LCOV - code coverage report
Current view: top level - lib/DebugInfo/DWARF - DWARFDie.cpp (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 273 282 96.8 %
Date: 2018-06-17 00:07:59 Functions: 31 32 96.9 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===- DWARFDie.cpp -------------------------------------------------------===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : 
      10             : #include "llvm/DebugInfo/DWARF/DWARFDie.h"
      11             : #include "llvm/ADT/None.h"
      12             : #include "llvm/ADT/Optional.h"
      13             : #include "llvm/ADT/SmallSet.h"
      14             : #include "llvm/ADT/StringRef.h"
      15             : #include "llvm/BinaryFormat/Dwarf.h"
      16             : #include "llvm/DebugInfo/DWARF/DWARFAbbreviationDeclaration.h"
      17             : #include "llvm/DebugInfo/DWARF/DWARFContext.h"
      18             : #include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
      19             : #include "llvm/DebugInfo/DWARF/DWARFExpression.h"
      20             : #include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
      21             : #include "llvm/DebugInfo/DWARF/DWARFUnit.h"
      22             : #include "llvm/Object/ObjectFile.h"
      23             : #include "llvm/Support/DataExtractor.h"
      24             : #include "llvm/Support/Format.h"
      25             : #include "llvm/Support/FormatVariadic.h"
      26             : #include "llvm/Support/MathExtras.h"
      27             : #include "llvm/Support/WithColor.h"
      28             : #include "llvm/Support/raw_ostream.h"
      29             : #include <algorithm>
      30             : #include <cassert>
      31             : #include <cinttypes>
      32             : #include <cstdint>
      33             : #include <string>
      34             : #include <utility>
      35             : 
      36             : using namespace llvm;
      37             : using namespace dwarf;
      38             : using namespace object;
      39             : 
      40          25 : static void dumpApplePropertyAttribute(raw_ostream &OS, uint64_t Val) {
      41          25 :   OS << " (";
      42             :   do {
      43             :     uint64_t Shift = countTrailingZeros(Val);
      44             :     assert(Shift < 64 && "undefined behavior");
      45          98 :     uint64_t Bit = 1ULL << Shift;
      46          98 :     auto PropName = ApplePropertyString(Bit);
      47          98 :     if (!PropName.empty())
      48          98 :       OS << PropName;
      49             :     else
      50           0 :       OS << format("DW_APPLE_PROPERTY_0x%" PRIx64, Bit);
      51          98 :     if (!(Val ^= Bit))
      52             :       break;
      53          73 :     OS << ", ";
      54             :   } while (true);
      55          25 :   OS << ")";
      56          25 : }
      57             : 
      58          48 : static void dumpRanges(const DWARFObject &Obj, raw_ostream &OS,
      59             :                        const DWARFAddressRangesVector &Ranges,
      60             :                        unsigned AddressSize, unsigned Indent,
      61             :                        const DIDumpOptions &DumpOpts) {
      62             :   ArrayRef<SectionName> SectionNames;
      63          48 :   if (DumpOpts.Verbose)
      64          30 :     SectionNames = Obj.getSectionNames();
      65             : 
      66          48 :   for (const DWARFAddressRange &R : Ranges) {
      67             : 
      68             :     OS << '\n';
      69         113 :     OS.indent(Indent);
      70         226 :     R.dump(OS, AddressSize);
      71             : 
      72         183 :     if (SectionNames.empty() || R.SectionIndex == -1ULL)
      73          70 :       continue;
      74             : 
      75          43 :     StringRef Name = SectionNames[R.SectionIndex].Name;
      76          43 :     OS << " \"" << Name << '\"';
      77             : 
      78             :     // Print section index if name is not unique.
