| //===----- CGCXXABI.h - Interface to C++ ABIs -------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This provides an abstract class for C++ code generation. Concrete subclasses |
| // of this implement code generation for specific C++ ABIs. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_CLANG_LIB_CODEGEN_CGCXXABI_H |
| #define LLVM_CLANG_LIB_CODEGEN_CGCXXABI_H |
| |
| #include "CodeGenFunction.h" |
| #include "clang/Basic/LLVM.h" |
| #include "clang/CodeGen/CodeGenABITypes.h" |
| |
| namespace llvm { |
| class Constant; |
| class Type; |
| class Value; |
| class CallInst; |
| } |
| |
| namespace clang { |
| class CastExpr; |
| class CXXConstructorDecl; |
| class CXXDestructorDecl; |
| class CXXMethodDecl; |
| class CXXRecordDecl; |
| class FieldDecl; |
| class MangleContext; |
| |
| namespace CodeGen { |
| class CGCallee; |
| class CodeGenFunction; |
| class CodeGenModule; |
| struct CatchTypeInfo; |
| |
| /// Implements C++ ABI-specific code generation functions. |
| class CGCXXABI { |
| protected: |
| CodeGenModule &CGM; |
| std::unique_ptr<MangleContext> MangleCtx; |
| |
| CGCXXABI(CodeGenModule &CGM) |
| : CGM(CGM), MangleCtx(CGM.getContext().createMangleContext()) {} |
| |
| protected: |
| ImplicitParamDecl *getThisDecl(CodeGenFunction &CGF) { |
| return CGF.CXXABIThisDecl; |
| } |
| llvm::Value *getThisValue(CodeGenFunction &CGF) { |
| return CGF.CXXABIThisValue; |
| } |
| Address getThisAddress(CodeGenFunction &CGF) { |
| return Address(CGF.CXXABIThisValue, CGF.CXXABIThisAlignment); |
| } |
| |
| /// Issue a diagnostic about unsupported features in the ABI. |
| void ErrorUnsupportedABI(CodeGenFunction &CGF, StringRef S); |
| |
| /// Get a null value for unsupported member pointers. |
| llvm::Constant *GetBogusMemberPointer(QualType T); |
| |
| ImplicitParamDecl *&getStructorImplicitParamDecl(CodeGenFunction &CGF) { |
| return CGF.CXXStructorImplicitParamDecl; |
| } |
| llvm::Value *&getStructorImplicitParamValue(CodeGenFunction &CGF) { |
| return CGF.CXXStructorImplicitParamValue; |
| } |
| |
| /// Loads the incoming C++ this pointer as it was passed by the caller. |
| llvm::Value *loadIncomingCXXThis(CodeGenFunction &CGF); |
| |
| void setCXXABIThisValue(CodeGenFunction &CGF, llvm::Value *ThisPtr); |
| |
| ASTContext &getContext() const { return CGM.getContext(); } |
| |
| virtual bool requiresArrayCookie(const CXXDeleteExpr *E, QualType eltType); |
| virtual bool requiresArrayCookie(const CXXNewExpr *E); |
| |
| /// Determine whether there's something special about the rules of |
| /// the ABI tell us that 'this' is a complete object within the |
| /// given function. Obvious common logic like being defined on a |
| /// final class will have been taken care of by the caller. |
| virtual bool isThisCompleteObject(GlobalDecl GD) const = 0; |
| |
| public: |
| |
| virtual ~CGCXXABI(); |
| |
| /// Gets the mangle context. |
| MangleContext &getMangleContext() { |
| return *MangleCtx; |
| } |
| |
| /// Returns true if the given constructor or destructor is one of the |
| /// kinds that the ABI says returns 'this' (only applies when called |
| /// non-virtually for destructors). |
| /// |
| /// There currently is no way to indicate if a destructor returns 'this' |
| /// when called virtually, and code generation does not support the case. |
| virtual bool HasThisReturn(GlobalDecl GD) const { return false; } |
| |
| virtual bool hasMostDerivedReturn(GlobalDecl GD) const { return false; } |
| |
| virtual bool useSinitAndSterm() const { return false; } |
| |
| /// Returns true if the target allows calling a function through a pointer |
| /// with a different signature than the actual function (or equivalently, |
| /// bitcasting a function or function pointer to a different function type). |
