1 /* 2 * Copyright (C) 2010 Google Inc. 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 package benchmarks; 18 19 /** 20 * What does field access cost? 21 */ 22 public class FieldAccessBenchmark { 23 private static class Inner { 24 public int publicInnerIntVal; 25 protected int protectedInnerIntVal; 26 private int privateInnerIntVal; 27 int packageInnerIntVal; 28 } 29 int intVal = 42; 30 final int finalIntVal = 42; 31 static int staticIntVal = 42; 32 static final int staticFinalIntVal = 42; 33 public int timeField(int reps) { 34 int result = 0; 35 for (int rep = 0; rep < reps; ++rep) { 36 result = intVal; 37 } 38 return result; 39 } 40 public int timeFieldFinal(int reps) { 41 int result = 0; 42 for (int rep = 0; rep < reps; ++rep) { 43 result = finalIntVal; 44 } 45 return result; 46 } 47 public int timeFieldStatic(int reps) { 48 int result = 0; 49 for (int rep = 0; rep < reps; ++rep) { 50 result = staticIntVal; 51 } 52 return result; 53 } 54 public int timeFieldStaticFinal(int reps) { 55 int result = 0; 56 for (int rep = 0; rep < reps; ++rep) { 57 result = staticFinalIntVal; 58 } 59 return result; 60 } 61 public int timeFieldCached(int reps) { 62 int result = 0; 63 int cachedIntVal = this.intVal; 64 for (int rep = 0; rep < reps; ++rep) { 65 result = cachedIntVal; 66 } 67 return result; 68 } 69 public int timeFieldPrivateInnerClassPublicField(int reps) { 70 int result = 0; 71 Inner inner = new Inner(); 72 for (int rep = 0; rep < reps; ++rep) { 73 result = inner.publicInnerIntVal; 74 } 75 return result; 76 } 77 public int timeFieldPrivateInnerClassProtectedField(int reps) { 78 int result = 0; 79 Inner inner = new Inner(); 80 for (int rep = 0; rep < reps; ++rep) { 81 result = inner.protectedInnerIntVal; 82 } 83 return result; 84 } 85 public int timeFieldPrivateInnerClassPrivateField(int reps) { 86 int result = 0; 87 Inner inner = new Inner(); 88 for (int rep = 0; rep < reps; ++rep) { 89 result = inner.privateInnerIntVal; 90 } 91 return result; 92 } 93 public int timeFieldPrivateInnerClassPackageField(int reps) { 94 int result = 0; 95 Inner inner = new Inner(); 96 for (int rep = 0; rep < reps; ++rep) { 97 result = inner.packageInnerIntVal; 98 } 99 return result; 100 } 101 } 102
