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/CVTypeDumper.h"
17 #include "llvm/DebugInfo/CodeView/CVTypeVisitor.h"
18 #include "llvm/DebugInfo/CodeView/CodeView.h"
19 #include "llvm/DebugInfo/CodeView/Line.h"
20 #include "llvm/DebugInfo/CodeView/SymbolRecord.h"
21 #include "llvm/DebugInfo/CodeView/TypeDatabase.h"
22 #include "llvm/DebugInfo/CodeView/TypeDumpVisitor.h"
23 #include "llvm/DebugInfo/CodeView/TypeIndex.h"
24 #include "llvm/DebugInfo/CodeView/TypeRecord.h"
25 #include "llvm/DebugInfo/CodeView/TypeVisitorCallbacks.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/BinaryByteStream.h"
32 #include "llvm/Support/BinaryStreamReader.h"
33 #include "llvm/Support/COFF.h"
34 #include "llvm/Support/ScopedPrinter.h"
35 #include "llvm/Target/TargetFrameLowering.h"
36 #include "llvm/Target/TargetRegisterInfo.h"
37 #include "llvm/Target/TargetSubtargetInfo.h"
40 using namespace llvm::codeview;
42 CodeViewDebug::CodeViewDebug(AsmPrinter *AP)
43 : DebugHandlerBase(AP), OS(*Asm->OutStreamer), Allocator(),
44 TypeTable(Allocator), CurFn(nullptr) {
45 // If module doesn't have named metadata anchors or COFF debug section
46 // is not available, skip any debug info related stuff.
47 if (!MMI->getModule()->getNamedMetadata("llvm.dbg.cu") ||
48 !AP->getObjFileLowering().getCOFFDebugSymbolsSection()) {
53 // Tell MMI that we have debug info.
54 MMI->setDebugInfoAvailability(true);
57 StringRef CodeViewDebug::getFullFilepath(const DIFile *File) {
58 std::string &Filepath = FileToFilepathMap[File];
59 if (!Filepath.empty())
62 StringRef Dir = File->getDirectory(), Filename = File->getFilename();
64 // Clang emits directory and relative filename info into the IR, but CodeView
65 // operates on full paths. We could change Clang to emit full paths too, but
66 // that would increase the IR size and probably not needed for other users.
67 // For now, just concatenate and canonicalize the path here.
68 if (Filename.find(':') == 1)
71 Filepath = (Dir + "\\" + Filename).str();
73 // Canonicalize the path. We have to do it textually because we may no longer
74 // have access the file in the filesystem.
75 // First, replace all slashes with backslashes.
76 std::replace(Filepath.begin(), Filepath.end(), '/', '\\');
78 // Remove all "\.\" with "\".
80 while ((Cursor = Filepath.find("\\.\\", Cursor)) != std::string::npos)
81 Filepath.erase(Cursor, 2);
83 // Replace all "\XXX\..\" with "\". Don't try too hard though as the original
84 // path should be well-formatted, e.g. start with a drive letter, etc.
86 while ((Cursor = Filepath.find("\\..\\", Cursor)) != std::string::npos) {
87 // Something's wrong if the path starts with "\..\", abort.
91 size_t PrevSlash = Filepath.rfind('\\', Cursor - 1);
92 if (PrevSlash == std::string::npos)
93 // Something's wrong, abort.
96 Filepath.erase(PrevSlash, Cursor + 3 - PrevSlash);
97 // The next ".." might be following the one we've just erased.
101 // Remove all duplicate backslashes.
103 while ((Cursor = Filepath.find("\\\\", Cursor)) != std::string::npos)
104 Filepath.erase(Cursor, 1);
109 unsigned CodeViewDebug::maybeRecordFile(const DIFile *F) {
110 unsigned NextId = FileIdMap.size() + 1;
111 auto Insertion = FileIdMap.insert(std::make_pair(F, NextId));
112 if (Insertion.second) {
113 // We have to compute the full filepath and emit a .cv_file directive.
114 StringRef FullPath = getFullFilepath(F);
115 bool Success = OS.EmitCVFileDirective(NextId, FullPath);
117 assert(Success && ".cv_file directive failed");
119 return Insertion.first->second;
122 CodeViewDebug::InlineSite &
123 CodeViewDebug::getInlineSite(const DILocation *InlinedAt,
124 const DISubprogram *Inlinee) {
125 auto SiteInsertion = CurFn->InlineSites.insert({InlinedAt, InlineSite()});
126 InlineSite *Site = &SiteInsertion.first->second;
127 if (SiteInsertion.second) {
128 unsigned ParentFuncId = CurFn->FuncId;
129 if (const DILocation *OuterIA = InlinedAt->getInlinedAt())
131 getInlineSite(OuterIA, InlinedAt->getScope()->getSubprogram())
134 Site->SiteFuncId = NextFuncId++;
135 OS.EmitCVInlineSiteIdDirective(
136 Site->SiteFuncId, ParentFuncId, maybeRecordFile(InlinedAt->getFile()),
137 InlinedAt->getLine(), InlinedAt->getColumn(), SMLoc());
138 Site->Inlinee = Inlinee;
139 InlinedSubprograms.insert(Inlinee);
140 getFuncIdForSubprogram(Inlinee);
145 static StringRef getPrettyScopeName(const DIScope *Scope) {
146 StringRef ScopeName = Scope->getName();
147 if (!ScopeName.empty())
150 switch (Scope->getTag()) {
151 case dwarf::DW_TAG_enumeration_type:
152 case dwarf::DW_TAG_class_type:
153 case dwarf::DW_TAG_structure_type:
154 case dwarf::DW_TAG_union_type:
155 return "<unnamed-tag>";
156 case dwarf::DW_TAG_namespace:
157 return "`anonymous namespace'";
163 static const DISubprogram *getQualifiedNameComponents(
164 const DIScope *Scope, SmallVectorImpl<StringRef> &QualifiedNameComponents) {
165 const DISubprogram *ClosestSubprogram = nullptr;
166 while (Scope != nullptr) {
167 if (ClosestSubprogram == nullptr)
168 ClosestSubprogram = dyn_cast<DISubprogram>(Scope);
169 StringRef ScopeName = getPrettyScopeName(Scope);
170 if (!ScopeName.empty())
171 QualifiedNameComponents.push_back(ScopeName);
172 Scope = Scope->getScope().resolve();
174 return ClosestSubprogram;
177 static std::string getQualifiedName(ArrayRef<StringRef> QualifiedNameComponents,
178 StringRef TypeName) {
179 std::string FullyQualifiedName;
180 for (StringRef QualifiedNameComponent : reverse(QualifiedNameComponents)) {
181 FullyQualifiedName.append(QualifiedNameComponent);
182 FullyQualifiedName.append("::");
184 FullyQualifiedName.append(TypeName);
185 return FullyQualifiedName;
188 static std::string getFullyQualifiedName(const DIScope *Scope, StringRef Name) {
189 SmallVector<StringRef, 5> QualifiedNameComponents;
190 getQualifiedNameComponents(Scope, QualifiedNameComponents);
191 return getQualifiedName(QualifiedNameComponents, Name);
194 struct CodeViewDebug::TypeLoweringScope {
195 TypeLoweringScope(CodeViewDebug &CVD) : CVD(CVD) { ++CVD.TypeEmissionLevel; }
196 ~TypeLoweringScope() {
197 // Don't decrement TypeEmissionLevel until after emitting deferred types, so
198 // inner TypeLoweringScopes don't attempt to emit deferred types.
199 if (CVD.TypeEmissionLevel == 1)
200 CVD.emitDeferredCompleteTypes();
201 --CVD.TypeEmissionLevel;
206 static std::string getFullyQualifiedName(const DIScope *Ty) {
207 const DIScope *Scope = Ty->getScope().resolve();
208 return getFullyQualifiedName(Scope, getPrettyScopeName(Ty));
211 TypeIndex CodeViewDebug::getScopeIndex(const DIScope *Scope) {
212 // No scope means global scope and that uses the zero index.
213 if (!Scope || isa<DIFile>(Scope))
216 assert(!isa<DIType>(Scope) && "shouldn't make a namespace scope for a type");
218 // Check if we've already translated this scope.
219 auto I = TypeIndices.find({Scope, nullptr});
220 if (I != TypeIndices.end())
223 // Build the fully qualified name of the scope.
224 std::string ScopeName = getFullyQualifiedName(Scope);
225 StringIdRecord SID(TypeIndex(), ScopeName);
226 auto TI = TypeTable.writeKnownType(SID);
227 return recordTypeIndexForDINode(Scope, TI);
230 TypeIndex CodeViewDebug::getFuncIdForSubprogram(const DISubprogram *SP) {
233 // Check if we've already translated this subprogram.
234 auto I = TypeIndices.find({SP, nullptr});
235 if (I != TypeIndices.end())
238 // The display name includes function template arguments. Drop them to match
240 StringRef DisplayName = SP->getDisplayName().split('<').first;
242 const DIScope *Scope = SP->getScope().resolve();
244 if (const auto *Class = dyn_cast_or_null<DICompositeType>(Scope)) {
245 // If the scope is a DICompositeType, then this must be a method. Member
246 // function types take some special handling, and require access to the
248 TypeIndex ClassType = getTypeIndex(Class);
249 MemberFuncIdRecord MFuncId(ClassType, getMemberFunctionType(SP, Class),
251 TI = TypeTable.writeKnownType(MFuncId);
253 // Otherwise, this must be a free function.
254 TypeIndex ParentScope = getScopeIndex(Scope);
255 FuncIdRecord FuncId(ParentScope, getTypeIndex(SP->getType()), DisplayName);
256 TI = TypeTable.writeKnownType(FuncId);
259 return recordTypeIndexForDINode(SP, TI);
262 TypeIndex CodeViewDebug::getMemberFunctionType(const DISubprogram *SP,
263 const DICompositeType *Class) {
264 // Always use the method declaration as the key for the function type. The
265 // method declaration contains the this adjustment.
266 if (SP->getDeclaration())
267 SP = SP->getDeclaration();
268 assert(!SP->getDeclaration() && "should use declaration as key");
270 // Key the MemberFunctionRecord into the map as {SP, Class}. It won't collide
271 // with the MemberFuncIdRecord, which is keyed in as {SP, nullptr}.
272 auto I = TypeIndices.find({SP, Class});
273 if (I != TypeIndices.end())
276 // Make sure complete type info for the class is emitted *after* the member
277 // function type, as the complete class type is likely to reference this
278 // member function type.
279 TypeLoweringScope S(*this);
281 lowerTypeMemberFunction(SP->getType(), Class, SP->getThisAdjustment());
282 return recordTypeIndexForDINode(SP, TI, Class);
285 TypeIndex CodeViewDebug::recordTypeIndexForDINode(const DINode *Node,
287 const DIType *ClassTy) {
288 auto InsertResult = TypeIndices.insert({{Node, ClassTy}, TI});
290 assert(InsertResult.second && "DINode was already assigned a type index");
294 unsigned CodeViewDebug::getPointerSizeInBytes() {
295 return MMI->getModule()->getDataLayout().getPointerSizeInBits() / 8;
298 void CodeViewDebug::recordLocalVariable(LocalVariable &&Var,
299 const DILocation *InlinedAt) {
301 // This variable was inlined. Associate it with the InlineSite.
302 const DISubprogram *Inlinee = Var.DIVar->getScope()->getSubprogram();
303 InlineSite &Site = getInlineSite(InlinedAt, Inlinee);
304 Site.InlinedLocals.emplace_back(Var);
306 // This variable goes in the main ProcSym.
