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comparison agent/src/share/classes/sun/jvm/hotspot/oops/Oop.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | ba764ed4b6f2 |
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1 /* | |
2 * Copyright 2000-2007 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.oops; | |
26 | |
27 import java.io.*; | |
28 import java.util.*; | |
29 import sun.jvm.hotspot.utilities.*; | |
30 import sun.jvm.hotspot.debugger.*; | |
31 import sun.jvm.hotspot.runtime.*; | |
32 import sun.jvm.hotspot.types.*; | |
33 import sun.jvm.hotspot.memory.CompactingPermGenGen; | |
34 | |
35 // Oop represents the superclass for all types of | |
36 // objects in the HotSpot object heap. | |
37 | |
38 public class Oop { | |
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) throws WrongTypeException { | |
48 Type type = db.lookupType("oopDesc"); | |
49 mark = new CIntField(type.getCIntegerField("_mark"), 0); | |
50 klass = new OopField(type.getOopField("_klass"), 0); | |
51 headerSize = type.getSize(); | |
52 } | |
53 | |
54 private OopHandle handle; | |
55 private ObjectHeap heap; | |
56 | |
57 Oop(OopHandle handle, ObjectHeap heap) { | |
58 this.handle = handle; | |
59 this.heap = heap; | |
60 } | |
61 | |
62 ObjectHeap getHeap() { return heap; } | |
63 | |
64 /** Should not be used or needed by most clients outside this | |
65 package; is needed, however, by {@link | |
66 sun.jvm.hotspot.utilities.MarkBits}. */ | |
67 public OopHandle getHandle() { return handle; } | |
68 | |
69 private static long headerSize; | |
70 public static long getHeaderSize() { return headerSize; } | |
71 | |
72 private static CIntField mark; | |
73 private static OopField klass; | |
74 | |
75 public boolean isShared() { | |
76 return CompactingPermGenGen.isShared(handle); | |
77 } | |
78 | |
79 public boolean isSharedReadOnly() { | |
80 return CompactingPermGenGen.isSharedReadOnly(handle); | |
81 } | |
82 | |
83 public boolean isSharedReadWrite() { | |
84 return CompactingPermGenGen.isSharedReadWrite(handle); | |
85 } | |
86 | |
87 // Accessors for declared fields | |
88 public Mark getMark() { return new Mark(getHandle()); } | |
89 public Klass getKlass() { return (Klass) klass.getValue(this); } | |
90 | |
91 public boolean isA(Klass k) { | |
92 return getKlass().isSubtypeOf(k); | |
93 } | |
94 | |
95 // Returns the byte size of this object | |
96 public long getObjectSize() { | |
97 Klass k = getKlass(); | |
98 if (k instanceof InstanceKlass) { | |
99 return ((InstanceKlass)k).getSizeHelper() | |
100 * VM.getVM().getAddressSize(); | |
101 } | |
102 // If it is not an instance, this method should be replaced. | |
103 return getHeaderSize(); | |
104 } | |
105 | |
106 // Type test operations | |
107 public boolean isInstance() { return false; } | |
108 public boolean isInstanceRef() { return false; } | |
109 public boolean isArray() { return false; } | |
110 public boolean isObjArray() { return false; } | |
111 public boolean isTypeArray() { return false; } | |
112 public boolean isSymbol() { return false; } | |
113 public boolean isKlass() { return false; } | |
114 public boolean isThread() { return false; } | |
115 public boolean isMethod() { return false; } | |
116 public boolean isMethodData() { return false; } | |
117 public boolean isConstantPool() { return false; } | |
118 public boolean isConstantPoolCache() { return false; } | |
119 public boolean isCompiledICHolder() { return false; } | |
120 | |
121 // Align the object size. | |
122 public static long alignObjectSize(long size) { | |
123 return VM.getVM().alignUp(size, VM.getVM().getMinObjAlignmentInBytes()); | |
124 } | |
125 | |
126 // All vm's align longs, so pad out certain offsets. | |
127 public static long alignObjectOffset(long offset) { | |
128 return VM.getVM().alignUp(offset, VM.getVM().getBytesPerLong()); | |
129 } | |
130 | |
131 public boolean equals(Object obj) { | |
132 if (obj != null && (obj instanceof Oop)) { | |
133 return getHandle().equals(((Oop) obj).getHandle()); | |
134 } | |
135 return false; | |
136 } | |
137 | |
138 public int hashCode() { return getHandle().hashCode(); } | |
139 | |
140 /** Identity hash in the target VM */ | |
141 public long identityHash() { | |
142 Mark mark = getMark(); | |
143 if (mark.isUnlocked() && (!mark.hasNoHash())) { | |
144 return (int) mark.hash(); | |
145 } else if (mark.isMarked()) { | |
146 return (int) mark.hash(); | |
147 } else { | |
148 return slowIdentityHash(); | |
149 } | |
150 } | |
151 | |
152 public long slowIdentityHash() { | |
153 return VM.getVM().getObjectSynchronizer().identityHashValueFor(this); | |
154 } | |
155 | |
156 public void iterate(OopVisitor visitor, boolean doVMFields) { | |
157 visitor.setObj(this); | |
158 visitor.prologue(); | |
159 iterateFields(visitor, doVMFields); | |
160 visitor.epilogue(); | |
161 } | |
162 | |
163 void iterateFields(OopVisitor visitor, boolean doVMFields) { | |
164 if (doVMFields) { | |
165 visitor.doCInt(mark, true); | |
166 visitor.doOop(klass, true); | |
167 } | |
168 } | |
169 | |
170 public void print() { printOn(System.out); } | |
171 public void printValue() { printValueOn(System.out); } | |
172 public void printRaw() { printRawOn(System.out); } | |
173 | |
174 public static void printOopValueOn(Oop obj, PrintStream tty) { | |
175 if (obj == null) { | |
176 tty.print("null"); | |
177 } else { | |
178 obj.printValueOn(tty); | |
179 tty.print(" @ " + obj.getHandle()); | |
180 } | |
181 } | |
182 | |
183 public static void printOopAddressOn(Oop obj, PrintStream tty) { | |
184 if (obj == null) { | |
185 tty.print("null"); | |
186 } else { | |
187 tty.print(obj.getHandle().toString()); | |
188 } | |
189 } | |
190 | |
191 public void printOn(PrintStream tty) { | |
192 OopPrinter printer = new OopPrinter(tty); | |
193 iterate(printer, true); | |
194 } | |
195 | |
196 public void printValueOn(PrintStream tty) { | |
197 try { | |
198 tty.print("Oop for " + getKlass().getName().asString()); | |
199 } catch (java.lang.NullPointerException e) { | |
200 tty.print("Oop"); | |
201 } | |
202 } | |
203 | |
204 public void printRawOn(PrintStream tty) { | |
205 tty.print("Dumping raw memory for "); | |
206 printValueOn(tty); | |
207 tty.println(); | |
208 long size = getObjectSize() * 4; | |
209 for (long i = 0; i < size; i += 4) { | |
210 long memVal = getHandle().getCIntegerAt(i, 4, true); | |
211 tty.println(Long.toHexString(memVal)); | |
212 } | |
213 } | |
214 | |
215 public boolean verify() { return true;} | |
216 | |
217 // Package-private routine to speed up ObjectHeap.newOop | |
218 static OopHandle getKlassForOopHandle(OopHandle handle) { | |
219 if (handle == null) { | |
220 return null; | |
221 } | |
222 return handle.getOopHandleAt(klass.getOffset()); | |
223 } | |
224 }; |