| /// In principle in the most general case this could depend on the target, the |
| /// calling convention, and the actual types of the arguments and return |
| /// value. Here it just means whether the signature mismatch could *ever* be |
| /// allowed; in other words, does the target do strict checking of signatures |
| /// for all calls. |
| virtual bool canCallMismatchedFunctionType() const { return true; } |
| |
| /// If the C++ ABI requires the given type be returned in a particular way, |
| /// this method sets RetAI and returns true. |
| virtual bool classifyReturnType(CGFunctionInfo &FI) const = 0; |
| |
| /// Specify how one should pass an argument of a record type. |
| enum RecordArgABI { |
| /// Pass it using the normal C aggregate rules for the ABI, potentially |
| /// introducing extra copies and passing some or all of it in registers. |
| RAA_Default = 0, |
| |
| /// Pass it on the stack using its defined layout. The argument must be |
| /// evaluated directly into the correct stack position in the arguments area, |
| /// and the call machinery must not move it or introduce extra copies. |
| RAA_DirectInMemory, |
| |
| /// Pass it as a pointer to temporary memory. |
| RAA_Indirect |
| }; |
| |
| /// Returns how an argument of the given record type should be passed. |
| virtual RecordArgABI getRecordArgABI(const CXXRecordDecl *RD) const = 0; |
| |
| /// Returns true if the implicit 'sret' parameter comes after the implicit |
| /// 'this' parameter of C++ instance methods. |
| virtual bool isSRetParameterAfterThis() const { return false; } |
| |
| /// Find the LLVM type used to represent the given member pointer |
| /// type. |
| virtual llvm::Type * |
| ConvertMemberPointerType(const MemberPointerType *MPT); |
| |
| /// Load a member function from an object and a member function |
| /// pointer. Apply the this-adjustment and set 'This' to the |
| /// adjusted value. |
| virtual CGCallee EmitLoadOfMemberFunctionPointer( |
| CodeGenFunction &CGF, const Expr *E, Address This, |
| llvm::Value *&ThisPtrForCall, llvm::Value *MemPtr, |
| const MemberPointerType *MPT); |
| |
| /// Calculate an l-value from an object and a data member pointer. |
| virtual llvm::Value * |
| EmitMemberDataPointerAddress(CodeGenFunction &CGF, const Expr *E, |
| Address Base, llvm::Value *MemPtr, |
| const MemberPointerType *MPT); |
| |
| /// Perform a derived-to-base, base-to-derived, or bitcast member |
| /// pointer conversion. |
| virtual llvm::Value *EmitMemberPointerConversion(CodeGenFunction &CGF, |
| const CastExpr *E, |
| llvm::Value *Src); |
| |
| /// Perform a derived-to-base, base-to-derived, or bitcast member |
| /// pointer conversion on a constant value. |
| virtual llvm::Constant *EmitMemberPointerConversion(const CastExpr *E, |
| llvm::Constant *Src); |
| |
| /// Return true if the given member pointer can be zero-initialized |
| /// (in the C++ sense) with an LLVM zeroinitializer. |
| virtual bool isZeroInitializable(const MemberPointerType *MPT); |
| |
| /// Return whether or not a member pointers type is convertible to an IR type. |
| virtual bool isMemberPointerConvertible(const MemberPointerType *MPT) const { |
| return true; |
| } |
| |
| /// Create a null member pointer of the given type. |
| virtual llvm::Constant *EmitNullMemberPointer(const MemberPointerType *MPT); |
| |
| /// Create a member pointer for the given method. |
| virtual llvm::Constant *EmitMemberFunctionPointer(const CXXMethodDecl *MD); |
| |
| /// Create a member pointer for the given field. |
| virtual llvm::Constant *EmitMemberDataPointer(const MemberPointerType *MPT, |
| CharUnits offset); |
| |
| /// Create a member pointer for the given member pointer constant. |
| virtual llvm::Constant *EmitMemberPointer(const APValue &MP, QualType MPT); |
| |
