1 //===- llvm-cxxdump.cpp - Dump C++ data in an Object File -------*- C++ -*-===//
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 // Dumps C++ data resident in object files and archives.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "llvm-cxxdump.h"
14 #include "Error.h"
15 #include "llvm/ADT/ArrayRef.h"
16 #include "llvm/MC/TargetRegistry.h"
17 #include "llvm/Object/Archive.h"
18 #include "llvm/Object/ObjectFile.h"
19 #include "llvm/Object/SymbolSize.h"
20 #include "llvm/Support/Debug.h"
21 #include "llvm/Support/Endian.h"
22 #include "llvm/Support/FileSystem.h"
23 #include "llvm/Support/InitLLVM.h"
24 #include "llvm/Support/TargetSelect.h"
25 #include "llvm/Support/WithColor.h"
26 #include "llvm/Support/raw_ostream.h"
27 #include <map>
28 #include <string>
29 #include <system_error>
30 
31 using namespace llvm;
32 using namespace llvm::object;
33 using namespace llvm::support;
34 
35 namespace opts {
36 cl::OptionCategory CXXDumpCategory("CXX Dump Options");
37 cl::list<std::string> InputFilenames(cl::Positional,
38                                      cl::desc("<input object files>"),
39                                      cl::ZeroOrMore, cl::cat(CXXDumpCategory));
40 } // namespace opts
41 
42 namespace llvm {
43 
44 static void error(std::error_code EC) {
45   if (!EC)
46     return;
47   WithColor::error(outs(), "") << "reading file: " << EC.message() << ".\n";
48   outs().flush();
49   exit(1);
50 }
51 
52 [[noreturn]] static void error(Error Err) {
53   logAllUnhandledErrors(std::move(Err), WithColor::error(outs()),
54                         "reading file: ");
55   outs().flush();
56   exit(1);
57 }
58 
59 template <typename T>
60 T unwrapOrError(Expected<T> EO) {
61   if (!EO)
62     error(EO.takeError());
63   return std::move(*EO);
64 }
65 
66 } // namespace llvm
67 
68 static void reportError(StringRef Input, StringRef Message) {
69   if (Input == "-")
70     Input = "<stdin>";
71   WithColor::error(errs(), Input) << Message << "\n";
72   errs().flush();
73   exit(1);
74 }
75 
76 static void reportError(StringRef Input, std::error_code EC) {
77   reportError(Input, EC.message());
78 }
79 
80 static std::map<SectionRef, SmallVector<SectionRef, 1>> SectionRelocMap;
81 
82 static void collectRelocatedSymbols(const ObjectFile *Obj,
83                                     const SectionRef &Sec, uint64_t SecAddress,
84                                     uint64_t SymAddress, uint64_t SymSize,
85                                     StringRef *I, StringRef *E) {
86   uint64_t SymOffset = SymAddress - SecAddress;
87   uint64_t SymEnd = SymOffset + SymSize;
88   for (const SectionRef &SR : SectionRelocMap[Sec]) {
89     for (const object::RelocationRef &Reloc : SR.relocations()) {
90       if (I == E)
91         break;
92       const object::symbol_iterator RelocSymI = Reloc.getSymbol();
93       if (RelocSymI == Obj->symbol_end())
94         continue;
95       Expected<StringRef> RelocSymName = RelocSymI->getName();
96       error(errorToErrorCode(RelocSymName.takeError()));
97       uint64_t Offset = Reloc.getOffset();
98       if (Offset >= SymOffset && Offset < SymEnd) {
99         *I = *RelocSymName;
100         ++I;
101       }
102     }
103   }
104 }
105 
106 static void collectRelocationOffsets(
107     const ObjectFile *Obj, const SectionRef &Sec, uint64_t SecAddress,
108     uint64_t SymAddress, uint64_t SymSize, StringRef SymName,
109     std::map<std::pair<StringRef, uint64_t>, StringRef> &Collection) {
110   uint64_t SymOffset = SymAddress - SecAddress;
111   uint64_t SymEnd = SymOffset + SymSize;
112   for (const SectionRef &SR : SectionRelocMap[Sec]) {
113     for (const object::RelocationRef &Reloc : SR.relocations()) {
114       const object::symbol_iterator RelocSymI = Reloc.getSymbol();
115       if (RelocSymI == Obj->symbol_end())
116         continue;
117       Expected<StringRef> RelocSymName = RelocSymI->getName();
118       error(errorToErrorCode(RelocSymName.takeError()));
