Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/memory/CodeHeap.java @ 17398:9e1ec84d2899
fix privileged check for Stable
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Thu, 09 Oct 2014 11:32:21 -0700 |
parents | c18cbe5936b8 |
children |
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/* * Copyright (c) 2000, 2004, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.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()); } }