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//===-- MsvcStlDeque.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 "MsvcStl.h"
#include "lldb/DataFormatters/FormattersHelpers.h"
#include "lldb/DataFormatters/TypeSynthetic.h"
using namespace lldb;
namespace lldb_private {
namespace formatters {
class MsvcStlDequeSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
public:
MsvcStlDequeSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
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:
ValueObject *m_map = nullptr;
ExecutionContextRef m_exe_ctx_ref;
size_t m_block_size = 0;
size_t m_offset = 0;
size_t m_map_size = 0;
size_t m_element_size = 0;
CompilerType m_element_type;
uint32_t m_size = 0;
};
} // namespace formatters
} // namespace lldb_private
lldb_private::formatters::MsvcStlDequeSyntheticFrontEnd::
MsvcStlDequeSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp) {
if (valobj_sp)
Update();
}
llvm::Expected<uint32_t> lldb_private::formatters::
MsvcStlDequeSyntheticFrontEnd::CalculateNumChildren() {
if (!m_map)
return llvm::createStringError("Failed to read size");
return m_size;
}
lldb::ValueObjectSP
lldb_private::formatters::MsvcStlDequeSyntheticFrontEnd::GetChildAtIndex(
uint32_t idx) {
if (idx >= m_size || !m_map)
return nullptr;
ProcessSP process_sp(m_exe_ctx_ref.GetProcessSP());
if (!process_sp)
return nullptr;
// _EEN_DS = _Block_size
// _Map[(($i + _Myoff) / _EEN_DS) % _Mapsize][($i + _Myoff) % _EEN_DS]
size_t first_idx = ((idx + m_offset) / m_block_size) % m_map_size;
lldb::addr_t first_address = m_map->GetValueAsUnsigned(0) +
first_idx * process_sp->GetAddressByteSize();
Status err;
lldb::addr_t second_base =
process_sp->ReadPointerFromMemory(first_address, err);
if (err.Fail())
return nullptr;
size_t second_idx = (idx + m_offset) % m_block_size;
size_t second_address = second_base + second_idx * m_element_size;
StreamString name;
name.Printf("[%" PRIu64 "]", (uint64_t)idx);
return CreateValueObjectFromAddress(name.GetString(), second_address,
m_backend.GetExecutionContextRef(),
m_element_type);
}
lldb::ChildCacheState
lldb_private::formatters::MsvcStlDequeSyntheticFrontEnd::Update() {
m_size = 0;
m_map = nullptr;
m_element_type.Clear();
auto storage_sp = m_backend.GetChildAtNamePath({"_Mypair", "_Myval2"});
if (!storage_sp)
return lldb::eRefetch;
auto deque_type = m_backend.GetCompilerType();
if (!deque_type)
return lldb::eRefetch;
auto block_size_decl = deque_type.GetStaticFieldWithName("_Block_size");
if (!block_size_decl)
return lldb::eRefetch;
auto block_size = block_size_decl.GetConstantValue();
if (!block_size.IsValid())
return lldb::eRefetch;
auto element_type = deque_type.GetTypeTemplateArgument(0);
if (!element_type)
return lldb::eRefetch;
auto element_size = element_type.GetByteSize(nullptr);
if (!element_size)
return lldb::eRefetch;
auto offset_sp = storage_sp->GetChildMemberWithName("_Myoff");
auto map_size_sp = storage_sp->GetChildMemberWithName("_Mapsize");
auto map_sp = storage_sp->GetChildMemberWithName("_Map");
auto size_sp = storage_sp->GetChildMemberWithName("_Mysize");
if (!offset_sp || !map_size_sp || !map_sp || !size_sp)
return lldb::eRefetch;
bool ok = false;
uint64_t offset = offset_sp->GetValueAsUnsigned(0, &ok);
if (!ok)
return lldb::eRefetch;
uint64_t map_size = map_size_sp->GetValueAsUnsigned(0, &ok);
if (!ok)
return lldb::eRefetch;
uint64_t size = size_sp->GetValueAsUnsigned(0, &ok);
if (!ok)
return lldb::eRefetch;
m_map = map_sp.get();
m_exe_ctx_ref = m_backend.GetExecutionContextRef();
m_block_size = block_size.ULongLong();
m_offset = offset;
m_map_size = map_size;
m_element_size = *element_size;
m_element_type = element_type;
m_size = size;
return lldb::eRefetch;
}
llvm::Expected<size_t> lldb_private::formatters::MsvcStlDequeSyntheticFrontEnd::
GetIndexOfChildWithName(ConstString name) {
if (!m_map)
return llvm::createStringError("Type has no child named '%s'",
name.AsCString());
if (auto optional_idx = ExtractIndexFromString(name.GetCString()))
return *optional_idx;
return llvm::createStringError("Type has no child named '%s'",
name.AsCString());
}
bool lldb_private::formatters::IsMsvcStlDeque(ValueObject &valobj) {
if (auto valobj_sp = valobj.GetNonSyntheticValue())
return valobj_sp->GetChildMemberWithName("_Mypair") != nullptr;
return false;
}
lldb_private::SyntheticChildrenFrontEnd *
lldb_private::formatters::MsvcStlDequeSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
return new MsvcStlDequeSyntheticFrontEnd(valobj_sp);
}
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