File: | tools/llvm-dwp/llvm-dwp.cpp |
Warning: | line 145, column 5 Value stored to 'Length' is never read |
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1 | //===-- llvm-dwp.cpp - Split DWARF merging tool for llvm ------------------===// |
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 | // A utility for merging DWARF 5 Split DWARF .dwo files into .dwp (DWARF |
11 | // package files). |
12 | // |
13 | //===----------------------------------------------------------------------===// |
14 | #include "DWPError.h" |
15 | #include "DWPStringPool.h" |
16 | #include "llvm/ADT/MapVector.h" |
17 | #include "llvm/ADT/STLExtras.h" |
18 | #include "llvm/DebugInfo/DWARF/DWARFContext.h" |
19 | #include "llvm/DebugInfo/DWARF/DWARFFormValue.h" |
20 | #include "llvm/DebugInfo/DWARF/DWARFUnitIndex.h" |
21 | #include "llvm/MC/MCAsmBackend.h" |
22 | #include "llvm/MC/MCAsmInfo.h" |
23 | #include "llvm/MC/MCCodeEmitter.h" |
24 | #include "llvm/MC/MCContext.h" |
25 | #include "llvm/MC/MCInstrInfo.h" |
26 | #include "llvm/MC/MCObjectFileInfo.h" |
27 | #include "llvm/MC/MCObjectWriter.h" |
28 | #include "llvm/MC/MCRegisterInfo.h" |
29 | #include "llvm/MC/MCStreamer.h" |
30 | #include "llvm/MC/MCTargetOptionsCommandFlags.inc" |
31 | #include "llvm/Object/Decompressor.h" |
32 | #include "llvm/Object/ObjectFile.h" |
33 | #include "llvm/Support/DataExtractor.h" |
34 | #include "llvm/Support/Error.h" |
35 | #include "llvm/Support/FileSystem.h" |
36 | #include "llvm/Support/InitLLVM.h" |
37 | #include "llvm/Support/MathExtras.h" |
38 | #include "llvm/Support/MemoryBuffer.h" |
39 | #include "llvm/Support/Path.h" |
40 | #include "llvm/Support/TargetRegistry.h" |
41 | #include "llvm/Support/TargetSelect.h" |
42 | #include "llvm/Support/raw_ostream.h" |
43 | |
44 | using namespace llvm; |
45 | using namespace llvm::object; |
46 | |
47 | cl::OptionCategory DwpCategory("Specific Options"); |
48 | static cl::list<std::string> InputFiles(cl::Positional, cl::ZeroOrMore, |
49 | cl::desc("<input files>"), |
50 | cl::cat(DwpCategory)); |
51 | |
52 | static cl::list<std::string> ExecFilenames( |
53 | "e", cl::ZeroOrMore, |
54 | cl::desc("Specify the executable/library files to get the list of *.dwo from"), |
55 | cl::value_desc("filename"), cl::cat(DwpCategory)); |
56 | |
57 | static cl::opt<std::string> OutputFilename(cl::Required, "o", |
58 | cl::desc("Specify the output file."), |
59 | cl::value_desc("filename"), |
60 | cl::cat(DwpCategory)); |
61 | |
62 | static void writeStringsAndOffsets(MCStreamer &Out, DWPStringPool &Strings, |
63 | MCSection *StrOffsetSection, |
64 | StringRef CurStrSection, |
65 | StringRef CurStrOffsetSection) { |
66 | // Could possibly produce an error or warning if one of these was non-null but |
67 | // the other was null. |
68 | if (CurStrSection.empty() || CurStrOffsetSection.empty()) |
69 | return; |
70 | |
71 | DenseMap<uint32_t, uint32_t> OffsetRemapping; |
72 | |
73 | DataExtractor Data(CurStrSection, true, 0); |
74 | uint32_t LocalOffset = 0; |
75 | uint32_t PrevOffset = 0; |
76 | while (const char *s = Data.getCStr(&LocalOffset)) { |
77 | OffsetRemapping[PrevOffset] = |
78 | Strings.getOffset(s, LocalOffset - PrevOffset); |
79 | PrevOffset = LocalOffset; |
80 | } |
81 | |
82 | Data = DataExtractor(CurStrOffsetSection, true, 0); |
83 | |
84 | Out.SwitchSection(StrOffsetSection); |
85 | |
86 | uint32_t Offset = 0; |
87 | uint64_t Size = CurStrOffsetSection.size(); |
88 | while (Offset < Size) { |
89 | auto OldOffset = Data.getU32(&Offset); |
90 | auto NewOffset = OffsetRemapping[OldOffset]; |
91 | Out.EmitIntValue(NewOffset, 4); |
92 | } |
93 | } |
94 | |
