| //===-- LibCxxBitset.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 "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(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: |
| // The lifetime of a ValueObject and all its derivative ValueObjects |
| // (children, clones, etc.) is managed by a ClusterManager. These |
| // objects are only destroyed when every shared pointer to any of them |
| // is destroyed, so we must not store a shared pointer to any ValueObject |
| // derived from our backend ValueObject (since we're in the same cluster). |
| // Value objects created from raw data (i.e. in a different cluster) must |
| // be referenced via shared pointer to keep them alive, however. |
| std::vector<ValueObjectSP> m_elements; |
| ValueObject* m_first = nullptr; |
| 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 = nullptr; |
| |
| 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).get(); |
| 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)) { |
| llvm::Optional<uint64_t> bit_size = |
| type.GetBitSize(ctx.GetBestExecutionContextScope()); |
| if (!bit_size || *bit_size == 0) |
| return {}; |
| chunk = m_first->GetChildAtIndex(idx / *bit_size, true); |
| } else { |
| type = m_first->GetCompilerType(); |
| chunk = m_first->GetSP(); |
| } |
| if (!type || !chunk) |
| return {}; |
| |
| llvm::Optional<uint64_t> bit_size = |
| type.GetBitSize(ctx.GetBestExecutionContextScope()); |
| if (!bit_size || *bit_size == 0) |
| return {}; |
| size_t chunk_idx = idx % *bit_size; |
| 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; |
| } |