1 //===--- CGDebugInfo.cpp - Emit Debug Information for a Module ------------===//
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 coordinates the debug information generation while generating code.
12 //===----------------------------------------------------------------------===//
14 #include "CGDebugInfo.h"
17 #include "CGObjCRuntime.h"
18 #include "CGRecordLayout.h"
19 #include "CodeGenFunction.h"
20 #include "CodeGenModule.h"
21 #include "clang/AST/ASTContext.h"
22 #include "clang/AST/DeclFriend.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/AST/DeclTemplate.h"
25 #include "clang/AST/Expr.h"
26 #include "clang/AST/RecordLayout.h"
27 #include "clang/Basic/FileManager.h"
28 #include "clang/Basic/SourceManager.h"
29 #include "clang/Basic/Version.h"
30 #include "clang/Frontend/CodeGenOptions.h"
31 #include "clang/Lex/HeaderSearchOptions.h"
32 #include "clang/Lex/ModuleMap.h"
33 #include "clang/Lex/PreprocessorOptions.h"
34 #include "llvm/ADT/DenseSet.h"
35 #include "llvm/ADT/SmallVector.h"
36 #include "llvm/ADT/StringExtras.h"
37 #include "llvm/IR/Constants.h"
38 #include "llvm/IR/DataLayout.h"
39 #include "llvm/IR/DerivedTypes.h"
40 #include "llvm/IR/Instructions.h"
41 #include "llvm/IR/Intrinsics.h"
42 #include "llvm/IR/Module.h"
43 #include "llvm/Support/FileSystem.h"
44 #include "llvm/Support/MD5.h"
45 #include "llvm/Support/Path.h"
46 using namespace clang;
47 using namespace clang::CodeGen;
49 static uint32_t getTypeAlignIfRequired(const Type *Ty, const ASTContext &Ctx) {
50 auto TI = Ctx.getTypeInfo(Ty);
51 return TI.AlignIsRequired ? TI.Align : 0;
54 static uint32_t getTypeAlignIfRequired(QualType Ty, const ASTContext &Ctx) {
55 return getTypeAlignIfRequired(Ty.getTypePtr(), Ctx);
58 static uint32_t getDeclAlignIfRequired(const Decl *D, const ASTContext &Ctx) {
59 return D->hasAttr<AlignedAttr>() ? D->getMaxAlignment() : 0;
62 CGDebugInfo::CGDebugInfo(CodeGenModule &CGM)
63 : CGM(CGM), DebugKind(CGM.getCodeGenOpts().getDebugInfo()),
64 DebugTypeExtRefs(CGM.getCodeGenOpts().DebugTypeExtRefs),
65 DBuilder(CGM.getModule()) {
66 for (const auto &KV : CGM.getCodeGenOpts().DebugPrefixMap)
67 DebugPrefixMap[KV.first] = KV.second;
71 CGDebugInfo::~CGDebugInfo() {
72 assert(LexicalBlockStack.empty() &&
73 "Region stack mismatch, stack not empty!");
76 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
77 SourceLocation TemporaryLocation)
79 init(TemporaryLocation);
82 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
84 SourceLocation TemporaryLocation)
86 init(TemporaryLocation, DefaultToEmpty);
89 void ApplyDebugLocation::init(SourceLocation TemporaryLocation,
90 bool DefaultToEmpty) {
91 auto *DI = CGF->getDebugInfo();
97 OriginalLocation = CGF->Builder.getCurrentDebugLocation();
98 if (TemporaryLocation.isValid()) {
99 DI->EmitLocation(CGF->Builder, TemporaryLocation);
103 if (DefaultToEmpty) {
104 CGF->Builder.SetCurrentDebugLocation(llvm::DebugLoc());
108 // Construct a location that has a valid scope, but no line info.
109 assert(!DI->LexicalBlockStack.empty());
110 CGF->Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
111 0, 0, DI->LexicalBlockStack.back(), DI->getInlinedAt()));
114 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E)
116 init(E->getExprLoc());
119 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc)
121 if (!CGF.getDebugInfo()) {
125 OriginalLocation = CGF.Builder.getCurrentDebugLocation();
127 CGF.Builder.SetCurrentDebugLocation(std::move(Loc));
130 ApplyDebugLocation::~ApplyDebugLocation() {
131 // Query CGF so the location isn't overwritten when location updates are
132 // temporarily disabled (for C++ default function arguments)
134 CGF->Builder.SetCurrentDebugLocation(std::move(OriginalLocation));
137 ApplyInlineDebugLocation::ApplyInlineDebugLocation(CodeGenFunction &CGF,
138 GlobalDecl InlinedFn)
140 if (!CGF.getDebugInfo()) {
144 auto &DI = *CGF.getDebugInfo();
145 SavedLocation = DI.getLocation();
146 assert((DI.getInlinedAt() ==
147 CGF.Builder.getCurrentDebugLocation()->getInlinedAt()) &&
148 "CGDebugInfo and IRBuilder are out of sync");
150 DI.EmitInlineFunctionStart(CGF.Builder, InlinedFn);
153 ApplyInlineDebugLocation::~ApplyInlineDebugLocation() {
156 auto &DI = *CGF->getDebugInfo();
157 DI.EmitInlineFunctionEnd(CGF->Builder);
158 DI.EmitLocation(CGF->Builder, SavedLocation);
161 void CGDebugInfo::setLocation(SourceLocation Loc) {
162 // If the new location isn't valid return.
166 CurLoc = CGM.getContext().getSourceManager().getExpansionLoc(Loc);
168 // If we've changed files in the middle of a lexical scope go ahead
169 // and create a new lexical scope with file node if it's different
170 // from the one in the scope.
171 if (LexicalBlockStack.empty())
174 SourceManager &SM = CGM.getContext().getSourceManager();
175 auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
176 PresumedLoc PCLoc = SM.getPresumedLoc(CurLoc);
178 if (PCLoc.isInvalid() || Scope->getFilename() == PCLoc.getFilename())
181 if (auto *LBF = dyn_cast<llvm::DILexicalBlockFile>(Scope)) {
182 LexicalBlockStack.pop_back();
183 LexicalBlockStack.emplace_back(DBuilder.createLexicalBlockFile(
184 LBF->getScope(), getOrCreateFile(CurLoc)));
185 } else if (isa<llvm::DILexicalBlock>(Scope) ||
186 isa<llvm::DISubprogram>(Scope)) {
187 LexicalBlockStack.pop_back();
188 LexicalBlockStack.emplace_back(
189 DBuilder.createLexicalBlockFile(Scope, getOrCreateFile(CurLoc)));
193 llvm::DIScope *CGDebugInfo::getDeclContextDescriptor(const Decl *D) {
194 llvm::DIScope *Mod = getParentModuleOrNull(D);
195 return getContextDescriptor(cast<Decl>(D->getDeclContext()),
199 llvm::DIScope *CGDebugInfo::getContextDescriptor(const Decl *Context,
200 llvm::DIScope *Default) {
204 auto I = RegionMap.find(Context);
205 if (I != RegionMap.end()) {
206 llvm::Metadata *V = I->second;
207 return dyn_cast_or_null<llvm::DIScope>(V);
211 if (const auto *NSDecl = dyn_cast<NamespaceDecl>(Context))
212 return getOrCreateNameSpace(NSDecl);
214 if (const auto *RDecl = dyn_cast<RecordDecl>(Context))
215 if (!RDecl->isDependentType())
216 return getOrCreateType(CGM.getContext().getTypeDeclType(RDecl),
217 getOrCreateMainFile());
221 StringRef CGDebugInfo::getFunctionName(const FunctionDecl *FD) {
222 assert(FD && "Invalid FunctionDecl!");
223 IdentifierInfo *FII = FD->getIdentifier();
224 FunctionTemplateSpecializationInfo *Info =
225 FD->getTemplateSpecializationInfo();
227 // Emit the unqualified name in normal operation. LLVM and the debugger can
228 // compute the fully qualified name from the scope chain. If we're only
229 // emitting line table info, there won't be any scope chains, so emit the
230 // fully qualified name here so that stack traces are more accurate.
231 // FIXME: Do this when emitting DWARF as well as when emitting CodeView after
232 // evaluating the size impact.
233 bool UseQualifiedName = DebugKind == codegenoptions::DebugLineTablesOnly &&
234 CGM.getCodeGenOpts().EmitCodeView;
236 if (!Info && FII && !UseQualifiedName)
237 return FII->getName();
240 llvm::raw_svector_ostream OS(NS);
241 PrintingPolicy Policy(CGM.getLangOpts());
242 Policy.MSVCFormatting = CGM.getCodeGenOpts().EmitCodeView;
243 if (!UseQualifiedName)
246 FD->printQualifiedName(OS, Policy);
248 // Add any template specialization args.
250 const TemplateArgumentList *TArgs = Info->TemplateArguments;
251 TemplateSpecializationType::PrintTemplateArgumentList(OS, TArgs->asArray(),
255 // Copy this name on the side and use its reference.
256 return internString(OS.str());
259 StringRef CGDebugInfo::getObjCMethodName(const ObjCMethodDecl *OMD) {
260 SmallString<256> MethodName;
261 llvm::raw_svector_ostream OS(MethodName);
262 OS << (OMD->isInstanceMethod() ? '-' : '+') << '[';
263 const DeclContext *DC = OMD->getDeclContext();
264 if (const auto *OID = dyn_cast<ObjCImplementationDecl>(DC)) {
265 OS << OID->getName();
266 } else if (const auto *OID = dyn_cast<ObjCInterfaceDecl>(DC)) {
267 OS << OID->getName();
268 } else if (const auto *OC = dyn_cast<ObjCCategoryDecl>(DC)) {
269 if (OC->IsClassExtension()) {
270 OS << OC->getClassInterface()->getName();
272 OS << OC->getIdentifier()->getNameStart() << '('
273 << OC->getIdentifier()->getNameStart() << ')';
275 } else if (const auto *OCD = dyn_cast<ObjCCategoryImplDecl>(DC)) {
276 OS << OCD->getClassInterface()->getName() << '('
277 << OCD->getName() << ')';
278 } else if (isa<ObjCProtocolDecl>(DC)) {
279 // We can extract the type of the class from the self pointer.
280 if (ImplicitParamDecl *SelfDecl = OMD->getSelfDecl()) {
282 cast<ObjCObjectPointerType>(SelfDecl->getType())->getPointeeType();
283 ClassTy.print(OS, PrintingPolicy(LangOptions()));
286 OS << ' ' << OMD->getSelector().getAsString() << ']';
288 return internString(OS.str());
291 StringRef CGDebugInfo::getSelectorName(Selector S) {
292 return internString(S.getAsString());
295 StringRef CGDebugInfo::getClassName(const RecordDecl *RD) {
296 if (isa<ClassTemplateSpecializationDecl>(RD)) {
297 SmallString<128> Name;
298 llvm::raw_svector_ostream OS(Name);
299 RD->getNameForDiagnostic(OS, CGM.getContext().getPrintingPolicy(),
300 /*Qualified*/ false);
302 // Copy this name on the side and use its reference.
303 return internString(Name);
306 // quick optimization to avoid having to intern strings that are already
307 // stored reliably elsewhere
308 if (const IdentifierInfo *II = RD->getIdentifier())
309 return II->getName();
311 // The CodeView printer in LLVM wants to see the names of unnamed types: it is
312 // used to reconstruct the fully qualified type names.
313 if (CGM.getCodeGenOpts().EmitCodeView) {
314 if (const TypedefNameDecl *D = RD->getTypedefNameForAnonDecl()) {
315 assert(RD->getDeclContext() == D->getDeclContext() &&
316 "Typedef should not be in another decl context!");
317 assert(D->getDeclName().getAsIdentifierInfo() &&
318 "Typedef was not named!");
319 return D->getDeclName().getAsIdentifierInfo()->getName();
322 if (CGM.getLangOpts().CPlusPlus) {
325 ASTContext &Context = CGM.getContext();
326 if (const DeclaratorDecl *DD = Context.getDeclaratorForUnnamedTagDecl(RD))
327 // Anonymous types without a name for linkage purposes have their
328 // declarator mangled in if they have one.
329 Name = DD->getName();
330 else if (const TypedefNameDecl *TND =
331 Context.getTypedefNameForUnnamedTagDecl(RD))
332 // Anonymous types without a name for linkage purposes have their
333 // associate typedef mangled in if they have one.
334 Name = TND->getName();
337 SmallString<256> UnnamedType("<unnamed-type-");
340 return internString(UnnamedType);
348 llvm::DIFile::ChecksumKind
349 CGDebugInfo::computeChecksum(FileID FID, SmallString<32> &Checksum) const {
352 if (!CGM.getCodeGenOpts().EmitCodeView)
353 return llvm::DIFile::CSK_None;
355 SourceManager &SM = CGM.getContext().getSourceManager();
357 llvm::MemoryBuffer *MemBuffer = SM.getBuffer(FID, &Invalid);
359 return llvm::DIFile::CSK_None;
362 llvm::MD5::MD5Result Result;
364 Hash.update(MemBuffer->getBuffer());
367 Hash.stringifyResult(Result, Checksum);
368 return llvm::DIFile::CSK_MD5;
371 llvm::DIFile *CGDebugInfo::getOrCreateFile(SourceLocation Loc) {
373 // If Location is not valid then use main input file.
374 return DBuilder.createFile(remapDIPath(TheCU->getFilename()),
375 remapDIPath(TheCU->getDirectory()),
376 TheCU->getFile()->getChecksumKind(),
377 TheCU->getFile()->getChecksum());
379 SourceManager &SM = CGM.getContext().getSourceManager();
380 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
382 if (PLoc.isInvalid() || StringRef(PLoc.getFilename()).empty())
383 // If the location is not valid then use main input file.
384 return DBuilder.createFile(remapDIPath(TheCU->getFilename()),
385 remapDIPath(TheCU->getDirectory()),
386 TheCU->getFile()->getChecksumKind(),
387 TheCU->getFile()->getChecksum());
389 // Cache the results.
390 const char *fname = PLoc.getFilename();
391 auto it = DIFileCache.find(fname);
393 if (it != DIFileCache.end()) {
394 // Verify that the information still exists.
395 if (llvm::Metadata *V = it->second)
396 return cast<llvm::DIFile>(V);
399 SmallString<32> Checksum;
400 llvm::DIFile::ChecksumKind CSKind =
401 computeChecksum(SM.getFileID(Loc), Checksum);
403 llvm::DIFile *F = DBuilder.createFile(remapDIPath(PLoc.getFilename()),
404 remapDIPath(getCurrentDirname()),
407 DIFileCache[fname].reset(F);
411 llvm::DIFile *CGDebugInfo::getOrCreateMainFile() {
412 return DBuilder.createFile(remapDIPath(TheCU->getFilename()),
413 remapDIPath(TheCU->getDirectory()),
414 TheCU->getFile()->getChecksumKind(),
415 TheCU->getFile()->getChecksum());
418 std::string CGDebugInfo::remapDIPath(StringRef Path) const {
419 for (const auto &Entry : DebugPrefixMap)
420 if (Path.startswith(Entry.first))
421 return (Twine(Entry.second) + Path.substr(Entry.first.size())).str();
425 unsigned CGDebugInfo::getLineNumber(SourceLocation Loc) {
426 if (Loc.isInvalid() && CurLoc.isInvalid())
428 SourceManager &SM = CGM.getContext().getSourceManager();
429 PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
430 return PLoc.isValid() ? PLoc.getLine() : 0;
433 unsigned CGDebugInfo::getColumnNumber(SourceLocation Loc, bool Force) {
434 // We may not want column information at all.
435 if (!Force && !CGM.getCodeGenOpts().DebugColumnInfo)
438 // If the location is invalid then use the current column.
439 if (Loc.isInvalid() && CurLoc.isInvalid())
441 SourceManager &SM = CGM.getContext().getSourceManager();
442 PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
443 return PLoc.isValid() ? PLoc.getColumn() : 0;
446 StringRef CGDebugInfo::getCurrentDirname() {
447 if (!CGM.getCodeGenOpts().DebugCompilationDir.empty())
448 return CGM.getCodeGenOpts().DebugCompilationDir;
450 if (!CWDName.empty())
452 SmallString<256> CWD;
453 llvm::sys::fs::current_path(CWD);
454 return CWDName = internString(CWD);
457 void CGDebugInfo::CreateCompileUnit() {
458 SmallString<32> Checksum;
459 llvm::DIFile::ChecksumKind CSKind = llvm::DIFile::CSK_None;
461 // Should we be asking the SourceManager for the main file name, instead of
462 // accepting it as an argument? This just causes the main file name to
463 // mismatch with source locations and create extra lexical scopes or
464 // mismatched debug info (a CU with a DW_AT_file of "-", because that's what
465 // the driver passed, but functions/other things have DW_AT_file of "<stdin>"
466 // because that's what the SourceManager says)
468 // Get absolute path name.
469 SourceManager &SM = CGM.getContext().getSourceManager();
470 std::string MainFileName = CGM.getCodeGenOpts().MainFileName;
471 if (MainFileName.empty())
472 MainFileName = "<stdin>";
474 // The main file name provided via the "-main-file-name" option contains just
475 // the file name itself with no path information. This file name may have had
476 // a relative path, so we look into the actual file entry for the main
477 // file to determine the real absolute path for the file.
478 std::string MainFileDir;
479 if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
480 MainFileDir = remapDIPath(MainFile->getDir()->getName());
481 if (MainFileDir != ".") {
482 llvm::SmallString<1024> MainFileDirSS(MainFileDir);
483 llvm::sys::path::append(MainFileDirSS, MainFileName);
484 MainFileName = MainFileDirSS.str();
486 CSKind = computeChecksum(SM.getMainFileID(), Checksum);
489 llvm::dwarf::SourceLanguage LangTag;
490 const LangOptions &LO = CGM.getLangOpts();
493 LangTag = llvm::dwarf::DW_LANG_ObjC_plus_plus;
495 LangTag = llvm::dwarf::DW_LANG_C_plus_plus;
496 } else if (LO.ObjC1) {
497 LangTag = llvm::dwarf::DW_LANG_ObjC;
498 } else if (LO.RenderScript) {
499 LangTag = llvm::dwarf::DW_LANG_GOOGLE_RenderScript;
501 LangTag = llvm::dwarf::DW_LANG_C99;
503 LangTag = llvm::dwarf::DW_LANG_C89;
506 std::string Producer = getClangFullVersion();
508 // Figure out which version of the ObjC runtime we have.
509 unsigned RuntimeVers = 0;
511 RuntimeVers = LO.ObjCRuntime.isNonFragile() ? 2 : 1;
513 llvm::DICompileUnit::DebugEmissionKind EmissionKind;
515 case codegenoptions::NoDebugInfo:
516 case codegenoptions::LocTrackingOnly:
517 EmissionKind = llvm::DICompileUnit::NoDebug;
519 case codegenoptions::DebugLineTablesOnly:
520 EmissionKind = llvm::DICompileUnit::LineTablesOnly;
522 case codegenoptions::LimitedDebugInfo:
523 case codegenoptions::FullDebugInfo:
524 EmissionKind = llvm::DICompileUnit::FullDebug;
528 // Create new compile unit.
529 // FIXME - Eliminate TheCU.
