1 //===-- llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp --*- C++ -*--===//
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 "llvm/ADT/TinyPtrVector.h"
16 #include "llvm/DebugInfo/CodeView/CVTypeVisitor.h"
17 #include "llvm/DebugInfo/CodeView/CodeView.h"
18 #include "llvm/DebugInfo/CodeView/Line.h"
19 #include "llvm/DebugInfo/CodeView/SymbolRecord.h"
20 #include "llvm/DebugInfo/CodeView/TypeDumper.h"
21 #include "llvm/DebugInfo/CodeView/TypeIndex.h"
22 #include "llvm/DebugInfo/CodeView/TypeRecord.h"
23 #include "llvm/DebugInfo/CodeView/TypeVisitorCallbacks.h"
24 #include "llvm/DebugInfo/MSF/ByteStream.h"
25 #include "llvm/DebugInfo/MSF/StreamReader.h"
26 #include "llvm/IR/Constants.h"
27 #include "llvm/MC/MCAsmInfo.h"
28 #include "llvm/MC/MCExpr.h"
29 #include "llvm/MC/MCSectionCOFF.h"
30 #include "llvm/MC/MCSymbol.h"
31 #include "llvm/Support/COFF.h"
32 #include "llvm/Support/ScopedPrinter.h"
33 #include "llvm/Target/TargetFrameLowering.h"
34 #include "llvm/Target/TargetRegisterInfo.h"
35 #include "llvm/Target/TargetSubtargetInfo.h"
38 using namespace llvm::codeview;
39 using namespace llvm::msf;
41 CodeViewDebug::CodeViewDebug(AsmPrinter *AP)
42 : DebugHandlerBase(AP), OS(*Asm->OutStreamer), Allocator(),
43 TypeTable(Allocator), CurFn(nullptr) {
44 // If module doesn't have named metadata anchors or COFF debug section
45 // is not available, skip any debug info related stuff.
46 if (!MMI->getModule()->getNamedMetadata("llvm.dbg.cu") ||
47 !AP->getObjFileLowering().getCOFFDebugSymbolsSection()) {
52 // Tell MMI that we have debug info.
53 MMI->setDebugInfoAvailability(true);
56 StringRef CodeViewDebug::getFullFilepath(const DIFile *File) {
57 std::string &Filepath = FileToFilepathMap[File];
58 if (!Filepath.empty())
61 StringRef Dir = File->getDirectory(), Filename = File->getFilename();
63 // Clang emits directory and relative filename info into the IR, but CodeView
64 // operates on full paths. We could change Clang to emit full paths too, but
65 // that would increase the IR size and probably not needed for other users.
66 // For now, just concatenate and canonicalize the path here.
67 if (Filename.find(':') == 1)
70 Filepath = (Dir + "\\" + Filename).str();
72 // Canonicalize the path. We have to do it textually because we may no longer
73 // have access the file in the filesystem.
74 // First, replace all slashes with backslashes.
75 std::replace(Filepath.begin(), Filepath.end(), '/', '\\');
77 // Remove all "\.\" with "\".
79 while ((Cursor = Filepath.find("\\.\\", Cursor)) != std::string::npos)
80 Filepath.erase(Cursor, 2);
82 // Replace all "\XXX\..\" with "\". Don't try too hard though as the original
83 // path should be well-formatted, e.g. start with a drive letter, etc.
85 while ((Cursor = Filepath.find("\\..\\", Cursor)) != std::string::npos) {
86 // Something's wrong if the path starts with "\..\", abort.
90 size_t PrevSlash = Filepath.rfind('\\', Cursor - 1);
91 if (PrevSlash == std::string::npos)
92 // Something's wrong, abort.
95 Filepath.erase(PrevSlash, Cursor + 3 - PrevSlash);
96 // The next ".." might be following the one we've just erased.
100 // Remove all duplicate backslashes.
102 while ((Cursor = Filepath.find("\\\\", Cursor)) != std::string::npos)
103 Filepath.erase(Cursor, 1);
108 unsigned CodeViewDebug::maybeRecordFile(const DIFile *F) {
109 unsigned NextId = FileIdMap.size() + 1;
110 auto Insertion = FileIdMap.insert(std::make_pair(F, NextId));
111 if (Insertion.second) {
112 // We have to compute the full filepath and emit a .cv_file directive.
113 StringRef FullPath = getFullFilepath(F);
114 bool Success = OS.EmitCVFileDirective(NextId, FullPath);
116 assert(Success && ".cv_file directive failed");
118 return Insertion.first->second;
121 CodeViewDebug::InlineSite &
122 CodeViewDebug::getInlineSite(const DILocation *InlinedAt,
123 const DISubprogram *Inlinee) {
124 auto SiteInsertion = CurFn->InlineSites.insert({InlinedAt, InlineSite()});
125 InlineSite *Site = &SiteInsertion.first->second;
126 if (SiteInsertion.second) {
127 unsigned ParentFuncId = CurFn->FuncId;
128 if (const DILocation *OuterIA = InlinedAt->getInlinedAt())
130 getInlineSite(OuterIA, InlinedAt->getScope()->getSubprogram())
133 Site->SiteFuncId = NextFuncId++;
134 OS.EmitCVInlineSiteIdDirective(
135 Site->SiteFuncId, ParentFuncId, maybeRecordFile(InlinedAt->getFile()),
136 InlinedAt->getLine(), InlinedAt->getColumn(), SMLoc());
137 Site->Inlinee = Inlinee;
138 InlinedSubprograms.insert(Inlinee);
139 getFuncIdForSubprogram(Inlinee);
144 static StringRef getPrettyScopeName(const DIScope *Scope) {
145 StringRef ScopeName = Scope->getName();
146 if (!ScopeName.empty())
149 switch (Scope->getTag()) {
150 case dwarf::DW_TAG_enumeration_type:
151 case dwarf::DW_TAG_class_type:
152 case dwarf::DW_TAG_structure_type:
153 case dwarf::DW_TAG_union_type:
154 return "<unnamed-tag>";
155 case dwarf::DW_TAG_namespace:
156 return "`anonymous namespace'";
162 static const DISubprogram *getQualifiedNameComponents(
163 const DIScope *Scope, SmallVectorImpl<StringRef> &QualifiedNameComponents) {
164 const DISubprogram *ClosestSubprogram = nullptr;
165 while (Scope != nullptr) {
166 if (ClosestSubprogram == nullptr)
167 ClosestSubprogram = dyn_cast<DISubprogram>(Scope);
168 StringRef ScopeName = getPrettyScopeName(Scope);
169 if (!ScopeName.empty())
170 QualifiedNameComponents.push_back(ScopeName);
171 Scope = Scope->getScope().resolve();
173 return ClosestSubprogram;
176 static std::string getQualifiedName(ArrayRef<StringRef> QualifiedNameComponents,
177 StringRef TypeName) {
178 std::string FullyQualifiedName;
179 for (StringRef QualifiedNameComponent : reverse(QualifiedNameComponents)) {
180 FullyQualifiedName.append(QualifiedNameComponent);
181 FullyQualifiedName.append("::");
183 FullyQualifiedName.append(TypeName);
184 return FullyQualifiedName;
187 static std::string getFullyQualifiedName(const DIScope *Scope, StringRef Name) {
188 SmallVector<StringRef, 5> QualifiedNameComponents;
189 getQualifiedNameComponents(Scope, QualifiedNameComponents);
190 return getQualifiedName(QualifiedNameComponents, Name);
193 struct CodeViewDebug::TypeLoweringScope {
194 TypeLoweringScope(CodeViewDebug &CVD) : CVD(CVD) { ++CVD.TypeEmissionLevel; }
195 ~TypeLoweringScope() {
196 // Don't decrement TypeEmissionLevel until after emitting deferred types, so
197 // inner TypeLoweringScopes don't attempt to emit deferred types.
198 if (CVD.TypeEmissionLevel == 1)
199 CVD.emitDeferredCompleteTypes();
200 --CVD.TypeEmissionLevel;
205 static std::string getFullyQualifiedName(const DIScope *Ty) {
206 const DIScope *Scope = Ty->getScope().resolve();
207 return getFullyQualifiedName(Scope, getPrettyScopeName(Ty));
210 TypeIndex CodeViewDebug::getScopeIndex(const DIScope *Scope) {
211 // No scope means global scope and that uses the zero index.
212 if (!Scope || isa<DIFile>(Scope))
215 assert(!isa<DIType>(Scope) && "shouldn't make a namespace scope for a type");
217 // Check if we've already translated this scope.
218 auto I = TypeIndices.find({Scope, nullptr});
219 if (I != TypeIndices.end())
222 // Build the fully qualified name of the scope.
223 std::string ScopeName = getFullyQualifiedName(Scope);
224 StringIdRecord SID(TypeIndex(), ScopeName);
225 auto TI = TypeTable.writeKnownType(SID);
226 return recordTypeIndexForDINode(Scope, TI);
229 TypeIndex CodeViewDebug::getFuncIdForSubprogram(const DISubprogram *SP) {
232 // Check if we've already translated this subprogram.
233 auto I = TypeIndices.find({SP, nullptr});
234 if (I != TypeIndices.end())
237 // The display name includes function template arguments. Drop them to match
239 StringRef DisplayName = SP->getDisplayName().split('<').first;
241 const DIScope *Scope = SP->getScope().resolve();
243 if (const auto *Class = dyn_cast_or_null<DICompositeType>(Scope)) {
244 // If the scope is a DICompositeType, then this must be a method. Member
245 // function types take some special handling, and require access to the
247 TypeIndex ClassType = getTypeIndex(Class);
248 MemberFuncIdRecord MFuncId(ClassType, getMemberFunctionType(SP, Class),
250 TI = TypeTable.writeKnownType(MFuncId);
252 // Otherwise, this must be a free function.
253 TypeIndex ParentScope = getScopeIndex(Scope);
254 FuncIdRecord FuncId(ParentScope, getTypeIndex(SP->getType()), DisplayName);
255 TI = TypeTable.writeKnownType(FuncId);
258 return recordTypeIndexForDINode(SP, TI);
261 TypeIndex CodeViewDebug::getMemberFunctionType(const DISubprogram *SP,
262 const DICompositeType *Class) {
263 // Always use the method declaration as the key for the function type. The
264 // method declaration contains the this adjustment.
265 if (SP->getDeclaration())
266 SP = SP->getDeclaration();
267 assert(!SP->getDeclaration() && "should use declaration as key");
269 // Key the MemberFunctionRecord into the map as {SP, Class}. It won't collide
270 // with the MemberFuncIdRecord, which is keyed in as {SP, nullptr}.
271 auto I = TypeIndices.find({SP, Class});
272 if (I != TypeIndices.end())
275 // Make sure complete type info for the class is emitted *after* the member
276 // function type, as the complete class type is likely to reference this
277 // member function type.
278 TypeLoweringScope S(*this);
280 lowerTypeMemberFunction(SP->getType(), Class, SP->getThisAdjustment());
281 return recordTypeIndexForDINode(SP, TI, Class);
284 TypeIndex CodeViewDebug::recordTypeIndexForDINode(const DINode *Node,
286 const DIType *ClassTy) {
287 auto InsertResult = TypeIndices.insert({{Node, ClassTy}, TI});
289 assert(InsertResult.second && "DINode was already assigned a type index");
293 unsigned CodeViewDebug::getPointerSizeInBytes() {
294 return MMI->getModule()->getDataLayout().getPointerSizeInBits() / 8;
297 void CodeViewDebug::recordLocalVariable(LocalVariable &&Var,
298 const DILocation *InlinedAt) {
300 // This variable was inlined. Associate it with the InlineSite.
301 const DISubprogram *Inlinee = Var.DIVar->getScope()->getSubprogram();
302 InlineSite &Site = getInlineSite(InlinedAt, Inlinee);
303 Site.InlinedLocals.emplace_back(Var);
305 // This variable goes in the main ProcSym.
