Mercurial > hg > graal-jvmci-8
diff agent/src/share/classes/sun/jvm/hotspot/memory/CodeHeap.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/memory/CodeHeap.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,145 @@ +/* + * Copyright 2000-2004 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.memory; + +import java.util.*; +import sun.jvm.hotspot.debugger.*; +import sun.jvm.hotspot.runtime.*; +import sun.jvm.hotspot.types.*; + +public class CodeHeap extends VMObject { + private static Field memoryField; + private static Field segmapField; + // private static CIntegerField numberOfCommittedSegmentsField; + // private static CIntegerField numberOfReservedSegmentsField; + // private static CIntegerField segmentSizeField; + private static CIntegerField log2SegmentSizeField; + // private static CIntegerField nextSegmentField; + // private static AddressField freelistField; + // private static CIntegerField freeSegmentsField; + + private VirtualSpace memory; + private VirtualSpace segmentMap; + private int log2SegmentSize; + + static { + VM.registerVMInitializedObserver(new Observer() { + public void update(Observable o, Object data) { + initialize(VM.getVM().getTypeDataBase()); + } + }); + } + + private static void initialize(TypeDataBase db) { + Type type = db.lookupType("CodeHeap"); + + memoryField = type.getField("_memory"); + segmapField = type.getField("_segmap"); + log2SegmentSizeField = type.getCIntegerField("_log2_segment_size"); + + } + + public CodeHeap(Address addr) { + super(addr); + log2SegmentSize = (int) log2SegmentSizeField.getValue(addr); + segmentMap = new VirtualSpace(addr.addOffsetTo(segmapField.getOffset())); + memory = new VirtualSpace(addr.addOffsetTo(memoryField.getOffset())); + } + + public Address begin() { + return getMemory().low(); + } + + public Address end() { + return getMemory().high(); + } + + public boolean contains(Address p) { + return (begin().lessThanOrEqual(p) && end().greaterThan(p)); + } + + /** Returns the start of the block containing p or null */ + public Address findStart(Address p) { + if (!contains(p)) return null; + HeapBlock h = blockStart(p); + if (h == null || h.isFree()) { + return null; + } + return h.getAllocatedSpace(); + } + + public Address nextBlock(Address ptr) { + Address base = blockBase(ptr); + if (base == null) { + return null; + } + HeapBlock block = getBlockAt(base); + return base.addOffsetTo(block.getLength() * (1 << getLog2SegmentSize())); + } + + //-------------------------------------------------------------------------------- + // Internals only below this point + // + + private VirtualSpace getMemory() { + return memory; + } + + private VirtualSpace getSegmentMap() { + return segmentMap; + } + + private long segmentFor(Address p) { + return p.minus(getMemory().low()) >> getLog2SegmentSize(); + } + + private int getLog2SegmentSize() { + return log2SegmentSize; + } + + private HeapBlock getBlockAt(Address addr) { + return (HeapBlock) VMObjectFactory.newObject(HeapBlock.class, addr); + } + + + private HeapBlock blockStart(Address p) { + Address base = blockBase(p); + if (base == null) return null; + return getBlockAt(base); + } + + private Address blockBase(Address p) { + long i = segmentFor(p); + Address b = getSegmentMap().low(); + if (b.getCIntegerAt(i, 1, true) == 0xFF) { + return null; + } + while (b.getCIntegerAt(i, 1, true) > 0) { + i -= b.getCIntegerAt(i, 1, true); + } + return getMemory().low().addOffsetTo(i << getLog2SegmentSize()); + } + +}