1 /*
2 * Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package org.openjdk.bench.java.lang.invoke;
26
27 import org.openjdk.jmh.annotations.Benchmark;
28 import org.openjdk.jmh.annotations.BenchmarkMode;
29 import org.openjdk.jmh.annotations.Mode;
30 import org.openjdk.jmh.annotations.OutputTimeUnit;
31 import org.openjdk.jmh.annotations.Scope;
32 import org.openjdk.jmh.annotations.State;
33
34 import java.lang.invoke.CallSite;
35 import java.lang.invoke.MethodHandle;
36 import java.lang.invoke.MethodHandles;
37 import java.lang.invoke.MethodType;
38 import java.lang.invoke.MutableCallSite;
39 import java.lang.invoke.VolatileCallSite;
40 import java.util.concurrent.TimeUnit;
41
42 /**
43 * This benchmark evaluates INDY performance under dynamic target updates.
44 */
45 @BenchmarkMode(Mode.AverageTime)
46 @OutputTimeUnit(TimeUnit.NANOSECONDS)
47 @State(Scope.Thread)
48 public class CallSiteSetTargetSelf {
49
50 /*
51 * Implementation notes:
52 * - This test makes sense for mutable and volatile call sites only
53 * - Multiple threads are calling the same callsite, and each call is swapping the target.
54 * - Additional baseline includes "raw" test, calling callsite's MH directly
55 *
56 * - NOTE: invalidating shared target callsite is very bad with multiple threads.
57 * I.e. this test is inherently non-scalable.
58 */
59
60 private static CallSite cs;
61
62 private static MethodHandle doCall1;
63 private static MethodHandle doCall2;
64
65 static {
66 try {
67 doCall1 = MethodHandles.lookup().findVirtual(CallSiteSetTargetSelf.class, "call1", MethodType.methodType(int.class));
68 doCall2 = MethodHandles.lookup().findVirtual(CallSiteSetTargetSelf.class, "call2", MethodType.methodType(int.class));
69 cs = new MutableCallSite(doCall1);
70 } catch (NoSuchMethodException | IllegalAccessException e) {
71 throw new IllegalStateException(e);
72 }
73 }
74
75 private int i1;
76 private int i2;
77
78 public int call1() {
79 cs.setTarget(doCall2);
80 return i1++;
81 }
82
83 public int call2() {
84 cs.setTarget(doCall1);
85 return i2++;
86 }
87
88 @Benchmark
89 public int baselineRaw() throws Throwable {
90 return (int) cs.getTarget().invokeExact(this);
91 }
92
93 @Benchmark
94 public int testMutable() throws Throwable {
95 return (int) INDY_Mutable().invokeExact(this);
96 }
97
98 @Benchmark
99 public int testVolatile() throws Throwable {
100 return (int) INDY_Volatile().invokeExact(this);
101 }
102
103 /* =========================== INDY TRAMPOLINES ============================== */
104
105 private static MethodType MT_bsm() {
106 shouldNotCallThis();
107 return MethodType.methodType(CallSite.class, MethodHandles.Lookup.class, String.class, MethodType.class);
108 }
109
110 private static MethodHandle MH_bsm_Mutable() throws ReflectiveOperationException {
111 shouldNotCallThis();
112 return MethodHandles.lookup().findStatic(MethodHandles.lookup().lookupClass(), "bsm_Mutable", MT_bsm());
113 }
114
115 private static MethodHandle MH_bsm_Volatile() throws ReflectiveOperationException {
116 shouldNotCallThis();
117 return MethodHandles.lookup().findStatic(MethodHandles.lookup().lookupClass(), "bsm_Volatile", MT_bsm());
118 }
119
120 private static MethodHandle INDY_Mutable() throws Throwable {
121 shouldNotCallThis();
122 return ((CallSite) MH_bsm_Mutable().invoke(MethodHandles.lookup(), "doCall1", MethodType.methodType(int.class, CallSiteSetTargetSelf.class))).dynamicInvoker();
123 }
124
125 private static MethodHandle INDY_Volatile() throws Throwable {
126 shouldNotCallThis();
127 return ((CallSite) MH_bsm_Volatile().invoke(MethodHandles.lookup(), "doCall1", MethodType.methodType(int.class, CallSiteSetTargetSelf.class))).dynamicInvoker();
128 }
129
130 public static CallSite bsm_Mutable(MethodHandles.Lookup lookup, String name, MethodType type) {
131 synchronized (CallSiteSetTarget.class) {
132 if (cs == null)
133 cs = new MutableCallSite(doCall1);
134 return cs;
135 }
136 }
137
138 public static CallSite bsm_Volatile(MethodHandles.Lookup lookup, String name, MethodType type) {
139 synchronized (CallSiteSetTarget.class) {
140 if (cs == null)
141 cs = new VolatileCallSite(doCall1);
142 return cs;
143 }
144 }
145
146 private static void shouldNotCallThis() {
147 // if this gets called, the transformation has not taken place
148 throw new AssertionError("this code should be statically transformed away by Indify");
149 }
150
151 }