Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/code/ScopeDesc.java @ 900:9987d9d5eb0e
6833129: specjvm98 fails with NullPointerException in the compiler with -XX:DeoptimizeALot
Summary: developed a reexecute logic for the interpreter to reexecute the bytecode when deopt happens
Reviewed-by: kvn, never, jrose, twisti
| author | cfang |
|---|---|
| date | Fri, 31 Jul 2009 17:12:33 -0700 |
| parents | b109e761e927 |
| children | 15bbd3f505c0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 2000-2005 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.code; | |
| 26 | |
| 27 import java.io.*; | |
| 28 import java.util.*; | |
| 29 | |
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30 import sun.jvm.hotspot.debugger.*; |
| 0 | 31 import sun.jvm.hotspot.oops.*; |
| 32 import sun.jvm.hotspot.runtime.*; | |
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33 import sun.jvm.hotspot.utilities.*; |
| 0 | 34 |
| 35 /** ScopeDescs contain the information that makes source-level | |
| 36 debugging of nmethods possible; each scopeDesc describes a method | |
| 37 activation */ | |
| 38 | |
| 39 public class ScopeDesc { | |
| 40 /** NMethod information */ | |
| 41 private NMethod code; | |
| 42 private Method method; | |
| 43 private int bci; | |
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44 private boolean reexecute; |
| 0 | 45 /** Decoding offsets */ |
| 46 private int decodeOffset; | |
| 47 private int senderDecodeOffset; | |
| 48 private int localsDecodeOffset; | |
| 49 private int expressionsDecodeOffset; | |
| 50 private int monitorsDecodeOffset; | |
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51 /** Scalar replaced bjects pool */ |
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52 private List objects; // ArrayList<ScopeValue> |
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53 |
| 0 | 54 |
| 55 public ScopeDesc(NMethod code, int decodeOffset) { | |
| 56 this.code = code; | |
| 57 this.decodeOffset = decodeOffset; | |
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58 this.objects = decodeObjectValues(DebugInformationRecorder.SERIALIZED_NULL); |
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59 |
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60 // Decode header |
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61 DebugInfoReadStream stream = streamAt(decodeOffset); |
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62 |
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63 senderDecodeOffset = stream.readInt(); |
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64 method = (Method) VM.getVM().getObjectHeap().newOop(stream.readOopHandle()); |
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65 setBCIAndReexecute(stream.readInt()); |
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66 // Decode offsets for body and sender |
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67 localsDecodeOffset = stream.readInt(); |
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68 expressionsDecodeOffset = stream.readInt(); |
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69 monitorsDecodeOffset = stream.readInt(); |
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70 } |
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71 |
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72 public ScopeDesc(NMethod code, int decodeOffset, int objectDecodeOffset) { |
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73 this.code = code; |
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74 this.decodeOffset = decodeOffset; |
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75 this.objects = decodeObjectValues(objectDecodeOffset); |
| 0 | 76 |
| 77 // Decode header | |
| 78 DebugInfoReadStream stream = streamAt(decodeOffset); | |
| 79 | |
| 80 senderDecodeOffset = stream.readInt(); | |
| 81 method = (Method) VM.getVM().getObjectHeap().newOop(stream.readOopHandle()); | |
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82 setBCIAndReexecute(stream.readInt()); |
| 0 | 83 // Decode offsets for body and sender |
| 84 localsDecodeOffset = stream.readInt(); | |
| 85 expressionsDecodeOffset = stream.readInt(); | |
| 86 monitorsDecodeOffset = stream.readInt(); | |
| 87 } | |
| 88 | |
| 89 public NMethod getNMethod() { return code; } | |
| 90 public Method getMethod() { return method; } | |
| 91 public int getBCI() { return bci; } | |
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92 public boolean getReexecute() {return reexecute;} |
| 0 | 93 |
| 94 /** Returns a List<ScopeValue> */ | |
| 95 public List getLocals() { | |
| 96 return decodeScopeValues(localsDecodeOffset); | |
| 97 } | |
| 98 | |
| 99 /** Returns a List<ScopeValue> */ | |
| 100 public List getExpressions() { | |
| 101 return decodeScopeValues(expressionsDecodeOffset); | |
| 102 } | |
| 103 | |
| 104 /** Returns a List<MonitorValue> */ | |
| 105 public List getMonitors() { | |
| 106 return decodeMonitorValues(monitorsDecodeOffset); | |
| 107 } | |
| 108 | |
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109 /** Returns a List<MonitorValue> */ |
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110 public List getObjects() { |
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111 return objects; |
