llvm-project/compiler-rt/test/msan/chained_origin.cc

// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -m64 -O3 %s -o %t && \
// RUN:     not %t >%t.out 2>&1
// RUN: FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-STACK < %t.out

// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -DHEAP=1 -m64 -O3 %s -o %t && \
// RUN:     not %t >%t.out 2>&1
// RUN: FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-HEAP < %t.out

#include <stdio.h>

volatile int x, y;

__attribute__((noinline))
void fn_g(int a) {
  x = a;
}

__attribute__((noinline))
void fn_f(int a) {
  fn_g(a);
}

__attribute__((noinline))
void fn_h() {
  y = x;
}

int main(int argc, char *argv[]) {
#ifdef HEAP
  int * volatile zz = new int;
  int z = *zz;
#else
  int volatile z;
#endif
  fn_f(z);
  fn_h();
  return y;
}

// CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
// CHECK: {{#0 .* in main.*chained_origin.cc:37}}

// CHECK: Uninitialized value was stored to memory at
// CHECK: {{#0 .* in fn_h.*chained_origin.cc:25}}
// CHECK: {{#1 .* in main.*chained_origin.cc:36}}

// CHECK: Uninitialized value was stored to memory at
// CHECK: {{#0 .* in fn_g.*chained_origin.cc:15}}
// CHECK: {{#1 .* in fn_f.*chained_origin.cc:20}}
// CHECK: {{#2 .* in main.*chained_origin.cc:35}}

// CHECK-STACK: Uninitialized value was created by an allocation of 'z' in the stack frame of function 'main'
// CHECK-STACK: {{#0 .* in main.*chained_origin.cc:28}}

// CHECK-HEAP: Uninitialized value was created by a heap allocation
// CHECK-HEAP: {{#1 .* in main.*chained_origin.cc:30}}