1//===- DwarfStreamer.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 "llvm/DWARFLinker/Classic/DWARFStreamer.h"
10#include "llvm/CodeGen/NonRelocatableStringpool.h"
11#include "llvm/DWARFLinker/Classic/DWARFLinkerCompileUnit.h"
12#include "llvm/DebugInfo/DWARF/DWARFContext.h"
13#include "llvm/DebugInfo/DWARF/DWARFDebugMacro.h"
14#include "llvm/MC/MCAsmBackend.h"
15#include "llvm/MC/MCCodeEmitter.h"
16#include "llvm/MC/MCDwarf.h"
17#include "llvm/MC/MCObjectWriter.h"
18#include "llvm/MC/MCSection.h"
19#include "llvm/MC/MCStreamer.h"
20#include "llvm/MC/MCSubtargetInfo.h"
21#include "llvm/MC/MCTargetOptions.h"
22#include "llvm/MC/MCTargetOptionsCommandFlags.h"
23#include "llvm/MC/TargetRegistry.h"
24#include "llvm/Support/FormatVariadic.h"
25#include "llvm/Support/LEB128.h"
26#include "llvm/Target/TargetOptions.h"
27#include "llvm/TargetParser/Triple.h"
28
29using namespace llvm;
30using namespace dwarf_linker;
31using namespace dwarf_linker::classic;
32
33Expected<std::unique_ptr<DwarfStreamer>> DwarfStreamer::createStreamer(
34 const Triple &TheTriple, DWARFLinkerBase::OutputFileType FileType,
35 raw_pwrite_stream &OutFile, DWARFLinkerBase::MessageHandlerTy Warning) {
36 std::unique_ptr<DwarfStreamer> Streamer =
37 std::make_unique<DwarfStreamer>(args&: FileType, args&: OutFile, args&: Warning);
38 if (Error Err = Streamer->init(TheTriple, Swift5ReflectionSegmentName: "__DWARF"))
39 return std::move(Err);
40
41 return std::move(Streamer);
42}
43
44Error DwarfStreamer::init(Triple TheTriple,
45 StringRef Swift5ReflectionSegmentName) {
46 std::string ErrorStr;
47 std::string TripleName;
48
49 // Get the target.
50 const Target *TheTarget =
51 TargetRegistry::lookupTarget(ArchName: TripleName, TheTriple, Error&: ErrorStr);
52 if (!TheTarget)
53 return createStringError(EC: std::errc::invalid_argument, Fmt: ErrorStr.c_str());
54
55 TripleName = TheTriple.getTriple();
56
57 // Create all the MC Objects.
58 MRI.reset(p: TheTarget->createMCRegInfo(TT: TripleName));
59 if (!MRI)
60 return createStringError(EC: std::errc::invalid_argument,
61 Fmt: "no register info for target %s",
62 Vals: TripleName.c_str());
63
64 MCTargetOptions MCOptions = mc::InitMCTargetOptionsFromFlags();
65 MCOptions.AsmVerbose = true;
66 MCOptions.MCUseDwarfDirectory = MCTargetOptions::EnableDwarfDirectory;
67 MAI.reset(p: TheTarget->createMCAsmInfo(MRI: *MRI, TheTriple: TripleName, Options: MCOptions));
68 if (!MAI)
69 return createStringError(EC: std::errc::invalid_argument,
70 Fmt: "no asm info for target %s", Vals: TripleName.c_str());
71
72 MSTI.reset(p: TheTarget->createMCSubtargetInfo(TheTriple: TripleName, CPU: "", Features: ""));
73 if (!MSTI)
74 return createStringError(EC: std::errc::invalid_argument,
75 Fmt: "no subtarget info for target %s",
76 Vals: TripleName.c_str());
77
78 MC.reset(p: new MCContext(TheTriple, MAI.get(), MRI.get(), MSTI.get(), nullptr,
79 nullptr, true, Swift5ReflectionSegmentName));
80 MOFI.reset(p: TheTarget->createMCObjectFileInfo(Ctx&: *MC, /*PIC=*/false, LargeCodeModel: false));
81 MC->setObjectFileInfo(MOFI.get());
82
83 MAB = TheTarget->createMCAsmBackend(STI: *MSTI, MRI: *MRI, Options: MCOptions);
84 if (!MAB)
85 return createStringError(EC: std::errc::invalid_argument,
86 Fmt: "no asm backend for target %s",
87 Vals: TripleName.c_str());
88
89 MII.reset(p: TheTarget->createMCInstrInfo());
90 if (!MII)
91 return createStringError(EC: std::errc::invalid_argument,
92 Fmt: "no instr info info for target %s",
93 Vals: TripleName.c_str());
94
95 MCE = TheTarget->createMCCodeEmitter(II: *MII, Ctx&: *MC);
96 if (!MCE)
97 return createStringError(EC: std::errc::invalid_argument,
98 Fmt: "no code emitter for target %s",
99 Vals: TripleName.c_str());
100
101 switch (OutFileType) {
102 case DWARFLinker::OutputFileType::Assembly: {
103 MIP = TheTarget->createMCInstPrinter(T: TheTriple, SyntaxVariant: MAI->getAssemblerDialect(),
104 MAI: *MAI, MII: *MII, MRI: *MRI);
105 MS = TheTarget->createAsmStreamer(
106 Ctx&: *MC, OS: std::make_unique<formatted_raw_ostream>(args&: OutFile), IP: MIP,
107 CE: std::unique_ptr<MCCodeEmitter>(MCE),
108 TAB: std::unique_ptr<MCAsmBackend>(MAB));
109 break;
110 }
111 case DWARFLinker::OutputFileType::Object: {
112 MS = TheTarget->createMCObjectStreamer(
113 T: TheTriple, Ctx&: *MC, TAB: std::unique_ptr<MCAsmBackend>(MAB),
114 OW: MAB->createObjectWriter(OS&: OutFile), Emitter: std::unique_ptr<MCCodeEmitter>(MCE),
115 STI: *MSTI);
116 break;
117 }
118 }
119
120 if (!MS)
121 return createStringError(EC: std::errc::invalid_argument,
122 Fmt: "no object streamer for target %s",
123 Vals: TripleName.c_str());
124
125 // Finally create the AsmPrinter we'll use to emit the DIEs.
126 TM.reset(p: TheTarget->createTargetMachine(TT: TripleName, CPU: "", Features: "", Options: TargetOptions(),
127 RM: std::nullopt));
128 if (!TM)
129 return createStringError(EC: std::errc::invalid_argument,
130 Fmt: "no target machine for target %s",
131 Vals: TripleName.c_str());
132
133 Asm.reset(p: TheTarget->createAsmPrinter(TM&: *TM, Streamer: std::unique_ptr<MCStreamer>(MS)));
134 if (!Asm)
135 return createStringError(EC: std::errc::invalid_argument,
136 Fmt: "no asm printer for target %s",
137 Vals: TripleName.c_str());
138 Asm->setDwarfUsesRelocationsAcrossSections(false);
139
140 RangesSectionSize = 0;
141 RngListsSectionSize = 0;
142 LocSectionSize = 0;
143 LocListsSectionSize = 0;
144 LineSectionSize = 0;
145 FrameSectionSize = 0;
146 DebugInfoSectionSize = 0;
147 MacInfoSectionSize = 0;
148 MacroSectionSize = 0;
149
150 return Error::success();
151}
152
153void DwarfStreamer::finish() { MS->finish(); }
154
155void DwarfStreamer::switchToDebugInfoSection(unsigned DwarfVersion) {
156 MS->switchSection(Section: MOFI->getDwarfInfoSection());
157 MC->setDwarfVersion(DwarfVersion);
158}
159
160/// Emit the compilation unit header for \p Unit in the debug_info section.
161///
162/// A Dwarf 4 section header is encoded as:
163/// uint32_t Unit length (omitting this field)
164/// uint16_t Version
165/// uint32_t Abbreviation table offset
166/// uint8_t Address size
167/// Leading to a total of 11 bytes.
168///
169/// A Dwarf 5 section header is encoded as:
170/// uint32_t Unit length (omitting this field)
171/// uint16_t Version
172/// uint8_t Unit type
173/// uint8_t Address size
174/// uint32_t Abbreviation table offset
175/// Leading to a total of 12 bytes.
176void DwarfStreamer::emitCompileUnitHeader(CompileUnit &Unit,
177 unsigned DwarfVersion) {
178 switchToDebugInfoSection(DwarfVersion);
179
180 /// The start of the unit within its section.
181 Unit.setLabelBegin(Asm->createTempSymbol(Name: "cu_begin"));
182 Asm->OutStreamer->emitLabel(Symbol: Unit.getLabelBegin());
183
184 // Emit size of content not including length itself. The size has already
185 // been computed in CompileUnit::computeOffsets(). Subtract 4 to that size to
186 // account for the length field.
