1 //===- llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp ----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains support for writing Microsoft CodeView debug info.
12 //===----------------------------------------------------------------------===//
14 #include "CodeViewDebug.h"
15 #include "DwarfExpression.h"
16 #include "llvm/ADT/APSInt.h"
17 #include "llvm/ADT/ArrayRef.h"
18 #include "llvm/ADT/DenseMap.h"
19 #include "llvm/ADT/DenseSet.h"
20 #include "llvm/ADT/MapVector.h"
21 #include "llvm/ADT/None.h"
22 #include "llvm/ADT/Optional.h"
23 #include "llvm/ADT/STLExtras.h"
24 #include "llvm/ADT/SmallString.h"
25 #include "llvm/ADT/SmallVector.h"
26 #include "llvm/ADT/StringRef.h"
27 #include "llvm/ADT/TinyPtrVector.h"
28 #include "llvm/ADT/Triple.h"
29 #include "llvm/ADT/Twine.h"
30 #include "llvm/BinaryFormat/COFF.h"
31 #include "llvm/BinaryFormat/Dwarf.h"
32 #include "llvm/CodeGen/AsmPrinter.h"
33 #include "llvm/CodeGen/LexicalScopes.h"
34 #include "llvm/CodeGen/MachineFunction.h"
35 #include "llvm/CodeGen/MachineInstr.h"
36 #include "llvm/CodeGen/MachineModuleInfo.h"
37 #include "llvm/CodeGen/MachineOperand.h"
38 #include "llvm/CodeGen/TargetFrameLowering.h"
39 #include "llvm/CodeGen/TargetLoweringObjectFile.h"
40 #include "llvm/CodeGen/TargetRegisterInfo.h"
41 #include "llvm/CodeGen/TargetSubtargetInfo.h"
42 #include "llvm/Config/llvm-config.h"
43 #include "llvm/DebugInfo/CodeView/CVTypeVisitor.h"
44 #include "llvm/DebugInfo/CodeView/CodeView.h"
45 #include "llvm/DebugInfo/CodeView/ContinuationRecordBuilder.h"
46 #include "llvm/DebugInfo/CodeView/DebugInlineeLinesSubsection.h"
47 #include "llvm/DebugInfo/CodeView/Line.h"
48 #include "llvm/DebugInfo/CodeView/SymbolRecord.h"
49 #include "llvm/DebugInfo/CodeView/TypeDumpVisitor.h"
50 #include "llvm/DebugInfo/CodeView/TypeIndex.h"
51 #include "llvm/DebugInfo/CodeView/TypeRecord.h"
52 #include "llvm/DebugInfo/CodeView/TypeTableCollection.h"
53 #include "llvm/IR/Constants.h"
54 #include "llvm/IR/DataLayout.h"
55 #include "llvm/IR/DebugInfoMetadata.h"
56 #include "llvm/IR/DebugLoc.h"
57 #include "llvm/IR/Function.h"
58 #include "llvm/IR/GlobalValue.h"
59 #include "llvm/IR/GlobalVariable.h"
60 #include "llvm/IR/Metadata.h"
61 #include "llvm/IR/Module.h"
62 #include "llvm/MC/MCAsmInfo.h"
63 #include "llvm/MC/MCContext.h"
64 #include "llvm/MC/MCSectionCOFF.h"
65 #include "llvm/MC/MCStreamer.h"
66 #include "llvm/MC/MCSymbol.h"
67 #include "llvm/Support/BinaryByteStream.h"
68 #include "llvm/Support/BinaryStreamReader.h"
69 #include "llvm/Support/Casting.h"
70 #include "llvm/Support/CommandLine.h"
71 #include "llvm/Support/Compiler.h"
72 #include "llvm/Support/Endian.h"
73 #include "llvm/Support/Error.h"
74 #include "llvm/Support/ErrorHandling.h"
75 #include "llvm/Support/FormatVariadic.h"
76 #include "llvm/Support/SMLoc.h"
77 #include "llvm/Support/ScopedPrinter.h"
78 #include "llvm/Target/TargetMachine.h"
91 using namespace llvm::codeview;
93 static cl::opt<bool> EmitDebugGlobalHashes("emit-codeview-ghash-section",
94 cl::ReallyHidden, cl::init(false));
96 CodeViewDebug::CodeViewDebug(AsmPrinter *AP)
97 : DebugHandlerBase(AP), OS(*Asm->OutStreamer), TypeTable(Allocator) {
98 // If module doesn't have named metadata anchors or COFF debug section
99 // is not available, skip any debug info related stuff.
100 if (!MMI->getModule()->getNamedMetadata("llvm.dbg.cu") ||
101 !AP->getObjFileLowering().getCOFFDebugSymbolsSection()) {
106 // Tell MMI that we have debug info.
107 MMI->setDebugInfoAvailability(true);
110 StringRef CodeViewDebug::getFullFilepath(const DIFile *File) {
111 std::string &Filepath = FileToFilepathMap[File];
112 if (!Filepath.empty())
115 StringRef Dir = File->getDirectory(), Filename = File->getFilename();
117 // Clang emits directory and relative filename info into the IR, but CodeView
118 // operates on full paths. We could change Clang to emit full paths too, but
119 // that would increase the IR size and probably not needed for other users.
120 // For now, just concatenate and canonicalize the path here.
121 if (Filename.find(':') == 1)
124 Filepath = (Dir + "\\" + Filename).str();
126 // Canonicalize the path. We have to do it textually because we may no longer
127 // have access the file in the filesystem.
128 // First, replace all slashes with backslashes.
129 std::replace(Filepath.begin(), Filepath.end(), '/', '\\');
131 // Remove all "\.\" with "\".
133 while ((Cursor = Filepath.find("\\.\\", Cursor)) != std::string::npos)
134 Filepath.erase(Cursor, 2);
136 // Replace all "\XXX\..\" with "\". Don't try too hard though as the original
137 // path should be well-formatted, e.g. start with a drive letter, etc.
139 while ((Cursor = Filepath.find("\\..\\", Cursor)) != std::string::npos) {
140 // Something's wrong if the path starts with "\..\", abort.
144 size_t PrevSlash = Filepath.rfind('\\', Cursor - 1);
145 if (PrevSlash == std::string::npos)
146 // Something's wrong, abort.
149 Filepath.erase(PrevSlash, Cursor + 3 - PrevSlash);
150 // The next ".." might be following the one we've just erased.
154 // Remove all duplicate backslashes.
156 while ((Cursor = Filepath.find("\\\\", Cursor)) != std::string::npos)
157 Filepath.erase(Cursor, 1);
162 unsigned CodeViewDebug::maybeRecordFile(const DIFile *F) {
163 StringRef FullPath = getFullFilepath(F);
164 unsigned NextId = FileIdMap.size() + 1;
165 auto Insertion = FileIdMap.insert(std::make_pair(FullPath, NextId));
166 if (Insertion.second) {
167 // We have to compute the full filepath and emit a .cv_file directive.
168 std::string Checksum = fromHex(F->getChecksum());
169 void *CKMem = OS.getContext().allocate(Checksum.size(), 1);
170 memcpy(CKMem, Checksum.data(), Checksum.size());
171 ArrayRef<uint8_t> ChecksumAsBytes(reinterpret_cast<const uint8_t *>(CKMem),
173 DIFile::ChecksumKind ChecksumKind = F->getChecksumKind();
174 bool Success = OS.EmitCVFileDirective(NextId, FullPath, ChecksumAsBytes,
175 static_cast<unsigned>(ChecksumKind));
177 assert(Success && ".cv_file directive failed");
179 return Insertion.first->second;
182 CodeViewDebug::InlineSite &
183 CodeViewDebug::getInlineSite(const DILocation *InlinedAt,
184 const DISubprogram *Inlinee) {
185 auto SiteInsertion = CurFn->InlineSites.insert({InlinedAt, InlineSite()});
186 InlineSite *Site = &SiteInsertion.first->second;
187 if (SiteInsertion.second) {
188 unsigned ParentFuncId = CurFn->FuncId;
189 if (const DILocation *OuterIA = InlinedAt->getInlinedAt())
191 getInlineSite(OuterIA, InlinedAt->getScope()->getSubprogram())
194 Site->SiteFuncId = NextFuncId++;
195 OS.EmitCVInlineSiteIdDirective(
196 Site->SiteFuncId, ParentFuncId, maybeRecordFile(InlinedAt->getFile()),
197 InlinedAt->getLine(), InlinedAt->getColumn(), SMLoc());
198 Site->Inlinee = Inlinee;
199 InlinedSubprograms.insert(Inlinee);
200 getFuncIdForSubprogram(Inlinee);
205 static StringRef getPrettyScopeName(const DIScope *Scope) {
206 StringRef ScopeName = Scope->getName();
207 if (!ScopeName.empty())
210 switch (Scope->getTag()) {
211 case dwarf::DW_TAG_enumeration_type:
212 case dwarf::DW_TAG_class_type:
213 case dwarf::DW_TAG_structure_type:
214 case dwarf::DW_TAG_union_type:
215 return "<unnamed-tag>";
216 case dwarf::DW_TAG_namespace:
217 return "`anonymous namespace'";
223 static const DISubprogram *getQualifiedNameComponents(
224 const DIScope *Scope, SmallVectorImpl<StringRef> &QualifiedNameComponents) {
225 const DISubprogram *ClosestSubprogram = nullptr;
226 while (Scope != nullptr) {
227 if (ClosestSubprogram == nullptr)
228 ClosestSubprogram = dyn_cast<DISubprogram>(Scope);
229 StringRef ScopeName = getPrettyScopeName(Scope);
230 if (!ScopeName.empty())
231 QualifiedNameComponents.push_back(ScopeName);
232 Scope = Scope->getScope().resolve();
234 return ClosestSubprogram;
237 static std::string getQualifiedName(ArrayRef<StringRef> QualifiedNameComponents,
238 StringRef TypeName) {
239 std::string FullyQualifiedName;
240 for (StringRef QualifiedNameComponent :
241 llvm::reverse(QualifiedNameComponents)) {
242 FullyQualifiedName.append(QualifiedNameComponent);
243 FullyQualifiedName.append("::");
245 FullyQualifiedName.append(TypeName);
246 return FullyQualifiedName;
249 static std::string getFullyQualifiedName(const DIScope *Scope, StringRef Name) {
250 SmallVector<StringRef, 5> QualifiedNameComponents;
251 getQualifiedNameComponents(Scope, QualifiedNameComponents);
252 return getQualifiedName(QualifiedNameComponents, Name);
255 struct CodeViewDebug::TypeLoweringScope {
256 TypeLoweringScope(CodeViewDebug &CVD) : CVD(CVD) { ++CVD.TypeEmissionLevel; }
257 ~TypeLoweringScope() {
258 // Don't decrement TypeEmissionLevel until after emitting deferred types, so
259 // inner TypeLoweringScopes don't attempt to emit deferred types.
260 if (CVD.TypeEmissionLevel == 1)
261 CVD.emitDeferredCompleteTypes();
262 --CVD.TypeEmissionLevel;
267 static std::string getFullyQualifiedName(const DIScope *Ty) {
268 const DIScope *Scope = Ty->getScope().resolve();
269 return getFullyQualifiedName(Scope, getPrettyScopeName(Ty));
272 TypeIndex CodeViewDebug::getScopeIndex(const DIScope *Scope) {
273 // No scope means global scope and that uses the zero index.
274 if (!Scope || isa<DIFile>(Scope))
277 assert(!isa<DIType>(Scope) && "shouldn't make a namespace scope for a type");
279 // Check if we've already translated this scope.
280 auto I = TypeIndices.find({Scope, nullptr});
281 if (I != TypeIndices.end())
284 // Build the fully qualified name of the scope.
285 std::string ScopeName = getFullyQualifiedName(Scope);
286 StringIdRecord SID(TypeIndex(), ScopeName);
287 auto TI = TypeTable.writeLeafType(SID);
288 return recordTypeIndexForDINode(Scope, TI);
291 TypeIndex CodeViewDebug::getFuncIdForSubprogram(const DISubprogram *SP) {
294 // Check if we've already translated this subprogram.
295 auto I = TypeIndices.find({SP, nullptr});
296 if (I != TypeIndices.end())
299 // The display name includes function template arguments. Drop them to match
301 StringRef DisplayName = SP->getName().split('<').first;
303 const DIScope *Scope = SP->getScope().resolve();
305 if (const auto *Class = dyn_cast_or_null<DICompositeType>(Scope)) {
306 // If the scope is a DICompositeType, then this must be a method. Member
307 // function types take some special handling, and require access to the
309 TypeIndex ClassType = getTypeIndex(Class);
310 MemberFuncIdRecord MFuncId(ClassType, getMemberFunctionType(SP, Class),
312 TI = TypeTable.writeLeafType(MFuncId);
314 // Otherwise, this must be a free function.