95 | static uint32_t getCUAbbrev(StringRef Abbrev, uint64_t AbbrCode) { |
96 | uint64_t CurCode; |
97 | uint32_t Offset = 0; |
98 | DataExtractor AbbrevData(Abbrev, true, 0); |
99 | while ((CurCode = AbbrevData.getULEB128(&Offset)) != AbbrCode) { |
100 | // Tag |
101 | AbbrevData.getULEB128(&Offset); |
102 | // DW_CHILDREN |
103 | AbbrevData.getU8(&Offset); |
104 | // Attributes |
105 | while (AbbrevData.getULEB128(&Offset) | AbbrevData.getULEB128(&Offset)) |
106 | ; |
107 | } |
108 | return Offset; |
109 | } |
110 | |
111 | struct CompileUnitIdentifiers { |
112 | uint64_t Signature = 0; |
113 | const char *Name = ""; |
114 | const char *DWOName = ""; |
115 | }; |
116 | |
117 | static Expected<const char *> |
118 | getIndexedString(dwarf::Form Form, DataExtractor InfoData, |
119 | uint32_t &InfoOffset, StringRef StrOffsets, StringRef Str) { |
120 | if (Form == dwarf::DW_FORM_string) |
121 | return InfoData.getCStr(&InfoOffset); |
122 | if (Form != dwarf::DW_FORM_GNU_str_index) |
123 | return make_error<DWPError>( |
124 | "string field encoded without DW_FORM_string or DW_FORM_GNU_str_index"); |
125 | auto StrIndex = InfoData.getULEB128(&InfoOffset); |
126 | DataExtractor StrOffsetsData(StrOffsets, true, 0); |
127 | uint32_t StrOffsetsOffset = 4 * StrIndex; |
128 | uint32_t StrOffset = StrOffsetsData.getU32(&StrOffsetsOffset); |
129 | DataExtractor StrData(Str, true, 0); |
130 | return StrData.getCStr(&StrOffset); |
131 | } |
132 | |
133 | static Expected<CompileUnitIdentifiers> getCUIdentifiers(StringRef Abbrev, |
134 | StringRef Info, |
135 | StringRef StrOffsets, |
136 | StringRef Str) { |
137 | uint32_t Offset = 0; |
138 | DataExtractor InfoData(Info, true, 0); |
139 | dwarf::DwarfFormat Format = dwarf::DwarfFormat::DWARF32; |
140 | uint64_t Length = InfoData.getU32(&Offset); |
141 | // If the length is 0xffffffff, then this indictes that this is a DWARF 64 |
142 | // stream and the length is actually encoded into a 64 bit value that follows. |
143 | if (Length == 0xffffffffU) { |
144 | Format = dwarf::DwarfFormat::DWARF64; |
145 | Length = InfoData.getU64(&Offset); |
Value stored to 'Length' is never read | |
146 | } |
147 | uint16_t Version = InfoData.getU16(&Offset); |
148 | InfoData.getU32(&Offset); // Abbrev offset (should be zero) |
149 | uint8_t AddrSize = InfoData.getU8(&Offset); |
150 | |
151 | uint32_t AbbrCode = InfoData.getULEB128(&Offset); |
152 | |
153 | DataExtractor AbbrevData(Abbrev, true, 0); |
154 | uint32_t AbbrevOffset = getCUAbbrev(Abbrev, AbbrCode); |
155 | auto Tag = static_cast<dwarf::Tag>(AbbrevData.getULEB128(&AbbrevOffset)); |
156 | if (Tag != dwarf::DW_TAG_compile_unit) |
157 | return make_error<DWPError>("top level DIE is not a compile unit"); |
158 | // DW_CHILDREN |
159 | AbbrevData.getU8(&AbbrevOffset); |
160 | uint32_t Name; |
161 | dwarf::Form Form; |
162 | CompileUnitIdentifiers ID; |
163 | while ((Name = AbbrevData.getULEB128(&AbbrevOffset)) | |
164 | (Form = static_cast<dwarf::Form>(AbbrevData.getULEB128(&AbbrevOffset))) && |
165 | (Name != 0 || Form != 0)) { |
166 | switch (Name) { |
167 | case dwarf::DW_AT_name: { |
168 | Expected<const char *> EName = |
169 | getIndexedString(Form, InfoData, Offset, StrOffsets, Str); |
170 | if (!EName) |
171 | return EName.takeError(); |
172 | ID.Name = *EName; |
173 | break; |
174 | } |
175 | case dwarf::DW_AT_GNU_dwo_name: { |
176 | Expected<const char *> EName = |
177 | getIndexedString(Form, InfoData, Offset, StrOffsets, Str); |
178 | if (!EName) |
179 | return EName.takeError(); |
180 | ID.DWOName = *EName; |
181 | break; |
182 | } |
183 | case dwarf::DW_AT_GNU_dwo_id: |
184 | ID.Signature = InfoData.getU64(&Offset); |
