1 /* 2 * Copyright (c) 2000, 2004, 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.compiler; 26 27 import java.util.*; 28 29 import sun.jvm.hotspot.code.*; 30 import sun.jvm.hotspot.debugger.*; 31 import sun.jvm.hotspot.runtime.*; 32 import sun.jvm.hotspot.types.*; 33 34 public class OopMap extends VMObject { 35 private static CIntegerField pcOffsetField; 36 private static CIntegerField omvCountField; 37 private static CIntegerField omvDataSizeField; 38 private static AddressField omvDataField; 39 private static AddressField compressedWriteStreamField; 40 41 // This is actually a field inside class CompressedStream 42 private static AddressField compressedStreamBufferField; 43 44 static { 45 VM.registerVMInitializedObserver(new Observer() { 46 public void update(Observable o, Object data) { 47 initialize(VM.getVM().getTypeDataBase()); 48 } 49 }); 50 } 51 52 private static void initialize(TypeDataBase db) { 53 Type type = db.lookupType("OopMap"); 54 55 pcOffsetField = type.getCIntegerField("_pc_offset"); 56 omvCountField = type.getCIntegerField("_omv_count"); 57 omvDataSizeField = type.getCIntegerField("_omv_data_size"); 58 omvDataField = type.getAddressField("_omv_data"); 59 compressedWriteStreamField = type.getAddressField("_write_stream"); 60 61 type = db.lookupType("CompressedStream"); 62 compressedStreamBufferField = type.getAddressField("_buffer"); 63 } 64 65 public OopMap(Address addr) { 66 super(addr); 67 } 68 69 public long getOffset() { 70 return pcOffsetField.getValue(addr); 71 } 72 73 //-------------------------------------------------------------------------------- 74 // Internals only below this point 75 // 76 77 // Accessors -- package private for now 78 Address getOMVData() { 79 return omvDataField.getValue(addr); 80 } 81 82 long getOMVDataSize() { 83 return omvDataSizeField.getValue(addr); 84 } 85 86 long getOMVCount() { 87 return omvCountField.getValue(addr); 88 } 89 90 CompressedWriteStream getWriteStream() { 91 Address wsAddr = compressedWriteStreamField.getValue(addr); 92 if (wsAddr == null) { 93 return null; 94 } 95 Address bufferAddr = compressedStreamBufferField.getValue(wsAddr); 96 if (bufferAddr == null) { 97 return null; 98 } 99 return new CompressedWriteStream(bufferAddr); 100 } 101 }