1 //===--- CGDebugInfo.h - DebugInfo for LLVM CodeGen -------------*- C++ -*-===// 2 // 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 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This is the source-level debug info generator for llvm translation. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H 14 #define LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H 15 16 #include "CGBuilder.h" 17 #include "clang/AST/DeclCXX.h" 18 #include "clang/AST/Expr.h" 19 #include "clang/AST/ExternalASTSource.h" 20 #include "clang/AST/PrettyPrinter.h" 21 #include "clang/AST/Type.h" 22 #include "clang/AST/TypeOrdering.h" 23 #include "clang/Basic/CodeGenOptions.h" 24 #include "clang/Basic/Module.h" 25 #include "clang/Basic/SourceLocation.h" 26 #include "llvm/ADT/DenseMap.h" 27 #include "llvm/ADT/DenseSet.h" 28 #include "llvm/IR/DIBuilder.h" 29 #include "llvm/IR/DebugInfo.h" 30 #include "llvm/IR/ValueHandle.h" 31 #include "llvm/Support/Allocator.h" 32 #include <optional> 33 34 namespace llvm { 35 class MDNode; 36 } 37 38 namespace clang { 39 class ClassTemplateSpecializationDecl; 40 class GlobalDecl; 41 class ModuleMap; 42 class ObjCInterfaceDecl; 43 class UsingDecl; 44 class VarDecl; 45 enum class DynamicInitKind : unsigned; 46 47 namespace CodeGen { 48 class CodeGenModule; 49 class CodeGenFunction; 50 class CGBlockInfo; 51 52 /// This class gathers all debug information during compilation and is 53 /// responsible for emitting to llvm globals or pass directly to the 54 /// backend. 55 class CGDebugInfo { 56 friend class ApplyDebugLocation; 57 friend class SaveAndRestoreLocation; 58 CodeGenModule &CGM; 59 const llvm::codegenoptions::DebugInfoKind DebugKind; 60 bool DebugTypeExtRefs; 61 llvm::DIBuilder DBuilder; 62 llvm::DICompileUnit *TheCU = nullptr; 63 ModuleMap *ClangModuleMap = nullptr; 64 ASTSourceDescriptor PCHDescriptor; 65 SourceLocation CurLoc; 66 llvm::MDNode *CurInlinedAt = nullptr; 67 llvm::DIType *VTablePtrType = nullptr; 68 llvm::DIType *ClassTy = nullptr; 69 llvm::DICompositeType *ObjTy = nullptr; 70 llvm::DIType *SelTy = nullptr; 71 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \ 72 llvm::DIType *SingletonId = nullptr; 73 #include "clang/Basic/OpenCLImageTypes.def" 74 llvm::DIType *OCLSamplerDITy = nullptr; 75 llvm::DIType *OCLEventDITy = nullptr; 76 llvm::DIType *OCLClkEventDITy = nullptr; 77 llvm::DIType *OCLQueueDITy = nullptr; 78 llvm::DIType *OCLNDRangeDITy = nullptr; 79 llvm::DIType *OCLReserveIDDITy = nullptr; 80 #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \ 81 llvm::DIType *Id##Ty = nullptr; 82 #include "clang/Basic/OpenCLExtensionTypes.def" 83 #define WASM_TYPE(Name, Id, SingletonId) llvm::DIType *SingletonId = nullptr; 84 #include "clang/Basic/WebAssemblyReferenceTypes.def" 85 86 /// Cache of previously constructed Types. 87 llvm::DenseMap<const void *, llvm::TrackingMDRef> TypeCache; 88 89 /// Cache that maps VLA types to size expressions for that type, 90 /// represented by instantiated Metadata nodes. 91 llvm::SmallDenseMap<QualType, llvm::Metadata *> SizeExprCache; 92 93 /// Callbacks to use when printing names and types. 94 class PrintingCallbacks final : public clang::PrintingCallbacks { 95 const CGDebugInfo &Self; 96 97 public: 98 PrintingCallbacks(const CGDebugInfo &Self) : Self(Self) {} 99 std::string remapPath(StringRef Path) const override { 100 return Self.remapDIPath(Path); 101 } 102 }; 103 PrintingCallbacks PrintCB = {*this}; 104 105 struct ObjCInterfaceCacheEntry { 106 const ObjCInterfaceType *Type; 107 llvm::DIType *Decl; 108 llvm::DIFile *Unit; 109 ObjCInterfaceCacheEntry(const ObjCInterfaceType *Type, llvm::DIType *Decl, 110 llvm::DIFile *Unit) 111 : Type(Type), Decl(Decl), Unit(Unit) {} 112 }; 113 114 /// Cache of previously constructed interfaces which may change. 115 llvm::SmallVector<ObjCInterfaceCacheEntry, 32> ObjCInterfaceCache; 116 117 /// Cache of forward declarations for methods belonging to the interface. 118 /// The extra bit on the DISubprogram specifies whether a method is 119 /// "objc_direct". 120 llvm::DenseMap<const ObjCInterfaceDecl *, 121 std::vector<llvm::PointerIntPair<llvm::DISubprogram *, 1>>> 122 ObjCMethodCache; 123 124 /// Cache of references to clang modules and precompiled headers. 125 llvm::DenseMap<const Module *, llvm::TrackingMDRef> ModuleCache; 126 127 /// List of interfaces we want to keep even if orphaned. 128 std::vector<void *> RetainedTypes; 129 130 /// Cache of forward declared types to RAUW at the end of compilation. 131 std::vector<std::pair<const TagType *, llvm::TrackingMDRef>> ReplaceMap; 132 133 /// Cache of replaceable forward declarations (functions and 134 /// variables) to RAUW at the end of compilation. 135 std::vector<std::pair<const DeclaratorDecl *, llvm::TrackingMDRef>> 136 FwdDeclReplaceMap; 137 138 /// Keep track of our current nested lexical block. 