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; } 45