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589 lines
25 KiB
589 lines
25 KiB
//===----- CGCXXABI.h - Interface to C++ ABIs -------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This provides an abstract class for C++ code generation. Concrete subclasses
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// of this implement code generation for specific C++ ABIs.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_LIB_CODEGEN_CGCXXABI_H
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#define LLVM_CLANG_LIB_CODEGEN_CGCXXABI_H
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#include "CodeGenFunction.h"
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#include "clang/Basic/LLVM.h"
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namespace llvm {
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class Constant;
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class Type;
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class Value;
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class CallInst;
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}
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namespace clang {
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class CastExpr;
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class CXXConstructorDecl;
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class CXXDestructorDecl;
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class CXXMethodDecl;
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class CXXRecordDecl;
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class FieldDecl;
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class MangleContext;
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namespace CodeGen {
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class CodeGenFunction;
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class CodeGenModule;
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struct CatchTypeInfo;
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/// \brief Implements C++ ABI-specific code generation functions.
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class CGCXXABI {
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protected:
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CodeGenModule &CGM;
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std::unique_ptr<MangleContext> MangleCtx;
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CGCXXABI(CodeGenModule &CGM)
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: CGM(CGM), MangleCtx(CGM.getContext().createMangleContext()) {}
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protected:
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ImplicitParamDecl *getThisDecl(CodeGenFunction &CGF) {
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return CGF.CXXABIThisDecl;
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}
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llvm::Value *getThisValue(CodeGenFunction &CGF) {
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return CGF.CXXABIThisValue;
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}
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Address getThisAddress(CodeGenFunction &CGF) {
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return Address(CGF.CXXABIThisValue, CGF.CXXABIThisAlignment);
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}
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/// Issue a diagnostic about unsupported features in the ABI.
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void ErrorUnsupportedABI(CodeGenFunction &CGF, StringRef S);
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/// Get a null value for unsupported member pointers.
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llvm::Constant *GetBogusMemberPointer(QualType T);
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ImplicitParamDecl *&getStructorImplicitParamDecl(CodeGenFunction &CGF) {
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return CGF.CXXStructorImplicitParamDecl;
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}
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llvm::Value *&getStructorImplicitParamValue(CodeGenFunction &CGF) {
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return CGF.CXXStructorImplicitParamValue;
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}
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/// Perform prolog initialization of the parameter variable suitable
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/// for 'this' emitted by buildThisParam.
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void EmitThisParam(CodeGenFunction &CGF);
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ASTContext &getContext() const { return CGM.getContext(); }
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virtual bool requiresArrayCookie(const CXXDeleteExpr *E, QualType eltType);
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virtual bool requiresArrayCookie(const CXXNewExpr *E);
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/// Determine whether there's something special about the rules of
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/// the ABI tell us that 'this' is a complete object within the
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/// given function. Obvious common logic like being defined on a
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/// final class will have been taken care of by the caller.
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virtual bool isThisCompleteObject(GlobalDecl GD) const = 0;
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public:
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virtual ~CGCXXABI();
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/// Gets the mangle context.
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MangleContext &getMangleContext() {
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return *MangleCtx;
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}
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/// Returns true if the given constructor or destructor is one of the
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/// kinds that the ABI says returns 'this' (only applies when called
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/// non-virtually for destructors).
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///
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/// There currently is no way to indicate if a destructor returns 'this'
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/// when called virtually, and code generation does not support the case.
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virtual bool HasThisReturn(GlobalDecl GD) const { return false; }
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virtual bool hasMostDerivedReturn(GlobalDecl GD) const { return false; }
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/// Returns true if the target allows calling a function through a pointer
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/// with a different signature than the actual function (or equivalently,
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/// bitcasting a function or function pointer to a different function type).
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/// In principle in the most general case this could depend on the target, the
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/// calling convention, and the actual types of the arguments and return
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/// value. Here it just means whether the signature mismatch could *ever* be
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/// allowed; in other words, does the target do strict checking of signatures
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/// for all calls.
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virtual bool canCallMismatchedFunctionType() const { return true; }
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/// If the C++ ABI requires the given type be returned in a particular way,
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/// this method sets RetAI and returns true.