185 | break; |
186 | default: |
187 | DWARFFormValue::skipValue(Form, InfoData, &Offset, |
188 | dwarf::FormParams({Version, AddrSize, Format})); |
189 | } |
190 | } |
191 | return ID; |
192 | } |
193 | |
194 | struct UnitIndexEntry { |
195 | DWARFUnitIndex::Entry::SectionContribution Contributions[8]; |
196 | std::string Name; |
197 | std::string DWOName; |
198 | StringRef DWPName; |
199 | }; |
200 | |
201 | static StringRef getSubsection(StringRef Section, |
202 | const DWARFUnitIndex::Entry &Entry, |
203 | DWARFSectionKind Kind) { |
204 | const auto *Off = Entry.getOffset(Kind); |
205 | if (!Off) |
206 | return StringRef(); |
207 | return Section.substr(Off->Offset, Off->Length); |
208 | } |
209 | |
210 | static void addAllTypesFromDWP( |
211 | MCStreamer &Out, MapVector<uint64_t, UnitIndexEntry> &TypeIndexEntries, |
212 | const DWARFUnitIndex &TUIndex, MCSection *OutputTypes, StringRef Types, |
213 | const UnitIndexEntry &TUEntry, uint32_t &TypesOffset) { |
214 | Out.SwitchSection(OutputTypes); |
215 | for (const DWARFUnitIndex::Entry &E : TUIndex.getRows()) { |
216 | auto *I = E.getOffsets(); |
217 | if (!I) |
218 | continue; |
219 | auto P = TypeIndexEntries.insert(std::make_pair(E.getSignature(), TUEntry)); |
220 | if (!P.second) |
221 | continue; |
222 | auto &Entry = P.first->second; |
223 | // Zero out the debug_info contribution |
224 | Entry.Contributions[0] = {}; |
225 | for (auto Kind : TUIndex.getColumnKinds()) { |
226 | auto &C = Entry.Contributions[Kind - DW_SECT_INFO]; |
227 | C.Offset += I->Offset; |
228 | C.Length = I->Length; |
229 | ++I; |
230 | } |
231 | auto &C = Entry.Contributions[DW_SECT_TYPES - DW_SECT_INFO]; |
232 | Out.EmitBytes(Types.substr( |
233 | C.Offset - TUEntry.Contributions[DW_SECT_TYPES - DW_SECT_INFO].Offset, |
234 | C.Length)); |
235 | C.Offset = TypesOffset; |
236 | TypesOffset += C.Length; |
237 | } |
238 | } |
239 | |
240 | static void addAllTypes(MCStreamer &Out, |
241 | MapVector<uint64_t, UnitIndexEntry> &TypeIndexEntries, |
242 | MCSection *OutputTypes, |
243 | const std::vector<StringRef> &TypesSections, |
244 | const UnitIndexEntry &CUEntry, uint32_t &TypesOffset) { |
245 | for (StringRef Types : TypesSections) { |
246 | Out.SwitchSection(OutputTypes); |
247 | uint32_t Offset = 0; |
248 | DataExtractor Data(Types, true, 0); |
249 | while (Data.isValidOffset(Offset)) { |
250 | UnitIndexEntry Entry = CUEntry; |
251 | // Zero out the debug_info contribution |
252 | Entry.Contributions[0] = {}; |
253 | auto &C = Entry.Contributions[DW_SECT_TYPES - DW_SECT_INFO]; |
254 | C.Offset = TypesOffset; |
255 | auto PrevOffset = Offset; |
256 | // Length of the unit, including the 4 byte length field. |
257 | C.Length = Data.getU32(&Offset) + 4; |
258 | |
259 | Data.getU16(&Offset); // Version |
260 | Data.getU32(&Offset); // Abbrev offset |
261 | Data.getU8(&Offset); // Address size |
262 | auto Signature = Data.getU64(&Offset); |
263 | Offset = PrevOffset + C.Length; |
264 | |
265 | auto P = TypeIndexEntries.insert(std::make_pair(Signature, Entry)); |
266 | if (!P.second) |
267 | continue; |
268 | |
269 | Out.EmitBytes(Types.substr(PrevOffset, C.Length)); |
270 | TypesOffset += C.Length; |
271 | } |
272 | } |
273 | } |
274 | |
275 | static void |
276 | writeIndexTable(MCStreamer &Out, ArrayRef<unsigned> ContributionOffsets, |
277 | const MapVector<uint64_t, UnitIndexEntry> &IndexEntries, |
278 | uint32_t DWARFUnitIndex::Entry::SectionContribution::*Field) { |
279 | for (const auto &E : IndexEntries) |
280 | for (size_t i = 0; i != array_lengthof(E.second.Contributions); ++i) |
281 | if (ContributionOffsets[i]) |
282 | Out.EmitIntValue(E.second.Contributions[i].*Field, 4); |
