1 //===--- CGDebugInfo.cpp - Emit Debug Information for a Module ------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This coordinates the debug information generation while generating code.
11 //===----------------------------------------------------------------------===//
13 #include "CGDebugInfo.h"
16 #include "CGObjCRuntime.h"
17 #include "CGRecordLayout.h"
18 #include "CodeGenFunction.h"
19 #include "CodeGenModule.h"
20 #include "ConstantEmitter.h"
21 #include "clang/Analysis/Analyses/ExprMutationAnalyzer.h"
22 #include "clang/AST/ASTContext.h"
23 #include "clang/AST/DeclFriend.h"
24 #include "clang/AST/DeclObjC.h"
25 #include "clang/AST/DeclTemplate.h"
26 #include "clang/AST/Expr.h"
27 #include "clang/AST/RecordLayout.h"
28 #include "clang/Basic/CodeGenOptions.h"
29 #include "clang/Basic/FileManager.h"
30 #include "clang/Basic/SourceManager.h"
31 #include "clang/Basic/Version.h"
32 #include "clang/Frontend/FrontendOptions.h"
33 #include "clang/Lex/HeaderSearchOptions.h"
34 #include "clang/Lex/ModuleMap.h"
35 #include "clang/Lex/PreprocessorOptions.h"
36 #include "llvm/ADT/DenseSet.h"
37 #include "llvm/ADT/SmallVector.h"
38 #include "llvm/ADT/StringExtras.h"
39 #include "llvm/IR/Constants.h"
40 #include "llvm/IR/DataLayout.h"
41 #include "llvm/IR/DerivedTypes.h"
42 #include "llvm/IR/Instructions.h"
43 #include "llvm/IR/Intrinsics.h"
44 #include "llvm/IR/Metadata.h"
45 #include "llvm/IR/Module.h"
46 #include "llvm/Support/FileSystem.h"
47 #include "llvm/Support/MD5.h"
48 #include "llvm/Support/Path.h"
49 using namespace clang;
50 using namespace clang::CodeGen;
52 static uint32_t getTypeAlignIfRequired(const Type *Ty, const ASTContext &Ctx) {
53 auto TI = Ctx.getTypeInfo(Ty);
54 return TI.AlignIsRequired ? TI.Align : 0;
57 static uint32_t getTypeAlignIfRequired(QualType Ty, const ASTContext &Ctx) {
58 return getTypeAlignIfRequired(Ty.getTypePtr(), Ctx);
61 static uint32_t getDeclAlignIfRequired(const Decl *D, const ASTContext &Ctx) {
62 return D->hasAttr<AlignedAttr>() ? D->getMaxAlignment() : 0;
65 CGDebugInfo::CGDebugInfo(CodeGenModule &CGM)
66 : CGM(CGM), DebugKind(CGM.getCodeGenOpts().getDebugInfo()),
67 DebugTypeExtRefs(CGM.getCodeGenOpts().DebugTypeExtRefs),
68 DBuilder(CGM.getModule()) {
69 for (const auto &KV : CGM.getCodeGenOpts().DebugPrefixMap)
70 DebugPrefixMap[KV.first] = KV.second;
74 CGDebugInfo::~CGDebugInfo() {
75 assert(LexicalBlockStack.empty() &&
76 "Region stack mismatch, stack not empty!");
79 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
80 SourceLocation TemporaryLocation)
82 init(TemporaryLocation);
85 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
87 SourceLocation TemporaryLocation)
89 init(TemporaryLocation, DefaultToEmpty);
92 void ApplyDebugLocation::init(SourceLocation TemporaryLocation,
93 bool DefaultToEmpty) {
94 auto *DI = CGF->getDebugInfo();
100 OriginalLocation = CGF->Builder.getCurrentDebugLocation();
102 if (OriginalLocation && !DI->CGM.getExpressionLocationsEnabled())
105 if (TemporaryLocation.isValid()) {
106 DI->EmitLocation(CGF->Builder, TemporaryLocation);
110 if (DefaultToEmpty) {
111 CGF->Builder.SetCurrentDebugLocation(llvm::DebugLoc());
115 // Construct a location that has a valid scope, but no line info.
116 assert(!DI->LexicalBlockStack.empty());
117 CGF->Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
118 0, 0, DI->LexicalBlockStack.back(), DI->getInlinedAt()));
121 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E)
123 init(E->getExprLoc());
126 ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc)
128 if (!CGF.getDebugInfo()) {
132 OriginalLocation = CGF.Builder.getCurrentDebugLocation();
134 CGF.Builder.SetCurrentDebugLocation(std::move(Loc));
137 ApplyDebugLocation::~ApplyDebugLocation() {
138 // Query CGF so the location isn't overwritten when location updates are
139 // temporarily disabled (for C++ default function arguments)
141 CGF->Builder.SetCurrentDebugLocation(std::move(OriginalLocation));
144 ApplyInlineDebugLocation::ApplyInlineDebugLocation(CodeGenFunction &CGF,
145 GlobalDecl InlinedFn)
147 if (!CGF.getDebugInfo()) {
151 auto &DI = *CGF.getDebugInfo();
152 SavedLocation = DI.getLocation();
153 assert((DI.getInlinedAt() ==
154 CGF.Builder.getCurrentDebugLocation()->getInlinedAt()) &&
155 "CGDebugInfo and IRBuilder are out of sync");
157 DI.EmitInlineFunctionStart(CGF.Builder, InlinedFn);
160 ApplyInlineDebugLocation::~ApplyInlineDebugLocation() {
163 auto &DI = *CGF->getDebugInfo();
164 DI.EmitInlineFunctionEnd(CGF->Builder);
165 DI.EmitLocation(CGF->Builder, SavedLocation);
168 void CGDebugInfo::setLocation(SourceLocation Loc) {
169 // If the new location isn't valid return.
173 CurLoc = CGM.getContext().getSourceManager().getExpansionLoc(Loc);
175 // If we've changed files in the middle of a lexical scope go ahead
176 // and create a new lexical scope with file node if it's different
177 // from the one in the scope.
178 if (LexicalBlockStack.empty())
181 SourceManager &SM = CGM.getContext().getSourceManager();
182 auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
183 PresumedLoc PCLoc = SM.getPresumedLoc(CurLoc);
184 if (PCLoc.isInvalid() || Scope->getFile() == getOrCreateFile(CurLoc))
187 if (auto *LBF = dyn_cast<llvm::DILexicalBlockFile>(Scope)) {
188 LexicalBlockStack.pop_back();
189 LexicalBlockStack.emplace_back(DBuilder.createLexicalBlockFile(
190 LBF->getScope(), getOrCreateFile(CurLoc)));
191 } else if (isa<llvm::DILexicalBlock>(Scope) ||
192 isa<llvm::DISubprogram>(Scope)) {
193 LexicalBlockStack.pop_back();
194 LexicalBlockStack.emplace_back(
195 DBuilder.createLexicalBlockFile(Scope, getOrCreateFile(CurLoc)));
199 llvm::DIScope *CGDebugInfo::getDeclContextDescriptor(const Decl *D) {
200 llvm::DIScope *Mod = getParentModuleOrNull(D);
201 return getContextDescriptor(cast<Decl>(D->getDeclContext()),
205 llvm::DIScope *CGDebugInfo::getContextDescriptor(const Decl *Context,
206 llvm::DIScope *Default) {
210 auto I = RegionMap.find(Context);
211 if (I != RegionMap.end()) {
212 llvm::Metadata *V = I->second;
213 return dyn_cast_or_null<llvm::DIScope>(V);
217 if (const auto *NSDecl = dyn_cast<NamespaceDecl>(Context))
218 return getOrCreateNamespace(NSDecl);
220 if (const auto *RDecl = dyn_cast<RecordDecl>(Context))
221 if (!RDecl->isDependentType())
222 return getOrCreateType(CGM.getContext().getTypeDeclType(RDecl),
227 PrintingPolicy CGDebugInfo::getPrintingPolicy() const {
228 PrintingPolicy PP = CGM.getContext().getPrintingPolicy();
230 // If we're emitting codeview, it's important to try to match MSVC's naming so
231 // that visualizers written for MSVC will trigger for our class names. In
232 // particular, we can't have spaces between arguments of standard templates
233 // like basic_string and vector.
234 if (CGM.getCodeGenOpts().EmitCodeView)
235 PP.MSVCFormatting = true;
237 // Apply -fdebug-prefix-map.
238 PP.RemapFilePaths = true;
239 PP.remapPath = [this](StringRef Path) { return remapDIPath(Path); };
243 StringRef CGDebugInfo::getFunctionName(const FunctionDecl *FD) {
244 assert(FD && "Invalid FunctionDecl!");
245 IdentifierInfo *FII = FD->getIdentifier();
246 FunctionTemplateSpecializationInfo *Info =
247 FD->getTemplateSpecializationInfo();
249 // Emit the unqualified name in normal operation. LLVM and the debugger can
250 // compute the fully qualified name from the scope chain. If we're only
251 // emitting line table info, there won't be any scope chains, so emit the
252 // fully qualified name here so that stack traces are more accurate.
253 // FIXME: Do this when emitting DWARF as well as when emitting CodeView after
254 // evaluating the size impact.
255 bool UseQualifiedName = DebugKind == codegenoptions::DebugLineTablesOnly &&
256 CGM.getCodeGenOpts().EmitCodeView;
258 if (!Info && FII && !UseQualifiedName)
259 return FII->getName();
262 llvm::raw_svector_ostream OS(NS);
263 if (!UseQualifiedName)
266 FD->printQualifiedName(OS, getPrintingPolicy());
268 // Add any template specialization args.
270 const TemplateArgumentList *TArgs = Info->TemplateArguments;
271 printTemplateArgumentList(OS, TArgs->asArray(), getPrintingPolicy());
274 // Copy this name on the side and use its reference.
275 return internString(OS.str());
278 StringRef CGDebugInfo::getObjCMethodName(const ObjCMethodDecl *OMD) {
279 SmallString<256> MethodName;
280 llvm::raw_svector_ostream OS(MethodName);
281 OS << (OMD->isInstanceMethod() ? '-' : '+') << '[';
282 const DeclContext *DC = OMD->getDeclContext();
283 if (const auto *OID = dyn_cast<ObjCImplementationDecl>(DC)) {
284 OS << OID->getName();
285 } else if (const auto *OID = dyn_cast<ObjCInterfaceDecl>(DC)) {
286 OS << OID->getName();
287 } else if (const auto *OC = dyn_cast<ObjCCategoryDecl>(DC)) {
288 if (OC->IsClassExtension()) {
289 OS << OC->getClassInterface()->getName();
291 OS << OC->getIdentifier()->getNameStart() << '('
292 << OC->getIdentifier()->getNameStart() << ')';
294 } else if (const auto *OCD = dyn_cast<ObjCCategoryImplDecl>(DC)) {
295 OS << OCD->getClassInterface()->getName() << '(' << OCD->getName() << ')';
296 } else if (isa<ObjCProtocolDecl>(DC)) {
297 // We can extract the type of the class from the self pointer.
298 if (ImplicitParamDecl *SelfDecl = OMD->getSelfDecl()) {
300 cast<ObjCObjectPointerType>(SelfDecl->getType())->getPointeeType();
301 ClassTy.print(OS, PrintingPolicy(LangOptions()));
304 OS << ' ' << OMD->getSelector().getAsString() << ']';
306 return internString(OS.str());
309 StringRef CGDebugInfo::getSelectorName(Selector S) {
310 return internString(S.getAsString());
313 StringRef CGDebugInfo::getClassName(const RecordDecl *RD) {
314 if (isa<ClassTemplateSpecializationDecl>(RD)) {
315 SmallString<128> Name;
316 llvm::raw_svector_ostream OS(Name);
317 RD->getNameForDiagnostic(OS, getPrintingPolicy(),
318 /*Qualified*/ false);
320 // Copy this name on the side and use its reference.
321 return internString(Name);
324 // quick optimization to avoid having to intern strings that are already
325 // stored reliably elsewhere
326 if (const IdentifierInfo *II = RD->getIdentifier())
327 return II->getName();
329 // The CodeView printer in LLVM wants to see the names of unnamed types: it is
330 // used to reconstruct the fully qualified type names.
331 if (CGM.getCodeGenOpts().EmitCodeView) {
332 if (const TypedefNameDecl *D = RD->getTypedefNameForAnonDecl()) {
333 assert(RD->getDeclContext() == D->getDeclContext() &&
334 "Typedef should not be in another decl context!");
335 assert(D->getDeclName().getAsIdentifierInfo() &&
336 "Typedef was not named!");
337 return D->getDeclName().getAsIdentifierInfo()->getName();
340 if (CGM.getLangOpts().CPlusPlus) {
343 ASTContext &Context = CGM.getContext();
344 if (const DeclaratorDecl *DD = Context.getDeclaratorForUnnamedTagDecl(RD))
345 // Anonymous types without a name for linkage purposes have their
346 // declarator mangled in if they have one.
347 Name = DD->getName();
348 else if (const TypedefNameDecl *TND =
349 Context.getTypedefNameForUnnamedTagDecl(RD))
350 // Anonymous types without a name for linkage purposes have their
351 // associate typedef mangled in if they have one.
352 Name = TND->getName();
355 SmallString<256> UnnamedType("<unnamed-type-");
358 return internString(UnnamedType);
366 Optional<llvm::DIFile::ChecksumKind>
367 CGDebugInfo::computeChecksum(FileID FID, SmallString<32> &Checksum) const {
370 if (!CGM.getCodeGenOpts().EmitCodeView &&
371 CGM.getCodeGenOpts().DwarfVersion < 5)
374 SourceManager &SM = CGM.getContext().getSourceManager();
376 const llvm::MemoryBuffer *MemBuffer = SM.getBuffer(FID, &Invalid);
381 llvm::MD5::MD5Result Result;
383 Hash.update(MemBuffer->getBuffer());
386 Hash.stringifyResult(Result, Checksum);
387 return llvm::DIFile::CSK_MD5;
390 Optional<StringRef> CGDebugInfo::getSource(const SourceManager &SM,
392 if (!CGM.getCodeGenOpts().EmbedSource)
395 bool SourceInvalid = false;
396 StringRef Source = SM.getBufferData(FID, &SourceInvalid);
404 llvm::DIFile *CGDebugInfo::getOrCreateFile(SourceLocation Loc) {
406 // If Location is not valid then use main input file.
407 return TheCU->getFile();
409 SourceManager &SM = CGM.getContext().getSourceManager();
410 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
412 StringRef FileName = PLoc.getFilename();
413 if (PLoc.isInvalid() || FileName.empty())
414 // If the location is not valid then use main input file.
415 return TheCU->getFile();
417 // Cache the results.
418 auto It = DIFileCache.find(FileName.data());
419 if (It != DIFileCache.end()) {
420 // Verify that the information still exists.
421 if (llvm::Metadata *V = It->second)
422 return cast<llvm::DIFile>(V);
425 SmallString<32> Checksum;
427 // Compute the checksum if possible. If the location is affected by a #line
428 // directive that refers to a file, PLoc will have an invalid FileID, and we
429 // will correctly get no checksum.
430 Optional<llvm::DIFile::ChecksumKind> CSKind =
431 computeChecksum(PLoc.getFileID(), Checksum);
432 Optional<llvm::DIFile::ChecksumInfo<StringRef>> CSInfo;
434 CSInfo.emplace(*CSKind, Checksum);
435 return createFile(FileName, CSInfo, getSource(SM, SM.getFileID(Loc)));
439 CGDebugInfo::createFile(StringRef FileName,
440 Optional<llvm::DIFile::ChecksumInfo<StringRef>> CSInfo,
441 Optional<StringRef> Source) {
444 std::string RemappedFile = remapDIPath(FileName);
445 std::string CurDir = remapDIPath(getCurrentDirname());
446 SmallString<128> DirBuf;
447 SmallString<128> FileBuf;
448 if (llvm::sys::path::is_absolute(RemappedFile)) {
449 // Strip the common prefix (if it is more than just "/") from current
450 // directory and FileName for a more space-efficient encoding.
451 auto FileIt = llvm::sys::path::begin(RemappedFile);
452 auto FileE = llvm::sys::path::end(RemappedFile);
453 auto CurDirIt = llvm::sys::path::begin(CurDir);
454 auto CurDirE = llvm::sys::path::end(CurDir);
455 for (; CurDirIt != CurDirE && *CurDirIt == *FileIt; ++CurDirIt, ++FileIt)
456 llvm::sys::path::append(DirBuf, *CurDirIt);
457 if (std::distance(llvm::sys::path::begin(CurDir), CurDirIt) == 1) {
458 // Don't strip the common prefix if it is only the root "/"
459 // since that would make LLVM diagnostic locations confusing.
463 for (; FileIt != FileE; ++FileIt)
464 llvm::sys::path::append(FileBuf, *FileIt);
472 llvm::DIFile *F = DBuilder.createFile(File, Dir, CSInfo, Source);
473 DIFileCache[FileName.data()].reset(F);
477 std::string CGDebugInfo::remapDIPath(StringRef Path) const {
478 for (const auto &Entry : DebugPrefixMap)
479 if (Path.startswith(Entry.first))
480 return (Twine(Entry.second) + Path.substr(Entry.first.size())).str();
484 unsigned CGDebugInfo::getLineNumber(SourceLocation Loc) {
485 if (Loc.isInvalid() && CurLoc.isInvalid())
487 SourceManager &SM = CGM.getContext().getSourceManager();
488 PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
489 return PLoc.isValid() ? PLoc.getLine() : 0;
492 unsigned CGDebugInfo::getColumnNumber(SourceLocation Loc, bool Force) {
493 // We may not want column information at all.
494 if (!Force && !CGM.getCodeGenOpts().DebugColumnInfo)
497 // If the location is invalid then use the current column.
498 if (Loc.isInvalid() && CurLoc.isInvalid())
500 SourceManager &SM = CGM.getContext().getSourceManager();
501 PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
502 return PLoc.isValid() ? PLoc.getColumn() : 0;
505 StringRef CGDebugInfo::getCurrentDirname() {
506 if (!CGM.getCodeGenOpts().DebugCompilationDir.empty())
507 return CGM.getCodeGenOpts().DebugCompilationDir;
509 if (!CWDName.empty())
511 SmallString<256> CWD;
512 llvm::sys::fs::current_path(CWD);
513 return CWDName = internString(CWD);
516 void CGDebugInfo::CreateCompileUnit() {
517 SmallString<32> Checksum;
518 Optional<llvm::DIFile::ChecksumKind> CSKind;
519 Optional<llvm::DIFile::ChecksumInfo<StringRef>> CSInfo;
521 // Should we be asking the SourceManager for the main file name, instead of
522 // accepting it as an argument? This just causes the main file name to
523 // mismatch with source locations and create extra lexical scopes or
524 // mismatched debug info (a CU with a DW_AT_file of "-", because that's what
525 // the driver passed, but functions/other things have DW_AT_file of "<stdin>"
526 // because that's what the SourceManager says)
528 // Get absolute path name.
529 SourceManager &SM = CGM.getContext().getSourceManager();
530 std::string MainFileName = CGM.getCodeGenOpts().MainFileName;
531 if (MainFileName.empty())
532 MainFileName = "<stdin>";
534 // The main file name provided via the "-main-file-name" option contains just
535 // the file name itself with no path information. This file name may have had
536 // a relative path, so we look into the actual file entry for the main
537 // file to determine the real absolute path for the file.
538 std::string MainFileDir;
539 if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
540 MainFileDir = remapDIPath(MainFile->getDir()->getName());
541 if (MainFileDir != ".") {
542 llvm::SmallString<1024> MainFileDirSS(MainFileDir);
543 llvm::sys::path::append(MainFileDirSS, MainFileName);
544 MainFileName = MainFileDirSS.str();
546 // If the main file name provided is identical to the input file name, and
547 // if the input file is a preprocessed source, use the module name for
548 // debug info. The module name comes from the name specified in the first
549 // linemarker if the input is a preprocessed source.
550 if (MainFile->getName() == MainFileName &&
551 FrontendOptions::getInputKindForExtension(
552 MainFile->getName().rsplit('.').second)
554 MainFileName = CGM.getModule().getName().str();
556 CSKind = computeChecksum(SM.getMainFileID(), Checksum);
559 llvm::dwarf::SourceLanguage LangTag;
560 const LangOptions &LO = CGM.getLangOpts();
563 LangTag = llvm::dwarf::DW_LANG_ObjC_plus_plus;
564 else if (LO.CPlusPlus14)
565 LangTag = llvm::dwarf::DW_LANG_C_plus_plus_14;
566 else if (LO.CPlusPlus11)
567 LangTag = llvm::dwarf::DW_LANG_C_plus_plus_11;
569 LangTag = llvm::dwarf::DW_LANG_C_plus_plus;
570 } else if (LO.ObjC) {
571 LangTag = llvm::dwarf::DW_LANG_ObjC;
572 } else if (LO.RenderScript) {
573 LangTag = llvm::dwarf::DW_LANG_GOOGLE_RenderScript;
575 LangTag = llvm::dwarf::DW_LANG_C99;
577 LangTag = llvm::dwarf::DW_LANG_C89;
580 std::string Producer = getClangFullVersion();
582 // Figure out which version of the ObjC runtime we have.
583 unsigned RuntimeVers = 0;
585 RuntimeVers = LO.ObjCRuntime.isNonFragile() ? 2 : 1;
587 llvm::DICompileUnit::DebugEmissionKind EmissionKind;
589 case codegenoptions::NoDebugInfo:
590 case codegenoptions::LocTrackingOnly:
591 EmissionKind = llvm::DICompileUnit::NoDebug;
593 case codegenoptions::DebugLineTablesOnly:
594 EmissionKind = llvm::DICompileUnit::LineTablesOnly;
596 case codegenoptions::DebugDirectivesOnly:
597 EmissionKind = llvm::DICompileUnit::DebugDirectivesOnly;
599 case codegenoptions::LimitedDebugInfo:
600 case codegenoptions::FullDebugInfo:
601 EmissionKind = llvm::DICompileUnit::FullDebug;
606 auto &CGOpts = CGM.getCodeGenOpts();
607 // The DIFile used by the CU is distinct from the main source
608 // file. Its directory part specifies what becomes the
609 // DW_AT_comp_dir (the compilation directory), even if the source
610 // file was specified with an absolute path.
612 CSInfo.emplace(*CSKind, Checksum);
613 llvm::DIFile *CUFile = DBuilder.createFile(
614 remapDIPath(MainFileName), remapDIPath(getCurrentDirname()), CSInfo,
615 getSource(SM, SM.getMainFileID()));
617 // Create new compile unit.
618 TheCU = DBuilder.createCompileUnit(
619 LangTag, CUFile, CGOpts.EmitVersionIdentMetadata ? Producer : "",
620 LO.Optimize || CGOpts.PrepareForLTO || CGOpts.PrepareForThinLTO,
621 CGOpts.DwarfDebugFlags, RuntimeVers, CGOpts.SplitDwarfFile, EmissionKind,
622 DwoId, CGOpts.SplitDwarfInlining, CGOpts.DebugInfoForProfiling,
623 CGM.getTarget().getTriple().isNVPTX()
624 ? llvm::DICompileUnit::DebugNameTableKind::None
625 : static_cast<llvm::DICompileUnit::DebugNameTableKind>(
626 CGOpts.DebugNameTable),
627 CGOpts.DebugRangesBaseAddress);
630 llvm::DIType *CGDebugInfo::CreateType(const BuiltinType *BT) {
631 llvm::dwarf::TypeKind Encoding;
633 switch (BT->getKind()) {
634 #define BUILTIN_TYPE(Id, SingletonId)
635 #define PLACEHOLDER_TYPE(Id, SingletonId) case BuiltinType::Id:
636 #include "clang/AST/BuiltinTypes.def"
637 case BuiltinType::Dependent:
638 llvm_unreachable("Unexpected builtin type");
639 case BuiltinType::NullPtr:
640 return DBuilder.createNullPtrType();
641 case BuiltinType::Void:
643 case BuiltinType::ObjCClass:
646 DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
647 "objc_class", TheCU, TheCU->getFile(), 0);
649 case BuiltinType::ObjCId: {
650 // typedef struct objc_class *Class;
651 // typedef struct objc_object {
660 DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
661 "objc_class", TheCU, TheCU->getFile(), 0);
663 unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
665 auto *ISATy = DBuilder.createPointerType(ClassTy, Size);
667 ObjTy = DBuilder.createStructType(TheCU, "objc_object", TheCU->getFile(), 0,
668 0, 0, llvm::DINode::FlagZero, nullptr,
669 llvm::DINodeArray());
671 DBuilder.replaceArrays(
672 ObjTy, DBuilder.getOrCreateArray(&*DBuilder.createMemberType(
673 ObjTy, "isa", TheCU->getFile(), 0, Size, 0, 0,
674 llvm::DINode::FlagZero, ISATy)));
677 case BuiltinType::ObjCSel: {
679 SelTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
680 "objc_selector", TheCU,
681 TheCU->getFile(), 0);
685 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
686 case BuiltinType::Id: \
687 return getOrCreateStructPtrType("opencl_" #ImgType "_" #Suffix "_t", \
689 #include "clang/Basic/OpenCLImageTypes.def"
690 case BuiltinType::OCLSampler:
691 return getOrCreateStructPtrType("opencl_sampler_t", OCLSamplerDITy);
692 case BuiltinType::OCLEvent:
693 return getOrCreateStructPtrType("opencl_event_t", OCLEventDITy);
694 case BuiltinType::OCLClkEvent:
695 return getOrCreateStructPtrType("opencl_clk_event_t", OCLClkEventDITy);
696 case BuiltinType::OCLQueue:
697 return getOrCreateStructPtrType("opencl_queue_t", OCLQueueDITy);
698 case BuiltinType::OCLReserveID:
699 return getOrCreateStructPtrType("opencl_reserve_id_t", OCLReserveIDDITy);
700 #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
701 case BuiltinType::Id: \
702 return getOrCreateStructPtrType("opencl_" #ExtType, Id##Ty);
703 #include "clang/Basic/OpenCLExtensionTypes.def"
704 // TODO: real support for SVE types requires more infrastructure
705 // to be added first. The types have a variable length and are
706 // represented in debug info as types whose length depends on a
707 // target-specific pseudo register.
