LibCxxInitializerList.cpp
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//===-- LibCxxInitializerList.cpp -------------------------------*- C++ -*-===//
//
// 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 "lldb/Utility/ConstString.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
namespace lldb_private {
namespace formatters {
class LibcxxInitializerListSyntheticFrontEnd
: public SyntheticChildrenFrontEnd {
public:
LibcxxInitializerListSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
~LibcxxInitializerListSyntheticFrontEnd() override;
size_t CalculateNumChildren() override;
lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
bool Update() override;
bool MightHaveChildren() override;
size_t GetIndexOfChildWithName(ConstString name) override;
private:
ValueObject *m_start;
CompilerType m_element_type;
uint32_t m_element_size;
size_t m_num_elements;
};
} // namespace formatters
} // namespace lldb_private
lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
LibcxxInitializerListSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp), m_start(nullptr), m_element_type(),
m_element_size(0), m_num_elements(0) {
if (valobj_sp)
Update();
}
lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
~LibcxxInitializerListSyntheticFrontEnd() {
// this needs to stay around because it's a child object who will follow its
// parent's life cycle
// delete m_start;
}
size_t lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
CalculateNumChildren() {
static ConstString g___size_("__size_");
m_num_elements = 0;
ValueObjectSP size_sp(m_backend.GetChildMemberWithName(g___size_, true));
if (size_sp)
m_num_elements = size_sp->GetValueAsUnsigned(0);
return m_num_elements;
}
lldb::ValueObjectSP lldb_private::formatters::
LibcxxInitializerListSyntheticFrontEnd::GetChildAtIndex(size_t idx) {
if (!m_start)
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);
}
bool lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
Update() {
static ConstString g___begin_("__begin_");
m_start = nullptr;
m_num_elements = 0;
m_element_type = m_backend.GetCompilerType().GetTypeTemplateArgument(0);
if (!m_element_type.IsValid())
return false;
if (llvm::Optional<uint64_t> size = m_element_type.GetByteSize(nullptr)) {
m_element_size = *size;
// Store raw pointers or end up with a circular dependency.
m_start = m_backend.GetChildMemberWithName(g___begin_, true).get();
}
return false;
}
bool lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
MightHaveChildren() {
return true;
}
size_t lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
GetIndexOfChildWithName(ConstString name) {
if (!m_start)
return UINT32_MAX;
return ExtractIndexFromString(name.GetCString());
}
lldb_private::SyntheticChildrenFrontEnd *
lldb_private::formatters::LibcxxInitializerListSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
return (valobj_sp ? new LibcxxInitializerListSyntheticFrontEnd(valobj_sp)
: nullptr);
}