rev 12972 : 8140606: Update library code to use internal Unsafe
Reviewed-by: duke

   1 /*
   2  * Copyright (c) 2011, 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.  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 int COMPILE_THRESHOLD;
  49     static final int DONT_INLINE_THRESHOLD;
  50     static final int PROFILE_LEVEL;
  51     static final boolean PROFILE_GWT;
  52     static final int CUSTOMIZE_THRESHOLD;
  53 
  54     static {
  55         final Object[] values = new Object[9];
  56         AccessController.doPrivileged(new PrivilegedAction<>() {
  57                 public Void run() {
  58                     values[0] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DEBUG_NAMES");
  59                     values[1] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DUMP_CLASS_FILES");
  60                     values[2] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_INTERPRETER");
  61                     values[3] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_METHOD_LINKAGE");
  62                     values[4] = Integer.getInteger("java.lang.invoke.MethodHandle.COMPILE_THRESHOLD", 0);
  63                     values[5] = Integer.getInteger("java.lang.invoke.MethodHandle.DONT_INLINE_THRESHOLD", 30);
  64                     values[6] = Integer.getInteger("java.lang.invoke.MethodHandle.PROFILE_LEVEL", 0);
  65                     values[7] = Boolean.parseBoolean(System.getProperty("java.lang.invoke.MethodHandle.PROFILE_GWT", "true"));
  66                     values[8] = Integer.getInteger("java.lang.invoke.MethodHandle.CUSTOMIZE_THRESHOLD", 127);
  67                     return null;
  68                 }
  69             });
  70         DEBUG_METHOD_HANDLE_NAMES = (Boolean) values[0];
  71         DUMP_CLASS_FILES          = (Boolean) values[1];
  72         TRACE_INTERPRETER         = (Boolean) values[2];
  73         TRACE_METHOD_LINKAGE      = (Boolean) values[3];
  74         COMPILE_THRESHOLD         = (Integer) values[4];
  75         DONT_INLINE_THRESHOLD     = (Integer) values[5];
  76         PROFILE_LEVEL             = (Integer) values[6];
  77         PROFILE_GWT               = (Boolean) values[7];
  78         CUSTOMIZE_THRESHOLD       = (Integer) values[8];
  79 
  80         if (CUSTOMIZE_THRESHOLD < -1 || CUSTOMIZE_THRESHOLD > 127) {
  81             throw newInternalError("CUSTOMIZE_THRESHOLD should be in [-1...127] range");
  82         }
  83     }
  84 
  85     /** Tell if any of the debugging switches are turned on.
  86      *  If this is the case, it is reasonable to perform extra checks or save extra information.
  87      */
  88     /*non-public*/ static boolean debugEnabled() {
  89         return (DEBUG_METHOD_HANDLE_NAMES |
  90                 DUMP_CLASS_FILES |
  91                 TRACE_INTERPRETER |
  92                 TRACE_METHOD_LINKAGE);
  93     }
  94 
  95     /*non-public*/ static String getNameString(MethodHandle target, MethodType type) {
  96         if (type == null)
  97             type = target.type();
  98         MemberName name = null;
  99         if (target != null)
 100             name = target.internalMemberName();
 101         if (name == null)
 102             return "invoke" + type;
 103         return name.getName() + type;
 104     }
 105 
 106     /*non-public*/ static String getNameString(MethodHandle target, MethodHandle typeHolder) {
 107         return getNameString(target, typeHolder == null ? (MethodType) null : typeHolder.type());
 108     }
 109 
 110     /*non-public*/ static String getNameString(MethodHandle target) {
 111         return getNameString(target, (MethodType) null);
 112     }
 113 
 114     /*non-public*/ static String addTypeString(Object obj, MethodHandle target) {
 115         String str = String.valueOf(obj);
 116         if (target == null)  return str;
 117         int paren = str.indexOf('(');
 118         if (paren >= 0) str = str.substring(0, paren);
 119         return str + target.type();
 120     }
 121 
 122     // handy shared exception makers (they simplify the common case code)
 123     /*non-public*/ static InternalError newInternalError(String message) {
 124         return new InternalError(message);
 125     }
 126     /*non-public*/ static InternalError newInternalError(String message, Throwable cause) {
 127         return new InternalError(message, cause);
 128     }
 129     /*non-public*/ static InternalError newInternalError(Throwable cause) {
 130         return new InternalError(cause);
 131     }
 132     /*non-public*/ static RuntimeException newIllegalStateException(String message) {
 133         return new IllegalStateException(message);
 134     }
 135     /*non-public*/ static RuntimeException newIllegalStateException(String message, Object obj) {
 136         return new IllegalStateException(message(message, obj));
 137     }
 138     /*non-public*/ static RuntimeException newIllegalArgumentException(String message) {
 139         return new IllegalArgumentException(message);
 140     }
 141     /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj) {
 142         return new IllegalArgumentException(message(message, obj));
 143     }
 144     /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj, Object obj2) {
 145         return new IllegalArgumentException(message(message, obj, obj2));
 146     }
 147     /** Propagate unchecked exceptions and errors, but wrap anything checked and throw that instead. */
 148     /*non-public*/ static Error uncaughtException(Throwable ex) {
 149         if (ex instanceof Error)  throw (Error) ex;
 150         if (ex instanceof RuntimeException)  throw (RuntimeException) ex;
 151         throw newInternalError("uncaught exception", ex);
 152     }
 153     static Error NYI() {
 154         throw new AssertionError("NYI");
 155     }
 156     private static String message(String message, Object obj) {
 157         if (obj != null)  message = message + ": " + obj;
 158         return message;
 159     }
 160     private static String message(String message, Object obj, Object obj2) {
 161         if (obj != null || obj2 != null)  message = message + ": " + obj + ", " + obj2;
 162         return message;
 163     }
 164 }
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