1 //===-- UserIDResolver.cpp ------------------------------------------------===// 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 #include <optional> 12 13 using namespace lldb_private; 14 15 UserIDResolver::~UserIDResolver() = default; 16 Get(id_t id,Map & cache,std::optional<std::string> (UserIDResolver::* do_get)(id_t))17std::optional<llvm::StringRef> UserIDResolver::Get( 18 id_t id, Map &cache, 19 std::optional<std::string> (UserIDResolver::*do_get)(id_t)) { 20 21 std::lock_guard<std::mutex> guard(m_mutex); 22 auto iter_bool = cache.try_emplace(id, std::nullopt); 23 if (iter_bool.second) 24 iter_bool.first->second = (this->*do_get)(id); 25 if (iter_bool.first->second) 26 return llvm::StringRef(*iter_bool.first->second); 27 return std::nullopt; 28 } 29 30 namespace { 31 class NoopResolver : public UserIDResolver { 32 protected: DoGetUserName(id_t uid)33 std::optional<std::string> DoGetUserName(id_t uid) override { 34 return std::nullopt; 35 } 36 DoGetGroupName(id_t gid)37 std::optional<std::string> DoGetGroupName(id_t gid) override { 38 return std::nullopt; 39 } 40 }; 41 } // namespace 42 43 static llvm::ManagedStatic<NoopResolver> g_noop_resolver; 44 GetNoopResolver()45UserIDResolver &UserIDResolver::GetNoopResolver() { return *g_noop_resolver; } 46