Request for review (S) 6780143: hs203t003 hits SIGSEGV/EXCEPTION_ACCESS_VIOLATION with -XX:+UseCompressedOops

[Vladimir Kozlov]

Coleen,

Looks goor but could you explain why you removed saving RCX in templateTable_x86_64.cpp?

Thanks,
Vladimir

Coleen Phillimore wrote:
> 
> Thanks to Tom for pointing out what was really killing r12, I have a new 
> webrev with a better fix and better summary.
> 
> Summary: Using r12 as temporary register around call_VM trashes heapbase 
> because call_VM doesn't always return immediately to following code (eg 
> forward_exception, popframe and early return support).
> 
> open webrev at http://cr.openjdk.java.net/~coleenp/6780143/   (hit reload)
> bug link at http://bugs.sun.com/view_bug.do?bug_id=6780143
> 
> Thanks,
> Coleen
> 
> Tom Rodriguez wrote:
>> The changes look ok but what code was killing r12?  All the existing 
>> reinit_heapbase calls are because we're using the callee-saved-ness of 
>> r12 to keep something else alive but that's no true here.
>>
>> tom
>>
>> On Nov 18, 2010, at 12:20 PM, coleen phillimore wrote:
>>
>>  
>>> Summary: missing reinit_heapbase() when popframe support jumps back 
>>> into interpreter from C code.
>>>
>>> open webrev at http://cr.openjdk.java.net/~coleenp/6780143/
>>> bug link at http://bugs.sun.com/view_bug.do?bug_id=6780143
>>>
>>> Tested by running our jvmti tests including the failing test.
>>>
>>> Coleen
>>>     
>>
>>