139 std::vector<llvm::TypedTrackingMDRef<llvm::DIScope>> LexicalBlockStack; 140 llvm::DenseMap<const Decl *, llvm::TrackingMDRef> RegionMap; 141 /// Keep track of LexicalBlockStack counter at the beginning of a 142 /// function. This is used to pop unbalanced regions at the end of a 143 /// function. 144 std::vector<unsigned> FnBeginRegionCount; 145 146 /// This is a storage for names that are constructed on demand. For 147 /// example, C++ destructors, C++ operators etc.. 148 llvm::BumpPtrAllocator DebugInfoNames; 149 StringRef CWDName; 150 151 llvm::DenseMap<const char *, llvm::TrackingMDRef> DIFileCache; 152 llvm::DenseMap<const FunctionDecl *, llvm::TrackingMDRef> SPCache; 153 /// Cache declarations relevant to DW_TAG_imported_declarations (C++ 154 /// using declarations and global alias variables) that aren't covered 155 /// by other more specific caches. 156 llvm::DenseMap<const Decl *, llvm::TrackingMDRef> DeclCache; 157 llvm::DenseMap<const Decl *, llvm::TrackingMDRef> ImportedDeclCache; 158 llvm::DenseMap<const NamespaceDecl *, llvm::TrackingMDRef> NamespaceCache; 159 llvm::DenseMap<const NamespaceAliasDecl *, llvm::TrackingMDRef> 160 NamespaceAliasCache; 161 llvm::DenseMap<const Decl *, llvm::TypedTrackingMDRef<llvm::DIDerivedType>> 162 StaticDataMemberCache; 163 164 using ParamDecl2StmtTy = llvm::DenseMap<const ParmVarDecl *, const Stmt *>; 165 using Param2DILocTy = 166 llvm::DenseMap<const ParmVarDecl *, llvm::DILocalVariable *>; 167 168 /// The key is coroutine real parameters, value is coroutine move parameters. 169 ParamDecl2StmtTy CoroutineParameterMappings; 170 /// The key is coroutine real parameters, value is DIVariable in LLVM IR. 171 Param2DILocTy ParamDbgMappings; 172 173 /// Helper functions for getOrCreateType. 174 /// @{ 175 /// Currently the checksum of an interface includes the number of 176 /// ivars and property accessors. 177 llvm::DIType *CreateType(const BuiltinType *Ty); 178 llvm::DIType *CreateType(const ComplexType *Ty); 179 llvm::DIType *CreateType(const BitIntType *Ty); 180 llvm::DIType *CreateQualifiedType(QualType Ty, llvm::DIFile *Fg); 181 llvm::DIType *CreateQualifiedType(const FunctionProtoType *Ty, 182 llvm::DIFile *Fg); 183 llvm::DIType *CreateType(const TypedefType *Ty, llvm::DIFile *Fg); 184 llvm::DIType *CreateType(const TemplateSpecializationType *Ty, 185 llvm::DIFile *Fg); 186 llvm::DIType *CreateType(const ObjCObjectPointerType *Ty, llvm::DIFile *F); 187 llvm::DIType *CreateType(const PointerType *Ty, llvm::DIFile *F); 188 llvm::DIType *CreateType(const BlockPointerType *Ty, llvm::DIFile *F); 189 llvm::DIType *CreateType(const FunctionType *Ty, llvm::DIFile *F); 190 /// Get structure or union type. 191 llvm::DIType *CreateType(const RecordType *Tyg); 192 193 /// Create definition for the specified 'Ty'. 194 /// 195 /// \returns A pair of 'llvm::DIType's. The first is the definition 196 /// of the 'Ty'. The second is the type specified by the preferred_name 197 /// attribute on 'Ty', which can be a nullptr if no such attribute 198 /// exists. 199 std::pair<llvm::DIType *, llvm::DIType *> 200 CreateTypeDefinition(const RecordType *Ty); 201 llvm::DICompositeType *CreateLimitedType(const RecordType *Ty); 202 void CollectContainingType(const CXXRecordDecl *RD, 203 llvm::DICompositeType *CT); 204 /// Get Objective-C interface type. 205 llvm::DIType *CreateType(const ObjCInterfaceType *Ty, llvm::DIFile *F); 206 llvm::DIType *CreateTypeDefinition(const ObjCInterfaceType *Ty, 207 llvm::DIFile *F); 208 /// Get Objective-C object type. 209 llvm::DIType *CreateType(const ObjCObjectType *Ty, llvm::DIFile *F); 210 llvm::DIType *CreateType(const ObjCTypeParamType *Ty, llvm::DIFile *Unit); 211 212 llvm::DIType *CreateType(const VectorType *Ty, llvm::DIFile *F); 213 llvm::DIType *CreateType(const ConstantMatrixType *Ty, llvm::DIFile *F); 214 llvm::DIType *CreateType(const ArrayType *Ty, llvm::DIFile *F); 215 llvm::DIType *CreateType(const LValueReferenceType *Ty, llvm::DIFile *F); 216 llvm::DIType *CreateType(const RValueReferenceType *Ty, llvm::DIFile *Unit); 217 llvm::DIType *CreateType(const MemberPointerType *Ty, llvm::DIFile *F); 218 llvm::DIType *CreateType(const AtomicType *Ty, llvm::DIFile *F); 219 llvm::DIType *CreateType(const PipeType *Ty, llvm::DIFile *F); 220 /// Get enumeration type. 221 llvm::DIType *CreateEnumType(const EnumType *Ty); 222 llvm::DIType *CreateTypeDefinition(const EnumType *Ty); 223 /// Look up the completed type for a self pointer in the TypeCache and 224 /// create a copy of it with the ObjectPointer and Artificial flags 225 /// set. If the type is not cached, a new one is created. This should 226 /// never happen though, since creating a type for the implicit self 227 /// argument implies that we already parsed the interface definition 228 /// and the ivar declarations in the implementation. 