; vim: ft=scheme

(c-system-include "stdint.h")
(c-system-include "dlfcn.h")
(c-system-include "ffi.h")

;; pffi-size-of
(c-declare "
    int size_of_int8_t() { return sizeof(int8_t); }
    int size_of_uint8_t() { return sizeof(uint8_t); }
    int size_of_int16_t() { return sizeof(int16_t); }
    int size_of_uint16_t() { return sizeof(uint16_t); }
    int size_of_int32_t() { return sizeof(int32_t); }
    int size_of_uint32_t() { return sizeof(uint32_t); }
    int size_of_int64_t() { return sizeof(int64_t); }
    int size_of_uint64_t() { return sizeof(uint64_t); }
    int size_of_char() { return sizeof(char); }
    int size_of_unsigned_char() { return sizeof(unsigned char); }
    int size_of_short() { return sizeof(short); }
    int size_of_unsigned_short() { return sizeof(unsigned short); }
    int size_of_int() { return sizeof(int); }
    int size_of_unsigned_int() { return sizeof(unsigned int); }
    int size_of_long() { return sizeof(long); }
    int size_of_unsigned_long() { return sizeof(unsigned long); }
    int size_of_float() { return sizeof(float); }
    int size_of_double() { return sizeof(double); }
    int size_of_pointer() { return sizeof(void*); }
")

(define-c int (size-of-int8_t size_of_int8_t) ())
(define-c int (size-of-uint8_t size_of_uint8_t) ())
(define-c int (size-of-int16_t size_of_int16_t) ())
(define-c int (size-of-uint16_t size_of_uint16_t) ())
(define-c int (size-of-int32_t size_of_int32_t) ())
(define-c int (size-of-uint32_t size_of_uint32_t) ())
(define-c int (size-of-int64_t size_of_int64_t) ())
(define-c int (size-of-uint64_t size_of_uint64_t) ())
(define-c int (size-of-char size_of_char) ())
(define-c int (size-of-unsigned-char size_of_unsigned_char) ())
(define-c int (size-of-short size_of_short) ())
(define-c int (size-of-unsigned-short size_of_unsigned_short) ())
(define-c int (size-of-int size_of_int) ())
(define-c int (size-of-unsigned-int size_of_unsigned_int) ())
(define-c int (size-of-long size_of_long) ())
(define-c int (size-of-unsigned-long size_of_unsigned_long) ())
(define-c int (size-of-float size_of_float) ())
(define-c int (size-of-double size_of_double) ())
(define-c int (size-of-pointer size_of_pointer) ())

;; pffi-shape-object-load
(define-c-const int (RTLD-NOW "RTLD_NOW"))
(define-c (maybe-null pointer void*) dlopen (string int))
(define-c (maybe-null pointer void*) dlerror ())

(c-declare "void* pointer_null() { return NULL; }")
(define-c (pointer void*) (pointer-null pointer_null) ())

(c-declare "int is_pointer_null(void* pointer) { if(pointer == NULL) { return 1; } else { return 0; }; }")
(define-c bool (is-pointer-null is_pointer_null) ((maybe-null pointer void*)))

(c-declare "void* pointer_allocate(int size) { return malloc(size); }")
(define-c (maybe-null pointer void*) (pointer-allocate pointer_allocate) (int))

(c-declare "sexp is_pointer(struct sexp_struct* object) {
           if(sexp_cpointerp(object)) {
              return SEXP_TRUE;
           } else {
              return SEXP_FALSE;
           }
           }")
(define-c sexp (pointer? is_pointer) (sexp))

(c-declare "intptr_t pointer_address(struct sexp_struct* pointer) {
            return (intptr_t)&sexp_cpointer_value(pointer);
           }")
(define-c uint32_t (pointer-address pointer_address) (sexp))

(c-declare "void pointer_free(void* pointer) { free(pointer); }")
(define-c void (pointer-free pointer_free) ((maybe-null pointer void*)))

;; pffi-pointer-set!
(c-declare "void pointer_set_c_int8_t(void* pointer, int offset, int8_t value) { *(int8_t*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-int8_t! pointer_set_c_int8_t) ((pointer void*) int int8_t))
(c-declare "void pointer_set_c_uint8_t(void* pointer, int offset, uint8_t value) { *(uint8_t*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-uint8_t! pointer_set_c_uint8_t) ((pointer void*) int uint8_t))

(c-declare "void pointer_set_c_int16_t(void* pointer, int offset, int16_t value) { *(int16_t*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-int16_t! pointer_set_c_int16_t) ((pointer void*) int int16_t))
(c-declare "void pointer_set_c_uint16_t(void* pointer, int offset, uint16_t value) { *(uint16_t*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-uint16_t! pointer_set_c_uint16_t) ((pointer void*) int uint16_t))

