Mercurial > hg > graal-jvmci-8
annotate agent/src/share/classes/sun/jvm/hotspot/oops/Oop.java @ 6169:cfa2c82f4c04
7175133: jinfo failed to get system properties after 6924259
Summary: String offset and count fields as fix of 6924259 were removed, and become optional. SA still use offset and count fields to read String contents and failed. Fix if they exist, use them other then use value field only to read, this keeps consistent with the changes in 6924259.
Reviewed-by: dholmes, mikael
Contributed-by: yumin.qi@oracle.com
| author | minqi |
|---|---|
| date | Fri, 22 Jun 2012 15:35:30 -0700 |
| parents | 63997f575155 |
| children | da91efe96a93 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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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.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); | |
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50 klass = new OopField(type.getOopField("_metadata._klass"), 0); |
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51 compressedKlass = new NarrowOopField(type.getOopField("_metadata._compressed_klass"), 0); |
| 0 | 52 headerSize = type.getSize(); |
| 53 } | |
| 54 | |
| 55 private OopHandle handle; | |
| 56 private ObjectHeap heap; | |
| 57 | |
| 58 Oop(OopHandle handle, ObjectHeap heap) { | |
| 59 this.handle = handle; | |
| 60 this.heap = heap; | |
| 61 } | |
| 62 | |
| 63 ObjectHeap getHeap() { return heap; } | |
| 64 | |
| 65 /** Should not be used or needed by most clients outside this | |
| 66 package; is needed, however, by {@link | |
| 67 sun.jvm.hotspot.utilities.MarkBits}. */ | |
| 68 public OopHandle getHandle() { return handle; } | |
| 69 | |
| 70 private static long headerSize; | |
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71 public static long getHeaderSize() { return headerSize; } // Header size in bytes. |
| 0 | 72 |
| 73 private static CIntField mark; | |
| 74 private static OopField klass; | |
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75 private static NarrowOopField compressedKlass; |
| 0 | 76 |
| 77 public boolean isShared() { | |
| 78 return CompactingPermGenGen.isShared(handle); | |
| 79 } | |
| 80 | |
| 81 public boolean isSharedReadOnly() { | |
| 82 return CompactingPermGenGen.isSharedReadOnly(handle); | |
| 83 } | |
| 84 | |
| 85 public boolean isSharedReadWrite() { | |
| 86 return CompactingPermGenGen.isSharedReadWrite(handle); | |
| 87 } | |
| 88 | |
| 89 // Accessors for declared fields | |
| 90 public Mark getMark() { return new Mark(getHandle()); } | |
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91 public Klass getKlass() { |
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92 if (VM.getVM().isCompressedOopsEnabled()) { |
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93 return (Klass) compressedKlass.getValue(this); |
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94 } else { |
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95 return (Klass) klass.getValue(this); |
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96 } |
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97 } |
| 0 | 98 |
| 99 public boolean isA(Klass k) { | |
| 100 return getKlass().isSubtypeOf(k); | |
| 101 } | |
| 102 | |
| 103 // Returns the byte size of this object | |
| 104 public long getObjectSize() { | |
| 105 Klass k = getKlass(); | |
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106 // All other types should be overriding getObjectSize directly |
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107 return ((InstanceKlass)k).getObjectSize(this); |
| 0 | 108 } |
| 109 | |
| 110 // Type test operations | |
| 111 public boolean isInstance() { return false; } | |
| 112 public boolean isInstanceRef() { return false; } | |
| 113 public boolean isArray() { return false; } | |
| 114 public boolean isObjArray() { return false; } | |
| 115 public boolean isTypeArray() { return false; } | |
| 116 public boolean isSymbol() { return false; } | |
| 117 public boolean isKlass() { return false; } | |
| 118 public boolean isThread() { return false; } | |
| 119 public boolean isMethod() { return false; } | |
| 120 public boolean isMethodData() { return false; } | |
| 121 public boolean isConstantPool() { return false; } | |
| 122 public boolean isConstantPoolCache() { return false; } | |
| 123 public boolean isCompiledICHolder() { return false; } | |
