1 //===----- CGCXXABI.h - Interface to C++ ABIs -------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This provides an abstract class for C++ code generation. Concrete subclasses 11 // of this implement code generation for specific C++ ABIs. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_CLANG_LIB_CODEGEN_CGCXXABI_H 16 #define LLVM_CLANG_LIB_CODEGEN_CGCXXABI_H 17 18 #include "CodeGenFunction.h" 19 #include "clang/Basic/LLVM.h" 20 21 namespace llvm { 22 class Constant; 23 class Type; 24 class Value; 25 class CallInst; 26 } 27 28 namespace clang { 29 class CastExpr; 30 class CXXConstructorDecl; 31 class CXXDestructorDecl; 32 class CXXMethodDecl; 33 class CXXRecordDecl; 34 class FieldDecl; 35 class MangleContext; 36 37 namespace CodeGen { 38 class CodeGenFunction; 39 class CodeGenModule; 40 struct CatchTypeInfo; 41 42 /// \brief Implements C++ ABI-specific code generation functions. 43 class CGCXXABI { 44 protected: 45 CodeGenModule &CGM; 46 std::unique_ptr<MangleContext> MangleCtx; 47 CGCXXABI(CodeGenModule & CGM)48 CGCXXABI(CodeGenModule &CGM) 49 : CGM(CGM), MangleCtx(CGM.getContext().createMangleContext()) {} 50 51 protected: getThisDecl(CodeGenFunction & CGF)52 ImplicitParamDecl *getThisDecl(CodeGenFunction &CGF) { 53 return CGF.CXXABIThisDecl; 54 } getThisValue(CodeGenFunction & CGF)55 llvm::Value *getThisValue(CodeGenFunction &CGF) { 56 return CGF.CXXABIThisValue; 57 } getThisAddress(CodeGenFunction & CGF)58 Address getThisAddress(CodeGenFunction &CGF) { 59 return Address(CGF.CXXABIThisValue, CGF.CXXABIThisAlignment); 60 } 61 62 /// Issue a diagnostic about unsupported features in the ABI. 63 void ErrorUnsupportedABI(CodeGenFunction &CGF, StringRef S); 64 65 /// Get a null value for unsupported member pointers. 66 llvm::Constant *GetBogusMemberPointer(QualType T); 67 getStructorImplicitParamDecl(CodeGenFunction & CGF)68 ImplicitParamDecl *&getStructorImplicitParamDecl(CodeGenFunction &CGF) { 69 return CGF.CXXStructorImplicitParamDecl; 70 } getStructorImplicitParamValue(CodeGenFunction & CGF)71 llvm::Value *&getStructorImplicitParamValue(CodeGenFunction &CGF) { 72 return CGF.CXXStructorImplicitParamValue; 73 } 74 75 /// Perform prolog initialization of the parameter variable suitable 76 /// for 'this' emitted by buildThisParam. 77 void EmitThisParam(CodeGenFunction &CGF); 78 getContext()79 ASTContext &getContext() const { return CGM.getContext(); } 80 81 virtual bool requiresArrayCookie(const CXXDeleteExpr *E, QualType eltType); 82 virtual bool requiresArrayCookie(const CXXNewExpr *E); 83 84 /// Determine whether there's something special about the rules of 85 /// the ABI tell us that 'this' is a complete object within the 86 /// given function. Obvious common logic like being defined on a 87 /// final class will have been taken care of by the caller. 88 virtual bool isThisCompleteObject(GlobalDecl GD) const = 0; 89 90 public: 91 92 virtual ~CGCXXABI(); 93 94 /// Gets the mangle context. getMangleContext()95 MangleContext &getMangleContext() { 96 return *MangleCtx; 97 } 98 99 /// Returns true if the given constructor or destructor is one of the 100 /// kinds that the ABI says returns 'this' (only applies when called 101 /// non-virtually for destructors). 102 /// 103 /// There currently is no way to indicate if a destructor returns 'this' 104 /// when called virtually, and code generation does not support the case. HasThisReturn(GlobalDecl GD)105 virtual bool HasThisReturn(GlobalDecl GD) const { return false; } 106 hasMostDerivedReturn(GlobalDecl GD)107 virtual bool hasMostDerivedReturn(GlobalDecl GD) const { return false; } 108 109 /// If the C++ ABI requires the given type be returned in a particular way, 110 /// this method sets RetAI and returns true. 111 virtual bool classifyReturnType(CGFunctionInfo &FI) const = 0; 112 113 /// Specify how one should pass an argument of a record type. 114 enum RecordArgABI { 115 /// Pass it using the normal C aggregate rules for the ABI, potentially 116 /// introducing extra copies and passing some or all of it in registers. 