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    VK_ARM_HI_8_15, // The R_ARM_THM_ALU_ABS_G3    relocation (:upper8_15: in
24                    // the .s file)
25    VK_ARM_HI_0_7,  // The R_ARM_THM_ALU_ABS_G2_NC relocation (:upper0_8: in the
26                    // .s file)
27    VK_ARM_LO_8_15, // The R_ARM_THM_ALU_ABS_G1_NC relocation (:lower8_15: in
28                    // the .s file)
29    VK_ARM_LO_0_7,  // The R_ARM_THM_ALU_ABS_G0_NC relocation (:lower0_7: in the
30                    // .s file)
31  };
32
33private:
34  const VariantKind Kind;
35  const MCExpr *Expr;
36
37  explicit ARMMCExpr(VariantKind Kind, const MCExpr *Expr)
38      : Kind(Kind), Expr(Expr) {}
39
40public:
41  /// @name Construction
42  /// @{
43
44  static const ARMMCExpr *create(VariantKind Kind, const MCExpr *Expr,
45                                      MCContext &Ctx);
46
47  static const ARMMCExpr *createUpper16(const MCExpr *Expr, MCContext &Ctx) {
48    return create(VK_ARM_HI16, Expr, Ctx);
49  }
50
51  static const ARMMCExpr *createLower16(const MCExpr *Expr, MCContext &Ctx) {
52    return create(VK_ARM_LO16, Expr, Ctx);
53  }
54
55  static const ARMMCExpr *createUpper8_15(const MCExpr *Expr, MCContext &Ctx) {
56    return create(VK_ARM_HI_8_15, Expr, Ctx);
57  }
58
59  static const ARMMCExpr *createUpper0_7(const MCExpr *Expr, MCContext &Ctx) {
60    return create(VK_ARM_HI_0_7, Expr, Ctx);
61  }
62
63  static const ARMMCExpr *createLower8_15(const MCExpr *Expr, MCContext &Ctx) {
64    return create(VK_ARM_LO_8_15, Expr, Ctx);
65  }
66
67  static const ARMMCExpr *createLower0_7(const MCExpr *Expr, MCContext &Ctx) {
68    return create(VK_ARM_LO_0_7, Expr, Ctx);
69  }
70
71  /// @}
72  /// @name Accessors
73  /// @{
74
75  /// getOpcode - Get the kind of this expression.
76  VariantKind getKind() const { return Kind; }
77
78  /// getSubExpr - Get the child of this expression.
79  const MCExpr *getSubExpr() const { return Expr; }
80
81  /// @}
82
83  void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
84  bool evaluateAsRelocatableImpl(MCValue &Res,
85                                 const MCAsmLayout *Layout,
86                                 const MCFixup *Fixup) const override {
87    return false;
88  }
89  void visitUsedExpr(MCStreamer &Streamer) const override;
90  MCFragment *findAssociatedFragment() const override {
91    return getSubExpr()->findAssociatedFragment();
92  }
93
94  // There are no TLS ARMMCExprs at the moment.
95  void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
96
97  static bool classof(const MCExpr *E) {
98    return E->getKind() == MCExpr::Target;
99  }
100};
101} // end namespace llvm
102
103#endif
104