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//===-- LibCxxValarray.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 {
class LibcxxStdValarraySyntheticFrontEnd : public SyntheticChildrenFrontEnd {
public:
LibcxxStdValarraySyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
~LibcxxStdValarraySyntheticFrontEnd() 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 valarray's __begin_ member.
ValueObject *m_start = nullptr;
/// A non-owning pointer to valarray's __end_ member.
ValueObject *m_finish = nullptr;
/// The type of valarray's template argument T.
CompilerType m_element_type;
/// The sizeof valarray's template argument T.
uint32_t m_element_size = 0;
};
} // namespace formatters
} // namespace lldb_private
lldb_private::formatters::LibcxxStdValarraySyntheticFrontEnd::
LibcxxStdValarraySyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp), m_element_type() {
if (valobj_sp)
Update();
}
lldb_private::formatters::LibcxxStdValarraySyntheticFrontEnd::
~LibcxxStdValarraySyntheticFrontEnd() {
// these need to stay around because they are child objects who will follow
// their parent's life cycle
// delete m_start;
// delete m_finish;
}
llvm::Expected<uint32_t> lldb_private::formatters::
LibcxxStdValarraySyntheticFrontEnd::CalculateNumChildren() {
if (!m_start || !m_finish)
return 0;
uint64_t start_val = m_start->GetValueAsUnsigned(0);
uint64_t finish_val = m_finish->GetValueAsUnsigned(0);
if (start_val == 0 || finish_val == 0)
return 0;
if (start_val >= finish_val)
return 0;
size_t num_children = (finish_val - start_val);
if (num_children % m_element_size)
return 0;
return num_children / m_element_size;
}
lldb::ValueObjectSP
lldb_private::formatters::LibcxxStdValarraySyntheticFrontEnd::GetChildAtIndex(
uint32_t idx) {
if (!m_start || !m_finish)
return lldb::ValueObjectSP();
uint64_t offset = idx * 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::LibcxxStdValarraySyntheticFrontEnd::Update() {
m_start = m_finish = 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("__begin_");
ValueObjectSP finish = m_backend.GetChildMemberWithName("__end_");
if (!start || !finish)
return ChildCacheState::eRefetch;
m_start = start.get();
m_finish = finish.get();
return ChildCacheState::eRefetch;
}
bool lldb_private::formatters::LibcxxStdValarraySyntheticFrontEnd::
MightHaveChildren() {
return true;
}
size_t lldb_private::formatters::LibcxxStdValarraySyntheticFrontEnd::
GetIndexOfChildWithName(ConstString name) {
if (!m_start || !m_finish)
return std::numeric_limits<size_t>::max();
return ExtractIndexFromString(name.GetCString());
}
lldb_private::SyntheticChildrenFrontEnd *
lldb_private::formatters::LibcxxStdValarraySyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
if (!valobj_sp)
return nullptr;
return new LibcxxStdValarraySyntheticFrontEnd(valobj_sp);
}
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