      79          86 :     if (!SectionNames[R.SectionIndex].IsNameUnique)
      80           2 :       OS << format(" [%" PRIu64 "]", R.SectionIndex);
      81             :   }
      82          48 : }
      83             : 
      84        2232 : static void dumpLocation(raw_ostream &OS, DWARFFormValue &FormValue,
      85             :                          DWARFUnit *U, unsigned Indent,
      86             :                          DIDumpOptions DumpOpts) {
      87        2232 :   DWARFContext &Ctx = U->getContext();
      88             :   const DWARFObject &Obj = Ctx.getDWARFObj();
      89             :   const MCRegisterInfo *MRI = Ctx.getRegisterInfo();
      90        3686 :   if (FormValue.isFormClass(DWARFFormValue::FC_Block) ||
      91        1454 :       FormValue.isFormClass(DWARFFormValue::FC_Exprloc)) {
      92        1843 :     ArrayRef<uint8_t> Expr = *FormValue.getAsBlock();
      93             :     DataExtractor Data(StringRef((const char *)Expr.data(), Expr.size()),
      94             :                        Ctx.isLittleEndian(), 0);
      95        1843 :     DWARFExpression(Data, U->getVersion(), U->getAddressByteSize())
      96        1843 :         .print(OS, MRI);
      97             :     return;
      98             :   }
      99             : 
     100         389 :   FormValue.dump(OS, DumpOpts);
     101         389 :   if (FormValue.isFormClass(DWARFFormValue::FC_SectionOffset)) {
     102         163 :     const DWARFSection &LocSection = Obj.getLocSection();
     103         163 :     const DWARFSection &LocDWOSection = Obj.getLocDWOSection();
     104         163 :     uint32_t Offset = *FormValue.getAsSectionOffset();
     105         163 :     if (!LocSection.Data.empty()) {
     106             :       DWARFDebugLoc DebugLoc;
     107             :       DWARFDataExtractor Data(Obj, LocSection, Ctx.isLittleEndian(),
     108         158 :                               Obj.getAddressSize());
     109         158 :       auto LL = DebugLoc.parseOneLocationList(Data, &Offset);
     110         158 :       if (LL) {
     111             :         uint64_t BaseAddr = 0;
     112         158 :         if (Optional<BaseAddress> BA = U->getBaseAddress())
     113         157 :           BaseAddr = BA->Address;
     114         316 :         LL->dump(OS, Ctx.isLittleEndian(), Obj.getAddressSize(), MRI, BaseAddr,
     115             :                  Indent);
     116             :       } else
     117           0 :         OS << "error extracting location list.";
     118           5 :     } else if (!LocDWOSection.Data.empty()) {
     119             :       DataExtractor Data(LocDWOSection.Data, Ctx.isLittleEndian(), 0);
     120           5 :       auto LL = DWARFDebugLocDWO::parseOneLocationList(Data, &Offset);
     121           5 :       if (LL)
     122          10 :         LL->dump(OS, Ctx.isLittleEndian(), Obj.getAddressSize(), MRI, Indent);
     123             :       else
     124           0 :         OS << "error extracting location list.";
     125             :     }
     126             :   }
     127             : }
     128             : 
     129             : /// Dump the name encoded in the type tag.
     130         299 : static void dumpTypeTagName(raw_ostream &OS, dwarf::Tag T) {
     131         299 :   StringRef TagStr = TagString(T);
     132             :   if (!TagStr.startswith("DW_TAG_") || !TagStr.endswith("_type"))
     133           0 :     return;
     134         598 :   OS << TagStr.substr(7, TagStr.size() - 12) << " ";
     135             : }
     136             : 
     137             : /// Recursively dump the DIE type name when applicable.
     138        3787 : static void dumpTypeName(raw_ostream &OS, const DWARFDie &Die) {
     139        3787 :   DWARFDie D = Die.getAttributeValueAsReferencedDie(DW_AT_type);
     140             : 
     141             :   if (!D.isValid())
     142        2854 :     return;
     143             : 
     144        3666 :   if (const char *Name = D.getName(DINameKind::LinkageName)) {
     145        2733 :     OS << Name;
     146        2733 :     return;
     147             :   }
     148             : 
     149             :   // FIXME: We should have pretty printers per language. Currently we print
     150             :   // everything as if it was C++ and fall back to the TAG type name.