187 Asm->emitInt32(Value: Unit.getNextUnitOffset() - Unit.getStartOffset() - 4);
188 Asm->emitInt16(Value: DwarfVersion);
189
190 if (DwarfVersion >= 5) {
191 Asm->emitInt8(Value: dwarf::DW_UT_compile);
192 Asm->emitInt8(Value: Unit.getOrigUnit().getAddressByteSize());
193 // We share one abbreviations table across all units so it's always at the
194 // start of the section.
195 Asm->emitInt32(Value: 0);
196 DebugInfoSectionSize += 12;
197 } else {
198 // We share one abbreviations table across all units so it's always at the
199 // start of the section.
200 Asm->emitInt32(Value: 0);
201 Asm->emitInt8(Value: Unit.getOrigUnit().getAddressByteSize());
202 DebugInfoSectionSize += 11;
203 }
204
205 // Remember this CU.
206 EmittedUnits.push_back(x: {.ID: Unit.getUniqueID(), .LabelBegin: Unit.getLabelBegin()});
207}
208
209/// Emit the \p Abbrevs array as the shared abbreviation table
210/// for the linked Dwarf file.
211void DwarfStreamer::emitAbbrevs(
212 const std::vector<std::unique_ptr<DIEAbbrev>> &Abbrevs,
213 unsigned DwarfVersion) {
214 MS->switchSection(Section: MOFI->getDwarfAbbrevSection());
215 MC->setDwarfVersion(DwarfVersion);
216 Asm->emitDwarfAbbrevs(Abbrevs);
217}
218
219/// Recursively emit the DIE tree rooted at \p Die.
220void DwarfStreamer::emitDIE(DIE &Die) {
221 MS->switchSection(Section: MOFI->getDwarfInfoSection());
222 Asm->emitDwarfDIE(Die);
223 DebugInfoSectionSize += Die.getSize();
224}
225
226/// Emit contents of section SecName From Obj.
227void DwarfStreamer::emitSectionContents(StringRef SecData,
228 DebugSectionKind SecKind) {
229 if (SecData.empty())
230 return;
231
232 if (MCSection *Section = getMCSection(SecKind)) {
233 MS->switchSection(Section);
234
235 MS->emitBytes(Data: SecData);
236 }
237}
238
239MCSection *DwarfStreamer::getMCSection(DebugSectionKind SecKind) {
240 switch (SecKind) {
241 case DebugSectionKind::DebugInfo:
242 return MC->getObjectFileInfo()->getDwarfInfoSection();
243 case DebugSectionKind::DebugLine:
244 return MC->getObjectFileInfo()->getDwarfLineSection();
245 case DebugSectionKind::DebugFrame:
246 return MC->getObjectFileInfo()->getDwarfFrameSection();
247 case DebugSectionKind::DebugRange:
248 return MC->getObjectFileInfo()->getDwarfRangesSection();
249 case DebugSectionKind::DebugRngLists:
250 return MC->getObjectFileInfo()->getDwarfRnglistsSection();
251 case DebugSectionKind::DebugLoc:
252 return MC->getObjectFileInfo()->getDwarfLocSection();
253 case DebugSectionKind::DebugLocLists:
254 return MC->getObjectFileInfo()->getDwarfLoclistsSection();
255 case DebugSectionKind::DebugARanges:
256 return MC->getObjectFileInfo()->getDwarfARangesSection();
257 case DebugSectionKind::DebugAbbrev:
258 return MC->getObjectFileInfo()->getDwarfAbbrevSection();
259 case DebugSectionKind::DebugMacinfo:
260 return MC->getObjectFileInfo()->getDwarfMacinfoSection();
261 case DebugSectionKind::DebugMacro:
262 return MC->getObjectFileInfo()->getDwarfMacroSection();
263 case DebugSectionKind::DebugAddr:
264 return MC->getObjectFileInfo()->getDwarfAddrSection();
265 case DebugSectionKind::DebugStr:
266 return MC->getObjectFileInfo()->getDwarfStrSection();
267 case DebugSectionKind::DebugLineStr:
268 return MC->getObjectFileInfo()->getDwarfLineStrSection();
269 case DebugSectionKind::DebugStrOffsets:
270 return MC->getObjectFileInfo()->getDwarfStrOffSection();
271 case DebugSectionKind::DebugPubNames:
272 return MC->getObjectFileInfo()->getDwarfPubNamesSection();
273 case DebugSectionKind::DebugPubTypes:
274 return MC->getObjectFileInfo()->getDwarfPubTypesSection();
275 case DebugSectionKind::DebugNames:
276 return MC->getObjectFileInfo()->getDwarfDebugNamesSection();
277 case DebugSectionKind::AppleNames:
278 return MC->getObjectFileInfo()->getDwarfAccelNamesSection();
279 case DebugSectionKind::AppleNamespaces:
280 return MC->getObjectFileInfo()->getDwarfAccelNamespaceSection();
281 case DebugSectionKind::AppleObjC:
282 return MC->getObjectFileInfo()->getDwarfAccelObjCSection();
283 case DebugSectionKind::AppleTypes:
284 return MC->getObjectFileInfo()->getDwarfAccelTypesSection();
285 case DebugSectionKind::NumberOfEnumEntries:
286 llvm_unreachable("Unknown DebugSectionKind value");
287 break;
288 }
289
290 return nullptr;
291}
292
293/// Emit the debug_str section stored in \p Pool.
294void DwarfStreamer::emitStrings(const NonRelocatableStringpool &Pool) {
295 Asm->OutStreamer->switchSection(Section: MOFI->getDwarfStrSection());
296 std::vector<DwarfStringPoolEntryRef> Entries = Pool.getEntriesForEmission();
297 for (auto Entry : Entries) {
298 // Emit the string itself.
299 Asm->OutStreamer->emitBytes(Data: Entry.getString());
300 // Emit a null terminator.
301 Asm->emitInt8(Value: 0);
302 }
303}
304
305/// Emit the debug string offset table described by \p StringOffsets into the
306/// .debug_str_offsets table.
307void DwarfStreamer::emitStringOffsets(
308 const SmallVector<uint64_t> &StringOffsets, uint16_t TargetDWARFVersion) {
309
310 if (TargetDWARFVersion < 5 || StringOffsets.empty())
311 return;
312
313 Asm->OutStreamer->switchSection(Section: MOFI->getDwarfStrOffSection());
314
315 MCSymbol *BeginLabel = Asm->createTempSymbol(Name: "Bdebugstroff");
316 MCSymbol *EndLabel = Asm->createTempSymbol(Name: "Edebugstroff");
317
318 // Length.
319 Asm->emitLabelDifference(Hi: EndLabel, Lo: BeginLabel, Size: sizeof(uint32_t));
320 Asm->OutStreamer->emitLabel(Symbol: BeginLabel);
321 StrOffsetSectionSize += sizeof(uint32_t);
322
323 // Version.
324 MS->emitInt16(Value: 5);
325 StrOffsetSectionSize += sizeof(uint16_t);
326
327 // Padding.
328 MS->emitInt16(Value: 0);
329 StrOffsetSectionSize += sizeof(uint16_t);
330
331 for (auto Off : StringOffsets) {
332 Asm->OutStreamer->emitInt32(Value: Off);
333 StrOffsetSectionSize += sizeof(uint32_t);
334 }
335 Asm->OutStreamer->emitLabel(Symbol: EndLabel);
336}
337
338/// Emit the debug_line_str section stored in \p Pool.
339void DwarfStreamer::emitLineStrings(const NonRelocatableStringpool &Pool) {
340 Asm->OutStreamer->switchSection(Section: MOFI->getDwarfLineStrSection());
341 std::vector<DwarfStringPoolEntryRef> Entries = Pool.getEntriesForEmission();
342 for (auto Entry : Entries) {
343 // Emit the string itself.
344 Asm->OutStreamer->emitBytes(Data: Entry.getString());
345 // Emit a null terminator.
346 Asm->emitInt8(Value: 0);
347 }
348}
349
350void DwarfStreamer::emitDebugNames(DWARF5AccelTable &Table) {
351 if (EmittedUnits.empty())
352 return;
353
354 // Build up data structures needed to emit this section.
355 std::vector<std::variant<MCSymbol *, uint64_t>> CompUnits;
356 DenseMap<unsigned, unsigned> UniqueIdToCuMap;
357 unsigned Id = 0;
358 for (auto &CU : EmittedUnits) {
359 CompUnits.push_back(x: CU.LabelBegin);
360 // We might be omitting CUs, so we need to remap them.
361 UniqueIdToCuMap[CU.ID] = Id++;
362 }
363
364 Asm->OutStreamer->switchSection(Section: MOFI->getDwarfDebugNamesSection());
365 dwarf::Form Form = DIEInteger::BestForm(/*IsSigned*/ false,
366 Int: (uint64_t)UniqueIdToCuMap.size() - 1);
367 /// llvm-dwarfutil doesn't support type units + .debug_names right now.
