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
24namespace llvm {
25
26class X86MCExpr : public MCTargetExpr {
27
28private:
29 const MCRegister Reg; // All
30
31 explicit X86MCExpr(MCRegister R) : Reg(R) {}
32
33public:
34 static const X86MCExpr *create(MCRegister Reg, MCContext &Ctx) {
35 return new (Ctx) X86MCExpr(Reg);
36 }
37
38 /// getSubExpr - Get the child of this expression.
39 MCRegister getReg() const { return Reg; }
40
41 void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override {
42 if (!MAI || MAI->getAssemblerDialect() == 0)
43 OS << '%';
44 OS << X86ATTInstPrinter::getRegisterName(Reg);
45 }
46
47 bool evaluateAsRelocatableImpl(MCValue &Res,
48 const MCAssembler *Asm) const override {
49 return false;
50 }
51 // Register values should be inlined as they are not valid .set expressions.
52 bool inlineAssignedExpr() const override { return true; }
53 bool isEqualTo(const MCExpr *X) const override {
54 if (auto *E = dyn_cast<X86MCExpr>(Val: X))
55 return getReg() == E->getReg();
56 return false;
57 }
58 void visitUsedExpr(MCStreamer &Streamer) const override {}
59 MCFragment *findAssociatedFragment() const override { return nullptr; }
60
61 static bool classof(const MCExpr *E) {
62 return E->getKind() == MCExpr::Target;
63 }
64};
65} // end namespace llvm
66
67#endif
68