119       uint64_t Offset = Reloc.getOffset();
120       if (Offset >= SymOffset && Offset < SymEnd)
121         Collection[std::make_pair(SymName, Offset - SymOffset)] = *RelocSymName;
122     }
123   }
124 }
125 
126 static void dumpCXXData(const ObjectFile *Obj) {
127   struct CompleteObjectLocator {
128     StringRef Symbols[2];
129     ArrayRef<little32_t> Data;
130   };
131   struct ClassHierarchyDescriptor {
132     StringRef Symbols[1];
133     ArrayRef<little32_t> Data;
134   };
135   struct BaseClassDescriptor {
136     StringRef Symbols[2];
137     ArrayRef<little32_t> Data;
138   };
139   struct TypeDescriptor {
140     StringRef Symbols[1];
141     uint64_t AlwaysZero;
142     StringRef MangledName;
143   };
144   struct ThrowInfo {
145     uint32_t Flags;
146   };
147   struct CatchableTypeArray {
148     uint32_t NumEntries;
149   };
150   struct CatchableType {
151     uint32_t Flags;
152     uint32_t NonVirtualBaseAdjustmentOffset;
153     int32_t VirtualBasePointerOffset;
154     uint32_t VirtualBaseAdjustmentOffset;
155     uint32_t Size;
156     StringRef Symbols[2];
157   };
158   std::map<std::pair<StringRef, uint64_t>, StringRef> VFTableEntries;
159   std::map<std::pair<StringRef, uint64_t>, StringRef> TIEntries;
160   std::map<std::pair<StringRef, uint64_t>, StringRef> CTAEntries;
161   std::map<StringRef, ArrayRef<little32_t>> VBTables;
162   std::map<StringRef, CompleteObjectLocator> COLs;
163   std::map<StringRef, ClassHierarchyDescriptor> CHDs;
164   std::map<std::pair<StringRef, uint64_t>, StringRef> BCAEntries;
165   std::map<StringRef, BaseClassDescriptor> BCDs;
166   std::map<StringRef, TypeDescriptor> TDs;
167   std::map<StringRef, ThrowInfo> TIs;
168   std::map<StringRef, CatchableTypeArray> CTAs;
169   std::map<StringRef, CatchableType> CTs;
170 
171   std::map<std::pair<StringRef, uint64_t>, StringRef> VTableSymEntries;
172   std::map<std::pair<StringRef, uint64_t>, int64_t> VTableDataEntries;
173   std::map<std::pair<StringRef, uint64_t>, StringRef> VTTEntries;
174   std::map<StringRef, StringRef> TINames;
175 
176   SectionRelocMap.clear();
177   for (const SectionRef &Section : Obj->sections()) {
178     Expected<section_iterator> ErrOrSec = Section.getRelocatedSection();
179     if (!ErrOrSec)
180       error(ErrOrSec.takeError());
181 
182     section_iterator Sec2 = *ErrOrSec;
183     if (Sec2 != Obj->section_end())
184       SectionRelocMap[*Sec2].push_back(Section);
185   }
186 
187   uint8_t BytesInAddress = Obj->getBytesInAddress();
188 
189   std::vector<std::pair<SymbolRef, uint64_t>> SymAddr =
190       object::computeSymbolSizes(*Obj);
191 
192   for (auto &P : SymAddr) {
193     object::SymbolRef Sym = P.first;
194     uint64_t SymSize = P.second;
195     Expected<StringRef> SymNameOrErr = Sym.getName();
196     error(errorToErrorCode(SymNameOrErr.takeError()));
197     StringRef SymName = *SymNameOrErr;
198     Expected<object::section_iterator> SecIOrErr = Sym.getSection();
199     error(errorToErrorCode(SecIOrErr.takeError()));
200     object::section_iterator SecI = *SecIOrErr;
201     // Skip external symbols.
202     if (SecI == Obj->section_end())
203       continue;
204     const SectionRef &Sec = *SecI;
205     // Skip virtual or BSS sections.
206     if (Sec.isBSS() || Sec.isVirtual())
207       continue;
208     StringRef SecContents = unwrapOrError(Sec.getContents());
209     Expected<uint64_t> SymAddressOrErr = Sym.getAddress();
210     error(errorToErrorCode(SymAddressOrErr.takeError()));
211     uint64_t SymAddress = *SymAddressOrErr;
212     uint64_t SecAddress = Sec.getAddress();
213     uint64_t SecSize = Sec.getSize();
214     uint64_t SymOffset = SymAddress - SecAddress;
215     StringRef SymContents = SecContents.substr(SymOffset, SymSize);
216 
217     // VFTables in the MS-ABI start with '??_7' and are contained within their
218     // own COMDAT section.  We then determine the contents of the VFTable by
219     // looking at each relocation in the section.
