github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libffi/testsuite/libffi.call/cls_4_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  /* { dg-do run } */
    10  #include "ffitest.h"
    11  
    12  typedef struct cls_struct_4_1byte {
    13    unsigned char a;
    14    unsigned char b;
    15    unsigned char c;
    16    unsigned char d;
    17  } cls_struct_4_1byte;
    18  
    19  cls_struct_4_1byte cls_struct_4_1byte_fn(struct cls_struct_4_1byte a1,
    20  			    struct cls_struct_4_1byte a2)
    21  {
    22    struct cls_struct_4_1byte result;
    23  
    24    result.a = a1.a + a2.a;
    25    result.b = a1.b + a2.b;
    26    result.c = a1.c + a2.c;
    27    result.d = a1.d + a2.d;
    28  
    29    printf("%d %d %d %d %d %d %d %d: %d %d %d %d\n", a1.a, a1.b, a1.c, a1.d,
    30  	 a2.a, a2.b, a2.c, a2.d,
    31  	 result.a, result.b, result.c, result.d);
    32  
    33    return  result;
    34  }
    35  
    36  static void
    37  cls_struct_4_1byte_gn(ffi_cif* cif __UNUSED__, void* resp, void** args,
    38  		      void* userdata __UNUSED__)
    39  {
    40  
    41    struct cls_struct_4_1byte a1, a2;
    42  
    43    a1 = *(struct cls_struct_4_1byte*)(args[0]);
    44    a2 = *(struct cls_struct_4_1byte*)(args[1]);
    45  
    46    *(cls_struct_4_1byte*)resp = cls_struct_4_1byte_fn(a1, a2);
    47  }
    48  
    49  int main (void)
    50  {
    51    ffi_cif cif;
    52    void *code;
    53    ffi_closure *pcl = ffi_closure_alloc(sizeof(ffi_closure), &code);
    54    void* args_dbl[5];
    55    ffi_type* cls_struct_fields[5];
    56    ffi_type cls_struct_type;
    57    ffi_type* dbl_arg_types[5];
    58  
    59    struct cls_struct_4_1byte g_dbl = { 12, 13, 14, 15 };
    60    struct cls_struct_4_1byte f_dbl = { 178, 179, 180, 181 };
    61    struct cls_struct_4_1byte res_dbl;
    62  
    63    cls_struct_type.size = 0;
    64    cls_struct_type.alignment = 0;
    65    cls_struct_type.type = FFI_TYPE_STRUCT;
    66    cls_struct_type.elements = cls_struct_fields;
    67  
    68    cls_struct_fields[0] = &ffi_type_uchar;
    69    cls_struct_fields[1] = &ffi_type_uchar;
    70    cls_struct_fields[2] = &ffi_type_uchar;
    71    cls_struct_fields[3] = &ffi_type_uchar;
    72    cls_struct_fields[4] = NULL;
    73  
    74    dbl_arg_types[0] = &cls_struct_type;
    75    dbl_arg_types[1] = &cls_struct_type;
    76    dbl_arg_types[2] = NULL;
    77  
    78    CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 2, &cls_struct_type,
    79  		     dbl_arg_types) == FFI_OK);
    80  
    81    args_dbl[0] = &g_dbl;
    82    args_dbl[1] = &f_dbl;
    83    args_dbl[2] = NULL;
    84  
    85    ffi_call(&cif, FFI_FN(cls_struct_4_1byte_fn), &res_dbl, args_dbl);
    86    /* { dg-output "12 13 14 15 178 179 180 181: 190 192 194 196" } */
    87    printf("res: %d %d %d %d\n", res_dbl.a, res_dbl.b, res_dbl.c, res_dbl.d);
    88    /* { dg-output "\nres: 190 192 194 196" } */
    89  
    90    CHECK(ffi_prep_closure_loc(pcl, &cif, cls_struct_4_1byte_gn, NULL, code) == FFI_OK);
    91  
    92    res_dbl = ((cls_struct_4_1byte(*)(cls_struct_4_1byte, cls_struct_4_1byte))(code))(g_dbl, f_dbl);
    93    /* { dg-output "\n12 13 14 15 178 179 180 181: 190 192 194 196" } */
    94    printf("res: %d %d %d %d\n", res_dbl.a, res_dbl.b, res_dbl.c, res_dbl.d);
    95    /* { dg-output "\nres: 190 192 194 196" } */
    96  
    97    exit(0);
    98  }