117 RAA_Default = 0, 118 119 /// Pass it on the stack using its defined layout. The argument must be 120 /// evaluated directly into the correct stack position in the arguments area, 121 /// and the call machinery must not move it or introduce extra copies. 122 RAA_DirectInMemory, 123 124 /// Pass it as a pointer to temporary memory. 125 RAA_Indirect 126 }; 127 128 /// Returns true if C++ allows us to copy the memory of an object of type RD 129 /// when it is passed as an argument. 130 bool canCopyArgument(const CXXRecordDecl *RD) const; 131 132 /// Returns how an argument of the given record type should be passed. 133 virtual RecordArgABI getRecordArgABI(const CXXRecordDecl *RD) const = 0; 134 135 /// Returns true if the implicit 'sret' parameter comes after the implicit 136 /// 'this' parameter of C++ instance methods. isSRetParameterAfterThis()137 virtual bool isSRetParameterAfterThis() const { return false; } 138 139 /// Find the LLVM type used to represent the given member pointer 140 /// type. 141 virtual llvm::Type * 142 ConvertMemberPointerType(const MemberPointerType *MPT); 143 144 /// Load a member function from an object and a member function 145 /// pointer. Apply the this-adjustment and set 'This' to the 146 /// adjusted value. 147 virtual llvm::Value *EmitLoadOfMemberFunctionPointer( 148 CodeGenFunction &CGF, const Expr *E, Address This, 149 llvm::Value *&ThisPtrForCall, llvm::Value *MemPtr, 150 const MemberPointerType *MPT); 151 152 /// Calculate an l-value from an object and a data member pointer. 153 virtual llvm::Value * 154 EmitMemberDataPointerAddress(CodeGenFunction &CGF, const Expr *E, 155 Address Base, llvm::Value *MemPtr, 156 const MemberPointerType *MPT); 157 158 /// Perform a derived-to-base, base-to-derived, or bitcast member 159 /// pointer conversion. 160 virtual llvm::Value *EmitMemberPointerConversion(CodeGenFunction &CGF, 161 const CastExpr *E, 162 llvm::Value *Src); 163 164 /// Perform a derived-to-base, base-to-derived, or bitcast member 165 /// pointer conversion on a constant value. 166 virtual llvm::Constant *EmitMemberPointerConversion(const CastExpr *E, 167 llvm::Constant *Src); 168 169 /// Return true if the given member pointer can be zero-initialized 170 /// (in the C++ sense) with an LLVM zeroinitializer. 171 virtual bool isZeroInitializable(const MemberPointerType *MPT); 172 173 /// Return whether or not a member pointers type is convertible to an IR type. isMemberPointerConvertible(const MemberPointerType * MPT)174 virtual bool isMemberPointerConvertible(const MemberPointerType *MPT) const { 175 return true; 176 } 177 178 /// Create a null member pointer of the given type. 179 virtual llvm::Constant *EmitNullMemberPointer(const MemberPointerType *MPT); 180 181 /// Create a member pointer for the given method. 182 virtual llvm::Constant *EmitMemberFunctionPointer(const CXXMethodDecl *MD); 183 184 /// Create a member pointer for the given field. 185 virtual llvm::Constant *EmitMemberDataPointer(const MemberPointerType *MPT, 186 CharUnits offset); 187 188 /// Create a member pointer for the given member pointer constant. 189 virtual llvm::Constant *EmitMemberPointer(const APValue &MP, QualType MPT); 190 191 /// Emit a comparison between two member pointers. Returns an i1. 192 virtual llvm::Value * 193 EmitMemberPointerComparison(CodeGenFunction &CGF, 194 llvm::Value *L, 195 llvm::Value *R, 196 const MemberPointerType *MPT, 197 bool Inequality); 198 199 /// Determine if a member pointer is non-null. Returns an i1. 200 virtual llvm::Value * 201 EmitMemberPointerIsNotNull(CodeGenFunction &CGF, 202 llvm::Value *MemPtr, 203 const MemberPointerType *MPT); 204 205 protected: 206 /// A utility method for computing the offset required for the given 207 /// base-to-derived or derived-to-base member-pointer conversion. 