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//===-- 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/DataFormatters/FormattersHelpers.h"
#include "lldb/ValueObject/ValueObject.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;
llvm::Expected<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 =
llvm::expectedToOptional(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;
}
llvm::Expected<size_t>
lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEnd::
GetIndexOfChildWithName(ConstString name) {
if (!m_start)
return llvm::createStringError("Type has no child named '%s'",
name.AsCString());
auto optional_idx = formatters::ExtractIndexFromString(name.GetCString());
if (!optional_idx) {
return llvm::createStringError("Type has no child named '%s'",
name.AsCString());
}
return *optional_idx;
}
lldb_private::SyntheticChildrenFrontEnd *
lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
if (!valobj_sp)
return nullptr;
return new LibcxxStdSliceArraySyntheticFrontEnd(valobj_sp);
}
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