lib/Target/PowerPC/MCTargetDesc/PPCMCExpr.h

   1 //===-- PPCMCExpr.h - PPC specific MC expression classes --------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLVM_LIB_TARGET_POWERPC_MCTARGETDESC_PPCMCEXPR_H
  10 #define LLVM_LIB_TARGET_POWERPC_MCTARGETDESC_PPCMCEXPR_H
  11
  12 #include "llvm/MC/MCAsmLayout.h"
  13 #include "llvm/MC/MCExpr.h"
  14 #include "llvm/MC/MCValue.h"
  15
  16 namespace llvm {
  17
  18 class PPCMCExpr : public MCTargetExpr {
  19 public:
  20   enum VariantKind {
  21     VK_PPC_None,
  22     VK_PPC_LO,
  23     VK_PPC_HI,
  24     VK_PPC_HA,
  25     VK_PPC_HIGH,
  26     VK_PPC_HIGHA,
  27     VK_PPC_HIGHER,
  28     VK_PPC_HIGHERA,
  29     VK_PPC_HIGHEST,
  30     VK_PPC_HIGHESTA
  31   };
  32
  33 private:
  34   const VariantKind Kind;
  35   const MCExpr *Expr;
  36   bool IsDarwin;
  37
  38   int64_t evaluateAsInt64(int64_t Value) const;
  39
  40   explicit PPCMCExpr(VariantKind Kind, const MCExpr *Expr, bool IsDarwin)
  41       : Kind(Kind), Expr(Expr), IsDarwin(IsDarwin) {}
  42
  43 public:
  44   /// @name Construction
  45   /// @{
  46
  47   static const PPCMCExpr *create(VariantKind Kind, const MCExpr *Expr,
  48                                  bool IsDarwin, MCContext &Ctx);
  49
  50   static const PPCMCExpr *createLo(const MCExpr *Expr,
  51                                    bool IsDarwin, MCContext &Ctx) {
  52     return create(VK_PPC_LO, Expr, IsDarwin, Ctx);
  53   }
  54
  55   static const PPCMCExpr *createHi(const MCExpr *Expr,
  56                                    bool IsDarwin, MCContext &Ctx) {
  57     return create(VK_PPC_HI, Expr, IsDarwin, Ctx);
  58   }
  59
  60   static const PPCMCExpr *createHa(const MCExpr *Expr,
  61                                    bool IsDarwin, MCContext &Ctx) {
  62     return create(VK_PPC_HA, Expr, IsDarwin, Ctx);
  63   }
  64
  65   /// @}
  66   /// @name Accessors
  67   /// @{
  68
  69   /// getOpcode - Get the kind of this expression.
  70   VariantKind getKind() const { return Kind; }
  71
  72   /// getSubExpr - Get the child of this expression.
  73   const MCExpr *getSubExpr() const { return Expr; }
  74
  75   /// isDarwinSyntax - True if expression is to be printed using Darwin syntax.
  76   bool isDarwinSyntax() const { return IsDarwin; }
  77
  78
  79   /// @}
  80
  81   void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
  82   bool evaluateAsRelocatableImpl(MCValue &Res,
  83                                  const MCAsmLayout *Layout,
  84                                  const MCFixup *Fixup) const override;
  85   void visitUsedExpr(MCStreamer &Streamer) const override;
  86   MCFragment *findAssociatedFragment() const override {
  87     return getSubExpr()->findAssociatedFragment();
  88   }
  89
  90   // There are no TLS PPCMCExprs at the moment.
  91   void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
  92
  93   bool evaluateAsConstant(int64_t &Res) const;
  94
  95   static bool classof(const MCExpr *E) {
  96     return E->getKind() == MCExpr::Target;
  97   }
  98 };
  99 } // end namespace llvm
 100
 101 #endif