1 /* 2 * Copyright (c) 2000, 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 sun.jvm.hotspot.code.*; 28 29 public class OopMapStream { 30 private CompressedReadStream stream; 31 private OopMap oopMap; 32 private int mask; 33 private int size; 34 private int position; 35 private OopMapValue omv; 36 private boolean omvValid; 37 38 public OopMapStream(OopMap oopMap) { 39 this(oopMap, (OopMapValue.OopTypes[]) null); 40 } 41 42 public OopMapStream(OopMap oopMap, OopMapValue.OopTypes type) { 43 this(oopMap, (OopMapValue.OopTypes[]) null); 44 mask = type.getValue(); 45 } 46 47 public OopMapStream(OopMap oopMap, OopMapValue.OopTypes[] types) { 48 if (oopMap.getOMVData() == null) { 49 stream = new CompressedReadStream(oopMap.getWriteStream().getBuffer()); 50 } else { 51 stream = new CompressedReadStream(oopMap.getOMVData()); 52 } 53 mask = computeMask(types); 54 size = (int) oopMap.getOMVCount(); 55 position = 0; 56 omv = new OopMapValue(); 57 omvValid = false; 58 } 59 60 public boolean isDone() { 61 if (!omvValid) { 62 findNext(); 63 } 64 return !omvValid; 65 } 66 67 public void next() { 68 findNext(); 69 } 70 71 public OopMapValue getCurrent() { 72 return omv; 73 } 74 75 //-------------------------------------------------------------------------------- 76 // Internals only below this point 77 // 78 79 private int computeMask(OopMapValue.OopTypes[] types) { 80 mask = 0; 81 if (types != null) { 82 for (int i = 0; i < types.length; i++) { 83 mask |= types[i].getValue(); 84 } 85 } 86 return mask; 87 } 88 89 private void findNext() { 90 while (position++ < size) { 91 omv.readFrom(stream); 92 if ((omv.getType().getValue() & mask) > 0) { 93 omvValid = true; 94 return; 95 } 96 } 97 omvValid = false; 98 } 99 }