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(Kind: VK_ARM_HI16, Expr, Ctx);
49 }
50
51 static const ARMMCExpr *createLower16(const MCExpr *Expr, MCContext &Ctx) {
52 return create(Kind: VK_ARM_LO16, Expr, Ctx);
53 }
54
55 static const ARMMCExpr *createUpper8_15(const MCExpr *Expr, MCContext &Ctx) {
56 return create(Kind: VK_ARM_HI_8_15, Expr, Ctx);
57 }
58
59 static const ARMMCExpr *createUpper0_7(const MCExpr *Expr, MCContext &Ctx) {
60 return create(Kind: VK_ARM_HI_0_7, Expr, Ctx);
61 }
62
63 static const ARMMCExpr *createLower8_15(const MCExpr *Expr, MCContext &Ctx) {
64 return create(Kind: VK_ARM_LO_8_15, Expr, Ctx);
65 }
66
67 static const ARMMCExpr *createLower0_7(const MCExpr *Expr, MCContext &Ctx) {
68 return create(Kind: 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, const MCAssembler *Asm,
85 const MCFixup *Fixup) const override {
86 return false;
87 }
88 void visitUsedExpr(MCStreamer &Streamer) const override;
89 MCFragment *findAssociatedFragment() const override {
90 return getSubExpr()->findAssociatedFragment();
91 }
92
93 // There are no TLS ARMMCExprs at the moment.
94 void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
95
96 static bool classof(const MCExpr *E) {
97 return E->getKind() == MCExpr::Target;
98 }
99};
100} // end namespace llvm
101
102#endif
103