708 #define SVE_TYPE(Name, Id, SingletonId) \
709 case BuiltinType::Id:
710 #include "clang/Basic/AArch64SVEACLETypes.def"
712 unsigned DiagID = CGM.getDiags().getCustomDiagID(
713 DiagnosticsEngine::Error,
714 "cannot yet generate debug info for SVE type '%0'");
715 auto Name = BT->getName(CGM.getContext().getPrintingPolicy());
716 CGM.getDiags().Report(DiagID) << Name;
717 // Return something safe.
718 return CreateType(cast<const BuiltinType>(CGM.getContext().IntTy));
721 case BuiltinType::UChar:
722 case BuiltinType::Char_U:
723 Encoding = llvm::dwarf::DW_ATE_unsigned_char;
725 case BuiltinType::Char_S:
726 case BuiltinType::SChar:
727 Encoding = llvm::dwarf::DW_ATE_signed_char;
729 case BuiltinType::Char8:
730 case BuiltinType::Char16:
731 case BuiltinType::Char32:
732 Encoding = llvm::dwarf::DW_ATE_UTF;
734 case BuiltinType::UShort:
735 case BuiltinType::UInt:
736 case BuiltinType::UInt128:
737 case BuiltinType::ULong:
738 case BuiltinType::WChar_U:
739 case BuiltinType::ULongLong:
740 Encoding = llvm::dwarf::DW_ATE_unsigned;
742 case BuiltinType::Short:
743 case BuiltinType::Int:
744 case BuiltinType::Int128:
745 case BuiltinType::Long:
746 case BuiltinType::WChar_S:
747 case BuiltinType::LongLong:
748 Encoding = llvm::dwarf::DW_ATE_signed;
750 case BuiltinType::Bool:
751 Encoding = llvm::dwarf::DW_ATE_boolean;
753 case BuiltinType::Half:
754 case BuiltinType::Float:
755 case BuiltinType::LongDouble:
756 case BuiltinType::Float16:
757 case BuiltinType::Float128:
758 case BuiltinType::Double:
759 // FIXME: For targets where long double and __float128 have the same size,
760 // they are currently indistinguishable in the debugger without some
761 // special treatment. However, there is currently no consensus on encoding
762 // and this should be updated once a DWARF encoding exists for distinct
763 // floating point types of the same size.
764 Encoding = llvm::dwarf::DW_ATE_float;
766 case BuiltinType::ShortAccum:
767 case BuiltinType::Accum:
768 case BuiltinType::LongAccum:
769 case BuiltinType::ShortFract:
770 case BuiltinType::Fract:
771 case BuiltinType::LongFract:
772 case BuiltinType::SatShortFract:
773 case BuiltinType::SatFract:
774 case BuiltinType::SatLongFract:
775 case BuiltinType::SatShortAccum:
776 case BuiltinType::SatAccum:
777 case BuiltinType::SatLongAccum:
778 Encoding = llvm::dwarf::DW_ATE_signed_fixed;
780 case BuiltinType::UShortAccum:
781 case BuiltinType::UAccum:
782 case BuiltinType::ULongAccum:
783 case BuiltinType::UShortFract:
784 case BuiltinType::UFract:
785 case BuiltinType::ULongFract:
786 case BuiltinType::SatUShortAccum:
787 case BuiltinType::SatUAccum:
788 case BuiltinType::SatULongAccum:
789 case BuiltinType::SatUShortFract:
790 case BuiltinType::SatUFract:
791 case BuiltinType::SatULongFract:
792 Encoding = llvm::dwarf::DW_ATE_unsigned_fixed;
796 switch (BT->getKind()) {
797 case BuiltinType::Long:
800 case BuiltinType::LongLong:
801 BTName = "long long int";
803 case BuiltinType::ULong:
804 BTName = "long unsigned int";
806 case BuiltinType::ULongLong:
807 BTName = "long long unsigned int";
810 BTName = BT->getName(CGM.getLangOpts());
813 // Bit size and offset of the type.
814 uint64_t Size = CGM.getContext().getTypeSize(BT);
815 return DBuilder.createBasicType(BTName, Size, Encoding);
818 llvm::DIType *CGDebugInfo::CreateType(const ComplexType *Ty) {
819 // Bit size and offset of the type.
820 llvm::dwarf::TypeKind Encoding = llvm::dwarf::DW_ATE_complex_float;
821 if (Ty->isComplexIntegerType())
822 Encoding = llvm::dwarf::DW_ATE_lo_user;
824 uint64_t Size = CGM.getContext().getTypeSize(Ty);
825 return DBuilder.createBasicType("complex", Size, Encoding);
828 llvm::DIType *CGDebugInfo::CreateQualifiedType(QualType Ty,
829 llvm::DIFile *Unit) {
830 QualifierCollector Qc;
831 const Type *T = Qc.strip(Ty);
833 // Ignore these qualifiers for now.
834 Qc.removeObjCGCAttr();
835 Qc.removeAddressSpace();
836 Qc.removeObjCLifetime();
838 // We will create one Derived type for one qualifier and recurse to handle any
840 llvm::dwarf::Tag Tag;
842 Tag = llvm::dwarf::DW_TAG_const_type;
844 } else if (Qc.hasVolatile()) {
845 Tag = llvm::dwarf::DW_TAG_volatile_type;
847 } else if (Qc.hasRestrict()) {
848 Tag = llvm::dwarf::DW_TAG_restrict_type;
851 assert(Qc.empty() && "Unknown type qualifier for debug info");
852 return getOrCreateType(QualType(T, 0), Unit);
855 auto *FromTy = getOrCreateType(Qc.apply(CGM.getContext(), T), Unit);
857 // No need to fill in the Name, Line, Size, Alignment, Offset in case of
858 // CVR derived types.
859 return DBuilder.createQualifiedType(Tag, FromTy);
862 llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectPointerType *Ty,
863 llvm::DIFile *Unit) {
865 // The frontend treats 'id' as a typedef to an ObjCObjectType,
866 // whereas 'id<protocol>' is treated as an ObjCPointerType. For the
867 // debug info, we want to emit 'id' in both cases.
868 if (Ty->isObjCQualifiedIdType())
869 return getOrCreateType(CGM.getContext().getObjCIdType(), Unit);
871 return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
872 Ty->getPointeeType(), Unit);
875 llvm::DIType *CGDebugInfo::CreateType(const PointerType *Ty,
876 llvm::DIFile *Unit) {
877 return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
878 Ty->getPointeeType(), Unit);
881 /// \return whether a C++ mangling exists for the type defined by TD.
882 static bool hasCXXMangling(const TagDecl *TD, llvm::DICompileUnit *TheCU) {
883 switch (TheCU->getSourceLanguage()) {
884 case llvm::dwarf::DW_LANG_C_plus_plus:
885 case llvm::dwarf::DW_LANG_C_plus_plus_11:
886 case llvm::dwarf::DW_LANG_C_plus_plus_14:
888 case llvm::dwarf::DW_LANG_ObjC_plus_plus:
889 return isa<CXXRecordDecl>(TD) || isa<EnumDecl>(TD);
895 // Determines if the debug info for this tag declaration needs a type
896 // identifier. The purpose of the unique identifier is to deduplicate type
897 // information for identical types across TUs. Because of the C++ one definition
898 // rule (ODR), it is valid to assume that the type is defined the same way in
899 // every TU and its debug info is equivalent.
901 // C does not have the ODR, and it is common for codebases to contain multiple
902 // different definitions of a struct with the same name in different TUs.
903 // Therefore, if the type doesn't have a C++ mangling, don't give it an
904 // identifer. Type information in C is smaller and simpler than C++ type
905 // information, so the increase in debug info size is negligible.
907 // If the type is not externally visible, it should be unique to the current TU,
908 // and should not need an identifier to participate in type deduplication.
909 // However, when emitting CodeView, the format internally uses these
910 // unique type name identifers for references between debug info. For example,
911 // the method of a class in an anonymous namespace uses the identifer to refer
912 // to its parent class. The Microsoft C++ ABI attempts to provide unique names
913 // for such types, so when emitting CodeView, always use identifiers for C++
914 // types. This may create problems when attempting to emit CodeView when the MS
915 // C++ ABI is not in use.
916 static bool needsTypeIdentifier(const TagDecl *TD, CodeGenModule &CGM,
917 llvm::DICompileUnit *TheCU) {
918 // We only add a type identifier for types with C++ name mangling.
919 if (!hasCXXMangling(TD, TheCU))
922 // Externally visible types with C++ mangling need a type identifier.
923 if (TD->isExternallyVisible())
926 // CodeView types with C++ mangling need a type identifier.
927 if (CGM.getCodeGenOpts().EmitCodeView)
933 // Returns a unique type identifier string if one exists, or an empty string.
934 static SmallString<256> getTypeIdentifier(const TagType *Ty, CodeGenModule &CGM,
935 llvm::DICompileUnit *TheCU) {
936 SmallString<256> Identifier;
937 const TagDecl *TD = Ty->getDecl();
939 if (!needsTypeIdentifier(TD, CGM, TheCU))
941 if (const auto *RD = dyn_cast<CXXRecordDecl>(TD))
942 if (RD->getDefinition())
943 if (RD->isDynamicClass() &&
944 CGM.getVTableLinkage(RD) == llvm::GlobalValue::ExternalLinkage)
947 // TODO: This is using the RTTI name. Is there a better way to get
948 // a unique string for a type?
949 llvm::raw_svector_ostream Out(Identifier);
950 CGM.getCXXABI().getMangleContext().mangleCXXRTTIName(QualType(Ty, 0), Out);
954 /// \return the appropriate DWARF tag for a composite type.
955 static llvm::dwarf::Tag getTagForRecord(const RecordDecl *RD) {
956 llvm::dwarf::Tag Tag;
957 if (RD->isStruct() || RD->isInterface())
958 Tag = llvm::dwarf::DW_TAG_structure_type;
959 else if (RD->isUnion())
960 Tag = llvm::dwarf::DW_TAG_union_type;
962 // FIXME: This could be a struct type giving a default visibility different
963 // than C++ class type, but needs llvm metadata changes first.
964 assert(RD->isClass());
965 Tag = llvm::dwarf::DW_TAG_class_type;
970 llvm::DICompositeType *
971 CGDebugInfo::getOrCreateRecordFwdDecl(const RecordType *Ty,
972 llvm::DIScope *Ctx) {
973 const RecordDecl *RD = Ty->getDecl();
974 if (llvm::DIType *T = getTypeOrNull(CGM.getContext().getRecordType(RD)))
975 return cast<llvm::DICompositeType>(T);
976 llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
977 unsigned Line = getLineNumber(RD->getLocation());
978 StringRef RDName = getClassName(RD);
984 SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);
985 llvm::DICompositeType *RetTy = DBuilder.createReplaceableCompositeType(
986 getTagForRecord(RD), RDName, Ctx, DefUnit, Line, 0, Size, Align,
987 llvm::DINode::FlagFwdDecl, Identifier);
988 if (CGM.getCodeGenOpts().DebugFwdTemplateParams)
989 if (auto *TSpecial = dyn_cast<ClassTemplateSpecializationDecl>(RD))
990 DBuilder.replaceArrays(RetTy, llvm::DINodeArray(),
991 CollectCXXTemplateParams(TSpecial, DefUnit));
992 ReplaceMap.emplace_back(
993 std::piecewise_construct, std::make_tuple(Ty),
994 std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
998 llvm::DIType *CGDebugInfo::CreatePointerLikeType(llvm::dwarf::Tag Tag,
1001 llvm::DIFile *Unit) {
1002 // Bit size, align and offset of the type.
1003 // Size is always the size of a pointer. We can't use getTypeSize here
1004 // because that does not return the correct value for references.
1005 unsigned AddressSpace = CGM.getContext().getTargetAddressSpace(PointeeTy);
1006 uint64_t Size = CGM.getTarget().getPointerWidth(AddressSpace);
1007 auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
1008 Optional<unsigned> DWARFAddressSpace =
1009 CGM.getTarget().getDWARFAddressSpace(AddressSpace);
1011 if (Tag == llvm::dwarf::DW_TAG_reference_type ||
1012 Tag == llvm::dwarf::DW_TAG_rvalue_reference_type)
1013 return DBuilder.createReferenceType(Tag, getOrCreateType(PointeeTy, Unit),
1014 Size, Align, DWARFAddressSpace);
1016 return DBuilder.createPointerType(getOrCreateType(PointeeTy, Unit), Size,
1017 Align, DWARFAddressSpace);
1020 llvm::DIType *CGDebugInfo::getOrCreateStructPtrType(StringRef Name,
1021 llvm::DIType *&Cache) {
1024 Cache = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type, Name,
1025 TheCU, TheCU->getFile(), 0);
1026 unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
1027 Cache = DBuilder.createPointerType(Cache, Size);
1031 uint64_t CGDebugInfo::collectDefaultElementTypesForBlockPointer(
1032 const BlockPointerType *Ty, llvm::DIFile *Unit, llvm::DIDerivedType *DescTy,
1033 unsigned LineNo, SmallVectorImpl<llvm::Metadata *> &EltTys) {
1036 // Advanced by calls to CreateMemberType in increments of FType, then
1037 // returned as the overall size of the default elements.
1038 uint64_t FieldOffset = 0;
1040 // Blocks in OpenCL have unique constraints which make the standard fields
1041 // redundant while requiring size and align fields for enqueue_kernel. See
1042 // initializeForBlockHeader in CGBlocks.cpp
1043 if (CGM.getLangOpts().OpenCL) {
1044 FType = CGM.getContext().IntTy;
1045 EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));
1046 EltTys.push_back(CreateMemberType(Unit, FType, "__align", &FieldOffset));
1048 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
1049 EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
1050 FType = CGM.getContext().IntTy;
1051 EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
1052 EltTys.push_back(CreateMemberType(Unit, FType, "__reserved", &FieldOffset));
1053 FType = CGM.getContext().getPointerType(Ty->getPointeeType());
1054 EltTys.push_back(CreateMemberType(Unit, FType, "__FuncPtr", &FieldOffset));
1055 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
1056 uint64_t FieldSize = CGM.getContext().getTypeSize(Ty);
1057 uint32_t FieldAlign = CGM.getContext().getTypeAlign(Ty);
1058 EltTys.push_back(DBuilder.createMemberType(
1059 Unit, "__descriptor", nullptr, LineNo, FieldSize, FieldAlign,
1060 FieldOffset, llvm::DINode::FlagZero, DescTy));
1061 FieldOffset += FieldSize;
1067 llvm::DIType *CGDebugInfo::CreateType(const BlockPointerType *Ty,
1068 llvm::DIFile *Unit) {
1069 SmallVector<llvm::Metadata *, 8> EltTys;
1071 uint64_t FieldOffset;
1072 llvm::DINodeArray Elements;
1075 FType = CGM.getContext().UnsignedLongTy;
1076 EltTys.push_back(CreateMemberType(Unit, FType, "reserved", &FieldOffset));
1077 EltTys.push_back(CreateMemberType(Unit, FType, "Size", &FieldOffset));
1079 Elements = DBuilder.getOrCreateArray(EltTys);
1082 llvm::DINode::DIFlags Flags = llvm::DINode::FlagAppleBlock;
1085 DBuilder.createStructType(Unit, "__block_descriptor", nullptr, 0,
1086 FieldOffset, 0, Flags, nullptr, Elements);
1088 // Bit size, align and offset of the type.
1089 uint64_t Size = CGM.getContext().getTypeSize(Ty);
1091 auto *DescTy = DBuilder.createPointerType(EltTy, Size);
1093 FieldOffset = collectDefaultElementTypesForBlockPointer(Ty, Unit, DescTy,
1096 Elements = DBuilder.getOrCreateArray(EltTys);
1098 // The __block_literal_generic structs are marked with a special
1099 // DW_AT_APPLE_BLOCK attribute and are an implementation detail only
1100 // the debugger needs to know about. To allow type uniquing, emit
1101 // them without a name or a location.
1102 EltTy = DBuilder.createStructType(Unit, "", nullptr, 0, FieldOffset, 0,
1103 Flags, nullptr, Elements);
1105 return DBuilder.createPointerType(EltTy, Size);
1108 llvm::DIType *CGDebugInfo::CreateType(const TemplateSpecializationType *Ty,
1109 llvm::DIFile *Unit) {
1110 assert(Ty->isTypeAlias());
1111 llvm::DIType *Src = getOrCreateType(Ty->getAliasedType(), Unit);
1114 cast<TypeAliasTemplateDecl>(Ty->getTemplateName().getAsTemplateDecl())
1115 ->getTemplatedDecl();
1117 if (AliasDecl->hasAttr<NoDebugAttr>())
1120 SmallString<128> NS;
1121 llvm::raw_svector_ostream OS(NS);
1122 Ty->getTemplateName().print(OS, getPrintingPolicy(), /*qualified*/ false);
1123 printTemplateArgumentList(OS, Ty->template_arguments(), getPrintingPolicy());
1125 SourceLocation Loc = AliasDecl->getLocation();
1126 return DBuilder.createTypedef(Src, OS.str(), getOrCreateFile(Loc),
1128 getDeclContextDescriptor(AliasDecl));
1131 llvm::DIType *CGDebugInfo::CreateType(const TypedefType *Ty,
1132 llvm::DIFile *Unit) {
1133 llvm::DIType *Underlying =
1134 getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit);
1136 if (Ty->getDecl()->hasAttr<NoDebugAttr>())
1139 // We don't set size information, but do specify where the typedef was
1141 SourceLocation Loc = Ty->getDecl()->getLocation();
1143 // Typedefs are derived from some other type.
1144 return DBuilder.createTypedef(Underlying, Ty->getDecl()->getName(),
1145 getOrCreateFile(Loc), getLineNumber(Loc),
1146 getDeclContextDescriptor(Ty->getDecl()));
1149 static unsigned getDwarfCC(CallingConv CC) {
1152 // Avoid emitting DW_AT_calling_convention if the C convention was used.
1156 return llvm::dwarf::DW_CC_BORLAND_stdcall;
1157 case CC_X86FastCall:
1158 return llvm::dwarf::DW_CC_BORLAND_msfastcall;
1159 case CC_X86ThisCall:
1160 return llvm::dwarf::DW_CC_BORLAND_thiscall;
1161 case CC_X86VectorCall:
1162 return llvm::dwarf::DW_CC_LLVM_vectorcall;
1164 return llvm::dwarf::DW_CC_BORLAND_pascal;
1166 return llvm::dwarf::DW_CC_LLVM_Win64;
1168 return llvm::dwarf::DW_CC_LLVM_X86_64SysV;
1170 case CC_AArch64VectorCall:
1171 return llvm::dwarf::DW_CC_LLVM_AAPCS;
1173 return llvm::dwarf::DW_CC_LLVM_AAPCS_VFP;
1174 case CC_IntelOclBicc:
1175 return llvm::dwarf::DW_CC_LLVM_IntelOclBicc;
1176 case CC_SpirFunction:
1177 return llvm::dwarf::DW_CC_LLVM_SpirFunction;
1178 case CC_OpenCLKernel:
1179 return llvm::dwarf::DW_CC_LLVM_OpenCLKernel;
1181 return llvm::dwarf::DW_CC_LLVM_Swift;
1182 case CC_PreserveMost:
1183 return llvm::dwarf::DW_CC_LLVM_PreserveMost;
1184 case CC_PreserveAll:
1185 return llvm::dwarf::DW_CC_LLVM_PreserveAll;
1187 return llvm::dwarf::DW_CC_LLVM_X86RegCall;
1192 llvm::DIType *CGDebugInfo::CreateType(const FunctionType *Ty,
1193 llvm::DIFile *Unit) {
1194 SmallVector<llvm::Metadata *, 16> EltTys;
1196 // Add the result type at least.
1197 EltTys.push_back(getOrCreateType(Ty->getReturnType(), Unit));
1199 // Set up remainder of arguments if there is a prototype.
1200 // otherwise emit it as a variadic function.
1201 if (isa<FunctionNoProtoType>(Ty))
1202 EltTys.push_back(DBuilder.createUnspecifiedParameter());
1203 else if (const auto *FPT = dyn_cast<FunctionProtoType>(Ty)) {
1204 for (const QualType &ParamType : FPT->param_types())
1205 EltTys.push_back(getOrCreateType(ParamType, Unit));
1206 if (FPT->isVariadic())
1207 EltTys.push_back(DBuilder.createUnspecifiedParameter());
1210 llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
1211 return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
1212 getDwarfCC(Ty->getCallConv()));
1215 /// Convert an AccessSpecifier into the corresponding DINode flag.
1216 /// As an optimization, return 0 if the access specifier equals the
1217 /// default for the containing type.
1218 static llvm::DINode::DIFlags getAccessFlag(AccessSpecifier Access,
1219 const RecordDecl *RD) {
1220 AccessSpecifier Default = clang::AS_none;
1221 if (RD && RD->isClass())
1222 Default = clang::AS_private;
1223 else if (RD && (RD->isStruct() || RD->isUnion()))
1224 Default = clang::AS_public;
1226 if (Access == Default)
1227 return llvm::DINode::FlagZero;
1230 case clang::AS_private:
1231 return llvm::DINode::FlagPrivate;
1232 case clang::AS_protected:
1233 return llvm::DINode::FlagProtected;
1234 case clang::AS_public:
1235 return llvm::DINode::FlagPublic;
1236 case clang::AS_none:
1237 return llvm::DINode::FlagZero;
1239 llvm_unreachable("unexpected access enumerator");
1242 llvm::DIType *CGDebugInfo::createBitFieldType(const FieldDecl *BitFieldDecl,
1243 llvm::DIScope *RecordTy,
1244 const RecordDecl *RD) {
1245 StringRef Name = BitFieldDecl->getName();
1246 QualType Ty = BitFieldDecl->getType();
1247 SourceLocation Loc = BitFieldDecl->getLocation();
1248 llvm::DIFile *VUnit = getOrCreateFile(Loc);
1249 llvm::DIType *DebugType = getOrCreateType(Ty, VUnit);
1251 // Get the location for the field.
1252 llvm::DIFile *File = getOrCreateFile(Loc);
1253 unsigned Line = getLineNumber(Loc);
1255 const CGBitFieldInfo &BitFieldInfo =
1256 CGM.getTypes().getCGRecordLayout(RD).getBitFieldInfo(BitFieldDecl);
1257 uint64_t SizeInBits = BitFieldInfo.Size;
1258 assert(SizeInBits > 0 && "found named 0-width bitfield");
1259 uint64_t StorageOffsetInBits =
1260 CGM.getContext().toBits(BitFieldInfo.StorageOffset);
1261 uint64_t Offset = BitFieldInfo.Offset;
1262 // The bit offsets for big endian machines are reversed for big
1263 // endian target, compensate for that as the DIDerivedType requires
1264 // un-reversed offsets.
