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 boolean USE_LAMBDA_FORM_EDITOR;
  49     static final int COMPILE_THRESHOLD;
  50     static final int DONT_INLINE_THRESHOLD;
  51     static final int PROFILE_LEVEL;
  52 
  53     static {
  54         final Object[] values = new Object[8];
  55         AccessController.doPrivileged(new PrivilegedAction<Void>() {
  56                 public Void run() {
  57                     values[0] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DEBUG_NAMES");
  58                     values[1] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DUMP_CLASS_FILES");
  59                     values[2] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_INTERPRETER");
  60                     values[3] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_METHOD_LINKAGE");
  61                     values[4] = Boolean.getBoolean("java.lang.invoke.MethodHandle.USE_LF_EDITOR");
  62                     values[5] = Integer.getInteger("java.lang.invoke.MethodHandle.COMPILE_THRESHOLD", 30);
  63                     values[6] = Integer.getInteger("java.lang.invoke.MethodHandle.DONT_INLINE_THRESHOLD", 30);
  64                     values[7] = Integer.getInteger("java.lang.invoke.MethodHandle.PROFILE_LEVEL", 0);
  65                     return null;
  66                 }
  67             });
  68         DEBUG_METHOD_HANDLE_NAMES = (Boolean) values[0];
  69         DUMP_CLASS_FILES          = (Boolean) values[1];
  70         TRACE_INTERPRETER         = (Boolean) values[2];
  71         TRACE_METHOD_LINKAGE      = (Boolean) values[3];
  72         USE_LAMBDA_FORM_EDITOR    = (Boolean) values[4];
  73         COMPILE_THRESHOLD         = (Integer) values[5];
  74         DONT_INLINE_THRESHOLD     = (Integer) values[6];
  75         PROFILE_LEVEL             = (Integer) values[7];
  76     }
  77 
  78     /** Tell if any of the debugging switches are turned on.
  79      *  If this is the case, it is reasonable to perform extra checks or save extra information.
  80      */
  81     /*non-public*/ static boolean debugEnabled() {
  82         return (DEBUG_METHOD_HANDLE_NAMES |
  83                 DUMP_CLASS_FILES |
  84                 TRACE_INTERPRETER |
  85                 TRACE_METHOD_LINKAGE);
  86     }
  87 
  88     /*non-public*/ static String getNameString(MethodHandle target, MethodType type) {
  89         if (type == null)
  90             type = target.type();
  91         MemberName name = null;
  92         if (target != null)
  93             name = target.internalMemberName();
  94         if (name == null)
  95             return "invoke" + type;
  96         return name.getName() + type;
  97     }
  98 
  99     /*non-public*/ static String getNameString(MethodHandle target, MethodHandle typeHolder) {
 100         return getNameString(target, typeHolder == null ? (MethodType) null : typeHolder.type());
 101     }
 102 
 103     /*non-public*/ static String getNameString(MethodHandle target) {
 104         return getNameString(target, (MethodType) null);
 105     }
 106 
 107     /*non-public*/ static String addTypeString(Object obj, MethodHandle target) {
 108         String str = String.valueOf(obj);
 109         if (target == null)  return str;
 110         int paren = str.indexOf('(');
 111         if (paren >= 0) str = str.substring(0, paren);
 112         return str + target.type();
 113     }
 114 
 115     // handy shared exception makers (they simplify the common case code)
 116     /*non-public*/ static InternalError newInternalError(String message) {
 117         return new InternalError(message);
 118     }
 119     /*non-public*/ static InternalError newInternalError(String message, Throwable cause) {
 120         return new InternalError(message, cause);
 121     }
 122     /*non-public*/ static InternalError newInternalError(Throwable cause) {
 123         return new InternalError(cause);
 124     }
 125     /*non-public*/ static RuntimeException newIllegalStateException(String message) {
 126         return new IllegalStateException(message);
 127     }
 128     /*non-public*/ static RuntimeException newIllegalStateException(String message, Object obj) {
 129         return new IllegalStateException(message(message, obj));
 130     }
 131     /*non-public*/ static RuntimeException newIllegalArgumentException(String message) {
 132         return new IllegalArgumentException(message);
 133     }
 134     /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj) {
 135         return new IllegalArgumentException(message(message, obj));
 136     }
 137     /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj, Object obj2) {
 138         return new IllegalArgumentException(message(message, obj, obj2));
 139     }
 140     /** Propagate unchecked exceptions and errors, but wrap anything checked and throw that instead. */
 141     /*non-public*/ static Error uncaughtException(Throwable ex) {
 142         if (ex instanceof Error)  throw (Error) ex;
 143         if (ex instanceof RuntimeException)  throw (RuntimeException) ex;
 144         throw newInternalError("uncaught exception", ex);
 145     }
 146     static Error NYI() {
 147         throw new AssertionError("NYI");
 148     }
 149     private static String message(String message, Object obj) {
 150         if (obj != null)  message = message + ": " + obj;
 151         return message;
 152     }
 153     private static String message(String message, Object obj, Object obj2) {
 154         if (obj != null || obj2 != null)  message = message + ": " + obj + ", " + obj2;
 155         return message;
 156     }
 157 }