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 48 CGCXXABI(CodeGenModule &CGM) 49 : CGM(CGM), MangleCtx(CGM.getContext().createMangleContext()) {} 50 51 protected: 52 ImplicitParamDecl *getThisDecl(CodeGenFunction &CGF) { 53 return CGF.CXXABIThisDecl; 54 } 55 llvm::Value *getThisValue(CodeGenFunction &CGF) { 56 return CGF.CXXABIThisValue; 57 } 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 68 ImplicitParamDecl *&getStructorImplicitParamDecl(CodeGenFunction &CGF) { 69 return CGF.CXXStructorImplicitParamDecl; 70 } 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 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. 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. 105 virtual bool HasThisReturn(GlobalDecl GD) const { return false; } 106 107 virtual bool hasMostDerivedReturn(GlobalDecl GD) const { return false; } 108 109 /// Returns true if the target allows calling a function through a pointer 110 /// with a different signature than the actual function (or equivalently, 111 /// bitcasting a function or function pointer to a different function type). 112 /// In principle in the most general case this could depend on the target, the 113 /// calling convention, and the actual types of the arguments and return 114 /// value. Here it just means whether the signature mismatch could *ever* be 115 /// allowed; in other words, does the target do strict checking of signatures 116 /// for all calls. 117 virtual bool canCallMismatchedFunctionType() const { return true; } 118 119 /// If the C++ ABI requires the given type be returned in a particular way, 120 /// this method sets RetAI and returns true. 121 virtual bool classifyReturnType(CGFunctionInfo &FI) const = 0; 122 123 /// Specify how one should pass an argument of a record type. 124 enum RecordArgABI { 125 /// Pass it using the normal C aggregate rules for the ABI, potentially 126 /// introducing extra copies and passing some or all of it in registers. 127 RAA_Default = 0, 128 129 /// Pass it on the stack using its defined layout. The argument must be 130 /// evaluated directly into the correct stack position in the arguments area, 131 /// and the call machinery must not move it or introduce extra copies. 132 RAA_DirectInMemory, 133 134 /// Pass it as a pointer to temporary memory. 135 RAA_Indirect 136 }; 137 138 /// Returns true if C++ allows us to copy the memory of an object of type RD 139 /// when it is passed as an argument. 140 bool canCopyArgument(const CXXRecordDecl *RD) const; 141 142 /// Returns how an argument of the given record type should be passed. 143 virtual RecordArgABI getRecordArgABI(const CXXRecordDecl *RD) const = 0; 144 145 /// Returns true if the implicit 'sret' parameter comes after the implicit 146 /// 'this' parameter of C++ instance methods. 147 virtual bool isSRetParameterAfterThis() const { return false; } 148 149 /// Find the LLVM type used to represent the given member pointer 150 /// type. 151 virtual llvm::Type * 152 ConvertMemberPointerType(const MemberPointerType *MPT); 153 154 /// Load a member function from an object and a member function 155 /// pointer. Apply the this-adjustment and set 'This' to the 156 /// adjusted value. 157 virtual llvm::Value *EmitLoadOfMemberFunctionPointer( 158 CodeGenFunction &CGF, const Expr *E, Address This, 159 llvm::Value *&ThisPtrForCall, llvm::Value *MemPtr, 160 const MemberPointerType *MPT); 161 162 /// Calculate an l-value from an object and a data member pointer. 