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preload: use unw_backtrace()

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This seems to be significantly faster than doing the manual stepping. A
quick look shows that it has a number of special cases which we'd have
to duplicate, so best to just use it directly.
This commit is contained in:
Christian Hergert
2020-02-17 12:05:32 -08:00
parent ebeba62669
commit a37ad780ca
1 changed files with 9 additions and 23 deletions
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32
src/libsysprof/preload/sysprof-memory-collector.c
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@ -76,29 +76,15 @@ backtrace_func (SysprofCaptureAddress *addrs,
gpointer user_data)
{
#if defined(ENABLE_LIBUNWIND)
unw_context_t uc;
unw_cursor_t cursor;
unw_word_t ip;
unw_getcontext (&uc);
unw_init_local (&cursor, &uc);
/* Skip past caller frames */
if (unw_step (&cursor) > 0 && unw_step (&cursor) > 0)
{
guint n = 0;
/* Now walk the stack frames back */
while (n < n_addrs && unw_step (&cursor) > 0)
{
unw_get_reg (&cursor, UNW_REG_IP, &ip);
addrs[n++] = ip;
}
return n;
}
return 0;
# if GLIB_SIZEOF_VOID_P == 8
return unw_backtrace ((void **)addrs, n_addrs);
# else
void **stack = alloca (n_addrs * sizeof (gpointer));
guint n = unw_backtrace (stack, n_addrs);
for (guint i = 0; i < n; i++)
addrs[i] = GPOINTER_TO_SIZE (stack[i]);
return n;
# endif
#elif defined(HAVE_EXECINFO_H)
# if GLIB_SIZEOF_VOID_P == 8
return backtrace ((void **)addrs, n_addrs);