github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libffi/testsuite/libffi.call/cls_1_1byte.c (about)

     1  /* Area:	ffi_call, closure_call
     2     Purpose:	Check structure passing with different structure size.
     3  		Especially with small structures which may fit in one
     4  		register. Depending on the ABI.
     5     Limitations:	none.
     6     PR:		none.
     7     Originator:	<andreast@gcc.gnu.org> 20030902	 */
     8  
     9  
    10  
    11  /* { dg-do run } */
    12  #include "ffitest.h"
    13  
    14  typedef struct cls_struct_1_1byte {
    15    unsigned char a;
    16  } cls_struct_1_1byte;
    17  
    18  cls_struct_1_1byte cls_struct_1_1byte_fn(struct cls_struct_1_1byte a1,
    19  			    struct cls_struct_1_1byte a2)
    20  {
    21    struct cls_struct_1_1byte result;
    22  
    23    result.a = a1.a + a2.a;
    24  
    25    printf("%d %d: %d\n", a1.a, a2.a, result.a);
    26  
    27    return  result;
    28  }
    29  
    30  static void
    31  cls_struct_1_1byte_gn(ffi_cif* cif __UNUSED__, void* resp, void** args,
    32  		      void* userdata __UNUSED__)
    33  {
    34  
    35    struct cls_struct_1_1byte a1, a2;
    36  
    37    a1 = *(struct cls_struct_1_1byte*)(args[0]);
    38    a2 = *(struct cls_struct_1_1byte*)(args[1]);
    39  
    40    *(cls_struct_1_1byte*)resp = cls_struct_1_1byte_fn(a1, a2);
    41  }
    42  
    43  int main (void)
    44  {
    45    ffi_cif cif;
    46    void *code;
    47    ffi_closure *pcl = ffi_closure_alloc(sizeof(ffi_closure), &code);
    48    void* args_dbl[5];
    49    ffi_type* cls_struct_fields[2];
    50    ffi_type cls_struct_type;
    51    ffi_type* dbl_arg_types[5];
    52  
    53    struct cls_struct_1_1byte g_dbl = { 12 };
    54    struct cls_struct_1_1byte f_dbl = { 178 };
    55    struct cls_struct_1_1byte res_dbl;
    56  
    57    cls_struct_type.size = 0;
    58    cls_struct_type.alignment = 0;
    59    cls_struct_type.type = FFI_TYPE_STRUCT;
    60    cls_struct_type.elements = cls_struct_fields;
    61  
    62    cls_struct_fields[0] = &ffi_type_uchar;
    63    cls_struct_fields[1] = NULL;
    64  
    65    dbl_arg_types[0] = &cls_struct_type;
    66    dbl_arg_types[1] = &cls_struct_type;
    67    dbl_arg_types[2] = NULL;
    68  
    69    CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 2, &cls_struct_type,
    70  		     dbl_arg_types) == FFI_OK);
    71  
    72    args_dbl[0] = &g_dbl;
    73    args_dbl[1] = &f_dbl;
    74    args_dbl[2] = NULL;
    75  
    76    ffi_call(&cif, FFI_FN(cls_struct_1_1byte_fn), &res_dbl, args_dbl);
    77    /* { dg-output "12 178: 190" } */
    78    printf("res: %d\n", res_dbl.a);
    79    /* { dg-output "\nres: 190" } */
    80  
    81    CHECK(ffi_prep_closure_loc(pcl, &cif, cls_struct_1_1byte_gn, NULL, code) == FFI_OK);
    82  
    83    res_dbl = ((cls_struct_1_1byte(*)(cls_struct_1_1byte, cls_struct_1_1byte))(code))(g_dbl, f_dbl);
    84    /* { dg-output "\n12 178: 190" } */
    85    printf("res: %d\n", res_dbl.a);
    86    /* { dg-output "\nres: 190" } */
    87  
    88    exit(0);
    89  }