530 TheCU = DBuilder.createCompileUnit(
532 DBuilder.createFile(remapDIPath(MainFileName),
533 remapDIPath(getCurrentDirname()), CSKind, Checksum),
534 Producer, LO.Optimize, CGM.getCodeGenOpts().DwarfDebugFlags, RuntimeVers,
535 CGM.getCodeGenOpts().EnableSplitDwarf
537 : CGM.getCodeGenOpts().SplitDwarfFile,
538 EmissionKind, 0 /* DWOid */, CGM.getCodeGenOpts().SplitDwarfInlining,
539 CGM.getCodeGenOpts().DebugInfoForProfiling);
542 llvm::DIType *CGDebugInfo::CreateType(const BuiltinType *BT) {
543 llvm::dwarf::TypeKind Encoding;
545 switch (BT->getKind()) {
546 #define BUILTIN_TYPE(Id, SingletonId)
547 #define PLACEHOLDER_TYPE(Id, SingletonId) case BuiltinType::Id:
548 #include "clang/AST/BuiltinTypes.def"
549 case BuiltinType::Dependent:
550 llvm_unreachable("Unexpected builtin type");
551 case BuiltinType::NullPtr:
552 return DBuilder.createNullPtrType();
553 case BuiltinType::Void:
555 case BuiltinType::ObjCClass:
557 ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
559 getOrCreateMainFile(), 0);
561 case BuiltinType::ObjCId: {
562 // typedef struct objc_class *Class;
563 // typedef struct objc_object {
571 ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
573 getOrCreateMainFile(), 0);
575 unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
577 auto *ISATy = DBuilder.createPointerType(ClassTy, Size);
579 ObjTy = DBuilder.createStructType(
580 TheCU, "objc_object", getOrCreateMainFile(), 0, 0, 0,
581 llvm::DINode::FlagZero, nullptr, llvm::DINodeArray());
583 DBuilder.replaceArrays(
584 ObjTy, DBuilder.getOrCreateArray(&*DBuilder.createMemberType(
585 ObjTy, "isa", getOrCreateMainFile(), 0, Size, 0, 0,
586 llvm::DINode::FlagZero, ISATy)));
589 case BuiltinType::ObjCSel: {
591 SelTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
592 "objc_selector", TheCU,
593 getOrCreateMainFile(), 0);
597 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
598 case BuiltinType::Id: \
599 return getOrCreateStructPtrType("opencl_" #ImgType "_" #Suffix "_t", \
601 #include "clang/Basic/OpenCLImageTypes.def"
602 case BuiltinType::OCLSampler:
603 return getOrCreateStructPtrType("opencl_sampler_t",
605 case BuiltinType::OCLEvent:
606 return getOrCreateStructPtrType("opencl_event_t", OCLEventDITy);
607 case BuiltinType::OCLClkEvent:
608 return getOrCreateStructPtrType("opencl_clk_event_t", OCLClkEventDITy);
609 case BuiltinType::OCLQueue:
610 return getOrCreateStructPtrType("opencl_queue_t", OCLQueueDITy);
611 case BuiltinType::OCLReserveID:
612 return getOrCreateStructPtrType("opencl_reserve_id_t", OCLReserveIDDITy);
614 case BuiltinType::UChar:
615 case BuiltinType::Char_U:
616 Encoding = llvm::dwarf::DW_ATE_unsigned_char;
618 case BuiltinType::Char_S:
619 case BuiltinType::SChar:
620 Encoding = llvm::dwarf::DW_ATE_signed_char;
622 case BuiltinType::Char16:
623 case BuiltinType::Char32:
624 Encoding = llvm::dwarf::DW_ATE_UTF;
626 case BuiltinType::UShort:
627 case BuiltinType::UInt:
628 case BuiltinType::UInt128:
629 case BuiltinType::ULong:
630 case BuiltinType::WChar_U:
631 case BuiltinType::ULongLong:
632 Encoding = llvm::dwarf::DW_ATE_unsigned;
634 case BuiltinType::Short:
635 case BuiltinType::Int:
636 case BuiltinType::Int128:
637 case BuiltinType::Long:
638 case BuiltinType::WChar_S:
639 case BuiltinType::LongLong:
640 Encoding = llvm::dwarf::DW_ATE_signed;
642 case BuiltinType::Bool:
643 Encoding = llvm::dwarf::DW_ATE_boolean;
645 case BuiltinType::Half:
646 case BuiltinType::Float:
647 case BuiltinType::LongDouble:
648 case BuiltinType::Float128:
649 case BuiltinType::Double:
650 // FIXME: For targets where long double and __float128 have the same size,
651 // they are currently indistinguishable in the debugger without some
652 // special treatment. However, there is currently no consensus on encoding
653 // and this should be updated once a DWARF encoding exists for distinct
654 // floating point types of the same size.
655 Encoding = llvm::dwarf::DW_ATE_float;
659 switch (BT->getKind()) {
660 case BuiltinType::Long:
663 case BuiltinType::LongLong:
664 BTName = "long long int";
666 case BuiltinType::ULong:
667 BTName = "long unsigned int";
669 case BuiltinType::ULongLong:
670 BTName = "long long unsigned int";
673 BTName = BT->getName(CGM.getLangOpts());
676 // Bit size and offset of the type.
677 uint64_t Size = CGM.getContext().getTypeSize(BT);
678 return DBuilder.createBasicType(BTName, Size, Encoding);
681 llvm::DIType *CGDebugInfo::CreateType(const ComplexType *Ty) {
682 // Bit size and offset of the type.
683 llvm::dwarf::TypeKind Encoding = llvm::dwarf::DW_ATE_complex_float;
684 if (Ty->isComplexIntegerType())
685 Encoding = llvm::dwarf::DW_ATE_lo_user;
687 uint64_t Size = CGM.getContext().getTypeSize(Ty);
688 return DBuilder.createBasicType("complex", Size, Encoding);
691 llvm::DIType *CGDebugInfo::CreateQualifiedType(QualType Ty,
692 llvm::DIFile *Unit) {
693 QualifierCollector Qc;
694 const Type *T = Qc.strip(Ty);
696 // Ignore these qualifiers for now.
697 Qc.removeObjCGCAttr();
698 Qc.removeAddressSpace();
699 Qc.removeObjCLifetime();
701 // We will create one Derived type for one qualifier and recurse to handle any
703 llvm::dwarf::Tag Tag;
705 Tag = llvm::dwarf::DW_TAG_const_type;
707 } else if (Qc.hasVolatile()) {
708 Tag = llvm::dwarf::DW_TAG_volatile_type;
710 } else if (Qc.hasRestrict()) {
711 Tag = llvm::dwarf::DW_TAG_restrict_type;
714 assert(Qc.empty() && "Unknown type qualifier for debug info");
715 return getOrCreateType(QualType(T, 0), Unit);
718 auto *FromTy = getOrCreateType(Qc.apply(CGM.getContext(), T), Unit);
720 // No need to fill in the Name, Line, Size, Alignment, Offset in case of
721 // CVR derived types.
722 return DBuilder.createQualifiedType(Tag, FromTy);
725 llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectPointerType *Ty,
726 llvm::DIFile *Unit) {
728 // The frontend treats 'id' as a typedef to an ObjCObjectType,
729 // whereas 'id<protocol>' is treated as an ObjCPointerType. For the
730 // debug info, we want to emit 'id' in both cases.
731 if (Ty->isObjCQualifiedIdType())
732 return getOrCreateType(CGM.getContext().getObjCIdType(), Unit);
734 return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
735 Ty->getPointeeType(), Unit);
738 llvm::DIType *CGDebugInfo::CreateType(const PointerType *Ty,
739 llvm::DIFile *Unit) {
740 return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
741 Ty->getPointeeType(), Unit);
744 /// \return whether a C++ mangling exists for the type defined by TD.
745 static bool hasCXXMangling(const TagDecl *TD, llvm::DICompileUnit *TheCU) {
746 switch (TheCU->getSourceLanguage()) {
747 case llvm::dwarf::DW_LANG_C_plus_plus:
749 case llvm::dwarf::DW_LANG_ObjC_plus_plus:
750 return isa<CXXRecordDecl>(TD) || isa<EnumDecl>(TD);
756 /// In C++ mode, types have linkage, so we can rely on the ODR and
757 /// on their mangled names, if they're external.
758 static SmallString<256> getUniqueTagTypeName(const TagType *Ty,
760 llvm::DICompileUnit *TheCU) {
761 SmallString<256> FullName;
762 const TagDecl *TD = Ty->getDecl();
764 if (!hasCXXMangling(TD, TheCU) || !TD->isExternallyVisible())
767 // TODO: This is using the RTTI name. Is there a better way to get
768 // a unique string for a type?
769 llvm::raw_svector_ostream Out(FullName);
770 CGM.getCXXABI().getMangleContext().mangleCXXRTTIName(QualType(Ty, 0), Out);
774 /// \return the approproate DWARF tag for a composite type.
775 static llvm::dwarf::Tag getTagForRecord(const RecordDecl *RD) {
776 llvm::dwarf::Tag Tag;
777 if (RD->isStruct() || RD->isInterface())
778 Tag = llvm::dwarf::DW_TAG_structure_type;
779 else if (RD->isUnion())
780 Tag = llvm::dwarf::DW_TAG_union_type;
782 // FIXME: This could be a struct type giving a default visibility different
783 // than C++ class type, but needs llvm metadata changes first.
784 assert(RD->isClass());
785 Tag = llvm::dwarf::DW_TAG_class_type;
790 llvm::DICompositeType *
791 CGDebugInfo::getOrCreateRecordFwdDecl(const RecordType *Ty,
792 llvm::DIScope *Ctx) {
793 const RecordDecl *RD = Ty->getDecl();
794 if (llvm::DIType *T = getTypeOrNull(CGM.getContext().getRecordType(RD)))
795 return cast<llvm::DICompositeType>(T);
796 llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
797 unsigned Line = getLineNumber(RD->getLocation());
798 StringRef RDName = getClassName(RD);
804 SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
805 llvm::DICompositeType *RetTy = DBuilder.createReplaceableCompositeType(
806 getTagForRecord(RD), RDName, Ctx, DefUnit, Line, 0, Size, Align,
807 llvm::DINode::FlagFwdDecl, FullName);
808 ReplaceMap.emplace_back(
809 std::piecewise_construct, std::make_tuple(Ty),
810 std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
814 llvm::DIType *CGDebugInfo::CreatePointerLikeType(llvm::dwarf::Tag Tag,
817 llvm::DIFile *Unit) {
818 // Bit size, align and offset of the type.
819 // Size is always the size of a pointer. We can't use getTypeSize here
820 // because that does not return the correct value for references.
821 unsigned AddressSpace = CGM.getContext().getTargetAddressSpace(PointeeTy);
822 uint64_t Size = CGM.getTarget().getPointerWidth(AddressSpace);
823 auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
824 Optional<unsigned> DWARFAddressSpace =
825 CGM.getTarget().getDWARFAddressSpace(AddressSpace);
827 if (Tag == llvm::dwarf::DW_TAG_reference_type ||
828 Tag == llvm::dwarf::DW_TAG_rvalue_reference_type)
829 return DBuilder.createReferenceType(Tag, getOrCreateType(PointeeTy, Unit),
830 Size, Align, DWARFAddressSpace);
832 return DBuilder.createPointerType(getOrCreateType(PointeeTy, Unit), Size,
833 Align, DWARFAddressSpace);
836 llvm::DIType *CGDebugInfo::getOrCreateStructPtrType(StringRef Name,
837 llvm::DIType *&Cache) {
840 Cache = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type, Name,
841 TheCU, getOrCreateMainFile(), 0);
842 unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
843 Cache = DBuilder.createPointerType(Cache, Size);
847 llvm::DIType *CGDebugInfo::CreateType(const BlockPointerType *Ty,
848 llvm::DIFile *Unit) {
849 SmallVector<llvm::Metadata *, 8> EltTys;
851 uint64_t FieldSize, FieldOffset;
853 llvm::DINodeArray Elements;
856 FType = CGM.getContext().UnsignedLongTy;
857 EltTys.push_back(CreateMemberType(Unit, FType, "reserved", &FieldOffset));
858 EltTys.push_back(CreateMemberType(Unit, FType, "Size", &FieldOffset));
860 Elements = DBuilder.getOrCreateArray(EltTys);
863 llvm::DINode::DIFlags Flags = llvm::DINode::FlagAppleBlock;
867 DBuilder.createStructType(Unit, "__block_descriptor", nullptr, LineNo,
868 FieldOffset, 0, Flags, nullptr, Elements);
870 // Bit size, align and offset of the type.
871 uint64_t Size = CGM.getContext().getTypeSize(Ty);
873 auto *DescTy = DBuilder.createPointerType(EltTy, Size);
876 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
877 EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
878 FType = CGM.getContext().IntTy;
879 EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
880 EltTys.push_back(CreateMemberType(Unit, FType, "__reserved", &FieldOffset));
881 FType = CGM.getContext().getPointerType(Ty->getPointeeType());
882 EltTys.push_back(CreateMemberType(Unit, FType, "__FuncPtr", &FieldOffset));
884 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
885 FieldSize = CGM.getContext().getTypeSize(Ty);
886 FieldAlign = CGM.getContext().getTypeAlign(Ty);
887 EltTys.push_back(DBuilder.createMemberType(
888 Unit, "__descriptor", nullptr, LineNo, FieldSize, FieldAlign, FieldOffset,
889 llvm::DINode::FlagZero, DescTy));
891 FieldOffset += FieldSize;
892 Elements = DBuilder.getOrCreateArray(EltTys);
894 // The __block_literal_generic structs are marked with a special
895 // DW_AT_APPLE_BLOCK attribute and are an implementation detail only
896 // the debugger needs to know about. To allow type uniquing, emit
897 // them without a name or a location.
899 DBuilder.createStructType(Unit, "", nullptr, LineNo,
900 FieldOffset, 0, Flags, nullptr, Elements);
902 return DBuilder.createPointerType(EltTy, Size);
905 llvm::DIType *CGDebugInfo::CreateType(const TemplateSpecializationType *Ty,
906 llvm::DIFile *Unit) {
907 assert(Ty->isTypeAlias());
908 llvm::DIType *Src = getOrCreateType(Ty->getAliasedType(), Unit);
911 llvm::raw_svector_ostream OS(NS);
912 Ty->getTemplateName().print(OS, CGM.getContext().getPrintingPolicy(),
913 /*qualified*/ false);
915 TemplateSpecializationType::PrintTemplateArgumentList(
916 OS, Ty->template_arguments(),
917 CGM.getContext().getPrintingPolicy());
919 auto *AliasDecl = cast<TypeAliasTemplateDecl>(
920 Ty->getTemplateName().getAsTemplateDecl())->getTemplatedDecl();
922 SourceLocation Loc = AliasDecl->getLocation();
923 return DBuilder.createTypedef(Src, OS.str(), getOrCreateFile(Loc),
925 getDeclContextDescriptor(AliasDecl));
928 llvm::DIType *CGDebugInfo::CreateType(const TypedefType *Ty,
929 llvm::DIFile *Unit) {
930 // We don't set size information, but do specify where the typedef was
932 SourceLocation Loc = Ty->getDecl()->getLocation();
934 // Typedefs are derived from some other type.
935 return DBuilder.createTypedef(
936 getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit),
937 Ty->getDecl()->getName(), getOrCreateFile(Loc), getLineNumber(Loc),
938 getDeclContextDescriptor(Ty->getDecl()));
941 static unsigned getDwarfCC(CallingConv CC) {
944 // Avoid emitting DW_AT_calling_convention if the C convention was used.
948 return llvm::dwarf::DW_CC_BORLAND_stdcall;
950 return llvm::dwarf::DW_CC_BORLAND_msfastcall;
952 return llvm::dwarf::DW_CC_BORLAND_thiscall;
953 case CC_X86VectorCall:
954 return llvm::dwarf::DW_CC_LLVM_vectorcall;
956 return llvm::dwarf::DW_CC_BORLAND_pascal;
958 // FIXME: Create new DW_CC_ codes for these calling conventions.
963 case CC_IntelOclBicc:
964 case CC_SpirFunction:
965 case CC_OpenCLKernel:
967 case CC_PreserveMost:
975 llvm::DIType *CGDebugInfo::CreateType(const FunctionType *Ty,
976 llvm::DIFile *Unit) {
977 SmallVector<llvm::Metadata *, 16> EltTys;
979 // Add the result type at least.
980 EltTys.push_back(getOrCreateType(Ty->getReturnType(), Unit));
982 // Set up remainder of arguments if there is a prototype.
983 // otherwise emit it as a variadic function.
984 if (isa<FunctionNoProtoType>(Ty))
985 EltTys.push_back(DBuilder.createUnspecifiedParameter());
986 else if (const auto *FPT = dyn_cast<FunctionProtoType>(Ty)) {
987 for (const QualType &ParamType : FPT->param_types())
988 EltTys.push_back(getOrCreateType(ParamType, Unit));
989 if (FPT->isVariadic())
990 EltTys.push_back(DBuilder.createUnspecifiedParameter());
993 llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
994 return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
995 getDwarfCC(Ty->getCallConv()));
998 /// Convert an AccessSpecifier into the corresponding DINode flag.
999 /// As an optimization, return 0 if the access specifier equals the
1000 /// default for the containing type.
1001 static llvm::DINode::DIFlags getAccessFlag(AccessSpecifier Access,
1002 const RecordDecl *RD) {
1003 AccessSpecifier Default = clang::AS_none;
1004 if (RD && RD->isClass())
1005 Default = clang::AS_private;
1006 else if (RD && (RD->isStruct() || RD->isUnion()))
1007 Default = clang::AS_public;
1009 if (Access == Default)
1010 return llvm::DINode::FlagZero;
1013 case clang::AS_private:
1014 return llvm::DINode::FlagPrivate;
1015 case clang::AS_protected:
1016 return llvm::DINode::FlagProtected;
1017 case clang::AS_public:
1018 return llvm::DINode::FlagPublic;
1019 case clang::AS_none:
1020 return llvm::DINode::FlagZero;
1022 llvm_unreachable("unexpected access enumerator");
1025 llvm::DIType *CGDebugInfo::createBitFieldType(const FieldDecl *BitFieldDecl,
1026 llvm::DIScope *RecordTy,
1027 const RecordDecl *RD) {
1028 StringRef Name = BitFieldDecl->getName();
1029 QualType Ty = BitFieldDecl->getType();
1030 SourceLocation Loc = BitFieldDecl->getLocation();
1031 llvm::DIFile *VUnit = getOrCreateFile(Loc);
1032 llvm::DIType *DebugType = getOrCreateType(Ty, VUnit);
1034 // Get the location for the field.
1035 llvm::DIFile *File = getOrCreateFile(Loc);
1036 unsigned Line = getLineNumber(Loc);
1038 const CGBitFieldInfo &BitFieldInfo =
1039 CGM.getTypes().getCGRecordLayout(RD).getBitFieldInfo(BitFieldDecl);
1040 uint64_t SizeInBits = BitFieldInfo.Size;
1041 assert(SizeInBits > 0 && "found named 0-width bitfield");
1042 uint64_t StorageOffsetInBits =
1043 CGM.getContext().toBits(BitFieldInfo.StorageOffset);
1044 uint64_t OffsetInBits = StorageOffsetInBits + BitFieldInfo.Offset;
1045 llvm::DINode::DIFlags Flags = getAccessFlag(BitFieldDecl->getAccess(), RD);
1046 return DBuilder.createBitFieldMemberType(
1047 RecordTy, Name, File, Line, SizeInBits, OffsetInBits, StorageOffsetInBits,
1052 CGDebugInfo::createFieldType(StringRef name, QualType type, SourceLocation loc,
1053 AccessSpecifier AS, uint64_t offsetInBits,
1054 uint32_t AlignInBits, llvm::DIFile *tunit,
1055 llvm::DIScope *scope, const RecordDecl *RD) {
1056 llvm::DIType *debugType = getOrCreateType(type, tunit);
1058 // Get the location for the field.
1059 llvm::DIFile *file = getOrCreateFile(loc);
1060 unsigned line = getLineNumber(loc);
1062 uint64_t SizeInBits = 0;
1063 auto Align = AlignInBits;
1064 if (!type->isIncompleteArrayType()) {
1065 TypeInfo TI = CGM.getContext().getTypeInfo(type);
1066 SizeInBits = TI.Width;
1068 Align = getTypeAlignIfRequired(type, CGM.getContext());
1071 llvm::DINode::DIFlags flags = getAccessFlag(AS, RD);
1072 return DBuilder.createMemberType(scope, name, file, line, SizeInBits,
1073 Align, offsetInBits, flags, debugType);
1076 void CGDebugInfo::CollectRecordLambdaFields(
1077 const CXXRecordDecl *CXXDecl, SmallVectorImpl<llvm::Metadata *> &elements,
1078 llvm::DIType *RecordTy) {
1079 // For C++11 Lambdas a Field will be the same as a Capture, but the Capture
1080 // has the name and the location of the variable so we should iterate over
1081 // both concurrently.
1082 const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(CXXDecl);
1083 RecordDecl::field_iterator Field = CXXDecl->field_begin();
1084 unsigned fieldno = 0;
1085 for (CXXRecordDecl::capture_const_iterator I = CXXDecl->captures_begin(),
1086 E = CXXDecl->captures_end();
1087 I != E; ++I, ++Field, ++fieldno) {
1088 const LambdaCapture &C = *I;
1089 if (C.capturesVariable()) {
1090 SourceLocation Loc = C.getLocation();
1091 assert(!Field->isBitField() && "lambdas don't have bitfield members!");
1092 VarDecl *V = C.getCapturedVar();
1093 StringRef VName = V->getName();
1094 llvm::DIFile *VUnit = getOrCreateFile(Loc);
1095 auto Align = getDeclAlignIfRequired(V, CGM.getContext());
1096 llvm::DIType *FieldType = createFieldType(
1097 VName, Field->getType(), Loc, Field->getAccess(),
1098 layout.getFieldOffset(fieldno), Align, VUnit, RecordTy, CXXDecl);
1099 elements.push_back(FieldType);
1100 } else if (C.capturesThis()) {
1101 // TODO: Need to handle 'this' in some way by probably renaming the
1102 // this of the lambda class and having a field member of 'this' or
1103 // by using AT_object_pointer for the function and having that be
1104 // used as 'this' for semantic references.
