1 /* 2 * Copyright (c) 2006, 2017, 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 sun.jvm.hotspot.code; 26 27 import java.util.*; 28 29 import sun.jvm.hotspot.debugger.*; 30 import sun.jvm.hotspot.runtime.*; 31 import sun.jvm.hotspot.types.*; 32 import sun.jvm.hotspot.utilities.*; 33 34 public class VMRegImpl { 35 36 private static VMReg stack0; 37 private static int stack0Val; 38 private static Address stack0Addr; 39 private static AddressField regNameField; 40 private static int stackSlotSize; 41 42 static { 43 VM.registerVMInitializedObserver(new Observer() { 44 public void update(Observable o, Object data) { 45 initialize(VM.getVM().getTypeDataBase()); 46 } 47 }); 48 } 49 50 private static void initialize(TypeDataBase db) { 51 Type type = db.lookupType("VMRegImpl"); 52 AddressField stack0Field = type.getAddressField("stack0"); 53 stack0Addr = stack0Field.getValue(); 54 stack0Val = (int) stack0Addr.hashCode(); 55 stack0 = new VMReg(stack0Val); 56 regNameField = type.getAddressField("regName[0]"); 57 stackSlotSize = db.lookupIntConstant("VMRegImpl::stack_slot_size"); 58 } 59 60 public static VMReg getStack0() { 61 return stack0; 62 } 63 64 public static String getRegisterName(int index) { 65 if (Assert.ASSERTS_ENABLED) { 66 Assert.that(index >= 0 && index < stack0Val, "invalid index : " + index); 67 } 68 Address regName = regNameField.getStaticFieldAddress(); 69 long addrSize = VM.getVM().getAddressSize(); 70 return CStringUtilities.getString(regName.getAddressAt(index * addrSize)); 71 } 72 73 public static int getStackSlotSize() { 74 return stackSlotSize; 75 } 76 }