| //===-- LibCxxSliceArray.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 "LibCxx.h" |
| |
| #include "lldb/Core/ValueObject.h" |
| #include "lldb/DataFormatters/FormattersHelpers.h" |
| #include <optional> |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| using namespace lldb_private::formatters; |
| |
| namespace lldb_private { |
| namespace formatters { |
| |
| bool LibcxxStdSliceArraySummaryProvider(ValueObject &valobj, Stream &stream, |
| const TypeSummaryOptions &options) { |
| ValueObjectSP obj = valobj.GetNonSyntheticValue(); |
| if (!obj) |
| return false; |
| |
| ValueObjectSP ptr_sp = obj->GetChildMemberWithName("__size_"); |
| if (!ptr_sp) |
| return false; |
| const size_t size = ptr_sp->GetValueAsUnsigned(0); |
| |
| ptr_sp = obj->GetChildMemberWithName("__stride_"); |
| if (!ptr_sp) |
| return false; |
| const size_t stride = ptr_sp->GetValueAsUnsigned(0); |
| |
| stream.Printf("stride=%zu size=%zu", stride, size); |
| |
| return true; |
| } |
| |
| /// Data formatter for libc++'s std::slice_array. |
| /// |
| /// A slice_array is created by using: |
| /// operator[](std::slice slicearr); |
| /// and std::slice is created by: |
| /// slice(std::size_t start, std::size_t size, std::size_t stride); |
| /// The std::slice_array has the following members: |
| /// - __vp_ points to std::valarray::__begin_ + @a start |
| /// - __size_ is @a size |
| /// - __stride_is @a stride |
| class LibcxxStdSliceArraySyntheticFrontEnd : public SyntheticChildrenFrontEnd { |
| public: |
| LibcxxStdSliceArraySyntheticFrontEnd(lldb::ValueObjectSP valobj_sp); |
| |
| ~LibcxxStdSliceArraySyntheticFrontEnd() override; |
| |
| llvm::Expected<uint32_t> CalculateNumChildren() override; |
| |
| lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override; |
| |
| lldb::ChildCacheState Update() override; |
| |
| bool MightHaveChildren() override; |
| |
| size_t GetIndexOfChildWithName(ConstString name) override; |
| |
| private: |
| /// A non-owning pointer to slice_array.__vp_. |
| ValueObject *m_start = nullptr; |
| /// slice_array.__size_. |
| size_t m_size = 0; |
| /// slice_array.__stride_. |
| size_t m_stride = 0; |
| /// The type of slice_array's template argument T. |
| CompilerType m_element_type; |
| /// The sizeof slice_array's template argument T. |
| uint32_t m_element_size = 0; |
| }; |
| |
| } // namespace formatters |
| } // namespace lldb_private |
| |
| lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEnd:: |
| LibcxxStdSliceArraySyntheticFrontEnd(lldb::ValueObjectSP valobj_sp) |
| : SyntheticChildrenFrontEnd(*valobj_sp), m_element_type() { |
| if (valobj_sp) |
| Update(); |
| } |
| |
| lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEnd:: |
| ~LibcxxStdSliceArraySyntheticFrontEnd() { |
| // these need to stay around because they are child objects who will follow |
| // their parent's life cycle |
| // delete m_start; |
| } |
| |
| llvm::Expected<uint32_t> lldb_private::formatters:: |
| LibcxxStdSliceArraySyntheticFrontEnd::CalculateNumChildren() { |
| return m_size; |
| } |
| |
| lldb::ValueObjectSP |
| lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEnd::GetChildAtIndex( |
| uint32_t idx) { |
| if (!m_start) |
| return lldb::ValueObjectSP(); |
| |
| uint64_t offset = idx * m_stride * m_element_size; |
| offset = offset + m_start->GetValueAsUnsigned(0); |
| StreamString name; |
| name.Printf("[%" PRIu64 "]", (uint64_t)idx); |
| return CreateValueObjectFromAddress(name.GetString(), offset, |
| m_backend.GetExecutionContextRef(), |
| m_element_type); |
| } |
| |
| lldb::ChildCacheState |
| lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEnd::Update() { |
| m_start = nullptr; |
| |
| CompilerType type = m_backend.GetCompilerType(); |
| if (type.GetNumTemplateArguments() == 0) |
| return ChildCacheState::eRefetch; |
| |
| m_element_type = type.GetTypeTemplateArgument(0); |
| if (std::optional<uint64_t> size = m_element_type.GetByteSize(nullptr)) |
| m_element_size = *size; |
| |
| if (m_element_size == 0) |
| return ChildCacheState::eRefetch; |
| |
| ValueObjectSP start = m_backend.GetChildMemberWithName("__vp_"); |
| ValueObjectSP size = m_backend.GetChildMemberWithName("__size_"); |
| ValueObjectSP stride = m_backend.GetChildMemberWithName("__stride_"); |
| |
| if (!start || !size || !stride) |
| return ChildCacheState::eRefetch; |
| |
| m_start = start.get(); |
| m_size = size->GetValueAsUnsigned(0); |
| m_stride = stride->GetValueAsUnsigned(0); |
| |
| return ChildCacheState::eRefetch; |
| } |
| |
| bool lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEnd:: |
| MightHaveChildren() { |
| return true; |
| } |
| |
| size_t lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEnd:: |
| GetIndexOfChildWithName(ConstString name) { |
| if (!m_start) |
| return std::numeric_limits<size_t>::max(); |
| return ExtractIndexFromString(name.GetCString()); |
| } |
| |
| lldb_private::SyntheticChildrenFrontEnd * |
| lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEndCreator( |
| CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) { |
| if (!valobj_sp) |
| return nullptr; |
| return new LibcxxStdSliceArraySyntheticFrontEnd(valobj_sp); |
| } |