1 //=--- X86MCExpr.h - X86 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 X86-specific MCExprs, i.e, registers used for 10 // extended variable assignments. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_TARGET_X86_MCTARGETDESC_X86MCEXPR_H 15 #define LLVM_LIB_TARGET_X86_MCTARGETDESC_X86MCEXPR_H 16 17 #include "X86ATTInstPrinter.h" 18 #include "llvm/MC/MCAsmInfo.h" 19 #include "llvm/MC/MCContext.h" 20 #include "llvm/MC/MCExpr.h" 21 #include "llvm/Support/Casting.h" 22 #include "llvm/Support/ErrorHandling.h" 23 24 namespace llvm { 25 26 class X86MCExpr : public MCTargetExpr { 27 28 private: 29 const int64_t RegNo; // All 30 31 explicit X86MCExpr(int64_t R) : RegNo(R) {} 32 33 public: 34 /// @name Construction 35 /// @{ 36 37 static const X86MCExpr *create(int64_t RegNo, MCContext &Ctx) { 38 return new (Ctx) X86MCExpr(RegNo); 39 } 40 41 /// @} 42 /// @name Accessors 43 /// @{ 44 45 /// getSubExpr - Get the child of this expression. 46 int64_t getRegNo() const { return RegNo; } 47 48 /// @} 49 50 void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override { 51 if (!MAI || MAI->getAssemblerDialect() == 0) 52 OS << '%'; 53 OS << X86ATTInstPrinter::getRegisterName(RegNo); 54 } 55 56 bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout, 57 const MCFixup *Fixup) const override { 58 return false; 59 } 60 // Register values should be inlined as they are not valid .set expressions. 61 bool inlineAssignedExpr() const override { return true; } 62 bool isEqualTo(const MCExpr *X) const override { 63 if (auto *E = dyn_cast<X86MCExpr>(X)) 64 return getRegNo() == E->getRegNo(); 65 return false; 66 } 67 void visitUsedExpr(MCStreamer &Streamer) const override {} 68 MCFragment *findAssociatedFragment() const override { return nullptr; } 69 70 // There are no TLS X86MCExprs at the moment. 71 void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {} 72 73 static bool classof(const MCExpr *E) { 74 return E->getKind() == MCExpr::Target; 75 } 76 }; 77 78 } // end namespace llvm 79 80 #endif 81