1 //===-- PPCMCExpr.h - PPC 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_POWERPC_MCTARGETDESC_PPCMCEXPR_H
10 #define LLVM_LIB_TARGET_POWERPC_MCTARGETDESC_PPCMCEXPR_H
11 
12 #include "llvm/MC/MCAsmLayout.h"
13 #include "llvm/MC/MCExpr.h"
14 #include "llvm/MC/MCValue.h"
15 
16 namespace llvm {
17 
18 class PPCMCExpr : public MCTargetExpr {
19 public:
20   enum VariantKind {
21     VK_PPC_None,
22     VK_PPC_LO,
23     VK_PPC_HI,
24     VK_PPC_HA,
25     VK_PPC_HIGH,
26     VK_PPC_HIGHA,
27     VK_PPC_HIGHER,
28     VK_PPC_HIGHERA,
29     VK_PPC_HIGHEST,
30     VK_PPC_HIGHESTA
31   };
32 
33 private:
34   const VariantKind Kind;
35   const MCExpr *Expr;
36 
37   int64_t evaluateAsInt64(int64_t Value) const;
38 
39   explicit PPCMCExpr(VariantKind Kind, const MCExpr *Expr)
40       : Kind(Kind), Expr(Expr) {}
41 
42 public:
43   /// @name Construction
44   /// @{
45 
46   static const PPCMCExpr *create(VariantKind Kind, const MCExpr *Expr,
47                                  MCContext &Ctx);
48 
49   static const PPCMCExpr *createLo(const MCExpr *Expr, MCContext &Ctx) {
50     return create(VK_PPC_LO, Expr, Ctx);
51   }
52 
53   static const PPCMCExpr *createHi(const MCExpr *Expr, MCContext &Ctx) {
54     return create(VK_PPC_HI, Expr, Ctx);
55   }
56 
57   static const PPCMCExpr *createHa(const MCExpr *Expr, MCContext &Ctx) {
58     return create(VK_PPC_HA, Expr, Ctx);
59   }
60 
61   /// @}
62   /// @name Accessors
63   /// @{
64 
65   /// getOpcode - Get the kind of this expression.
66   VariantKind getKind() const { return Kind; }
67 
68   /// getSubExpr - Get the child of this expression.
69   const MCExpr *getSubExpr() const { return Expr; }
70 
71   /// @}
72 
73   void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
74   bool evaluateAsRelocatableImpl(MCValue &Res,
75                                  const MCAsmLayout *Layout,
76                                  const MCFixup *Fixup) const override;
77   void visitUsedExpr(MCStreamer &Streamer) const override;
78   MCFragment *findAssociatedFragment() const override {
79     return getSubExpr()->findAssociatedFragment();
80   }
81 
82   // There are no TLS PPCMCExprs at the moment.
83   void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
84 
85   bool evaluateAsConstant(int64_t &Res) const;
86 
87   static bool classof(const MCExpr *E) {
88     return E->getKind() == MCExpr::Target;
89   }
90 };
91 } // end namespace llvm
92 
93 #endif
94