1105 FieldDecl *f = *Field;
1106 llvm::DIFile *VUnit = getOrCreateFile(f->getLocation());
1107 QualType type = f->getType();
1108 llvm::DIType *fieldType = createFieldType(
1109 "this", type, f->getLocation(), f->getAccess(),
1110 layout.getFieldOffset(fieldno), VUnit, RecordTy, CXXDecl);
1112 elements.push_back(fieldType);
1117 llvm::DIDerivedType *
1118 CGDebugInfo::CreateRecordStaticField(const VarDecl *Var, llvm::DIType *RecordTy,
1119 const RecordDecl *RD) {
1120 // Create the descriptor for the static variable, with or without
1121 // constant initializers.
1122 Var = Var->getCanonicalDecl();
1123 llvm::DIFile *VUnit = getOrCreateFile(Var->getLocation());
1124 llvm::DIType *VTy = getOrCreateType(Var->getType(), VUnit);
1126 unsigned LineNumber = getLineNumber(Var->getLocation());
1127 StringRef VName = Var->getName();
1128 llvm::Constant *C = nullptr;
1129 if (Var->getInit()) {
1130 const APValue *Value = Var->evaluateValue();
1133 C = llvm::ConstantInt::get(CGM.getLLVMContext(), Value->getInt());
1134 if (Value->isFloat())
1135 C = llvm::ConstantFP::get(CGM.getLLVMContext(), Value->getFloat());
1139 llvm::DINode::DIFlags Flags = getAccessFlag(Var->getAccess(), RD);
1140 auto Align = getDeclAlignIfRequired(Var, CGM.getContext());
1141 llvm::DIDerivedType *GV = DBuilder.createStaticMemberType(
1142 RecordTy, VName, VUnit, LineNumber, VTy, Flags, C, Align);
1143 StaticDataMemberCache[Var->getCanonicalDecl()].reset(GV);
1147 void CGDebugInfo::CollectRecordNormalField(
1148 const FieldDecl *field, uint64_t OffsetInBits, llvm::DIFile *tunit,
1149 SmallVectorImpl<llvm::Metadata *> &elements, llvm::DIType *RecordTy,
1150 const RecordDecl *RD) {
1151 StringRef name = field->getName();
1152 QualType type = field->getType();
1154 // Ignore unnamed fields unless they're anonymous structs/unions.
1155 if (name.empty() && !type->isRecordType())
1158 llvm::DIType *FieldType;
1159 if (field->isBitField()) {
1160 FieldType = createBitFieldType(field, RecordTy, RD);
1162 auto Align = getDeclAlignIfRequired(field, CGM.getContext());
1164 createFieldType(name, type, field->getLocation(), field->getAccess(),
1165 OffsetInBits, Align, tunit, RecordTy, RD);
1168 elements.push_back(FieldType);
1171 void CGDebugInfo::CollectRecordNestedRecord(
1172 const RecordDecl *RD, SmallVectorImpl<llvm::Metadata *> &elements) {
1173 QualType Ty = CGM.getContext().getTypeDeclType(RD);
1174 // Injected class names are not considered nested records.
1175 if (isa<InjectedClassNameType>(Ty))
1177 SourceLocation Loc = RD->getLocation();
1178 llvm::DIType *nestedType = getOrCreateType(Ty, getOrCreateFile(Loc));
1179 elements.push_back(nestedType);
1182 void CGDebugInfo::CollectRecordFields(
1183 const RecordDecl *record, llvm::DIFile *tunit,
1184 SmallVectorImpl<llvm::Metadata *> &elements,
1185 llvm::DICompositeType *RecordTy) {
1186 const auto *CXXDecl = dyn_cast<CXXRecordDecl>(record);
1188 if (CXXDecl && CXXDecl->isLambda())
1189 CollectRecordLambdaFields(CXXDecl, elements, RecordTy);
1191 const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(record);
1193 // Debug info for nested records is included in the member list only for
1195 bool IncludeNestedRecords = CGM.getCodeGenOpts().EmitCodeView;
1197 // Field number for non-static fields.
1198 unsigned fieldNo = 0;
1200 // Static and non-static members should appear in the same order as
1201 // the corresponding declarations in the source program.
1202 for (const auto *I : record->decls())
1203 if (const auto *V = dyn_cast<VarDecl>(I)) {
1204 if (V->hasAttr<NoDebugAttr>())
1206 // Reuse the existing static member declaration if one exists
1207 auto MI = StaticDataMemberCache.find(V->getCanonicalDecl());
1208 if (MI != StaticDataMemberCache.end()) {
1209 assert(MI->second &&
1210 "Static data member declaration should still exist");
1211 elements.push_back(MI->second);
1213 auto Field = CreateRecordStaticField(V, RecordTy, record);
1214 elements.push_back(Field);
1216 } else if (const auto *field = dyn_cast<FieldDecl>(I)) {
1217 CollectRecordNormalField(field, layout.getFieldOffset(fieldNo), tunit,
1218 elements, RecordTy, record);
1220 // Bump field number for next field.
1222 } else if (const auto *nestedRec = dyn_cast<CXXRecordDecl>(I))
1223 if (IncludeNestedRecords && !nestedRec->isImplicit() &&
1224 nestedRec->getDeclContext() == record)
1225 CollectRecordNestedRecord(nestedRec, elements);
1229 llvm::DISubroutineType *
1230 CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
1231 llvm::DIFile *Unit) {
1232 const FunctionProtoType *Func = Method->getType()->getAs<FunctionProtoType>();
1233 if (Method->isStatic())
1234 return cast_or_null<llvm::DISubroutineType>(
1235 getOrCreateType(QualType(Func, 0), Unit));
1236 return getOrCreateInstanceMethodType(Method->getThisType(CGM.getContext()),
1240 llvm::DISubroutineType *CGDebugInfo::getOrCreateInstanceMethodType(
1241 QualType ThisPtr, const FunctionProtoType *Func, llvm::DIFile *Unit) {
1242 // Add "this" pointer.
1243 llvm::DITypeRefArray Args(
1244 cast<llvm::DISubroutineType>(getOrCreateType(QualType(Func, 0), Unit))
1246 assert(Args.size() && "Invalid number of arguments!");
1248 SmallVector<llvm::Metadata *, 16> Elts;
1250 // First element is always return type. For 'void' functions it is NULL.
1251 Elts.push_back(Args[0]);
1253 // "this" pointer is always first argument.
1254 const CXXRecordDecl *RD = ThisPtr->getPointeeCXXRecordDecl();
1255 if (isa<ClassTemplateSpecializationDecl>(RD)) {
1256 // Create pointer type directly in this case.
1257 const PointerType *ThisPtrTy = cast<PointerType>(ThisPtr);
1258 QualType PointeeTy = ThisPtrTy->getPointeeType();
1259 unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
1260 uint64_t Size = CGM.getTarget().getPointerWidth(AS);
1261 auto Align = getTypeAlignIfRequired(ThisPtrTy, CGM.getContext());
1262 llvm::DIType *PointeeType = getOrCreateType(PointeeTy, Unit);
1263 llvm::DIType *ThisPtrType =
1264 DBuilder.createPointerType(PointeeType, Size, Align);
1265 TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
1266 // TODO: This and the artificial type below are misleading, the
1267 // types aren't artificial the argument is, but the current
1268 // metadata doesn't represent that.
1269 ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1270 Elts.push_back(ThisPtrType);
1272 llvm::DIType *ThisPtrType = getOrCreateType(ThisPtr, Unit);
1273 TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
1274 ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1275 Elts.push_back(ThisPtrType);
1278 // Copy rest of the arguments.
1279 for (unsigned i = 1, e = Args.size(); i != e; ++i)
1280 Elts.push_back(Args[i]);
1282 llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
1284 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
1285 if (Func->getExtProtoInfo().RefQualifier == RQ_LValue)
1286 Flags |= llvm::DINode::FlagLValueReference;
1287 if (Func->getExtProtoInfo().RefQualifier == RQ_RValue)
1288 Flags |= llvm::DINode::FlagRValueReference;
1290 return DBuilder.createSubroutineType(EltTypeArray, Flags,
1291 getDwarfCC(Func->getCallConv()));
1294 /// isFunctionLocalClass - Return true if CXXRecordDecl is defined
1295 /// inside a function.
1296 static bool isFunctionLocalClass(const CXXRecordDecl *RD) {
1297 if (const auto *NRD = dyn_cast<CXXRecordDecl>(RD->getDeclContext()))
1298 return isFunctionLocalClass(NRD);
1299 if (isa<FunctionDecl>(RD->getDeclContext()))
1304 llvm::DISubprogram *CGDebugInfo::CreateCXXMemberFunction(
1305 const CXXMethodDecl *Method, llvm::DIFile *Unit, llvm::DIType *RecordTy) {
1307 isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method);
1309 StringRef MethodName = getFunctionName(Method);
1310 llvm::DISubroutineType *MethodTy = getOrCreateMethodType(Method, Unit);
1312 // Since a single ctor/dtor corresponds to multiple functions, it doesn't
1313 // make sense to give a single ctor/dtor a linkage name.
1314 StringRef MethodLinkageName;
1315 // FIXME: 'isFunctionLocalClass' seems like an arbitrary/unintentional
1316 // property to use here. It may've been intended to model "is non-external
1317 // type" but misses cases of non-function-local but non-external classes such
1318 // as those in anonymous namespaces as well as the reverse - external types
1319 // that are function local, such as those in (non-local) inline functions.
1320 if (!IsCtorOrDtor && !isFunctionLocalClass(Method->getParent()))
1321 MethodLinkageName = CGM.getMangledName(Method);
1323 // Get the location for the method.
1324 llvm::DIFile *MethodDefUnit = nullptr;
1325 unsigned MethodLine = 0;
1326 if (!Method->isImplicit()) {
1327 MethodDefUnit = getOrCreateFile(Method->getLocation());
1328 MethodLine = getLineNumber(Method->getLocation());
1331 // Collect virtual method info.
1332 llvm::DIType *ContainingType = nullptr;
1333 unsigned Virtuality = 0;
1334 unsigned VIndex = 0;
1335 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
1336 int ThisAdjustment = 0;
1338 if (Method->isVirtual()) {
1339 if (Method->isPure())
1340 Virtuality = llvm::dwarf::DW_VIRTUALITY_pure_virtual;
1342 Virtuality = llvm::dwarf::DW_VIRTUALITY_virtual;
1344 if (CGM.getTarget().getCXXABI().isItaniumFamily()) {
1345 // It doesn't make sense to give a virtual destructor a vtable index,
1346 // since a single destructor has two entries in the vtable.
1347 if (!isa<CXXDestructorDecl>(Method))
1348 VIndex = CGM.getItaniumVTableContext().getMethodVTableIndex(Method);
1350 // Emit MS ABI vftable information. There is only one entry for the
1352 const auto *DD = dyn_cast<CXXDestructorDecl>(Method);
1353 GlobalDecl GD = DD ? GlobalDecl(DD, Dtor_Deleting) : GlobalDecl(Method);
1354 MicrosoftVTableContext::MethodVFTableLocation ML =
1355 CGM.getMicrosoftVTableContext().getMethodVFTableLocation(GD);
1358 // CodeView only records the vftable offset in the class that introduces
1359 // the virtual method. This is possible because, unlike Itanium, the MS
1360 // C++ ABI does not include all virtual methods from non-primary bases in
1361 // the vtable for the most derived class. For example, if C inherits from
1362 // A and B, C's primary vftable will not include B's virtual methods.
1363 if (Method->begin_overridden_methods() == Method->end_overridden_methods())
1364 Flags |= llvm::DINode::FlagIntroducedVirtual;
1366 // The 'this' adjustment accounts for both the virtual and non-virtual
1367 // portions of the adjustment. Presumably the debugger only uses it when
1368 // it knows the dynamic type of an object.
1369 ThisAdjustment = CGM.getCXXABI()
1370 .getVirtualFunctionPrologueThisAdjustment(GD)
1373 ContainingType = RecordTy;
1376 if (Method->isImplicit())
1377 Flags |= llvm::DINode::FlagArtificial;
1378 Flags |= getAccessFlag(Method->getAccess(), Method->getParent());
1379 if (const auto *CXXC = dyn_cast<CXXConstructorDecl>(Method)) {
1380 if (CXXC->isExplicit())
1381 Flags |= llvm::DINode::FlagExplicit;
1382 } else if (const auto *CXXC = dyn_cast<CXXConversionDecl>(Method)) {
1383 if (CXXC->isExplicit())
1384 Flags |= llvm::DINode::FlagExplicit;
1386 if (Method->hasPrototype())
1387 Flags |= llvm::DINode::FlagPrototyped;
1388 if (Method->getRefQualifier() == RQ_LValue)
1389 Flags |= llvm::DINode::FlagLValueReference;
1390 if (Method->getRefQualifier() == RQ_RValue)
1391 Flags |= llvm::DINode::FlagRValueReference;
1393 llvm::DINodeArray TParamsArray = CollectFunctionTemplateParams(Method, Unit);
1394 llvm::DISubprogram *SP = DBuilder.createMethod(
1395 RecordTy, MethodName, MethodLinkageName, MethodDefUnit, MethodLine,
1396 MethodTy, /*isLocalToUnit=*/false, /*isDefinition=*/false, Virtuality,
1397 VIndex, ThisAdjustment, ContainingType, Flags, CGM.getLangOpts().Optimize,
1398 TParamsArray.get());
1400 SPCache[Method->getCanonicalDecl()].reset(SP);
1405 void CGDebugInfo::CollectCXXMemberFunctions(
1406 const CXXRecordDecl *RD, llvm::DIFile *Unit,
1407 SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy) {
1409 // Since we want more than just the individual member decls if we
1410 // have templated functions iterate over every declaration to gather
1412 for (const auto *I : RD->decls()) {
1413 const auto *Method = dyn_cast<CXXMethodDecl>(I);
1414 // If the member is implicit, don't add it to the member list. This avoids
1415 // the member being added to type units by LLVM, while still allowing it
1416 // to be emitted into the type declaration/reference inside the compile
1418 // Ditto 'nodebug' methods, for consistency with CodeGenFunction.cpp.
1419 // FIXME: Handle Using(Shadow?)Decls here to create
1420 // DW_TAG_imported_declarations inside the class for base decls brought into
1421 // derived classes. GDB doesn't seem to notice/leverage these when I tried
1422 // it, so I'm not rushing to fix this. (GCC seems to produce them, if
1424 if (!Method || Method->isImplicit() || Method->hasAttr<NoDebugAttr>())
1427 if (Method->getType()->getAs<FunctionProtoType>()->getContainedAutoType())
1430 // Reuse the existing member function declaration if it exists.
1431 // It may be associated with the declaration of the type & should be
1432 // reused as we're building the definition.
1434 // This situation can arise in the vtable-based debug info reduction where
1435 // implicit members are emitted in a non-vtable TU.
1436 auto MI = SPCache.find(Method->getCanonicalDecl());
1437 EltTys.push_back(MI == SPCache.end()
1438 ? CreateCXXMemberFunction(Method, Unit, RecordTy)
1439 : static_cast<llvm::Metadata *>(MI->second));
1443 void CGDebugInfo::CollectCXXBases(const CXXRecordDecl *RD, llvm::DIFile *Unit,
1444 SmallVectorImpl<llvm::Metadata *> &EltTys,
1445 llvm::DIType *RecordTy) {
1446 llvm::DenseSet<CanonicalDeclPtr<const CXXRecordDecl>> SeenTypes;
1447 CollectCXXBasesAux(RD, Unit, EltTys, RecordTy, RD->bases(), SeenTypes,
1448 llvm::DINode::FlagZero);
1450 // If we are generating CodeView debug info, we also need to emit records for
1451 // indirect virtual base classes.
1452 if (CGM.getCodeGenOpts().EmitCodeView) {
1453 CollectCXXBasesAux(RD, Unit, EltTys, RecordTy, RD->vbases(), SeenTypes,
1454 llvm::DINode::FlagIndirectVirtualBase);
1458 void CGDebugInfo::CollectCXXBasesAux(
1459 const CXXRecordDecl *RD, llvm::DIFile *Unit,
1460 SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy,
1461 const CXXRecordDecl::base_class_const_range &Bases,
1462 llvm::DenseSet<CanonicalDeclPtr<const CXXRecordDecl>> &SeenTypes,
1463 llvm::DINode::DIFlags StartingFlags) {
1464 const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1465 for (const auto &BI : Bases) {
1467 cast<CXXRecordDecl>(BI.getType()->getAs<RecordType>()->getDecl());
1468 if (!SeenTypes.insert(Base).second)
1470 auto *BaseTy = getOrCreateType(BI.getType(), Unit);
1471 llvm::DINode::DIFlags BFlags = StartingFlags;
1472 uint64_t BaseOffset;
1474 if (BI.isVirtual()) {
1475 if (CGM.getTarget().getCXXABI().isItaniumFamily()) {
1476 // virtual base offset offset is -ve. The code generator emits dwarf
1477 // expression where it expects +ve number.
1478 BaseOffset = 0 - CGM.getItaniumVTableContext()
1479 .getVirtualBaseOffsetOffset(RD, Base)
1482 // In the MS ABI, store the vbtable offset, which is analogous to the
1483 // vbase offset offset in Itanium.
1485 4 * CGM.getMicrosoftVTableContext().getVBTableIndex(RD, Base);
1487 BFlags |= llvm::DINode::FlagVirtual;
1489 BaseOffset = CGM.getContext().toBits(RL.getBaseClassOffset(Base));
1490 // FIXME: Inconsistent units for BaseOffset. It is in bytes when
1491 // BI->isVirtual() and bits when not.
1493 BFlags |= getAccessFlag(BI.getAccessSpecifier(), RD);
1495 DBuilder.createInheritance(RecordTy, BaseTy, BaseOffset, BFlags);
1496 EltTys.push_back(DTy);
1501 CGDebugInfo::CollectTemplateParams(const TemplateParameterList *TPList,
1502 ArrayRef<TemplateArgument> TAList,
1503 llvm::DIFile *Unit) {
1504 SmallVector<llvm::Metadata *, 16> TemplateParams;
1505 for (unsigned i = 0, e = TAList.size(); i != e; ++i) {
1506 const TemplateArgument &TA = TAList[i];
1509 Name = TPList->getParam(i)->getName();
1510 switch (TA.getKind()) {
1511 case TemplateArgument::Type: {
1512 llvm::DIType *TTy = getOrCreateType(TA.getAsType(), Unit);
1513 TemplateParams.push_back(
1514 DBuilder.createTemplateTypeParameter(TheCU, Name, TTy));
1516 case TemplateArgument::Integral: {
1517 llvm::DIType *TTy = getOrCreateType(TA.getIntegralType(), Unit);
1518 TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1520 llvm::ConstantInt::get(CGM.getLLVMContext(), TA.getAsIntegral())));
1522 case TemplateArgument::Declaration: {
1523 const ValueDecl *D = TA.getAsDecl();
1524 QualType T = TA.getParamTypeForDecl().getDesugaredType(CGM.getContext());
1525 llvm::DIType *TTy = getOrCreateType(T, Unit);
1526 llvm::Constant *V = nullptr;
1527 const CXXMethodDecl *MD;
1528 // Variable pointer template parameters have a value that is the address
1530 if (const auto *VD = dyn_cast<VarDecl>(D))
1531 V = CGM.GetAddrOfGlobalVar(VD);
1532 // Member function pointers have special support for building them, though
1533 // this is currently unsupported in LLVM CodeGen.
1534 else if ((MD = dyn_cast<CXXMethodDecl>(D)) && MD->isInstance())
1535 V = CGM.getCXXABI().EmitMemberFunctionPointer(MD);
1536 else if (const auto *FD = dyn_cast<FunctionDecl>(D))
1537 V = CGM.GetAddrOfFunction(FD);
1538 // Member data pointers have special handling too to compute the fixed
1539 // offset within the object.
1540 else if (const auto *MPT = dyn_cast<MemberPointerType>(T.getTypePtr())) {
1541 // These five lines (& possibly the above member function pointer
1542 // handling) might be able to be refactored to use similar code in
1543 // CodeGenModule::getMemberPointerConstant
1544 uint64_t fieldOffset = CGM.getContext().getFieldOffset(D);
1546 CGM.getContext().toCharUnitsFromBits((int64_t)fieldOffset);
1547 V = CGM.getCXXABI().EmitMemberDataPointer(MPT, chars);
1549 TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1551 cast_or_null<llvm::Constant>(V->stripPointerCasts())));
1553 case TemplateArgument::NullPtr: {
1554 QualType T = TA.getNullPtrType();
1555 llvm::DIType *TTy = getOrCreateType(T, Unit);
1556 llvm::Constant *V = nullptr;
1557 // Special case member data pointer null values since they're actually -1
1559 if (const auto *MPT = dyn_cast<MemberPointerType>(T.getTypePtr()))
1560 // But treat member function pointers as simple zero integers because
1561 // it's easier than having a special case in LLVM's CodeGen. If LLVM
1562 // CodeGen grows handling for values of non-null member function
1563 // pointers then perhaps we could remove this special case and rely on
1564 // EmitNullMemberPointer for member function pointers.
