833e3d109b
Summary: r284830 added a summary provider for unique_ptr in libstdc++, whose value printed the value of the pointee. This is a bit unintuitive as it becomes unobvious that the value actually is a pointer, and we lose the way to actually obtain the pointer value. Change that to print the pointer value instead. The pointee value can still be obtained through the synthetic children. Reviewers: tberghammer, granata.enrico Subscribers: lldb-commits Differential Revision: https://reviews.llvm.org/D26403 llvm-svn: 286355
152 lines
4.1 KiB
C++
152 lines
4.1 KiB
C++
//===-- LibStdcppUniquePointer.cpp ------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "LibStdcpp.h"
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#include "lldb/Core/ConstString.h"
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#include "lldb/Core/ValueObject.h"
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#include "lldb/DataFormatters/FormattersHelpers.h"
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#include "lldb/DataFormatters/TypeSynthetic.h"
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#include <memory>
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#include <vector>
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using namespace lldb;
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using namespace lldb_private;
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using namespace lldb_private::formatters;
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namespace {
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class LibStdcppUniquePtrSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
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public:
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explicit LibStdcppUniquePtrSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
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size_t CalculateNumChildren() override;
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lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
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bool Update() override;
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bool MightHaveChildren() override;
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size_t GetIndexOfChildWithName(const ConstString &name) override;
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bool GetSummary(Stream &stream, const TypeSummaryOptions &options);
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private:
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ValueObjectSP m_ptr_obj;
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ValueObjectSP m_obj_obj;
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ValueObjectSP m_del_obj;
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};
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} // end of anonymous namespace
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LibStdcppUniquePtrSyntheticFrontEnd::LibStdcppUniquePtrSyntheticFrontEnd(
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lldb::ValueObjectSP valobj_sp)
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: SyntheticChildrenFrontEnd(*valobj_sp) {
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Update();
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}
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bool LibStdcppUniquePtrSyntheticFrontEnd::Update() {
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ValueObjectSP valobj_backend_sp = m_backend.GetSP();
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if (!valobj_backend_sp)
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return false;
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ValueObjectSP valobj_sp = valobj_backend_sp->GetNonSyntheticValue();
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if (!valobj_sp)
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return false;
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ValueObjectSP tuple_sp =
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valobj_sp->GetChildMemberWithName(ConstString("_M_t"), true);
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if (!tuple_sp)
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return false;
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std::unique_ptr<SyntheticChildrenFrontEnd> tuple_frontend(
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LibStdcppTupleSyntheticFrontEndCreator(nullptr, tuple_sp));
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m_ptr_obj = tuple_frontend->GetChildAtIndex(0);
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if (m_ptr_obj)
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m_ptr_obj->SetName(ConstString("pointer"));
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m_del_obj = tuple_frontend->GetChildAtIndex(1);
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if (m_del_obj)
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m_del_obj->SetName(ConstString("deleter"));
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if (m_ptr_obj) {
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Error error;
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m_obj_obj = m_ptr_obj->Dereference(error);
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if (error.Success()) {
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m_obj_obj->SetName(ConstString("object"));
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}
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}
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return false;
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}
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bool LibStdcppUniquePtrSyntheticFrontEnd::MightHaveChildren() { return true; }
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lldb::ValueObjectSP
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LibStdcppUniquePtrSyntheticFrontEnd::GetChildAtIndex(size_t idx) {
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if (idx == 0)
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return m_obj_obj;
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if (idx == 1)
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return m_del_obj;
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if (idx == 2)
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return m_ptr_obj;
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return lldb::ValueObjectSP();
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}
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size_t LibStdcppUniquePtrSyntheticFrontEnd::CalculateNumChildren() {
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if (m_del_obj)
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return 2;
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if (m_ptr_obj && m_ptr_obj->GetValueAsUnsigned(0) != 0)
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return 1;
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return 0;
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}
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size_t LibStdcppUniquePtrSyntheticFrontEnd::GetIndexOfChildWithName(
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const ConstString &name) {
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if (name == ConstString("obj") || name == ConstString("object"))
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return 0;
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if (name == ConstString("del") || name == ConstString("deleter"))
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return 1;
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if (name == ConstString("ptr") || name == ConstString("pointer"))
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return 2;
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return UINT32_MAX;
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}
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bool LibStdcppUniquePtrSyntheticFrontEnd::GetSummary(
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Stream &stream, const TypeSummaryOptions &options) {
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if (!m_ptr_obj)
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return false;
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bool success;
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uint64_t ptr_value = m_ptr_obj->GetValueAsUnsigned(0, &success);
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if (!success)
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return false;
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if (ptr_value == 0)
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stream.Printf("nullptr");
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else
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stream.Printf("0x%" PRIx64, ptr_value);
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return true;
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}
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SyntheticChildrenFrontEnd *
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lldb_private::formatters::LibStdcppUniquePtrSyntheticFrontEndCreator(
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CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
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return (valobj_sp ? new LibStdcppUniquePtrSyntheticFrontEnd(valobj_sp)
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: nullptr);
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}
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bool lldb_private::formatters::LibStdcppUniquePointerSummaryProvider(
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ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
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LibStdcppUniquePtrSyntheticFrontEnd formatter(valobj.GetSP());
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return formatter.GetSummary(stream, options);
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}
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