xref: /freebsd/contrib/llvm-project/llvm/lib/DebugInfo/GSYM/DwarfTransformer.cpp (revision 924226fba12cc9a228c73b956e1b7fa24c60b055)
1 //===- DwarfTransformer.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 <thread>
10 #include <unordered_set>
11 
12 #include "llvm/DebugInfo/DIContext.h"
13 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
14 #include "llvm/Support/Error.h"
15 #include "llvm/Support/ThreadPool.h"
16 #include "llvm/Support/raw_ostream.h"
17 
18 #include "llvm/DebugInfo/GSYM/DwarfTransformer.h"
19 #include "llvm/DebugInfo/GSYM/FunctionInfo.h"
20 #include "llvm/DebugInfo/GSYM/GsymCreator.h"
21 #include "llvm/DebugInfo/GSYM/GsymReader.h"
22 #include "llvm/DebugInfo/GSYM/InlineInfo.h"
23 
24 using namespace llvm;
25 using namespace gsym;
26 
27 struct llvm::gsym::CUInfo {
28   const DWARFDebugLine::LineTable *LineTable;
29   const char *CompDir;
30   std::vector<uint32_t> FileCache;
31   uint64_t Language = 0;
32   uint8_t AddrSize = 0;
33 
34   CUInfo(DWARFContext &DICtx, DWARFCompileUnit *CU) {
35     LineTable = DICtx.getLineTableForUnit(CU);
36     CompDir = CU->getCompilationDir();
37     FileCache.clear();
38     if (LineTable)
39       FileCache.assign(LineTable->Prologue.FileNames.size() + 1, UINT32_MAX);
40     DWARFDie Die = CU->getUnitDIE();
41     Language = dwarf::toUnsigned(Die.find(dwarf::DW_AT_language), 0);
42     AddrSize = CU->getAddressByteSize();
43   }
44 
45   /// Return true if Addr is the highest address for a given compile unit. The
46   /// highest address is encoded as -1, of all ones in the address. These high
47   /// addresses are used by some linkers to indicate that a function has been
48   /// dead stripped or didn't end up in the linked executable.
49   bool isHighestAddress(uint64_t Addr) const {
50     if (AddrSize == 4)
51       return Addr == UINT32_MAX;
52     else if (AddrSize == 8)
53       return Addr == UINT64_MAX;
54     return false;
55   }
56 
57   /// Convert a DWARF compile unit file index into a GSYM global file index.
58   ///
59   /// Each compile unit in DWARF has its own file table in the line table
60   /// prologue. GSYM has a single large file table that applies to all files
61   /// from all of the info in a GSYM file. This function converts between the
62   /// two and caches and DWARF CU file index that has already been converted so
63   /// the first client that asks for a compile unit file index will end up
64   /// doing the conversion, and subsequent clients will get the cached GSYM
65   /// index.
66   uint32_t DWARFToGSYMFileIndex(GsymCreator &Gsym, uint32_t DwarfFileIdx) {
67     if (!LineTable)
68       return 0;
69     assert(DwarfFileIdx < FileCache.size());
70     uint32_t &GsymFileIdx = FileCache[DwarfFileIdx];
71     if (GsymFileIdx != UINT32_MAX)
72       return GsymFileIdx;
73     std::string File;
74     if (LineTable->getFileNameByIndex(
75             DwarfFileIdx, CompDir,
76             DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath, File))
77       GsymFileIdx = Gsym.insertFile(File);
78     else
79       GsymFileIdx = 0;
80     return GsymFileIdx;
81   }
82 };
83 
84 
85 static DWARFDie GetParentDeclContextDIE(DWARFDie &Die) {
86   if (DWARFDie SpecDie =
87           Die.getAttributeValueAsReferencedDie(dwarf::DW_AT_specification)) {
88     if (DWARFDie SpecParent = GetParentDeclContextDIE(SpecDie))
89       return SpecParent;
90   }
91   if (DWARFDie AbstDie =
92           Die.getAttributeValueAsReferencedDie(dwarf::DW_AT_abstract_origin)) {
93     if (DWARFDie AbstParent = GetParentDeclContextDIE(AbstDie))
94       return AbstParent;
95   }
96 
97   // We never want to follow parent for inlined subroutine - that would
98   // give us information about where the function is inlined, not what
99   // function is inlined
100   if (Die.getTag() == dwarf::DW_TAG_inlined_subroutine)
101     return DWARFDie();
102 
103   DWARFDie ParentDie = Die.getParent();
104   if (!ParentDie)
105     return DWARFDie();
106 
107   switch (ParentDie.getTag()) {
108   case dwarf::DW_TAG_namespace:
109   case dwarf::DW_TAG_structure_type:
110   case dwarf::DW_TAG_union_type:
111   case dwarf::DW_TAG_class_type:
112   case dwarf::DW_TAG_subprogram:
113     return ParentDie; // Found parent decl context DIE
114   case dwarf::DW_TAG_lexical_block:
115     return GetParentDeclContextDIE(ParentDie);
116   default:
117     break;
118   }
119 
120   return DWARFDie();
121 }
122 
123 /// Get the GsymCreator string table offset for the qualified name for the
124 /// DIE passed in. This function will avoid making copies of any strings in
125 /// the GsymCreator when possible. We don't need to copy a string when the
126 /// string comes from our .debug_str section or is an inlined string in the
127 /// .debug_info. If we create a qualified name string in this function by
128 /// combining multiple strings in the DWARF string table or info, we will make
129 /// a copy of the string when we add it to the string table.