1265 if (CGM.getDataLayout().isBigEndian())
1266 Offset = BitFieldInfo.StorageSize - BitFieldInfo.Size - Offset;
1267 uint64_t OffsetInBits = StorageOffsetInBits + Offset;
1268 llvm::DINode::DIFlags Flags = getAccessFlag(BitFieldDecl->getAccess(), RD);
1269 return DBuilder.createBitFieldMemberType(
1270 RecordTy, Name, File, Line, SizeInBits, OffsetInBits, StorageOffsetInBits,
1275 CGDebugInfo::createFieldType(StringRef name, QualType type, SourceLocation loc,
1276 AccessSpecifier AS, uint64_t offsetInBits,
1277 uint32_t AlignInBits, llvm::DIFile *tunit,
1278 llvm::DIScope *scope, const RecordDecl *RD) {
1279 llvm::DIType *debugType = getOrCreateType(type, tunit);
1281 // Get the location for the field.
1282 llvm::DIFile *file = getOrCreateFile(loc);
1283 unsigned line = getLineNumber(loc);
1285 uint64_t SizeInBits = 0;
1286 auto Align = AlignInBits;
1287 if (!type->isIncompleteArrayType()) {
1288 TypeInfo TI = CGM.getContext().getTypeInfo(type);
1289 SizeInBits = TI.Width;
1291 Align = getTypeAlignIfRequired(type, CGM.getContext());
1294 llvm::DINode::DIFlags flags = getAccessFlag(AS, RD);
1295 return DBuilder.createMemberType(scope, name, file, line, SizeInBits, Align,
1296 offsetInBits, flags, debugType);
1299 void CGDebugInfo::CollectRecordLambdaFields(
1300 const CXXRecordDecl *CXXDecl, SmallVectorImpl<llvm::Metadata *> &elements,
1301 llvm::DIType *RecordTy) {
1302 // For C++11 Lambdas a Field will be the same as a Capture, but the Capture
1303 // has the name and the location of the variable so we should iterate over
1304 // both concurrently.
1305 const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(CXXDecl);
1306 RecordDecl::field_iterator Field = CXXDecl->field_begin();
1307 unsigned fieldno = 0;
1308 for (CXXRecordDecl::capture_const_iterator I = CXXDecl->captures_begin(),
1309 E = CXXDecl->captures_end();
1310 I != E; ++I, ++Field, ++fieldno) {
1311 const LambdaCapture &C = *I;
1312 if (C.capturesVariable()) {
1313 SourceLocation Loc = C.getLocation();
1314 assert(!Field->isBitField() && "lambdas don't have bitfield members!");
1315 VarDecl *V = C.getCapturedVar();
1316 StringRef VName = V->getName();
1317 llvm::DIFile *VUnit = getOrCreateFile(Loc);
1318 auto Align = getDeclAlignIfRequired(V, CGM.getContext());
1319 llvm::DIType *FieldType = createFieldType(
1320 VName, Field->getType(), Loc, Field->getAccess(),
1321 layout.getFieldOffset(fieldno), Align, VUnit, RecordTy, CXXDecl);
1322 elements.push_back(FieldType);
1323 } else if (C.capturesThis()) {
1324 // TODO: Need to handle 'this' in some way by probably renaming the
1325 // this of the lambda class and having a field member of 'this' or
1326 // by using AT_object_pointer for the function and having that be
1327 // used as 'this' for semantic references.
1328 FieldDecl *f = *Field;
1329 llvm::DIFile *VUnit = getOrCreateFile(f->getLocation());
1330 QualType type = f->getType();
1331 llvm::DIType *fieldType = createFieldType(
1332 "this", type, f->getLocation(), f->getAccess(),
1333 layout.getFieldOffset(fieldno), VUnit, RecordTy, CXXDecl);
1335 elements.push_back(fieldType);
1340 llvm::DIDerivedType *
1341 CGDebugInfo::CreateRecordStaticField(const VarDecl *Var, llvm::DIType *RecordTy,
1342 const RecordDecl *RD) {
1343 // Create the descriptor for the static variable, with or without
1344 // constant initializers.
1345 Var = Var->getCanonicalDecl();
1346 llvm::DIFile *VUnit = getOrCreateFile(Var->getLocation());
1347 llvm::DIType *VTy = getOrCreateType(Var->getType(), VUnit);
1349 unsigned LineNumber = getLineNumber(Var->getLocation());
1350 StringRef VName = Var->getName();
1351 llvm::Constant *C = nullptr;
1352 if (Var->getInit()) {
1353 const APValue *Value = Var->evaluateValue();
1356 C = llvm::ConstantInt::get(CGM.getLLVMContext(), Value->getInt());
1357 if (Value->isFloat())
1358 C = llvm::ConstantFP::get(CGM.getLLVMContext(), Value->getFloat());
1362 llvm::DINode::DIFlags Flags = getAccessFlag(Var->getAccess(), RD);
1363 auto Align = getDeclAlignIfRequired(Var, CGM.getContext());
1364 llvm::DIDerivedType *GV = DBuilder.createStaticMemberType(
1365 RecordTy, VName, VUnit, LineNumber, VTy, Flags, C, Align);
1366 StaticDataMemberCache[Var->getCanonicalDecl()].reset(GV);
1370 void CGDebugInfo::CollectRecordNormalField(
1371 const FieldDecl *field, uint64_t OffsetInBits, llvm::DIFile *tunit,
1372 SmallVectorImpl<llvm::Metadata *> &elements, llvm::DIType *RecordTy,
1373 const RecordDecl *RD) {
1374 StringRef name = field->getName();
1375 QualType type = field->getType();
1377 // Ignore unnamed fields unless they're anonymous structs/unions.
1378 if (name.empty() && !type->isRecordType())
1381 llvm::DIType *FieldType;
1382 if (field->isBitField()) {
1383 FieldType = createBitFieldType(field, RecordTy, RD);
1385 auto Align = getDeclAlignIfRequired(field, CGM.getContext());
1387 createFieldType(name, type, field->getLocation(), field->getAccess(),
1388 OffsetInBits, Align, tunit, RecordTy, RD);
1391 elements.push_back(FieldType);
1394 void CGDebugInfo::CollectRecordNestedType(
1395 const TypeDecl *TD, SmallVectorImpl<llvm::Metadata *> &elements) {
1396 QualType Ty = CGM.getContext().getTypeDeclType(TD);
1397 // Injected class names are not considered nested records.
1398 if (isa<InjectedClassNameType>(Ty))
1400 SourceLocation Loc = TD->getLocation();
1401 llvm::DIType *nestedType = getOrCreateType(Ty, getOrCreateFile(Loc));
1402 elements.push_back(nestedType);
1405 void CGDebugInfo::CollectRecordFields(
1406 const RecordDecl *record, llvm::DIFile *tunit,
1407 SmallVectorImpl<llvm::Metadata *> &elements,
1408 llvm::DICompositeType *RecordTy) {
1409 const auto *CXXDecl = dyn_cast<CXXRecordDecl>(record);
1411 if (CXXDecl && CXXDecl->isLambda())
1412 CollectRecordLambdaFields(CXXDecl, elements, RecordTy);
1414 const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(record);
1416 // Field number for non-static fields.
1417 unsigned fieldNo = 0;
1419 // Static and non-static members should appear in the same order as
1420 // the corresponding declarations in the source program.
1421 for (const auto *I : record->decls())
1422 if (const auto *V = dyn_cast<VarDecl>(I)) {
1423 if (V->hasAttr<NoDebugAttr>())
1426 // Skip variable template specializations when emitting CodeView. MSVC
1427 // doesn't emit them.
1428 if (CGM.getCodeGenOpts().EmitCodeView &&
1429 isa<VarTemplateSpecializationDecl>(V))
1432 if (isa<VarTemplatePartialSpecializationDecl>(V))
1435 // Reuse the existing static member declaration if one exists
1436 auto MI = StaticDataMemberCache.find(V->getCanonicalDecl());
1437 if (MI != StaticDataMemberCache.end()) {
1438 assert(MI->second &&
1439 "Static data member declaration should still exist");
1440 elements.push_back(MI->second);
1442 auto Field = CreateRecordStaticField(V, RecordTy, record);
1443 elements.push_back(Field);
1445 } else if (const auto *field = dyn_cast<FieldDecl>(I)) {
1446 CollectRecordNormalField(field, layout.getFieldOffset(fieldNo), tunit,
1447 elements, RecordTy, record);
1449 // Bump field number for next field.
1451 } else if (CGM.getCodeGenOpts().EmitCodeView) {
1452 // Debug info for nested types is included in the member list only for
1454 if (const auto *nestedType = dyn_cast<TypeDecl>(I))
1455 if (!nestedType->isImplicit() &&
1456 nestedType->getDeclContext() == record)
1457 CollectRecordNestedType(nestedType, elements);
1462 llvm::DISubroutineType *
1463 CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
1464 llvm::DIFile *Unit) {
1465 const FunctionProtoType *Func = Method->getType()->getAs<FunctionProtoType>();
1466 if (Method->isStatic())
1467 return cast_or_null<llvm::DISubroutineType>(
1468 getOrCreateType(QualType(Func, 0), Unit));
1469 return getOrCreateInstanceMethodType(Method->getThisType(), Func, Unit);
1472 llvm::DISubroutineType *CGDebugInfo::getOrCreateInstanceMethodType(
1473 QualType ThisPtr, const FunctionProtoType *Func, llvm::DIFile *Unit) {
1474 // Add "this" pointer.
1475 llvm::DITypeRefArray Args(
1476 cast<llvm::DISubroutineType>(getOrCreateType(QualType(Func, 0), Unit))
1478 assert(Args.size() && "Invalid number of arguments!");
1480 SmallVector<llvm::Metadata *, 16> Elts;
1482 // First element is always return type. For 'void' functions it is NULL.
1483 Elts.push_back(Args[0]);
1485 // "this" pointer is always first argument.
1486 const CXXRecordDecl *RD = ThisPtr->getPointeeCXXRecordDecl();
1487 if (isa<ClassTemplateSpecializationDecl>(RD)) {
1488 // Create pointer type directly in this case.
1489 const PointerType *ThisPtrTy = cast<PointerType>(ThisPtr);
1490 QualType PointeeTy = ThisPtrTy->getPointeeType();
1491 unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
1492 uint64_t Size = CGM.getTarget().getPointerWidth(AS);
1493 auto Align = getTypeAlignIfRequired(ThisPtrTy, CGM.getContext());
1494 llvm::DIType *PointeeType = getOrCreateType(PointeeTy, Unit);
1495 llvm::DIType *ThisPtrType =
1496 DBuilder.createPointerType(PointeeType, Size, Align);
1497 TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
1498 // TODO: This and the artificial type below are misleading, the
1499 // types aren't artificial the argument is, but the current
1500 // metadata doesn't represent that.
1501 ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1502 Elts.push_back(ThisPtrType);
1504 llvm::DIType *ThisPtrType = getOrCreateType(ThisPtr, Unit);
1505 TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
1506 ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
1507 Elts.push_back(ThisPtrType);
1510 // Copy rest of the arguments.
1511 for (unsigned i = 1, e = Args.size(); i != e; ++i)
1512 Elts.push_back(Args[i]);
1514 llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
1516 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
1517 if (Func->getExtProtoInfo().RefQualifier == RQ_LValue)
1518 Flags |= llvm::DINode::FlagLValueReference;
1519 if (Func->getExtProtoInfo().RefQualifier == RQ_RValue)
1520 Flags |= llvm::DINode::FlagRValueReference;
1522 return DBuilder.createSubroutineType(EltTypeArray, Flags,
1523 getDwarfCC(Func->getCallConv()));
1526 /// isFunctionLocalClass - Return true if CXXRecordDecl is defined
1527 /// inside a function.
1528 static bool isFunctionLocalClass(const CXXRecordDecl *RD) {
1529 if (const auto *NRD = dyn_cast<CXXRecordDecl>(RD->getDeclContext()))
1530 return isFunctionLocalClass(NRD);
1531 if (isa<FunctionDecl>(RD->getDeclContext()))
1536 llvm::DISubprogram *CGDebugInfo::CreateCXXMemberFunction(
1537 const CXXMethodDecl *Method, llvm::DIFile *Unit, llvm::DIType *RecordTy) {
1539 isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method);
1541 StringRef MethodName = getFunctionName(Method);
1542 llvm::DISubroutineType *MethodTy = getOrCreateMethodType(Method, Unit);
1544 // Since a single ctor/dtor corresponds to multiple functions, it doesn't
1545 // make sense to give a single ctor/dtor a linkage name.
1546 StringRef MethodLinkageName;
1547 // FIXME: 'isFunctionLocalClass' seems like an arbitrary/unintentional
1548 // property to use here. It may've been intended to model "is non-external
1549 // type" but misses cases of non-function-local but non-external classes such
1550 // as those in anonymous namespaces as well as the reverse - external types
1551 // that are function local, such as those in (non-local) inline functions.
1552 if (!IsCtorOrDtor && !isFunctionLocalClass(Method->getParent()))
1553 MethodLinkageName = CGM.getMangledName(Method);
1555 // Get the location for the method.
1556 llvm::DIFile *MethodDefUnit = nullptr;
1557 unsigned MethodLine = 0;
1558 if (!Method->isImplicit()) {
1559 MethodDefUnit = getOrCreateFile(Method->getLocation());
1560 MethodLine = getLineNumber(Method->getLocation());
1563 // Collect virtual method info.
1564 llvm::DIType *ContainingType = nullptr;
1565 unsigned VIndex = 0;
1566 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
1567 llvm::DISubprogram::DISPFlags SPFlags = llvm::DISubprogram::SPFlagZero;
1568 int ThisAdjustment = 0;
1570 if (Method->isVirtual()) {
1571 if (Method->isPure())
1572 SPFlags |= llvm::DISubprogram::SPFlagPureVirtual;
1574 SPFlags |= llvm::DISubprogram::SPFlagVirtual;
1576 if (CGM.getTarget().getCXXABI().isItaniumFamily()) {
1577 // It doesn't make sense to give a virtual destructor a vtable index,
1578 // since a single destructor has two entries in the vtable.
1579 if (!isa<CXXDestructorDecl>(Method))
1580 VIndex = CGM.getItaniumVTableContext().getMethodVTableIndex(Method);
1582 // Emit MS ABI vftable information. There is only one entry for the
1584 const auto *DD = dyn_cast<CXXDestructorDecl>(Method);
1585 GlobalDecl GD = DD ? GlobalDecl(DD, Dtor_Deleting) : GlobalDecl(Method);
1586 MethodVFTableLocation ML =
1587 CGM.getMicrosoftVTableContext().getMethodVFTableLocation(GD);
1590 // CodeView only records the vftable offset in the class that introduces
1591 // the virtual method. This is possible because, unlike Itanium, the MS
1592 // C++ ABI does not include all virtual methods from non-primary bases in
1593 // the vtable for the most derived class. For example, if C inherits from
1594 // A and B, C's primary vftable will not include B's virtual methods.
1595 if (Method->size_overridden_methods() == 0)
1596 Flags |= llvm::DINode::FlagIntroducedVirtual;
1598 // The 'this' adjustment accounts for both the virtual and non-virtual
1599 // portions of the adjustment. Presumably the debugger only uses it when
1600 // it knows the dynamic type of an object.
1601 ThisAdjustment = CGM.getCXXABI()
1602 .getVirtualFunctionPrologueThisAdjustment(GD)
1605 ContainingType = RecordTy;
1608 if (Method->isStatic())
1609 Flags |= llvm::DINode::FlagStaticMember;
1610 if (Method->isImplicit())
1611 Flags |= llvm::DINode::FlagArtificial;
1612 Flags |= getAccessFlag(Method->getAccess(), Method->getParent());
1613 if (const auto *CXXC = dyn_cast<CXXConstructorDecl>(Method)) {
1614 if (CXXC->isExplicit())
1615 Flags |= llvm::DINode::FlagExplicit;
1616 } else if (const auto *CXXC = dyn_cast<CXXConversionDecl>(Method)) {
1617 if (CXXC->isExplicit())
1618 Flags |= llvm::DINode::FlagExplicit;
1620 if (Method->hasPrototype())
1621 Flags |= llvm::DINode::FlagPrototyped;
1622 if (Method->getRefQualifier() == RQ_LValue)
1623 Flags |= llvm::DINode::FlagLValueReference;
1624 if (Method->getRefQualifier() == RQ_RValue)
1625 Flags |= llvm::DINode::FlagRValueReference;
1626 if (CGM.getLangOpts().Optimize)
1627 SPFlags |= llvm::DISubprogram::SPFlagOptimized;
1629 llvm::DINodeArray TParamsArray = CollectFunctionTemplateParams(Method, Unit);
1630 llvm::DISubprogram *SP = DBuilder.createMethod(
1631 RecordTy, MethodName, MethodLinkageName, MethodDefUnit, MethodLine,
1632 MethodTy, VIndex, ThisAdjustment, ContainingType, Flags, SPFlags,
1633 TParamsArray.get());
1635 SPCache[Method->getCanonicalDecl()].reset(SP);
1640 void CGDebugInfo::CollectCXXMemberFunctions(
1641 const CXXRecordDecl *RD, llvm::DIFile *Unit,
1642 SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy) {
1644 // Since we want more than just the individual member decls if we
1645 // have templated functions iterate over every declaration to gather
1647 for (const auto *I : RD->decls()) {
1648 const auto *Method = dyn_cast<CXXMethodDecl>(I);
1649 // If the member is implicit, don't add it to the member list. This avoids
1650 // the member being added to type units by LLVM, while still allowing it
1651 // to be emitted into the type declaration/reference inside the compile
1653 // Ditto 'nodebug' methods, for consistency with CodeGenFunction.cpp.
1654 // FIXME: Handle Using(Shadow?)Decls here to create
1655 // DW_TAG_imported_declarations inside the class for base decls brought into
1656 // derived classes. GDB doesn't seem to notice/leverage these when I tried
1657 // it, so I'm not rushing to fix this. (GCC seems to produce them, if
1659 if (!Method || Method->isImplicit() || Method->hasAttr<NoDebugAttr>())
1662 if (Method->getType()->castAs<FunctionProtoType>()->getContainedAutoType())
1665 // Reuse the existing member function declaration if it exists.
1666 // It may be associated with the declaration of the type & should be
1667 // reused as we're building the definition.
1669 // This situation can arise in the vtable-based debug info reduction where
1670 // implicit members are emitted in a non-vtable TU.
1671 auto MI = SPCache.find(Method->getCanonicalDecl());
1672 EltTys.push_back(MI == SPCache.end()
1673 ? CreateCXXMemberFunction(Method, Unit, RecordTy)
1674 : static_cast<llvm::Metadata *>(MI->second));
1678 void CGDebugInfo::CollectCXXBases(const CXXRecordDecl *RD, llvm::DIFile *Unit,
1679 SmallVectorImpl<llvm::Metadata *> &EltTys,
1680 llvm::DIType *RecordTy) {
1681 llvm::DenseSet<CanonicalDeclPtr<const CXXRecordDecl>> SeenTypes;
1682 CollectCXXBasesAux(RD, Unit, EltTys, RecordTy, RD->bases(), SeenTypes,
1683 llvm::DINode::FlagZero);
1685 // If we are generating CodeView debug info, we also need to emit records for
1686 // indirect virtual base classes.
1687 if (CGM.getCodeGenOpts().EmitCodeView) {
1688 CollectCXXBasesAux(RD, Unit, EltTys, RecordTy, RD->vbases(), SeenTypes,
1689 llvm::DINode::FlagIndirectVirtualBase);
1693 void CGDebugInfo::CollectCXXBasesAux(
1694 const CXXRecordDecl *RD, llvm::DIFile *Unit,
1695 SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy,
1696 const CXXRecordDecl::base_class_const_range &Bases,
1697 llvm::DenseSet<CanonicalDeclPtr<const CXXRecordDecl>> &SeenTypes,
1698 llvm::DINode::DIFlags StartingFlags) {
1699 const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1700 for (const auto &BI : Bases) {
1702 cast<CXXRecordDecl>(BI.getType()->castAs<RecordType>()->getDecl());
1703 if (!SeenTypes.insert(Base).second)
1705 auto *BaseTy = getOrCreateType(BI.getType(), Unit);
1706 llvm::DINode::DIFlags BFlags = StartingFlags;
1707 uint64_t BaseOffset;
1708 uint32_t VBPtrOffset = 0;
1710 if (BI.isVirtual()) {
1711 if (CGM.getTarget().getCXXABI().isItaniumFamily()) {
1712 // virtual base offset offset is -ve. The code generator emits dwarf
1713 // expression where it expects +ve number.
1714 BaseOffset = 0 - CGM.getItaniumVTableContext()
1715 .getVirtualBaseOffsetOffset(RD, Base)
1718 // In the MS ABI, store the vbtable offset, which is analogous to the
1719 // vbase offset offset in Itanium.
1721 4 * CGM.getMicrosoftVTableContext().getVBTableIndex(RD, Base);
1722 VBPtrOffset = CGM.getContext()
1723 .getASTRecordLayout(RD)
1727 BFlags |= llvm::DINode::FlagVirtual;
1729 BaseOffset = CGM.getContext().toBits(RL.getBaseClassOffset(Base));
1730 // FIXME: Inconsistent units for BaseOffset. It is in bytes when
1731 // BI->isVirtual() and bits when not.
1733 BFlags |= getAccessFlag(BI.getAccessSpecifier(), RD);
1734 llvm::DIType *DTy = DBuilder.createInheritance(RecordTy, BaseTy, BaseOffset,
1735 VBPtrOffset, BFlags);
1736 EltTys.push_back(DTy);
1741 CGDebugInfo::CollectTemplateParams(const TemplateParameterList *TPList,
1742 ArrayRef<TemplateArgument> TAList,
1743 llvm::DIFile *Unit) {
1744 SmallVector<llvm::Metadata *, 16> TemplateParams;
1745 for (unsigned i = 0, e = TAList.size(); i != e; ++i) {
1746 const TemplateArgument &TA = TAList[i];
1749 Name = TPList->getParam(i)->getName();
1750 switch (TA.getKind()) {
1751 case TemplateArgument::Type: {
1752 llvm::DIType *TTy = getOrCreateType(TA.getAsType(), Unit);
1753 TemplateParams.push_back(
1754 DBuilder.createTemplateTypeParameter(TheCU, Name, TTy));
1756 case TemplateArgument::Integral: {
1757 llvm::DIType *TTy = getOrCreateType(TA.getIntegralType(), Unit);
1758 TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1760 llvm::ConstantInt::get(CGM.getLLVMContext(), TA.getAsIntegral())));
1762 case TemplateArgument::Declaration: {
1763 const ValueDecl *D = TA.getAsDecl();
1764 QualType T = TA.getParamTypeForDecl().getDesugaredType(CGM.getContext());
1765 llvm::DIType *TTy = getOrCreateType(T, Unit);
1766 llvm::Constant *V = nullptr;
1767 // Skip retrieve the value if that template parameter has cuda device
1768 // attribute, i.e. that value is not available at the host side.
1769 if (!CGM.getLangOpts().CUDA || CGM.getLangOpts().CUDAIsDevice ||
1770 !D->hasAttr<CUDADeviceAttr>()) {
1771 const CXXMethodDecl *MD;
1772 // Variable pointer template parameters have a value that is the address
1774 if (const auto *VD = dyn_cast<VarDecl>(D))
1775 V = CGM.GetAddrOfGlobalVar(VD);
1776 // Member function pointers have special support for building them,
1777 // though this is currently unsupported in LLVM CodeGen.
1778 else if ((MD = dyn_cast<CXXMethodDecl>(D)) && MD->isInstance())
1779 V = CGM.getCXXABI().EmitMemberFunctionPointer(MD);
1780 else if (const auto *FD = dyn_cast<FunctionDecl>(D))
1781 V = CGM.GetAddrOfFunction(FD);
1782 // Member data pointers have special handling too to compute the fixed
1783 // offset within the object.
1784 else if (const auto *MPT =
1785 dyn_cast<MemberPointerType>(T.getTypePtr())) {
1786 // These five lines (& possibly the above member function pointer
1787 // handling) might be able to be refactored to use similar code in
1788 // CodeGenModule::getMemberPointerConstant
1789 uint64_t fieldOffset = CGM.getContext().getFieldOffset(D);
1791 CGM.getContext().toCharUnitsFromBits((int64_t)fieldOffset);
1792 V = CGM.getCXXABI().EmitMemberDataPointer(MPT, chars);
1794 assert(V && "Failed to find template parameter pointer");
1795 V = V->stripPointerCasts();
1797 TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1798 TheCU, Name, TTy, cast_or_null<llvm::Constant>(V)));
1800 case TemplateArgument::NullPtr: {
1801 QualType T = TA.getNullPtrType();
1802 llvm::DIType *TTy = getOrCreateType(T, Unit);
1803 llvm::Constant *V = nullptr;
1804 // Special case member data pointer null values since they're actually -1
1806 if (const auto *MPT = dyn_cast<MemberPointerType>(T.getTypePtr()))
1807 // But treat member function pointers as simple zero integers because
1808 // it's easier than having a special case in LLVM's CodeGen. If LLVM
1809 // CodeGen grows handling for values of non-null member function
1810 // pointers then perhaps we could remove this special case and rely on
1811 // EmitNullMemberPointer for member function pointers.
