1 //===-- ARMMCExpr.h - ARM specific MC expression classes --------*- C++ -*-===//
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
7 //===----------------------------------------------------------------------===//
9 #ifndef LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMMCEXPR_H
10 #define LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMMCEXPR_H
12 #include "llvm/MC/MCExpr.h"
16 class ARMMCExpr : public MCTargetExpr {
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)
25 const VariantKind Kind;
28 explicit ARMMCExpr(VariantKind Kind, const MCExpr *Expr)
29 : Kind(Kind), Expr(Expr) {}
32 /// @name Construction
35 static const ARMMCExpr *create(VariantKind Kind, const MCExpr *Expr,
38 static const ARMMCExpr *createUpper16(const MCExpr *Expr, MCContext &Ctx) {
39 return create(VK_ARM_HI16, Expr, Ctx);
42 static const ARMMCExpr *createLower16(const MCExpr *Expr, MCContext &Ctx) {
43 return create(VK_ARM_LO16, Expr, Ctx);
50 /// getOpcode - Get the kind of this expression.
51 VariantKind getKind() const { return Kind; }
53 /// getSubExpr - Get the child of this expression.
54 const MCExpr *getSubExpr() const { return Expr; }
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 {
64 void visitUsedExpr(MCStreamer &Streamer) const override;
65 MCFragment *findAssociatedFragment() const override {
66 return getSubExpr()->findAssociatedFragment();
69 // There are no TLS ARMMCExprs at the moment.
70 void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
72 static bool classof(const MCExpr *E) {
73 return E->getKind() == MCExpr::Target;
76 } // end namespace llvm