RFR: 8202364: Add GCConfig::hs_err_name() to avoid GC-specific code in error reporting

[Aleksey Shipilev]

On 04/27/2018 11:48 AM, Per Liden wrote:
> On 04/27/2018 11:40 AM, Aleksey Shipilev wrote:
>> On 04/27/2018 11:39 AM, Aleksey Shipilev wrote:
>>> On 04/27/2018 11:33 AM, Per Liden wrote:
>>>> The gc_mode() function in vmErrror.cpp currently tests which Use*GC flag is set and translates that
>>>> into a name. We should instead call into GCConfig to get the name. This patch adds a new function
>>>> (GCConfig::hs_err_name) for this purpose. This is not placed on CollectedHeap, since we might need
>>>> this name before a CollectedHeap instance has been created, e.g. if we crash during VM startup.
>>>>
>>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8202364
>>>> Webrev: http://cr.openjdk.java.net/~pliden/8202364/webrev.0
>>>
>>> Looks good.
>>
>> Wait, except you want to keep the human-readable?
> 
> I though it looked ugly with the space so I removed it. I don't think it makes it less readable.

The line where GC name is injected already have spaces:

Java VM: OpenJDK Server VM (slowdebug 10-internal+0-adhoc.user.shenandoah-jdk10, mixed mode, tiered,
g1 gc, linux-x86)

I prefer not to change formatting unless there is very compelling reason to do so.

-Aleksey

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