1 //===-- DWARFCompileUnit.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 "DWARFCompileUnit.h" 10 #include "DWARFDebugAranges.h" 11 #include "SymbolFileDWARFDebugMap.h" 12 13 #include "lldb/Symbol/CompileUnit.h" 14 #include "lldb/Symbol/LineTable.h" 15 #include "lldb/Utility/Stream.h" 16 17 using namespace lldb; 18 using namespace lldb_private; 19 using namespace lldb_private::plugin::dwarf; 20 21 void DWARFCompileUnit::Dump(Stream *s) const { 22 s->Format( 23 24 "{0:x16}: Compile Unit: length = {1:x8}, version = {2:x}, " 25 "abbr_offset = {3:x8}, addr_size = {4:x2} (next CU at " 26 "[{5:x16}])\n", 27 GetOffset(), GetLength(), GetVersion(), (uint32_t)GetAbbrevOffset(), 28 GetAddressByteSize(), GetNextUnitOffset()); 29 } 30 31 void DWARFCompileUnit::BuildAddressRangeTable( 32 DWARFDebugAranges *debug_aranges) { 33 // This function is usually called if there in no .debug_aranges section in 34 // order to produce a compile unit level set of address ranges that is 35 // accurate. 36 37 size_t num_debug_aranges = debug_aranges->GetNumRanges(); 38 39 // First get the compile unit DIE only and check contains ranges information. 40 const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly(); 41 42 const dw_offset_t cu_offset = GetOffset(); 43 if (die) { 44 DWARFRangeList ranges = 45 die->GetAttributeAddressRanges(this, /*check_hi_lo_pc=*/true); 46 for (const DWARFRangeList::Entry &range : ranges) 47 debug_aranges->AppendRange(cu_offset, range.GetRangeBase(), 48 range.GetRangeEnd()); 49 50 if (!ranges.IsEmpty()) 51 return; 52 } 53 54 if (debug_aranges->GetNumRanges() == num_debug_aranges) { 55 // We got nothing from the debug info, try to build the arange table from 56 // the debug map OSO aranges. 57 SymbolContext sc; 58 sc.comp_unit = m_dwarf.GetCompUnitForDWARFCompUnit(*this); 59 if (sc.comp_unit) { 60 SymbolFileDWARFDebugMap *debug_map_sym_file = 61 m_dwarf.GetDebugMapSymfile(); 62 if (debug_map_sym_file) { 63 auto *cu_info = 64 debug_map_sym_file->GetCompileUnitInfo(&GetSymbolFileDWARF()); 65 // If there are extra compile units the OSO entries aren't a reliable 66 // source of information. 67 if (cu_info->compile_units_sps.empty()) 68 debug_map_sym_file->AddOSOARanges(&m_dwarf, debug_aranges); 69 } 70 } 71 } 72 73 if (debug_aranges->GetNumRanges() == num_debug_aranges) { 74 // We got nothing from the functions, maybe we have a line tables only 75 // situation. Check the line tables and build the arange table from this. 76 SymbolContext sc; 77 sc.comp_unit = m_dwarf.GetCompUnitForDWARFCompUnit(*this); 78 if (sc.comp_unit) { 79 if (LineTable *line_table = sc.comp_unit->GetLineTable()) { 80 LineTable::FileAddressRanges file_ranges; 81 const bool append = true; 82 const size_t num_ranges = 83 line_table->GetContiguousFileAddressRanges(file_ranges, append); 84 for (uint32_t idx = 0; idx < num_ranges; ++idx) { 85 const LineTable::FileAddressRanges::Entry &range = 86 file_ranges.GetEntryRef(idx); 87 debug_aranges->AppendRange(GetOffset(), range.GetRangeBase(), 88 range.GetRangeEnd()); 89 } 90 } 91 } 92 } 93 } 94 95 DWARFCompileUnit &DWARFCompileUnit::GetNonSkeletonUnit() { 96 return llvm::cast<DWARFCompileUnit>(DWARFUnit::GetNonSkeletonUnit()); 97 } 98 99 DWARFDIE DWARFCompileUnit::LookupAddress(const dw_addr_t address) { 100 if (DIE()) { 101 const DWARFDebugAranges &func_aranges = GetFunctionAranges(); 102 103 // Re-check the aranges auto pointer contents in case it was created above 104 if (!func_aranges.IsEmpty()) 105 return GetDIE(func_aranges.FindAddress(address)); 106 } 107 return DWARFDIE(); 108 } 109