     151             :   const dwarf::Tag T = D.getTag();
     152         933 :   switch (T) {
     153             :   case DW_TAG_array_type:
     154             :   case DW_TAG_pointer_type:
     155             :   case DW_TAG_ptr_to_member_type:
     156             :   case DW_TAG_reference_type:
     157             :   case DW_TAG_rvalue_reference_type:
     158             :     break;
     159         299 :   default:
     160         299 :     dumpTypeTagName(OS, T);
     161             :   }
     162             : 
     163             :   // Follow the DW_AT_type if possible.
     164         933 :   dumpTypeName(OS, D);
     165             : 
     166         933 :   switch (T) {
     167          40 :   case DW_TAG_array_type:
     168          40 :     OS << "[]";
     169          40 :     break;
     170             :   case DW_TAG_pointer_type:
     171             :     OS << '*';
     172             :     break;
     173             :   case DW_TAG_ptr_to_member_type:
     174             :     OS << '*';
     175             :     break;
     176             :   case DW_TAG_reference_type:
     177             :     OS << '&';
     178             :     break;
     179           1 :   case DW_TAG_rvalue_reference_type:
     180           1 :     OS << "&&";
     181           1 :     break;
     182             :   default:
     183             :     break;
     184             :   }
     185             : }
     186             : 
     187       26911 : static void dumpAttribute(raw_ostream &OS, const DWARFDie &Die,
     188             :                           uint32_t *OffsetPtr, dwarf::Attribute Attr,
     189             :                           dwarf::Form Form, unsigned Indent,
     190             :                           DIDumpOptions DumpOpts) {
     191             :   if (!Die.isValid())
     192           0 :     return;
     193       26911 :   const char BaseIndent[] = "            ";
     194       26911 :   OS << BaseIndent;
     195       26911 :   OS.indent(Indent + 2);
     196       80733 :   WithColor(OS, HighlightColor::Attribute) << formatv("{0}", Attr);
     197             : 
     198       26911 :   if (DumpOpts.Verbose || DumpOpts.ShowForm)
     199       35474 :     OS << formatv(" [{0}]", Form);
     200             : 
     201       26911 :   DWARFUnit *U = Die.getDwarfUnit();
     202       26911 :   DWARFFormValue formValue(Form);
     203             : 
     204       53822 :   if (!formValue.extractValue(U->getDebugInfoExtractor(), OffsetPtr,
     205             :                               U->getFormParams(), U))
     206             :     return;
     207             : 
     208       26911 :   OS << "\t(";
     209             : 
     210       26911 :   StringRef Name;
     211             :   std::string File;
     212             :   auto Color = HighlightColor::Enumerator;
     213       26911 :   if (Attr == DW_AT_decl_file || Attr == DW_AT_call_file) {
     214             :     Color = HighlightColor::String;
     215        2777 :     if (const auto *LT = U->getContext().getLineTableForUnit(U))
     216        7815 :       if (LT->getFileNameByIndex(
     217        5210 :               formValue.getAsUnsignedConstant().getValue(),
     218             :               U->getCompilationDir(),
     219             :               DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath, File)) {
     220        7815 :         File = '"' + File + '"';
     221        2605 :         Name = File;
     222             :       }
     223       24134 :   } else if (Optional<uint64_t> Val = formValue.getAsUnsignedConstant())
     224        9846 :     Name = AttributeValueString(Attr, *Val);
     225             : 
     226       26911 :   if (!Name.empty())
     227        8400 :     WithColor(OS, Color) << Name;
     228       22711 :   else if (Attr == DW_AT_decl_line || Attr == DW_AT_call_line)
     229        2817 :     OS << *formValue.getAsUnsignedConstant();
     230       40261 :   else if (Attr == DW_AT_high_pc && !DumpOpts.ShowForm && !DumpOpts.Verbose &&
     231       20107 :            formValue.getAsUnsignedConstant()) {
     232         260 :     if (DumpOpts.ShowAddresses) {
     233             :       // Print the actual address rather than the offset.
