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| //===-- LibCxxAtomic.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 "LibCxxAtomic.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(ConstString("__a_"), true);
if (!member__a_)
return {};
ValueObjectSP member__a_value =
member__a_->GetChildMemberWithName(ConstString("__a_value"), true);
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;
size_t CalculateNumChildren() override;
lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
bool Update() override;
bool MightHaveChildren() override;
size_t GetIndexOfChildWithName(ConstString name) override;
lldb::ValueObjectSP GetSyntheticValue() override;
private:
ValueObject *m_real_child;
};
} // namespace formatters
} // namespace lldb_private
lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
LibcxxStdAtomicSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp), m_real_child(nullptr) {}
bool lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::Update() {
ValueObjectSP atomic_value = GetLibCxxAtomicValue(m_backend);
if (atomic_value)
m_real_child = GetLibCxxAtomicValue(m_backend).get();
return false;
}
bool lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
MightHaveChildren() {
return true;
}
size_t lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
CalculateNumChildren() {
return m_real_child ? m_real_child->GetNumChildren() : 0;
}
lldb::ValueObjectSP
lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::GetChildAtIndex(
size_t idx) {
return m_real_child ? m_real_child->GetChildAtIndex(idx, true) : nullptr;
}
size_t lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
GetIndexOfChildWithName(ConstString name) {
return m_real_child ? m_real_child->GetIndexOfChildWithName(name)
: UINT32_MAX;
}
lldb::ValueObjectSP lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
GetSyntheticValue() {
if (m_real_child && m_real_child->CanProvideValue())
return m_real_child->GetSP();
return nullptr;
}
SyntheticChildrenFrontEnd *
lldb_private::formatters::LibcxxAtomicSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
if (valobj_sp)
return new LibcxxStdAtomicSyntheticFrontEnd(valobj_sp);
return nullptr;
}
|