315 TypeIndex ParentScope = getScopeIndex(Scope);
316 FuncIdRecord FuncId(ParentScope, getTypeIndex(SP->getType()), DisplayName);
317 TI = TypeTable.writeLeafType(FuncId);
320 return recordTypeIndexForDINode(SP, TI);
323 TypeIndex CodeViewDebug::getMemberFunctionType(const DISubprogram *SP,
324 const DICompositeType *Class) {
325 // Always use the method declaration as the key for the function type. The
326 // method declaration contains the this adjustment.
327 if (SP->getDeclaration())
328 SP = SP->getDeclaration();
329 assert(!SP->getDeclaration() && "should use declaration as key");
331 // Key the MemberFunctionRecord into the map as {SP, Class}. It won't collide
332 // with the MemberFuncIdRecord, which is keyed in as {SP, nullptr}.
333 auto I = TypeIndices.find({SP, Class});
334 if (I != TypeIndices.end())
337 // Make sure complete type info for the class is emitted *after* the member
338 // function type, as the complete class type is likely to reference this
339 // member function type.
340 TypeLoweringScope S(*this);
341 const bool IsStaticMethod = (SP->getFlags() & DINode::FlagStaticMember) != 0;
342 TypeIndex TI = lowerTypeMemberFunction(
343 SP->getType(), Class, SP->getThisAdjustment(), IsStaticMethod);
344 return recordTypeIndexForDINode(SP, TI, Class);
347 TypeIndex CodeViewDebug::recordTypeIndexForDINode(const DINode *Node,
349 const DIType *ClassTy) {
350 auto InsertResult = TypeIndices.insert({{Node, ClassTy}, TI});
352 assert(InsertResult.second && "DINode was already assigned a type index");
356 unsigned CodeViewDebug::getPointerSizeInBytes() {
357 return MMI->getModule()->getDataLayout().getPointerSizeInBits() / 8;
360 void CodeViewDebug::recordLocalVariable(LocalVariable &&Var,
361 const DILocation *InlinedAt) {
363 // This variable was inlined. Associate it with the InlineSite.
364 const DISubprogram *Inlinee = Var.DIVar->getScope()->getSubprogram();
365 InlineSite &Site = getInlineSite(InlinedAt, Inlinee);
366 Site.InlinedLocals.emplace_back(Var);
368 // This variable goes in the main ProcSym.
369 CurFn->Locals.emplace_back(Var);
373 static void addLocIfNotPresent(SmallVectorImpl<const DILocation *> &Locs,
374 const DILocation *Loc) {
375 auto B = Locs.begin(), E = Locs.end();
376 if (std::find(B, E, Loc) == E)
380 void CodeViewDebug::maybeRecordLocation(const DebugLoc &DL,
381 const MachineFunction *MF) {
382 // Skip this instruction if it has the same location as the previous one.
383 if (!DL || DL == PrevInstLoc)
386 const DIScope *Scope = DL.get()->getScope();
390 // Skip this line if it is longer than the maximum we can record.
391 LineInfo LI(DL.getLine(), DL.getLine(), /*IsStatement=*/true);
392 if (LI.getStartLine() != DL.getLine() || LI.isAlwaysStepInto() ||
393 LI.isNeverStepInto())
396 ColumnInfo CI(DL.getCol(), /*EndColumn=*/0);
397 if (CI.getStartColumn() != DL.getCol())
400 if (!CurFn->HaveLineInfo)
401 CurFn->HaveLineInfo = true;
403 if (PrevInstLoc.get() && PrevInstLoc->getFile() == DL->getFile())
404 FileId = CurFn->LastFileId;
406 FileId = CurFn->LastFileId = maybeRecordFile(DL->getFile());
409 unsigned FuncId = CurFn->FuncId;
410 if (const DILocation *SiteLoc = DL->getInlinedAt()) {
411 const DILocation *Loc = DL.get();
413 // If this location was actually inlined from somewhere else, give it the ID
414 // of the inline call site.
416 getInlineSite(SiteLoc, Loc->getScope()->getSubprogram()).SiteFuncId;
418 // Ensure we have links in the tree of inline call sites.
419 bool FirstLoc = true;
420 while ((SiteLoc = Loc->getInlinedAt())) {
422 getInlineSite(SiteLoc, Loc->getScope()->getSubprogram());
424 addLocIfNotPresent(Site.ChildSites, Loc);
428 addLocIfNotPresent(CurFn->ChildSites, Loc);
431 OS.EmitCVLocDirective(FuncId, FileId, DL.getLine(), DL.getCol(),
432 /*PrologueEnd=*/false, /*IsStmt=*/false,
433 DL->getFilename(), SMLoc());
436 void CodeViewDebug::emitCodeViewMagicVersion() {
437 OS.EmitValueToAlignment(4);
438 OS.AddComment("Debug section magic");
439 OS.EmitIntValue(COFF::DEBUG_SECTION_MAGIC, 4);
442 void CodeViewDebug::endModule() {
443 if (!Asm || !MMI->hasDebugInfo())
446 assert(Asm != nullptr);
448 // The COFF .debug$S section consists of several subsections, each starting
449 // with a 4-byte control code (e.g. 0xF1, 0xF2, etc) and then a 4-byte length
450 // of the payload followed by the payload itself. The subsections are 4-byte
453 // Use the generic .debug$S section, and make a subsection for all the inlined
455 switchToDebugSectionForSymbol(nullptr);
457 MCSymbol *CompilerInfo = beginCVSubsection(DebugSubsectionKind::Symbols);
458 emitCompilerInformation();
459 endCVSubsection(CompilerInfo);
461 emitInlineeLinesSubsection();
463 // Emit per-function debug information.
464 for (auto &P : FnDebugInfo)
465 if (!P.first->isDeclarationForLinker())
466 emitDebugInfoForFunction(P.first, P.second);
468 // Emit global variable debug information.
469 setCurrentSubprogram(nullptr);
470 emitDebugInfoForGlobals();
472 // Emit retained types.
473 emitDebugInfoForRetainedTypes();
475 // Switch back to the generic .debug$S section after potentially processing
476 // comdat symbol sections.
477 switchToDebugSectionForSymbol(nullptr);
479 // Emit UDT records for any types used by global variables.
480 if (!GlobalUDTs.empty()) {
481 MCSymbol *SymbolsEnd = beginCVSubsection(DebugSubsectionKind::Symbols);
482 emitDebugInfoForUDTs(GlobalUDTs);
483 endCVSubsection(SymbolsEnd);
486 // This subsection holds a file index to offset in string table table.
487 OS.AddComment("File index to string table offset subsection");
488 OS.EmitCVFileChecksumsDirective();
490 // This subsection holds the string table.
491 OS.AddComment("String table");
492 OS.EmitCVStringTableDirective();
494 // Emit type information and hashes last, so that any types we translate while
495 // emitting function info are included.
496 emitTypeInformation();
498 if (EmitDebugGlobalHashes)
499 emitTypeGlobalHashes();
504 static void emitNullTerminatedSymbolName(MCStreamer &OS, StringRef S) {
505 // The maximum CV record length is 0xFF00. Most of the strings we emit appear
506 // after a fixed length portion of the record. The fixed length portion should
507 // always be less than 0xF00 (3840) bytes, so truncate the string so that the
508 // overall record size is less than the maximum allowed.
509 unsigned MaxFixedRecordLength = 0xF00;
510 SmallString<32> NullTerminatedString(
511 S.take_front(MaxRecordLength - MaxFixedRecordLength - 1));
512 NullTerminatedString.push_back('\0');
513 OS.EmitBytes(NullTerminatedString);
516 void CodeViewDebug::emitTypeInformation() {
517 if (TypeTable.empty())
520 // Start the .debug$T section with 0x4.
521 OS.SwitchSection(Asm->getObjFileLowering().getCOFFDebugTypesSection());
522 emitCodeViewMagicVersion();
524 SmallString<8> CommentPrefix;
525 if (OS.isVerboseAsm()) {
526 CommentPrefix += '\t';
527 CommentPrefix += Asm->MAI->getCommentString();
528 CommentPrefix += ' ';
531 TypeTableCollection Table(TypeTable.records());
532 Optional<TypeIndex> B = Table.getFirst();
534 // This will fail if the record data is invalid.
535 CVType Record = Table.getType(*B);
537 if (OS.isVerboseAsm()) {
538 // Emit a block comment describing the type record for readability.
539 SmallString<512> CommentBlock;
540 raw_svector_ostream CommentOS(CommentBlock);
541 ScopedPrinter SP(CommentOS);
542 SP.setPrefix(CommentPrefix);
543 TypeDumpVisitor TDV(Table, &SP, false);
545 Error E = codeview::visitTypeRecord(Record, *B, TDV);
547 logAllUnhandledErrors(std::move(E), errs(), "error: ");
548 llvm_unreachable("produced malformed type record");
550 // emitRawComment will insert its own tab and comment string before
551 // the first line, so strip off our first one. It also prints its own
554 CommentOS.str().drop_front(CommentPrefix.size() - 1).rtrim());
556 OS.EmitBinaryData(Record.str_data());
557 B = Table.getNext(*B);
561 void CodeViewDebug::emitTypeGlobalHashes() {
562 if (TypeTable.empty())
565 // Start the .debug$H section with the version and hash algorithm, currently
566 // hardcoded to version 0, SHA1.
567 OS.SwitchSection(Asm->getObjFileLowering().getCOFFGlobalTypeHashesSection());
569 OS.EmitValueToAlignment(4);
570 OS.AddComment("Magic");
571 OS.EmitIntValue(COFF::DEBUG_HASHES_SECTION_MAGIC, 4);
572 OS.AddComment("Section Version");
573 OS.EmitIntValue(0, 2);
574 OS.AddComment("Hash Algorithm");
575 OS.EmitIntValue(uint16_t(GlobalTypeHashAlg::SHA1), 2);
577 TypeIndex TI(TypeIndex::FirstNonSimpleIndex);
578 for (const auto &GHR : TypeTable.hashes()) {
579 if (OS.isVerboseAsm()) {
580 // Emit an EOL-comment describing which TypeIndex this hash corresponds
581 // to, as well as the stringified SHA1 hash.
582 SmallString<32> Comment;
583 raw_svector_ostream CommentOS(Comment);
584 CommentOS << formatv("{0:X+} [{1}]", TI.getIndex(), GHR);
585 OS.AddComment(Comment);
588 assert(GHR.Hash.size() % 20 == 0);
589 StringRef S(reinterpret_cast<const char *>(GHR.Hash.data()),
591 OS.EmitBinaryData(S);
595 static SourceLanguage MapDWLangToCVLang(unsigned DWLang) {
597 case dwarf::DW_LANG_C:
598 case dwarf::DW_LANG_C89:
599 case dwarf::DW_LANG_C99:
600 case dwarf::DW_LANG_C11:
601 case dwarf::DW_LANG_ObjC:
602 return SourceLanguage::C;
603 case dwarf::DW_LANG_C_plus_plus:
604 case dwarf::DW_LANG_C_plus_plus_03:
605 case dwarf::DW_LANG_C_plus_plus_11:
606 case dwarf::DW_LANG_C_plus_plus_14:
607 return SourceLanguage::Cpp;
608 case dwarf::DW_LANG_Fortran77:
609 case dwarf::DW_LANG_Fortran90:
610 case dwarf::DW_LANG_Fortran03:
611 case dwarf::DW_LANG_Fortran08:
612 return SourceLanguage::Fortran;
613 case dwarf::DW_LANG_Pascal83:
614 return SourceLanguage::Pascal;
615 case dwarf::DW_LANG_Cobol74:
616 case dwarf::DW_LANG_Cobol85:
617 return SourceLanguage::Cobol;
618 case dwarf::DW_LANG_Java:
619 return SourceLanguage::Java;
620 case dwarf::DW_LANG_D:
621 return SourceLanguage::D;
623 // There's no CodeView representation for this language, and CV doesn't
624 // have an "unknown" option for the language field, so we'll use MASM,
625 // as it's very low level.
626 return SourceLanguage::Masm;
634 } // end anonymous namespace
636 // Takes a StringRef like "clang 4.0.0.0 (other nonsense 123)" and parses out
637 // the version number.
638 static Version parseVersion(StringRef Name) {
641 for (const char C : Name) {
644 V.Part[N] += C - '0';
645 } else if (C == '.') {
655 static CPUType mapArchToCVCPUType(Triple::ArchType Type) {
657 case Triple::ArchType::x86:
658 return CPUType::Pentium3;
659 case Triple::ArchType::x86_64:
661 case Triple::ArchType::thumb:
662 return CPUType::Thumb;
663 case Triple::ArchType::aarch64:
664 return CPUType::ARM64;
666 report_fatal_error("target architecture doesn't map to a CodeView CPUType");
670 void CodeViewDebug::emitCompilerInformation() {
671 MCContext &Context = MMI->getContext();
672 MCSymbol *CompilerBegin = Context.createTempSymbol(),
673 *CompilerEnd = Context.createTempSymbol();
674 OS.AddComment("Record length");
675 OS.emitAbsoluteSymbolDiff(CompilerEnd, CompilerBegin, 2);
676 OS.EmitLabel(CompilerBegin);
677 OS.AddComment("Record kind: S_COMPILE3");
678 OS.EmitIntValue(SymbolKind::S_COMPILE3, 2);
681 NamedMDNode *CUs = MMI->getModule()->getNamedMetadata("llvm.dbg.cu");
682 const MDNode *Node = *CUs->operands().begin();
683 const auto *CU = cast<DICompileUnit>(Node);
685 // The low byte of the flags indicates the source language.
