1 //=--- X86MCExpr.h - X86 specific MC expression classes ---*- C++ -*-=//
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
7 //===----------------------------------------------------------------------===//
9 // This file describes X86-specific MCExprs, i.e, registers used for
10 // extended variable assignments.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_LIB_TARGET_X86_MCTARGETDESC_X86MCEXPR_H
15 #define LLVM_LIB_TARGET_X86_MCTARGETDESC_X86MCEXPR_H
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"
25 class X86MCExpr : public MCTargetExpr {
28 const int64_t RegNo; // All
30 explicit X86MCExpr(int64_t R) : RegNo(R) {}
33 /// @name Construction
36 static const X86MCExpr *create(int64_t RegNo, MCContext &Ctx) {
37 return new (Ctx) X86MCExpr(RegNo);
44 /// getSubExpr - Get the child of this expression.
45 int64_t getRegNo() const { return RegNo; }
49 void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override {
50 if (!MAI || MAI->getAssemblerDialect() == 0)
52 OS << X86ATTInstPrinter::getRegisterName(RegNo);
55 bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout,
56 const MCFixup *Fixup) const override {
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();
66 void visitUsedExpr(MCStreamer &Streamer) const override{};
67 MCFragment *findAssociatedFragment() const override { return nullptr; }
69 // There are no TLS X86MCExprs at the moment.
70 void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
72 static bool classof(const MCExpr *E) {
73 return E->getKind() == MCExpr::Target;
77 } // end namespace llvm