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comparison src/share/vm/code/debugInfo.hpp @ 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 a61af66fc99e
children 72088be4b386
comparison
equal deleted inserted replaced
899:55cb84cd1247 900:9987d9d5eb0e
253 return code()->oop_at(read_int()); 253 return code()->oop_at(read_int());
254 } 254 }
255 ScopeValue* read_object_value(); 255 ScopeValue* read_object_value();
256 ScopeValue* get_cached_object(); 256 ScopeValue* get_cached_object();
257 // BCI encoding is mostly unsigned, but -1 is a distinguished value 257 // BCI encoding is mostly unsigned, but -1 is a distinguished value
258 int read_bci() { return read_int() + InvocationEntryBci; } 258 // Decoding based on encoding: bci = InvocationEntryBci + read_int()/2; reexecute = read_int()%2 == 1 ? true : false;
259 int read_bci_and_reexecute(bool& reexecute) { int i = read_int(); reexecute = (i & 1) ? true : false; return (i >> 1) + InvocationEntryBci; }
259 }; 260 };
260 261
261 // DebugInfoWriteStream specializes CompressedWriteStream for 262 // DebugInfoWriteStream specializes CompressedWriteStream for
262 // writing debugging information. Used by ScopeDescRecorder. 263 // writing debugging information. Used by ScopeDescRecorder.
263 264
266 DebugInformationRecorder* _recorder; 267 DebugInformationRecorder* _recorder;
267 DebugInformationRecorder* recorder() const { return _recorder; } 268 DebugInformationRecorder* recorder() const { return _recorder; }
268 public: 269 public:
269 DebugInfoWriteStream(DebugInformationRecorder* recorder, int initial_size); 270 DebugInfoWriteStream(DebugInformationRecorder* recorder, int initial_size);
270 void write_handle(jobject h); 271 void write_handle(jobject h);
271 void write_bci(int bci) { write_int(bci - InvocationEntryBci); } 272 //Encoding bci and reexecute into one word as (bci - InvocationEntryBci)*2 + reexecute
272 }; 273 void write_bci_and_reexecute(int bci, bool reexecute) { write_int(((bci - InvocationEntryBci) << 1) + (reexecute ? 1 : 0)); }
274 };