208 /// Does not handle virtual conversions (in case we ever fully 209 /// support an ABI that allows this). Returns null if no adjustment 210 /// is required. 211 llvm::Constant *getMemberPointerAdjustment(const CastExpr *E); 212 213 /// \brief Computes the non-virtual adjustment needed for a member pointer 214 /// conversion along an inheritance path stored in an APValue. Unlike 215 /// getMemberPointerAdjustment(), the adjustment can be negative if the path 216 /// is from a derived type to a base type. 217 CharUnits getMemberPointerPathAdjustment(const APValue &MP); 218 219 public: 220 virtual void emitVirtualObjectDelete(CodeGenFunction &CGF, 221 const CXXDeleteExpr *DE, 222 Address Ptr, QualType ElementType, 223 const CXXDestructorDecl *Dtor) = 0; 224 virtual void emitRethrow(CodeGenFunction &CGF, bool isNoReturn) = 0; 225 virtual void emitThrow(CodeGenFunction &CGF, const CXXThrowExpr *E) = 0; getThrowInfo(QualType T)226 virtual llvm::GlobalVariable *getThrowInfo(QualType T) { return nullptr; } 227 228 /// \brief Determine whether it's possible to emit a vtable for \p RD, even 229 /// though we do not know that the vtable has been marked as used by semantic 230 /// analysis. 231 virtual bool canSpeculativelyEmitVTable(const CXXRecordDecl *RD) const = 0; 232 233 virtual void emitBeginCatch(CodeGenFunction &CGF, const CXXCatchStmt *C) = 0; 234 235 virtual llvm::CallInst * 236 emitTerminateForUnexpectedException(CodeGenFunction &CGF, 237 llvm::Value *Exn); 238 239 virtual llvm::Constant *getAddrOfRTTIDescriptor(QualType Ty) = 0; 240 virtual CatchTypeInfo 241 getAddrOfCXXCatchHandlerType(QualType Ty, QualType CatchHandlerType) = 0; 242 virtual CatchTypeInfo getCatchAllTypeInfo(); 243 244 virtual bool shouldTypeidBeNullChecked(bool IsDeref, 245 QualType SrcRecordTy) = 0; 246 virtual void EmitBadTypeidCall(CodeGenFunction &CGF) = 0; 247 virtual llvm::Value *EmitTypeid(CodeGenFunction &CGF, QualType SrcRecordTy, 248 Address ThisPtr, 249 llvm::Type *StdTypeInfoPtrTy) = 0; 250 251 virtual bool shouldDynamicCastCallBeNullChecked(bool SrcIsPtr, 252 QualType SrcRecordTy) = 0; 253 254 virtual llvm::Value * 255 EmitDynamicCastCall(CodeGenFunction &CGF, Address Value, 256 QualType SrcRecordTy, QualType DestTy, 257 QualType DestRecordTy, llvm::BasicBlock *CastEnd) = 0; 258 259 virtual llvm::Value *EmitDynamicCastToVoid(CodeGenFunction &CGF, 260 Address Value, 261 QualType SrcRecordTy, 262 QualType DestTy) = 0; 263 264 virtual bool EmitBadCastCall(CodeGenFunction &CGF) = 0; 265 266 virtual llvm::Value *GetVirtualBaseClassOffset(CodeGenFunction &CGF, 267 Address This, 268 const CXXRecordDecl *ClassDecl, 269 const CXXRecordDecl *BaseClassDecl) = 0; 270 271 virtual llvm::BasicBlock *EmitCtorCompleteObjectHandler(CodeGenFunction &CGF, 272 const CXXRecordDecl *RD); 273 274 /// Emit the code to initialize hidden members required 275 /// to handle virtual inheritance, if needed by the ABI. 276 virtual void initializeHiddenVirtualInheritanceMembers(CodeGenFunction & CGF,const CXXRecordDecl * RD)277 initializeHiddenVirtualInheritanceMembers(CodeGenFunction &CGF, 278 const CXXRecordDecl *RD) {} 279 280 /// Emit constructor variants required by this ABI. 281 virtual void EmitCXXConstructors(const CXXConstructorDecl *D) = 0; 282 283 /// Build the signature of the given constructor or destructor variant by 284 /// adding any required parameters. For convenience, ArgTys has been 285 /// initialized with the type of 'this'. 286 virtual void buildStructorSignature(const CXXMethodDecl *MD, StructorType T, 287 SmallVectorImpl<CanQualType> &ArgTys) = 0; 288 289 /// Returns true if the given destructor type should be emitted as a linkonce 290 /// delegating thunk, regardless of whether the dtor is defined in this TU or 291 /// not. 292 virtual bool useThunkForDtorVariant(const CXXDestructorDecl *Dtor, 293 CXXDtorType DT) const = 0; 294 295 /// Emit destructor variants required by this ABI. 296 virtual void EmitCXXDestructors(const CXXDestructorDecl *D) = 0; 297 298 /// Get the type of the implicit "this" parameter used by a method. May return 299 /// zero if no specific type is applicable, e.g. if the ABI expects the "this" 300 /// parameter to point to some artificial offset in a complete object due to 301 /// vbases being reordered. 