307 CurFn->Locals.emplace_back(Var);
311 static void addLocIfNotPresent(SmallVectorImpl<const DILocation *> &Locs,
312 const DILocation *Loc) {
313 auto B = Locs.begin(), E = Locs.end();
314 if (std::find(B, E, Loc) == E)
318 void CodeViewDebug::maybeRecordLocation(const DebugLoc &DL,
319 const MachineFunction *MF) {
320 // Skip this instruction if it has the same location as the previous one.
321 if (DL == CurFn->LastLoc)
324 const DIScope *Scope = DL.get()->getScope();
328 // Skip this line if it is longer than the maximum we can record.
329 LineInfo LI(DL.getLine(), DL.getLine(), /*IsStatement=*/true);
330 if (LI.getStartLine() != DL.getLine() || LI.isAlwaysStepInto() ||
331 LI.isNeverStepInto())
334 ColumnInfo CI(DL.getCol(), /*EndColumn=*/0);
335 if (CI.getStartColumn() != DL.getCol())
338 if (!CurFn->HaveLineInfo)
339 CurFn->HaveLineInfo = true;
341 if (CurFn->LastLoc.get() && CurFn->LastLoc->getFile() == DL->getFile())
342 FileId = CurFn->LastFileId;
344 FileId = CurFn->LastFileId = maybeRecordFile(DL->getFile());
347 unsigned FuncId = CurFn->FuncId;
348 if (const DILocation *SiteLoc = DL->getInlinedAt()) {
349 const DILocation *Loc = DL.get();
351 // If this location was actually inlined from somewhere else, give it the ID
352 // of the inline call site.
354 getInlineSite(SiteLoc, Loc->getScope()->getSubprogram()).SiteFuncId;
356 // Ensure we have links in the tree of inline call sites.
357 bool FirstLoc = true;
358 while ((SiteLoc = Loc->getInlinedAt())) {
360 getInlineSite(SiteLoc, Loc->getScope()->getSubprogram());
362 addLocIfNotPresent(Site.ChildSites, Loc);
366 addLocIfNotPresent(CurFn->ChildSites, Loc);
369 OS.EmitCVLocDirective(FuncId, FileId, DL.getLine(), DL.getCol(),
370 /*PrologueEnd=*/false, /*IsStmt=*/false,
371 DL->getFilename(), SMLoc());
374 void CodeViewDebug::emitCodeViewMagicVersion() {
375 OS.EmitValueToAlignment(4);
376 OS.AddComment("Debug section magic");
377 OS.EmitIntValue(COFF::DEBUG_SECTION_MAGIC, 4);
380 void CodeViewDebug::endModule() {
381 if (!Asm || !MMI->hasDebugInfo())
384 assert(Asm != nullptr);
386 // The COFF .debug$S section consists of several subsections, each starting
387 // with a 4-byte control code (e.g. 0xF1, 0xF2, etc) and then a 4-byte length
388 // of the payload followed by the payload itself. The subsections are 4-byte
391 // Use the generic .debug$S section, and make a subsection for all the inlined
393 switchToDebugSectionForSymbol(nullptr);
395 MCSymbol *CompilerInfo = beginCVSubsection(ModuleSubstreamKind::Symbols);
396 emitCompilerInformation();
397 endCVSubsection(CompilerInfo);
399 emitInlineeLinesSubsection();
401 // Emit per-function debug information.
402 for (auto &P : FnDebugInfo)
403 if (!P.first->isDeclarationForLinker())
404 emitDebugInfoForFunction(P.first, P.second);
406 // Emit global variable debug information.
407 setCurrentSubprogram(nullptr);
408 emitDebugInfoForGlobals();
410 // Emit retained types.
411 emitDebugInfoForRetainedTypes();
413 // Switch back to the generic .debug$S section after potentially processing
414 // comdat symbol sections.
415 switchToDebugSectionForSymbol(nullptr);
417 // Emit UDT records for any types used by global variables.
418 if (!GlobalUDTs.empty()) {
419 MCSymbol *SymbolsEnd = beginCVSubsection(ModuleSubstreamKind::Symbols);
420 emitDebugInfoForUDTs(GlobalUDTs);
421 endCVSubsection(SymbolsEnd);
424 // This subsection holds a file index to offset in string table table.
425 OS.AddComment("File index to string table offset subsection");
426 OS.EmitCVFileChecksumsDirective();
428 // This subsection holds the string table.
429 OS.AddComment("String table");
430 OS.EmitCVStringTableDirective();
432 // Emit type information last, so that any types we translate while emitting
433 // function info are included.
434 emitTypeInformation();
439 static void emitNullTerminatedSymbolName(MCStreamer &OS, StringRef S) {
440 // The maximum CV record length is 0xFF00. Most of the strings we emit appear
441 // after a fixed length portion of the record. The fixed length portion should
442 // always be less than 0xF00 (3840) bytes, so truncate the string so that the
443 // overall record size is less than the maximum allowed.
444 unsigned MaxFixedRecordLength = 0xF00;
445 SmallString<32> NullTerminatedString(
446 S.take_front(MaxRecordLength - MaxFixedRecordLength - 1));
447 NullTerminatedString.push_back('\0');
448 OS.EmitBytes(NullTerminatedString);
451 void CodeViewDebug::emitTypeInformation() {
452 // Do nothing if we have no debug info or if no non-trivial types were emitted
453 // to TypeTable during codegen.
454 NamedMDNode *CU_Nodes = MMI->getModule()->getNamedMetadata("llvm.dbg.cu");
457 if (TypeTable.empty())
460 // Start the .debug$T section with 0x4.
461 OS.SwitchSection(Asm->getObjFileLowering().getCOFFDebugTypesSection());
462 emitCodeViewMagicVersion();
464 SmallString<8> CommentPrefix;
465 if (OS.isVerboseAsm()) {
466 CommentPrefix += '\t';
467 CommentPrefix += Asm->MAI->getCommentString();
468 CommentPrefix += ' ';
472 CVTypeDumper CVTD(TypeDB);
473 TypeTable.ForEachRecord([&](TypeIndex Index, ArrayRef<uint8_t> Record) {
474 if (OS.isVerboseAsm()) {
475 // Emit a block comment describing the type record for readability.
476 SmallString<512> CommentBlock;
477 raw_svector_ostream CommentOS(CommentBlock);
478 ScopedPrinter SP(CommentOS);
479 SP.setPrefix(CommentPrefix);
480 TypeDumpVisitor TDV(TypeDB, &SP, false);
481 Error E = CVTD.dump(Record, TDV);
483 logAllUnhandledErrors(std::move(E), errs(), "error: ");
484 llvm_unreachable("produced malformed type record");
486 // emitRawComment will insert its own tab and comment string before
487 // the first line, so strip off our first one. It also prints its own
490 CommentOS.str().drop_front(CommentPrefix.size() - 1).rtrim());
493 // Assert that the type data is valid even if we aren't dumping
494 // comments. The MSVC linker doesn't do much type record validation,
495 // so the first link of an invalid type record can succeed while
496 // subsequent links will fail with LNK1285.
497 BinaryByteStream Stream(Record, llvm::support::little);
499 BinaryStreamReader Reader(Stream);
500 Error E = Reader.readArray(Types, Reader.getLength());
502 TypeVisitorCallbacks C;
503 E = CVTypeVisitor(C).visitTypeStream(Types);
506 logAllUnhandledErrors(std::move(E), errs(), "error: ");
507 llvm_unreachable("produced malformed type record");
511 StringRef S(reinterpret_cast<const char *>(Record.data()), Record.size());
512 OS.EmitBinaryData(S);
518 static SourceLanguage MapDWLangToCVLang(unsigned DWLang) {
520 case dwarf::DW_LANG_C:
521 case dwarf::DW_LANG_C89:
522 case dwarf::DW_LANG_C99:
523 case dwarf::DW_LANG_C11:
524 case dwarf::DW_LANG_ObjC:
525 return SourceLanguage::C;
526 case dwarf::DW_LANG_C_plus_plus:
527 case dwarf::DW_LANG_C_plus_plus_03:
528 case dwarf::DW_LANG_C_plus_plus_11:
529 case dwarf::DW_LANG_C_plus_plus_14:
530 return SourceLanguage::Cpp;
531 case dwarf::DW_LANG_Fortran77:
532 case dwarf::DW_LANG_Fortran90:
533 case dwarf::DW_LANG_Fortran03:
534 case dwarf::DW_LANG_Fortran08:
535 return SourceLanguage::Fortran;
536 case dwarf::DW_LANG_Pascal83:
537 return SourceLanguage::Pascal;
538 case dwarf::DW_LANG_Cobol74:
539 case dwarf::DW_LANG_Cobol85:
540 return SourceLanguage::Cobol;
541 case dwarf::DW_LANG_Java:
542 return SourceLanguage::Java;
544 // There's no CodeView representation for this language, and CV doesn't
545 // have an "unknown" option for the language field, so we'll use MASM,
546 // as it's very low level.
547 return SourceLanguage::Masm;
555 // Takes a StringRef like "clang 4.0.0.0 (other nonsense 123)" and parses out
556 // the version number.
557 static Version parseVersion(StringRef Name) {
560 for (const char C : Name) {
563 V.Part[N] += C - '0';
564 } else if (C == '.') {
574 static CPUType mapArchToCVCPUType(Triple::ArchType Type) {
576 case Triple::ArchType::x86:
577 return CPUType::Pentium3;
578 case Triple::ArchType::x86_64:
580 case Triple::ArchType::thumb:
581 return CPUType::Thumb;
583 report_fatal_error("target architecture doesn't map to a CodeView "
588 } // anonymous namespace
590 void CodeViewDebug::emitCompilerInformation() {
591 MCContext &Context = MMI->getContext();
592 MCSymbol *CompilerBegin = Context.createTempSymbol(),
593 *CompilerEnd = Context.createTempSymbol();
594 OS.AddComment("Record length");
595 OS.emitAbsoluteSymbolDiff(CompilerEnd, CompilerBegin, 2);
596 OS.EmitLabel(CompilerBegin);
597 OS.AddComment("Record kind: S_COMPILE3");
598 OS.EmitIntValue(SymbolKind::S_COMPILE3, 2);
601 NamedMDNode *CUs = MMI->getModule()->getNamedMetadata("llvm.dbg.cu");
602 const MDNode *Node = *CUs->operands().begin();
603 const auto *CU = cast<DICompileUnit>(Node);
605 // The low byte of the flags indicates the source language.
606 Flags = MapDWLangToCVLang(CU->getSourceLanguage());
607 // TODO: Figure out which other flags need to be set.
609 OS.AddComment("Flags and language");
610 OS.EmitIntValue(Flags, 4);
612 OS.AddComment("CPUType");
614 mapArchToCVCPUType(Triple(MMI->getModule()->getTargetTriple()).getArch());
615 OS.EmitIntValue(static_cast<uint64_t>(CPU), 2);
617 StringRef CompilerVersion = CU->getProducer();
618 Version FrontVer = parseVersion(CompilerVersion);
619 OS.AddComment("Frontend version");
620 for (int N = 0; N < 4; ++N)
621 OS.EmitIntValue(FrontVer.Part[N], 2);
623 // Some Microsoft tools, like Binscope, expect a backend version number of at
624 // least 8.something, so we'll coerce the LLVM version into a form that
625 // guarantees it'll be big enough without really lying about the version.
626 int Major = 1000 * LLVM_VERSION_MAJOR +
627 10 * LLVM_VERSION_MINOR +
629 // Clamp it for builds that use unusually large version numbers.
