/js/src/ctypes/libffi/testsuite/libffi.call/float1.c

 1/* Area:	ffi_call
 2   Purpose:	Check return value double.
 3   Limitations:	none.
 4   PR:		none.
 5   Originator:	From the original ffitest.c  */
 6
 7/* { dg-do run } */
 8#include "ffitest.h"
 9#include "float.h"
10
11typedef union
12{
13  double d;
14  unsigned char c[sizeof (double)];
15} value_type;
16
17#define CANARY 0xba
18
19static double dblit(float f)
20{
21  return f/3.0;
22}
23
24int main (void)
25{
26  ffi_cif cif;
27  ffi_type *args[MAX_ARGS];
28  void *values[MAX_ARGS];
29  float f;
30  value_type result[2];
31  unsigned int i;
32
33  args[0] = &ffi_type_float;
34  values[0] = &f;
35
36  /* Initialize the cif */
37  CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1,
38		     &ffi_type_double, args) == FFI_OK);
39
40  f = 3.14159;
41
42  /* Put a canary in the return array.  This is a regression test for
43     a buffer overrun.  */
44  memset(result[1].c, CANARY, sizeof (double));
45
46  ffi_call(&cif, FFI_FN(dblit), &result[0].d, values);
47
48  /* These are not always the same!! Check for a reasonable delta */
49
50  CHECK(result[0].d - dblit(f) < DBL_EPSILON);
51
52  /* Check the canary.  */
53  for (i = 0; i < sizeof (double); ++i)
54    CHECK(result[1].c[i] == CANARY);
55
56  exit(0);
57
58}