1 /* 2 * Copyright (c) 2012, 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 26 package java.lang.invoke; 27 28 import java.security.*; 29 import java.lang.reflect.*; 30 import java.lang.invoke.MethodHandleNatives.Constants; 31 import java.lang.invoke.MethodHandles.Lookup; 32 import static java.lang.invoke.MethodHandleStatics.*; 33 34 /* 35 * Auxiliary to MethodHandleInfo, wants to nest in MethodHandleInfo but must be non-public. 36 */ 37 /*non-public*/ 38 final 39 class InfoFromMemberName implements MethodHandleInfo { 40 private final MemberName member; 41 private final int referenceKind; 42 43 InfoFromMemberName(Lookup lookup, MemberName member, byte referenceKind) { 44 assert(member.isResolved() || member.isMethodHandleInvoke()); 45 assert(member.referenceKindIsConsistentWith(referenceKind)); 46 this.member = member; 47 this.referenceKind = referenceKind; 48 } 49 50 @Override 51 public Class<?> getDeclaringClass() { 52 return member.getDeclaringClass(); 53 } 54 55 @Override 56 public String getName() { 57 return member.getName(); 58 } 59 60 @Override 61 public MethodType getMethodType() { 62 return member.getMethodOrFieldType(); 63 } 64 65 @Override 66 public int getModifiers() { 67 return member.getModifiers(); 68 } 69 70 @Override 71 public int getReferenceKind() { 72 return referenceKind; 73 } 74 75 @Override 76 public String toString() { 77 return MethodHandleInfo.toString(getReferenceKind(), getDeclaringClass(), getName(), getMethodType()); 78 } 79 80 @Override 81 public <T extends Member> T reflectAs(Class<T> expected, Lookup lookup) { 82 if (member.isMethodHandleInvoke() && !member.isVarargs()) { 83 // This member is an instance of a signature-polymorphic method, which cannot be reflected 84 // A method handle invoker can come in either of two forms: 85 // A generic placeholder (present in the source code, and varargs) 86 // and a signature-polymorphic instance (synthetic and not varargs). 87 // For more information see comments on {@link MethodHandleNatives#linkMethod}. 88 throw new IllegalArgumentException("cannot reflect signature polymorphic method"); 89 } 90 Member mem = AccessController.doPrivileged(new PrivilegedAction<Member>() { 91 public Member run() { 92 try { 93 return reflectUnchecked(); 94 } catch (ReflectiveOperationException ex) { 95 throw new IllegalArgumentException(ex); 96 } 97 } 98 }); 99 try { 100 Class<?> defc = getDeclaringClass(); 101 byte refKind = (byte) getReferenceKind(); 102 lookup.checkAccess(refKind, defc, convertToMemberName(refKind, mem)); 103 } catch (IllegalAccessException ex) { 104 throw new IllegalArgumentException(ex); 105 } 106 return expected.cast(mem); 107 } 108 109 private Member reflectUnchecked() throws ReflectiveOperationException { 110 byte refKind = (byte) getReferenceKind(); 111 Class<?> defc = getDeclaringClass(); 112 boolean isPublic = Modifier.isPublic(getModifiers()); 113 if (MethodHandleNatives.refKindIsMethod(refKind)) { 114 if (isPublic) 115 return defc.getMethod(getName(), getMethodType().parameterArray()); 116 else 117 return defc.getDeclaredMethod(getName(), getMethodType().parameterArray()); 118 } else if (MethodHandleNatives.refKindIsConstructor(refKind)) { 119 if (isPublic) 120 return defc.getConstructor(getMethodType().parameterArray()); 121 else 122 return defc.getDeclaredConstructor(getMethodType().parameterArray()); 123 } else if (MethodHandleNatives.refKindIsField(refKind)) { 124 if (isPublic) 125 return defc.getField(getName()); 126 else 127 return defc.getDeclaredField(getName()); 128 } else { 129 throw new IllegalArgumentException("referenceKind="+refKind); 130 } 131 } 132 133 private static MemberName convertToMemberName(byte refKind, Member mem) throws IllegalAccessException { 134 if (mem instanceof Method) { 135 boolean wantSpecial = (refKind == REF_invokeSpecial); 136 return MemberName.make((Method) mem, wantSpecial); 137 } else if (mem instanceof Constructor) { 138 return MemberName.make((Constructor) mem); 139 } else if (mem instanceof Field) { 140 boolean isSetter = (refKind == REF_putField || refKind == REF_putStatic); 141 return MemberName.make((Field) mem, isSetter); 142 } 143 throw new InternalError(mem.getClass().getName()); 144 } 145 }