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[rustc.git] / src / llvm / lib / Target / ARM / MCTargetDesc / ARMMCExpr.h
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
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
39 static const ARMMCExpr *CreateUpper16(const MCExpr *Expr, MCContext &Ctx) {
40 return Create(VK_ARM_HI16, Expr, Ctx);
41 }
42
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.
52 VariantKind getKind() const { return Kind; }
53
54 /// getSubExpr - Get the child of this expression.
55 const MCExpr *getSubExpr() const { return Expr; }
56
57 /// @}
58
59 void PrintImpl(raw_ostream &OS) const override;
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;
66 const MCSection *FindAssociatedSection() const override {
67 return getSubExpr()->FindAssociatedSection();
68 }
69
70 // There are no TLS ARMMCExprs at the moment.
71 void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
72
73 static bool classof(const MCExpr *E) {
74 return E->getKind() == MCExpr::Target;
75 }
76 };
77 } // end namespace llvm
78
79 #endif