220     if (SymName.startswith("??_7")) {
221       // Each relocation either names a virtual method or a thunk.  We note the
222       // offset into the section and the symbol used for the relocation.
223       collectRelocationOffsets(Obj, Sec, SecAddress, SecAddress, SecSize,
224                                SymName, VFTableEntries);
225     }
226     // VBTables in the MS-ABI start with '??_8' and are filled with 32-bit
227     // offsets of virtual bases.
228     else if (SymName.startswith("??_8")) {
229       ArrayRef<little32_t> VBTableData(
230           reinterpret_cast<const little32_t *>(SymContents.data()),
231           SymContents.size() / sizeof(little32_t));
232       VBTables[SymName] = VBTableData;
233     }
234     // Complete object locators in the MS-ABI start with '??_R4'
235     else if (SymName.startswith("??_R4")) {
236       CompleteObjectLocator COL;
237       COL.Data = makeArrayRef(
238           reinterpret_cast<const little32_t *>(SymContents.data()), 3);
239       StringRef *I = std::begin(COL.Symbols), *E = std::end(COL.Symbols);
240       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
241       COLs[SymName] = COL;
242     }
243     // Class hierarchy descriptors in the MS-ABI start with '??_R3'
244     else if (SymName.startswith("??_R3")) {
245       ClassHierarchyDescriptor CHD;
246       CHD.Data = makeArrayRef(
247           reinterpret_cast<const little32_t *>(SymContents.data()), 3);
248       StringRef *I = std::begin(CHD.Symbols), *E = std::end(CHD.Symbols);
249       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
250       CHDs[SymName] = CHD;
251     }
252     // Class hierarchy descriptors in the MS-ABI start with '??_R2'
253     else if (SymName.startswith("??_R2")) {
254       // Each relocation names a base class descriptor.  We note the offset into
255       // the section and the symbol used for the relocation.
256       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
257                                SymName, BCAEntries);
258     }
259     // Base class descriptors in the MS-ABI start with '??_R1'
260     else if (SymName.startswith("??_R1")) {
261       BaseClassDescriptor BCD;
262       BCD.Data = makeArrayRef(
263           reinterpret_cast<const little32_t *>(SymContents.data()) + 1, 5);
264       StringRef *I = std::begin(BCD.Symbols), *E = std::end(BCD.Symbols);
265       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
266       BCDs[SymName] = BCD;
267     }
268     // Type descriptors in the MS-ABI start with '??_R0'
269     else if (SymName.startswith("??_R0")) {
270       const char *DataPtr = SymContents.drop_front(BytesInAddress).data();
271       TypeDescriptor TD;
272       if (BytesInAddress == 8)
273         TD.AlwaysZero = *reinterpret_cast<const little64_t *>(DataPtr);
274       else
275         TD.AlwaysZero = *reinterpret_cast<const little32_t *>(DataPtr);
276       TD.MangledName = SymContents.drop_front(BytesInAddress * 2);
277       StringRef *I = std::begin(TD.Symbols), *E = std::end(TD.Symbols);
278       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
279       TDs[SymName] = TD;
280     }
281     // Throw descriptors in the MS-ABI start with '_TI'
282     else if (SymName.startswith("_TI") || SymName.startswith("__TI")) {
283       ThrowInfo TI;
284       TI.Flags = *reinterpret_cast<const little32_t *>(SymContents.data());
285       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
286                                SymName, TIEntries);
287       TIs[SymName] = TI;
288     }
289     // Catchable type arrays in the MS-ABI start with _CTA or __CTA.
290     else if (SymName.startswith("_CTA") || SymName.startswith("__CTA")) {
291       CatchableTypeArray CTA;
292       CTA.NumEntries =
293           *reinterpret_cast<const little32_t *>(SymContents.data());
294       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
295                                SymName, CTAEntries);
296       CTAs[SymName] = CTA;
297     }
298     // Catchable types in the MS-ABI start with _CT or __CT.
