1 //===-- SystemZMCExpr.h - SystemZ 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_SYSTEMZ_MCTARGETDESC_SYSTEMZMCEXPR_H 10 #define LLVM_LIB_TARGET_SYSTEMZ_MCTARGETDESC_SYSTEMZMCEXPR_H 11 12 #include "llvm/MC/MCExpr.h" 13 #include "llvm/MC/MCStreamer.h" 14 #include "llvm/MC/MCValue.h" 15 16 namespace llvm { 17 18 class SystemZMCExpr : public MCTargetExpr { 19 public: 20 // HLASM docs for address constants: 21 // https://www.ibm.com/docs/en/hla-and-tf/1.6?topic=value-address-constants 22 enum VariantKind { 23 VK_SystemZ_None, 24 VK_SystemZ_RCon, // Address of ADA of symbol. 25 VK_SystemZ_VCon, // Address of external function symbol. 26 }; 27 28 private: 29 const VariantKind Kind; 30 const MCExpr *Expr; 31 32 explicit SystemZMCExpr(VariantKind Kind, const MCExpr *Expr) 33 : Kind(Kind), Expr(Expr) {} 34 35 public: 36 static const SystemZMCExpr *create(VariantKind Kind, const MCExpr *Expr, 37 MCContext &Ctx); 38 39 /// getOpcode - Get the kind of this expression. 40 VariantKind getKind() const { return Kind; } 41 42 /// getSubExpr - Get the child of this expression. 43 const MCExpr *getSubExpr() const { return Expr; } 44 45 StringRef getVariantKindName() const; 46 47 void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override; 48 bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout, 49 const MCFixup *Fixup) const override; 50 void visitUsedExpr(MCStreamer &Streamer) const override { 51 Streamer.visitUsedExpr(*getSubExpr()); 52 } 53 MCFragment *findAssociatedFragment() const override { 54 return getSubExpr()->findAssociatedFragment(); 55 } 56 57 // There are no TLS SystemZMCExprs at the moment. 58 void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {} 59 60 static bool classof(const MCExpr *E) { 61 return E->getKind() == MCExpr::Target; 62 } 63 }; 64 } // end namespace llvm 65 66 #endif 67