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112 } |
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113 |
| 0 | 114 /** Stack walking. Returns null if this is the outermost scope. */ |
| 115 public ScopeDesc sender() { | |
| 116 if (isTop()) { | |
| 117 return null; | |
| 118 } | |
| 119 | |
| 120 return new ScopeDesc(code, senderDecodeOffset); | |
| 121 } | |
| 122 | |
| 123 /** Returns where the scope was decoded */ | |
| 124 public int getDecodeOffset() { | |
| 125 return decodeOffset; | |
| 126 } | |
| 127 | |
| 128 /** Tells whether sender() returns null */ | |
| 129 public boolean isTop() { | |
| 130 return (senderDecodeOffset == DebugInformationRecorder.SERIALIZED_NULL); | |
| 131 } | |
| 132 | |
| 133 public boolean equals(Object arg) { | |
| 134 if (arg == null) { | |
| 135 return false; | |
| 136 } | |
| 137 | |
| 138 if (!(arg instanceof ScopeDesc)) { | |
| 139 return false; | |
| 140 } | |
| 141 | |
| 142 ScopeDesc sd = (ScopeDesc) arg; | |
| 143 | |
| 144 return (sd.method.equals(method) && (sd.bci == bci)); | |
| 145 } | |
| 146 | |
| 147 public void printValue() { | |
| 148 printValueOn(System.out); | |
| 149 } | |
| 150 | |
| 151 public void printValueOn(PrintStream tty) { | |
| 152 tty.print("ScopeDesc for "); | |
| 153 method.printValueOn(tty); | |
| 154 tty.println(" @bci " + bci); | |
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155 tty.println(" reexecute: " + reexecute); |
| 0 | 156 } |
| 157 | |
| 158 // FIXME: add more accessors | |
| 159 | |
| 160 //-------------------------------------------------------------------------------- | |
| 161 // Internals only below this point | |
| 162 // | |
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163 private void setBCIAndReexecute(int combination) { |
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164 int InvocationEntryBci = VM.getVM().getInvocationEntryBCI(); |
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165 bci = (combination >> 1) + InvocationEntryBci; |
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166 reexecute = (combination & 1)==1 ? true : false; |
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167 } |
| 0 | 168 |
| 169 private DebugInfoReadStream streamAt(int decodeOffset) { | |
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170 return new DebugInfoReadStream(code, decodeOffset, objects); |
| 0 | 171 } |
| 172 | |
| 173 /** Returns a List<ScopeValue> or null if no values were present */ | |
| 174 private List decodeScopeValues(int decodeOffset) { | |
| 175 if (decodeOffset == DebugInformationRecorder.SERIALIZED_NULL) { | |
| 176 return null; | |
| 177 } | |
| 178 DebugInfoReadStream stream = streamAt(decodeOffset); | |
| 179 int length = stream.readInt(); | |
| 180 List res = new ArrayList(length); | |
| 181 for (int i = 0; i < length; i++) { | |
| 182 res.add(ScopeValue.readFrom(stream)); | |
| 183 } | |
| 184 return res; | |
| 185 } | |
| 186 | |
| 187 /** Returns a List<MonitorValue> or null if no values were present */ | |
| 188 private List decodeMonitorValues(int decodeOffset) { | |
| 189 if (decodeOffset == DebugInformationRecorder.SERIALIZED_NULL) { | |
| 190 return null; | |
| 191 } | |
| 192 DebugInfoReadStream stream = streamAt(decodeOffset); | |
| 193 int length = stream.readInt(); | |
| 194 List res = new ArrayList(length); | |
| 195 for (int i = 0; i < length; i++) { | |
| 196 res.add(new MonitorValue(stream)); | |
| 197 } | |
| 198 return res; | |
| 199 } | |
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200 |
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201 /** Returns a List<ObjectValue> or null if no values were present */ |
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202 private List decodeObjectValues(int decodeOffset) { |
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203 if (decodeOffset == DebugInformationRecorder.SERIALIZED_NULL) { |
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204 return null; |
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205 } |
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206 List res = new ArrayList(); |
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207 DebugInfoReadStream stream = new DebugInfoReadStream(code, decodeOffset, res); |
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208 int length = stream.readInt(); |
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209 for (int i = 0; i < length; i++) { |
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210 // Objects values are pushed to 'res' array during read so that |
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211 // object's fields could reference it (OBJECT_ID_CODE). |
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212 ScopeValue.readFrom(stream); |
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213 // res.add(ScopeValue.readFrom(stream)); |
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214 } |
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215 Assert.that(res.size() == length, "inconsistent debug information"); |
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216 return res; |
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217 } |
| 0 | 218 } |