686 Flags = MapDWLangToCVLang(CU->getSourceLanguage());
687 // TODO: Figure out which other flags need to be set.
689 OS.AddComment("Flags and language");
690 OS.EmitIntValue(Flags, 4);
692 OS.AddComment("CPUType");
694 mapArchToCVCPUType(Triple(MMI->getModule()->getTargetTriple()).getArch());
695 OS.EmitIntValue(static_cast<uint64_t>(CPU), 2);
697 StringRef CompilerVersion = CU->getProducer();
698 Version FrontVer = parseVersion(CompilerVersion);
699 OS.AddComment("Frontend version");
700 for (int N = 0; N < 4; ++N)
701 OS.EmitIntValue(FrontVer.Part[N], 2);
703 // Some Microsoft tools, like Binscope, expect a backend version number of at
704 // least 8.something, so we'll coerce the LLVM version into a form that
705 // guarantees it'll be big enough without really lying about the version.
706 int Major = 1000 * LLVM_VERSION_MAJOR +
707 10 * LLVM_VERSION_MINOR +
709 // Clamp it for builds that use unusually large version numbers.
710 Major = std::min<int>(Major, std::numeric_limits<uint16_t>::max());
711 Version BackVer = {{ Major, 0, 0, 0 }};
712 OS.AddComment("Backend version");
713 for (int N = 0; N < 4; ++N)
714 OS.EmitIntValue(BackVer.Part[N], 2);
716 OS.AddComment("Null-terminated compiler version string");
717 emitNullTerminatedSymbolName(OS, CompilerVersion);
719 OS.EmitLabel(CompilerEnd);
722 void CodeViewDebug::emitInlineeLinesSubsection() {
723 if (InlinedSubprograms.empty())
726 OS.AddComment("Inlinee lines subsection");
727 MCSymbol *InlineEnd = beginCVSubsection(DebugSubsectionKind::InlineeLines);
729 // We emit the checksum info for files. This is used by debuggers to
730 // determine if a pdb matches the source before loading it. Visual Studio,
731 // for instance, will display a warning that the breakpoints are not valid if
732 // the pdb does not match the source.
733 OS.AddComment("Inlinee lines signature");
734 OS.EmitIntValue(unsigned(InlineeLinesSignature::Normal), 4);
736 for (const DISubprogram *SP : InlinedSubprograms) {
737 assert(TypeIndices.count({SP, nullptr}));
738 TypeIndex InlineeIdx = TypeIndices[{SP, nullptr}];
741 unsigned FileId = maybeRecordFile(SP->getFile());
742 OS.AddComment("Inlined function " + SP->getName() + " starts at " +
743 SP->getFilename() + Twine(':') + Twine(SP->getLine()));
745 OS.AddComment("Type index of inlined function");
746 OS.EmitIntValue(InlineeIdx.getIndex(), 4);
747 OS.AddComment("Offset into filechecksum table");
748 OS.EmitCVFileChecksumOffsetDirective(FileId);
749 OS.AddComment("Starting line number");
750 OS.EmitIntValue(SP->getLine(), 4);
753 endCVSubsection(InlineEnd);
756 void CodeViewDebug::emitInlinedCallSite(const FunctionInfo &FI,
757 const DILocation *InlinedAt,
758 const InlineSite &Site) {
759 MCSymbol *InlineBegin = MMI->getContext().createTempSymbol(),
760 *InlineEnd = MMI->getContext().createTempSymbol();
762 assert(TypeIndices.count({Site.Inlinee, nullptr}));
763 TypeIndex InlineeIdx = TypeIndices[{Site.Inlinee, nullptr}];
766 OS.AddComment("Record length");
767 OS.emitAbsoluteSymbolDiff(InlineEnd, InlineBegin, 2); // RecordLength
768 OS.EmitLabel(InlineBegin);
769 OS.AddComment("Record kind: S_INLINESITE");
770 OS.EmitIntValue(SymbolKind::S_INLINESITE, 2); // RecordKind
772 OS.AddComment("PtrParent");
773 OS.EmitIntValue(0, 4);
774 OS.AddComment("PtrEnd");
775 OS.EmitIntValue(0, 4);
776 OS.AddComment("Inlinee type index");
777 OS.EmitIntValue(InlineeIdx.getIndex(), 4);
779 unsigned FileId = maybeRecordFile(Site.Inlinee->getFile());
780 unsigned StartLineNum = Site.Inlinee->getLine();
782 OS.EmitCVInlineLinetableDirective(Site.SiteFuncId, FileId, StartLineNum,
785 OS.EmitLabel(InlineEnd);
787 emitLocalVariableList(Site.InlinedLocals);
789 // Recurse on child inlined call sites before closing the scope.
790 for (const DILocation *ChildSite : Site.ChildSites) {
791 auto I = FI.InlineSites.find(ChildSite);
792 assert(I != FI.InlineSites.end() &&
793 "child site not in function inline site map");
794 emitInlinedCallSite(FI, ChildSite, I->second);
798 OS.AddComment("Record length");
799 OS.EmitIntValue(2, 2); // RecordLength
800 OS.AddComment("Record kind: S_INLINESITE_END");
801 OS.EmitIntValue(SymbolKind::S_INLINESITE_END, 2); // RecordKind
804 void CodeViewDebug::switchToDebugSectionForSymbol(const MCSymbol *GVSym) {
805 // If we have a symbol, it may be in a section that is COMDAT. If so, find the
806 // comdat key. A section may be comdat because of -ffunction-sections or
807 // because it is comdat in the IR.
808 MCSectionCOFF *GVSec =
809 GVSym ? dyn_cast<MCSectionCOFF>(&GVSym->getSection()) : nullptr;
810 const MCSymbol *KeySym = GVSec ? GVSec->getCOMDATSymbol() : nullptr;
812 MCSectionCOFF *DebugSec = cast<MCSectionCOFF>(
813 Asm->getObjFileLowering().getCOFFDebugSymbolsSection());
814 DebugSec = OS.getContext().getAssociativeCOFFSection(DebugSec, KeySym);
816 OS.SwitchSection(DebugSec);
818 // Emit the magic version number if this is the first time we've switched to
820 if (ComdatDebugSections.insert(DebugSec).second)
821 emitCodeViewMagicVersion();
824 void CodeViewDebug::emitDebugInfoForFunction(const Function *GV,
826 // For each function there is a separate subsection
827 // which holds the PC to file:line table.
828 const MCSymbol *Fn = Asm->getSymbol(GV);
831 // Switch to the to a comdat section, if appropriate.
832 switchToDebugSectionForSymbol(Fn);
834 std::string FuncName;
835 auto *SP = GV->getSubprogram();
837 setCurrentSubprogram(SP);
839 // If we have a display name, build the fully qualified name by walking the
841 if (!SP->getName().empty())
843 getFullyQualifiedName(SP->getScope().resolve(), SP->getName());
845 // If our DISubprogram name is empty, use the mangled name.
846 if (FuncName.empty())
847 FuncName = GlobalValue::dropLLVMManglingEscape(GV->getName());
849 // Emit FPO data, but only on 32-bit x86. No other platforms use it.
850 if (Triple(MMI->getModule()->getTargetTriple()).getArch() == Triple::x86)
851 OS.EmitCVFPOData(Fn);
853 // Emit a symbol subsection, required by VS2012+ to find function boundaries.
854 OS.AddComment("Symbol subsection for " + Twine(FuncName));
855 MCSymbol *SymbolsEnd = beginCVSubsection(DebugSubsectionKind::Symbols);
857 MCSymbol *ProcRecordBegin = MMI->getContext().createTempSymbol(),
858 *ProcRecordEnd = MMI->getContext().createTempSymbol();
859 OS.AddComment("Record length");
860 OS.emitAbsoluteSymbolDiff(ProcRecordEnd, ProcRecordBegin, 2);
861 OS.EmitLabel(ProcRecordBegin);
863 if (GV->hasLocalLinkage()) {
864 OS.AddComment("Record kind: S_LPROC32_ID");
865 OS.EmitIntValue(unsigned(SymbolKind::S_LPROC32_ID), 2);
867 OS.AddComment("Record kind: S_GPROC32_ID");
868 OS.EmitIntValue(unsigned(SymbolKind::S_GPROC32_ID), 2);
871 // These fields are filled in by tools like CVPACK which run after the fact.
872 OS.AddComment("PtrParent");
873 OS.EmitIntValue(0, 4);
874 OS.AddComment("PtrEnd");
875 OS.EmitIntValue(0, 4);
876 OS.AddComment("PtrNext");
877 OS.EmitIntValue(0, 4);
878 // This is the important bit that tells the debugger where the function
879 // code is located and what's its size:
880 OS.AddComment("Code size");
881 OS.emitAbsoluteSymbolDiff(FI.End, Fn, 4);
882 OS.AddComment("Offset after prologue");
883 OS.EmitIntValue(0, 4);
884 OS.AddComment("Offset before epilogue");
885 OS.EmitIntValue(0, 4);
886 OS.AddComment("Function type index");
887 OS.EmitIntValue(getFuncIdForSubprogram(GV->getSubprogram()).getIndex(), 4);
888 OS.AddComment("Function section relative address");
889 OS.EmitCOFFSecRel32(Fn, /*Offset=*/0);
890 OS.AddComment("Function section index");
891 OS.EmitCOFFSectionIndex(Fn);
892 OS.AddComment("Flags");
893 OS.EmitIntValue(0, 1);
894 // Emit the function display name as a null-terminated string.
895 OS.AddComment("Function name");
896 // Truncate the name so we won't overflow the record length field.
897 emitNullTerminatedSymbolName(OS, FuncName);
898 OS.EmitLabel(ProcRecordEnd);
900 emitLocalVariableList(FI.Locals);
902 // Emit inlined call site information. Only emit functions inlined directly
903 // into the parent function. We'll emit the other sites recursively as part
904 // of their parent inline site.
905 for (const DILocation *InlinedAt : FI.ChildSites) {
906 auto I = FI.InlineSites.find(InlinedAt);
907 assert(I != FI.InlineSites.end() &&
908 "child site not in function inline site map");
909 emitInlinedCallSite(FI, InlinedAt, I->second);
912 for (auto Annot : FI.Annotations) {
913 MCSymbol *Label = Annot.first;
914 MDTuple *Strs = cast<MDTuple>(Annot.second);
915 MCSymbol *AnnotBegin = MMI->getContext().createTempSymbol(),
916 *AnnotEnd = MMI->getContext().createTempSymbol();
917 OS.AddComment("Record length");
918 OS.emitAbsoluteSymbolDiff(AnnotEnd, AnnotBegin, 2);
919 OS.EmitLabel(AnnotBegin);
920 OS.AddComment("Record kind: S_ANNOTATION");
921 OS.EmitIntValue(SymbolKind::S_ANNOTATION, 2);
922 OS.EmitCOFFSecRel32(Label, /*Offset=*/0);
923 // FIXME: Make sure we don't overflow the max record size.
924 OS.EmitCOFFSectionIndex(Label);
925 OS.EmitIntValue(Strs->getNumOperands(), 2);
926 for (Metadata *MD : Strs->operands()) {
927 // MDStrings are null terminated, so we can do EmitBytes and get the
928 // nice .asciz directive.
929 StringRef Str = cast<MDString>(MD)->getString();
930 assert(Str.data()[Str.size()] == '\0' && "non-nullterminated MDString");
931 OS.EmitBytes(StringRef(Str.data(), Str.size() + 1));
933 OS.EmitLabel(AnnotEnd);
937 emitDebugInfoForUDTs(LocalUDTs);
939 // We're done with this function.
940 OS.AddComment("Record length");
941 OS.EmitIntValue(0x0002, 2);
942 OS.AddComment("Record kind: S_PROC_ID_END");
943 OS.EmitIntValue(unsigned(SymbolKind::S_PROC_ID_END), 2);
945 endCVSubsection(SymbolsEnd);
947 // We have an assembler directive that takes care of the whole line table.