229 llvm::DIType *CreateSelfType(const QualType &QualTy, llvm::DIType *Ty); 230 /// @} 231 232 /// Get the type from the cache or return null type if it doesn't 233 /// exist. 234 llvm::DIType *getTypeOrNull(const QualType); 235 /// Return the debug type for a C++ method. 236 /// \arg CXXMethodDecl is of FunctionType. This function type is 237 /// not updated to include implicit \c this pointer. Use this routine 238 /// to get a method type which includes \c this pointer. 239 llvm::DISubroutineType *getOrCreateMethodType(const CXXMethodDecl *Method, 240 llvm::DIFile *F); 241 llvm::DISubroutineType * 242 getOrCreateInstanceMethodType(QualType ThisPtr, const FunctionProtoType *Func, 243 llvm::DIFile *Unit); 244 llvm::DISubroutineType * 245 getOrCreateFunctionType(const Decl *D, QualType FnType, llvm::DIFile *F); 246 /// \return debug info descriptor for vtable. 247 llvm::DIType *getOrCreateVTablePtrType(llvm::DIFile *F); 248 249 /// \return namespace descriptor for the given namespace decl. 250 llvm::DINamespace *getOrCreateNamespace(const NamespaceDecl *N); 251 llvm::DIType *CreatePointerLikeType(llvm::dwarf::Tag Tag, const Type *Ty, 252 QualType PointeeTy, llvm::DIFile *F); 253 llvm::DIType *getOrCreateStructPtrType(StringRef Name, llvm::DIType *&Cache); 254 255 /// A helper function to create a subprogram for a single member 256 /// function GlobalDecl. 257 llvm::DISubprogram *CreateCXXMemberFunction(const CXXMethodDecl *Method, 258 llvm::DIFile *F, 259 llvm::DIType *RecordTy); 260 261 /// A helper function to collect debug info for C++ member 262 /// functions. This is used while creating debug info entry for a 263 /// Record. 264 void CollectCXXMemberFunctions(const CXXRecordDecl *Decl, llvm::DIFile *F, 265 SmallVectorImpl<llvm::Metadata *> &E, 266 llvm::DIType *T); 267 268 /// A helper function to collect debug info for C++ base 269 /// classes. This is used while creating debug info entry for a 270 /// Record. 271 void CollectCXXBases(const CXXRecordDecl *Decl, llvm::DIFile *F, 272 SmallVectorImpl<llvm::Metadata *> &EltTys, 273 llvm::DIType *RecordTy); 274 275 /// Helper function for CollectCXXBases. 276 /// Adds debug info entries for types in Bases that are not in SeenTypes. 277 void CollectCXXBasesAux( 278 const CXXRecordDecl *RD, llvm::DIFile *Unit, 279 SmallVectorImpl<llvm::Metadata *> &EltTys, llvm::DIType *RecordTy, 280 const CXXRecordDecl::base_class_const_range &Bases, 281 llvm::DenseSet<CanonicalDeclPtr<const CXXRecordDecl>> &SeenTypes, 282 llvm::DINode::DIFlags StartingFlags); 283 284 /// Helper function that returns the llvm::DIType that the 285 /// PreferredNameAttr attribute on \ref RD refers to. If no such 286 /// attribute exists, returns nullptr. 287 llvm::DIType *GetPreferredNameType(const CXXRecordDecl *RD, 288 llvm::DIFile *Unit); 289 290 struct TemplateArgs { 291 const TemplateParameterList *TList; 292 llvm::ArrayRef<TemplateArgument> Args; 293 }; 294 /// A helper function to collect template parameters. 295 llvm::DINodeArray CollectTemplateParams(std::optional<TemplateArgs> Args, 296 llvm::DIFile *Unit); 297 /// A helper function to collect debug info for function template 298 /// parameters. 299 llvm::DINodeArray CollectFunctionTemplateParams(const FunctionDecl *FD, 300 llvm::DIFile *Unit); 301 302 /// A helper function to collect debug info for function template 303 /// parameters. 304 llvm::DINodeArray CollectVarTemplateParams(const VarDecl *VD, 305 llvm::DIFile *Unit); 306 307 std::optional<TemplateArgs> GetTemplateArgs(const VarDecl *) const; 308 std::optional<TemplateArgs> GetTemplateArgs(const RecordDecl *) const; 309 std::optional<TemplateArgs> GetTemplateArgs(const FunctionDecl *) const; 310 311 /// A helper function to collect debug info for template 312 /// parameters. 313 llvm::DINodeArray CollectCXXTemplateParams(const RecordDecl *TS, 314 llvm::DIFile *F); 315 316 /// A helper function to collect debug info for btf_decl_tag annotations. 317 llvm::DINodeArray CollectBTFDeclTagAnnotations(const Decl *D); 318 319 llvm::DIType *createFieldType(StringRef name, QualType type, 320 SourceLocation loc, AccessSpecifier AS, 321 uint64_t offsetInBits, uint32_t AlignInBits, 322 llvm::DIFile *tunit, llvm::DIScope *scope, 323 const RecordDecl *RD = nullptr, 324 llvm::DINodeArray Annotations = nullptr); 325 326 llvm::DIType *createFieldType(StringRef name, QualType type, 327 SourceLocation loc, AccessSpecifier AS, 328 uint64_t offsetInBits, llvm::DIFile *tunit, 329 llvm::DIScope *scope, 330 const RecordDecl *RD = nullptr) { 331 return createFieldType(name, type, loc, AS, offsetInBits, 0, tunit, scope, 332 RD); 333 } 334 335 /// Create new bit field member. 