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libunwind-eh_elf/tests/Gperf-simple.c
hp.com!davidm 29f2f89a8f (measure_unwind): Return 0.
(Logical change 1.104)
2003-09-25 05:29:14 +00:00

77 lines
1.3 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <libunwind.h>
#define panic(args...) \
do { fprintf (stderr, args); exit (-1); } while (0)
static inline double
gettime (void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec + 1e-6*tv.tv_usec;
}
static int
measure_unwind (int maxlevel)
{
double stop, mid, start;
unw_cursor_t cursor;
unw_context_t uc;
int ret, level = 0;
start = gettime ();
unw_getcontext (&uc);
if (unw_init_local (&cursor, &uc) < 0)
panic ("unw_init_local() failed\n");
mid = gettime ();
do
{
ret = unw_step (&cursor);
if (ret < 0)
panic ("unw_step() failed\n");
++level;
}
while (ret > 0);
stop = gettime ();
if (level <= maxlevel)
panic ("Unwound only %d levels, expected at least %d levels",
level, maxlevel);
printf ("initialization time = %gnsec, time per unwind-step = %gnsec\n",
1e9*(mid - start), 1e9*(stop - mid)/level);
return 0;
}
static int
f1 (int level, int maxlevel)
{
if (level == maxlevel)
return measure_unwind (maxlevel);
else
/* defeat last-call/sibcall optimization */
return f1 (level + 1, maxlevel) + level;
}
int
main (int argc, char **argv)
{
int i, maxlevel = 100;
if (argc > 1)
maxlevel = atol (argv[1]);
for (i = 0; i < 20; ++i)
f1 (0, maxlevel);
return 0;
}