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 ImmutableOopMap 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(ImmutableOopMap oopMap) { 39 this(oopMap, (OopMapValue.OopTypes[]) null); 40 } 41 42 public OopMapStream(ImmutableOopMap oopMap, OopMapValue.OopTypes type) { 43 this(oopMap, (OopMapValue.OopTypes[]) null); 44 mask = type.getValue(); 45 } 46 47 public OopMapStream(ImmutableOopMap oopMap, OopMapValue.OopTypes[] types) { 48 stream = new CompressedReadStream(oopMap.getData()); 49 mask = computeMask(types); 50 size = (int) oopMap.getCount(); 51 position = 0; 52 omv = new OopMapValue(); 53 omvValid = false; 54 } 55 56 public boolean isDone() { 57 if (!omvValid) { 58 findNext(); 59 } 60 return !omvValid; 61 } 62 63 public void next() { 64 findNext(); 65 } 66 67 public OopMapValue getCurrent() { 68 return omv; 69 } 70 71 //-------------------------------------------------------------------------------- 72 // Internals only below this point 73 // 74 75 private int computeMask(OopMapValue.OopTypes[] types) { 76 mask = 0; 77 if (types != null) { 78 for (int i = 0; i < types.length; i++) { 79 mask |= types[i].getValue(); 80 } 81 } 82 return mask; 83 } 84 85 private void findNext() { 86 while (position++ < size) { 87 omv.readFrom(stream); 88 if ((omv.getType().getValue() & mask) > 0) { 89 omvValid = true; 90 return; 91 } 92 } 93 omvValid = false; 94 } 95 }