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//===-- LibStdcppTuple.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 "LibStdcpp.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/DataFormatters/FormattersHelpers.h"
#include "lldb/DataFormatters/TypeSynthetic.h"
#include "lldb/Utility/ConstString.h"
#include <memory>
#include <vector>
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
namespace {
class LibStdcppTupleSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
public:
explicit LibStdcppTupleSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
size_t CalculateNumChildren() override;
lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
bool Update() override;
bool MightHaveChildren() override;
size_t GetIndexOfChildWithName(ConstString name) 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_members;
};
} // end of anonymous namespace
LibStdcppTupleSyntheticFrontEnd::LibStdcppTupleSyntheticFrontEnd(
lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp) {
Update();
}
bool LibStdcppTupleSyntheticFrontEnd::Update() {
m_members.clear();
ValueObjectSP valobj_backend_sp = m_backend.GetSP();
if (!valobj_backend_sp)
return false;
ValueObjectSP next_child_sp = valobj_backend_sp->GetNonSyntheticValue();
while (next_child_sp != nullptr) {
ValueObjectSP current_child = next_child_sp;
next_child_sp = nullptr;
size_t child_count = current_child->GetNumChildren();
for (size_t i = 0; i < child_count; ++i) {
ValueObjectSP child_sp = current_child->GetChildAtIndex(i, true);
llvm::StringRef name_str = child_sp->GetName().GetStringRef();
if (name_str.startswith("std::_Tuple_impl<")) {
next_child_sp = child_sp;
} else if (name_str.startswith("std::_Head_base<")) {
ValueObjectSP value_sp =
child_sp->GetChildMemberWithName(ConstString("_M_head_impl"), true);
if (value_sp) {
StreamString name;
name.Printf("[%zd]", m_members.size());
m_members.push_back(value_sp->Clone(ConstString(name.GetString())).get());
}
}
}
}
return false;
}
bool LibStdcppTupleSyntheticFrontEnd::MightHaveChildren() { return true; }
lldb::ValueObjectSP
LibStdcppTupleSyntheticFrontEnd::GetChildAtIndex(size_t idx) {
if (idx < m_members.size() && m_members[idx])
return m_members[idx]->GetSP();
return lldb::ValueObjectSP();
}
size_t LibStdcppTupleSyntheticFrontEnd::CalculateNumChildren() {
return m_members.size();
}
size_t LibStdcppTupleSyntheticFrontEnd::GetIndexOfChildWithName(
ConstString name) {
return ExtractIndexFromString(name.GetCString());
}
SyntheticChildrenFrontEnd *
lldb_private::formatters::LibStdcppTupleSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
return (valobj_sp ? new LibStdcppTupleSyntheticFrontEnd(valobj_sp) : nullptr);
}
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