299     else if (SymName.startswith("_CT") || SymName.startswith("__CT")) {
300       const little32_t *DataPtr =
301           reinterpret_cast<const little32_t *>(SymContents.data());
302       CatchableType CT;
303       CT.Flags = DataPtr[0];
304       CT.NonVirtualBaseAdjustmentOffset = DataPtr[2];
305       CT.VirtualBasePointerOffset = DataPtr[3];
306       CT.VirtualBaseAdjustmentOffset = DataPtr[4];
307       CT.Size = DataPtr[5];
308       StringRef *I = std::begin(CT.Symbols), *E = std::end(CT.Symbols);
309       collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
310       CTs[SymName] = CT;
311     }
312     // Construction vtables in the Itanium ABI start with '_ZTT' or '__ZTT'.
313     else if (SymName.startswith("_ZTT") || SymName.startswith("__ZTT")) {
314       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
315                                SymName, VTTEntries);
316     }
317     // Typeinfo names in the Itanium ABI start with '_ZTS' or '__ZTS'.
318     else if (SymName.startswith("_ZTS") || SymName.startswith("__ZTS")) {
319       TINames[SymName] = SymContents.slice(0, SymContents.find('\0'));
320     }
321     // Vtables in the Itanium ABI start with '_ZTV' or '__ZTV'.
322     else if (SymName.startswith("_ZTV") || SymName.startswith("__ZTV")) {
323       collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
324                                SymName, VTableSymEntries);
325       for (uint64_t SymOffI = 0; SymOffI < SymSize; SymOffI += BytesInAddress) {
326         auto Key = std::make_pair(SymName, SymOffI);
327         if (VTableSymEntries.count(Key))
328           continue;
329         const char *DataPtr =
330             SymContents.substr(SymOffI, BytesInAddress).data();
331         int64_t VData;
332         if (BytesInAddress == 8)
333           VData = *reinterpret_cast<const little64_t *>(DataPtr);
334         else
335           VData = *reinterpret_cast<const little32_t *>(DataPtr);
336         VTableDataEntries[Key] = VData;
337       }
338     }
339     // Typeinfo structures in the Itanium ABI start with '_ZTI' or '__ZTI'.
340     else if (SymName.startswith("_ZTI") || SymName.startswith("__ZTI")) {
341       // FIXME: Do something with these!
342     }
343   }
344   for (const auto &VFTableEntry : VFTableEntries) {
345     StringRef VFTableName = VFTableEntry.first.first;
346     uint64_t Offset = VFTableEntry.first.second;
347     StringRef SymName = VFTableEntry.second;
348     outs() << VFTableName << '[' << Offset << "]: " << SymName << '\n';
349   }
350   for (const auto &VBTable : VBTables) {
351     StringRef VBTableName = VBTable.first;
352     uint32_t Idx = 0;
353     for (little32_t Offset : VBTable.second) {
354       outs() << VBTableName << '[' << Idx << "]: " << Offset << '\n';
355       Idx += sizeof(Offset);
356     }
357   }
358   for (const auto &COLPair : COLs) {
359     StringRef COLName = COLPair.first;
360     const CompleteObjectLocator &COL = COLPair.second;
361     outs() << COLName << "[IsImageRelative]: " << COL.Data[0] << '\n';
362     outs() << COLName << "[OffsetToTop]: " << COL.Data[1] << '\n';
363     outs() << COLName << "[VFPtrOffset]: " << COL.Data[2] << '\n';
364     outs() << COLName << "[TypeDescriptor]: " << COL.Symbols[0] << '\n';
365     outs() << COLName << "[ClassHierarchyDescriptor]: " << COL.Symbols[1]
366            << '\n';
367   }
368   for (const auto &CHDPair : CHDs) {
369     StringRef CHDName = CHDPair.first;
370     const ClassHierarchyDescriptor &CHD = CHDPair.second;
371     outs() << CHDName << "[AlwaysZero]: " << CHD.Data[0] << '\n';
372     outs() << CHDName << "[Flags]: " << CHD.Data[1] << '\n';
373     outs() << CHDName << "[NumClasses]: " << CHD.Data[2] << '\n';
374     outs() << CHDName << "[BaseClassArray]: " << CHD.Symbols[0] << '\n';
375   }
376   for (const auto &BCAEntry : BCAEntries) {
