//=---- ARM64MCExpr.h - ARM64 specific MC expression classes ------*- C++ -*-=// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file describes ARM64-specific MCExprs, used for modifiers like // ":lo12:" or ":gottprel_g1:". // //===----------------------------------------------------------------------===// #ifndef LLVM_ARM64MCEXPR_H #define LLVM_ARM64MCEXPR_H #include "llvm/MC/MCExpr.h" #include "llvm/Support/ErrorHandling.h" namespace llvm { class ARM64MCExpr : public MCTargetExpr { public: enum VariantKind { VK_NONE = 0x000, // Symbol locations specifying (roughly speaking) what calculation should be // performed to construct the final address for the relocated // symbol. E.g. direct, via the GOT, ... VK_ABS = 0x001, VK_SABS = 0x002, VK_GOT = 0x003, VK_DTPREL = 0x004, VK_GOTTPREL = 0x005, VK_TPREL = 0x006, VK_TLSDESC = 0x007, VK_SymLocBits = 0x00f, // Variants specifying which part of the final address calculation is // used. E.g. the low 12 bits for an ADD/LDR, the middle 16 bits for a // MOVZ/MOVK. VK_PAGE = 0x010, VK_PAGEOFF = 0x020, VK_G0 = 0x030, VK_G1 = 0x040, VK_G2 = 0x050, VK_G3 = 0x060, VK_AddressFragBits = 0x0f0, // Whether the final relocation is a checked one (where a linker should // perform a range-check on the final address) or not. Note that this field // is unfortunately sometimes omitted from the assembly syntax. E.g. :lo12: // on its own is a non-checked relocation. We side with ELF on being // explicit about this! VK_NC = 0x100, // Convenience definitions for referring to specific textual representations // of relocation specifiers. Note that this means the "_NC" is sometimes // omitted in line with assembly syntax here (VK_LO12 rather than VK_LO12_NC // since a user would write ":lo12:"). VK_CALL = VK_ABS, VK_ABS_PAGE = VK_ABS | VK_PAGE, VK_ABS_G3 = VK_ABS | VK_G3, VK_ABS_G2 = VK_ABS | VK_G2, VK_ABS_G2_NC = VK_ABS | VK_G2 | VK_NC, VK_ABS_G1 = VK_ABS | VK_G1, VK_ABS_G1_NC = VK_ABS | VK_G1 | VK_NC, VK_ABS_G0 = VK_ABS | VK_G0, VK_ABS_G0_NC = VK_ABS | VK_G0 | VK_NC, VK_LO12 = VK_ABS | VK_PAGEOFF | VK_NC, VK_GOT_LO12 = VK_GOT | VK_PAGEOFF | VK_NC, VK_GOT_PAGE = VK_GOT | VK_PAGE, VK_DTPREL_G2 = VK_DTPREL | VK_G2, VK_DTPREL_G1 = VK_DTPREL | VK_G1, VK_DTPREL_G1_NC = VK_DTPREL | VK_G1 | VK_NC, VK_DTPREL_G0 = VK_DTPREL | VK_G0, VK_DTPREL_G0_NC = VK_DTPREL | VK_G0 | VK_NC, VK_DTPREL_LO12 = VK_DTPREL | VK_PAGEOFF, VK_DTPREL_LO12_NC = VK_DTPREL | VK_PAGEOFF | VK_NC, VK_GOTTPREL_PAGE = VK_GOTTPREL | VK_PAGE, VK_GOTTPREL_LO12_NC = VK_GOTTPREL | VK_PAGEOFF | VK_NC, VK_GOTTPREL_G1 = VK_GOTTPREL | VK_G1, VK_GOTTPREL_G0_NC = VK_GOTTPREL | VK_G0 | VK_NC, VK_TPREL_G2 = VK_TPREL | VK_G2, VK_TPREL_G1 = VK_TPREL | VK_G1, VK_TPREL_G1_NC = VK_TPREL | VK_G1 | VK_NC, VK_TPREL_G0 = VK_TPREL | VK_G0, VK_TPREL_G0_NC = VK_TPREL | VK_G0 | VK_NC, VK_TPREL_LO12 = VK_TPREL | VK_PAGEOFF, VK_TPREL_LO12_NC = VK_TPREL | VK_PAGEOFF | VK_NC, VK_TLSDESC_LO12 = VK_TLSDESC | VK_PAGEOFF | VK_NC, VK_TLSDESC_PAGE = VK_TLSDESC | VK_PAGE, VK_INVALID = 0xfff }; private: const MCExpr *Expr; const VariantKind Kind; explicit ARM64MCExpr(const MCExpr *Expr, VariantKind Kind) : Expr(Expr), Kind(Kind) {} public: /// @name Construction /// @{ static const ARM64MCExpr *Create(const MCExpr *Expr, VariantKind Kind, MCContext &Ctx); /// @} /// @name Accessors /// @{ /// Get the kind of this expression. VariantKind getKind() const { return static_cast<VariantKind>(Kind); } /// Get the expression this modifier applies to. const MCExpr *getSubExpr() const { return Expr; } /// @} /// @name VariantKind information extractors. /// @{ static VariantKind getSymbolLoc(VariantKind Kind) { return static_cast<VariantKind>(Kind & VK_SymLocBits); } static VariantKind getAddressFrag(VariantKind Kind) { return static_cast<VariantKind>(Kind & VK_AddressFragBits); } static bool isNotChecked(VariantKind Kind) { return Kind & VK_NC; } /// @} /// Convert the variant kind into an ELF-appropriate modifier /// (e.g. ":got:", ":lo12:"). StringRef getVariantKindName() const; void PrintImpl(raw_ostream &OS) const; void AddValueSymbols(MCAssembler *) const; const MCSection *FindAssociatedSection() const; bool EvaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout) const; void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const; static bool classof(const MCExpr *E) { return E->getKind() == MCExpr::Target; } static bool classof(const ARM64MCExpr *) { return true; } }; } // end namespace llvm #endif