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 __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 }