1812 if (MPT->isMemberDataPointer())
1813 V = CGM.getCXXABI().EmitNullMemberPointer(MPT);
1815 V = llvm::ConstantInt::get(CGM.Int8Ty, 0);
1816 TemplateParams.push_back(
1817 DBuilder.createTemplateValueParameter(TheCU, Name, TTy, V));
1819 case TemplateArgument::Template:
1820 TemplateParams.push_back(DBuilder.createTemplateTemplateParameter(
1821 TheCU, Name, nullptr,
1822 TA.getAsTemplate().getAsTemplateDecl()->getQualifiedNameAsString()));
1824 case TemplateArgument::Pack:
1825 TemplateParams.push_back(DBuilder.createTemplateParameterPack(
1826 TheCU, Name, nullptr,
1827 CollectTemplateParams(nullptr, TA.getPackAsArray(), Unit)));
1829 case TemplateArgument::Expression: {
1830 const Expr *E = TA.getAsExpr();
1831 QualType T = E->getType();
1833 T = CGM.getContext().getLValueReferenceType(T);
1834 llvm::Constant *V = ConstantEmitter(CGM).emitAbstract(E, T);
1835 assert(V && "Expression in template argument isn't constant");
1836 llvm::DIType *TTy = getOrCreateType(T, Unit);
1837 TemplateParams.push_back(DBuilder.createTemplateValueParameter(
1838 TheCU, Name, TTy, V->stripPointerCasts()));
1840 // And the following should never occur:
1841 case TemplateArgument::TemplateExpansion:
1842 case TemplateArgument::Null:
1844 "These argument types shouldn't exist in concrete types");
1847 return DBuilder.getOrCreateArray(TemplateParams);
1851 CGDebugInfo::CollectFunctionTemplateParams(const FunctionDecl *FD,
1852 llvm::DIFile *Unit) {
1853 if (FD->getTemplatedKind() ==
1854 FunctionDecl::TK_FunctionTemplateSpecialization) {
1855 const TemplateParameterList *TList = FD->getTemplateSpecializationInfo()
1857 ->getTemplateParameters();
1858 return CollectTemplateParams(
1859 TList, FD->getTemplateSpecializationArgs()->asArray(), Unit);
1861 return llvm::DINodeArray();
1864 llvm::DINodeArray CGDebugInfo::CollectVarTemplateParams(const VarDecl *VL,
1865 llvm::DIFile *Unit) {
1866 // Always get the full list of parameters, not just the ones from the
1867 // specialization. A partial specialization may have fewer parameters than
1868 // there are arguments.
1869 auto *TS = dyn_cast<VarTemplateSpecializationDecl>(VL);
1871 return llvm::DINodeArray();
1872 VarTemplateDecl *T = TS->getSpecializedTemplate();
1873 const TemplateParameterList *TList = T->getTemplateParameters();
1874 auto TA = TS->getTemplateArgs().asArray();
1875 return CollectTemplateParams(TList, TA, Unit);
1878 llvm::DINodeArray CGDebugInfo::CollectCXXTemplateParams(
1879 const ClassTemplateSpecializationDecl *TSpecial, llvm::DIFile *Unit) {
1880 // Always get the full list of parameters, not just the ones from the
1881 // specialization. A partial specialization may have fewer parameters than
1882 // there are arguments.
1883 TemplateParameterList *TPList =
1884 TSpecial->getSpecializedTemplate()->getTemplateParameters();
1885 const TemplateArgumentList &TAList = TSpecial->getTemplateArgs();
1886 return CollectTemplateParams(TPList, TAList.asArray(), Unit);
1889 llvm::DIType *CGDebugInfo::getOrCreateVTablePtrType(llvm::DIFile *Unit) {
1891 return VTablePtrType;
1893 ASTContext &Context = CGM.getContext();
1896 llvm::Metadata *STy = getOrCreateType(Context.IntTy, Unit);
1897 llvm::DITypeRefArray SElements = DBuilder.getOrCreateTypeArray(STy);
1898 llvm::DIType *SubTy = DBuilder.createSubroutineType(SElements);
1899 unsigned Size = Context.getTypeSize(Context.VoidPtrTy);
1900 unsigned VtblPtrAddressSpace = CGM.getTarget().getVtblPtrAddressSpace();
1901 Optional<unsigned> DWARFAddressSpace =
1902 CGM.getTarget().getDWARFAddressSpace(VtblPtrAddressSpace);
1904 llvm::DIType *vtbl_ptr_type = DBuilder.createPointerType(
1905 SubTy, Size, 0, DWARFAddressSpace, "__vtbl_ptr_type");
1906 VTablePtrType = DBuilder.createPointerType(vtbl_ptr_type, Size);
1907 return VTablePtrType;
1910 StringRef CGDebugInfo::getVTableName(const CXXRecordDecl *RD) {
1911 // Copy the gdb compatible name on the side and use its reference.
1912 return internString("_vptr$", RD->getNameAsString());
1915 StringRef CGDebugInfo::getDynamicInitializerName(const VarDecl *VD,
1916 DynamicInitKind StubKind,
1917 llvm::Function *InitFn) {
1918 // If we're not emitting codeview, use the mangled name. For Itanium, this is
1920 if (!CGM.getCodeGenOpts().EmitCodeView)
1921 return InitFn->getName();
1923 // Print the normal qualified name for the variable, then break off the last
1924 // NNS, and add the appropriate other text. Clang always prints the global
1925 // variable name without template arguments, so we can use rsplit("::") and
1926 // then recombine the pieces.
1927 SmallString<128> QualifiedGV;
1931 llvm::raw_svector_ostream OS(QualifiedGV);
1932 VD->printQualifiedName(OS, getPrintingPolicy());
1933 std::tie(Quals, GVName) = OS.str().rsplit("::");
1935 std::swap(Quals, GVName);
1938 SmallString<128> InitName;
1939 llvm::raw_svector_ostream OS(InitName);
1941 OS << Quals << "::";
1944 case DynamicInitKind::NoStub:
1945 llvm_unreachable("not an initializer");
1946 case DynamicInitKind::Initializer:
1947 OS << "`dynamic initializer for '";
1949 case DynamicInitKind::AtExit:
1950 OS << "`dynamic atexit destructor for '";
1956 // Add any template specialization args.
1957 if (const auto *VTpl = dyn_cast<VarTemplateSpecializationDecl>(VD)) {
1958 printTemplateArgumentList(OS, VTpl->getTemplateArgs().asArray(),
1959 getPrintingPolicy());
1964 return internString(OS.str());
1967 void CGDebugInfo::CollectVTableInfo(const CXXRecordDecl *RD, llvm::DIFile *Unit,
1968 SmallVectorImpl<llvm::Metadata *> &EltTys,
1969 llvm::DICompositeType *RecordTy) {
1970 // If this class is not dynamic then there is not any vtable info to collect.
1971 if (!RD->isDynamicClass())
1974 // Don't emit any vtable shape or vptr info if this class doesn't have an
1975 // extendable vfptr. This can happen if the class doesn't have virtual
1976 // methods, or in the MS ABI if those virtual methods only come from virtually
1978 const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
1979 if (!RL.hasExtendableVFPtr())
1982 // CodeView needs to know how large the vtable of every dynamic class is, so
1983 // emit a special named pointer type into the element list. The vptr type
1984 // points to this type as well.
1985 llvm::DIType *VPtrTy = nullptr;
1986 bool NeedVTableShape = CGM.getCodeGenOpts().EmitCodeView &&
1987 CGM.getTarget().getCXXABI().isMicrosoft();
1988 if (NeedVTableShape) {
1990 CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
1991 const VTableLayout &VFTLayout =
1992 CGM.getMicrosoftVTableContext().getVFTableLayout(RD, CharUnits::Zero());
1993 unsigned VSlotCount =
1994 VFTLayout.vtable_components().size() - CGM.getLangOpts().RTTIData;
1995 unsigned VTableWidth = PtrWidth * VSlotCount;
1996 unsigned VtblPtrAddressSpace = CGM.getTarget().getVtblPtrAddressSpace();
1997 Optional<unsigned> DWARFAddressSpace =
1998 CGM.getTarget().getDWARFAddressSpace(VtblPtrAddressSpace);
2000 // Create a very wide void* type and insert it directly in the element list.
2001 llvm::DIType *VTableType = DBuilder.createPointerType(
2002 nullptr, VTableWidth, 0, DWARFAddressSpace, "__vtbl_ptr_type");
2003 EltTys.push_back(VTableType);
2005 // The vptr is a pointer to this special vtable type.
2006 VPtrTy = DBuilder.createPointerType(VTableType, PtrWidth);
2009 // If there is a primary base then the artificial vptr member lives there.
2010 if (RL.getPrimaryBase())
2014 VPtrTy = getOrCreateVTablePtrType(Unit);
2016 unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
2017 llvm::DIType *VPtrMember =
2018 DBuilder.createMemberType(Unit, getVTableName(RD), Unit, 0, Size, 0, 0,
2019 llvm::DINode::FlagArtificial, VPtrTy);
2020 EltTys.push_back(VPtrMember);
2023 llvm::DIType *CGDebugInfo::getOrCreateRecordType(QualType RTy,
2024 SourceLocation Loc) {
2025 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
2026 llvm::DIType *T = getOrCreateType(RTy, getOrCreateFile(Loc));
2030 llvm::DIType *CGDebugInfo::getOrCreateInterfaceType(QualType D,
2031 SourceLocation Loc) {
2032 return getOrCreateStandaloneType(D, Loc);
2035 llvm::DIType *CGDebugInfo::getOrCreateStandaloneType(QualType D,
2036 SourceLocation Loc) {
2037 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
2038 assert(!D.isNull() && "null type");
2039 llvm::DIType *T = getOrCreateType(D, getOrCreateFile(Loc));
2040 assert(T && "could not create debug info for type");
2042 RetainedTypes.push_back(D.getAsOpaquePtr());
2046 void CGDebugInfo::addHeapAllocSiteMetadata(llvm::Instruction *CI,
2048 SourceLocation Loc) {
2050 if (D.getTypePtr()->isVoidPointerType()) {
2051 node = llvm::MDNode::get(CGM.getLLVMContext(), None);
2053 QualType PointeeTy = D.getTypePtr()->getPointeeType();
2054 node = getOrCreateType(PointeeTy, getOrCreateFile(Loc));
2057 CI->setMetadata("heapallocsite", node);
2060 void CGDebugInfo::completeType(const EnumDecl *ED) {
2061 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
2063 QualType Ty = CGM.getContext().getEnumType(ED);
2064 void *TyPtr = Ty.getAsOpaquePtr();
2065 auto I = TypeCache.find(TyPtr);
2066 if (I == TypeCache.end() || !cast<llvm::DIType>(I->second)->isForwardDecl())
2068 llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<EnumType>());
2069 assert(!Res->isForwardDecl());
2070 TypeCache[TyPtr].reset(Res);
2073 void CGDebugInfo::completeType(const RecordDecl *RD) {
2074 if (DebugKind > codegenoptions::LimitedDebugInfo ||
2075 !CGM.getLangOpts().CPlusPlus)
2076 completeRequiredType(RD);
2079 /// Return true if the class or any of its methods are marked dllimport.
2080 static bool isClassOrMethodDLLImport(const CXXRecordDecl *RD) {
2081 if (RD->hasAttr<DLLImportAttr>())
2083 for (const CXXMethodDecl *MD : RD->methods())
2084 if (MD->hasAttr<DLLImportAttr>())
2089 /// Does a type definition exist in an imported clang module?
2090 static bool isDefinedInClangModule(const RecordDecl *RD) {
2091 // Only definitions that where imported from an AST file come from a module.
2092 if (!RD || !RD->isFromASTFile())
2094 // Anonymous entities cannot be addressed. Treat them as not from module.
2095 if (!RD->isExternallyVisible() && RD->getName().empty())
2097 if (auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD)) {
2098 if (!CXXDecl->isCompleteDefinition())
2100 // Check wether RD is a template.
2101 auto TemplateKind = CXXDecl->getTemplateSpecializationKind();
2102 if (TemplateKind != TSK_Undeclared) {
2103 // Unfortunately getOwningModule() isn't accurate enough to find the
2104 // owning module of a ClassTemplateSpecializationDecl that is inside a
2105 // namespace spanning multiple modules.
2106 bool Explicit = false;
2107 if (auto *TD = dyn_cast<ClassTemplateSpecializationDecl>(CXXDecl))
2108 Explicit = TD->isExplicitInstantiationOrSpecialization();
2109 if (!Explicit && CXXDecl->getEnclosingNamespaceContext())
2111 // This is a template, check the origin of the first member.
2112 if (CXXDecl->field_begin() == CXXDecl->field_end())
2113 return TemplateKind == TSK_ExplicitInstantiationDeclaration;
2114 if (!CXXDecl->field_begin()->isFromASTFile())
2121 void CGDebugInfo::completeClassData(const RecordDecl *RD) {
2122 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD))
2123 if (CXXRD->isDynamicClass() &&
2124 CGM.getVTableLinkage(CXXRD) ==
2125 llvm::GlobalValue::AvailableExternallyLinkage &&
2126 !isClassOrMethodDLLImport(CXXRD))
2129 if (DebugTypeExtRefs && isDefinedInClangModule(RD->getDefinition()))
2135 void CGDebugInfo::completeClass(const RecordDecl *RD) {
2136 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
2138 QualType Ty = CGM.getContext().getRecordType(RD);
2139 void *TyPtr = Ty.getAsOpaquePtr();
2140 auto I = TypeCache.find(TyPtr);
2141 if (I != TypeCache.end() && !cast<llvm::DIType>(I->second)->isForwardDecl())
2143 llvm::DIType *Res = CreateTypeDefinition(Ty->castAs<RecordType>());
2144 assert(!Res->isForwardDecl());
2145 TypeCache[TyPtr].reset(Res);
2148 static bool hasExplicitMemberDefinition(CXXRecordDecl::method_iterator I,
2149 CXXRecordDecl::method_iterator End) {
2150 for (CXXMethodDecl *MD : llvm::make_range(I, End))
2151 if (FunctionDecl *Tmpl = MD->getInstantiatedFromMemberFunction())
2152 if (!Tmpl->isImplicit() && Tmpl->isThisDeclarationADefinition() &&
2153 !MD->getMemberSpecializationInfo()->isExplicitSpecialization())
2158 static bool shouldOmitDefinition(codegenoptions::DebugInfoKind DebugKind,
2159 bool DebugTypeExtRefs, const RecordDecl *RD,
2160 const LangOptions &LangOpts) {
2161 if (DebugTypeExtRefs && isDefinedInClangModule(RD->getDefinition()))
2164 if (auto *ES = RD->getASTContext().getExternalSource())
2165 if (ES->hasExternalDefinitions(RD) == ExternalASTSource::EK_Always)
2168 if (DebugKind > codegenoptions::LimitedDebugInfo)
2171 if (!LangOpts.CPlusPlus)
2174 if (!RD->isCompleteDefinitionRequired())
2177 const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
2182 // Only emit complete debug info for a dynamic class when its vtable is
2183 // emitted. However, Microsoft debuggers don't resolve type information
2184 // across DLL boundaries, so skip this optimization if the class or any of its
2185 // methods are marked dllimport. This isn't a complete solution, since objects
2186 // without any dllimport methods can be used in one DLL and constructed in
2187 // another, but it is the current behavior of LimitedDebugInfo.
2188 if (CXXDecl->hasDefinition() && CXXDecl->isDynamicClass() &&
2189 !isClassOrMethodDLLImport(CXXDecl))
2192 TemplateSpecializationKind Spec = TSK_Undeclared;
2193 if (const auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(RD))
2194 Spec = SD->getSpecializationKind();
2196 if (Spec == TSK_ExplicitInstantiationDeclaration &&
2197 hasExplicitMemberDefinition(CXXDecl->method_begin(),
2198 CXXDecl->method_end()))
2204 void CGDebugInfo::completeRequiredType(const RecordDecl *RD) {
2205 if (shouldOmitDefinition(DebugKind, DebugTypeExtRefs, RD, CGM.getLangOpts()))
2208 QualType Ty = CGM.getContext().getRecordType(RD);
2209 llvm::DIType *T = getTypeOrNull(Ty);
2210 if (T && T->isForwardDecl())
2211 completeClassData(RD);
2214 llvm::DIType *CGDebugInfo::CreateType(const RecordType *Ty) {
2215 RecordDecl *RD = Ty->getDecl();
2216 llvm::DIType *T = cast_or_null<llvm::DIType>(getTypeOrNull(QualType(Ty, 0)));
2217 if (T || shouldOmitDefinition(DebugKind, DebugTypeExtRefs, RD,
2218 CGM.getLangOpts())) {
2220 T = getOrCreateRecordFwdDecl(Ty, getDeclContextDescriptor(RD));
2224 return CreateTypeDefinition(Ty);
2227 llvm::DIType *CGDebugInfo::CreateTypeDefinition(const RecordType *Ty) {
2228 RecordDecl *RD = Ty->getDecl();
2230 // Get overall information about the record type for the debug info.
2231 llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
2233 // Records and classes and unions can all be recursive. To handle them, we
2234 // first generate a debug descriptor for the struct as a forward declaration.
2235 // Then (if it is a definition) we go through and get debug info for all of
2236 // its members. Finally, we create a descriptor for the complete type (which
2237 // may refer to the forward decl if the struct is recursive) and replace all
2238 // uses of the forward declaration with the final definition.
2239 llvm::DICompositeType *FwdDecl = getOrCreateLimitedType(Ty, DefUnit);
2241 const RecordDecl *D = RD->getDefinition();
2242 if (!D || !D->isCompleteDefinition())
2245 if (const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD))
2246 CollectContainingType(CXXDecl, FwdDecl);
2248 // Push the struct on region stack.
2249 LexicalBlockStack.emplace_back(&*FwdDecl);
2250 RegionMap[Ty->getDecl()].reset(FwdDecl);
2252 // Convert all the elements.
2253 SmallVector<llvm::Metadata *, 16> EltTys;
2254 // what about nested types?
2256 // Note: The split of CXXDecl information here is intentional, the
2257 // gdb tests will depend on a certain ordering at printout. The debug
2258 // information offsets are still correct if we merge them all together
2260 const auto *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
2262 CollectCXXBases(CXXDecl, DefUnit, EltTys, FwdDecl);
2263 CollectVTableInfo(CXXDecl, DefUnit, EltTys, FwdDecl);
2266 // Collect data fields (including static variables and any initializers).
2267 CollectRecordFields(RD, DefUnit, EltTys, FwdDecl);
2269 CollectCXXMemberFunctions(CXXDecl, DefUnit, EltTys, FwdDecl);
2271 LexicalBlockStack.pop_back();
2272 RegionMap.erase(Ty->getDecl());
2274 llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
2275 DBuilder.replaceArrays(FwdDecl, Elements);
2277 if (FwdDecl->isTemporary())
2279 llvm::MDNode::replaceWithPermanent(llvm::TempDICompositeType(FwdDecl));
2281 RegionMap[Ty->getDecl()].reset(FwdDecl);
2285 llvm::DIType *CGDebugInfo::CreateType(const ObjCObjectType *Ty,
2286 llvm::DIFile *Unit) {
2287 // Ignore protocols.
2288 return getOrCreateType(Ty->getBaseType(), Unit);
2291 llvm::DIType *CGDebugInfo::CreateType(const ObjCTypeParamType *Ty,
2292 llvm::DIFile *Unit) {
2293 // Ignore protocols.
2294 SourceLocation Loc = Ty->getDecl()->getLocation();
2296 // Use Typedefs to represent ObjCTypeParamType.
2297 return DBuilder.createTypedef(
2298 getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit),
2299 Ty->getDecl()->getName(), getOrCreateFile(Loc), getLineNumber(Loc),
2300 getDeclContextDescriptor(Ty->getDecl()));
2303 /// \return true if Getter has the default name for the property PD.
2304 static bool hasDefaultGetterName(const ObjCPropertyDecl *PD,
2305 const ObjCMethodDecl *Getter) {
2310 assert(Getter->getDeclName().isObjCZeroArgSelector());
2311 return PD->getName() ==
2312 Getter->getDeclName().getObjCSelector().getNameForSlot(0);
2315 /// \return true if Setter has the default name for the property PD.
2316 static bool hasDefaultSetterName(const ObjCPropertyDecl *PD,
2317 const ObjCMethodDecl *Setter) {
2322 assert(Setter->getDeclName().isObjCOneArgSelector());
2323 return SelectorTable::constructSetterName(PD->getName()) ==
2324 Setter->getDeclName().getObjCSelector().getNameForSlot(0);
2327 llvm::DIType *CGDebugInfo::CreateType(const ObjCInterfaceType *Ty,
2328 llvm::DIFile *Unit) {
2329 ObjCInterfaceDecl *ID = Ty->getDecl();
2333 // Return a forward declaration if this type was imported from a clang module,
2334 // and this is not the compile unit with the implementation of the type (which
2335 // may contain hidden ivars).
2336 if (DebugTypeExtRefs && ID->isFromASTFile() && ID->getDefinition() &&
2337 !ID->getImplementation())
2338 return DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
2340 getDeclContextDescriptor(ID), Unit, 0);
2342 // Get overall information about the record type for the debug info.
2343 llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
2344 unsigned Line = getLineNumber(ID->getLocation());
2346 static_cast<llvm::dwarf::SourceLanguage>(TheCU->getSourceLanguage());
2348 // If this is just a forward declaration return a special forward-declaration
2349 // debug type since we won't be able to lay out the entire type.
2350 ObjCInterfaceDecl *Def = ID->getDefinition();
2351 if (!Def || !Def->getImplementation()) {
2352 llvm::DIScope *Mod = getParentModuleOrNull(ID);
2353 llvm::DIType *FwdDecl = DBuilder.createReplaceableCompositeType(
2354 llvm::dwarf::DW_TAG_structure_type, ID->getName(), Mod ? Mod : TheCU,
2355 DefUnit, Line, RuntimeLang);
2356 ObjCInterfaceCache.push_back(ObjCInterfaceCacheEntry(Ty, FwdDecl, Unit));
2360 return CreateTypeDefinition(Ty, Unit);
2364 CGDebugInfo::getOrCreateModuleRef(ExternalASTSource::ASTSourceDescriptor Mod,
2365 bool CreateSkeletonCU) {
2366 // Use the Module pointer as the key into the cache. This is a
2367 // nullptr if the "Module" is a PCH, which is safe because we don't
2368 // support chained PCH debug info, so there can only be a single PCH.
2369 const Module *M = Mod.getModuleOrNull();
2370 auto ModRef = ModuleCache.find(M);
2371 if (ModRef != ModuleCache.end())
2372 return cast<llvm::DIModule>(ModRef->second);
2374 // Macro definitions that were defined with "-D" on the command line.
2375 SmallString<128> ConfigMacros;
2377 llvm::raw_svector_ostream OS(ConfigMacros);
2378 const auto &PPOpts = CGM.getPreprocessorOpts();
2380 // Translate the macro definitions back into a command line.
2381 for (auto &M : PPOpts.Macros) {
2384 const std::string &Macro = M.first;
2385 bool Undef = M.second;
2386 OS << "\"-" << (Undef ? 'U' : 'D');
2387 for (char c : Macro)
2402 bool IsRootModule = M ? !M->Parent : true;
2403 // When a module name is specified as -fmodule-name, that module gets a
2404 // clang::Module object, but it won't actually be built or imported; it will
2406 if (CreateSkeletonCU && IsRootModule && Mod.getASTFile().empty() && M)
2407 assert(StringRef(M->Name).startswith(CGM.getLangOpts().ModuleName) &&
2408 "clang module without ASTFile must be specified by -fmodule-name");
2410 if (CreateSkeletonCU && IsRootModule && !Mod.getASTFile().empty()) {
2411 // PCH files don't have a signature field in the control block,
2412 // but LLVM detects skeleton CUs by looking for a non-zero DWO id.
2413 // We use the lower 64 bits for debug info.
2414 uint64_t Signature =
2416 ? (uint64_t)Mod.getSignature()[1] << 32 | Mod.getSignature()[0]
2418 llvm::DIBuilder DIB(CGM.getModule());
2419 DIB.createCompileUnit(TheCU->getSourceLanguage(),
2420 // TODO: Support "Source" from external AST providers?
