/*
* Copyright (c) 2018, 2019, 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
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*/
package sun.jvm.hotspot.memory;
import java.util.*;
import sun.jvm.hotspot.debugger.Address;
import sun.jvm.hotspot.runtime.VM;
import sun.jvm.hotspot.runtime.VMObject;
import sun.jvm.hotspot.runtime.VMObjectFactory;
import sun.jvm.hotspot.types.*;
public class FileMapInfo {
private static FileMapHeader header;
private static Address headerValue;
// Fields for class FileMapHeader
private static Address mdSpaceValue;
private static Address mdRegionBaseAddress;
private static Address mdRegionEndAddress;
// HashMap created by mapping the vTable addresses in the md region with
// the corresponding metadata type.
private static Map<Address, Type> vTableTypeMap;
private static Type metadataTypeArray[];
static {
VM.registerVMInitializedObserver(new Observer() {
public void update(Observable o, Object data) {
initialize(VM.getVM().getTypeDataBase());
}
});
}
private static void initialize(TypeDataBase db) {
// FileMapInfo
Type type = db.lookupType("FileMapInfo");
AddressField currentInfoField = type.getAddressField("_current_info");
long headerFieldOffset = type.getField("_header").getOffset();
Address headerAddress = currentInfoField.getValue().addOffsetTo(headerFieldOffset);
headerValue = headerAddress.getAddressAt(0);
// FileMapHeader
type = db.lookupType("FileMapHeader");
AddressField spaceField = type.getAddressField("_space[0]");
Address spaceValue = headerValue.addOffsetTo(type.getField("_space[0]").getOffset());
mdSpaceValue = spaceValue.addOffsetTo(3 * spaceField.getSize());
// SpaceInfo
type = db.lookupType("CDSFileMapRegion");
long mdRegionBaseAddressOffset = type.getField("_mapped_base").getOffset();
mdRegionBaseAddress = (mdSpaceValue.addOffsetTo(mdRegionBaseAddressOffset)).getAddressAt(0);
long mdRegionSizeOffset = type.getField("_used").getOffset();
long mdRegionSize = (mdSpaceValue.addOffsetTo(mdRegionSizeOffset)).getAddressAt(0).asLongValue();
mdRegionEndAddress = mdRegionBaseAddress.addOffsetTo(mdRegionSize);
populateMetadataTypeArray(db);
}
private static void populateMetadataTypeArray(TypeDataBase db) {
metadataTypeArray = new Type[8];
metadataTypeArray[0] = db.lookupType("ConstantPool");
metadataTypeArray[1] = db.lookupType("InstanceKlass");
metadataTypeArray[2] = db.lookupType("InstanceClassLoaderKlass");
metadataTypeArray[3] = db.lookupType("InstanceMirrorKlass");
metadataTypeArray[4] = db.lookupType("InstanceRefKlass");
metadataTypeArray[5] = db.lookupType("Method");
metadataTypeArray[6] = db.lookupType("ObjArrayKlass");
metadataTypeArray[7] = db.lookupType("TypeArrayKlass");
}
public FileMapHeader getHeader() {
if (header == null) {
header = (FileMapHeader) VMObjectFactory.newObject(FileMapInfo.FileMapHeader.class, headerValue);
}
return header;
}
public boolean inCopiedVtableSpace(Address vptrAddress) {
FileMapHeader fmHeader = getHeader();
return fmHeader.inCopiedVtableSpace(vptrAddress);
}
public Type getTypeForVptrAddress(Address vptrAddress) {
if (vTableTypeMap == null) {
getHeader().createVtableTypeMapping();
}
return vTableTypeMap.get(vptrAddress);
}
//------------------------------------------------------------------------------------------
public static class FileMapHeader extends VMObject {
public FileMapHeader(Address addr) {
super(addr);
}
public boolean inCopiedVtableSpace(Address vptrAddress) {
if (vptrAddress.greaterThan(mdRegionBaseAddress) &&
vptrAddress.lessThanOrEqual(mdRegionEndAddress)) {
return true;
}
return false;
}
public void createVtableTypeMapping() {
vTableTypeMap = new HashMap<Address, Type>();
long metadataVTableSize = 0;
long addressSize = VM.getVM().getAddressSize();
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