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 final int PROFILE_LEVEL; 50 51 static { 52 final Object[] values = { false, false, false, false, null, null }; 53 AccessController.doPrivileged(new PrivilegedAction<Void>() { 54 public Void run() { 55 values[0] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DEBUG_NAMES"); 56 values[1] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DUMP_CLASS_FILES"); 57 values[2] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_INTERPRETER"); 58 values[3] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_METHOD_LINKAGE"); 59 values[4] = Integer.getInteger("java.lang.invoke.MethodHandle.COMPILE_THRESHOLD"); 60 values[5] = Integer.getInteger("java.lang.invoke.MethodHandle.PROFILE_LEVEL", 0); 61 62 return null; 63 } 64 }); 65 DEBUG_METHOD_HANDLE_NAMES = (Boolean) values[0]; 66 DUMP_CLASS_FILES = (Boolean) values[1]; 67 TRACE_INTERPRETER = (Boolean) values[2]; 68 TRACE_METHOD_LINKAGE = (Boolean) values[3]; 69 COMPILE_THRESHOLD = (Integer) values[4]; 70 PROFILE_LEVEL = (Integer) values[5]; 71 } 72 73 /** Tell if any of the debugging switches are turned on. 74 * If this is the case, it is reasonable to perform extra checks or save extra information. 75 */ 76 /*non-public*/ static boolean debugEnabled() { 77 return (DEBUG_METHOD_HANDLE_NAMES | 78 DUMP_CLASS_FILES | 79 TRACE_INTERPRETER | 80 TRACE_METHOD_LINKAGE); 81 } 82 83 /*non-public*/ static String getNameString(MethodHandle target, MethodType type) { 84 if (type == null) 85 type = target.type(); 86 MemberName name = null; 87 if (target != null) 88 name = target.internalMemberName(); 89 if (name == null) 90 return "invoke" + type; 91 return name.getName() + type; 92 } 93 94 /*non-public*/ static String getNameString(MethodHandle target, MethodHandle typeHolder) { 95 return getNameString(target, typeHolder == null ? (MethodType) null : typeHolder.type()); 96 } 97 98 /*non-public*/ static String getNameString(MethodHandle target) { 99 return getNameString(target, (MethodType) null); 100 } 101 102 /*non-public*/ static String addTypeString(Object obj, MethodHandle target) { 103 String str = String.valueOf(obj); 104 if (target == null) return str; 105 int paren = str.indexOf('('); 106 if (paren >= 0) str = str.substring(0, paren); 107 return str + target.type(); 108 } 109 110 // handy shared exception makers (they simplify the common case code) 111 /*non-public*/ static InternalError newInternalError(String message) { 112 return new InternalError(message); 113 } 114 /*non-public*/ static InternalError newInternalError(String message, Throwable cause) { 115 return new InternalError(message, cause); 116 } 117 /*non-public*/ static InternalError newInternalError(Throwable cause) { 118 return new InternalError(cause); 119 } 120 /*non-public*/ static RuntimeException newIllegalStateException(String message) { 121 return new IllegalStateException(message); 122 } 123 /*non-public*/ static RuntimeException newIllegalStateException(String message, Object obj) { 124 return new IllegalStateException(message(message, obj)); 125 } 126 /*non-public*/ static RuntimeException newIllegalArgumentException(String message) { 127 return new IllegalArgumentException(message); 128 } 129 /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj) { 130 return new IllegalArgumentException(message(message, obj)); 131 } 132 /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj, Object obj2) { 133 return new IllegalArgumentException(message(message, obj, obj2)); 134 } 135 /*non-public*/ static Error uncaughtException(Throwable ex) { 136 throw newInternalError("uncaught exception", ex); 137 } 138 static Error NYI() { 139 throw new AssertionError("NYI"); 140 } 141 private static String message(String message, Object obj) { 142 if (obj != null) message = message + ": " + obj; 143 return message; 144 } 145 private static String message(String message, Object obj, Object obj2) { 146 if (obj != null || obj2 != null) message = message + ": " + obj + ", " + obj2; 147 return message; 148 } 149 }