1 /* 2 * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.gc.z; 26 27 import java.io.PrintStream; 28 29 import sun.jvm.hotspot.debugger.Address; 30 import sun.jvm.hotspot.runtime.VM; 31 import sun.jvm.hotspot.runtime.VMObject; 32 import sun.jvm.hotspot.runtime.VMObjectFactory; 33 import sun.jvm.hotspot.types.Type; 34 import sun.jvm.hotspot.types.TypeDataBase; 35 36 // Mirror class for ZHeap 37 38 public class ZHeap extends VMObject { 39 40 private static long pageAllocatorFieldOffset; 41 private static long pageTableFieldOffset; 42 43 static { 44 VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase())); 45 } 46 47 private static synchronized void initialize(TypeDataBase db) { 48 Type type = db.lookupType("ZHeap"); 49 50 pageAllocatorFieldOffset = type.getAddressField("_page_allocator").getOffset(); 51 pageTableFieldOffset = type.getAddressField("_pagetable").getOffset(); 52 } 53 54 public ZHeap(Address addr) { 55 super(addr); 56 } 57 58 private ZPageAllocator pageAllocator() { 59 Address pageAllocatorAddr = addr.addOffsetTo(pageAllocatorFieldOffset); 60 return (ZPageAllocator)VMObjectFactory.newObject(ZPageAllocator.class, pageAllocatorAddr); 61 } 62 63 ZPageTable pageTable() { 64 return (ZPageTable)VMObjectFactory.newObject(ZPageTable.class, addr.addOffsetTo(pageTableFieldOffset)); 65 } 66 67 public long maxCapacity() { 68 return pageAllocator().maxCapacity(); 69 } 70 71 public long capacity() { 72 return pageAllocator().capacity(); 73 } 74 75 public long used() { 76 return pageAllocator().used(); 77 } 78 79 boolean is_relocating(Address o) { 80 return pageTable().is_relocating(o); 81 } 82 83 Address forward_object(Address addr) { 84 ZPage page = pageTable().get(addr); 85 return page.forward_object(addr); 86 } 87 88 Address relocate_object(Address addr) { 89 ZPage page = pageTable().get(addr); 90 return page.relocate_object(addr); 91 } 92 93 public void printOn(PrintStream tty) { 94 tty.print(" ZHeap "); 95 tty.print("used " + (used() / 1024 / 1024) + "M, "); 96 tty.print("capacity " + (capacity() / 1024 / 1024) + "M, "); 97 tty.println("max capacity " + (maxCapacity() / 1024 / 1024) + "M"); 98 } 99 }