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6833129: specjvm98 fails with NullPointerException in the compiler with -XX:DeoptimizeALot

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Developed a reexecute logic for the interpreter to reexecute the bytecode when deopt happens

Reviewed-by: kvn, never, jrose, twisti
This commit is contained in:
Changpeng Fang 2009-07-31 17:12:33 -07:00
parent f2ea22a547
commit ae00753bf7
29 changed files with 465 additions and 241 deletions
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6
hotspot/src/share/vm/code/debugInfo.hpp
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@ -255,7 +255,8 @@ class DebugInfoReadStream : public CompressedReadStream {
ScopeValue* read_object_value();
ScopeValue* get_cached_object();
// BCI encoding is mostly unsigned, but -1 is a distinguished value
int read_bci() { return read_int() + InvocationEntryBci; }
// Decoding based on encoding: bci = InvocationEntryBci + read_int()/2; reexecute = read_int()%2 == 1 ? true : false;
int read_bci_and_reexecute(bool& reexecute) { int i = read_int(); reexecute = (i & 1) ? true : false; return (i >> 1) + InvocationEntryBci; }
};
// DebugInfoWriteStream specializes CompressedWriteStream for
@ -268,5 +269,6 @@ class DebugInfoWriteStream : public CompressedWriteStream {
public:
DebugInfoWriteStream(DebugInformationRecorder* recorder, int initial_size);
void write_handle(jobject h);
void write_bci(int bci) { write_int(bci - InvocationEntryBci); }
//Encoding bci and reexecute into one word as (bci - InvocationEntryBci)*2 + reexecute
void write_bci_and_reexecute(int bci, bool reexecute) { write_int(((bci - InvocationEntryBci) << 1) + (reexecute ? 1 : 0)); }
};