lib/Target/PowerPC/MCTargetDesc/PPCMCExpr.h

   1 //===-- PPCMCExpr.h - PPC 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 LLVM_LIB_TARGET_POWERPC_MCTARGETDESC_PPCMCEXPR_H
  11 #define LLVM_LIB_TARGET_POWERPC_MCTARGETDESC_PPCMCEXPR_H
  12
  13 #include "llvm/MC/MCAsmLayout.h"
  14 #include "llvm/MC/MCExpr.h"
  15 #include "llvm/MC/MCValue.h"
  16
  17 namespace llvm {
  18
  19 class PPCMCExpr : public MCTargetExpr {
  20 public:
  21   enum VariantKind {
  22     VK_PPC_None,
  23     VK_PPC_LO,
  24     VK_PPC_HI,
  25     VK_PPC_HA,
  26     VK_PPC_HIGHER,
  27     VK_PPC_HIGHERA,
  28     VK_PPC_HIGHEST,
  29     VK_PPC_HIGHESTA
  30   };
  31
  32 private:
  33   const VariantKind Kind;
  34   const MCExpr *Expr;
  35   bool IsDarwin;
  36
  37   int64_t evaluateAsInt64(int64_t Value) const;
  38
  39   explicit PPCMCExpr(VariantKind Kind, const MCExpr *Expr, bool IsDarwin)
  40       : Kind(Kind), Expr(Expr), IsDarwin(IsDarwin) {}
  41
  42 public:
  43   /// @name Construction
  44   /// @{
  45
  46   static const PPCMCExpr *create(VariantKind Kind, const MCExpr *Expr,
  47                                  bool isDarwin, MCContext &Ctx);
  48
  49   static const PPCMCExpr *createLo(const MCExpr *Expr,
  50                                    bool isDarwin, MCContext &Ctx) {
  51     return create(VK_PPC_LO, Expr, isDarwin, Ctx);
  52   }
  53
  54   static const PPCMCExpr *createHi(const MCExpr *Expr,
  55                                    bool isDarwin, MCContext &Ctx) {
  56     return create(VK_PPC_HI, Expr, isDarwin, Ctx);
  57   }
  58
  59   static const PPCMCExpr *createHa(const MCExpr *Expr,
  60                                    bool isDarwin, MCContext &Ctx) {
  61     return create(VK_PPC_HA, Expr, isDarwin, Ctx);
  62   }
  63
  64   /// @}
  65   /// @name Accessors
  66   /// @{
  67
  68   /// getOpcode - Get the kind of this expression.
  69   VariantKind getKind() const { return Kind; }
  70
  71   /// getSubExpr - Get the child of this expression.
  72   const MCExpr *getSubExpr() const { return Expr; }
  73
  74   /// isDarwinSyntax - True if expression is to be printed using Darwin syntax.
  75   bool isDarwinSyntax() const { return IsDarwin; }
  76
  77
  78   /// @}
  79
  80   void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
  81   bool evaluateAsRelocatableImpl(MCValue &Res,
  82                                  const MCAsmLayout *Layout,
  83                                  const MCFixup *Fixup) const override;
  84   void visitUsedExpr(MCStreamer &Streamer) const override;
  85   MCFragment *findAssociatedFragment() const override {
  86     return getSubExpr()->findAssociatedFragment();
  87   }
  88
  89   // There are no TLS PPCMCExprs at the moment.
  90   void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
  91
  92   bool evaluateAsConstant(int64_t &Res) const;
  93
  94   static bool classof(const MCExpr *E) {
  95     return E->getKind() == MCExpr::Target;
  96   }
  97 };
  98 } // end namespace llvm
  99
 100 #endif