336 llvm::DIDerivedType *createBitFieldType(const FieldDecl *BitFieldDecl, 337 llvm::DIScope *RecordTy, 338 const RecordDecl *RD); 339 340 /// Create type for binding declarations. 341 llvm::DIType *CreateBindingDeclType(const BindingDecl *BD); 342 343 /// Create an anonnymous zero-size separator for bit-field-decl if needed on 344 /// the target. 345 llvm::DIDerivedType *createBitFieldSeparatorIfNeeded( 346 const FieldDecl *BitFieldDecl, const llvm::DIDerivedType *BitFieldDI, 347 llvm::ArrayRef<llvm::Metadata *> PreviousFieldsDI, const RecordDecl *RD); 348 349 /// Helpers for collecting fields of a record. 350 /// @{ 351 void CollectRecordLambdaFields(const CXXRecordDecl *CXXDecl, 352 SmallVectorImpl<llvm::Metadata *> &E, 353 llvm::DIType *RecordTy); 354 llvm::DIDerivedType *CreateRecordStaticField(const VarDecl *Var, 355 llvm::DIType *RecordTy, 356 const RecordDecl *RD); 357 void CollectRecordNormalField(const FieldDecl *Field, uint64_t OffsetInBits, 358 llvm::DIFile *F, 359 SmallVectorImpl<llvm::Metadata *> &E, 360 llvm::DIType *RecordTy, const RecordDecl *RD); 361 void CollectRecordNestedType(const TypeDecl *RD, 362 SmallVectorImpl<llvm::Metadata *> &E); 363 void CollectRecordFields(const RecordDecl *Decl, llvm::DIFile *F, 364 SmallVectorImpl<llvm::Metadata *> &E, 365 llvm::DICompositeType *RecordTy); 366 367 /// If the C++ class has vtable info then insert appropriate debug 368 /// info entry in EltTys vector. 369 void CollectVTableInfo(const CXXRecordDecl *Decl, llvm::DIFile *F, 370 SmallVectorImpl<llvm::Metadata *> &EltTys); 371 /// @} 372 373 /// Create a new lexical block node and push it on the stack. 374 void CreateLexicalBlock(SourceLocation Loc); 375 376 /// If target-specific LLVM \p AddressSpace directly maps to target-specific 377 /// DWARF address space, appends extended dereferencing mechanism to complex 378 /// expression \p Expr. Otherwise, does nothing. 379 /// 380 /// Extended dereferencing mechanism is has the following format: 381 /// DW_OP_constu <DWARF Address Space> DW_OP_swap DW_OP_xderef 382 void AppendAddressSpaceXDeref(unsigned AddressSpace, 383 SmallVectorImpl<uint64_t> &Expr) const; 384 385 /// A helper function to collect debug info for the default elements of a 386 /// block. 387 /// 388 /// \returns The next available field offset after the default elements. 389 uint64_t collectDefaultElementTypesForBlockPointer( 390 const BlockPointerType *Ty, llvm::DIFile *Unit, 391 llvm::DIDerivedType *DescTy, unsigned LineNo, 392 SmallVectorImpl<llvm::Metadata *> &EltTys); 393 394 /// A helper function to collect debug info for the default fields of a 395 /// block. 396 void collectDefaultFieldsForBlockLiteralDeclare( 397 const CGBlockInfo &Block, const ASTContext &Context, SourceLocation Loc, 398 const llvm::StructLayout &BlockLayout, llvm::DIFile *Unit, 399 SmallVectorImpl<llvm::Metadata *> &Fields); 400 401 public: 402 CGDebugInfo(CodeGenModule &CGM); 403 ~CGDebugInfo(); 404 405 void finalize(); 406 407 /// Remap a given path with the current debug prefix map 408 std::string remapDIPath(StringRef) const; 409 410 /// Register VLA size expression debug node with the qualified type. 411 void registerVLASizeExpression(QualType Ty, llvm::Metadata *SizeExpr) { 412 SizeExprCache[Ty] = SizeExpr; 413 } 414 415 /// Module debugging: Support for building PCMs. 416 /// @{ 417 /// Set the main CU's DwoId field to \p Signature. 418 void setDwoId(uint64_t Signature); 419 420 /// When generating debug information for a clang module or 421 /// precompiled header, this module map will be used to determine 422 /// the module of origin of each Decl. 423 void setModuleMap(ModuleMap &MMap) { ClangModuleMap = &MMap; } 424 425 /// When generating debug information for a clang module or 426 /// precompiled header, this module map will be used to determine 427 /// the module of origin of each Decl. 428 void setPCHDescriptor(ASTSourceDescriptor PCH) { PCHDescriptor = PCH; } 429 /// @} 430 431 /// Update the current source location. If \arg loc is invalid it is 432 /// ignored. 433 void setLocation(SourceLocation Loc); 434 435 /// Return the current source location. This does not necessarily correspond 436 /// to the IRBuilder's current DebugLoc. 437 SourceLocation getLocation() const { return CurLoc; } 438 439 /// Update the current inline scope. All subsequent calls to \p EmitLocation 440 /// will create a location with this inlinedAt field. 441 void setInlinedAt(llvm::MDNode *InlinedAt) { CurInlinedAt = InlinedAt; } 442 443 /// \return the current inline scope. 444 llvm::MDNode *getInlinedAt() const { return CurInlinedAt; } 445 446 // Converts a SourceLocation to a DebugLoc 447 llvm::DebugLoc SourceLocToDebugLoc(SourceLocation Loc); 448 449 /// Emit metadata to indicate a change in line/column information in 450 /// the source file. If the location is invalid, the previous 451 /// location will be reused. 