| /// Emit a comparison between two member pointers. Returns an i1. |
| virtual llvm::Value * |
| EmitMemberPointerComparison(CodeGenFunction &CGF, |
| llvm::Value *L, |
| llvm::Value *R, |
| const MemberPointerType *MPT, |
| bool Inequality); |
| |
| /// Determine if a member pointer is non-null. Returns an i1. |
| virtual llvm::Value * |
| EmitMemberPointerIsNotNull(CodeGenFunction &CGF, |
| llvm::Value *MemPtr, |
| const MemberPointerType *MPT); |
| |
| protected: |
| /// A utility method for computing the offset required for the given |
| /// base-to-derived or derived-to-base member-pointer conversion. |
| /// Does not handle virtual conversions (in case we ever fully |
| /// support an ABI that allows this). Returns null if no adjustment |
| /// is required. |
| llvm::Constant *getMemberPointerAdjustment(const CastExpr *E); |
| |
| /// Computes the non-virtual adjustment needed for a member pointer |
| /// conversion along an inheritance path stored in an APValue. Unlike |
| /// getMemberPointerAdjustment(), the adjustment can be negative if the path |
| /// is from a derived type to a base type. |
| CharUnits getMemberPointerPathAdjustment(const APValue &MP); |
| |
| public: |
| virtual void emitVirtualObjectDelete(CodeGenFunction &CGF, |
| const CXXDeleteExpr *DE, |
| Address Ptr, QualType ElementType, |
| const CXXDestructorDecl *Dtor) = 0; |
| virtual void emitRethrow(CodeGenFunction &CGF, bool isNoReturn) = 0; |
| virtual void emitThrow(CodeGenFunction &CGF, const CXXThrowExpr *E) = 0; |
| virtual llvm::GlobalVariable *getThrowInfo(QualType T) { return nullptr; } |
| |
| /// Determine whether it's possible to emit a vtable for \p RD, even |
| /// though we do not know that the vtable has been marked as used by semantic |
| /// analysis. |
| virtual bool canSpeculativelyEmitVTable(const CXXRecordDecl *RD) const = 0; |
| |
| virtual void emitBeginCatch(CodeGenFunction &CGF, const CXXCatchStmt *C) = 0; |
| |
| virtual llvm::CallInst * |
| emitTerminateForUnexpectedException(CodeGenFunction &CGF, |
| llvm::Value *Exn); |
| |
| virtual llvm::Constant *getAddrOfRTTIDescriptor(QualType Ty) = 0; |
| virtual CatchTypeInfo |
| getAddrOfCXXCatchHandlerType(QualType Ty, QualType CatchHandlerType) = 0; |
| virtual CatchTypeInfo getCatchAllTypeInfo(); |
| |
| virtual bool shouldTypeidBeNullChecked(bool IsDeref, |
| QualType SrcRecordTy) = 0; |
| virtual void EmitBadTypeidCall(CodeGenFunction &CGF) = 0; |
| virtual llvm::Value *EmitTypeid(CodeGenFunction &CGF, QualType SrcRecordTy, |
| Address ThisPtr, |
| llvm::Type *StdTypeInfoPtrTy) = 0; |
| |
| virtual bool shouldDynamicCastCallBeNullChecked(bool SrcIsPtr, |
| QualType SrcRecordTy) = 0; |
| |
| virtual llvm::Value * |
| EmitDynamicCastCall(CodeGenFunction &CGF, Address Value, |
| QualType SrcRecordTy, QualType DestTy, |
| QualType DestRecordTy, llvm::BasicBlock *CastEnd) = 0; |
| |
| virtual llvm::Value *EmitDynamicCastToVoid(CodeGenFunction &CGF, |
| Address Value, |
| QualType SrcRecordTy, |
| QualType DestTy) = 0; |
| |
| virtual bool EmitBadCastCall(CodeGenFunction &CGF) = 0; |
| |
| virtual llvm::Value *GetVirtualBaseClassOffset(CodeGenFunction &CGF, |
| Address This, |
| const CXXRecordDecl *ClassDecl, |
| const CXXRecordDecl *BaseClassDecl) = 0; |
| |
| virtual llvm::BasicBlock *EmitCtorCompleteObjectHandler(CodeGenFunction &CGF, |
| const CXXRecordDecl *RD); |
| |
| /// Emit the code to initialize hidden members required |
| /// to handle virtual inheritance, if needed by the ABI. |
| virtual void |
| initializeHiddenVirtualInheritanceMembers(CodeGenFunction &CGF, |
| const CXXRecordDecl *RD) {} |
| |
| /// Emit constructor variants required by this ABI. |
| virtual void EmitCXXConstructors(const CXXConstructorDecl *D) = 0; |
| |
