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//===-- 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"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_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) {
ValueObjectSP non_sythetic = valobj.GetNonSyntheticValue();
if (!non_sythetic)
return {};
ValueObjectSP member__a_ = non_sythetic->GetChildMemberWithName("__a_");
if (!member__a_)
return {};
ValueObjectSP member__a_value =
member__a_->GetChildMemberWithName("__a_value");
if (!member__a_value)
return member__a_;
return member__a_value;
}
bool lldb_private::formatters::LibCxxAtomicSummaryProvider(
ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
if (ValueObjectSP atomic_value = GetLibCxxAtomicValue(valobj)) {
std::string summary;
if (atomic_value->GetSummaryAsCString(summary, options) &&
summary.size() > 0) {
stream.Printf("%s", summary.c_str());
return true;
}
}
return false;
}
namespace lldb_private {
namespace formatters {
class LibcxxStdAtomicSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
public:
LibcxxStdAtomicSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
~LibcxxStdAtomicSyntheticFrontEnd() override = default;
llvm::Expected<uint32_t> CalculateNumChildren() override;
lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override;
lldb::ChildCacheState Update() override;
llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override;
private:
ValueObject *m_real_child = nullptr;
};
} // namespace formatters
} // namespace lldb_private
lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
LibcxxStdAtomicSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp) {}
lldb::ChildCacheState
lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::Update() {
ValueObjectSP atomic_value = GetLibCxxAtomicValue(m_backend);
if (atomic_value)
m_real_child = GetLibCxxAtomicValue(m_backend).get();
return lldb::ChildCacheState::eRefetch;
}
llvm::Expected<uint32_t> lldb_private::formatters::
LibcxxStdAtomicSyntheticFrontEnd::CalculateNumChildren() {
return m_real_child ? 1 : 0;
}
lldb::ValueObjectSP
lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::GetChildAtIndex(
uint32_t idx) {
if (idx == 0)
return m_real_child->GetSP()->Clone(ConstString("Value"));
return nullptr;
}
llvm::Expected<size_t>
lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
GetIndexOfChildWithName(ConstString name) {
if (name == "Value")
return 0;
return llvm::createStringError("Type has no child named '%s'",
name.AsCString());
}
SyntheticChildrenFrontEnd *
lldb_private::formatters::LibcxxAtomicSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
if (valobj_sp)
return new LibcxxStdAtomicSyntheticFrontEnd(valobj_sp);
return nullptr;
}
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