1 /* 2 * Copyright (c) 2012, 2018, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 package org.graalvm.compiler.replacements; 26 27 import java.lang.reflect.Field; 28 29 import sun.misc.Unsafe; 30 31 /** 32 * Package private access to the {@link Unsafe} capability. 33 */ 34 class UnsafeAccess { 35 36 private static final Unsafe THE_UNSAFE = initUnsafe(); 37 38 static final UnsafeAccess UNSAFE = new UnsafeAccess(); 39 40 private static Unsafe initUnsafe() { 41 try { 42 // Fast path when we are trusted. 43 return Unsafe.getUnsafe(); 44 } catch (SecurityException se) { 45 // Slow path when we are not trusted. 46 try { 47 Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe"); 48 theUnsafe.setAccessible(true); 49 return (Unsafe) theUnsafe.get(Unsafe.class); 50 } catch (Exception e) { 51 throw new RuntimeException("exception while trying to get Unsafe", e); 52 } 53 } 54 } 55 56 public char getChar(Object target, long l) { 57 return THE_UNSAFE.getChar(target, l); 58 } 59 60 public byte getByte(Object target, long l) { 61 return THE_UNSAFE.getByte(target, l); 62 } 63 }