//===-- DWARFAttribute.cpp --------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "DWARFAttribute.h"
#include "DWARFDebugInfo.h"
#include "DWARFCompileUnit.h"

DWARFAttributes::DWARFAttributes() :
    m_infos()
{
}

DWARFAttributes::~DWARFAttributes()
{
}


uint32_t
DWARFAttributes::FindAttributeIndex(dw_attr_t attr) const
{
    collection::const_iterator end = m_infos.end();
    collection::const_iterator beg = m_infos.begin();
    collection::const_iterator pos;
    for (pos = beg; pos != end; ++pos)
    {
        if (pos->attr.get_attr() == attr)
            return std::distance(beg, pos);
    }
    return UINT32_MAX;
}

void
DWARFAttributes::Append(const DWARFCompileUnit *cu, dw_offset_t attr_die_offset, dw_attr_t attr, dw_form_t form)
{
    AttributeValue attr_value = { cu, attr_die_offset, { attr, form } };
    m_infos.push_back(attr_value);
}

bool
DWARFAttributes::ContainsAttribute(dw_attr_t attr) const
{
    return FindAttributeIndex(attr) != UINT32_MAX;
}

bool
DWARFAttributes::RemoveAttribute(dw_attr_t attr)
{
    uint32_t attr_index = FindAttributeIndex(attr);
    if (attr_index != UINT32_MAX)
    {
        m_infos.erase(m_infos.begin() + attr_index);
        return true;
    }
    return false;
}

bool
DWARFAttributes::ExtractFormValueAtIndex (uint32_t i, DWARFFormValue &form_value) const
{
    const DWARFCompileUnit *cu = CompileUnitAtIndex(i);
    form_value.SetCompileUnit(cu);
    form_value.SetForm(FormAtIndex(i));
    lldb::offset_t offset = DIEOffsetAtIndex(i);
    return form_value.ExtractValue(cu->GetSymbolFileDWARF()->get_debug_info_data(), &offset);
}

uint64_t
DWARFAttributes::FormValueAsUnsigned (dw_attr_t attr, uint64_t fail_value) const
{
    const uint32_t attr_idx = FindAttributeIndex (attr);
    if (attr_idx != UINT32_MAX)
        return FormValueAsUnsignedAtIndex (attr_idx, fail_value);
    return fail_value;
}

uint64_t
DWARFAttributes::FormValueAsUnsignedAtIndex(uint32_t i, uint64_t fail_value) const
{
    DWARFFormValue form_value;
    if (ExtractFormValueAtIndex(i, form_value))
        return form_value.Reference();
    return fail_value;
}