368 // FIXME: add support for type units + .debug_names. For now the behavior is
369 // unsuported.
370 emitDWARF5AccelTable(
371 Asm: Asm.get(), Contents&: Table, CUs: CompUnits,
372 getIndexForEntry: [&](const DWARF5AccelTableData &Entry)
373 -> std::optional<DWARF5AccelTable::UnitIndexAndEncoding> {
374 if (UniqueIdToCuMap.size() > 1)
375 return {{.Index: UniqueIdToCuMap[Entry.getUnitID()],
376 .Encoding: {.Index: dwarf::DW_IDX_compile_unit, .Form: Form}}};
377 return std::nullopt;
378 });
379}
380
381void DwarfStreamer::emitAppleNamespaces(
382 AccelTable<AppleAccelTableStaticOffsetData> &Table) {
383 Asm->OutStreamer->switchSection(Section: MOFI->getDwarfAccelNamespaceSection());
384 auto *SectionBegin = Asm->createTempSymbol(Name: "namespac_begin");
385 Asm->OutStreamer->emitLabel(Symbol: SectionBegin);
386 emitAppleAccelTable(Asm: Asm.get(), Contents&: Table, Prefix: "namespac", SecBegin: SectionBegin);
387}
388
389void DwarfStreamer::emitAppleNames(
390 AccelTable<AppleAccelTableStaticOffsetData> &Table) {
391 Asm->OutStreamer->switchSection(Section: MOFI->getDwarfAccelNamesSection());
392 auto *SectionBegin = Asm->createTempSymbol(Name: "names_begin");
393 Asm->OutStreamer->emitLabel(Symbol: SectionBegin);
394 emitAppleAccelTable(Asm: Asm.get(), Contents&: Table, Prefix: "names", SecBegin: SectionBegin);
395}
396
397void DwarfStreamer::emitAppleObjc(
398 AccelTable<AppleAccelTableStaticOffsetData> &Table) {
399 Asm->OutStreamer->switchSection(Section: MOFI->getDwarfAccelObjCSection());
400 auto *SectionBegin = Asm->createTempSymbol(Name: "objc_begin");
401 Asm->OutStreamer->emitLabel(Symbol: SectionBegin);
402 emitAppleAccelTable(Asm: Asm.get(), Contents&: Table, Prefix: "objc", SecBegin: SectionBegin);
403}
404
405void DwarfStreamer::emitAppleTypes(
406 AccelTable<AppleAccelTableStaticTypeData> &Table) {
407 Asm->OutStreamer->switchSection(Section: MOFI->getDwarfAccelTypesSection());
408 auto *SectionBegin = Asm->createTempSymbol(Name: "types_begin");
409 Asm->OutStreamer->emitLabel(Symbol: SectionBegin);
410 emitAppleAccelTable(Asm: Asm.get(), Contents&: Table, Prefix: "types", SecBegin: SectionBegin);
411}
412
413/// Emit the swift_ast section stored in \p Buffers.
414void DwarfStreamer::emitSwiftAST(StringRef Buffer) {
415 MCSection *SwiftASTSection = MOFI->getDwarfSwiftASTSection();
416 SwiftASTSection->setAlignment(Align(32));
417 MS->switchSection(Section: SwiftASTSection);
418 MS->emitBytes(Data: Buffer);
419}
420
421void DwarfStreamer::emitSwiftReflectionSection(
422 llvm::binaryformat::Swift5ReflectionSectionKind ReflSectionKind,
423 StringRef Buffer, uint32_t Alignment, uint32_t Size) {
424 MCSection *ReflectionSection =
425 MOFI->getSwift5ReflectionSection(ReflSectionKind);
426 if (ReflectionSection == nullptr)
427 return;
428 ReflectionSection->setAlignment(Align(Alignment));
429 MS->switchSection(Section: ReflectionSection);
430 MS->emitBytes(Data: Buffer);
431}
432
433void DwarfStreamer::emitDwarfDebugArangesTable(
434 const CompileUnit &Unit, const AddressRanges &LinkedRanges) {
435 unsigned AddressSize = Unit.getOrigUnit().getAddressByteSize();
436
437 // Make .debug_aranges to be current section.
438 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfARangesSection());
439
440 // Emit Header.
441 MCSymbol *BeginLabel = Asm->createTempSymbol(Name: "Barange");
442 MCSymbol *EndLabel = Asm->createTempSymbol(Name: "Earange");
443
444 unsigned HeaderSize =
445 sizeof(int32_t) + // Size of contents (w/o this field
446 sizeof(int16_t) + // DWARF ARange version number
447 sizeof(int32_t) + // Offset of CU in the .debug_info section
448 sizeof(int8_t) + // Pointer Size (in bytes)
449 sizeof(int8_t); // Segment Size (in bytes)
450
451 unsigned TupleSize = AddressSize * 2;
452 unsigned Padding = offsetToAlignment(Value: HeaderSize, Alignment: Align(TupleSize));
453
454 Asm->emitLabelDifference(Hi: EndLabel, Lo: BeginLabel, Size: 4); // Arange length
455 Asm->OutStreamer->emitLabel(Symbol: BeginLabel);
456 Asm->emitInt16(Value: dwarf::DW_ARANGES_VERSION); // Version number
457 Asm->emitInt32(Value: Unit.getStartOffset()); // Corresponding unit's offset
458 Asm->emitInt8(Value: AddressSize); // Address size
459 Asm->emitInt8(Value: 0); // Segment size
460
461 Asm->OutStreamer->emitFill(NumBytes: Padding, FillValue: 0x0);
462
463 // Emit linked ranges.
464 for (const AddressRange &Range : LinkedRanges) {
465 MS->emitIntValue(Value: Range.start(), Size: AddressSize);
466 MS->emitIntValue(Value: Range.end() - Range.start(), Size: AddressSize);
467 }
468
469 // Emit terminator.
470 Asm->OutStreamer->emitIntValue(Value: 0, Size: AddressSize);
471 Asm->OutStreamer->emitIntValue(Value: 0, Size: AddressSize);
472 Asm->OutStreamer->emitLabel(Symbol: EndLabel);
473}
474
475void DwarfStreamer::emitDwarfDebugRangesTableFragment(
476 const CompileUnit &Unit, const AddressRanges &LinkedRanges,
477 PatchLocation Patch) {
478 Patch.set(RangesSectionSize);
479
480 // Make .debug_ranges to be current section.
481 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfRangesSection());
482 unsigned AddressSize = Unit.getOrigUnit().getAddressByteSize();
483
484 // Emit ranges.
485 uint64_t BaseAddress = 0;
486 if (std::optional<uint64_t> LowPC = Unit.getLowPc())
487 BaseAddress = *LowPC;
488
489 for (const AddressRange &Range : LinkedRanges) {
490 MS->emitIntValue(Value: Range.start() - BaseAddress, Size: AddressSize);
491 MS->emitIntValue(Value: Range.end() - BaseAddress, Size: AddressSize);
492
493 RangesSectionSize += AddressSize;
494 RangesSectionSize += AddressSize;
495 }
496
497 // Add the terminator entry.
498 MS->emitIntValue(Value: 0, Size: AddressSize);
499 MS->emitIntValue(Value: 0, Size: AddressSize);
500
501 RangesSectionSize += AddressSize;
502 RangesSectionSize += AddressSize;
503}
504
505MCSymbol *
506DwarfStreamer::emitDwarfDebugRangeListHeader(const CompileUnit &Unit) {
507 if (Unit.getOrigUnit().getVersion() < 5)
508 return nullptr;
509
510 // Make .debug_rnglists to be current section.
511 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfRnglistsSection());
512
513 MCSymbol *BeginLabel = Asm->createTempSymbol(Name: "Brnglists");
514 MCSymbol *EndLabel = Asm->createTempSymbol(Name: "Ernglists");
515 unsigned AddressSize = Unit.getOrigUnit().getAddressByteSize();
516
517 // Length
518 Asm->emitLabelDifference(Hi: EndLabel, Lo: BeginLabel, Size: sizeof(uint32_t));
519 Asm->OutStreamer->emitLabel(Symbol: BeginLabel);
520 RngListsSectionSize += sizeof(uint32_t);
521
522 // Version.
523 MS->emitInt16(Value: 5);
524 RngListsSectionSize += sizeof(uint16_t);
525
526 // Address size.