1565 if (MPT->isMemberDataPointer())
1566 V = CGM.getCXXABI().EmitNullMemberPointer(MPT);
1568 V = llvm::ConstantInt::get(CGM.Int8Ty, 0);
1569 TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1570 TheCU, Name, TTy, V));
1572 case TemplateArgument::Template:
1573 TemplateParams.push_back(DBuilder.createTemplateTemplateParameter(
1574 TheCU, Name, nullptr,
1575 TA.getAsTemplate().getAsTemplateDecl()->getQualifiedNameAsString()));
1577 case TemplateArgument::Pack:
1578 TemplateParams.push_back(DBuilder.createTemplateParameterPack(
1579 TheCU, Name, nullptr,
1580 CollectTemplateParams(nullptr, TA.getPackAsArray(), Unit)));
1582 case TemplateArgument::Expression: {
1583 const Expr *E = TA.getAsExpr();
1584 QualType T = E->getType();
1586 T = CGM.getContext().getLValueReferenceType(T);
1587 llvm::Constant *V = CGM.EmitConstantExpr(E, T);
1588 assert(V && "Expression in template argument isn't constant");
1589 llvm::DIType *TTy = getOrCreateType(T, Unit);
1590 TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1591 TheCU, Name, TTy, V->stripPointerCasts()));
1593 // And the following should never occur:
1594 case TemplateArgument::TemplateExpansion:
1595 case TemplateArgument::Null:
1597 "These argument types shouldn't exist in concrete types");
1600 return DBuilder.getOrCreateArray(TemplateParams);
1604 CGDebugInfo::CollectFunctionTemplateParams(const FunctionDecl *FD,
1605 llvm::DIFile *Unit) {
1606 if (FD->getTemplatedKind() ==
1607 FunctionDecl::TK_FunctionTemplateSpecialization) {
1608 const TemplateParameterList *TList = FD->getTemplateSpecializationInfo()
1610 ->getTemplateParameters();
1611 return CollectTemplateParams(
1612 TList, FD->getTemplateSpecializationArgs()->asArray(), Unit);
1614 return llvm::DINodeArray();
1617 llvm::DINodeArray CGDebugInfo::CollectCXXTemplateParams(
1618 const ClassTemplateSpecializationDecl *TSpecial, llvm::DIFile *Unit) {
1619 // Always get the full list of parameters, not just the ones from
1620 // the specialization.
1621 TemplateParameterList *TPList =
1622 TSpecial->getSpecializedTemplate()->getTemplateParameters();
1623 const TemplateArgumentList &TAList = TSpecial->getTemplateArgs();
1624 return CollectTemplateParams(TPList, TAList.asArray(), Unit);
1627 llvm::DIType *CGDebugInfo::getOrCreateVTablePtrType(llvm::DIFile *Unit) {
1629 return VTablePtrType;
1631 ASTContext &Context = CGM.getContext();
1634 llvm::Metadata *STy = getOrCreateType(Context.IntTy, Unit);
1635 llvm::DITypeRefArray SElements = DBuilder.getOrCreateTypeArray(STy);
1636 llvm::DIType *SubTy = DBuilder.createSubroutineType(SElements);
1637 unsigned Size = Context.getTypeSize(Context.VoidPtrTy);
1638 unsigned VtblPtrAddressSpace = CGM.getTarget().getVtblPtrAddressSpace();
1639 Optional<unsigned> DWARFAddressSpace =
1640 CGM.getTarget().getDWARFAddressSpace(VtblPtrAddressSpace);
1642 llvm::DIType *vtbl_ptr_type =
1643 DBuilder.createPointerType(SubTy, Size, 0, DWARFAddressSpace,
1645 VTablePtrType = DBuilder.createPointerType(vtbl_ptr_type, Size);
1646 return VTablePtrType;
1649 StringRef CGDebugInfo::getVTableName(const CXXRecordDecl *RD) {
1650 // Copy the gdb compatible name on the side and use its reference.
1651 return internString("_vptr$", RD->getNameAsString());
1654 void CGDebugInfo::CollectVTableInfo(const CXXRecordDecl *RD, llvm::DIFile *Unit,
1655 SmallVectorImpl<llvm::Metadata *> &EltTys,
1656 llvm::DICompositeType *RecordTy) {
1657 // If this class is not dynamic then there is not any vtable info to collect.
1658 if (!RD->isDynamicClass())
1661 // Don't emit any vtable shape or vptr info if this class doesn't have an
1662 // extendable vfptr. This can happen if the class doesn't have virtual
1663 // methods, or in the MS ABI if those virtual methods only come from virtually
1665 const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1666 if (!RL.hasExtendableVFPtr())
1669 // CodeView needs to know how large the vtable of every dynamic class is, so
1670 // emit a special named pointer type into the element list. The vptr type
1671 // points to this type as well.
1672 llvm::DIType *VPtrTy = nullptr;
1673 bool NeedVTableShape = CGM.getCodeGenOpts().EmitCodeView &&
1674 CGM.getTarget().getCXXABI().isMicrosoft();
1675 if (NeedVTableShape) {
1677 CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
1678 const VTableLayout &VFTLayout =
1679 CGM.getMicrosoftVTableContext().getVFTableLayout(RD, CharUnits::Zero());
1680 unsigned VSlotCount =
1681 VFTLayout.vtable_components().size() - CGM.getLangOpts().RTTIData;
1682 unsigned VTableWidth = PtrWidth * VSlotCount;
1683 unsigned VtblPtrAddressSpace = CGM.getTarget().getVtblPtrAddressSpace();
1684 Optional<unsigned> DWARFAddressSpace =
1685 CGM.getTarget().getDWARFAddressSpace(VtblPtrAddressSpace);
1687 // Create a very wide void* type and insert it directly in the element list.
1688 llvm::DIType *VTableType =
1689 DBuilder.createPointerType(nullptr, VTableWidth, 0, DWARFAddressSpace,
1691 EltTys.push_back(VTableType);
1693 // The vptr is a pointer to this special vtable type.
1694 VPtrTy = DBuilder.createPointerType(VTableType, PtrWidth);
1697 // If there is a primary base then the artificial vptr member lives there.
1698 if (RL.getPrimaryBase())
1702 VPtrTy = getOrCreateVTablePtrType(Unit);
1704 unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
1705 llvm::DIType *VPtrMember = DBuilder.createMemberType(
1706 Unit, getVTableName(RD), Unit, 0, Size, 0, 0,
1707 llvm::DINode::FlagArtificial, VPtrTy);
1708 EltTys.push_back(VPtrMember);
1711 llvm::DIType *CGDebugInfo::getOrCreateRecordType(QualType RTy,
1712 SourceLocation Loc) {
1713 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
1714 llvm::DIType *T = getOrCreateType(RTy, getOrCreateFile(Loc));
1718 llvm::DIType *CGDebugInfo::getOrCreateInterfaceType(QualType D,
1719 SourceLocation Loc) {
1720 return getOrCreateStandaloneType(D, Loc);
1723 llvm::DIType *CGDebugInfo::getOrCreateStandaloneType(QualType D,
1724 SourceLocation Loc) {
1725 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
1726 assert(!D.isNull() && "null type");
1727 llvm::DIType *T = getOrCreateType(D, getOrCreateFile(Loc));
1728 assert(T && "could not create debug info for type");
1730 RetainedTypes.push_back(D.getAsOpaquePtr());
1734 void CGDebugInfo::completeType(const EnumDecl *ED) {
1735 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
1737 QualType Ty = CGM.getContext().getEnumType(ED);
1738 void *TyPtr = Ty.getAsOpaquePtr();
1739 auto I = TypeCache.find(TyPtr);
1740 if (I == TypeCache.end() || !cast<llvm::DIType>(I->second)->isForwardDecl())
1742 llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<EnumType>());
1743 assert(!Res->isForwardDecl());
1744 TypeCache[TyPtr].reset(Res);
1747 void CGDebugInfo::completeType(const RecordDecl *RD) {
1748 if (DebugKind > codegenoptions::LimitedDebugInfo ||
1749 !CGM.getLangOpts().CPlusPlus)
1750 completeRequiredType(RD);
1753 /// Return true if the class or any of its methods are marked dllimport.
1754 static bool isClassOrMethodDLLImport(const CXXRecordDecl *RD) {
1755 if (RD->hasAttr<DLLImportAttr>())
1757 for (const CXXMethodDecl *MD : RD->methods())
1758 if (MD->hasAttr<DLLImportAttr>())
1763 void CGDebugInfo::completeClassData(const RecordDecl *RD) {
1764 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD))
1765 if (CXXRD->isDynamicClass() &&
1766 CGM.getVTableLinkage(CXXRD) ==
1767 llvm::GlobalValue::AvailableExternallyLinkage &&
1768 !isClassOrMethodDLLImport(CXXRD))
1773 void CGDebugInfo::completeClass(const RecordDecl *RD) {
1774 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
1776 QualType Ty = CGM.getContext().getRecordType(RD);
1777 void *TyPtr = Ty.getAsOpaquePtr();
1778 auto I = TypeCache.find(TyPtr);
1779 if (I != TypeCache.end() && !cast<llvm::DIType>(I->second)->isForwardDecl())
1781 llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<RecordType>());
1782 assert(!Res->isForwardDecl());
1783 TypeCache[TyPtr].reset(Res);
1786 static bool hasExplicitMemberDefinition(CXXRecordDecl::method_iterator I,
1787 CXXRecordDecl::method_iterator End) {
1788 for (CXXMethodDecl *MD : llvm::make_range(I, End))
1789 if (FunctionDecl *Tmpl = MD->getInstantiatedFromMemberFunction())
1790 if (!Tmpl->isImplicit() && Tmpl->isThisDeclarationADefinition() &&
1791 !MD->getMemberSpecializationInfo()->isExplicitSpecialization())
1796 /// Does a type definition exist in an imported clang module?
1797 static bool isDefinedInClangModule(const RecordDecl *RD) {
1798 // Only definitions that where imported from an AST file come from a module.
1799 if (!RD || !RD->isFromASTFile())
1801 // Anonymous entities cannot be addressed. Treat them as not from module.
1802 if (!RD->isExternallyVisible() && RD->getName().empty())
1804 if (auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD)) {
1805 if (!CXXDecl->isCompleteDefinition())
1807 auto TemplateKind = CXXDecl->getTemplateSpecializationKind();
1808 if (TemplateKind != TSK_Undeclared) {
1809 // This is a template, check the origin of the first member.
1810 if (CXXDecl->field_begin() == CXXDecl->field_end())
1811 return TemplateKind == TSK_ExplicitInstantiationDeclaration;
1812 if (!CXXDecl->field_begin()->isFromASTFile())
1819 static bool shouldOmitDefinition(codegenoptions::DebugInfoKind DebugKind,
1820 bool DebugTypeExtRefs, const RecordDecl *RD,
1821 const LangOptions &LangOpts) {
1822 if (DebugTypeExtRefs && isDefinedInClangModule(RD->getDefinition()))
1825 if (auto *ES = RD->getASTContext().getExternalSource())
1826 if (ES->hasExternalDefinitions(RD) == ExternalASTSource::EK_Always)
1829 if (DebugKind > codegenoptions::LimitedDebugInfo)
1832 if (!LangOpts.CPlusPlus)
1835 if (!RD->isCompleteDefinitionRequired())
1838 const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
1843 // Only emit complete debug info for a dynamic class when its vtable is
1844 // emitted. However, Microsoft debuggers don't resolve type information
1845 // across DLL boundaries, so skip this optimization if the class or any of its
1846 // methods are marked dllimport. This isn't a complete solution, since objects
1847 // without any dllimport methods can be used in one DLL and constructed in
1848 // another, but it is the current behavior of LimitedDebugInfo.
1849 if (CXXDecl->hasDefinition() && CXXDecl->isDynamicClass() &&
1850 !isClassOrMethodDLLImport(CXXDecl))
1853 TemplateSpecializationKind Spec = TSK_Undeclared;
1854 if (const auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(RD))
1855 Spec = SD->getSpecializationKind();
1857 if (Spec == TSK_ExplicitInstantiationDeclaration &&
1858 hasExplicitMemberDefinition(CXXDecl->method_begin(),
1859 CXXDecl->method_end()))
1865 void CGDebugInfo::completeRequiredType(const RecordDecl *RD) {
1866 if (shouldOmitDefinition(DebugKind, DebugTypeExtRefs, RD, CGM.getLangOpts()))
1869 QualType Ty = CGM.getContext().getRecordType(RD);
1870 llvm::DIType *T = getTypeOrNull(Ty);
1871 if (T && T->isForwardDecl())
1872 completeClassData(RD);
1875 llvm::DIType *CGDebugInfo::CreateType(const RecordType *Ty) {
1876 RecordDecl *RD = Ty->getDecl();
1877 llvm::DIType *T = cast_or_null<llvm::DIType>(getTypeOrNull(QualType(Ty, 0)));
1878 if (T || shouldOmitDefinition(DebugKind, DebugTypeExtRefs, RD,
1879 CGM.getLangOpts())) {
1881 T = getOrCreateRecordFwdDecl(Ty, getDeclContextDescriptor(RD));
1885 return CreateTypeDefinition(Ty);
1888 llvm::DIType *CGDebugInfo::CreateTypeDefinition(const RecordType *Ty) {
1889 RecordDecl *RD = Ty->getDecl();
1891 // Get overall information about the record type for the debug info.
1892 llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
1894 // Records and classes and unions can all be recursive. To handle them, we
1895 // first generate a debug descriptor for the struct as a forward declaration.
1896 // Then (if it is a definition) we go through and get debug info for all of
1897 // its members. Finally, we create a descriptor for the complete type (which
1898 // may refer to the forward decl if the struct is recursive) and replace all
1899 // uses of the forward declaration with the final definition.
1900 llvm::DICompositeType *FwdDecl = getOrCreateLimitedType(Ty, DefUnit);
1902 const RecordDecl *D = RD->getDefinition();
1903 if (!D || !D->isCompleteDefinition())
1906 if (const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD))
1907 CollectContainingType(CXXDecl, FwdDecl);
1909 // Push the struct on region stack.
1910 LexicalBlockStack.emplace_back(&*FwdDecl);
1911 RegionMap[Ty->getDecl()].reset(FwdDecl);
1913 // Convert all the elements.
1914 SmallVector<llvm::Metadata *, 16> EltTys;
1915 // what about nested types?
1917 // Note: The split of CXXDecl information here is intentional, the
1918 // gdb tests will depend on a certain ordering at printout. The debug
1919 // information offsets are still correct if we merge them all together
1921 const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
1923 CollectCXXBases(CXXDecl, DefUnit, EltTys, FwdDecl);
1924 CollectVTableInfo(CXXDecl, DefUnit, EltTys, FwdDecl);
1927 // Collect data fields (including static variables and any initializers).
1928 CollectRecordFields(RD, DefUnit, EltTys, FwdDecl);
1930 CollectCXXMemberFunctions(CXXDecl, DefUnit, EltTys, FwdDecl);
1932 LexicalBlockStack.pop_back();
1933 RegionMap.erase(Ty->getDecl());
1935 llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
1936 DBuilder.replaceArrays(FwdDecl, Elements);
1938 if (FwdDecl->isTemporary())
1940 llvm::MDNode::replaceWithPermanent(llvm::TempDICompositeType(FwdDecl));
1942 RegionMap[Ty->getDecl()].reset(FwdDecl);
1946 llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectType *Ty,
1947 llvm::DIFile *Unit) {
1948 // Ignore protocols.
1949 return getOrCreateType(Ty->getBaseType(), Unit);
1952 llvm::DIType *CGDebugInfo::CreateType(const ObjCTypeParamType *Ty,
1953 llvm::DIFile *Unit) {
1954 // Ignore protocols.
1955 SourceLocation Loc = Ty->getDecl()->getLocation();
1957 // Use Typedefs to represent ObjCTypeParamType.
1958 return DBuilder.createTypedef(
1959 getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit),
1960 Ty->getDecl()->getName(), getOrCreateFile(Loc), getLineNumber(Loc),
1961 getDeclContextDescriptor(Ty->getDecl()));
1964 /// \return true if Getter has the default name for the property PD.
1965 static bool hasDefaultGetterName(const ObjCPropertyDecl *PD,
1966 const ObjCMethodDecl *Getter) {
1971 assert(Getter->getDeclName().isObjCZeroArgSelector());
1972 return PD->getName() ==
1973 Getter->getDeclName().getObjCSelector().getNameForSlot(0);
1976 /// \return true if Setter has the default name for the property PD.
1977 static bool hasDefaultSetterName(const ObjCPropertyDecl *PD,
1978 const ObjCMethodDecl *Setter) {
1983 assert(Setter->getDeclName().isObjCOneArgSelector());
1984 return SelectorTable::constructSetterName(PD->getName()) ==
1985 Setter->getDeclName().getObjCSelector().getNameForSlot(0);
1988 llvm::DIType *CGDebugInfo::CreateType(const ObjCInterfaceType *Ty,
1989 llvm::DIFile *Unit) {
1990 ObjCInterfaceDecl *ID = Ty->getDecl();
1994 // Return a forward declaration if this type was imported from a clang module,
1995 // and this is not the compile unit with the implementation of the type (which
1996 // may contain hidden ivars).
1997 if (DebugTypeExtRefs && ID->isFromASTFile() && ID->getDefinition() &&
1998 !ID->getImplementation())
1999 return DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
2001 getDeclContextDescriptor(ID), Unit, 0);
2003 // Get overall information about the record type for the debug info.
2004 llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
2005 unsigned Line = getLineNumber(ID->getLocation());
2007 static_cast<llvm::dwarf::SourceLanguage>(TheCU->getSourceLanguage());
2009 // If this is just a forward declaration return a special forward-declaration
2010 // debug type since we won't be able to lay out the entire type.
2011 ObjCInterfaceDecl *Def = ID->getDefinition();
2012 if (!Def || !Def->getImplementation()) {
2013 llvm::DIScope *Mod = getParentModuleOrNull(ID);
2014 llvm::DIType *FwdDecl = DBuilder.createReplaceableCompositeType(
2015 llvm::dwarf::DW_TAG_structure_type, ID->getName(), Mod ? Mod : TheCU,
2016 DefUnit, Line, RuntimeLang);
2017 ObjCInterfaceCache.push_back(ObjCInterfaceCacheEntry(Ty, FwdDecl, Unit));
2021 return CreateTypeDefinition(Ty, Unit);
2025 CGDebugInfo::getOrCreateModuleRef(ExternalASTSource::ASTSourceDescriptor Mod,
2026 bool CreateSkeletonCU) {
2027 // Use the Module pointer as the key into the cache. This is a
2028 // nullptr if the "Module" is a PCH, which is safe because we don't
2029 // support chained PCH debug info, so there can only be a single PCH.
2030 const Module *M = Mod.getModuleOrNull();
2031 auto ModRef = ModuleCache.find(M);
2032 if (ModRef != ModuleCache.end())
2033 return cast<llvm::DIModule>(ModRef->second);
2035 // Macro definitions that were defined with "-D" on the command line.
2036 SmallString<128> ConfigMacros;
2038 llvm::raw_svector_ostream OS(ConfigMacros);
2039 const auto &PPOpts = CGM.getPreprocessorOpts();
2041 // Translate the macro definitions back into a commmand line.
2042 for (auto &M : PPOpts.Macros) {
2045 const std::string &Macro = M.first;
2046 bool Undef = M.second;
2047 OS << "\"-" << (Undef ? 'U' : 'D');
2048 for (char c : Macro)
2050 case '\\' : OS << "\\\\"; break;
2051 case '"' : OS << "\\\""; break;
2058 bool IsRootModule = M ? !M->Parent : true;
2059 if (CreateSkeletonCU && IsRootModule) {
2060 // PCH files don't have a signature field in the control block,
2061 // but LLVM detects skeleton CUs by looking for a non-zero DWO id.
2062 // We use the lower 64 bits for debug info.
2063 uint64_t Signature =
2065 ? (uint64_t)Mod.getSignature()[1] << 32 | Mod.getSignature()[0]
2067 llvm::DIBuilder DIB(CGM.getModule());
2068 DIB.createCompileUnit(TheCU->getSourceLanguage(),
2069 DIB.createFile(Mod.getModuleName(), Mod.getPath()),
2070 TheCU->getProducer(), true, StringRef(), 0,
2071 Mod.getASTFile(), llvm::DICompileUnit::FullDebug,
2075 llvm::DIModule *Parent =
2076 IsRootModule ? nullptr
2077 : getOrCreateModuleRef(
2078 ExternalASTSource::ASTSourceDescriptor(*M->Parent),
2080 llvm::DIModule *DIMod =
2081 DBuilder.createModule(Parent, Mod.getModuleName(), ConfigMacros,
2082 Mod.getPath(), CGM.getHeaderSearchOpts().Sysroot);
2083 ModuleCache[M].reset(DIMod);
2087 llvm::DIType *CGDebugInfo::CreateTypeDefinition(const ObjCInterfaceType *Ty,
2088 llvm::DIFile *Unit) {
2089 ObjCInterfaceDecl *ID = Ty->getDecl();
2090 llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
2091 unsigned Line = getLineNumber(ID->getLocation());
2092 unsigned RuntimeLang = TheCU->getSourceLanguage();
2094 // Bit size, align and offset of the type.
