[cffi-devel] void arg type

[Brad Anderson]

Hi all,

I'm having issues with using :void as a type in certain places.  I'm trying to wrap the following in CFFI:

struct _xmlAttribute {
    void           *_private;           /* application data */
    xmlElementType          type;       /* XML_ATTRIBUTE_DECL, must be second ! */
    const xmlChar          *name;       /* Attribute name */
    struct _xmlNode    *children;       /* NULL */
    struct _xmlNode        *last;       /* NULL */
    struct _xmlDtd       *parent;       /* -> DTD */
    struct _xmlNode        *next;       /* next sibling link  */
    struct _xmlNode        *prev;       /* previous sibling link  */
    struct _xmlDoc          *doc;       /* the containing document */

    struct _xmlAttribute  *nexth;       /* next in hash table */
    xmlAttributeType       atype;       /* The attribute type */
    xmlAttributeDefault      def;       /* the default */
    const xmlChar  *defaultValue;       /* or the default value */
    xmlEnumerationPtr       tree;       /* or the enumeration tree if any */
    const xmlChar        *prefix;       /* the namespace prefix if any */
    const xmlChar          *elem;       /* Element holding the attribute */
};

-----------------------------------------------

SWIG for CFFI produced:

(defcstruct _xmlAttribute
        (_private :void)
        (type :pointer)
        (name :unsigned-char)
        (children :pointer)
        (last :pointer)
        (parent :pointer)
        (next :pointer)
        (prev :pointer)
        (doc :pointer)
        (nexth :pointer)
        (atype :pointer)
        (def :pointer)
        (defaultValue :unsigned-char)
        (tree :pointer)
        (prefix :unsigned-char)
        (elem :unsigned-char))

-----------------------------------------------

And SBCL 0.9.7 produced:

cannot use values types here
   [Condition of type SIMPLE-ERROR]

Restarts:
  0: [RETRY] Retry performing #<ASDF:COMPILE-OP NIL {92EA579}> on #<ASDF:CL-SOURCE-FILE "libxml2" {92E6E89}>.
  1: [ACCEPT] Continue, treating #<ASDF:COMPILE-OP NIL {92EA579}> on #<ASDF:CL-SOURCE-FILE "libxml2" {92E6E89}>
as having been successful.
  2: [ABORT] Abort SLIME compilation.
  3: [ABORT-REQUEST] Abort handling SLIME request.
  4: [TERMINATE-THREAD] Terminate this thread (#<THREAD "repl-thread" {91B5D81}>)

Backtrace:
  0: (SB-ALIEN::ALIEN-VALUES-TYPE-TRANSLATOR (VALUES) #<NULL-LEXENV>)
  1: (CFFI-SYS:%FOREIGN-TYPE-ALIGNMENT :VOID)
  2: (CFFI::ADJUST-FOR-ALIGNMENT :VOID 0 :NORMAL T)
  3: (CFFI::NOTICE-FOREIGN-STRUCT-DEFINITION CL-LIBXML2::_XMLATTRIBUTE ((CL-LIBXML2::_PRIVATE :VOID) (TYPE
:POINTER) (CL-LIBXML2::NAME :UNSIGNED-CHAR) (CL-LIBXML2::CHILDREN :POINTER) (LAST :POINTER) (CL-LIBXML2::PARENT
:POIN$  4: (SB-INT:EVAL-IN-LEXENV (CFFI::NOTICE-FOREIGN-STRUCT-DEFINITION (QUOTE CL-LIBXML2::_XMLATTRIBUTE)
(QUOTE (# # # # # # # # # # ...))) #<NULL-LEXENV>)
  5: ((FLET SB-C::DEFAULT-PROCESSOR) (CFFI::NOTICE-FOREIGN-STRUCT-DEFINITION (QUOTE CL-LIBXML2::_XMLATTRIBUTE)
(QUOTE (# # # # # # # # # # ...))))
  6: (SB-C::PROCESS-TOPLEVEL-FORM (CFFI::NOTICE-FOREIGN-STRUCT-DEFINITION (QUOTE CL-LIBXML2::_XMLATTRIBUTE)
(QUOTE (# # # # # # # # # # ...))) ((EVAL-WHEN (:COMPILE-TOPLEVEL :LOAD-TOPLEVEL :EXECUTE)
(CFFI::NOTICE-FOREIGN-STR$  7: (SB-C::PROCESS-TOPLEVEL-PROGN ((CFFI::NOTICE-FOREIGN-STRUCT-DEFINITION (QUOTE
CL-LIBXML2::_XMLATTRIBUTE) (QUOTE #))) ((EVAL-WHEN (:COMPILE-TOPLEVEL :LOAD-TOPLEVEL :EXECUTE)
(CFFI::NOTICE-FOREIGN-STRUCT-DEFINITION # #)) $  8: (SB-C::PROCESS-TOPLEVEL-FORM (EVAL-WHEN (:COMPILE-TOPLEVEL
:LOAD-TOPLEVEL :EXECUTE) (CFFI::NOTICE-FOREIGN-STRUCT-DEFINITION (QUOTE CL-LIBXML2::_XMLATTRIBUTE) (QUOTE #)))
(SB-C::ORIGINAL-SOURCE-START 0 46) NIL)
  9: ((FLET SB-C::DEFAULT-PROCESSOR) (CFFI:DEFCSTRUCT CL-LIBXML2::_XMLATTRIBUTE (CL-LIBXML2::_PRIVATE :VOID)
(TYPE :POINTER) (CL-LIBXML2::NAME :UNSIGNED-CHAR) (CL-LIBXML2::CHILDREN :POINTER) (LAST :POINTER)
(CL-LIBXML2::PARE$ 10: (SB-C::PROCESS-TOPLEVEL-FORM (CFFI:DEFCSTRUCT CL-LIBXML2::_XMLATTRIBUTE
(CL-LIBXML2::_PRIVATE :VOID) (TYPE :POINTER) (CL-LIBXML2::NAME :UNSIGNED-CHAR) (CL-LIBXML2::CHILDREN :POINTER)
(LAST :POINTER) (CL-LIBXML2::PARENT $ 11: (SB-C::SUB-SUB-COMPILE-FILE #<SB-C::SOURCE-INFO >)
 12: ((LAMBDA NIL))
 13: (SB-C::%WITH-COMPILATION-UNIT #<CLOSURE (LAMBDA NIL) {934352D}>)
 14: (SB-C::SUB-COMPILE-FILE #<SB-C::SOURCE-INFO >)
 15: (COMPILE-FILE #P"/home/brad/dev/lisp/cl-libxml2/src/libxml2.lisp")
 16: ((SB-PCL::FAST-METHOD ASDF:PERFORM (ASDF:COMPILE-OP ASDF:CL-SOURCE-FILE)) #<unavailable argument>
#<unavailable argument> #<ASDF:COMPILE-OP NIL {92EA579}> #<ASDF:CL-SOURCE-FILE "libxml2" {92E6E89}>)
 17: ((LAMBDA (SB-PCL::.PV-CELL. SB-PCL::.NEXT-METHOD-CALL. SB-PCL::.ARG0. SB-PCL::.ARG1.)) #<unavailable
argument> #<unavailable argument> #<ASDF:COMPILE-OP NIL {92EA579}> #<ASDF:CL-SOURCE-FILE "libxml2" {92E6E89}>)
 18: ((LAMBDA NIL))
 19: (SB-C::%WITH-COMPILATION-UNIT #<CLOSURE (LAMBDA NIL) {932F0CD}>)


Thoughts?

Thanks,
Brad