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   bool IsDarwin;
37 
38   int64_t evaluateAsInt64(int64_t Value) const;
39 
40   explicit PPCMCExpr(VariantKind Kind, const MCExpr *Expr, bool IsDarwin)
41       : Kind(Kind), Expr(Expr), IsDarwin(IsDarwin) {}
42 
43 public:
44   /// @name Construction
45   /// @{
46 
47   static const PPCMCExpr *create(VariantKind Kind, const MCExpr *Expr,
48                                  bool isDarwin, MCContext &Ctx);
49 
50   static const PPCMCExpr *createLo(const MCExpr *Expr,
51                                    bool isDarwin, MCContext &Ctx) {
52     return create(VK_PPC_LO, Expr, isDarwin, Ctx);
53   }
54 
55   static const PPCMCExpr *createHi(const MCExpr *Expr,
56                                    bool isDarwin, MCContext &Ctx) {
57     return create(VK_PPC_HI, Expr, isDarwin, Ctx);
58   }
59 
60   static const PPCMCExpr *createHa(const MCExpr *Expr,
61                                    bool isDarwin, MCContext &Ctx) {
62     return create(VK_PPC_HA, Expr, isDarwin, Ctx);
63   }
64 
65   /// @}
66   /// @name Accessors
67   /// @{
68 
69   /// getOpcode - Get the kind of this expression.
70   VariantKind getKind() const { return Kind; }
71 
72   /// getSubExpr - Get the child of this expression.
73   const MCExpr *getSubExpr() const { return Expr; }
74 
75   /// isDarwinSyntax - True if expression is to be printed using Darwin syntax.
76   bool isDarwinSyntax() const { return IsDarwin; }
77 
78 
79   /// @}
80 
81   void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
82   bool evaluateAsRelocatableImpl(MCValue &Res,
83                                  const MCAsmLayout *Layout,
84                                  const MCFixup *Fixup) const override;
85   void visitUsedExpr(MCStreamer &Streamer) const override;
86   MCFragment *findAssociatedFragment() const override {
87     return getSubExpr()->findAssociatedFragment();
88   }
89 
90   // There are no TLS PPCMCExprs at the moment.
91   void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
92 
93   bool evaluateAsConstant(int64_t &Res) const;
94 
95   static bool classof(const MCExpr *E) {
96     return E->getKind() == MCExpr::Target;
97   }
98 };
99 } // end namespace llvm
100 
101 #endif
102