1/* 2 * Copyright (c) 2015, 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 24package java.lang.invoke; 25 26import java.lang.invoke.MethodHandles.Lookup; 27import jdk.internal.vm.annotation.DontInline; 28import jdk.internal.vm.annotation.ForceInline; 29/** 30 * Helper class to inject into java.lang.invoke that provides access to 31 * package-private methods in this package. 32 */ 33 34public class MethodHandleHelper { 35 36 private MethodHandleHelper() { } 37 38 public static final Lookup IMPL_LOOKUP = Lookup.IMPL_LOOKUP; 39 public static final Class<?> MHN_CALL_SITE_CONTEXT_CLASS 40 = MethodHandleNatives.CallSiteContext.class; 41 42 public static void customize(MethodHandle mh) { 43 mh.customize(); 44 } 45 46 @ForceInline 47 public static Object internalMemberName(MethodHandle mh) throws Throwable { 48 return mh.internalMemberName(); 49 } 50 51 @ForceInline 52 public static void linkToStatic(MethodHandle mh, float arg, Object name) throws Throwable { 53 MethodHandle.linkToStatic(mh, arg, name); 54 } 55 56 @ForceInline 57 public static void invokeBasicV(MethodHandle mh, float arg) throws Throwable { 58 mh.invokeBasic(arg); 59 } 60 61 @ForceInline 62 public static Object invokeBasicL(MethodHandle mh) throws Throwable { 63 return mh.invokeBasic(); 64 } 65 66 @ForceInline 67 public static int invokeBasicI(MethodHandle mh) throws Throwable { 68 return (int) mh.invokeBasic(); 69 } 70 71 public static MethodHandle varargsArray(int nargs) { 72 return MethodHandleImpl.varargsArray(nargs); 73 } 74 75 public static MethodHandle varargsArray(Class<?> arrayType, int nargs) { 76 return MethodHandleImpl.varargsArray(arrayType, nargs); 77 } 78 79 public static LambdaForm getLambdaForm(MethodHandle mh) { 80 return mh.form; 81 } 82 83 public static class NonInlinedReinvoker extends DelegatingMethodHandle { 84 private final MethodHandle target; 85 86 private NonInlinedReinvoker(MethodHandle target, LambdaForm lf) { 87 super(target.type(), lf); 88 this.target = target; 89 } 90 @Override 91 public MethodHandle getTarget() { 92 return target; 93 } 94 95 @Override 96 public MethodHandle asTypeUncached(MethodType newType) { 97 return asTypeCache = target.asType(newType); 98 } 99 100 public static MethodHandle make(MethodHandle target) { 101 LambdaForm lform = DelegatingMethodHandle.makeReinvokerForm( 102 target, -1, DelegatingMethodHandle.class, 103 /*forceInline=*/false, DelegatingMethodHandle.NF_getTarget, null); 104 return new NonInlinedReinvoker(target, lform); 105 } 106 } 107} 108