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//===-- 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; }
lldb::ChildCacheState Update() override;
llvm::Expected<uint32_t> CalculateNumChildren() override {
return m_container_sp ? m_container_sp->GetNumChildren() : 0;
}
ValueObjectSP GetChildAtIndex(uint32_t idx) override {
return m_container_sp ? m_container_sp->GetChildAtIndex(idx)
: 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
lldb::ChildCacheState QueueFrontEnd::Update() {
m_container_sp = nullptr;
ValueObjectSP c_sp = m_backend.GetChildMemberWithName("c");
if (!c_sp)
return lldb::ChildCacheState::eRefetch;
m_container_sp = c_sp->GetSyntheticValue().get();
return lldb::ChildCacheState::eRefetch;
}
SyntheticChildrenFrontEnd *
formatters::LibcxxQueueFrontEndCreator(CXXSyntheticChildren *,
lldb::ValueObjectSP valobj_sp) {
if (valobj_sp)
return new QueueFrontEnd(*valobj_sp);
return nullptr;
}
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