     234             :       uint64_t LowPC, HighPC, Index;
     235         258 :       if (Die.getLowAndHighPC(LowPC, HighPC, Index))
     236         512 :         OS << format("0x%016" PRIx64, HighPC);
     237             :       else
     238           2 :         formValue.dump(OS, DumpOpts);
     239             :     }
     240       19634 :   } else if (Attr == DW_AT_location || Attr == DW_AT_frame_base ||
     241       17403 :              Attr == DW_AT_data_member_location ||
     242             :              Attr == DW_AT_GNU_call_site_value)
     243        2232 :     dumpLocation(OS, formValue, U, sizeof(BaseIndent) + Indent + 4, DumpOpts);
     244             :   else
     245       17402 :     formValue.dump(OS, DumpOpts);
     246             : 
     247             :   // We have dumped the attribute raw value. For some attributes
     248             :   // having both the raw value and the pretty-printed value is
     249             :   // interesting. These attributes are handled below.
     250       26911 :   if (Attr == DW_AT_specification || Attr == DW_AT_abstract_origin) {
     251         664 :     if (const char *Name = Die.getAttributeValueAsReferencedDie(Attr).getName(
     252         332 :             DINameKind::LinkageName))
     253         329 :       OS << " \"" << Name << '\"';
     254       26579 :   } else if (Attr == DW_AT_type) {
     255        2854 :     OS << " \"";
     256        2854 :     dumpTypeName(OS, Die);
     257             :     OS << '"';
     258       23725 :   } else if (Attr == DW_AT_APPLE_property_attribute) {
     259          25 :     if (Optional<uint64_t> OptVal = formValue.getAsUnsignedConstant())
     260          25 :       dumpApplePropertyAttribute(OS, *OptVal);
     261       23700 :   } else if (Attr == DW_AT_ranges) {
     262          48 :     const DWARFObject &Obj = Die.getDwarfUnit()->getContext().getDWARFObj();
     263             :     // For DW_FORM_rnglistx we need to dump the offset separately, since
     264             :     // we have only dumped the index so far.
     265          48 :     Optional<DWARFFormValue> Value = Die.find(DW_AT_ranges);
     266          48 :     if (Value && Value->getForm() == DW_FORM_rnglistx)
     267           3 :       if (auto RangeListOffset =
     268           6 :               U->getRnglistOffset(*Value->getAsSectionOffset())) {
     269             :         DWARFFormValue FV(dwarf::DW_FORM_sec_offset);
     270           2 :         FV.setUValue(*RangeListOffset);
     271           2 :         FV.dump(OS, DumpOpts);
     272             :       }
     273         144 :     dumpRanges(Obj, OS, Die.getAddressRanges(), U->getAddressByteSize(),
     274             :                sizeof(BaseIndent) + Indent + 4, DumpOpts);
     275             :   }
     276             : 
     277       26911 :   OS << ")\n";
     278             : }
     279             : 
     280        3516 : bool DWARFDie::isSubprogramDIE() const { return getTag() == DW_TAG_subprogram; }
     281             : 
     282       22570 : bool DWARFDie::isSubroutineDIE() const {
     283             :   auto Tag = getTag();
     284       22570 :   return Tag == DW_TAG_subprogram || Tag == DW_TAG_inlined_subroutine;
     285             : }
     286             : 
     287       68232 : Optional<DWARFFormValue> DWARFDie::find(dwarf::Attribute Attr) const {
     288             :   if (!isValid())
     289             :     return None;
     290             :   auto AbbrevDecl = getAbbreviationDeclarationPtr();
     291       68232 :   if (AbbrevDecl)
     292      132312 :     return AbbrevDecl->getAttributeValue(getOffset(), Attr, *U);
     293             :   return None;
     294             : }
     295             : 
     296             : Optional<DWARFFormValue>
     297       18129 : DWARFDie::find(ArrayRef<dwarf::Attribute> Attrs) const {
     298             :   if (!isValid())
     299             :     return None;
     300             :   auto AbbrevDecl = getAbbreviationDeclarationPtr();
     301       18129 :   if (AbbrevDecl) {
     302       47171 :     for (auto Attr : Attrs) {
     303       48138 :       if (auto Value = AbbrevDecl->getAttributeValue(getOffset(), Attr, *U))
     304             :         return Value;
     305             :     }
     306             :   }
     307             :   return None;
     308             : }
     309             : 
     310             : Optional<DWARFFormValue>
     311       16319 : DWARFDie::findRecursively(ArrayRef<dwarf::Attribute> Attrs) const {
     312             :   std::vector<DWARFDie> Worklist;
     313       16319 :   Worklist.push_back(*this);
     314             : 
     315             :   // Keep track if DIEs already seen to prevent infinite recursion.
