third_party/llvm-project/lldb/source/Plugins/SymbolFile/DWARF/DWARFAbbreviationDeclaration.cpp

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

#include "DWARFAbbreviationDeclaration.h"

#include "lldb/Core/dwarf.h"
#include "lldb/Utility/Stream.h"

#include "DWARFFormValue.h"

using namespace lldb_private;

DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration()
    : m_code(InvalidCode), m_tag(0), m_has_children(0), m_attributes() {}

DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration(dw_tag_t tag,
                                                           uint8_t has_children)
    : m_code(InvalidCode), m_tag(tag), m_has_children(has_children),
      m_attributes() {}

bool DWARFAbbreviationDeclaration::Extract(const DWARFDataExtractor &data,
                                           lldb::offset_t *offset_ptr) {
  return Extract(data, offset_ptr, data.GetULEB128(offset_ptr));
}

bool DWARFAbbreviationDeclaration::Extract(const DWARFDataExtractor &data,
                                           lldb::offset_t *offset_ptr,
                                           dw_uleb128_t code) {
  m_code = code;
  m_attributes.clear();
  if (m_code) {
    m_tag = data.GetULEB128(offset_ptr);
    m_has_children = data.GetU8(offset_ptr);

    while (data.ValidOffset(*offset_ptr)) {
      dw_attr_t attr = data.GetULEB128(offset_ptr);
      dw_form_t form = data.GetULEB128(offset_ptr);

      if (attr && form)
        m_attributes.push_back(DWARFAttribute(attr, form));
      else
        break;
    }

    return m_tag != 0;
  } else {
    m_tag = 0;
    m_has_children = 0;
  }

  return false;
}

void DWARFAbbreviationDeclaration::Dump(Stream *s) const {
  s->Printf("Debug Abbreviation Declaration: code = 0x%4.4x, tag = %s, "
            "has_children = %s\n",
            m_code, DW_TAG_value_to_name(m_tag),
            DW_CHILDREN_value_to_name(m_has_children));

  DWARFAttribute::const_iterator pos;

  for (pos = m_attributes.begin(); pos != m_attributes.end(); ++pos)
    s->Printf("        attr = %s, form = %s\n",
              DW_AT_value_to_name(pos->get_attr()),
              DW_FORM_value_to_name(pos->get_form()));

  s->Printf("\n");
}

bool DWARFAbbreviationDeclaration::IsValid() {
  return m_code != 0 && m_tag != 0;
}

uint32_t
DWARFAbbreviationDeclaration::FindAttributeIndex(dw_attr_t attr) const {
  uint32_t i;
  const uint32_t kNumAttributes = m_attributes.size();
  for (i = 0; i < kNumAttributes; ++i) {
    if (m_attributes[i].get_attr() == attr)
      return i;
  }
  return DW_INVALID_INDEX;
}

bool DWARFAbbreviationDeclaration::
operator==(const DWARFAbbreviationDeclaration &rhs) const {
  return Tag() == rhs.Tag() && HasChildren() == rhs.HasChildren() &&
         Attributes() == rhs.Attributes();
}