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virtual bool classifyReturnType(CGFunctionInfo &FI) const = 0;
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/// Specify how one should pass an argument of a record type.
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enum RecordArgABI {
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/// Pass it using the normal C aggregate rules for the ABI, potentially
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/// introducing extra copies and passing some or all of it in registers.
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RAA_Default = 0,
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/// Pass it on the stack using its defined layout. The argument must be
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/// evaluated directly into the correct stack position in the arguments area,
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/// and the call machinery must not move it or introduce extra copies.
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RAA_DirectInMemory,
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/// Pass it as a pointer to temporary memory.
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RAA_Indirect
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};
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/// Returns true if C++ allows us to copy the memory of an object of type RD
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/// when it is passed as an argument.
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bool canCopyArgument(const CXXRecordDecl *RD) const;
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/// Returns how an argument of the given record type should be passed.
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virtual RecordArgABI getRecordArgABI(const CXXRecordDecl *RD) const = 0;
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/// Returns true if the implicit 'sret' parameter comes after the implicit
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/// 'this' parameter of C++ instance methods.
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virtual bool isSRetParameterAfterThis() const { return false; }
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/// Find the LLVM type used to represent the given member pointer
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/// type.
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virtual llvm::Type *
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ConvertMemberPointerType(const MemberPointerType *MPT);
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/// Load a member function from an object and a member function
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/// pointer. Apply the this-adjustment and set 'This' to the
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/// adjusted value.
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virtual llvm::Value *EmitLoadOfMemberFunctionPointer(
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CodeGenFunction &CGF, const Expr *E, Address This,
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llvm::Value *&ThisPtrForCall, llvm::Value *MemPtr,
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const MemberPointerType *MPT);
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/// Calculate an l-value from an object and a data member pointer.
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virtual llvm::Value *
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EmitMemberDataPointerAddress(CodeGenFunction &CGF, const Expr *E,
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Address Base, llvm::Value *MemPtr,
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const MemberPointerType *MPT);
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/// Perform a derived-to-base, base-to-derived, or bitcast member
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/// pointer conversion.
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virtual llvm::Value *EmitMemberPointerConversion(CodeGenFunction &CGF,
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const CastExpr *E,
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llvm::Value *Src);
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/// Perform a derived-to-base, base-to-derived, or bitcast member
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/// pointer conversion on a constant value.
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virtual llvm::Constant *EmitMemberPointerConversion(const CastExpr *E,
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llvm::Constant *Src);
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/// Return true if the given member pointer can be zero-initialized
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/// (in the C++ sense) with an LLVM zeroinitializer.
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virtual bool isZeroInitializable(const MemberPointerType *MPT);
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/// Return whether or not a member pointers type is convertible to an IR type.
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virtual bool isMemberPointerConvertible(const MemberPointerType *MPT) const {
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return true;
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}
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/// Create a null member pointer of the given type.
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virtual llvm::Constant *EmitNullMemberPointer(const MemberPointerType *MPT);
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/// Create a member pointer for the given method.
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virtual llvm::Constant *EmitMemberFunctionPointer(const CXXMethodDecl *MD);
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/// Create a member pointer for the given field.
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virtual llvm::Constant *EmitMemberDataPointer(const MemberPointerType *MPT,
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CharUnits offset);
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/// Create a member pointer for the given member pointer constant.
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virtual llvm::Constant *EmitMemberPointer(const APValue &MP, QualType MPT);
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/// Emit a comparison between two member pointers. Returns an i1.
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virtual llvm::Value *
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EmitMemberPointerComparison(CodeGenFunction &CGF,
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llvm::Value *L,
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llvm::Value *R,
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const MemberPointerType *MPT,
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bool Inequality);
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/// Determine if a member pointer is non-null. Returns an i1.
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virtual llvm::Value *
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EmitMemberPointerIsNotNull(CodeGenFunction &CGF,
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llvm::Value *MemPtr,
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const MemberPointerType *MPT);
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protected:
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/// A utility method for computing the offset required for the given
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/// base-to-derived or derived-to-base member-pointer conversion.
