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//===-- LibCxxProxyArray.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 {
/// Data formatter for libc++'s std::"proxy_array".
///
/// A proxy_array's are created by using:
/// std::gslice_array operator[](const std::gslice& gslicearr);
/// std::mask_array operator[](const std::valarray<bool>& boolarr);
/// std::indirect_array operator[](const std::valarray<std::size_t>& indarr);
///
/// These arrays have the following members:
/// - __vp_ points to std::valarray::__begin_
/// - __1d_ an array of offsets of the elements from @a __vp_
class LibcxxStdProxyArraySyntheticFrontEnd : public SyntheticChildrenFrontEnd {
public:
LibcxxStdProxyArraySyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
~LibcxxStdProxyArraySyntheticFrontEnd() 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 the array's __vp_.
ValueObject *m_base = nullptr;
/// The type of the array's template argument T.
CompilerType m_element_type;
/// The sizeof the array's template argument T.
uint32_t m_element_size = 0;
/// A non-owning pointer to the array's __1d_.__begin_.
ValueObject *m_start = nullptr;
/// A non-owning pointer to the array's __1d_.__end_.
ValueObject *m_finish = nullptr;
/// The type of the __1d_ array's template argument T (size_t).
CompilerType m_element_type_size_t;
/// The sizeof the __1d_ array's template argument T (size_t)
uint32_t m_element_size_size_t = 0;
};
} // namespace formatters
} // namespace lldb_private
lldb_private::formatters::LibcxxStdProxyArraySyntheticFrontEnd::
LibcxxStdProxyArraySyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp), m_element_type() {
if (valobj_sp)
Update();
}
lldb_private::formatters::LibcxxStdProxyArraySyntheticFrontEnd::
~LibcxxStdProxyArraySyntheticFrontEnd() {
// these need to stay around because they are child objects who will follow
// their parent's life cycle
// delete m_base;
}
llvm::Expected<uint32_t> lldb_private::formatters::
LibcxxStdProxyArraySyntheticFrontEnd::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_size_t)
return 0;
return num_children / m_element_size_size_t;
}
lldb::ValueObjectSP
lldb_private::formatters::LibcxxStdProxyArraySyntheticFrontEnd::GetChildAtIndex(
uint32_t idx) {
if (!m_base)
return lldb::ValueObjectSP();
uint64_t offset = idx * m_element_size_size_t;
offset = offset + m_start->GetValueAsUnsigned(0);
lldb::ValueObjectSP indirect = CreateValueObjectFromAddress(
"", offset, m_backend.GetExecutionContextRef(), m_element_type_size_t);
if (!indirect)
return lldb::ValueObjectSP();
const size_t value = indirect->GetValueAsUnsigned(0);
if (!value)
return lldb::ValueObjectSP();
offset = value * m_element_size;
offset = offset + m_base->GetValueAsUnsigned(0);
StreamString name;
name.Printf("[%" PRIu64 "] -> [%zu]", (uint64_t)idx, value);
return CreateValueObjectFromAddress(name.GetString(), offset,
m_backend.GetExecutionContextRef(),
m_element_type);
}
lldb::ChildCacheState
lldb_private::formatters::LibcxxStdProxyArraySyntheticFrontEnd::Update() {
m_base = nullptr;
m_start = nullptr;
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 vector = m_backend.GetChildMemberWithName("__1d_");
if (!vector)
return ChildCacheState::eRefetch;
type = vector->GetCompilerType();
if (type.GetNumTemplateArguments() == 0)
return ChildCacheState::eRefetch;
m_element_type_size_t = type.GetTypeTemplateArgument(0);
if (std::optional<uint64_t> size = m_element_type_size_t.GetByteSize(nullptr))
m_element_size_size_t = *size;
if (m_element_size_size_t == 0)
return ChildCacheState::eRefetch;
ValueObjectSP base = m_backend.GetChildMemberWithName("__vp_");
ValueObjectSP start = vector->GetChildMemberWithName("__begin_");
ValueObjectSP finish = vector->GetChildMemberWithName("__end_");
if (!base || !start || !finish)
return ChildCacheState::eRefetch;
m_base = base.get();
m_start = start.get();
m_finish = finish.get();
return ChildCacheState::eRefetch;
}
bool lldb_private::formatters::LibcxxStdProxyArraySyntheticFrontEnd::
MightHaveChildren() {
return true;
}
size_t lldb_private::formatters::LibcxxStdProxyArraySyntheticFrontEnd::
GetIndexOfChildWithName(ConstString name) {
if (!m_base)
return std::numeric_limits<size_t>::max();
return ExtractIndexFromString(name.GetCString());
}
lldb_private::SyntheticChildrenFrontEnd *
lldb_private::formatters::LibcxxStdProxyArraySyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
if (!valobj_sp)
return nullptr;
return new LibcxxStdProxyArraySyntheticFrontEnd(valobj_sp);
}
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