630 Major = std::min<int>(Major, std::numeric_limits<uint16_t>::max());
631 Version BackVer = {{ Major, 0, 0, 0 }};
632 OS.AddComment("Backend version");
633 for (int N = 0; N < 4; ++N)
634 OS.EmitIntValue(BackVer.Part[N], 2);
636 OS.AddComment("Null-terminated compiler version string");
637 emitNullTerminatedSymbolName(OS, CompilerVersion);
639 OS.EmitLabel(CompilerEnd);
642 void CodeViewDebug::emitInlineeLinesSubsection() {
643 if (InlinedSubprograms.empty())
646 OS.AddComment("Inlinee lines subsection");
647 MCSymbol *InlineEnd = beginCVSubsection(ModuleSubstreamKind::InlineeLines);
649 // We don't provide any extra file info.
650 // FIXME: Find out if debuggers use this info.
651 OS.AddComment("Inlinee lines signature");
652 OS.EmitIntValue(unsigned(InlineeLinesSignature::Normal), 4);
654 for (const DISubprogram *SP : InlinedSubprograms) {
655 assert(TypeIndices.count({SP, nullptr}));
656 TypeIndex InlineeIdx = TypeIndices[{SP, nullptr}];
659 unsigned FileId = maybeRecordFile(SP->getFile());
660 OS.AddComment("Inlined function " + SP->getDisplayName() + " starts at " +
661 SP->getFilename() + Twine(':') + Twine(SP->getLine()));
663 // The filechecksum table uses 8 byte entries for now, and file ids start at
665 unsigned FileOffset = (FileId - 1) * 8;
666 OS.AddComment("Type index of inlined function");
667 OS.EmitIntValue(InlineeIdx.getIndex(), 4);
668 OS.AddComment("Offset into filechecksum table");
669 OS.EmitIntValue(FileOffset, 4);
670 OS.AddComment("Starting line number");
671 OS.EmitIntValue(SP->getLine(), 4);
674 endCVSubsection(InlineEnd);
677 void CodeViewDebug::emitInlinedCallSite(const FunctionInfo &FI,
678 const DILocation *InlinedAt,
679 const InlineSite &Site) {
680 MCSymbol *InlineBegin = MMI->getContext().createTempSymbol(),
681 *InlineEnd = MMI->getContext().createTempSymbol();
683 assert(TypeIndices.count({Site.Inlinee, nullptr}));
684 TypeIndex InlineeIdx = TypeIndices[{Site.Inlinee, nullptr}];
687 OS.AddComment("Record length");
688 OS.emitAbsoluteSymbolDiff(InlineEnd, InlineBegin, 2); // RecordLength
689 OS.EmitLabel(InlineBegin);
690 OS.AddComment("Record kind: S_INLINESITE");
691 OS.EmitIntValue(SymbolKind::S_INLINESITE, 2); // RecordKind
693 OS.AddComment("PtrParent");
694 OS.EmitIntValue(0, 4);
695 OS.AddComment("PtrEnd");
696 OS.EmitIntValue(0, 4);
697 OS.AddComment("Inlinee type index");
698 OS.EmitIntValue(InlineeIdx.getIndex(), 4);
700 unsigned FileId = maybeRecordFile(Site.Inlinee->getFile());
701 unsigned StartLineNum = Site.Inlinee->getLine();
703 OS.EmitCVInlineLinetableDirective(Site.SiteFuncId, FileId, StartLineNum,
706 OS.EmitLabel(InlineEnd);
708 emitLocalVariableList(Site.InlinedLocals);
710 // Recurse on child inlined call sites before closing the scope.
711 for (const DILocation *ChildSite : Site.ChildSites) {
712 auto I = FI.InlineSites.find(ChildSite);
713 assert(I != FI.InlineSites.end() &&
714 "child site not in function inline site map");
715 emitInlinedCallSite(FI, ChildSite, I->second);
719 OS.AddComment("Record length");
720 OS.EmitIntValue(2, 2); // RecordLength
721 OS.AddComment("Record kind: S_INLINESITE_END");
722 OS.EmitIntValue(SymbolKind::S_INLINESITE_END, 2); // RecordKind
725 void CodeViewDebug::switchToDebugSectionForSymbol(const MCSymbol *GVSym) {
726 // If we have a symbol, it may be in a section that is COMDAT. If so, find the
727 // comdat key. A section may be comdat because of -ffunction-sections or
728 // because it is comdat in the IR.
729 MCSectionCOFF *GVSec =
730 GVSym ? dyn_cast<MCSectionCOFF>(&GVSym->getSection()) : nullptr;
731 const MCSymbol *KeySym = GVSec ? GVSec->getCOMDATSymbol() : nullptr;
733 MCSectionCOFF *DebugSec = cast<MCSectionCOFF>(
734 Asm->getObjFileLowering().getCOFFDebugSymbolsSection());
735 DebugSec = OS.getContext().getAssociativeCOFFSection(DebugSec, KeySym);
737 OS.SwitchSection(DebugSec);
739 // Emit the magic version number if this is the first time we've switched to
741 if (ComdatDebugSections.insert(DebugSec).second)
742 emitCodeViewMagicVersion();
745 void CodeViewDebug::emitDebugInfoForFunction(const Function *GV,
747 // For each function there is a separate subsection
748 // which holds the PC to file:line table.
749 const MCSymbol *Fn = Asm->getSymbol(GV);
752 // Switch to the to a comdat section, if appropriate.
753 switchToDebugSectionForSymbol(Fn);
755 std::string FuncName;
756 auto *SP = GV->getSubprogram();
758 setCurrentSubprogram(SP);
760 // If we have a display name, build the fully qualified name by walking the
762 if (!SP->getDisplayName().empty())
764 getFullyQualifiedName(SP->getScope().resolve(), SP->getDisplayName());
766 // If our DISubprogram name is empty, use the mangled name.
767 if (FuncName.empty())
768 FuncName = GlobalValue::getRealLinkageName(GV->getName());
770 // Emit a symbol subsection, required by VS2012+ to find function boundaries.
771 OS.AddComment("Symbol subsection for " + Twine(FuncName));
772 MCSymbol *SymbolsEnd = beginCVSubsection(ModuleSubstreamKind::Symbols);
774 MCSymbol *ProcRecordBegin = MMI->getContext().createTempSymbol(),
775 *ProcRecordEnd = MMI->getContext().createTempSymbol();
776 OS.AddComment("Record length");
777 OS.emitAbsoluteSymbolDiff(ProcRecordEnd, ProcRecordBegin, 2);
778 OS.EmitLabel(ProcRecordBegin);
780 if (GV->hasLocalLinkage()) {
781 OS.AddComment("Record kind: S_LPROC32_ID");
782 OS.EmitIntValue(unsigned(SymbolKind::S_LPROC32_ID), 2);
784 OS.AddComment("Record kind: S_GPROC32_ID");
785 OS.EmitIntValue(unsigned(SymbolKind::S_GPROC32_ID), 2);
788 // These fields are filled in by tools like CVPACK which run after the fact.
789 OS.AddComment("PtrParent");
790 OS.EmitIntValue(0, 4);
791 OS.AddComment("PtrEnd");
792 OS.EmitIntValue(0, 4);
793 OS.AddComment("PtrNext");
794 OS.EmitIntValue(0, 4);
795 // This is the important bit that tells the debugger where the function
796 // code is located and what's its size:
797 OS.AddComment("Code size");
798 OS.emitAbsoluteSymbolDiff(FI.End, Fn, 4);
799 OS.AddComment("Offset after prologue");
800 OS.EmitIntValue(0, 4);
801 OS.AddComment("Offset before epilogue");
802 OS.EmitIntValue(0, 4);
803 OS.AddComment("Function type index");
804 OS.EmitIntValue(getFuncIdForSubprogram(GV->getSubprogram()).getIndex(), 4);
805 OS.AddComment("Function section relative address");
806 OS.EmitCOFFSecRel32(Fn, /*Offset=*/0);
807 OS.AddComment("Function section index");
808 OS.EmitCOFFSectionIndex(Fn);
809 OS.AddComment("Flags");
810 OS.EmitIntValue(0, 1);
811 // Emit the function display name as a null-terminated string.
812 OS.AddComment("Function name");
813 // Truncate the name so we won't overflow the record length field.
814 emitNullTerminatedSymbolName(OS, FuncName);
815 OS.EmitLabel(ProcRecordEnd);
817 emitLocalVariableList(FI.Locals);
819 // Emit inlined call site information. Only emit functions inlined directly
820 // into the parent function. We'll emit the other sites recursively as part
821 // of their parent inline site.
822 for (const DILocation *InlinedAt : FI.ChildSites) {
823 auto I = FI.InlineSites.find(InlinedAt);
824 assert(I != FI.InlineSites.end() &&
825 "child site not in function inline site map");
826 emitInlinedCallSite(FI, InlinedAt, I->second);
830 emitDebugInfoForUDTs(LocalUDTs);
832 // We're done with this function.
833 OS.AddComment("Record length");
834 OS.EmitIntValue(0x0002, 2);
835 OS.AddComment("Record kind: S_PROC_ID_END");
836 OS.EmitIntValue(unsigned(SymbolKind::S_PROC_ID_END), 2);
838 endCVSubsection(SymbolsEnd);
840 // We have an assembler directive that takes care of the whole line table.
841 OS.EmitCVLinetableDirective(FI.FuncId, Fn, FI.End);
844 CodeViewDebug::LocalVarDefRange
845 CodeViewDebug::createDefRangeMem(uint16_t CVRegister, int Offset) {
848 DR.DataOffset = Offset;
849 assert(DR.DataOffset == Offset && "truncation");
852 DR.CVRegister = CVRegister;
856 CodeViewDebug::LocalVarDefRange
857 CodeViewDebug::createDefRangeGeneral(uint16_t CVRegister, bool InMemory,
858 int Offset, bool IsSubfield,
859 uint16_t StructOffset) {
861 DR.InMemory = InMemory;
862 DR.DataOffset = Offset;
863 DR.IsSubfield = IsSubfield;
864 DR.StructOffset = StructOffset;
865 DR.CVRegister = CVRegister;
869 void CodeViewDebug::collectVariableInfoFromMFTable(
870 DenseSet<InlinedVariable> &Processed) {
871 const MachineFunction &MF = *Asm->MF;
872 const TargetSubtargetInfo &TSI = MF.getSubtarget();
873 const TargetFrameLowering *TFI = TSI.getFrameLowering();
874 const TargetRegisterInfo *TRI = TSI.getRegisterInfo();
876 for (const MachineFunction::VariableDbgInfo &VI : MF.getVariableDbgInfo()) {
879 assert(VI.Var->isValidLocationForIntrinsic(VI.Loc) &&
880 "Expected inlined-at fields to agree");
882 Processed.insert(InlinedVariable(VI.Var, VI.Loc->getInlinedAt()));
883 LexicalScope *Scope = LScopes.findLexicalScope(VI.Loc);
885 // If variable scope is not found then skip this variable.
889 // Get the frame register used and the offset.
890 unsigned FrameReg = 0;
891 int FrameOffset = TFI->getFrameIndexReference(*Asm->MF, VI.Slot, FrameReg);
892 uint16_t CVReg = TRI->getCodeViewRegNum(FrameReg);
894 // Calculate the label ranges.
895 LocalVarDefRange DefRange = createDefRangeMem(CVReg, FrameOffset);
896 for (const InsnRange &Range : Scope->getRanges()) {
897 const MCSymbol *Begin = getLabelBeforeInsn(Range.first);
898 const MCSymbol *End = getLabelAfterInsn(Range.second);
899 End = End ? End : Asm->getFunctionEnd();
900 DefRange.Ranges.emplace_back(Begin, End);
905 Var.DefRanges.emplace_back(std::move(DefRange));
906 recordLocalVariable(std::move(Var), VI.Loc->getInlinedAt());
910 void CodeViewDebug::collectVariableInfo(const DISubprogram *SP) {
911 DenseSet<InlinedVariable> Processed;
912 // Grab the variable info that was squirreled away in the MMI side-table.
