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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_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 DexCompilationUnit;
class CodeAllocator {
public:
CodeAllocator() { }
virtual ~CodeAllocator() { }
virtual uint8_t* Allocate(size_t size) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(CodeAllocator);
};
struct PcInfo {
uint32_t dex_pc;
uintptr_t native_pc;
};
/**
* 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->GetBlock()->GetGraph()->GetArena(), instruction->InputCount()),
temps(instruction->GetBlock()->GetGraph()->GetArena(), 0) {
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);
}
void AddTemp(Location location) {
temps.Add(location);
}
Location GetTemp(uint32_t at) const {
return temps.Get(at);
}
Location Out() const { return output; }
private:
GrowableArray<Location> inputs;
GrowableArray<Location> temps;
Location output;
DISALLOW_COPY_AND_ASSIGN(LocationSummary);
};
class CodeGenerator : public ArenaObject {
public:
// Compiles the graph to executable instructions. Returns whether the compilation
// succeeded.
void Compile(CodeAllocator* allocator);
static CodeGenerator* Create(ArenaAllocator* allocator,
HGraph* graph,
InstructionSet instruction_set);
HGraph* GetGraph() const { return graph_; }
Label* GetLabelOf(HBasicBlock* block) const;
bool GoesToNextBlock(HBasicBlock* current, HBasicBlock* next) const;
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;
virtual HGraphVisitor* GetInstructionVisitor() = 0;
virtual Assembler* GetAssembler() = 0;
uint32_t GetFrameSize() const { return frame_size_; }
void SetFrameSize(uint32_t size) { frame_size_ = size; }
uint32_t GetCoreSpillMask() const { return core_spill_mask_; }
void RecordPcInfo(uint32_t dex_pc) {
struct PcInfo pc_info;
pc_info.dex_pc = dex_pc;
pc_info.native_pc = GetAssembler()->CodeSize();
pc_infos_.Add(pc_info);
}
void BuildMappingTable(std::vector<uint8_t>* vector) const;
void BuildVMapTable(std::vector<uint8_t>* vector) const;
void BuildNativeGCMap(
std::vector<uint8_t>* vector, const DexCompilationUnit& dex_compilation_unit) const;
protected:
explicit CodeGenerator(HGraph* graph)
: frame_size_(0),
graph_(graph),
block_labels_(graph->GetArena(), 0),
pc_infos_(graph->GetArena(), 32) {
block_labels_.SetSize(graph->GetBlocks()->Size());
}
~CodeGenerator() { }
// Frame size required for this method.
uint32_t frame_size_;
uint32_t core_spill_mask_;
private:
void InitLocations(HInstruction* instruction);
void CompileBlock(HBasicBlock* block);
void CompileEntryBlock();
HGraph* const graph_;
// Labels for each block that will be compiled.
GrowableArray<Label> block_labels_;
GrowableArray<PcInfo> pc_infos_;
DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
};
} // namespace art
#endif // ART_COMPILER_OPTIMIZING_CODE_GENERATOR_H_
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