lldb/source/Plugins/SymbolFile/DWARF/DWARFAttribute.cpp

   1 //===-- DWARFAttribute.cpp ------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "DWARFAttribute.h"
  10 #include "DWARFUnit.h"
  11 #include "DWARFDebugInfo.h"
  12
  13 using namespace lldb_private::dwarf;
  14 using namespace lldb_private::plugin::dwarf;
  15
  16 DWARFAttributes::DWARFAttributes() : m_infos() {}
  17
  18 DWARFAttributes::~DWARFAttributes() = default;
  19
  20 uint32_t DWARFAttributes::FindAttributeIndex(dw_attr_t attr) const {
  21   collection::const_iterator end = m_infos.end();
  22   collection::const_iterator beg = m_infos.begin();
  23   collection::const_iterator pos;
  24   for (pos = beg; pos != end; ++pos) {
  25     if (pos->attr.get_attr() == attr)
  26       return std::distance(beg, pos);
  27   }
  28   return UINT32_MAX;
  29 }
  30
  31 void DWARFAttributes::Append(const DWARFFormValue &form_value,
  32                              dw_offset_t attr_die_offset, dw_attr_t attr) {
  33   AttributeValue attr_value = {const_cast<DWARFUnit *>(form_value.GetUnit()),
  34                                attr_die_offset,
  35                                {attr, form_value.Form(), form_value.Value()}};
  36   m_infos.push_back(attr_value);
  37 }
  38
  39 bool DWARFAttributes::ExtractFormValueAtIndex(
  40     uint32_t i, DWARFFormValue &form_value) const {
  41   const DWARFUnit *cu = CompileUnitAtIndex(i);
  42   form_value.SetUnit(cu);
  43   form_value.SetForm(FormAtIndex(i));
  44   if (form_value.Form() == DW_FORM_implicit_const) {
  45     form_value.SetValue(ValueAtIndex(i));
  46     return true;
  47   }
  48   lldb::offset_t offset = DIEOffsetAtIndex(i);
  49   return form_value.ExtractValue(cu->GetData(), &offset);
  50 }
  51
  52 DWARFDIE
  53 DWARFAttributes::FormValueAsReference(dw_attr_t attr) const {
  54   const uint32_t attr_idx = FindAttributeIndex(attr);
  55   if (attr_idx != UINT32_MAX)
  56     return FormValueAsReferenceAtIndex(attr_idx);
  57   return {};
  58 }
  59
  60 DWARFDIE
  61 DWARFAttributes::FormValueAsReferenceAtIndex(uint32_t i) const {
  62   DWARFFormValue form_value;
  63   if (ExtractFormValueAtIndex(i, form_value))
  64     return form_value.Reference();
  65   return {};
  66 }