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/// Does not handle virtual conversions (in case we ever fully
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/// support an ABI that allows this). Returns null if no adjustment
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/// is required.
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llvm::Constant *getMemberPointerAdjustment(const CastExpr *E);
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/// \brief Computes the non-virtual adjustment needed for a member pointer
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/// conversion along an inheritance path stored in an APValue. Unlike
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/// getMemberPointerAdjustment(), the adjustment can be negative if the path
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/// is from a derived type to a base type.
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CharUnits getMemberPointerPathAdjustment(const APValue &MP);
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public:
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virtual void emitVirtualObjectDelete(CodeGenFunction &CGF,
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const CXXDeleteExpr *DE,
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Address Ptr, QualType ElementType,
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const CXXDestructorDecl *Dtor) = 0;
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virtual void emitRethrow(CodeGenFunction &CGF, bool isNoReturn) = 0;
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virtual void emitThrow(CodeGenFunction &CGF, const CXXThrowExpr *E) = 0;
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virtual llvm::GlobalVariable *getThrowInfo(QualType T) { return nullptr; }
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/// \brief Determine whether it's possible to emit a vtable for \p RD, even
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/// though we do not know that the vtable has been marked as used by semantic
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/// analysis.
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virtual bool canSpeculativelyEmitVTable(const CXXRecordDecl *RD) const = 0;
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virtual void emitBeginCatch(CodeGenFunction &CGF, const CXXCatchStmt *C) = 0;
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virtual llvm::CallInst *
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emitTerminateForUnexpectedException(CodeGenFunction &CGF,
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llvm::Value *Exn);
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virtual llvm::Constant *getAddrOfRTTIDescriptor(QualType Ty) = 0;
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virtual CatchTypeInfo
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getAddrOfCXXCatchHandlerType(QualType Ty, QualType CatchHandlerType) = 0;
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virtual CatchTypeInfo getCatchAllTypeInfo();
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virtual bool shouldTypeidBeNullChecked(bool IsDeref,
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QualType SrcRecordTy) = 0;
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virtual void EmitBadTypeidCall(CodeGenFunction &CGF) = 0;
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virtual llvm::Value *EmitTypeid(CodeGenFunction &CGF, QualType SrcRecordTy,
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Address ThisPtr,
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llvm::Type *StdTypeInfoPtrTy) = 0;
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virtual bool shouldDynamicCastCallBeNullChecked(bool SrcIsPtr,
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QualType SrcRecordTy) = 0;
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virtual llvm::Value *
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EmitDynamicCastCall(CodeGenFunction &CGF, Address Value,
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QualType SrcRecordTy, QualType DestTy,
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QualType DestRecordTy, llvm::BasicBlock *CastEnd) = 0;
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virtual llvm::Value *EmitDynamicCastToVoid(CodeGenFunction &CGF,
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Address Value,
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QualType SrcRecordTy,
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QualType DestTy) = 0;
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virtual bool EmitBadCastCall(CodeGenFunction &CGF) = 0;
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virtual llvm::Value *GetVirtualBaseClassOffset(CodeGenFunction &CGF,
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Address This,
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const CXXRecordDecl *ClassDecl,
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const CXXRecordDecl *BaseClassDecl) = 0;
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virtual llvm::BasicBlock *EmitCtorCompleteObjectHandler(CodeGenFunction &CGF,
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const CXXRecordDecl *RD);
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/// Emit the code to initialize hidden members required
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/// to handle virtual inheritance, if needed by the ABI.
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virtual void
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initializeHiddenVirtualInheritanceMembers(CodeGenFunction &CGF,
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const CXXRecordDecl *RD) {}
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/// Emit constructor variants required by this ABI.
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virtual void EmitCXXConstructors(const CXXConstructorDecl *D) = 0;
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/// Build the signature of the given constructor or destructor variant by
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/// adding any required parameters. For convenience, ArgTys has been
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/// initialized with the type of 'this'.