163 virtual llvm::Value * 164 EmitMemberDataPointerAddress(CodeGenFunction &CGF, const Expr *E, 165 Address Base, llvm::Value *MemPtr, 166 const MemberPointerType *MPT); 167 168 /// Perform a derived-to-base, base-to-derived, or bitcast member 169 /// pointer conversion. 170 virtual llvm::Value *EmitMemberPointerConversion(CodeGenFunction &CGF, 171 const CastExpr *E, 172 llvm::Value *Src); 173 174 /// Perform a derived-to-base, base-to-derived, or bitcast member 175 /// pointer conversion on a constant value. 176 virtual llvm::Constant *EmitMemberPointerConversion(const CastExpr *E, 177 llvm::Constant *Src); 178 179 /// Return true if the given member pointer can be zero-initialized 180 /// (in the C++ sense) with an LLVM zeroinitializer. 181 virtual bool isZeroInitializable(const MemberPointerType *MPT); 182 183 /// Return whether or not a member pointers type is convertible to an IR type. 184 virtual bool isMemberPointerConvertible(const MemberPointerType *MPT) const { 185 return true; 186 } 187 188 /// Create a null member pointer of the given type. 189 virtual llvm::Constant *EmitNullMemberPointer(const MemberPointerType *MPT); 190 191 /// Create a member pointer for the given method. 192 virtual llvm::Constant *EmitMemberFunctionPointer(const CXXMethodDecl *MD); 193 194 /// Create a member pointer for the given field. 195 virtual llvm::Constant *EmitMemberDataPointer(const MemberPointerType *MPT, 196 CharUnits offset); 197 198 /// Create a member pointer for the given member pointer constant. 199 virtual llvm::Constant *EmitMemberPointer(const APValue &MP, QualType MPT); 200 201 /// Emit a comparison between two member pointers. Returns an i1. 202 virtual llvm::Value * 203 EmitMemberPointerComparison(CodeGenFunction &CGF, 204 llvm::Value *L, 205 llvm::Value *R, 206 const MemberPointerType *MPT, 207 bool Inequality); 208 209 /// Determine if a member pointer is non-null. Returns an i1. 210 virtual llvm::Value * 211 EmitMemberPointerIsNotNull(CodeGenFunction &CGF, 212 llvm::Value *MemPtr, 213 const MemberPointerType *MPT); 214 215 protected: 216 /// A utility method for computing the offset required for the given 217 /// base-to-derived or derived-to-base member-pointer conversion. 218 /// Does not handle virtual conversions (in case we ever fully 219 /// support an ABI that allows this). Returns null if no adjustment 220 /// is required. 221 llvm::Constant *getMemberPointerAdjustment(const CastExpr *E); 222 223 /// \brief Computes the non-virtual adjustment needed for a member pointer 224 /// conversion along an inheritance path stored in an APValue. Unlike 225 /// getMemberPointerAdjustment(), the adjustment can be negative if the path 226 /// is from a derived type to a base type. 227 CharUnits getMemberPointerPathAdjustment(const APValue &MP); 228 229 public: 230 virtual void emitVirtualObjectDelete(CodeGenFunction &CGF, 231 const CXXDeleteExpr *DE, 232 Address Ptr, QualType ElementType, 233 const CXXDestructorDecl *Dtor) = 0; 234 virtual void emitRethrow(CodeGenFunction &CGF, bool isNoReturn) = 0; 235 virtual void emitThrow(CodeGenFunction &CGF, const CXXThrowExpr *E) = 0; 236 virtual llvm::GlobalVariable *getThrowInfo(QualType T) { return nullptr; } 237 238 /// \brief Determine whether it's possible to emit a vtable for \p RD, even 239 /// though we do not know that the vtable has been marked as used by semantic 240 /// analysis. 