libffi/testsuite/libffi.call/problem1.c

   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, void* resp, void** args, void* userdata)
  31 {
  32     struct my_ffi_struct a1;
  33     struct my_ffi_struct a2;
  34
  35     a1 = *(struct my_ffi_struct*)(args[0]);
  36     a2 = *(struct my_ffi_struct*)(args[1]);
  37
  38     *(my_ffi_struct *)resp = callee(a1, a2);
  39 }
  40
  41
  42 int main(void)
  43 {
  44     ffi_type* my_ffi_struct_fields[4];
  45     ffi_type my_ffi_struct_type;
  46     ffi_cif cif;
  47     static ffi_closure cl;
  48     ffi_closure *pcl = &cl;
  49     void* args[4];
  50     ffi_type* arg_types[3];
  51
  52     struct my_ffi_struct g = { 1.0, 2.0, 3.0 };
  53     struct my_ffi_struct f = { 1.0, 2.0, 3.0 };
  54     struct my_ffi_struct res;
  55
  56     my_ffi_struct_type.size = 0;
  57     my_ffi_struct_type.alignment = 0;
  58     my_ffi_struct_type.type = FFI_TYPE_STRUCT;
  59     my_ffi_struct_type.elements = my_ffi_struct_fields;
  60
  61     my_ffi_struct_fields[0] = &ffi_type_double;
  62     my_ffi_struct_fields[1] = &ffi_type_double;
  63     my_ffi_struct_fields[2] = &ffi_type_double;
  64     my_ffi_struct_fields[3] = NULL;
  65
  66     arg_types[0] = &my_ffi_struct_type;
  67     arg_types[1] = &my_ffi_struct_type;
  68     arg_types[2] = NULL;
  69
  70     CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 2, &my_ffi_struct_type,
  71                        arg_types) == FFI_OK);
  72
  73     args[0] = &g;
  74     args[1] = &f;
  75     args[2] = NULL;
  76     ffi_call(&cif, FFI_FN(callee), &res, args);
  77     /* { dg-output "1 2 3 1 2 3: 2 4 6" } */
  78
  79     CHECK(res.a == 2.0);
  80     CHECK(res.b == 4.0);
  81     CHECK(res.c == 6.0);
  82
  83     CHECK(ffi_prep_closure(pcl, &cif, stub, NULL) == FFI_OK);
  84
  85     res = ((my_ffi_struct(*)(struct my_ffi_struct, struct my_ffi_struct))(pcl))(g, f);
  86     /* { dg-output "\n1 2 3 1 2 3: 2 4 6" } */
  87
  88     CHECK(res.a == 2.0);
  89     CHECK(res.b == 4.0);
  90     CHECK(res.c == 6.0);
  91
  92     exit(0);;
  93 }