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#define UNW_LOCAL_ONLY
#include <libunwind.h>
#include "compiler.h"
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int ok;
int verbose;
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 3)
void a (int, ...) __attribute__((optimize(0)));
void b (void) __attribute__((optimize(0)));
void c (void) __attribute__((optimize(0)));
#endif
void NOINLINE
b (void)
{
void *v[20];
int i, n;
n = unw_backtrace(v, 20);
/* Check that the number of addresses given by unw_backtrace() looks
* reasonable. If the compiler inlined everything, then this check will also
* break. */
if (n >= 7)
ok = 1;
if (verbose)
for (i = 0; i < n; ++i)
printf ("[%d] %p\n", i, v[i]);
}
void NOINLINE
c (void)
{
b ();
}
void NOINLINE
a (int d, ...)
{
switch (d)
{
case 5:
a (4, 2,4);
break;
case 4:
a (3, 1,3,5);
break;
case 3:
a (2, 11, 13, 17, 23);
break;
case 2:
a (1);
break;
case 1:
c ();
}
}
int
main (int argc, char **argv UNUSED)
{
if (argc > 1)
verbose = 1;
a (5, 3, 4, 5, 6);
if (!ok)
{
fprintf (stderr, "FAILURE: expected deeper backtrace.\n");
return 1;
}
if (verbose)
printf ("SUCCESS.\n");
return 0;
}
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