text: //===-- 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 "DWARFCompileUnit.h"
  #include "DWARFDebugInfo.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;
  }
  