114 lines · cpp
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-exception6//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 19using namespace lldb;20using namespace lldb_private;21using namespace lldb_private::plugin::dwarf;22 23void 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 33void DWARFCompileUnit::BuildAddressRangeTable(34 DWARFDebugAranges *debug_aranges) {35 // This function is usually called if there in no .debug_aranges section in36 // order to produce a compile unit level set of address ranges that is37 // 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 from61 // 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 reliable71 // 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 only80 // 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 100DWARFCompileUnit &DWARFCompileUnit::GetNonSkeletonUnit() {101 return llvm::cast<DWARFCompileUnit>(DWARFUnit::GetNonSkeletonUnit());102}103 104DWARFDIE 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 above109 if (!func_aranges.IsEmpty())110 return GetDIE(func_aranges.FindAddress(address));111 }112 return DWARFDIE();113}114