| /// Additional implicit arguments to add to the beginning (Prefix) and end |
| /// (Suffix) of a constructor / destructor arg list. |
| /// |
| /// Note that Prefix should actually be inserted *after* the first existing |
| /// arg; `this` arguments always come first. |
| struct AddedStructorArgs { |
| struct Arg { |
| llvm::Value *Value; |
| QualType Type; |
| }; |
| SmallVector<Arg, 1> Prefix; |
| SmallVector<Arg, 1> Suffix; |
| AddedStructorArgs() = default; |
| AddedStructorArgs(SmallVector<Arg, 1> P, SmallVector<Arg, 1> S) |
| : Prefix(std::move(P)), Suffix(std::move(S)) {} |
| static AddedStructorArgs prefix(SmallVector<Arg, 1> Args) { |
| return {std::move(Args), {}}; |
| } |
| static AddedStructorArgs suffix(SmallVector<Arg, 1> Args) { |
| return {{}, std::move(Args)}; |
| } |
| }; |
| |
| /// Similar to AddedStructorArgs, but only notes the number of additional |
| /// arguments. |
| struct AddedStructorArgCounts { |
| unsigned Prefix = 0; |
| unsigned Suffix = 0; |
| AddedStructorArgCounts() = default; |
| AddedStructorArgCounts(unsigned P, unsigned S) : Prefix(P), Suffix(S) {} |
| static AddedStructorArgCounts prefix(unsigned N) { return {N, 0}; } |
| static AddedStructorArgCounts suffix(unsigned N) { return {0, N}; } |
| }; |
| |
| /// Build the signature of the given constructor or destructor variant by |
| /// adding any required parameters. For convenience, ArgTys has been |
| /// initialized with the type of 'this'. |
| virtual AddedStructorArgCounts |
| buildStructorSignature(GlobalDecl GD, |
| SmallVectorImpl<CanQualType> &ArgTys) = 0; |
| |
| /// Returns true if the given destructor type should be emitted as a linkonce |
| /// delegating thunk, regardless of whether the dtor is defined in this TU or |
| /// not. |
| virtual bool useThunkForDtorVariant(const CXXDestructorDecl *Dtor, |
| CXXDtorType DT) const = 0; |
| |
| virtual void setCXXDestructorDLLStorage(llvm::GlobalValue *GV, |
| const CXXDestructorDecl *Dtor, |
| CXXDtorType DT) const; |
| |
| virtual llvm::GlobalValue::LinkageTypes |
| getCXXDestructorLinkage(GVALinkage Linkage, const CXXDestructorDecl *Dtor, |
| CXXDtorType DT) const; |
| |
| /// Emit destructor variants required by this ABI. |
| virtual void EmitCXXDestructors(const CXXDestructorDecl *D) = 0; |
| |
| /// Get the type of the implicit "this" parameter used by a method. May return |
| /// zero if no specific type is applicable, e.g. if the ABI expects the "this" |
| /// parameter to point to some artificial offset in a complete object due to |
| /// vbases being reordered. |
| virtual const CXXRecordDecl * |
| getThisArgumentTypeForMethod(const CXXMethodDecl *MD) { |
| return MD->getParent(); |
| } |
| |
| /// Perform ABI-specific "this" argument adjustment required prior to |
| /// a call of a virtual function. |
| /// The "VirtualCall" argument is true iff the call itself is virtual. |
| virtual Address |
| adjustThisArgumentForVirtualFunctionCall(CodeGenFunction &CGF, GlobalDecl GD, |
| Address This, bool VirtualCall) { |
| return This; |
| } |
| |
| /// Build a parameter variable suitable for 'this'. |
| void buildThisParam(CodeGenFunction &CGF, FunctionArgList &Params); |
| |
| /// Insert any ABI-specific implicit parameters into the parameter list for a |
| /// function. This generally involves extra data for constructors and |
| /// destructors. |
| /// |
| /// ABIs may also choose to override the return type, which has been |
| /// initialized with the type of 'this' if HasThisReturn(CGF.CurGD) is true or |
| /// the formal return type of the function otherwise. |
| virtual void addImplicitStructorParams(CodeGenFunction &CGF, QualType &ResTy, |
| FunctionArgList &Params) = 0; |
| |
| /// Get the ABI-specific "this" parameter adjustment to apply in the prologue |
| /// of a virtual function. |