130 static Optional<uint32_t> getQualifiedNameIndex(DWARFDie &Die,
131                                                 uint64_t Language,
132                                                 GsymCreator &Gsym) {
133   // If the dwarf has mangled name, use mangled name
134   if (auto LinkageName =
135           dwarf::toString(Die.findRecursively({dwarf::DW_AT_MIPS_linkage_name,
136                                                dwarf::DW_AT_linkage_name}),
137                           nullptr))
138     return Gsym.insertString(LinkageName, /* Copy */ false);
139 
140   StringRef ShortName(Die.getName(DINameKind::ShortName));
141   if (ShortName.empty())
142     return llvm::None;
143 
144   // For C++ and ObjC, prepend names of all parent declaration contexts
145   if (!(Language == dwarf::DW_LANG_C_plus_plus ||
146         Language == dwarf::DW_LANG_C_plus_plus_03 ||
147         Language == dwarf::DW_LANG_C_plus_plus_11 ||
148         Language == dwarf::DW_LANG_C_plus_plus_14 ||
149         Language == dwarf::DW_LANG_ObjC_plus_plus ||
150         // This should not be needed for C, but we see C++ code marked as C
151         // in some binaries. This should hurt, so let's do it for C as well
152         Language == dwarf::DW_LANG_C))
153     return Gsym.insertString(ShortName, /* Copy */ false);
154 
155   // Some GCC optimizations create functions with names ending with .isra.<num>
156   // or .part.<num> and those names are just DW_AT_name, not DW_AT_linkage_name
157   // If it looks like it could be the case, don't add any prefix
158   if (ShortName.startswith("_Z") &&
159       (ShortName.contains(".isra.") || ShortName.contains(".part.")))
160     return Gsym.insertString(ShortName, /* Copy */ false);
161 
162   DWARFDie ParentDeclCtxDie = GetParentDeclContextDIE(Die);
163   if (ParentDeclCtxDie) {
164     std::string Name = ShortName.str();
165     while (ParentDeclCtxDie) {
166       StringRef ParentName(ParentDeclCtxDie.getName(DINameKind::ShortName));
167       if (!ParentName.empty()) {
168         // "lambda" names are wrapped in < >. Replace with { }
169         // to be consistent with demangled names and not to confuse with
170         // templates
171         if (ParentName.front() == '<' && ParentName.back() == '>')
172           Name = "{" + ParentName.substr(1, ParentName.size() - 2).str() + "}" +
173                 "::" + Name;
174         else
175           Name = ParentName.str() + "::" + Name;
176       }
177       ParentDeclCtxDie = GetParentDeclContextDIE(ParentDeclCtxDie);
178     }
179     // Copy the name since we created a new name in a std::string.
180     return Gsym.insertString(Name, /* Copy */ true);
181   }
182   // Don't copy the name since it exists in the DWARF object file.
183   return Gsym.insertString(ShortName, /* Copy */ false);
184 }
185 
186 static bool hasInlineInfo(DWARFDie Die, uint32_t Depth) {
187   bool CheckChildren = true;
188   switch (Die.getTag()) {
189   case dwarf::DW_TAG_subprogram:
190     // Don't look into functions within functions.
