Ruby  2.7.1p83(2020-03-31revisiona0c7c23c9cec0d0ffcba012279cd652d28ad5bf3)
float1.c
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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 
11 typedef union
12 {
13  double d;
14  unsigned char c[sizeof (double)];
15 } value_type;
16 
17 #define CANARY 0xba
18 
19 static double dblit(float f)
20 {
21  return f/3.0;
22 }
23 
24 int 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 */
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 }
i
uint32_t i
Definition: rb_mjit_min_header-2.7.1.h:5464
DBL_EPSILON
#define DBL_EPSILON
Definition: numeric.c:61
double
double
Definition: rb_mjit_min_header-2.7.1.h:5923
CANARY
#define CANARY
Definition: float1.c:17
value_type
enum ruby_value_type value_type
Definition: debug.c:34
large_tag::c
unsigned c
Definition: cls_struct_va1.c:21
value_type::d
double d
Definition: float1.c:13
main
int main(void)
Definition: float1.c:24
ffitest.h
CHECK
#define CHECK(sub)
Definition: compile.c:448
FFI_DEFAULT_ABI
@ FFI_DEFAULT_ABI
Definition: ffitarget.h:38
f
#define f
memset
void * memset(void *, int, size_t)
large_tag::d
unsigned d
Definition: cls_struct_va1.c:22
ffi_prep_cif
ffi_status ffi_prep_cif(ffi_cif *cif, ffi_abi abi, unsigned int nargs, ffi_type *rtype, ffi_type **atypes)
Definition: prep_cif.c:226
MAX_ARGS
#define MAX_ARGS
Definition: function.c:15
exit
void exit(int __status) __attribute__((__noreturn__))
ffi_call
void ffi_call(ffi_cif *cif, void(*fn)(void), void *rvalue, void **avalue)
Definition: ffi.c:813
value_type
Definition: float1.c:11