     316             :   // Empirically we rarely see a depth of more than 3 when dealing with valid
     317             :   // DWARF. This corresponds to following the DW_AT_abstract_origin and
     318             :   // DW_AT_specification just once.
     319       16319 :   SmallSet<DWARFDie, 3> Seen;
     320             : 
     321       25122 :   while (!Worklist.empty()) {
     322       16634 :     DWARFDie Die = Worklist.back();
     323             :     Worklist.pop_back();
     324             : 
     325           0 :     if (!Die.isValid())
     326           2 :       continue;
     327             : 
     328       16636 :     if (Seen.count(Die))
     329           2 :       continue;
     330             : 
     331       16632 :     Seen.insert(Die);
     332             : 
     333       16632 :     if (auto Value = Die.find(Attrs))
     334             :       return Value;
     335             : 
     336        8801 :     if (auto D = Die.getAttributeValueAsReferencedDie(DW_AT_abstract_origin))
     337         270 :       Worklist.push_back(D);
     338             : 
     339        8801 :     if (auto D = Die.getAttributeValueAsReferencedDie(DW_AT_specification))
     340          46 :       Worklist.push_back(D);
     341             :   }
     342             : 
     343             :   return None;
     344             : }
     345             : 
     346             : DWARFDie
     347       21728 : DWARFDie::getAttributeValueAsReferencedDie(dwarf::Attribute Attr) const {
     348       43456 :   if (auto SpecRef = toReference(find(Attr))) {
     349        4324 :     if (auto SpecUnit = U->getUnitSection().getUnitForOffset(*SpecRef))
     350        4316 :       return SpecUnit->getDIEForOffset(*SpecRef);
     351             :   }
     352       17412 :   return DWARFDie();
     353             : }
     354             : 
     355          19 : Optional<uint64_t> DWARFDie::getRangesBaseAttribute() const {
     356          38 :   return toSectionOffset(find({DW_AT_rnglists_base, DW_AT_GNU_ranges_base}));
     357             : }
     358             : 
     359        2824 : Optional<uint64_t> DWARFDie::getHighPC(uint64_t LowPC) const {
     360        2824 :   if (auto FormValue = find(DW_AT_high_pc)) {
     361        1642 :     if (auto Address = FormValue->getAsAddress()) {
     362             :       // High PC is an address.
     363             :       return Address;
     364             :     }
     365        1247 :     if (auto Offset = FormValue->getAsUnsignedConstant()) {
     366             :       // High PC is an offset from LowPC.