(c-declare "void pointer_set_c_int32_t(void* pointer, int offset, int32_t value) { *(int32_t*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-int32_t! pointer_set_c_int32_t) ((pointer void*) int int32_t))
(c-declare "void pointer_set_c_uint32_t(void* pointer, int offset, uint32_t value) { *(uint32_t*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-uint32_t! pointer_set_c_uint32_t) ((pointer void*) int uint32_t))

(c-declare "void pointer_set_c_int64_t(void* pointer, int offset, int64_t value) { *(int64_t*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-int64_t! pointer_set_c_int64_t) ((pointer void*) int int64_t))
(c-declare "void pointer_set_c_uint64_t(void* pointer, int offset, uint64_t value) { *(uint64_t*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-uint64_t! pointer_set_c_uint64_t) ((pointer void*) int uint64_t))

(c-declare "void pointer_set_c_char(void* pointer, int offset, char value) { *((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-char! pointer_set_c_char) ((pointer void*) int char))
(c-declare "void pointer_set_c_unsigned_char(void* pointer, int offset, unsigned char value) { *(unsigned char*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-unsigned-char! pointer_set_c_unsigned_char) ((pointer void*) int unsigned-char))

(c-declare "void pointer_set_c_short(void* pointer, int offset, short value) { *(short*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-short! pointer_set_c_short) ((pointer void*) int short))
(c-declare "void pointer_set_c_unsigned_short(void* pointer, int offset, unsigned short value) { *(unsigned short*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-unsigned-short! pointer_set_c_unsigned_short) ((pointer void*) int unsigned-short))

(c-declare "void pointer_set_c_int(void* pointer, int offset, int value) { *(int*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-int! pointer_set_c_int) ((pointer void*) int int))
(c-declare "void pointer_set_c_unsigned_int(void* pointer, int offset, unsigned int value) { *(unsigned int*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-unsigned-int! pointer_set_c_unsigned_int) ((pointer void*) int unsigned-int))

(c-declare "void pointer_set_c_long(void* pointer, int offset, long value) { *(long*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-long! pointer_set_c_long) ((pointer void*) int long))
(c-declare "void pointer_set_c_unsigned_long(void* pointer, int offset, unsigned long value) { *(unsigned long*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-unsigned-long! pointer_set_c_unsigned_long) ((pointer void*) int unsigned-long))

(c-declare "void pointer_set_c_float(void* pointer, int offset, float value) { *(float*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-float! pointer_set_c_float) ((pointer void*) int float))

(c-declare "void pointer_set_c_double(void* pointer, int offset, double value) { *(double*)((char*)pointer + offset) = value; }")
(define-c void (pointer-set-c-double! pointer_set_c_double) ((pointer void*) int double))

(c-declare "void pointer_set_c_pointer(void* pointer, int offset, void* value) { char* p = (char*)pointer + offset; *(char**)p = value; }")
(define-c void (pointer-set-c-pointer! pointer_set_c_pointer) ((pointer void*) int (maybe-null pointer void*)))

;; pffi-pointer-get
(c-declare "int8_t pointer_ref_c_int8_t(void* pointer, int offset) { return *(int8_t*)((char*)pointer + offset); }")
(define-c int8_t (pointer-ref-c-int8_t pointer_ref_c_int8_t) ((pointer void*) int))
(c-declare "uint8_t pointer_ref_c_uint8_t(void* pointer, int offset) { return *(uint8_t*)((char*)pointer + offset); }")
(define-c uint8_t (pointer-ref-c-uint8_t pointer_ref_c_uint8_t) ((pointer void*) int))

(c-declare "int16_t pointer_ref_c_int16_t(void* pointer, int offset) { return *(int16_t*)((char*)pointer + offset); }")
(define-c int16_t (pointer-ref-c-int16_t pointer_ref_c_int16_t) ((pointer void*) int))
(c-declare "uint16_t pointer_ref_c_uint16_t(void* pointer, int offset) { return *(uint16_t*)((char*)pointer + offset); }")
(define-c uint16_t (pointer-ref-c-uint16_t pointer_ref_c_uint16_t) ((pointer void*) int))

(c-declare "int32_t pointer_ref_c_int32_t(void* pointer, int offset) { return *(int32_t*)((char*)pointer + offset); }")
(define-c int32_t (pointer-ref-c-int32_t pointer_ref_c_int32_t) ((pointer void*) int))
(c-declare "uint32_t pointer_ref_c_uint32_t(void* pointer, int offset) { return *(uint32_t*)((char*)pointer + offset); }")
(define-c uint32_t (pointer-ref-c-uint32_t pointer_ref_c_uint32_t) ((pointer void*) int))

