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 #include "llvm/Support/ErrorHandling.h" 20 21 namespace llvm { 22 23 class AArch64MCExpr : public MCTargetExpr { 24 public: 25 enum VariantKind { 26 VK_NONE = 0x000, 27 28 // Symbol locations specifying (roughly speaking) what calculation should be 29 // performed to construct the final address for the relocated 30 // symbol. E.g. direct, via the GOT, ... 31 VK_ABS = 0x001, 32 VK_SABS = 0x002, 33 VK_GOT = 0x003, 34 VK_DTPREL = 0x004, 35 VK_GOTTPREL = 0x005, 36 VK_TPREL = 0x006, 37 VK_TLSDESC = 0x007, 38 VK_SymLocBits = 0x00f, 39 40 // Variants specifying which part of the final address calculation is 41 // used. E.g. the low 12 bits for an ADD/LDR, the middle 16 bits for a 42 // MOVZ/MOVK. 43 VK_PAGE = 0x010, 44 VK_PAGEOFF = 0x020, 45 VK_HI12 = 0x030, 46 VK_G0 = 0x040, 47 VK_G1 = 0x050, 48 VK_G2 = 0x060, 49 VK_G3 = 0x070, 50 VK_AddressFragBits = 0x0f0, 51 52 // Whether the final relocation is a checked one (where a linker should 53 // perform a range-check on the final address) or not. Note that this field 54 // is unfortunately sometimes omitted from the assembly syntax. E.g. :lo12: 55 // on its own is a non-checked relocation. We side with ELF on being 56 // explicit about this! 57 VK_NC = 0x100, 58 59 // Convenience definitions for referring to specific textual representations 60 // of relocation specifiers. Note that this means the "_NC" is sometimes 61 // omitted in line with assembly syntax here (VK_LO12 rather than VK_LO12_NC 62 // since a user would write ":lo12:"). 63 VK_CALL = VK_ABS, 64 VK_ABS_PAGE = VK_ABS | VK_PAGE, 65 VK_ABS_G3 = VK_ABS | VK_G3, 66 VK_ABS_G2 = VK_ABS | VK_G2, 67 VK_ABS_G2_S = VK_SABS | VK_G2, 68 VK_ABS_G2_NC = VK_ABS | VK_G2 | VK_NC, 69 VK_ABS_G1 = VK_ABS | VK_G1, 70 VK_ABS_G1_S = VK_SABS | VK_G1, 71 VK_ABS_G1_NC = VK_ABS | VK_G1 | VK_NC, 72 VK_ABS_G0 = VK_ABS | VK_G0, 73 VK_ABS_G0_S = VK_SABS | VK_G0, 74 VK_ABS_G0_NC = VK_ABS | VK_G0 | VK_NC, 75 VK_LO12 = VK_ABS | VK_PAGEOFF | VK_NC, 76 VK_GOT_LO12 = VK_GOT | VK_PAGEOFF | VK_NC, 77 VK_GOT_PAGE = VK_GOT | VK_PAGE, 78 VK_DTPREL_G2 = VK_DTPREL | VK_G2, 79 VK_DTPREL_G1 = VK_DTPREL | VK_G1, 80 VK_DTPREL_G1_NC = VK_DTPREL | VK_G1 | VK_NC, 81 VK_DTPREL_G0 = VK_DTPREL | VK_G0, 82 VK_DTPREL_G0_NC = VK_DTPREL | VK_G0 | VK_NC, 83 VK_DTPREL_HI12 = VK_DTPREL | VK_HI12, 84 VK_DTPREL_LO12 = VK_DTPREL | VK_PAGEOFF, 85 VK_DTPREL_LO12_NC = VK_DTPREL | VK_PAGEOFF | VK_NC, 86 VK_GOTTPREL_PAGE = VK_GOTTPREL | VK_PAGE, 87 VK_GOTTPREL_LO12_NC = VK_GOTTPREL | VK_PAGEOFF | VK_NC, 88 VK_GOTTPREL_G1 = VK_GOTTPREL | VK_G1, 89 VK_GOTTPREL_G0_NC = VK_GOTTPREL | VK_G0 | VK_NC, 90 VK_TPREL_G2 = VK_TPREL | VK_G2, 91 VK_TPREL_G1 = VK_TPREL | VK_G1, 92 VK_TPREL_G1_NC = VK_TPREL | VK_G1 | VK_NC, 93 VK_TPREL_G0 = VK_TPREL | VK_G0, 94 VK_TPREL_G0_NC = VK_TPREL | VK_G0 | VK_NC, 95 VK_TPREL_HI12 = VK_TPREL | VK_HI12, 96 VK_TPREL_LO12 = VK_TPREL | VK_PAGEOFF, 97 VK_TPREL_LO12_NC = VK_TPREL | VK_PAGEOFF | VK_NC, 98 VK_TLSDESC_LO12 = VK_TLSDESC | VK_PAGEOFF | VK_NC, 99 VK_TLSDESC_PAGE = VK_TLSDESC | VK_PAGE, 100 101 VK_INVALID = 0xfff 102 }; 103 104 private: 105 const MCExpr *Expr; 106 const VariantKind Kind; 107 108 explicit AArch64MCExpr(const MCExpr *Expr, VariantKind Kind) 109 : Expr(Expr), Kind(Kind) {} 110 111 public: 112 /// @name Construction 113 /// @{ 114 115 static const AArch64MCExpr *Create(const MCExpr *Expr, VariantKind Kind, 116 MCContext &Ctx); 117 118 /// @} 119 /// @name Accessors 120 /// @{ 121 122 /// Get the kind of this expression. 123 VariantKind getKind() const { return static_cast<VariantKind>(Kind); } 124 125 /// Get the expression this modifier applies to. 126 const MCExpr *getSubExpr() const { return Expr; } 127 128 /// @} 129 /// @name VariantKind information extractors. 130 /// @{ 131 132 static VariantKind getSymbolLoc(VariantKind Kind) { 133 return static_cast<VariantKind>(Kind & VK_SymLocBits); 134 } 135 136 static VariantKind getAddressFrag(VariantKind Kind) { 137 return static_cast<VariantKind>(Kind & VK_AddressFragBits); 138 } 139 140 static bool isNotChecked(VariantKind Kind) { return Kind & VK_NC; } 141 142 /// @} 143 144 /// Convert the variant kind into an ELF-appropriate modifier 145 /// (e.g. ":got:", ":lo12:"). 146 StringRef getVariantKindName() const; 147 148 void PrintImpl(raw_ostream &OS) const override; 149 150 void visitUsedExpr(MCStreamer &Streamer) const override; 151 152 const MCSection *FindAssociatedSection() const override; 153 154 bool EvaluateAsRelocatableImpl(MCValue &Res, 155 const MCAsmLayout *Layout) const override; 156 157 void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override; 158 159 static bool classof(const MCExpr *E) { 160 return E->getKind() == MCExpr::Target; 161 } 162 163 static bool classof(const AArch64MCExpr *) { return true; } 164 165 }; 166 } // end namespace llvm 167 168 #endif 169