306 CurFn->Locals.emplace_back(Var);
310 static void addLocIfNotPresent(SmallVectorImpl<const DILocation *> &Locs,
311 const DILocation *Loc) {
312 auto B = Locs.begin(), E = Locs.end();
313 if (std::find(B, E, Loc) == E)
317 void CodeViewDebug::maybeRecordLocation(const DebugLoc &DL,
318 const MachineFunction *MF) {
319 // Skip this instruction if it has the same location as the previous one.
320 if (DL == CurFn->LastLoc)
323 const DIScope *Scope = DL.get()->getScope();
327 // Skip this line if it is longer than the maximum we can record.
328 LineInfo LI(DL.getLine(), DL.getLine(), /*IsStatement=*/true);
329 if (LI.getStartLine() != DL.getLine() || LI.isAlwaysStepInto() ||
330 LI.isNeverStepInto())
333 ColumnInfo CI(DL.getCol(), /*EndColumn=*/0);
334 if (CI.getStartColumn() != DL.getCol())
337 if (!CurFn->HaveLineInfo)
338 CurFn->HaveLineInfo = true;
340 if (CurFn->LastLoc.get() && CurFn->LastLoc->getFile() == DL->getFile())
341 FileId = CurFn->LastFileId;
343 FileId = CurFn->LastFileId = maybeRecordFile(DL->getFile());
346 unsigned FuncId = CurFn->FuncId;
347 if (const DILocation *SiteLoc = DL->getInlinedAt()) {
348 const DILocation *Loc = DL.get();
350 // If this location was actually inlined from somewhere else, give it the ID
351 // of the inline call site.
353 getInlineSite(SiteLoc, Loc->getScope()->getSubprogram()).SiteFuncId;
355 // Ensure we have links in the tree of inline call sites.
356 bool FirstLoc = true;
357 while ((SiteLoc = Loc->getInlinedAt())) {
359 getInlineSite(SiteLoc, Loc->getScope()->getSubprogram());
361 addLocIfNotPresent(Site.ChildSites, Loc);
365 addLocIfNotPresent(CurFn->ChildSites, Loc);
368 OS.EmitCVLocDirective(FuncId, FileId, DL.getLine(), DL.getCol(),
369 /*PrologueEnd=*/false, /*IsStmt=*/false,
370 DL->getFilename(), SMLoc());
373 void CodeViewDebug::emitCodeViewMagicVersion() {
374 OS.EmitValueToAlignment(4);
375 OS.AddComment("Debug section magic");
376 OS.EmitIntValue(COFF::DEBUG_SECTION_MAGIC, 4);
379 void CodeViewDebug::endModule() {
380 if (!Asm || !MMI->hasDebugInfo())
383 assert(Asm != nullptr);
385 // The COFF .debug$S section consists of several subsections, each starting
386 // with a 4-byte control code (e.g. 0xF1, 0xF2, etc) and then a 4-byte length
387 // of the payload followed by the payload itself. The subsections are 4-byte
390 // Use the generic .debug$S section, and make a subsection for all the inlined
392 switchToDebugSectionForSymbol(nullptr);
394 MCSymbol *CompilerInfo = beginCVSubsection(ModuleSubstreamKind::Symbols);
395 emitCompilerInformation();
396 endCVSubsection(CompilerInfo);
398 emitInlineeLinesSubsection();
400 // Emit per-function debug information.
401 for (auto &P : FnDebugInfo)
402 if (!P.first->isDeclarationForLinker())
403 emitDebugInfoForFunction(P.first, P.second);
405 // Emit global variable debug information.
406 setCurrentSubprogram(nullptr);
407 emitDebugInfoForGlobals();
409 // Emit retained types.
410 emitDebugInfoForRetainedTypes();
412 // Switch back to the generic .debug$S section after potentially processing
413 // comdat symbol sections.
414 switchToDebugSectionForSymbol(nullptr);
416 // Emit UDT records for any types used by global variables.
417 if (!GlobalUDTs.empty()) {
418 MCSymbol *SymbolsEnd = beginCVSubsection(ModuleSubstreamKind::Symbols);
419 emitDebugInfoForUDTs(GlobalUDTs);
420 endCVSubsection(SymbolsEnd);
423 // This subsection holds a file index to offset in string table table.
424 OS.AddComment("File index to string table offset subsection");
425 OS.EmitCVFileChecksumsDirective();
427 // This subsection holds the string table.
428 OS.AddComment("String table");
429 OS.EmitCVStringTableDirective();
431 // Emit type information last, so that any types we translate while emitting
432 // function info are included.
433 emitTypeInformation();
438 static void emitNullTerminatedSymbolName(MCStreamer &OS, StringRef S) {
439 // The maximum CV record length is 0xFF00. Most of the strings we emit appear
440 // after a fixed length portion of the record. The fixed length portion should
441 // always be less than 0xF00 (3840) bytes, so truncate the string so that the
442 // overall record size is less than the maximum allowed.
443 unsigned MaxFixedRecordLength = 0xF00;
444 SmallString<32> NullTerminatedString(
445 S.take_front(MaxRecordLength - MaxFixedRecordLength - 1));
446 NullTerminatedString.push_back('\0');
447 OS.EmitBytes(NullTerminatedString);
450 void CodeViewDebug::emitTypeInformation() {
451 // Do nothing if we have no debug info or if no non-trivial types were emitted
452 // to TypeTable during codegen.
453 NamedMDNode *CU_Nodes = MMI->getModule()->getNamedMetadata("llvm.dbg.cu");
456 if (TypeTable.empty())
459 // Start the .debug$T section with 0x4.
460 OS.SwitchSection(Asm->getObjFileLowering().getCOFFDebugTypesSection());
461 emitCodeViewMagicVersion();
463 SmallString<8> CommentPrefix;
464 if (OS.isVerboseAsm()) {
465 CommentPrefix += '\t';
466 CommentPrefix += Asm->MAI->getCommentString();
467 CommentPrefix += ' ';
470 CVTypeDumper CVTD(nullptr, /*PrintRecordBytes=*/false);
471 TypeTable.ForEachRecord([&](TypeIndex Index, ArrayRef<uint8_t> Record) {
472 if (OS.isVerboseAsm()) {
473 // Emit a block comment describing the type record for readability.
474 SmallString<512> CommentBlock;
475 raw_svector_ostream CommentOS(CommentBlock);
476 ScopedPrinter SP(CommentOS);
477 SP.setPrefix(CommentPrefix);
478 CVTD.setPrinter(&SP);
479 Error E = CVTD.dump(Record);
481 logAllUnhandledErrors(std::move(E), errs(), "error: ");
482 llvm_unreachable("produced malformed type record");
484 // emitRawComment will insert its own tab and comment string before
485 // the first line, so strip off our first one. It also prints its own
488 CommentOS.str().drop_front(CommentPrefix.size() - 1).rtrim());
491 // Assert that the type data is valid even if we aren't dumping
492 // comments. The MSVC linker doesn't do much type record validation,
493 // so the first link of an invalid type record can succeed while
494 // subsequent links will fail with LNK1285.
495 ByteStream Stream(Record);
497 StreamReader Reader(Stream);
498 Error E = Reader.readArray(Types, Reader.getLength());
500 TypeVisitorCallbacks C;
501 E = CVTypeVisitor(C).visitTypeStream(Types);
504 logAllUnhandledErrors(std::move(E), errs(), "error: ");
505 llvm_unreachable("produced malformed type record");
509 StringRef S(reinterpret_cast<const char *>(Record.data()), Record.size());
510 OS.EmitBinaryData(S);
516 static SourceLanguage MapDWLangToCVLang(unsigned DWLang) {
518 case dwarf::DW_LANG_C:
519 case dwarf::DW_LANG_C89:
520 case dwarf::DW_LANG_C99:
521 case dwarf::DW_LANG_C11:
522 case dwarf::DW_LANG_ObjC:
523 return SourceLanguage::C;
524 case dwarf::DW_LANG_C_plus_plus:
525 case dwarf::DW_LANG_C_plus_plus_03:
526 case dwarf::DW_LANG_C_plus_plus_11:
527 case dwarf::DW_LANG_C_plus_plus_14:
528 return SourceLanguage::Cpp;
529 case dwarf::DW_LANG_Fortran77:
530 case dwarf::DW_LANG_Fortran90:
531 case dwarf::DW_LANG_Fortran03:
532 case dwarf::DW_LANG_Fortran08:
533 return SourceLanguage::Fortran;
534 case dwarf::DW_LANG_Pascal83:
535 return SourceLanguage::Pascal;
536 case dwarf::DW_LANG_Cobol74:
537 case dwarf::DW_LANG_Cobol85:
538 return SourceLanguage::Cobol;
539 case dwarf::DW_LANG_Java:
540 return SourceLanguage::Java;
542 // There's no CodeView representation for this language, and CV doesn't
543 // have an "unknown" option for the language field, so we'll use MASM,
544 // as it's very low level.
545 return SourceLanguage::Masm;
553 // Takes a StringRef like "clang 4.0.0.0 (other nonsense 123)" and parses out
554 // the version number.
555 static Version parseVersion(StringRef Name) {
558 for (const char C : Name) {
561 V.Part[N] += C - '0';
562 } else if (C == '.') {
572 static CPUType mapArchToCVCPUType(Triple::ArchType Type) {
574 case Triple::ArchType::x86:
575 return CPUType::Pentium3;
576 case Triple::ArchType::x86_64:
578 case Triple::ArchType::thumb:
579 return CPUType::Thumb;
581 report_fatal_error("target architecture doesn't map to a CodeView "
586 } // anonymous namespace
588 void CodeViewDebug::emitCompilerInformation() {
589 MCContext &Context = MMI->getContext();
590 MCSymbol *CompilerBegin = Context.createTempSymbol(),
591 *CompilerEnd = Context.createTempSymbol();
592 OS.AddComment("Record length");
593 OS.emitAbsoluteSymbolDiff(CompilerEnd, CompilerBegin, 2);
594 OS.EmitLabel(CompilerBegin);
595 OS.AddComment("Record kind: S_COMPILE3");
596 OS.EmitIntValue(SymbolKind::S_COMPILE3, 2);
599 NamedMDNode *CUs = MMI->getModule()->getNamedMetadata("llvm.dbg.cu");
600 const MDNode *Node = *CUs->operands().begin();
601 const auto *CU = cast<DICompileUnit>(Node);
603 // The low byte of the flags indicates the source language.
604 Flags = MapDWLangToCVLang(CU->getSourceLanguage());
605 // TODO: Figure out which other flags need to be set.
607 OS.AddComment("Flags and language");
608 OS.EmitIntValue(Flags, 4);
610 OS.AddComment("CPUType");
612 mapArchToCVCPUType(Triple(MMI->getModule()->getTargetTriple()).getArch());
613 OS.EmitIntValue(static_cast<uint64_t>(CPU), 2);
615 StringRef CompilerVersion = CU->getProducer();
616 Version FrontVer = parseVersion(CompilerVersion);
617 OS.AddComment("Frontend version");
618 for (int N = 0; N < 4; ++N)
619 OS.EmitIntValue(FrontVer.Part[N], 2);
621 // Some Microsoft tools, like Binscope, expect a backend version number of at
622 // least 8.something, so we'll coerce the LLVM version into a form that
623 // guarantees it'll be big enough without really lying about the version.
624 int Major = 1000 * LLVM_VERSION_MAJOR +
625 10 * LLVM_VERSION_MINOR +
627 // Clamp it for builds that use unusually large version numbers.
628 Major = std::min<int>(Major, std::numeric_limits<uint16_t>::max());
629 Version BackVer = {{ Major, 0, 0, 0 }};
630 OS.AddComment("Backend version");
631 for (int N = 0; N < 4; ++N)
632 OS.EmitIntValue(BackVer.Part[N], 2);
634 OS.AddComment("Null-terminated compiler version string");
635 emitNullTerminatedSymbolName(OS, CompilerVersion);
637 OS.EmitLabel(CompilerEnd);
640 void CodeViewDebug::emitInlineeLinesSubsection() {
641 if (InlinedSubprograms.empty())
644 OS.AddComment("Inlinee lines subsection");
645 MCSymbol *InlineEnd = beginCVSubsection(ModuleSubstreamKind::InlineeLines);
647 // We don't provide any extra file info.
