RFR 8155674: Move javac towards a "by-file" compilation policy

Maurizio Cimadamore maurizio.cimadamore at oracle.com
Wed Dec 7 21:53:13 UTC 2016

On 07/12/16 20:19, Liam Miller-Cushon wrote:
> What do you think about pursuing this as an interim fix? It solves a 
> problem we were seeing trying to analyze entire compilation units 
> after flow, and it's harder to observe whether by-file is followed 
> correctly after that. Or would you rather just wait for the ordering 
> constraint to be removed in 10?
I think it's very possible that the ordering constraint will go away 
early in 10, so perhaps it's not a long wait - after all I think this 
patch would presumably be considered to risky to pursue at this stage in 9?

> On Sun, Dec 4, 2016 at 2:11 PM, Maurizio Cimadamore 
> <maurizio.cimadamore at oracle.com 
> <mailto:maurizio.cimadamore at oracle.com>> wrote:
>     Also don't forget that the cycle problem is temporary - as
>     discussed in that thread, the fix here is to actually get rid of
>     erasure (which is something we did already in an experimental
>     patch in Valhalla) which then removes the ordering problems with
>     supertypes/subtypes. We plan to do further experiments with this
>     in the Valhalla repo and move this code to 10 when ready.
>     Maurizio
>     On 02/12/16 02:18, Liam Miller-Cushon wrote:
>>     On Thu, Dec 1, 2016 at 6:06 PM, Jonathan Gibbons
>>     <jonathan.gibbons at oracle.com
>>     <mailto:jonathan.gibbons at oracle.com>> wrote:
>>         Does this address the potential problem with cycles that you
>>         mentioned in
>>         the original email?
>>     Not fully. It improves the current behaviour by ensuring files
>>     always go through attr and flow as a unit, but classes may still
>>     be desugared separately from their compilation unit.
>>     One of the test cases has compilation units [One, Two] and
>>     [Three, Four], where Two extends Four, and Three extends One.
>>     There's no way to linearize that so supertypes are desugared
>>     first and files are desugared as a unit.
>>     Are there still plans to removethe ordering constraint in TransTypes?

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