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Diffstat (limited to 'doc/lispref/internals.texi')
| -rw-r--r-- | doc/lispref/internals.texi | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/doc/lispref/internals.texi b/doc/lispref/internals.texi index ee3463a1fd6..a5480a9bf8a 100644 --- a/doc/lispref/internals.texi +++ b/doc/lispref/internals.texi @@ -1374,6 +1374,15 @@ objects between Emacs and the module (@pxref{Module Values}). The provides facilities for conversion between basic C data types and the corresponding @code{emacs_value} objects. +In the module function's body, do @emph{not} attempt to access +elements of the @var{args} array beyond the index +@code{@var{nargs}-1}: memory for the @var{args} array is allocated +exactly to accommodate @var{nargs} values, and accessing beyond that +will most probably crash your module. In particular, if the value of +@var{nargs} passed to the function at run time is zero, it must not +access @var{args} at all, as no memory will have been allocated for it +in that case. + A module function always returns a value. If the function returns normally, the Lisp code which called it will see the Lisp object corresponding to the @code{emacs_value} value the function returned. |