648 // FIXME: Find out if debuggers use this info.
649 OS.AddComment("Inlinee lines signature");
650 OS.EmitIntValue(unsigned(InlineeLinesSignature::Normal), 4);
652 for (const DISubprogram *SP : InlinedSubprograms) {
653 assert(TypeIndices.count({SP, nullptr}));
654 TypeIndex InlineeIdx = TypeIndices[{SP, nullptr}];
657 unsigned FileId = maybeRecordFile(SP->getFile());
658 OS.AddComment("Inlined function " + SP->getDisplayName() + " starts at " +
659 SP->getFilename() + Twine(':') + Twine(SP->getLine()));
661 // The filechecksum table uses 8 byte entries for now, and file ids start at
663 unsigned FileOffset = (FileId - 1) * 8;
664 OS.AddComment("Type index of inlined function");
665 OS.EmitIntValue(InlineeIdx.getIndex(), 4);
666 OS.AddComment("Offset into filechecksum table");
667 OS.EmitIntValue(FileOffset, 4);
668 OS.AddComment("Starting line number");
669 OS.EmitIntValue(SP->getLine(), 4);
672 endCVSubsection(InlineEnd);
675 void CodeViewDebug::emitInlinedCallSite(const FunctionInfo &FI,
676 const DILocation *InlinedAt,
677 const InlineSite &Site) {
678 MCSymbol *InlineBegin = MMI->getContext().createTempSymbol(),
679 *InlineEnd = MMI->getContext().createTempSymbol();
681 assert(TypeIndices.count({Site.Inlinee, nullptr}));
682 TypeIndex InlineeIdx = TypeIndices[{Site.Inlinee, nullptr}];
685 OS.AddComment("Record length");
686 OS.emitAbsoluteSymbolDiff(InlineEnd, InlineBegin, 2); // RecordLength
687 OS.EmitLabel(InlineBegin);
688 OS.AddComment("Record kind: S_INLINESITE");
689 OS.EmitIntValue(SymbolKind::S_INLINESITE, 2); // RecordKind
691 OS.AddComment("PtrParent");
692 OS.EmitIntValue(0, 4);
693 OS.AddComment("PtrEnd");
694 OS.EmitIntValue(0, 4);
695 OS.AddComment("Inlinee type index");
696 OS.EmitIntValue(InlineeIdx.getIndex(), 4);
698 unsigned FileId = maybeRecordFile(Site.Inlinee->getFile());
699 unsigned StartLineNum = Site.Inlinee->getLine();
701 OS.EmitCVInlineLinetableDirective(Site.SiteFuncId, FileId, StartLineNum,
704 OS.EmitLabel(InlineEnd);
706 emitLocalVariableList(Site.InlinedLocals);
708 // Recurse on child inlined call sites before closing the scope.
709 for (const DILocation *ChildSite : Site.ChildSites) {
710 auto I = FI.InlineSites.find(ChildSite);
711 assert(I != FI.InlineSites.end() &&
712 "child site not in function inline site map");
713 emitInlinedCallSite(FI, ChildSite, I->second);
717 OS.AddComment("Record length");
718 OS.EmitIntValue(2, 2); // RecordLength
719 OS.AddComment("Record kind: S_INLINESITE_END");
720 OS.EmitIntValue(SymbolKind::S_INLINESITE_END, 2); // RecordKind
723 void CodeViewDebug::switchToDebugSectionForSymbol(const MCSymbol *GVSym) {
724 // If we have a symbol, it may be in a section that is COMDAT. If so, find the
725 // comdat key. A section may be comdat because of -ffunction-sections or
726 // because it is comdat in the IR.
727 MCSectionCOFF *GVSec =
728 GVSym ? dyn_cast<MCSectionCOFF>(&GVSym->getSection()) : nullptr;
729 const MCSymbol *KeySym = GVSec ? GVSec->getCOMDATSymbol() : nullptr;
731 MCSectionCOFF *DebugSec = cast<MCSectionCOFF>(
732 Asm->getObjFileLowering().getCOFFDebugSymbolsSection());
733 DebugSec = OS.getContext().getAssociativeCOFFSection(DebugSec, KeySym);
735 OS.SwitchSection(DebugSec);
737 // Emit the magic version number if this is the first time we've switched to
739 if (ComdatDebugSections.insert(DebugSec).second)
740 emitCodeViewMagicVersion();
743 void CodeViewDebug::emitDebugInfoForFunction(const Function *GV,
745 // For each function there is a separate subsection
746 // which holds the PC to file:line table.
747 const MCSymbol *Fn = Asm->getSymbol(GV);
750 // Switch to the to a comdat section, if appropriate.
751 switchToDebugSectionForSymbol(Fn);
753 std::string FuncName;
754 auto *SP = GV->getSubprogram();
756 setCurrentSubprogram(SP);
758 // If we have a display name, build the fully qualified name by walking the
760 if (!SP->getDisplayName().empty())
762 getFullyQualifiedName(SP->getScope().resolve(), SP->getDisplayName());
764 // If our DISubprogram name is empty, use the mangled name.
765 if (FuncName.empty())
766 FuncName = GlobalValue::getRealLinkageName(GV->getName());
768 // Emit a symbol subsection, required by VS2012+ to find function boundaries.
769 OS.AddComment("Symbol subsection for " + Twine(FuncName));
770 MCSymbol *SymbolsEnd = beginCVSubsection(ModuleSubstreamKind::Symbols);
772 MCSymbol *ProcRecordBegin = MMI->getContext().createTempSymbol(),
773 *ProcRecordEnd = MMI->getContext().createTempSymbol();
774 OS.AddComment("Record length");
775 OS.emitAbsoluteSymbolDiff(ProcRecordEnd, ProcRecordBegin, 2);
776 OS.EmitLabel(ProcRecordBegin);
778 if (GV->hasLocalLinkage()) {
779 OS.AddComment("Record kind: S_LPROC32_ID");
780 OS.EmitIntValue(unsigned(SymbolKind::S_LPROC32_ID), 2);
782 OS.AddComment("Record kind: S_GPROC32_ID");
783 OS.EmitIntValue(unsigned(SymbolKind::S_GPROC32_ID), 2);
786 // These fields are filled in by tools like CVPACK which run after the fact.
787 OS.AddComment("PtrParent");
788 OS.EmitIntValue(0, 4);
789 OS.AddComment("PtrEnd");
790 OS.EmitIntValue(0, 4);
791 OS.AddComment("PtrNext");
792 OS.EmitIntValue(0, 4);
793 // This is the important bit that tells the debugger where the function
794 // code is located and what's its size:
795 OS.AddComment("Code size");
796 OS.emitAbsoluteSymbolDiff(FI.End, Fn, 4);
797 OS.AddComment("Offset after prologue");
798 OS.EmitIntValue(0, 4);
799 OS.AddComment("Offset before epilogue");
800 OS.EmitIntValue(0, 4);
801 OS.AddComment("Function type index");
802 OS.EmitIntValue(getFuncIdForSubprogram(GV->getSubprogram()).getIndex(), 4);
803 OS.AddComment("Function section relative address");
804 OS.EmitCOFFSecRel32(Fn, /*Offset=*/0);
805 OS.AddComment("Function section index");
806 OS.EmitCOFFSectionIndex(Fn);
807 OS.AddComment("Flags");
808 OS.EmitIntValue(0, 1);
809 // Emit the function display name as a null-terminated string.
810 OS.AddComment("Function name");
811 // Truncate the name so we won't overflow the record length field.
812 emitNullTerminatedSymbolName(OS, FuncName);
813 OS.EmitLabel(ProcRecordEnd);
815 emitLocalVariableList(FI.Locals);
817 // Emit inlined call site information. Only emit functions inlined directly
818 // into the parent function. We'll emit the other sites recursively as part
819 // of their parent inline site.
820 for (const DILocation *InlinedAt : FI.ChildSites) {
821 auto I = FI.InlineSites.find(InlinedAt);
822 assert(I != FI.InlineSites.end() &&
823 "child site not in function inline site map");
824 emitInlinedCallSite(FI, InlinedAt, I->second);
828 emitDebugInfoForUDTs(LocalUDTs);
830 // We're done with this function.
831 OS.AddComment("Record length");
832 OS.EmitIntValue(0x0002, 2);
833 OS.AddComment("Record kind: S_PROC_ID_END");
834 OS.EmitIntValue(unsigned(SymbolKind::S_PROC_ID_END), 2);
836 endCVSubsection(SymbolsEnd);
838 // We have an assembler directive that takes care of the whole line table.
839 OS.EmitCVLinetableDirective(FI.FuncId, Fn, FI.End);
842 CodeViewDebug::LocalVarDefRange
843 CodeViewDebug::createDefRangeMem(uint16_t CVRegister, int Offset) {
846 DR.DataOffset = Offset;
847 assert(DR.DataOffset == Offset && "truncation");
850 DR.CVRegister = CVRegister;
854 CodeViewDebug::LocalVarDefRange
855 CodeViewDebug::createDefRangeGeneral(uint16_t CVRegister, bool InMemory,
856 int Offset, bool IsSubfield,
857 uint16_t StructOffset) {
859 DR.InMemory = InMemory;
860 DR.DataOffset = Offset;
861 DR.IsSubfield = IsSubfield;
862 DR.StructOffset = StructOffset;
863 DR.CVRegister = CVRegister;
867 void CodeViewDebug::collectVariableInfoFromMFTable(
868 DenseSet<InlinedVariable> &Processed) {
869 const MachineFunction &MF = *Asm->MF;
870 const TargetSubtargetInfo &TSI = MF.getSubtarget();
871 const TargetFrameLowering *TFI = TSI.getFrameLowering();
872 const TargetRegisterInfo *TRI = TSI.getRegisterInfo();
874 for (const MachineFunction::VariableDbgInfo &VI : MF.getVariableDbgInfo()) {
877 assert(VI.Var->isValidLocationForIntrinsic(VI.Loc) &&
878 "Expected inlined-at fields to agree");
880 Processed.insert(InlinedVariable(VI.Var, VI.Loc->getInlinedAt()));
881 LexicalScope *Scope = LScopes.findLexicalScope(VI.Loc);
883 // If variable scope is not found then skip this variable.
887 // Get the frame register used and the offset.
888 unsigned FrameReg = 0;
889 int FrameOffset = TFI->getFrameIndexReference(*Asm->MF, VI.Slot, FrameReg);
890 uint16_t CVReg = TRI->getCodeViewRegNum(FrameReg);
892 // Calculate the label ranges.
893 LocalVarDefRange DefRange = createDefRangeMem(CVReg, FrameOffset);
894 for (const InsnRange &Range : Scope->getRanges()) {
895 const MCSymbol *Begin = getLabelBeforeInsn(Range.first);
896 const MCSymbol *End = getLabelAfterInsn(Range.second);
897 End = End ? End : Asm->getFunctionEnd();
898 DefRange.Ranges.emplace_back(Begin, End);
903 Var.DefRanges.emplace_back(std::move(DefRange));
904 recordLocalVariable(std::move(Var), VI.Loc->getInlinedAt());
908 void CodeViewDebug::collectVariableInfo(const DISubprogram *SP) {
909 DenseSet<InlinedVariable> Processed;
910 // Grab the variable info that was squirreled away in the MMI side-table.
911 collectVariableInfoFromMFTable(Processed);
913 const TargetRegisterInfo *TRI = Asm->MF->getSubtarget().getRegisterInfo();
915 for (const auto &I : DbgValues) {
916 InlinedVariable IV = I.first;
917 if (Processed.count(IV))
919 const DILocalVariable *DIVar = IV.first;
920 const DILocation *InlinedAt = IV.second;
922 // Instruction ranges, specifying where IV is accessible.
