contrib/llvm-project/lldb/source/Utility/UserIDResolver.cpp

   1 //===-- UserIDResolver.cpp --------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "lldb/Utility/UserIDResolver.h"
  10 #include "llvm/Support/ManagedStatic.h"
  11
  12 using namespace lldb_private;
  13
  14 UserIDResolver::~UserIDResolver() = default;
  15
  16 llvm::Optional<llvm::StringRef> UserIDResolver::Get(
  17     id_t id, Map &cache,
  18     llvm::Optional<std::string> (UserIDResolver::*do_get)(id_t)) {
  19
  20   std::lock_guard<std::mutex> guard(m_mutex);
  21   auto iter_bool = cache.try_emplace(id, llvm::None);
  22   if (iter_bool.second)
  23     iter_bool.first->second = (this->*do_get)(id);
  24   if (iter_bool.first->second)
  25     return llvm::StringRef(*iter_bool.first->second);
  26   return llvm::None;
  27 }
  28
  29 namespace {
  30 class NoopResolver : public UserIDResolver {
  31 protected:
  32   llvm::Optional<std::string> DoGetUserName(id_t uid) override {
  33     return llvm::None;
  34   }
  35
  36   llvm::Optional<std::string> DoGetGroupName(id_t gid) override {
  37     return llvm::None;
  38   }
  39 };
  40 } // namespace
  41
  42 static llvm::ManagedStatic<NoopResolver> g_noop_resolver;
  43
  44 UserIDResolver &UserIDResolver::GetNoopResolver() { return *g_noop_resolver; }