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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_OPTIMIZATION_H_
#define ART_COMPILER_OPTIMIZING_OPTIMIZATION_H_
#include "base/arena_object.h"
#include "base/macros.h"
#include "nodes.h"
#include "optimizing_compiler_stats.h"
namespace art HIDDEN {
class CodeGenerator;
class DexCompilationUnit;
/**
* Abstraction to implement an optimization pass.
*/
class HOptimization : public ArenaObject<kArenaAllocOptimization> {
public:
HOptimization(HGraph* graph,
const char* pass_name,
OptimizingCompilerStats* stats = nullptr)
: graph_(graph),
stats_(stats),
pass_name_(pass_name) {}
virtual ~HOptimization() {}
// Return the name of the pass. Pass names for a single HOptimization should be of form
// <optimization_name> or <optimization_name>$<pass_name> for common <optimization_name> prefix.
// Example: 'instruction_simplifier', 'instruction_simplifier$before_codegen',
// 'instruction_simplifier$before_codegen'.
const char* GetPassName() const { return pass_name_; }
// Perform the pass or analysis. Returns false if no optimizations occurred or no useful
// information was computed (this is best effort, returning true is always ok).
virtual bool Run() = 0;
protected:
HGraph* const graph_;
// Used to record stats about the optimization.
OptimizingCompilerStats* const stats_;
private:
// Optimization pass name.
const char* pass_name_;
DISALLOW_COPY_AND_ASSIGN(HOptimization);
};
// Optimization passes that can be constructed by the helper method below. An enum
// field is preferred over a string lookup at places where performance matters.
// TODO: generate this table and lookup methods below automatically?
enum class OptimizationPass {
kAggressiveConstantFolding,
kAggressiveInstructionSimplifier,
kBoundsCheckElimination,
kCHAGuardOptimization,
kCodeSinking,
kConstantFolding,
kConstructorFenceRedundancyElimination,
kDeadCodeElimination,
kGlobalValueNumbering,
kInductionVarAnalysis,
kInliner,
kInstructionSimplifier,
kInvariantCodeMotion,
kLoadStoreElimination,
kLoopOptimization,
kScheduling,
kSelectGenerator,
kSideEffectsAnalysis,
kWriteBarrierElimination,
#ifdef ART_ENABLE_CODEGEN_arm
kInstructionSimplifierArm,
kCriticalNativeAbiFixupArm,
#endif
#ifdef ART_ENABLE_CODEGEN_arm64
kInstructionSimplifierArm64,
#endif
#ifdef ART_ENABLE_CODEGEN_x86
kPcRelativeFixupsX86,
kInstructionSimplifierX86,
#endif
#ifdef ART_ENABLE_CODEGEN_x86_64
kInstructionSimplifierX86_64,
#endif
#if defined(ART_ENABLE_CODEGEN_x86) || defined(ART_ENABLE_CODEGEN_x86_64)
kX86MemoryOperandGeneration,
#endif
kNone,
kLast = kNone
};
// Lookup name of optimization pass.
const char* OptimizationPassName(OptimizationPass pass);
// Lookup optimization pass by name.
OptimizationPass OptimizationPassByName(const std::string& pass_name);
// Optimization definition consisting of an optimization pass
// an optional alternative name (nullptr denotes default), and
// an optional pass dependence (kNone denotes no dependence).
struct OptimizationDef {
OptimizationDef(OptimizationPass p, const char* pn, OptimizationPass d)
: pass(p), pass_name(pn), depends_on(d) {}
OptimizationPass pass;
const char* pass_name;
OptimizationPass depends_on;
};
// Helper method for optimization definition array entries.
inline OptimizationDef OptDef(OptimizationPass pass,
const char* pass_name = nullptr,
OptimizationPass depends_on = OptimizationPass::kNone) {
return OptimizationDef(pass, pass_name, depends_on);
}
// Helper method to construct series of optimization passes.
// The array should consist of the requested optimizations
// and optional alternative names for repeated passes.
// Example:
// { OptPass(kConstantFolding),
// OptPass(Inliner),
// OptPass(kConstantFolding, "constant_folding$after_inlining")
// }
ArenaVector<HOptimization*> ConstructOptimizations(
const OptimizationDef definitions[],
size_t length,
ArenaAllocator* allocator,
HGraph* graph,
OptimizingCompilerStats* stats,
CodeGenerator* codegen,
const DexCompilationUnit& dex_compilation_unit);
} // namespace art
#endif // ART_COMPILER_OPTIMIZING_OPTIMIZATION_H_
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