| 124 | |
| 125 // Align the object size. | |
| 126 public static long alignObjectSize(long size) { | |
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127 return VM.getVM().alignUp(size, VM.getVM().getMinObjAlignmentInBytes()); |
| 0 | 128 } |
| 129 | |
| 130 // All vm's align longs, so pad out certain offsets. | |
| 131 public static long alignObjectOffset(long offset) { | |
| 132 return VM.getVM().alignUp(offset, VM.getVM().getBytesPerLong()); | |
| 133 } | |
| 134 | |
| 135 public boolean equals(Object obj) { | |
| 136 if (obj != null && (obj instanceof Oop)) { | |
| 137 return getHandle().equals(((Oop) obj).getHandle()); | |
| 138 } | |
| 139 return false; | |
| 140 } | |
| 141 | |
| 142 public int hashCode() { return getHandle().hashCode(); } | |
| 143 | |
| 144 /** Identity hash in the target VM */ | |
| 145 public long identityHash() { | |
| 146 Mark mark = getMark(); | |
| 147 if (mark.isUnlocked() && (!mark.hasNoHash())) { | |
| 148 return (int) mark.hash(); | |
| 149 } else if (mark.isMarked()) { | |
| 150 return (int) mark.hash(); | |
| 151 } else { | |
| 152 return slowIdentityHash(); | |
| 153 } | |
| 154 } | |
| 155 | |
| 156 public long slowIdentityHash() { | |
| 157 return VM.getVM().getObjectSynchronizer().identityHashValueFor(this); | |
| 158 } | |
| 159 | |
| 160 public void iterate(OopVisitor visitor, boolean doVMFields) { | |
| 161 visitor.setObj(this); | |
| 162 visitor.prologue(); | |
| 163 iterateFields(visitor, doVMFields); | |
| 164 visitor.epilogue(); | |
| 165 } | |
| 166 | |
| 167 void iterateFields(OopVisitor visitor, boolean doVMFields) { | |
| 168 if (doVMFields) { | |
| 169 visitor.doCInt(mark, true); | |
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170 if (VM.getVM().isCompressedOopsEnabled()) { |
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171 visitor.doOop(compressedKlass, true); |
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172 } else { |
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173 visitor.doOop(klass, true); |
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174 } |
| 0 | 175 } |
| 176 } | |
| 177 | |
| 178 public void print() { printOn(System.out); } | |
| 179 public void printValue() { printValueOn(System.out); } | |
| 180 public void printRaw() { printRawOn(System.out); } | |
| 181 | |
| 182 public static void printOopValueOn(Oop obj, PrintStream tty) { | |
| 183 if (obj == null) { | |
| 184 tty.print("null"); | |
| 185 } else { | |
| 186 obj.printValueOn(tty); | |
| 187 tty.print(" @ " + obj.getHandle()); | |
| 188 } | |
| 189 } | |
| 190 | |
| 191 public static void printOopAddressOn(Oop obj, PrintStream tty) { | |
| 192 if (obj == null) { | |
| 193 tty.print("null"); | |
| 194 } else { | |
| 195 tty.print(obj.getHandle().toString()); | |
| 196 } | |
| 197 } | |
| 198 | |
| 199 public void printOn(PrintStream tty) { | |
| 200 OopPrinter printer = new OopPrinter(tty); | |
| 201 iterate(printer, true); | |
| 202 } | |
| 203 | |
| 204 public void printValueOn(PrintStream tty) { | |
| 205 try { | |
| 206 tty.print("Oop for " + getKlass().getName().asString()); | |
| 207 } catch (java.lang.NullPointerException e) { | |
| 208 tty.print("Oop"); | |
| 209 } | |
| 210 } | |
| 211 | |
| 212 public void printRawOn(PrintStream tty) { | |
| 213 tty.print("Dumping raw memory for "); | |
| 214 printValueOn(tty); | |
| 215 tty.println(); | |
| 216 long size = getObjectSize() * 4; | |
| 217 for (long i = 0; i < size; i += 4) { | |
| 218 long memVal = getHandle().getCIntegerAt(i, 4, true); | |
| 219 tty.println(Long.toHexString(memVal)); | |
| 220 } | |
| 221 } | |
| 222 | |
| 223 public boolean verify() { return true;} | |
| 224 | |
| 225 // Package-private routine to speed up ObjectHeap.newOop | |
| 226 static OopHandle getKlassForOopHandle(OopHandle handle) { | |
| 227 if (handle == null) { | |
| 228 return null; | |
| 229 } | |
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230 if (VM.getVM().isCompressedOopsEnabled()) { |
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231 return handle.getCompOopHandleAt(compressedKlass.getOffset()); |
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232 } else { |
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233 return handle.getOopHandleAt(klass.getOffset()); |
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234 } |
| 0 | 235 } |
| 236 }; |