Re: Two pass compiler for a language similar to Java

"J.H.Jongejan" <jjan@cs.rug.nl> wrote:
> Kamal R. Prasad wrote:
> > Joan Jesús Pujol Espinar <joanpujol@gmail.com> wrote
> >
> >
> >>I'm doing a pseudocode language similar to Java (it is posible to use
> >>things before are defined).


> > A procedural language does require a 2-pass compiler.


> Wirth actually designed the language in such a way that 1-pass would
> be possible.


Of course one of Wirth's design choices was precisely to require
things to be defined before use, if I'm not completely mistaken.


But perhaps a "fixup" method could be used? For function calls before
a function is defined, record the circumstances (apparent result and
argument types, and the location in the source), then when the
definition comes around, if it conflicts with recorded circumstances,
report an error at the original call occurrence. (Assume that the
definition is right and the call was wrong.)


-Lasse

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