1 //===-- ARMMCExpr.h - ARM specific MC expression classes ------------------===// 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 15 namespace llvm { 16 17 class ARMMCExpr : public MCTargetExpr { 18 public: 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 25 private: 26 const VariantKind Kind; 27 const MCExpr *Expr; 28 29 explicit ARMMCExpr(VariantKind _Kind, const MCExpr *_Expr) 30 : Kind(_Kind), Expr(_Expr) {} 31 32 public: 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 static bool classof(const MCExpr *E) { 68 return E->getKind() == MCExpr::Target; 69 } 70 71 static bool classof(const ARMMCExpr *) { return true; } 72 73 }; 74 } // end namespace llvm 75 76 #endif 77