| virtual CharUnits getVirtualFunctionPrologueThisAdjustment(GlobalDecl GD) { |
| return CharUnits::Zero(); |
| } |
| |
| /// Emit the ABI-specific prolog for the function. |
| virtual void EmitInstanceFunctionProlog(CodeGenFunction &CGF) = 0; |
| |
| virtual AddedStructorArgs |
| getImplicitConstructorArgs(CodeGenFunction &CGF, const CXXConstructorDecl *D, |
| CXXCtorType Type, bool ForVirtualBase, |
| bool Delegating) = 0; |
| |
| /// Add any ABI-specific implicit arguments needed to call a constructor. |
| /// |
| /// \return The number of arguments added at the beginning and end of the |
| /// call, which is typically zero or one. |
| AddedStructorArgCounts |
| addImplicitConstructorArgs(CodeGenFunction &CGF, const CXXConstructorDecl *D, |
| CXXCtorType Type, bool ForVirtualBase, |
| bool Delegating, CallArgList &Args); |
| |
| /// Get the implicit (second) parameter that comes after the "this" pointer, |
| /// or nullptr if there is isn't one. |
| virtual llvm::Value * |
| getCXXDestructorImplicitParam(CodeGenFunction &CGF, |
| const CXXDestructorDecl *DD, CXXDtorType Type, |
| bool ForVirtualBase, bool Delegating) = 0; |
| |
| /// Emit the destructor call. |
| virtual void EmitDestructorCall(CodeGenFunction &CGF, |
| const CXXDestructorDecl *DD, CXXDtorType Type, |
| bool ForVirtualBase, bool Delegating, |
| Address This, QualType ThisTy) = 0; |
| |
| /// Emits the VTable definitions required for the given record type. |
| virtual void emitVTableDefinitions(CodeGenVTables &CGVT, |
| const CXXRecordDecl *RD) = 0; |
| |
| /// Checks if ABI requires extra virtual offset for vtable field. |
| virtual bool |
| isVirtualOffsetNeededForVTableField(CodeGenFunction &CGF, |
| CodeGenFunction::VPtr Vptr) = 0; |
| |
| /// Checks if ABI requires to initialize vptrs for given dynamic class. |
| virtual bool doStructorsInitializeVPtrs(const CXXRecordDecl *VTableClass) = 0; |
| |
| /// Get the address point of the vtable for the given base subobject. |
| virtual llvm::Constant * |
| getVTableAddressPoint(BaseSubobject Base, |
| const CXXRecordDecl *VTableClass) = 0; |
| |
| /// Get the address point of the vtable for the given base subobject while |
| /// building a constructor or a destructor. |
| virtual llvm::Value * |
| getVTableAddressPointInStructor(CodeGenFunction &CGF, const CXXRecordDecl *RD, |
| BaseSubobject Base, |
| const CXXRecordDecl *NearestVBase) = 0; |
| |
| /// Get the address point of the vtable for the given base subobject while |
| /// building a constexpr. |
| virtual llvm::Constant * |
| getVTableAddressPointForConstExpr(BaseSubobject Base, |
| const CXXRecordDecl *VTableClass) = 0; |
| |
| /// Get the address of the vtable for the given record decl which should be |
| /// used for the vptr at the given offset in RD. |
| virtual llvm::GlobalVariable *getAddrOfVTable(const CXXRecordDecl *RD, |
| CharUnits VPtrOffset) = 0; |
| |
| /// Build a virtual function pointer in the ABI-specific way. |
| virtual CGCallee getVirtualFunctionPointer(CodeGenFunction &CGF, |
| GlobalDecl GD, Address This, |
| llvm::Type *Ty, |
| SourceLocation Loc) = 0; |
| |
| using DeleteOrMemberCallExpr = |
| llvm::PointerUnion<const CXXDeleteExpr *, const CXXMemberCallExpr *>; |
| |
| /// Emit the ABI-specific virtual destructor call. |
| virtual llvm::Value *EmitVirtualDestructorCall(CodeGenFunction &CGF, |
| const CXXDestructorDecl *Dtor, |
| CXXDtorType DtorType, |
| Address This, |
| DeleteOrMemberCallExpr E) = 0; |
| |
| virtual void adjustCallArgsForDestructorThunk(CodeGenFunction &CGF, |
| GlobalDecl GD, |
| CallArgList &CallArgs) {} |
| |
| /// Emit any tables needed to implement virtual inheritance. For Itanium, |
| /// this emits virtual table tables. For the MSVC++ ABI, this emits virtual |
| /// base tables. |
