github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libffi/testsuite/libffi.call/nested_struct7.c (about)

     1  /* Area:	ffi_call, closure_call
     2     Purpose:	Check structure passing with different structure size.
     3  		Contains structs as parameter of the struct itself.
     4  		Sample taken from Alan Modras patch to src/prep_cif.c.
     5     Limitations:	none.
     6     PR:		none.
     7     Originator:	<andreast@gcc.gnu.org> 20051010	 */
     8  
     9  /* { dg-do run } */
    10  #include "ffitest.h"
    11  
    12  typedef struct A {
    13    unsigned long long a;
    14    unsigned char b;
    15  } A;
    16  
    17  typedef struct B {
    18    struct A x;
    19    unsigned char y;
    20  } B;
    21  
    22  static B B_fn(struct A b2, struct B b3)
    23  {
    24    struct B result;
    25  
    26    result.x.a = b2.a + b3.x.a;
    27    result.x.b = b2.b + b3.x.b + b3.y;
    28    result.y = b2.b + b3.x.b;
    29  
    30    printf("%d %d %d %d %d: %d %d %d\n", (int)b2.a, b2.b,
    31  	 (int)b3.x.a, b3.x.b, b3.y,
    32  	 (int)result.x.a, result.x.b, result.y);
    33  
    34    return result;
    35  }
    36  
    37  static void
    38  B_gn(ffi_cif* cif __UNUSED__, void* resp, void** args,
    39       void* userdata __UNUSED__)
    40  {
    41    struct A b0;
    42    struct B b1;
    43  
    44    b0 = *(struct A*)(args[0]);
    45    b1 = *(struct B*)(args[1]);
    46  
    47    *(B*)resp = B_fn(b0, b1);
    48  }
    49  
    50  int main (void)
    51  {
    52    ffi_cif cif;
    53    void *code;
    54    ffi_closure *pcl = ffi_closure_alloc(sizeof(ffi_closure), &code);
    55    void* args_dbl[3];
    56    ffi_type* cls_struct_fields[3];
    57    ffi_type* cls_struct_fields1[3];
    58    ffi_type cls_struct_type, cls_struct_type1;
    59    ffi_type* dbl_arg_types[3];
    60  
    61    struct A e_dbl = { 1LL, 7};
    62    struct B f_dbl = {{12.0 , 127}, 99};
    63  
    64    struct B res_dbl;
    65  
    66    cls_struct_type.size = 0;
    67    cls_struct_type.alignment = 0;
    68    cls_struct_type.type = FFI_TYPE_STRUCT;
    69    cls_struct_type.elements = cls_struct_fields;
    70  
    71    cls_struct_type1.size = 0;
    72    cls_struct_type1.alignment = 0;
    73    cls_struct_type1.type = FFI_TYPE_STRUCT;
    74    cls_struct_type1.elements = cls_struct_fields1;
    75  
    76    cls_struct_fields[0] = &ffi_type_uint64;
    77    cls_struct_fields[1] = &ffi_type_uchar;
    78    cls_struct_fields[2] = NULL;
    79  
    80    cls_struct_fields1[0] = &cls_struct_type;
    81    cls_struct_fields1[1] = &ffi_type_uchar;
    82    cls_struct_fields1[2] = NULL;
    83  
    84  
    85    dbl_arg_types[0] = &cls_struct_type;
    86    dbl_arg_types[1] = &cls_struct_type1;
    87    dbl_arg_types[2] = NULL;
    88  
    89    CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 2, &cls_struct_type1,
    90  		     dbl_arg_types) == FFI_OK);
    91  
    92    args_dbl[0] = &e_dbl;
    93    args_dbl[1] = &f_dbl;
    94    args_dbl[2] = NULL;
    95  
    96    ffi_call(&cif, FFI_FN(B_fn), &res_dbl, args_dbl);
    97    /* { dg-output "1 7 12 127 99: 13 233 134" } */
    98    CHECK( res_dbl.x.a == (e_dbl.a + f_dbl.x.a));
    99    CHECK( res_dbl.x.b == (e_dbl.b + f_dbl.x.b + f_dbl.y));
   100    CHECK( res_dbl.y == (e_dbl.b + f_dbl.x.b));
   101  
   102    CHECK(ffi_prep_closure_loc(pcl, &cif, B_gn, NULL, code) == FFI_OK);
   103  
   104    res_dbl = ((B(*)(A, B))(code))(e_dbl, f_dbl);
   105    /* { dg-output "\n1 7 12 127 99: 13 233 134" } */
   106    CHECK( res_dbl.x.a == (e_dbl.a + f_dbl.x.a));
   107    CHECK( res_dbl.x.b == (e_dbl.b + f_dbl.x.b + f_dbl.y));
   108    CHECK( res_dbl.y == (e_dbl.b + f_dbl.x.b));
   109  
   110    exit(0);
   111  }