[Python-Dev] Re: Another test_compiler mystery

[Jeremy Hylton]

On Tue, 10 Aug 2004 20:16:38 +0100, Armin Rigo <arigo at tunes.org> wrote:
> Also note that even though the compiler package may only have changed a bit,
> the parser C module definitely has, e.g. when genexprs and decorators were
> introduced.  I wonder what effect this has on the depth of concrete syntax
> trees.  I also wonder if the parser module tries to be safe again C stack
> overflow when building hugely nested data structures.

I don't think the compiler package has changed much at all, but it
consumes the deeply nested concrete syntax trees created by the parser
module.  The compiler.transformer module uses recursion a lot. 
Several releases ago I added some hacks to reduce the number of frames
(basically did tail call optimization by hand in a few spots).  It may
be that those hacks are no longer sufficient.

where's-that-ast-branch-when-you-need-it-ly y'rs,
Jeremy