Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/memory/CompactibleSpace.java @ 7402:fd74228fd5ca
8004076: Move _max_locals and _size_of_parameters to ConstMethod for better sharing.
Summary: Move _max_locals and _size_of_parameters to ConstMethod for better sharing.
Reviewed-by: coleenp, minqi, jrose
author | jiangli |
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date | Tue, 11 Dec 2012 12:41:31 -0500 |
parents | c18cbe5936b8 |
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rev | line source |
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0 | 1 /* |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 package sun.jvm.hotspot.memory; | |
26 | |
27 import java.util.*; | |
28 | |
29 import sun.jvm.hotspot.debugger.*; | |
30 import sun.jvm.hotspot.runtime.*; | |
31 import sun.jvm.hotspot.types.*; | |
32 | |
33 /** A space that supports compaction operations. This is usually, but | |
34 not necessarily, a space that is normally contiguous. But, for | |
35 example, a free-list-based space whose normal collection is a | |
36 mark-sweep without compaction could still support compaction in | |
37 full GC's. */ | |
38 | |
39 public abstract class CompactibleSpace extends Space { | |
40 private static AddressField compactionTopField; | |
41 | |
42 static { | |
43 VM.registerVMInitializedObserver(new Observer() { | |
44 public void update(Observable o, Object data) { | |
45 initialize(VM.getVM().getTypeDataBase()); | |
46 } | |
47 }); | |
48 } | |
49 | |
50 private static synchronized void initialize(TypeDataBase db) { | |
51 Type type = db.lookupType("CompactibleSpace"); | |
52 | |
53 compactionTopField = type.getAddressField("_compaction_top"); | |
54 } | |
55 | |
56 public CompactibleSpace(Address addr) { | |
57 super(addr); | |
58 } | |
59 | |
60 /** May be used temporarily during a compaction phase. */ | |
61 public Address compactionTop() { | |
62 return compactionTopField.getValue(addr); | |
63 } | |
64 } |