527 MS->emitInt8(Value: AddressSize);
528 RngListsSectionSize++;
529
530 // Seg_size
531 MS->emitInt8(Value: 0);
532 RngListsSectionSize++;
533
534 // Offset entry count
535 MS->emitInt32(Value: 0);
536 RngListsSectionSize += sizeof(uint32_t);
537
538 return EndLabel;
539}
540
541void DwarfStreamer::emitDwarfDebugRangeListFragment(
542 const CompileUnit &Unit, const AddressRanges &LinkedRanges,
543 PatchLocation Patch, DebugDieValuePool &AddrPool) {
544 if (Unit.getOrigUnit().getVersion() < 5) {
545 emitDwarfDebugRangesTableFragment(Unit, LinkedRanges, Patch);
546 return;
547 }
548
549 emitDwarfDebugRngListsTableFragment(Unit, LinkedRanges, Patch, AddrPool);
550}
551
552void DwarfStreamer::emitDwarfDebugRangeListFooter(const CompileUnit &Unit,
553 MCSymbol *EndLabel) {
554 if (Unit.getOrigUnit().getVersion() < 5)
555 return;
556
557 // Make .debug_rnglists to be current section.
558 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfRnglistsSection());
559
560 if (EndLabel != nullptr)
561 Asm->OutStreamer->emitLabel(Symbol: EndLabel);
562}
563
564void DwarfStreamer::emitDwarfDebugRngListsTableFragment(
565 const CompileUnit &Unit, const AddressRanges &LinkedRanges,
566 PatchLocation Patch, DebugDieValuePool &AddrPool) {
567 Patch.set(RngListsSectionSize);
568
569 // Make .debug_rnglists to be current section.
570 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfRnglistsSection());
571 std::optional<uint64_t> BaseAddress;
572
573 for (const AddressRange &Range : LinkedRanges) {
574
575 if (!BaseAddress) {
576 BaseAddress = Range.start();
577
578 // Emit base address.
579 MS->emitInt8(Value: dwarf::DW_RLE_base_addressx);
580 RngListsSectionSize += 1;
581 RngListsSectionSize +=
582 MS->emitULEB128IntValue(Value: AddrPool.getValueIndex(Value: *BaseAddress));
583 }
584
585 // Emit type of entry.
586 MS->emitInt8(Value: dwarf::DW_RLE_offset_pair);
587 RngListsSectionSize += 1;
588
589 // Emit start offset relative to base address.
590 RngListsSectionSize +=
591 MS->emitULEB128IntValue(Value: Range.start() - *BaseAddress);
592
593 // Emit end offset relative to base address.
594 RngListsSectionSize += MS->emitULEB128IntValue(Value: Range.end() - *BaseAddress);
595 }
596
597 // Emit the terminator entry.
598 MS->emitInt8(Value: dwarf::DW_RLE_end_of_list);
599 RngListsSectionSize += 1;
600}
601
602/// Emit debug locations(.debug_loc, .debug_loclists) header.
603MCSymbol *DwarfStreamer::emitDwarfDebugLocListHeader(const CompileUnit &Unit) {
604 if (Unit.getOrigUnit().getVersion() < 5)
605 return nullptr;
606
607 // Make .debug_loclists the current section.
608 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfLoclistsSection());
609
610 MCSymbol *BeginLabel = Asm->createTempSymbol(Name: "Bloclists");
611 MCSymbol *EndLabel = Asm->createTempSymbol(Name: "Eloclists");
612 unsigned AddressSize = Unit.getOrigUnit().getAddressByteSize();
613
614 // Length
615 Asm->emitLabelDifference(Hi: EndLabel, Lo: BeginLabel, Size: sizeof(uint32_t));
616 Asm->OutStreamer->emitLabel(Symbol: BeginLabel);
617 LocListsSectionSize += sizeof(uint32_t);
618
619 // Version.
620 MS->emitInt16(Value: 5);
621 LocListsSectionSize += sizeof(uint16_t);
622
623 // Address size.
624 MS->emitInt8(Value: AddressSize);
625 LocListsSectionSize++;
626
627 // Seg_size
628 MS->emitInt8(Value: 0);
629 LocListsSectionSize++;
630
631 // Offset entry count
632 MS->emitInt32(Value: 0);
633 LocListsSectionSize += sizeof(uint32_t);
634
635 return EndLabel;
636}
637
638/// Emit debug locations(.debug_loc, .debug_loclists) fragment.
639void DwarfStreamer::emitDwarfDebugLocListFragment(
640 const CompileUnit &Unit,
641 const DWARFLocationExpressionsVector &LinkedLocationExpression,
642 PatchLocation Patch, DebugDieValuePool &AddrPool) {
643 if (Unit.getOrigUnit().getVersion() < 5) {
644 emitDwarfDebugLocTableFragment(Unit, LinkedLocationExpression, Patch);
645 return;
646 }
647
648 emitDwarfDebugLocListsTableFragment(Unit, LinkedLocationExpression, Patch,
649 AddrPool);
650}
651
652/// Emit debug locations(.debug_loc, .debug_loclists) footer.
653void DwarfStreamer::emitDwarfDebugLocListFooter(const CompileUnit &Unit,
654 MCSymbol *EndLabel) {
655 if (Unit.getOrigUnit().getVersion() < 5)
656 return;
657
658 // Make .debug_loclists the current section.
659 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfLoclistsSection());
660
661 if (EndLabel != nullptr)
662 Asm->OutStreamer->emitLabel(Symbol: EndLabel);
663}
664
665/// Emit piece of .debug_loc for \p LinkedLocationExpression.
666void DwarfStreamer::emitDwarfDebugLocTableFragment(
667 const CompileUnit &Unit,
668 const DWARFLocationExpressionsVector &LinkedLocationExpression,
669 PatchLocation Patch) {
670 Patch.set(LocSectionSize);
671
672 // Make .debug_loc to be current section.
673 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfLocSection());
674 unsigned AddressSize = Unit.getOrigUnit().getAddressByteSize();
675
676 // Emit ranges.
677 uint64_t BaseAddress = 0;
678 if (std::optional<uint64_t> LowPC = Unit.getLowPc())
679 BaseAddress = *LowPC;
680
681 for (const DWARFLocationExpression &LocExpression :
682 LinkedLocationExpression) {
683 if (LocExpression.Range) {
684 MS->emitIntValue(Value: LocExpression.Range->LowPC - BaseAddress, Size: AddressSize);
685 MS->emitIntValue(Value: LocExpression.Range->HighPC - BaseAddress, Size: AddressSize);
686
687 LocSectionSize += AddressSize;
688 LocSectionSize += AddressSize;
689 }
690
691 Asm->OutStreamer->emitIntValue(Value: LocExpression.Expr.size(), Size: 2);
692 Asm->OutStreamer->emitBytes(Data: StringRef(
693 (const char *)LocExpression.Expr.data(), LocExpression.Expr.size()));
694 LocSectionSize += LocExpression.Expr.size() + 2;
695 }
696
697 // Add the terminator entry.
698 MS->emitIntValue(Value: 0, Size: AddressSize);
699 MS->emitIntValue(Value: 0, Size: AddressSize);
700
701 LocSectionSize += AddressSize;
702 LocSectionSize += AddressSize;
703}
704
705/// Emit .debug_addr header.
706MCSymbol *DwarfStreamer::emitDwarfDebugAddrsHeader(const CompileUnit &Unit) {
707
708 // Make .debug_addr the current section.
709 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfAddrSection());
710
711 MCSymbol *BeginLabel = Asm->createTempSymbol(Name: "Bdebugaddr");
712 MCSymbol *EndLabel = Asm->createTempSymbol(Name: "Edebugaddr");
713 unsigned AddrSize = Unit.getOrigUnit().getAddressByteSize();
714
715 // Emit length.
716 Asm->emitLabelDifference(Hi: EndLabel, Lo: BeginLabel, Size: sizeof(uint32_t));
717 Asm->OutStreamer->emitLabel(Symbol: BeginLabel);
718 AddrSectionSize += sizeof(uint32_t);
719
720 // Emit version.
721 Asm->emitInt16(Value: 5);
722 AddrSectionSize += 2;
723
724 // Emit address size.
725 Asm->emitInt8(Value: AddrSize);
726 AddrSectionSize += 1;
727
728 // Emit segment size.
729 Asm->emitInt8(Value: 0);
730 AddrSectionSize += 1;
731
732 return EndLabel;
733}
734
735/// Emit the .debug_addr addresses stored in \p Addrs.
736void DwarfStreamer::emitDwarfDebugAddrs(const SmallVector<uint64_t> &Addrs,
737 uint8_t AddrSize) {
738 Asm->OutStreamer->switchSection(Section: MOFI->getDwarfAddrSection());
739 for (auto Addr : Addrs) {
740 Asm->OutStreamer->emitIntValue(Value: Addr, Size: AddrSize);
741 AddrSectionSize += AddrSize;
742 }
743}
744
745/// Emit .debug_addr footer.
746void DwarfStreamer::emitDwarfDebugAddrsFooter(const CompileUnit &Unit,
747 MCSymbol *EndLabel) {
748
749 // Make .debug_addr the current section.
750 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfAddrSection());
751
752 if (EndLabel != nullptr)
753 Asm->OutStreamer->emitLabel(Symbol: EndLabel);
754}
755
756/// Emit piece of .debug_loclists for \p LinkedLocationExpression.
