1//===-- ARMMCExpr.h - ARM 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#ifndef LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMMCEXPR_H
10#define LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMMCEXPR_H
11
12#include "llvm/MC/MCExpr.h"
13
14namespace llvm {
15
16class ARMMCExpr : public MCTargetExpr {
17public:
18  enum VariantKind {
19    VK_ARM_None,
20    VK_ARM_HI16,  // The R_ARM_MOVT_ABS relocation (:upper16: in the .s file)
21    VK_ARM_LO16   // The R_ARM_MOVW_ABS_NC relocation (:lower16: in the .s file)
22  };
23
24private:
25  const VariantKind Kind;
26  const MCExpr *Expr;
27
28  explicit ARMMCExpr(VariantKind Kind, const MCExpr *Expr)
29      : Kind(Kind), Expr(Expr) {}
30
31public:
32  /// @name Construction
33  /// @{
34
35  static const ARMMCExpr *create(VariantKind Kind, const MCExpr *Expr,
36                                      MCContext &Ctx);
37
38  static const ARMMCExpr *createUpper16(const MCExpr *Expr, MCContext &Ctx) {
39    return create(VK_ARM_HI16, Expr, Ctx);
40  }
41
42  static const ARMMCExpr *createLower16(const MCExpr *Expr, MCContext &Ctx) {
43    return create(VK_ARM_LO16, Expr, Ctx);
44  }
45
46  /// @}
47  /// @name Accessors
48  /// @{
49
50  /// getOpcode - Get the kind of this expression.
51  VariantKind getKind() const { return Kind; }
52
53  /// getSubExpr - Get the child of this expression.
54  const MCExpr *getSubExpr() const { return Expr; }
55
56  /// @}
57
58  void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
59  bool evaluateAsRelocatableImpl(MCValue &Res,
60                                 const MCAsmLayout *Layout,
61                                 const MCFixup *Fixup) const override {
62    return false;
63  }
64  void visitUsedExpr(MCStreamer &Streamer) const override;
65  MCFragment *findAssociatedFragment() const override {
66    return getSubExpr()->findAssociatedFragment();
67  }
68
69  // There are no TLS ARMMCExprs 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} // end namespace llvm
77
78#endif
79