2421 DIB.createFile(Mod.getModuleName(), Mod.getPath()),
2422 TheCU->getProducer(), true, StringRef(), 0,
2423 Mod.getASTFile(), llvm::DICompileUnit::FullDebug,
2428 llvm::DIModule *Parent =
2429 IsRootModule ? nullptr
2430 : getOrCreateModuleRef(
2431 ExternalASTSource::ASTSourceDescriptor(*M->Parent),
2433 llvm::DIModule *DIMod =
2434 DBuilder.createModule(Parent, Mod.getModuleName(), ConfigMacros,
2435 Mod.getPath(), CGM.getHeaderSearchOpts().Sysroot);
2436 ModuleCache[M].reset(DIMod);
2440 llvm::DIType *CGDebugInfo::CreateTypeDefinition(const ObjCInterfaceType *Ty,
2441 llvm::DIFile *Unit) {
2442 ObjCInterfaceDecl *ID = Ty->getDecl();
2443 llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
2444 unsigned Line = getLineNumber(ID->getLocation());
2445 unsigned RuntimeLang = TheCU->getSourceLanguage();
2447 // Bit size, align and offset of the type.
2448 uint64_t Size = CGM.getContext().getTypeSize(Ty);
2449 auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
2451 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
2452 if (ID->getImplementation())
2453 Flags |= llvm::DINode::FlagObjcClassComplete;
2455 llvm::DIScope *Mod = getParentModuleOrNull(ID);
2456 llvm::DICompositeType *RealDecl = DBuilder.createStructType(
2457 Mod ? Mod : Unit, ID->getName(), DefUnit, Line, Size, Align, Flags,
2458 nullptr, llvm::DINodeArray(), RuntimeLang);
2460 QualType QTy(Ty, 0);
2461 TypeCache[QTy.getAsOpaquePtr()].reset(RealDecl);
2463 // Push the struct on region stack.
2464 LexicalBlockStack.emplace_back(RealDecl);
2465 RegionMap[Ty->getDecl()].reset(RealDecl);
2467 // Convert all the elements.
2468 SmallVector<llvm::Metadata *, 16> EltTys;
2470 ObjCInterfaceDecl *SClass = ID->getSuperClass();
2472 llvm::DIType *SClassTy =
2473 getOrCreateType(CGM.getContext().getObjCInterfaceType(SClass), Unit);
2477 llvm::DIType *InhTag = DBuilder.createInheritance(RealDecl, SClassTy, 0, 0,
2478 llvm::DINode::FlagZero);
2479 EltTys.push_back(InhTag);
2482 // Create entries for all of the properties.
2483 auto AddProperty = [&](const ObjCPropertyDecl *PD) {
2484 SourceLocation Loc = PD->getLocation();
2485 llvm::DIFile *PUnit = getOrCreateFile(Loc);
2486 unsigned PLine = getLineNumber(Loc);
2487 ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
2488 ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
2489 llvm::MDNode *PropertyNode = DBuilder.createObjCProperty(
2490 PD->getName(), PUnit, PLine,
2491 hasDefaultGetterName(PD, Getter) ? ""
2492 : getSelectorName(PD->getGetterName()),
2493 hasDefaultSetterName(PD, Setter) ? ""
2494 : getSelectorName(PD->getSetterName()),
2495 PD->getPropertyAttributes(), getOrCreateType(PD->getType(), PUnit));
2496 EltTys.push_back(PropertyNode);
2499 llvm::SmallPtrSet<const IdentifierInfo *, 16> PropertySet;
2500 for (const ObjCCategoryDecl *ClassExt : ID->known_extensions())
2501 for (auto *PD : ClassExt->properties()) {
2502 PropertySet.insert(PD->getIdentifier());
2505 for (const auto *PD : ID->properties()) {
2506 // Don't emit duplicate metadata for properties that were already in a
2508 if (!PropertySet.insert(PD->getIdentifier()).second)
2514 const ASTRecordLayout &RL = CGM.getContext().getASTObjCInterfaceLayout(ID);
2515 unsigned FieldNo = 0;
2516 for (ObjCIvarDecl *Field = ID->all_declared_ivar_begin(); Field;
2517 Field = Field->getNextIvar(), ++FieldNo) {
2518 llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
2522 StringRef FieldName = Field->getName();
2524 // Ignore unnamed fields.
2525 if (FieldName.empty())
2528 // Get the location for the field.
2529 llvm::DIFile *FieldDefUnit = getOrCreateFile(Field->getLocation());
2530 unsigned FieldLine = getLineNumber(Field->getLocation());
2531 QualType FType = Field->getType();
2532 uint64_t FieldSize = 0;
2533 uint32_t FieldAlign = 0;
2535 if (!FType->isIncompleteArrayType()) {
2537 // Bit size, align and offset of the type.
2538 FieldSize = Field->isBitField()
2539 ? Field->getBitWidthValue(CGM.getContext())
2540 : CGM.getContext().getTypeSize(FType);
2541 FieldAlign = getTypeAlignIfRequired(FType, CGM.getContext());
2544 uint64_t FieldOffset;
2545 if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
2546 // We don't know the runtime offset of an ivar if we're using the
2547 // non-fragile ABI. For bitfields, use the bit offset into the first
2548 // byte of storage of the bitfield. For other fields, use zero.
2549 if (Field->isBitField()) {
2551 CGM.getObjCRuntime().ComputeBitfieldBitOffset(CGM, ID, Field);
2552 FieldOffset %= CGM.getContext().getCharWidth();
2557 FieldOffset = RL.getFieldOffset(FieldNo);
2560 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
2561 if (Field->getAccessControl() == ObjCIvarDecl::Protected)
2562 Flags = llvm::DINode::FlagProtected;
2563 else if (Field->getAccessControl() == ObjCIvarDecl::Private)
2564 Flags = llvm::DINode::FlagPrivate;
2565 else if (Field->getAccessControl() == ObjCIvarDecl::Public)
2566 Flags = llvm::DINode::FlagPublic;
2568 llvm::MDNode *PropertyNode = nullptr;
2569 if (ObjCImplementationDecl *ImpD = ID->getImplementation()) {
2570 if (ObjCPropertyImplDecl *PImpD =
2571 ImpD->FindPropertyImplIvarDecl(Field->getIdentifier())) {
2572 if (ObjCPropertyDecl *PD = PImpD->getPropertyDecl()) {
2573 SourceLocation Loc = PD->getLocation();
2574 llvm::DIFile *PUnit = getOrCreateFile(Loc);
2575 unsigned PLine = getLineNumber(Loc);
2576 ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
2577 ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
2578 PropertyNode = DBuilder.createObjCProperty(
2579 PD->getName(), PUnit, PLine,
2580 hasDefaultGetterName(PD, Getter)
2582 : getSelectorName(PD->getGetterName()),
2583 hasDefaultSetterName(PD, Setter)
2585 : getSelectorName(PD->getSetterName()),
2586 PD->getPropertyAttributes(),
2587 getOrCreateType(PD->getType(), PUnit));
2591 FieldTy = DBuilder.createObjCIVar(FieldName, FieldDefUnit, FieldLine,
2592 FieldSize, FieldAlign, FieldOffset, Flags,
2593 FieldTy, PropertyNode);
2594 EltTys.push_back(FieldTy);
2597 llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
2598 DBuilder.replaceArrays(RealDecl, Elements);
2600 LexicalBlockStack.pop_back();
2604 llvm::DIType *CGDebugInfo::CreateType(const VectorType *Ty,
2605 llvm::DIFile *Unit) {
2606 llvm::DIType *ElementTy = getOrCreateType(Ty->getElementType(), Unit);
2607 int64_t Count = Ty->getNumElements();
2609 llvm::Metadata *Subscript;
2610 QualType QTy(Ty, 0);
2611 auto SizeExpr = SizeExprCache.find(QTy);
2612 if (SizeExpr != SizeExprCache.end())
2613 Subscript = DBuilder.getOrCreateSubrange(0, SizeExpr->getSecond());
2615 Subscript = DBuilder.getOrCreateSubrange(0, Count ? Count : -1);
2616 llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
2618 uint64_t Size = CGM.getContext().getTypeSize(Ty);
2619 auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
2621 return DBuilder.createVectorType(Size, Align, ElementTy, SubscriptArray);
2624 llvm::DIType *CGDebugInfo::CreateType(const ArrayType *Ty, llvm::DIFile *Unit) {
2628 // FIXME: make getTypeAlign() aware of VLAs and incomplete array types
2629 if (const auto *VAT = dyn_cast<VariableArrayType>(Ty)) {
2631 Align = getTypeAlignIfRequired(CGM.getContext().getBaseElementType(VAT),
2633 } else if (Ty->isIncompleteArrayType()) {
2635 if (Ty->getElementType()->isIncompleteType())
2638 Align = getTypeAlignIfRequired(Ty->getElementType(), CGM.getContext());
2639 } else if (Ty->isIncompleteType()) {
2643 // Size and align of the whole array, not the element type.
2644 Size = CGM.getContext().getTypeSize(Ty);
2645 Align = getTypeAlignIfRequired(Ty, CGM.getContext());
2648 // Add the dimensions of the array. FIXME: This loses CV qualifiers from
2649 // interior arrays, do we care? Why aren't nested arrays represented the
2650 // obvious/recursive way?
2651 SmallVector<llvm::Metadata *, 8> Subscripts;
2652 QualType EltTy(Ty, 0);
2653 while ((Ty = dyn_cast<ArrayType>(EltTy))) {
2654 // If the number of elements is known, then count is that number. Otherwise,
2655 // it's -1. This allows us to represent a subrange with an array of 0
2656 // elements, like this:
2661 int64_t Count = -1; // Count == -1 is an unbounded array.
2662 if (const auto *CAT = dyn_cast<ConstantArrayType>(Ty))
2663 Count = CAT->getSize().getZExtValue();
2664 else if (const auto *VAT = dyn_cast<VariableArrayType>(Ty)) {
2665 if (Expr *Size = VAT->getSizeExpr()) {
2666 Expr::EvalResult Result;
2667 if (Size->EvaluateAsInt(Result, CGM.getContext()))
2668 Count = Result.Val.getInt().getExtValue();
2672 auto SizeNode = SizeExprCache.find(EltTy);
2673 if (SizeNode != SizeExprCache.end())
2674 Subscripts.push_back(
2675 DBuilder.getOrCreateSubrange(0, SizeNode->getSecond()));
2677 Subscripts.push_back(DBuilder.getOrCreateSubrange(0, Count));
2678 EltTy = Ty->getElementType();
2681 llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscripts);
2683 return DBuilder.createArrayType(Size, Align, getOrCreateType(EltTy, Unit),
2687 llvm::DIType *CGDebugInfo::CreateType(const LValueReferenceType *Ty,
2688 llvm::DIFile *Unit) {
2689 return CreatePointerLikeType(llvm::dwarf::DW_TAG_reference_type, Ty,
2690 Ty->getPointeeType(), Unit);
2693 llvm::DIType *CGDebugInfo::CreateType(const RValueReferenceType *Ty,
2694 llvm::DIFile *Unit) {
2695 return CreatePointerLikeType(llvm::dwarf::DW_TAG_rvalue_reference_type, Ty,
2696 Ty->getPointeeType(), Unit);
2699 llvm::DIType *CGDebugInfo::CreateType(const MemberPointerType *Ty,
2701 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
2704 if (!Ty->isIncompleteType()) {
2705 Size = CGM.getContext().getTypeSize(Ty);
2707 // Set the MS inheritance model. There is no flag for the unspecified model.
2708 if (CGM.getTarget().getCXXABI().isMicrosoft()) {
2709 switch (Ty->getMostRecentCXXRecordDecl()->getMSInheritanceModel()) {
2710 case MSInheritanceAttr::Keyword_single_inheritance:
2711 Flags |= llvm::DINode::FlagSingleInheritance;
2713 case MSInheritanceAttr::Keyword_multiple_inheritance:
2714 Flags |= llvm::DINode::FlagMultipleInheritance;
2716 case MSInheritanceAttr::Keyword_virtual_inheritance:
2717 Flags |= llvm::DINode::FlagVirtualInheritance;
2719 case MSInheritanceAttr::Keyword_unspecified_inheritance:
2721 case MSInheritanceAttr::SpellingNotCalculated:
2722 llvm_unreachable("Spelling not yet calculated");
2727 llvm::DIType *ClassType = getOrCreateType(QualType(Ty->getClass(), 0), U);
2728 if (Ty->isMemberDataPointerType())
2729 return DBuilder.createMemberPointerType(
2730 getOrCreateType(Ty->getPointeeType(), U), ClassType, Size, /*Align=*/0,
2733 const FunctionProtoType *FPT =
2734 Ty->getPointeeType()->getAs<FunctionProtoType>();
2735 return DBuilder.createMemberPointerType(
2736 getOrCreateInstanceMethodType(
2737 CXXMethodDecl::getThisType(FPT, Ty->getMostRecentCXXRecordDecl()),
2739 ClassType, Size, /*Align=*/0, Flags);
2742 llvm::DIType *CGDebugInfo::CreateType(const AtomicType *Ty, llvm::DIFile *U) {
2743 auto *FromTy = getOrCreateType(Ty->getValueType(), U);
2744 return DBuilder.createQualifiedType(llvm::dwarf::DW_TAG_atomic_type, FromTy);
2747 llvm::DIType *CGDebugInfo::CreateType(const PipeType *Ty, llvm::DIFile *U) {
2748 return getOrCreateType(Ty->getElementType(), U);
2751 llvm::DIType *CGDebugInfo::CreateEnumType(const EnumType *Ty) {
2752 const EnumDecl *ED = Ty->getDecl();
2756 if (!ED->getTypeForDecl()->isIncompleteType()) {
2757 Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
2758 Align = getDeclAlignIfRequired(ED, CGM.getContext());
2761 SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);
2763 bool isImportedFromModule =
2764 DebugTypeExtRefs && ED->isFromASTFile() && ED->getDefinition();
2766 // If this is just a forward declaration, construct an appropriately
2767 // marked node and just return it.
2768 if (isImportedFromModule || !ED->getDefinition()) {
2769 // Note that it is possible for enums to be created as part of
2770 // their own declcontext. In this case a FwdDecl will be created
2771 // twice. This doesn't cause a problem because both FwdDecls are
2772 // entered into the ReplaceMap: finalize() will replace the first
2773 // FwdDecl with the second and then replace the second with
2775 llvm::DIScope *EDContext = getDeclContextDescriptor(ED);
2776 llvm::DIFile *DefUnit = getOrCreateFile(ED->getLocation());
2777 llvm::TempDIScope TmpContext(DBuilder.createReplaceableCompositeType(
2778 llvm::dwarf::DW_TAG_enumeration_type, "", TheCU, DefUnit, 0));
2780 unsigned Line = getLineNumber(ED->getLocation());
2781 StringRef EDName = ED->getName();
2782 llvm::DIType *RetTy = DBuilder.createReplaceableCompositeType(
2783 llvm::dwarf::DW_TAG_enumeration_type, EDName, EDContext, DefUnit, Line,
2784 0, Size, Align, llvm::DINode::FlagFwdDecl, Identifier);
2786 ReplaceMap.emplace_back(
2787 std::piecewise_construct, std::make_tuple(Ty),
2788 std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
2792 return CreateTypeDefinition(Ty);
2795 llvm::DIType *CGDebugInfo::CreateTypeDefinition(const EnumType *Ty) {
2796 const EnumDecl *ED = Ty->getDecl();
2799 if (!ED->getTypeForDecl()->isIncompleteType()) {
2800 Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
2801 Align = getDeclAlignIfRequired(ED, CGM.getContext());
2804 SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);
2806 // Create elements for each enumerator.
2807 SmallVector<llvm::Metadata *, 16> Enumerators;
2808 ED = ED->getDefinition();
2809 bool IsSigned = ED->getIntegerType()->isSignedIntegerType();
2810 for (const auto *Enum : ED->enumerators()) {
2811 const auto &InitVal = Enum->getInitVal();
2812 auto Value = IsSigned ? InitVal.getSExtValue() : InitVal.getZExtValue();
2813 Enumerators.push_back(
2814 DBuilder.createEnumerator(Enum->getName(), Value, !IsSigned));
2817 // Return a CompositeType for the enum itself.
2818 llvm::DINodeArray EltArray = DBuilder.getOrCreateArray(Enumerators);
2820 llvm::DIFile *DefUnit = getOrCreateFile(ED->getLocation());
2821 unsigned Line = getLineNumber(ED->getLocation());
2822 llvm::DIScope *EnumContext = getDeclContextDescriptor(ED);
2823 llvm::DIType *ClassTy = getOrCreateType(ED->getIntegerType(), DefUnit);
2824 return DBuilder.createEnumerationType(EnumContext, ED->getName(), DefUnit,
2825 Line, Size, Align, EltArray, ClassTy,
2826 Identifier, ED->isScoped());
2829 llvm::DIMacro *CGDebugInfo::CreateMacro(llvm::DIMacroFile *Parent,
2830 unsigned MType, SourceLocation LineLoc,
2831 StringRef Name, StringRef Value) {
2832 unsigned Line = LineLoc.isInvalid() ? 0 : getLineNumber(LineLoc);
2833 return DBuilder.createMacro(Parent, Line, MType, Name, Value);
2836 llvm::DIMacroFile *CGDebugInfo::CreateTempMacroFile(llvm::DIMacroFile *Parent,
2837 SourceLocation LineLoc,
2838 SourceLocation FileLoc) {
2839 llvm::DIFile *FName = getOrCreateFile(FileLoc);
2840 unsigned Line = LineLoc.isInvalid() ? 0 : getLineNumber(LineLoc);
2841 return DBuilder.createTempMacroFile(Parent, Line, FName);
2844 static QualType UnwrapTypeForDebugInfo(QualType T, const ASTContext &C) {
2847 Qualifiers InnerQuals = T.getLocalQualifiers();
2848 // Qualifiers::operator+() doesn't like it if you add a Qualifier
2849 // that is already there.
2850 Quals += Qualifiers::removeCommonQualifiers(Quals, InnerQuals);
2851 Quals += InnerQuals;
2853 switch (T->getTypeClass()) {
2855 return C.getQualifiedType(T.getTypePtr(), Quals);
2856 case Type::TemplateSpecialization: {
2857 const auto *Spec = cast<TemplateSpecializationType>(T);
2858 if (Spec->isTypeAlias())
2859 return C.getQualifiedType(T.getTypePtr(), Quals);
2860 T = Spec->desugar();
2863 case Type::TypeOfExpr:
2864 T = cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType();
2867 T = cast<TypeOfType>(T)->getUnderlyingType();
2869 case Type::Decltype:
2870 T = cast<DecltypeType>(T)->getUnderlyingType();
2872 case Type::UnaryTransform:
2873 T = cast<UnaryTransformType>(T)->getUnderlyingType();
2875 case Type::Attributed:
2876 T = cast<AttributedType>(T)->getEquivalentType();
2878 case Type::Elaborated:
2879 T = cast<ElaboratedType>(T)->getNamedType();
2882 T = cast<ParenType>(T)->getInnerType();
2884 case Type::MacroQualified:
2885 T = cast<MacroQualifiedType>(T)->getUnderlyingType();
2887 case Type::SubstTemplateTypeParm:
2888 T = cast<SubstTemplateTypeParmType>(T)->getReplacementType();
2891 case Type::DeducedTemplateSpecialization: {
2892 QualType DT = cast<DeducedType>(T)->getDeducedType();
2893 assert(!DT.isNull() && "Undeduced types shouldn't reach here.");
2897 case Type::Adjusted:
2899 // Decayed and adjusted types use the adjusted type in LLVM and DWARF.
2900 T = cast<AdjustedType>(T)->getAdjustedType();
2904 assert(T != LastT && "Type unwrapping failed to unwrap!");
2909 llvm::DIType *CGDebugInfo::getTypeOrNull(QualType Ty) {
2911 // Unwrap the type as needed for debug information.
2912 Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
2914 auto It = TypeCache.find(Ty.getAsOpaquePtr());
2915 if (It != TypeCache.end()) {
2916 // Verify that the debug info still exists.
2917 if (llvm::Metadata *V = It->second)
2918 return cast<llvm::DIType>(V);
2924 void CGDebugInfo::completeTemplateDefinition(
2925 const ClassTemplateSpecializationDecl &SD) {
2926 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
2928 completeUnusedClass(SD);
2931 void CGDebugInfo::completeUnusedClass(const CXXRecordDecl &D) {
2932 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
2935 completeClassData(&D);
2936 // In case this type has no member function definitions being emitted, ensure
2938 RetainedTypes.push_back(CGM.getContext().getRecordType(&D).getAsOpaquePtr());
2941 llvm::DIType *CGDebugInfo::getOrCreateType(QualType Ty, llvm::DIFile *Unit) {
2945 // Unwrap the type as needed for debug information.
2946 Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
2948 if (auto *T = getTypeOrNull(Ty))
2951 llvm::DIType *Res = CreateTypeNode(Ty, Unit);
2952 void *TyPtr = Ty.getAsOpaquePtr();
2954 // And update the type cache.
2955 TypeCache[TyPtr].reset(Res);
2960 llvm::DIModule *CGDebugInfo::getParentModuleOrNull(const Decl *D) {
2961 // A forward declaration inside a module header does not belong to the module.
2962 if (isa<RecordDecl>(D) && !cast<RecordDecl>(D)->getDefinition())
2964 if (DebugTypeExtRefs && D->isFromASTFile()) {
2965 // Record a reference to an imported clang module or precompiled header.
2966 auto *Reader = CGM.getContext().getExternalSource();
2967 auto Idx = D->getOwningModuleID();
2968 auto Info = Reader->getSourceDescriptor(Idx);
2970 return getOrCreateModuleRef(*Info, /*SkeletonCU=*/true);
2971 } else if (ClangModuleMap) {
2972 // We are building a clang module or a precompiled header.
2974 // TODO: When D is a CXXRecordDecl or a C++ Enum, the ODR applies
2975 // and it wouldn't be necessary to specify the parent scope
2976 // because the type is already unique by definition (it would look
2977 // like the output of -fno-standalone-debug). On the other hand,
2978 // the parent scope helps a consumer to quickly locate the object
2979 // file where the type's definition is located, so it might be
2980 // best to make this behavior a command line or debugger tuning
2982 if (Module *M = D->getOwningModule()) {
2983 // This is a (sub-)module.
2984 auto Info = ExternalASTSource::ASTSourceDescriptor(*M);
2985 return getOrCreateModuleRef(Info, /*SkeletonCU=*/false);
2987 // This the precompiled header being built.
2988 return getOrCreateModuleRef(PCHDescriptor, /*SkeletonCU=*/false);
2995 llvm::DIType *CGDebugInfo::CreateTypeNode(QualType Ty, llvm::DIFile *Unit) {
2996 // Handle qualifiers, which recursively handles what they refer to.
2997 if (Ty.hasLocalQualifiers())
2998 return CreateQualifiedType(Ty, Unit);
3000 // Work out details of type.
3001 switch (Ty->getTypeClass()) {
3002 #define TYPE(Class, Base)
3003 #define ABSTRACT_TYPE(Class, Base)
3004 #define NON_CANONICAL_TYPE(Class, Base)
3005 #define DEPENDENT_TYPE(Class, Base) case Type::Class:
3006 #include "clang/AST/TypeNodes.inc"
3007 llvm_unreachable("Dependent types cannot show up in debug information");
3009 case Type::ExtVector:
3011 return CreateType(cast<VectorType>(Ty), Unit);
3012 case Type::ObjCObjectPointer:
3013 return CreateType(cast<ObjCObjectPointerType>(Ty), Unit);
3014 case Type::ObjCObject:
3015 return CreateType(cast<ObjCObjectType>(Ty), Unit);
3016 case Type::ObjCTypeParam:
3017 return CreateType(cast<ObjCTypeParamType>(Ty), Unit);
3018 case Type::ObjCInterface:
3019 return CreateType(cast<ObjCInterfaceType>(Ty), Unit);
3021 return CreateType(cast<BuiltinType>(Ty));
3023 return CreateType(cast<ComplexType>(Ty));
3025 return CreateType(cast<PointerType>(Ty), Unit);
3026 case Type::BlockPointer:
3027 return CreateType(cast<BlockPointerType>(Ty), Unit);
3029 return CreateType(cast<TypedefType>(Ty), Unit);
3031 return CreateType(cast<RecordType>(Ty));
3033 return CreateEnumType(cast<EnumType>(Ty));
3034 case Type::FunctionProto:
3035 case Type::FunctionNoProto:
3036 return CreateType(cast<FunctionType>(Ty), Unit);
3037 case Type::ConstantArray:
3038 case Type::VariableArray:
3039 case Type::IncompleteArray:
3040 return CreateType(cast<ArrayType>(Ty), Unit);
3042 case Type::LValueReference:
3043 return CreateType(cast<LValueReferenceType>(Ty), Unit);
3044 case Type::RValueReference:
3045 return CreateType(cast<RValueReferenceType>(Ty), Unit);
3047 case Type::MemberPointer:
3048 return CreateType(cast<MemberPointerType>(Ty), Unit);
3051 return CreateType(cast<AtomicType>(Ty), Unit);
3054 return CreateType(cast<PipeType>(Ty), Unit);
3056 case Type::TemplateSpecialization:
3057 return CreateType(cast<TemplateSpecializationType>(Ty), Unit);
3060 case Type::Attributed:
3061 case Type::Adjusted:
3063 case Type::DeducedTemplateSpecialization:
3064 case Type::Elaborated:
3066 case Type::MacroQualified:
3067 case Type::SubstTemplateTypeParm:
3068 case Type::TypeOfExpr:
3070 case Type::Decltype:
3071 case Type::UnaryTransform:
3072 case Type::PackExpansion:
3076 llvm_unreachable("type should have been unwrapped!");
3079 llvm::DICompositeType *CGDebugInfo::getOrCreateLimitedType(const RecordType *Ty,
3080 llvm::DIFile *Unit) {
3081 QualType QTy(Ty, 0);
3083 auto *T = cast_or_null<llvm::DICompositeType>(getTypeOrNull(QTy));
3085 // We may have cached a forward decl when we could have created
3086 // a non-forward decl. Go ahead and create a non-forward decl
3088 if (T && !T->isForwardDecl())
3091 // Otherwise create the type.
