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 15 DWARFAttributes::DWARFAttributes() : m_infos() {} 16 17 DWARFAttributes::~DWARFAttributes() = default; 18 19 uint32_t DWARFAttributes::FindAttributeIndex(dw_attr_t attr) const { 20 collection::const_iterator end = m_infos.end(); 21 collection::const_iterator beg = m_infos.begin(); 22 collection::const_iterator pos; 23 for (pos = beg; pos != end; ++pos) { 24 if (pos->attr.get_attr() == attr) 25 return std::distance(beg, pos); 26 } 27 return UINT32_MAX; 28 } 29 30 void DWARFAttributes::Append(const DWARFFormValue &form_value, 31 dw_offset_t attr_die_offset, dw_attr_t attr) { 32 AttributeValue attr_value = {const_cast<DWARFUnit *>(form_value.GetUnit()), 33 attr_die_offset, 34 {attr, form_value.Form(), form_value.Value()}}; 35 m_infos.push_back(attr_value); 36 } 37 38 bool DWARFAttributes::ExtractFormValueAtIndex( 39 uint32_t i, DWARFFormValue &form_value) const { 40 const DWARFUnit *cu = CompileUnitAtIndex(i); 41 form_value.SetUnit(cu); 42 form_value.SetForm(FormAtIndex(i)); 43 if (form_value.Form() == DW_FORM_implicit_const) { 44 form_value.SetValue(ValueAtIndex(i)); 45 return true; 46 } 47 lldb::offset_t offset = DIEOffsetAtIndex(i); 48 return form_value.ExtractValue(cu->GetData(), &offset); 49 } 50 51 DWARFDIE 52 DWARFAttributes::FormValueAsReference(dw_attr_t attr) const { 53 const uint32_t attr_idx = FindAttributeIndex(attr); 54 if (attr_idx != UINT32_MAX) 55 return FormValueAsReferenceAtIndex(attr_idx); 56 return {}; 57 } 58 59 DWARFDIE 60 DWARFAttributes::FormValueAsReferenceAtIndex(uint32_t i) const { 61 DWARFFormValue form_value; 62 if (ExtractFormValueAtIndex(i, form_value)) 63 return form_value.Reference(); 64 return {}; 65 } 66