     367        1247 :       return LowPC + *Offset;
     368             :     }
     369             :   }
     370             :   return None;
     371             : }
     372             : 
     373        6753 : bool DWARFDie::getLowAndHighPC(uint64_t &LowPC, uint64_t &HighPC,
     374             :                                uint64_t &SectionIndex) const {
     375        6753 :   auto F = find(DW_AT_low_pc);
     376             :   auto LowPcAddr = toAddress(F);
     377        6753 :   if (!LowPcAddr)
     378             :     return false;
     379        2571 :   if (auto HighPcAddr = getHighPC(*LowPcAddr)) {
     380        1402 :     LowPC = *LowPcAddr;
     381        1402 :     HighPC = *HighPcAddr;
     382        1402 :     SectionIndex = F->getSectionIndex();
     383             :     return true;
     384             :   }
     385        1169 :   return false;
     386             : }
     387             : 
     388        6473 : DWARFAddressRangesVector DWARFDie::getAddressRanges() const {
     389        6473 :   if (isNULL())
     390             :     return DWARFAddressRangesVector();
     391             :   // Single range specified by low/high PC.
     392             :   uint64_t LowPC, HighPC, Index;
     393        6471 :   if (getLowAndHighPC(LowPC, HighPC, Index))
     394        2280 :     return {{LowPC, HighPC, Index}};
     395             : 
     396        5331 :   Optional<DWARFFormValue> Value = find(DW_AT_ranges);
     397        5331 :   if (Value) {
     398        1167 :     if (Value->getForm() == DW_FORM_rnglistx)
     399           3 :       return U->findRnglistFromIndex(*Value->getAsSectionOffset());
     400        1164 :     return U->findRnglistFromOffset(*Value->getAsSectionOffset());
     401             :   }
     402             :   return DWARFAddressRangesVector();
     403             : }
     404             : 
     405        1006 : void DWARFDie::collectChildrenAddressRanges(
     406             :     DWARFAddressRangesVector &Ranges) const {
     407        1006 :   if (isNULL())
     408             :     return;
     409        1006 :   if (isSubprogramDIE()) {
     410          74 :     const auto &DIERanges = getAddressRanges();
     411         148 :     Ranges.insert(Ranges.end(), DIERanges.begin(), DIERanges.end());
     412             :   }
     413             : 
     414        1938 :   for (auto Child : children())
     415         466 :     Child.collectChildrenAddressRanges(Ranges);
     416             : }
     417             : 
     418           3 : bool DWARFDie::addressRangeContainsAddress(const uint64_t Address) const {
     419           7 :   for (const auto &R : getAddressRanges()) {
     420           3 :     if (R.LowPC <= Address && Address < R.HighPC)
     421             :       return true;
     422             :   }
     423           1 :   return false;
     424             : }
     425             : 
     426         583 : const char *DWARFDie::getSubroutineName(DINameKind Kind) const {
     427         583 :   if (!isSubroutineDIE())
     428             :     return nullptr;
     429         583 :   return getName(Kind);
     430             : }
     431             : 
     432        8840 : const char *DWARFDie::getName(DINameKind Kind) const {
     433        8840 :   if (!isValid() || Kind == DINameKind::None)
     434             :     return nullptr;
     435             :   // Try to get mangled name only if it was asked for.
     436        8840 :   if (Kind == DINameKind::LinkageName) {
     437         320 :     if (auto Name = dwarf::toString(
     438       13526 :             findRecursively({DW_AT_MIPS_linkage_name, DW_AT_linkage_name}),
     439             :             nullptr))
     440             :       return Name;
     441             :   }
     442       25560 :   if (auto Name = dwarf::toString(findRecursively(DW_AT_name), nullptr))
     443             :     return Name;
     444             :   return nullptr;
     445             : }
     446             : 
     447         746 : uint64_t DWARFDie::getDeclLine() const {
     448        2238 :   return toUnsigned(findRecursively(DW_AT_decl_line), 0);
     449             : }
     450             : 
     451          55 : void DWARFDie::getCallerFrame(uint32_t &CallFile, uint32_t &CallLine,
     452             :                               uint32_t &CallColumn,
     453             :                               uint32_t &CallDiscriminator) const {
     454         110 :   CallFile = toUnsigned(find(DW_AT_call_file), 0);
     455         110 :   CallLine = toUnsigned(find(DW_AT_call_line), 0);
     456         110 :   CallColumn = toUnsigned(find(DW_AT_call_column), 0);
     457         110 :   CallDiscriminator = toUnsigned(find(DW_AT_GNU_discriminator), 0);
     458          55 : }
     459             : 
     460             : /// Helper to dump a DIE with all of its parents, but no siblings.
