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 int64_t RegNo; // All
30
31 explicit X86MCExpr(int64_t R) : RegNo(R) {}
32
33public:
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(Reg: RegNo);
54 }
55
56 bool evaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
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>(Val: 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