948 OS.EmitCVLinetableDirective(FI.FuncId, Fn, FI.End);
951 CodeViewDebug::LocalVarDefRange
952 CodeViewDebug::createDefRangeMem(uint16_t CVRegister, int Offset) {
955 DR.DataOffset = Offset;
956 assert(DR.DataOffset == Offset && "truncation");
959 DR.CVRegister = CVRegister;
963 CodeViewDebug::LocalVarDefRange
964 CodeViewDebug::createDefRangeGeneral(uint16_t CVRegister, bool InMemory,
965 int Offset, bool IsSubfield,
966 uint16_t StructOffset) {
968 DR.InMemory = InMemory;
969 DR.DataOffset = Offset;
970 DR.IsSubfield = IsSubfield;
971 DR.StructOffset = StructOffset;
972 DR.CVRegister = CVRegister;
976 void CodeViewDebug::collectVariableInfoFromMFTable(
977 DenseSet<InlinedVariable> &Processed) {
978 const MachineFunction &MF = *Asm->MF;
979 const TargetSubtargetInfo &TSI = MF.getSubtarget();
980 const TargetFrameLowering *TFI = TSI.getFrameLowering();
981 const TargetRegisterInfo *TRI = TSI.getRegisterInfo();
983 for (const MachineFunction::VariableDbgInfo &VI : MF.getVariableDbgInfo()) {
986 assert(VI.Var->isValidLocationForIntrinsic(VI.Loc) &&
987 "Expected inlined-at fields to agree");
989 Processed.insert(InlinedVariable(VI.Var, VI.Loc->getInlinedAt()));
990 LexicalScope *Scope = LScopes.findLexicalScope(VI.Loc);
992 // If variable scope is not found then skip this variable.
996 // If the variable has an attached offset expression, extract it.
997 // FIXME: Try to handle DW_OP_deref as well.
998 int64_t ExprOffset = 0;
1000 if (!VI.Expr->extractIfOffset(ExprOffset))
1003 // Get the frame register used and the offset.
1004 unsigned FrameReg = 0;
1005 int FrameOffset = TFI->getFrameIndexReference(*Asm->MF, VI.Slot, FrameReg);
1006 uint16_t CVReg = TRI->getCodeViewRegNum(FrameReg);
1008 // Calculate the label ranges.
1009 LocalVarDefRange DefRange =
1010 createDefRangeMem(CVReg, FrameOffset + ExprOffset);
1011 for (const InsnRange &Range : Scope->getRanges()) {
1012 const MCSymbol *Begin = getLabelBeforeInsn(Range.first);
1013 const MCSymbol *End = getLabelAfterInsn(Range.second);
1014 End = End ? End : Asm->getFunctionEnd();
1015 DefRange.Ranges.emplace_back(Begin, End);
1020 Var.DefRanges.emplace_back(std::move(DefRange));
1021 recordLocalVariable(std::move(Var), VI.Loc->getInlinedAt());
1025 static bool canUseReferenceType(const DbgVariableLocation &Loc) {
1026 return !Loc.LoadChain.empty() && Loc.LoadChain.back() == 0;
1029 static bool needsReferenceType(const DbgVariableLocation &Loc) {
1030 return Loc.LoadChain.size() == 2 && Loc.LoadChain.back() == 0;
1033 void CodeViewDebug::calculateRanges(
1034 LocalVariable &Var, const DbgValueHistoryMap::InstrRanges &Ranges) {
1035 const TargetRegisterInfo *TRI = Asm->MF->getSubtarget().getRegisterInfo();
1037 // Calculate the definition ranges.
1038 for (auto I = Ranges.begin(), E = Ranges.end(); I != E; ++I) {
1039 const InsnRange &Range = *I;
1040 const MachineInstr *DVInst = Range.first;
1041 assert(DVInst->isDebugValue() && "Invalid History entry");
1042 // FIXME: Find a way to represent constant variables, since they are
1043 // relatively common.
1044 Optional<DbgVariableLocation> Location =
1045 DbgVariableLocation::extractFromMachineInstruction(*DVInst);
1049 // CodeView can only express variables in register and variables in memory
1050 // at a constant offset from a register. However, for variables passed
1051 // indirectly by pointer, it is common for that pointer to be spilled to a
1052 // stack location. For the special case of one offseted load followed by a
1053 // zero offset load (a pointer spilled to the stack), we change the type of
1054 // the local variable from a value type to a reference type. This tricks the
1055 // debugger into doing the load for us.
1056 if (Var.UseReferenceType) {
1057 // We're using a reference type. Drop the last zero offset load.
1058 if (canUseReferenceType(*Location))
1059 Location->LoadChain.pop_back();
1062 } else if (needsReferenceType(*Location)) {
1063 // This location can't be expressed without switching to a reference type.
1064 // Start over using that.
1065 Var.UseReferenceType = true;
1066 Var.DefRanges.clear();
1067 calculateRanges(Var, Ranges);
1071 // We can only handle a register or an offseted load of a register.
1072 if (Location->Register == 0 || Location->LoadChain.size() > 1)
1075 LocalVarDefRange DR;
1076 DR.CVRegister = TRI->getCodeViewRegNum(Location->Register);
1077 DR.InMemory = !Location->LoadChain.empty();
1079 !Location->LoadChain.empty() ? Location->LoadChain.back() : 0;
1080 if (Location->FragmentInfo) {
1081 DR.IsSubfield = true;
1082 DR.StructOffset = Location->FragmentInfo->OffsetInBits / 8;
1084 DR.IsSubfield = false;
1085 DR.StructOffset = 0;
1088 if (Var.DefRanges.empty() ||
1089 Var.DefRanges.back().isDifferentLocation(DR)) {
1090 Var.DefRanges.emplace_back(std::move(DR));
1094 // Compute the label range.
1095 const MCSymbol *Begin = getLabelBeforeInsn(Range.first);
1096 const MCSymbol *End = getLabelAfterInsn(Range.second);
1098 // This range is valid until the next overlapping bitpiece. In the
1099 // common case, ranges will not be bitpieces, so they will overlap.
1100 auto J = std::next(I);
1101 const DIExpression *DIExpr = DVInst->getDebugExpression();
1103 !fragmentsOverlap(DIExpr, J->first->getDebugExpression()))
1106 End = getLabelBeforeInsn(J->first);
1108 End = Asm->getFunctionEnd();
1111 // If the last range end is our begin, just extend the last range.
1112 // Otherwise make a new range.
1113 SmallVectorImpl<std::pair<const MCSymbol *, const MCSymbol *>> &R =
1114 Var.DefRanges.back().Ranges;
1115 if (!R.empty() && R.back().second == Begin)
1116 R.back().second = End;
1118 R.emplace_back(Begin, End);
1120 // FIXME: Do more range combining.
1124 void CodeViewDebug::collectVariableInfo(const DISubprogram *SP) {
1125 DenseSet<InlinedVariable> Processed;
1126 // Grab the variable info that was squirreled away in the MMI side-table.
1127 collectVariableInfoFromMFTable(Processed);
1129 for (const auto &I : DbgValues) {
1130 InlinedVariable IV = I.first;
1131 if (Processed.count(IV))
1133 const DILocalVariable *DIVar = IV.first;
1134 const DILocation *InlinedAt = IV.second;
1136 // Instruction ranges, specifying where IV is accessible.
1137 const auto &Ranges = I.second;
1139 LexicalScope *Scope = nullptr;
1141 Scope = LScopes.findInlinedScope(DIVar->getScope(), InlinedAt);
1143 Scope = LScopes.findLexicalScope(DIVar->getScope());
1144 // If variable scope is not found then skip this variable.
1151 calculateRanges(Var, Ranges);
1152 recordLocalVariable(std::move(Var), InlinedAt);
1156 void CodeViewDebug::beginFunctionImpl(const MachineFunction *MF) {
1157 const Function &GV = MF->getFunction();
1158 assert(FnDebugInfo.count(&GV) == false);
1159 CurFn = &FnDebugInfo[&GV];
1160 CurFn->FuncId = NextFuncId++;
1161 CurFn->Begin = Asm->getFunctionBegin();
1163 OS.EmitCVFuncIdDirective(CurFn->FuncId);
1165 // Find the end of the function prolog. First known non-DBG_VALUE and
1166 // non-frame setup location marks the beginning of the function body.
1167 // FIXME: is there a simpler a way to do this? Can we just search
1168 // for the first instruction of the function, not the last of the prolog?
1169 DebugLoc PrologEndLoc;
1170 bool EmptyPrologue = true;
1171 for (const auto &MBB : *MF) {
1172 for (const auto &MI : MBB) {
1173 if (!MI.isMetaInstruction() && !MI.getFlag(MachineInstr::FrameSetup) &&
1175 PrologEndLoc = MI.getDebugLoc();
1177 } else if (!MI.isMetaInstruction()) {
1178 EmptyPrologue = false;
1183 // Record beginning of function if we have a non-empty prologue.
1184 if (PrologEndLoc && !EmptyPrologue) {
1185 DebugLoc FnStartDL = PrologEndLoc.getFnDebugLoc();
1186 maybeRecordLocation(FnStartDL, MF);
1190 static bool shouldEmitUdt(const DIType *T) {
1194 // MSVC does not emit UDTs for typedefs that are scoped to classes.
1195 if (T->getTag() == dwarf::DW_TAG_typedef) {
1196 if (DIScope *Scope = T->getScope().resolve()) {
1197 switch (Scope->getTag()) {
1198 case dwarf::DW_TAG_structure_type:
1199 case dwarf::DW_TAG_class_type:
1200 case dwarf::DW_TAG_union_type:
1207 if (!T || T->isForwardDecl())
1210 const DIDerivedType *DT = dyn_cast<DIDerivedType>(T);
1213 T = DT->getBaseType().resolve();
1218 void CodeViewDebug::addToUDTs(const DIType *Ty) {
1219 // Don't record empty UDTs.
1220 if (Ty->getName().empty())
1222 if (!shouldEmitUdt(Ty))
1225 SmallVector<StringRef, 5> QualifiedNameComponents;
1226 const DISubprogram *ClosestSubprogram = getQualifiedNameComponents(
1227 Ty->getScope().resolve(), QualifiedNameComponents);
1229 std::string FullyQualifiedName =
1230 getQualifiedName(QualifiedNameComponents, getPrettyScopeName(Ty));
1232 if (ClosestSubprogram == nullptr) {
1233 GlobalUDTs.emplace_back(std::move(FullyQualifiedName), Ty);
1234 } else if (ClosestSubprogram == CurrentSubprogram) {
1235 LocalUDTs.emplace_back(std::move(FullyQualifiedName), Ty);
1238 // TODO: What if the ClosestSubprogram is neither null or the current
1239 // subprogram? Currently, the UDT just gets dropped on the floor.
1241 // The current behavior is not desirable. To get maximal fidelity, we would
1242 // need to perform all type translation before beginning emission of .debug$S
1243 // and then make LocalUDTs a member of FunctionInfo
1246 TypeIndex CodeViewDebug::lowerType(const DIType *Ty, const DIType *ClassTy) {
1247 // Generic dispatch for lowering an unknown type.
1248 switch (Ty->getTag()) {
1249 case dwarf::DW_TAG_array_type:
1250 return lowerTypeArray(cast<DICompositeType>(Ty));
1251 case dwarf::DW_TAG_typedef:
1252 return lowerTypeAlias(cast<DIDerivedType>(Ty));
1253 case dwarf::DW_TAG_base_type:
1254 return lowerTypeBasic(cast<DIBasicType>(Ty));
1255 case dwarf::DW_TAG_pointer_type:
1256 if (cast<DIDerivedType>(Ty)->getName() == "__vtbl_ptr_type")
1257 return lowerTypeVFTableShape(cast<DIDerivedType>(Ty));
1259 case dwarf::DW_TAG_reference_type:
1260 case dwarf::DW_TAG_rvalue_reference_type:
1261 return lowerTypePointer(cast<DIDerivedType>(Ty));
1262 case dwarf::DW_TAG_ptr_to_member_type:
1263 return lowerTypeMemberPointer(cast<DIDerivedType>(Ty));
1264 case dwarf::DW_TAG_const_type:
1265 case dwarf::DW_TAG_volatile_type:
1266 // TODO: add support for DW_TAG_atomic_type here
1267 return lowerTypeModifier(cast<DIDerivedType>(Ty));
1268 case dwarf::DW_TAG_subroutine_type:
1270 // The member function type of a member function pointer has no
1272 return lowerTypeMemberFunction(cast<DISubroutineType>(Ty), ClassTy,
1273 /*ThisAdjustment=*/0,
1274 /*IsStaticMethod=*/false);
1276 return lowerTypeFunction(cast<DISubroutineType>(Ty));
1277 case dwarf::DW_TAG_enumeration_type:
1278 return lowerTypeEnum(cast<DICompositeType>(Ty));
1279 case dwarf::DW_TAG_class_type:
1280 case dwarf::DW_TAG_structure_type:
1281 return lowerTypeClass(cast<DICompositeType>(Ty));
1282 case dwarf::DW_TAG_union_type:
1283 return lowerTypeUnion(cast<DICompositeType>(Ty));
1285 // Use the null type index.