3092 llvm::DICompositeType *Res = CreateLimitedType(Ty);
3094 // Propagate members from the declaration to the definition
3095 // CreateType(const RecordType*) will overwrite this with the members in the
3096 // correct order if the full type is needed.
3097 DBuilder.replaceArrays(Res, T ? T->getElements() : llvm::DINodeArray());
3099 // And update the type cache.
3100 TypeCache[QTy.getAsOpaquePtr()].reset(Res);
3104 // TODO: Currently used for context chains when limiting debug info.
3105 llvm::DICompositeType *CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
3106 RecordDecl *RD = Ty->getDecl();
3108 // Get overall information about the record type for the debug info.
3109 llvm::DIFile *DefUnit = getOrCreateFile(RD->getLocation());
3110 unsigned Line = getLineNumber(RD->getLocation());
3111 StringRef RDName = getClassName(RD);
3113 llvm::DIScope *RDContext = getDeclContextDescriptor(RD);
3115 // If we ended up creating the type during the context chain construction,
3116 // just return that.
3117 auto *T = cast_or_null<llvm::DICompositeType>(
3118 getTypeOrNull(CGM.getContext().getRecordType(RD)));
3119 if (T && (!T->isForwardDecl() || !RD->getDefinition()))
3122 // If this is just a forward or incomplete declaration, construct an
3123 // appropriately marked node and just return it.
3124 const RecordDecl *D = RD->getDefinition();
3125 if (!D || !D->isCompleteDefinition())
3126 return getOrCreateRecordFwdDecl(Ty, RDContext);
3128 uint64_t Size = CGM.getContext().getTypeSize(Ty);
3129 auto Align = getDeclAlignIfRequired(D, CGM.getContext());
3131 SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);
3133 // Explicitly record the calling convention and export symbols for C++
3135 auto Flags = llvm::DINode::FlagZero;
3136 if (auto CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
3137 if (CGM.getCXXABI().getRecordArgABI(CXXRD) == CGCXXABI::RAA_Indirect)
3138 Flags |= llvm::DINode::FlagTypePassByReference;
3140 Flags |= llvm::DINode::FlagTypePassByValue;
3142 // Record if a C++ record is non-trivial type.
3143 if (!CXXRD->isTrivial())
3144 Flags |= llvm::DINode::FlagNonTrivial;
3146 // Record exports it symbols to the containing structure.
3147 if (CXXRD->isAnonymousStructOrUnion())
3148 Flags |= llvm::DINode::FlagExportSymbols;
3151 llvm::DICompositeType *RealDecl = DBuilder.createReplaceableCompositeType(
3152 getTagForRecord(RD), RDName, RDContext, DefUnit, Line, 0, Size, Align,
3155 // Elements of composite types usually have back to the type, creating
3156 // uniquing cycles. Distinct nodes are more efficient.
3157 switch (RealDecl->getTag()) {
3159 llvm_unreachable("invalid composite type tag");
3161 case llvm::dwarf::DW_TAG_array_type:
3162 case llvm::dwarf::DW_TAG_enumeration_type:
3163 // Array elements and most enumeration elements don't have back references,
3164 // so they don't tend to be involved in uniquing cycles and there is some
3165 // chance of merging them when linking together two modules. Only make
3166 // them distinct if they are ODR-uniqued.
3167 if (Identifier.empty())
3171 case llvm::dwarf::DW_TAG_structure_type:
3172 case llvm::dwarf::DW_TAG_union_type:
3173 case llvm::dwarf::DW_TAG_class_type:
3174 // Immediately resolve to a distinct node.
3176 llvm::MDNode::replaceWithDistinct(llvm::TempDICompositeType(RealDecl));
3180 RegionMap[Ty->getDecl()].reset(RealDecl);
3181 TypeCache[QualType(Ty, 0).getAsOpaquePtr()].reset(RealDecl);
3183 if (const auto *TSpecial = dyn_cast<ClassTemplateSpecializationDecl>(RD))
3184 DBuilder.replaceArrays(RealDecl, llvm::DINodeArray(),
3185 CollectCXXTemplateParams(TSpecial, DefUnit));
3189 void CGDebugInfo::CollectContainingType(const CXXRecordDecl *RD,
3190 llvm::DICompositeType *RealDecl) {
3191 // A class's primary base or the class itself contains the vtable.
3192 llvm::DICompositeType *ContainingType = nullptr;
3193 const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
3194 if (const CXXRecordDecl *PBase = RL.getPrimaryBase()) {
3195 // Seek non-virtual primary base root.
3197 const ASTRecordLayout &BRL = CGM.getContext().getASTRecordLayout(PBase);
3198 const CXXRecordDecl *PBT = BRL.getPrimaryBase();
3199 if (PBT && !BRL.isPrimaryBaseVirtual())
3204 ContainingType = cast<llvm::DICompositeType>(
3205 getOrCreateType(QualType(PBase->getTypeForDecl(), 0),
3206 getOrCreateFile(RD->getLocation())));
3207 } else if (RD->isDynamicClass())
3208 ContainingType = RealDecl;
3210 DBuilder.replaceVTableHolder(RealDecl, ContainingType);
3213 llvm::DIType *CGDebugInfo::CreateMemberType(llvm::DIFile *Unit, QualType FType,
3214 StringRef Name, uint64_t *Offset) {
3215 llvm::DIType *FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
3216 uint64_t FieldSize = CGM.getContext().getTypeSize(FType);
3217 auto FieldAlign = getTypeAlignIfRequired(FType, CGM.getContext());
3219 DBuilder.createMemberType(Unit, Name, Unit, 0, FieldSize, FieldAlign,
3220 *Offset, llvm::DINode::FlagZero, FieldTy);
3221 *Offset += FieldSize;
3225 void CGDebugInfo::collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
3227 StringRef &LinkageName,
3228 llvm::DIScope *&FDContext,
3229 llvm::DINodeArray &TParamsArray,
3230 llvm::DINode::DIFlags &Flags) {
3231 const auto *FD = cast<FunctionDecl>(GD.getDecl());
3232 Name = getFunctionName(FD);
3233 // Use mangled name as linkage name for C/C++ functions.
3234 if (FD->hasPrototype()) {
3235 LinkageName = CGM.getMangledName(GD);
3236 Flags |= llvm::DINode::FlagPrototyped;
3238 // No need to replicate the linkage name if it isn't different from the
3239 // subprogram name, no need to have it at all unless coverage is enabled or
3240 // debug is set to more than just line tables or extra debug info is needed.
3241 if (LinkageName == Name || (!CGM.getCodeGenOpts().EmitGcovArcs &&
3242 !CGM.getCodeGenOpts().EmitGcovNotes &&
3243 !CGM.getCodeGenOpts().DebugInfoForProfiling &&
3244 DebugKind <= codegenoptions::DebugLineTablesOnly))
3245 LinkageName = StringRef();
3247 if (DebugKind >= codegenoptions::LimitedDebugInfo) {
3248 if (const NamespaceDecl *NSDecl =
3249 dyn_cast_or_null<NamespaceDecl>(FD->getDeclContext()))
3250 FDContext = getOrCreateNamespace(NSDecl);
3251 else if (const RecordDecl *RDecl =
3252 dyn_cast_or_null<RecordDecl>(FD->getDeclContext())) {
3253 llvm::DIScope *Mod = getParentModuleOrNull(RDecl);
3254 FDContext = getContextDescriptor(RDecl, Mod ? Mod : TheCU);
3256 // Check if it is a noreturn-marked function
3257 if (FD->isNoReturn())
3258 Flags |= llvm::DINode::FlagNoReturn;
3259 // Collect template parameters.
3260 TParamsArray = CollectFunctionTemplateParams(FD, Unit);
3264 void CGDebugInfo::collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
3265 unsigned &LineNo, QualType &T,
3266 StringRef &Name, StringRef &LinkageName,
3267 llvm::MDTuple *&TemplateParameters,
3268 llvm::DIScope *&VDContext) {
3269 Unit = getOrCreateFile(VD->getLocation());
3270 LineNo = getLineNumber(VD->getLocation());
3272 setLocation(VD->getLocation());
3275 if (T->isIncompleteArrayType()) {
3276 // CodeGen turns int[] into int[1] so we'll do the same here.
3277 llvm::APInt ConstVal(32, 1);
3278 QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
3280 T = CGM.getContext().getConstantArrayType(ET, ConstVal, nullptr,
3281 ArrayType::Normal, 0);
3284 Name = VD->getName();
3285 if (VD->getDeclContext() && !isa<FunctionDecl>(VD->getDeclContext()) &&
3286 !isa<ObjCMethodDecl>(VD->getDeclContext()))
3287 LinkageName = CGM.getMangledName(VD);
3288 if (LinkageName == Name)
3289 LinkageName = StringRef();
3291 if (isa<VarTemplateSpecializationDecl>(VD)) {
3292 llvm::DINodeArray parameterNodes = CollectVarTemplateParams(VD, &*Unit);
3293 TemplateParameters = parameterNodes.get();
3295 TemplateParameters = nullptr;
3298 // Since we emit declarations (DW_AT_members) for static members, place the
3299 // definition of those static members in the namespace they were declared in
3300 // in the source code (the lexical decl context).
3301 // FIXME: Generalize this for even non-member global variables where the
3302 // declaration and definition may have different lexical decl contexts, once
3303 // we have support for emitting declarations of (non-member) global variables.
3304 const DeclContext *DC = VD->isStaticDataMember() ? VD->getLexicalDeclContext()
3305 : VD->getDeclContext();
3306 // When a record type contains an in-line initialization of a static data
3307 // member, and the record type is marked as __declspec(dllexport), an implicit
3308 // definition of the member will be created in the record context. DWARF
3309 // doesn't seem to have a nice way to describe this in a form that consumers
3310 // are likely to understand, so fake the "normal" situation of a definition
3311 // outside the class by putting it in the global scope.
3313 DC = CGM.getContext().getTranslationUnitDecl();
3315 llvm::DIScope *Mod = getParentModuleOrNull(VD);
3316 VDContext = getContextDescriptor(cast<Decl>(DC), Mod ? Mod : TheCU);
3319 llvm::DISubprogram *CGDebugInfo::getFunctionFwdDeclOrStub(GlobalDecl GD,
3321 llvm::DINodeArray TParamsArray;
3322 StringRef Name, LinkageName;
3323 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
3324 llvm::DISubprogram::DISPFlags SPFlags = llvm::DISubprogram::SPFlagZero;
3325 SourceLocation Loc = GD.getDecl()->getLocation();
3326 llvm::DIFile *Unit = getOrCreateFile(Loc);
3327 llvm::DIScope *DContext = Unit;
3328 unsigned Line = getLineNumber(Loc);
3329 collectFunctionDeclProps(GD, Unit, Name, LinkageName, DContext, TParamsArray,
3331 auto *FD = cast<FunctionDecl>(GD.getDecl());
3333 // Build function type.
3334 SmallVector<QualType, 16> ArgTypes;
3335 for (const ParmVarDecl *Parm : FD->parameters())
3336 ArgTypes.push_back(Parm->getType());
3338 CallingConv CC = FD->getType()->castAs<FunctionType>()->getCallConv();
3339 QualType FnType = CGM.getContext().getFunctionType(
3340 FD->getReturnType(), ArgTypes, FunctionProtoType::ExtProtoInfo(CC));
3341 if (!FD->isExternallyVisible())
3342 SPFlags |= llvm::DISubprogram::SPFlagLocalToUnit;
3343 if (CGM.getLangOpts().Optimize)
3344 SPFlags |= llvm::DISubprogram::SPFlagOptimized;
3347 Flags |= getCallSiteRelatedAttrs();
3348 SPFlags |= llvm::DISubprogram::SPFlagDefinition;
3349 return DBuilder.createFunction(
3350 DContext, Name, LinkageName, Unit, Line,
3351 getOrCreateFunctionType(GD.getDecl(), FnType, Unit), 0, Flags, SPFlags,
3352 TParamsArray.get(), getFunctionDeclaration(FD));
3355 llvm::DISubprogram *SP = DBuilder.createTempFunctionFwdDecl(
3356 DContext, Name, LinkageName, Unit, Line,
3357 getOrCreateFunctionType(GD.getDecl(), FnType, Unit), 0, Flags, SPFlags,
3358 TParamsArray.get(), getFunctionDeclaration(FD));
3359 const FunctionDecl *CanonDecl = FD->getCanonicalDecl();
3360 FwdDeclReplaceMap.emplace_back(std::piecewise_construct,
3361 std::make_tuple(CanonDecl),
3362 std::make_tuple(SP));
3366 llvm::DISubprogram *CGDebugInfo::getFunctionForwardDeclaration(GlobalDecl GD) {
3367 return getFunctionFwdDeclOrStub(GD, /* Stub = */ false);
3370 llvm::DISubprogram *CGDebugInfo::getFunctionStub(GlobalDecl GD) {
3371 return getFunctionFwdDeclOrStub(GD, /* Stub = */ true);
3374 llvm::DIGlobalVariable *
3375 CGDebugInfo::getGlobalVariableForwardDeclaration(const VarDecl *VD) {
3377 StringRef Name, LinkageName;
3378 SourceLocation Loc = VD->getLocation();
3379 llvm::DIFile *Unit = getOrCreateFile(Loc);
3380 llvm::DIScope *DContext = Unit;
3381 unsigned Line = getLineNumber(Loc);
3382 llvm::MDTuple *TemplateParameters = nullptr;
3384 collectVarDeclProps(VD, Unit, Line, T, Name, LinkageName, TemplateParameters,
3386 auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
3387 auto *GV = DBuilder.createTempGlobalVariableFwdDecl(
3388 DContext, Name, LinkageName, Unit, Line, getOrCreateType(T, Unit),
3389 !VD->isExternallyVisible(), nullptr, TemplateParameters, Align);
3390 FwdDeclReplaceMap.emplace_back(
3391 std::piecewise_construct,
3392 std::make_tuple(cast<VarDecl>(VD->getCanonicalDecl())),
3393 std::make_tuple(static_cast<llvm::Metadata *>(GV)));
3397 llvm::DINode *CGDebugInfo::getDeclarationOrDefinition(const Decl *D) {
3398 // We only need a declaration (not a definition) of the type - so use whatever
3399 // we would otherwise do to get a type for a pointee. (forward declarations in
3400 // limited debug info, full definitions (if the type definition is available)
3401 // in unlimited debug info)
3402 if (const auto *TD = dyn_cast<TypeDecl>(D))
3403 return getOrCreateType(CGM.getContext().getTypeDeclType(TD),
3404 getOrCreateFile(TD->getLocation()));
3405 auto I = DeclCache.find(D->getCanonicalDecl());
3407 if (I != DeclCache.end()) {
3409 if (auto *GVE = dyn_cast_or_null<llvm::DIGlobalVariableExpression>(N))
3410 return GVE->getVariable();
3411 return dyn_cast_or_null<llvm::DINode>(N);
3414 // No definition for now. Emit a forward definition that might be
3415 // merged with a potential upcoming definition.
3416 if (const auto *FD = dyn_cast<FunctionDecl>(D))
3417 return getFunctionForwardDeclaration(FD);
3418 else if (const auto *VD = dyn_cast<VarDecl>(D))
3419 return getGlobalVariableForwardDeclaration(VD);
3424 llvm::DISubprogram *CGDebugInfo::getFunctionDeclaration(const Decl *D) {
3425 if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
3428 const auto *FD = dyn_cast<FunctionDecl>(D);
3433 auto *S = getDeclContextDescriptor(D);
3435 auto MI = SPCache.find(FD->getCanonicalDecl());
3436 if (MI == SPCache.end()) {
3437 if (const auto *MD = dyn_cast<CXXMethodDecl>(FD->getCanonicalDecl())) {
3438 return CreateCXXMemberFunction(MD, getOrCreateFile(MD->getLocation()),
3439 cast<llvm::DICompositeType>(S));
3442 if (MI != SPCache.end()) {
3443 auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
3444 if (SP && !SP->isDefinition())
3448 for (auto NextFD : FD->redecls()) {
3449 auto MI = SPCache.find(NextFD->getCanonicalDecl());
3450 if (MI != SPCache.end()) {
3451 auto *SP = dyn_cast_or_null<llvm::DISubprogram>(MI->second);
3452 if (SP && !SP->isDefinition())
3459 // getOrCreateFunctionType - Construct type. If it is a c++ method, include
3460 // implicit parameter "this".
3461 llvm::DISubroutineType *CGDebugInfo::getOrCreateFunctionType(const Decl *D,
3464 if (!D || DebugKind <= codegenoptions::DebugLineTablesOnly)
3465 // Create fake but valid subroutine type. Otherwise -verify would fail, and
3466 // subprogram DIE will miss DW_AT_decl_file and DW_AT_decl_line fields.
3467 return DBuilder.createSubroutineType(DBuilder.getOrCreateTypeArray(None));
3469 if (const auto *Method = dyn_cast<CXXMethodDecl>(D))
3470 return getOrCreateMethodType(Method, F);
3472 const auto *FTy = FnType->getAs<FunctionType>();
3473 CallingConv CC = FTy ? FTy->getCallConv() : CallingConv::CC_C;
3475 if (const auto *OMethod = dyn_cast<ObjCMethodDecl>(D)) {
3476 // Add "self" and "_cmd"
3477 SmallVector<llvm::Metadata *, 16> Elts;
3479 // First element is always return type. For 'void' functions it is NULL.
3480 QualType ResultTy = OMethod->getReturnType();
3482 // Replace the instancetype keyword with the actual type.
3483 if (ResultTy == CGM.getContext().getObjCInstanceType())
3484 ResultTy = CGM.getContext().getPointerType(
3485 QualType(OMethod->getClassInterface()->getTypeForDecl(), 0));
3487 Elts.push_back(getOrCreateType(ResultTy, F));
3488 // "self" pointer is always first argument.
3489 QualType SelfDeclTy;
3490 if (auto *SelfDecl = OMethod->getSelfDecl())
3491 SelfDeclTy = SelfDecl->getType();
3492 else if (auto *FPT = dyn_cast<FunctionProtoType>(FnType))
3493 if (FPT->getNumParams() > 1)
3494 SelfDeclTy = FPT->getParamType(0);
3495 if (!SelfDeclTy.isNull())
3497 CreateSelfType(SelfDeclTy, getOrCreateType(SelfDeclTy, F)));
3498 // "_cmd" pointer is always second argument.
3499 Elts.push_back(DBuilder.createArtificialType(
3500 getOrCreateType(CGM.getContext().getObjCSelType(), F)));
3501 // Get rest of the arguments.
3502 for (const auto *PI : OMethod->parameters())
3503 Elts.push_back(getOrCreateType(PI->getType(), F));
3504 // Variadic methods need a special marker at the end of the type list.
3505 if (OMethod->isVariadic())
3506 Elts.push_back(DBuilder.createUnspecifiedParameter());
3508 llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
3509 return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
3513 // Handle variadic function types; they need an additional
3514 // unspecified parameter.
3515 if (const auto *FD = dyn_cast<FunctionDecl>(D))
3516 if (FD->isVariadic()) {
3517 SmallVector<llvm::Metadata *, 16> EltTys;
3518 EltTys.push_back(getOrCreateType(FD->getReturnType(), F));
3519 if (const auto *FPT = dyn_cast<FunctionProtoType>(FnType))
3520 for (QualType ParamType : FPT->param_types())
3521 EltTys.push_back(getOrCreateType(ParamType, F));
3522 EltTys.push_back(DBuilder.createUnspecifiedParameter());
3523 llvm::DITypeRefArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
3524 return DBuilder.createSubroutineType(EltTypeArray, llvm::DINode::FlagZero,
3528 return cast<llvm::DISubroutineType>(getOrCreateType(FnType, F));
3531 void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
3532 SourceLocation ScopeLoc, QualType FnType,
3533 llvm::Function *Fn, bool CurFuncIsThunk,
3534 CGBuilderTy &Builder) {
3537 StringRef LinkageName;
3539 FnBeginRegionCount.push_back(LexicalBlockStack.size());
3541 const Decl *D = GD.getDecl();
3542 bool HasDecl = (D != nullptr);
3544 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
3545 llvm::DISubprogram::DISPFlags SPFlags = llvm::DISubprogram::SPFlagZero;
3546 llvm::DIFile *Unit = getOrCreateFile(Loc);
3547 llvm::DIScope *FDContext = Unit;
3548 llvm::DINodeArray TParamsArray;
3550 // Use llvm function name.
3551 LinkageName = Fn->getName();
3552 } else if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
3553 // If there is a subprogram for this function available then use it.
3554 auto FI = SPCache.find(FD->getCanonicalDecl());
3555 if (FI != SPCache.end()) {
3556 auto *SP = dyn_cast_or_null<llvm::DISubprogram>(FI->second);
3557 if (SP && SP->isDefinition()) {
3558 LexicalBlockStack.emplace_back(SP);
3559 RegionMap[D].reset(SP);
3563 collectFunctionDeclProps(GD, Unit, Name, LinkageName, FDContext,
3564 TParamsArray, Flags);
3565 } else if (const auto *OMD = dyn_cast<ObjCMethodDecl>(D)) {
3566 Name = getObjCMethodName(OMD);
3567 Flags |= llvm::DINode::FlagPrototyped;
3568 } else if (isa<VarDecl>(D) &&
3569 GD.getDynamicInitKind() != DynamicInitKind::NoStub) {
3570 // This is a global initializer or atexit destructor for a global variable.
3571 Name = getDynamicInitializerName(cast<VarDecl>(D), GD.getDynamicInitKind(),
3574 // Use llvm function name.
3575 Name = Fn->getName();
3576 Flags |= llvm::DINode::FlagPrototyped;
3578 if (Name.startswith("\01"))
3579 Name = Name.substr(1);
3581 if (!HasDecl || D->isImplicit() || D->hasAttr<ArtificialAttr>()) {
3582 Flags |= llvm::DINode::FlagArtificial;
3583 // Artificial functions should not silently reuse CurLoc.
3584 CurLoc = SourceLocation();
3588 Flags |= llvm::DINode::FlagThunk;
3590 if (Fn->hasLocalLinkage())
3591 SPFlags |= llvm::DISubprogram::SPFlagLocalToUnit;
3592 if (CGM.getLangOpts().Optimize)
3593 SPFlags |= llvm::DISubprogram::SPFlagOptimized;
3595 llvm::DINode::DIFlags FlagsForDef = Flags | getCallSiteRelatedAttrs();
3596 llvm::DISubprogram::DISPFlags SPFlagsForDef =
3597 SPFlags | llvm::DISubprogram::SPFlagDefinition;
3599 unsigned LineNo = getLineNumber(Loc);
3600 unsigned ScopeLine = getLineNumber(ScopeLoc);
3602 // FIXME: The function declaration we're constructing here is mostly reusing
3603 // declarations from CXXMethodDecl and not constructing new ones for arbitrary
3604 // FunctionDecls. When/if we fix this we can have FDContext be TheCU/null for
3605 // all subprograms instead of the actual context since subprogram definitions
3606 // are emitted as CU level entities by the backend.
