Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/runtime/JNIHandleBlock.java @ 12226:7944aba7ba41
8015107: NPG: Use consistent naming for metaspace concepts
Reviewed-by: coleenp, mgerdin, hseigel
| author | ehelin |
|---|---|
| date | Mon, 12 Aug 2013 17:37:02 +0200 |
| parents | c18cbe5936b8 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
2 * Copyright (c) 2000, 2001, 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.runtime; | |
| 26 | |
| 27 import java.util.*; | |
| 28 import sun.jvm.hotspot.debugger.*; | |
| 29 import sun.jvm.hotspot.runtime.*; | |
| 30 import sun.jvm.hotspot.types.*; | |
| 31 import sun.jvm.hotspot.utilities.*; | |
| 32 | |
| 33 /** */ | |
| 34 public class JNIHandleBlock extends VMObject { | |
| 35 private static Field handlesField; | |
| 36 private static CIntegerField topField; | |
| 37 private static AddressField nextField; | |
| 38 | |
| 39 private static int blockSizeInOops; | |
| 40 | |
| 41 static { | |
| 42 VM.registerVMInitializedObserver(new Observer() { | |
| 43 public void update(Observable o, Object data) { | |
| 44 initialize(VM.getVM().getTypeDataBase()); | |
| 45 } | |
| 46 }); | |
| 47 } | |
| 48 | |
| 49 private static synchronized void initialize(TypeDataBase db) { | |
| 50 Type type = db.lookupType("JNIHandleBlock"); | |
| 51 | |
| 52 handlesField = type.getField("_handles"); | |
| 53 topField = type.getCIntegerField("_top"); | |
| 54 nextField = type.getAddressField("_next"); | |
| 55 | |
| 56 blockSizeInOops = db.lookupIntConstant("JNIHandleBlock::block_size_in_oops").intValue(); | |
| 57 } | |
| 58 | |
| 59 public JNIHandleBlock(Address addr) { | |
| 60 super(addr); | |
| 61 } | |
| 62 | |
| 63 public JNIHandleBlock next() { | |
| 64 Address handleAddr = nextField.getValue(addr); | |
| 65 if (handleAddr == null) { | |
| 66 return null; | |
| 67 } | |
| 68 | |
| 69 /* the next handle block is valid only if the current block is full */ | |
| 70 if (top() < blockSizeInOops) { | |
| 71 return null; | |
| 72 } | |
| 73 return new JNIHandleBlock(handleAddr); | |
| 74 } | |
| 75 | |
| 76 public int top() { | |
| 77 return (int) topField.getValue(addr); | |
| 78 } | |
| 79 | |
| 80 public void oopsDo(AddressVisitor visitor) { | |
| 81 // Visit handles in this block | |
| 82 for (int i = 0; i < top(); i++) { | |
| 83 Address cur = getOopHandleAddress(i); | |
| 84 if (cur != null) { | |
| 85 visitor.visitAddress(cur); | |
| 86 } | |
| 87 } | |
| 88 | |
| 89 // Visit handles in subsequent blocks if necessary | |
| 90 JNIHandleBlock n = next(); | |
| 91 if (n != null) { | |
| 92 n.oopsDo(visitor); | |
| 93 } | |
| 94 } | |
| 95 | |
| 96 public OopHandle getOopHandle(int x) { | |
| 97 Address oopAddr = getOopHandleAddress(x); | |
| 98 if (oopAddr != null) { | |
| 99 return oopAddr.getOopHandleAt(0); | |
| 100 } | |
| 101 return null; | |
| 102 } | |
| 103 | |
| 104 /** Debugging routine only. Returns non-null JNIHandleBlock | |
| 105 containing the JNI handle or null if this handle block and its | |
| 106 successors did not contain it (or if the handle was deleted). */ | |
| 107 public JNIHandleBlock blockContainingHandle(Address jniHandle) { | |
| 108 JNIHandleBlock cur = this; | |
| 109 while (cur != null) { | |
| 110 if (indexOfHandle(jniHandle) >= 0) { | |
| 111 return cur; | |
| 112 } | |
| 113 cur = cur.next(); | |
| 114 } | |
| 115 return null; | |
| 116 } | |
| 117 | |
| 118 /** Debugging routine: returns the index (0..top() - 1) of the | |
| 119 handle in this block, or -1 if the handle was not contained in | |
| 120 this block. Does not search successor blocks. */ | |
| 121 public int indexOfHandle(Address jniHandle) { | |
| 122 for (int i = 0; i < top(); i++) { | |
| 123 Address addr = getOopHandleAddress(i); | |
| 124 if (addr != null) { | |
| 125 if (addr.equals(jniHandle)) { | |
| 126 return i; | |
| 127 } | |
| 128 } | |
| 129 } | |
| 130 return -1; | |
| 131 } | |
| 132 | |
| 133 public String toString() { | |
| 134 Address handleBase = addr.addOffsetTo(handlesField.getOffset()); | |
| 135 Address handleEnd = addr.addOffsetTo(handlesField.getOffset() + top() * VM.getVM().getOopSize()); | |
| 136 return "JNIHandleBlock [" + handleBase + ", " + handleEnd + ")"; | |
| 137 } | |
| 138 | |
| 139 /** Only returns addresses of valid OopHandles */ | |
| 140 private Address getOopHandleAddress(int x) { | |
| 141 if (Assert.ASSERTS_ENABLED) { | |
| 142 Assert.that(x < top(), "out of bounds"); | |
| 143 } | |
| 144 | |
| 145 Address oopAddr = addr.addOffsetTo(handlesField.getOffset() + x * VM.getVM().getOopSize()); | |
| 146 OopHandle handle = oopAddr.getOopHandleAt(0); | |
| 147 if (VM.getVM().getUniverse().isInReserved(handle) && !VM.getVM().getJNIHandles().isDeletedHandle(handle)) { | |
| 148 /* the oop handle is valid only if it is not freed (i.e. reserved in heap) and is not a deleted oop */ | |
| 149 return oopAddr; | |
| 150 } else { | |
| 151 return null; | |
| 152 } | |
| 153 } | |
| 154 } |