llvm-project/compiler-rt/test/msan/heap-origin.cc

// RUN: %clangxx_msan -m64 -O0 %s -o %t && not %run %t >%t.out 2>&1
// RUN: FileCheck %s < %t.out
// RUN: %clangxx_msan -m64 -O1 %s -o %t && not %run %t >%t.out 2>&1
// RUN: FileCheck %s < %t.out
// RUN: %clangxx_msan -m64 -O2 %s -o %t && not %run %t >%t.out 2>&1
// RUN: FileCheck %s < %t.out
// RUN: %clangxx_msan -m64 -O3 %s -o %t && not %run %t >%t.out 2>&1
// RUN: FileCheck %s < %t.out

// RUN: %clangxx_msan -fsanitize-memory-track-origins -m64 -O0 %s -o %t && not %run %t >%t.out 2>&1
// RUN: FileCheck %s < %t.out && FileCheck %s --check-prefix=CHECK-ORIGINS < %t.out
// RUN: %clangxx_msan -fsanitize-memory-track-origins -m64 -O1 %s -o %t && not %run %t >%t.out 2>&1
// RUN: FileCheck %s < %t.out && FileCheck %s --check-prefix=CHECK-ORIGINS < %t.out
// RUN: %clangxx_msan -fsanitize-memory-track-origins -m64 -O2 %s -o %t && not %run %t >%t.out 2>&1
// RUN: FileCheck %s < %t.out && FileCheck %s --check-prefix=CHECK-ORIGINS < %t.out
// RUN: %clangxx_msan -fsanitize-memory-track-origins -m64 -O3 %s -o %t && not %run %t >%t.out 2>&1
// RUN: FileCheck %s < %t.out && FileCheck %s --check-prefix=CHECK-ORIGINS < %t.out

#include <stdlib.h>
int main(int argc, char **argv) {
  char *volatile x = (char*)malloc(5 * sizeof(char));
  return *x;
  // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
  // CHECK: {{#0 0x.* in main .*heap-origin.cc:}}[[@LINE-2]]

  // CHECK-ORIGINS: Uninitialized value was created by a heap allocation
  // CHECK-ORIGINS: {{#0 0x.* in .*malloc}}
  // CHECK-ORIGINS: {{#1 0x.* in main .*heap-origin.cc:}}[[@LINE-7]]

  // CHECK: SUMMARY: MemorySanitizer: use-of-uninitialized-value {{.*heap-origin.cc:.* main}}
}