923 const auto &Ranges = I.second;
925 LexicalScope *Scope = nullptr;
927 Scope = LScopes.findInlinedScope(DIVar->getScope(), InlinedAt);
929 Scope = LScopes.findLexicalScope(DIVar->getScope());
930 // If variable scope is not found then skip this variable.
937 // Calculate the definition ranges.
938 for (auto I = Ranges.begin(), E = Ranges.end(); I != E; ++I) {
939 const InsnRange &Range = *I;
940 const MachineInstr *DVInst = Range.first;
941 assert(DVInst->isDebugValue() && "Invalid History entry");
942 const DIExpression *DIExpr = DVInst->getDebugExpression();
943 bool IsSubfield = false;
944 unsigned StructOffset = 0;
947 auto Fragment = DIExpr->getFragmentInfo();
948 if (DIExpr && Fragment) {
950 StructOffset = Fragment->OffsetInBits / 8;
951 } else if (DIExpr && DIExpr->getNumElements() > 0) {
952 continue; // Ignore unrecognized exprs.
955 // Bail if operand 0 is not a valid register. This means the variable is a
956 // simple constant, or is described by a complex expression.
957 // FIXME: Find a way to represent constant variables, since they are
958 // relatively common.
960 DVInst->getOperand(0).isReg() ? DVInst->getOperand(0).getReg() : 0;
964 // Handle the two cases we can handle: indirect in memory and in register.
965 unsigned CVReg = TRI->getCodeViewRegNum(Reg);
966 bool InMemory = DVInst->getOperand(1).isImm();
967 int Offset = InMemory ? DVInst->getOperand(1).getImm() : 0;
970 DR.CVRegister = CVReg;
971 DR.InMemory = InMemory;
972 DR.DataOffset = Offset;
973 DR.IsSubfield = IsSubfield;
974 DR.StructOffset = StructOffset;
976 if (Var.DefRanges.empty() ||
977 Var.DefRanges.back().isDifferentLocation(DR)) {
978 Var.DefRanges.emplace_back(std::move(DR));
982 // Compute the label range.
983 const MCSymbol *Begin = getLabelBeforeInsn(Range.first);
984 const MCSymbol *End = getLabelAfterInsn(Range.second);
986 // This range is valid until the next overlapping bitpiece. In the
987 // common case, ranges will not be bitpieces, so they will overlap.
988 auto J = std::next(I);
990 !fragmentsOverlap(DIExpr, J->first->getDebugExpression()))
993 End = getLabelBeforeInsn(J->first);
995 End = Asm->getFunctionEnd();
998 // If the last range end is our begin, just extend the last range.
999 // Otherwise make a new range.
1000 SmallVectorImpl<std::pair<const MCSymbol *, const MCSymbol *>> &Ranges =
1001 Var.DefRanges.back().Ranges;
1002 if (!Ranges.empty() && Ranges.back().second == Begin)
1003 Ranges.back().second = End;
1005 Ranges.emplace_back(Begin, End);
1007 // FIXME: Do more range combining.
1010 recordLocalVariable(std::move(Var), InlinedAt);
1014 void CodeViewDebug::beginFunction(const MachineFunction *MF) {
1015 assert(!CurFn && "Can't process two functions at once!");
1017 if (!Asm || !MMI->hasDebugInfo() || !MF->getFunction()->getSubprogram())
1020 DebugHandlerBase::beginFunction(MF);
1022 const Function *GV = MF->getFunction();
1023 assert(FnDebugInfo.count(GV) == false);
1024 CurFn = &FnDebugInfo[GV];
1025 CurFn->FuncId = NextFuncId++;
1026 CurFn->Begin = Asm->getFunctionBegin();
1028 OS.EmitCVFuncIdDirective(CurFn->FuncId);
1030 // Find the end of the function prolog. First known non-DBG_VALUE and
1031 // non-frame setup location marks the beginning of the function body.
1032 // FIXME: is there a simpler a way to do this? Can we just search
1033 // for the first instruction of the function, not the last of the prolog?
1034 DebugLoc PrologEndLoc;
1035 bool EmptyPrologue = true;
1036 for (const auto &MBB : *MF) {
1037 for (const auto &MI : MBB) {
1038 if (!MI.isDebugValue() && !MI.getFlag(MachineInstr::FrameSetup) &&
1040 PrologEndLoc = MI.getDebugLoc();
1042 } else if (!MI.isDebugValue()) {
1043 EmptyPrologue = false;
1048 // Record beginning of function if we have a non-empty prologue.
1049 if (PrologEndLoc && !EmptyPrologue) {
1050 DebugLoc FnStartDL = PrologEndLoc.getFnDebugLoc();
1051 maybeRecordLocation(FnStartDL, MF);
1055 void CodeViewDebug::addToUDTs(const DIType *Ty, TypeIndex TI) {
1056 // Don't record empty UDTs.
1057 if (Ty->getName().empty())
1060 SmallVector<StringRef, 5> QualifiedNameComponents;
1061 const DISubprogram *ClosestSubprogram = getQualifiedNameComponents(
1062 Ty->getScope().resolve(), QualifiedNameComponents);
1064 std::string FullyQualifiedName =
1065 getQualifiedName(QualifiedNameComponents, getPrettyScopeName(Ty));
1067 if (ClosestSubprogram == nullptr)
1068 GlobalUDTs.emplace_back(std::move(FullyQualifiedName), TI);
1069 else if (ClosestSubprogram == CurrentSubprogram)
1070 LocalUDTs.emplace_back(std::move(FullyQualifiedName), TI);
1072 // TODO: What if the ClosestSubprogram is neither null or the current
1073 // subprogram? Currently, the UDT just gets dropped on the floor.
1075 // The current behavior is not desirable. To get maximal fidelity, we would
1076 // need to perform all type translation before beginning emission of .debug$S
1077 // and then make LocalUDTs a member of FunctionInfo
1080 TypeIndex CodeViewDebug::lowerType(const DIType *Ty, const DIType *ClassTy) {
1081 // Generic dispatch for lowering an unknown type.
1082 switch (Ty->getTag()) {
1083 case dwarf::DW_TAG_array_type:
1084 return lowerTypeArray(cast<DICompositeType>(Ty));
1085 case dwarf::DW_TAG_typedef:
1086 return lowerTypeAlias(cast<DIDerivedType>(Ty));
1087 case dwarf::DW_TAG_base_type:
1088 return lowerTypeBasic(cast<DIBasicType>(Ty));
1089 case dwarf::DW_TAG_pointer_type:
1090 if (cast<DIDerivedType>(Ty)->getName() == "__vtbl_ptr_type")
1091 return lowerTypeVFTableShape(cast<DIDerivedType>(Ty));
1093 case dwarf::DW_TAG_reference_type:
1094 case dwarf::DW_TAG_rvalue_reference_type:
1095 return lowerTypePointer(cast<DIDerivedType>(Ty));
1096 case dwarf::DW_TAG_ptr_to_member_type:
1097 return lowerTypeMemberPointer(cast<DIDerivedType>(Ty));
1098 case dwarf::DW_TAG_const_type:
1099 case dwarf::DW_TAG_volatile_type:
1100 // TODO: add support for DW_TAG_atomic_type here
1101 return lowerTypeModifier(cast<DIDerivedType>(Ty));
1102 case dwarf::DW_TAG_subroutine_type:
1104 // The member function type of a member function pointer has no
1106 return lowerTypeMemberFunction(cast<DISubroutineType>(Ty), ClassTy,
1107 /*ThisAdjustment=*/0);
1109 return lowerTypeFunction(cast<DISubroutineType>(Ty));
1110 case dwarf::DW_TAG_enumeration_type:
1111 return lowerTypeEnum(cast<DICompositeType>(Ty));
1112 case dwarf::DW_TAG_class_type:
1113 case dwarf::DW_TAG_structure_type:
1114 return lowerTypeClass(cast<DICompositeType>(Ty));
1115 case dwarf::DW_TAG_union_type:
1116 return lowerTypeUnion(cast<DICompositeType>(Ty));
1118 // Use the null type index.
1123 TypeIndex CodeViewDebug::lowerTypeAlias(const DIDerivedType *Ty) {
1124 DITypeRef UnderlyingTypeRef = Ty->getBaseType();
1125 TypeIndex UnderlyingTypeIndex = getTypeIndex(UnderlyingTypeRef);
1126 StringRef TypeName = Ty->getName();
1128 addToUDTs(Ty, UnderlyingTypeIndex);
1130 if (UnderlyingTypeIndex == TypeIndex(SimpleTypeKind::Int32Long) &&
1131 TypeName == "HRESULT")
1132 return TypeIndex(SimpleTypeKind::HResult);
1133 if (UnderlyingTypeIndex == TypeIndex(SimpleTypeKind::UInt16Short) &&
1134 TypeName == "wchar_t")
1135 return TypeIndex(SimpleTypeKind::WideCharacter);
1137 return UnderlyingTypeIndex;
1140 TypeIndex CodeViewDebug::lowerTypeArray(const DICompositeType *Ty) {
1141 DITypeRef ElementTypeRef = Ty->getBaseType();
1142 TypeIndex ElementTypeIndex = getTypeIndex(ElementTypeRef);
1143 // IndexType is size_t, which depends on the bitness of the target.
1144 TypeIndex IndexType = Asm->MAI->getPointerSize() == 8
1145 ? TypeIndex(SimpleTypeKind::UInt64Quad)
1146 : TypeIndex(SimpleTypeKind::UInt32Long);
1148 uint64_t ElementSize = getBaseTypeSize(ElementTypeRef) / 8;
1151 // We want to assert that the element type multiplied by the array lengths
1152 // match the size of the overall array. However, if we don't have complete
1153 // type information for the base type, we can't make this assertion. This
1154 // happens if limited debug info is enabled in this case:
1155 // struct VTableOptzn { VTableOptzn(); virtual ~VTableOptzn(); };
1156 // VTableOptzn array[3];
1157 // The DICompositeType of VTableOptzn will have size zero, and the array will
1158 // have size 3 * sizeof(void*), and we should avoid asserting.
1160 // There is a related bug in the front-end where an array of a structure,
1161 // which was declared as incomplete structure first, ends up not getting a
1162 // size assigned to it. (PR28303)
1165 // struct A { int f; } a[3];
1166 bool PartiallyIncomplete = false;
1167 if (Ty->getSizeInBits() == 0 || ElementSize == 0) {
1168 PartiallyIncomplete = true;
1171 // Add subranges to array type.
1172 DINodeArray Elements = Ty->getElements();
1173 for (int i = Elements.size() - 1; i >= 0; --i) {
1174 const DINode *Element = Elements[i];
1175 assert(Element->getTag() == dwarf::DW_TAG_subrange_type);
1177 const DISubrange *Subrange = cast<DISubrange>(Element);
1178 assert(Subrange->getLowerBound() == 0 &&
1179 "codeview doesn't support subranges with lower bounds");
1180 int64_t Count = Subrange->getCount();
1182 // Variable Length Array (VLA) has Count equal to '-1'.
1183 // Replace with Count '1', assume it is the minimum VLA length.
1184 // FIXME: Make front-end support VLA subrange and emit LF_DIMVARLU.
1187 PartiallyIncomplete = true;
1190 // Update the element size and element type index for subsequent subranges.
1191 ElementSize *= Count;
1193 // If this is the outermost array, use the size from the array. It will be
1194 // more accurate if PartiallyIncomplete is true.