913 collectVariableInfoFromMFTable(Processed);
915 const TargetRegisterInfo *TRI = Asm->MF->getSubtarget().getRegisterInfo();
917 for (const auto &I : DbgValues) {
918 InlinedVariable IV = I.first;
919 if (Processed.count(IV))
921 const DILocalVariable *DIVar = IV.first;
922 const DILocation *InlinedAt = IV.second;
924 // Instruction ranges, specifying where IV is accessible.
925 const auto &Ranges = I.second;
927 LexicalScope *Scope = nullptr;
929 Scope = LScopes.findInlinedScope(DIVar->getScope(), InlinedAt);
931 Scope = LScopes.findLexicalScope(DIVar->getScope());
932 // If variable scope is not found then skip this variable.
939 // Calculate the definition ranges.
940 for (auto I = Ranges.begin(), E = Ranges.end(); I != E; ++I) {
941 const InsnRange &Range = *I;
942 const MachineInstr *DVInst = Range.first;
943 assert(DVInst->isDebugValue() && "Invalid History entry");
944 const DIExpression *DIExpr = DVInst->getDebugExpression();
945 bool IsSubfield = false;
946 unsigned StructOffset = 0;
949 auto Fragment = DIExpr->getFragmentInfo();
952 StructOffset = Fragment->OffsetInBits / 8;
953 } else if (DIExpr->getNumElements() > 0) {
954 continue; // Ignore unrecognized exprs.
957 // Bail if operand 0 is not a valid register. This means the variable is a
958 // simple constant, or is described by a complex expression.
959 // FIXME: Find a way to represent constant variables, since they are
960 // relatively common.
962 DVInst->getOperand(0).isReg() ? DVInst->getOperand(0).getReg() : 0;
966 // Handle the two cases we can handle: indirect in memory and in register.
967 unsigned CVReg = TRI->getCodeViewRegNum(Reg);
968 bool InMemory = DVInst->getOperand(1).isImm();
969 int Offset = InMemory ? DVInst->getOperand(1).getImm() : 0;
972 DR.CVRegister = CVReg;
973 DR.InMemory = InMemory;
974 DR.DataOffset = Offset;
975 DR.IsSubfield = IsSubfield;
976 DR.StructOffset = StructOffset;
978 if (Var.DefRanges.empty() ||
979 Var.DefRanges.back().isDifferentLocation(DR)) {
980 Var.DefRanges.emplace_back(std::move(DR));
984 // Compute the label range.
985 const MCSymbol *Begin = getLabelBeforeInsn(Range.first);
986 const MCSymbol *End = getLabelAfterInsn(Range.second);
988 // This range is valid until the next overlapping bitpiece. In the
989 // common case, ranges will not be bitpieces, so they will overlap.
990 auto J = std::next(I);
992 !fragmentsOverlap(DIExpr, J->first->getDebugExpression()))
995 End = getLabelBeforeInsn(J->first);
997 End = Asm->getFunctionEnd();
1000 // If the last range end is our begin, just extend the last range.
1001 // Otherwise make a new range.
1002 SmallVectorImpl<std::pair<const MCSymbol *, const MCSymbol *>> &Ranges =
1003 Var.DefRanges.back().Ranges;
1004 if (!Ranges.empty() && Ranges.back().second == Begin)
1005 Ranges.back().second = End;
1007 Ranges.emplace_back(Begin, End);
1009 // FIXME: Do more range combining.
1012 recordLocalVariable(std::move(Var), InlinedAt);
1016 void CodeViewDebug::beginFunctionImpl(const MachineFunction *MF) {
1017 const Function *GV = MF->getFunction();
1018 assert(FnDebugInfo.count(GV) == false);
1019 CurFn = &FnDebugInfo[GV];
1020 CurFn->FuncId = NextFuncId++;
1021 CurFn->Begin = Asm->getFunctionBegin();
1023 OS.EmitCVFuncIdDirective(CurFn->FuncId);
1025 // Find the end of the function prolog. First known non-DBG_VALUE and
1026 // non-frame setup location marks the beginning of the function body.
1027 // FIXME: is there a simpler a way to do this? Can we just search
1028 // for the first instruction of the function, not the last of the prolog?
1029 DebugLoc PrologEndLoc;
1030 bool EmptyPrologue = true;
1031 for (const auto &MBB : *MF) {
1032 for (const auto &MI : MBB) {
1033 if (!MI.isDebugValue() && !MI.getFlag(MachineInstr::FrameSetup) &&
1035 PrologEndLoc = MI.getDebugLoc();
1037 } else if (!MI.isDebugValue()) {
1038 EmptyPrologue = false;
1043 // Record beginning of function if we have a non-empty prologue.
1044 if (PrologEndLoc && !EmptyPrologue) {
1045 DebugLoc FnStartDL = PrologEndLoc.getFnDebugLoc();
1046 maybeRecordLocation(FnStartDL, MF);
1050 void CodeViewDebug::addToUDTs(const DIType *Ty, TypeIndex TI) {
1051 // Don't record empty UDTs.
1052 if (Ty->getName().empty())
1055 SmallVector<StringRef, 5> QualifiedNameComponents;
1056 const DISubprogram *ClosestSubprogram = getQualifiedNameComponents(
1057 Ty->getScope().resolve(), QualifiedNameComponents);
1059 std::string FullyQualifiedName =
1060 getQualifiedName(QualifiedNameComponents, getPrettyScopeName(Ty));
1062 if (ClosestSubprogram == nullptr)
1063 GlobalUDTs.emplace_back(std::move(FullyQualifiedName), TI);
1064 else if (ClosestSubprogram == CurrentSubprogram)
1065 LocalUDTs.emplace_back(std::move(FullyQualifiedName), TI);
1067 // TODO: What if the ClosestSubprogram is neither null or the current
1068 // subprogram? Currently, the UDT just gets dropped on the floor.
1070 // The current behavior is not desirable. To get maximal fidelity, we would
1071 // need to perform all type translation before beginning emission of .debug$S
1072 // and then make LocalUDTs a member of FunctionInfo
1075 TypeIndex CodeViewDebug::lowerType(const DIType *Ty, const DIType *ClassTy) {
1076 // Generic dispatch for lowering an unknown type.
1077 switch (Ty->getTag()) {
1078 case dwarf::DW_TAG_array_type:
1079 return lowerTypeArray(cast<DICompositeType>(Ty));
1080 case dwarf::DW_TAG_typedef:
1081 return lowerTypeAlias(cast<DIDerivedType>(Ty));
1082 case dwarf::DW_TAG_base_type:
1083 return lowerTypeBasic(cast<DIBasicType>(Ty));
1084 case dwarf::DW_TAG_pointer_type:
1085 if (cast<DIDerivedType>(Ty)->getName() == "__vtbl_ptr_type")
1086 return lowerTypeVFTableShape(cast<DIDerivedType>(Ty));
1088 case dwarf::DW_TAG_reference_type:
1089 case dwarf::DW_TAG_rvalue_reference_type:
1090 return lowerTypePointer(cast<DIDerivedType>(Ty));
1091 case dwarf::DW_TAG_ptr_to_member_type:
1092 return lowerTypeMemberPointer(cast<DIDerivedType>(Ty));
1093 case dwarf::DW_TAG_const_type:
1094 case dwarf::DW_TAG_volatile_type:
1095 // TODO: add support for DW_TAG_atomic_type here
1096 return lowerTypeModifier(cast<DIDerivedType>(Ty));
1097 case dwarf::DW_TAG_subroutine_type:
1099 // The member function type of a member function pointer has no
1101 return lowerTypeMemberFunction(cast<DISubroutineType>(Ty), ClassTy,
1102 /*ThisAdjustment=*/0);
1104 return lowerTypeFunction(cast<DISubroutineType>(Ty));
1105 case dwarf::DW_TAG_enumeration_type:
1106 return lowerTypeEnum(cast<DICompositeType>(Ty));
1107 case dwarf::DW_TAG_class_type:
1108 case dwarf::DW_TAG_structure_type:
1109 return lowerTypeClass(cast<DICompositeType>(Ty));
1110 case dwarf::DW_TAG_union_type:
1111 return lowerTypeUnion(cast<DICompositeType>(Ty));
1113 // Use the null type index.
1118 TypeIndex CodeViewDebug::lowerTypeAlias(const DIDerivedType *Ty) {
1119 DITypeRef UnderlyingTypeRef = Ty->getBaseType();
1120 TypeIndex UnderlyingTypeIndex = getTypeIndex(UnderlyingTypeRef);
1121 StringRef TypeName = Ty->getName();
1123 addToUDTs(Ty, UnderlyingTypeIndex);
1125 if (UnderlyingTypeIndex == TypeIndex(SimpleTypeKind::Int32Long) &&
1126 TypeName == "HRESULT")
1127 return TypeIndex(SimpleTypeKind::HResult);
1128 if (UnderlyingTypeIndex == TypeIndex(SimpleTypeKind::UInt16Short) &&
1129 TypeName == "wchar_t")
1130 return TypeIndex(SimpleTypeKind::WideCharacter);
1132 return UnderlyingTypeIndex;
1135 TypeIndex CodeViewDebug::lowerTypeArray(const DICompositeType *Ty) {
1136 DITypeRef ElementTypeRef = Ty->getBaseType();
1137 TypeIndex ElementTypeIndex = getTypeIndex(ElementTypeRef);
1138 // IndexType is size_t, which depends on the bitness of the target.
1139 TypeIndex IndexType = Asm->TM.getPointerSize() == 8
1140 ? TypeIndex(SimpleTypeKind::UInt64Quad)
1141 : TypeIndex(SimpleTypeKind::UInt32Long);
1143 uint64_t ElementSize = getBaseTypeSize(ElementTypeRef) / 8;
1145 // Add subranges to array type.
1146 DINodeArray Elements = Ty->getElements();
1147 for (int i = Elements.size() - 1; i >= 0; --i) {
1148 const DINode *Element = Elements[i];
1149 assert(Element->getTag() == dwarf::DW_TAG_subrange_type);
1151 const DISubrange *Subrange = cast<DISubrange>(Element);
1152 assert(Subrange->getLowerBound() == 0 &&
1153 "codeview doesn't support subranges with lower bounds");
1154 int64_t Count = Subrange->getCount();
1156 // Variable Length Array (VLA) has Count equal to '-1'.
1157 // Replace with Count '1', assume it is the minimum VLA length.
1158 // FIXME: Make front-end support VLA subrange and emit LF_DIMVARLU.
1162 // Update the element size and element type index for subsequent subranges.
1163 ElementSize *= Count;
1165 // If this is the outermost array, use the size from the array. It will be
1166 // more accurate if we had a VLA or an incomplete element type size.
