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📁 ..
📄 BlockPointer.cpp(7.04 KB)
📄 BlockPointer.h(963 B)
📄 CPlusPlusLanguage.cpp(45.02 KB)
📄 CPlusPlusLanguage.h(4.25 KB)
📄 CPlusPlusNameParser.cpp(19.55 KB)
📄 CPlusPlusNameParser.h(5.18 KB)
📄 CxxStringTypes.cpp(8.31 KB)
📄 CxxStringTypes.h(1.86 KB)
📄 LibCxx.cpp(26.28 KB)
📄 LibCxx.h(6.14 KB)
📄 LibCxxAtomic.cpp(4.36 KB)
📄 LibCxxAtomic.h(1.15 KB)
📄 LibCxxBitset.cpp(4.08 KB)
📄 LibCxxInitializerList.cpp(3.8 KB)
📄 LibCxxList.cpp(12.13 KB)
📄 LibCxxMap.cpp(13.8 KB)
📄 LibCxxOptional.cpp(2.54 KB)
📄 LibCxxQueue.cpp(2.08 KB)
📄 LibCxxTuple.cpp(2.88 KB)
📄 LibCxxUnorderedMap.cpp(7.59 KB)
📄 LibCxxVariant.cpp(6.64 KB)
📄 LibCxxVariant.h(1.1 KB)
📄 LibCxxVector.cpp(8.98 KB)
📄 LibStdcpp.cpp(12.73 KB)
📄 LibStdcpp.h(2.22 KB)
📄 LibStdcppTuple.cpp(3.49 KB)
📄 LibStdcppUniquePointer.cpp(4.97 KB)
📄 MSVCUndecoratedNameParser.cpp(2.64 KB)
📄 MSVCUndecoratedNameParser.h(1.59 KB)

Editing: LibCxxOptional.cpp

//===-- LibCxxOptional.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 OptionalFrontEnd : public SyntheticChildrenFrontEnd {
public:
  OptionalFrontEnd(ValueObject &valobj) : SyntheticChildrenFrontEnd(valobj) {
    Update();
  }

size_t GetIndexOfChildWithName(ConstString name) override {
    return formatters::ExtractIndexFromString(name.GetCString());
  }

bool MightHaveChildren() override { return true; }
  bool Update() override;
  size_t CalculateNumChildren() override { return m_has_value ? 1U : 0U; }
  ValueObjectSP GetChildAtIndex(size_t idx) override;

private:
  /// True iff the option contains a value.
  bool m_has_value = false;
};
} // namespace

bool OptionalFrontEnd::Update() {
  ValueObjectSP engaged_sp(
      m_backend.GetChildMemberWithName(ConstString("__engaged_"), true));

if (!engaged_sp)
    return false;

// __engaged_ is a bool flag and is true if the optional contains a value.
  // Converting it to unsigned gives us a size of 1 if it contains a value
  // and 0 if not.
  m_has_value = engaged_sp->GetValueAsUnsigned(0) == 1;

return false;
}

ValueObjectSP OptionalFrontEnd::GetChildAtIndex(size_t idx) {
  if (!m_has_value)
    return ValueObjectSP();

// __val_ contains the underlying value of an optional if it has one.
  // Currently because it is part of an anonymous union GetChildMemberWithName()
  // does not peer through and find it unless we are at the parent itself.
  // We can obtain the parent through __engaged_.
  ValueObjectSP val_sp(
      m_backend.GetChildMemberWithName(ConstString("__engaged_"), true)
          ->GetParent()
          ->GetChildAtIndex(0, true)
          ->GetChildMemberWithName(ConstString("__val_"), true));

if (!val_sp)
    return ValueObjectSP();

CompilerType holder_type = val_sp->GetCompilerType();

if (!holder_type)
    return ValueObjectSP();

return val_sp->Clone(ConstString("Value"));
}

SyntheticChildrenFrontEnd *
formatters::LibcxxOptionalFrontEndCreator(CXXSyntheticChildren *,
                                          lldb::ValueObjectSP valobj_sp) {
  if (valobj_sp)
    return new OptionalFrontEnd(*valobj_sp);
  return nullptr;
}

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Editing: LibCxxOptional.cpp

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