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| 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-exception |
| 6 | +// |
| 7 | +//===----------------------------------------------------------------------===// |
| 8 | + |
| 9 | +#include "MsvcStl.h" |
| 10 | + |
| 11 | +#include "lldb/DataFormatters/FormattersHelpers.h" |
| 12 | +#include "lldb/DataFormatters/TypeSynthetic.h" |
| 13 | + |
| 14 | +using namespace lldb; |
| 15 | + |
| 16 | +namespace lldb_private { |
| 17 | +namespace formatters { |
| 18 | + |
| 19 | +class MsvcStlDequeSyntheticFrontEnd : public SyntheticChildrenFrontEnd { |
| 20 | +public: |
| 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 | + |
| 31 | +private: |
| 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 formatters |
| 46 | +} // namespace lldb_private |
| 47 | + |
| 48 | +lldb_private::formatters::MsvcStlDequeSyntheticFrontEnd:: |
| 49 | + MsvcStlDequeSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp) |
| 50 | + : SyntheticChildrenFrontEnd(*valobj_sp) { |
| 51 | + if (valobj_sp) |
| 52 | + Update(); |
| 53 | +} |
| 54 | + |
| 55 | +llvm::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 | + |
| 62 | +lldb::ValueObjectSP |
| 63 | +lldb_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_size |
| 72 | + // _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 | + |
| 93 | +lldb::ChildCacheState |
| 94 | +lldb_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().GetNonReferenceType(); |
| 104 | + if (deque_type.IsPointerType()) |
| 105 | + deque_type = deque_type.GetPointeeType(); |
| 106 | + if (!deque_type) |
| 107 | + return lldb::eRefetch; |
| 108 | + |
| 109 | + auto block_size_decl = deque_type.GetStaticFieldWithName("_Block_size"); |
| 110 | + if (!block_size_decl) |
| 111 | + return lldb::eRefetch; |
| 112 | + auto block_size = block_size_decl.GetConstantValue(); |
| 113 | + if (!block_size.IsValid()) |
| 114 | + return lldb::eRefetch; |
| 115 | + |
| 116 | + auto element_type = deque_type.GetTypeTemplateArgument(0); |
| 117 | + if (!element_type) |
| 118 | + return lldb::eRefetch; |
| 119 | + auto element_size = element_type.GetByteSize(nullptr); |
| 120 | + if (!element_size) |
| 121 | + return lldb::eRefetch; |
| 122 | + |
| 123 | + auto offset_sp = storage_sp->GetChildMemberWithName("_Myoff"); |
| 124 | + auto map_size_sp = storage_sp->GetChildMemberWithName("_Mapsize"); |
| 125 | + auto map_sp = storage_sp->GetChildMemberWithName("_Map"); |
| 126 | + auto size_sp = storage_sp->GetChildMemberWithName("_Mysize"); |
| 127 | + if (!offset_sp || !map_size_sp || !map_sp || !size_sp) |
| 128 | + return lldb::eRefetch; |
| 129 | + |
| 130 | + bool ok = false; |
| 131 | + uint64_t offset = offset_sp->GetValueAsUnsigned(0, &ok); |
| 132 | + if (!ok) |
| 133 | + return lldb::eRefetch; |
| 134 | + |
| 135 | + uint64_t map_size = map_size_sp->GetValueAsUnsigned(0, &ok); |
| 136 | + if (!ok) |
| 137 | + return lldb::eRefetch; |
| 138 | + |
| 139 | + uint64_t size = size_sp->GetValueAsUnsigned(0, &ok); |
| 140 | + if (!ok) |
| 141 | + return lldb::eRefetch; |
| 142 | + |
| 143 | + m_map = map_sp.get(); |
| 144 | + m_exe_ctx_ref = m_backend.GetExecutionContextRef(); |
| 145 | + m_block_size = block_size.ULongLong(); |
| 146 | + m_offset = offset; |
| 147 | + m_map_size = map_size; |
| 148 | + m_element_size = *element_size; |
| 149 | + m_element_type = element_type; |
| 150 | + m_size = size; |
| 151 | + return lldb::eRefetch; |
| 152 | +} |
| 153 | + |
| 154 | +llvm::Expected<size_t> lldb_private::formatters::MsvcStlDequeSyntheticFrontEnd:: |
| 155 | + GetIndexOfChildWithName(ConstString name) { |
| 156 | + if (!m_map) |
| 157 | + return llvm::createStringError("Type has no child named '%s'", |
| 158 | + name.AsCString()); |
| 159 | + if (auto optional_idx = ExtractIndexFromString(name.GetCString())) |
| 160 | + return *optional_idx; |
| 161 | + |
| 162 | + return llvm::createStringError("Type has no child named '%s'", |
| 163 | + name.AsCString()); |
| 164 | +} |
| 165 | + |
| 166 | +bool lldb_private::formatters::IsMsvcStlDeque(ValueObject &valobj) { |
| 167 | + if (auto valobj_sp = valobj.GetNonSyntheticValue()) |
| 168 | + return valobj_sp->GetChildMemberWithName("_Mypair") != nullptr; |
| 169 | + return false; |
| 170 | +} |
| 171 | + |
| 172 | +lldb_private::SyntheticChildrenFrontEnd * |
| 173 | +lldb_private::formatters::MsvcStlDequeSyntheticFrontEndCreator( |
| 174 | + CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) { |
| 175 | + return new MsvcStlDequeSyntheticFrontEnd(valobj_sp); |
| 176 | +} |
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