283 | } |
284 | |
285 | static void |
286 | writeIndex(MCStreamer &Out, MCSection *Section, |
287 | ArrayRef<unsigned> ContributionOffsets, |
288 | const MapVector<uint64_t, UnitIndexEntry> &IndexEntries) { |
289 | if (IndexEntries.empty()) |
290 | return; |
291 | |
292 | unsigned Columns = 0; |
293 | for (auto &C : ContributionOffsets) |
294 | if (C) |
295 | ++Columns; |
296 | |
297 | std::vector<unsigned> Buckets(NextPowerOf2(3 * IndexEntries.size() / 2)); |
298 | uint64_t Mask = Buckets.size() - 1; |
299 | size_t i = 0; |
300 | for (const auto &P : IndexEntries) { |
301 | auto S = P.first; |
302 | auto H = S & Mask; |
303 | auto HP = ((S >> 32) & Mask) | 1; |
304 | while (Buckets[H]) { |
305 | assert(S != IndexEntries.begin()[Buckets[H] - 1].first &&((S != IndexEntries.begin()[Buckets[H] - 1].first && "Duplicate unit" ) ? static_cast<void> (0) : __assert_fail ("S != IndexEntries.begin()[Buckets[H] - 1].first && \"Duplicate unit\"" , "/build/llvm-toolchain-snapshot-8~svn345461/tools/llvm-dwp/llvm-dwp.cpp" , 306, __PRETTY_FUNCTION__)) |
306 | "Duplicate unit")((S != IndexEntries.begin()[Buckets[H] - 1].first && "Duplicate unit" ) ? static_cast<void> (0) : __assert_fail ("S != IndexEntries.begin()[Buckets[H] - 1].first && \"Duplicate unit\"" , "/build/llvm-toolchain-snapshot-8~svn345461/tools/llvm-dwp/llvm-dwp.cpp" , 306, __PRETTY_FUNCTION__)); |
307 | H = (H + HP) & Mask; |
308 | } |
309 | Buckets[H] = i + 1; |
310 | ++i; |
311 | } |
312 | |
313 | Out.SwitchSection(Section); |
314 | Out.EmitIntValue(2, 4); // Version |
315 | Out.EmitIntValue(Columns, 4); // Columns |
316 | Out.EmitIntValue(IndexEntries.size(), 4); // Num Units |
317 | Out.EmitIntValue(Buckets.size(), 4); // Num Buckets |
318 | |
319 | // Write the signatures. |
320 | for (const auto &I : Buckets) |
321 | Out.EmitIntValue(I ? IndexEntries.begin()[I - 1].first : 0, 8); |
322 | |
323 | // Write the indexes. |
324 | for (const auto &I : Buckets) |
325 | Out.EmitIntValue(I, 4); |
326 | |
327 | // Write the column headers (which sections will appear in the table) |
328 | for (size_t i = 0; i != ContributionOffsets.size(); ++i) |
329 | if (ContributionOffsets[i]) |
330 | Out.EmitIntValue(i + DW_SECT_INFO, 4); |
331 | |
332 | // Write the offsets. |
333 | writeIndexTable(Out, ContributionOffsets, IndexEntries, |
334 | &DWARFUnitIndex::Entry::SectionContribution::Offset); |
335 | |
336 | // Write the lengths. |
337 | writeIndexTable(Out, ContributionOffsets, IndexEntries, |
338 | &DWARFUnitIndex::Entry::SectionContribution::Length); |
339 | } |
340 | |
341 | std::string buildDWODescription(StringRef Name, StringRef DWPName, StringRef DWOName) { |
342 | std::string Text = "\'"; |
343 | Text += Name; |
344 | Text += '\''; |
345 | if (!DWPName.empty()) { |
346 | Text += " (from "; |
347 | if (!DWOName.empty()) { |
348 | Text += '\''; |
349 | Text += DWOName; |
350 | Text += "' in "; |
351 | } |
352 | Text += '\''; |
353 | Text += DWPName; |
354 | Text += "')"; |
355 | } |
356 | return Text; |
357 | } |
358 | |
359 | static Error createError(StringRef Name, Error E) { |
360 | return make_error<DWPError>( |
361 | ("failure while decompressing compressed section: '" + Name + "', " + |
362 | llvm::toString(std::move(E))) |
363 | .str()); |
364 | } |
365 | |
366 | static Error |
367 | handleCompressedSection(std::deque<SmallString<32>> &UncompressedSections, |
368 | StringRef &Name, StringRef &Contents) { |
369 | if (!Decompressor::isGnuStyle(Name)) |
370 | return Error::success(); |
371 | |
372 | Expected<Decompressor> Dec = |
373 | Decompressor::create(Name, Contents, false /*IsLE*/, false /*Is64Bit*/); |