757void DwarfStreamer::emitDwarfDebugLocListsTableFragment(
758 const CompileUnit &Unit,
759 const DWARFLocationExpressionsVector &LinkedLocationExpression,
760 PatchLocation Patch, DebugDieValuePool &AddrPool) {
761 Patch.set(LocListsSectionSize);
762
763 // Make .debug_loclists the current section.
764 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfLoclistsSection());
765 std::optional<uint64_t> BaseAddress;
766
767 for (const DWARFLocationExpression &LocExpression :
768 LinkedLocationExpression) {
769 if (LocExpression.Range) {
770
771 if (!BaseAddress) {
772
773 BaseAddress = LocExpression.Range->LowPC;
774
775 // Emit base address.
776 MS->emitInt8(Value: dwarf::DW_LLE_base_addressx);
777 LocListsSectionSize += 1;
778 LocListsSectionSize +=
779 MS->emitULEB128IntValue(Value: AddrPool.getValueIndex(Value: *BaseAddress));
780 }
781
782 // Emit type of entry.
783 MS->emitInt8(Value: dwarf::DW_LLE_offset_pair);
784 LocListsSectionSize += 1;
785
786 // Emit start offset relative to base address.
787 LocListsSectionSize +=
788 MS->emitULEB128IntValue(Value: LocExpression.Range->LowPC - *BaseAddress);
789
790 // Emit end offset relative to base address.
791 LocListsSectionSize +=
792 MS->emitULEB128IntValue(Value: LocExpression.Range->HighPC - *BaseAddress);
793 } else {
794 // Emit type of entry.
795 MS->emitInt8(Value: dwarf::DW_LLE_default_location);
796 LocListsSectionSize += 1;
797 }
798
799 LocListsSectionSize += MS->emitULEB128IntValue(Value: LocExpression.Expr.size());
800 Asm->OutStreamer->emitBytes(Data: StringRef(
801 (const char *)LocExpression.Expr.data(), LocExpression.Expr.size()));
802 LocListsSectionSize += LocExpression.Expr.size();
803 }
804
805 // Emit the terminator entry.
806 MS->emitInt8(Value: dwarf::DW_LLE_end_of_list);
807 LocListsSectionSize += 1;
808}
809
810void DwarfStreamer::emitLineTableForUnit(
811 const DWARFDebugLine::LineTable &LineTable, const CompileUnit &Unit,
812 OffsetsStringPool &DebugStrPool, OffsetsStringPool &DebugLineStrPool) {
813 // Switch to the section where the table will be emitted into.
814 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfLineSection());
815
816 MCSymbol *LineStartSym = MC->createTempSymbol();
817 MCSymbol *LineEndSym = MC->createTempSymbol();
818
819 // unit_length.
820 if (LineTable.Prologue.FormParams.Format == dwarf::DwarfFormat::DWARF64) {
821 MS->emitInt32(Value: dwarf::DW_LENGTH_DWARF64);
822 LineSectionSize += 4;
823 }
824 emitLabelDifference(Hi: LineEndSym, Lo: LineStartSym,
825 Format: LineTable.Prologue.FormParams.Format, SectionSize&: LineSectionSize);
826 Asm->OutStreamer->emitLabel(Symbol: LineStartSym);
827
828 // Emit prologue.
829 emitLineTablePrologue(P: LineTable.Prologue, DebugStrPool, DebugLineStrPool);
830
831 // Emit rows.
832 emitLineTableRows(LineTable, LineEndSym,
833 AddressByteSize: Unit.getOrigUnit().getAddressByteSize());
834}
835
836void DwarfStreamer::emitLineTablePrologue(const DWARFDebugLine::Prologue &P,
837 OffsetsStringPool &DebugStrPool,
838 OffsetsStringPool &DebugLineStrPool) {
839 MCSymbol *PrologueStartSym = MC->createTempSymbol();
840 MCSymbol *PrologueEndSym = MC->createTempSymbol();
841
842 // version (uhalf).
843 MS->emitInt16(Value: P.getVersion());
844 LineSectionSize += 2;
845 if (P.getVersion() == 5) {
846 // address_size (ubyte).
847 MS->emitInt8(Value: P.getAddressSize());
848 LineSectionSize += 1;
849
850 // segment_selector_size (ubyte).
851 MS->emitInt8(Value: P.SegSelectorSize);
852 LineSectionSize += 1;
853 }
854
855 // header_length.
856 emitLabelDifference(Hi: PrologueEndSym, Lo: PrologueStartSym, Format: P.FormParams.Format,
857 SectionSize&: LineSectionSize);
858
859 Asm->OutStreamer->emitLabel(Symbol: PrologueStartSym);
860 emitLineTableProloguePayload(P, DebugStrPool, DebugLineStrPool);
861 Asm->OutStreamer->emitLabel(Symbol: PrologueEndSym);
862}
863
864void DwarfStreamer::emitLineTablePrologueV2IncludeAndFileTable(
865 const DWARFDebugLine::Prologue &P, OffsetsStringPool &DebugStrPool,
866 OffsetsStringPool &DebugLineStrPool) {
867 // include_directories (sequence of path names).
868 for (const DWARFFormValue &Include : P.IncludeDirectories)
869 emitLineTableString(P, String: Include, DebugStrPool, DebugLineStrPool);
870 // The last entry is followed by a single null byte.
871 MS->emitInt8(Value: 0);
872 LineSectionSize += 1;
873
874 // file_names (sequence of file entries).
875 for (const DWARFDebugLine::FileNameEntry &File : P.FileNames) {
876 // A null-terminated string containing the full or relative path name of a
877 // source file.
878 emitLineTableString(P, String: File.Name, DebugStrPool, DebugLineStrPool);
879 // An unsigned LEB128 number representing the directory index of a directory
880 // in the include_directories section.
881 LineSectionSize += MS->emitULEB128IntValue(Value: File.DirIdx);
882 // An unsigned LEB128 number representing the (implementation-defined) time
883 // of last modification for the file, or 0 if not available.
884 LineSectionSize += MS->emitULEB128IntValue(Value: File.ModTime);
885 // An unsigned LEB128 number representing the length in bytes of the file,
886 // or 0 if not available.
887 LineSectionSize += MS->emitULEB128IntValue(Value: File.Length);
888 }
889 // The last entry is followed by a single null byte.
890 MS->emitInt8(Value: 0);
891 LineSectionSize += 1;
892}
893
894void DwarfStreamer::emitLineTablePrologueV5IncludeAndFileTable(
895 const DWARFDebugLine::Prologue &P, OffsetsStringPool &DebugStrPool,
896 OffsetsStringPool &DebugLineStrPool) {
897 if (P.IncludeDirectories.empty()) {
898 // directory_entry_format_count(ubyte).
899 MS->emitInt8(Value: 0);
900 LineSectionSize += 1;
901 } else {
902 // directory_entry_format_count(ubyte).
903 MS->emitInt8(Value: 1);
904 LineSectionSize += 1;
905
906 // directory_entry_format (sequence of ULEB128 pairs).
907 LineSectionSize += MS->emitULEB128IntValue(Value: dwarf::DW_LNCT_path);
908 LineSectionSize +=
909 MS->emitULEB128IntValue(Value: P.IncludeDirectories[0].getForm());
910 }
911
912 // directories_count (ULEB128).
913 LineSectionSize += MS->emitULEB128IntValue(Value: P.IncludeDirectories.size());
914 // directories (sequence of directory names).
915 for (auto Include : P.IncludeDirectories)
916 emitLineTableString(P, String: Include, DebugStrPool, DebugLineStrPool);
917
918 bool HasChecksums = P.ContentTypes.HasMD5;
919 bool HasInlineSources = P.ContentTypes.HasSource;
920
921 if (P.FileNames.empty()) {
922 // file_name_entry_format_count (ubyte).
923 MS->emitInt8(Value: 0);
924 LineSectionSize += 1;
925 } else {
926 // file_name_entry_format_count (ubyte).
927 MS->emitInt8(Value: 2 + (HasChecksums ? 1 : 0) + (HasInlineSources ? 1 : 0));
928 LineSectionSize += 1;
929
930 // file_name_entry_format (sequence of ULEB128 pairs).
931 auto StrForm = P.FileNames[0].Name.getForm();
932 LineSectionSize += MS->emitULEB128IntValue(Value: dwarf::DW_LNCT_path);
933 LineSectionSize += MS->emitULEB128IntValue(Value: StrForm);
934
935 LineSectionSize += MS->emitULEB128IntValue(Value: dwarf::DW_LNCT_directory_index);
936 LineSectionSize += MS->emitULEB128IntValue(Value: dwarf::DW_FORM_data1);
937
938 if (HasChecksums) {
939 LineSectionSize += MS->emitULEB128IntValue(Value: dwarf::DW_LNCT_MD5);
940 LineSectionSize += MS->emitULEB128IntValue(Value: dwarf::DW_FORM_data16);
941 }
942
943 if (HasInlineSources) {
944 LineSectionSize += MS->emitULEB128IntValue(Value: dwarf::DW_LNCT_LLVM_source);
945 LineSectionSize += MS->emitULEB128IntValue(Value: StrForm);
946 }
947 }
948
949 // file_names_count (ULEB128).
