1 //===-- RISCVMCExpr.h - RISCV 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 // This file describes RISCV-specific MCExprs, used for modifiers like 11 // "%hi" or "%lo" etc., 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_LIB_TARGET_RISCV_MCTARGETDESC_RISCVMCEXPR_H 16 #define LLVM_LIB_TARGET_RISCV_MCTARGETDESC_RISCVMCEXPR_H 17 18 #include "llvm/MC/MCExpr.h" 19 20 namespace llvm { 21 22 class StringRef; 23 class MCOperand; 24 class RISCVMCExpr : public MCTargetExpr { 25 public: 26 enum VariantKind { 27 VK_RISCV_None, 28 VK_RISCV_LO, 29 VK_RISCV_HI, 30 VK_RISCV_PCREL_LO, 31 VK_RISCV_PCREL_HI, 32 VK_RISCV_CALL, 33 VK_RISCV_Invalid 34 }; 35 36 private: 37 const MCExpr *Expr; 38 const VariantKind Kind; 39 40 int64_t evaluateAsInt64(int64_t Value) const; 41 RISCVMCExpr(const MCExpr * Expr,VariantKind Kind)42 explicit RISCVMCExpr(const MCExpr *Expr, VariantKind Kind) 43 : Expr(Expr), Kind(Kind) {} 44 45 public: 46 static const RISCVMCExpr *create(const MCExpr *Expr, VariantKind Kind, 47 MCContext &Ctx); 48 getKind()49 VariantKind getKind() const { return Kind; } 50 getSubExpr()51 const MCExpr *getSubExpr() const { return Expr; } 52 53 void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override; 54 bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout, 55 const MCFixup *Fixup) const override; 56 void visitUsedExpr(MCStreamer &Streamer) const override; findAssociatedFragment()57 MCFragment *findAssociatedFragment() const override { 58 return getSubExpr()->findAssociatedFragment(); 59 } 60 61 // There are no TLS RISCVMCExprs at the moment. fixELFSymbolsInTLSFixups(MCAssembler & Asm)62 void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {} 63 64 bool evaluateAsConstant(int64_t &Res) const; 65 classof(const MCExpr * E)66 static bool classof(const MCExpr *E) { 67 return E->getKind() == MCExpr::Target; 68 } 69 classof(const RISCVMCExpr *)70 static bool classof(const RISCVMCExpr *) { return true; } 71 72 static VariantKind getVariantKindForName(StringRef name); 73 static StringRef getVariantKindName(VariantKind Kind); 74 }; 75 76 } // end namespace llvm. 77 78 #endif 79