1195 uint64_t ArraySize =
1196 (i == 0 && ElementSize == 0) ? Ty->getSizeInBits() / 8 : ElementSize;
1198 StringRef Name = (i == 0) ? Ty->getName() : "";
1199 ArrayRecord AR(ElementTypeIndex, IndexType, ArraySize, Name);
1200 ElementTypeIndex = TypeTable.writeKnownType(AR);
1203 (void)PartiallyIncomplete;
1204 assert(PartiallyIncomplete || ElementSize == (Ty->getSizeInBits() / 8));
1206 return ElementTypeIndex;
1209 TypeIndex CodeViewDebug::lowerTypeBasic(const DIBasicType *Ty) {
1211 dwarf::TypeKind Kind;
1214 Kind = static_cast<dwarf::TypeKind>(Ty->getEncoding());
1215 ByteSize = Ty->getSizeInBits() / 8;
1217 SimpleTypeKind STK = SimpleTypeKind::None;
1219 case dwarf::DW_ATE_address:
1222 case dwarf::DW_ATE_boolean:
1224 case 1: STK = SimpleTypeKind::Boolean8; break;
1225 case 2: STK = SimpleTypeKind::Boolean16; break;
1226 case 4: STK = SimpleTypeKind::Boolean32; break;
1227 case 8: STK = SimpleTypeKind::Boolean64; break;
1228 case 16: STK = SimpleTypeKind::Boolean128; break;
1231 case dwarf::DW_ATE_complex_float:
1233 case 2: STK = SimpleTypeKind::Complex16; break;
1234 case 4: STK = SimpleTypeKind::Complex32; break;
1235 case 8: STK = SimpleTypeKind::Complex64; break;
1236 case 10: STK = SimpleTypeKind::Complex80; break;
1237 case 16: STK = SimpleTypeKind::Complex128; break;
1240 case dwarf::DW_ATE_float:
1242 case 2: STK = SimpleTypeKind::Float16; break;
1243 case 4: STK = SimpleTypeKind::Float32; break;
1244 case 6: STK = SimpleTypeKind::Float48; break;
1245 case 8: STK = SimpleTypeKind::Float64; break;
1246 case 10: STK = SimpleTypeKind::Float80; break;
1247 case 16: STK = SimpleTypeKind::Float128; break;
1250 case dwarf::DW_ATE_signed:
1252 case 1: STK = SimpleTypeKind::SignedCharacter; break;
1253 case 2: STK = SimpleTypeKind::Int16Short; break;
1254 case 4: STK = SimpleTypeKind::Int32; break;
1255 case 8: STK = SimpleTypeKind::Int64Quad; break;
1256 case 16: STK = SimpleTypeKind::Int128Oct; break;
1259 case dwarf::DW_ATE_unsigned:
1261 case 1: STK = SimpleTypeKind::UnsignedCharacter; break;
1262 case 2: STK = SimpleTypeKind::UInt16Short; break;
1263 case 4: STK = SimpleTypeKind::UInt32; break;
1264 case 8: STK = SimpleTypeKind::UInt64Quad; break;
1265 case 16: STK = SimpleTypeKind::UInt128Oct; break;
1268 case dwarf::DW_ATE_UTF:
1270 case 2: STK = SimpleTypeKind::Character16; break;
1271 case 4: STK = SimpleTypeKind::Character32; break;
1274 case dwarf::DW_ATE_signed_char:
1276 STK = SimpleTypeKind::SignedCharacter;
1278 case dwarf::DW_ATE_unsigned_char:
1280 STK = SimpleTypeKind::UnsignedCharacter;
1286 // Apply some fixups based on the source-level type name.
1287 if (STK == SimpleTypeKind::Int32 && Ty->getName() == "long int")
1288 STK = SimpleTypeKind::Int32Long;
1289 if (STK == SimpleTypeKind::UInt32 && Ty->getName() == "long unsigned int")
1290 STK = SimpleTypeKind::UInt32Long;
1291 if (STK == SimpleTypeKind::UInt16Short &&
1292 (Ty->getName() == "wchar_t" || Ty->getName() == "__wchar_t"))
1293 STK = SimpleTypeKind::WideCharacter;
1294 if ((STK == SimpleTypeKind::SignedCharacter ||
1295 STK == SimpleTypeKind::UnsignedCharacter) &&
1296 Ty->getName() == "char")
1297 STK = SimpleTypeKind::NarrowCharacter;
1299 return TypeIndex(STK);
1302 TypeIndex CodeViewDebug::lowerTypePointer(const DIDerivedType *Ty) {
1303 TypeIndex PointeeTI = getTypeIndex(Ty->getBaseType());
1305 // Pointers to simple types can use SimpleTypeMode, rather than having a
1306 // dedicated pointer type record.
1307 if (PointeeTI.isSimple() &&
1308 PointeeTI.getSimpleMode() == SimpleTypeMode::Direct &&
1309 Ty->getTag() == dwarf::DW_TAG_pointer_type) {
1310 SimpleTypeMode Mode = Ty->getSizeInBits() == 64
1311 ? SimpleTypeMode::NearPointer64
1312 : SimpleTypeMode::NearPointer32;
1313 return TypeIndex(PointeeTI.getSimpleKind(), Mode);
1317 Ty->getSizeInBits() == 64 ? PointerKind::Near64 : PointerKind::Near32;
1318 PointerMode PM = PointerMode::Pointer;
1319 switch (Ty->getTag()) {
1320 default: llvm_unreachable("not a pointer tag type");
1321 case dwarf::DW_TAG_pointer_type:
1322 PM = PointerMode::Pointer;
1324 case dwarf::DW_TAG_reference_type:
1325 PM = PointerMode::LValueReference;
1327 case dwarf::DW_TAG_rvalue_reference_type:
1328 PM = PointerMode::RValueReference;
1331 // FIXME: MSVC folds qualifiers into PointerOptions in the context of a method
1332 // 'this' pointer, but not normal contexts. Figure out what we're supposed to
1334 PointerOptions PO = PointerOptions::None;
1335 PointerRecord PR(PointeeTI, PK, PM, PO, Ty->getSizeInBits() / 8);
1336 return TypeTable.writeKnownType(PR);
1339 static PointerToMemberRepresentation
1340 translatePtrToMemberRep(unsigned SizeInBytes, bool IsPMF, unsigned Flags) {
1341 // SizeInBytes being zero generally implies that the member pointer type was
1342 // incomplete, which can happen if it is part of a function prototype. In this
1343 // case, use the unknown model instead of the general model.
1345 switch (Flags & DINode::FlagPtrToMemberRep) {
1347 return SizeInBytes == 0 ? PointerToMemberRepresentation::Unknown
1348 : PointerToMemberRepresentation::GeneralFunction;
1349 case DINode::FlagSingleInheritance:
1350 return PointerToMemberRepresentation::SingleInheritanceFunction;
1351 case DINode::FlagMultipleInheritance:
1352 return PointerToMemberRepresentation::MultipleInheritanceFunction;
1353 case DINode::FlagVirtualInheritance:
1354 return PointerToMemberRepresentation::VirtualInheritanceFunction;
1357 switch (Flags & DINode::FlagPtrToMemberRep) {
1359 return SizeInBytes == 0 ? PointerToMemberRepresentation::Unknown
1360 : PointerToMemberRepresentation::GeneralData;
1361 case DINode::FlagSingleInheritance:
1362 return PointerToMemberRepresentation::SingleInheritanceData;
1363 case DINode::FlagMultipleInheritance:
1364 return PointerToMemberRepresentation::MultipleInheritanceData;
1365 case DINode::FlagVirtualInheritance:
1366 return PointerToMemberRepresentation::VirtualInheritanceData;
1369 llvm_unreachable("invalid ptr to member representation");
1372 TypeIndex CodeViewDebug::lowerTypeMemberPointer(const DIDerivedType *Ty) {
1373 assert(Ty->getTag() == dwarf::DW_TAG_ptr_to_member_type);
1374 TypeIndex ClassTI = getTypeIndex(Ty->getClassType());
1375 TypeIndex PointeeTI = getTypeIndex(Ty->getBaseType(), Ty->getClassType());
1376 PointerKind PK = Asm->MAI->getPointerSize() == 8 ? PointerKind::Near64
1377 : PointerKind::Near32;
1378 bool IsPMF = isa<DISubroutineType>(Ty->getBaseType());
1379 PointerMode PM = IsPMF ? PointerMode::PointerToMemberFunction
1380 : PointerMode::PointerToDataMember;
1381 PointerOptions PO = PointerOptions::None; // FIXME
1382 assert(Ty->getSizeInBits() / 8 <= 0xff && "pointer size too big");
1383 uint8_t SizeInBytes = Ty->getSizeInBits() / 8;
1384 MemberPointerInfo MPI(
1385 ClassTI, translatePtrToMemberRep(SizeInBytes, IsPMF, Ty->getFlags()));
1386 PointerRecord PR(PointeeTI, PK, PM, PO, SizeInBytes, MPI);
1387 return TypeTable.writeKnownType(PR);
1390 /// Given a DWARF calling convention, get the CodeView equivalent. If we don't
1391 /// have a translation, use the NearC convention.
1392 static CallingConvention dwarfCCToCodeView(unsigned DwarfCC) {
1394 case dwarf::DW_CC_normal: return CallingConvention::NearC;
1395 case dwarf::DW_CC_BORLAND_msfastcall: return CallingConvention::NearFast;
1396 case dwarf::DW_CC_BORLAND_thiscall: return CallingConvention::ThisCall;
1397 case dwarf::DW_CC_BORLAND_stdcall: return CallingConvention::NearStdCall;
1398 case dwarf::DW_CC_BORLAND_pascal: return CallingConvention::NearPascal;
1399 case dwarf::DW_CC_LLVM_vectorcall: return CallingConvention::NearVector;
1401 return CallingConvention::NearC;
1404 TypeIndex CodeViewDebug::lowerTypeModifier(const DIDerivedType *Ty) {
1405 ModifierOptions Mods = ModifierOptions::None;
1406 bool IsModifier = true;
1407 const DIType *BaseTy = Ty;
1408 while (IsModifier && BaseTy) {
1409 // FIXME: Need to add DWARF tags for __unaligned and _Atomic
1410 switch (BaseTy->getTag()) {
1411 case dwarf::DW_TAG_const_type:
1412 Mods |= ModifierOptions::Const;
1414 case dwarf::DW_TAG_volatile_type:
1415 Mods |= ModifierOptions::Volatile;
1422 BaseTy = cast<DIDerivedType>(BaseTy)->getBaseType().resolve();
1424 TypeIndex ModifiedTI = getTypeIndex(BaseTy);
1425 ModifierRecord MR(ModifiedTI, Mods);
1426 return TypeTable.writeKnownType(MR);
1429 TypeIndex CodeViewDebug::lowerTypeFunction(const DISubroutineType *Ty) {
1430 SmallVector<TypeIndex, 8> ReturnAndArgTypeIndices;
1431 for (DITypeRef ArgTypeRef : Ty->getTypeArray())
1432 ReturnAndArgTypeIndices.push_back(getTypeIndex(ArgTypeRef));
1434 TypeIndex ReturnTypeIndex = TypeIndex::Void();
1435 ArrayRef<TypeIndex> ArgTypeIndices = None;
1436 if (!ReturnAndArgTypeIndices.empty()) {
1437 auto ReturnAndArgTypesRef = makeArrayRef(ReturnAndArgTypeIndices);
1438 ReturnTypeIndex = ReturnAndArgTypesRef.front();
1439 ArgTypeIndices = ReturnAndArgTypesRef.drop_front();
1442 ArgListRecord ArgListRec(TypeRecordKind::ArgList, ArgTypeIndices);
1443 TypeIndex ArgListIndex = TypeTable.writeKnownType(ArgListRec);
1445 CallingConvention CC = dwarfCCToCodeView(Ty->getCC());
1447 ProcedureRecord Procedure(ReturnTypeIndex, CC, FunctionOptions::None,
1448 ArgTypeIndices.size(), ArgListIndex);
1449 return TypeTable.writeKnownType(Procedure);
1452 TypeIndex CodeViewDebug::lowerTypeMemberFunction(const DISubroutineType *Ty,
1453 const DIType *ClassTy,
1454 int ThisAdjustment) {
1455 // Lower the containing class type.
