github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libffi/testsuite/libffi.call/cls_uchar.c (about)

     1  /* Area:	closure_call
     2     Purpose:	Check return value uchar.
     3     Limitations:	none.
     4     PR:		none.
     5     Originator:	<andreast@gcc.gnu.org> 20030828	 */
     6  
     7  /* { dg-do run } */
     8  #include "ffitest.h"
     9  
    10  static void cls_ret_uchar_fn(ffi_cif* cif __UNUSED__, void* resp, void** args,
    11  			     void* userdata __UNUSED__)
    12  {
    13    *(ffi_arg*)resp = *(unsigned char *)args[0];
    14    printf("%d: %d\n",*(unsigned char *)args[0],
    15  	 (int)*(ffi_arg *)(resp));
    16  }
    17  typedef unsigned char (*cls_ret_uchar)(unsigned char);
    18  
    19  int main (void)
    20  {
    21    ffi_cif cif;
    22    void *code;
    23    ffi_closure *pcl = ffi_closure_alloc(sizeof(ffi_closure), &code);
    24    ffi_type * cl_arg_types[2];
    25    unsigned char res;
    26  
    27    cl_arg_types[0] = &ffi_type_uchar;
    28    cl_arg_types[1] = NULL;
    29  
    30    /* Initialize the cif */
    31    CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1,
    32  		     &ffi_type_uchar, cl_arg_types) == FFI_OK);
    33  
    34    CHECK(ffi_prep_closure_loc(pcl, &cif, cls_ret_uchar_fn, NULL, code)  == FFI_OK);
    35  
    36    res = (*((cls_ret_uchar)code))(127);
    37    /* { dg-output "127: 127" } */
    38    printf("res: %d\n",res);
    39    /* { dg-output "\nres: 127" } */
    40  
    41    exit(0);
    42  }