(c-declare "int64_t pointer_ref_c_int64_t(void* pointer, int offset) { return *(int64_t*)((char*)pointer + offset); }")
(define-c int64_t (pointer-ref-c-int64_t pointer_ref_c_int64_t) ((pointer void*) int))
(c-declare "uint64_t pointer_ref_c_uint64_t(void* pointer, int offset) { return *(uint64_t*)((char*)pointer + offset); }")
(define-c uint64_t (pointer-ref-c-uint64_t pointer_ref_c_uint64_t) ((pointer void*) int))

(c-declare "char pointer_ref_c_char(void* pointer, int offset) { return *(char*)((char*)pointer + offset); }")
(define-c char (pointer-ref-c-char pointer_ref_c_char) ((pointer void*) int))
(c-declare "unsigned char pointer_ref_c_unsigned_char(void* pointer, int offset) { return *(unsigned char*)((char*)pointer + offset); }")
(define-c unsigned-char (pointer-ref-c-unsigned-char pointer_ref_c_unsigned_char) ((pointer void*) int))

(c-declare "short pointer_ref_c_short(void* pointer, int offset) { return *(short*)((char*)pointer + offset); }")
(define-c short (pointer-ref-c-short pointer_ref_c_short) ((pointer void*) int))
(c-declare "unsigned short pointer_ref_c_unsigned_short(void* pointer, int offset) { return *(unsigned short*)((char*)pointer + offset); }")
(define-c unsigned-short (pointer-ref-c-unsigned-short pointer_ref_c_unsigned_short) ((pointer void*) int))

(c-declare "int pointer_ref_c_int(void* pointer, int offset) { return *(int*)((char*)pointer + offset); }")
(define-c int (pointer-ref-c-int pointer_ref_c_int) ((pointer void*) int))
(c-declare "unsigned int pointer_ref_c_unsigned_int(void* pointer, int offset) { return *(unsigned int*)((char*)pointer + offset); }")
(define-c unsigned-int (pointer-ref-c-unsigned-int pointer_ref_c_unsigned_int) ((pointer void*) int))

(c-declare "long pointer_ref_c_long(void* pointer, int offset) { return *(long*)((char*)pointer + offset); }")
(define-c long (pointer-ref-c-long pointer_ref_c_long) ((pointer void*) long))
(c-declare "unsigned long pointer_ref_c_unsigned_long(void* pointer, int offset) { return *(unsigned long*)((char*)pointer + offset); }")
(define-c unsigned-long (pointer-ref-c-unsigned-long pointer_ref_c_unsigned_long) ((pointer void*) int))

(c-declare "float pointer_ref_c_float(void* pointer, int offset) { return *(float*)((char*)pointer + offset); }")
(define-c float (pointer-ref-c-float pointer_ref_c_float) ((pointer void*) int))

(c-declare "double pointer_ref_c_double(void* pointer, int offset) { return *(double*)((char*)pointer + offset); }")
(define-c double (pointer-ref-c-double pointer_ref_c_double) ((pointer void*) int))

(c-declare "void* pointer_ref_c_pointer(void* pointer, int offset) { char* p = (char*)pointer + offset; return *(char**)p; }")
(define-c (maybe-null pointer void*) (pointer-ref-c-pointer pointer_ref_c_pointer) ((pointer void*) int))

;; pffi-string->pointer
;(c-declare "void* string_to_pointer(char* string) { return (void*)string; }")
;(define-c (maybe-null pointer void*) (string-to-pointer string_to_pointer) (string))

;; pffi-pointer->string
;(c-declare "char* pointer_to_string(void* pointer) { return (char*)pointer; }")
;(define-c string (pointer-to-string pointer_to_string) ((maybe-null pointer void*)))

;; pffi-define

(c-declare "ffi_cif cif;")
(define-c (pointer void*) dlsym ((maybe-null pointer void*) string))

(c-declare "void* get_ffi_type_int8() { return &ffi_type_sint8; }")
(define-c (pointer void*) (get-ffi-type-int8 get_ffi_type_int8) ())
(c-declare "void* get_ffi_type_uint8() { return &ffi_type_uint8; }")
(define-c (pointer void*) (get-ffi-type-uint8 get_ffi_type_uint8) ())

(c-declare "void* get_ffi_type_int16() { return &ffi_type_sint16; }")
(define-c (pointer void*) (get-ffi-type-int16 get_ffi_type_int16) ())
(c-declare "void* get_ffi_type_uint16() { return &ffi_type_uint16; }")
(define-c (pointer void*) (get-ffi-type-uint16 get_ffi_type_uint16) ())