1290 TypeIndex CodeViewDebug::lowerTypeAlias(const DIDerivedType *Ty) {
1291 DITypeRef UnderlyingTypeRef = Ty->getBaseType();
1292 TypeIndex UnderlyingTypeIndex = getTypeIndex(UnderlyingTypeRef);
1293 StringRef TypeName = Ty->getName();
1297 if (UnderlyingTypeIndex == TypeIndex(SimpleTypeKind::Int32Long) &&
1298 TypeName == "HRESULT")
1299 return TypeIndex(SimpleTypeKind::HResult);
1300 if (UnderlyingTypeIndex == TypeIndex(SimpleTypeKind::UInt16Short) &&
1301 TypeName == "wchar_t")
1302 return TypeIndex(SimpleTypeKind::WideCharacter);
1304 return UnderlyingTypeIndex;
1307 TypeIndex CodeViewDebug::lowerTypeArray(const DICompositeType *Ty) {
1308 DITypeRef ElementTypeRef = Ty->getBaseType();
1309 TypeIndex ElementTypeIndex = getTypeIndex(ElementTypeRef);
1310 // IndexType is size_t, which depends on the bitness of the target.
1311 TypeIndex IndexType = Asm->TM.getPointerSize() == 8
1312 ? TypeIndex(SimpleTypeKind::UInt64Quad)
1313 : TypeIndex(SimpleTypeKind::UInt32Long);
1315 uint64_t ElementSize = getBaseTypeSize(ElementTypeRef) / 8;
1317 // Add subranges to array type.
1318 DINodeArray Elements = Ty->getElements();
1319 for (int i = Elements.size() - 1; i >= 0; --i) {
1320 const DINode *Element = Elements[i];
1321 assert(Element->getTag() == dwarf::DW_TAG_subrange_type);
1323 const DISubrange *Subrange = cast<DISubrange>(Element);
1324 assert(Subrange->getLowerBound() == 0 &&
1325 "codeview doesn't support subranges with lower bounds");
1326 int64_t Count = Subrange->getCount();
1328 // Forward declarations of arrays without a size and VLAs use a count of -1.
1329 // Emit a count of zero in these cases to match what MSVC does for arrays
1330 // without a size. MSVC doesn't support VLAs, so it's not clear what we
1331 // should do for them even if we could distinguish them.
1335 // Update the element size and element type index for subsequent subranges.
1336 ElementSize *= Count;
1338 // If this is the outermost array, use the size from the array. It will be
1339 // more accurate if we had a VLA or an incomplete element type size.
1340 uint64_t ArraySize =
1341 (i == 0 && ElementSize == 0) ? Ty->getSizeInBits() / 8 : ElementSize;
1343 StringRef Name = (i == 0) ? Ty->getName() : "";
1344 ArrayRecord AR(ElementTypeIndex, IndexType, ArraySize, Name);
1345 ElementTypeIndex = TypeTable.writeLeafType(AR);
1348 return ElementTypeIndex;
1351 TypeIndex CodeViewDebug::lowerTypeBasic(const DIBasicType *Ty) {
1353 dwarf::TypeKind Kind;
1356 Kind = static_cast<dwarf::TypeKind>(Ty->getEncoding());
1357 ByteSize = Ty->getSizeInBits() / 8;
1359 SimpleTypeKind STK = SimpleTypeKind::None;
1361 case dwarf::DW_ATE_address:
1364 case dwarf::DW_ATE_boolean:
1366 case 1: STK = SimpleTypeKind::Boolean8; break;
1367 case 2: STK = SimpleTypeKind::Boolean16; break;
1368 case 4: STK = SimpleTypeKind::Boolean32; break;
1369 case 8: STK = SimpleTypeKind::Boolean64; break;
1370 case 16: STK = SimpleTypeKind::Boolean128; break;
1373 case dwarf::DW_ATE_complex_float:
1375 case 2: STK = SimpleTypeKind::Complex16; break;
1376 case 4: STK = SimpleTypeKind::Complex32; break;
1377 case 8: STK = SimpleTypeKind::Complex64; break;
1378 case 10: STK = SimpleTypeKind::Complex80; break;
1379 case 16: STK = SimpleTypeKind::Complex128; break;
1382 case dwarf::DW_ATE_float:
1384 case 2: STK = SimpleTypeKind::Float16; break;
1385 case 4: STK = SimpleTypeKind::Float32; break;
1386 case 6: STK = SimpleTypeKind::Float48; break;
1387 case 8: STK = SimpleTypeKind::Float64; break;
1388 case 10: STK = SimpleTypeKind::Float80; break;
1389 case 16: STK = SimpleTypeKind::Float128; break;
1392 case dwarf::DW_ATE_signed:
1394 case 1: STK = SimpleTypeKind::SignedCharacter; break;
1395 case 2: STK = SimpleTypeKind::Int16Short; break;
1396 case 4: STK = SimpleTypeKind::Int32; break;
1397 case 8: STK = SimpleTypeKind::Int64Quad; break;
1398 case 16: STK = SimpleTypeKind::Int128Oct; break;
1401 case dwarf::DW_ATE_unsigned:
1403 case 1: STK = SimpleTypeKind::UnsignedCharacter; break;
1404 case 2: STK = SimpleTypeKind::UInt16Short; break;
1405 case 4: STK = SimpleTypeKind::UInt32; break;
1406 case 8: STK = SimpleTypeKind::UInt64Quad; break;
1407 case 16: STK = SimpleTypeKind::UInt128Oct; break;
1410 case dwarf::DW_ATE_UTF:
1412 case 2: STK = SimpleTypeKind::Character16; break;
1413 case 4: STK = SimpleTypeKind::Character32; break;
1416 case dwarf::DW_ATE_signed_char:
1418 STK = SimpleTypeKind::SignedCharacter;
1420 case dwarf::DW_ATE_unsigned_char:
1422 STK = SimpleTypeKind::UnsignedCharacter;
1428 // Apply some fixups based on the source-level type name.
1429 if (STK == SimpleTypeKind::Int32 && Ty->getName() == "long int")
1430 STK = SimpleTypeKind::Int32Long;
1431 if (STK == SimpleTypeKind::UInt32 && Ty->getName() == "long unsigned int")
1432 STK = SimpleTypeKind::UInt32Long;
1433 if (STK == SimpleTypeKind::UInt16Short &&
1434 (Ty->getName() == "wchar_t" || Ty->getName() == "__wchar_t"))
1435 STK = SimpleTypeKind::WideCharacter;
1436 if ((STK == SimpleTypeKind::SignedCharacter ||
1437 STK == SimpleTypeKind::UnsignedCharacter) &&
1438 Ty->getName() == "char")
1439 STK = SimpleTypeKind::NarrowCharacter;
1441 return TypeIndex(STK);
1444 TypeIndex CodeViewDebug::lowerTypePointer(const DIDerivedType *Ty) {
1445 TypeIndex PointeeTI = getTypeIndex(Ty->getBaseType());
1447 // Pointers to simple types can use SimpleTypeMode, rather than having a
1448 // dedicated pointer type record.
1449 if (PointeeTI.isSimple() &&
1450 PointeeTI.getSimpleMode() == SimpleTypeMode::Direct &&
1451 Ty->getTag() == dwarf::DW_TAG_pointer_type) {
1452 SimpleTypeMode Mode = Ty->getSizeInBits() == 64
1453 ? SimpleTypeMode::NearPointer64
1454 : SimpleTypeMode::NearPointer32;
1455 return TypeIndex(PointeeTI.getSimpleKind(), Mode);
1459 Ty->getSizeInBits() == 64 ? PointerKind::Near64 : PointerKind::Near32;
1460 PointerMode PM = PointerMode::Pointer;
1461 switch (Ty->getTag()) {
1462 default: llvm_unreachable("not a pointer tag type");
1463 case dwarf::DW_TAG_pointer_type:
1464 PM = PointerMode::Pointer;
1466 case dwarf::DW_TAG_reference_type:
1467 PM = PointerMode::LValueReference;
1469 case dwarf::DW_TAG_rvalue_reference_type:
1470 PM = PointerMode::RValueReference;
1473 // FIXME: MSVC folds qualifiers into PointerOptions in the context of a method
1474 // 'this' pointer, but not normal contexts. Figure out what we're supposed to
1476 PointerOptions PO = PointerOptions::None;
1477 PointerRecord PR(PointeeTI, PK, PM, PO, Ty->getSizeInBits() / 8);
1478 return TypeTable.writeLeafType(PR);
1481 static PointerToMemberRepresentation
1482 translatePtrToMemberRep(unsigned SizeInBytes, bool IsPMF, unsigned Flags) {
1483 // SizeInBytes being zero generally implies that the member pointer type was
1484 // incomplete, which can happen if it is part of a function prototype. In this
1485 // case, use the unknown model instead of the general model.
1487 switch (Flags & DINode::FlagPtrToMemberRep) {
1489 return SizeInBytes == 0 ? PointerToMemberRepresentation::Unknown
1490 : PointerToMemberRepresentation::GeneralFunction;
1491 case DINode::FlagSingleInheritance:
1492 return PointerToMemberRepresentation::SingleInheritanceFunction;
1493 case DINode::FlagMultipleInheritance:
1494 return PointerToMemberRepresentation::MultipleInheritanceFunction;
1495 case DINode::FlagVirtualInheritance:
1496 return PointerToMemberRepresentation::VirtualInheritanceFunction;
1499 switch (Flags & DINode::FlagPtrToMemberRep) {
1501 return SizeInBytes == 0 ? PointerToMemberRepresentation::Unknown
1502 : PointerToMemberRepresentation::GeneralData;
1503 case DINode::FlagSingleInheritance:
1504 return PointerToMemberRepresentation::SingleInheritanceData;
1505 case DINode::FlagMultipleInheritance:
1506 return PointerToMemberRepresentation::MultipleInheritanceData;
1507 case DINode::FlagVirtualInheritance:
1508 return PointerToMemberRepresentation::VirtualInheritanceData;
1511 llvm_unreachable("invalid ptr to member representation");
1514 TypeIndex CodeViewDebug::lowerTypeMemberPointer(const DIDerivedType *Ty) {
1515 assert(Ty->getTag() == dwarf::DW_TAG_ptr_to_member_type);
1516 TypeIndex ClassTI = getTypeIndex(Ty->getClassType());
1517 TypeIndex PointeeTI = getTypeIndex(Ty->getBaseType(), Ty->getClassType());
1518 PointerKind PK = Asm->TM.getPointerSize() == 8 ? PointerKind::Near64
1519 : PointerKind::Near32;
1520 bool IsPMF = isa<DISubroutineType>(Ty->getBaseType());
1521 PointerMode PM = IsPMF ? PointerMode::PointerToMemberFunction
1522 : PointerMode::PointerToDataMember;
1523 PointerOptions PO = PointerOptions::None; // FIXME
1524 assert(Ty->getSizeInBits() / 8 <= 0xff && "pointer size too big");
1525 uint8_t SizeInBytes = Ty->getSizeInBits() / 8;
1526 MemberPointerInfo MPI(
1527 ClassTI, translatePtrToMemberRep(SizeInBytes, IsPMF, Ty->getFlags()));
1528 PointerRecord PR(PointeeTI, PK, PM, PO, SizeInBytes, MPI);
1529 return TypeTable.writeLeafType(PR);
1532 /// Given a DWARF calling convention, get the CodeView equivalent. If we don't
1533 /// have a translation, use the NearC convention.
1534 static CallingConvention dwarfCCToCodeView(unsigned DwarfCC) {
1536 case dwarf::DW_CC_normal: return CallingConvention::NearC;
1537 case dwarf::DW_CC_BORLAND_msfastcall: return CallingConvention::NearFast;
1538 case dwarf::DW_CC_BORLAND_thiscall: return CallingConvention::ThisCall;
1539 case dwarf::DW_CC_BORLAND_stdcall: return CallingConvention::NearStdCall;
1540 case dwarf::DW_CC_BORLAND_pascal: return CallingConvention::NearPascal;
1541 case dwarf::DW_CC_LLVM_vectorcall: return CallingConvention::NearVector;
1543 return CallingConvention::NearC;
1546 TypeIndex CodeViewDebug::lowerTypeModifier(const DIDerivedType *Ty) {
1547 ModifierOptions Mods = ModifierOptions::None;
1548 bool IsModifier = true;
1549 const DIType *BaseTy = Ty;
1550 while (IsModifier && BaseTy) {
1551 // FIXME: Need to add DWARF tags for __unaligned and _Atomic
1552 switch (BaseTy->getTag()) {
1553 case dwarf::DW_TAG_const_type:
1554 Mods |= ModifierOptions::Const;
1556 case dwarf::DW_TAG_volatile_type:
1557 Mods |= ModifierOptions::Volatile;
1564 BaseTy = cast<DIDerivedType>(BaseTy)->getBaseType().resolve();
1566 TypeIndex ModifiedTI = getTypeIndex(BaseTy);
1567 ModifierRecord MR(ModifiedTI, Mods);
1568 return TypeTable.writeLeafType(MR);
1571 TypeIndex CodeViewDebug::lowerTypeFunction(const DISubroutineType *Ty) {
1572 SmallVector<TypeIndex, 8> ReturnAndArgTypeIndices;
1573 for (DITypeRef ArgTypeRef : Ty->getTypeArray())
1574 ReturnAndArgTypeIndices.push_back(getTypeIndex(ArgTypeRef));
1576 TypeIndex ReturnTypeIndex = TypeIndex::Void();
1577 ArrayRef<TypeIndex> ArgTypeIndices = None;
1578 if (!ReturnAndArgTypeIndices.empty()) {
1579 auto ReturnAndArgTypesRef = makeArrayRef(ReturnAndArgTypeIndices);
1580 ReturnTypeIndex = ReturnAndArgTypesRef.front();
1581 ArgTypeIndices = ReturnAndArgTypesRef.drop_front();
1584 ArgListRecord ArgListRec(TypeRecordKind::ArgList, ArgTypeIndices);
1585 TypeIndex ArgListIndex = TypeTable.writeLeafType(ArgListRec);
1587 CallingConvention CC = dwarfCCToCodeView(Ty->getCC());
1589 ProcedureRecord Procedure(ReturnTypeIndex, CC, FunctionOptions::None,
1590 ArgTypeIndices.size(), ArgListIndex);
1591 return TypeTable.writeLeafType(Procedure);
1594 TypeIndex CodeViewDebug::lowerTypeMemberFunction(const DISubroutineType *Ty,
1595 const DIType *ClassTy,
1597 bool IsStaticMethod) {
1598 // Lower the containing class type.