1456 TypeIndex ClassType = getTypeIndex(ClassTy);
1458 SmallVector<TypeIndex, 8> ReturnAndArgTypeIndices;
1459 for (DITypeRef ArgTypeRef : Ty->getTypeArray())
1460 ReturnAndArgTypeIndices.push_back(getTypeIndex(ArgTypeRef));
1462 TypeIndex ReturnTypeIndex = TypeIndex::Void();
1463 ArrayRef<TypeIndex> ArgTypeIndices = None;
1464 if (!ReturnAndArgTypeIndices.empty()) {
1465 auto ReturnAndArgTypesRef = makeArrayRef(ReturnAndArgTypeIndices);
1466 ReturnTypeIndex = ReturnAndArgTypesRef.front();
1467 ArgTypeIndices = ReturnAndArgTypesRef.drop_front();
1469 TypeIndex ThisTypeIndex = TypeIndex::Void();
1470 if (!ArgTypeIndices.empty()) {
1471 ThisTypeIndex = ArgTypeIndices.front();
1472 ArgTypeIndices = ArgTypeIndices.drop_front();
1475 ArgListRecord ArgListRec(TypeRecordKind::ArgList, ArgTypeIndices);
1476 TypeIndex ArgListIndex = TypeTable.writeKnownType(ArgListRec);
1478 CallingConvention CC = dwarfCCToCodeView(Ty->getCC());
1480 // TODO: Need to use the correct values for:
1482 // ThisPointerAdjustment.
1483 MemberFunctionRecord MFR(ReturnTypeIndex, ClassType, ThisTypeIndex, CC,
1484 FunctionOptions::None, ArgTypeIndices.size(),
1485 ArgListIndex, ThisAdjustment);
1486 TypeIndex TI = TypeTable.writeKnownType(MFR);
1491 TypeIndex CodeViewDebug::lowerTypeVFTableShape(const DIDerivedType *Ty) {
1492 unsigned VSlotCount = Ty->getSizeInBits() / (8 * Asm->MAI->getPointerSize());
1493 SmallVector<VFTableSlotKind, 4> Slots(VSlotCount, VFTableSlotKind::Near);
1495 VFTableShapeRecord VFTSR(Slots);
1496 return TypeTable.writeKnownType(VFTSR);
1499 static MemberAccess translateAccessFlags(unsigned RecordTag, unsigned Flags) {
1500 switch (Flags & DINode::FlagAccessibility) {
1501 case DINode::FlagPrivate: return MemberAccess::Private;
1502 case DINode::FlagPublic: return MemberAccess::Public;
1503 case DINode::FlagProtected: return MemberAccess::Protected;
1505 // If there was no explicit access control, provide the default for the tag.
1506 return RecordTag == dwarf::DW_TAG_class_type ? MemberAccess::Private
1507 : MemberAccess::Public;
1509 llvm_unreachable("access flags are exclusive");
1512 static MethodOptions translateMethodOptionFlags(const DISubprogram *SP) {
1513 if (SP->isArtificial())
1514 return MethodOptions::CompilerGenerated;
1516 // FIXME: Handle other MethodOptions.
1518 return MethodOptions::None;
1521 static MethodKind translateMethodKindFlags(const DISubprogram *SP,
1523 switch (SP->getVirtuality()) {
1524 case dwarf::DW_VIRTUALITY_none:
1526 case dwarf::DW_VIRTUALITY_virtual:
1527 return Introduced ? MethodKind::IntroducingVirtual : MethodKind::Virtual;
1528 case dwarf::DW_VIRTUALITY_pure_virtual:
1529 return Introduced ? MethodKind::PureIntroducingVirtual
1530 : MethodKind::PureVirtual;
1532 llvm_unreachable("unhandled virtuality case");
1535 // FIXME: Get Clang to mark DISubprogram as static and do something with it.
1537 return MethodKind::Vanilla;
1540 static TypeRecordKind getRecordKind(const DICompositeType *Ty) {
1541 switch (Ty->getTag()) {
1542 case dwarf::DW_TAG_class_type: return TypeRecordKind::Class;
1543 case dwarf::DW_TAG_structure_type: return TypeRecordKind::Struct;
1545 llvm_unreachable("unexpected tag");
1548 /// Return ClassOptions that should be present on both the forward declaration
1549 /// and the defintion of a tag type.
1550 static ClassOptions getCommonClassOptions(const DICompositeType *Ty) {
1551 ClassOptions CO = ClassOptions::None;
1553 // MSVC always sets this flag, even for local types. Clang doesn't always
1554 // appear to give every type a linkage name, which may be problematic for us.
1555 // FIXME: Investigate the consequences of not following them here.
1556 if (!Ty->getIdentifier().empty())
1557 CO |= ClassOptions::HasUniqueName;
1559 // Put the Nested flag on a type if it appears immediately inside a tag type.
1560 // Do not walk the scope chain. Do not attempt to compute ContainsNestedClass
1561 // here. That flag is only set on definitions, and not forward declarations.
1562 const DIScope *ImmediateScope = Ty->getScope().resolve();
1563 if (ImmediateScope && isa<DICompositeType>(ImmediateScope))
1564 CO |= ClassOptions::Nested;
1566 // Put the Scoped flag on function-local types.
1567 for (const DIScope *Scope = ImmediateScope; Scope != nullptr;
1568 Scope = Scope->getScope().resolve()) {
1569 if (isa<DISubprogram>(Scope)) {
1570 CO |= ClassOptions::Scoped;
1578 TypeIndex CodeViewDebug::lowerTypeEnum(const DICompositeType *Ty) {
1579 ClassOptions CO = getCommonClassOptions(Ty);
1581 unsigned EnumeratorCount = 0;
1583 if (Ty->isForwardDecl()) {
1584 CO |= ClassOptions::ForwardReference;
1586 FieldListRecordBuilder FLRB(TypeTable);
1589 for (const DINode *Element : Ty->getElements()) {
1590 // We assume that the frontend provides all members in source declaration
1591 // order, which is what MSVC does.
1592 if (auto *Enumerator = dyn_cast_or_null<DIEnumerator>(Element)) {
1593 EnumeratorRecord ER(MemberAccess::Public,
1594 APSInt::getUnsigned(Enumerator->getValue()),
1595 Enumerator->getName());
1596 FLRB.writeMemberType(ER);
1603 std::string FullName = getFullyQualifiedName(Ty);
1605 EnumRecord ER(EnumeratorCount, CO, FTI, FullName, Ty->getIdentifier(),
1606 getTypeIndex(Ty->getBaseType()));
1607 return TypeTable.writeKnownType(ER);
1610 //===----------------------------------------------------------------------===//
1612 //===----------------------------------------------------------------------===//
1614 struct llvm::ClassInfo {
1616 const DIDerivedType *MemberTypeNode;
1617 uint64_t BaseOffset;
1620 typedef std::vector<MemberInfo> MemberList;
1622 typedef TinyPtrVector<const DISubprogram *> MethodsList;
1623 // MethodName -> MethodsList
1624 typedef MapVector<MDString *, MethodsList> MethodsMap;
1627 std::vector<const DIDerivedType *> Inheritance;
1631 // Direct overloaded methods gathered by name.
1636 std::vector<const DICompositeType *> NestedClasses;
1639 void CodeViewDebug::clear() {
1640 assert(CurFn == nullptr);
1642 FnDebugInfo.clear();
1643 FileToFilepathMap.clear();
1646 TypeIndices.clear();
1647 CompleteTypeIndices.clear();
1650 void CodeViewDebug::collectMemberInfo(ClassInfo &Info,
1651 const DIDerivedType *DDTy) {
1652 if (!DDTy->getName().empty()) {
1653 Info.Members.push_back({DDTy, 0});
1656 // An unnamed member must represent a nested struct or union. Add all the
1657 // indirect fields to the current record.
1658 assert((DDTy->getOffsetInBits() % 8) == 0 && "Unnamed bitfield member!");
1659 uint64_t Offset = DDTy->getOffsetInBits();
1660 const DIType *Ty = DDTy->getBaseType().resolve();
1661 const DICompositeType *DCTy = cast<DICompositeType>(Ty);
1662 ClassInfo NestedInfo = collectClassInfo(DCTy);
1663 for (const ClassInfo::MemberInfo &IndirectField : NestedInfo.Members)
1664 Info.Members.push_back(
1665 {IndirectField.MemberTypeNode, IndirectField.BaseOffset + Offset});
1668 ClassInfo CodeViewDebug::collectClassInfo(const DICompositeType *Ty) {
1670 // Add elements to structure type.
1671 DINodeArray Elements = Ty->getElements();
1672 for (auto *Element : Elements) {
1673 // We assume that the frontend provides all members in source declaration
1674 // order, which is what MSVC does.
1677 if (auto *SP = dyn_cast<DISubprogram>(Element)) {
1678 Info.Methods[SP->getRawName()].push_back(SP);
1679 } else if (auto *DDTy = dyn_cast<DIDerivedType>(Element)) {
1680 if (DDTy->getTag() == dwarf::DW_TAG_member) {
1681 collectMemberInfo(Info, DDTy);
1682 } else if (DDTy->getTag() == dwarf::DW_TAG_inheritance) {
1683 Info.Inheritance.push_back(DDTy);
1684 } else if (DDTy->getTag() == dwarf::DW_TAG_pointer_type &&
1685 DDTy->getName() == "__vtbl_ptr_type") {
1686 Info.VShapeTI = getTypeIndex(DDTy);
1687 } else if (DDTy->getTag() == dwarf::DW_TAG_friend) {
1688 // Ignore friend members. It appears that MSVC emitted info about
1689 // friends in the past, but modern versions do not.
1691 } else if (auto *Composite = dyn_cast<DICompositeType>(Element)) {
1692 Info.NestedClasses.push_back(Composite);
1694 // Skip other unrecognized kinds of elements.
1699 TypeIndex CodeViewDebug::lowerTypeClass(const DICompositeType *Ty) {
1700 // First, construct the forward decl. Don't look into Ty to compute the
1701 // forward decl options, since it might not be available in all TUs.
1702 TypeRecordKind Kind = getRecordKind(Ty);
1704 ClassOptions::ForwardReference | getCommonClassOptions(Ty);
1705 std::string FullName = getFullyQualifiedName(Ty);
1706 ClassRecord CR(Kind, 0, CO, TypeIndex(), TypeIndex(), TypeIndex(), 0,
1707 FullName, Ty->getIdentifier());
1708 TypeIndex FwdDeclTI = TypeTable.writeKnownType(CR);
1709 if (!Ty->isForwardDecl())
1710 DeferredCompleteTypes.push_back(Ty);
1714 TypeIndex CodeViewDebug::lowerCompleteTypeClass(const DICompositeType *Ty) {
1715 // Construct the field list and complete type record.
