Mercurial > hg > graal-compiler
comparison agent/src/share/classes/sun/jvm/hotspot/memory/Space.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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1 /* | |
2 * Copyright 2000-2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 package sun.jvm.hotspot.memory; | |
26 | |
27 import java.io.*; | |
28 import java.util.*; | |
29 import sun.jvm.hotspot.debugger.*; | |
30 import sun.jvm.hotspot.types.*; | |
31 import sun.jvm.hotspot.runtime.*; | |
32 | |
33 /** <P> A Space describes a heap area. Class Space is an abstract base | |
34 class. </P> | |
35 | |
36 <P> Space supports allocation, size computation and GC support is | |
37 provided. </P> | |
38 | |
39 <P> Invariant: bottom() and end() are on page_size boundaries and: </P> | |
40 | |
41 <P> bottom() <= top() <= end() </P> | |
42 | |
43 <P> top() is inclusive and end() is exclusive. </P> */ | |
44 | |
45 public abstract class Space extends VMObject { | |
46 private static AddressField bottomField; | |
47 private static AddressField endField; | |
48 | |
49 static { | |
50 VM.registerVMInitializedObserver(new Observer() { | |
51 public void update(Observable o, Object data) { | |
52 initialize(VM.getVM().getTypeDataBase()); | |
53 } | |
54 }); | |
55 } | |
56 | |
57 private static synchronized void initialize(TypeDataBase db) { | |
58 Type type = db.lookupType("Space"); | |
59 | |
60 bottomField = type.getAddressField("_bottom"); | |
61 endField = type.getAddressField("_end"); | |
62 } | |
63 | |
64 public Space(Address addr) { | |
65 super(addr); | |
66 } | |
67 | |
68 public Address bottom() { return bottomField.getValue(addr); } | |
69 public Address end() { return endField.getValue(addr); } | |
70 | |
71 /** Returns a subregion of the space containing all the objects in | |
72 the space. */ | |
73 public MemRegion usedRegion() { | |
74 return new MemRegion(bottom(), end()); | |
75 } | |
76 | |
77 /** Support for iteration over heap -- not sure how this will | |
78 interact with GC in reflective system, but necessary for the | |
79 debugging mechanism */ | |
80 public OopHandle bottomAsOopHandle() { | |
81 return bottomField.getOopHandle(addr); | |
82 } | |
83 | |
84 /** Support for iteration over heap -- not sure how this will | |
85 interact with GC in reflective system, but necessary for the | |
86 debugging mechanism */ | |
87 public OopHandle nextOopHandle(OopHandle handle, long size) { | |
88 return handle.addOffsetToAsOopHandle(size); | |
89 } | |
90 | |
91 /** returns all MemRegions where live objects are */ | |
92 public abstract List/*<MemRegion>*/ getLiveRegions(); | |
93 | |
94 /** Returned value is in bytes */ | |
95 public long capacity() { return end().minus(bottom()); } | |
96 /** Returned value is in bytes */ | |
97 public abstract long used(); | |
98 /** Returned value is in bytes */ | |
99 public abstract long free(); | |
100 | |
101 /** Testers */ | |
102 public boolean contains(Address p) { | |
103 return (bottom().lessThanOrEqual(p) && end().greaterThan(p)); | |
104 } | |
105 | |
106 public void print() { printOn(System.out); } | |
107 public void printOn(PrintStream tty) { | |
108 tty.print(" space capacity = "); | |
109 tty.print(capacity()); | |
110 tty.print(", "); | |
111 tty.print((double) used() * 100.0/ capacity()); | |
112 tty.print(" used"); | |
113 } | |
114 } |