Front-end Trees

[Harry Goulding]

Hi All,

I'm writing a front-end to gcc for a very simple programming language using 
flex, bison and gcc.

Just wondering if its possible to print out to stdio the tree that's created 
using gcc's macros.

Also i want to do some simple optimizations such as constant folding, 
arithmetic simplifications.
Does anyone know where i could find some info to do this:
1) Like is it best to do them during parsing.
2) Is it better to construct the tree and then do the optimizations on the 
tree (and does gcc provide some useful functions to do these optimizations 
on the tree)

Cheers Harry

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