| //===------------------SharedCluster.h --------------------------*- C++ -*-===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLDB_UTILITY_SHAREDCLUSTER_H |
| #define LLDB_UTILITY_SHAREDCLUSTER_H |
| |
| #include "lldb/Utility/LLDBAssert.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/ADT/SmallPtrSet.h" |
| |
| #include <memory> |
| #include <mutex> |
| |
| namespace lldb_private { |
| |
| template <class T> |
| class ClusterManager : public std::enable_shared_from_this<ClusterManager<T>> { |
| public: |
| static std::shared_ptr<ClusterManager> Create() { |
| return std::shared_ptr<ClusterManager>(new ClusterManager()); |
| } |
| |
| ~ClusterManager() { |
| for (T *obj : m_objects) |
| delete obj; |
| } |
| |
| void ManageObject(T *new_object) { |
| std::lock_guard<std::mutex> guard(m_mutex); |
| auto ret = m_objects.insert(new_object); |
| assert(ret.second && "ManageObject called twice for the same object?"); |
| (void)ret; |
| } |
| |
| std::shared_ptr<T> GetSharedPointer(T *desired_object) { |
| std::lock_guard<std::mutex> guard(m_mutex); |
| auto this_sp = this->shared_from_this(); |
| size_t count = m_objects.count(desired_object); |
| if (count == 0) { |
| lldbassert(false && "object not found in shared cluster when expected"); |
| desired_object = nullptr; |
| } |
| return {std::move(this_sp), desired_object}; |
| } |
| |
| private: |
| ClusterManager() : m_objects() {} |
| // The cluster manager is used primarily to manage the |
| // children of root ValueObjects. So it will always have |
| // one element - the root. Pointers will often have dynamic |
| // values, so having 2 entries is pretty common. It's also |
| // pretty common to have small (2,3) structs, so setting the |
| // static size to 4 will cover those cases with no allocations |
| // w/o wasting too much space. |
| llvm::SmallPtrSet<T *, 4> m_objects; |
| std::mutex m_mutex; |
| }; |
| |
| } // namespace lldb_private |
| |
| #endif // LLDB_UTILITY_SHAREDCLUSTER_H |