241 virtual bool canSpeculativelyEmitVTable(const CXXRecordDecl *RD) const = 0; 242 243 virtual void emitBeginCatch(CodeGenFunction &CGF, const CXXCatchStmt *C) = 0; 244 245 virtual llvm::CallInst * 246 emitTerminateForUnexpectedException(CodeGenFunction &CGF, 247 llvm::Value *Exn); 248 249 virtual llvm::Constant *getAddrOfRTTIDescriptor(QualType Ty) = 0; 250 virtual CatchTypeInfo 251 getAddrOfCXXCatchHandlerType(QualType Ty, QualType CatchHandlerType) = 0; 252 virtual CatchTypeInfo getCatchAllTypeInfo(); 253 254 virtual bool shouldTypeidBeNullChecked(bool IsDeref, 255 QualType SrcRecordTy) = 0; 256 virtual void EmitBadTypeidCall(CodeGenFunction &CGF) = 0; 257 virtual llvm::Value *EmitTypeid(CodeGenFunction &CGF, QualType SrcRecordTy, 258 Address ThisPtr, 259 llvm::Type *StdTypeInfoPtrTy) = 0; 260 261 virtual bool shouldDynamicCastCallBeNullChecked(bool SrcIsPtr, 262 QualType SrcRecordTy) = 0; 263 264 virtual llvm::Value * 265 EmitDynamicCastCall(CodeGenFunction &CGF, Address Value, 266 QualType SrcRecordTy, QualType DestTy, 267 QualType DestRecordTy, llvm::BasicBlock *CastEnd) = 0; 268 269 virtual llvm::Value *EmitDynamicCastToVoid(CodeGenFunction &CGF, 270 Address Value, 271 QualType SrcRecordTy, 272 QualType DestTy) = 0; 273 274 virtual bool EmitBadCastCall(CodeGenFunction &CGF) = 0; 275 276 virtual llvm::Value *GetVirtualBaseClassOffset(CodeGenFunction &CGF, 277 Address This, 278 const CXXRecordDecl *ClassDecl, 279 const CXXRecordDecl *BaseClassDecl) = 0; 280 281 virtual llvm::BasicBlock *EmitCtorCompleteObjectHandler(CodeGenFunction &CGF, 282 const CXXRecordDecl *RD); 283 284 /// Emit the code to initialize hidden members required 285 /// to handle virtual inheritance, if needed by the ABI. 286 virtual void 287 initializeHiddenVirtualInheritanceMembers(CodeGenFunction &CGF, 288 const CXXRecordDecl *RD) {} 289 290 /// Emit constructor variants required by this ABI. 291 virtual void EmitCXXConstructors(const CXXConstructorDecl *D) = 0; 292 293 /// Build the signature of the given constructor or destructor variant by 294 /// adding any required parameters. For convenience, ArgTys has been 295 /// initialized with the type of 'this'. 296 virtual void buildStructorSignature(const CXXMethodDecl *MD, StructorType T, 297 SmallVectorImpl<CanQualType> &ArgTys) = 0; 298 299 /// Returns true if the given destructor type should be emitted as a linkonce 300 /// delegating thunk, regardless of whether the dtor is defined in this TU or 301 /// not. 302 virtual bool useThunkForDtorVariant(const CXXDestructorDecl *Dtor, 303 CXXDtorType DT) const = 0; 304 305 /// Emit destructor variants required by this ABI. 306 virtual void EmitCXXDestructors(const CXXDestructorDecl *D) = 0; 307 308 /// Get the type of the implicit "this" parameter used by a method. May return 309 /// zero if no specific type is applicable, e.g. if the ABI expects the "this" 310 /// parameter to point to some artificial offset in a complete object due to 311 /// vbases being reordered. 312 virtual const CXXRecordDecl * 313 getThisArgumentTypeForMethod(const CXXMethodDecl *MD) { 314 return MD->getParent(); 315 } 316 317 /// Perform ABI-specific "this" argument adjustment required prior to 318 /// a call of a virtual function. 319 /// The "VirtualCall" argument is true iff the call itself is virtual. 320 virtual Address 321 adjustThisArgumentForVirtualFunctionCall(CodeGenFunction &CGF, GlobalDecl GD, 322 Address This, bool VirtualCall) { 323 return This; 324 } 325 326 /// Build a parameter variable suitable for 'this'. 327 void buildThisParam(CodeGenFunction &CGF, FunctionArgList &Params); 328 329 /// Insert any ABI-specific implicit parameters into the parameter list for a 330 /// function. This generally involves extra data for constructors and 331 /// destructors. 