1 /*
   2  * Copyright (c) 2011, 2013, 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 package com.apple.jobjc;
  26 
  27 import java.lang.reflect.Field;
  28 import java.nio.ByteOrder;
  29 import java.util.ArrayList;
  30 import java.util.List;
  31 
  32 import sun.misc.Unsafe;
  33 
  34 
  35 public final class JObjCRuntime {
  36     static { System.loadLibrary("JObjC"); }
  37 
  38     public static enum Arch{ ppc, i386, x86_64 };
  39     public static enum Width{ W32, W64 };
  40 
  41     public static final Arch ARCH = getArch();
  42     public static final Width WIDTH = getWidth();
  43 
  44     private static Arch getArch(){
  45         String arch = System.getProperty("os.arch");
  46         if("ppc".equals(arch)) return Arch.ppc;
  47         if("i386".equals(arch)) return Arch.i386;
  48         if("x86_64".equals(arch)) return Arch.x86_64;
  49         if("amd64".equals(arch)) return Arch.x86_64;
  50         if("universal".equals(arch)) return Arch.x86_64;
  51         throw new RuntimeException("Did not recognize os.arch system property: '" + arch + "'");
  52     }
  53 
  54     private static Width getWidth(){
  55         String width = System.getProperty("sun.arch.data.model");
  56         if("32".equals(width)) return Width.W32;
  57         if("64".equals(width)) return Width.W64;
  58         throw new RuntimeException("Did not recognize sun.arch.data.model system property: '" + width + "'");
  59     }
  60 
  61     public static final boolean IS32 = System.getProperty("sun.arch.data.model").equals("32");
  62     public static final boolean IS64 = System.getProperty("sun.arch.data.model").equals("64");
  63     public static final int PTR_LEN = IS64 ? 8 : 4;
  64     public static final boolean IS_BIG_ENDIAN = ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN;
  65     static final boolean DEBUG = Boolean.parseBoolean(System.getProperty("JObjC.debug"));
  66 
  67     static void checkPermission(){
  68         final SecurityManager security = System.getSecurityManager();
  69         if (security != null) security.checkPermission(new RuntimePermission("canProcessApplicationEvents"));
  70     }
  71 
  72     public final void assertOK(){
  73         if(this != instance)
  74             throw new SecurityException("runtime");
  75     }
  76 
  77     private JObjCRuntime(){}
  78 
  79     private static JObjCRuntime instance;
  80     static JObjCRuntime inst() {
  81         if (instance == null) instance = new JObjCRuntime();
  82         return instance;
  83     }
  84 
  85     public static JObjCRuntime getInstance() {
  86         checkPermission();
  87         return inst();
  88     }
  89 
  90     public final NativeArgumentBuffer getThreadLocalState() {
  91         return NativeArgumentBuffer.getThreadLocalBuffer(this);
  92     }
  93 
  94     final Unsafe unsafe = getUnsafe();
  95     final Subclassing subclassing = new Subclassing(this);
  96     final List<String> registeredPackages = new ArrayList<String>();
  97 
  98     @SuppressWarnings("unchecked")
  99     Class<? extends ID> getClassForNativeClassName(final String className) {
 100         for (final String pkg : registeredPackages) {
 101             try {
 102                 final Class<?> clazz = Class.forName(pkg + "." + className);
 103                 if (clazz != null) return (Class<? extends ID>)clazz;
 104             } catch (final ClassNotFoundException e) { }
 105         }
 106 
 107         return null;
 108     }
 109 
 110     private final static Unsafe getUnsafe() {
 111         Unsafe inst = null;
 112         try {
 113             Field f = Unsafe.class.getDeclaredField("theUnsafe");
 114             f.setAccessible(true);
 115             inst = (Unsafe) f.get(null);
 116             if(inst == null) throw new NullPointerException("Unsafe.theUnsafe == null");
 117         } catch (Exception e) {
 118             throw new RuntimeException("Unable to get instance of Unsafe.", e);
 119         }
 120         return inst;
 121     }
 122 
 123     public void registerPackage(final String pkg) {
 124         registeredPackages.add(pkg);
 125     }
 126 
 127     /**
 128      * Register a subclass of NSObject to allow the native side to send
 129      * messages which in turn call java methods declared on the class.
 130      * If a native class by the same name already exists, registerClass
 131      * will simply return without doing anything.
 132      *
 133      * For a usage example, see the SubclassingTest.
 134      */
 135     public boolean registerUserClass(Class<? extends ID> clazz, Class<? extends NSClass> clazzClazz) {
 136         return subclassing.registerUserClass(clazz, clazzClazz);
 137     }
 138 
 139 }