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->Printf("0x%8.8x: Compile Unit: length = 0x%8.8x, version = 0x%4.4x, " 22 "abbr_offset = 0x%8.8x, addr_size = 0x%2.2x (next CU at " 23 "{0x%8.8x})\n", 24 GetOffset(), GetLength(), GetVersion(), GetAbbrevOffset(), 25 GetAddressByteSize(), GetNextUnitOffset()); 26 } 27 28 void DWARFCompileUnit::BuildAddressRangeTable( 29 DWARFDebugAranges *debug_aranges) { 30 // This function is usually called if there in no .debug_aranges section in 31 // order to produce a compile unit level set of address ranges that is 32 // accurate. 33 34 size_t num_debug_aranges = debug_aranges->GetNumRanges(); 35 36 // First get the compile unit DIE only and check contains ranges information. 37 const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly(); 38 39 const dw_offset_t cu_offset = GetOffset(); 40 if (die) { 41 DWARFRangeList ranges; 42 const size_t num_ranges = 43 die->GetAttributeAddressRanges(this, ranges, /*check_hi_lo_pc=*/true); 44 if (num_ranges > 0) { 45 for (size_t i = 0; i < num_ranges; ++i) { 46 const DWARFRangeList::Entry &range = ranges.GetEntryRef(i); 47 debug_aranges->AppendRange(cu_offset, range.GetRangeBase(), 48 range.GetRangeEnd()); 49 } 50 51 return; 52 } 53 } 54 55 if (debug_aranges->GetNumRanges() == num_debug_aranges) { 56 // We got nothing from the debug info, maybe we have a line tables only 57 // situation. Check the line tables and build the arange table from this. 58 SymbolContext sc; 59 sc.comp_unit = m_dwarf.GetCompUnitForDWARFCompUnit(*this); 60 if (sc.comp_unit) { 61 SymbolFileDWARFDebugMap *debug_map_sym_file = 62 m_dwarf.GetDebugMapSymfile(); 63 if (debug_map_sym_file == nullptr) { 64 if (LineTable *line_table = sc.comp_unit->GetLineTable()) { 65 LineTable::FileAddressRanges file_ranges; 66 const bool append = true; 67 const size_t num_ranges = 68 line_table->GetContiguousFileAddressRanges(file_ranges, append); 69 for (uint32_t idx = 0; idx < num_ranges; ++idx) { 70 const LineTable::FileAddressRanges::Entry &range = 71 file_ranges.GetEntryRef(idx); 72 debug_aranges->AppendRange(cu_offset, range.GetRangeBase(), 73 range.GetRangeEnd()); 74 } 75 } 76 } else 77 debug_map_sym_file->AddOSOARanges(&m_dwarf, debug_aranges); 78 } 79 } 80 81 if (debug_aranges->GetNumRanges() == num_debug_aranges) { 82 // We got nothing from the functions, maybe we have a line tables only 83 // situation. Check the line tables and build the arange table from this. 84 SymbolContext sc; 85 sc.comp_unit = m_dwarf.GetCompUnitForDWARFCompUnit(*this); 86 if (sc.comp_unit) { 87 if (LineTable *line_table = sc.comp_unit->GetLineTable()) { 88 LineTable::FileAddressRanges file_ranges; 89 const bool append = true; 90 const size_t num_ranges = 91 line_table->GetContiguousFileAddressRanges(file_ranges, append); 92 for (uint32_t idx = 0; idx < num_ranges; ++idx) { 93 const LineTable::FileAddressRanges::Entry &range = 94 file_ranges.GetEntryRef(idx); 95 debug_aranges->AppendRange(GetOffset(), range.GetRangeBase(), 96 range.GetRangeEnd()); 97 } 98 } 99 } 100 } 101 } 102 103 DWARFCompileUnit &DWARFCompileUnit::GetNonSkeletonUnit() { 104 return llvm::cast<DWARFCompileUnit>(DWARFUnit::GetNonSkeletonUnit()); 105 } 106 107 DWARFDIE DWARFCompileUnit::LookupAddress(const dw_addr_t address) { 108 if (DIE()) { 109 const DWARFDebugAranges &func_aranges = GetFunctionAranges(); 110 111 // Re-check the aranges auto pointer contents in case it was created above 112 if (!func_aranges.IsEmpty()) 113 return GetDIE(func_aranges.FindAddress(address)); 114 } 115 return DWARFDIE(); 116 } 117