452 void EmitLocation(CGBuilderTy &Builder, SourceLocation Loc); 453 454 QualType getFunctionType(const FunctionDecl *FD, QualType RetTy, 455 const SmallVectorImpl<const VarDecl *> &Args); 456 457 /// Emit a call to llvm.dbg.function.start to indicate 458 /// start of a new function. 459 /// \param Loc The location of the function header. 460 /// \param ScopeLoc The location of the function body. 461 void emitFunctionStart(GlobalDecl GD, SourceLocation Loc, 462 SourceLocation ScopeLoc, QualType FnType, 463 llvm::Function *Fn, bool CurFnIsThunk); 464 465 /// Start a new scope for an inlined function. 466 void EmitInlineFunctionStart(CGBuilderTy &Builder, GlobalDecl GD); 467 /// End an inlined function scope. 468 void EmitInlineFunctionEnd(CGBuilderTy &Builder); 469 470 /// Emit debug info for a function declaration. 471 /// \p Fn is set only when a declaration for a debug call site gets created. 472 void EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc, 473 QualType FnType, llvm::Function *Fn = nullptr); 474 475 /// Emit debug info for an extern function being called. 476 /// This is needed for call site debug info. 477 void EmitFuncDeclForCallSite(llvm::CallBase *CallOrInvoke, 478 QualType CalleeType, 479 const FunctionDecl *CalleeDecl); 480 481 /// Constructs the debug code for exiting a function. 482 void EmitFunctionEnd(CGBuilderTy &Builder, llvm::Function *Fn); 483 484 /// Emit metadata to indicate the beginning of a new lexical block 485 /// and push the block onto the stack. 486 void EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc); 487 488 /// Emit metadata to indicate the end of a new lexical block and pop 489 /// the current block. 490 void EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc); 491 492 /// Emit call to \c llvm.dbg.declare for an automatic variable 493 /// declaration. 494 /// Returns a pointer to the DILocalVariable associated with the 495 /// llvm.dbg.declare, or nullptr otherwise. 496 llvm::DILocalVariable * 497 EmitDeclareOfAutoVariable(const VarDecl *Decl, llvm::Value *AI, 498 CGBuilderTy &Builder, 499 const bool UsePointerValue = false); 500 501 /// Emit call to \c llvm.dbg.label for an label. 502 void EmitLabel(const LabelDecl *D, CGBuilderTy &Builder); 503 504 /// Emit call to \c llvm.dbg.declare for an imported variable 505 /// declaration in a block. 506 void EmitDeclareOfBlockDeclRefVariable( 507 const VarDecl *variable, llvm::Value *storage, CGBuilderTy &Builder, 508 const CGBlockInfo &blockInfo, llvm::Instruction *InsertPoint = nullptr); 509 510 /// Emit call to \c llvm.dbg.declare for an argument variable 511 /// declaration. 512 llvm::DILocalVariable * 513 EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI, unsigned ArgNo, 514 CGBuilderTy &Builder, bool UsePointerValue = false); 515 516 /// Emit call to \c llvm.dbg.declare for the block-literal argument 517 /// to a block invocation function. 518 void EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block, 519 StringRef Name, unsigned ArgNo, 520 llvm::AllocaInst *LocalAddr, 521 CGBuilderTy &Builder); 522 523 /// Emit information about a global variable. 524 void EmitGlobalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl); 525 526 /// Emit a constant global variable's debug info. 527 void EmitGlobalVariable(const ValueDecl *VD, const APValue &Init); 528 529 /// Emit information about an external variable. 530 void EmitExternalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl); 531 532 /// Emit information about global variable alias. 533 void EmitGlobalAlias(const llvm::GlobalValue *GV, const GlobalDecl Decl); 534 535 /// Emit C++ using directive. 536 void EmitUsingDirective(const UsingDirectiveDecl &UD); 537 538 /// Emit the type explicitly casted to. 539 void EmitExplicitCastType(QualType Ty); 540 541 /// Emit the type even if it might not be used. 542 void EmitAndRetainType(QualType Ty); 543 544 /// Emit a shadow decl brought in by a using or using-enum 545 void EmitUsingShadowDecl(const UsingShadowDecl &USD); 546 547 /// Emit C++ using declaration. 548 void EmitUsingDecl(const UsingDecl &UD); 549 550 /// Emit C++ using-enum declaration. 551 void EmitUsingEnumDecl(const UsingEnumDecl &UD); 552 553 /// Emit an @import declaration. 554 void EmitImportDecl(const ImportDecl &ID); 555 556 /// DebugInfo isn't attached to string literals by default. While certain 557 /// aspects of debuginfo aren't useful for string literals (like a name), it's 558 /// nice to be able to symbolize the line and column information. This is 559 /// especially useful for sanitizers, as it allows symbolization of 560 /// heap-buffer-overflows on constant strings. 