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

     1  /* Area:	closure_call
     2     Purpose:	Check return value schar.
     3     Limitations:	none.
     4     PR:		none.
     5     Originator:	<andreast@gcc.gnu.org> 20031108	 */
     6  
     7  
     8  
     9  /* { dg-do run } */
    10  #include "ffitest.h"
    11  
    12  static void cls_ret_schar_fn(ffi_cif* cif __UNUSED__, void* resp, void** args,
    13  			     void* userdata __UNUSED__)
    14  {
    15    *(ffi_arg*)resp = *(signed char *)args[0];
    16    printf("%d: %d\n",*(signed char *)args[0],
    17  	 (int)*(ffi_arg *)(resp));
    18  }
    19  typedef signed char (*cls_ret_schar)(signed char);
    20  
    21  int main (void)
    22  {
    23    ffi_cif cif;
    24    void *code;
    25    ffi_closure *pcl = ffi_closure_alloc(sizeof(ffi_closure), &code);
    26    ffi_type * cl_arg_types[2];
    27    signed char res;
    28  
    29    cl_arg_types[0] = &ffi_type_schar;
    30    cl_arg_types[1] = NULL;
    31  
    32    /* Initialize the cif */
    33    CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1,
    34  		     &ffi_type_schar, cl_arg_types) == FFI_OK);
    35  
    36    CHECK(ffi_prep_closure_loc(pcl, &cif, cls_ret_schar_fn, NULL, code)  == FFI_OK);
    37  
    38    res = (*((cls_ret_schar)code))(127);
    39    /* { dg-output "127: 127" } */
    40    printf("res: %d\n", res);
    41    /* { dg-output "\nres: 127" } */
    42  
    43    exit(0);
    44  }