950 LineSectionSize += MS->emitULEB128IntValue(Value: P.FileNames.size());
951
952 // file_names (sequence of file name entries).
953 for (auto File : P.FileNames) {
954 emitLineTableString(P, String: File.Name, DebugStrPool, DebugLineStrPool);
955 MS->emitInt8(Value: File.DirIdx);
956 LineSectionSize += 1;
957 if (HasChecksums) {
958 MS->emitBinaryData(
959 Data: StringRef(reinterpret_cast<const char *>(File.Checksum.data()),
960 File.Checksum.size()));
961 LineSectionSize += File.Checksum.size();
962 }
963 if (HasInlineSources)
964 emitLineTableString(P, String: File.Source, DebugStrPool, DebugLineStrPool);
965 }
966}
967
968void DwarfStreamer::emitLineTableString(const DWARFDebugLine::Prologue &P,
969 const DWARFFormValue &String,
970 OffsetsStringPool &DebugStrPool,
971 OffsetsStringPool &DebugLineStrPool) {
972 std::optional<const char *> StringVal = dwarf::toString(V: String);
973 if (!StringVal) {
974 warn(Warning: "Cann't read string from line table.");
975 return;
976 }
977
978 switch (String.getForm()) {
979 case dwarf::DW_FORM_string: {
980 StringRef Str = *StringVal;
981 Asm->OutStreamer->emitBytes(Data: Str.data());
982 Asm->emitInt8(Value: 0);
983 LineSectionSize += Str.size() + 1;
984 } break;
985 case dwarf::DW_FORM_strp:
986 case dwarf::DW_FORM_line_strp: {
987 DwarfStringPoolEntryRef StringRef =
988 String.getForm() == dwarf::DW_FORM_strp
989 ? DebugStrPool.getEntry(S: *StringVal)
990 : DebugLineStrPool.getEntry(S: *StringVal);
991
992 emitIntOffset(Offset: StringRef.getOffset(), Format: P.FormParams.Format, SectionSize&: LineSectionSize);
993 } break;
994 default:
995 warn(Warning: "Unsupported string form inside line table.");
996 break;
997 };
998}
999
1000void DwarfStreamer::emitLineTableProloguePayload(
1001 const DWARFDebugLine::Prologue &P, OffsetsStringPool &DebugStrPool,
1002 OffsetsStringPool &DebugLineStrPool) {
1003 // minimum_instruction_length (ubyte).
1004 MS->emitInt8(Value: P.MinInstLength);
1005 LineSectionSize += 1;
1006 if (P.FormParams.Version >= 4) {
1007 // maximum_operations_per_instruction (ubyte).
1008 MS->emitInt8(Value: P.MaxOpsPerInst);
1009 LineSectionSize += 1;
1010 }
1011 // default_is_stmt (ubyte).
1012 MS->emitInt8(Value: P.DefaultIsStmt);
1013 LineSectionSize += 1;
1014 // line_base (sbyte).
1015 MS->emitInt8(Value: P.LineBase);
1016 LineSectionSize += 1;
1017 // line_range (ubyte).
1018 MS->emitInt8(Value: P.LineRange);
1019 LineSectionSize += 1;
1020 // opcode_base (ubyte).
1021 MS->emitInt8(Value: P.OpcodeBase);
1022 LineSectionSize += 1;
1023
1024 // standard_opcode_lengths (array of ubyte).
1025 for (auto Length : P.StandardOpcodeLengths) {
1026 MS->emitInt8(Value: Length);
1027 LineSectionSize += 1;
1028 }
1029
1030 if (P.FormParams.Version < 5)
1031 emitLineTablePrologueV2IncludeAndFileTable(P, DebugStrPool,
1032 DebugLineStrPool);
1033 else
1034 emitLineTablePrologueV5IncludeAndFileTable(P, DebugStrPool,
1035 DebugLineStrPool);
1036}
1037
1038void DwarfStreamer::emitLineTableRows(
1039 const DWARFDebugLine::LineTable &LineTable, MCSymbol *LineEndSym,
1040 unsigned AddressByteSize) {
1041
1042 MCDwarfLineTableParams Params;
1043 Params.DWARF2LineOpcodeBase = LineTable.Prologue.OpcodeBase;
1044 Params.DWARF2LineBase = LineTable.Prologue.LineBase;
1045 Params.DWARF2LineRange = LineTable.Prologue.LineRange;
1046
1047 SmallString<128> EncodingBuffer;
1048
1049 if (LineTable.Rows.empty()) {
1050 // We only have the dummy entry, dsymutil emits an entry with a 0
1051 // address in that case.
1052 MCDwarfLineAddr::encode(Context&: *MC, Params, LineDelta: std::numeric_limits<int64_t>::max(), AddrDelta: 0,
1053 OS&: EncodingBuffer);
1054 MS->emitBytes(Data: EncodingBuffer);
1055 LineSectionSize += EncodingBuffer.size();
1056 MS->emitLabel(Symbol: LineEndSym);
1057 return;
1058 }
1059
1060 // Line table state machine fields
1061 unsigned FileNum = 1;
1062 unsigned LastLine = 1;
1063 unsigned Column = 0;
1064 unsigned Discriminator = 0;
1065 unsigned IsStatement = 1;
1066 unsigned Isa = 0;
1067 uint64_t Address = -1ULL;
1068
1069 unsigned RowsSinceLastSequence = 0;
1070
1071 for (const DWARFDebugLine::Row &Row : LineTable.Rows) {
1072 int64_t AddressDelta;
1073 if (Address == -1ULL) {
1074 MS->emitIntValue(Value: dwarf::DW_LNS_extended_op, Size: 1);
1075 MS->emitULEB128IntValue(Value: AddressByteSize + 1);
1076 MS->emitIntValue(Value: dwarf::DW_LNE_set_address, Size: 1);
1077 MS->emitIntValue(Value: Row.Address.Address, Size: AddressByteSize);
1078 LineSectionSize +=
1079 2 + AddressByteSize + getULEB128Size(Value: AddressByteSize + 1);
1080 AddressDelta = 0;
1081 } else {
1082 AddressDelta =
1083 (Row.Address.Address - Address) / LineTable.Prologue.MinInstLength;
1084 }
1085
1086 // FIXME: code copied and transformed from MCDwarf.cpp::EmitDwarfLineTable.
1087 // We should find a way to share this code, but the current compatibility
1088 // requirement with classic dsymutil makes it hard. Revisit that once this
1089 // requirement is dropped.