| virtual void emitVirtualInheritanceTables(const CXXRecordDecl *RD) = 0; |
| |
| virtual bool exportThunk() = 0; |
| virtual void setThunkLinkage(llvm::Function *Thunk, bool ForVTable, |
| GlobalDecl GD, bool ReturnAdjustment) = 0; |
| |
| virtual llvm::Value *performThisAdjustment(CodeGenFunction &CGF, |
| Address This, |
| const ThisAdjustment &TA) = 0; |
| |
| virtual llvm::Value *performReturnAdjustment(CodeGenFunction &CGF, |
| Address Ret, |
| const ReturnAdjustment &RA) = 0; |
| |
| virtual void EmitReturnFromThunk(CodeGenFunction &CGF, |
| RValue RV, QualType ResultType); |
| |
| virtual size_t getSrcArgforCopyCtor(const CXXConstructorDecl *, |
| FunctionArgList &Args) const = 0; |
| |
| /// Gets the offsets of all the virtual base pointers in a given class. |
| virtual std::vector<CharUnits> getVBPtrOffsets(const CXXRecordDecl *RD); |
| |
| /// Gets the pure virtual member call function. |
| virtual StringRef GetPureVirtualCallName() = 0; |
| |
| /// Gets the deleted virtual member call name. |
| virtual StringRef GetDeletedVirtualCallName() = 0; |
| |
| /**************************** Array cookies ******************************/ |
| |
| /// Returns the extra size required in order to store the array |
| /// cookie for the given new-expression. May return 0 to indicate that no |
| /// array cookie is required. |
| /// |
| /// Several cases are filtered out before this method is called: |
| /// - non-array allocations never need a cookie |
| /// - calls to \::operator new(size_t, void*) never need a cookie |
| /// |
| /// \param expr - the new-expression being allocated. |
| virtual CharUnits GetArrayCookieSize(const CXXNewExpr *expr); |
| |
| /// Initialize the array cookie for the given allocation. |
| /// |
| /// \param NewPtr - a char* which is the presumed-non-null |
| /// return value of the allocation function |
| /// \param NumElements - the computed number of elements, |
| /// potentially collapsed from the multidimensional array case; |
| /// always a size_t |
| /// \param ElementType - the base element allocated type, |
| /// i.e. the allocated type after stripping all array types |
| virtual Address InitializeArrayCookie(CodeGenFunction &CGF, |
| Address NewPtr, |
| llvm::Value *NumElements, |
| const CXXNewExpr *expr, |
| QualType ElementType); |
| |
| /// Reads the array cookie associated with the given pointer, |
| /// if it has one. |
| /// |
| /// \param Ptr - a pointer to the first element in the array |
| /// \param ElementType - the base element type of elements of the array |
| /// \param NumElements - an out parameter which will be initialized |
| /// with the number of elements allocated, or zero if there is no |
| /// cookie |
| /// \param AllocPtr - an out parameter which will be initialized |
| /// with a char* pointing to the address returned by the allocation |
| /// function |
| /// \param CookieSize - an out parameter which will be initialized |
| /// with the size of the cookie, or zero if there is no cookie |
| virtual void ReadArrayCookie(CodeGenFunction &CGF, Address Ptr, |
| const CXXDeleteExpr *expr, |
| QualType ElementType, llvm::Value *&NumElements, |
| llvm::Value *&AllocPtr, CharUnits &CookieSize); |
| |
| /// Return whether the given global decl needs a VTT parameter. |
| virtual bool NeedsVTTParameter(GlobalDecl GD); |
| |
| protected: |
| /// Returns the extra size required in order to store the array |
| /// cookie for the given type. Assumes that an array cookie is |
| /// required. |
| virtual CharUnits getArrayCookieSizeImpl(QualType elementType); |
| |
| /// Reads the array cookie for an allocation which is known to have one. |
| /// This is called by the standard implementation of ReadArrayCookie. |
| /// |
| /// \param ptr - a pointer to the allocation made for an array, as a char* |
