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1 /*
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2 * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.code;
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26
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27 import java.util.*;
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28
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29 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.runtime.*;
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31 import sun.jvm.hotspot.types.*;
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32 import sun.jvm.hotspot.utilities.*;
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33
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34 public class VMRegImpl {
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35
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36 private static VMReg stack0;
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37 private static int stack0Val;
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38 private static Address stack0Addr;
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39 private static AddressField regNameField;
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40
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41 static {
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42 VM.registerVMInitializedObserver(new Observer() {
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43 public void update(Observable o, Object data) {
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44 initialize(VM.getVM().getTypeDataBase());
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45 }
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46 });
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47 }
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48
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49 private static void initialize(TypeDataBase db) {
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50 Type type = db.lookupType("VMRegImpl");
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51 AddressField stack0Field = type.getAddressField("stack0");
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52 stack0Addr = stack0Field.getValue();
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53 stack0Val = (int) stack0Addr.hashCode();
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54 stack0 = new VMReg(stack0Val);
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55 regNameField = type.getAddressField("regName[0]");
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56 }
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57
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58 public static VMReg getStack0() {
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59 return stack0;
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60 }
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61
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62 public static String getRegisterName(int index) {
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63 if (Assert.ASSERTS_ENABLED) {
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64 Assert.that(index >= 0 && index < stack0Val, "invalid index : " + index);
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65 }
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66 Address regName = regNameField.getStaticFieldAddress();
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67 long addrSize = VM.getVM().getAddressSize();
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68 return CStringUtilities.getString(regName.getAddressAt(index * addrSize));
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69 }
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70 }
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