1//===-- ARMMCExpr.h - ARM specific MC expression classes --------*- 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#ifndef ARMMCEXPR_H 11#define ARMMCEXPR_H 12 13#include "llvm/MC/MCExpr.h" 14 15namespace llvm { 16 17class ARMMCExpr : public MCTargetExpr { 18public: 19 enum VariantKind { 20 VK_ARM_None, 21 VK_ARM_HI16, // The R_ARM_MOVT_ABS relocation (:upper16: in the .s file) 22 VK_ARM_LO16 // The R_ARM_MOVW_ABS_NC relocation (:lower16: in the .s file) 23 }; 24 25private: 26 const VariantKind Kind; 27 const MCExpr *Expr; 28 29 explicit ARMMCExpr(VariantKind _Kind, const MCExpr *_Expr) 30 : Kind(_Kind), Expr(_Expr) {} 31 32public: 33 /// @name Construction 34 /// @{ 35 36 static const ARMMCExpr *Create(VariantKind Kind, const MCExpr *Expr, 37 MCContext &Ctx); 38 39 static const ARMMCExpr *CreateUpper16(const MCExpr *Expr, MCContext &Ctx) { 40 return Create(VK_ARM_HI16, Expr, Ctx); 41 } 42 43 static const ARMMCExpr *CreateLower16(const MCExpr *Expr, MCContext &Ctx) { 44 return Create(VK_ARM_LO16, Expr, Ctx); 45 } 46 47 /// @} 48 /// @name Accessors 49 /// @{ 50 51 /// getOpcode - Get the kind of this expression. 52 VariantKind getKind() const { return Kind; } 53 54 /// getSubExpr - Get the child of this expression. 55 const MCExpr *getSubExpr() const { return Expr; } 56 57 /// @} 58 59 void PrintImpl(raw_ostream &OS) const; 60 bool EvaluateAsRelocatableImpl(MCValue &Res, 61 const MCAsmLayout *Layout) const; 62 void AddValueSymbols(MCAssembler *) const; 63 const MCSection *FindAssociatedSection() const { 64 return getSubExpr()->FindAssociatedSection(); 65 } 66 67 // There are no TLS ARMMCExprs at the moment. 68 void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {} 69 70 static bool classof(const MCExpr *E) { 71 return E->getKind() == MCExpr::Target; 72 } 73}; 74} // end namespace llvm 75 76#endif 77