1167 uint64_t ArraySize =
1168 (i == 0 && ElementSize == 0) ? Ty->getSizeInBits() / 8 : ElementSize;
1170 StringRef Name = (i == 0) ? Ty->getName() : "";
1171 ArrayRecord AR(ElementTypeIndex, IndexType, ArraySize, Name);
1172 ElementTypeIndex = TypeTable.writeKnownType(AR);
1175 return ElementTypeIndex;
1178 TypeIndex CodeViewDebug::lowerTypeBasic(const DIBasicType *Ty) {
1180 dwarf::TypeKind Kind;
1183 Kind = static_cast<dwarf::TypeKind>(Ty->getEncoding());
1184 ByteSize = Ty->getSizeInBits() / 8;
1186 SimpleTypeKind STK = SimpleTypeKind::None;
1188 case dwarf::DW_ATE_address:
1191 case dwarf::DW_ATE_boolean:
1193 case 1: STK = SimpleTypeKind::Boolean8; break;
1194 case 2: STK = SimpleTypeKind::Boolean16; break;
1195 case 4: STK = SimpleTypeKind::Boolean32; break;
1196 case 8: STK = SimpleTypeKind::Boolean64; break;
1197 case 16: STK = SimpleTypeKind::Boolean128; break;
1200 case dwarf::DW_ATE_complex_float:
1202 case 2: STK = SimpleTypeKind::Complex16; break;
1203 case 4: STK = SimpleTypeKind::Complex32; break;
1204 case 8: STK = SimpleTypeKind::Complex64; break;
1205 case 10: STK = SimpleTypeKind::Complex80; break;
1206 case 16: STK = SimpleTypeKind::Complex128; break;
1209 case dwarf::DW_ATE_float:
1211 case 2: STK = SimpleTypeKind::Float16; break;
1212 case 4: STK = SimpleTypeKind::Float32; break;
1213 case 6: STK = SimpleTypeKind::Float48; break;
1214 case 8: STK = SimpleTypeKind::Float64; break;
1215 case 10: STK = SimpleTypeKind::Float80; break;
1216 case 16: STK = SimpleTypeKind::Float128; break;
1219 case dwarf::DW_ATE_signed:
1221 case 1: STK = SimpleTypeKind::SignedCharacter; break;
1222 case 2: STK = SimpleTypeKind::Int16Short; break;
1223 case 4: STK = SimpleTypeKind::Int32; break;
1224 case 8: STK = SimpleTypeKind::Int64Quad; break;
1225 case 16: STK = SimpleTypeKind::Int128Oct; break;
1228 case dwarf::DW_ATE_unsigned:
1230 case 1: STK = SimpleTypeKind::UnsignedCharacter; break;
1231 case 2: STK = SimpleTypeKind::UInt16Short; break;
1232 case 4: STK = SimpleTypeKind::UInt32; break;
1233 case 8: STK = SimpleTypeKind::UInt64Quad; break;
1234 case 16: STK = SimpleTypeKind::UInt128Oct; break;
1237 case dwarf::DW_ATE_UTF:
1239 case 2: STK = SimpleTypeKind::Character16; break;
1240 case 4: STK = SimpleTypeKind::Character32; break;
1243 case dwarf::DW_ATE_signed_char:
1245 STK = SimpleTypeKind::SignedCharacter;
1247 case dwarf::DW_ATE_unsigned_char:
1249 STK = SimpleTypeKind::UnsignedCharacter;
1255 // Apply some fixups based on the source-level type name.
1256 if (STK == SimpleTypeKind::Int32 && Ty->getName() == "long int")
1257 STK = SimpleTypeKind::Int32Long;
1258 if (STK == SimpleTypeKind::UInt32 && Ty->getName() == "long unsigned int")
1259 STK = SimpleTypeKind::UInt32Long;
1260 if (STK == SimpleTypeKind::UInt16Short &&
1261 (Ty->getName() == "wchar_t" || Ty->getName() == "__wchar_t"))
1262 STK = SimpleTypeKind::WideCharacter;
1263 if ((STK == SimpleTypeKind::SignedCharacter ||
1264 STK == SimpleTypeKind::UnsignedCharacter) &&
1265 Ty->getName() == "char")
1266 STK = SimpleTypeKind::NarrowCharacter;
1268 return TypeIndex(STK);
1271 TypeIndex CodeViewDebug::lowerTypePointer(const DIDerivedType *Ty) {
1272 TypeIndex PointeeTI = getTypeIndex(Ty->getBaseType());
1274 // Pointers to simple types can use SimpleTypeMode, rather than having a
1275 // dedicated pointer type record.
1276 if (PointeeTI.isSimple() &&
1277 PointeeTI.getSimpleMode() == SimpleTypeMode::Direct &&
1278 Ty->getTag() == dwarf::DW_TAG_pointer_type) {
1279 SimpleTypeMode Mode = Ty->getSizeInBits() == 64
1280 ? SimpleTypeMode::NearPointer64
1281 : SimpleTypeMode::NearPointer32;
1282 return TypeIndex(PointeeTI.getSimpleKind(), Mode);
1286 Ty->getSizeInBits() == 64 ? PointerKind::Near64 : PointerKind::Near32;
1287 PointerMode PM = PointerMode::Pointer;
1288 switch (Ty->getTag()) {
1289 default: llvm_unreachable("not a pointer tag type");
1290 case dwarf::DW_TAG_pointer_type:
1291 PM = PointerMode::Pointer;
1293 case dwarf::DW_TAG_reference_type:
1294 PM = PointerMode::LValueReference;
1296 case dwarf::DW_TAG_rvalue_reference_type:
1297 PM = PointerMode::RValueReference;
1300 // FIXME: MSVC folds qualifiers into PointerOptions in the context of a method
1301 // 'this' pointer, but not normal contexts. Figure out what we're supposed to
1303 PointerOptions PO = PointerOptions::None;
1304 PointerRecord PR(PointeeTI, PK, PM, PO, Ty->getSizeInBits() / 8);
1305 return TypeTable.writeKnownType(PR);
1308 static PointerToMemberRepresentation
1309 translatePtrToMemberRep(unsigned SizeInBytes, bool IsPMF, unsigned Flags) {
1310 // SizeInBytes being zero generally implies that the member pointer type was
1311 // incomplete, which can happen if it is part of a function prototype. In this
1312 // case, use the unknown model instead of the general model.
1314 switch (Flags & DINode::FlagPtrToMemberRep) {
1316 return SizeInBytes == 0 ? PointerToMemberRepresentation::Unknown
1317 : PointerToMemberRepresentation::GeneralFunction;
1318 case DINode::FlagSingleInheritance:
1319 return PointerToMemberRepresentation::SingleInheritanceFunction;
1320 case DINode::FlagMultipleInheritance:
1321 return PointerToMemberRepresentation::MultipleInheritanceFunction;
1322 case DINode::FlagVirtualInheritance:
1323 return PointerToMemberRepresentation::VirtualInheritanceFunction;
1326 switch (Flags & DINode::FlagPtrToMemberRep) {
1328 return SizeInBytes == 0 ? PointerToMemberRepresentation::Unknown
1329 : PointerToMemberRepresentation::GeneralData;
1330 case DINode::FlagSingleInheritance:
1331 return PointerToMemberRepresentation::SingleInheritanceData;
1332 case DINode::FlagMultipleInheritance:
1333 return PointerToMemberRepresentation::MultipleInheritanceData;
1334 case DINode::FlagVirtualInheritance:
1335 return PointerToMemberRepresentation::VirtualInheritanceData;
1338 llvm_unreachable("invalid ptr to member representation");
1341 TypeIndex CodeViewDebug::lowerTypeMemberPointer(const DIDerivedType *Ty) {
1342 assert(Ty->getTag() == dwarf::DW_TAG_ptr_to_member_type);
1343 TypeIndex ClassTI = getTypeIndex(Ty->getClassType());
1344 TypeIndex PointeeTI = getTypeIndex(Ty->getBaseType(), Ty->getClassType());
1345 PointerKind PK = Asm->TM.getPointerSize() == 8 ? PointerKind::Near64
1346 : PointerKind::Near32;
1347 bool IsPMF = isa<DISubroutineType>(Ty->getBaseType());
1348 PointerMode PM = IsPMF ? PointerMode::PointerToMemberFunction
1349 : PointerMode::PointerToDataMember;
1350 PointerOptions PO = PointerOptions::None; // FIXME
1351 assert(Ty->getSizeInBits() / 8 <= 0xff && "pointer size too big");
1352 uint8_t SizeInBytes = Ty->getSizeInBits() / 8;
1353 MemberPointerInfo MPI(
1354 ClassTI, translatePtrToMemberRep(SizeInBytes, IsPMF, Ty->getFlags()));
1355 PointerRecord PR(PointeeTI, PK, PM, PO, SizeInBytes, MPI);
1356 return TypeTable.writeKnownType(PR);
1359 /// Given a DWARF calling convention, get the CodeView equivalent. If we don't
1360 /// have a translation, use the NearC convention.
1361 static CallingConvention dwarfCCToCodeView(unsigned DwarfCC) {
1363 case dwarf::DW_CC_normal: return CallingConvention::NearC;
1364 case dwarf::DW_CC_BORLAND_msfastcall: return CallingConvention::NearFast;
1365 case dwarf::DW_CC_BORLAND_thiscall: return CallingConvention::ThisCall;
1366 case dwarf::DW_CC_BORLAND_stdcall: return CallingConvention::NearStdCall;
1367 case dwarf::DW_CC_BORLAND_pascal: return CallingConvention::NearPascal;
1368 case dwarf::DW_CC_LLVM_vectorcall: return CallingConvention::NearVector;
1370 return CallingConvention::NearC;
1373 TypeIndex CodeViewDebug::lowerTypeModifier(const DIDerivedType *Ty) {
1374 ModifierOptions Mods = ModifierOptions::None;
1375 bool IsModifier = true;
1376 const DIType *BaseTy = Ty;
1377 while (IsModifier && BaseTy) {
1378 // FIXME: Need to add DWARF tags for __unaligned and _Atomic
1379 switch (BaseTy->getTag()) {
1380 case dwarf::DW_TAG_const_type:
1381 Mods |= ModifierOptions::Const;
1383 case dwarf::DW_TAG_volatile_type:
1384 Mods |= ModifierOptions::Volatile;
1391 BaseTy = cast<DIDerivedType>(BaseTy)->getBaseType().resolve();
1393 TypeIndex ModifiedTI = getTypeIndex(BaseTy);
1394 ModifierRecord MR(ModifiedTI, Mods);
1395 return TypeTable.writeKnownType(MR);
1398 TypeIndex CodeViewDebug::lowerTypeFunction(const DISubroutineType *Ty) {
1399 SmallVector<TypeIndex, 8> ReturnAndArgTypeIndices;
1400 for (DITypeRef ArgTypeRef : Ty->getTypeArray())
1401 ReturnAndArgTypeIndices.push_back(getTypeIndex(ArgTypeRef));
1403 TypeIndex ReturnTypeIndex = TypeIndex::Void();
1404 ArrayRef<TypeIndex> ArgTypeIndices = None;
1405 if (!ReturnAndArgTypeIndices.empty()) {
1406 auto ReturnAndArgTypesRef = makeArrayRef(ReturnAndArgTypeIndices);
1407 ReturnTypeIndex = ReturnAndArgTypesRef.front();
1408 ArgTypeIndices = ReturnAndArgTypesRef.drop_front();
1411 ArgListRecord ArgListRec(TypeRecordKind::ArgList, ArgTypeIndices);
1412 TypeIndex ArgListIndex = TypeTable.writeKnownType(ArgListRec);
1414 CallingConvention CC = dwarfCCToCodeView(Ty->getCC());
1416 ProcedureRecord Procedure(ReturnTypeIndex, CC, FunctionOptions::None,
1417 ArgTypeIndices.size(), ArgListIndex);
1418 return TypeTable.writeKnownType(Procedure);
1421 TypeIndex CodeViewDebug::lowerTypeMemberFunction(const DISubroutineType *Ty,
1422 const DIType *ClassTy,
1423 int ThisAdjustment) {
1424 // Lower the containing class type.
