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//===-- MsvcStlTuple.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 "MsvcStl.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;
};
} // namespace
lldb::ChildCacheState TupleFrontEnd::Update() {
m_elements.clear();
size_t n_elements = 0;
for (CompilerType ty = m_backend.GetCompilerType();
ty.GetNumDirectBaseClasses() > 0;
ty = ty.GetDirectBaseClassAtIndex(0, nullptr))
++n_elements;
m_elements.assign(n_elements, nullptr);
return lldb::ChildCacheState::eRefetch;
}
ValueObjectSP TupleFrontEnd::GetChildAtIndex(uint32_t idx) {
if (idx >= m_elements.size())
return nullptr;
if (m_elements[idx])
return m_elements[idx]->GetSP();
CompilerType holder_ty = m_backend.GetCompilerType();
for (uint32_t i = 0; i < idx; i++) {
holder_ty = holder_ty.GetDirectBaseClassAtIndex(0, nullptr);
if (!holder_ty.IsValid())
return nullptr;
}
ValueObjectSP holder_sp = m_backend.Cast(holder_ty);
if (!holder_sp)
return nullptr;
holder_sp = holder_sp->GetChildMemberWithName("_Myfirst");
if (!holder_sp)
return nullptr;
ValueObjectSP val_sp = holder_sp->GetChildMemberWithName("_Val");
if (!val_sp)
return nullptr;
m_elements[idx] =
val_sp->Clone(ConstString(llvm::formatv("[{0}]", idx).str())).get();
return m_elements[idx]->GetSP();
}
bool formatters::IsMsvcStlTuple(ValueObject &valobj) {
// This returns false for empty tuples, but the libstdc++ formatter handles
// this correctly.
if (auto valobj_sp = valobj.GetNonSyntheticValue())
return valobj_sp->GetChildMemberWithName("_Myfirst") != nullptr;
return false;
}
SyntheticChildrenFrontEnd *formatters::MsvcStlTupleSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
if (valobj_sp)
return new TupleFrontEnd(*valobj_sp);
return nullptr;
}
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