rev 14210 : 8154231: Simplify access to System properties from JDK code
Reviewed-by: rriggs

   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.util.Properties;

  29 import jdk.internal.misc.Unsafe;
  30 import sun.security.action.GetPropertyAction;
  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     static final boolean VAR_HANDLE_GUARDS;
  54 
  55     static {
  56         Properties props = GetPropertyAction.getProperties();
  57         DEBUG_METHOD_HANDLE_NAMES = Boolean.parseBoolean(
  58                 props.getProperty("java.lang.invoke.MethodHandle.DEBUG_NAMES"));
  59         DUMP_CLASS_FILES = Boolean.parseBoolean(
  60                 props.getProperty("java.lang.invoke.MethodHandle.DUMP_CLASS_FILES"));
  61         TRACE_INTERPRETER = Boolean.parseBoolean(
  62                 props.getProperty("java.lang.invoke.MethodHandle.TRACE_INTERPRETER"));
  63         TRACE_METHOD_LINKAGE = Boolean.parseBoolean(
  64                 props.getProperty("java.lang.invoke.MethodHandle.TRACE_METHOD_LINKAGE"));
  65         COMPILE_THRESHOLD = Integer.parseInt(
  66                 props.getProperty("java.lang.invoke.MethodHandle.COMPILE_THRESHOLD", "0"));
  67         DONT_INLINE_THRESHOLD = Integer.parseInt(
  68                 props.getProperty("java.lang.invoke.MethodHandle.DONT_INLINE_THRESHOLD", "30"));
  69         PROFILE_LEVEL = Integer.parseInt(
  70                 props.getProperty("java.lang.invoke.MethodHandle.PROFILE_LEVEL", "0"));
  71         PROFILE_GWT = Boolean.parseBoolean(
  72                 props.getProperty("java.lang.invoke.MethodHandle.PROFILE_GWT", "true"));
  73         CUSTOMIZE_THRESHOLD = Integer.parseInt(
  74                 props.getProperty("java.lang.invoke.MethodHandle.CUSTOMIZE_THRESHOLD", "127"));
  75         VAR_HANDLE_GUARDS = Boolean.parseBoolean(
  76                 props.getProperty("java.lang.invoke.VarHandle.VAR_HANDLE_GUARDS", "true"));





  77 
  78         if (CUSTOMIZE_THRESHOLD < -1 || CUSTOMIZE_THRESHOLD > 127) {
  79             throw newInternalError("CUSTOMIZE_THRESHOLD should be in [-1...127] range");
  80         }
  81     }
  82 
  83     /** Tell if any of the debugging switches are turned on.
  84      *  If this is the case, it is reasonable to perform extra checks or save extra information.
  85      */
  86     /*non-public*/ static boolean debugEnabled() {
  87         return (DEBUG_METHOD_HANDLE_NAMES |
  88                 DUMP_CLASS_FILES |
  89                 TRACE_INTERPRETER |
  90                 TRACE_METHOD_LINKAGE);
  91     }
  92 
  93     // handy shared exception makers (they simplify the common case code)
  94     /*non-public*/ static InternalError newInternalError(String message) {
  95         return new InternalError(message);
  96     }
  97     /*non-public*/ static InternalError newInternalError(String message, Throwable cause) {
  98         return new InternalError(message, cause);
  99     }
 100     /*non-public*/ static InternalError newInternalError(Throwable cause) {
 101         return new InternalError(cause);
 102     }
 103     /*non-public*/ static RuntimeException newIllegalStateException(String message) {
 104         return new IllegalStateException(message);
 105     }
 106     /*non-public*/ static RuntimeException newIllegalStateException(String message, Object obj) {
 107         return new IllegalStateException(message(message, obj));
 108     }
 109     /*non-public*/ static RuntimeException newIllegalArgumentException(String message) {
 110         return new IllegalArgumentException(message);
 111     }
 112     /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj) {
 113         return new IllegalArgumentException(message(message, obj));
 114     }
 115     /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj, Object obj2) {
 116         return new IllegalArgumentException(message(message, obj, obj2));
 117     }
 118     /** Propagate unchecked exceptions and errors, but wrap anything checked and throw that instead. */
 119     /*non-public*/ static Error uncaughtException(Throwable ex) {
 120         if (ex instanceof Error)  throw (Error) ex;
 121         if (ex instanceof RuntimeException)  throw (RuntimeException) ex;
 122         throw newInternalError("uncaught exception", ex);
 123     }
 124     private static String message(String message, Object obj) {
 125         if (obj != null)  message = message + ": " + obj;
 126         return message;
 127     }
 128     private static String message(String message, Object obj, Object obj2) {
 129         if (obj != null || obj2 != null)  message = message + ": " + obj + ", " + obj2;
 130         return message;
 131     }
 132 }
--- EOF ---