Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/memory/SharedHeap.java @ 2177:3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank
author | coleenp |
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date | Thu, 27 Jan 2011 16:11:27 -0800 |
parents | c18cbe5936b8 |
children | da91efe96a93 |
rev | line source |
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0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2002, 2003, Oracle and/or its affiliates. All rights reserved. |
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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 package sun.jvm.hotspot.memory; | |
26 | |
27 import java.io.*; | |
28 import java.util.*; | |
29 | |
30 import sun.jvm.hotspot.debugger.*; | |
31 import sun.jvm.hotspot.gc_interface.*; | |
32 import sun.jvm.hotspot.runtime.*; | |
33 import sun.jvm.hotspot.types.*; | |
34 | |
35 public abstract class SharedHeap extends CollectedHeap { | |
36 private static AddressField permGenField; | |
37 private static VirtualConstructor ctor; | |
38 | |
39 static { | |
40 VM.registerVMInitializedObserver(new Observer() { | |
41 public void update(Observable o, Object data) { | |
42 initialize(VM.getVM().getTypeDataBase()); | |
43 } | |
44 }); | |
45 } | |
46 | |
47 private static synchronized void initialize(TypeDataBase db) { | |
48 Type type = db.lookupType("SharedHeap"); | |
49 permGenField = type.getAddressField("_perm_gen"); | |
50 ctor = new VirtualConstructor(db); | |
51 ctor.addMapping("CompactingPermGen", CompactingPermGen.class); | |
52 ctor.addMapping("CMSPermGen", CMSPermGen.class); | |
53 | |
54 } | |
55 | |
56 public SharedHeap(Address addr) { | |
57 super(addr); | |
58 } | |
59 | |
60 /** These functions return the "permanent" generation, in which | |
61 reflective objects are allocated and stored. Two versions, the | |
62 second of which returns the view of the perm gen as a | |
63 generation. (FIXME: this distinction is strange and seems | |
64 unnecessary, and should be cleaned up.) */ | |
65 public PermGen perm() { | |
66 return (PermGen) ctor.instantiateWrapperFor(permGenField.getValue(addr)); | |
67 } | |
68 | |
69 public CollectedHeapName kind() { | |
70 return CollectedHeapName.SHARED_HEAP; | |
71 } | |
72 | |
73 public Generation permGen() { | |
74 return perm().asGen(); | |
75 } | |
76 } |