1 files changed, 45 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Utility/UserIDResolver.cpp b/contrib/llvm-project/lldb/source/Utility/UserIDResolver.cpp
new file mode 100644
index 000000000000..83e033f32310
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Utility/UserIDResolver.cpp
@@ -0,0 +1,45 @@
+//===-- UserIDResolver.cpp ------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Utility/UserIDResolver.h"
+#include "llvm/Support/ManagedStatic.h"
+#include <optional>
+
+using namespace lldb_private;
+
+UserIDResolver::~UserIDResolver() = default;
+
+std::optional<llvm::StringRef> UserIDResolver::Get(
+    id_t id, Map &cache,
+    std::optional<std::string> (UserIDResolver::*do_get)(id_t)) {
+
+  std::lock_guard<std::mutex> guard(m_mutex);
+  auto iter_bool = cache.try_emplace(id, std::nullopt);
+  if (iter_bool.second)
+    iter_bool.first->second = (this->*do_get)(id);
+  if (iter_bool.first->second)
+    return llvm::StringRef(*iter_bool.first->second);
+  return std::nullopt;
+}
+
+namespace {
+class NoopResolver : public UserIDResolver {
+protected:
+  std::optional<std::string> DoGetUserName(id_t uid) override {
+    return std::nullopt;
+  }
+
+  std::optional<std::string> DoGetGroupName(id_t gid) override {
+    return std::nullopt;
+  }
+};
+} // namespace
+
+static llvm::ManagedStatic<NoopResolver> g_noop_resolver;
+
+UserIDResolver &UserIDResolver::GetNoopResolver() { return *g_noop_resolver; }