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//===-- LibCxxTuple.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 TupleFrontEnd: public SyntheticChildrenFrontEnd {
public:
TupleFrontEnd(ValueObject &valobj) : SyntheticChildrenFrontEnd(valobj) {
Update();
}
llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override {
auto optional_idx = formatters::ExtractIndexFromString(name.GetCString());
if (!optional_idx) {
return llvm::createStringError("Type has no child named '%s'",
name.AsCString());
}
return *optional_idx;
}
lldb::ChildCacheState Update() override;
llvm::Expected<uint32_t> CalculateNumChildren() override {
return m_elements.size();
}
ValueObjectSP GetChildAtIndex(uint32_t idx) override;
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).
std::vector<ValueObject*> m_elements;
ValueObject* m_base = nullptr;
};
}
lldb::ChildCacheState TupleFrontEnd::Update() {
m_elements.clear();
m_base = nullptr;
ValueObjectSP base_sp;
base_sp = m_backend.GetChildMemberWithName("__base_");
if (!base_sp) {
// Pre r304382 name of the base element.
base_sp = m_backend.GetChildMemberWithName("base_");
}
if (!base_sp)
return lldb::ChildCacheState::eRefetch;
m_base = base_sp.get();
m_elements.assign(base_sp->GetCompilerType().GetNumDirectBaseClasses(),
nullptr);
return lldb::ChildCacheState::eRefetch;
}
ValueObjectSP TupleFrontEnd::GetChildAtIndex(uint32_t idx) {
if (idx >= m_elements.size())
return ValueObjectSP();
if (!m_base)
return ValueObjectSP();
if (m_elements[idx])
return m_elements[idx]->GetSP();
CompilerType holder_type =
m_base->GetCompilerType().GetDirectBaseClassAtIndex(idx, nullptr);
if (!holder_type)
return ValueObjectSP();
ValueObjectSP holder_sp = m_base->GetChildAtIndex(idx);
if (!holder_sp)
return ValueObjectSP();
ValueObjectSP elem_sp = holder_sp->GetChildAtIndex(0);
if (elem_sp)
m_elements[idx] =
elem_sp->Clone(ConstString(llvm::formatv("[{0}]", idx).str())).get();
if (m_elements[idx])
return m_elements[idx]->GetSP();
return ValueObjectSP();
}
SyntheticChildrenFrontEnd *
formatters::LibcxxTupleFrontEndCreator(CXXSyntheticChildren *,
lldb::ValueObjectSP valobj_sp) {
if (valobj_sp)
return new TupleFrontEnd(*valobj_sp);
return nullptr;
}
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