Re: any static state in scala.tools.nsc.Global?

On 03/25/2016 05:11 AM, P. Oscar Boykin wrote:
> The name scares me that it might be squirreling away some state, but 
> if I were to instantiate this:
>
> https://github.com/scala/scala/blob/2.11.x/src/compiler/scala/tools/nsc/Global.scala
>
> and pass it the same options the command line wound have in scalac, 
> can I expect that all state is reset on each new instantiation?
>
> What I am really trying to do is be able to get the jit to run on the 
> code, leave a compiler resident and have it compile without one run 
> changing the state of the next (for the bazel build 
> system: https://github.com/bazelbuild/rules_scala ). Bazel's model 
> makes zinc integration a challenge (maybe doable, but this is a first 
> step anyway).
>
> Any feedback on what I am trying to do would be great.
Multiple instances of Global should be safe. Can't say if it is 100% 
safe, maybe there is some state leaked somewhere but I never had a 
problem with multiple instances of Global. A single instance however is 
not safe to use because it leaks a lot of state internally, which means 
if you compile the same code twice by the same Global it may happen that 
the first time it works fine and the second time it doesn't. From a 
design point of view, using a new instance of Global is the way to go. 
However, since you have to pay a huge startup time for every creation of 
Global it can be necessary to reuse Global and pay for additional 
implementation complexity. But that depends on your use case.
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