332 /// 333 /// ABIs may also choose to override the return type, which has been 334 /// initialized with the type of 'this' if HasThisReturn(CGF.CurGD) is true or 335 /// the formal return type of the function otherwise. 336 virtual void addImplicitStructorParams(CodeGenFunction &CGF, QualType &ResTy, 337 FunctionArgList &Params) = 0; 338 339 /// Get the ABI-specific "this" parameter adjustment to apply in the prologue 340 /// of a virtual function. 341 virtual CharUnits getVirtualFunctionPrologueThisAdjustment(GlobalDecl GD) { 342 return CharUnits::Zero(); 343 } 344 345 /// Perform ABI-specific "this" parameter adjustment in a virtual function 346 /// prologue. 347 virtual llvm::Value *adjustThisParameterInVirtualFunctionPrologue( 348 CodeGenFunction &CGF, GlobalDecl GD, llvm::Value *This) { 349 return This; 350 } 351 352 /// Emit the ABI-specific prolog for the function. 353 virtual void EmitInstanceFunctionProlog(CodeGenFunction &CGF) = 0; 354 355 /// Add any ABI-specific implicit arguments needed to call a constructor. 356 /// 357 /// \return The number of args added to the call, which is typically zero or 358 /// one. 359 virtual unsigned 360 addImplicitConstructorArgs(CodeGenFunction &CGF, const CXXConstructorDecl *D, 361 CXXCtorType Type, bool ForVirtualBase, 362 bool Delegating, CallArgList &Args) = 0; 363 364 /// Emit the destructor call. 365 virtual void EmitDestructorCall(CodeGenFunction &CGF, 366 const CXXDestructorDecl *DD, CXXDtorType Type, 367 bool ForVirtualBase, bool Delegating, 368 Address This) = 0; 369 370 /// Emits the VTable definitions required for the given record type. 371 virtual void emitVTableDefinitions(CodeGenVTables &CGVT, 372 const CXXRecordDecl *RD) = 0; 373 374 /// Checks if ABI requires extra virtual offset for vtable field. 375 virtual bool 376 isVirtualOffsetNeededForVTableField(CodeGenFunction &CGF, 377 CodeGenFunction::VPtr Vptr) = 0; 378 379 /// Checks if ABI requires to initilize vptrs for given dynamic class. 380 virtual bool doStructorsInitializeVPtrs(const CXXRecordDecl *VTableClass) = 0; 381 382 /// Get the address point of the vtable for the given base subobject. 383 virtual llvm::Constant * 384 getVTableAddressPoint(BaseSubobject Base, 385 const CXXRecordDecl *VTableClass) = 0; 386 387 /// Get the address point of the vtable for the given base subobject while 388 /// building a constructor or a destructor. 389 virtual llvm::Value * 390 getVTableAddressPointInStructor(CodeGenFunction &CGF, const CXXRecordDecl *RD, 391 BaseSubobject Base, 392 const CXXRecordDecl *NearestVBase) = 0; 393 394 /// Get the address point of the vtable for the given base subobject while 395 /// building a constexpr. 396 virtual llvm::Constant * 397 getVTableAddressPointForConstExpr(BaseSubobject Base, 398 const CXXRecordDecl *VTableClass) = 0; 399 400 /// Get the address of the vtable for the given record decl which should be 401 /// used for the vptr at the given offset in RD. 402 virtual llvm::GlobalVariable *getAddrOfVTable(const CXXRecordDecl *RD, 403 CharUnits VPtrOffset) = 0; 404 405 /// Build a virtual function pointer in the ABI-specific way. 406 virtual llvm::Value *getVirtualFunctionPointer(CodeGenFunction &CGF, 407 GlobalDecl GD, 408 Address This, 409 llvm::Type *Ty, 410 SourceLocation Loc) = 0; 411 412 /// Emit the ABI-specific virtual destructor call. 413 virtual llvm::Value * 414 EmitVirtualDestructorCall(CodeGenFunction &CGF, const CXXDestructorDecl *Dtor, 415 CXXDtorType DtorType, Address This, 416 const CXXMemberCallExpr *CE) = 0; 417 418 virtual void adjustCallArgsForDestructorThunk(CodeGenFunction &CGF, 419 GlobalDecl GD, 420 CallArgList &CallArgs) {} 421 422 /// Emit any tables needed to implement virtual inheritance. For Itanium, 423 /// this emits virtual table tables. For the MSVC++ ABI, this emits virtual 424 /// base tables. 