1716 TypeRecordKind Kind = getRecordKind(Ty);
1717 ClassOptions CO = getCommonClassOptions(Ty);
1720 unsigned FieldCount;
1721 bool ContainsNestedClass;
1722 std::tie(FieldTI, VShapeTI, FieldCount, ContainsNestedClass) =
1723 lowerRecordFieldList(Ty);
1725 if (ContainsNestedClass)
1726 CO |= ClassOptions::ContainsNestedClass;
1728 std::string FullName = getFullyQualifiedName(Ty);
1730 uint64_t SizeInBytes = Ty->getSizeInBits() / 8;
1732 ClassRecord CR(Kind, FieldCount, CO, FieldTI, TypeIndex(), VShapeTI,
1733 SizeInBytes, FullName, Ty->getIdentifier());
1734 TypeIndex ClassTI = TypeTable.writeKnownType(CR);
1736 StringIdRecord SIDR(TypeIndex(0x0), getFullFilepath(Ty->getFile()));
1737 TypeIndex SIDI = TypeTable.writeKnownType(SIDR);
1738 UdtSourceLineRecord USLR(ClassTI, SIDI, Ty->getLine());
1739 TypeTable.writeKnownType(USLR);
1741 addToUDTs(Ty, ClassTI);
1746 TypeIndex CodeViewDebug::lowerTypeUnion(const DICompositeType *Ty) {
1748 ClassOptions::ForwardReference | getCommonClassOptions(Ty);
1749 std::string FullName = getFullyQualifiedName(Ty);
1750 UnionRecord UR(0, CO, TypeIndex(), 0, FullName, Ty->getIdentifier());
1751 TypeIndex FwdDeclTI = TypeTable.writeKnownType(UR);
1752 if (!Ty->isForwardDecl())
1753 DeferredCompleteTypes.push_back(Ty);
1757 TypeIndex CodeViewDebug::lowerCompleteTypeUnion(const DICompositeType *Ty) {
1758 ClassOptions CO = ClassOptions::Sealed | getCommonClassOptions(Ty);
1760 unsigned FieldCount;
1761 bool ContainsNestedClass;
1762 std::tie(FieldTI, std::ignore, FieldCount, ContainsNestedClass) =
1763 lowerRecordFieldList(Ty);
1765 if (ContainsNestedClass)
1766 CO |= ClassOptions::ContainsNestedClass;
1768 uint64_t SizeInBytes = Ty->getSizeInBits() / 8;
1769 std::string FullName = getFullyQualifiedName(Ty);
1771 UnionRecord UR(FieldCount, CO, FieldTI, SizeInBytes, FullName,
1772 Ty->getIdentifier());
1773 TypeIndex UnionTI = TypeTable.writeKnownType(UR);
1775 StringIdRecord SIR(TypeIndex(0x0), getFullFilepath(Ty->getFile()));
1776 TypeIndex SIRI = TypeTable.writeKnownType(SIR);
1777 UdtSourceLineRecord USLR(UnionTI, SIRI, Ty->getLine());
1778 TypeTable.writeKnownType(USLR);
1780 addToUDTs(Ty, UnionTI);
1785 std::tuple<TypeIndex, TypeIndex, unsigned, bool>
1786 CodeViewDebug::lowerRecordFieldList(const DICompositeType *Ty) {
1787 // Manually count members. MSVC appears to count everything that generates a
1788 // field list record. Each individual overload in a method overload group
1789 // contributes to this count, even though the overload group is a single field
1791 unsigned MemberCount = 0;
1792 ClassInfo Info = collectClassInfo(Ty);
1793 FieldListRecordBuilder FLBR(TypeTable);
1796 // Create base classes.
1797 for (const DIDerivedType *I : Info.Inheritance) {
1798 if (I->getFlags() & DINode::FlagVirtual) {
1800 // FIXME: Emit VBPtrOffset when the frontend provides it.
1801 unsigned VBPtrOffset = 0;
1802 // FIXME: Despite the accessor name, the offset is really in bytes.
1803 unsigned VBTableIndex = I->getOffsetInBits() / 4;
1804 auto RecordKind = (I->getFlags() & DINode::FlagIndirectVirtualBase) == DINode::FlagIndirectVirtualBase
1805 ? TypeRecordKind::IndirectVirtualBaseClass
1806 : TypeRecordKind::VirtualBaseClass;
1807 VirtualBaseClassRecord VBCR(
1808 RecordKind, translateAccessFlags(Ty->getTag(), I->getFlags()),
1809 getTypeIndex(I->getBaseType()), getVBPTypeIndex(), VBPtrOffset,
1812 FLBR.writeMemberType(VBCR);
1814 assert(I->getOffsetInBits() % 8 == 0 &&
1815 "bases must be on byte boundaries");
1816 BaseClassRecord BCR(translateAccessFlags(Ty->getTag(), I->getFlags()),
1817 getTypeIndex(I->getBaseType()),
1818 I->getOffsetInBits() / 8);
1819 FLBR.writeMemberType(BCR);
1824 for (ClassInfo::MemberInfo &MemberInfo : Info.Members) {
1825 const DIDerivedType *Member = MemberInfo.MemberTypeNode;
1826 TypeIndex MemberBaseType = getTypeIndex(Member->getBaseType());
1827 StringRef MemberName = Member->getName();
1828 MemberAccess Access =
1829 translateAccessFlags(Ty->getTag(), Member->getFlags());
1831 if (Member->isStaticMember()) {
1832 StaticDataMemberRecord SDMR(Access, MemberBaseType, MemberName);
1833 FLBR.writeMemberType(SDMR);
1838 // Virtual function pointer member.
1839 if ((Member->getFlags() & DINode::FlagArtificial) &&
1840 Member->getName().startswith("_vptr$")) {
1841 VFPtrRecord VFPR(getTypeIndex(Member->getBaseType()));
1842 FLBR.writeMemberType(VFPR);
1848 uint64_t MemberOffsetInBits =
1849 Member->getOffsetInBits() + MemberInfo.BaseOffset;
1850 if (Member->isBitField()) {
1851 uint64_t StartBitOffset = MemberOffsetInBits;
1852 if (const auto *CI =
1853 dyn_cast_or_null<ConstantInt>(Member->getStorageOffsetInBits())) {
1854 MemberOffsetInBits = CI->getZExtValue() + MemberInfo.BaseOffset;
1856 StartBitOffset -= MemberOffsetInBits;
1857 BitFieldRecord BFR(MemberBaseType, Member->getSizeInBits(),
1859 MemberBaseType = TypeTable.writeKnownType(BFR);
1861 uint64_t MemberOffsetInBytes = MemberOffsetInBits / 8;
1862 DataMemberRecord DMR(Access, MemberBaseType, MemberOffsetInBytes,
1864 FLBR.writeMemberType(DMR);
1869 for (auto &MethodItr : Info.Methods) {
1870 StringRef Name = MethodItr.first->getString();
1872 std::vector<OneMethodRecord> Methods;
1873 for (const DISubprogram *SP : MethodItr.second) {
1874 TypeIndex MethodType = getMemberFunctionType(SP, Ty);
1875 bool Introduced = SP->getFlags() & DINode::FlagIntroducedVirtual;
1877 unsigned VFTableOffset = -1;
1879 VFTableOffset = SP->getVirtualIndex() * getPointerSizeInBytes();
1881 Methods.push_back(OneMethodRecord(
1882 MethodType, translateAccessFlags(Ty->getTag(), SP->getFlags()),
1883 translateMethodKindFlags(SP, Introduced),
1884 translateMethodOptionFlags(SP), VFTableOffset, Name));
1887 assert(Methods.size() > 0 && "Empty methods map entry");
1888 if (Methods.size() == 1)
1889 FLBR.writeMemberType(Methods[0]);
1891 MethodOverloadListRecord MOLR(Methods);
1892 TypeIndex MethodList = TypeTable.writeKnownType(MOLR);
1893 OverloadedMethodRecord OMR(Methods.size(), MethodList, Name);
1894 FLBR.writeMemberType(OMR);
1898 // Create nested classes.
1899 for (const DICompositeType *Nested : Info.NestedClasses) {
1900 NestedTypeRecord R(getTypeIndex(DITypeRef(Nested)), Nested->getName());
1901 FLBR.writeMemberType(R);
1905 TypeIndex FieldTI = FLBR.end();
1906 return std::make_tuple(FieldTI, Info.VShapeTI, MemberCount,
1907 !Info.NestedClasses.empty());
1910 TypeIndex CodeViewDebug::getVBPTypeIndex() {
1911 if (!VBPType.getIndex()) {
1912 // Make a 'const int *' type.
1913 ModifierRecord MR(TypeIndex::Int32(), ModifierOptions::Const);
1914 TypeIndex ModifiedTI = TypeTable.writeKnownType(MR);
1916 PointerKind PK = getPointerSizeInBytes() == 8 ? PointerKind::Near64
1917 : PointerKind::Near32;
1918 PointerMode PM = PointerMode::Pointer;
1919 PointerOptions PO = PointerOptions::None;
1920 PointerRecord PR(ModifiedTI, PK, PM, PO, getPointerSizeInBytes());
1922 VBPType = TypeTable.writeKnownType(PR);
1928 TypeIndex CodeViewDebug::getTypeIndex(DITypeRef TypeRef, DITypeRef ClassTyRef) {
1929 const DIType *Ty = TypeRef.resolve();
1930 const DIType *ClassTy = ClassTyRef.resolve();
1932 // The null DIType is the void type. Don't try to hash it.
1934 return TypeIndex::Void();
1936 // Check if we've already translated this type. Don't try to do a
1937 // get-or-create style insertion that caches the hash lookup across the
1938 // lowerType call. It will update the TypeIndices map.
1939 auto I = TypeIndices.find({Ty, ClassTy});
1940 if (I != TypeIndices.end())
1943 TypeLoweringScope S(*this);
1944 TypeIndex TI = lowerType(Ty, ClassTy);
1945 return recordTypeIndexForDINode(Ty, TI, ClassTy);
1948 TypeIndex CodeViewDebug::getCompleteTypeIndex(DITypeRef TypeRef) {
1949 const DIType *Ty = TypeRef.resolve();
1951 // The null DIType is the void type. Don't try to hash it.
1953 return TypeIndex::Void();
1955 // If this is a non-record type, the complete type index is the same as the
1956 // normal type index. Just call getTypeIndex.
1957 switch (Ty->getTag()) {
1958 case dwarf::DW_TAG_class_type:
1959 case dwarf::DW_TAG_structure_type:
1960 case dwarf::DW_TAG_union_type:
1963 return getTypeIndex(Ty);
1966 // Check if we've already translated the complete record type. Lowering a
1967 // complete type should never trigger lowering another complete type, so we
1968 // can reuse the hash table lookup result.
1969 const auto *CTy = cast<DICompositeType>(Ty);
1970 auto InsertResult = CompleteTypeIndices.insert({CTy, TypeIndex()});
1971 if (!InsertResult.second)
1972 return InsertResult.first->second;
1974 TypeLoweringScope S(*this);
1976 // Make sure the forward declaration is emitted first. It's unclear if this
1977 // is necessary, but MSVC does it, and we should follow suit until we can show
1979 TypeIndex FwdDeclTI = getTypeIndex(CTy);
1981 // Just use the forward decl if we don't have complete type info. This might
1982 // happen if the frontend is using modules and expects the complete definition
1983 // to be emitted elsewhere.
1984 if (CTy->isForwardDecl())
1988 switch (CTy->getTag()) {
1989 case dwarf::DW_TAG_class_type:
1990 case dwarf::DW_TAG_structure_type:
1991 TI = lowerCompleteTypeClass(CTy);
1993 case dwarf::DW_TAG_union_type:
1994 TI = lowerCompleteTypeUnion(CTy);
1997 llvm_unreachable("not a record");
2000 InsertResult.first->second = TI;
2004 /// Emit all the deferred complete record types. Try to do this in FIFO order,
2005 /// and do this until fixpoint, as each complete record type typically
2007 /// many other record types.
2008 void CodeViewDebug::emitDeferredCompleteTypes() {
2009 SmallVector<const DICompositeType *, 4> TypesToEmit;
2010 while (!DeferredCompleteTypes.empty()) {
2011 std::swap(DeferredCompleteTypes, TypesToEmit);
2012 for (const DICompositeType *RecordTy : TypesToEmit)
2013 getCompleteTypeIndex(RecordTy);
2014 TypesToEmit.clear();
2018 void CodeViewDebug::emitLocalVariableList(ArrayRef<LocalVariable> Locals) {
2019 // Get the sorted list of parameters and emit them first.
2020 SmallVector<const LocalVariable *, 6> Params;
2021 for (const LocalVariable &L : Locals)
2022 if (L.DIVar->isParameter())
2023 Params.push_back(&L);
2024 std::sort(Params.begin(), Params.end(),
2025 [](const LocalVariable *L, const LocalVariable *R) {
2026 return L->DIVar->getArg() < R->DIVar->getArg();
2028 for (const LocalVariable *L : Params)
2029 emitLocalVariable(*L);
2031 // Next emit all non-parameters in the order that we found them.
