github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libffi/testsuite/libffi.call/nested_struct8.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  typedef struct C {
    23    unsigned long long d;
    24    unsigned char e;
    25  } C;
    26  
    27  static B B_fn(struct A b2, struct B b3, struct C b4)
    28  {
    29    struct B result;
    30  
    31    result.x.a = b2.a + b3.x.a + b4.d;
    32    result.x.b = b2.b + b3.x.b + b3.y + b4.e;
    33    result.y = b2.b + b3.x.b + b4.e;
    34  
    35    printf("%d %d %d %d %d %d %d: %d %d %d\n", (int)b2.a, b2.b,
    36  	 (int)b3.x.a, b3.x.b, b3.y, (int)b4.d, b4.e,
    37  	 (int)result.x.a, result.x.b, result.y);
    38  
    39    return result;
    40  }
    41  
    42  static void
    43  B_gn(ffi_cif* cif __UNUSED__, void* resp, void** args,
    44       void* userdata __UNUSED__)
    45  {
    46    struct A b0;
    47    struct B b1;
    48    struct C b2;
    49  
    50    b0 = *(struct A*)(args[0]);
    51    b1 = *(struct B*)(args[1]);
    52    b2 = *(struct C*)(args[2]);
    53  
    54    *(B*)resp = B_fn(b0, b1, b2);
    55  }
    56  
    57  int main (void)
    58  {
    59    ffi_cif cif;
    60    void *code;
    61    ffi_closure *pcl = ffi_closure_alloc(sizeof(ffi_closure), &code);
    62    void* args_dbl[4];
    63    ffi_type* cls_struct_fields[3];
    64    ffi_type* cls_struct_fields1[3];
    65    ffi_type* cls_struct_fields2[3];
    66    ffi_type cls_struct_type, cls_struct_type1, cls_struct_type2;
    67    ffi_type* dbl_arg_types[4];
    68  
    69    struct A e_dbl = { 1LL, 7};
    70    struct B f_dbl = {{12LL , 127}, 99};
    71    struct C g_dbl = { 2LL, 9};
    72  
    73    struct B res_dbl;
    74  
    75    cls_struct_type.size = 0;
    76    cls_struct_type.alignment = 0;
    77    cls_struct_type.type = FFI_TYPE_STRUCT;
    78    cls_struct_type.elements = cls_struct_fields;
    79  
    80    cls_struct_type1.size = 0;
    81    cls_struct_type1.alignment = 0;
    82    cls_struct_type1.type = FFI_TYPE_STRUCT;
    83    cls_struct_type1.elements = cls_struct_fields1;
    84  
    85    cls_struct_type2.size = 0;
    86    cls_struct_type2.alignment = 0;
    87    cls_struct_type2.type = FFI_TYPE_STRUCT;
    88    cls_struct_type2.elements = cls_struct_fields2;
    89  
    90    cls_struct_fields[0] = &ffi_type_uint64;
    91    cls_struct_fields[1] = &ffi_type_uchar;
    92    cls_struct_fields[2] = NULL;
    93  
    94    cls_struct_fields1[0] = &cls_struct_type;
    95    cls_struct_fields1[1] = &ffi_type_uchar;
    96    cls_struct_fields1[2] = NULL;
    97  
    98    cls_struct_fields2[0] = &ffi_type_uint64;
    99    cls_struct_fields2[1] = &ffi_type_uchar;
   100    cls_struct_fields2[2] = NULL;
   101  
   102  
   103    dbl_arg_types[0] = &cls_struct_type;
   104    dbl_arg_types[1] = &cls_struct_type1;
   105    dbl_arg_types[2] = &cls_struct_type2;
   106    dbl_arg_types[3] = NULL;
   107  
   108    CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 3, &cls_struct_type1,
   109  		     dbl_arg_types) == FFI_OK);
   110  
   111    args_dbl[0] = &e_dbl;
   112    args_dbl[1] = &f_dbl;
   113    args_dbl[2] = &g_dbl;
   114    args_dbl[3] = NULL;
   115  
   116    ffi_call(&cif, FFI_FN(B_fn), &res_dbl, args_dbl);
   117    /* { dg-output "1 7 12 127 99 2 9: 15 242 143" } */
   118    CHECK( res_dbl.x.a == (e_dbl.a + f_dbl.x.a + g_dbl.d));
   119    CHECK( res_dbl.x.b == (e_dbl.b + f_dbl.x.b + f_dbl.y + g_dbl.e));
   120    CHECK( res_dbl.y == (e_dbl.b + f_dbl.x.b + g_dbl.e));
   121  
   122    CHECK(ffi_prep_closure_loc(pcl, &cif, B_gn, NULL, code) == FFI_OK);
   123  
   124    res_dbl = ((B(*)(A, B, C))(code))(e_dbl, f_dbl, g_dbl);
   125    /* { dg-output "\n1 7 12 127 99 2 9: 15 242 143" } */
   126    CHECK( res_dbl.x.a == (e_dbl.a + f_dbl.x.a + g_dbl.d));
   127    CHECK( res_dbl.x.b == (e_dbl.b + f_dbl.x.b + f_dbl.y + g_dbl.e));
   128    CHECK( res_dbl.y == (e_dbl.b + f_dbl.x.b + g_dbl.e));
   129  
   130    exit(0);
   131  }