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comparison agent/src/share/classes/sun/jvm/hotspot/code/ScopeDesc.java @ 900:9987d9d5eb0e

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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
comparison
equal deleted inserted replaced
899:55cb84cd1247 900:9987d9d5eb0e
39 public class ScopeDesc { 39 public class ScopeDesc {
40 /** NMethod information */ 40 /** NMethod information */
41 private NMethod code; 41 private NMethod code;
42 private Method method; 42 private Method method;
43 private int bci; 43 private int bci;
44 private boolean reexecute;
44 /** Decoding offsets */ 45 /** Decoding offsets */
45 private int decodeOffset; 46 private int decodeOffset;
46 private int senderDecodeOffset; 47 private int senderDecodeOffset;
47 private int localsDecodeOffset; 48 private int localsDecodeOffset;
48 private int expressionsDecodeOffset; 49 private int expressionsDecodeOffset;
59 // Decode header 60 // Decode header
60 DebugInfoReadStream stream = streamAt(decodeOffset); 61 DebugInfoReadStream stream = streamAt(decodeOffset);
61 62
62 senderDecodeOffset = stream.readInt(); 63 senderDecodeOffset = stream.readInt();
63 method = (Method) VM.getVM().getObjectHeap().newOop(stream.readOopHandle()); 64 method = (Method) VM.getVM().getObjectHeap().newOop(stream.readOopHandle());
64 bci = stream.readBCI(); 65 setBCIAndReexecute(stream.readInt());
65 // Decode offsets for body and sender 66 // Decode offsets for body and sender
66 localsDecodeOffset = stream.readInt(); 67 localsDecodeOffset = stream.readInt();
67 expressionsDecodeOffset = stream.readInt(); 68 expressionsDecodeOffset = stream.readInt();
68 monitorsDecodeOffset = stream.readInt(); 69 monitorsDecodeOffset = stream.readInt();
69 } 70 }
76 // Decode header 77 // Decode header
77 DebugInfoReadStream stream = streamAt(decodeOffset); 78 DebugInfoReadStream stream = streamAt(decodeOffset);
78 79
79 senderDecodeOffset = stream.readInt(); 80 senderDecodeOffset = stream.readInt();
80 method = (Method) VM.getVM().getObjectHeap().newOop(stream.readOopHandle()); 81 method = (Method) VM.getVM().getObjectHeap().newOop(stream.readOopHandle());
81 bci = stream.readBCI(); 82 setBCIAndReexecute(stream.readInt());
82 // Decode offsets for body and sender 83 // Decode offsets for body and sender
83 localsDecodeOffset = stream.readInt(); 84 localsDecodeOffset = stream.readInt();
84 expressionsDecodeOffset = stream.readInt(); 85 expressionsDecodeOffset = stream.readInt();
85 monitorsDecodeOffset = stream.readInt(); 86 monitorsDecodeOffset = stream.readInt();
86 } 87 }
87 88
88 public NMethod getNMethod() { return code; } 89 public NMethod getNMethod() { return code; }
89 public Method getMethod() { return method; } 90 public Method getMethod() { return method; }
90 public int getBCI() { return bci; } 91 public int getBCI() { return bci; }
92 public boolean getReexecute() {return reexecute;}
91 93
92 /** Returns a List<ScopeValue> */ 94 /** Returns a List<ScopeValue> */
93 public List getLocals() { 95 public List getLocals() {
94 return decodeScopeValues(localsDecodeOffset); 96 return decodeScopeValues(localsDecodeOffset);
95 } 97 }
148 150
149 public void printValueOn(PrintStream tty) { 151 public void printValueOn(PrintStream tty) {
150 tty.print("ScopeDesc for "); 152 tty.print("ScopeDesc for ");
151 method.printValueOn(tty); 153 method.printValueOn(tty);
152 tty.println(" @bci " + bci); 154 tty.println(" @bci " + bci);
155 tty.println(" reexecute: " + reexecute);
153 } 156 }
154 157
155 // FIXME: add more accessors 158 // FIXME: add more accessors
156 159
157 //-------------------------------------------------------------------------------- 160 //--------------------------------------------------------------------------------
158 // Internals only below this point 161 // Internals only below this point
159 // 162 //
163 private void setBCIAndReexecute(int combination) {
164 int InvocationEntryBci = VM.getVM().getInvocationEntryBCI();
165 bci = (combination >> 1) + InvocationEntryBci;
166 reexecute = (combination & 1)==1 ? true : false;
167 }
160 168
161 private DebugInfoReadStream streamAt(int decodeOffset) { 169 private DebugInfoReadStream streamAt(int decodeOffset) {
162 return new DebugInfoReadStream(code, decodeOffset, objects); 170 return new DebugInfoReadStream(code, decodeOffset, objects);
163 } 171 }
164 172