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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 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_
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