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1 //===-- ARMMCExpr.h - ARM specific MC expression classes --------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #ifndef LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMMCEXPR_H
11 #define LLVM_LIB_TARGET_ARM_MCTARGETDESC_ARMMCEXPR_H
12 
13 #include "llvm/MC/MCExpr.h"
14 
15 namespace llvm {
16 
17 class ARMMCExpr : public MCTargetExpr {
18 public:
19   enum VariantKind {
20     VK_ARM_None,
21     VK_ARM_HI16,  // The R_ARM_MOVT_ABS relocation (:upper16: in the .s file)
22     VK_ARM_LO16   // The R_ARM_MOVW_ABS_NC relocation (:lower16: in the .s file)
23   };
24 
25 private:
26   const VariantKind Kind;
27   const MCExpr *Expr;
28 
ARMMCExpr(VariantKind Kind,const MCExpr * Expr)29   explicit ARMMCExpr(VariantKind Kind, const MCExpr *Expr)
30       : Kind(Kind), Expr(Expr) {}
31 
32 public:
33   /// @name Construction
34   /// @{
35 
36   static const ARMMCExpr *create(VariantKind Kind, const MCExpr *Expr,
37                                       MCContext &Ctx);
38 
createUpper16(const MCExpr * Expr,MCContext & Ctx)39   static const ARMMCExpr *createUpper16(const MCExpr *Expr, MCContext &Ctx) {
40     return create(VK_ARM_HI16, Expr, Ctx);
41   }
42 
createLower16(const MCExpr * Expr,MCContext & Ctx)43   static const ARMMCExpr *createLower16(const MCExpr *Expr, MCContext &Ctx) {
44     return create(VK_ARM_LO16, Expr, Ctx);
45   }
46 
47   /// @}
48   /// @name Accessors
49   /// @{
50 
51   /// getOpcode - Get the kind of this expression.
getKind()52   VariantKind getKind() const { return Kind; }
53 
54   /// getSubExpr - Get the child of this expression.
getSubExpr()55   const MCExpr *getSubExpr() const { return Expr; }
56 
57   /// @}
58 
59   void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
evaluateAsRelocatableImpl(MCValue & Res,const MCAsmLayout * Layout,const MCFixup * Fixup)60   bool evaluateAsRelocatableImpl(MCValue &Res,
61                                  const MCAsmLayout *Layout,
62                                  const MCFixup *Fixup) const override {
63     return false;
64   }
65   void visitUsedExpr(MCStreamer &Streamer) const override;
findAssociatedFragment()66   MCFragment *findAssociatedFragment() const override {
67     return getSubExpr()->findAssociatedFragment();
68   }
69 
70   // There are no TLS ARMMCExprs at the moment.
fixELFSymbolsInTLSFixups(MCAssembler & Asm)71   void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
72 
classof(const MCExpr * E)73   static bool classof(const MCExpr *E) {
74     return E->getKind() == MCExpr::Target;
75   }
76 };
77 } // end namespace llvm
78 
79 #endif
80