[Python-Dev] Re: Another test_compiler mystery (original) (raw)

Jeremy Hylton jhylton at gmail.com
Tue Aug 10 21:31:39 CEST 2004

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

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