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