     461           8 : static unsigned dumpParentChain(DWARFDie Die, raw_ostream &OS, unsigned Indent,
     462             :                                 DIDumpOptions DumpOpts) {
     463             :   if (!Die)
     464             :     return Indent;
     465           4 :   Indent = dumpParentChain(Die.getParent(), OS, Indent, DumpOpts);
     466           4 :   Die.dump(OS, Indent, DumpOpts);
     467           4 :   return Indent + 2;
     468             : }
     469             : 
     470        7802 : void DWARFDie::dump(raw_ostream &OS, unsigned Indent,
     471             :                     DIDumpOptions DumpOpts) const {
     472             :   if (!isValid())
     473           1 :     return;
     474        7801 :   DWARFDataExtractor debug_info_data = U->getDebugInfoExtractor();
     475        7801 :   const uint32_t Offset = getOffset();
     476        7801 :   uint32_t offset = Offset;
     477        7801 :   if (DumpOpts.ShowParents) {
     478           4 :     DIDumpOptions ParentDumpOpts = DumpOpts;
     479           4 :     ParentDumpOpts.ShowParents = false;
     480           4 :     ParentDumpOpts.ShowChildren = false;
     481           4 :     Indent = dumpParentChain(getParent(), OS, Indent, ParentDumpOpts);
     482             :   }
     483             : 
     484       15602 :   if (debug_info_data.isValidOffset(offset)) {
     485        7801 :     uint32_t abbrCode = debug_info_data.getULEB128(&offset);
     486        7801 :     if (DumpOpts.ShowAddresses)
     487       15594 :       WithColor(OS, HighlightColor::Address).get()
     488        7797 :           << format("\n0x%8.8x: ", Offset);
     489             : 
     490        7801 :     if (abbrCode) {
     491        5950 :       auto AbbrevDecl = getAbbreviationDeclarationPtr();
     492        5950 :       if (AbbrevDecl) {
     493       17850 :         WithColor(OS, HighlightColor::Tag).get().indent(Indent)
     494       11900 :             << formatv("{0}", getTag());
     495        5950 :         if (DumpOpts.Verbose)
     496        4031 :           OS << format(" [%u] %c", abbrCode,
     497        4031 :                        AbbrevDecl->hasChildren() ? '*' : ' ');
     498             :         OS << '\n';
     499             : 
     500             :         // Dump all data in the DIE for the attributes.
     501       59772 :         for (const auto &AttrSpec : AbbrevDecl->attributes()) {
     502       26911 :           if (AttrSpec.Form == DW_FORM_implicit_const) {
     503             :             // We are dumping .debug_info section ,
     504             :             // implicit_const attribute values are not really stored here,
     505             :             // but in .debug_abbrev section. So we just skip such attrs.