2095 uint64_t Size = CGM.getContext().getTypeSize(Ty);
2096 auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
2098 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
2099 if (ID->getImplementation())
2100 Flags |= llvm::DINode::FlagObjcClassComplete;
2102 llvm::DIScope *Mod = getParentModuleOrNull(ID);
2103 llvm::DICompositeType *RealDecl = DBuilder.createStructType(
2104 Mod ? Mod : Unit, ID->getName(), DefUnit, Line, Size, Align, Flags,
2105 nullptr, llvm::DINodeArray(), RuntimeLang);
2107 QualType QTy(Ty, 0);
2108 TypeCache[QTy.getAsOpaquePtr()].reset(RealDecl);
2110 // Push the struct on region stack.
2111 LexicalBlockStack.emplace_back(RealDecl);
2112 RegionMap[Ty->getDecl()].reset(RealDecl);
2114 // Convert all the elements.
2115 SmallVector<llvm::Metadata *, 16> EltTys;
2117 ObjCInterfaceDecl *SClass = ID->getSuperClass();
2119 llvm::DIType *SClassTy =
2120 getOrCreateType(CGM.getContext().getObjCInterfaceType(SClass), Unit);
2124 llvm::DIType *InhTag = DBuilder.createInheritance(RealDecl, SClassTy, 0,
2125 llvm::DINode::FlagZero);
2126 EltTys.push_back(InhTag);
2129 // Create entries for all of the properties.
2130 auto AddProperty = [&](const ObjCPropertyDecl *PD) {
2131 SourceLocation Loc = PD->getLocation();
2132 llvm::DIFile *PUnit = getOrCreateFile(Loc);
2133 unsigned PLine = getLineNumber(Loc);
2134 ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
2135 ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
2136 llvm::MDNode *PropertyNode = DBuilder.createObjCProperty(
2137 PD->getName(), PUnit, PLine,
2138 hasDefaultGetterName(PD, Getter) ? ""
2139 : getSelectorName(PD->getGetterName()),
2140 hasDefaultSetterName(PD, Setter) ? ""
2141 : getSelectorName(PD->getSetterName()),
2142 PD->getPropertyAttributes(), getOrCreateType(PD->getType(), PUnit));
2143 EltTys.push_back(PropertyNode);
2146 llvm::SmallPtrSet<const IdentifierInfo*, 16> PropertySet;
2147 for (const ObjCCategoryDecl *ClassExt : ID->known_extensions())
2148 for (auto *PD : ClassExt->properties()) {
2149 PropertySet.insert(PD->getIdentifier());
2152 for (const auto *PD : ID->properties()) {
2153 // Don't emit duplicate metadata for properties that were already in a
2155 if (!PropertySet.insert(PD->getIdentifier()).second)
2161 const ASTRecordLayout &RL = CGM.getContext().getASTObjCInterfaceLayout(ID);
2162 unsigned FieldNo = 0;
2163 for (ObjCIvarDecl *Field = ID->all_declared_ivar_begin(); Field;
2164 Field = Field->getNextIvar(), ++FieldNo) {
2165 llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
2169 StringRef FieldName = Field->getName();
2171 // Ignore unnamed fields.
2172 if (FieldName.empty())
2175 // Get the location for the field.
2176 llvm::DIFile *FieldDefUnit = getOrCreateFile(Field->getLocation());
2177 unsigned FieldLine = getLineNumber(Field->getLocation());
2178 QualType FType = Field->getType();
2179 uint64_t FieldSize = 0;
2180 uint32_t FieldAlign = 0;
2182 if (!FType->isIncompleteArrayType()) {
2184 // Bit size, align and offset of the type.
2185 FieldSize = Field->isBitField()
2186 ? Field->getBitWidthValue(CGM.getContext())
2187 : CGM.getContext().getTypeSize(FType);
2188 FieldAlign = getTypeAlignIfRequired(FType, CGM.getContext());
2191 uint64_t FieldOffset;
2192 if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
2193 // We don't know the runtime offset of an ivar if we're using the
2194 // non-fragile ABI. For bitfields, use the bit offset into the first
2195 // byte of storage of the bitfield. For other fields, use zero.
2196 if (Field->isBitField()) {
2198 CGM.getObjCRuntime().ComputeBitfieldBitOffset(CGM, ID, Field);
2199 FieldOffset %= CGM.getContext().getCharWidth();
2204 FieldOffset = RL.getFieldOffset(FieldNo);
2207 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
2208 if (Field->getAccessControl() == ObjCIvarDecl::Protected)
2209 Flags = llvm::DINode::FlagProtected;
2210 else if (Field->getAccessControl() == ObjCIvarDecl::Private)
2211 Flags = llvm::DINode::FlagPrivate;
2212 else if (Field->getAccessControl() == ObjCIvarDecl::Public)
2213 Flags = llvm::DINode::FlagPublic;
2215 llvm::MDNode *PropertyNode = nullptr;
2216 if (ObjCImplementationDecl *ImpD = ID->getImplementation()) {
2217 if (ObjCPropertyImplDecl *PImpD =
2218 ImpD->FindPropertyImplIvarDecl(Field->getIdentifier())) {
2219 if (ObjCPropertyDecl *PD = PImpD->getPropertyDecl()) {
2220 SourceLocation Loc = PD->getLocation();
2221 llvm::DIFile *PUnit = getOrCreateFile(Loc);
2222 unsigned PLine = getLineNumber(Loc);
2223 ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
2224 ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
2225 PropertyNode = DBuilder.createObjCProperty(
2226 PD->getName(), PUnit, PLine,
2227 hasDefaultGetterName(PD, Getter) ? "" : getSelectorName(
2228 PD->getGetterName()),
2229 hasDefaultSetterName(PD, Setter) ? "" : getSelectorName(
2230 PD->getSetterName()),
2231 PD->getPropertyAttributes(),
2232 getOrCreateType(PD->getType(), PUnit));
2236 FieldTy = DBuilder.createObjCIVar(FieldName, FieldDefUnit, FieldLine,
2237 FieldSize, FieldAlign, FieldOffset, Flags,
2238 FieldTy, PropertyNode);
2239 EltTys.push_back(FieldTy);
2242 llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
2243 DBuilder.replaceArrays(RealDecl, Elements);
2245 LexicalBlockStack.pop_back();
2249 llvm::DIType *CGDebugInfo::CreateType(const VectorType *Ty,
2250 llvm::DIFile *Unit) {
2251 llvm::DIType *ElementTy = getOrCreateType(Ty->getElementType(), Unit);
2252 int64_t Count = Ty->getNumElements();
2254 // If number of elements are not known then this is an unbounded array.
2255 // Use Count == -1 to express such arrays.
2258 llvm::Metadata *Subscript = DBuilder.getOrCreateSubrange(0, Count);
2259 llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
2261 uint64_t Size = CGM.getContext().getTypeSize(Ty);
2262 auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
2264 return DBuilder.createVectorType(Size, Align, ElementTy, SubscriptArray);
2267 llvm::DIType *CGDebugInfo::CreateType(const ArrayType *Ty, llvm::DIFile *Unit) {
2271 // FIXME: make getTypeAlign() aware of VLAs and incomplete array types
2272 if (const auto *VAT = dyn_cast<VariableArrayType>(Ty)) {
2274 Align = getTypeAlignIfRequired(CGM.getContext().getBaseElementType(VAT),
2276 } else if (Ty->isIncompleteArrayType()) {
2278 if (Ty->getElementType()->isIncompleteType())
2281 Align = getTypeAlignIfRequired(Ty->getElementType(), CGM.getContext());
2282 } else if (Ty->isIncompleteType()) {
2286 // Size and align of the whole array, not the element type.
2287 Size = CGM.getContext().getTypeSize(Ty);
2288 Align = getTypeAlignIfRequired(Ty, CGM.getContext());
2291 // Add the dimensions of the array. FIXME: This loses CV qualifiers from
2292 // interior arrays, do we care? Why aren't nested arrays represented the
2293 // obvious/recursive way?
2294 SmallVector<llvm::Metadata *, 8> Subscripts;
2295 QualType EltTy(Ty, 0);
2296 while ((Ty = dyn_cast<ArrayType>(EltTy))) {
2297 // If the number of elements is known, then count is that number. Otherwise,
2298 // it's -1. This allows us to represent a subrange with an array of 0
2299 // elements, like this:
2304 int64_t Count = -1; // Count == -1 is an unbounded array.
2305 if (const auto *CAT = dyn_cast<ConstantArrayType>(Ty))
2306 Count = CAT->getSize().getZExtValue();
2307 else if (const auto *VAT = dyn_cast<VariableArrayType>(Ty)) {
2308 if (Expr *Size = VAT->getSizeExpr()) {
2310 if (Size->EvaluateAsInt(V, CGM.getContext()))
2311 Count = V.getExtValue();
2315 // FIXME: Verify this is right for VLAs.
2316 Subscripts.push_back(DBuilder.getOrCreateSubrange(0, Count));
2317 EltTy = Ty->getElementType();
2320 llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscripts);
2322 return DBuilder.createArrayType(Size, Align, getOrCreateType(EltTy, Unit),
2326 llvm::DIType *CGDebugInfo::CreateType(const LValueReferenceType *Ty,
2327 llvm::DIFile *Unit) {
2328 return CreatePointerLikeType(llvm::dwarf::DW_TAG_reference_type, Ty,
2329 Ty->getPointeeType(), Unit);
2332 llvm::DIType *CGDebugInfo::CreateType(const RValueReferenceType *Ty,
2333 llvm::DIFile *Unit) {
2334 return CreatePointerLikeType(llvm::dwarf::DW_TAG_rvalue_reference_type, Ty,
2335 Ty->getPointeeType(), Unit);
2338 llvm::DIType *CGDebugInfo::CreateType(const MemberPointerType *Ty,
2340 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
2343 if (!Ty->isIncompleteType()) {
2344 Size = CGM.getContext().getTypeSize(Ty);
2346 // Set the MS inheritance model. There is no flag for the unspecified model.
2347 if (CGM.getTarget().getCXXABI().isMicrosoft()) {
2348 switch (Ty->getMostRecentCXXRecordDecl()->getMSInheritanceModel()) {
2349 case MSInheritanceAttr::Keyword_single_inheritance:
2350 Flags |= llvm::DINode::FlagSingleInheritance;
2352 case MSInheritanceAttr::Keyword_multiple_inheritance:
2353 Flags |= llvm::DINode::FlagMultipleInheritance;
2355 case MSInheritanceAttr::Keyword_virtual_inheritance:
2356 Flags |= llvm::DINode::FlagVirtualInheritance;
2358 case MSInheritanceAttr::Keyword_unspecified_inheritance:
2364 llvm::DIType *ClassType = getOrCreateType(QualType(Ty->getClass(), 0), U);
2365 if (Ty->isMemberDataPointerType())
2366 return DBuilder.createMemberPointerType(
2367 getOrCreateType(Ty->getPointeeType(), U), ClassType, Size, /*Align=*/0,
2370 const FunctionProtoType *FPT =
2371 Ty->getPointeeType()->getAs<FunctionProtoType>();
2372 return DBuilder.createMemberPointerType(
2373 getOrCreateInstanceMethodType(CGM.getContext().getPointerType(QualType(
2374 Ty->getClass(), FPT->getTypeQuals())),
2376 ClassType, Size, /*Align=*/0, Flags);
2379 llvm::DIType *CGDebugInfo::CreateType(const AtomicType *Ty, llvm::DIFile *U) {
2380 auto *FromTy = getOrCreateType(Ty->getValueType(), U);
2381 return DBuilder.createQualifiedType(llvm::dwarf::DW_TAG_atomic_type, FromTy);
2384 llvm::DIType* CGDebugInfo::CreateType(const PipeType *Ty,
2386 return getOrCreateType(Ty->getElementType(), U);
2389 llvm::DIType *CGDebugInfo::CreateEnumType(const EnumType *Ty) {
2390 const EnumDecl *ED = Ty->getDecl();
2394 if (!ED->getTypeForDecl()->isIncompleteType()) {
2395 Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
2396 Align = getDeclAlignIfRequired(ED, CGM.getContext());
2399 SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
2401 bool isImportedFromModule =
2402 DebugTypeExtRefs && ED->isFromASTFile() && ED->getDefinition();
2404 // If this is just a forward declaration, construct an appropriately
2405 // marked node and just return it.
2406 if (isImportedFromModule || !ED->getDefinition()) {
2407 // Note that it is possible for enums to be created as part of
2408 // their own declcontext. In this case a FwdDecl will be created
2409 // twice. This doesn't cause a problem because both FwdDecls are
2410 // entered into the ReplaceMap: finalize() will replace the first
2411 // FwdDecl with the second and then replace the second with
2413 llvm::DIScope *EDContext = getDeclContextDescriptor(ED);
2414 llvm::DIFile *DefUnit = getOrCreateFile(ED->getLocation());
2415 llvm::TempDIScope TmpContext(DBuilder.createReplaceableCompositeType(
2416 llvm::dwarf::DW_TAG_enumeration_type, "", TheCU, DefUnit, 0));
2418 unsigned Line = getLineNumber(ED->getLocation());
2419 StringRef EDName = ED->getName();
2420 llvm::DIType *RetTy = DBuilder.createReplaceableCompositeType(
2421 llvm::dwarf::DW_TAG_enumeration_type, EDName, EDContext, DefUnit, Line,
2422 0, Size, Align, llvm::DINode::FlagFwdDecl, FullName);
2424 ReplaceMap.emplace_back(
2425 std::piecewise_construct, std::make_tuple(Ty),
2426 std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
2430 return CreateTypeDefinition(Ty);
2433 llvm::DIType *CGDebugInfo::CreateTypeDefinition(const EnumType *Ty) {
2434 const EnumDecl *ED = Ty->getDecl();
2437 if (!ED->getTypeForDecl()->isIncompleteType()) {
2438 Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
2439 Align = getDeclAlignIfRequired(ED, CGM.getContext());
2442 SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
2444 // Create elements for each enumerator.
2445 SmallVector<llvm::Metadata *, 16> Enumerators;
2446 ED = ED->getDefinition();
2447 for (const auto *Enum : ED->enumerators()) {
2448 Enumerators.push_back(DBuilder.createEnumerator(
2449 Enum->getName(), Enum->getInitVal().getSExtValue()));
2452 // Return a CompositeType for the enum itself.
2453 llvm::DINodeArray EltArray = DBuilder.getOrCreateArray(Enumerators);
2455 llvm::DIFile *DefUnit = getOrCreateFile(ED->getLocation());
2456 unsigned Line = getLineNumber(ED->getLocation());
2457 llvm::DIScope *EnumContext = getDeclContextDescriptor(ED);
2458 llvm::DIType *ClassTy =
2459 ED->isFixed() ? getOrCreateType(ED->getIntegerType(), DefUnit) : nullptr;
2460 return DBuilder.createEnumerationType(EnumContext, ED->getName(), DefUnit,
2461 Line, Size, Align, EltArray, ClassTy,
2465 llvm::DIMacro *CGDebugInfo::CreateMacro(llvm::DIMacroFile *Parent,
2466 unsigned MType, SourceLocation LineLoc,
2467 StringRef Name, StringRef Value) {
2468 unsigned Line = LineLoc.isInvalid() ? 0 : getLineNumber(LineLoc);
2469 return DBuilder.createMacro(Parent, Line, MType, Name, Value);
2472 llvm::DIMacroFile *CGDebugInfo::CreateTempMacroFile(llvm::DIMacroFile *Parent,
2473 SourceLocation LineLoc,
2474 SourceLocation FileLoc) {
2475 llvm::DIFile *FName = getOrCreateFile(FileLoc);
2476 unsigned Line = LineLoc.isInvalid() ? 0 : getLineNumber(LineLoc);
2477 return DBuilder.createTempMacroFile(Parent, Line, FName);
2480 static QualType UnwrapTypeForDebugInfo(QualType T, const ASTContext &C) {
2483 Qualifiers InnerQuals = T.getLocalQualifiers();
2484 // Qualifiers::operator+() doesn't like it if you add a Qualifier
2485 // that is already there.
2486 Quals += Qualifiers::removeCommonQualifiers(Quals, InnerQuals);
2487 Quals += InnerQuals;
2489 switch (T->getTypeClass()) {
2491 return C.getQualifiedType(T.getTypePtr(), Quals);
2492 case Type::TemplateSpecialization: {
2493 const auto *Spec = cast<TemplateSpecializationType>(T);
2494 if (Spec->isTypeAlias())
2495 return C.getQualifiedType(T.getTypePtr(), Quals);
2496 T = Spec->desugar();
2499 case Type::TypeOfExpr:
2500 T = cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType();
2503 T = cast<TypeOfType>(T)->getUnderlyingType();
2505 case Type::Decltype:
2506 T = cast<DecltypeType>(T)->getUnderlyingType();
2508 case Type::UnaryTransform:
2509 T = cast<UnaryTransformType>(T)->getUnderlyingType();
2511 case Type::Attributed:
2512 T = cast<AttributedType>(T)->getEquivalentType();
2514 case Type::Elaborated:
2515 T = cast<ElaboratedType>(T)->getNamedType();
2518 T = cast<ParenType>(T)->getInnerType();
2520 case Type::SubstTemplateTypeParm:
2521 T = cast<SubstTemplateTypeParmType>(T)->getReplacementType();
2524 case Type::DeducedTemplateSpecialization: {
2525 QualType DT = cast<DeducedType>(T)->getDeducedType();
2526 assert(!DT.isNull() && "Undeduced types shouldn't reach here.");
2530 case Type::Adjusted:
2532 // Decayed and adjusted types use the adjusted type in LLVM and DWARF.
2533 T = cast<AdjustedType>(T)->getAdjustedType();
2537 assert(T != LastT && "Type unwrapping failed to unwrap!");
2542 llvm::DIType *CGDebugInfo::getTypeOrNull(QualType Ty) {
2544 // Unwrap the type as needed for debug information.
2545 Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
2547 auto it = TypeCache.find(Ty.getAsOpaquePtr());
2548 if (it != TypeCache.end()) {
2549 // Verify that the debug info still exists.
2550 if (llvm::Metadata *V = it->second)
2551 return cast<llvm::DIType>(V);
2557 void CGDebugInfo::completeTemplateDefinition(
2558 const ClassTemplateSpecializationDecl &SD) {
2559 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
2561 completeUnusedClass(SD);
2564 void CGDebugInfo::completeUnusedClass(const CXXRecordDecl &D) {
2565 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
2568 completeClassData(&D);
2569 // In case this type has no member function definitions being emitted, ensure
2571 RetainedTypes.push_back(CGM.getContext().getRecordType(&D).getAsOpaquePtr());
2574 llvm::DIType *CGDebugInfo::getOrCreateType(QualType Ty, llvm::DIFile *Unit) {
2578 // Unwrap the type as needed for debug information.
2579 Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
2581 if (auto *T = getTypeOrNull(Ty))
2584 llvm::DIType *Res = CreateTypeNode(Ty, Unit);
2585 void* TyPtr = Ty.getAsOpaquePtr();
2587 // And update the type cache.
2588 TypeCache[TyPtr].reset(Res);
2593 llvm::DIModule *CGDebugInfo::getParentModuleOrNull(const Decl *D) {
2594 // A forward declaration inside a module header does not belong to the module.
2595 if (isa<RecordDecl>(D) && !cast<RecordDecl>(D)->getDefinition())
2597 if (DebugTypeExtRefs && D->isFromASTFile()) {
2598 // Record a reference to an imported clang module or precompiled header.
2599 auto *Reader = CGM.getContext().getExternalSource();
2600 auto Idx = D->getOwningModuleID();
2601 auto Info = Reader->getSourceDescriptor(Idx);
2603 return getOrCreateModuleRef(*Info, /*SkeletonCU=*/true);
2604 } else if (ClangModuleMap) {
2605 // We are building a clang module or a precompiled header.
2607 // TODO: When D is a CXXRecordDecl or a C++ Enum, the ODR applies
2608 // and it wouldn't be necessary to specify the parent scope
2609 // because the type is already unique by definition (it would look
2610 // like the output of -fno-standalone-debug). On the other hand,
2611 // the parent scope helps a consumer to quickly locate the object
2612 // file where the type's definition is located, so it might be
2613 // best to make this behavior a command line or debugger tuning
2615 FullSourceLoc Loc(D->getLocation(), CGM.getContext().getSourceManager());
2616 if (Module *M = ClangModuleMap->inferModuleFromLocation(Loc)) {
2617 // This is a (sub-)module.