3607 llvm::DISubprogram *SP = DBuilder.createFunction(
3608 FDContext, Name, LinkageName, Unit, LineNo,
3609 getOrCreateFunctionType(D, FnType, Unit), ScopeLine, FlagsForDef,
3610 SPFlagsForDef, TParamsArray.get(), getFunctionDeclaration(D));
3611 Fn->setSubprogram(SP);
3612 // We might get here with a VarDecl in the case we're generating
3613 // code for the initialization of globals. Do not record these decls
3614 // as they will overwrite the actual VarDecl Decl in the cache.
3615 if (HasDecl && isa<FunctionDecl>(D))
3616 DeclCache[D->getCanonicalDecl()].reset(SP);
3618 // We use the SPDefCache only in the case when the debug entry values option
3619 // is set, in order to speed up parameters modification analysis.
3621 // FIXME: Use AbstractCallee here to support ObjCMethodDecl.
3622 if (CGM.getCodeGenOpts().EnableDebugEntryValues && HasDecl)
3623 if (auto *FD = dyn_cast<FunctionDecl>(D))
3624 if (FD->hasBody() && !FD->param_empty())
3625 SPDefCache[FD].reset(SP);
3627 if (CGM.getCodeGenOpts().DwarfVersion >= 5) {
3628 // Starting with DWARF V5 method declarations are emitted as children of
3629 // the interface type.
3630 if (const auto *OMD = dyn_cast_or_null<ObjCMethodDecl>(D)) {
3631 const ObjCInterfaceDecl *ID = OMD->getClassInterface();
3632 QualType QTy(ID->getTypeForDecl(), 0);
3633 auto It = TypeCache.find(QTy.getAsOpaquePtr());
3634 if (It != TypeCache.end()) {
3635 llvm::DICompositeType *InterfaceDecl =
3636 cast<llvm::DICompositeType>(It->second);
3637 llvm::DISubprogram *FD = DBuilder.createFunction(
3638 InterfaceDecl, Name, LinkageName, Unit, LineNo,
3639 getOrCreateFunctionType(D, FnType, Unit), ScopeLine, Flags, SPFlags,
3640 TParamsArray.get());
3641 DBuilder.finalizeSubprogram(FD);
3642 ObjCMethodCache[ID].push_back(FD);
3647 // Push the function onto the lexical block stack.
3648 LexicalBlockStack.emplace_back(SP);
3651 RegionMap[D].reset(SP);
3654 void CGDebugInfo::EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc,
3655 QualType FnType, llvm::Function *Fn) {
3657 StringRef LinkageName;
3659 const Decl *D = GD.getDecl();
3663 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
3664 llvm::DIFile *Unit = getOrCreateFile(Loc);
3665 bool IsDeclForCallSite = Fn ? true : false;
3666 llvm::DIScope *FDContext =
3667 IsDeclForCallSite ? Unit : getDeclContextDescriptor(D);
3668 llvm::DINodeArray TParamsArray;
3669 if (isa<FunctionDecl>(D)) {
3670 // If there is a DISubprogram for this function available then use it.
3671 collectFunctionDeclProps(GD, Unit, Name, LinkageName, FDContext,
3672 TParamsArray, Flags);
3673 } else if (const auto *OMD = dyn_cast<ObjCMethodDecl>(D)) {
3674 Name = getObjCMethodName(OMD);
3675 Flags |= llvm::DINode::FlagPrototyped;
3677 llvm_unreachable("not a function or ObjC method");
3679 if (!Name.empty() && Name[0] == '\01')
3680 Name = Name.substr(1);
3682 if (D->isImplicit()) {
3683 Flags |= llvm::DINode::FlagArtificial;
3684 // Artificial functions without a location should not silently reuse CurLoc.
3685 if (Loc.isInvalid())
3686 CurLoc = SourceLocation();
3688 unsigned LineNo = getLineNumber(Loc);
3689 unsigned ScopeLine = 0;
3690 llvm::DISubprogram::DISPFlags SPFlags = llvm::DISubprogram::SPFlagZero;
3691 if (CGM.getLangOpts().Optimize)
3692 SPFlags |= llvm::DISubprogram::SPFlagOptimized;
3694 llvm::DISubprogram *SP = DBuilder.createFunction(
3695 FDContext, Name, LinkageName, Unit, LineNo,
3696 getOrCreateFunctionType(D, FnType, Unit), ScopeLine, Flags, SPFlags,
3697 TParamsArray.get(), getFunctionDeclaration(D));
3699 if (IsDeclForCallSite)
3700 Fn->setSubprogram(SP);
3702 DBuilder.retainType(SP);
3705 void CGDebugInfo::EmitFuncDeclForCallSite(llvm::CallBase *CallOrInvoke,
3706 QualType CalleeType,
3707 const FunctionDecl *CalleeDecl) {
3708 auto &CGOpts = CGM.getCodeGenOpts();
3709 if (!CGOpts.EnableDebugEntryValues || !CGM.getLangOpts().Optimize ||
3713 auto *Func = CallOrInvoke->getCalledFunction();
3717 // If there is no DISubprogram attached to the function being called,
3718 // create the one describing the function in order to have complete
3719 // call site debug info.
3720 if (Func->getSubprogram())
3723 if (!CalleeDecl->isStatic() && !CalleeDecl->isInlined())
3724 EmitFunctionDecl(CalleeDecl, CalleeDecl->getLocation(), CalleeType, Func);
3727 void CGDebugInfo::EmitInlineFunctionStart(CGBuilderTy &Builder, GlobalDecl GD) {
3728 const auto *FD = cast<FunctionDecl>(GD.getDecl());
3729 // If there is a subprogram for this function available then use it.
3730 auto FI = SPCache.find(FD->getCanonicalDecl());
3731 llvm::DISubprogram *SP = nullptr;
3732 if (FI != SPCache.end())
3733 SP = dyn_cast_or_null<llvm::DISubprogram>(FI->second);
3734 if (!SP || !SP->isDefinition())
3735 SP = getFunctionStub(GD);
3736 FnBeginRegionCount.push_back(LexicalBlockStack.size());
3737 LexicalBlockStack.emplace_back(SP);
3738 setInlinedAt(Builder.getCurrentDebugLocation());
3739 EmitLocation(Builder, FD->getLocation());
3742 void CGDebugInfo::EmitInlineFunctionEnd(CGBuilderTy &Builder) {
3743 assert(CurInlinedAt && "unbalanced inline scope stack");
3744 EmitFunctionEnd(Builder, nullptr);
3745 setInlinedAt(llvm::DebugLoc(CurInlinedAt).getInlinedAt());
3748 void CGDebugInfo::EmitLocation(CGBuilderTy &Builder, SourceLocation Loc) {
3749 // Update our current location
3752 if (CurLoc.isInvalid() || CurLoc.isMacroID() || LexicalBlockStack.empty())
3755 llvm::MDNode *Scope = LexicalBlockStack.back();
3756 Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
3757 getLineNumber(CurLoc), getColumnNumber(CurLoc), Scope, CurInlinedAt));
3760 void CGDebugInfo::CreateLexicalBlock(SourceLocation Loc) {
3761 llvm::MDNode *Back = nullptr;
3762 if (!LexicalBlockStack.empty())
3763 Back = LexicalBlockStack.back().get();
3764 LexicalBlockStack.emplace_back(DBuilder.createLexicalBlock(
3765 cast<llvm::DIScope>(Back), getOrCreateFile(CurLoc), getLineNumber(CurLoc),
3766 getColumnNumber(CurLoc)));
3769 void CGDebugInfo::AppendAddressSpaceXDeref(
3770 unsigned AddressSpace, SmallVectorImpl<int64_t> &Expr) const {
3771 Optional<unsigned> DWARFAddressSpace =
3772 CGM.getTarget().getDWARFAddressSpace(AddressSpace);
3773 if (!DWARFAddressSpace)
3776 Expr.push_back(llvm::dwarf::DW_OP_constu);
3777 Expr.push_back(DWARFAddressSpace.getValue());
3778 Expr.push_back(llvm::dwarf::DW_OP_swap);
3779 Expr.push_back(llvm::dwarf::DW_OP_xderef);
3782 void CGDebugInfo::EmitLexicalBlockStart(CGBuilderTy &Builder,
3783 SourceLocation Loc) {
3784 // Set our current location.
3787 // Emit a line table change for the current location inside the new scope.
3788 Builder.SetCurrentDebugLocation(
3789 llvm::DebugLoc::get(getLineNumber(Loc), getColumnNumber(Loc),
3790 LexicalBlockStack.back(), CurInlinedAt));
3792 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
3795 // Create a new lexical block and push it on the stack.
3796 CreateLexicalBlock(Loc);
3799 void CGDebugInfo::EmitLexicalBlockEnd(CGBuilderTy &Builder,
3800 SourceLocation Loc) {
3801 assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
3803 // Provide an entry in the line table for the end of the block.
3804 EmitLocation(Builder, Loc);
3806 if (DebugKind <= codegenoptions::DebugLineTablesOnly)
3809 LexicalBlockStack.pop_back();
3812 void CGDebugInfo::EmitFunctionEnd(CGBuilderTy &Builder, llvm::Function *Fn) {
3813 assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
3814 unsigned RCount = FnBeginRegionCount.back();
3815 assert(RCount <= LexicalBlockStack.size() && "Region stack mismatch");
3817 // Pop all regions for this function.
3818 while (LexicalBlockStack.size() != RCount) {
3819 // Provide an entry in the line table for the end of the block.
3820 EmitLocation(Builder, CurLoc);
3821 LexicalBlockStack.pop_back();
3823 FnBeginRegionCount.pop_back();
3825 if (Fn && Fn->getSubprogram())
3826 DBuilder.finalizeSubprogram(Fn->getSubprogram());
3829 CGDebugInfo::BlockByRefType
3830 CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
3831 uint64_t *XOffset) {
3832 SmallVector<llvm::Metadata *, 5> EltTys;
3834 uint64_t FieldSize, FieldOffset;
3835 uint32_t FieldAlign;
3837 llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
3838 QualType Type = VD->getType();
3841 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
3842 EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
3843 EltTys.push_back(CreateMemberType(Unit, FType, "__forwarding", &FieldOffset));
3844 FType = CGM.getContext().IntTy;
3845 EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
3846 EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));
3848 bool HasCopyAndDispose = CGM.getContext().BlockRequiresCopying(Type, VD);
3849 if (HasCopyAndDispose) {
3850 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
3852 CreateMemberType(Unit, FType, "__copy_helper", &FieldOffset));
3854 CreateMemberType(Unit, FType, "__destroy_helper", &FieldOffset));
3856 bool HasByrefExtendedLayout;
3857 Qualifiers::ObjCLifetime Lifetime;
3858 if (CGM.getContext().getByrefLifetime(Type, Lifetime,
3859 HasByrefExtendedLayout) &&
3860 HasByrefExtendedLayout) {
3861 FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
3863 CreateMemberType(Unit, FType, "__byref_variable_layout", &FieldOffset));
3866 CharUnits Align = CGM.getContext().getDeclAlign(VD);
3867 if (Align > CGM.getContext().toCharUnitsFromBits(
3868 CGM.getTarget().getPointerAlign(0))) {
3869 CharUnits FieldOffsetInBytes =
3870 CGM.getContext().toCharUnitsFromBits(FieldOffset);
3871 CharUnits AlignedOffsetInBytes = FieldOffsetInBytes.alignTo(Align);
3872 CharUnits NumPaddingBytes = AlignedOffsetInBytes - FieldOffsetInBytes;
3874 if (NumPaddingBytes.isPositive()) {
3875 llvm::APInt pad(32, NumPaddingBytes.getQuantity());
3876 FType = CGM.getContext().getConstantArrayType(
3877 CGM.getContext().CharTy, pad, nullptr, ArrayType::Normal, 0);
3878 EltTys.push_back(CreateMemberType(Unit, FType, "", &FieldOffset));
3883 llvm::DIType *WrappedTy = getOrCreateType(FType, Unit);
3884 FieldSize = CGM.getContext().getTypeSize(FType);
3885 FieldAlign = CGM.getContext().toBits(Align);
3887 *XOffset = FieldOffset;
3888 llvm::DIType *FieldTy = DBuilder.createMemberType(
3889 Unit, VD->getName(), Unit, 0, FieldSize, FieldAlign, FieldOffset,
3890 llvm::DINode::FlagZero, WrappedTy);
3891 EltTys.push_back(FieldTy);
3892 FieldOffset += FieldSize;
3894 llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
3895 return {DBuilder.createStructType(Unit, "", Unit, 0, FieldOffset, 0,
3896 llvm::DINode::FlagZero, nullptr, Elements),
3900 llvm::DILocalVariable *CGDebugInfo::EmitDeclare(const VarDecl *VD,
3901 llvm::Value *Storage,
3902 llvm::Optional<unsigned> ArgNo,
3903 CGBuilderTy &Builder,
3904 const bool UsePointerValue) {
3905 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
3906 assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
3907 if (VD->hasAttr<NoDebugAttr>())
3911 VD->isImplicit() || (isa<Decl>(VD->getDeclContext()) &&
3912 cast<Decl>(VD->getDeclContext())->isImplicit());
3913 llvm::DIFile *Unit = nullptr;
3915 Unit = getOrCreateFile(VD->getLocation());
3917 uint64_t XOffset = 0;
3918 if (VD->hasAttr<BlocksAttr>())
3919 Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset).WrappedType;
3921 Ty = getOrCreateType(VD->getType(), Unit);
3923 // If there is no debug info for this type then do not emit debug info
3924 // for this variable.
3928 // Get location information.
3930 unsigned Column = 0;
3932 Line = getLineNumber(VD->getLocation());
3933 Column = getColumnNumber(VD->getLocation());
3935 SmallVector<int64_t, 13> Expr;
3936 llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
3937 if (VD->isImplicit())
3938 Flags |= llvm::DINode::FlagArtificial;
3940 auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
3942 unsigned AddressSpace = CGM.getContext().getTargetAddressSpace(VD->getType());
3943 AppendAddressSpaceXDeref(AddressSpace, Expr);
3945 // If this is implicit parameter of CXXThis or ObjCSelf kind, then give it an
3946 // object pointer flag.
3947 if (const auto *IPD = dyn_cast<ImplicitParamDecl>(VD)) {
3948 if (IPD->getParameterKind() == ImplicitParamDecl::CXXThis ||
3949 IPD->getParameterKind() == ImplicitParamDecl::ObjCSelf)
3950 Flags |= llvm::DINode::FlagObjectPointer;
3953 // Note: Older versions of clang used to emit byval references with an extra
3954 // DW_OP_deref, because they referenced the IR arg directly instead of
3955 // referencing an alloca. Newer versions of LLVM don't treat allocas
3956 // differently from other function arguments when used in a dbg.declare.
3957 auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
3958 StringRef Name = VD->getName();
3959 if (!Name.empty()) {
3960 if (VD->hasAttr<BlocksAttr>()) {
3961 // Here, we need an offset *into* the alloca.
3962 CharUnits offset = CharUnits::fromQuantity(32);
3963 Expr.push_back(llvm::dwarf::DW_OP_plus_uconst);
3964 // offset of __forwarding field
3965 offset = CGM.getContext().toCharUnitsFromBits(
3966 CGM.getTarget().getPointerWidth(0));
3967 Expr.push_back(offset.getQuantity());
3968 Expr.push_back(llvm::dwarf::DW_OP_deref);
3969 Expr.push_back(llvm::dwarf::DW_OP_plus_uconst);
3970 // offset of x field
3971 offset = CGM.getContext().toCharUnitsFromBits(XOffset);
3972 Expr.push_back(offset.getQuantity());
3974 } else if (const auto *RT = dyn_cast<RecordType>(VD->getType())) {
3975 // If VD is an anonymous union then Storage represents value for
3976 // all union fields.
3977 const RecordDecl *RD = RT->getDecl();
3978 if (RD->isUnion() && RD->isAnonymousStructOrUnion()) {
3979 // GDB has trouble finding local variables in anonymous unions, so we emit
3980 // artificial local variables for each of the members.
3982 // FIXME: Remove this code as soon as GDB supports this.
3983 // The debug info verifier in LLVM operates based on the assumption that a
3984 // variable has the same size as its storage and we had to disable the
3985 // check for artificial variables.
3986 for (const auto *Field : RD->fields()) {
3987 llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
3988 StringRef FieldName = Field->getName();
3990 // Ignore unnamed fields. Do not ignore unnamed records.
3991 if (FieldName.empty() && !isa<RecordType>(Field->getType()))
3994 // Use VarDecl's Tag, Scope and Line number.
3995 auto FieldAlign = getDeclAlignIfRequired(Field, CGM.getContext());
3996 auto *D = DBuilder.createAutoVariable(
3997 Scope, FieldName, Unit, Line, FieldTy, CGM.getLangOpts().Optimize,
3998 Flags | llvm::DINode::FlagArtificial, FieldAlign);
4000 // Insert an llvm.dbg.declare into the current block.
4001 DBuilder.insertDeclare(
4002 Storage, D, DBuilder.createExpression(Expr),
4003 llvm::DebugLoc::get(Line, Column, Scope, CurInlinedAt),
4004 Builder.GetInsertBlock());
4009 // Clang stores the sret pointer provided by the caller in a static alloca.
4010 // Use DW_OP_deref to tell the debugger to load the pointer and treat it as
4011 // the address of the variable.
4012 if (UsePointerValue) {
4013 assert(std::find(Expr.begin(), Expr.end(), llvm::dwarf::DW_OP_deref) ==
4015 "Debug info already contains DW_OP_deref.");
4016 Expr.push_back(llvm::dwarf::DW_OP_deref);
4019 // Create the descriptor for the variable.
4020 auto *D = ArgNo ? DBuilder.createParameterVariable(
4021 Scope, Name, *ArgNo, Unit, Line, Ty,
4022 CGM.getLangOpts().Optimize, Flags)
4023 : DBuilder.createAutoVariable(Scope, Name, Unit, Line, Ty,
4024 CGM.getLangOpts().Optimize,
4027 // Insert an llvm.dbg.declare into the current block.
4028 DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
4029 llvm::DebugLoc::get(Line, Column, Scope, CurInlinedAt),
4030 Builder.GetInsertBlock());
4032 if (CGM.getCodeGenOpts().EnableDebugEntryValues && ArgNo) {
4033 if (auto *PD = dyn_cast<ParmVarDecl>(VD))
4034 ParamCache[PD].reset(D);
4040 llvm::DILocalVariable *
4041 CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD, llvm::Value *Storage,
4042 CGBuilderTy &Builder,
4043 const bool UsePointerValue) {
4044 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
4045 return EmitDeclare(VD, Storage, llvm::None, Builder, UsePointerValue);
4048 void CGDebugInfo::EmitLabel(const LabelDecl *D, CGBuilderTy &Builder) {
4049 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
4050 assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
4052 if (D->hasAttr<NoDebugAttr>())
4055 auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
4056 llvm::DIFile *Unit = getOrCreateFile(D->getLocation());
4058 // Get location information.
4059 unsigned Line = getLineNumber(D->getLocation());
4060 unsigned Column = getColumnNumber(D->getLocation());
4062 StringRef Name = D->getName();
4064 // Create the descriptor for the label.
4066 DBuilder.createLabel(Scope, Name, Unit, Line, CGM.getLangOpts().Optimize);
4068 // Insert an llvm.dbg.label into the current block.
4069 DBuilder.insertLabel(L,
4070 llvm::DebugLoc::get(Line, Column, Scope, CurInlinedAt),
4071 Builder.GetInsertBlock());
4074 llvm::DIType *CGDebugInfo::CreateSelfType(const QualType &QualTy,
4076 llvm::DIType *CachedTy = getTypeOrNull(QualTy);
4079 return DBuilder.createObjectPointerType(Ty);
4082 void CGDebugInfo::EmitDeclareOfBlockDeclRefVariable(
4083 const VarDecl *VD, llvm::Value *Storage, CGBuilderTy &Builder,
4084 const CGBlockInfo &blockInfo, llvm::Instruction *InsertPoint) {
4085 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
4086 assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
4088 if (Builder.GetInsertBlock() == nullptr)
4090 if (VD->hasAttr<NoDebugAttr>())
4093 bool isByRef = VD->hasAttr<BlocksAttr>();
4095 uint64_t XOffset = 0;
4096 llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
4099 Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset).WrappedType;
4101 Ty = getOrCreateType(VD->getType(), Unit);
4103 // Self is passed along as an implicit non-arg variable in a
4104 // block. Mark it as the object pointer.
4105 if (const auto *IPD = dyn_cast<ImplicitParamDecl>(VD))
4106 if (IPD->getParameterKind() == ImplicitParamDecl::ObjCSelf)
4107 Ty = CreateSelfType(VD->getType(), Ty);
4109 // Get location information.
4110 unsigned Line = getLineNumber(VD->getLocation());
4111 unsigned Column = getColumnNumber(VD->getLocation());
4113 const llvm::DataLayout &target = CGM.getDataLayout();
4115 CharUnits offset = CharUnits::fromQuantity(
4116 target.getStructLayout(blockInfo.StructureType)
4117 ->getElementOffset(blockInfo.getCapture(VD).getIndex()));
4119 SmallVector<int64_t, 9> addr;
4120 addr.push_back(llvm::dwarf::DW_OP_deref);
4121 addr.push_back(llvm::dwarf::DW_OP_plus_uconst);
4122 addr.push_back(offset.getQuantity());
4124 addr.push_back(llvm::dwarf::DW_OP_deref);
4125 addr.push_back(llvm::dwarf::DW_OP_plus_uconst);
4126 // offset of __forwarding field
4128 CGM.getContext().toCharUnitsFromBits(target.getPointerSizeInBits(0));
4129 addr.push_back(offset.getQuantity());
4130 addr.push_back(llvm::dwarf::DW_OP_deref);
4131 addr.push_back(llvm::dwarf::DW_OP_plus_uconst);
4132 // offset of x field
4133 offset = CGM.getContext().toCharUnitsFromBits(XOffset);
4134 addr.push_back(offset.getQuantity());
4137 // Create the descriptor for the variable.
4138 auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
4139 auto *D = DBuilder.createAutoVariable(
4140 cast<llvm::DILocalScope>(LexicalBlockStack.back()), VD->getName(), Unit,
4141 Line, Ty, false, llvm::DINode::FlagZero, Align);
4143 // Insert an llvm.dbg.declare into the current block.
4145 llvm::DebugLoc::get(Line, Column, LexicalBlockStack.back(), CurInlinedAt);
4146 auto *Expr = DBuilder.createExpression(addr);
4148 DBuilder.insertDeclare(Storage, D, Expr, DL, InsertPoint);
4150 DBuilder.insertDeclare(Storage, D, Expr, DL, Builder.GetInsertBlock());
4153 void CGDebugInfo::EmitDeclareOfArgVariable(const VarDecl *VD, llvm::Value *AI,
4155 CGBuilderTy &Builder) {
4156 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
4157 EmitDeclare(VD, AI, ArgNo, Builder);
4161 struct BlockLayoutChunk {
4162 uint64_t OffsetInBits;
4163 const BlockDecl::Capture *Capture;
4165 bool operator<(const BlockLayoutChunk &l, const BlockLayoutChunk &r) {
4166 return l.OffsetInBits < r.OffsetInBits;
4170 void CGDebugInfo::collectDefaultFieldsForBlockLiteralDeclare(
4171 const CGBlockInfo &Block, const ASTContext &Context, SourceLocation Loc,
4172 const llvm::StructLayout &BlockLayout, llvm::DIFile *Unit,
4173 SmallVectorImpl<llvm::Metadata *> &Fields) {
4174 // Blocks in OpenCL have unique constraints which make the standard fields
4175 // redundant while requiring size and align fields for enqueue_kernel. See
4176 // initializeForBlockHeader in CGBlocks.cpp
4177 if (CGM.getLangOpts().OpenCL) {
4178 Fields.push_back(createFieldType("__size", Context.IntTy, Loc, AS_public,
4179 BlockLayout.getElementOffsetInBits(0),
4181 Fields.push_back(createFieldType("__align", Context.IntTy, Loc, AS_public,
4182 BlockLayout.getElementOffsetInBits(1),
4185 Fields.push_back(createFieldType("__isa", Context.VoidPtrTy, Loc, AS_public,
4186 BlockLayout.getElementOffsetInBits(0),
4188 Fields.push_back(createFieldType("__flags", Context.IntTy, Loc, AS_public,
4189 BlockLayout.getElementOffsetInBits(1),
4192 createFieldType("__reserved", Context.IntTy, Loc, AS_public,
4193 BlockLayout.getElementOffsetInBits(2), Unit, Unit));
4194 auto *FnTy = Block.getBlockExpr()->getFunctionType();
4195 auto FnPtrType = CGM.getContext().getPointerType(FnTy->desugar());
4196 Fields.push_back(createFieldType("__FuncPtr", FnPtrType, Loc, AS_public,
4197 BlockLayout.getElementOffsetInBits(3),
4199 Fields.push_back(createFieldType(
4201 Context.getPointerType(Block.NeedsCopyDispose
4202 ? Context.getBlockDescriptorExtendedType()
4203 : Context.getBlockDescriptorType()),
4204 Loc, AS_public, BlockLayout.getElementOffsetInBits(4), Unit, Unit));
4208 void CGDebugInfo::EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
4211 llvm::AllocaInst *Alloca,
4212 CGBuilderTy &Builder) {
4213 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
4214 ASTContext &C = CGM.getContext();
4215 const BlockDecl *blockDecl = block.getBlockDecl();
4217 // Collect some general information about the block's location.