(c-declare "void* get_ffi_type_int32() { return &ffi_type_sint32; }")
(define-c (pointer void*) (get-ffi-type-int32 get_ffi_type_int32) ())
(c-declare "void* get_ffi_type_uint32() { return &ffi_type_uint32; }")
(define-c (pointer void*) (get-ffi-type-uint32 get_ffi_type_uint32) ())

(c-declare "void* get_ffi_type_int64() { return &ffi_type_sint64; }")
(define-c (pointer void*) (get-ffi-type-int64 get_ffi_type_int64) ())
(c-declare "void* get_ffi_type_uint64() { return &ffi_type_uint64; }")
(define-c (pointer void*) (get-ffi-type-uint64 get_ffi_type_uint64) ())

(c-declare "void* get_ffi_type_char() { return &ffi_type_schar; }")
(define-c (pointer void*) (get-ffi-type-char get_ffi_type_char) ())
(c-declare "void* get_ffi_type_uchar() { return &ffi_type_uchar; }")
(define-c (pointer void*) (get-ffi-type-uchar get_ffi_type_uchar) ())

(c-declare "void* get_ffi_type_short() { return &ffi_type_sshort; }")
(define-c (pointer void*) (get-ffi-type-short get_ffi_type_short) ())
(c-declare "void* get_ffi_type_ushort() { return &ffi_type_ushort; }")
(define-c (pointer void*) (get-ffi-type-ushort get_ffi_type_ushort) ())

(c-declare "void* get_ffi_type_int() { return &ffi_type_sint; }")
(define-c (pointer void*) (get-ffi-type-int get_ffi_type_int) ())
(c-declare "void* get_ffi_type_uint() { return &ffi_type_uint; }")
(define-c (pointer void*) (get-ffi-type-uint get_ffi_type_uint) ())

(c-declare "void* get_ffi_type_long() { return &ffi_type_slong; }")
(define-c (pointer void*) (get-ffi-type-long get_ffi_type_long) ())

(c-declare "void* get_ffi_type_ulong() { return &ffi_type_ulong; }")
(define-c (pointer void*) (get-ffi-type-ulong get_ffi_type_ulong) ())

(c-declare "void* get_ffi_type_float() { return &ffi_type_float; }")
(define-c (pointer void*) (get-ffi-type-float get_ffi_type_float) ())

(c-declare "void* get_ffi_type_double() { return &ffi_type_double; }")
(define-c (pointer void*) (get-ffi-type-double get_ffi_type_double) ())

(c-declare "void* get_ffi_type_void() { return &ffi_type_void; }")
(define-c (pointer void*) (get-ffi-type-void get_ffi_type_void) ())

(c-declare "void* get_ffi_type_pointer() { return &ffi_type_pointer; }")
(define-c (pointer void*) (get-ffi-type-pointer get_ffi_type_pointer) ())

(define-c-const int (FFI-OK "FFI_OK"))
(c-declare
  "int internal_ffi_prep_cif(unsigned int nargs, void* rtype, void* atypes[]) {
    printf(\"A1: %u, A2: %u, nargs: %u\\n\", &ffi_type_pointer, atypes[0], nargs);
    return ffi_prep_cif(&cif, FFI_DEFAULT_ABI, nargs, (ffi_type*)rtype, (ffi_type**)atypes);
  }")
(define-c int (internal-ffi-prep-cif internal_ffi_prep_cif) (unsigned-int (pointer void*) (array void*)))
(c-declare
  "void internal_ffi_call(unsigned int nargs, void* rtype, void** atypes, void* fn, void* rvalue, struct sexp_struct* avalues[]) {
    ffi_prep_cif(&cif, FFI_DEFAULT_ABI, nargs, (ffi_type*)rtype, (ffi_type**)atypes);
    void* c_avalues[nargs];
    for(int i = 0; i < nargs; i++) {
      c_avalues[i] = sexp_cpointer_value(avalues[i]);
    }
    ffi_call(&cif, FFI_FN(fn), rvalue, c_avalues);
  }")
(define-c void
          (internal-ffi-call internal_ffi_call)
          (unsigned-int
            (pointer void*)
            (array void*)
            (pointer void*)
            (pointer void*)
            (array sexp)))

(c-declare
  "void* scheme_procedure_to_pointer(sexp proc) {
    if(sexp_procedurep(proc) == 1) {
      return 0;  //&sexp_unbox_fixnum(proc);
    } else {
      printf(\"NOT A FUNCTION\\n\");
    }
    return (void*)proc;
  }")
(define-c void* (scheme-procedure-to-pointer scheme_procedure_to_pointer) (sexp))