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