github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libffi/testsuite/libffi.call/nested_struct10.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    unsigned char y;
    19    struct A x;
    20    unsigned int z;
    21  } B;
    22  
    23  typedef struct C {
    24    unsigned long long d;
    25    unsigned char e;
    26  } C;
    27  
    28  static B B_fn(struct A b2, struct B b3, struct C b4)
    29  {
    30    struct B result;
    31  
    32    result.x.a = b2.a + b3.x.a + b3.z + b4.d;
    33    result.x.b = b2.b + b3.x.b + b3.y + b4.e;
    34    result.y = b2.b + b3.x.b + b4.e;
    35  
    36    printf("%d %d %d %d %d %d %d %d: %d %d %d\n", (int)b2.a, b2.b,
    37  	 (int)b3.x.a, b3.x.b, b3.y, b3.z, (int)b4.d, b4.e,
    38  	 (int)result.x.a, result.x.b, result.y);
    39  
    40    return result;
    41  }
    42  
    43  static void
    44  B_gn(ffi_cif* cif __UNUSED__, void* resp, void** args,
    45       void* userdata __UNUSED__)
    46  {
    47    struct A b0;
    48    struct B b1;
    49    struct C b2;
    50  
    51    b0 = *(struct A*)(args[0]);
    52    b1 = *(struct B*)(args[1]);
    53    b2 = *(struct C*)(args[2]);
    54  
    55    *(B*)resp = B_fn(b0, b1, b2);
    56  }
    57  
    58  int main (void)
    59  {
    60    ffi_cif cif;
    61    void *code;
    62    ffi_closure *pcl = ffi_closure_alloc(sizeof(ffi_closure), &code);
    63    void* args_dbl[4];
    64    ffi_type* cls_struct_fields[3];
    65    ffi_type* cls_struct_fields1[4];
    66    ffi_type* cls_struct_fields2[3];
    67    ffi_type cls_struct_type, cls_struct_type1, cls_struct_type2;
    68    ffi_type* dbl_arg_types[4];
    69  
    70    struct A e_dbl = { 1LL, 7};
    71    struct B f_dbl = { 99, {12LL , 127}, 255};
    72    struct C g_dbl = { 2LL, 9};
    73  
    74    struct B res_dbl;
    75  
    76    cls_struct_type.size = 0;
    77    cls_struct_type.alignment = 0;
    78    cls_struct_type.type = FFI_TYPE_STRUCT;
    79    cls_struct_type.elements = cls_struct_fields;
    80  
    81    cls_struct_type1.size = 0;
    82    cls_struct_type1.alignment = 0;
    83    cls_struct_type1.type = FFI_TYPE_STRUCT;
    84    cls_struct_type1.elements = cls_struct_fields1;
    85  
    86    cls_struct_type2.size = 0;
    87    cls_struct_type2.alignment = 0;
    88    cls_struct_type2.type = FFI_TYPE_STRUCT;
    89    cls_struct_type2.elements = cls_struct_fields2;
    90  
    91    cls_struct_fields[0] = &ffi_type_uint64;
    92    cls_struct_fields[1] = &ffi_type_uchar;
    93    cls_struct_fields[2] = NULL;
    94  
    95    cls_struct_fields1[0] = &ffi_type_uchar;
    96    cls_struct_fields1[1] = &cls_struct_type;
    97    cls_struct_fields1[2] = &ffi_type_uint;
    98    cls_struct_fields1[3] = NULL;
    99  
   100    cls_struct_fields2[0] = &ffi_type_uint64;
   101    cls_struct_fields2[1] = &ffi_type_uchar;
   102    cls_struct_fields2[2] = NULL;
   103  
   104  
   105    dbl_arg_types[0] = &cls_struct_type;
   106    dbl_arg_types[1] = &cls_struct_type1;
   107    dbl_arg_types[2] = &cls_struct_type2;
   108    dbl_arg_types[3] = NULL;
   109  
   110    CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 3, &cls_struct_type1,
   111  		     dbl_arg_types) == FFI_OK);
   112  
   113    args_dbl[0] = &e_dbl;
   114    args_dbl[1] = &f_dbl;
   115    args_dbl[2] = &g_dbl;
   116    args_dbl[3] = NULL;
   117  
   118    ffi_call(&cif, FFI_FN(B_fn), &res_dbl, args_dbl);
   119    /* { dg-output "1 7 12 127 99 255 2 9: 270 242 143" } */
   120    CHECK( res_dbl.x.a == (e_dbl.a + f_dbl.x.a + f_dbl.z + g_dbl.d));
   121    CHECK( res_dbl.x.b == (e_dbl.b + f_dbl.x.b + f_dbl.y + g_dbl.e));
   122    CHECK( res_dbl.y == (e_dbl.b + f_dbl.x.b + g_dbl.e));
   123  
   124    CHECK(ffi_prep_closure_loc(pcl, &cif, B_gn, NULL, code) == FFI_OK);
   125  
   126    res_dbl = ((B(*)(A, B, C))(code))(e_dbl, f_dbl, g_dbl);
   127    /* { dg-output "\n1 7 12 127 99 255 2 9: 270 242 143" } */
   128    CHECK( res_dbl.x.a == (e_dbl.a + f_dbl.x.a + f_dbl.z + g_dbl.d));
   129    CHECK( res_dbl.x.b == (e_dbl.b + f_dbl.x.b + f_dbl.y + g_dbl.e));
   130    CHECK( res_dbl.y == (e_dbl.b + f_dbl.x.b + g_dbl.e));
   131  
   132    exit(0);
   133  }