Coverage Report

Created: 2022-01-18 06:27

/Users/buildslave/jenkins/workspace/coverage/llvm-project/lldb/include/lldb/Utility/UserIDResolver.h
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//===-- UserIDResolver.h ----------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLDB_UTILITY_USERIDRESOLVER_H
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#define LLDB_UTILITY_USERIDRESOLVER_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringRef.h"
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#include <mutex>
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namespace lldb_private {
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/// An abstract interface for things that know how to map numeric user/group IDs
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/// into names. It caches the resolved names to avoid repeating expensive
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/// queries. The cache is internally protected by a mutex, so concurrent queries
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/// are safe.
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class UserIDResolver {
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public:
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  typedef uint32_t id_t;
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  virtual ~UserIDResolver(); // anchor
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  llvm::Optional<llvm::StringRef> GetUserName(id_t uid) {
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    return Get(uid, m_uid_cache, &UserIDResolver::DoGetUserName);
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  }
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  llvm::Optional<llvm::StringRef> GetGroupName(id_t gid) {
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    return Get(gid, m_gid_cache, &UserIDResolver::DoGetGroupName);
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  }
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  /// Returns a resolver which returns a failure value for each query. Useful as
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  /// a fallback value for the case when we know all lookups will fail.
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  static UserIDResolver &GetNoopResolver();
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protected:
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  virtual llvm::Optional<std::string> DoGetUserName(id_t uid) = 0;
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  virtual llvm::Optional<std::string> DoGetGroupName(id_t gid) = 0;
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private:
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  using Map = llvm::DenseMap<id_t, llvm::Optional<std::string>>;
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  llvm::Optional<llvm::StringRef>
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  Get(id_t id, Map &cache,
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      llvm::Optional<std::string> (UserIDResolver::*do_get)(id_t));
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  std::mutex m_mutex;
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  Map m_uid_cache;
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  Map m_gid_cache;
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};
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} // namespace lldb_private
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#endif // LLDB_UTILITY_USERIDRESOLVER_H