425 virtual void emitVirtualInheritanceTables(const CXXRecordDecl *RD) = 0; 426 427 virtual void setThunkLinkage(llvm::Function *Thunk, bool ForVTable, 428 GlobalDecl GD, bool ReturnAdjustment) = 0; 429 430 virtual llvm::Value *performThisAdjustment(CodeGenFunction &CGF, 431 Address This, 432 const ThisAdjustment &TA) = 0; 433 434 virtual llvm::Value *performReturnAdjustment(CodeGenFunction &CGF, 435 Address Ret, 436 const ReturnAdjustment &RA) = 0; 437 438 virtual void EmitReturnFromThunk(CodeGenFunction &CGF, 439 RValue RV, QualType ResultType); 440 441 virtual size_t getSrcArgforCopyCtor(const CXXConstructorDecl *, 442 FunctionArgList &Args) const = 0; 443 444 /// Gets the offsets of all the virtual base pointers in a given class. 445 virtual std::vector<CharUnits> getVBPtrOffsets(const CXXRecordDecl *RD); 446 447 /// Gets the pure virtual member call function. 448 virtual StringRef GetPureVirtualCallName() = 0; 449 450 /// Gets the deleted virtual member call name. 451 virtual StringRef GetDeletedVirtualCallName() = 0; 452 453 /**************************** Array cookies ******************************/ 454 455 /// Returns the extra size required in order to store the array 456 /// cookie for the given new-expression. May return 0 to indicate that no 457 /// array cookie is required. 458 /// 459 /// Several cases are filtered out before this method is called: 460 /// - non-array allocations never need a cookie 461 /// - calls to \::operator new(size_t, void*) never need a cookie 462 /// 463 /// \param expr - the new-expression being allocated. 464 virtual CharUnits GetArrayCookieSize(const CXXNewExpr *expr); 465 466 /// Initialize the array cookie for the given allocation. 467 /// 468 /// \param NewPtr - a char* which is the presumed-non-null 469 /// return value of the allocation function 470 /// \param NumElements - the computed number of elements, 471 /// potentially collapsed from the multidimensional array case; 472 /// always a size_t 473 /// \param ElementType - the base element allocated type, 474 /// i.e. the allocated type after stripping all array types 475 virtual Address InitializeArrayCookie(CodeGenFunction &CGF, 476 Address NewPtr, 477 llvm::Value *NumElements, 478 const CXXNewExpr *expr, 479 QualType ElementType); 480 481 /// Reads the array cookie associated with the given pointer, 482 /// if it has one. 483 /// 484 /// \param Ptr - a pointer to the first element in the array 485 /// \param ElementType - the base element type of elements of the array 486 /// \param NumElements - an out parameter which will be initialized 487 /// with the number of elements allocated, or zero if there is no 488 /// cookie 489 /// \param AllocPtr - an out parameter which will be initialized 490 /// with a char* pointing to the address returned by the allocation 491 /// function 492 /// \param CookieSize - an out parameter which will be initialized 493 /// with the size of the cookie, or zero if there is no cookie 494 virtual void ReadArrayCookie(CodeGenFunction &CGF, Address Ptr, 495 const CXXDeleteExpr *expr, 496 QualType ElementType, llvm::Value *&NumElements, 497 llvm::Value *&AllocPtr, CharUnits &CookieSize); 498 499 /// Return whether the given global decl needs a VTT parameter. 