4218 SourceLocation loc = blockDecl->getCaretLocation();
4219 llvm::DIFile *tunit = getOrCreateFile(loc);
4220 unsigned line = getLineNumber(loc);
4221 unsigned column = getColumnNumber(loc);
4223 // Build the debug-info type for the block literal.
4224 getDeclContextDescriptor(blockDecl);
4226 const llvm::StructLayout *blockLayout =
4227 CGM.getDataLayout().getStructLayout(block.StructureType);
4229 SmallVector<llvm::Metadata *, 16> fields;
4230 collectDefaultFieldsForBlockLiteralDeclare(block, C, loc, *blockLayout, tunit,
4233 // We want to sort the captures by offset, not because DWARF
4234 // requires this, but because we're paranoid about debuggers.
4235 SmallVector<BlockLayoutChunk, 8> chunks;
4238 if (blockDecl->capturesCXXThis()) {
4239 BlockLayoutChunk chunk;
4240 chunk.OffsetInBits =
4241 blockLayout->getElementOffsetInBits(block.CXXThisIndex);
4242 chunk.Capture = nullptr;
4243 chunks.push_back(chunk);
4246 // Variable captures.
4247 for (const auto &capture : blockDecl->captures()) {
4248 const VarDecl *variable = capture.getVariable();
4249 const CGBlockInfo::Capture &captureInfo = block.getCapture(variable);
4251 // Ignore constant captures.
4252 if (captureInfo.isConstant())
4255 BlockLayoutChunk chunk;
4256 chunk.OffsetInBits =
4257 blockLayout->getElementOffsetInBits(captureInfo.getIndex());
4258 chunk.Capture = &capture;
4259 chunks.push_back(chunk);
4263 llvm::array_pod_sort(chunks.begin(), chunks.end());
4265 for (const BlockLayoutChunk &Chunk : chunks) {
4266 uint64_t offsetInBits = Chunk.OffsetInBits;
4267 const BlockDecl::Capture *capture = Chunk.Capture;
4269 // If we have a null capture, this must be the C++ 'this' capture.
4273 cast_or_null<CXXMethodDecl>(blockDecl->getNonClosureContext()))
4274 type = Method->getThisType();
4275 else if (auto *RDecl = dyn_cast<CXXRecordDecl>(blockDecl->getParent()))
4276 type = QualType(RDecl->getTypeForDecl(), 0);
4278 llvm_unreachable("unexpected block declcontext");
4280 fields.push_back(createFieldType("this", type, loc, AS_public,
4281 offsetInBits, tunit, tunit));
4285 const VarDecl *variable = capture->getVariable();
4286 StringRef name = variable->getName();
4288 llvm::DIType *fieldType;
4289 if (capture->isByRef()) {
4290 TypeInfo PtrInfo = C.getTypeInfo(C.VoidPtrTy);
4291 auto Align = PtrInfo.AlignIsRequired ? PtrInfo.Align : 0;
4292 // FIXME: This recomputes the layout of the BlockByRefWrapper.
4295 EmitTypeForVarWithBlocksAttr(variable, &xoffset).BlockByRefWrapper;
4296 fieldType = DBuilder.createPointerType(fieldType, PtrInfo.Width);
4297 fieldType = DBuilder.createMemberType(tunit, name, tunit, line,
4298 PtrInfo.Width, Align, offsetInBits,
4299 llvm::DINode::FlagZero, fieldType);
4301 auto Align = getDeclAlignIfRequired(variable, CGM.getContext());
4302 fieldType = createFieldType(name, variable->getType(), loc, AS_public,
4303 offsetInBits, Align, tunit, tunit);
4305 fields.push_back(fieldType);
4308 SmallString<36> typeName;
4309 llvm::raw_svector_ostream(typeName)
4310 << "__block_literal_" << CGM.getUniqueBlockCount();
4312 llvm::DINodeArray fieldsArray = DBuilder.getOrCreateArray(fields);
4314 llvm::DIType *type =
4315 DBuilder.createStructType(tunit, typeName.str(), tunit, line,
4316 CGM.getContext().toBits(block.BlockSize), 0,
4317 llvm::DINode::FlagZero, nullptr, fieldsArray);
4318 type = DBuilder.createPointerType(type, CGM.PointerWidthInBits);
4320 // Get overall information about the block.
4321 llvm::DINode::DIFlags flags = llvm::DINode::FlagArtificial;
4322 auto *scope = cast<llvm::DILocalScope>(LexicalBlockStack.back());
4324 // Create the descriptor for the parameter.
4325 auto *debugVar = DBuilder.createParameterVariable(
4326 scope, Name, ArgNo, tunit, line, type, CGM.getLangOpts().Optimize, flags);
4328 // Insert an llvm.dbg.declare into the current block.
4329 DBuilder.insertDeclare(Alloca, debugVar, DBuilder.createExpression(),
4330 llvm::DebugLoc::get(line, column, scope, CurInlinedAt),
4331 Builder.GetInsertBlock());
4334 llvm::DIDerivedType *
4335 CGDebugInfo::getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D) {
4336 if (!D || !D->isStaticDataMember())
4339 auto MI = StaticDataMemberCache.find(D->getCanonicalDecl());
4340 if (MI != StaticDataMemberCache.end()) {
4341 assert(MI->second && "Static data member declaration should still exist");
4345 // If the member wasn't found in the cache, lazily construct and add it to the
4346 // type (used when a limited form of the type is emitted).
4347 auto DC = D->getDeclContext();
4348 auto *Ctxt = cast<llvm::DICompositeType>(getDeclContextDescriptor(D));
4349 return CreateRecordStaticField(D, Ctxt, cast<RecordDecl>(DC));
4352 llvm::DIGlobalVariableExpression *CGDebugInfo::CollectAnonRecordDecls(
4353 const RecordDecl *RD, llvm::DIFile *Unit, unsigned LineNo,
4354 StringRef LinkageName, llvm::GlobalVariable *Var, llvm::DIScope *DContext) {
4355 llvm::DIGlobalVariableExpression *GVE = nullptr;
4357 for (const auto *Field : RD->fields()) {
4358 llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
4359 StringRef FieldName = Field->getName();
4361 // Ignore unnamed fields, but recurse into anonymous records.
4362 if (FieldName.empty()) {
4363 if (const auto *RT = dyn_cast<RecordType>(Field->getType()))
4364 GVE = CollectAnonRecordDecls(RT->getDecl(), Unit, LineNo, LinkageName,
4368 // Use VarDecl's Tag, Scope and Line number.
4369 GVE = DBuilder.createGlobalVariableExpression(
4370 DContext, FieldName, LinkageName, Unit, LineNo, FieldTy,
4371 Var->hasLocalLinkage());
4372 Var->addDebugInfo(GVE);
4377 void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
4379 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
4380 if (D->hasAttr<NoDebugAttr>())
4383 // If we already created a DIGlobalVariable for this declaration, just attach
4384 // it to the llvm::GlobalVariable.
4385 auto Cached = DeclCache.find(D->getCanonicalDecl());
4386 if (Cached != DeclCache.end())
4387 return Var->addDebugInfo(
4388 cast<llvm::DIGlobalVariableExpression>(Cached->second));
4390 // Create global variable debug descriptor.
4391 llvm::DIFile *Unit = nullptr;
4392 llvm::DIScope *DContext = nullptr;
4394 StringRef DeclName, LinkageName;
4396 llvm::MDTuple *TemplateParameters = nullptr;
4397 collectVarDeclProps(D, Unit, LineNo, T, DeclName, LinkageName,
4398 TemplateParameters, DContext);
4400 // Attempt to store one global variable for the declaration - even if we
4401 // emit a lot of fields.
4402 llvm::DIGlobalVariableExpression *GVE = nullptr;
4404 // If this is an anonymous union then we'll want to emit a global
4405 // variable for each member of the anonymous union so that it's possible
4406 // to find the name of any field in the union.
4407 if (T->isUnionType() && DeclName.empty()) {
4408 const RecordDecl *RD = T->castAs<RecordType>()->getDecl();
4409 assert(RD->isAnonymousStructOrUnion() &&
4410 "unnamed non-anonymous struct or union?");
4411 GVE = CollectAnonRecordDecls(RD, Unit, LineNo, LinkageName, Var, DContext);
4413 auto Align = getDeclAlignIfRequired(D, CGM.getContext());
4415 SmallVector<int64_t, 4> Expr;
4416 unsigned AddressSpace =
4417 CGM.getContext().getTargetAddressSpace(D->getType());
4418 if (CGM.getLangOpts().CUDA && CGM.getLangOpts().CUDAIsDevice) {
4419 if (D->hasAttr<CUDASharedAttr>())
4421 CGM.getContext().getTargetAddressSpace(LangAS::cuda_shared);
4422 else if (D->hasAttr<CUDAConstantAttr>())
4424 CGM.getContext().getTargetAddressSpace(LangAS::cuda_constant);
4426 AppendAddressSpaceXDeref(AddressSpace, Expr);
4428 GVE = DBuilder.createGlobalVariableExpression(
4429 DContext, DeclName, LinkageName, Unit, LineNo, getOrCreateType(T, Unit),
4430 Var->hasLocalLinkage(),
4431 Expr.empty() ? nullptr : DBuilder.createExpression(Expr),
4432 getOrCreateStaticDataMemberDeclarationOrNull(D), TemplateParameters,
4434 Var->addDebugInfo(GVE);
4436 DeclCache[D->getCanonicalDecl()].reset(GVE);
4439 void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD, const APValue &Init) {
4440 assert(DebugKind >= codegenoptions::LimitedDebugInfo);
4441 if (VD->hasAttr<NoDebugAttr>())
4443 auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
4444 // Create the descriptor for the variable.
4445 llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
4446 StringRef Name = VD->getName();
4447 llvm::DIType *Ty = getOrCreateType(VD->getType(), Unit);
4449 if (const auto *ECD = dyn_cast<EnumConstantDecl>(VD)) {
4450 const auto *ED = cast<EnumDecl>(ECD->getDeclContext());
4451 assert(isa<EnumType>(ED->getTypeForDecl()) && "Enum without EnumType?");
4453 if (CGM.getCodeGenOpts().EmitCodeView) {
4454 // If CodeView, emit enums as global variables, unless they are defined
4455 // inside a class. We do this because MSVC doesn't emit S_CONSTANTs for
4456 // enums in classes, and because it is difficult to attach this scope
4457 // information to the global variable.
4458 if (isa<RecordDecl>(ED->getDeclContext()))
4461 // If not CodeView, emit DW_TAG_enumeration_type if necessary. For
4462 // example: for "enum { ZERO };", a DW_TAG_enumeration_type is created the
4463 // first time `ZERO` is referenced in a function.
4464 llvm::DIType *EDTy =
4465 getOrCreateType(QualType(ED->getTypeForDecl(), 0), Unit);
4466 assert (EDTy->getTag() == llvm::dwarf::DW_TAG_enumeration_type);
4472 llvm::DIScope *DContext = nullptr;
4474 // Do not emit separate definitions for function local consts.
4475 if (isa<FunctionDecl>(VD->getDeclContext()))
4478 // Emit definition for static members in CodeView.
4479 VD = cast<ValueDecl>(VD->getCanonicalDecl());
4480 auto *VarD = dyn_cast<VarDecl>(VD);
4481 if (VarD && VarD->isStaticDataMember()) {
4482 auto *RD = cast<RecordDecl>(VarD->getDeclContext());
4483 getDeclContextDescriptor(VarD);
4484 // Ensure that the type is retained even though it's otherwise unreferenced.
4486 // FIXME: This is probably unnecessary, since Ty should reference RD
4487 // through its scope.
4488 RetainedTypes.push_back(
4489 CGM.getContext().getRecordType(RD).getAsOpaquePtr());
4491 if (!CGM.getCodeGenOpts().EmitCodeView)
4494 // Use the global scope for static members.
4495 DContext = getContextDescriptor(
4496 cast<Decl>(CGM.getContext().getTranslationUnitDecl()), TheCU);
4498 DContext = getDeclContextDescriptor(VD);
4501 auto &GV = DeclCache[VD];
4504 llvm::DIExpression *InitExpr = nullptr;
4505 if (CGM.getContext().getTypeSize(VD->getType()) <= 64) {
4506 // FIXME: Add a representation for integer constants wider than 64 bits.
4509 DBuilder.createConstantValueExpression(Init.getInt().getExtValue());
4510 else if (Init.isFloat())
4511 InitExpr = DBuilder.createConstantValueExpression(
4512 Init.getFloat().bitcastToAPInt().getZExtValue());
4515 llvm::MDTuple *TemplateParameters = nullptr;
4517 if (isa<VarTemplateSpecializationDecl>(VD))
4519 llvm::DINodeArray parameterNodes = CollectVarTemplateParams(VarD, &*Unit);
4520 TemplateParameters = parameterNodes.get();
4523 GV.reset(DBuilder.createGlobalVariableExpression(
4524 DContext, Name, StringRef(), Unit, getLineNumber(VD->getLocation()), Ty,
4525 true, InitExpr, getOrCreateStaticDataMemberDeclarationOrNull(VarD),
4526 TemplateParameters, Align));
4529 llvm::DIScope *CGDebugInfo::getCurrentContextDescriptor(const Decl *D) {
4530 if (!LexicalBlockStack.empty())
4531 return LexicalBlockStack.back();
4532 llvm::DIScope *Mod = getParentModuleOrNull(D);
4533 return getContextDescriptor(D, Mod ? Mod : TheCU);
4536 void CGDebugInfo::EmitUsingDirective(const UsingDirectiveDecl &UD) {
4537 if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
4539 const NamespaceDecl *NSDecl = UD.getNominatedNamespace();
4540 if (!NSDecl->isAnonymousNamespace() ||
4541 CGM.getCodeGenOpts().DebugExplicitImport) {
4542 auto Loc = UD.getLocation();
4543 DBuilder.createImportedModule(
4544 getCurrentContextDescriptor(cast<Decl>(UD.getDeclContext())),
4545 getOrCreateNamespace(NSDecl), getOrCreateFile(Loc), getLineNumber(Loc));
4549 void CGDebugInfo::EmitUsingDecl(const UsingDecl &UD) {
4550 if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
4552 assert(UD.shadow_size() &&
4553 "We shouldn't be codegening an invalid UsingDecl containing no decls");
4554 // Emitting one decl is sufficient - debuggers can detect that this is an
4555 // overloaded name & provide lookup for all the overloads.
4556 const UsingShadowDecl &USD = **UD.shadow_begin();
4558 // FIXME: Skip functions with undeduced auto return type for now since we
4559 // don't currently have the plumbing for separate declarations & definitions
4560 // of free functions and mismatched types (auto in the declaration, concrete
4561 // return type in the definition)
4562 if (const auto *FD = dyn_cast<FunctionDecl>(USD.getUnderlyingDecl()))
4563 if (const auto *AT =
4564 FD->getType()->castAs<FunctionProtoType>()->getContainedAutoType())
4565 if (AT->getDeducedType().isNull())
4567 if (llvm::DINode *Target =
4568 getDeclarationOrDefinition(USD.getUnderlyingDecl())) {
4569 auto Loc = USD.getLocation();
4570 DBuilder.createImportedDeclaration(
4571 getCurrentContextDescriptor(cast<Decl>(USD.getDeclContext())), Target,
4572 getOrCreateFile(Loc), getLineNumber(Loc));
4576 void CGDebugInfo::EmitImportDecl(const ImportDecl &ID) {
4577 if (CGM.getCodeGenOpts().getDebuggerTuning() != llvm::DebuggerKind::LLDB)
4579 if (Module *M = ID.getImportedModule()) {
4580 auto Info = ExternalASTSource::ASTSourceDescriptor(*M);
4581 auto Loc = ID.getLocation();
4582 DBuilder.createImportedDeclaration(
4583 getCurrentContextDescriptor(cast<Decl>(ID.getDeclContext())),
4584 getOrCreateModuleRef(Info, DebugTypeExtRefs), getOrCreateFile(Loc),
4585 getLineNumber(Loc));
4589 llvm::DIImportedEntity *
4590 CGDebugInfo::EmitNamespaceAlias(const NamespaceAliasDecl &NA) {
4591 if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
4593 auto &VH = NamespaceAliasCache[&NA];
4595 return cast<llvm::DIImportedEntity>(VH);
4596 llvm::DIImportedEntity *R;
4597 auto Loc = NA.getLocation();
4598 if (const auto *Underlying =
4599 dyn_cast<NamespaceAliasDecl>(NA.getAliasedNamespace()))
4600 // This could cache & dedup here rather than relying on metadata deduping.
4601 R = DBuilder.createImportedDeclaration(
4602 getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
4603 EmitNamespaceAlias(*Underlying), getOrCreateFile(Loc),
4604 getLineNumber(Loc), NA.getName());
4606 R = DBuilder.createImportedDeclaration(
4607 getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
4608 getOrCreateNamespace(cast<NamespaceDecl>(NA.getAliasedNamespace())),
4609 getOrCreateFile(Loc), getLineNumber(Loc), NA.getName());
4615 CGDebugInfo::getOrCreateNamespace(const NamespaceDecl *NSDecl) {
4616 // Don't canonicalize the NamespaceDecl here: The DINamespace will be uniqued
4617 // if necessary, and this way multiple declarations of the same namespace in
4618 // different parent modules stay distinct.
4619 auto I = NamespaceCache.find(NSDecl);
4620 if (I != NamespaceCache.end())
4621 return cast<llvm::DINamespace>(I->second);
4623 llvm::DIScope *Context = getDeclContextDescriptor(NSDecl);
4624 // Don't trust the context if it is a DIModule (see comment above).
4625 llvm::DINamespace *NS =
4626 DBuilder.createNameSpace(Context, NSDecl->getName(), NSDecl->isInline());
4627 NamespaceCache[NSDecl].reset(NS);
4631 void CGDebugInfo::setDwoId(uint64_t Signature) {
4632 assert(TheCU && "no main compile unit");
4633 TheCU->setDWOId(Signature);
4636 /// Analyzes each function parameter to determine whether it is constant
4637 /// throughout the function body.
4638 static void analyzeParametersModification(
4640 llvm::DenseMap<const FunctionDecl *, llvm::TrackingMDRef> &SPDefCache,
4641 llvm::DenseMap<const ParmVarDecl *, llvm::TrackingMDRef> &ParamCache) {
4642 for (auto &SP : SPDefCache) {
4643 auto *FD = SP.first;
4644 assert(FD->hasBody() && "Functions must have body here");
4645 const Stmt *FuncBody = (*FD).getBody();
4646 for (auto Parm : FD->parameters()) {
4647 ExprMutationAnalyzer FuncAnalyzer(*FuncBody, Ctx);
4648 if (FuncAnalyzer.isMutated(Parm))
4651 auto I = ParamCache.find(Parm);
4652 assert(I != ParamCache.end() && "Parameters should be already cached");
4653 auto *DIParm = cast<llvm::DILocalVariable>(I->second);
4654 DIParm->setIsNotModified();
4659 void CGDebugInfo::finalize() {
4660 // Creating types might create further types - invalidating the current
4661 // element and the size(), so don't cache/reference them.
4662 for (size_t i = 0; i != ObjCInterfaceCache.size(); ++i) {
4663 ObjCInterfaceCacheEntry E = ObjCInterfaceCache[i];
4664 llvm::DIType *Ty = E.Type->getDecl()->getDefinition()
4665 ? CreateTypeDefinition(E.Type, E.Unit)
4667 DBuilder.replaceTemporary(llvm::TempDIType(E.Decl), Ty);
4670 if (CGM.getCodeGenOpts().DwarfVersion >= 5) {
4671 // Add methods to interface.
4672 for (const auto &P : ObjCMethodCache) {
4673 if (P.second.empty())
4676 QualType QTy(P.first->getTypeForDecl(), 0);
4677 auto It = TypeCache.find(QTy.getAsOpaquePtr());
4678 assert(It != TypeCache.end());
4680 llvm::DICompositeType *InterfaceDecl =
4681 cast<llvm::DICompositeType>(It->second);
4683 SmallVector<llvm::Metadata *, 16> EltTys;
4684 auto CurrenetElts = InterfaceDecl->getElements();
4685 EltTys.append(CurrenetElts.begin(), CurrenetElts.end());
4686 for (auto &MD : P.second)
4687 EltTys.push_back(MD);
4688 llvm::DINodeArray Elements = DBuilder.getOrCreateArray(EltTys);
4689 DBuilder.replaceArrays(InterfaceDecl, Elements);
4693 for (const auto &P : ReplaceMap) {
4695 auto *Ty = cast<llvm::DIType>(P.second);
4696 assert(Ty->isForwardDecl());
4698 auto It = TypeCache.find(P.first);
4699 assert(It != TypeCache.end());
4702 DBuilder.replaceTemporary(llvm::TempDIType(Ty),
4703 cast<llvm::DIType>(It->second));
4706 for (const auto &P : FwdDeclReplaceMap) {
4708 llvm::TempMDNode FwdDecl(cast<llvm::MDNode>(P.second));
4709 llvm::Metadata *Repl;
4711 auto It = DeclCache.find(P.first);
4712 // If there has been no definition for the declaration, call RAUW
4713 // with ourselves, that will destroy the temporary MDNode and
4714 // replace it with a standard one, avoiding leaking memory.
4715 if (It == DeclCache.end())
4720 if (auto *GVE = dyn_cast_or_null<llvm::DIGlobalVariableExpression>(Repl))
4721 Repl = GVE->getVariable();
4722 DBuilder.replaceTemporary(std::move(FwdDecl), cast<llvm::MDNode>(Repl));
4725 // We keep our own list of retained types, because we need to look
4726 // up the final type in the type cache.
4727 for (auto &RT : RetainedTypes)
4728 if (auto MD = TypeCache[RT])
4729 DBuilder.retainType(cast<llvm::DIType>(MD));
4731 if (CGM.getCodeGenOpts().EnableDebugEntryValues)
4732 // This will be used to emit debug entry values.
4733 analyzeParametersModification(CGM.getContext(), SPDefCache, ParamCache);
4735 DBuilder.finalize();
4738 void CGDebugInfo::EmitExplicitCastType(QualType Ty) {
4739 if (CGM.getCodeGenOpts().getDebugInfo() < codegenoptions::LimitedDebugInfo)
4742 if (auto *DieTy = getOrCreateType(Ty, TheCU->getFile()))
4743 // Don't ignore in case of explicit cast where it is referenced indirectly.
4744 DBuilder.retainType(DieTy);
4747 llvm::DebugLoc CGDebugInfo::SourceLocToDebugLoc(SourceLocation Loc) {
4748 if (LexicalBlockStack.empty())
4749 return llvm::DebugLoc();
4751 llvm::MDNode *Scope = LexicalBlockStack.back();
4752 return llvm::DebugLoc::get(getLineNumber(Loc), getColumnNumber(Loc), Scope);
4755 llvm::DINode::DIFlags CGDebugInfo::getCallSiteRelatedAttrs() const {
4756 // Call site-related attributes are only useful in optimized programs, and
4757 // when there's a possibility of debugging backtraces.
4758 if (!CGM.getLangOpts().Optimize || DebugKind == codegenoptions::NoDebugInfo ||
4759 DebugKind == codegenoptions::LocTrackingOnly)
4760 return llvm::DINode::FlagZero;
4762 // Call site-related attributes are available in DWARF v5. Some debuggers,
4763 // while not fully DWARF v5-compliant, may accept these attributes as if they
4764 // were part of DWARF v4.
4765 bool SupportsDWARFv4Ext =
4766 CGM.getCodeGenOpts().DwarfVersion == 4 &&
4767 (CGM.getCodeGenOpts().getDebuggerTuning() == llvm::DebuggerKind::LLDB ||
4768 (CGM.getCodeGenOpts().EnableDebugEntryValues &&
4769 CGM.getCodeGenOpts().getDebuggerTuning() == llvm::DebuggerKind::GDB));
4771 if (!SupportsDWARFv4Ext && CGM.getCodeGenOpts().DwarfVersion < 5)
4772 return llvm::DINode::FlagZero;
4774 return llvm::DINode::FlagAllCallsDescribed;