| /* |
| * 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_CODE_GENERATOR_H_ |
| #define ART_COMPILER_OPTIMIZING_CODE_GENERATOR_H_ |
| |
| #include "globals.h" |
| #include "instruction_set.h" |
| #include "memory_region.h" |
| #include "nodes.h" |
| #include "utils/assembler.h" |
| |
| namespace art { |
| |
| class CodeAllocator { |
| public: |
| CodeAllocator() { } |
| virtual ~CodeAllocator() { } |
| |
| virtual uint8_t* Allocate(size_t size) = 0; |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(CodeAllocator); |
| }; |
| |
| /** |
| * A Location is an abstraction over the potential location |
| * of an instruction. It could be in register or stack. |
| */ |
| class Location : public ValueObject { |
| public: |
| template<typename T> |
| T reg() const { return static_cast<T>(reg_); } |
| |
| Location() : reg_(kInvalid) { } |
| explicit Location(uword reg) : reg_(reg) { } |
| |
| static Location RegisterLocation(uword reg) { |
| return Location(reg); |
| } |
| |
| bool IsValid() const { return reg_ != kInvalid; } |
| |
| Location(const Location& other) : reg_(other.reg_) { } |
| |
| Location& operator=(const Location& other) { |
| reg_ = other.reg_; |
| return *this; |
| } |
| |
| private: |
| // The target register for that location. |
| // TODO: Support stack location. |
| uword reg_; |
| static const uword kInvalid = -1; |
| }; |
| |
| /** |
| * The code generator computes LocationSummary for each instruction so that |
| * the instruction itself knows what code to generate: where to find the inputs |
| * and where to place the result. |
| * |
| * The intent is to have the code for generating the instruction independent of |
| * register allocation. A register allocator just has to provide a LocationSummary. |
| */ |
| class LocationSummary : public ArenaObject { |
| public: |
| explicit LocationSummary(HInstruction* instruction) |
| : inputs(instruction->block()->graph()->arena(), instruction->InputCount()) { |
| inputs.SetSize(instruction->InputCount()); |
| for (int i = 0; i < instruction->InputCount(); i++) { |
| inputs.Put(i, Location()); |
| } |
| } |
| |
| void SetInAt(uint32_t at, Location location) { |
| inputs.Put(at, location); |
| } |
| |
| Location InAt(uint32_t at) const { |
| return inputs.Get(at); |
| } |
| |
| void SetOut(Location location) { |
| output = Location(location); |
| } |
| |
| Location Out() const { return output; } |
| |
| private: |
| GrowableArray<Location> inputs; |
| Location output; |
| |
| DISALLOW_COPY_AND_ASSIGN(LocationSummary); |
| }; |
| |
| class CodeGenerator : public HGraphVisitor { |
| public: |
| // Compiles the graph to executable instructions. Returns whether the compilation |
| // succeeded. |
| static bool CompileGraph(HGraph* graph, InstructionSet instruction_set, CodeAllocator* allocator); |
| |
| Assembler* assembler() const { return assembler_; } |
| |
| // Visit functions for instruction classes. |
| #define DECLARE_VISIT_INSTRUCTION(name) \ |
| virtual void Visit##name(H##name* instr) = 0; |
| |
| FOR_EACH_INSTRUCTION(DECLARE_VISIT_INSTRUCTION) |
| |
| #undef DECLARE_VISIT_INSTRUCTION |
| |
| protected: |
| CodeGenerator(Assembler* assembler, HGraph* graph) |
| : HGraphVisitor(graph), |
| frame_size_(0), |
| assembler_(assembler), |
| block_labels_(graph->arena(), 0) { |
| block_labels_.SetSize(graph->blocks()->Size()); |
| } |
| |
| Label* GetLabelOf(HBasicBlock* block) const; |
| bool GoesToNextBlock(HBasicBlock* current, HBasicBlock* next) const; |
| |
| // Frame size required for this method. |
| uint32_t frame_size_; |
| |
| virtual void GenerateFrameEntry() = 0; |
| virtual void GenerateFrameExit() = 0; |
| virtual void Bind(Label* label) = 0; |
| virtual void Move(HInstruction* instruction, Location location) = 0; |
| virtual void Push(HInstruction* instruction, Location location) = 0; |
| virtual HGraphVisitor* GetLocationBuilder() = 0; |
| |
| private: |
| void InitLocations(HInstruction* instruction); |
| void Compile(CodeAllocator* allocator); |
| void CompileBlock(HBasicBlock* block); |
| void CompileEntryBlock(); |
| |
| Assembler* const assembler_; |
| |
| // Labels for each block that will be compiled. |
| GrowableArray<Label> block_labels_; |
| |
| DISALLOW_COPY_AND_ASSIGN(CodeGenerator); |
| }; |
| |
| } // namespace art |
| |
| #endif // ART_COMPILER_OPTIMIZING_CODE_GENERATOR_H_ |