1 //===-- DWARFDebugRanges.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 "DWARFDebugRanges.h" 10 #include "DWARFUnit.h" 11 #include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h" 12 13 using namespace lldb_private; 14 using namespace lldb_private::plugin::dwarf; 15 DWARFDebugRanges()16DWARFDebugRanges::DWARFDebugRanges() : m_range_map() {} 17 Extract(DWARFContext & context)18void DWARFDebugRanges::Extract(DWARFContext &context) { 19 llvm::DWARFDataExtractor extractor = 20 context.getOrLoadRangesData().GetAsLLVMDWARF(); 21 llvm::DWARFDebugRangeList extracted_list; 22 uint64_t current_offset = 0; 23 auto extract_next_list = [&] { 24 if (auto error = extracted_list.extract(extractor, ¤t_offset)) { 25 consumeError(std::move(error)); 26 return false; 27 } 28 return true; 29 }; 30 31 uint64_t previous_offset = current_offset; 32 while (extractor.isValidOffset(current_offset) && extract_next_list()) { 33 DWARFRangeList &lldb_range_list = m_range_map[previous_offset]; 34 lldb_range_list.Reserve(extracted_list.getEntries().size()); 35 for (auto &range : extracted_list.getEntries()) 36 lldb_range_list.Append(range.StartAddress, 37 range.EndAddress - range.StartAddress); 38 lldb_range_list.Sort(); 39 previous_offset = current_offset; 40 } 41 } 42 43 DWARFRangeList FindRanges(const DWARFUnit * cu,dw_offset_t debug_ranges_offset) const44DWARFDebugRanges::FindRanges(const DWARFUnit *cu, 45 dw_offset_t debug_ranges_offset) const { 46 dw_addr_t debug_ranges_address = cu->GetRangesBase() + debug_ranges_offset; 47 auto pos = m_range_map.find(debug_ranges_address); 48 DWARFRangeList ans = 49 pos == m_range_map.end() ? DWARFRangeList() : pos->second; 50 51 // All DW_AT_ranges are relative to the base address of the compile 52 // unit. We add the compile unit base address to make sure all the 53 // addresses are properly fixed up. 54 ans.Slide(cu->GetBaseAddress()); 55 return ans; 56 } 57