1090
1091 if (FileNum != Row.File) {
1092 FileNum = Row.File;
1093 MS->emitIntValue(Value: dwarf::DW_LNS_set_file, Size: 1);
1094 MS->emitULEB128IntValue(Value: FileNum);
1095 LineSectionSize += 1 + getULEB128Size(Value: FileNum);
1096 }
1097 if (Column != Row.Column) {
1098 Column = Row.Column;
1099 MS->emitIntValue(Value: dwarf::DW_LNS_set_column, Size: 1);
1100 MS->emitULEB128IntValue(Value: Column);
1101 LineSectionSize += 1 + getULEB128Size(Value: Column);
1102 }
1103 if (Discriminator != Row.Discriminator &&
1104 MS->getContext().getDwarfVersion() >= 4) {
1105 Discriminator = Row.Discriminator;
1106 unsigned Size = getULEB128Size(Value: Discriminator);
1107 MS->emitIntValue(Value: dwarf::DW_LNS_extended_op, Size: 1);
1108 MS->emitULEB128IntValue(Value: Size + 1);
1109 MS->emitIntValue(Value: dwarf::DW_LNE_set_discriminator, Size: 1);
1110 MS->emitULEB128IntValue(Value: Discriminator);
1111 LineSectionSize += /* extended op */ 1 + getULEB128Size(Value: Size + 1) +
1112 /* discriminator */ 1 + Size;
1113 }
1114 Discriminator = 0;
1115
1116 if (Isa != Row.Isa) {
1117 Isa = Row.Isa;
1118 MS->emitIntValue(Value: dwarf::DW_LNS_set_isa, Size: 1);
1119 MS->emitULEB128IntValue(Value: Isa);
1120 LineSectionSize += 1 + getULEB128Size(Value: Isa);
1121 }
1122 if (IsStatement != Row.IsStmt) {
1123 IsStatement = Row.IsStmt;
1124 MS->emitIntValue(Value: dwarf::DW_LNS_negate_stmt, Size: 1);
1125 LineSectionSize += 1;
1126 }
1127 if (Row.BasicBlock) {
1128 MS->emitIntValue(Value: dwarf::DW_LNS_set_basic_block, Size: 1);
1129 LineSectionSize += 1;
1130 }
1131
1132 if (Row.PrologueEnd) {
1133 MS->emitIntValue(Value: dwarf::DW_LNS_set_prologue_end, Size: 1);
1134 LineSectionSize += 1;
1135 }
1136
1137 if (Row.EpilogueBegin) {
1138 MS->emitIntValue(Value: dwarf::DW_LNS_set_epilogue_begin, Size: 1);
1139 LineSectionSize += 1;
1140 }
1141
1142 int64_t LineDelta = int64_t(Row.Line) - LastLine;
1143 if (!Row.EndSequence) {
1144 MCDwarfLineAddr::encode(Context&: *MC, Params, LineDelta, AddrDelta: AddressDelta,
1145 OS&: EncodingBuffer);
1146 MS->emitBytes(Data: EncodingBuffer);
1147 LineSectionSize += EncodingBuffer.size();
1148 EncodingBuffer.resize(N: 0);
1149 Address = Row.Address.Address;
1150 LastLine = Row.Line;
1151 RowsSinceLastSequence++;
1152 } else {
1153 if (LineDelta) {
1154 MS->emitIntValue(Value: dwarf::DW_LNS_advance_line, Size: 1);
1155 MS->emitSLEB128IntValue(Value: LineDelta);
1156 LineSectionSize += 1 + getSLEB128Size(Value: LineDelta);
1157 }
1158 if (AddressDelta) {
1159 MS->emitIntValue(Value: dwarf::DW_LNS_advance_pc, Size: 1);
1160 MS->emitULEB128IntValue(Value: AddressDelta);
1161 LineSectionSize += 1 + getULEB128Size(Value: AddressDelta);
1162 }
1163 MCDwarfLineAddr::encode(Context&: *MC, Params, LineDelta: std::numeric_limits<int64_t>::max(),
1164 AddrDelta: 0, OS&: EncodingBuffer);
1165 MS->emitBytes(Data: EncodingBuffer);
1166 LineSectionSize += EncodingBuffer.size();
1167 EncodingBuffer.resize(N: 0);
1168 Address = -1ULL;
1169 LastLine = FileNum = IsStatement = 1;
1170 RowsSinceLastSequence = Column = Discriminator = Isa = 0;
1171 }
1172 }
1173
1174 if (RowsSinceLastSequence) {
1175 MCDwarfLineAddr::encode(Context&: *MC, Params, LineDelta: std::numeric_limits<int64_t>::max(), AddrDelta: 0,
1176 OS&: EncodingBuffer);
1177 MS->emitBytes(Data: EncodingBuffer);
1178 LineSectionSize += EncodingBuffer.size();
1179 EncodingBuffer.resize(N: 0);
1180 }
1181
1182 MS->emitLabel(Symbol: LineEndSym);
1183}
1184
1185void DwarfStreamer::emitIntOffset(uint64_t Offset, dwarf::DwarfFormat Format,
1186 uint64_t &SectionSize) {
1187 uint8_t Size = dwarf::getDwarfOffsetByteSize(Format);
1188 MS->emitIntValue(Value: Offset, Size);
1189 SectionSize += Size;
1190}
1191
1192void DwarfStreamer::emitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
1193 dwarf::DwarfFormat Format,
1194 uint64_t &SectionSize) {
1195 uint8_t Size = dwarf::getDwarfOffsetByteSize(Format);
1196 Asm->emitLabelDifference(Hi, Lo, Size);
1197 SectionSize += Size;
1198}
1199
1200/// Emit the pubnames or pubtypes section contribution for \p
1201/// Unit into \p Sec. The data is provided in \p Names.
1202void DwarfStreamer::emitPubSectionForUnit(
1203 MCSection *Sec, StringRef SecName, const CompileUnit &Unit,
1204 const std::vector<CompileUnit::AccelInfo> &Names) {
1205 if (Names.empty())
1206 return;
1207
1208 // Start the dwarf pubnames section.
1209 Asm->OutStreamer->switchSection(Section: Sec);
1210 MCSymbol *BeginLabel = Asm->createTempSymbol(Name: "pub" + SecName + "_begin");
1211 MCSymbol *EndLabel = Asm->createTempSymbol(Name: "pub" + SecName + "_end");
1212
1213 bool HeaderEmitted = false;
1214 // Emit the pubnames for this compilation unit.
1215 for (const auto &Name : Names) {
1216 if (Name.SkipPubSection)
1217 continue;
1218
1219 if (!HeaderEmitted) {
1220 // Emit the header.
1221 Asm->emitLabelDifference(Hi: EndLabel, Lo: BeginLabel, Size: 4); // Length
1222 Asm->OutStreamer->emitLabel(Symbol: BeginLabel);
1223 Asm->emitInt16(Value: dwarf::DW_PUBNAMES_VERSION); // Version
1224 Asm->emitInt32(Value: Unit.getStartOffset()); // Unit offset
1225 Asm->emitInt32(Value: Unit.getNextUnitOffset() - Unit.getStartOffset()); // Size
1226 HeaderEmitted = true;
1227 }
1228 Asm->emitInt32(Value: Name.Die->getOffset());
1229
1230 // Emit the string itself.
1231 Asm->OutStreamer->emitBytes(Data: Name.Name.getString());
1232 // Emit a null terminator.
1233 Asm->emitInt8(Value: 0);
1234 }
1235
1236 if (!HeaderEmitted)
1237 return;
1238 Asm->emitInt32(Value: 0); // End marker.
1239 Asm->OutStreamer->emitLabel(Symbol: EndLabel);
1240}
1241
1242/// Emit .debug_pubnames for \p Unit.
1243void DwarfStreamer::emitPubNamesForUnit(const CompileUnit &Unit) {
1244 emitPubSectionForUnit(Sec: MC->getObjectFileInfo()->getDwarfPubNamesSection(),
1245 SecName: "names", Unit, Names: Unit.getPubnames());
1246}
1247
1248/// Emit .debug_pubtypes for \p Unit.
1249void DwarfStreamer::emitPubTypesForUnit(const CompileUnit &Unit) {
1250 emitPubSectionForUnit(Sec: MC->getObjectFileInfo()->getDwarfPubTypesSection(),
1251 SecName: "types", Unit, Names: Unit.getPubtypes());
1252}
1253
1254/// Emit a CIE into the debug_frame section.
1255void DwarfStreamer::emitCIE(StringRef CIEBytes) {
1256 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfFrameSection());
1257
1258 MS->emitBytes(Data: CIEBytes);
1259 FrameSectionSize += CIEBytes.size();
1260}
1261
1262/// Emit a FDE into the debug_frame section. \p FDEBytes
1263/// contains the FDE data without the length, CIE offset and address
1264/// which will be replaced with the parameter values.
1265void DwarfStreamer::emitFDE(uint32_t CIEOffset, uint32_t AddrSize,
1266 uint64_t Address, StringRef FDEBytes) {
1267 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfFrameSection());
1268
1269 MS->emitIntValue(Value: FDEBytes.size() + 4 + AddrSize, Size: 4);
1270 MS->emitIntValue(Value: CIEOffset, Size: 4);
1271 MS->emitIntValue(Value: Address, Size: AddrSize);
1272 MS->emitBytes(Data: FDEBytes);
1273 FrameSectionSize += FDEBytes.size() + 8 + AddrSize;
1274}
1275
1276void DwarfStreamer::emitMacroTables(DWARFContext *Context,
1277 const Offset2UnitMap &UnitMacroMap,
1278 OffsetsStringPool &StringPool) {
1279 assert(Context != nullptr && "Empty DWARF context");
1280
1281 // Check for .debug_macinfo table.
1282 if (const DWARFDebugMacro *Table = Context->getDebugMacinfo()) {
1283 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfMacinfoSection());
1284 emitMacroTableImpl(MacroTable: Table, UnitMacroMap, StringPool, OutOffset&: MacInfoSectionSize);
1285 }
1286
1287 // Check for .debug_macro table.
1288 if (const DWARFDebugMacro *Table = Context->getDebugMacro()) {
1289 MS->switchSection(Section: MC->getObjectFileInfo()->getDwarfMacroSection());
1290 emitMacroTableImpl(MacroTable: Table, UnitMacroMap, StringPool, OutOffset&: MacroSectionSize);
1291 }
1292}
1293
1294void DwarfStreamer::emitMacroTableImpl(const DWARFDebugMacro *MacroTable,
1295 const Offset2UnitMap &UnitMacroMap,
1296 OffsetsStringPool &StringPool,
1297 uint64_t &OutOffset) {
1298 bool DefAttributeIsReported = false;
1299 bool UndefAttributeIsReported = false;
1300 bool ImportAttributeIsReported = false;
1301 for (const DWARFDebugMacro::MacroList &List : MacroTable->MacroLists) {
1302 Offset2UnitMap::const_iterator UnitIt = UnitMacroMap.find(Val: List.Offset);
1303 if (UnitIt == UnitMacroMap.end()) {
1304 warn(Warning: formatv(
1305 Fmt: "couldn`t find compile unit for the macro table with offset = {0:x}",
1306 Vals: List.Offset));
1307 continue;
1308 }
1309
1310 // Skip macro table if the unit was not cloned.
