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