175 lines · cpp
1//===-- MsvcStlDeque.cpp --------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "MsvcStl.h"10 11#include "lldb/DataFormatters/FormattersHelpers.h"12#include "lldb/DataFormatters/TypeSynthetic.h"13 14using namespace lldb;15 16namespace lldb_private {17namespace formatters {18 19class MsvcStlDequeSyntheticFrontEnd : public SyntheticChildrenFrontEnd {20public:21 MsvcStlDequeSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);22 23 llvm::Expected<uint32_t> CalculateNumChildren() override;24 25 lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override;26 27 lldb::ChildCacheState Update() override;28 29 llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override;30 31private:32 ValueObject *m_map = nullptr;33 ExecutionContextRef m_exe_ctx_ref;34 35 size_t m_block_size = 0;36 size_t m_offset = 0;37 size_t m_map_size = 0;38 39 size_t m_element_size = 0;40 CompilerType m_element_type;41 42 uint32_t m_size = 0;43};44 45} // namespace formatters46} // namespace lldb_private47 48lldb_private::formatters::MsvcStlDequeSyntheticFrontEnd::49 MsvcStlDequeSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)50 : SyntheticChildrenFrontEnd(*valobj_sp) {51 if (valobj_sp)52 Update();53}54 55llvm::Expected<uint32_t> lldb_private::formatters::56 MsvcStlDequeSyntheticFrontEnd::CalculateNumChildren() {57 if (!m_map)58 return llvm::createStringError("Failed to read size");59 return m_size;60}61 62lldb::ValueObjectSP63lldb_private::formatters::MsvcStlDequeSyntheticFrontEnd::GetChildAtIndex(64 uint32_t idx) {65 if (idx >= m_size || !m_map)66 return nullptr;67 ProcessSP process_sp(m_exe_ctx_ref.GetProcessSP());68 if (!process_sp)69 return nullptr;70 71 // _EEN_DS = _Block_size72 // _Map[(($i + _Myoff) / _EEN_DS) % _Mapsize][($i + _Myoff) % _EEN_DS]73 size_t first_idx = ((idx + m_offset) / m_block_size) % m_map_size;74 lldb::addr_t first_address = m_map->GetValueAsUnsigned(0) +75 first_idx * process_sp->GetAddressByteSize();76 77 Status err;78 lldb::addr_t second_base =79 process_sp->ReadPointerFromMemory(first_address, err);80 if (err.Fail())81 return nullptr;82 83 size_t second_idx = (idx + m_offset) % m_block_size;84 size_t second_address = second_base + second_idx * m_element_size;85 86 StreamString name;87 name.Printf("[%" PRIu64 "]", (uint64_t)idx);88 return CreateValueObjectFromAddress(name.GetString(), second_address,89 m_backend.GetExecutionContextRef(),90 m_element_type);91}92 93lldb::ChildCacheState94lldb_private::formatters::MsvcStlDequeSyntheticFrontEnd::Update() {95 m_size = 0;96 m_map = nullptr;97 m_element_type.Clear();98 99 auto storage_sp = m_backend.GetChildAtNamePath({"_Mypair", "_Myval2"});100 if (!storage_sp)101 return lldb::eRefetch;102 103 auto deque_type = m_backend.GetCompilerType();104 if (!deque_type)105 return lldb::eRefetch;106 107 auto block_size_decl = deque_type.GetStaticFieldWithName("_Block_size");108 if (!block_size_decl)109 return lldb::eRefetch;110 auto block_size = block_size_decl.GetConstantValue();111 if (!block_size.IsValid())112 return lldb::eRefetch;113 114 auto element_type = deque_type.GetTypeTemplateArgument(0);115 if (!element_type)116 return lldb::eRefetch;117 auto element_size = element_type.GetByteSize(nullptr);118 if (!element_size)119 return lldb::eRefetch;120 121 auto offset_sp = storage_sp->GetChildMemberWithName("_Myoff");122 auto map_size_sp = storage_sp->GetChildMemberWithName("_Mapsize");123 auto map_sp = storage_sp->GetChildMemberWithName("_Map");124 auto size_sp = storage_sp->GetChildMemberWithName("_Mysize");125 if (!offset_sp || !map_size_sp || !map_sp || !size_sp)126 return lldb::eRefetch;127 128 bool ok = false;129 uint64_t offset = offset_sp->GetValueAsUnsigned(0, &ok);130 if (!ok)131 return lldb::eRefetch;132 133 uint64_t map_size = map_size_sp->GetValueAsUnsigned(0, &ok);134 if (!ok)135 return lldb::eRefetch;136 137 uint64_t size = size_sp->GetValueAsUnsigned(0, &ok);138 if (!ok)139 return lldb::eRefetch;140 141 m_map = map_sp.get();142 m_exe_ctx_ref = m_backend.GetExecutionContextRef();143 m_block_size = block_size.ULongLong();144 m_offset = offset;145 m_map_size = map_size;146 m_element_size = *element_size;147 m_element_type = element_type;148 m_size = size;149 return lldb::eRefetch;150}151 152llvm::Expected<size_t> lldb_private::formatters::MsvcStlDequeSyntheticFrontEnd::153 GetIndexOfChildWithName(ConstString name) {154 if (!m_map)155 return llvm::createStringError("Type has no child named '%s'",156 name.AsCString());157 if (auto optional_idx = ExtractIndexFromString(name.GetCString()))158 return *optional_idx;159 160 return llvm::createStringError("Type has no child named '%s'",161 name.AsCString());162}163 164bool lldb_private::formatters::IsMsvcStlDeque(ValueObject &valobj) {165 if (auto valobj_sp = valobj.GetNonSyntheticValue())166 return valobj_sp->GetChildMemberWithName("_Mypair") != nullptr;167 return false;168}169 170lldb_private::SyntheticChildrenFrontEnd *171lldb_private::formatters::MsvcStlDequeSyntheticFrontEndCreator(172 CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {173 return new MsvcStlDequeSyntheticFrontEnd(valobj_sp);174}175