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virtual void buildStructorSignature(const CXXMethodDecl *MD, StructorType T,
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SmallVectorImpl<CanQualType> &ArgTys) = 0;
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/// Returns true if the given destructor type should be emitted as a linkonce
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/// delegating thunk, regardless of whether the dtor is defined in this TU or
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/// not.
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virtual bool useThunkForDtorVariant(const CXXDestructorDecl *Dtor,
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CXXDtorType DT) const = 0;
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/// Emit destructor variants required by this ABI.
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virtual void EmitCXXDestructors(const CXXDestructorDecl *D) = 0;
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/// Get the type of the implicit "this" parameter used by a method. May return
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/// zero if no specific type is applicable, e.g. if the ABI expects the "this"
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/// parameter to point to some artificial offset in a complete object due to
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/// vbases being reordered.
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virtual const CXXRecordDecl *
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getThisArgumentTypeForMethod(const CXXMethodDecl *MD) {
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return MD->getParent();
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}
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/// Perform ABI-specific "this" argument adjustment required prior to
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/// a call of a virtual function.
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/// The "VirtualCall" argument is true iff the call itself is virtual.
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virtual Address
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adjustThisArgumentForVirtualFunctionCall(CodeGenFunction &CGF, GlobalDecl GD,
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Address This, bool VirtualCall) {
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return This;
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}
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/// Build a parameter variable suitable for 'this'.
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void buildThisParam(CodeGenFunction &CGF, FunctionArgList &Params);
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/// Insert any ABI-specific implicit parameters into the parameter list for a
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/// function. This generally involves extra data for constructors and
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/// destructors.
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///
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/// ABIs may also choose to override the return type, which has been
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/// initialized with the type of 'this' if HasThisReturn(CGF.CurGD) is true or
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/// the formal return type of the function otherwise.
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virtual void addImplicitStructorParams(CodeGenFunction &CGF, QualType &ResTy,
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FunctionArgList &Params) = 0;
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/// Get the ABI-specific "this" parameter adjustment to apply in the prologue
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/// of a virtual function.
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virtual CharUnits getVirtualFunctionPrologueThisAdjustment(GlobalDecl GD) {
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return CharUnits::Zero();
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}
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/// Perform ABI-specific "this" parameter adjustment in a virtual function
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/// prologue.
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virtual llvm::Value *adjustThisParameterInVirtualFunctionPrologue(
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CodeGenFunction &CGF, GlobalDecl GD, llvm::Value *This) {
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return This;
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}
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/// Emit the ABI-specific prolog for the function.
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virtual void EmitInstanceFunctionProlog(CodeGenFunction &CGF) = 0;
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/// Add any ABI-specific implicit arguments needed to call a constructor.
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///
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/// \return The number of args added to the call, which is typically zero or
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/// one.
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virtual unsigned
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addImplicitConstructorArgs(CodeGenFunction &CGF, const CXXConstructorDecl *D,
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CXXCtorType Type, bool ForVirtualBase,
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bool Delegating, CallArgList &Args) = 0;
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/// Emit the destructor call.
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virtual void EmitDestructorCall(CodeGenFunction &CGF,
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const CXXDestructorDecl *DD, CXXDtorType Type,
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bool ForVirtualBase, bool Delegating,
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Address This) = 0;
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/// Emits the VTable definitions required for the given record type.
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virtual void emitVTableDefinitions(CodeGenVTables &CGVT,
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const CXXRecordDecl *RD) = 0;
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/// Checks if ABI requires extra virtual offset for vtable field.
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virtual bool
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isVirtualOffsetNeededForVTableField(CodeGenFunction &CGF,
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CodeGenFunction::VPtr Vptr) = 0;
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/// Checks if ABI requires to initilize vptrs for given dynamic class.
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virtual bool doStructorsInitializeVPtrs(const CXXRecordDecl *VTableClass) = 0;
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/// Get the address point of the vtable for the given base subobject.
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virtual llvm::Constant *
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getVTableAddressPoint(BaseSubobject Base,
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const CXXRecordDecl *VTableClass) = 0;
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/// Get the address point of the vtable for the given base subobject while
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/// building a constructor or a destructor.