374 | if (!Dec) |
375 | return createError(Name, Dec.takeError()); |
376 | |
377 | UncompressedSections.emplace_back(); |
378 | if (Error E = Dec->resizeAndDecompress(UncompressedSections.back())) |
379 | return createError(Name, std::move(E)); |
380 | |
381 | Name = Name.substr(2); // Drop ".z" |
382 | Contents = UncompressedSections.back(); |
383 | return Error::success(); |
384 | } |
385 | |
386 | static Error handleSection( |
387 | const StringMap<std::pair<MCSection *, DWARFSectionKind>> &KnownSections, |
388 | const MCSection *StrSection, const MCSection *StrOffsetSection, |
389 | const MCSection *TypesSection, const MCSection *CUIndexSection, |
390 | const MCSection *TUIndexSection, const SectionRef &Section, MCStreamer &Out, |
391 | std::deque<SmallString<32>> &UncompressedSections, |
392 | uint32_t (&ContributionOffsets)[8], UnitIndexEntry &CurEntry, |
393 | StringRef &CurStrSection, StringRef &CurStrOffsetSection, |
394 | std::vector<StringRef> &CurTypesSection, StringRef &InfoSection, |
395 | StringRef &AbbrevSection, StringRef &CurCUIndexSection, |
396 | StringRef &CurTUIndexSection) { |
397 | if (Section.isBSS()) |
398 | return Error::success(); |
399 | |
400 | if (Section.isVirtual()) |
401 | return Error::success(); |
402 | |
403 | StringRef Name; |
404 | if (std::error_code Err = Section.getName(Name)) |
405 | return errorCodeToError(Err); |
406 | |
407 | StringRef Contents; |
408 | if (auto Err = Section.getContents(Contents)) |
409 | return errorCodeToError(Err); |
410 | |
411 | if (auto Err = handleCompressedSection(UncompressedSections, Name, Contents)) |
412 | return Err; |
413 | |
414 | Name = Name.substr(Name.find_first_not_of("._")); |
415 | |
416 | auto SectionPair = KnownSections.find(Name); |
417 | if (SectionPair == KnownSections.end()) |
418 | return Error::success(); |
419 | |
420 | if (DWARFSectionKind Kind = SectionPair->second.second) { |
421 | auto Index = Kind - DW_SECT_INFO; |
422 | if (Kind != DW_SECT_TYPES) { |
423 | CurEntry.Contributions[Index].Offset = ContributionOffsets[Index]; |
424 | ContributionOffsets[Index] += |
425 | (CurEntry.Contributions[Index].Length = Contents.size()); |
426 | } |
427 | |
428 | switch (Kind) { |
429 | case DW_SECT_INFO: |
430 | InfoSection = Contents; |
431 | break; |
432 | case DW_SECT_ABBREV: |
433 | AbbrevSection = Contents; |
434 | break; |
435 | default: |
436 | break; |
437 | } |
438 | } |
439 | |
440 | MCSection *OutSection = SectionPair->second.first; |
441 | if (OutSection == StrOffsetSection) |
442 | CurStrOffsetSection = Contents; |
443 | else if (OutSection == StrSection) |
444 | CurStrSection = Contents; |
445 | else if (OutSection == TypesSection) |
446 | CurTypesSection.push_back(Contents); |
447 | else if (OutSection == CUIndexSection) |
448 | CurCUIndexSection = Contents; |
449 | else if (OutSection == TUIndexSection) |
450 | CurTUIndexSection = Contents; |
451 | else { |
452 | Out.SwitchSection(OutSection); |
453 | Out.EmitBytes(Contents); |
454 | } |
455 | return Error::success(); |
456 | } |
457 | |
458 | static Error |
459 | buildDuplicateError(const std::pair<uint64_t, UnitIndexEntry> &PrevE, |
460 | const CompileUnitIdentifiers &ID, StringRef DWPName) { |
461 | return make_error<DWPError>( |
462 | std::string("Duplicate DWO ID (") + utohexstr(PrevE.first) + ") in " + |
463 | buildDWODescription(PrevE.second.Name, PrevE.second.DWPName, |
464 | PrevE.second.DWOName) + |
465 | " and " + buildDWODescription(ID.Name, DWPName, ID.DWOName)); |
466 | } |
467 | |
468 | static Expected<SmallVector<std::string, 16>> |
469 | getDWOFilenames(StringRef ExecFilename) { |
470 | auto ErrOrObj = object::ObjectFile::createObjectFile(ExecFilename); |