302 virtual const CXXRecordDecl * getThisArgumentTypeForMethod(const CXXMethodDecl * MD)303 getThisArgumentTypeForMethod(const CXXMethodDecl *MD) { 304 return MD->getParent(); 305 } 306 307 /// Perform ABI-specific "this" argument adjustment required prior to 308 /// a call of a virtual function. 309 /// The "VirtualCall" argument is true iff the call itself is virtual. 310 virtual Address adjustThisArgumentForVirtualFunctionCall(CodeGenFunction & CGF,GlobalDecl GD,Address This,bool VirtualCall)311 adjustThisArgumentForVirtualFunctionCall(CodeGenFunction &CGF, GlobalDecl GD, 312 Address This, bool VirtualCall) { 313 return This; 314 } 315 316 /// Build a parameter variable suitable for 'this'. 317 void buildThisParam(CodeGenFunction &CGF, FunctionArgList &Params); 318 319 /// Insert any ABI-specific implicit parameters into the parameter list for a 320 /// function. This generally involves extra data for constructors and 321 /// destructors. 322 /// 323 /// ABIs may also choose to override the return type, which has been 324 /// initialized with the type of 'this' if HasThisReturn(CGF.CurGD) is true or 325 /// the formal return type of the function otherwise. 326 virtual void addImplicitStructorParams(CodeGenFunction &CGF, QualType &ResTy, 327 FunctionArgList &Params) = 0; 328 329 /// Perform ABI-specific "this" parameter adjustment in a virtual function 330 /// prologue. adjustThisParameterInVirtualFunctionPrologue(CodeGenFunction & CGF,GlobalDecl GD,llvm::Value * This)331 virtual llvm::Value *adjustThisParameterInVirtualFunctionPrologue( 332 CodeGenFunction &CGF, GlobalDecl GD, llvm::Value *This) { 333 return This; 334 } 335 336 /// Emit the ABI-specific prolog for the function. 337 virtual void EmitInstanceFunctionProlog(CodeGenFunction &CGF) = 0; 338 339 /// Add any ABI-specific implicit arguments needed to call a constructor. 340 /// 341 /// \return The number of args added to the call, which is typically zero or 342 /// one. 343 virtual unsigned 344 addImplicitConstructorArgs(CodeGenFunction &CGF, const CXXConstructorDecl *D, 345 CXXCtorType Type, bool ForVirtualBase, 346 bool Delegating, CallArgList &Args) = 0; 347 348 /// Emit the destructor call. 349 virtual void EmitDestructorCall(CodeGenFunction &CGF, 350 const CXXDestructorDecl *DD, CXXDtorType Type, 351 bool ForVirtualBase, bool Delegating, 352 Address This) = 0; 353 354 /// Emits the VTable definitions required for the given record type. 355 virtual void emitVTableDefinitions(CodeGenVTables &CGVT, 356 const CXXRecordDecl *RD) = 0; 357 358 /// Checks if ABI requires extra virtual offset for vtable field. 359 virtual bool 360 isVirtualOffsetNeededForVTableField(CodeGenFunction &CGF, 361 CodeGenFunction::VPtr Vptr) = 0; 362 363 /// Checks if ABI requires to initilize vptrs for given dynamic class. 364 virtual bool doStructorsInitializeVPtrs(const CXXRecordDecl *VTableClass) = 0; 365 366 /// Get the address point of the vtable for the given base subobject. 367 virtual llvm::Constant * 368 getVTableAddressPoint(BaseSubobject Base, 369 const CXXRecordDecl *VTableClass) = 0; 370 371 /// Get the address point of the vtable for the given base subobject while 372 /// building a constructor or a destructor. 373 virtual llvm::Value * 374 getVTableAddressPointInStructor(CodeGenFunction &CGF, const CXXRecordDecl *RD, 375 BaseSubobject Base, 376 const CXXRecordDecl *NearestVBase) = 0; 377 378 /// Get the address point of the vtable for the given base subobject while 379 /// building a constexpr. 