1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ART_COMPILER_OPTIMIZING_CONSTANT_FOLDING_H_
18#define ART_COMPILER_OPTIMIZING_CONSTANT_FOLDING_H_
19
20#include "nodes.h"
21#include "optimization.h"
22
23namespace art {
24
25/**
26 * Optimization pass performing a simple constant-expression
27 * evaluation on the SSA form.
28 *
29 * Note that graph simplifications producing a constant should be
30 * implemented in art::HConstantFolding, while graph simplifications
31 * not producing constants should be implemented in
32 * art::InstructionSimplifier.  (This convention is a choice that was
33 * made during the development of these parts of the compiler and is
34 * not bound by any technical requirement.)
35 *
36 * This class is named art::HConstantFolding to avoid name
37 * clashes with the art::ConstantPropagation class defined in
38 * compiler/dex/post_opt_passes.h.
39 */
40class HConstantFolding : public HOptimization {
41 public:
42  HConstantFolding(HGraph* graph, const char* name = kConstantFoldingPassName)
43      : HOptimization(graph, name) {}
44
45  void Run() OVERRIDE;
46
47  static constexpr const char* kConstantFoldingPassName = "constant_folding";
48
49 private:
50  DISALLOW_COPY_AND_ASSIGN(HConstantFolding);
51};
52
53}  // namespace art
54
55#endif  // ART_COMPILER_OPTIMIZING_CONSTANT_FOLDING_H_
56