RFR: 8200106: Move NoSafepointVerifier out from gcLocker.hpp

[Stefan Karlsson]

On 2018-03-22 19:33, coleen.phillimore at oracle.com wrote:
>
> http://cr.openjdk.java.net/~stefank/8200106/webrev.01/src/hotspot/share/runtime/interfaceSupport.hpp.html 
>
>
> This is really interesting. I never noticed this buried in gcLocker.  
> I think this should probably go in interfaceSupport.inline.hpp like 
> all the classes that are only used there instead, unless you think it 
> should be used on its own.  I'm not sure about that.

I can move that.
>
> http://cr.openjdk.java.net/~stefank/8200106/webrev.01/src/hotspot/share/gc/shared/gcLocker.cpp.udiff.html 
>
>
> This seems strange to have another is_at_safepoint function.   I don't 
> see why you changed this as is_at_safepoint is inlined in safepoint.hpp.

I did that so that we wouldn't have to include safepoint.hpp in 
gcLocker.hpp, just to be able to do an assert.

>
> http://cr.openjdk.java.net/~stefank/8200106/webrev.01/src/hotspot/share/gc/shared/gcLocker.inline.hpp.udiff.html 
>
>
> I thought the inline keyword should be on both declaration and 
> definition (?)  Do we need these functions to be inlined anyway? Can 
> we put them in gcLocker.cpp and remove the .inline file.  It looks 
> like the inline file is not included in most places anyway with this 
> change.

You can have it either at the declaration or the definition. The benefit 
of having it on the declaration is that the compiler will complain 
instead of the linker. This might be performance sensitive, so I didn't 
want to risk moving it to the .cpp file.

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> http://cr.openjdk.java.net/~stefank/8200106/webrev.01/src/hotspot/share/runtime/interfaceSupport.cpp.udiff.html 
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>
> nit, can you add // ASSERT to the #endif ?

Sure.

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> http://cr.openjdk.java.net/~stefank/8200106/webrev.01/src/hotspot/share/runtime/safepointVerifiers.hpp.html 
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>
> I like this and the name seems Ok.  This will be a lot easier to find 
> than in GCLocker.  Thank you for this change.

Thanks! I'll make the changes and will send out a new webrev.

StefanK
>
> Coleen
>
>
> On 3/22/18 12:26 PM, Stefan Karlsson wrote:
>> This patch builds upon the changes in:
>> http://mail.openjdk.java.net/pipermail/hotspot-dev/2018-March/030928.html 
>>
>>
>> StefanK
>>
>> On 2018-03-22 17:24, Stefan Karlsson wrote:
>>> Hi all,
>>>
>>> Please review this patch to separate out the NoSafepointVerifier 
>>> class (and friends) from gcLocker.hpp into its own file.
>>>
>>> http://cr.openjdk.java.net/~stefank/8200106/webrev.01
>>> https://bugs.openjdk.java.net/browse/JDK-8200106
>>>
>>> After this patch gcLocker.hpp only contains code for the GCLocker. 
>>> I've gone through all usages of the GCCLocker and 
>>> NoSafepointVerifier classes and changed the code to include the 
>>> correct headers.
>>>
>>> The new files are names safepointVerifiers.hpp/cpp and the main 
>>> class is NoSafepointVerifier. However, I also moved the 
>>> NoGCVerifier, which is the parent class of NoSafepointVerifier, and 
>>> NoAllocVerfier. I think all of these are used to verify that we 
>>> don't do things that will interact badly with safepoints, hence the 
>>> name of the new file. Are others OK with the name?
>>>
>>> Thanks,
>>> StefanK
>