1599 TypeIndex ClassType = getTypeIndex(ClassTy);
1601 SmallVector<TypeIndex, 8> ReturnAndArgTypeIndices;
1602 for (DITypeRef ArgTypeRef : Ty->getTypeArray())
1603 ReturnAndArgTypeIndices.push_back(getTypeIndex(ArgTypeRef));
1605 TypeIndex ReturnTypeIndex = TypeIndex::Void();
1606 ArrayRef<TypeIndex> ArgTypeIndices = None;
1607 if (!ReturnAndArgTypeIndices.empty()) {
1608 auto ReturnAndArgTypesRef = makeArrayRef(ReturnAndArgTypeIndices);
1609 ReturnTypeIndex = ReturnAndArgTypesRef.front();
1610 ArgTypeIndices = ReturnAndArgTypesRef.drop_front();
1612 TypeIndex ThisTypeIndex;
1613 if (!IsStaticMethod && !ArgTypeIndices.empty()) {
1614 ThisTypeIndex = ArgTypeIndices.front();
1615 ArgTypeIndices = ArgTypeIndices.drop_front();
1618 ArgListRecord ArgListRec(TypeRecordKind::ArgList, ArgTypeIndices);
1619 TypeIndex ArgListIndex = TypeTable.writeLeafType(ArgListRec);
1621 CallingConvention CC = dwarfCCToCodeView(Ty->getCC());
1623 // TODO: Need to use the correct values for FunctionOptions.
1624 MemberFunctionRecord MFR(ReturnTypeIndex, ClassType, ThisTypeIndex, CC,
1625 FunctionOptions::None, ArgTypeIndices.size(),
1626 ArgListIndex, ThisAdjustment);
1627 return TypeTable.writeLeafType(MFR);
1630 TypeIndex CodeViewDebug::lowerTypeVFTableShape(const DIDerivedType *Ty) {
1631 unsigned VSlotCount =
1632 Ty->getSizeInBits() / (8 * Asm->MAI->getCodePointerSize());
1633 SmallVector<VFTableSlotKind, 4> Slots(VSlotCount, VFTableSlotKind::Near);
1635 VFTableShapeRecord VFTSR(Slots);
1636 return TypeTable.writeLeafType(VFTSR);
1639 static MemberAccess translateAccessFlags(unsigned RecordTag, unsigned Flags) {
1640 switch (Flags & DINode::FlagAccessibility) {
1641 case DINode::FlagPrivate: return MemberAccess::Private;
1642 case DINode::FlagPublic: return MemberAccess::Public;
1643 case DINode::FlagProtected: return MemberAccess::Protected;
1645 // If there was no explicit access control, provide the default for the tag.
1646 return RecordTag == dwarf::DW_TAG_class_type ? MemberAccess::Private
1647 : MemberAccess::Public;
1649 llvm_unreachable("access flags are exclusive");
1652 static MethodOptions translateMethodOptionFlags(const DISubprogram *SP) {
1653 if (SP->isArtificial())
1654 return MethodOptions::CompilerGenerated;
1656 // FIXME: Handle other MethodOptions.
1658 return MethodOptions::None;
1661 static MethodKind translateMethodKindFlags(const DISubprogram *SP,
1663 if (SP->getFlags() & DINode::FlagStaticMember)
1664 return MethodKind::Static;
1666 switch (SP->getVirtuality()) {
1667 case dwarf::DW_VIRTUALITY_none:
1669 case dwarf::DW_VIRTUALITY_virtual:
1670 return Introduced ? MethodKind::IntroducingVirtual : MethodKind::Virtual;
1671 case dwarf::DW_VIRTUALITY_pure_virtual:
1672 return Introduced ? MethodKind::PureIntroducingVirtual
1673 : MethodKind::PureVirtual;
1675 llvm_unreachable("unhandled virtuality case");
1678 return MethodKind::Vanilla;
1681 static TypeRecordKind getRecordKind(const DICompositeType *Ty) {
1682 switch (Ty->getTag()) {
1683 case dwarf::DW_TAG_class_type: return TypeRecordKind::Class;
1684 case dwarf::DW_TAG_structure_type: return TypeRecordKind::Struct;
1686 llvm_unreachable("unexpected tag");
1689 /// Return ClassOptions that should be present on both the forward declaration
1690 /// and the defintion of a tag type.
1691 static ClassOptions getCommonClassOptions(const DICompositeType *Ty) {
1692 ClassOptions CO = ClassOptions::None;
1694 // MSVC always sets this flag, even for local types. Clang doesn't always
1695 // appear to give every type a linkage name, which may be problematic for us.
1696 // FIXME: Investigate the consequences of not following them here.
1697 if (!Ty->getIdentifier().empty())
1698 CO |= ClassOptions::HasUniqueName;
1700 // Put the Nested flag on a type if it appears immediately inside a tag type.
1701 // Do not walk the scope chain. Do not attempt to compute ContainsNestedClass
1702 // here. That flag is only set on definitions, and not forward declarations.
1703 const DIScope *ImmediateScope = Ty->getScope().resolve();
1704 if (ImmediateScope && isa<DICompositeType>(ImmediateScope))
1705 CO |= ClassOptions::Nested;
1707 // Put the Scoped flag on function-local types.
1708 for (const DIScope *Scope = ImmediateScope; Scope != nullptr;
1709 Scope = Scope->getScope().resolve()) {
1710 if (isa<DISubprogram>(Scope)) {
1711 CO |= ClassOptions::Scoped;
1719 TypeIndex CodeViewDebug::lowerTypeEnum(const DICompositeType *Ty) {
1720 ClassOptions CO = getCommonClassOptions(Ty);
1722 unsigned EnumeratorCount = 0;
1724 if (Ty->isForwardDecl()) {
1725 CO |= ClassOptions::ForwardReference;
1727 ContinuationRecordBuilder ContinuationBuilder;
1728 ContinuationBuilder.begin(ContinuationRecordKind::FieldList);
1729 for (const DINode *Element : Ty->getElements()) {
1730 // We assume that the frontend provides all members in source declaration
1731 // order, which is what MSVC does.
1732 if (auto *Enumerator = dyn_cast_or_null<DIEnumerator>(Element)) {
1733 EnumeratorRecord ER(MemberAccess::Public,
1734 APSInt::getUnsigned(Enumerator->getValue()),
1735 Enumerator->getName());
1736 ContinuationBuilder.writeMemberType(ER);
1740 FTI = TypeTable.insertRecord(ContinuationBuilder);
1743 std::string FullName = getFullyQualifiedName(Ty);
1745 EnumRecord ER(EnumeratorCount, CO, FTI, FullName, Ty->getIdentifier(),
1746 getTypeIndex(Ty->getBaseType()));
1747 return TypeTable.writeLeafType(ER);
1750 //===----------------------------------------------------------------------===//
1752 //===----------------------------------------------------------------------===//
1754 struct llvm::ClassInfo {
1756 const DIDerivedType *MemberTypeNode;
1757 uint64_t BaseOffset;
1760 using MemberList = std::vector<MemberInfo>;
1762 using MethodsList = TinyPtrVector<const DISubprogram *>;
1763 // MethodName -> MethodsList
1764 using MethodsMap = MapVector<MDString *, MethodsList>;
1767 std::vector<const DIDerivedType *> Inheritance;
1771 // Direct overloaded methods gathered by name.
1776 std::vector<const DIType *> NestedTypes;
1779 void CodeViewDebug::clear() {
1780 assert(CurFn == nullptr);
1782 FnDebugInfo.clear();
1783 FileToFilepathMap.clear();
1786 TypeIndices.clear();
1787 CompleteTypeIndices.clear();
1790 void CodeViewDebug::collectMemberInfo(ClassInfo &Info,
1791 const DIDerivedType *DDTy) {
1792 if (!DDTy->getName().empty()) {
1793 Info.Members.push_back({DDTy, 0});
1796 // An unnamed member must represent a nested struct or union. Add all the
1797 // indirect fields to the current record.
1798 assert((DDTy->getOffsetInBits() % 8) == 0 && "Unnamed bitfield member!");
1799 uint64_t Offset = DDTy->getOffsetInBits();
1800 const DIType *Ty = DDTy->getBaseType().resolve();
1801 const DICompositeType *DCTy = cast<DICompositeType>(Ty);
1802 ClassInfo NestedInfo = collectClassInfo(DCTy);
1803 for (const ClassInfo::MemberInfo &IndirectField : NestedInfo.Members)
1804 Info.Members.push_back(
1805 {IndirectField.MemberTypeNode, IndirectField.BaseOffset + Offset});
1808 ClassInfo CodeViewDebug::collectClassInfo(const DICompositeType *Ty) {
1810 // Add elements to structure type.
1811 DINodeArray Elements = Ty->getElements();
1812 for (auto *Element : Elements) {
1813 // We assume that the frontend provides all members in source declaration
1814 // order, which is what MSVC does.
1817 if (auto *SP = dyn_cast<DISubprogram>(Element)) {
1818 Info.Methods[SP->getRawName()].push_back(SP);
1819 } else if (auto *DDTy = dyn_cast<DIDerivedType>(Element)) {
1820 if (DDTy->getTag() == dwarf::DW_TAG_member) {
1821 collectMemberInfo(Info, DDTy);
1822 } else if (DDTy->getTag() == dwarf::DW_TAG_inheritance) {
1823 Info.Inheritance.push_back(DDTy);
1824 } else if (DDTy->getTag() == dwarf::DW_TAG_pointer_type &&
1825 DDTy->getName() == "__vtbl_ptr_type") {
1826 Info.VShapeTI = getTypeIndex(DDTy);
1827 } else if (DDTy->getTag() == dwarf::DW_TAG_typedef) {
1828 Info.NestedTypes.push_back(DDTy);
1829 } else if (DDTy->getTag() == dwarf::DW_TAG_friend) {
1830 // Ignore friend members. It appears that MSVC emitted info about
1831 // friends in the past, but modern versions do not.
1833 } else if (auto *Composite = dyn_cast<DICompositeType>(Element)) {
1834 Info.NestedTypes.push_back(Composite);
1836 // Skip other unrecognized kinds of elements.
1841 TypeIndex CodeViewDebug::lowerTypeClass(const DICompositeType *Ty) {
1842 // First, construct the forward decl. Don't look into Ty to compute the
1843 // forward decl options, since it might not be available in all TUs.
1844 TypeRecordKind Kind = getRecordKind(Ty);
1846 ClassOptions::ForwardReference | getCommonClassOptions(Ty);
1847 std::string FullName = getFullyQualifiedName(Ty);
1848 ClassRecord CR(Kind, 0, CO, TypeIndex(), TypeIndex(), TypeIndex(), 0,
1849 FullName, Ty->getIdentifier());
1850 TypeIndex FwdDeclTI = TypeTable.writeLeafType(CR);
1851 if (!Ty->isForwardDecl())
1852 DeferredCompleteTypes.push_back(Ty);
1856 TypeIndex CodeViewDebug::lowerCompleteTypeClass(const DICompositeType *Ty) {
1857 // Construct the field list and complete type record.