191     CheckChildren = Depth == 0;
192     break;
193   case dwarf::DW_TAG_inlined_subroutine:
194     return true;
195   default:
196     break;
197   }
198   if (!CheckChildren)
199     return false;
200   for (DWARFDie ChildDie : Die.children()) {
201     if (hasInlineInfo(ChildDie, Depth + 1))
202       return true;
203   }
204   return false;
205 }
206 
207 static void parseInlineInfo(GsymCreator &Gsym, CUInfo &CUI, DWARFDie Die,
208                             uint32_t Depth, FunctionInfo &FI,
209                             InlineInfo &parent) {
210   if (!hasInlineInfo(Die, Depth))
211     return;
212 
213   dwarf::Tag Tag = Die.getTag();
214   if (Tag == dwarf::DW_TAG_inlined_subroutine) {
215     // create new InlineInfo and append to parent.children
216     InlineInfo II;
217     DWARFAddressRange FuncRange =
218         DWARFAddressRange(FI.startAddress(), FI.endAddress());
219     Expected<DWARFAddressRangesVector> RangesOrError = Die.getAddressRanges();
220     if (RangesOrError) {
221       for (const DWARFAddressRange &Range : RangesOrError.get()) {
222         // Check that the inlined function is within the range of the function
223         // info, it might not be in case of split functions
224         if (FuncRange.LowPC <= Range.LowPC && Range.HighPC <= FuncRange.HighPC)
225           II.Ranges.insert(AddressRange(Range.LowPC, Range.HighPC));
226       }
227     }
228     if (II.Ranges.empty())
229       return;
230 
231     if (auto NameIndex = getQualifiedNameIndex(Die, CUI.Language, Gsym))
232       II.Name = *NameIndex;
233     II.CallFile = CUI.DWARFToGSYMFileIndex(
234         Gsym, dwarf::toUnsigned(Die.find(dwarf::DW_AT_call_file), 0));
235     II.CallLine = dwarf::toUnsigned(Die.find(dwarf::DW_AT_call_line), 0);
236     // parse all children and append to parent
237     for (DWARFDie ChildDie : Die.children())
238       parseInlineInfo(Gsym, CUI, ChildDie, Depth + 1, FI, II);
239     parent.Children.emplace_back(std::move(II));
240     return;
241   }
242   if (Tag == dwarf::DW_TAG_subprogram || Tag == dwarf::DW_TAG_lexical_block) {
243     // skip this Die and just recurse down
244     for (DWARFDie ChildDie : Die.children())
245       parseInlineInfo(Gsym, CUI, ChildDie, Depth + 1, FI, parent);
246   }
247 }
248 
249 static void convertFunctionLineTable(raw_ostream &Log, CUInfo &CUI,
250                                      DWARFDie Die, GsymCreator &Gsym,
251                                      FunctionInfo &FI) {
252   std::vector<uint32_t> RowVector;
253   const uint64_t StartAddress = FI.startAddress();
254   const uint64_t EndAddress = FI.endAddress();
255   const uint64_t RangeSize = EndAddress - StartAddress;
256   const object::SectionedAddress SecAddress{
257       StartAddress, object::SectionedAddress::UndefSection};
258 
259 
260   if (!CUI.LineTable->lookupAddressRange(SecAddress, RangeSize, RowVector)) {
261     // If we have a DW_TAG_subprogram but no line entries, fall back to using
262     // the DW_AT_decl_file an d DW_AT_decl_line if we have both attributes.
263     std::string FilePath = Die.getDeclFile(
264         DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath);
265     if (FilePath.empty())
266       return;
267     if (auto Line =
268             dwarf::toUnsigned(Die.findRecursively({dwarf::DW_AT_decl_line}))) {
269       LineEntry LE(StartAddress, Gsym.insertFile(FilePath), *Line);
270       FI.OptLineTable = LineTable();
271       FI.OptLineTable->push(LE);
272     }
273     return;
274   }
275 
276   FI.OptLineTable = LineTable();
277   DWARFDebugLine::Row PrevRow;
278   for (uint32_t RowIndex : RowVector) {
279     // Take file number and line/column from the row.
280     const DWARFDebugLine::Row &Row = CUI.LineTable->Rows[RowIndex];
281     const uint32_t FileIdx = CUI.DWARFToGSYMFileIndex(Gsym, Row.File);
282     uint64_t RowAddress = Row.Address.Address;
283     // Watch out for a RowAddress that is in the middle of a line table entry
284     // in the DWARF. If we pass an address in between two line table entries
285     // we will get a RowIndex for the previous valid line table row which won't
286     // be contained in our function. This is usually a bug in the DWARF due to
287     // linker problems or LTO or other DWARF re-linking so it is worth emitting
288     // an error, but not worth stopping the creation of the GSYM.
