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//===----------------------------------------------------------------------===//
//
// 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 "MsvcStl.h"
#include "lldb/DataFormatters/FormattersHelpers.h"
#include "lldb/Utility/ConstString.h"
#include "lldb/ValueObject/ValueObject.h"
#include <optional>
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
namespace lldb_private::formatters {
class MsvcStlSpanSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
public:
MsvcStlSpanSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
~MsvcStlSpanSyntheticFrontEnd() override = default;
llvm::Expected<uint32_t> CalculateNumChildren() override {
return m_num_elements;
}
lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override;
lldb::ChildCacheState Update() override;
llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override;
private:
ValueObject *m_start = nullptr; ///< First element of span. Held, not owned.
CompilerType m_element_type{}; ///< Type of span elements.
size_t m_num_elements = 0; ///< Number of elements in span.
uint32_t m_element_size = 0; ///< Size in bytes of each span element.
};
lldb_private::formatters::MsvcStlSpanSyntheticFrontEnd::
MsvcStlSpanSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp) {
if (valobj_sp)
Update();
}
lldb::ValueObjectSP
lldb_private::formatters::MsvcStlSpanSyntheticFrontEnd::GetChildAtIndex(
uint32_t idx) {
if (!m_start)
return {};
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::MsvcStlSpanSyntheticFrontEnd::Update() {
m_start = nullptr;
m_element_type = CompilerType();
m_num_elements = 0;
m_element_size = 0;
ValueObjectSP data_sp = m_backend.GetChildMemberWithName("_Mydata");
if (!data_sp)
return lldb::ChildCacheState::eRefetch;
m_element_type = data_sp->GetCompilerType().GetPointeeType();
// Get element size.
llvm::Expected<uint64_t> size_or_err = m_element_type.GetByteSize(nullptr);
if (!size_or_err) {
LLDB_LOG_ERRORV(GetLog(LLDBLog::DataFormatters), size_or_err.takeError(),
"{0}");
return lldb::ChildCacheState::eRefetch;
}
m_element_size = *size_or_err;
// Get data.
if (m_element_size > 0)
m_start = data_sp.get();
// Get number of elements.
if (auto size_sp = m_backend.GetChildMemberWithName("_Mysize"))
m_num_elements = size_sp->GetValueAsUnsigned(0);
else if (auto field =
m_backend.GetCompilerType()
.GetDirectBaseClassAtIndex(0, nullptr) // _Span_extent_type
.GetStaticFieldWithName("_Mysize"))
m_num_elements = field.GetConstantValue().ULongLong(0);
return lldb::ChildCacheState::eRefetch;
}
llvm::Expected<size_t>
lldb_private::formatters::MsvcStlSpanSyntheticFrontEnd::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;
}
bool IsMsvcStlSpan(ValueObject &valobj) {
if (auto valobj_sp = valobj.GetNonSyntheticValue())
return valobj_sp->GetChildMemberWithName("_Mydata") != nullptr;
return false;
}
lldb_private::SyntheticChildrenFrontEnd *
MsvcStlSpanSyntheticFrontEndCreator(CXXSyntheticChildren *,
lldb::ValueObjectSP valobj_sp) {
if (!valobj_sp)
return nullptr;
return new MsvcStlSpanSyntheticFrontEnd(valobj_sp);
}
} // namespace lldb_private::formatters
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