2032 for (const LocalVariable &L : Locals)
2033 if (!L.DIVar->isParameter())
2034 emitLocalVariable(L);
2037 void CodeViewDebug::emitLocalVariable(const LocalVariable &Var) {
2038 // LocalSym record, see SymbolRecord.h for more info.
2039 MCSymbol *LocalBegin = MMI->getContext().createTempSymbol(),
2040 *LocalEnd = MMI->getContext().createTempSymbol();
2041 OS.AddComment("Record length");
2042 OS.emitAbsoluteSymbolDiff(LocalEnd, LocalBegin, 2);
2043 OS.EmitLabel(LocalBegin);
2045 OS.AddComment("Record kind: S_LOCAL");
2046 OS.EmitIntValue(unsigned(SymbolKind::S_LOCAL), 2);
2048 LocalSymFlags Flags = LocalSymFlags::None;
2049 if (Var.DIVar->isParameter())
2050 Flags |= LocalSymFlags::IsParameter;
2051 if (Var.DefRanges.empty())
2052 Flags |= LocalSymFlags::IsOptimizedOut;
2054 OS.AddComment("TypeIndex");
2055 TypeIndex TI = getCompleteTypeIndex(Var.DIVar->getType());
2056 OS.EmitIntValue(TI.getIndex(), 4);
2057 OS.AddComment("Flags");
2058 OS.EmitIntValue(static_cast<uint16_t>(Flags), 2);
2059 // Truncate the name so we won't overflow the record length field.
2060 emitNullTerminatedSymbolName(OS, Var.DIVar->getName());
2061 OS.EmitLabel(LocalEnd);
2063 // Calculate the on disk prefix of the appropriate def range record. The
2064 // records and on disk formats are described in SymbolRecords.h. BytePrefix
2065 // should be big enough to hold all forms without memory allocation.
2066 SmallString<20> BytePrefix;
2067 for (const LocalVarDefRange &DefRange : Var.DefRanges) {
2069 if (DefRange.InMemory) {
2070 uint16_t RegRelFlags = 0;
2071 if (DefRange.IsSubfield) {
2072 RegRelFlags = DefRangeRegisterRelSym::IsSubfieldFlag |
2073 (DefRange.StructOffset
2074 << DefRangeRegisterRelSym::OffsetInParentShift);
2076 DefRangeRegisterRelSym Sym(S_DEFRANGE_REGISTER_REL);
2077 Sym.Hdr.Register = DefRange.CVRegister;
2078 Sym.Hdr.Flags = RegRelFlags;
2079 Sym.Hdr.BasePointerOffset = DefRange.DataOffset;
2080 ulittle16_t SymKind = ulittle16_t(S_DEFRANGE_REGISTER_REL);
2082 StringRef(reinterpret_cast<const char *>(&SymKind), sizeof(SymKind));
2084 StringRef(reinterpret_cast<const char *>(&Sym.Hdr), sizeof(Sym.Hdr));
2086 assert(DefRange.DataOffset == 0 && "unexpected offset into register");
2087 if (DefRange.IsSubfield) {
2088 // Unclear what matters here.
2089 DefRangeSubfieldRegisterSym Sym(S_DEFRANGE_SUBFIELD_REGISTER);
2090 Sym.Hdr.Register = DefRange.CVRegister;
2091 Sym.Hdr.MayHaveNoName = 0;
2092 Sym.Hdr.OffsetInParent = DefRange.StructOffset;
2094 ulittle16_t SymKind = ulittle16_t(S_DEFRANGE_SUBFIELD_REGISTER);
2095 BytePrefix += StringRef(reinterpret_cast<const char *>(&SymKind),
2097 BytePrefix += StringRef(reinterpret_cast<const char *>(&Sym.Hdr),
2100 // Unclear what matters here.
2101 DefRangeRegisterSym Sym(S_DEFRANGE_REGISTER);
2102 Sym.Hdr.Register = DefRange.CVRegister;
2103 Sym.Hdr.MayHaveNoName = 0;
2104 ulittle16_t SymKind = ulittle16_t(S_DEFRANGE_REGISTER);
2105 BytePrefix += StringRef(reinterpret_cast<const char *>(&SymKind),
2107 BytePrefix += StringRef(reinterpret_cast<const char *>(&Sym.Hdr),
2111 OS.EmitCVDefRangeDirective(DefRange.Ranges, BytePrefix);
2115 void CodeViewDebug::endFunction(const MachineFunction *MF) {
2116 if (!Asm || !CurFn) // We haven't created any debug info for this function.
2119 const Function *GV = MF->getFunction();
2120 assert(FnDebugInfo.count(GV));
2121 assert(CurFn == &FnDebugInfo[GV]);
2123 collectVariableInfo(GV->getSubprogram());
2125 DebugHandlerBase::endFunction(MF);
2127 // Don't emit anything if we don't have any line tables.
2128 if (!CurFn->HaveLineInfo) {
2129 FnDebugInfo.erase(GV);
2134 CurFn->End = Asm->getFunctionEnd();
2139 void CodeViewDebug::beginInstruction(const MachineInstr *MI) {
2140 DebugHandlerBase::beginInstruction(MI);
2142 // Ignore DBG_VALUE locations and function prologue.
2143 if (!Asm || !CurFn || MI->isDebugValue() ||
2144 MI->getFlag(MachineInstr::FrameSetup))
2146 DebugLoc DL = MI->getDebugLoc();
2147 if (DL == PrevInstLoc || !DL)
2149 maybeRecordLocation(DL, Asm->MF);
2152 MCSymbol *CodeViewDebug::beginCVSubsection(ModuleSubstreamKind Kind) {
2153 MCSymbol *BeginLabel = MMI->getContext().createTempSymbol(),
2154 *EndLabel = MMI->getContext().createTempSymbol();
2155 OS.EmitIntValue(unsigned(Kind), 4);
2156 OS.AddComment("Subsection size");
2157 OS.emitAbsoluteSymbolDiff(EndLabel, BeginLabel, 4);
2158 OS.EmitLabel(BeginLabel);
2162 void CodeViewDebug::endCVSubsection(MCSymbol *EndLabel) {
2163 OS.EmitLabel(EndLabel);
2164 // Every subsection must be aligned to a 4-byte boundary.
2165 OS.EmitValueToAlignment(4);
2168 void CodeViewDebug::emitDebugInfoForUDTs(
2169 ArrayRef<std::pair<std::string, TypeIndex>> UDTs) {
2170 for (const std::pair<std::string, codeview::TypeIndex> &UDT : UDTs) {
2171 MCSymbol *UDTRecordBegin = MMI->getContext().createTempSymbol(),
2172 *UDTRecordEnd = MMI->getContext().createTempSymbol();
2173 OS.AddComment("Record length");
2174 OS.emitAbsoluteSymbolDiff(UDTRecordEnd, UDTRecordBegin, 2);
2175 OS.EmitLabel(UDTRecordBegin);
2177 OS.AddComment("Record kind: S_UDT");
2178 OS.EmitIntValue(unsigned(SymbolKind::S_UDT), 2);
2180 OS.AddComment("Type");
2181 OS.EmitIntValue(UDT.second.getIndex(), 4);
2183 emitNullTerminatedSymbolName(OS, UDT.first);
2184 OS.EmitLabel(UDTRecordEnd);
2188 void CodeViewDebug::emitDebugInfoForGlobals() {
2189 DenseMap<const DIGlobalVariableExpression *, const GlobalVariable *>
2191 for (const GlobalVariable &GV : MMI->getModule()->globals()) {
2192 SmallVector<DIGlobalVariableExpression *, 1> GVEs;
2193 GV.getDebugInfo(GVEs);
2194 for (const auto *GVE : GVEs)
2195 GlobalMap[GVE] = &GV;
2198 NamedMDNode *CUs = MMI->getModule()->getNamedMetadata("llvm.dbg.cu");
2199 for (const MDNode *Node : CUs->operands()) {
2200 const auto *CU = cast<DICompileUnit>(Node);
2202 // First, emit all globals that are not in a comdat in a single symbol
2203 // substream. MSVC doesn't like it if the substream is empty, so only open
2204 // it if we have at least one global to emit.
2205 switchToDebugSectionForSymbol(nullptr);
2206 MCSymbol *EndLabel = nullptr;
2207 for (const auto *GVE : CU->getGlobalVariables()) {
2208 if (const auto *GV = GlobalMap.lookup(GVE))
2209 if (!GV->hasComdat() && !GV->isDeclarationForLinker()) {
2211 OS.AddComment("Symbol subsection for globals");
2212 EndLabel = beginCVSubsection(ModuleSubstreamKind::Symbols);
2214 // FIXME: emitDebugInfoForGlobal() doesn't handle DIExpressions.
2215 emitDebugInfoForGlobal(GVE->getVariable(), GV, Asm->getSymbol(GV));
2219 endCVSubsection(EndLabel);
2221 // Second, emit each global that is in a comdat into its own .debug$S
2222 // section along with its own symbol substream.
2223 for (const auto *GVE : CU->getGlobalVariables()) {
2224 if (const auto *GV = GlobalMap.lookup(GVE)) {
2225 if (GV->hasComdat()) {
2226 MCSymbol *GVSym = Asm->getSymbol(GV);
2227 OS.AddComment("Symbol subsection for " +
2228 Twine(GlobalValue::getRealLinkageName(GV->getName())));
2229 switchToDebugSectionForSymbol(GVSym);
2230 EndLabel = beginCVSubsection(ModuleSubstreamKind::Symbols);
2231 // FIXME: emitDebugInfoForGlobal() doesn't handle DIExpressions.
2232 emitDebugInfoForGlobal(GVE->getVariable(), GV, GVSym);
2233 endCVSubsection(EndLabel);
2240 void CodeViewDebug::emitDebugInfoForRetainedTypes() {
2241 NamedMDNode *CUs = MMI->getModule()->getNamedMetadata("llvm.dbg.cu");
2242 for (const MDNode *Node : CUs->operands()) {
2243 for (auto *Ty : cast<DICompileUnit>(Node)->getRetainedTypes()) {
2244 if (DIType *RT = dyn_cast<DIType>(Ty)) {
2246 // FIXME: Add to global/local DTU list.
2252 void CodeViewDebug::emitDebugInfoForGlobal(const DIGlobalVariable *DIGV,
2253 const GlobalVariable *GV,
2255 // DataSym record, see SymbolRecord.h for more info.
2256 // FIXME: Thread local data, etc
2257 MCSymbol *DataBegin = MMI->getContext().createTempSymbol(),
2258 *DataEnd = MMI->getContext().createTempSymbol();
2259 OS.AddComment("Record length");
2260 OS.emitAbsoluteSymbolDiff(DataEnd, DataBegin, 2);
2261 OS.EmitLabel(DataBegin);
2262 if (DIGV->isLocalToUnit()) {
2263 if (GV->isThreadLocal()) {
2264 OS.AddComment("Record kind: S_LTHREAD32");
2265 OS.EmitIntValue(unsigned(SymbolKind::S_LTHREAD32), 2);
2267 OS.AddComment("Record kind: S_LDATA32");
2268 OS.EmitIntValue(unsigned(SymbolKind::S_LDATA32), 2);
2271 if (GV->isThreadLocal()) {
2272 OS.AddComment("Record kind: S_GTHREAD32");
2273 OS.EmitIntValue(unsigned(SymbolKind::S_GTHREAD32), 2);
2275 OS.AddComment("Record kind: S_GDATA32");
2276 OS.EmitIntValue(unsigned(SymbolKind::S_GDATA32), 2);
2279 OS.AddComment("Type");
2280 OS.EmitIntValue(getCompleteTypeIndex(DIGV->getType()).getIndex(), 4);
2281 OS.AddComment("DataOffset");
2282 OS.EmitCOFFSecRel32(GVSym, /*Offset=*/0);
2283 OS.AddComment("Segment");
2284 OS.EmitCOFFSectionIndex(GVSym);
2285 OS.AddComment("Name");
2286 emitNullTerminatedSymbolName(OS, DIGV->getName());
2287 OS.EmitLabel(DataEnd);