289     if (!FI.Range.contains(RowAddress)) {
290       if (RowAddress < FI.Range.Start) {
291         Log << "error: DIE has a start address whose LowPC is between the "
292           "line table Row[" << RowIndex << "] with address "
293           << HEX64(RowAddress) << " and the next one.\n";
294         Die.dump(Log, 0, DIDumpOptions::getForSingleDIE());
295         RowAddress = FI.Range.Start;
296       } else {
297         continue;
298       }
299     }
300 
301     LineEntry LE(RowAddress, FileIdx, Row.Line);
302     if (RowIndex != RowVector[0] && Row.Address < PrevRow.Address) {
303       // We have seen full duplicate line tables for functions in some
304       // DWARF files. Watch for those here by checking the the last
305       // row was the function's end address (HighPC) and that the
306       // current line table entry's address is the same as the first
307       // line entry we already have in our "function_info.Lines". If
308       // so break out after printing a warning.
309       auto FirstLE = FI.OptLineTable->first();
310       if (FirstLE && *FirstLE == LE) {
311         if (!Gsym.isQuiet()) {
312           Log << "warning: duplicate line table detected for DIE:\n";
313           Die.dump(Log, 0, DIDumpOptions::getForSingleDIE());
314         }
315       } else {
316         // Print out (ignore if os == nulls as this is expensive)
317         Log << "error: line table has addresses that do not "
318              << "monotonically increase:\n";
319         for (uint32_t RowIndex2 : RowVector) {
320           CUI.LineTable->Rows[RowIndex2].dump(Log);
321         }
322         Die.dump(Log, 0, DIDumpOptions::getForSingleDIE());
323       }
324       break;
325     }
326 
327     // Skip multiple line entries for the same file and line.
328     auto LastLE = FI.OptLineTable->last();
329     if (LastLE && LastLE->File == FileIdx && LastLE->Line == Row.Line)
330         continue;
331     // Only push a row if it isn't an end sequence. End sequence markers are
332     // included for the last address in a function or the last contiguous
333     // address in a sequence.
334     if (Row.EndSequence) {
335       // End sequence means that the next line entry could have a lower address
336       // that the previous entries. So we clear the previous row so we don't
337       // trigger the line table error about address that do not monotonically
338       // increase.
339       PrevRow = DWARFDebugLine::Row();
340     } else {
341       FI.OptLineTable->push(LE);
342       PrevRow = Row;
343     }
344   }
345   // If not line table rows were added, clear the line table so we don't encode
346   // on in the GSYM file.
347   if (FI.OptLineTable->empty())
348     FI.OptLineTable = llvm::None;
349 }
350 
351 void DwarfTransformer::handleDie(raw_ostream &OS, CUInfo &CUI, DWARFDie Die) {
352   switch (Die.getTag()) {
353   case dwarf::DW_TAG_subprogram: {
354     Expected<DWARFAddressRangesVector> RangesOrError = Die.getAddressRanges();
355     if (!RangesOrError) {
356       consumeError(RangesOrError.takeError());
357       break;
358     }
359     const DWARFAddressRangesVector &Ranges = RangesOrError.get();
360     if (Ranges.empty())
361       break;
362     auto NameIndex = getQualifiedNameIndex(Die, CUI.Language, Gsym);
363     if (!NameIndex) {
364       OS << "error: function at " << HEX64(Die.getOffset())
365          << " has no name\n ";
366       Die.dump(OS, 0, DIDumpOptions::getForSingleDIE());
367       break;
368     }
369 
370     // Create a function_info for each range
371     for (const DWARFAddressRange &Range : Ranges) {
372       // The low PC must be less than the high PC. Many linkers don't remove
373       // DWARF for functions that don't get linked into the final executable.
374       // If both the high and low pc have relocations, linkers will often set
375       // the address values for both to the same value to indicate the function
376       // has been remove. Other linkers have been known to set the one or both
377       // PC values to a UINT32_MAX for 4 byte addresses and UINT64_MAX for 8
378       // byte addresses to indicate the function isn't valid. The check below
379       // tries to watch for these cases and abort if it runs into them.
380       if (Range.LowPC >= Range.HighPC || CUI.isHighestAddress(Range.LowPC))
381         break;
382 
383       // Many linkers can't remove DWARF and might set the LowPC to zero. Since
384       // high PC can be an offset from the low PC in more recent DWARF versions
385       // we need to watch for a zero'ed low pc which we do using
386       // ValidTextRanges below.
