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 } 67