1425 TypeIndex ClassType = getTypeIndex(ClassTy);
1427 SmallVector<TypeIndex, 8> ReturnAndArgTypeIndices;
1428 for (DITypeRef ArgTypeRef : Ty->getTypeArray())
1429 ReturnAndArgTypeIndices.push_back(getTypeIndex(ArgTypeRef));
1431 TypeIndex ReturnTypeIndex = TypeIndex::Void();
1432 ArrayRef<TypeIndex> ArgTypeIndices = None;
1433 if (!ReturnAndArgTypeIndices.empty()) {
1434 auto ReturnAndArgTypesRef = makeArrayRef(ReturnAndArgTypeIndices);
1435 ReturnTypeIndex = ReturnAndArgTypesRef.front();
1436 ArgTypeIndices = ReturnAndArgTypesRef.drop_front();
1438 TypeIndex ThisTypeIndex = TypeIndex::Void();
1439 if (!ArgTypeIndices.empty()) {
1440 ThisTypeIndex = ArgTypeIndices.front();
1441 ArgTypeIndices = ArgTypeIndices.drop_front();
1444 ArgListRecord ArgListRec(TypeRecordKind::ArgList, ArgTypeIndices);
1445 TypeIndex ArgListIndex = TypeTable.writeKnownType(ArgListRec);
1447 CallingConvention CC = dwarfCCToCodeView(Ty->getCC());
1449 // TODO: Need to use the correct values for:
1451 // ThisPointerAdjustment.
1452 MemberFunctionRecord MFR(ReturnTypeIndex, ClassType, ThisTypeIndex, CC,
1453 FunctionOptions::None, ArgTypeIndices.size(),
1454 ArgListIndex, ThisAdjustment);
1455 TypeIndex TI = TypeTable.writeKnownType(MFR);
1460 TypeIndex CodeViewDebug::lowerTypeVFTableShape(const DIDerivedType *Ty) {
1461 unsigned VSlotCount =
1462 Ty->getSizeInBits() / (8 * Asm->MAI->getCodePointerSize());
1463 SmallVector<VFTableSlotKind, 4> Slots(VSlotCount, VFTableSlotKind::Near);
1465 VFTableShapeRecord VFTSR(Slots);
1466 return TypeTable.writeKnownType(VFTSR);
1469 static MemberAccess translateAccessFlags(unsigned RecordTag, unsigned Flags) {
1470 switch (Flags & DINode::FlagAccessibility) {
1471 case DINode::FlagPrivate: return MemberAccess::Private;
1472 case DINode::FlagPublic: return MemberAccess::Public;
1473 case DINode::FlagProtected: return MemberAccess::Protected;
1475 // If there was no explicit access control, provide the default for the tag.
1476 return RecordTag == dwarf::DW_TAG_class_type ? MemberAccess::Private
1477 : MemberAccess::Public;
1479 llvm_unreachable("access flags are exclusive");
1482 static MethodOptions translateMethodOptionFlags(const DISubprogram *SP) {
1483 if (SP->isArtificial())
1484 return MethodOptions::CompilerGenerated;
1486 // FIXME: Handle other MethodOptions.
1488 return MethodOptions::None;
1491 static MethodKind translateMethodKindFlags(const DISubprogram *SP,
1493 switch (SP->getVirtuality()) {
1494 case dwarf::DW_VIRTUALITY_none:
1496 case dwarf::DW_VIRTUALITY_virtual:
1497 return Introduced ? MethodKind::IntroducingVirtual : MethodKind::Virtual;
1498 case dwarf::DW_VIRTUALITY_pure_virtual:
1499 return Introduced ? MethodKind::PureIntroducingVirtual
1500 : MethodKind::PureVirtual;
1502 llvm_unreachable("unhandled virtuality case");
1505 // FIXME: Get Clang to mark DISubprogram as static and do something with it.
1507 return MethodKind::Vanilla;
1510 static TypeRecordKind getRecordKind(const DICompositeType *Ty) {
1511 switch (Ty->getTag()) {
1512 case dwarf::DW_TAG_class_type: return TypeRecordKind::Class;
1513 case dwarf::DW_TAG_structure_type: return TypeRecordKind::Struct;
1515 llvm_unreachable("unexpected tag");
1518 /// Return ClassOptions that should be present on both the forward declaration
1519 /// and the defintion of a tag type.
1520 static ClassOptions getCommonClassOptions(const DICompositeType *Ty) {
1521 ClassOptions CO = ClassOptions::None;
1523 // MSVC always sets this flag, even for local types. Clang doesn't always
1524 // appear to give every type a linkage name, which may be problematic for us.
1525 // FIXME: Investigate the consequences of not following them here.
1526 if (!Ty->getIdentifier().empty())
1527 CO |= ClassOptions::HasUniqueName;
1529 // Put the Nested flag on a type if it appears immediately inside a tag type.
1530 // Do not walk the scope chain. Do not attempt to compute ContainsNestedClass
1531 // here. That flag is only set on definitions, and not forward declarations.
1532 const DIScope *ImmediateScope = Ty->getScope().resolve();
1533 if (ImmediateScope && isa<DICompositeType>(ImmediateScope))
1534 CO |= ClassOptions::Nested;
1536 // Put the Scoped flag on function-local types.
1537 for (const DIScope *Scope = ImmediateScope; Scope != nullptr;
1538 Scope = Scope->getScope().resolve()) {
1539 if (isa<DISubprogram>(Scope)) {
1540 CO |= ClassOptions::Scoped;
1548 TypeIndex CodeViewDebug::lowerTypeEnum(const DICompositeType *Ty) {
1549 ClassOptions CO = getCommonClassOptions(Ty);
1551 unsigned EnumeratorCount = 0;
1553 if (Ty->isForwardDecl()) {
1554 CO |= ClassOptions::ForwardReference;
1556 FieldListRecordBuilder FLRB(TypeTable);
1559 for (const DINode *Element : Ty->getElements()) {
1560 // We assume that the frontend provides all members in source declaration
1561 // order, which is what MSVC does.
1562 if (auto *Enumerator = dyn_cast_or_null<DIEnumerator>(Element)) {
1563 EnumeratorRecord ER(MemberAccess::Public,
1564 APSInt::getUnsigned(Enumerator->getValue()),
1565 Enumerator->getName());
1566 FLRB.writeMemberType(ER);
1573 std::string FullName = getFullyQualifiedName(Ty);
1575 EnumRecord ER(EnumeratorCount, CO, FTI, FullName, Ty->getIdentifier(),
1576 getTypeIndex(Ty->getBaseType()));
1577 return TypeTable.writeKnownType(ER);
1580 //===----------------------------------------------------------------------===//
1582 //===----------------------------------------------------------------------===//
1584 struct llvm::ClassInfo {
1586 const DIDerivedType *MemberTypeNode;
1587 uint64_t BaseOffset;
1590 typedef std::vector<MemberInfo> MemberList;
1592 typedef TinyPtrVector<const DISubprogram *> MethodsList;
1593 // MethodName -> MethodsList
1594 typedef MapVector<MDString *, MethodsList> MethodsMap;
1597 std::vector<const DIDerivedType *> Inheritance;
1601 // Direct overloaded methods gathered by name.
1606 std::vector<const DICompositeType *> NestedClasses;
1609 void CodeViewDebug::clear() {
1610 assert(CurFn == nullptr);
1612 FnDebugInfo.clear();
1613 FileToFilepathMap.clear();
1616 TypeIndices.clear();
1617 CompleteTypeIndices.clear();
1620 void CodeViewDebug::collectMemberInfo(ClassInfo &Info,
1621 const DIDerivedType *DDTy) {
1622 if (!DDTy->getName().empty()) {
1623 Info.Members.push_back({DDTy, 0});
1626 // An unnamed member must represent a nested struct or union. Add all the
1627 // indirect fields to the current record.
1628 assert((DDTy->getOffsetInBits() % 8) == 0 && "Unnamed bitfield member!");
1629 uint64_t Offset = DDTy->getOffsetInBits();
1630 const DIType *Ty = DDTy->getBaseType().resolve();
1631 const DICompositeType *DCTy = cast<DICompositeType>(Ty);
1632 ClassInfo NestedInfo = collectClassInfo(DCTy);
1633 for (const ClassInfo::MemberInfo &IndirectField : NestedInfo.Members)
1634 Info.Members.push_back(
1635 {IndirectField.MemberTypeNode, IndirectField.BaseOffset + Offset});
1638 ClassInfo CodeViewDebug::collectClassInfo(const DICompositeType *Ty) {
1640 // Add elements to structure type.
1641 DINodeArray Elements = Ty->getElements();
1642 for (auto *Element : Elements) {
1643 // We assume that the frontend provides all members in source declaration
1644 // order, which is what MSVC does.
1647 if (auto *SP = dyn_cast<DISubprogram>(Element)) {
1648 Info.Methods[SP->getRawName()].push_back(SP);
1649 } else if (auto *DDTy = dyn_cast<DIDerivedType>(Element)) {
1650 if (DDTy->getTag() == dwarf::DW_TAG_member) {
1651 collectMemberInfo(Info, DDTy);
1652 } else if (DDTy->getTag() == dwarf::DW_TAG_inheritance) {
1653 Info.Inheritance.push_back(DDTy);
1654 } else if (DDTy->getTag() == dwarf::DW_TAG_pointer_type &&
1655 DDTy->getName() == "__vtbl_ptr_type") {
1656 Info.VShapeTI = getTypeIndex(DDTy);
1657 } else if (DDTy->getTag() == dwarf::DW_TAG_friend) {
1658 // Ignore friend members. It appears that MSVC emitted info about
1659 // friends in the past, but modern versions do not.
1661 } else if (auto *Composite = dyn_cast<DICompositeType>(Element)) {
1662 Info.NestedClasses.push_back(Composite);
1664 // Skip other unrecognized kinds of elements.
1669 TypeIndex CodeViewDebug::lowerTypeClass(const DICompositeType *Ty) {
1670 // First, construct the forward decl. Don't look into Ty to compute the
1671 // forward decl options, since it might not be available in all TUs.
1672 TypeRecordKind Kind = getRecordKind(Ty);
1674 ClassOptions::ForwardReference | getCommonClassOptions(Ty);
1675 std::string FullName = getFullyQualifiedName(Ty);
1676 ClassRecord CR(Kind, 0, CO, TypeIndex(), TypeIndex(), TypeIndex(), 0,
1677 FullName, Ty->getIdentifier());
1678 TypeIndex FwdDeclTI = TypeTable.writeKnownType(CR);
1679 if (!Ty->isForwardDecl())
1680 DeferredCompleteTypes.push_back(Ty);
1684 TypeIndex CodeViewDebug::lowerCompleteTypeClass(const DICompositeType *Ty) {
1685 // Construct the field list and complete type record.