377     StringRef BCAName = BCAEntry.first.first;
378     uint64_t Offset = BCAEntry.first.second;
379     StringRef SymName = BCAEntry.second;
380     outs() << BCAName << '[' << Offset << "]: " << SymName << '\n';
381   }
382   for (const auto &BCDPair : BCDs) {
383     StringRef BCDName = BCDPair.first;
384     const BaseClassDescriptor &BCD = BCDPair.second;
385     outs() << BCDName << "[TypeDescriptor]: " << BCD.Symbols[0] << '\n';
386     outs() << BCDName << "[NumBases]: " << BCD.Data[0] << '\n';
387     outs() << BCDName << "[OffsetInVBase]: " << BCD.Data[1] << '\n';
388     outs() << BCDName << "[VBPtrOffset]: " << BCD.Data[2] << '\n';
389     outs() << BCDName << "[OffsetInVBTable]: " << BCD.Data[3] << '\n';
390     outs() << BCDName << "[Flags]: " << BCD.Data[4] << '\n';
391     outs() << BCDName << "[ClassHierarchyDescriptor]: " << BCD.Symbols[1]
392            << '\n';
393   }
394   for (const auto &TDPair : TDs) {
395     StringRef TDName = TDPair.first;
396     const TypeDescriptor &TD = TDPair.second;
397     outs() << TDName << "[VFPtr]: " << TD.Symbols[0] << '\n';
398     outs() << TDName << "[AlwaysZero]: " << TD.AlwaysZero << '\n';
399     outs() << TDName << "[MangledName]: ";
400     outs().write_escaped(TD.MangledName.rtrim(StringRef("\0", 1)),
401                          /*UseHexEscapes=*/true)
402         << '\n';
403   }
404   for (const auto &TIPair : TIs) {
405     StringRef TIName = TIPair.first;
406     const ThrowInfo &TI = TIPair.second;
407     auto dumpThrowInfoFlag = [&](const char *Name, uint32_t Flag) {
408       outs() << TIName << "[Flags." << Name
409              << "]: " << (TI.Flags & Flag ? "true" : "false") << '\n';
410     };
411     auto dumpThrowInfoSymbol = [&](const char *Name, int Offset) {
412       outs() << TIName << '[' << Name << "]: ";
413       auto Entry = TIEntries.find(std::make_pair(TIName, Offset));
414       outs() << (Entry == TIEntries.end() ? "null" : Entry->second) << '\n';
415     };
416     outs() << TIName << "[Flags]: " << TI.Flags << '\n';
417     dumpThrowInfoFlag("Const", 1);
418     dumpThrowInfoFlag("Volatile", 2);
419     dumpThrowInfoSymbol("CleanupFn", 4);
420     dumpThrowInfoSymbol("ForwardCompat", 8);
421     dumpThrowInfoSymbol("CatchableTypeArray", 12);
422   }
423   for (const auto &CTAPair : CTAs) {
424     StringRef CTAName = CTAPair.first;
425     const CatchableTypeArray &CTA = CTAPair.second;
426 
427     outs() << CTAName << "[NumEntries]: " << CTA.NumEntries << '\n';
428 
429     unsigned Idx = 0;
430     for (auto I = CTAEntries.lower_bound(std::make_pair(CTAName, 0)),
431               E = CTAEntries.upper_bound(std::make_pair(CTAName, UINT64_MAX));
432          I != E; ++I)
433       outs() << CTAName << '[' << Idx++ << "]: " << I->second << '\n';
434   }
435   for (const auto &CTPair : CTs) {
436     StringRef CTName = CTPair.first;
437     const CatchableType &CT = CTPair.second;
438     auto dumpCatchableTypeFlag = [&](const char *Name, uint32_t Flag) {
439       outs() << CTName << "[Flags." << Name
440              << "]: " << (CT.Flags & Flag ? "true" : "false") << '\n';
441     };
442     outs() << CTName << "[Flags]: " << CT.Flags << '\n';
443     dumpCatchableTypeFlag("ScalarType", 1);
444     dumpCatchableTypeFlag("VirtualInheritance", 4);
445     outs() << CTName << "[TypeDescriptor]: " << CT.Symbols[0] << '\n';
446     outs() << CTName << "[NonVirtualBaseAdjustmentOffset]: "
447            << CT.NonVirtualBaseAdjustmentOffset << '\n';
448     outs() << CTName
449            << "[VirtualBasePointerOffset]: " << CT.VirtualBasePointerOffset
450            << '\n';
451     outs() << CTName << "[VirtualBaseAdjustmentOffset]: "
452            << CT.VirtualBaseAdjustmentOffset << '\n';
453     outs() << CTName << "[Size]: " << CT.Size << '\n';
454     outs() << CTName
455            << "[CopyCtor]: " << (CT.Symbols[1].empty() ? "null" : CT.Symbols[1])