387       if (!Gsym.IsValidTextAddress(Range.LowPC)) {
388         // We expect zero and -1 to be invalid addresses in DWARF depending
389         // on the linker of the DWARF. This indicates a function was stripped
390         // and the debug info wasn't able to be stripped from the DWARF. If
391         // the LowPC isn't zero or -1, then we should emit an error.
392         if (Range.LowPC != 0) {
393           if (!Gsym.isQuiet()) {
394             // Unexpected invalid address, emit a warning
395             OS << "warning: DIE has an address range whose start address is "
396                   "not in any executable sections ("
397                << *Gsym.GetValidTextRanges()
398                << ") and will not be processed:\n";
399             Die.dump(OS, 0, DIDumpOptions::getForSingleDIE());
400           }
401         }
402         break;
403       }
404 
405       FunctionInfo FI;
406       FI.setStartAddress(Range.LowPC);
407       FI.setEndAddress(Range.HighPC);
408       FI.Name = *NameIndex;
409       if (CUI.LineTable) {
410         convertFunctionLineTable(OS, CUI, Die, Gsym, FI);
411       }
412       if (hasInlineInfo(Die, 0)) {
413         FI.Inline = InlineInfo();
414         FI.Inline->Name = *NameIndex;
415         FI.Inline->Ranges.insert(FI.Range);
416         parseInlineInfo(Gsym, CUI, Die, 0, FI, *FI.Inline);
417       }
418       Gsym.addFunctionInfo(std::move(FI));
419     }
420   } break;
421   default:
422     break;
423   }
424   for (DWARFDie ChildDie : Die.children())
425     handleDie(OS, CUI, ChildDie);
426 }
427 
428 Error DwarfTransformer::convert(uint32_t NumThreads) {
429   size_t NumBefore = Gsym.getNumFunctionInfos();
430   if (NumThreads == 1) {
431     // Parse all DWARF data from this thread, use the same string/file table
432     // for everything
433     for (const auto &CU : DICtx.compile_units()) {
434       DWARFDie Die = CU->getUnitDIE(false);
435       CUInfo CUI(DICtx, dyn_cast<DWARFCompileUnit>(CU.get()));
436       handleDie(Log, CUI, Die);
437     }
438   } else {
439     // LLVM Dwarf parser is not thread-safe and we need to parse all DWARF up
440     // front before we start accessing any DIEs since there might be
441     // cross compile unit references in the DWARF. If we don't do this we can
442     // end up crashing.
443 
444     // We need to call getAbbreviations sequentially first so that getUnitDIE()
445     // only works with its local data.
446     for (const auto &CU : DICtx.compile_units())
447       CU->getAbbreviations();
448 
449     // Now parse all DIEs in case we have cross compile unit references in a
450     // thread pool.
451     ThreadPool pool(hardware_concurrency(NumThreads));
452     for (const auto &CU : DICtx.compile_units())
453       pool.async([&CU]() { CU->getUnitDIE(false /*CUDieOnly*/); });
454     pool.wait();
455 
456     // Now convert all DWARF to GSYM in a thread pool.