1858 TypeRecordKind Kind = getRecordKind(Ty);
1859 ClassOptions CO = getCommonClassOptions(Ty);
1862 unsigned FieldCount;
1863 bool ContainsNestedClass;
1864 std::tie(FieldTI, VShapeTI, FieldCount, ContainsNestedClass) =
1865 lowerRecordFieldList(Ty);
1867 if (ContainsNestedClass)
1868 CO |= ClassOptions::ContainsNestedClass;
1870 std::string FullName = getFullyQualifiedName(Ty);
1872 uint64_t SizeInBytes = Ty->getSizeInBits() / 8;
1874 ClassRecord CR(Kind, FieldCount, CO, FieldTI, TypeIndex(), VShapeTI,
1875 SizeInBytes, FullName, Ty->getIdentifier());
1876 TypeIndex ClassTI = TypeTable.writeLeafType(CR);
1878 if (const auto *File = Ty->getFile()) {
1879 StringIdRecord SIDR(TypeIndex(0x0), getFullFilepath(File));
1880 TypeIndex SIDI = TypeTable.writeLeafType(SIDR);
1882 UdtSourceLineRecord USLR(ClassTI, SIDI, Ty->getLine());
1883 TypeTable.writeLeafType(USLR);
1891 TypeIndex CodeViewDebug::lowerTypeUnion(const DICompositeType *Ty) {
1893 ClassOptions::ForwardReference | getCommonClassOptions(Ty);
1894 std::string FullName = getFullyQualifiedName(Ty);
1895 UnionRecord UR(0, CO, TypeIndex(), 0, FullName, Ty->getIdentifier());
1896 TypeIndex FwdDeclTI = TypeTable.writeLeafType(UR);
1897 if (!Ty->isForwardDecl())
1898 DeferredCompleteTypes.push_back(Ty);
1902 TypeIndex CodeViewDebug::lowerCompleteTypeUnion(const DICompositeType *Ty) {
1903 ClassOptions CO = ClassOptions::Sealed | getCommonClassOptions(Ty);
1905 unsigned FieldCount;
1906 bool ContainsNestedClass;
1907 std::tie(FieldTI, std::ignore, FieldCount, ContainsNestedClass) =
1908 lowerRecordFieldList(Ty);
1910 if (ContainsNestedClass)
1911 CO |= ClassOptions::ContainsNestedClass;
1913 uint64_t SizeInBytes = Ty->getSizeInBits() / 8;
1914 std::string FullName = getFullyQualifiedName(Ty);
1916 UnionRecord UR(FieldCount, CO, FieldTI, SizeInBytes, FullName,
1917 Ty->getIdentifier());
1918 TypeIndex UnionTI = TypeTable.writeLeafType(UR);
1920 StringIdRecord SIR(TypeIndex(0x0), getFullFilepath(Ty->getFile()));
1921 TypeIndex SIRI = TypeTable.writeLeafType(SIR);
1923 UdtSourceLineRecord USLR(UnionTI, SIRI, Ty->getLine());
1924 TypeTable.writeLeafType(USLR);
1931 std::tuple<TypeIndex, TypeIndex, unsigned, bool>
1932 CodeViewDebug::lowerRecordFieldList(const DICompositeType *Ty) {
1933 // Manually count members. MSVC appears to count everything that generates a
1934 // field list record. Each individual overload in a method overload group
1935 // contributes to this count, even though the overload group is a single field
1937 unsigned MemberCount = 0;
1938 ClassInfo Info = collectClassInfo(Ty);
1939 ContinuationRecordBuilder ContinuationBuilder;
1940 ContinuationBuilder.begin(ContinuationRecordKind::FieldList);
1942 // Create base classes.
1943 for (const DIDerivedType *I : Info.Inheritance) {
1944 if (I->getFlags() & DINode::FlagVirtual) {
1946 // FIXME: Emit VBPtrOffset when the frontend provides it.
1947 unsigned VBPtrOffset = 0;
1948 // FIXME: Despite the accessor name, the offset is really in bytes.
1949 unsigned VBTableIndex = I->getOffsetInBits() / 4;
1950 auto RecordKind = (I->getFlags() & DINode::FlagIndirectVirtualBase) == DINode::FlagIndirectVirtualBase
1951 ? TypeRecordKind::IndirectVirtualBaseClass
1952 : TypeRecordKind::VirtualBaseClass;
1953 VirtualBaseClassRecord VBCR(
1954 RecordKind, translateAccessFlags(Ty->getTag(), I->getFlags()),
1955 getTypeIndex(I->getBaseType()), getVBPTypeIndex(), VBPtrOffset,
1958 ContinuationBuilder.writeMemberType(VBCR);
1960 assert(I->getOffsetInBits() % 8 == 0 &&
1961 "bases must be on byte boundaries");
1962 BaseClassRecord BCR(translateAccessFlags(Ty->getTag(), I->getFlags()),
1963 getTypeIndex(I->getBaseType()),
1964 I->getOffsetInBits() / 8);
1965 ContinuationBuilder.writeMemberType(BCR);
1970 for (ClassInfo::MemberInfo &MemberInfo : Info.Members) {
1971 const DIDerivedType *Member = MemberInfo.MemberTypeNode;
1972 TypeIndex MemberBaseType = getTypeIndex(Member->getBaseType());
1973 StringRef MemberName = Member->getName();
1974 MemberAccess Access =
1975 translateAccessFlags(Ty->getTag(), Member->getFlags());
1977 if (Member->isStaticMember()) {
1978 StaticDataMemberRecord SDMR(Access, MemberBaseType, MemberName);
1979 ContinuationBuilder.writeMemberType(SDMR);
1984 // Virtual function pointer member.
1985 if ((Member->getFlags() & DINode::FlagArtificial) &&
1986 Member->getName().startswith("_vptr$")) {
1987 VFPtrRecord VFPR(getTypeIndex(Member->getBaseType()));
1988 ContinuationBuilder.writeMemberType(VFPR);
1994 uint64_t MemberOffsetInBits =
1995 Member->getOffsetInBits() + MemberInfo.BaseOffset;
1996 if (Member->isBitField()) {
1997 uint64_t StartBitOffset = MemberOffsetInBits;
1998 if (const auto *CI =
1999 dyn_cast_or_null<ConstantInt>(Member->getStorageOffsetInBits())) {
2000 MemberOffsetInBits = CI->getZExtValue() + MemberInfo.BaseOffset;
2002 StartBitOffset -= MemberOffsetInBits;
2003 BitFieldRecord BFR(MemberBaseType, Member->getSizeInBits(),
2005 MemberBaseType = TypeTable.writeLeafType(BFR);
2007 uint64_t MemberOffsetInBytes = MemberOffsetInBits / 8;
2008 DataMemberRecord DMR(Access, MemberBaseType, MemberOffsetInBytes,
2010 ContinuationBuilder.writeMemberType(DMR);
2015 for (auto &MethodItr : Info.Methods) {
2016 StringRef Name = MethodItr.first->getString();
2018 std::vector<OneMethodRecord> Methods;
2019 for (const DISubprogram *SP : MethodItr.second) {
2020 TypeIndex MethodType = getMemberFunctionType(SP, Ty);
2021 bool Introduced = SP->getFlags() & DINode::FlagIntroducedVirtual;
2023 unsigned VFTableOffset = -1;
2025 VFTableOffset = SP->getVirtualIndex() * getPointerSizeInBytes();
2027 Methods.push_back(OneMethodRecord(
2028 MethodType, translateAccessFlags(Ty->getTag(), SP->getFlags()),
2029 translateMethodKindFlags(SP, Introduced),
2030 translateMethodOptionFlags(SP), VFTableOffset, Name));
2033 assert(!Methods.empty() && "Empty methods map entry");
2034 if (Methods.size() == 1)
2035 ContinuationBuilder.writeMemberType(Methods[0]);
2037 // FIXME: Make this use its own ContinuationBuilder so that
2038 // MethodOverloadList can be split correctly.
2039 MethodOverloadListRecord MOLR(Methods);
2040 TypeIndex MethodList = TypeTable.writeLeafType(MOLR);
2042 OverloadedMethodRecord OMR(Methods.size(), MethodList, Name);
2043 ContinuationBuilder.writeMemberType(OMR);
2047 // Create nested classes.
2048 for (const DIType *Nested : Info.NestedTypes) {
2049 NestedTypeRecord R(getTypeIndex(DITypeRef(Nested)), Nested->getName());
2050 ContinuationBuilder.writeMemberType(R);
2054 TypeIndex FieldTI = TypeTable.insertRecord(ContinuationBuilder);
2055 return std::make_tuple(FieldTI, Info.VShapeTI, MemberCount,
2056 !Info.NestedTypes.empty());
2059 TypeIndex CodeViewDebug::getVBPTypeIndex() {
2060 if (!VBPType.getIndex()) {
2061 // Make a 'const int *' type.
2062 ModifierRecord MR(TypeIndex::Int32(), ModifierOptions::Const);
2063 TypeIndex ModifiedTI = TypeTable.writeLeafType(MR);
2065 PointerKind PK = getPointerSizeInBytes() == 8 ? PointerKind::Near64
2066 : PointerKind::Near32;
2067 PointerMode PM = PointerMode::Pointer;
2068 PointerOptions PO = PointerOptions::None;
2069 PointerRecord PR(ModifiedTI, PK, PM, PO, getPointerSizeInBytes());
2070 VBPType = TypeTable.writeLeafType(PR);
2076 TypeIndex CodeViewDebug::getTypeIndex(DITypeRef TypeRef, DITypeRef ClassTyRef) {
2077 const DIType *Ty = TypeRef.resolve();
2078 const DIType *ClassTy = ClassTyRef.resolve();
2080 // The null DIType is the void type. Don't try to hash it.
2082 return TypeIndex::Void();
2084 // Check if we've already translated this type. Don't try to do a
2085 // get-or-create style insertion that caches the hash lookup across the
2086 // lowerType call. It will update the TypeIndices map.
2087 auto I = TypeIndices.find({Ty, ClassTy});
2088 if (I != TypeIndices.end())
2091 TypeLoweringScope S(*this);
2092 TypeIndex TI = lowerType(Ty, ClassTy);
2093 return recordTypeIndexForDINode(Ty, TI, ClassTy);
2096 TypeIndex CodeViewDebug::getTypeIndexForReferenceTo(DITypeRef TypeRef) {
2097 DIType *Ty = TypeRef.resolve();
2098 PointerRecord PR(getTypeIndex(Ty),
2099 getPointerSizeInBytes() == 8 ? PointerKind::Near64
2100 : PointerKind::Near32,
2101 PointerMode::LValueReference, PointerOptions::None,
2102 Ty->getSizeInBits() / 8);
2103 return TypeTable.writeLeafType(PR);
2106 TypeIndex CodeViewDebug::getCompleteTypeIndex(DITypeRef TypeRef) {
2107 const DIType *Ty = TypeRef.resolve();
2109 // The null DIType is the void type. Don't try to hash it.
2111 return TypeIndex::Void();
2113 // If this is a non-record type, the complete type index is the same as the
2114 // normal type index. Just call getTypeIndex.
2115 switch (Ty->getTag()) {
2116 case dwarf::DW_TAG_class_type:
2117 case dwarf::DW_TAG_structure_type:
2118 case dwarf::DW_TAG_union_type:
2121 return getTypeIndex(Ty);
2124 // Check if we've already translated the complete record type. Lowering a
2125 // complete type should never trigger lowering another complete type, so we
2126 // can reuse the hash table lookup result.
2127 const auto *CTy = cast<DICompositeType>(Ty);
2128 auto InsertResult = CompleteTypeIndices.insert({CTy, TypeIndex()});
2129 if (!InsertResult.second)
2130 return InsertResult.first->second;
2132 TypeLoweringScope S(*this);
2134 // Make sure the forward declaration is emitted first. It's unclear if this
2135 // is necessary, but MSVC does it, and we should follow suit until we can show
2137 TypeIndex FwdDeclTI = getTypeIndex(CTy);
2139 // Just use the forward decl if we don't have complete type info. This might
2140 // happen if the frontend is using modules and expects the complete definition
2141 // to be emitted elsewhere.
2142 if (CTy->isForwardDecl())
2146 switch (CTy->getTag()) {
2147 case dwarf::DW_TAG_class_type:
2148 case dwarf::DW_TAG_structure_type:
2149 TI = lowerCompleteTypeClass(CTy);
2151 case dwarf::DW_TAG_union_type:
2152 TI = lowerCompleteTypeUnion(CTy);
2155 llvm_unreachable("not a record");
2158 InsertResult.first->second = TI;
2162 /// Emit all the deferred complete record types. Try to do this in FIFO order,
2163 /// and do this until fixpoint, as each complete record type typically
2165 /// many other record types.
2166 void CodeViewDebug::emitDeferredCompleteTypes() {
2167 SmallVector<const DICompositeType *, 4> TypesToEmit;
2168 while (!DeferredCompleteTypes.empty()) {
2169 std::swap(DeferredCompleteTypes, TypesToEmit);
2170 for (const DICompositeType *RecordTy : TypesToEmit)
2171 getCompleteTypeIndex(RecordTy);
2172 TypesToEmit.clear();
2176 void CodeViewDebug::emitLocalVariableList(ArrayRef<LocalVariable> Locals) {
2177 // Get the sorted list of parameters and emit them first.