500 virtual bool NeedsVTTParameter(GlobalDecl GD); 501 502 protected: 503 /// Returns the extra size required in order to store the array 504 /// cookie for the given type. Assumes that an array cookie is 505 /// required. 506 virtual CharUnits getArrayCookieSizeImpl(QualType elementType); 507 508 /// Reads the array cookie for an allocation which is known to have one. 509 /// This is called by the standard implementation of ReadArrayCookie. 510 /// 511 /// \param ptr - a pointer to the allocation made for an array, as a char* 512 /// \param cookieSize - the computed cookie size of an array 513 /// 514 /// Other parameters are as above. 515 /// 516 /// \return a size_t 517 virtual llvm::Value *readArrayCookieImpl(CodeGenFunction &IGF, Address ptr, 518 CharUnits cookieSize); 519 520 public: 521 522 /*************************** Static local guards ****************************/ 523 524 /// Emits the guarded initializer and destructor setup for the given 525 /// variable, given that it couldn't be emitted as a constant. 526 /// If \p PerformInit is false, the initialization has been folded to a 527 /// constant and should not be performed. 528 /// 529 /// The variable may be: 530 /// - a static local variable 531 /// - a static data member of a class template instantiation 532 virtual void EmitGuardedInit(CodeGenFunction &CGF, const VarDecl &D, 533 llvm::GlobalVariable *DeclPtr, 534 bool PerformInit) = 0; 535 536 /// Emit code to force the execution of a destructor during global 537 /// teardown. The default implementation of this uses atexit. 538 /// 539 /// \param Dtor - a function taking a single pointer argument 540 /// \param Addr - a pointer to pass to the destructor function. 541 virtual void registerGlobalDtor(CodeGenFunction &CGF, const VarDecl &D, 542 llvm::Constant *Dtor, 543 llvm::Constant *Addr) = 0; 544 545 /*************************** thread_local initialization ********************/ 546 547 /// Emits ABI-required functions necessary to initialize thread_local 548 /// variables in this translation unit. 549 /// 550 /// \param CXXThreadLocals - The thread_local declarations in this translation 551 /// unit. 552 /// \param CXXThreadLocalInits - If this translation unit contains any 553 /// non-constant initialization or non-trivial destruction for 554 /// thread_local variables, a list of functions to perform the 555 /// initialization. 556 virtual void EmitThreadLocalInitFuncs( 557 CodeGenModule &CGM, ArrayRef<const VarDecl *> CXXThreadLocals, 558 ArrayRef<llvm::Function *> CXXThreadLocalInits, 559 ArrayRef<const VarDecl *> CXXThreadLocalInitVars) = 0; 560 561 // Determine if references to thread_local global variables can be made 562 // directly or require access through a thread wrapper function. 563 virtual bool usesThreadWrapperFunction() const = 0; 564 565 /// Emit a reference to a non-local thread_local variable (including 566 /// triggering the initialization of all thread_local variables in its 567 /// translation unit). 568 virtual LValue EmitThreadLocalVarDeclLValue(CodeGenFunction &CGF, 569 const VarDecl *VD, 570 QualType LValType) = 0; 571 572 /// Emit a single constructor/destructor with the given type from a C++ 573 /// constructor Decl. 574 virtual void emitCXXStructor(const CXXMethodDecl *MD, StructorType Type) = 0; 575 }; 576 577 // Create an instance of a C++ ABI class: 578 579 /// Creates an Itanium-family ABI. 580 CGCXXABI *CreateItaniumCXXABI(CodeGenModule &CGM); 581 582 /// Creates a Microsoft-family ABI. 583 CGCXXABI *CreateMicrosoftCXXABI(CodeGenModule &CGM); 584 585 } 586 } 587 588 #endif 589