457     std::mutex LogMutex;
458     for (const auto &CU : DICtx.compile_units()) {
459       DWARFDie Die = CU->getUnitDIE(false /*CUDieOnly*/);
460       if (Die) {
461         CUInfo CUI(DICtx, dyn_cast<DWARFCompileUnit>(CU.get()));
462         pool.async([this, CUI, &LogMutex, Die]() mutable {
463           std::string ThreadLogStorage;
464           raw_string_ostream ThreadOS(ThreadLogStorage);
465           handleDie(ThreadOS, CUI, Die);
466           ThreadOS.flush();
467           if (!ThreadLogStorage.empty()) {
468             // Print ThreadLogStorage lines into an actual stream under a lock
469             std::lock_guard<std::mutex> guard(LogMutex);
470             Log << ThreadLogStorage;
471           }
472         });
473       }
474     }
475     pool.wait();
476   }
477   size_t FunctionsAddedCount = Gsym.getNumFunctionInfos() - NumBefore;
478   Log << "Loaded " << FunctionsAddedCount << " functions from DWARF.\n";
479   return Error::success();
480 }
481 
482 llvm::Error DwarfTransformer::verify(StringRef GsymPath) {
483   Log << "Verifying GSYM file \"" << GsymPath << "\":\n";
484 
485   auto Gsym = GsymReader::openFile(GsymPath);
486   if (!Gsym)
487     return Gsym.takeError();
488 
489   auto NumAddrs = Gsym->getNumAddresses();
490   DILineInfoSpecifier DLIS(
491       DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath,
492       DILineInfoSpecifier::FunctionNameKind::LinkageName);
493   std::string gsymFilename;
494   for (uint32_t I = 0; I < NumAddrs; ++I) {
495     auto FuncAddr = Gsym->getAddress(I);
496     if (!FuncAddr)
497         return createStringError(std::errc::invalid_argument,
498                                   "failed to extract address[%i]", I);
499 
500     auto FI = Gsym->getFunctionInfo(*FuncAddr);
501     if (!FI)
502       return createStringError(std::errc::invalid_argument,
503                             "failed to extract function info for address 0x%"
504                             PRIu64, *FuncAddr);
505 
506     for (auto Addr = *FuncAddr; Addr < *FuncAddr + FI->size(); ++Addr) {
507       const object::SectionedAddress SectAddr{
508           Addr, object::SectionedAddress::UndefSection};
509       auto LR = Gsym->lookup(Addr);
510       if (!LR)
511         return LR.takeError();
512 
513       auto DwarfInlineInfos =
514           DICtx.getInliningInfoForAddress(SectAddr, DLIS);
515       uint32_t NumDwarfInlineInfos = DwarfInlineInfos.getNumberOfFrames();
516       if (NumDwarfInlineInfos == 0) {
517         DwarfInlineInfos.addFrame(
518             DICtx.getLineInfoForAddress(SectAddr, DLIS));
519       }
520 
521       // Check for 1 entry that has no file and line info
522       if (NumDwarfInlineInfos == 1 &&
523           DwarfInlineInfos.getFrame(0).FileName == "<invalid>") {
524         DwarfInlineInfos = DIInliningInfo();
525         NumDwarfInlineInfos = 0;
526       }
527       if (NumDwarfInlineInfos > 0 &&
528           NumDwarfInlineInfos != LR->Locations.size()) {
529         Log << "error: address " << HEX64(Addr) << " has "
530             << NumDwarfInlineInfos << " DWARF inline frames and GSYM has "
531             << LR->Locations.size() << "\n";
532         Log << "    " << NumDwarfInlineInfos << " DWARF frames:\n";
533         for (size_t Idx = 0; Idx < NumDwarfInlineInfos; ++Idx) {
534           const auto &dii = DwarfInlineInfos.getFrame(Idx);
535           Log << "    [" << Idx << "]: " << dii.FunctionName << " @ "
536               << dii.FileName << ':' << dii.Line << '\n';
537         }
538         Log << "    " << LR->Locations.size() << " GSYM frames:\n";
539         for (size_t Idx = 0, count = LR->Locations.size();
540               Idx < count; ++Idx) {
541           const auto &gii = LR->Locations[Idx];
542           Log << "    [" << Idx << "]: " << gii.Name << " @ " << gii.Dir
543               << '/' << gii.Base << ':' << gii.Line << '\n';
544         }
545         DwarfInlineInfos = DICtx.getInliningInfoForAddress(SectAddr, DLIS);
546         Gsym->dump(Log, *FI);
547         continue;
548       }
549 
550       for (size_t Idx = 0, count = LR->Locations.size(); Idx < count;
551             ++Idx) {
552         const auto &gii = LR->Locations[Idx];
553         if (Idx < NumDwarfInlineInfos) {
554           const auto &dii = DwarfInlineInfos.getFrame(Idx);
555           gsymFilename = LR->getSourceFile(Idx);
556           // Verify function name
557           if (dii.FunctionName.find(gii.Name.str()) != 0)
558             Log << "error: address " << HEX64(Addr) << " DWARF function \""
559                 << dii.FunctionName.c_str()
560                 << "\" doesn't match GSYM function \"" << gii.Name << "\"\n";
561           // Verify source file path
562           if (dii.FileName != gsymFilename)
563             Log << "error: address " << HEX64(Addr) << " DWARF path \""
564                 << dii.FileName.c_str() << "\" doesn't match GSYM path \""
565                 << gsymFilename.c_str() << "\"\n";
566           // Verify source file line
567           if (dii.Line != gii.Line)
568             Log << "error: address " << HEX64(Addr) << " DWARF line "
569                 << dii.Line << " != GSYM line " << gii.Line << "\n";
570         }
571       }
572     }
573   }
574   return Error::success();
575 }
576