     506           0 :             continue;
     507             :           }
     508       26911 :           dumpAttribute(OS, *this, &offset, AttrSpec.Attr, AttrSpec.Form,
     509             :                         Indent, DumpOpts);
     510             :         }
     511             : 
     512        5950 :         DWARFDie child = getFirstChild();
     513        5950 :         if (DumpOpts.ShowChildren && DumpOpts.RecurseDepth > 0 && child) {
     514        1851 :           DumpOpts.RecurseDepth--;
     515        1851 :           DIDumpOptions ChildDumpOpts = DumpOpts;
     516        1851 :           ChildDumpOpts.ShowParents = false;
     517        6918 :           while (child) {
     518        6918 :             child.dump(OS, Indent + 2, ChildDumpOpts);
     519        6918 :             child = child.getSibling();
     520             :           }
     521             :         }
     522             :       } else {
     523           0 :         OS << "Abbreviation code not found in 'debug_abbrev' class for code: "
     524             :            << abbrCode << '\n';
     525             :       }
     526             :     } else {
     527        1851 :       OS.indent(Indent) << "NULL\n";
     528             :     }
     529             :   }
     530             : }
     531             : 
     532           0 : LLVM_DUMP_METHOD void DWARFDie::dump() const { dump(llvm::errs(), 0); }
     533             : 
     534          77 : DWARFDie DWARFDie::getParent() const {
     535             :   if (isValid())
     536          76 :     return U->getParent(Die);
     537           1 :   return DWARFDie();
     538             : }
     539             : 
     540       34313 : DWARFDie DWARFDie::getSibling() const {
     541             :   if (isValid())
     542       34312 :     return U->getSibling(Die);
     543           1 :   return DWARFDie();
     544             : }
     545             : 
     546       32243 : DWARFDie DWARFDie::getFirstChild() const {
     547             :   if (isValid())
     548       32241 :     return U->getFirstChild(Die);
     549           2 :   return DWARFDie();
     550             : }
     551             : 
     552         400 : iterator_range<DWARFDie::attribute_iterator> DWARFDie::attributes() const {
     553             :   return make_range(attribute_iterator(*this, false),
     554         400 :                     attribute_iterator(*this, true));
     555             : }
     556             : 
     557         800 : DWARFDie::attribute_iterator::attribute_iterator(DWARFDie D, bool End)
     558        1600 :     : Die(D), AttrValue(0), Index(0) {
     559         800 :   auto AbbrDecl = Die.getAbbreviationDeclarationPtr();
     560             :   assert(AbbrDecl && "Must have abbreviation declaration");
     561         800 :   if (End) {
     562             :     // This is the end iterator so we set the index to the attribute count.
     563         400 :     Index = AbbrDecl->getNumAttributes();
     564             :   } else {
     565             :     // This is the begin iterator so we extract the value for this->Index.
     566         800 :     AttrValue.Offset = D.getOffset() + AbbrDecl->getCodeByteSize();
     567         400 :     updateForIndex(*AbbrDecl, 0);
     568             :   }
     569         800 : }
     570             : 
     571        2188 : void DWARFDie::attribute_iterator::updateForIndex(
     572             :     const DWARFAbbreviationDeclaration &AbbrDecl, uint32_t I) {
     573        2188 :   Index = I;
     574             :   // AbbrDecl must be valid before calling this function.
     575             :   auto NumAttrs = AbbrDecl.getNumAttributes();
     576        2188 :   if (Index < NumAttrs) {
     577        1788 :     AttrValue.Attr = AbbrDecl.getAttrByIndex(Index);
     578             :     // Add the previous byte size of any previous attribute value.
     579        1788 :     AttrValue.Offset += AttrValue.ByteSize;
     580             :     AttrValue.Value.setForm(AbbrDecl.getFormByIndex(Index));
     581        1788 :     uint32_t ParseOffset = AttrValue.Offset;
     582        1788 :     auto U = Die.getDwarfUnit();
     583             :     assert(U && "Die must have valid DWARF unit");
     584        3576 :     bool b = AttrValue.Value.extractValue(U->getDebugInfoExtractor(),
     585             :                                           &ParseOffset, U->getFormParams(), U);
     586             :     (void)b;
     587             :     assert(b && "extractValue cannot fail on fully parsed DWARF");
     588        1788 :     AttrValue.ByteSize = ParseOffset - AttrValue.Offset;
     589             :   } else {
     590             :     assert(Index == NumAttrs && "Indexes should be [0, NumAttrs) only");
     591             :     AttrValue.clear();
     592             :   }
     593        2188 : }
     594             : 
     595        1788 : DWARFDie::attribute_iterator &DWARFDie::attribute_iterator::operator++() {
     596        3576 :   if (auto AbbrDecl = Die.getAbbreviationDeclarationPtr())
     597        1788 :     updateForIndex(*AbbrDecl, Index + 1);
     598        1788 :   return *this;
     599             : }

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