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      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 
     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   // 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