Hello, Today is the first anniversary of GNU Guile 2.0 [0]. To celebrate it, several Guile users took on the challenge to come up in one week with a neat hack to showcase Guile integration [1].
So I’m happy to announce that this silly challenge gave birth (among other things) to Guile-GCC, Guile bindings that allow GCC plug-ins to be written in Guile: http://www.fdn.fr/~lcourtes/software/guile/guile-gcc-0.0.tar.gz http://www.fdn.fr/~lcourtes/software/guile/guile-gcc-0.0.tar.gz.asc SHA1 sums: 2d46faf75b5ceb62c326f320495aa594479468bf guile-gcc-0.0.tar.gz 7f0817e1b8b4a35f0a99602a8d9c1b080fea1851 guile-gcc-0.0.tar.gz.asc Repository: https://gitorious.org/guile-gcc/guile-gcc The plug-in currently wraps a small subset of the libcpp, tree, and cgraph APIs, which was enough to create these plug-ins available in the distribution: • The ‘birthday’ plug-in defines a ‘birthday’ pragma that emits a ‘puts’ call. • ‘meta’ shows an unprecedented way of doing meta-programming from C. It defines two pragmas: one to define a “meta-function”, and one to invoke said function at a particular point in the code, with specific tree objects as its arguments. The ‘examples/meta.c’ file defines a meta-function that generates code to print the value of each field of the structure passed as its argument. • ‘call-graph’ unimaginatively traverses the call graph of the compilation unit and emits a ‘dot’ representation of that graph. The (gcc) module comes with an embedded domain-specific language (EDSL) that makes it easy to write code-generating code. For instance: (tree loc (printf "value is %d (%p)\n" (foo dot "bar") (& foo))) … expands to (simplified): (build-call-expr loc printf (list (build-string-literal "value is %d (%p)\n") (build-component-ref loc foo "bar") (build-addr foo))) The bindings currently lack GIMPLE and basic-blocks. Everyone is invited to join in and help with this. :-) Besides, fun work would include augmenting the tree EDSL so it can build BIND_EXPRs, VAR_DECLs, COND_EXPRs, etc., and extending Guile’s (ice-9 match) pattern matcher to support tree and GIMPLE objects, which would probably be handy. Feedback welcome! Thanks, Ludo’. [0] http://lists.gnu.org/archive/html/guile-devel/2011-02/msg00173.html [1] http://lists.gnu.org/archive/html/guile-user/2012-02/msg00019.html
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