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| //===-- LibStdcppUniquePointer.cpp ------------------------------*- C++ -*-===//
//
// 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 LibStdcppUniquePtrSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
public:
explicit LibStdcppUniquePtrSyntheticFrontEnd(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;
bool GetSummary(Stream &stream, const TypeSummaryOptions &options);
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_ptr_obj = nullptr;
ValueObject* m_obj_obj = nullptr;
ValueObject* m_del_obj = nullptr;
ValueObjectSP GetTuple();
};
} // end of anonymous namespace
LibStdcppUniquePtrSyntheticFrontEnd::LibStdcppUniquePtrSyntheticFrontEnd(
lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp) {
Update();
}
ValueObjectSP LibStdcppUniquePtrSyntheticFrontEnd::GetTuple() {
ValueObjectSP valobj_backend_sp = m_backend.GetSP();
if (!valobj_backend_sp)
return nullptr;
ValueObjectSP valobj_sp = valobj_backend_sp->GetNonSyntheticValue();
if (!valobj_sp)
return nullptr;
ValueObjectSP obj_child_sp =
valobj_sp->GetChildMemberWithName(ConstString("_M_t"), true);
if (!obj_child_sp)
return nullptr;
ValueObjectSP obj_subchild_sp =
obj_child_sp->GetChildMemberWithName(ConstString("_M_t"), true);
// if there is a _M_t subchild, the tuple is found in the obj_subchild_sp
// (for libstdc++ 6.0.23).
if (obj_subchild_sp) {
return obj_subchild_sp;
}
return obj_child_sp;
}
bool LibStdcppUniquePtrSyntheticFrontEnd::Update() {
ValueObjectSP tuple_sp = GetTuple();
if (!tuple_sp)
return false;
std::unique_ptr<SyntheticChildrenFrontEnd> tuple_frontend(
LibStdcppTupleSyntheticFrontEndCreator(nullptr, tuple_sp));
ValueObjectSP ptr_obj = tuple_frontend->GetChildAtIndex(0);
if (ptr_obj)
m_ptr_obj = ptr_obj->Clone(ConstString("pointer")).get();
ValueObjectSP del_obj = tuple_frontend->GetChildAtIndex(1);
if (del_obj)
m_del_obj = del_obj->Clone(ConstString("deleter")).get();
if (m_ptr_obj) {
Status error;
ValueObjectSP obj_obj = m_ptr_obj->Dereference(error);
if (error.Success()) {
m_obj_obj = obj_obj->Clone(ConstString("object")).get();
}
}
return false;
}
bool LibStdcppUniquePtrSyntheticFrontEnd::MightHaveChildren() { return true; }
lldb::ValueObjectSP
LibStdcppUniquePtrSyntheticFrontEnd::GetChildAtIndex(size_t idx) {
if (idx == 0 && m_ptr_obj)
return m_ptr_obj->GetSP();
if (idx == 1 && m_del_obj)
return m_del_obj->GetSP();
if (idx == 2 && m_obj_obj)
return m_obj_obj->GetSP();
return lldb::ValueObjectSP();
}
size_t LibStdcppUniquePtrSyntheticFrontEnd::CalculateNumChildren() {
if (m_del_obj)
return 2;
return 1;
}
size_t LibStdcppUniquePtrSyntheticFrontEnd::GetIndexOfChildWithName(
ConstString name) {
if (name == "ptr" || name == "pointer")
return 0;
if (name == "del" || name == "deleter")
return 1;
if (name == "obj" || name == "object" || name == "$$dereference$$")
return 2;
return UINT32_MAX;
}
bool LibStdcppUniquePtrSyntheticFrontEnd::GetSummary(
Stream &stream, const TypeSummaryOptions &options) {
if (!m_ptr_obj)
return false;
bool success;
uint64_t ptr_value = m_ptr_obj->GetValueAsUnsigned(0, &success);
if (!success)
return false;
if (ptr_value == 0)
stream.Printf("nullptr");
else
stream.Printf("0x%" PRIx64, ptr_value);
return true;
}
SyntheticChildrenFrontEnd *
lldb_private::formatters::LibStdcppUniquePtrSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
return (valobj_sp ? new LibStdcppUniquePtrSyntheticFrontEnd(valobj_sp)
: nullptr);
}
bool lldb_private::formatters::LibStdcppUniquePointerSummaryProvider(
ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
LibStdcppUniquePtrSyntheticFrontEnd formatter(valobj.GetSP());
return formatter.GetSummary(stream, options);
}
|