2618 auto Info = ExternalASTSource::ASTSourceDescriptor(*M);
2619 return getOrCreateModuleRef(Info, /*SkeletonCU=*/false);
2621 // This the precompiled header being built.
2622 return getOrCreateModuleRef(PCHDescriptor, /*SkeletonCU=*/false);
2629 llvm::DIType *CGDebugInfo::CreateTypeNode(QualType Ty, llvm::DIFile *Unit) {
2630 // Handle qualifiers, which recursively handles what they refer to.
2631 if (Ty.hasLocalQualifiers())
2632 return CreateQualifiedType(Ty, Unit);
2634 // Work out details of type.
2635 switch (Ty->getTypeClass()) {
2636 #define TYPE(Class, Base)
2637 #define ABSTRACT_TYPE(Class, Base)
2638 #define NON_CANONICAL_TYPE(Class, Base)
2639 #define DEPENDENT_TYPE(Class, Base) case Type::Class:
2640 #include "clang/AST/TypeNodes.def"
2641 llvm_unreachable("Dependent types cannot show up in debug information");
2643 case Type::ExtVector:
2645 return CreateType(cast<VectorType>(Ty), Unit);
2646 case Type::ObjCObjectPointer:
2647 return CreateType(cast<ObjCObjectPointerType>(Ty), Unit);
2648 case Type::ObjCObject:
2649 return CreateType(cast<ObjCObjectType>(Ty), Unit);
2650 case Type::ObjCTypeParam:
2651 return CreateType(cast<ObjCTypeParamType>(Ty), Unit);
2652 case Type::ObjCInterface:
2653 return CreateType(cast<ObjCInterfaceType>(Ty), Unit);
2655 return CreateType(cast<BuiltinType>(Ty));
2657 return CreateType(cast<ComplexType>(Ty));
2659 return CreateType(cast<PointerType>(Ty), Unit);
2660 case Type::BlockPointer:
2661 return CreateType(cast<BlockPointerType>(Ty), Unit);
2663 return CreateType(cast<TypedefType>(Ty), Unit);
2665 return CreateType(cast<RecordType>(Ty));
2667 return CreateEnumType(cast<EnumType>(Ty));
2668 case Type::FunctionProto:
2669 case Type::FunctionNoProto:
2670 return CreateType(cast<FunctionType>(Ty), Unit);
2671 case Type::ConstantArray:
2672 case Type::VariableArray:
2673 case Type::IncompleteArray:
2674 return CreateType(cast<ArrayType>(Ty), Unit);
2676 case Type::LValueReference:
2677 return CreateType(cast<LValueReferenceType>(Ty), Unit);
2678 case Type::RValueReference:
2679 return CreateType(cast<RValueReferenceType>(Ty), Unit);
2681 case Type::MemberPointer:
2682 return CreateType(cast<MemberPointerType>(Ty), Unit);
2685 return CreateType(cast<AtomicType>(Ty), Unit);
2688 return CreateType(cast<PipeType>(Ty), Unit);
2690 case Type::TemplateSpecialization:
2691 return CreateType(cast<TemplateSpecializationType>(Ty), Unit);
2694 case Type::Attributed:
2695 case Type::Adjusted:
2697 case Type::DeducedTemplateSpecialization:
2698 case Type::Elaborated:
2700 case Type::SubstTemplateTypeParm:
2701 case Type::TypeOfExpr:
2703 case Type::Decltype:
2704 case Type::UnaryTransform:
2705 case Type::PackExpansion:
2709 llvm_unreachable("type should have been unwrapped!");
2712 llvm::DICompositeType *CGDebugInfo::getOrCreateLimitedType(const RecordType *Ty,
2713 llvm::DIFile *Unit) {
2714 QualType QTy(Ty, 0);
2716 auto *T = cast_or_null<llvm::DICompositeType>(getTypeOrNull(QTy));
2718 // We may have cached a forward decl when we could have created
2719 // a non-forward decl. Go ahead and create a non-forward decl
2721 if (T && !T->isForwardDecl())
2724 // Otherwise create the type.
2725 llvm::DICompositeType *Res = CreateLimitedType(Ty);
2727 // Propagate members from the declaration to the definition
2728 // CreateType(const RecordType*) will overwrite this with the members in the
2729 // correct order if the full type is needed.
2730 DBuilder.replaceArrays(Res, T ? T->getElements() : llvm::DINodeArray());
2732 // And update the type cache.
2733 TypeCache[QTy.getAsOpaquePtr()].reset(Res);
2737 // TODO: Currently used for context chains when limiting debug info.
2738 llvm::DICompositeType *CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
2739 RecordDecl *RD = Ty->getDecl();
2741 // Get overall information about the record type for the debug info.
2742 llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
2743 unsigned Line = getLineNumber(RD->getLocation());
2744 StringRef RDName = getClassName(RD);
2746 llvm::DIScope *RDContext = getDeclContextDescriptor(RD);
2748 // If we ended up creating the type during the context chain construction,
2749 // just return that.
2750 auto *T = cast_or_null<llvm::DICompositeType>(
2751 getTypeOrNull(CGM.getContext().getRecordType(RD)));
2752 if (T && (!T->isForwardDecl() || !RD->getDefinition()))
2755 // If this is just a forward or incomplete declaration, construct an
2756 // appropriately marked node and just return it.
2757 const RecordDecl *D = RD->getDefinition();
2758 if (!D || !D->isCompleteDefinition())
2759 return getOrCreateRecordFwdDecl(Ty, RDContext);
2761 uint64_t Size = CGM.getContext().getTypeSize(Ty);
2762 auto Align = getDeclAlignIfRequired(D, CGM.getContext());
2764 SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
2766 llvm::DICompositeType *RealDecl = DBuilder.createReplaceableCompositeType(
2767 getTagForRecord(RD), RDName, RDContext, DefUnit, Line, 0, Size, Align,
2768 llvm::DINode::FlagZero, FullName);
2770 // Elements of composite types usually have back to the type, creating
2771 // uniquing cycles. Distinct nodes are more efficient.
2772 switch (RealDecl->getTag()) {
2774 llvm_unreachable("invalid composite type tag");
2776 case llvm::dwarf::DW_TAG_array_type:
2777 case llvm::dwarf::DW_TAG_enumeration_type:
2778 // Array elements and most enumeration elements don't have back references,
2779 // so they don't tend to be involved in uniquing cycles and there is some
2780 // chance of merging them when linking together two modules. Only make
2781 // them distinct if they are ODR-uniqued.
2782 if (FullName.empty())
2785 case llvm::dwarf::DW_TAG_structure_type:
2786 case llvm::dwarf::DW_TAG_union_type:
2787 case llvm::dwarf::DW_TAG_class_type:
2788 // Immediatley resolve to a distinct node.
2790 llvm::MDNode::replaceWithDistinct(llvm::TempDICompositeType(RealDecl));
2794 RegionMap[Ty->getDecl()].reset(RealDecl);
2795 TypeCache[QualType(Ty, 0).getAsOpaquePtr()].reset(RealDecl);
2797 if (const auto *TSpecial = dyn_cast<ClassTemplateSpecializationDecl>(RD))
2798 DBuilder.replaceArrays(RealDecl, llvm::DINodeArray(),
2799 CollectCXXTemplateParams(TSpecial, DefUnit));
2803 void CGDebugInfo::CollectContainingType(const CXXRecordDecl *RD,
2804 llvm::DICompositeType *RealDecl) {
2805 // A class's primary base or the class itself contains the vtable.
2806 llvm::DICompositeType *ContainingType = nullptr;
2807 const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
2808 if (const CXXRecordDecl *PBase = RL.getPrimaryBase()) {
2809 // Seek non-virtual primary base root.
2811 const ASTRecordLayout &BRL = CGM.getContext().getASTRecordLayout(PBase);
2812 const CXXRecordDecl *PBT = BRL.getPrimaryBase();
2813 if (PBT && !BRL.isPrimaryBaseVirtual())
2818 ContainingType = cast<llvm::DICompositeType>(
2819 getOrCreateType(QualType(PBase->getTypeForDecl(), 0),
2820 getOrCreateFile(RD->getLocation())));
2821 } else if (RD->isDynamicClass())
2822 ContainingType = RealDecl;
2824 DBuilder.replaceVTableHolder(RealDecl, ContainingType);
2827 llvm::DIType *CGDebugInfo::CreateMemberType(llvm::DIFile *Unit, QualType FType,
2828 StringRef Name, uint64_t *Offset) {
2829 llvm::DIType *FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
2830 uint64_t FieldSize = CGM.getContext().getTypeSize(FType);
2831 auto FieldAlign = getTypeAlignIfRequired(FType, CGM.getContext());
2833 DBuilder.createMemberType(Unit, Name, Unit, 0, FieldSize, FieldAlign,
2834 *Offset, llvm::DINode::FlagZero, FieldTy);
2835 *Offset += FieldSize;
2839 void CGDebugInfo::collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
2841 StringRef &LinkageName,
2842 llvm::DIScope *&FDContext,
2843 llvm::DINodeArray &TParamsArray,
2844 llvm::DINode::DIFlags &Flags) {
2845 const auto *FD = cast<FunctionDecl>(GD.getDecl());
2846 Name = getFunctionName(FD);
2847 // Use mangled name as linkage name for C/C++ functions.
2848 if (FD->hasPrototype()) {
2849 LinkageName = CGM.getMangledName(GD);
2850 Flags |= llvm::DINode::FlagPrototyped;
2852 // No need to replicate the linkage name if it isn't different from the
2853 // subprogram name, no need to have it at all unless coverage is enabled or
2854 // debug is set to more than just line tables or extra debug info is needed.
2855 if (LinkageName == Name || (!CGM.getCodeGenOpts().EmitGcovArcs &&
2856 !CGM.getCodeGenOpts().EmitGcovNotes &&
2857 !CGM.getCodeGenOpts().DebugInfoForProfiling &&
2858 DebugKind <= codegenoptions::DebugLineTablesOnly))
2859 LinkageName = StringRef();
2861 if (DebugKind >= codegenoptions::LimitedDebugInfo) {
2862 if (const NamespaceDecl *NSDecl =
2863 dyn_cast_or_null<NamespaceDecl>(FD->getDeclContext()))
2864 FDContext = getOrCreateNameSpace(NSDecl);
2865 else if (const RecordDecl *RDecl =
2866 dyn_cast_or_null<RecordDecl>(FD->getDeclContext())) {
2867 llvm::DIScope *Mod = getParentModuleOrNull(RDecl);
2868 FDContext = getContextDescriptor(RDecl, Mod ? Mod : TheCU);
2870 // Check if it is a noreturn-marked function
2871 if (FD->isNoReturn())
2872 Flags |= llvm::DINode::FlagNoReturn;
2873 // Collect template parameters.
2874 TParamsArray = CollectFunctionTemplateParams(FD, Unit);
2878 void CGDebugInfo::collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
2879 unsigned &LineNo, QualType &T,
2880 StringRef &Name, StringRef &LinkageName,
2881 llvm::DIScope *&VDContext) {
2882 Unit = getOrCreateFile(VD->getLocation());
2883 LineNo = getLineNumber(VD->getLocation());
2885 setLocation(VD->getLocation());
2888 if (T->isIncompleteArrayType()) {
2889 // CodeGen turns int[] into int[1] so we'll do the same here.
2890 llvm::APInt ConstVal(32, 1);
2891 QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
2893 T = CGM.getContext().getConstantArrayType(ET, ConstVal,
2894 ArrayType::Normal, 0);
2897 Name = VD->getName();
2898 if (VD->getDeclContext() && !isa<FunctionDecl>(VD->getDeclContext()) &&
2899 !isa<ObjCMethodDecl>(VD->getDeclContext()))
2900 LinkageName = CGM.getMangledName(VD);
2901 if (LinkageName == Name)
2902 LinkageName = StringRef();
2904 // Since we emit declarations (DW_AT_members) for static members, place the
2905 // definition of those static members in the namespace they were declared in
2906 // in the source code (the lexical decl context).
2907 // FIXME: Generalize this for even non-member global variables where the
2908 // declaration and definition may have different lexical decl contexts, once
2909 // we have support for emitting declarations of (non-member) global variables.
2910 const DeclContext *DC = VD->isStaticDataMember() ? VD->getLexicalDeclContext()
2911 : VD->getDeclContext();
2912 // When a record type contains an in-line initialization of a static data
2913 // member, and the record type is marked as __declspec(dllexport), an implicit
2914 // definition of the member will be created in the record context. DWARF
2915 // doesn't seem to have a nice way to describe this in a form that consumers
2916 // are likely to understand, so fake the "normal" situation of a definition
2917 // outside the class by putting it in the global scope.
2919 DC = CGM.getContext().getTranslationUnitDecl();
2921 llvm::DIScope *Mod = getParentModuleOrNull(VD);
2922 VDContext = getContextDescriptor(cast<Decl>(DC), Mod ? Mod : TheCU);
2925 llvm::DISubprogram *CGDebugInfo::getFunctionFwdDeclOrStub(GlobalDecl GD,
2927 llvm::DINodeArray TParamsArray;
2928 StringRef Name, LinkageName;
2929 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
2930 SourceLocation Loc = GD.getDecl()->getLocation();
2931 llvm::DIFile *Unit = getOrCreateFile(Loc);
2932 llvm::DIScope *DContext = Unit;
2933 unsigned Line = getLineNumber(Loc);
2934 collectFunctionDeclProps(GD, Unit, Name, LinkageName, DContext,
2935 TParamsArray, Flags);
2936 auto *FD = dyn_cast<FunctionDecl>(GD.getDecl());
2938 // Build function type.
2939 SmallVector<QualType, 16> ArgTypes;
2941 for (const ParmVarDecl *Parm : FD->parameters())
2942 ArgTypes.push_back(Parm->getType());
2943 CallingConv CC = FD->getType()->castAs<FunctionType>()->getCallConv();
2944 QualType FnType = CGM.getContext().getFunctionType(
2945 FD->getReturnType(), ArgTypes, FunctionProtoType::ExtProtoInfo(CC));
2947 return DBuilder.createFunction(
2948 DContext, Name, LinkageName, Unit, Line,
2949 getOrCreateFunctionType(GD.getDecl(), FnType, Unit),
2950 !FD->isExternallyVisible(),
2951 /* isDefinition = */ true, 0, Flags, CGM.getLangOpts().Optimize,
2952 TParamsArray.get(), getFunctionDeclaration(FD));
2955 llvm::DISubprogram *SP = DBuilder.createTempFunctionFwdDecl(
2956 DContext, Name, LinkageName, Unit, Line,
2957 getOrCreateFunctionType(GD.getDecl(), FnType, Unit),
2958 !FD->isExternallyVisible(),
2959 /* isDefinition = */ false, 0, Flags, CGM.getLangOpts().Optimize,
2960 TParamsArray.get(), getFunctionDeclaration(FD));
2961 const auto *CanonDecl = cast<FunctionDecl>(FD->getCanonicalDecl());
2962 FwdDeclReplaceMap.emplace_back(std::piecewise_construct,
2963 std::make_tuple(CanonDecl),
2964 std::make_tuple(SP));
2968 llvm::DISubprogram *
2969 CGDebugInfo::getFunctionForwardDeclaration(GlobalDecl GD) {
2970 return getFunctionFwdDeclOrStub(GD, /* Stub = */ false);
2973 llvm::DISubprogram *
2974 CGDebugInfo::getFunctionStub(GlobalDecl GD) {
2975 return getFunctionFwdDeclOrStub(GD, /* Stub = */ true);
2978 llvm::DIGlobalVariable *
2979 CGDebugInfo::getGlobalVariableForwardDeclaration(const VarDecl *VD) {
2981 StringRef Name, LinkageName;
2982 SourceLocation Loc = VD->getLocation();
2983 llvm::DIFile *Unit = getOrCreateFile(Loc);
2984 llvm::DIScope *DContext = Unit;
2985 unsigned Line = getLineNumber(Loc);
2987 collectVarDeclProps(VD, Unit, Line, T, Name, LinkageName, DContext);
2988 auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
2989 auto *GV = DBuilder.createTempGlobalVariableFwdDecl(
2990 DContext, Name, LinkageName, Unit, Line, getOrCreateType(T, Unit),
2991 !VD->isExternallyVisible(), nullptr, Align);
2992 FwdDeclReplaceMap.emplace_back(
2993 std::piecewise_construct,
2994 std::make_tuple(cast<VarDecl>(VD->getCanonicalDecl())),
2995 std::make_tuple(static_cast<llvm::Metadata *>(GV)));
2999 llvm::DINode *CGDebugInfo::getDeclarationOrDefinition(const Decl *D) {
3000 // We only need a declaration (not a definition) of the type - so use whatever
3001 // we would otherwise do to get a type for a pointee. (forward declarations in
3002 // limited debug info, full definitions (if the type definition is available)
3003 // in unlimited debug info)
3004 if (const auto *TD = dyn_cast<TypeDecl>(D))
3005 return getOrCreateType(CGM.getContext().getTypeDeclType(TD),
3006 getOrCreateFile(TD->getLocation()));
3007 auto I = DeclCache.find(D->getCanonicalDecl());
3009 if (I != DeclCache.end()) {
3011 if (auto *GVE = dyn_cast_or_null<llvm::DIGlobalVariableExpression>(N))
3012 return GVE->getVariable();
3013 return dyn_cast_or_null<llvm::DINode>(N);
3016 // No definition for now. Emit a forward definition that might be
3017 // merged with a potential upcoming definition.
3018 if (const auto *FD = dyn_cast<FunctionDecl>(D))
3019 return getFunctionForwardDeclaration(FD);
3020 else if (const auto *VD = dyn_cast<VarDecl>(D))
3021 return getGlobalVariableForwardDeclaration(VD);
3026 llvm::DISubprogram *CGDebugInfo::getFunctionDeclaration(const Decl *D) {
3027 if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
3030 const auto *FD = dyn_cast<FunctionDecl>(D);
3035 auto *S = getDeclContextDescriptor(D);
3037 auto MI = SPCache.find(FD->getCanonicalDecl());
3038 if (MI == SPCache.end()) {
3039 if (const auto *MD = dyn_cast<CXXMethodDecl>(FD->getCanonicalDecl())) {
3040 return CreateCXXMemberFunction(MD, getOrCreateFile(MD->getLocation()),
3041 cast<llvm::DICompositeType>(S));
3044 if (MI != SPCache.end()) {
3045 auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
3046 if (SP && !SP->isDefinition())
3050 for (auto NextFD : FD->redecls()) {
3051 auto MI = SPCache.find(NextFD->getCanonicalDecl());
3052 if (MI != SPCache.end()) {
3053 auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
3054 if (SP && !SP->isDefinition())
3061 // getOrCreateFunctionType - Construct type. If it is a c++ method, include
3062 // implicit parameter "this".
3063 llvm::DISubroutineType *CGDebugInfo::getOrCreateFunctionType(const Decl *D,
3066 if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
3067 // Create fake but valid subroutine type. Otherwise -verify would fail, and
3068 // subprogram DIE will miss DW_AT_decl_file and DW_AT_decl_line fields.
3069 return DBuilder.createSubroutineType(DBuilder.getOrCreateTypeArray(None));
3071 if (const auto *Method = dyn_cast<CXXMethodDecl>(D))
3072 return getOrCreateMethodType(Method, F);
3074 const auto *FTy = FnType->getAs<FunctionType>();
3075 CallingConv CC = FTy ? FTy->getCallConv() : CallingConv::CC_C;
3077 if (const auto *OMethod = dyn_cast<ObjCMethodDecl>(D)) {
3078 // Add "self" and "_cmd"
3079 SmallVector<llvm::Metadata *, 16> Elts;
3081 // First element is always return type. For 'void' functions it is NULL.
3082 QualType ResultTy = OMethod->getReturnType();
3084 // Replace the instancetype keyword with the actual type.
3085 if (ResultTy == CGM.getContext().getObjCInstanceType())
3086 ResultTy = CGM.getContext().getPointerType(
3087 QualType(OMethod->getClassInterface()->getTypeForDecl(), 0));
3089 Elts.push_back(getOrCreateType(ResultTy, F));
3090 // "self" pointer is always first argument.
3091 QualType SelfDeclTy;
3092 if (auto *SelfDecl = OMethod->getSelfDecl())
3093 SelfDeclTy = SelfDecl->getType();
3094 else if (auto *FPT = dyn_cast<FunctionProtoType>(FnType))
3095 if (FPT->getNumParams() > 1)
3096 SelfDeclTy = FPT->getParamType(0);
3097 if (!SelfDeclTy.isNull())
3098 Elts.push_back(CreateSelfType(SelfDeclTy, getOrCreateType(SelfDeclTy, F)));
3099 // "_cmd" pointer is always second argument.
3100 Elts.push_back(DBuilder.createArtificialType(
3101 getOrCreateType(CGM.getContext().getObjCSelType(), F)));
3102 // Get rest of the arguments.