471 | if (!ErrOrObj) |
472 | return ErrOrObj.takeError(); |
473 | |
474 | const ObjectFile &Obj = *ErrOrObj.get().getBinary(); |
475 | std::unique_ptr<DWARFContext> DWARFCtx = DWARFContext::create(Obj); |
476 | |
477 | SmallVector<std::string, 16> DWOPaths; |
478 | for (const auto &CU : DWARFCtx->compile_units()) { |
479 | const DWARFDie &Die = CU->getUnitDIE(); |
480 | std::string DWOName = dwarf::toString( |
481 | Die.find({dwarf::DW_AT_dwo_name, dwarf::DW_AT_GNU_dwo_name}), ""); |
482 | if (DWOName.empty()) |
483 | continue; |
484 | std::string DWOCompDir = |
485 | dwarf::toString(Die.find(dwarf::DW_AT_comp_dir), ""); |
486 | if (!DWOCompDir.empty()) { |
487 | SmallString<16> DWOPath; |
488 | sys::path::append(DWOPath, DWOCompDir, DWOName); |
489 | DWOPaths.emplace_back(DWOPath.data(), DWOPath.size()); |
490 | } else { |
491 | DWOPaths.push_back(std::move(DWOName)); |
492 | } |
493 | } |
494 | return std::move(DWOPaths); |
495 | } |
496 | |
497 | static Error write(MCStreamer &Out, ArrayRef<std::string> Inputs) { |
498 | const auto &MCOFI = *Out.getContext().getObjectFileInfo(); |
499 | MCSection *const StrSection = MCOFI.getDwarfStrDWOSection(); |
500 | MCSection *const StrOffsetSection = MCOFI.getDwarfStrOffDWOSection(); |
501 | MCSection *const TypesSection = MCOFI.getDwarfTypesDWOSection(); |
502 | MCSection *const CUIndexSection = MCOFI.getDwarfCUIndexSection(); |
503 | MCSection *const TUIndexSection = MCOFI.getDwarfTUIndexSection(); |
504 | const StringMap<std::pair<MCSection *, DWARFSectionKind>> KnownSections = { |
505 | {"debug_info.dwo", {MCOFI.getDwarfInfoDWOSection(), DW_SECT_INFO}}, |
506 | {"debug_types.dwo", {MCOFI.getDwarfTypesDWOSection(), DW_SECT_TYPES}}, |
507 | {"debug_str_offsets.dwo", {StrOffsetSection, DW_SECT_STR_OFFSETS}}, |
508 | {"debug_str.dwo", {StrSection, static_cast<DWARFSectionKind>(0)}}, |
509 | {"debug_loc.dwo", {MCOFI.getDwarfLocDWOSection(), DW_SECT_LOC}}, |
510 | {"debug_line.dwo", {MCOFI.getDwarfLineDWOSection(), DW_SECT_LINE}}, |
511 | {"debug_abbrev.dwo", {MCOFI.getDwarfAbbrevDWOSection(), DW_SECT_ABBREV}}, |
512 | {"debug_cu_index", {CUIndexSection, static_cast<DWARFSectionKind>(0)}}, |
513 | {"debug_tu_index", {TUIndexSection, static_cast<DWARFSectionKind>(0)}}}; |
514 | |
515 | MapVector<uint64_t, UnitIndexEntry> IndexEntries; |
516 | MapVector<uint64_t, UnitIndexEntry> TypeIndexEntries; |
517 | |
518 | uint32_t ContributionOffsets[8] = {}; |
519 | |
520 | DWPStringPool Strings(Out, StrSection); |
521 | |
522 | SmallVector<OwningBinary<object::ObjectFile>, 128> Objects; |
523 | Objects.reserve(Inputs.size()); |
524 | |
525 | std::deque<SmallString<32>> UncompressedSections; |
526 | |
527 | for (const auto &Input : Inputs) { |
528 | auto ErrOrObj = object::ObjectFile::createObjectFile(Input); |
529 | if (!ErrOrObj) |
530 | return ErrOrObj.takeError(); |
531 | |
532 | auto &Obj = *ErrOrObj->getBinary(); |
533 | Objects.push_back(std::move(*ErrOrObj)); |
534 | |
535 | UnitIndexEntry CurEntry = {}; |
536 | |
537 | StringRef CurStrSection; |
538 | StringRef CurStrOffsetSection; |
539 | std::vector<StringRef> CurTypesSection; |
540 | StringRef InfoSection; |
541 | StringRef AbbrevSection; |
542 | StringRef CurCUIndexSection; |
543 | StringRef CurTUIndexSection; |
544 | |
545 | for (const auto &Section : Obj.sections()) |
546 | if (auto Err = handleSection( |
547 | KnownSections, StrSection, StrOffsetSection, TypesSection, |
548 | CUIndexSection, TUIndexSection, Section, Out, |
549 | UncompressedSections, ContributionOffsets, CurEntry, |
550 | CurStrSection, CurStrOffsetSection, CurTypesSection, InfoSection, |
