Mercurial > hg > graal-compiler
annotate agent/src/share/classes/sun/jvm/hotspot/code/StubQueue.java @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | a61af66fc99e |
| children |
| rev | line source |
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| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2000, 2002, 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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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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6941466: Oracle rebranding changes for Hotspot repositories
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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.code; | |
| 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 /** <P> A port of the VM's StubQueue. Note that the VM implicitly | |
| 34 knows the type of the objects contained in each StubQueue because | |
| 35 it passes in an instance of a StubInterface to the StubQueue's | |
| 36 constructor; the goal in the VM was to save space in the generated | |
| 37 code. In the SA APIs the pattern has been to use the | |
| 38 VirtualConstructor mechanism to instantiate wrapper objects of the | |
| 39 appropriate type for objects down in the VM; see, for example, the | |
| 40 CodeCache, which identifies NMethods, RuntimeStubs, etc. </P> | |
| 41 | |
| 42 <P> In this port we eliminate the StubInterface in favor of | |
| 43 passing in the class corresponding to the type of Stub which this | |
| 44 StubQueue contains. </P> */ | |
| 45 | |
| 46 public class StubQueue extends VMObject { | |
| 47 // FIXME: add the rest of the fields | |
| 48 private static AddressField stubBufferField; | |
| 49 private static CIntegerField bufferLimitField; | |
| 50 private static CIntegerField queueBeginField; | |
| 51 private static CIntegerField queueEndField; | |
| 52 private static CIntegerField numberOfStubsField; | |
| 53 | |
| 54 // The type of the contained stubs (i.e., InterpreterCodelet, | |
| 55 // ICStub). Must be a subclass of type Stub. | |
| 56 private Class stubType; | |
| 57 | |
| 58 static { | |
| 59 VM.registerVMInitializedObserver(new Observer() { | |
| 60 public void update(Observable o, Object data) { | |
| 61 initialize(VM.getVM().getTypeDataBase()); | |
| 62 } | |
| 63 }); | |
| 64 } | |
| 65 | |
| 66 private static synchronized void initialize(TypeDataBase db) { | |
| 67 Type type = db.lookupType("StubQueue"); | |
| 68 | |
| 69 stubBufferField = type.getAddressField("_stub_buffer"); | |
| 70 bufferLimitField = type.getCIntegerField("_buffer_limit"); | |
| 71 queueBeginField = type.getCIntegerField("_queue_begin"); | |
| 72 queueEndField = type.getCIntegerField("_queue_end"); | |
| 73 numberOfStubsField = type.getCIntegerField("_number_of_stubs"); | |
| 74 } | |
| 75 | |
| 76 public StubQueue(Address addr, Class stubType) { | |
| 77 super(addr); | |
| 78 this.stubType = stubType; | |
| 79 } | |
| 80 | |
| 81 public boolean contains(Address pc) { | |
| 82 if (pc == null) return false; | |
| 83 long offset = pc.minus(getStubBuffer()); | |
| 84 return ((0 <= offset) && (offset < getBufferLimit())); | |
| 85 } | |
| 86 | |
| 87 public Stub getStubContaining(Address pc) { | |
| 88 if (contains(pc)) { | |
| 89 int i = 0; | |
| 90 for (Stub s = getFirst(); s != null; s = getNext(s)) { | |
| 91 if (stubContains(s, pc)) { | |
| 92 return s; | |
| 93 } | |
| 94 } | |
| 95 } | |
| 96 return null; | |
| 97 } | |
| 98 | |
| 99 public boolean stubContains(Stub s, Address pc) { | |
| 100 return (s.codeBegin().lessThanOrEqual(pc) && s.codeEnd().greaterThan(pc)); | |
| 101 } | |
| 102 | |
| 103 public int getNumberOfStubs() { | |
| 104 return (int) numberOfStubsField.getValue(addr); | |
| 105 } | |
| 106 | |
| 107 public Stub getFirst() { | |
| 108 return ((getNumberOfStubs() > 0) ? getStubAt(getQueueBegin()) : null); | |
| 109 } | |
| 110 | |
| 111 public Stub getNext(Stub s) { | |
| 112 long i = getIndexOf(s) + getStubSize(s); | |
| 113 if (i == getBufferLimit()) { | |
| 114 i = 0; | |
| 115 } | |
| 116 return ((i == getQueueEnd()) ? null : getStubAt(i)); | |
| 117 } | |
| 118 | |
| 119 public Stub getPrev(Stub s) { | |
| 120 if (getIndexOf(s) == getQueueBegin()) { | |
| 121 return null; | |
| 122 } | |
| 123 | |
| 124 Stub temp = getFirst(); | |
| 125 Stub prev = null; | |
| 126 while (temp != null && getIndexOf(temp) != getIndexOf(s)) { | |
| 127 prev = temp; | |
| 128 temp = getNext(temp); | |
| 129 } | |
| 130 | |
| 131 return prev; | |
| 132 } | |
| 133 | |
| 134 //-------------------------------------------------------------------------------- | |
| 135 // Internals only below this point | |
| 136 // | |
| 137 | |
| 138 private long getQueueBegin() { | |
| 139 return queueBeginField.getValue(addr); | |
| 140 } | |
| 141 | |
| 142 private long getQueueEnd() { | |
| 143 return queueEndField.getValue(addr); | |
| 144 } | |
| 145 | |
| 146 private long getBufferLimit() { | |
| 147 return bufferLimitField.getValue(addr); | |
| 148 } | |
| 149 | |
| 150 private Address getStubBuffer() { | |
| 151 return stubBufferField.getValue(addr); | |
| 152 } | |
| 153 | |
| 154 private Stub getStubAt(long offset) { | |
| 155 checkIndex(offset); | |
| 156 return (Stub) VMObjectFactory.newObject(stubType, getStubBuffer().addOffsetTo(offset)); | |
| 157 } | |
| 158 | |
| 159 private long getIndexOf(Stub s) { | |
| 160 long i = s.getAddress().minus(getStubBuffer()); | |
| 161 checkIndex(i); | |
| 162 return i; | |
| 163 } | |
| 164 | |
| 165 private long getStubSize(Stub s) { | |
| 166 return s.getSize(); | |
| 167 } | |
| 168 | |
| 169 private void checkIndex(long i) { | |
| 170 if (Assert.ASSERTS_ENABLED) { | |
| 171 Assert.that(0 <= i && i < getBufferLimit() && (i % VM.getVM().getAddressSize() == 0), "illegal index"); | |
| 172 } | |
| 173 } | |
| 174 } |