380 virtual llvm::Constant * 381 getVTableAddressPointForConstExpr(BaseSubobject Base, 382 const CXXRecordDecl *VTableClass) = 0; 383 384 /// Get the address of the vtable for the given record decl which should be 385 /// used for the vptr at the given offset in RD. 386 virtual llvm::GlobalVariable *getAddrOfVTable(const CXXRecordDecl *RD, 387 CharUnits VPtrOffset) = 0; 388 389 /// Build a virtual function pointer in the ABI-specific way. 390 virtual llvm::Value *getVirtualFunctionPointer(CodeGenFunction &CGF, 391 GlobalDecl GD, 392 Address This, 393 llvm::Type *Ty, 394 SourceLocation Loc) = 0; 395 396 /// Emit the ABI-specific virtual destructor call. 397 virtual llvm::Value * 398 EmitVirtualDestructorCall(CodeGenFunction &CGF, const CXXDestructorDecl *Dtor, 399 CXXDtorType DtorType, Address This, 400 const CXXMemberCallExpr *CE) = 0; 401 adjustCallArgsForDestructorThunk(CodeGenFunction & CGF,GlobalDecl GD,CallArgList & CallArgs)402 virtual void adjustCallArgsForDestructorThunk(CodeGenFunction &CGF, 403 GlobalDecl GD, 404 CallArgList &CallArgs) {} 405 406 /// Emit any tables needed to implement virtual inheritance. For Itanium, 407 /// this emits virtual table tables. For the MSVC++ ABI, this emits virtual 408 /// base tables. 409 virtual void emitVirtualInheritanceTables(const CXXRecordDecl *RD) = 0; 410 411 virtual void setThunkLinkage(llvm::Function *Thunk, bool ForVTable, 412 GlobalDecl GD, bool ReturnAdjustment) = 0; 413 414 virtual llvm::Value *performThisAdjustment(CodeGenFunction &CGF, 415 Address This, 416 const ThisAdjustment &TA) = 0; 417 418 virtual llvm::Value *performReturnAdjustment(CodeGenFunction &CGF, 419 Address Ret, 420 const ReturnAdjustment &RA) = 0; 421 422 virtual void EmitReturnFromThunk(CodeGenFunction &CGF, 423 RValue RV, QualType ResultType); 424 425 virtual size_t getSrcArgforCopyCtor(const CXXConstructorDecl *, 426 FunctionArgList &Args) const = 0; 427 428 /// Gets the offsets of all the virtual base pointers in a given class. 429 virtual std::vector<CharUnits> getVBPtrOffsets(const CXXRecordDecl *RD); 430 431 /// Gets the pure virtual member call function. 432 virtual StringRef GetPureVirtualCallName() = 0; 433 434 /// Gets the deleted virtual member call name. 435 virtual StringRef GetDeletedVirtualCallName() = 0; 436 437 /**************************** Array cookies ******************************/ 438 439 /// Returns the extra size required in order to store the array 440 /// cookie for the given new-expression. May return 0 to indicate that no 441 /// array cookie is required. 442 /// 443 /// Several cases are filtered out before this method is called: 444 /// - non-array allocations never need a cookie 445 /// - calls to \::operator new(size_t, void*) never need a cookie 446 /// 447 /// \param expr - the new-expression being allocated. 448 virtual CharUnits GetArrayCookieSize(const CXXNewExpr *expr); 449 450 /// Initialize the array cookie for the given allocation. 451 /// 452 /// \param NewPtr - a char* which is the presumed-non-null 453 /// return value of the allocation function 454 /// \param NumElements - the computed number of elements, 455 /// potentially collapsed from the multidimensional array case; 456 /// always a size_t 457 /// \param ElementType - the base element allocated type, 458 /// i.e. the allocated type after stripping all array types 459 virtual Address InitializeArrayCookie(CodeGenFunction &CGF, 460 Address NewPtr, 461 llvm::Value *NumElements, 462 const CXXNewExpr *expr, 463 QualType ElementType); 464 465 /// Reads the array cookie associated with the given pointer, 466 /// if it has one. 467 /// 468 /// \param Ptr - a pointer to the first element in the array 469 /// \param ElementType - the base element type of elements of the array 470 /// \param NumElements - an out parameter which will be initialized 471 /// with the number of elements allocated, or zero if there is no 472 /// cookie 473 /// \param AllocPtr - an out parameter which will be initialized 474 /// with a char* pointing to the address returned by the allocation 475 /// function 476 /// \param CookieSize - an out parameter which will be initialized 477 /// with the size of the cookie, or zero if there is no cookie 478 virtual void ReadArrayCookie(CodeGenFunction &CGF, Address Ptr, 479 const CXXDeleteExpr *expr, 480 QualType ElementType, llvm::Value *&NumElements, 481 llvm::Value *&AllocPtr, CharUnits &CookieSize); 482 483 /// Return whether the given global decl needs a VTT parameter. 