551 | AbbrevSection, CurCUIndexSection, CurTUIndexSection)) |
552 | return Err; |
553 | |
554 | if (InfoSection.empty()) |
555 | continue; |
556 | |
557 | writeStringsAndOffsets(Out, Strings, StrOffsetSection, CurStrSection, |
558 | CurStrOffsetSection); |
559 | |
560 | if (CurCUIndexSection.empty()) { |
561 | Expected<CompileUnitIdentifiers> EID = getCUIdentifiers( |
562 | AbbrevSection, InfoSection, CurStrOffsetSection, CurStrSection); |
563 | if (!EID) |
564 | return EID.takeError(); |
565 | const auto &ID = *EID; |
566 | auto P = IndexEntries.insert(std::make_pair(ID.Signature, CurEntry)); |
567 | if (!P.second) |
568 | return buildDuplicateError(*P.first, ID, ""); |
569 | P.first->second.Name = ID.Name; |
570 | P.first->second.DWOName = ID.DWOName; |
571 | addAllTypes(Out, TypeIndexEntries, TypesSection, CurTypesSection, |
572 | CurEntry, ContributionOffsets[DW_SECT_TYPES - DW_SECT_INFO]); |
573 | continue; |
574 | } |
575 | |
576 | DWARFUnitIndex CUIndex(DW_SECT_INFO); |
577 | DataExtractor CUIndexData(CurCUIndexSection, Obj.isLittleEndian(), 0); |
578 | if (!CUIndex.parse(CUIndexData)) |
579 | return make_error<DWPError>("Failed to parse cu_index"); |
580 | |
581 | for (const DWARFUnitIndex::Entry &E : CUIndex.getRows()) { |
582 | auto *I = E.getOffsets(); |
583 | if (!I) |
584 | continue; |
585 | auto P = IndexEntries.insert(std::make_pair(E.getSignature(), CurEntry)); |
586 | Expected<CompileUnitIdentifiers> EID = getCUIdentifiers( |
587 | getSubsection(AbbrevSection, E, DW_SECT_ABBREV), |
588 | getSubsection(InfoSection, E, DW_SECT_INFO), |
589 | getSubsection(CurStrOffsetSection, E, DW_SECT_STR_OFFSETS), |
590 | CurStrSection); |
591 | if (!EID) |
592 | return EID.takeError(); |
593 | const auto &ID = *EID; |
594 | if (!P.second) |
595 | return buildDuplicateError(*P.first, ID, Input); |
596 | auto &NewEntry = P.first->second; |
597 | NewEntry.Name = ID.Name; |
598 | NewEntry.DWOName = ID.DWOName; |
599 | NewEntry.DWPName = Input; |
600 | for (auto Kind : CUIndex.getColumnKinds()) { |
601 | auto &C = NewEntry.Contributions[Kind - DW_SECT_INFO]; |
602 | C.Offset += I->Offset; |
603 | C.Length = I->Length; |
604 | ++I; |
605 | } |
606 | } |
607 | |
608 | if (!CurTypesSection.empty()) { |
609 | if (CurTypesSection.size() != 1) |
610 | return make_error<DWPError>("multiple type unit sections in .dwp file"); |
611 | DWARFUnitIndex TUIndex(DW_SECT_TYPES); |
612 | DataExtractor TUIndexData(CurTUIndexSection, Obj.isLittleEndian(), 0); |
613 | if (!TUIndex.parse(TUIndexData)) |
614 | return make_error<DWPError>("Failed to parse tu_index"); |
615 | addAllTypesFromDWP(Out, TypeIndexEntries, TUIndex, TypesSection, |
616 | CurTypesSection.front(), CurEntry, |
617 | ContributionOffsets[DW_SECT_TYPES - DW_SECT_INFO]); |
618 | } |
619 | } |
620 | |
621 | // Lie about there being no info contributions so the TU index only includes |
622 | // the type unit contribution |
623 | ContributionOffsets[0] = 0; |
624 | writeIndex(Out, MCOFI.getDwarfTUIndexSection(), ContributionOffsets, |
625 | TypeIndexEntries); |
626 | |
627 | // Lie about the type contribution |
628 | ContributionOffsets[DW_SECT_TYPES - DW_SECT_INFO] = 0; |
629 | // Unlie about the info contribution |
630 | ContributionOffsets[0] = 1; |
631 | |
632 | writeIndex(Out, MCOFI.getDwarfCUIndexSection(), ContributionOffsets, |
633 | IndexEntries); |
634 | |
635 | return Error::success(); |
636 | } |
637 | |
638 | static int error(const Twine &Error, const Twine &Context) { |
639 | errs() << Twine("while processing ") + Context + ":\n"; |
640 | errs() << Twine("error: ") + Error + "\n"; |
641 | return 1; |
642 | } |
643 | |
