RFR: 8256508: Improve CompileCommand flag

[Vladimir Kozlov]

On Tue, 17 Nov 2020 21:41:23 GMT, Nils Eliasson <neliasso at openjdk.org> wrote:

> The current implementation of compile command has two types of options. Types pre-defined options like "compileonly" and the general 'option' type.
> 
> 'option'-type are not defined, they can accidentally be used with the wrong value type, and the syntax is prone to error.
> 
> By pre-defining all compile commands used and giving them types the parsing can be simplified, proper parsing errors can be given and and reasonable syntax can be used.
> 
> This:
> -XX:CompileCommand=option,java/util/String.toString,int,RepeatCompilation,5
> 
> Is superseded by:
> -XX:CompileCommand=RepeatCompilation,java/util/String.toString,5
> 
> Attention check: Did you spot the error in the old command?
> 
> In order not to break anything - the old syntax is kept for now. But even the old command format is improved with verification for the option name and the type of the value.

Good.

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Marked as reviewed by kvn (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1276