compiler-rt/test/dfsan/origin_ld_lost.c

   1 // RUN: %clang_dfsan -gmlt -mllvm -dfsan-track-origins=1 %s -o %t && \
   2 // RUN:     %run %t >%t.out 2>&1
   3 // RUN: FileCheck %s < %t.out
   4 //
   5 // Test origin tracking can lost origins at 2-byte load with addr % 4 == 3.
   6
   7 #include <sanitizer/dfsan_interface.h>
   8
   9 __attribute__((noinline)) uint16_t foo(uint16_t a, uint16_t b) { return a + b; }
  10
  11 int main(int argc, char *argv[]) {
  12   uint64_t a __attribute__((aligned(4))) = 1;
  13   uint32_t b = 10;
  14   dfsan_set_label(4, (uint8_t *)&a + 4, sizeof(uint8_t));
  15   uint16_t c = foo(*(uint16_t *)((uint8_t *)&a + 3), b);
  16   dfsan_print_origin_trace(&c, "foo");
  17 }
  18
  19 // CHECK: Taint value 0x4 {{.*}} origin tracking (foo)
  20 // CHECK: Origin value: {{.*}}, Taint value was created at
  21 // CHECK: #0 {{.*}} in main {{.*}}origin_ld_lost.c:[[@LINE-6]]