llvm/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/MCExpr.h"
  13 #include "llvm/MC/MCValue.h"
  14
  15 namespace llvm {
  16
  17 class PPCMCExpr : public MCTargetExpr {
  18 public:
  19   enum VariantKind {
  20     VK_PPC_None,
  21     VK_PPC_LO,
  22     VK_PPC_HI,
  23     VK_PPC_HA,
  24     VK_PPC_HIGH,
  25     VK_PPC_HIGHA,
  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
  36   int64_t evaluateAsInt64(int64_t Value) const;
  37
  38   explicit PPCMCExpr(VariantKind Kind, const MCExpr *Expr)
  39       : Kind(Kind), Expr(Expr) {}
  40
  41 public:
  42   /// @name Construction
  43   /// @{
  44
  45   static const PPCMCExpr *create(VariantKind Kind, const MCExpr *Expr,
  46                                  MCContext &Ctx);
  47
  48   static const PPCMCExpr *createLo(const MCExpr *Expr, MCContext &Ctx) {
  49     return create(VK_PPC_LO, Expr, Ctx);
  50   }
  51
  52   static const PPCMCExpr *createHi(const MCExpr *Expr, MCContext &Ctx) {
  53     return create(VK_PPC_HI, Expr, Ctx);
  54   }
  55
  56   static const PPCMCExpr *createHa(const MCExpr *Expr, MCContext &Ctx) {
  57     return create(VK_PPC_HA, Expr, Ctx);
  58   }
  59
  60   /// @}
  61   /// @name Accessors
  62   /// @{
  63
  64   /// getOpcode - Get the kind of this expression.
  65   VariantKind getKind() const { return Kind; }
  66
  67   /// getSubExpr - Get the child of this expression.
  68   const MCExpr *getSubExpr() const { return Expr; }
  69
  70   /// @}
  71
  72   void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
  73   bool evaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
  74                                  const MCFixup *Fixup) const override;
  75   void visitUsedExpr(MCStreamer &Streamer) const override;
  76   MCFragment *findAssociatedFragment() const override {
  77     return getSubExpr()->findAssociatedFragment();
  78   }
  79
  80   // There are no TLS PPCMCExprs at the moment.
  81   void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
  82
  83   bool evaluateAsConstant(int64_t &Res) const;
  84
  85   static bool classof(const MCExpr *E) {
  86     return E->getKind() == MCExpr::Target;
  87   }
  88 };
  89 } // end namespace llvm
  90
  91 #endif