1
2#include <stdio.h>
3#include "valgrind.h"
4
5/* Check that it's safe to call a wrapped function from some other
6   function's wrapper.  Note that because the wrapper for fact1
7   actually interferes with the computation of the result, this
8   program produces a different answer when run on V (162) from
9   natively (120).
10*/
11
12static int fact1 ( int n );
13static int fact2 ( int n );
14
15/* This is needed to stop gcc4 turning 'fact' into a loop */
16__attribute__((noinline))
17int mul ( int x, int y ) { return x * y; }
18
19int fact1 ( int n )
20{
21   if (n == 0) return 1; else return mul(n, fact2(n-1));
22}
23int fact2 ( int n )
24{
25   if (n == 0) return 1; else return mul(n, fact1(n-1));
26}
27
28
29int I_WRAP_SONAME_FNNAME_ZU(NONE,fact1) ( int n )
30{
31   int    r;
32   OrigFn fn;
33   VALGRIND_GET_ORIG_FN(fn);
34   printf("in wrapper1-pre:  fact(%d)\n", n);
35   CALL_FN_W_W(r, fn, n);
36   printf("in wrapper1-post: fact(%d) = %d\n", n, r);
37   if (n >= 3) r += fact2(2);
38   return r;
39}
40
41int I_WRAP_SONAME_FNNAME_ZU(NONE,fact2) ( int n )
42{
43   int    r;
44   OrigFn fn;
45   VALGRIND_GET_ORIG_FN(fn);
46   printf("in wrapper2-pre:  fact(%d)\n", n);
47   CALL_FN_W_W(r, fn, n);
48   printf("in wrapper2-post: fact(%d) = %d\n", n, r);
49   return r;
50}
51
52/* --------------- */
53
54int main ( void )
55{
56   int r;
57   printf("computing fact1(5)\n");
58   r = fact1(5);
59   printf("fact1(5) = %d\n", r);
60   return 0;
61}
62