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preload: add static assertion with offsetof() check

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This commit is contained in:
Christian Hergert
2024-09-12 09:26:13 -07:00
parent c228634fcb
commit eca993b42c
1 changed files with 3 additions and 1 deletions
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4
src/preload/backtrace-helper.h
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@ -38,12 +38,14 @@ backtrace_func (SysprofCaptureAddress *addrs,
G_GNUC_UNUSED gpointer user_data) G_GNUC_UNUSED gpointer user_data)
{ {
#if GLIB_SIZEOF_VOID_P == 8 #if GLIB_SIZEOF_VOID_P == 8
SYSPROF_STATIC_ASSERT (offsetof (SysprofCaptureAllocation, addrs) >= GLIB_SIZEOF_VOID_P * 2,
"Require space for 2 discarded instruction pointers");
/* We know that collector will overwrite fields *AFTER* it /* We know that collector will overwrite fields *AFTER* it
* has called the backtrace function allowing us to cheat * has called the backtrace function allowing us to cheat
* and subtract an offset from addrs to avoid having to * and subtract an offset from addrs to avoid having to
* copy frame pointers around. * copy frame pointers around.
*/ */
return unw_backtrace ((void **)addrs - 2, n_addrs) - 2; return unw_backtrace (((void **)addrs) - 2, n_addrs) - 2;
#else #else
static const int skip = 2; static const int skip = 2;
void **stack = alloca (n_addrs * sizeof (gpointer)); void **stack = alloca (n_addrs * sizeof (gpointer));