1311 DIE *OutputUnitDIE = UnitIt->second->getOutputUnitDIE();
1312 if (OutputUnitDIE == nullptr)
1313 continue;
1314
1315 // Update macro attribute of cloned compile unit with the proper offset to
1316 // the macro table.
1317 bool hasDWARFv5Header = false;
1318 for (auto &V : OutputUnitDIE->values()) {
1319 if (V.getAttribute() == dwarf::DW_AT_macro_info) {
1320 V = DIEValue(V.getAttribute(), V.getForm(), DIEInteger(OutOffset));
1321 break;
1322 } else if (V.getAttribute() == dwarf::DW_AT_macros) {
1323 hasDWARFv5Header = true;
1324 V = DIEValue(V.getAttribute(), V.getForm(), DIEInteger(OutOffset));
1325 break;
1326 }
1327 }
1328
1329 // Write DWARFv5 header.
1330 if (hasDWARFv5Header) {
1331 // Write header version.
1332 MS->emitIntValue(Value: List.Header.Version, Size: sizeof(List.Header.Version));
1333 OutOffset += sizeof(List.Header.Version);
1334
1335 uint8_t Flags = List.Header.Flags;
1336
1337 // Check for OPCODE_OPERANDS_TABLE.
1338 if (Flags &
1339 DWARFDebugMacro::HeaderFlagMask::MACRO_OPCODE_OPERANDS_TABLE) {
1340 Flags &= ~DWARFDebugMacro::HeaderFlagMask::MACRO_OPCODE_OPERANDS_TABLE;
1341 warn(Warning: "opcode_operands_table is not supported yet.");
1342 }
1343
1344 // Check for DEBUG_LINE_OFFSET.
1345 std::optional<uint64_t> StmtListOffset;
1346 if (Flags & DWARFDebugMacro::HeaderFlagMask::MACRO_DEBUG_LINE_OFFSET) {
1347 // Get offset to the line table from the cloned compile unit.
1348 for (auto &V : OutputUnitDIE->values()) {
1349 if (V.getAttribute() == dwarf::DW_AT_stmt_list) {
1350 StmtListOffset = V.getDIEInteger().getValue();
1351 break;
1352 }
1353 }
1354
1355 if (!StmtListOffset) {
1356 Flags &= ~DWARFDebugMacro::HeaderFlagMask::MACRO_DEBUG_LINE_OFFSET;
1357 warn(Warning: "couldn`t find line table for macro table.");
1358 }
1359 }
1360
1361 // Write flags.
1362 MS->emitIntValue(Value: Flags, Size: sizeof(Flags));
1363 OutOffset += sizeof(Flags);
1364
1365 // Write offset to line table.
1366 if (StmtListOffset) {
1367 MS->emitIntValue(Value: *StmtListOffset, Size: List.Header.getOffsetByteSize());
1368 OutOffset += List.Header.getOffsetByteSize();
1369 }
1370 }
1371
1372 // Write macro entries.
1373 for (const DWARFDebugMacro::Entry &MacroEntry : List.Macros) {
1374 if (MacroEntry.Type == 0) {
1375 OutOffset += MS->emitULEB128IntValue(Value: MacroEntry.Type);
1376 continue;
1377 }
1378
1379 uint8_t MacroType = MacroEntry.Type;
1380 switch (MacroType) {
1381 default: {
1382 bool HasVendorSpecificExtension =
1383 (!hasDWARFv5Header && MacroType == dwarf::DW_MACINFO_vendor_ext) ||
1384 (hasDWARFv5Header && (MacroType >= dwarf::DW_MACRO_lo_user &&
1385 MacroType <= dwarf::DW_MACRO_hi_user));
1386
1387 if (HasVendorSpecificExtension) {
1388 // Write macinfo type.
1389 MS->emitIntValue(Value: MacroType, Size: 1);
1390 OutOffset++;
1391
1392 // Write vendor extension constant.
1393 OutOffset += MS->emitULEB128IntValue(Value: MacroEntry.ExtConstant);
1394
1395 // Write vendor extension string.
1396 StringRef String = MacroEntry.ExtStr;
1397 MS->emitBytes(Data: String);
1398 MS->emitIntValue(Value: 0, Size: 1);
1399 OutOffset += String.size() + 1;
1400 } else
1401 warn(Warning: "unknown macro type. skip.");
1402 } break;
1403 // debug_macro and debug_macinfo share some common encodings.
1404 // DW_MACRO_define == DW_MACINFO_define
1405 // DW_MACRO_undef == DW_MACINFO_undef
1406 // DW_MACRO_start_file == DW_MACINFO_start_file
1407 // DW_MACRO_end_file == DW_MACINFO_end_file
1408 // For readibility/uniformity we are using DW_MACRO_*.
1409 case dwarf::DW_MACRO_define:
1410 case dwarf::DW_MACRO_undef: {
1411 // Write macinfo type.
1412 MS->emitIntValue(Value: MacroType, Size: 1);
1413 OutOffset++;
1414
1415 // Write source line.
1416 OutOffset += MS->emitULEB128IntValue(Value: MacroEntry.Line);
1417
1418 // Write macro string.
1419 StringRef String = MacroEntry.MacroStr;
1420 MS->emitBytes(Data: String);
1421 MS->emitIntValue(Value: 0, Size: 1);
1422 OutOffset += String.size() + 1;
1423 } break;
1424 case dwarf::DW_MACRO_define_strp:
1425 case dwarf::DW_MACRO_undef_strp:
1426 case dwarf::DW_MACRO_define_strx:
1427 case dwarf::DW_MACRO_undef_strx: {
1428 assert(UnitIt->second->getOrigUnit().getVersion() >= 5);
1429
1430 // DW_MACRO_*_strx forms are not supported currently.
1431 // Convert to *_strp.
1432 switch (MacroType) {
1433 case dwarf::DW_MACRO_define_strx: {
1434 MacroType = dwarf::DW_MACRO_define_strp;
1435 if (!DefAttributeIsReported) {
1436 warn(Warning: "DW_MACRO_define_strx unsupported yet. Convert to "
1437 "DW_MACRO_define_strp.");
1438 DefAttributeIsReported = true;
1439 }
1440 } break;
1441 case dwarf::DW_MACRO_undef_strx: {
1442 MacroType = dwarf::DW_MACRO_undef_strp;
1443 if (!UndefAttributeIsReported) {
1444 warn(Warning: "DW_MACRO_undef_strx unsupported yet. Convert to "
1445 "DW_MACRO_undef_strp.");
1446 UndefAttributeIsReported = true;
1447 }
1448 } break;
1449 default:
1450 // Nothing to do.
1451 break;
1452 }
1453
1454 // Write macinfo type.
1455 MS->emitIntValue(Value: MacroType, Size: 1);
1456 OutOffset++;
1457
1458 // Write source line.
1459 OutOffset += MS->emitULEB128IntValue(Value: MacroEntry.Line);
1460
1461 // Write macro string.
1462 DwarfStringPoolEntryRef EntryRef =
1463 StringPool.getEntry(S: MacroEntry.MacroStr);
1464 MS->emitIntValue(Value: EntryRef.getOffset(), Size: List.Header.getOffsetByteSize());
1465 OutOffset += List.Header.getOffsetByteSize();
1466 break;
1467 }
1468 case dwarf::DW_MACRO_start_file: {
1469 // Write macinfo type.
1470 MS->emitIntValue(Value: MacroType, Size: 1);
1471 OutOffset++;
1472 // Write source line.
1473 OutOffset += MS->emitULEB128IntValue(Value: MacroEntry.Line);
1474 // Write source file id.
1475 OutOffset += MS->emitULEB128IntValue(Value: MacroEntry.File);
1476 } break;
1477 case dwarf::DW_MACRO_end_file: {
1478 // Write macinfo type.
1479 MS->emitIntValue(Value: MacroType, Size: 1);
1480 OutOffset++;
1481 } break;
1482 case dwarf::DW_MACRO_import:
1483 case dwarf::DW_MACRO_import_sup: {
1484 if (!ImportAttributeIsReported) {
1485 warn(Warning: "DW_MACRO_import and DW_MACRO_import_sup are unsupported yet. "
1486 "remove.");
1487 ImportAttributeIsReported = true;
1488 }
1489 } break;
1490 }
1491 }
1492 }
1493}
1494