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/*
* Copyright (C) 2015 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_REFERENCE_TYPE_PROPAGATION_H_
#define ART_COMPILER_OPTIMIZING_REFERENCE_TYPE_PROPAGATION_H_
#include "driver/dex_compilation_unit.h"
#include "handle_scope-inl.h"
#include "nodes.h"
#include "optimization.h"
#include "optimizing_compiler_stats.h"
namespace art {
/**
* Propagates reference types to instructions.
*/
class ReferenceTypePropagation : public HOptimization {
public:
ReferenceTypePropagation(HGraph* graph,
const DexFile& dex_file,
const DexCompilationUnit& dex_compilation_unit,
StackHandleScopeCollection* handles)
: HOptimization(graph, true, "reference_type_propagation"),
dex_file_(dex_file),
dex_compilation_unit_(dex_compilation_unit),
handles_(handles),
worklist_(graph->GetArena(), kDefaultWorklistSize) {}
void Run() OVERRIDE;
private:
void VisitNewInstance(HNewInstance* new_instance);
void VisitLoadClass(HLoadClass* load_class);
void VisitPhi(HPhi* phi);
void VisitBasicBlock(HBasicBlock* block);
void UpdateBoundType(HBoundType* bound_type) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void UpdatePhi(HPhi* phi) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void BoundTypeForIfNotNull(HBasicBlock* block);
void BoundTypeForIfInstanceOf(HBasicBlock* block);
void ProcessWorklist();
void AddToWorklist(HInstruction* instr);
void AddDependentInstructionsToWorklist(HInstruction* instr);
bool UpdateNullability(HInstruction* instr);
bool UpdateReferenceTypeInfo(HInstruction* instr);
ReferenceTypeInfo MergeTypes(const ReferenceTypeInfo& a, const ReferenceTypeInfo& b)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
const DexFile& dex_file_;
const DexCompilationUnit& dex_compilation_unit_;
StackHandleScopeCollection* handles_;
GrowableArray<HInstruction*> worklist_;
static constexpr size_t kDefaultWorklistSize = 8;
DISALLOW_COPY_AND_ASSIGN(ReferenceTypePropagation);
};
} // namespace art
#endif // ART_COMPILER_OPTIMIZING_REFERENCE_TYPE_PROPAGATION_H_
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