| //===-- LibCxxBitset.cpp ----------------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "LibCxx.h" |
| #include "lldb/DataFormatters/FormattersHelpers.h" |
| #include "lldb/Symbol/ClangASTContext.h" |
| #include "lldb/Target/Target.h" |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| namespace { |
| |
| class BitsetFrontEnd : public SyntheticChildrenFrontEnd { |
| public: |
| BitsetFrontEnd(ValueObject &valobj); |
| |
| size_t GetIndexOfChildWithName(const ConstString &name) override { |
| return formatters::ExtractIndexFromString(name.GetCString()); |
| } |
| |
| bool MightHaveChildren() override { return true; } |
| bool Update() override; |
| size_t CalculateNumChildren() override { return m_elements.size(); } |
| ValueObjectSP GetChildAtIndex(size_t idx) override; |
| |
| private: |
| std::vector<ValueObjectSP> m_elements; |
| ValueObjectSP m_first; |
| CompilerType m_bool_type; |
| ByteOrder m_byte_order = eByteOrderInvalid; |
| uint8_t m_byte_size = 0; |
| }; |
| } // namespace |
| |
| BitsetFrontEnd::BitsetFrontEnd(ValueObject &valobj) |
| : SyntheticChildrenFrontEnd(valobj) { |
| m_bool_type = valobj.GetCompilerType().GetBasicTypeFromAST(eBasicTypeBool); |
| if (auto target_sp = m_backend.GetTargetSP()) { |
| m_byte_order = target_sp->GetArchitecture().GetByteOrder(); |
| m_byte_size = target_sp->GetArchitecture().GetAddressByteSize(); |
| Update(); |
| } |
| } |
| |
| bool BitsetFrontEnd::Update() { |
| m_elements.clear(); |
| m_first.reset(); |
| |
| TargetSP target_sp = m_backend.GetTargetSP(); |
| if (!target_sp) |
| return false; |
| size_t capping_size = target_sp->GetMaximumNumberOfChildrenToDisplay(); |
| |
| size_t size = 0; |
| if (auto arg = m_backend.GetCompilerType().GetIntegralTemplateArgument(0)) |
| size = arg->value.getLimitedValue(capping_size); |
| |
| m_elements.assign(size, ValueObjectSP()); |
| |
| m_first = m_backend.GetChildMemberWithName(ConstString("__first_"), true); |
| return false; |
| } |
| |
| ValueObjectSP BitsetFrontEnd::GetChildAtIndex(size_t idx) { |
| if (idx >= m_elements.size() || !m_first) |
| return ValueObjectSP(); |
| |
| if (m_elements[idx]) |
| return m_elements[idx]; |
| |
| ExecutionContext ctx = m_backend.GetExecutionContextRef().Lock(false); |
| CompilerType type; |
| ValueObjectSP chunk; |
| // For small bitsets __first_ is not an array, but a plain size_t. |
| if (m_first->GetCompilerType().IsArrayType(&type, nullptr, nullptr)) |
| chunk = m_first->GetChildAtIndex( |
| idx / type.GetBitSize(ctx.GetBestExecutionContextScope()), true); |
| else { |
| type = m_first->GetCompilerType(); |
| chunk = m_first; |
| } |
| if (!type || !chunk) |
| return ValueObjectSP(); |
| |
| size_t chunk_idx = idx % type.GetBitSize(ctx.GetBestExecutionContextScope()); |
| uint8_t value = !!(chunk->GetValueAsUnsigned(0) & (uint64_t(1) << chunk_idx)); |
| DataExtractor data(&value, sizeof(value), m_byte_order, m_byte_size); |
| |
| m_elements[idx] = CreateValueObjectFromData(llvm::formatv("[{0}]", idx).str(), |
| data, ctx, m_bool_type); |
| |
| return m_elements[idx]; |
| } |
| |
| SyntheticChildrenFrontEnd *formatters::LibcxxBitsetSyntheticFrontEndCreator( |
| CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) { |
| if (valobj_sp) |
| return new BitsetFrontEnd(*valobj_sp); |
| return nullptr; |
| } |