1 /* 2 * Copyright (c) 2020 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.jdk.incubator.foreign; 24 25 import jdk.incubator.foreign.CSupport; 26 import jdk.incubator.foreign.FunctionDescriptor; 27 import jdk.incubator.foreign.LibraryLookup; 28 import jdk.incubator.foreign.ForeignLinker; 29 import org.openjdk.jmh.annotations.Benchmark; 30 import org.openjdk.jmh.annotations.BenchmarkMode; 31 import org.openjdk.jmh.annotations.Fork; 32 import org.openjdk.jmh.annotations.Measurement; 33 import org.openjdk.jmh.annotations.Mode; 34 import org.openjdk.jmh.annotations.OutputTimeUnit; 35 import org.openjdk.jmh.annotations.State; 36 import org.openjdk.jmh.annotations.Warmup; 37 38 import java.lang.invoke.MethodHandle; 39 import java.lang.invoke.MethodType; 40 import java.util.concurrent.TimeUnit; 41 42 import static jdk.incubator.foreign.CSupport.C_INT; 43 44 @BenchmarkMode(Mode.AverageTime) 45 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS) 46 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS) 47 @State(org.openjdk.jmh.annotations.Scope.Thread) 48 @OutputTimeUnit(TimeUnit.NANOSECONDS) 49 @Fork(3) 50 public class CallOverhead { 51 52 static final ForeignLinker abi = CSupport.getSystemLinker(); 53 static final MethodHandle func; 54 static final MethodHandle identity; 55 56 static { 57 System.loadLibrary("CallOverheadJNI"); 58 59 try { 60 LibraryLookup ll = LibraryLookup.ofLibrary("CallOverhead"); 61 func = abi.downcallHandle(ll.lookup("func"), 62 MethodType.methodType(void.class), 63 FunctionDescriptor.ofVoid()); 64 identity = abi.downcallHandle(ll.lookup("identity"), 65 MethodType.methodType(int.class, int.class), 66 FunctionDescriptor.of(C_INT, C_INT)); 67 } catch (NoSuchMethodException e) { 68 throw new BootstrapMethodError(e); 69 } 70 } 71 72 static native void blank(); 73 static native int identity(int x); 74 75 @Benchmark 76 public void jni_blank() throws Throwable { 77 blank(); 78 } 79 80 @Benchmark 81 public void panama_blank() throws Throwable { 82 func.invokeExact(); 83 } 84 85 @Benchmark 86 public int jni_identity() throws Throwable { 87 return identity(10); 88 } 89 90 @Benchmark 91 public int panama_identity() throws Throwable { 92 return (int) identity.invokeExact(10); 93 } 94 }