644 | int main(int argc, char **argv) { |
645 | InitLLVM X(argc, argv); |
646 | |
647 | cl::ParseCommandLineOptions(argc, argv, "merge split dwarf (.dwo) files\n"); |
648 | |
649 | llvm::InitializeAllTargetInfos(); |
650 | llvm::InitializeAllTargetMCs(); |
651 | llvm::InitializeAllTargets(); |
652 | llvm::InitializeAllAsmPrinters(); |
653 | |
654 | std::string ErrorStr; |
655 | StringRef Context = "dwarf streamer init"; |
656 | |
657 | Triple TheTriple("x86_64-linux-gnu"); |
658 | |
659 | // Get the target. |
660 | const Target *TheTarget = |
661 | TargetRegistry::lookupTarget("", TheTriple, ErrorStr); |
662 | if (!TheTarget) |
663 | return error(ErrorStr, Context); |
664 | std::string TripleName = TheTriple.getTriple(); |
665 | |
666 | // Create all the MC Objects. |
667 | std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName)); |
668 | if (!MRI) |
669 | return error(Twine("no register info for target ") + TripleName, Context); |
670 | |
671 | std::unique_ptr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*MRI, TripleName)); |
672 | if (!MAI) |
673 | return error("no asm info for target " + TripleName, Context); |
674 | |
675 | MCObjectFileInfo MOFI; |
676 | MCContext MC(MAI.get(), MRI.get(), &MOFI); |
677 | MOFI.InitMCObjectFileInfo(TheTriple, /*PIC*/ false, MC); |
678 | |
679 | std::unique_ptr<MCSubtargetInfo> MSTI( |
680 | TheTarget->createMCSubtargetInfo(TripleName, "", "")); |
681 | if (!MSTI) |
682 | return error("no subtarget info for target " + TripleName, Context); |
683 | |
684 | MCTargetOptions Options; |
685 | auto MAB = TheTarget->createMCAsmBackend(*MSTI, *MRI, Options); |
686 | if (!MAB) |
687 | return error("no asm backend for target " + TripleName, Context); |
688 | |
689 | std::unique_ptr<MCInstrInfo> MII(TheTarget->createMCInstrInfo()); |
690 | if (!MII) |
691 | return error("no instr info info for target " + TripleName, Context); |
692 | |
693 | MCCodeEmitter *MCE = TheTarget->createMCCodeEmitter(*MII, *MRI, MC); |
694 | if (!MCE) |
695 | return error("no code emitter for target " + TripleName, Context); |
696 | |
697 | // Create the output file. |
698 | std::error_code EC; |
699 | raw_fd_ostream OutFile(OutputFilename, EC, sys::fs::F_None); |
700 | Optional<buffer_ostream> BOS; |
701 | raw_pwrite_stream *OS; |
702 | if (EC) |
703 | return error(Twine(OutputFilename) + ": " + EC.message(), Context); |
704 | if (OutFile.supportsSeeking()) { |
705 | OS = &OutFile; |
706 | } else { |
707 | BOS.emplace(OutFile); |
708 | OS = BOS.getPointer(); |
709 | } |
710 | |
711 | MCTargetOptions MCOptions = InitMCTargetOptionsFromFlags(); |
712 | std::unique_ptr<MCStreamer> MS(TheTarget->createMCObjectStreamer( |
713 | TheTriple, MC, std::unique_ptr<MCAsmBackend>(MAB), |
714 | MAB->createObjectWriter(*OS), std::unique_ptr<MCCodeEmitter>(MCE), |
715 | *MSTI, MCOptions.MCRelaxAll, MCOptions.MCIncrementalLinkerCompatible, |
716 | /*DWARFMustBeAtTheEnd*/ false)); |
717 | if (!MS) |
718 | return error("no object streamer for target " + TripleName, Context); |
719 | |
720 | std::vector<std::string> DWOFilenames = InputFiles; |
721 | for (const auto &ExecFilename : ExecFilenames) { |
722 | auto DWOs = getDWOFilenames(ExecFilename); |
723 | if (!DWOs) { |
724 | logAllUnhandledErrors(DWOs.takeError(), errs(), "error: "); |
725 | return 1; |
726 | } |
727 | DWOFilenames.insert(DWOFilenames.end(), |
728 | std::make_move_iterator(DWOs->begin()), |
729 | std::make_move_iterator(DWOs->end())); |
730 | } |
731 | |
732 | if (auto Err = write(*MS, DWOFilenames)) { |
733 | logAllUnhandledErrors(std::move(Err), errs(), "error: "); |
734 | return 1; |
735 | } |
736 | |
737 | MS->Finish(); |
738 | } |