lib/Target/RISCV/MCTargetDesc/RISCVMCExpr.h

   1 //===-- RISCVMCExpr.h - RISCV 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 // This file describes RISCV-specific MCExprs, used for modifiers like
  10 // "%hi" or "%lo" etc.,
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_LIB_TARGET_RISCV_MCTARGETDESC_RISCVMCEXPR_H
  15 #define LLVM_LIB_TARGET_RISCV_MCTARGETDESC_RISCVMCEXPR_H
  16
  17 #include "llvm/MC/MCExpr.h"
  18
  19 namespace llvm {
  20
  21 class StringRef;
  22 class MCOperand;
  23 class RISCVMCExpr : public MCTargetExpr {
  24 public:
  25   enum VariantKind {
  26     VK_RISCV_None,
  27     VK_RISCV_LO,
  28     VK_RISCV_HI,
  29     VK_RISCV_PCREL_LO,
  30     VK_RISCV_PCREL_HI,
  31     VK_RISCV_GOT_HI,
  32     VK_RISCV_TPREL_LO,
  33     VK_RISCV_TPREL_HI,
  34     VK_RISCV_TPREL_ADD,
  35     VK_RISCV_TLS_GOT_HI,
  36     VK_RISCV_TLS_GD_HI,
  37     VK_RISCV_CALL,
  38     VK_RISCV_CALL_PLT,
  39     VK_RISCV_Invalid
  40   };
  41
  42 private:
  43   const MCExpr *Expr;
  44   const VariantKind Kind;
  45
  46   int64_t evaluateAsInt64(int64_t Value) const;
  47
  48   bool evaluatePCRelLo(MCValue &Res, const MCAsmLayout *Layout,
  49                        const MCFixup *Fixup) const;
  50
  51   explicit RISCVMCExpr(const MCExpr *Expr, VariantKind Kind)
  52       : Expr(Expr), Kind(Kind) {}
  53
  54 public:
  55   static const RISCVMCExpr *create(const MCExpr *Expr, VariantKind Kind,
  56                                    MCContext &Ctx);
  57
  58   VariantKind getKind() const { return Kind; }
  59
  60   const MCExpr *getSubExpr() const { return Expr; }
  61
  62   /// Get the corresponding PC-relative HI fixup that a VK_RISCV_PCREL_LO
  63   /// points to.
  64   ///
  65   /// \returns nullptr if this isn't a VK_RISCV_PCREL_LO pointing to a
  66   /// known PC-relative HI fixup.
  67   const MCFixup *getPCRelHiFixup() const;
  68
  69   void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
  70   bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout,
  71                                  const MCFixup *Fixup) const override;
  72   void visitUsedExpr(MCStreamer &Streamer) const override;
  73   MCFragment *findAssociatedFragment() const override {
  74     return getSubExpr()->findAssociatedFragment();
  75   }
  76
  77   void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override;
  78
  79   bool evaluateAsConstant(int64_t &Res) const;
  80
  81   static bool classof(const MCExpr *E) {
  82     return E->getKind() == MCExpr::Target;
  83   }
  84
  85   static bool classof(const RISCVMCExpr *) { return true; }
  86
  87   static VariantKind getVariantKindForName(StringRef name);
  88   static StringRef getVariantKindName(VariantKind Kind);
  89 };
  90
  91 } // end namespace llvm.
  92
  93 #endif