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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 "base/bit_field.h"
#include "globals.h"
#include "instruction_set.h"
#include "locations.h"
#include "memory_region.h"
#include "nodes.h"
#include "utils/assembler.h"
namespace art {
static size_t constexpr kVRegSize = 4;
static size_t constexpr kUninitializedFrameSize = 0;
class CodeGenerator;
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;
};
class SlowPathCode : public ArenaObject {
public:
SlowPathCode() : entry_label_(), exit_label_() {}
virtual ~SlowPathCode() {}
Label* GetEntryLabel() { return &entry_label_; }
Label* GetExitLabel() { return &exit_label_; }
virtual void EmitNativeCode(CodeGenerator* codegen) = 0;
private:
Label entry_label_;
Label exit_label_;
DISALLOW_COPY_AND_ASSIGN(SlowPathCode);
};
class CodeGenerator : public ArenaObject {
public:
// Compiles the graph to executable instructions. Returns whether the compilation
// succeeded.
void CompileBaseline(CodeAllocator* allocator);
void CompileOptimized(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;
size_t GetStackSlotOfParameter(HParameterValue* parameter) const {
// Note that this follows the current calling convention.
return GetFrameSize()
+ kVRegSize // Art method
+ parameter->GetIndex() * kVRegSize;
}
virtual void GenerateFrameEntry() = 0;
virtual void GenerateFrameExit() = 0;
virtual void Bind(Label* label) = 0;
virtual void Move(HInstruction* instruction, Location location, HInstruction* move_for) = 0;
virtual HGraphVisitor* GetLocationBuilder() = 0;
virtual HGraphVisitor* GetInstructionVisitor() = 0;
virtual Assembler* GetAssembler() = 0;
virtual size_t GetWordSize() const = 0;
void ComputeFrameSize(size_t number_of_spill_slots);
virtual size_t FrameEntrySpillSize() const = 0;
int32_t GetStackSlot(HLocal* local) const;
Location GetTemporaryLocation(HTemporary* temp) const;
uint32_t GetFrameSize() const { return frame_size_; }
void SetFrameSize(uint32_t size) { frame_size_ = size; }
uint32_t GetCoreSpillMask() const { return core_spill_mask_; }
virtual size_t GetNumberOfCoreRegisters() const = 0;
virtual size_t GetNumberOfFloatingPointRegisters() const = 0;
virtual size_t GetNumberOfRegisters() const = 0;
virtual void SetupBlockedRegisters(bool* blocked_registers) const = 0;
virtual void DumpCoreRegister(std::ostream& stream, int reg) const = 0;
virtual void DumpFloatingPointRegister(std::ostream& stream, int reg) const = 0;
virtual InstructionSet GetInstructionSet() const = 0;
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 AddSlowPath(SlowPathCode* slow_path) {
slow_paths_.Add(slow_path);
}
void GenerateSlowPaths();
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:
CodeGenerator(HGraph* graph, size_t number_of_registers)
: frame_size_(kUninitializedFrameSize),
graph_(graph),
block_labels_(graph->GetArena(), 0),
pc_infos_(graph->GetArena(), 32),
slow_paths_(graph->GetArena(), 8),
blocked_registers_(graph->GetArena()->AllocArray<bool>(number_of_registers)) {}
~CodeGenerator() {}
// Register allocation logic.
void AllocateRegistersLocally(HInstruction* instruction) const;
// Backend specific implementation for allocating a register.
virtual ManagedRegister AllocateFreeRegister(Primitive::Type type,
bool* blocked_registers) const = 0;
// Raw implementation of allocating a register: loops over blocked_registers to find
// the first available register.
size_t AllocateFreeRegisterInternal(bool* blocked_registers, size_t number_of_registers) const;
virtual Location GetStackLocation(HLoadLocal* load) const = 0;
// Frame size required for this method.
uint32_t frame_size_;
uint32_t core_spill_mask_;
private:
void InitLocations(HInstruction* instruction);
HGraph* const graph_;
// Labels for each block that will be compiled.
GrowableArray<Label> block_labels_;
GrowableArray<PcInfo> pc_infos_;
GrowableArray<SlowPathCode*> slow_paths_;
// Temporary data structure used when doing register allocation.
bool* const blocked_registers_;
DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
};
template <typename T>
class CallingConvention {
public:
CallingConvention(const T* registers, int number_of_registers)
: registers_(registers), number_of_registers_(number_of_registers) {}
size_t GetNumberOfRegisters() const { return number_of_registers_; }
T GetRegisterAt(size_t index) const {
DCHECK_LT(index, number_of_registers_);
return registers_[index];
}
uint8_t GetStackOffsetOf(size_t index) const {
// We still reserve the space for parameters passed by registers.
// Add one for the method pointer.
return (index + 1) * kVRegSize;
}
private:
const T* registers_;
const size_t number_of_registers_;
DISALLOW_COPY_AND_ASSIGN(CallingConvention);
};
} // namespace art
#endif // ART_COMPILER_OPTIMIZING_CODE_GENERATOR_H_
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