3103 for (const auto *PI : OMethod->parameters())
3104 Elts.push_back(getOrCreateType(PI->getType(), F));
3105 // Variadic methods need a special marker at the end of the type list.
3106 if (OMethod->isVariadic())
3107 Elts.push_back(DBuilder.createUnspecifiedParameter());
3109 llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
3110 return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
3114 // Handle variadic function types; they need an additional
3115 // unspecified parameter.
3116 if (const auto *FD = dyn_cast<FunctionDecl>(D))
3117 if (FD->isVariadic()) {
3118 SmallVector<llvm::Metadata *, 16> EltTys;
3119 EltTys.push_back(getOrCreateType(FD->getReturnType(), F));
3120 if (const auto *FPT = dyn_cast<FunctionProtoType>(FnType))
3121 for (QualType ParamType : FPT->param_types())
3122 EltTys.push_back(getOrCreateType(ParamType, F));
3123 EltTys.push_back(DBuilder.createUnspecifiedParameter());
3124 llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
3125 return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
3129 return cast<llvm::DISubroutineType>(getOrCreateType(FnType, F));
3132 void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
3133 SourceLocation ScopeLoc, QualType FnType,
3134 llvm::Function *Fn, CGBuilderTy &Builder) {
3137 StringRef LinkageName;
3139 FnBeginRegionCount.push_back(LexicalBlockStack.size());
3141 const Decl *D = GD.getDecl();
3142 bool HasDecl = (D != nullptr);
3144 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
3145 llvm::DIFile *Unit = getOrCreateFile(Loc);
3146 llvm::DIScope *FDContext = Unit;
3147 llvm::DINodeArray TParamsArray;
3149 // Use llvm function name.
3150 LinkageName = Fn->getName();
3151 } else if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
3152 // If there is a subprogram for this function available then use it.
3153 auto FI = SPCache.find(FD->getCanonicalDecl());
3154 if (FI != SPCache.end()) {
3155 auto *SP = dyn_cast_or_null<llvm::DISubprogram>(FI->second);
3156 if (SP && SP->isDefinition()) {
3157 LexicalBlockStack.emplace_back(SP);
3158 RegionMap[D].reset(SP);
3162 collectFunctionDeclProps(GD, Unit, Name, LinkageName, FDContext,
3163 TParamsArray, Flags);
3164 } else if (const auto *OMD = dyn_cast<ObjCMethodDecl>(D)) {
3165 Name = getObjCMethodName(OMD);
3166 Flags |= llvm::DINode::FlagPrototyped;
3168 // Use llvm function name.
3169 Name = Fn->getName();
3170 Flags |= llvm::DINode::FlagPrototyped;
3172 if (Name.startswith("\01"))
3173 Name = Name.substr(1);
3175 if (!HasDecl || D->isImplicit()) {
3176 Flags |= llvm::DINode::FlagArtificial;
3177 // Artificial functions should not silently reuse CurLoc.
3178 CurLoc = SourceLocation();
3180 unsigned LineNo = getLineNumber(Loc);
3181 unsigned ScopeLine = getLineNumber(ScopeLoc);
3183 // FIXME: The function declaration we're constructing here is mostly reusing
3184 // declarations from CXXMethodDecl and not constructing new ones for arbitrary
3185 // FunctionDecls. When/if we fix this we can have FDContext be TheCU/null for
3186 // all subprograms instead of the actual context since subprogram definitions
3187 // are emitted as CU level entities by the backend.
3188 llvm::DISubprogram *SP = DBuilder.createFunction(
3189 FDContext, Name, LinkageName, Unit, LineNo,
3190 getOrCreateFunctionType(D, FnType, Unit), Fn->hasLocalLinkage(),
3191 true /*definition*/, ScopeLine, Flags, CGM.getLangOpts().Optimize,
3192 TParamsArray.get(), getFunctionDeclaration(D));
3193 Fn->setSubprogram(SP);
3194 // We might get here with a VarDecl in the case we're generating
3195 // code for the initialization of globals. Do not record these decls
3196 // as they will overwrite the actual VarDecl Decl in the cache.
3197 if (HasDecl && isa<FunctionDecl>(D))
3198 DeclCache[D->getCanonicalDecl()].reset(SP);
3200 // Push the function onto the lexical block stack.
3201 LexicalBlockStack.emplace_back(SP);
3204 RegionMap[D].reset(SP);
3207 void CGDebugInfo::EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc,
3210 StringRef LinkageName;
3212 const Decl *D = GD.getDecl();
3216 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
3217 llvm::DIFile *Unit = getOrCreateFile(Loc);
3218 llvm::DIScope *FDContext = getDeclContextDescriptor(D);
3219 llvm::DINodeArray TParamsArray;
3220 if (isa<FunctionDecl>(D)) {
3221 // If there is a DISubprogram for this function available then use it.
3222 collectFunctionDeclProps(GD, Unit, Name, LinkageName, FDContext,
3223 TParamsArray, Flags);
3224 } else if (const auto *OMD = dyn_cast<ObjCMethodDecl>(D)) {
3225 Name = getObjCMethodName(OMD);
3226 Flags |= llvm::DINode::FlagPrototyped;
3228 llvm_unreachable("not a function or ObjC method");
3230 if (!Name.empty() && Name[0] == '\01')
3231 Name = Name.substr(1);
3233 if (D->isImplicit()) {
3234 Flags |= llvm::DINode::FlagArtificial;
3235 // Artificial functions without a location should not silently reuse CurLoc.
3236 if (Loc.isInvalid())
3237 CurLoc = SourceLocation();
3239 unsigned LineNo = getLineNumber(Loc);
3240 unsigned ScopeLine = 0;
3242 DBuilder.retainType(DBuilder.createFunction(
3243 FDContext, Name, LinkageName, Unit, LineNo,
3244 getOrCreateFunctionType(D, FnType, Unit), false /*internalLinkage*/,
3245 false /*definition*/, ScopeLine, Flags, CGM.getLangOpts().Optimize,
3246 TParamsArray.get(), getFunctionDeclaration(D)));
3249 void CGDebugInfo::EmitInlineFunctionStart(CGBuilderTy &Builder, GlobalDecl GD) {
3250 const auto *FD = cast<FunctionDecl>(GD.getDecl());
3251 // If there is a subprogram for this function available then use it.
3252 auto FI = SPCache.find(FD->getCanonicalDecl());
3253 llvm::DISubprogram *SP = nullptr;
3254 if (FI != SPCache.end())
3255 SP = dyn_cast_or_null<llvm::DISubprogram>(FI->second);
3257 SP = getFunctionStub(GD);
3258 FnBeginRegionCount.push_back(LexicalBlockStack.size());
3259 LexicalBlockStack.emplace_back(SP);
3260 setInlinedAt(Builder.getCurrentDebugLocation());
3261 EmitLocation(Builder, FD->getLocation());
3264 void CGDebugInfo::EmitInlineFunctionEnd(CGBuilderTy &Builder) {
3265 assert(CurInlinedAt && "unbalanced inline scope stack");
3266 EmitFunctionEnd(Builder);
3267 setInlinedAt(llvm::DebugLoc(CurInlinedAt).getInlinedAt());
3270 void CGDebugInfo::EmitLocation(CGBuilderTy &Builder, SourceLocation Loc) {
3271 // Update our current location
3274 if (CurLoc.isInvalid() || CurLoc.isMacroID())
3277 llvm::MDNode *Scope = LexicalBlockStack.back();
3278 Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
3279 getLineNumber(CurLoc), getColumnNumber(CurLoc), Scope, CurInlinedAt));
3282 void CGDebugInfo::CreateLexicalBlock(SourceLocation Loc) {
3283 llvm::MDNode *Back = nullptr;
3284 if (!LexicalBlockStack.empty())
3285 Back = LexicalBlockStack.back().get();
3286 LexicalBlockStack.emplace_back(DBuilder.createLexicalBlock(
3287 cast<llvm::DIScope>(Back), getOrCreateFile(CurLoc), getLineNumber(CurLoc),
3288 getColumnNumber(CurLoc)));
3291 void CGDebugInfo::AppendAddressSpaceXDeref(
3292 unsigned AddressSpace,
3293 SmallVectorImpl<int64_t> &Expr) const {
3294 Optional<unsigned> DWARFAddressSpace =
3295 CGM.getTarget().getDWARFAddressSpace(AddressSpace);
3296 if (!DWARFAddressSpace)
3299 Expr.push_back(llvm::dwarf::DW_OP_constu);
3300 Expr.push_back(DWARFAddressSpace.getValue());
3301 Expr.push_back(llvm::dwarf::DW_OP_swap);
3302 Expr.push_back(llvm::dwarf::DW_OP_xderef);
3305 void CGDebugInfo::EmitLexicalBlockStart(CGBuilderTy &Builder,
3306 SourceLocation Loc) {
3307 // Set our current location.
3310 // Emit a line table change for the current location inside the new scope.
3311 Builder.SetCurrentDebugLocation(
3312 llvm::DebugLoc::get(getLineNumber(Loc), getColumnNumber(Loc),
3313 LexicalBlockStack.back(), CurInlinedAt));
3315 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
3318 // Create a new lexical block and push it on the stack.
3319 CreateLexicalBlock(Loc);
3322 void CGDebugInfo::EmitLexicalBlockEnd(CGBuilderTy &Builder,
3323 SourceLocation Loc) {
3324 assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
3326 // Provide an entry in the line table for the end of the block.
3327 EmitLocation(Builder, Loc);
3329 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
3332 LexicalBlockStack.pop_back();
3335 void CGDebugInfo::EmitFunctionEnd(CGBuilderTy &Builder) {
3336 assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
3337 unsigned RCount = FnBeginRegionCount.back();
3338 assert(RCount <= LexicalBlockStack.size() && "Region stack mismatch");
3340 // Pop all regions for this function.
3341 while (LexicalBlockStack.size() != RCount) {
3342 // Provide an entry in the line table for the end of the block.
3343 EmitLocation(Builder, CurLoc);
3344 LexicalBlockStack.pop_back();
3346 FnBeginRegionCount.pop_back();
3349 llvm::DIType *CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
3350 uint64_t *XOffset) {
3352 SmallVector<llvm::Metadata *, 5> EltTys;
3354 uint64_t FieldSize, FieldOffset;
3355 uint32_t FieldAlign;
3357 llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
3358 QualType Type = VD->getType();
3361 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
3362 EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
3363 EltTys.push_back(CreateMemberType(Unit, FType, "__forwarding", &FieldOffset));
3364 FType = CGM.getContext().IntTy;
3365 EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
3366 EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));
3368 bool HasCopyAndDispose = CGM.getContext().BlockRequiresCopying(Type, VD);
3369 if (HasCopyAndDispose) {
3370 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
3372 CreateMemberType(Unit, FType, "__copy_helper", &FieldOffset));
3374 CreateMemberType(Unit, FType, "__destroy_helper", &FieldOffset));
3376 bool HasByrefExtendedLayout;
3377 Qualifiers::ObjCLifetime Lifetime;
3378 if (CGM.getContext().getByrefLifetime(Type, Lifetime,
3379 HasByrefExtendedLayout) &&
3380 HasByrefExtendedLayout) {
3381 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
3383 CreateMemberType(Unit, FType, "__byref_variable_layout", &FieldOffset));
3386 CharUnits Align = CGM.getContext().getDeclAlign(VD);
3387 if (Align > CGM.getContext().toCharUnitsFromBits(
3388 CGM.getTarget().getPointerAlign(0))) {
3389 CharUnits FieldOffsetInBytes =
3390 CGM.getContext().toCharUnitsFromBits(FieldOffset);
3391 CharUnits AlignedOffsetInBytes = FieldOffsetInBytes.alignTo(Align);
3392 CharUnits NumPaddingBytes = AlignedOffsetInBytes - FieldOffsetInBytes;
3394 if (NumPaddingBytes.isPositive()) {
3395 llvm::APInt pad(32, NumPaddingBytes.getQuantity());
3396 FType = CGM.getContext().getConstantArrayType(CGM.getContext().CharTy,
3397 pad, ArrayType::Normal, 0);
3398 EltTys.push_back(CreateMemberType(Unit, FType, "", &FieldOffset));
3403 llvm::DIType *FieldTy = getOrCreateType(FType, Unit);
3404 FieldSize = CGM.getContext().getTypeSize(FType);
3405 FieldAlign = CGM.getContext().toBits(Align);
3407 *XOffset = FieldOffset;
3408 FieldTy = DBuilder.createMemberType(Unit, VD->getName(), Unit, 0, FieldSize,
3409 FieldAlign, FieldOffset,
3410 llvm::DINode::FlagZero, FieldTy);
3411 EltTys.push_back(FieldTy);
3412 FieldOffset += FieldSize;
3414 llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
3416 llvm::DINode::DIFlags Flags = llvm::DINode::FlagBlockByrefStruct;
3418 return DBuilder.createStructType(Unit, "", Unit, 0, FieldOffset, 0, Flags,
3422 void CGDebugInfo::EmitDeclare(const VarDecl *VD, llvm::Value *Storage,
3423 llvm::Optional<unsigned> ArgNo,
3424 CGBuilderTy &Builder) {
3425 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
3426 assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
3427 if (VD->hasAttr<NoDebugAttr>())
3431 VD->isImplicit() || (isa<Decl>(VD->getDeclContext()) &&
3432 cast<Decl>(VD->getDeclContext())->isImplicit());
3433 llvm::DIFile *Unit = nullptr;
3435 Unit = getOrCreateFile(VD->getLocation());
3437 uint64_t XOffset = 0;
3438 if (VD->hasAttr<BlocksAttr>())
3439 Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
3441 Ty = getOrCreateType(VD->getType(), Unit);
3443 // If there is no debug info for this type then do not emit debug info
3444 // for this variable.
3448 // Get location information.
3450 unsigned Column = 0;
3452 Line = getLineNumber(VD->getLocation());
3453 Column = getColumnNumber(VD->getLocation());
3455 SmallVector<int64_t, 13> Expr;
3456 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
3457 if (VD->isImplicit())
3458 Flags |= llvm::DINode::FlagArtificial;
3460 auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
3462 unsigned AddressSpace = CGM.getContext().getTargetAddressSpace(VD->getType());
3463 AppendAddressSpaceXDeref(AddressSpace, Expr);
3465 // If this is the first argument and it is implicit then
3466 // give it an object pointer flag.
3467 // FIXME: There has to be a better way to do this, but for static
3468 // functions there won't be an implicit param at arg1 and
3469 // otherwise it is 'self' or 'this'.
3470 if (isa<ImplicitParamDecl>(VD) && ArgNo && *ArgNo == 1)
3471 Flags |= llvm::DINode::FlagObjectPointer;
3473 // Note: Older versions of clang used to emit byval references with an extra
3474 // DW_OP_deref, because they referenced the IR arg directly instead of
3475 // referencing an alloca. Newer versions of LLVM don't treat allocas
3476 // differently from other function arguments when used in a dbg.declare.
3477 auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
3478 StringRef Name = VD->getName();
3479 if (!Name.empty()) {
3480 if (VD->hasAttr<BlocksAttr>()) {
3481 // Here, we need an offset *into* the alloca.
3482 CharUnits offset = CharUnits::fromQuantity(32);
3483 Expr.push_back(llvm::dwarf::DW_OP_plus);
3484 // offset of __forwarding field
3485 offset = CGM.getContext().toCharUnitsFromBits(
3486 CGM.getTarget().getPointerWidth(0));
3487 Expr.push_back(offset.getQuantity());
3488 Expr.push_back(llvm::dwarf::DW_OP_deref);
3489 Expr.push_back(llvm::dwarf::DW_OP_plus);
3490 // offset of x field
3491 offset = CGM.getContext().toCharUnitsFromBits(XOffset);
3492 Expr.push_back(offset.getQuantity());
3494 } else if (const auto *RT = dyn_cast<RecordType>(VD->getType())) {
3495 // If VD is an anonymous union then Storage represents value for
3496 // all union fields.
3497 const auto *RD = cast<RecordDecl>(RT->getDecl());
3498 if (RD->isUnion() && RD->isAnonymousStructOrUnion()) {
3499 // GDB has trouble finding local variables in anonymous unions, so we emit
3500 // artifical local variables for each of the members.
3502 // FIXME: Remove this code as soon as GDB supports this.
3503 // The debug info verifier in LLVM operates based on the assumption that a
3504 // variable has the same size as its storage and we had to disable the check
3505 // for artificial variables.
3506 for (const auto *Field : RD->fields()) {
3507 llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
3508 StringRef FieldName = Field->getName();
3510 // Ignore unnamed fields. Do not ignore unnamed records.
3511 if (FieldName.empty() && !isa<RecordType>(Field->getType()))
3514 // Use VarDecl's Tag, Scope and Line number.
3515 auto FieldAlign = getDeclAlignIfRequired(Field, CGM.getContext());
3516 auto *D = DBuilder.createAutoVariable(
3517 Scope, FieldName, Unit, Line, FieldTy, CGM.getLangOpts().Optimize,
3518 Flags | llvm::DINode::FlagArtificial, FieldAlign);
3520 // Insert an llvm.dbg.declare into the current block.
3521 DBuilder.insertDeclare(
3522 Storage, D, DBuilder.createExpression(Expr),
3523 llvm::DebugLoc::get(Line, Column, Scope, CurInlinedAt),
3524 Builder.GetInsertBlock());
3529 // Create the descriptor for the variable.
3531 ? DBuilder.createParameterVariable(
3532 Scope, Name, *ArgNo, Unit, Line, Ty,
3533 CGM.getLangOpts().Optimize, Flags)
3534 : DBuilder.createAutoVariable(Scope, Name, Unit, Line, Ty,
3535 CGM.getLangOpts().Optimize, Flags,
3538 // Insert an llvm.dbg.declare into the current block.
3539 DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
3540 llvm::DebugLoc::get(Line, Column, Scope, CurInlinedAt),
3541 Builder.GetInsertBlock());
3544 void CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD,
3545 llvm::Value *Storage,
3546 CGBuilderTy &Builder) {
3547 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
3548 EmitDeclare(VD, Storage, llvm::None, Builder);
3551 llvm::DIType *CGDebugInfo::CreateSelfType(const QualType &QualTy,
3553 llvm::DIType *CachedTy = getTypeOrNull(QualTy);
3556 return DBuilder.createObjectPointerType(Ty);
3559 void CGDebugInfo::EmitDeclareOfBlockDeclRefVariable(
3560 const VarDecl *VD, llvm::Value *Storage, CGBuilderTy &Builder,
3561 const CGBlockInfo &blockInfo, llvm::Instruction *InsertPoint) {
3562 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
3563 assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
3565 if (Builder.GetInsertBlock() == nullptr)
3567 if (VD->hasAttr<NoDebugAttr>())
3570 bool isByRef = VD->hasAttr<BlocksAttr>();
3572 uint64_t XOffset = 0;
3573 llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
3576 Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
3578 Ty = getOrCreateType(VD->getType(), Unit);
3580 // Self is passed along as an implicit non-arg variable in a
3581 // block. Mark it as the object pointer.
3582 if (isa<ImplicitParamDecl>(VD) && VD->getName() == "self")
3583 Ty = CreateSelfType(VD->getType(), Ty);
3585 // Get location information.
3586 unsigned Line = getLineNumber(VD->getLocation());
3587 unsigned Column = getColumnNumber(VD->getLocation());
3589 const llvm::DataLayout &target = CGM.getDataLayout();
3591 CharUnits offset = CharUnits::fromQuantity(
3592 target.getStructLayout(blockInfo.StructureType)
3593 ->getElementOffset(blockInfo.getCapture(VD).getIndex()));
3595 SmallVector<int64_t, 9> addr;
3596 addr.push_back(llvm::dwarf::DW_OP_deref);
3597 addr.push_back(llvm::dwarf::DW_OP_plus);
3598 addr.push_back(offset.getQuantity());
3600 addr.push_back(llvm::dwarf::DW_OP_deref);
3601 addr.push_back(llvm::dwarf::DW_OP_plus);
3602 // offset of __forwarding field
3604 CGM.getContext().toCharUnitsFromBits(target.getPointerSizeInBits(0));
3605 addr.push_back(offset.getQuantity());
3606 addr.push_back(llvm::dwarf::DW_OP_deref);
3607 addr.push_back(llvm::dwarf::DW_OP_plus);
3608 // offset of x field
3609 offset = CGM.getContext().toCharUnitsFromBits(XOffset);
3610 addr.push_back(offset.getQuantity());
3613 // Create the descriptor for the variable.
3614 auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
3615 auto *D = DBuilder.createAutoVariable(
3616 cast<llvm::DILocalScope>(LexicalBlockStack.back()), VD->getName(), Unit,
3617 Line, Ty, false, llvm::DINode::FlagZero, Align);
3619 // Insert an llvm.dbg.declare into the current block.
