The Guile interpreter is based on Aubrey Jaffer's SCM interpreter (see section `Overview' in SCM: a portable Scheme interpreter) with some modifications to make it suitable as an embedded interpreter, and further modifications as Guile evolves.
Part of the modification has been to provide a restricted interface to
limit access to the SCM internals; this is called the gh_
interface, or libguile interface.
If you are programming with Guile, you should only use the C
subroutines described in this manual, which all begin with
gh_.
If instead you are extending Guile, you have the entire SCM source to play with. This manual will not help you at all, but you can consult Aubrey Jaffer's SCM manual (see section `Internals' in SCM: a portable Scheme interpreter).
If you are adding a module to Guile, I recommend that you stick
to the gh_ interface: this interface is guaranteed to not
change drastically, while the SCM internals might change as Guile is
developed.
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