1686 TypeRecordKind Kind = getRecordKind(Ty);
1687 ClassOptions CO = getCommonClassOptions(Ty);
1690 unsigned FieldCount;
1691 bool ContainsNestedClass;
1692 std::tie(FieldTI, VShapeTI, FieldCount, ContainsNestedClass) =
1693 lowerRecordFieldList(Ty);
1695 if (ContainsNestedClass)
1696 CO |= ClassOptions::ContainsNestedClass;
1698 std::string FullName = getFullyQualifiedName(Ty);
1700 uint64_t SizeInBytes = Ty->getSizeInBits() / 8;
1702 ClassRecord CR(Kind, FieldCount, CO, FieldTI, TypeIndex(), VShapeTI,
1703 SizeInBytes, FullName, Ty->getIdentifier());
1704 TypeIndex ClassTI = TypeTable.writeKnownType(CR);
1706 StringIdRecord SIDR(TypeIndex(0x0), getFullFilepath(Ty->getFile()));
1707 TypeIndex SIDI = TypeTable.writeKnownType(SIDR);
1708 UdtSourceLineRecord USLR(ClassTI, SIDI, Ty->getLine());
1709 TypeTable.writeKnownType(USLR);
1711 addToUDTs(Ty, ClassTI);
1716 TypeIndex CodeViewDebug::lowerTypeUnion(const DICompositeType *Ty) {
1718 ClassOptions::ForwardReference | getCommonClassOptions(Ty);
1719 std::string FullName = getFullyQualifiedName(Ty);
1720 UnionRecord UR(0, CO, TypeIndex(), 0, FullName, Ty->getIdentifier());
1721 TypeIndex FwdDeclTI = TypeTable.writeKnownType(UR);
1722 if (!Ty->isForwardDecl())
1723 DeferredCompleteTypes.push_back(Ty);
1727 TypeIndex CodeViewDebug::lowerCompleteTypeUnion(const DICompositeType *Ty) {
1728 ClassOptions CO = ClassOptions::Sealed | getCommonClassOptions(Ty);
1730 unsigned FieldCount;
1731 bool ContainsNestedClass;
1732 std::tie(FieldTI, std::ignore, FieldCount, ContainsNestedClass) =
1733 lowerRecordFieldList(Ty);
1735 if (ContainsNestedClass)
1736 CO |= ClassOptions::ContainsNestedClass;
1738 uint64_t SizeInBytes = Ty->getSizeInBits() / 8;
1739 std::string FullName = getFullyQualifiedName(Ty);
1741 UnionRecord UR(FieldCount, CO, FieldTI, SizeInBytes, FullName,
1742 Ty->getIdentifier());
1743 TypeIndex UnionTI = TypeTable.writeKnownType(UR);
1745 StringIdRecord SIR(TypeIndex(0x0), getFullFilepath(Ty->getFile()));
1746 TypeIndex SIRI = TypeTable.writeKnownType(SIR);
1747 UdtSourceLineRecord USLR(UnionTI, SIRI, Ty->getLine());
1748 TypeTable.writeKnownType(USLR);
1750 addToUDTs(Ty, UnionTI);
1755 std::tuple<TypeIndex, TypeIndex, unsigned, bool>
1756 CodeViewDebug::lowerRecordFieldList(const DICompositeType *Ty) {
1757 // Manually count members. MSVC appears to count everything that generates a
1758 // field list record. Each individual overload in a method overload group
1759 // contributes to this count, even though the overload group is a single field
1761 unsigned MemberCount = 0;
1762 ClassInfo Info = collectClassInfo(Ty);
1763 FieldListRecordBuilder FLBR(TypeTable);
1766 // Create base classes.
1767 for (const DIDerivedType *I : Info.Inheritance) {
1768 if (I->getFlags() & DINode::FlagVirtual) {
1770 // FIXME: Emit VBPtrOffset when the frontend provides it.
1771 unsigned VBPtrOffset = 0;
1772 // FIXME: Despite the accessor name, the offset is really in bytes.
1773 unsigned VBTableIndex = I->getOffsetInBits() / 4;
1774 auto RecordKind = (I->getFlags() & DINode::FlagIndirectVirtualBase) == DINode::FlagIndirectVirtualBase
1775 ? TypeRecordKind::IndirectVirtualBaseClass
1776 : TypeRecordKind::VirtualBaseClass;
1777 VirtualBaseClassRecord VBCR(
1778 RecordKind, translateAccessFlags(Ty->getTag(), I->getFlags()),
1779 getTypeIndex(I->getBaseType()), getVBPTypeIndex(), VBPtrOffset,
1782 FLBR.writeMemberType(VBCR);
1784 assert(I->getOffsetInBits() % 8 == 0 &&
1785 "bases must be on byte boundaries");
1786 BaseClassRecord BCR(translateAccessFlags(Ty->getTag(), I->getFlags()),
1787 getTypeIndex(I->getBaseType()),
1788 I->getOffsetInBits() / 8);
1789 FLBR.writeMemberType(BCR);
1794 for (ClassInfo::MemberInfo &MemberInfo : Info.Members) {
1795 const DIDerivedType *Member = MemberInfo.MemberTypeNode;
1796 TypeIndex MemberBaseType = getTypeIndex(Member->getBaseType());
1797 StringRef MemberName = Member->getName();
1798 MemberAccess Access =
1799 translateAccessFlags(Ty->getTag(), Member->getFlags());
1801 if (Member->isStaticMember()) {
1802 StaticDataMemberRecord SDMR(Access, MemberBaseType, MemberName);
1803 FLBR.writeMemberType(SDMR);
1808 // Virtual function pointer member.
1809 if ((Member->getFlags() & DINode::FlagArtificial) &&
1810 Member->getName().startswith("_vptr$")) {
1811 VFPtrRecord VFPR(getTypeIndex(Member->getBaseType()));
1812 FLBR.writeMemberType(VFPR);
1818 uint64_t MemberOffsetInBits =
1819 Member->getOffsetInBits() + MemberInfo.BaseOffset;
1820 if (Member->isBitField()) {
1821 uint64_t StartBitOffset = MemberOffsetInBits;
1822 if (const auto *CI =
1823 dyn_cast_or_null<ConstantInt>(Member->getStorageOffsetInBits())) {
1824 MemberOffsetInBits = CI->getZExtValue() + MemberInfo.BaseOffset;
1826 StartBitOffset -= MemberOffsetInBits;
1827 BitFieldRecord BFR(MemberBaseType, Member->getSizeInBits(),
1829 MemberBaseType = TypeTable.writeKnownType(BFR);
1831 uint64_t MemberOffsetInBytes = MemberOffsetInBits / 8;
1832 DataMemberRecord DMR(Access, MemberBaseType, MemberOffsetInBytes,
1834 FLBR.writeMemberType(DMR);
1839 for (auto &MethodItr : Info.Methods) {
1840 StringRef Name = MethodItr.first->getString();
1842 std::vector<OneMethodRecord> Methods;
1843 for (const DISubprogram *SP : MethodItr.second) {
1844 TypeIndex MethodType = getMemberFunctionType(SP, Ty);
1845 bool Introduced = SP->getFlags() & DINode::FlagIntroducedVirtual;
1847 unsigned VFTableOffset = -1;
1849 VFTableOffset = SP->getVirtualIndex() * getPointerSizeInBytes();
1851 Methods.push_back(OneMethodRecord(
1852 MethodType, translateAccessFlags(Ty->getTag(), SP->getFlags()),
1853 translateMethodKindFlags(SP, Introduced),
1854 translateMethodOptionFlags(SP), VFTableOffset, Name));
1857 assert(Methods.size() > 0 && "Empty methods map entry");
1858 if (Methods.size() == 1)
1859 FLBR.writeMemberType(Methods[0]);
1861 MethodOverloadListRecord MOLR(Methods);
1862 TypeIndex MethodList = TypeTable.writeKnownType(MOLR);
1863 OverloadedMethodRecord OMR(Methods.size(), MethodList, Name);
1864 FLBR.writeMemberType(OMR);
1868 // Create nested classes.
1869 for (const DICompositeType *Nested : Info.NestedClasses) {
1870 NestedTypeRecord R(getTypeIndex(DITypeRef(Nested)), Nested->getName());
1871 FLBR.writeMemberType(R);
1875 TypeIndex FieldTI = FLBR.end();
1876 return std::make_tuple(FieldTI, Info.VShapeTI, MemberCount,
1877 !Info.NestedClasses.empty());
1880 TypeIndex CodeViewDebug::getVBPTypeIndex() {
1881 if (!VBPType.getIndex()) {
1882 // Make a 'const int *' type.
1883 ModifierRecord MR(TypeIndex::Int32(), ModifierOptions::Const);
1884 TypeIndex ModifiedTI = TypeTable.writeKnownType(MR);
1886 PointerKind PK = getPointerSizeInBytes() == 8 ? PointerKind::Near64
1887 : PointerKind::Near32;
1888 PointerMode PM = PointerMode::Pointer;
1889 PointerOptions PO = PointerOptions::None;
1890 PointerRecord PR(ModifiedTI, PK, PM, PO, getPointerSizeInBytes());
1892 VBPType = TypeTable.writeKnownType(PR);
1898 TypeIndex CodeViewDebug::getTypeIndex(DITypeRef TypeRef, DITypeRef ClassTyRef) {
1899 const DIType *Ty = TypeRef.resolve();
1900 const DIType *ClassTy = ClassTyRef.resolve();
1902 // The null DIType is the void type. Don't try to hash it.
1904 return TypeIndex::Void();
1906 // Check if we've already translated this type. Don't try to do a
1907 // get-or-create style insertion that caches the hash lookup across the
1908 // lowerType call. It will update the TypeIndices map.
1909 auto I = TypeIndices.find({Ty, ClassTy});
1910 if (I != TypeIndices.end())
1913 TypeLoweringScope S(*this);
1914 TypeIndex TI = lowerType(Ty, ClassTy);
1915 return recordTypeIndexForDINode(Ty, TI, ClassTy);
1918 TypeIndex CodeViewDebug::getCompleteTypeIndex(DITypeRef TypeRef) {
1919 const DIType *Ty = TypeRef.resolve();
1921 // The null DIType is the void type. Don't try to hash it.
1923 return TypeIndex::Void();
1925 // If this is a non-record type, the complete type index is the same as the
1926 // normal type index. Just call getTypeIndex.
1927 switch (Ty->getTag()) {
1928 case dwarf::DW_TAG_class_type:
1929 case dwarf::DW_TAG_structure_type:
1930 case dwarf::DW_TAG_union_type:
1933 return getTypeIndex(Ty);
1936 // Check if we've already translated the complete record type. Lowering a
1937 // complete type should never trigger lowering another complete type, so we
1938 // can reuse the hash table lookup result.
1939 const auto *CTy = cast<DICompositeType>(Ty);
1940 auto InsertResult = CompleteTypeIndices.insert({CTy, TypeIndex()});
1941 if (!InsertResult.second)
1942 return InsertResult.first->second;
1944 TypeLoweringScope S(*this);
1946 // Make sure the forward declaration is emitted first. It's unclear if this
1947 // is necessary, but MSVC does it, and we should follow suit until we can show
1949 TypeIndex FwdDeclTI = getTypeIndex(CTy);
1951 // Just use the forward decl if we don't have complete type info. This might
1952 // happen if the frontend is using modules and expects the complete definition
1953 // to be emitted elsewhere.
1954 if (CTy->isForwardDecl())
1958 switch (CTy->getTag()) {
1959 case dwarf::DW_TAG_class_type:
1960 case dwarf::DW_TAG_structure_type:
1961 TI = lowerCompleteTypeClass(CTy);
1963 case dwarf::DW_TAG_union_type:
1964 TI = lowerCompleteTypeUnion(CTy);
1967 llvm_unreachable("not a record");
1970 InsertResult.first->second = TI;
1974 /// Emit all the deferred complete record types. Try to do this in FIFO order,
1975 /// and do this until fixpoint, as each complete record type typically
1977 /// many other record types.
1978 void CodeViewDebug::emitDeferredCompleteTypes() {
1979 SmallVector<const DICompositeType *, 4> TypesToEmit;
1980 while (!DeferredCompleteTypes.empty()) {
1981 std::swap(DeferredCompleteTypes, TypesToEmit);
1982 for (const DICompositeType *RecordTy : TypesToEmit)
1983 getCompleteTypeIndex(RecordTy);
1984 TypesToEmit.clear();
1988 void CodeViewDebug::emitLocalVariableList(ArrayRef<LocalVariable> Locals) {
1989 // Get the sorted list of parameters and emit them first.
1990 SmallVector<const LocalVariable *, 6> Params;
1991 for (const LocalVariable &L : Locals)
1992 if (L.DIVar->isParameter())
1993 Params.push_back(&L);
1994 std::sort(Params.begin(), Params.end(),
1995 [](const LocalVariable *L, const LocalVariable *R) {
1996 return L->DIVar->getArg() < R->DIVar->getArg();
1998 for (const LocalVariable *L : Params)
1999 emitLocalVariable(*L);
2001 // Next emit all non-parameters in the order that we found them.
2002 for (const LocalVariable &L : Locals)
2003 if (!L.DIVar->isParameter())
2004 emitLocalVariable(L);
2007 void CodeViewDebug::emitLocalVariable(const LocalVariable &Var) {
2008 // LocalSym record, see SymbolRecord.h for more info.