2178 SmallVector<const LocalVariable *, 6> Params;
2179 for (const LocalVariable &L : Locals)
2180 if (L.DIVar->isParameter())
2181 Params.push_back(&L);
2182 std::sort(Params.begin(), Params.end(),
2183 [](const LocalVariable *L, const LocalVariable *R) {
2184 return L->DIVar->getArg() < R->DIVar->getArg();
2186 for (const LocalVariable *L : Params)
2187 emitLocalVariable(*L);
2189 // Next emit all non-parameters in the order that we found them.
2190 for (const LocalVariable &L : Locals)
2191 if (!L.DIVar->isParameter())
2192 emitLocalVariable(L);
2195 void CodeViewDebug::emitLocalVariable(const LocalVariable &Var) {
2196 // LocalSym record, see SymbolRecord.h for more info.
2197 MCSymbol *LocalBegin = MMI->getContext().createTempSymbol(),
2198 *LocalEnd = MMI->getContext().createTempSymbol();
2199 OS.AddComment("Record length");
2200 OS.emitAbsoluteSymbolDiff(LocalEnd, LocalBegin, 2);
2201 OS.EmitLabel(LocalBegin);
2203 OS.AddComment("Record kind: S_LOCAL");
2204 OS.EmitIntValue(unsigned(SymbolKind::S_LOCAL), 2);
2206 LocalSymFlags Flags = LocalSymFlags::None;
2207 if (Var.DIVar->isParameter())
2208 Flags |= LocalSymFlags::IsParameter;
2209 if (Var.DefRanges.empty())
2210 Flags |= LocalSymFlags::IsOptimizedOut;
2212 OS.AddComment("TypeIndex");
2213 TypeIndex TI = Var.UseReferenceType
2214 ? getTypeIndexForReferenceTo(Var.DIVar->getType())
2215 : getCompleteTypeIndex(Var.DIVar->getType());
2216 OS.EmitIntValue(TI.getIndex(), 4);
2217 OS.AddComment("Flags");
2218 OS.EmitIntValue(static_cast<uint16_t>(Flags), 2);
2219 // Truncate the name so we won't overflow the record length field.
2220 emitNullTerminatedSymbolName(OS, Var.DIVar->getName());
2221 OS.EmitLabel(LocalEnd);
2223 // Calculate the on disk prefix of the appropriate def range record. The
2224 // records and on disk formats are described in SymbolRecords.h. BytePrefix
2225 // should be big enough to hold all forms without memory allocation.
2226 SmallString<20> BytePrefix;
2227 for (const LocalVarDefRange &DefRange : Var.DefRanges) {
2229 if (DefRange.InMemory) {
2230 uint16_t RegRelFlags = 0;
2231 if (DefRange.IsSubfield) {
2232 RegRelFlags = DefRangeRegisterRelSym::IsSubfieldFlag |
2233 (DefRange.StructOffset
2234 << DefRangeRegisterRelSym::OffsetInParentShift);
2236 DefRangeRegisterRelSym Sym(S_DEFRANGE_REGISTER_REL);
2237 Sym.Hdr.Register = DefRange.CVRegister;
2238 Sym.Hdr.Flags = RegRelFlags;
2239 Sym.Hdr.BasePointerOffset = DefRange.DataOffset;
2240 ulittle16_t SymKind = ulittle16_t(S_DEFRANGE_REGISTER_REL);
2242 StringRef(reinterpret_cast<const char *>(&SymKind), sizeof(SymKind));
2244 StringRef(reinterpret_cast<const char *>(&Sym.Hdr), sizeof(Sym.Hdr));
2246 assert(DefRange.DataOffset == 0 && "unexpected offset into register");
2247 if (DefRange.IsSubfield) {
2248 // Unclear what matters here.
2249 DefRangeSubfieldRegisterSym Sym(S_DEFRANGE_SUBFIELD_REGISTER);
2250 Sym.Hdr.Register = DefRange.CVRegister;
2251 Sym.Hdr.MayHaveNoName = 0;
2252 Sym.Hdr.OffsetInParent = DefRange.StructOffset;
2254 ulittle16_t SymKind = ulittle16_t(S_DEFRANGE_SUBFIELD_REGISTER);
2255 BytePrefix += StringRef(reinterpret_cast<const char *>(&SymKind),
2257 BytePrefix += StringRef(reinterpret_cast<const char *>(&Sym.Hdr),
2260 // Unclear what matters here.
2261 DefRangeRegisterSym Sym(S_DEFRANGE_REGISTER);
2262 Sym.Hdr.Register = DefRange.CVRegister;
2263 Sym.Hdr.MayHaveNoName = 0;
2264 ulittle16_t SymKind = ulittle16_t(S_DEFRANGE_REGISTER);
2265 BytePrefix += StringRef(reinterpret_cast<const char *>(&SymKind),
2267 BytePrefix += StringRef(reinterpret_cast<const char *>(&Sym.Hdr),
2271 OS.EmitCVDefRangeDirective(DefRange.Ranges, BytePrefix);
2275 void CodeViewDebug::endFunctionImpl(const MachineFunction *MF) {
2276 const Function &GV = MF->getFunction();
2277 assert(FnDebugInfo.count(&GV));
2278 assert(CurFn == &FnDebugInfo[&GV]);
2280 collectVariableInfo(GV.getSubprogram());
2282 // Don't emit anything if we don't have any line tables.
2283 if (!CurFn->HaveLineInfo) {
2284 FnDebugInfo.erase(&GV);
2289 CurFn->Annotations = MF->getCodeViewAnnotations();
2291 CurFn->End = Asm->getFunctionEnd();
2296 void CodeViewDebug::beginInstruction(const MachineInstr *MI) {
2297 DebugHandlerBase::beginInstruction(MI);
2299 // Ignore DBG_VALUE locations and function prologue.
2300 if (!Asm || !CurFn || MI->isDebugValue() ||
2301 MI->getFlag(MachineInstr::FrameSetup))
2304 // If the first instruction of a new MBB has no location, find the first
2305 // instruction with a location and use that.
2306 DebugLoc DL = MI->getDebugLoc();
2307 if (!DL && MI->getParent() != PrevInstBB) {
2308 for (const auto &NextMI : *MI->getParent()) {
2309 if (NextMI.isDebugValue())
2311 DL = NextMI.getDebugLoc();
2316 PrevInstBB = MI->getParent();
2318 // If we still don't have a debug location, don't record a location.
2322 maybeRecordLocation(DL, Asm->MF);
2325 MCSymbol *CodeViewDebug::beginCVSubsection(DebugSubsectionKind Kind) {
2326 MCSymbol *BeginLabel = MMI->getContext().createTempSymbol(),
2327 *EndLabel = MMI->getContext().createTempSymbol();
2328 OS.EmitIntValue(unsigned(Kind), 4);
2329 OS.AddComment("Subsection size");
2330 OS.emitAbsoluteSymbolDiff(EndLabel, BeginLabel, 4);
2331 OS.EmitLabel(BeginLabel);
2335 void CodeViewDebug::endCVSubsection(MCSymbol *EndLabel) {
2336 OS.EmitLabel(EndLabel);
2337 // Every subsection must be aligned to a 4-byte boundary.
2338 OS.EmitValueToAlignment(4);
2341 void CodeViewDebug::emitDebugInfoForUDTs(
2342 ArrayRef<std::pair<std::string, const DIType *>> UDTs) {
2343 for (const auto &UDT : UDTs) {
2344 const DIType *T = UDT.second;
2345 assert(shouldEmitUdt(T));
2347 MCSymbol *UDTRecordBegin = MMI->getContext().createTempSymbol(),
2348 *UDTRecordEnd = MMI->getContext().createTempSymbol();
2349 OS.AddComment("Record length");
2350 OS.emitAbsoluteSymbolDiff(UDTRecordEnd, UDTRecordBegin, 2);
2351 OS.EmitLabel(UDTRecordBegin);
2353 OS.AddComment("Record kind: S_UDT");
2354 OS.EmitIntValue(unsigned(SymbolKind::S_UDT), 2);
2356 OS.AddComment("Type");
2357 OS.EmitIntValue(getCompleteTypeIndex(T).getIndex(), 4);
2359 emitNullTerminatedSymbolName(OS, UDT.first);
2360 OS.EmitLabel(UDTRecordEnd);
2364 void CodeViewDebug::emitDebugInfoForGlobals() {
2365 DenseMap<const DIGlobalVariableExpression *, const GlobalVariable *>
2367 for (const GlobalVariable &GV : MMI->getModule()->globals()) {
2368 SmallVector<DIGlobalVariableExpression *, 1> GVEs;
2369 GV.getDebugInfo(GVEs);
2370 for (const auto *GVE : GVEs)
2371 GlobalMap[GVE] = &GV;
2374 NamedMDNode *CUs = MMI->getModule()->getNamedMetadata("llvm.dbg.cu");
2375 for (const MDNode *Node : CUs->operands()) {
2376 const auto *CU = cast<DICompileUnit>(Node);
2378 // First, emit all globals that are not in a comdat in a single symbol
2379 // substream. MSVC doesn't like it if the substream is empty, so only open
2380 // it if we have at least one global to emit.
2381 switchToDebugSectionForSymbol(nullptr);
2382 MCSymbol *EndLabel = nullptr;
2383 for (const auto *GVE : CU->getGlobalVariables()) {
2384 if (const auto *GV = GlobalMap.lookup(GVE))
2385 if (!GV->hasComdat() && !GV->isDeclarationForLinker()) {
2387 OS.AddComment("Symbol subsection for globals");
2388 EndLabel = beginCVSubsection(DebugSubsectionKind::Symbols);
2390 // FIXME: emitDebugInfoForGlobal() doesn't handle DIExpressions.
2391 emitDebugInfoForGlobal(GVE->getVariable(), GV, Asm->getSymbol(GV));
2395 endCVSubsection(EndLabel);
2397 // Second, emit each global that is in a comdat into its own .debug$S
2398 // section along with its own symbol substream.
2399 for (const auto *GVE : CU->getGlobalVariables()) {
2400 if (const auto *GV = GlobalMap.lookup(GVE)) {
2401 if (GV->hasComdat()) {
2402 MCSymbol *GVSym = Asm->getSymbol(GV);
2403 OS.AddComment("Symbol subsection for " +
2404 Twine(GlobalValue::dropLLVMManglingEscape(GV->getName())));
2405 switchToDebugSectionForSymbol(GVSym);
2406 EndLabel = beginCVSubsection(DebugSubsectionKind::Symbols);
2407 // FIXME: emitDebugInfoForGlobal() doesn't handle DIExpressions.
2408 emitDebugInfoForGlobal(GVE->getVariable(), GV, GVSym);
2409 endCVSubsection(EndLabel);
2416 void CodeViewDebug::emitDebugInfoForRetainedTypes() {
2417 NamedMDNode *CUs = MMI->getModule()->getNamedMetadata("llvm.dbg.cu");
2418 for (const MDNode *Node : CUs->operands()) {
2419 for (auto *Ty : cast<DICompileUnit>(Node)->getRetainedTypes()) {
2420 if (DIType *RT = dyn_cast<DIType>(Ty)) {
2422 // FIXME: Add to global/local DTU list.
2428 void CodeViewDebug::emitDebugInfoForGlobal(const DIGlobalVariable *DIGV,
2429 const GlobalVariable *GV,
2431 // DataSym record, see SymbolRecord.h for more info.
2432 // FIXME: Thread local data, etc
2433 MCSymbol *DataBegin = MMI->getContext().createTempSymbol(),
2434 *DataEnd = MMI->getContext().createTempSymbol();
2435 OS.AddComment("Record length");
2436 OS.emitAbsoluteSymbolDiff(DataEnd, DataBegin, 2);
2437 OS.EmitLabel(DataBegin);
2438 if (DIGV->isLocalToUnit()) {
2439 if (GV->isThreadLocal()) {
2440 OS.AddComment("Record kind: S_LTHREAD32");
2441 OS.EmitIntValue(unsigned(SymbolKind::S_LTHREAD32), 2);
2443 OS.AddComment("Record kind: S_LDATA32");
2444 OS.EmitIntValue(unsigned(SymbolKind::S_LDATA32), 2);
2447 if (GV->isThreadLocal()) {
2448 OS.AddComment("Record kind: S_GTHREAD32");
2449 OS.EmitIntValue(unsigned(SymbolKind::S_GTHREAD32), 2);
2451 OS.AddComment("Record kind: S_GDATA32");
2452 OS.EmitIntValue(unsigned(SymbolKind::S_GDATA32), 2);
2455 OS.AddComment("Type");
2456 OS.EmitIntValue(getCompleteTypeIndex(DIGV->getType()).getIndex(), 4);
2457 OS.AddComment("DataOffset");
2458 OS.EmitCOFFSecRel32(GVSym, /*Offset=*/0);
2459 OS.AddComment("Segment");
2460 OS.EmitCOFFSectionIndex(GVSym);
2461 OS.AddComment("Name");
2462 emitNullTerminatedSymbolName(OS, DIGV->getName());
2463 OS.EmitLabel(DataEnd);