================ @@ -0,0 +1,143 @@ +//===-- MsvcStl.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 "MsvcStl.h" + +#include "lldb/Core/Debugger.h" +#include "lldb/Core/FormatEntity.h" +#include "lldb/DataFormatters/StringPrinter.h" +#include "lldb/DataFormatters/TypeSummary.h" +#include "lldb/Utility/ConstString.h" +#include "lldb/Utility/Status.h" +#include "lldb/Utility/Stream.h" +#include "lldb/ValueObject/ValueObject.h" + +#include "Plugins/Language/CPlusPlus/CxxStringTypes.h" + +#include "lldb/lldb-forward.h" +#include <optional> +#include <tuple> + +using namespace lldb; +using namespace lldb_private; +using namespace lldb_private::formatters; + +using StringElementType = StringPrinter::StringElementType; + +static ValueObjectSP ExtractMsvcStlStringData(ValueObject &valobj) { + return valobj.GetChildAtNamePath({"_Mypair", "_Myval2"}); +} + +/// Determine the size in bytes of \p valobj (a MSVC STL std::string object) and +/// extract its data payload. Return the size + payload pair. +static std::optional<std::pair<uint64_t, ValueObjectSP>> +ExtractMsvcStlStringInfo(ValueObject &valobj, uint64_t element_size) { + ValueObjectSP valobj_pair_sp = ExtractMsvcStlStringData(valobj); + if (!valobj_pair_sp || !valobj_pair_sp->GetError().Success()) + return {}; + + ValueObjectSP size_sp = valobj_pair_sp->GetChildMemberWithName("_Mysize"); + ValueObjectSP capacity_sp = valobj_pair_sp->GetChildMemberWithName("_Myres"); + ValueObjectSP bx_sp = valobj_pair_sp->GetChildMemberWithName("_Bx"); + if (!size_sp || !capacity_sp || !bx_sp) + return {}; + + bool success = false; + uint64_t size = size_sp->GetValueAsUnsigned(0, &success); + if (!success) + return {}; + uint64_t capacity = capacity_sp->GetValueAsUnsigned(0, &success); + if (!success) + return {}; + + size_t bufSize = std::max<size_t>(16 / element_size, 1); + bool isShortString = capacity < bufSize; + + if (isShortString) { + ValueObjectSP buf_sp = bx_sp->GetChildMemberWithName("_Buf"); + if (buf_sp) + return std::make_pair(size, buf_sp); + return {}; + } + ValueObjectSP ptr_sp = bx_sp->GetChildMemberWithName("_Ptr"); + if (ptr_sp) + return std::make_pair(size, ptr_sp); + return {}; +} + +template <StringPrinter::StringElementType element_type> +static bool +MsvcStlStringSummaryProviderImpl(ValueObject &valobj, Stream &stream, + const TypeSummaryOptions &summary_options, + std::string prefix_token) { + auto string_info = ExtractMsvcStlStringInfo( + valobj, StringPrinter::ElementByteSize<element_type>()); + if (!string_info) + return false; + uint64_t size; + ValueObjectSP location_sp; + std::tie(size, location_sp) = *string_info; ---------------- Michael137 wrote:
```suggestion auto [size, location_sp] = *string_info; ``` https://github.com/llvm/llvm-project/pull/143177 _______________________________________________ lldb-commits mailing list lldb-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