484 virtual bool NeedsVTTParameter(GlobalDecl GD); 485 486 protected: 487 /// Returns the extra size required in order to store the array 488 /// cookie for the given type. Assumes that an array cookie is 489 /// required. 490 virtual CharUnits getArrayCookieSizeImpl(QualType elementType); 491 492 /// Reads the array cookie for an allocation which is known to have one. 493 /// This is called by the standard implementation of ReadArrayCookie. 494 /// 495 /// \param ptr - a pointer to the allocation made for an array, as a char* 496 /// \param cookieSize - the computed cookie size of an array 497 /// 498 /// Other parameters are as above. 499 /// 500 /// \return a size_t 501 virtual llvm::Value *readArrayCookieImpl(CodeGenFunction &IGF, Address ptr, 502 CharUnits cookieSize); 503 504 public: 505 506 /*************************** Static local guards ****************************/ 507 508 /// Emits the guarded initializer and destructor setup for the given 509 /// variable, given that it couldn't be emitted as a constant. 510 /// If \p PerformInit is false, the initialization has been folded to a 511 /// constant and should not be performed. 512 /// 513 /// The variable may be: 514 /// - a static local variable 515 /// - a static data member of a class template instantiation 516 virtual void EmitGuardedInit(CodeGenFunction &CGF, const VarDecl &D, 517 llvm::GlobalVariable *DeclPtr, 518 bool PerformInit) = 0; 519 520 /// Emit code to force the execution of a destructor during global 521 /// teardown. The default implementation of this uses atexit. 522 /// 523 /// \param Dtor - a function taking a single pointer argument 524 /// \param Addr - a pointer to pass to the destructor function. 525 virtual void registerGlobalDtor(CodeGenFunction &CGF, const VarDecl &D, 526 llvm::Constant *Dtor, 527 llvm::Constant *Addr) = 0; 528 529 /*************************** thread_local initialization ********************/ 530 531 /// Emits ABI-required functions necessary to initialize thread_local 532 /// variables in this translation unit. 533 /// 534 /// \param CXXThreadLocals - The thread_local declarations in this translation 535 /// unit. 536 /// \param CXXThreadLocalInits - If this translation unit contains any 537 /// non-constant initialization or non-trivial destruction for 538 /// thread_local variables, a list of functions to perform the 539 /// initialization. 540 virtual void EmitThreadLocalInitFuncs( 541 CodeGenModule &CGM, ArrayRef<const VarDecl *> CXXThreadLocals, 542 ArrayRef<llvm::Function *> CXXThreadLocalInits, 543 ArrayRef<const VarDecl *> CXXThreadLocalInitVars) = 0; 544 545 // Determine if references to thread_local global variables can be made 546 // directly or require access through a thread wrapper function. 547 virtual bool usesThreadWrapperFunction() const = 0; 548 549 /// Emit a reference to a non-local thread_local variable (including 550 /// triggering the initialization of all thread_local variables in its 551 /// translation unit). 552 virtual LValue EmitThreadLocalVarDeclLValue(CodeGenFunction &CGF, 553 const VarDecl *VD, 554 QualType LValType) = 0; 555 556 /// Emit a single constructor/destructor with the given type from a C++ 557 /// constructor Decl. 558 virtual void emitCXXStructor(const CXXMethodDecl *MD, StructorType Type) = 0; 559 }; 560 561 // Create an instance of a C++ ABI class: 562 563 /// Creates an Itanium-family ABI. 564 CGCXXABI *CreateItaniumCXXABI(CodeGenModule &CGM); 565 566 /// Creates a Microsoft-family ABI. 567 CGCXXABI *CreateMicrosoftCXXABI(CodeGenModule &CGM); 568 569 } 570 } 571 572 #endif 573