RFR: 8255452: Doing GC during JVMTI MethodExit event posting breaks return oop [v2]

[Serguei Spitsyn]

On Mon, 2 Nov 2020 17:52:58 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

>> src/hotspot/share/prims/jvmtiExport.cpp line 1570:
>> 
>>> 1568:   // return a flag when a method terminates by throwing an exception
>>> 1569:   // i.e. if an exception is thrown and it's not caught by the current method
>>> 1570:   bool exception_exit = state->is_exception_detected() && !state->is_exception_caught();
>> 
>> So this only applies to the case where the post_method_exit comes from remove_activation?  Good to have it only on this path in this case.
>
> I'm not sure. There might be other cases, when remove_activation is called by the exception code. That's why I didn't want to change it to just true in this path.

The post_method_exit can come from Zero interpreter:
src/hotspot/share/interpreter/zero/bytecodeInterpreter.cpp:            
     CALL_VM_NOCHECK(InterpreterRuntime::post_method_exit(THREAD));

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PR: https://git.openjdk.java.net/jdk/pull/930