RFR: 8146800: Reorganize logging alias code.

[Max Ockner]

David,
Originally, VAR_LOG_TAGS was included to help use the configure_stdout 
function. Marcus has suggested that I don't need it so I have removed it.
New webrev: http://cr.openjdk.java.net/~mockner/aliastable.04/
Thanks,
Max
On 1/12/2016 1:31 AM, David Holmes wrote:
> Hi Max,
>
> On 12/01/2016 3:02 AM, Max Ockner wrote:
>> Hello all,
>> Please review my fix which reorganizes the alias table for Unified 
>> Logging.
>>
>> bug: https://bugs.openjdk.java.net/browse/JDK-8146800
>> webrev: http://cr.openjdk.java.net/~mockner/aliastable.03/
>
> Is this supposed to contain the VAR_LOG_TAGS changes?
>
> Is the "deprecation" of the converted tracing flags still to be added?
>
> Otherwise seems okay.
>
> Thanks,
> David
>
>> Summary:
>> How logging aliases used to handled - At the beginning of
>> parse_each_vm_init_arg() in arguments.cpp, each "-XX" argument would be
>> looked up in the logging alias table to see if there was a match. If a
>> match was found, then the entire argument would be replaced by a
>> corresponding unified logging argument. This argument would then cascade
>> through the giant case structure until it was caught and handled close
>> to the bottom of parse_each_vm_init_arg (which happens hundreds of lines
>> later).
>>
>> There is a section of code that handles aliases and deprecation for -XX
>> options already. After this fix, logging aliases will be handled here
>> instead of substituting entire logging expressions at the beginning of
>> parse_each_vm_init_arg.
>>
>> Tested with jtreg runtime tests. This includes several logging tests for
>> recently aliased flags.
>>
>> Thanks,
>> Max
>>