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

[Aleksey Shipilev]

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?

Was:

 308   if (UseG1GC)            return "g1 gc";
 309   if (UseParallelGC)      return "parallel gc";
 310   if (UseConcMarkSweepGC) return "concurrent mark sweep gc";
 311   if (UseSerialGC)        return "serial gc";

Now:

  57   SupportedGC(UseSerialGC,        CollectedHeap::Serial,   serialArguments,   "serialgc"  ),
  59   SupportedGC(UseParallelGC,      CollectedHeap::Parallel, parallelArguments, "parallelgc"),
  60   SupportedGC(UseParallelOldGC,   CollectedHeap::Parallel, parallelArguments, "parallelgc"),
  61   SupportedGC(UseConcMarkSweepGC, CollectedHeap::CMS,      cmsArguments,      "cmsgc"     ),
  62   SupportedGC(UseG1GC,            CollectedHeap::G1,       g1Arguments,       "g1gc"      ),

-Aleksey

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