561 void AddStringLiteralDebugInfo(llvm::GlobalVariable *GV, 562 const StringLiteral *S); 563 564 /// Emit C++ namespace alias. 565 llvm::DIImportedEntity *EmitNamespaceAlias(const NamespaceAliasDecl &NA); 566 567 /// Emit record type's standalone debug info. 568 llvm::DIType *getOrCreateRecordType(QualType Ty, SourceLocation L); 569 570 /// Emit an Objective-C interface type standalone debug info. 571 llvm::DIType *getOrCreateInterfaceType(QualType Ty, SourceLocation Loc); 572 573 /// Emit standalone debug info for a type. 574 llvm::DIType *getOrCreateStandaloneType(QualType Ty, SourceLocation Loc); 575 576 /// Add heapallocsite metadata for MSAllocator calls. 577 void addHeapAllocSiteMetadata(llvm::CallBase *CallSite, QualType AllocatedTy, 578 SourceLocation Loc); 579 580 void completeType(const EnumDecl *ED); 581 void completeType(const RecordDecl *RD); 582 void completeRequiredType(const RecordDecl *RD); 583 void completeClassData(const RecordDecl *RD); 584 void completeClass(const RecordDecl *RD); 585 586 void completeTemplateDefinition(const ClassTemplateSpecializationDecl &SD); 587 void completeUnusedClass(const CXXRecordDecl &D); 588 589 /// Create debug info for a macro defined by a #define directive or a macro 590 /// undefined by a #undef directive. 591 llvm::DIMacro *CreateMacro(llvm::DIMacroFile *Parent, unsigned MType, 592 SourceLocation LineLoc, StringRef Name, 593 StringRef Value); 594 595 /// Create debug info for a file referenced by an #include directive. 596 llvm::DIMacroFile *CreateTempMacroFile(llvm::DIMacroFile *Parent, 597 SourceLocation LineLoc, 598 SourceLocation FileLoc); 599 600 Param2DILocTy &getParamDbgMappings() { return ParamDbgMappings; } 601 ParamDecl2StmtTy &getCoroutineParameterMappings() { 602 return CoroutineParameterMappings; 603 } 604 605 private: 606 /// Emit call to llvm.dbg.declare for a variable declaration. 607 /// Returns a pointer to the DILocalVariable associated with the 608 /// llvm.dbg.declare, or nullptr otherwise. 609 llvm::DILocalVariable *EmitDeclare(const VarDecl *decl, llvm::Value *AI, 610 std::optional<unsigned> ArgNo, 611 CGBuilderTy &Builder, 612 const bool UsePointerValue = false); 613 614 /// Emit call to llvm.dbg.declare for a binding declaration. 615 /// Returns a pointer to the DILocalVariable associated with the 616 /// llvm.dbg.declare, or nullptr otherwise. 617 llvm::DILocalVariable *EmitDeclare(const BindingDecl *decl, llvm::Value *AI, 618 std::optional<unsigned> ArgNo, 619 CGBuilderTy &Builder, 620 const bool UsePointerValue = false); 621 622 struct BlockByRefType { 623 /// The wrapper struct used inside the __block_literal struct. 624 llvm::DIType *BlockByRefWrapper; 625 /// The type as it appears in the source code. 626 llvm::DIType *WrappedType; 627 }; 628 629 std::string GetName(const Decl*, bool Qualified = false) const; 630 631 /// Build up structure info for the byref. See \a BuildByRefType. 632 BlockByRefType EmitTypeForVarWithBlocksAttr(const VarDecl *VD, 633 uint64_t *OffSet); 634 635 /// Get context info for the DeclContext of \p Decl. 636 llvm::DIScope *getDeclContextDescriptor(const Decl *D); 637 /// Get context info for a given DeclContext \p Decl. 638 llvm::DIScope *getContextDescriptor(const Decl *Context, 639 llvm::DIScope *Default); 640 641 llvm::DIScope *getCurrentContextDescriptor(const Decl *Decl); 642 643 /// Create a forward decl for a RecordType in a given context. 644 llvm::DICompositeType *getOrCreateRecordFwdDecl(const RecordType *, 645 llvm::DIScope *); 646 647 /// Return current directory name. 648 StringRef getCurrentDirname(); 649 650 /// Create new compile unit. 651 void CreateCompileUnit(); 652 653 /// Compute the file checksum debug info for input file ID. 654 std::optional<llvm::DIFile::ChecksumKind> 655 computeChecksum(FileID FID, SmallString<64> &Checksum) const; 656 657 /// Get the source of the given file ID. 658 std::optional<StringRef> getSource(const SourceManager &SM, FileID FID); 659 660 /// Convenience function to get the file debug info descriptor for the input 661 /// location. 662 llvm::DIFile *getOrCreateFile(SourceLocation Loc); 663 664 /// Create a file debug info descriptor for a source file. 665 llvm::DIFile * 666 createFile(StringRef FileName, 667 std::optional<llvm::DIFile::ChecksumInfo<StringRef>> CSInfo, 668 std::optional<StringRef> Source); 669 670 /// Get the type from the cache or create a new type if necessary. 671 llvm::DIType *getOrCreateType(QualType Ty, llvm::DIFile *Fg); 672 673 /// Get a reference to a clang module. If \p CreateSkeletonCU is true, 674 /// this also creates a split dwarf skeleton compile unit. 675 llvm::DIModule *getOrCreateModuleRef(ASTSourceDescriptor Mod, 676 bool CreateSkeletonCU); 677 678 /// DebugTypeExtRefs: If \p D originated in a clang module, return it. 679 llvm::DIModule *getParentModuleOrNull(const Decl *D); 680 681 /// Get the type from the cache or create a new partial type if 682 /// necessary. 