public:
  LowerClusterToRuntimeOpsTest() {
    mlir::RegisterCommonToolingDialects(registry_);
    context_.appendDialectRegistry(registry_);
    context_.loadAllAvailableDialects();

    env_ = Env::Default();
    test_group_name_ = "TestGroup";
    test_dir_ = testing::TmpDir();
    setenv("TF_DUMP_GRAPH_PREFIX", test_dir_.c_str(), /*overwrite=*/1);
  }

                public Process exec(String command, String[] envp) { return null; }
                public Process exec(String command, String[] envp, File file) { return null; }
                public Process exec(String command, List<?> envp, File file) { return null; }
                public Process exec(String[] command) { return null; }
                public Process exec(String[] command, String[] envp) { return null; }

      const string file_name = absl::Substitute("api_def_$0.pbtxt", op.name());
      const string file_path = io::JoinPath(dir, file_name);
      if (env_->FileExists(file_path).ok()) {
        TF_CHECK_OK(api_def_map_->LoadFile(env_, file_path)) << file_path;
      } else {
        // API defs are currently used for only optional pieces.
      }
    }
  }

  }

  DialectRegistry registry_;
  MLIRContext context_;
  OwningOpRef<mlir::ModuleOp> mlir_module_;
  Env* env_;
  std::string test_dir_;
  std::string test_group_name_;
};

TEST_F(LoggingHooksTest, DumpsPassData) {
  std::vector<std::string> files;
  TF_ASSERT_OK(env_->GetChildren(test_dir_, &files));
  EXPECT_THAT(files, ::testing::IsEmpty());

  TF_ASSERT_OK(CreateMlirModule("dead_const.mlir"));

	// sequence of string pointers followed by a NULL, and auxv.
	// The TLS pointer should be initialized to 0.
	//
	// In an ELFv2 compliant dynamically linked binary, R3 contains argc,
	// R4 contains argv, R5 contains envp, R6 contains auxv, and R13
	// contains the TLS pointer.
	//
	// When loading via glibc, the first doubleword on the stack points
	// to NULL a value. (that is *(uintptr)(R1) == 0). This is used to

//sys	getcwd(buf []byte) (n int, err error)
//sys	sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error)
//sysnb fork() (pid int, err error)
//sysnb execve(path *byte, argv **byte, envp **byte) (err error)
//sysnb exit(res int) (err error)
//sys   ptrace(request int, pid int, addr uintptr, data uintptr) (err error)
//sysnb getentropy(p []byte) (err error)