llvm/lldb/source/Plugins/Language/CPlusPlus/LibCxxAtomic.cpp

//===-- LibCxxAtomic.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 "LibCxxAtomic.h"
#include "lldb/DataFormatters/FormattersHelpers.h"

usingnamespacelldb;
usingnamespacelldb_private;
usingnamespacelldb_private::formatters;

//
// We are supporting two versions of libc++ std::atomic
//
// Given std::atomic<int> i;
//
// The previous version of std::atomic was laid out like this
//
// (lldb) frame var -L -R i
// 0x00007ffeefbff9a0: (std::__1::atomic<int>) i = {
// 0x00007ffeefbff9a0:   std::__1::__atomic_base<int, true> = {
// 0x00007ffeefbff9a0:     std::__1::__atomic_base<int, false> = {
// 0x00007ffeefbff9a0:       __a_ = 5
//        }
//    }
// }
//
// In this case we need to obtain __a_ and the current version is laid out as so
//
// (lldb) frame var -L -R i
// 0x00007ffeefbff9b0: (std::__1::atomic<int>) i = {
// 0x00007ffeefbff9b0:   std::__1::__atomic_base<int, true> = {
// 0x00007ffeefbff9b0:     std::__1::__atomic_base<int, false> = {
// 0x00007ffeefbff9b0:       __a_ = {
// 0x00007ffeefbff9b0:         std::__1::__cxx_atomic_base_impl<int> = {
// 0x00007ffeefbff9b0:           __a_value = 5
//                }
//          }
//       }
//    }
//}
//
// In this case we need to obtain __a_value
//
// The below method covers both cases and returns the relevant member as a
// ValueObjectSP
//
ValueObjectSP
lldb_private::formatters::GetLibCxxAtomicValue(ValueObject &valobj) { … }

bool lldb_private::formatters::LibCxxAtomicSummaryProvider(
    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) { … }

namespace lldb_private {
namespace formatters {
class LibcxxStdAtomicSyntheticFrontEnd : public SyntheticChildrenFrontEnd { … };
} // namespace formatters
} // namespace lldb_private

lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
    LibcxxStdAtomicSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
    : … { … }

lldb::ChildCacheState
lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::Update() { … }

bool lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
    MightHaveChildren() { … }

llvm::Expected<uint32_t> lldb_private::formatters::
    LibcxxStdAtomicSyntheticFrontEnd::CalculateNumChildren() { … }

lldb::ValueObjectSP
lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::GetChildAtIndex(
    uint32_t idx) { … }

size_t lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
    GetIndexOfChildWithName(ConstString name) { … }

SyntheticChildrenFrontEnd *
lldb_private::formatters::LibcxxAtomicSyntheticFrontEndCreator(
    CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) { … }