Hi Rajath,
On 03/17/16 13:30, Rajath Shashidhara wrote:
> ......
> [1] Why is the module "Futures" referenced in the mail above not used
> currently ?
> Are there any particular flaws in this module ? This will help me
> identify the pitfalls and understand how my implementation must be
> different from it.
It is not used because its implementation has not reached the state where we
are happy to merge it onto our master branch.
Also its implementation is based on lambda constructs. If possible, we would
like to avoid relying on lambdas because it is not a well-implemented feature
at the moment.
> [2] Is there any reason behind why "single" qualifier is not supported
> for record types ?
> i.e., Is it not implemented or is it not supported deliberately for
> some reason ?
Good question. It is deliberate because we do not have a good answer to the
following scenario:
Consider a record r with fields x,y,z. Let is have a "single" type and not be
"full" yet. Say you execute r.x = 5. Should that make r be "full" ?
> [3] What work needs to be done on the run-time library for begin
> expressions support ?
> As Michael has stated in the previous mail, the library is
> thread-safe. If thread-safety is not the problem, I can't think of any
> other problem.
I do not see anything immediately. I cannot guarantee that it will not surface
during the course of the project.
> [4] Can begin expressions contain blocks ? i.e., a = begin {z=fn(b);
> fn1(z)} + begin fn(c); [...]
That will surely be valuable.
> Aside:
> Is there a way to print the AST produced by the compiler ?
When you are executing the compiler from the debugger, you can use the
functions print_view, list_view et al. passing them either a pointer to BaseAST
or an integer node ID as argument. We have a couple of handy gdb aliases in
compiler/etc/gdb.commands
Otherwise there is the option -d or --log that you can pass to the compiler
(see chpl --help --devel for more details and related options). It will create
a bunch of per-pass per-module files in the log directory.
Vassily
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