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virtual llvm::Value *
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getVTableAddressPointInStructor(CodeGenFunction &CGF, const CXXRecordDecl *RD,
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BaseSubobject Base,
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const CXXRecordDecl *NearestVBase) = 0;
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/// Get the address point of the vtable for the given base subobject while
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/// building a constexpr.
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virtual llvm::Constant *
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getVTableAddressPointForConstExpr(BaseSubobject Base,
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const CXXRecordDecl *VTableClass) = 0;
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/// Get the address of the vtable for the given record decl which should be
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/// used for the vptr at the given offset in RD.
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virtual llvm::GlobalVariable *getAddrOfVTable(const CXXRecordDecl *RD,
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CharUnits VPtrOffset) = 0;
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/// Build a virtual function pointer in the ABI-specific way.
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virtual llvm::Value *getVirtualFunctionPointer(CodeGenFunction &CGF,
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GlobalDecl GD,
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Address This,
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llvm::Type *Ty,
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SourceLocation Loc) = 0;
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/// Emit the ABI-specific virtual destructor call.
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virtual llvm::Value *
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EmitVirtualDestructorCall(CodeGenFunction &CGF, const CXXDestructorDecl *Dtor,
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CXXDtorType DtorType, Address This,
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const CXXMemberCallExpr *CE) = 0;
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virtual void adjustCallArgsForDestructorThunk(CodeGenFunction &CGF,
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GlobalDecl GD,
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CallArgList &CallArgs) {}
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/// Emit any tables needed to implement virtual inheritance. For Itanium,
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/// this emits virtual table tables. For the MSVC++ ABI, this emits virtual
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/// base tables.
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virtual void emitVirtualInheritanceTables(const CXXRecordDecl *RD) = 0;
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virtual void setThunkLinkage(llvm::Function *Thunk, bool ForVTable,
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GlobalDecl GD, bool ReturnAdjustment) = 0;
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virtual llvm::Value *performThisAdjustment(CodeGenFunction &CGF,
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Address This,
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const ThisAdjustment &TA) = 0;
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virtual llvm::Value *performReturnAdjustment(CodeGenFunction &CGF,
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Address Ret,
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const ReturnAdjustment &RA) = 0;
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virtual void EmitReturnFromThunk(CodeGenFunction &CGF,
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RValue RV, QualType ResultType);
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virtual size_t getSrcArgforCopyCtor(const CXXConstructorDecl *,
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FunctionArgList &Args) const = 0;
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/// Gets the offsets of all the virtual base pointers in a given class.
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virtual std::vector<CharUnits> getVBPtrOffsets(const CXXRecordDecl *RD);
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/// Gets the pure virtual member call function.
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virtual StringRef GetPureVirtualCallName() = 0;
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/// Gets the deleted virtual member call name.
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virtual StringRef GetDeletedVirtualCallName() = 0;
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/**************************** Array cookies ******************************/
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/// Returns the extra size required in order to store the array
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/// cookie for the given new-expression. May return 0 to indicate that no
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/// array cookie is required.
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///
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/// Several cases are filtered out before this method is called:
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/// - non-array allocations never need a cookie
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/// - calls to \::operator new(size_t, void*) never need a cookie
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///
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/// \param expr - the new-expression being allocated.
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virtual CharUnits GetArrayCookieSize(const CXXNewExpr *expr);
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/// Initialize the array cookie for the given allocation.
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///
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/// \param NewPtr - a char* which is the presumed-non-null
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/// return value of the allocation function
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/// \param NumElements - the computed number of elements,
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/// potentially collapsed from the multidimensional array case;
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/// always a size_t
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/// \param ElementType - the base element allocated type,
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/// i.e. the allocated type after stripping all array types
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virtual Address InitializeArrayCookie(CodeGenFunction &CGF,
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Address NewPtr,
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llvm::Value *NumElements,
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const CXXNewExpr *expr,
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QualType ElementType);
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/// Reads the array cookie associated with the given pointer,
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/// 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::Constant *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 = 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(const CXXMethodDecl *MD, StructorType Type) = 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);
|
|
|
|
}
|
|
}
|
|
|
|
#endif
|