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//===----- CGCXXABI.h - Interface to C++ ABIs -------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This provides an abstract class for C++ code generation. Concrete subclasses
// of this implement code generation for specific C++ ABIs.
//
//===----------------------------------------------------------------------===//
#ifndef CLANG_CODEGEN_CXXABI_H
#define CLANG_CODEGEN_CXXABI_H
namespace llvm {
class Constant;
class Type;
class Value;
}
namespace clang {
class CastExpr;
class CXXMethodDecl;
class CXXRecordDecl;
class FieldDecl;
class MemberPointerType;
class QualType;
namespace CodeGen {
class CodeGenFunction;
class CodeGenModule;
class MangleContext;
/// Implements C++ ABI-specific code generation functions.
class CGCXXABI {
protected:
CodeGenModule &CGM;
CGCXXABI(CodeGenModule &CGM) : CGM(CGM) {}
public:
virtual ~CGCXXABI();
/// Gets the mangle context.
virtual MangleContext &getMangleContext() = 0;
/// Find the LLVM type used to represent the given member pointer
/// type.
virtual const 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 llvm::Value *
EmitLoadOfMemberFunctionPointer(CodeGenFunction &CGF,
llvm::Value *&This,
llvm::Value *MemPtr,
const MemberPointerType *MPT);
/// Perform a derived-to-base or base-to-derived member pointer
/// conversion.
virtual llvm::Value *EmitMemberPointerConversion(CodeGenFunction &CGF,
const CastExpr *E,
llvm::Value *Src);
/// Perform a derived-to-base or base-to-derived member pointer
/// conversion on a constant member pointer.
virtual llvm::Constant *EmitMemberPointerConversion(llvm::Constant *C,
const CastExpr *E);
/// 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);
/// 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 *EmitMemberPointer(const CXXMethodDecl *MD);
/// Create a member pointer for the given field.
virtual llvm::Constant *EmitMemberPointer(const FieldDecl *FD);
/// 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);
};
/// Creates an instance of a C++ ABI class.
CGCXXABI *CreateARMCXXABI(CodeGenModule &CGM);
CGCXXABI *CreateItaniumCXXABI(CodeGenModule &CGM);
CGCXXABI *CreateMicrosoftCXXABI(CodeGenModule &CGM);
}
}
#endif
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