3621 llvm::DebugLoc::get(Line, Column, LexicalBlockStack.back(), CurInlinedAt);
3622 auto *Expr = DBuilder.createExpression(addr);
3624 DBuilder.insertDeclare(Storage, D, Expr, DL, InsertPoint);
3626 DBuilder.insertDeclare(Storage, D, Expr, DL, Builder.GetInsertBlock());
3629 void CGDebugInfo::EmitDeclareOfArgVariable(const VarDecl *VD, llvm::Value *AI,
3631 CGBuilderTy &Builder) {
3632 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
3633 EmitDeclare(VD, AI, ArgNo, Builder);
3637 struct BlockLayoutChunk {
3638 uint64_t OffsetInBits;
3639 const BlockDecl::Capture *Capture;
3641 bool operator<(const BlockLayoutChunk &l, const BlockLayoutChunk &r) {
3642 return l.OffsetInBits < r.OffsetInBits;
3646 void CGDebugInfo::EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
3649 llvm::Value *LocalAddr,
3650 CGBuilderTy &Builder) {
3651 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
3652 ASTContext &C = CGM.getContext();
3653 const BlockDecl *blockDecl = block.getBlockDecl();
3655 // Collect some general information about the block's location.
3656 SourceLocation loc = blockDecl->getCaretLocation();
3657 llvm::DIFile *tunit = getOrCreateFile(loc);
3658 unsigned line = getLineNumber(loc);
3659 unsigned column = getColumnNumber(loc);
3661 // Build the debug-info type for the block literal.
3662 getDeclContextDescriptor(blockDecl);
3664 const llvm::StructLayout *blockLayout =
3665 CGM.getDataLayout().getStructLayout(block.StructureType);
3667 SmallVector<llvm::Metadata *, 16> fields;
3668 fields.push_back(createFieldType("__isa", C.VoidPtrTy, loc, AS_public,
3669 blockLayout->getElementOffsetInBits(0),
3671 fields.push_back(createFieldType("__flags", C.IntTy, loc, AS_public,
3672 blockLayout->getElementOffsetInBits(1),
3674 fields.push_back(createFieldType("__reserved", C.IntTy, loc, AS_public,
3675 blockLayout->getElementOffsetInBits(2),
3677 auto *FnTy = block.getBlockExpr()->getFunctionType();
3678 auto FnPtrType = CGM.getContext().getPointerType(FnTy->desugar());
3679 fields.push_back(createFieldType("__FuncPtr", FnPtrType, loc, AS_public,
3680 blockLayout->getElementOffsetInBits(3),
3682 fields.push_back(createFieldType(
3683 "__descriptor", C.getPointerType(block.NeedsCopyDispose
3684 ? C.getBlockDescriptorExtendedType()
3685 : C.getBlockDescriptorType()),
3686 loc, AS_public, blockLayout->getElementOffsetInBits(4), tunit, tunit));
3688 // We want to sort the captures by offset, not because DWARF
3689 // requires this, but because we're paranoid about debuggers.
3690 SmallVector<BlockLayoutChunk, 8> chunks;
3693 if (blockDecl->capturesCXXThis()) {
3694 BlockLayoutChunk chunk;
3695 chunk.OffsetInBits =
3696 blockLayout->getElementOffsetInBits(block.CXXThisIndex);
3697 chunk.Capture = nullptr;
3698 chunks.push_back(chunk);
3701 // Variable captures.
3702 for (const auto &capture : blockDecl->captures()) {
3703 const VarDecl *variable = capture.getVariable();
3704 const CGBlockInfo::Capture &captureInfo = block.getCapture(variable);
3706 // Ignore constant captures.
3707 if (captureInfo.isConstant())
3710 BlockLayoutChunk chunk;
3711 chunk.OffsetInBits =
3712 blockLayout->getElementOffsetInBits(captureInfo.getIndex());
3713 chunk.Capture = &capture;
3714 chunks.push_back(chunk);
3718 llvm::array_pod_sort(chunks.begin(), chunks.end());
3720 for (const BlockLayoutChunk &Chunk : chunks) {
3721 uint64_t offsetInBits = Chunk.OffsetInBits;
3722 const BlockDecl::Capture *capture = Chunk.Capture;
3724 // If we have a null capture, this must be the C++ 'this' capture.
3728 cast_or_null<CXXMethodDecl>(blockDecl->getNonClosureContext()))
3729 type = Method->getThisType(C);
3730 else if (auto *RDecl = dyn_cast<CXXRecordDecl>(blockDecl->getParent()))
3731 type = QualType(RDecl->getTypeForDecl(), 0);
3733 llvm_unreachable("unexpected block declcontext");
3735 fields.push_back(createFieldType("this", type, loc, AS_public,
3736 offsetInBits, tunit, tunit));
3740 const VarDecl *variable = capture->getVariable();
3741 StringRef name = variable->getName();
3743 llvm::DIType *fieldType;
3744 if (capture->isByRef()) {
3745 TypeInfo PtrInfo = C.getTypeInfo(C.VoidPtrTy);
3746 auto Align = PtrInfo.AlignIsRequired ? PtrInfo.Align : 0;
3748 // FIXME: this creates a second copy of this type!
3750 fieldType = EmitTypeForVarWithBlocksAttr(variable, &xoffset);
3751 fieldType = DBuilder.createPointerType(fieldType, PtrInfo.Width);
3752 fieldType = DBuilder.createMemberType(tunit, name, tunit, line,
3753 PtrInfo.Width, Align, offsetInBits,
3754 llvm::DINode::FlagZero, fieldType);
3756 auto Align = getDeclAlignIfRequired(variable, CGM.getContext());
3757 fieldType = createFieldType(name, variable->getType(), loc, AS_public,
3758 offsetInBits, Align, tunit, tunit);
3760 fields.push_back(fieldType);
3763 SmallString<36> typeName;
3764 llvm::raw_svector_ostream(typeName) << "__block_literal_"
3765 << CGM.getUniqueBlockCount();
3767 llvm::DINodeArray fieldsArray = DBuilder.getOrCreateArray(fields);
3769 llvm::DIType *type =
3770 DBuilder.createStructType(tunit, typeName.str(), tunit, line,
3771 CGM.getContext().toBits(block.BlockSize), 0,
3772 llvm::DINode::FlagZero, nullptr, fieldsArray);
3773 type = DBuilder.createPointerType(type, CGM.PointerWidthInBits);
3775 // Get overall information about the block.
3776 llvm::DINode::DIFlags flags = llvm::DINode::FlagArtificial;
3777 auto *scope = cast<llvm::DILocalScope>(LexicalBlockStack.back());
3779 // Create the descriptor for the parameter.
3780 auto *debugVar = DBuilder.createParameterVariable(
3781 scope, Arg->getName(), ArgNo, tunit, line, type,
3782 CGM.getLangOpts().Optimize, flags);
3785 // Insert an llvm.dbg.value into the current block.
3786 DBuilder.insertDbgValueIntrinsic(
3787 LocalAddr, 0, debugVar, DBuilder.createExpression(),
3788 llvm::DebugLoc::get(line, column, scope, CurInlinedAt),
3789 Builder.GetInsertBlock());
3792 // Insert an llvm.dbg.declare into the current block.
3793 DBuilder.insertDeclare(Arg, debugVar, DBuilder.createExpression(),
3794 llvm::DebugLoc::get(line, column, scope, CurInlinedAt),
3795 Builder.GetInsertBlock());
3798 llvm::DIDerivedType *
3799 CGDebugInfo::getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D) {
3800 if (!D->isStaticDataMember())
3803 auto MI = StaticDataMemberCache.find(D->getCanonicalDecl());
3804 if (MI != StaticDataMemberCache.end()) {
3805 assert(MI->second && "Static data member declaration should still exist");
3809 // If the member wasn't found in the cache, lazily construct and add it to the
3810 // type (used when a limited form of the type is emitted).
3811 auto DC = D->getDeclContext();
3812 auto *Ctxt = cast<llvm::DICompositeType>(getDeclContextDescriptor(D));
3813 return CreateRecordStaticField(D, Ctxt, cast<RecordDecl>(DC));
3816 llvm::DIGlobalVariableExpression *CGDebugInfo::CollectAnonRecordDecls(
3817 const RecordDecl *RD, llvm::DIFile *Unit, unsigned LineNo,
3818 StringRef LinkageName, llvm::GlobalVariable *Var, llvm::DIScope *DContext) {
3819 llvm::DIGlobalVariableExpression *GVE = nullptr;
3821 for (const auto *Field : RD->fields()) {
3822 llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
3823 StringRef FieldName = Field->getName();
3825 // Ignore unnamed fields, but recurse into anonymous records.
3826 if (FieldName.empty()) {
3827 if (const auto *RT = dyn_cast<RecordType>(Field->getType()))
3828 GVE = CollectAnonRecordDecls(RT->getDecl(), Unit, LineNo, LinkageName,
3832 // Use VarDecl's Tag, Scope and Line number.
3833 GVE = DBuilder.createGlobalVariableExpression(
3834 DContext, FieldName, LinkageName, Unit, LineNo, FieldTy,
3835 Var->hasLocalLinkage());
3836 Var->addDebugInfo(GVE);
3841 void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
3843 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
3844 if (D->hasAttr<NoDebugAttr>())
3847 // If we already created a DIGlobalVariable for this declaration, just attach
3848 // it to the llvm::GlobalVariable.
3849 auto Cached = DeclCache.find(D->getCanonicalDecl());
3850 if (Cached != DeclCache.end())
3851 return Var->addDebugInfo(
3852 cast<llvm::DIGlobalVariableExpression>(Cached->second));
3854 // Create global variable debug descriptor.
3855 llvm::DIFile *Unit = nullptr;
3856 llvm::DIScope *DContext = nullptr;
3858 StringRef DeclName, LinkageName;
3860 collectVarDeclProps(D, Unit, LineNo, T, DeclName, LinkageName, DContext);
3862 // Attempt to store one global variable for the declaration - even if we
3863 // emit a lot of fields.
3864 llvm::DIGlobalVariableExpression *GVE = nullptr;
3866 // If this is an anonymous union then we'll want to emit a global
3867 // variable for each member of the anonymous union so that it's possible
3868 // to find the name of any field in the union.
3869 if (T->isUnionType() && DeclName.empty()) {
3870 const RecordDecl *RD = T->castAs<RecordType>()->getDecl();
3871 assert(RD->isAnonymousStructOrUnion() &&
3872 "unnamed non-anonymous struct or union?");
3873 GVE = CollectAnonRecordDecls(RD, Unit, LineNo, LinkageName, Var, DContext);
3875 auto Align = getDeclAlignIfRequired(D, CGM.getContext());
3877 SmallVector<int64_t, 4> Expr;
3878 unsigned AddressSpace =
3879 CGM.getContext().getTargetAddressSpace(D->getType());
3880 AppendAddressSpaceXDeref(AddressSpace, Expr);
3882 GVE = DBuilder.createGlobalVariableExpression(
3883 DContext, DeclName, LinkageName, Unit, LineNo, getOrCreateType(T, Unit),
3884 Var->hasLocalLinkage(),
3885 Expr.empty() ? nullptr : DBuilder.createExpression(Expr),
3886 getOrCreateStaticDataMemberDeclarationOrNull(D), Align);
3887 Var->addDebugInfo(GVE);
3889 DeclCache[D->getCanonicalDecl()].reset(GVE);
3892 void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD, const APValue &Init) {
3893 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
3894 if (VD->hasAttr<NoDebugAttr>())
3896 auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
3897 // Create the descriptor for the variable.
3898 llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
3899 StringRef Name = VD->getName();
3900 llvm::DIType *Ty = getOrCreateType(VD->getType(), Unit);
3901 if (const auto *ECD = dyn_cast<EnumConstantDecl>(VD)) {
3902 const auto *ED = cast<EnumDecl>(ECD->getDeclContext());
3903 assert(isa<EnumType>(ED->getTypeForDecl()) && "Enum without EnumType?");
3904 Ty = getOrCreateType(QualType(ED->getTypeForDecl(), 0), Unit);
3906 // Do not use global variables for enums.
3909 if (Ty->getTag() == llvm::dwarf::DW_TAG_enumeration_type)
3911 // Do not emit separate definitions for function local const/statics.
3912 if (isa<FunctionDecl>(VD->getDeclContext()))
3914 VD = cast<ValueDecl>(VD->getCanonicalDecl());
3915 auto *VarD = cast<VarDecl>(VD);
3916 if (VarD->isStaticDataMember()) {
3917 auto *RD = cast<RecordDecl>(VarD->getDeclContext());
3918 getDeclContextDescriptor(VarD);
3919 // Ensure that the type is retained even though it's otherwise unreferenced.
3921 // FIXME: This is probably unnecessary, since Ty should reference RD
3922 // through its scope.
3923 RetainedTypes.push_back(
3924 CGM.getContext().getRecordType(RD).getAsOpaquePtr());
3928 llvm::DIScope *DContext = getDeclContextDescriptor(VD);
3930 auto &GV = DeclCache[VD];
3933 llvm::DIExpression *InitExpr = nullptr;
3934 if (CGM.getContext().getTypeSize(VD->getType()) <= 64) {
3935 // FIXME: Add a representation for integer constants wider than 64 bits.
3938 DBuilder.createConstantValueExpression(Init.getInt().getExtValue());
3939 else if (Init.isFloat())
3940 InitExpr = DBuilder.createConstantValueExpression(
3941 Init.getFloat().bitcastToAPInt().getZExtValue());
3943 GV.reset(DBuilder.createGlobalVariableExpression(
3944 DContext, Name, StringRef(), Unit, getLineNumber(VD->getLocation()), Ty,
3945 true, InitExpr, getOrCreateStaticDataMemberDeclarationOrNull(VarD),
3949 llvm::DIScope *CGDebugInfo::getCurrentContextDescriptor(const Decl *D) {
3950 if (!LexicalBlockStack.empty())
3951 return LexicalBlockStack.back();
3952 llvm::DIScope *Mod = getParentModuleOrNull(D);
3953 return getContextDescriptor(D, Mod ? Mod : TheCU);
3956 void CGDebugInfo::EmitUsingDirective(const UsingDirectiveDecl &UD) {
3957 if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
3959 const NamespaceDecl *NSDecl = UD.getNominatedNamespace();
3960 if (!NSDecl->isAnonymousNamespace() ||
3961 CGM.getCodeGenOpts().DebugExplicitImport) {
3962 DBuilder.createImportedModule(
3963 getCurrentContextDescriptor(cast<Decl>(UD.getDeclContext())),
3964 getOrCreateNameSpace(NSDecl),
3965 getLineNumber(UD.getLocation()));
3969 void CGDebugInfo::EmitUsingDecl(const UsingDecl &UD) {
3970 if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
3972 assert(UD.shadow_size() &&
3973 "We shouldn't be codegening an invalid UsingDecl containing no decls");
3974 // Emitting one decl is sufficient - debuggers can detect that this is an
3975 // overloaded name & provide lookup for all the overloads.
3976 const UsingShadowDecl &USD = **UD.shadow_begin();
3978 // FIXME: Skip functions with undeduced auto return type for now since we
3979 // don't currently have the plumbing for separate declarations & definitions
3980 // of free functions and mismatched types (auto in the declaration, concrete
3981 // return type in the definition)
3982 if (const auto *FD = dyn_cast<FunctionDecl>(USD.getUnderlyingDecl()))
3983 if (const auto *AT =
3984 FD->getType()->getAs<FunctionProtoType>()->getContainedAutoType())
3985 if (AT->getDeducedType().isNull())
3987 if (llvm::DINode *Target =
3988 getDeclarationOrDefinition(USD.getUnderlyingDecl()))
3989 DBuilder.createImportedDeclaration(
3990 getCurrentContextDescriptor(cast<Decl>(USD.getDeclContext())), Target,
3991 getLineNumber(USD.getLocation()));
3994 void CGDebugInfo::EmitImportDecl(const ImportDecl &ID) {
3995 if (CGM.getCodeGenOpts().getDebuggerTuning() != llvm::DebuggerKind::LLDB)
3997 if (Module *M = ID.getImportedModule()) {
3998 auto Info = ExternalASTSource::ASTSourceDescriptor(*M);
3999 DBuilder.createImportedDeclaration(
4000 getCurrentContextDescriptor(cast<Decl>(ID.getDeclContext())),
4001 getOrCreateModuleRef(Info, DebugTypeExtRefs),
4002 getLineNumber(ID.getLocation()));
4006 llvm::DIImportedEntity *
4007 CGDebugInfo::EmitNamespaceAlias(const NamespaceAliasDecl &NA) {
4008 if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
4010 auto &VH = NamespaceAliasCache[&NA];
4012 return cast<llvm::DIImportedEntity>(VH);
4013 llvm::DIImportedEntity *R;
4014 if (const auto *Underlying =
4015 dyn_cast<NamespaceAliasDecl>(NA.getAliasedNamespace()))
4016 // This could cache & dedup here rather than relying on metadata deduping.
4017 R = DBuilder.createImportedDeclaration(
4018 getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
4019 EmitNamespaceAlias(*Underlying), getLineNumber(NA.getLocation()),
4022 R = DBuilder.createImportedDeclaration(
4023 getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
4024 getOrCreateNameSpace(cast<NamespaceDecl>(NA.getAliasedNamespace())),
4025 getLineNumber(NA.getLocation()), NA.getName());
4031 CGDebugInfo::getOrCreateNameSpace(const NamespaceDecl *NSDecl) {
4032 NSDecl = NSDecl->getCanonicalDecl();
4033 auto I = NameSpaceCache.find(NSDecl);
4034 if (I != NameSpaceCache.end())
4035 return cast<llvm::DINamespace>(I->second);
4037 unsigned LineNo = getLineNumber(NSDecl->getLocation());
4038 llvm::DIFile *FileD = getOrCreateFile(NSDecl->getLocation());
4039 llvm::DIScope *Context = getDeclContextDescriptor(NSDecl);
4040 llvm::DINamespace *NS = DBuilder.createNameSpace(
4041 Context, NSDecl->getName(), FileD, LineNo, NSDecl->isInline());
4042 NameSpaceCache[NSDecl].reset(NS);
4046 void CGDebugInfo::setDwoId(uint64_t Signature) {
4047 assert(TheCU && "no main compile unit");
4048 TheCU->setDWOId(Signature);
4052 void CGDebugInfo::finalize() {
4053 // Creating types might create further types - invalidating the current
4054 // element and the size(), so don't cache/reference them.
4055 for (size_t i = 0; i != ObjCInterfaceCache.size(); ++i) {
4056 ObjCInterfaceCacheEntry E = ObjCInterfaceCache[i];
4057 llvm::DIType *Ty = E.Type->getDecl()->getDefinition()
4058 ? CreateTypeDefinition(E.Type, E.Unit)
4060 DBuilder.replaceTemporary(llvm::TempDIType(E.Decl), Ty);
4063 for (auto p : ReplaceMap) {
4065 auto *Ty = cast<llvm::DIType>(p.second);
4066 assert(Ty->isForwardDecl());
4068 auto it = TypeCache.find(p.first);
4069 assert(it != TypeCache.end());
4072 DBuilder.replaceTemporary(llvm::TempDIType(Ty),
4073 cast<llvm::DIType>(it->second));
4076 for (const auto &p : FwdDeclReplaceMap) {
4078 llvm::TempMDNode FwdDecl(cast<llvm::MDNode>(p.second));
4079 llvm::Metadata *Repl;
4081 auto it = DeclCache.find(p.first);
4082 // If there has been no definition for the declaration, call RAUW
4083 // with ourselves, that will destroy the temporary MDNode and
4084 // replace it with a standard one, avoiding leaking memory.
4085 if (it == DeclCache.end())
4090 if (auto *GVE = dyn_cast_or_null<llvm::DIGlobalVariableExpression>(Repl))
4091 Repl = GVE->getVariable();
4092 DBuilder.replaceTemporary(std::move(FwdDecl), cast<llvm::MDNode>(Repl));
4095 // We keep our own list of retained types, because we need to look
4096 // up the final type in the type cache.
4097 for (auto &RT : RetainedTypes)
4098 if (auto MD = TypeCache[RT])
4099 DBuilder.retainType(cast<llvm::DIType>(MD));
4101 DBuilder.finalize();
4104 void CGDebugInfo::EmitExplicitCastType(QualType Ty) {
4105 if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
4108 if (auto *DieTy = getOrCreateType(Ty, getOrCreateMainFile()))
4109 // Don't ignore in case of explicit cast where it is referenced indirectly.
4110 DBuilder.retainType(DieTy);
4113 llvm::DebugLoc CGDebugInfo::SourceLocToDebugLoc(SourceLocation Loc) {
4114 if (LexicalBlockStack.empty())
4115 return llvm::DebugLoc();
4117 llvm::MDNode *Scope = LexicalBlockStack.back();
4118 return llvm::DebugLoc::get(
4119 getLineNumber(Loc), getColumnNumber(Loc), Scope);