683 llvm::DICompositeType *getOrCreateLimitedType(const RecordType *Ty); 684 685 /// Create type metadata for a source language type. 686 llvm::DIType *CreateTypeNode(QualType Ty, llvm::DIFile *Fg); 687 688 /// Create new member and increase Offset by FType's size. 689 llvm::DIType *CreateMemberType(llvm::DIFile *Unit, QualType FType, 690 StringRef Name, uint64_t *Offset); 691 692 /// Retrieve the DIDescriptor, if any, for the canonical form of this 693 /// declaration. 694 llvm::DINode *getDeclarationOrDefinition(const Decl *D); 695 696 /// \return debug info descriptor to describe method 697 /// declaration for the given method definition. 698 llvm::DISubprogram *getFunctionDeclaration(const Decl *D); 699 700 /// \return debug info descriptor to the describe method declaration 701 /// for the given method definition. 702 /// \param FnType For Objective-C methods, their type. 703 /// \param LineNo The declaration's line number. 704 /// \param Flags The DIFlags for the method declaration. 705 /// \param SPFlags The subprogram-spcific flags for the method declaration. 706 llvm::DISubprogram * 707 getObjCMethodDeclaration(const Decl *D, llvm::DISubroutineType *FnType, 708 unsigned LineNo, llvm::DINode::DIFlags Flags, 709 llvm::DISubprogram::DISPFlags SPFlags); 710 711 /// \return debug info descriptor to describe in-class static data 712 /// member declaration for the given out-of-class definition. If D 713 /// is an out-of-class definition of a static data member of a 714 /// class, find its corresponding in-class declaration. 715 llvm::DIDerivedType * 716 getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D); 717 718 /// Helper that either creates a forward declaration or a stub. 719 llvm::DISubprogram *getFunctionFwdDeclOrStub(GlobalDecl GD, bool Stub); 720 721 /// Create a subprogram describing the forward declaration 722 /// represented in the given FunctionDecl wrapped in a GlobalDecl. 723 llvm::DISubprogram *getFunctionForwardDeclaration(GlobalDecl GD); 724 725 /// Create a DISubprogram describing the function 726 /// represented in the given FunctionDecl wrapped in a GlobalDecl. 727 llvm::DISubprogram *getFunctionStub(GlobalDecl GD); 728 729 /// Create a global variable describing the forward declaration 730 /// represented in the given VarDecl. 731 llvm::DIGlobalVariable * 732 getGlobalVariableForwardDeclaration(const VarDecl *VD); 733 734 /// Return a global variable that represents one of the collection of global 735 /// variables created for an anonmyous union. 736 /// 737 /// Recursively collect all of the member fields of a global 738 /// anonymous decl and create static variables for them. The first 739 /// time this is called it needs to be on a union and then from 740 /// there we can have additional unnamed fields. 741 llvm::DIGlobalVariableExpression * 742 CollectAnonRecordDecls(const RecordDecl *RD, llvm::DIFile *Unit, 743 unsigned LineNo, StringRef LinkageName, 744 llvm::GlobalVariable *Var, llvm::DIScope *DContext); 745 746 747 /// Return flags which enable debug info emission for call sites, provided 748 /// that it is supported and enabled. 749 llvm::DINode::DIFlags getCallSiteRelatedAttrs() const; 750 751 /// Get the printing policy for producing names for debug info. 752 PrintingPolicy getPrintingPolicy() const; 753 754 /// Get function name for the given FunctionDecl. If the name is 755 /// constructed on demand (e.g., C++ destructor) then the name is 756 /// stored on the side. 757 StringRef getFunctionName(const FunctionDecl *FD); 758 759 /// Returns the unmangled name of an Objective-C method. 760 /// This is the display name for the debugging info. 761 StringRef getObjCMethodName(const ObjCMethodDecl *FD); 762 763 /// Return selector name. This is used for debugging 764 /// info. 765 StringRef getSelectorName(Selector S); 766 767 /// Get class name including template argument list. 768 StringRef getClassName(const RecordDecl *RD); 769 770 /// Get the vtable name for the given class. 771 StringRef getVTableName(const CXXRecordDecl *Decl); 772 773 /// Get the name to use in the debug info for a dynamic initializer or atexit 774 /// stub function. 775 StringRef getDynamicInitializerName(const VarDecl *VD, 776 DynamicInitKind StubKind, 777 llvm::Function *InitFn); 778 779 /// Get line number for the location. If location is invalid 780 /// then use current location. 781 unsigned getLineNumber(SourceLocation Loc); 782 783 /// Get column number for the location. If location is 784 /// invalid then use current location. 785 /// \param Force Assume DebugColumnInfo option is true. 786 unsigned getColumnNumber(SourceLocation Loc, bool Force = false); 787 788 /// Collect various properties of a FunctionDecl. 