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