github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libffi/testsuite/libffi.call/problem1.c (about)

     1  /* Area:	ffi_call, closure_call
     2     Purpose:	Check structure passing with different structure size.
     3     Limitations:	none.
     4     PR:		none.
     5     Originator:	<andreast@gcc.gnu.org> 20030828	 */
     6  
     7  /* { dg-do run } */
     8  #include "ffitest.h"
     9  
    10  typedef struct my_ffi_struct {
    11    double a;
    12    double b;
    13    double c;
    14  } my_ffi_struct;
    15  
    16  my_ffi_struct callee(struct my_ffi_struct a1, struct my_ffi_struct a2)
    17  {
    18    struct my_ffi_struct result;
    19    result.a = a1.a + a2.a;
    20    result.b = a1.b + a2.b;
    21    result.c = a1.c + a2.c;
    22  
    23  
    24    printf("%g %g %g %g %g %g: %g %g %g\n", a1.a, a1.b, a1.c,
    25  	 a2.a, a2.b, a2.c, result.a, result.b, result.c);
    26  
    27    return result;
    28  }
    29  
    30  void stub(ffi_cif* cif __UNUSED__, void* resp, void** args,
    31  	  void* userdata __UNUSED__)
    32  {
    33    struct my_ffi_struct a1;
    34    struct my_ffi_struct a2;
    35  
    36    a1 = *(struct my_ffi_struct*)(args[0]);
    37    a2 = *(struct my_ffi_struct*)(args[1]);
    38  
    39    *(my_ffi_struct *)resp = callee(a1, a2);
    40  }
    41  
    42  
    43  int main(void)
    44  {
    45    ffi_type* my_ffi_struct_fields[4];
    46    ffi_type my_ffi_struct_type;
    47    ffi_cif cif;
    48    void *code;
    49    ffi_closure *pcl = ffi_closure_alloc(sizeof(ffi_closure), &code);
    50    void* args[4];
    51    ffi_type* arg_types[3];
    52  
    53    struct my_ffi_struct g = { 1.0, 2.0, 3.0 };
    54    struct my_ffi_struct f = { 1.0, 2.0, 3.0 };
    55    struct my_ffi_struct res;
    56  
    57    my_ffi_struct_type.size = 0;
    58    my_ffi_struct_type.alignment = 0;
    59    my_ffi_struct_type.type = FFI_TYPE_STRUCT;
    60    my_ffi_struct_type.elements = my_ffi_struct_fields;
    61  
    62    my_ffi_struct_fields[0] = &ffi_type_double;
    63    my_ffi_struct_fields[1] = &ffi_type_double;
    64    my_ffi_struct_fields[2] = &ffi_type_double;
    65    my_ffi_struct_fields[3] = NULL;
    66  
    67    arg_types[0] = &my_ffi_struct_type;
    68    arg_types[1] = &my_ffi_struct_type;
    69    arg_types[2] = NULL;
    70  
    71    CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 2, &my_ffi_struct_type,
    72  		     arg_types) == FFI_OK);
    73  
    74    args[0] = &g;
    75    args[1] = &f;
    76    args[2] = NULL;
    77    ffi_call(&cif, FFI_FN(callee), &res, args);
    78    /* { dg-output "1 2 3 1 2 3: 2 4 6" } */
    79    printf("res: %g %g %g\n", res.a, res.b, res.c);
    80    /* { dg-output "\nres: 2 4 6" } */
    81  
    82    CHECK(ffi_prep_closure_loc(pcl, &cif, stub, NULL, code) == FFI_OK);
    83  
    84    res = ((my_ffi_struct(*)(struct my_ffi_struct, struct my_ffi_struct))(code))(g, f);
    85    /* { dg-output "\n1 2 3 1 2 3: 2 4 6" } */
    86    printf("res: %g %g %g\n", res.a, res.b, res.c);
    87    /* { dg-output "\nres: 2 4 6" } */
    88  
    89    exit(0);;
    90  }