMIZING_BUILDER_H_
#define ART_COMPILER_OPTIMIZING_BUILDER_H_
#include "dex_file.h"
#include "driver/dex_compilation_unit.h"
#include "utils/allocation.h"
#include "utils/growable_array.h"
namespace art {
class ArenaAllocator;
class Instruction;
class HBasicBlock;
class HGraph;
class HIntConstant;
class HInstruction;
class HLocal;
class HGraphBuilder : public ValueObject {
public:
HGraphBuilder(ArenaAllocator* arena,
const DexCompilationUnit* dex_compilation_unit = nullptr,
const DexFile* dex_file = nullptr)
: arena_(arena),
branch_targets_(arena, 0),
locals_(arena, 0),
entry_block_(nullptr),
exit_block_(nullptr),
current_block_(nullptr),
graph_(nullptr),
constant0_(nullptr),
constant1_(nullptr),
dex_file_(dex_file),
dex_compilation_unit_(dex_compilation_unit) { }
HGraph* BuildGraph(const DexFile::CodeItem& code);
private:
// Analyzes the dex instruction and adds HInstruction to the graph
// to execute that instruction. Returns whether the instruction can
// be handled.
bool AnalyzeDexInstruction(const Instruction& instruction, int32_t dex_offset);
// Finds all instructions that start a new block, and populates branch_targets_ with
// the newly created blocks.
void ComputeBranchTargets(const uint16_t* start, const uint16_t* end);
void MaybeUpdateCurrentBlock(size_t index);
HBasicBlock* FindBlockStartingAt(int32_t index) const;
HIntConstant* GetConstant0();
HIntConstant* GetConstant1();
HIntConstant* GetConstant(int constant);
void InitializeLocals(uint16_t count);
HLocal* GetLocalAt(int register_index) const;
void UpdateLocal(int register_index, HInstruction* instruction) const;
HInstruction* LoadLocal(int register_index) const;
// Temporarily returns whether the compiler supports the parameters
// of the method.
bool InitializeParameters(uint16_t number_of_parameters);
template<typename T> void Binop_32x(const Instruction& instruction);
template<typename T> void Binop_12x(const Instruction& instruction);
template<typename T> void Binop_22b(const Instruction& instruction, bool reverse);
template<typename T> void Binop_22s(const Instruction& instruction, bool reverse);
ArenaAllocator* const arena_;
// A list of the size of the dex code holding block information for
// the method. If an entry contains a block, then the dex instruction
// starting at that entry is the first instruction of a new block.
GrowableArray<HBasicBlock*> branch_targets_;
GrowableArray<HLocal*> locals_;
HBasicBlock* entry_block_;
HBasicBlock* exit_block_;
HBasicBlock* current_block_;
HGraph* graph_;
HIntConstant* constant0_;
HIntConstant* constant1_;
const DexFile* const dex_file_;
const DexCompilationUnit* const dex_compilation_unit_;
DISALLOW_COPY_AND_ASSIGN(HGraphBuilder);
};
} // namespace art
#endif // ART_COMPILER_OPTIMIZING_BUILDER_H_
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