| /// \param cookieSize - the computed cookie size of an array |
| /// |
| /// Other parameters are as above. |
| /// |
| /// \return a size_t |
| virtual llvm::Value *readArrayCookieImpl(CodeGenFunction &IGF, Address ptr, |
| CharUnits cookieSize); |
| |
| public: |
| |
| /*************************** Static local guards ****************************/ |
| |
| /// Emits the guarded initializer and destructor setup for the given |
| /// variable, given that it couldn't be emitted as a constant. |
| /// If \p PerformInit is false, the initialization has been folded to a |
| /// constant and should not be performed. |
| /// |
| /// The variable may be: |
| /// - a static local variable |
| /// - a static data member of a class template instantiation |
| virtual void EmitGuardedInit(CodeGenFunction &CGF, const VarDecl &D, |
| llvm::GlobalVariable *DeclPtr, |
| bool PerformInit) = 0; |
| |
| /// Emit code to force the execution of a destructor during global |
| /// teardown. The default implementation of this uses atexit. |
| /// |
| /// \param Dtor - a function taking a single pointer argument |
| /// \param Addr - a pointer to pass to the destructor function. |
| virtual void registerGlobalDtor(CodeGenFunction &CGF, const VarDecl &D, |
| llvm::FunctionCallee Dtor, |
| llvm::Constant *Addr) = 0; |
| |
| /*************************** thread_local initialization ********************/ |
| |
| /// Emits ABI-required functions necessary to initialize thread_local |
| /// variables in this translation unit. |
| /// |
| /// \param CXXThreadLocals - The thread_local declarations in this translation |
| /// unit. |
| /// \param CXXThreadLocalInits - If this translation unit contains any |
| /// non-constant initialization or non-trivial destruction for |
| /// thread_local variables, a list of functions to perform the |
| /// initialization. |
| virtual void EmitThreadLocalInitFuncs( |
| CodeGenModule &CGM, ArrayRef<const VarDecl *> CXXThreadLocals, |
| ArrayRef<llvm::Function *> CXXThreadLocalInits, |
| ArrayRef<const VarDecl *> CXXThreadLocalInitVars) = 0; |
| |
| // Determine if references to thread_local global variables can be made |
| // directly or require access through a thread wrapper function. |
| virtual bool usesThreadWrapperFunction(const VarDecl *VD) const = 0; |
| |
| /// Emit a reference to a non-local thread_local variable (including |
| /// triggering the initialization of all thread_local variables in its |
| /// translation unit). |
| virtual LValue EmitThreadLocalVarDeclLValue(CodeGenFunction &CGF, |
| const VarDecl *VD, |
| QualType LValType) = 0; |
| |
| /// Emit a single constructor/destructor with the given type from a C++ |
| /// constructor Decl. |
| virtual void emitCXXStructor(GlobalDecl GD) = 0; |
| |
| /// Load a vtable from This, an object of polymorphic type RD, or from one of |
| /// its virtual bases if it does not have its own vtable. Returns the vtable |
| /// and the class from which the vtable was loaded. |
| virtual std::pair<llvm::Value *, const CXXRecordDecl *> |
| LoadVTablePtr(CodeGenFunction &CGF, Address This, |
| const CXXRecordDecl *RD) = 0; |
| }; |
| |
| // Create an instance of a C++ ABI class: |
| |
| /// Creates an Itanium-family ABI. |
| CGCXXABI *CreateItaniumCXXABI(CodeGenModule &CGM); |
| |
| /// Creates a Microsoft-family ABI. |
| CGCXXABI *CreateMicrosoftCXXABI(CodeGenModule &CGM); |
| |
| struct CatchRetScope final : EHScopeStack::Cleanup { |
| llvm::CatchPadInst *CPI; |
| |
| CatchRetScope(llvm::CatchPadInst *CPI) : CPI(CPI) {} |
| |
| void Emit(CodeGenFunction &CGF, Flags flags) override { |
| llvm::BasicBlock *BB = CGF.createBasicBlock("catchret.dest"); |
| CGF.Builder.CreateCatchRet(CPI, BB); |
| CGF.EmitBlock(BB); |
| } |
| }; |
| } |
| } |
| |
| #endif |