//===-- LibCxxQueue.cpp ---------------------------------------------------===// // // 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 // //===----------------------------------------------------------------------===// #include "LibCxx.h" #include "lldb/DataFormatters/FormattersHelpers.h" using namespace lldb; using namespace lldb_private; namespace { class QueueFrontEnd : public SyntheticChildrenFrontEnd { public: QueueFrontEnd(ValueObject &valobj) : SyntheticChildrenFrontEnd(valobj) { Update(); } size_t GetIndexOfChildWithName(ConstString name) override { return m_container_sp ? m_container_sp->GetIndexOfChildWithName(name) : UINT32_MAX; } bool MightHaveChildren() override { return true; } bool Update() override; size_t CalculateNumChildren() override { return m_container_sp ? m_container_sp->GetNumChildren() : 0; } ValueObjectSP GetChildAtIndex(size_t idx) override { return m_container_sp ? m_container_sp->GetChildAtIndex(idx, true) : nullptr; } private: // The lifetime of a ValueObject and all its derivative ValueObjects // (children, clones, etc.) is managed by a ClusterManager. These // objects are only destroyed when every shared pointer to any of them // is destroyed, so we must not store a shared pointer to any ValueObject // derived from our backend ValueObject (since we're in the same cluster). ValueObject* m_container_sp = nullptr; }; } // namespace bool QueueFrontEnd::Update() { m_container_sp = nullptr; ValueObjectSP c_sp = m_backend.GetChildMemberWithName(ConstString("c"), true); if (!c_sp) return false; m_container_sp = c_sp->GetSyntheticValue().get(); return false; } SyntheticChildrenFrontEnd * formatters::LibcxxQueueFrontEndCreator(CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) { if (valobj_sp) return new QueueFrontEnd(*valobj_sp); return nullptr; }