FieldAccessBenchmark.java revision 5a7833b406bb2716b057d3ed923f22f1f86b2a20 
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
17package benchmarks;
18
19import com.google.caliper.Param;
20import com.google.caliper.Runner;
21import com.google.caliper.SimpleBenchmark;
22
23/**
24 * What does field access cost?
25 */
26public class FieldAccessBenchmark extends SimpleBenchmark {
27    private static class Inner {
28        public int publicInnerIntVal;
29        protected int protectedInnerIntVal;
30        private int privateInnerIntVal;
31        int packageInnerIntVal;
32    }
33    int intVal = 42;
34    final int finalIntVal = 42;
35    static int staticIntVal = 42;
36    static final int staticFinalIntVal = 42;
37    public int timeField(int reps) {
38        int result = 0;
39        for (int rep = 0; rep < reps; ++rep) {
40            result = intVal;
41        }
42        return result;
43    }
44    public int timeFieldFinal(int reps) {
45        int result = 0;
46        for (int rep = 0; rep < reps; ++rep) {
47            result = finalIntVal;
48        }
49        return result;
50    }
51    public int timeFieldStatic(int reps) {
52        int result = 0;
53        for (int rep = 0; rep < reps; ++rep) {
54            result = staticIntVal;
55        }
56        return result;
57    }
58    public int timeFieldStaticFinal(int reps) {
59        int result = 0;
60        for (int rep = 0; rep < reps; ++rep) {
61            result = staticFinalIntVal;
62        }
63        return result;
64    }
65    public int timeFieldCached(int reps) {
66        int result = 0;
67        int cachedIntVal = this.intVal;
68        for (int rep = 0; rep < reps; ++rep) {
69            result = cachedIntVal;
70        }
71        return result;
72    }
73    public int timeFieldPrivateInnerClassPublicField(int reps) {
74        int result = 0;
75        Inner inner = new Inner();
76        for (int rep = 0; rep < reps; ++rep) {
77            result = inner.publicInnerIntVal;
78        }
79        return result;
80    }
81    public int timeFieldPrivateInnerClassProtectedField(int reps) {
82        int result = 0;
83        Inner inner = new Inner();
84        for (int rep = 0; rep < reps; ++rep) {
85            result = inner.protectedInnerIntVal;
86        }
87        return result;
88    }
89    public int timeFieldPrivateInnerClassPrivateField(int reps) {
90        int result = 0;
91        Inner inner = new Inner();
92        for (int rep = 0; rep < reps; ++rep) {
93            result = inner.privateInnerIntVal;
94        }
95        return result;
96    }
97    public int timeFieldPrivateInnerClassPackageField(int reps) {
98        int result = 0;
99        Inner inner = new Inner();
100        for (int rep = 0; rep < reps; ++rep) {
101            result = inner.packageInnerIntVal;
102        }
103        return result;
104    }
105}
106