2009 MCSymbol *LocalBegin = MMI->getContext().createTempSymbol(),
2010 *LocalEnd = MMI->getContext().createTempSymbol();
2011 OS.AddComment("Record length");
2012 OS.emitAbsoluteSymbolDiff(LocalEnd, LocalBegin, 2);
2013 OS.EmitLabel(LocalBegin);
2015 OS.AddComment("Record kind: S_LOCAL");
2016 OS.EmitIntValue(unsigned(SymbolKind::S_LOCAL), 2);
2018 LocalSymFlags Flags = LocalSymFlags::None;
2019 if (Var.DIVar->isParameter())
2020 Flags |= LocalSymFlags::IsParameter;
2021 if (Var.DefRanges.empty())
2022 Flags |= LocalSymFlags::IsOptimizedOut;
2024 OS.AddComment("TypeIndex");
2025 TypeIndex TI = getCompleteTypeIndex(Var.DIVar->getType());
2026 OS.EmitIntValue(TI.getIndex(), 4);
2027 OS.AddComment("Flags");
2028 OS.EmitIntValue(static_cast<uint16_t>(Flags), 2);
2029 // Truncate the name so we won't overflow the record length field.
2030 emitNullTerminatedSymbolName(OS, Var.DIVar->getName());
2031 OS.EmitLabel(LocalEnd);
2033 // Calculate the on disk prefix of the appropriate def range record. The
2034 // records and on disk formats are described in SymbolRecords.h. BytePrefix
2035 // should be big enough to hold all forms without memory allocation.
2036 SmallString<20> BytePrefix;
2037 for (const LocalVarDefRange &DefRange : Var.DefRanges) {
2039 if (DefRange.InMemory) {
2040 uint16_t RegRelFlags = 0;
2041 if (DefRange.IsSubfield) {
2042 RegRelFlags = DefRangeRegisterRelSym::IsSubfieldFlag |
2043 (DefRange.StructOffset
2044 << DefRangeRegisterRelSym::OffsetInParentShift);
2046 DefRangeRegisterRelSym Sym(S_DEFRANGE_REGISTER_REL);
2047 Sym.Hdr.Register = DefRange.CVRegister;
2048 Sym.Hdr.Flags = RegRelFlags;
2049 Sym.Hdr.BasePointerOffset = DefRange.DataOffset;
2050 ulittle16_t SymKind = ulittle16_t(S_DEFRANGE_REGISTER_REL);
2052 StringRef(reinterpret_cast<const char *>(&SymKind), sizeof(SymKind));
2054 StringRef(reinterpret_cast<const char *>(&Sym.Hdr), sizeof(Sym.Hdr));
2056 assert(DefRange.DataOffset == 0 && "unexpected offset into register");
2057 if (DefRange.IsSubfield) {
2058 // Unclear what matters here.
2059 DefRangeSubfieldRegisterSym Sym(S_DEFRANGE_SUBFIELD_REGISTER);
2060 Sym.Hdr.Register = DefRange.CVRegister;
2061 Sym.Hdr.MayHaveNoName = 0;
2062 Sym.Hdr.OffsetInParent = DefRange.StructOffset;
2064 ulittle16_t SymKind = ulittle16_t(S_DEFRANGE_SUBFIELD_REGISTER);
2065 BytePrefix += StringRef(reinterpret_cast<const char *>(&SymKind),
2067 BytePrefix += StringRef(reinterpret_cast<const char *>(&Sym.Hdr),
2070 // Unclear what matters here.
2071 DefRangeRegisterSym Sym(S_DEFRANGE_REGISTER);
2072 Sym.Hdr.Register = DefRange.CVRegister;
2073 Sym.Hdr.MayHaveNoName = 0;
2074 ulittle16_t SymKind = ulittle16_t(S_DEFRANGE_REGISTER);
2075 BytePrefix += StringRef(reinterpret_cast<const char *>(&SymKind),
2077 BytePrefix += StringRef(reinterpret_cast<const char *>(&Sym.Hdr),
2081 OS.EmitCVDefRangeDirective(DefRange.Ranges, BytePrefix);
2085 void CodeViewDebug::endFunctionImpl(const MachineFunction *MF) {
2086 const Function *GV = MF->getFunction();
2087 assert(FnDebugInfo.count(GV));
2088 assert(CurFn == &FnDebugInfo[GV]);
2090 collectVariableInfo(GV->getSubprogram());
2092 // Don't emit anything if we don't have any line tables.
2093 if (!CurFn->HaveLineInfo) {
2094 FnDebugInfo.erase(GV);
2099 CurFn->End = Asm->getFunctionEnd();
2104 void CodeViewDebug::beginInstruction(const MachineInstr *MI) {
2105 DebugHandlerBase::beginInstruction(MI);
2107 // Ignore DBG_VALUE locations and function prologue.
2108 if (!Asm || !CurFn || MI->isDebugValue() ||
2109 MI->getFlag(MachineInstr::FrameSetup))
2111 DebugLoc DL = MI->getDebugLoc();
2112 if (DL == PrevInstLoc || !DL)
2114 maybeRecordLocation(DL, Asm->MF);
2117 MCSymbol *CodeViewDebug::beginCVSubsection(ModuleSubstreamKind Kind) {
2118 MCSymbol *BeginLabel = MMI->getContext().createTempSymbol(),
2119 *EndLabel = MMI->getContext().createTempSymbol();
2120 OS.EmitIntValue(unsigned(Kind), 4);
2121 OS.AddComment("Subsection size");
2122 OS.emitAbsoluteSymbolDiff(EndLabel, BeginLabel, 4);
2123 OS.EmitLabel(BeginLabel);
2127 void CodeViewDebug::endCVSubsection(MCSymbol *EndLabel) {
2128 OS.EmitLabel(EndLabel);
2129 // Every subsection must be aligned to a 4-byte boundary.
2130 OS.EmitValueToAlignment(4);
2133 void CodeViewDebug::emitDebugInfoForUDTs(
2134 ArrayRef<std::pair<std::string, TypeIndex>> UDTs) {
2135 for (const std::pair<std::string, codeview::TypeIndex> &UDT : UDTs) {
2136 MCSymbol *UDTRecordBegin = MMI->getContext().createTempSymbol(),
2137 *UDTRecordEnd = MMI->getContext().createTempSymbol();
2138 OS.AddComment("Record length");
2139 OS.emitAbsoluteSymbolDiff(UDTRecordEnd, UDTRecordBegin, 2);
2140 OS.EmitLabel(UDTRecordBegin);
2142 OS.AddComment("Record kind: S_UDT");
2143 OS.EmitIntValue(unsigned(SymbolKind::S_UDT), 2);
2145 OS.AddComment("Type");
2146 OS.EmitIntValue(UDT.second.getIndex(), 4);
2148 emitNullTerminatedSymbolName(OS, UDT.first);
2149 OS.EmitLabel(UDTRecordEnd);
2153 void CodeViewDebug::emitDebugInfoForGlobals() {
2154 DenseMap<const DIGlobalVariableExpression *, const GlobalVariable *>
2156 for (const GlobalVariable &GV : MMI->getModule()->globals()) {
2157 SmallVector<DIGlobalVariableExpression *, 1> GVEs;
2158 GV.getDebugInfo(GVEs);
2159 for (const auto *GVE : GVEs)
2160 GlobalMap[GVE] = &GV;
2163 NamedMDNode *CUs = MMI->getModule()->getNamedMetadata("llvm.dbg.cu");
2164 for (const MDNode *Node : CUs->operands()) {
2165 const auto *CU = cast<DICompileUnit>(Node);
2167 // First, emit all globals that are not in a comdat in a single symbol
2168 // substream. MSVC doesn't like it if the substream is empty, so only open
2169 // it if we have at least one global to emit.
2170 switchToDebugSectionForSymbol(nullptr);
2171 MCSymbol *EndLabel = nullptr;
2172 for (const auto *GVE : CU->getGlobalVariables()) {
2173 if (const auto *GV = GlobalMap.lookup(GVE))
2174 if (!GV->hasComdat() && !GV->isDeclarationForLinker()) {
2176 OS.AddComment("Symbol subsection for globals");
2177 EndLabel = beginCVSubsection(ModuleSubstreamKind::Symbols);
2179 // FIXME: emitDebugInfoForGlobal() doesn't handle DIExpressions.
2180 emitDebugInfoForGlobal(GVE->getVariable(), GV, Asm->getSymbol(GV));
2184 endCVSubsection(EndLabel);
2186 // Second, emit each global that is in a comdat into its own .debug$S
2187 // section along with its own symbol substream.
2188 for (const auto *GVE : CU->getGlobalVariables()) {
2189 if (const auto *GV = GlobalMap.lookup(GVE)) {
2190 if (GV->hasComdat()) {
2191 MCSymbol *GVSym = Asm->getSymbol(GV);
2192 OS.AddComment("Symbol subsection for " +
2193 Twine(GlobalValue::getRealLinkageName(GV->getName())));
2194 switchToDebugSectionForSymbol(GVSym);
2195 EndLabel = beginCVSubsection(ModuleSubstreamKind::Symbols);
2196 // FIXME: emitDebugInfoForGlobal() doesn't handle DIExpressions.
2197 emitDebugInfoForGlobal(GVE->getVariable(), GV, GVSym);
2198 endCVSubsection(EndLabel);
2205 void CodeViewDebug::emitDebugInfoForRetainedTypes() {
2206 NamedMDNode *CUs = MMI->getModule()->getNamedMetadata("llvm.dbg.cu");
2207 for (const MDNode *Node : CUs->operands()) {
2208 for (auto *Ty : cast<DICompileUnit>(Node)->getRetainedTypes()) {
2209 if (DIType *RT = dyn_cast<DIType>(Ty)) {
2211 // FIXME: Add to global/local DTU list.
2217 void CodeViewDebug::emitDebugInfoForGlobal(const DIGlobalVariable *DIGV,
2218 const GlobalVariable *GV,
2220 // DataSym record, see SymbolRecord.h for more info.
2221 // FIXME: Thread local data, etc
2222 MCSymbol *DataBegin = MMI->getContext().createTempSymbol(),
2223 *DataEnd = MMI->getContext().createTempSymbol();
2224 OS.AddComment("Record length");
2225 OS.emitAbsoluteSymbolDiff(DataEnd, DataBegin, 2);
2226 OS.EmitLabel(DataBegin);
2227 if (DIGV->isLocalToUnit()) {
2228 if (GV->isThreadLocal()) {
2229 OS.AddComment("Record kind: S_LTHREAD32");
2230 OS.EmitIntValue(unsigned(SymbolKind::S_LTHREAD32), 2);
2232 OS.AddComment("Record kind: S_LDATA32");
2233 OS.EmitIntValue(unsigned(SymbolKind::S_LDATA32), 2);
2236 if (GV->isThreadLocal()) {
2237 OS.AddComment("Record kind: S_GTHREAD32");
2238 OS.EmitIntValue(unsigned(SymbolKind::S_GTHREAD32), 2);
2240 OS.AddComment("Record kind: S_GDATA32");
2241 OS.EmitIntValue(unsigned(SymbolKind::S_GDATA32), 2);
2244 OS.AddComment("Type");
2245 OS.EmitIntValue(getCompleteTypeIndex(DIGV->getType()).getIndex(), 4);
2246 OS.AddComment("DataOffset");
2247 OS.EmitCOFFSecRel32(GVSym, /*Offset=*/0);
2248 OS.AddComment("Segment");
2249 OS.EmitCOFFSectionIndex(GVSym);
2250 OS.AddComment("Name");
2251 emitNullTerminatedSymbolName(OS, DIGV->getName());
2252 OS.EmitLabel(DataEnd);