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//===-- LibCxxVector.cpp -----------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/lldb-python.h"
#include "lldb/DataFormatters/CXXFormatterFunctions.h"
#include "lldb/Core/ConstString.h"
#include "lldb/Core/ValueObject.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
namespace lldb_private {
namespace formatters {
class LibcxxStdVectorSyntheticFrontEnd : public SyntheticChildrenFrontEnd
{
public:
LibcxxStdVectorSyntheticFrontEnd (lldb::ValueObjectSP valobj_sp);
virtual size_t
CalculateNumChildren ();
virtual lldb::ValueObjectSP
GetChildAtIndex (size_t idx);
virtual bool
Update();
virtual bool
MightHaveChildren ();
virtual size_t
GetIndexOfChildWithName (const ConstString &name);
virtual
~LibcxxStdVectorSyntheticFrontEnd ();
private:
ValueObject* m_start;
ValueObject* m_finish;
ClangASTType m_element_type;
uint32_t m_element_size;
std::map<size_t,lldb::ValueObjectSP> m_children;
};
}
}
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::LibcxxStdVectorSyntheticFrontEnd (lldb::ValueObjectSP valobj_sp) :
SyntheticChildrenFrontEnd(*valobj_sp.get()),
m_start(NULL),
m_finish(NULL),
m_element_type(),
m_element_size(0),
m_children()
{
if (valobj_sp)
Update();
}
size_t
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::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)
return 0;
return num_children/m_element_size;
}
lldb::ValueObjectSP
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::GetChildAtIndex (size_t idx)
{
if (!m_start || !m_finish)
return lldb::ValueObjectSP();
auto cached = m_children.find(idx);
if (cached != m_children.end())
return cached->second;
uint64_t offset = idx * m_element_size;
offset = offset + m_start->GetValueAsUnsigned(0);
StreamString name;
name.Printf("[%" PRIu64 "]", (uint64_t)idx);
ValueObjectSP child_sp = CreateValueObjectFromAddress(name.GetData(), offset, m_backend.GetExecutionContextRef(), m_element_type);
m_children[idx] = child_sp;
return child_sp;
}
bool
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::Update()
{
m_start = m_finish = NULL;
m_children.clear();
ValueObjectSP data_type_finder_sp(m_backend.GetChildMemberWithName(ConstString("__end_cap_"),true));
if (!data_type_finder_sp)
return false;
data_type_finder_sp = data_type_finder_sp->GetChildMemberWithName(ConstString("__first_"),true);
if (!data_type_finder_sp)
return false;
m_element_type = data_type_finder_sp->GetClangType().GetPointeeType();
m_element_size = m_element_type.GetByteSize(nullptr);
if (m_element_size > 0)
{
// store raw pointers or end up with a circular dependency
m_start = m_backend.GetChildMemberWithName(ConstString("__begin_"),true).get();
m_finish = m_backend.GetChildMemberWithName(ConstString("__end_"),true).get();
}
return false;
}
bool
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::MightHaveChildren ()
{
return true;
}
size_t
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::GetIndexOfChildWithName (const ConstString &name)
{
if (!m_start || !m_finish)
return UINT32_MAX;
return ExtractIndexFromString(name.GetCString());
}
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::~LibcxxStdVectorSyntheticFrontEnd ()
{
// these need to stay around because they are child objects who will follow their parent's life cycle
// delete m_start;
// delete m_finish;
}
lldb_private::SyntheticChildrenFrontEnd*
lldb_private::formatters::LibcxxStdVectorSyntheticFrontEndCreator (CXXSyntheticChildren*, lldb::ValueObjectSP valobj_sp)
{
if (!valobj_sp)
return NULL;
return (new LibcxxStdVectorSyntheticFrontEnd(valobj_sp));
}
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