Optimizer.h revision dcf3e5d43a1831a166f70cb9e0694cd4b0b356b0 
1/*
2 * Copyright (C) 2009 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 _DALVIK_VM_COMPILER_OPTIMIZATION_H
18#define _DALVIK_VM_COMPILER_OPTIMIZATION_H
19
20#include "Dalvik.h"
21
22/*
23 * If the corresponding bit is set in gDvmJit.disableOpt, the selected
24 * optimization will be suppressed.
25 */
26typedef enum optControlVector {
27    kLoadStoreElimination = 0,
28    kLoadHoisting,
29} optControlVector;
30
31/* Forward declarations */
32struct CompilationUnit;
33struct LIR;
34
35/*
36 * Data structure tracking the mapping between a Dalvik register (pair) and a
37 * native register (pair). The idea is to reuse the previously loaded value
38 * if possible, otherwise to keep the value in a native register as long as
39 * possible.
40 */
41typedef struct RegisterScoreboard {
42    BitVector *nullCheckedRegs; // Track which registers have been null-checked
43    int liveDalvikReg;          // Track which Dalvik register is live
44    int nativeReg;              // And the mapped native register
45    int nativeRegHi;            // And the mapped native register
46    bool isWide;                // Whether a pair of registers are alive
47} RegisterScoreboard;
48
49void dvmCompilerApplyLocalOptimizations(struct CompilationUnit *cUnit,
50                                        struct LIR *head,
51                                        struct LIR *tail);
52
53void dvmCompilerApplyGlobalOptimizations(struct CompilationUnit *cUnit);
54
55#endif /* _DALVIK_VM_COMPILER_OPTIMIZATION_H */
56