code_generator.h revision ffddfdf6fec0b9d98a692e27242eecb15af5ead2
1/* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef ART_COMPILER_OPTIMIZING_CODE_GENERATOR_H_ 18#define ART_COMPILER_OPTIMIZING_CODE_GENERATOR_H_ 19 20#include "base/bit_field.h" 21#include "globals.h" 22#include "instruction_set.h" 23#include "locations.h" 24#include "memory_region.h" 25#include "nodes.h" 26#include "utils/assembler.h" 27 28namespace art { 29 30static size_t constexpr kVRegSize = 4; 31 32class DexCompilationUnit; 33 34class CodeAllocator { 35 public: 36 CodeAllocator() { } 37 virtual ~CodeAllocator() { } 38 39 virtual uint8_t* Allocate(size_t size) = 0; 40 41 private: 42 DISALLOW_COPY_AND_ASSIGN(CodeAllocator); 43}; 44 45struct PcInfo { 46 uint32_t dex_pc; 47 uintptr_t native_pc; 48}; 49 50class CodeGenerator : public ArenaObject { 51 public: 52 // Compiles the graph to executable instructions. Returns whether the compilation 53 // succeeded. 54 void Compile(CodeAllocator* allocator); 55 static CodeGenerator* Create(ArenaAllocator* allocator, 56 HGraph* graph, 57 InstructionSet instruction_set); 58 59 HGraph* GetGraph() const { return graph_; } 60 61 Label* GetLabelOf(HBasicBlock* block) const; 62 bool GoesToNextBlock(HBasicBlock* current, HBasicBlock* next) const; 63 64 virtual void GenerateFrameEntry() = 0; 65 virtual void GenerateFrameExit() = 0; 66 virtual void Bind(Label* label) = 0; 67 virtual void Move(HInstruction* instruction, Location location, HInstruction* move_for) = 0; 68 virtual HGraphVisitor* GetLocationBuilder() = 0; 69 virtual HGraphVisitor* GetInstructionVisitor() = 0; 70 virtual Assembler* GetAssembler() = 0; 71 virtual size_t GetWordSize() const = 0; 72 73 uint32_t GetFrameSize() const { return frame_size_; } 74 void SetFrameSize(uint32_t size) { frame_size_ = size; } 75 uint32_t GetCoreSpillMask() const { return core_spill_mask_; } 76 77 virtual size_t GetNumberOfCoreRegisters() const = 0; 78 virtual size_t GetNumberOfFloatingPointRegisters() const = 0; 79 virtual size_t GetNumberOfRegisters() const = 0; 80 virtual void SetupBlockedRegisters(bool* blocked_registers) const = 0; 81 virtual void DumpCoreRegister(std::ostream& stream, int reg) const = 0; 82 virtual void DumpFloatingPointRegister(std::ostream& stream, int reg) const = 0; 83 84 void RecordPcInfo(uint32_t dex_pc) { 85 struct PcInfo pc_info; 86 pc_info.dex_pc = dex_pc; 87 pc_info.native_pc = GetAssembler()->CodeSize(); 88 pc_infos_.Add(pc_info); 89 } 90 91 void BuildMappingTable(std::vector<uint8_t>* vector) const; 92 void BuildVMapTable(std::vector<uint8_t>* vector) const; 93 void BuildNativeGCMap( 94 std::vector<uint8_t>* vector, const DexCompilationUnit& dex_compilation_unit) const; 95 96 protected: 97 CodeGenerator(HGraph* graph, size_t number_of_registers) 98 : frame_size_(0), 99 graph_(graph), 100 block_labels_(graph->GetArena(), 0), 101 pc_infos_(graph->GetArena(), 32), 102 blocked_registers_(graph->GetArena()->AllocArray<bool>(number_of_registers)) { 103 block_labels_.SetSize(graph->GetBlocks().Size()); 104 } 105 ~CodeGenerator() { } 106 107 // Register allocation logic. 108 void AllocateRegistersLocally(HInstruction* instruction) const; 109 110 // Backend specific implementation for allocating a register. 111 virtual ManagedRegister AllocateFreeRegister(Primitive::Type type, 112 bool* blocked_registers) const = 0; 113 114 // Raw implementation of allocating a register: loops over blocked_registers to find 115 // the first available register. 116 size_t AllocateFreeRegisterInternal(bool* blocked_registers, size_t number_of_registers) const; 117 118 virtual Location GetStackLocation(HLoadLocal* load) const = 0; 119 120 // Frame size required for this method. 121 uint32_t frame_size_; 122 uint32_t core_spill_mask_; 123 124 private: 125 void InitLocations(HInstruction* instruction); 126 void CompileBlock(HBasicBlock* block); 127 128 HGraph* const graph_; 129 130 // Labels for each block that will be compiled. 131 GrowableArray<Label> block_labels_; 132 GrowableArray<PcInfo> pc_infos_; 133 134 // Temporary data structure used when doing register allocation. 135 bool* const blocked_registers_; 136 137 DISALLOW_COPY_AND_ASSIGN(CodeGenerator); 138}; 139 140template <typename T> 141class CallingConvention { 142 public: 143 CallingConvention(const T* registers, int number_of_registers) 144 : registers_(registers), number_of_registers_(number_of_registers) {} 145 146 size_t GetNumberOfRegisters() const { return number_of_registers_; } 147 148 T GetRegisterAt(size_t index) const { 149 DCHECK_LT(index, number_of_registers_); 150 return registers_[index]; 151 } 152 153 uint8_t GetStackOffsetOf(size_t index, size_t word_size) const { 154 // We still reserve the space for parameters passed by registers. 155 // Add word_size for the method pointer. 156 return index * kVRegSize + word_size; 157 } 158 159 private: 160 const T* registers_; 161 const size_t number_of_registers_; 162 163 DISALLOW_COPY_AND_ASSIGN(CallingConvention); 164}; 165 166} // namespace art 167 168#endif // ART_COMPILER_OPTIMIZING_CODE_GENERATOR_H_ 169