RFR: 8167194: [JVMCI] no reliable mechanism for querying JVMCI system properties

[Doug Simon]

Thanks for the review!

> On 05 Oct 2016, at 22:21, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
> 
> Looks good.
> 
> thanks,
> Vladimir
> 
> On 10/5/16 1:03 PM, Doug Simon wrote:
>> 
>>> On 05 Oct 2016, at 21:10, Doug Simon <doug.simon at oracle.com> wrote:
>>> 
>>>> 
>>>> On 05 Oct 2016, at 20:49, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
>>>> 
>>>> On 10/5/16 11:34 AM, Doug Simon wrote:
>>>>> I chose system property because these properties are set with the command line system property syntax.
>>>> 
>>>> You mean "were set"? It use normal VM flag now.
>>> 
>>> No. The properties *are* still system properties (e.g., -Dgraal.PrintCompilation=true). The only non-standard way about how we use them is that they are accessed via VM.getSavedProperties() instead of System.getProperty() so that non-trusted code cannot influence JVMCI or Graal.
>>>> 
>>>>> I’d actually prefer shortening it to just “properties” if you think it doesn’t risk any ambiguity.
>>>> 
>>>> For me "shortening" is better - few bytes less in VM size :)
>>> 
>>> Ok, I’ll create a new webrev.
>> 
>> http://cr.openjdk.java.net/~dnsimon/8167194.v2/
>> 
>> -Doug
>>