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//===-- GenericInitializerList.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 "lldb/DataFormatters/FormattersHelpers.h"
#include "lldb/Utility/ConstString.h"
#include "lldb/ValueObject/ValueObject.h"
#include <cstddef>
#include <optional>
#include <type_traits>
using namespace lldb;
using namespace lldb_private;
namespace generic_check {
template <class T>
using size_func = decltype(T::GetSizeMember(std::declval<ValueObject &>()));
template <class T>
using start_func = decltype(T::GetStartMember(std::declval<ValueObject &>()));
namespace {
template <typename...> struct check_func : std::true_type {};
} // namespace
template <typename T>
using has_functions = check_func<size_func<T>, start_func<T>>;
} // namespace generic_check
struct LibCxx {
static ValueObjectSP GetStartMember(ValueObject &backend) {
return backend.GetChildMemberWithName("__begin_");
}
static ValueObjectSP GetSizeMember(ValueObject &backend) {
return backend.GetChildMemberWithName("__size_");
}
};
struct LibStdcpp {
static ValueObjectSP GetStartMember(ValueObject &backend) {
return backend.GetChildMemberWithName("_M_array");
}
static ValueObjectSP GetSizeMember(ValueObject &backend) {
return backend.GetChildMemberWithName("_M_len");
}
};
namespace lldb_private::formatters {
template <class StandardImpl>
class GenericInitializerListSyntheticFrontEnd
: public SyntheticChildrenFrontEnd {
public:
static_assert(generic_check::has_functions<StandardImpl>::value,
"Missing Required Functions.");
GenericInitializerListSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp), m_element_type() {
if (valobj_sp)
Update();
}
~GenericInitializerListSyntheticFrontEnd() override {
// this needs to stay around because it's a child object who will follow its
// parent's life cycle
// delete m_start;
}
llvm::Expected<uint32_t> CalculateNumChildren() override {
m_num_elements = 0;
const ValueObjectSP size_sp(StandardImpl::GetSizeMember(m_backend));
if (size_sp)
m_num_elements = size_sp->GetValueAsUnsigned(0);
return m_num_elements;
}
lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override {
if (!m_start)
return {};
uint64_t offset = static_cast<uint64_t>(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 Update() override {
m_start = nullptr;
m_num_elements = 0;
m_element_type = m_backend.GetCompilerType().GetTypeTemplateArgument(0);
if (!m_element_type.IsValid())
return lldb::ChildCacheState::eRefetch;
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}");
else {
m_element_size = *size_or_err;
// Store raw pointers or end up with a circular dependency.
m_start = StandardImpl::GetStartMember(m_backend).get();
}
return lldb::ChildCacheState::eRefetch;
}
llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override {
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;
}
private:
ValueObject *m_start = nullptr;
CompilerType m_element_type;
uint32_t m_element_size = 0;
size_t m_num_elements = 0;
};
SyntheticChildrenFrontEnd *GenericInitializerListSyntheticFrontEndCreator(
CXXSyntheticChildren * /*unused*/, lldb::ValueObjectSP valobj_sp) {
if (!valobj_sp)
return nullptr;
if (LibCxx::GetStartMember(*valobj_sp) != nullptr)
return new GenericInitializerListSyntheticFrontEnd<LibCxx>(valobj_sp);
return new GenericInitializerListSyntheticFrontEnd<LibStdcpp>(valobj_sp);
}
} // namespace lldb_private::formatters
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