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      1 //==- AArch64MCExpr.h - AArch64 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 // This file describes AArch64-specific MCExprs, used for modifiers like
     11 // ":lo12:" or ":gottprel_g1:".
     12 //
     13 //===----------------------------------------------------------------------===//
     14 
     15 #ifndef LLVM_AARCH64MCEXPR_H
     16 #define LLVM_AARCH64MCEXPR_H
     17 
     18 #include "llvm/MC/MCExpr.h"
     19 
     20 namespace llvm {
     21 
     22 class AArch64MCExpr : public MCTargetExpr {
     23 public:
     24   enum VariantKind {
     25     VK_AARCH64_None,
     26     VK_AARCH64_GOT,      // :got: modifier in assembly
     27     VK_AARCH64_GOT_LO12, // :got_lo12:
     28     VK_AARCH64_LO12,     // :lo12:
     29 
     30     VK_AARCH64_ABS_G0, // :abs_g0:
     31     VK_AARCH64_ABS_G0_NC, // :abs_g0_nc:
     32     VK_AARCH64_ABS_G1,
     33     VK_AARCH64_ABS_G1_NC,
     34     VK_AARCH64_ABS_G2,
     35     VK_AARCH64_ABS_G2_NC,
     36     VK_AARCH64_ABS_G3,
     37 
     38     VK_AARCH64_SABS_G0, // :abs_g0_s:
     39     VK_AARCH64_SABS_G1,
     40     VK_AARCH64_SABS_G2,
     41 
     42     VK_AARCH64_DTPREL_G2, // :dtprel_g2:
     43     VK_AARCH64_DTPREL_G1,
     44     VK_AARCH64_DTPREL_G1_NC,
     45     VK_AARCH64_DTPREL_G0,
     46     VK_AARCH64_DTPREL_G0_NC,
     47     VK_AARCH64_DTPREL_HI12,
     48     VK_AARCH64_DTPREL_LO12,
     49     VK_AARCH64_DTPREL_LO12_NC,
     50 
     51     VK_AARCH64_GOTTPREL_G1, // :gottprel:
     52     VK_AARCH64_GOTTPREL_G0_NC,
     53     VK_AARCH64_GOTTPREL,
     54     VK_AARCH64_GOTTPREL_LO12,
     55 
     56     VK_AARCH64_TPREL_G2, // :tprel:
     57     VK_AARCH64_TPREL_G1,
     58     VK_AARCH64_TPREL_G1_NC,
     59     VK_AARCH64_TPREL_G0,
     60     VK_AARCH64_TPREL_G0_NC,
     61     VK_AARCH64_TPREL_HI12,
     62     VK_AARCH64_TPREL_LO12,
     63     VK_AARCH64_TPREL_LO12_NC,
     64 
     65     VK_AARCH64_TLSDESC, // :tlsdesc:
     66     VK_AARCH64_TLSDESC_LO12
     67   };
     68 
     69 private:
     70   const VariantKind Kind;
     71   const MCExpr *Expr;
     72 
     73   explicit AArch64MCExpr(VariantKind _Kind, const MCExpr *_Expr)
     74     : Kind(_Kind), Expr(_Expr) {}
     75 
     76 public:
     77   /// @name Construction
     78   /// @{
     79 
     80   static const AArch64MCExpr *Create(VariantKind Kind, const MCExpr *Expr,
     81                                      MCContext &Ctx);
     82 
     83   static const AArch64MCExpr *CreateLo12(const MCExpr *Expr, MCContext &Ctx) {
     84     return Create(VK_AARCH64_LO12, Expr, Ctx);
     85   }
     86 
     87   static const AArch64MCExpr *CreateGOT(const MCExpr *Expr, MCContext &Ctx) {
     88     return Create(VK_AARCH64_GOT, Expr, Ctx);
     89   }
     90 
     91   static const AArch64MCExpr *CreateGOTLo12(const MCExpr *Expr,
     92                                             MCContext &Ctx) {
     93     return Create(VK_AARCH64_GOT_LO12, Expr, Ctx);
     94   }
     95 
     96   static const AArch64MCExpr *CreateDTPREL_G1(const MCExpr *Expr,
     97                                              MCContext &Ctx) {
     98     return Create(VK_AARCH64_DTPREL_G1, Expr, Ctx);
     99   }
    100 
    101   static const AArch64MCExpr *CreateDTPREL_G0_NC(const MCExpr *Expr,
    102                                                 MCContext &Ctx) {
