File indexing completed on 2024-05-19 05:44:07

 /*
     Copyright (C) 2015 Volker Krause <vkrause@kde.org>
 
     This program is free software; you can redistribute it and/or modify it
     under the terms of the GNU Library General Public License as published by
     the Free Software Foundation; either version 2 of the License, or (at your
     option) any later version.
 
     This program is distributed in the hope that it will be useful, but WITHOUT
     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
     License for more details.
 
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
 #include "dwarfaddressranges.h"
 #include "dwarfinfo.h"
 #include "dwarfcudie.h"
 
 #include <dwarf.h>
 
 #include <cassert>
 
 DwarfAddressRanges::DwarfAddressRanges(DwarfInfo* info) :
     m_aranges(nullptr),
     m_info(info)
 {
     assert(info);
     const auto res = dwarf_get_aranges(info->dwarfHandle(), &m_aranges, &m_arangesSize, nullptr);
     if (res != DW_DLV_OK)
         return;
 }
 
 DwarfAddressRanges::~DwarfAddressRanges()
 {
     for (int i = 0; i < m_arangesSize; ++i)
         dwarf_dealloc(m_info->dwarfHandle(), m_aranges[i], DW_DLA_ARANGE);
     dwarf_dealloc(m_info->dwarfHandle(), m_aranges, DW_DLA_LIST);
 }
 
 bool DwarfAddressRanges::isValid() const
 {
     return m_aranges;
 }
 
 DwarfCuDie* DwarfAddressRanges::compilationUnitForAddress(uint64_t addr) const
 {
     if (!isValid())
         return nullptr;
 
     Dwarf_Arange arange;
     auto res = dwarf_get_arange(m_aranges, m_arangesSize, addr, &arange, nullptr);
     if (res != DW_DLV_OK)
         return nullptr;
 
     Dwarf_Off offset;
     res = dwarf_get_cu_die_offset(arange, &offset, nullptr);
     if (res != DW_DLV_OK)
         return nullptr;
 
     auto die = m_info->dieAtOffset(offset);
     if (!die)
         return nullptr;
 
     assert(die->isCompilationUnit());
     return static_cast<DwarfCuDie*>(die);
 }
 
 static DwarfDie* findByLowPCRecursive(DwarfDie *die, uint64_t addr)
 {
     const auto lowPC = die->attribute(DW_AT_low_pc).toULongLong();
     if (lowPC == addr)
         return die;
 
     foreach (const auto child, die->children()) {
         auto res = findByLowPCRecursive(child, addr);
         if (res)
             return res;
     }
 
     return nullptr;
 }
 
 DwarfDie* DwarfAddressRanges::dieForAddress(uint64_t addr) const
 {
     const auto cu = compilationUnitForAddress(addr);
     if (!cu)
         return nullptr;
 
     foreach (const auto die, cu->children()) {
         auto res = findByLowPCRecursive(die, addr);
         if (res)
             return res;
     }
 
     return nullptr;
 }