1 /* 2 * Copyright (c) 2011, 2012, 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.AccessController; 29 import java.security.PrivilegedAction; 30 import sun.misc.Unsafe; 31 32 /** 33 * This class consists exclusively of static names internal to the 34 * method handle implementation. 35 * Usage: {@code import static java.lang.invoke.MethodHandleStatics.*} 36 * @author John Rose, JSR 292 EG 37 */ 38 /*non-public*/ class MethodHandleStatics { 39 40 private MethodHandleStatics() { } // do not instantiate 41 42 static final Unsafe UNSAFE = Unsafe.getUnsafe(); 43 44 static final boolean DEBUG_METHOD_HANDLE_NAMES; 45 static final boolean DUMP_CLASS_FILES; 46 static final boolean TRACE_INTERPRETER; 47 static final boolean TRACE_METHOD_LINKAGE; 48 static final Integer COMPILE_THRESHOLD; 49 static { 50 final Object[] values = { false, false, false, false, null }; 51 AccessController.doPrivileged(new PrivilegedAction<Void>() { 52 public Void run() { 53 values[0] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DEBUG_NAMES"); 54 values[1] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DUMP_CLASS_FILES"); 55 values[2] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_INTERPRETER"); 56 values[3] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_METHOD_LINKAGE"); 57 values[4] = Integer.getInteger("java.lang.invoke.MethodHandle.COMPILE_THRESHOLD"); 58 return null; 59 } 60 }); 61 DEBUG_METHOD_HANDLE_NAMES = (Boolean) values[0]; 62 DUMP_CLASS_FILES = (Boolean) values[1]; 63 TRACE_INTERPRETER = (Boolean) values[2]; 64 TRACE_METHOD_LINKAGE = (Boolean) values[3]; 65 COMPILE_THRESHOLD = (Integer) values[4]; 66 } 67 68 /** Tell if any of the debugging switches are turned on. 69 * If this is the case, it is reasonable to perform extra checks or save extra information. 70 */ 71 /*non-public*/ static boolean debugEnabled() { 72 return (DEBUG_METHOD_HANDLE_NAMES | 73 DUMP_CLASS_FILES | 74 TRACE_INTERPRETER | 75 TRACE_METHOD_LINKAGE); 76 } 77 78 /*non-public*/ static String getNameString(MethodHandle target, MethodType type) { 79 if (type == null) 80 type = target.type(); 81 MemberName name = null; 82 if (target != null) 83 name = target.internalMemberName(); 84 if (name == null) 85 return "invoke" + type; 86 return name.getName() + type; 87 } 88 89 /*non-public*/ static String getNameString(MethodHandle target, MethodHandle typeHolder) { 90 return getNameString(target, typeHolder == null ? (MethodType) null : typeHolder.type()); 91 } 92 93 /*non-public*/ static String getNameString(MethodHandle target) { 94 return getNameString(target, (MethodType) null); 95 } 96 97 /*non-public*/ static String addTypeString(Object obj, MethodHandle target) { 98 String str = String.valueOf(obj); 99 if (target == null) return str; 100 int paren = str.indexOf('('); 101 if (paren >= 0) str = str.substring(0, paren); 102 return str + target.type(); 103 } 104 105 // handy shared exception makers (they simplify the common case code) 106 /*non-public*/ static InternalError newInternalError(String message) { 107 return new InternalError(message); 108 } 109 /*non-public*/ static InternalError newInternalError(String message, Throwable cause) { 110 return new InternalError(message, cause); 111 } 112 /*non-public*/ static InternalError newInternalError(Throwable cause) { 113 return new InternalError(cause); 114 } 115 /*non-public*/ static RuntimeException newIllegalStateException(String message) { 116 return new IllegalStateException(message); 117 } 118 /*non-public*/ static RuntimeException newIllegalStateException(String message, Object obj) { 119 return new IllegalStateException(message(message, obj)); 120 } 121 /*non-public*/ static RuntimeException newIllegalArgumentException(String message) { 122 return new IllegalArgumentException(message); 123 } 124 /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj) { 125 return new IllegalArgumentException(message(message, obj)); 126 } 127 /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj, Object obj2) { 128 return new IllegalArgumentException(message(message, obj, obj2)); 129 } 130 /*non-public*/ static Error uncaughtException(Throwable ex) { 131 throw newInternalError("uncaught exception", ex); 132 } 133 static Error NYI() { 134 throw new AssertionError("NYI"); 135 } 136 private static String message(String message, Object obj) { 137 if (obj != null) message = message + ": " + obj; 138 return message; 139 } 140 private static String message(String message, Object obj, Object obj2) { 141 if (obj != null || obj2 != null) message = message + ": " + obj + ", " + obj2; 142 return message; 143 } 144 }