    103     return Create(VK_AARCH64_DTPREL_G0_NC, Expr, Ctx);
    104   }
    105 
    106   static const AArch64MCExpr *CreateGOTTPREL(const MCExpr *Expr,
    107                                              MCContext &Ctx) {
    108     return Create(VK_AARCH64_GOTTPREL, Expr, Ctx);
    109   }
    110 
    111   static const AArch64MCExpr *CreateGOTTPRELLo12(const MCExpr *Expr,
    112                                                  MCContext &Ctx) {
    113     return Create(VK_AARCH64_GOTTPREL_LO12, Expr, Ctx);
    114   }
    115 
    116   static const AArch64MCExpr *CreateTLSDesc(const MCExpr *Expr,
    117                                             MCContext &Ctx) {
    118     return Create(VK_AARCH64_TLSDESC, Expr, Ctx);
    119   }
    120 
    121   static const AArch64MCExpr *CreateTLSDescLo12(const MCExpr *Expr,
    122                                                 MCContext &Ctx) {
    123     return Create(VK_AARCH64_TLSDESC_LO12, Expr, Ctx);
    124   }
    125 
    126   static const AArch64MCExpr *CreateTPREL_G1(const MCExpr *Expr,
    127                                              MCContext &Ctx) {
    128     return Create(VK_AARCH64_TPREL_G1, Expr, Ctx);
    129   }
    130 
    131   static const AArch64MCExpr *CreateTPREL_G0_NC(const MCExpr *Expr,
    132                                                 MCContext &Ctx) {
    133     return Create(VK_AARCH64_TPREL_G0_NC, Expr, Ctx);
    134   }
    135 
    136   static const AArch64MCExpr *CreateABS_G3(const MCExpr *Expr,
    137                                            MCContext &Ctx) {
    138     return Create(VK_AARCH64_ABS_G3, Expr, Ctx);
    139   }
    140 
    141   static const AArch64MCExpr *CreateABS_G2_NC(const MCExpr *Expr,
    142                                            MCContext &Ctx) {
    143     return Create(VK_AARCH64_ABS_G2_NC, Expr, Ctx);
    144   }
    145 
    146   static const AArch64MCExpr *CreateABS_G1_NC(const MCExpr *Expr,
    147                                            MCContext &Ctx) {
    148     return Create(VK_AARCH64_ABS_G1_NC, Expr, Ctx);
    149   }
    150 
    151   static const AArch64MCExpr *CreateABS_G0_NC(const MCExpr *Expr,
    152                                            MCContext &Ctx) {
    153     return Create(VK_AARCH64_ABS_G0_NC, Expr, Ctx);
    154   }
    155 
    156   /// @}
    157   /// @name Accessors
    158   /// @{
    159 
    160   /// getOpcode - Get the kind of this expression.
    161   VariantKind getKind() const { return Kind; }
    162 
    163   /// getSubExpr - Get the child of this expression.
    164   const MCExpr *getSubExpr() const { return Expr; }
    165 
    166   /// @}
    167 
    168   void PrintImpl(raw_ostream &OS) const;
    169   bool EvaluateAsRelocatableImpl(MCValue &Res,
    170                                  const MCAsmLayout *Layout) const;
    171   void AddValueSymbols(MCAssembler *) const;
    172   const MCSection *FindAssociatedSection() const {
    173     return getSubExpr()->FindAssociatedSection();
    174   }
    175 
    176   void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const;
    177 
    178   static bool classof(const MCExpr *E) {
    179     return E->getKind() == MCExpr::Target;
    180   }
    181 
    182   static bool classof(const AArch64MCExpr *) { return true; }
    183 
    184 };
    185 } // end namespace llvm
    186 
    187 #endif
    188