Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/memory/SharedHeap.java @ 113:ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv
Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
author | coleenp |
---|---|
date | Sun, 13 Apr 2008 17:43:42 -0400 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 2002-2003 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.io.*; import java.util.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.gc_interface.*; import sun.jvm.hotspot.runtime.*; import sun.jvm.hotspot.types.*; public abstract class SharedHeap extends CollectedHeap { private static AddressField permGenField; private static VirtualConstructor ctor; static { VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } }); } private static synchronized void initialize(TypeDataBase db) { Type type = db.lookupType("SharedHeap"); permGenField = type.getAddressField("_perm_gen"); ctor = new VirtualConstructor(db); ctor.addMapping("CompactingPermGen", CompactingPermGen.class); ctor.addMapping("CMSPermGen", CMSPermGen.class); } public SharedHeap(Address addr) { super(addr); } /** These functions return the "permanent" generation, in which reflective objects are allocated and stored. Two versions, the second of which returns the view of the perm gen as a generation. (FIXME: this distinction is strange and seems unnecessary, and should be cleaned up.) */ public PermGen perm() { return (PermGen) ctor.instantiateWrapperFor(permGenField.getValue(addr)); } public CollectedHeapName kind() { return CollectedHeapName.SHARED_HEAP; } public Generation permGen() { return perm().asGen(); } }