compiler-rt/test/msan/chained_origin_empty_stack.cpp

   1 // RUN: %clangxx_msan -fno-sanitize-memory-param-retval -fsanitize-memory-track-origins=2 -O3 %s -o %t && \
   2 // RUN:     MSAN_OPTIONS=store_context_size=1 not %run %t 2>&1 | FileCheck %s
   3
   4 // Test that stack trace for the intermediate store is not empty.
   5
   6 // CHECK: MemorySanitizer: use-of-uninitialized-value
   7 // CHECK:   #0 {{.*}} in main
   8
   9 // CHECK: Uninitialized value was stored to memory at
  10 // CHECK:   #0 {{.*}} in fn_g
  11 // CHECK-NOT: #1
  12
  13 // CHECK: Uninitialized value was created by an allocation of 'z' in the stack frame
  14 // CHECK:   #0 {{.*}} in main
  15
  16 #include <stdio.h>
  17
  18 volatile int x;
  19
  20 __attribute__((noinline))
  21 void fn_g(int a) {
  22   x = a;
  23 }
  24
  25 __attribute__((noinline))
  26 void fn_f(int a) {
  27   fn_g(a);
  28 }
  29
  30 int main(int argc, char *argv[]) {
  31   int volatile z;
  32   fn_f(z);
  33   return x;
  34 }