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 "LogChannelDWARF.h" 12 #include "SymbolFileDWARFDebugMap.h" 13 14 #include "lldb/Symbol/CompileUnit.h" 15 #include "lldb/Symbol/LineTable.h" 16 #include "lldb/Utility/Stream.h" 17 #include "llvm/DebugInfo/DWARF/DWARFAddressRange.h" 18 19 using namespace lldb; 20 using namespace lldb_private; 21 using namespace lldb_private::plugin::dwarf; 22 23 void DWARFCompileUnit::Dump(Stream *s) const { 24 s->Format( 25 26 "{0:x16}: Compile Unit: length = {1:x8}, version = {2:x}, " 27 "abbr_offset = {3:x8}, addr_size = {4:x2} (next CU at " 28 "[{5:x16}])\n", 29 GetOffset(), GetLength(), GetVersion(), (uint32_t)GetAbbrevOffset(), 30 GetAddressByteSize(), GetNextUnitOffset()); 31 } 32 33 void DWARFCompileUnit::BuildAddressRangeTable( 34 DWARFDebugAranges *debug_aranges) { 35 // This function is usually called if there in no .debug_aranges section in 36 // order to produce a compile unit level set of address ranges that is 37 // accurate. 38 39 size_t num_debug_aranges = debug_aranges->GetNumRanges(); 40 41 // First get the compile unit DIE only and check contains ranges information. 42 const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly(); 43 44 const dw_offset_t cu_offset = GetOffset(); 45 if (die) { 46 llvm::Expected<llvm::DWARFAddressRangesVector> ranges = 47 die->GetAttributeAddressRanges(this, /*check_hi_lo_pc=*/true); 48 if (ranges) { 49 for (const llvm::DWARFAddressRange &range : *ranges) 50 debug_aranges->AppendRange(cu_offset, range.LowPC, range.HighPC); 51 if (!ranges->empty()) 52 return; 53 } else { 54 LLDB_LOG_ERROR(GetLog(DWARFLog::DebugInfo), ranges.takeError(), 55 "{1:x}: {0}", cu_offset); 56 } 57 } 58 59 if (debug_aranges->GetNumRanges() == num_debug_aranges) { 60 // We got nothing from the debug info, try to build the arange table from 61 // the debug map OSO aranges. 62 SymbolContext sc; 63 sc.comp_unit = m_dwarf.GetCompUnitForDWARFCompUnit(*this); 64 if (sc.comp_unit) { 65 SymbolFileDWARFDebugMap *debug_map_sym_file = 66 m_dwarf.GetDebugMapSymfile(); 67 if (debug_map_sym_file) { 68 auto *cu_info = 69 debug_map_sym_file->GetCompileUnitInfo(&GetSymbolFileDWARF()); 70 // If there are extra compile units the OSO entries aren't a reliable 71 // source of information. 72 if (cu_info->compile_units_sps.empty()) 73 debug_map_sym_file->AddOSOARanges(&m_dwarf, debug_aranges); 74 } 75 } 76 } 77 78 if (debug_aranges->GetNumRanges() == num_debug_aranges) { 79 // We got nothing from the functions, maybe we have a line tables only 80 // situation. Check the line tables and build the arange table from this. 81 SymbolContext sc; 82 sc.comp_unit = m_dwarf.GetCompUnitForDWARFCompUnit(*this); 83 if (sc.comp_unit) { 84 if (LineTable *line_table = sc.comp_unit->GetLineTable()) { 85 LineTable::FileAddressRanges file_ranges; 86 const bool append = true; 87 const size_t num_ranges = 88 line_table->GetContiguousFileAddressRanges(file_ranges, append); 89 for (uint32_t idx = 0; idx < num_ranges; ++idx) { 90 const LineTable::FileAddressRanges::Entry &range = 91 file_ranges.GetEntryRef(idx); 92 debug_aranges->AppendRange(GetOffset(), range.GetRangeBase(), 93 range.GetRangeEnd()); 94 } 95 } 96 } 97 } 98 } 99 100 DWARFCompileUnit &DWARFCompileUnit::GetNonSkeletonUnit() { 101 return llvm::cast<DWARFCompileUnit>(DWARFUnit::GetNonSkeletonUnit()); 102 } 103 104 DWARFDIE DWARFCompileUnit::LookupAddress(const dw_addr_t address) { 105 if (DIE()) { 106 const DWARFDebugAranges &func_aranges = GetFunctionAranges(); 107 108 // Re-check the aranges auto pointer contents in case it was created above 109 if (!func_aranges.IsEmpty()) 110 return GetDIE(func_aranges.FindAddress(address)); 111 } 112 return DWARFDIE(); 113 } 114