Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/compiler/OopMapStream.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/compiler/OopMapStream.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,99 @@ +/* + * Copyright 2000 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +package sun.jvm.hotspot.compiler; + +import sun.jvm.hotspot.code.*; + +public class OopMapStream { + private CompressedReadStream stream; + private OopMap oopMap; + private int mask; + private int size; + private int position; + private OopMapValue omv; + private boolean omvValid; + + public OopMapStream(OopMap oopMap) { + this(oopMap, (OopMapValue.OopTypes[]) null); + } + + public OopMapStream(OopMap oopMap, OopMapValue.OopTypes type) { + this(oopMap, (OopMapValue.OopTypes[]) null); + mask = type.getValue(); + } + + public OopMapStream(OopMap oopMap, OopMapValue.OopTypes[] types) { + if (oopMap.getOMVData() == null) { + stream = new CompressedReadStream(oopMap.getWriteStream().getBuffer()); + } else { + stream = new CompressedReadStream(oopMap.getOMVData()); + } + mask = computeMask(types); + size = (int) oopMap.getOMVCount(); + position = 0; + omv = new OopMapValue(); + omvValid = false; + } + + public boolean isDone() { + if (!omvValid) { + findNext(); + } + return !omvValid; + } + + public void next() { + findNext(); + } + + public OopMapValue getCurrent() { + return omv; + } + + //-------------------------------------------------------------------------------- + // Internals only below this point + // + + private int computeMask(OopMapValue.OopTypes[] types) { + mask = 0; + if (types != null) { + for (int i = 0; i < types.length; i++) { + mask |= types[i].getValue(); + } + } + return mask; + } + + private void findNext() { + while (position++ < size) { + omv.readFrom(stream); + if ((omv.getType().getValue() & mask) > 0) { + omvValid = true; + return; + } + } + omvValid = false; + } +}