789 /// \param GD A GlobalDecl whose getDecl() must return a FunctionDecl. 790 void collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit, 791 StringRef &Name, StringRef &LinkageName, 792 llvm::DIScope *&FDContext, 793 llvm::DINodeArray &TParamsArray, 794 llvm::DINode::DIFlags &Flags); 795 796 /// Collect various properties of a VarDecl. 797 void collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit, 798 unsigned &LineNo, QualType &T, StringRef &Name, 799 StringRef &LinkageName, 800 llvm::MDTuple *&TemplateParameters, 801 llvm::DIScope *&VDContext); 802 803 /// Create a DIExpression representing the constant corresponding 804 /// to the specified 'Val'. Returns nullptr on failure. 805 llvm::DIExpression *createConstantValueExpression(const clang::ValueDecl *VD, 806 const APValue &Val); 807 808 /// Allocate a copy of \p A using the DebugInfoNames allocator 809 /// and return a reference to it. If multiple arguments are given the strings 810 /// are concatenated. 811 StringRef internString(StringRef A, StringRef B = StringRef()) { 812 char *Data = DebugInfoNames.Allocate<char>(A.size() + B.size()); 813 if (!A.empty()) 814 std::memcpy(Data, A.data(), A.size()); 815 if (!B.empty()) 816 std::memcpy(Data + A.size(), B.data(), B.size()); 817 return StringRef(Data, A.size() + B.size()); 818 } 819 }; 820 821 /// A scoped helper to set the current debug location to the specified 822 /// location or preferred location of the specified Expr. 823 class ApplyDebugLocation { 824 private: 825 void init(SourceLocation TemporaryLocation, bool DefaultToEmpty = false); 826 ApplyDebugLocation(CodeGenFunction &CGF, bool DefaultToEmpty, 827 SourceLocation TemporaryLocation); 828 829 llvm::DebugLoc OriginalLocation; 830 CodeGenFunction *CGF; 831 832 public: 833 /// Set the location to the (valid) TemporaryLocation. 834 ApplyDebugLocation(CodeGenFunction &CGF, SourceLocation TemporaryLocation); 835 ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E); 836 ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc); 837 ApplyDebugLocation(ApplyDebugLocation &&Other) : CGF(Other.CGF) { 838 Other.CGF = nullptr; 839 } 840 841 // Define copy assignment operator. 842 ApplyDebugLocation &operator=(ApplyDebugLocation &&Other) { 843 if (this != &Other) { 844 CGF = Other.CGF; 845 Other.CGF = nullptr; 846 } 847 return *this; 848 } 849 850 ~ApplyDebugLocation(); 851 852 /// Apply TemporaryLocation if it is valid. Otherwise switch 853 /// to an artificial debug location that has a valid scope, but no 854 /// line information. 855 /// 856 /// Artificial locations are useful when emitting compiler-generated 857 /// helper functions that have no source location associated with 858 /// them. The DWARF specification allows the compiler to use the 859 /// special line number 0 to indicate code that can not be 860 /// attributed to any source location. Note that passing an empty 861 /// SourceLocation to CGDebugInfo::setLocation() will result in the 862 /// last valid location being reused. 863 static ApplyDebugLocation CreateArtificial(CodeGenFunction &CGF) { 864 return ApplyDebugLocation(CGF, false, SourceLocation()); 865 } 866 /// Apply TemporaryLocation if it is valid. Otherwise switch 867 /// to an artificial debug location that has a valid scope, but no 868 /// line information. 869 static ApplyDebugLocation 870 CreateDefaultArtificial(CodeGenFunction &CGF, 871 SourceLocation TemporaryLocation) { 872 return ApplyDebugLocation(CGF, false, TemporaryLocation); 873 } 874 875 /// Set the IRBuilder to not attach debug locations. Note that 876 /// passing an empty SourceLocation to \a CGDebugInfo::setLocation() 877 /// will result in the last valid location being reused. Note that 878 /// all instructions that do not have a location at the beginning of 879 /// a function are counted towards to function prologue. 880 static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF) { 881 return ApplyDebugLocation(CGF, true, SourceLocation()); 882 } 883 }; 884 885 /// A scoped helper to set the current debug location to an inlined location. 886 class ApplyInlineDebugLocation { 887 SourceLocation SavedLocation; 888 CodeGenFunction *CGF; 889 890 public: 891 /// Set up the CodeGenFunction's DebugInfo to produce inline locations for the 892 /// function \p InlinedFn. The current debug location becomes the inlined call 893 /// site of the inlined function. 894 ApplyInlineDebugLocation(CodeGenFunction &CGF, GlobalDecl InlinedFn); 895 /// Restore everything back to the original state. 896 ~ApplyInlineDebugLocation(); 897 }; 898 899 } // namespace CodeGen 900 } // namespace clang 901 902 #endif // LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H 903