stack-uar-realign.c
661 Bytes
// RUN: %clang_hwasan -g %s -o %t && not %run %t 2>&1 | FileCheck %s
// Dynamic stack realignment causes debug info locations to use non-FP-relative
// offsets because stack frames are realigned below FP, which means that we
// can't associate addresses with stack objects in this case. Ideally we should
// be able to handle this case somehow (e.g. by using a different register for
// DW_AT_frame_base) but at least we shouldn't get confused by it.
__attribute((noinline))
char *buggy() {
_Alignas(64) char c[64];
char *volatile p = c;
return p;
}
int main() {
char *p = buggy();
// CHECK-NOT: Potentially referenced stack objects:
p[0] = 0;
}