456            << '\n';
457   }
458   for (const auto &VTTPair : VTTEntries) {
459     StringRef VTTName = VTTPair.first.first;
460     uint64_t VTTOffset = VTTPair.first.second;
461     StringRef VTTEntry = VTTPair.second;
462     outs() << VTTName << '[' << VTTOffset << "]: " << VTTEntry << '\n';
463   }
464   for (const auto &TIPair : TINames) {
465     StringRef TIName = TIPair.first;
466     outs() << TIName << ": " << TIPair.second << '\n';
467   }
468   auto VTableSymI = VTableSymEntries.begin();
469   auto VTableSymE = VTableSymEntries.end();
470   auto VTableDataI = VTableDataEntries.begin();
471   auto VTableDataE = VTableDataEntries.end();
472   for (;;) {
473     bool SymDone = VTableSymI == VTableSymE;
474     bool DataDone = VTableDataI == VTableDataE;
475     if (SymDone && DataDone)
476       break;
477     if (!SymDone && (DataDone || VTableSymI->first < VTableDataI->first)) {
478       StringRef VTableName = VTableSymI->first.first;
479       uint64_t Offset = VTableSymI->first.second;
480       StringRef VTableEntry = VTableSymI->second;
481       outs() << VTableName << '[' << Offset << "]: ";
482       outs() << VTableEntry;
483       outs() << '\n';
484       ++VTableSymI;
485       continue;
486     }
487     if (!DataDone && (SymDone || VTableDataI->first < VTableSymI->first)) {
488       StringRef VTableName = VTableDataI->first.first;
489       uint64_t Offset = VTableDataI->first.second;
490       int64_t VTableEntry = VTableDataI->second;
491       outs() << VTableName << '[' << Offset << "]: ";
492       outs() << VTableEntry;
493       outs() << '\n';
494       ++VTableDataI;
495       continue;
496     }
497   }
498 }
499 
500 static void dumpArchive(const Archive *Arc) {
501   Error Err = Error::success();
502   for (auto &ArcC : Arc->children(Err)) {
503     Expected<std::unique_ptr<Binary>> ChildOrErr = ArcC.getAsBinary();
504     if (!ChildOrErr) {
505       // Ignore non-object files.
506       if (auto E = isNotObjectErrorInvalidFileType(ChildOrErr.takeError())) {
507         std::string Buf;
508         raw_string_ostream OS(Buf);
509         logAllUnhandledErrors(std::move(E), OS);
510         OS.flush();
511         reportError(Arc->getFileName(), Buf);
512       }
513       consumeError(ChildOrErr.takeError());
514       continue;
515     }
516 
517     if (ObjectFile *Obj = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
518       dumpCXXData(Obj);
519     else
520       reportError(Arc->getFileName(), cxxdump_error::unrecognized_file_format);
521   }
522   if (Err)
523     error(std::move(Err));
524 }
525 
526 static void dumpInput(StringRef File) {
527   // Attempt to open the binary.
528   Expected<OwningBinary<Binary>> BinaryOrErr = createBinary(File);
529   if (!BinaryOrErr) {
530     auto EC = errorToErrorCode(BinaryOrErr.takeError());
531     reportError(File, EC);
532     return;
533   }
534   Binary &Binary = *BinaryOrErr.get().getBinary();
535 
536   if (Archive *Arc = dyn_cast<Archive>(&Binary))
537     dumpArchive(Arc);
538   else if (ObjectFile *Obj = dyn_cast<ObjectFile>(&Binary))
539     dumpCXXData(Obj);
540   else
541     reportError(File, cxxdump_error::unrecognized_file_format);
542 }
543 
544 int main(int argc, const char *argv[]) {
545   InitLLVM X(argc, argv);
546 
547   // Initialize targets.
548   llvm::InitializeAllTargetInfos();
549 
550   // Register the target printer for --version.
551   cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
552 
553   cl::HideUnrelatedOptions({&opts::CXXDumpCategory, &getColorCategory()});
554   cl::ParseCommandLineOptions(argc, argv, "LLVM C++ ABI Data Dumper\n");
555 
556   // Default to stdin if no filename is specified.
557   if (opts::InputFilenames.size() == 0)
558     opts::InputFilenames.push_back("-");
559 
560   llvm::for_each(opts::InputFilenames, dumpInput);
561 
562   return EXIT_SUCCESS;
563 }
564