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Diffstat (limited to 'lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.h')
| -rw-r--r-- | lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.h b/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.h new file mode 100644 index 0000000000..e869ed0a26 --- /dev/null +++ b/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.h @@ -0,0 +1,168 @@ +//=--- AArch64MCExpr.h - AArch64 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 AArch64-specific MCExprs, used for modifiers like +// ":lo12:" or ":gottprel_g1:". +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_AArch64MCEXPR_H +#define LLVM_AArch64MCEXPR_H + +#include "llvm/MC/MCExpr.h" +#include "llvm/Support/ErrorHandling.h" + +namespace llvm { + +class AArch64MCExpr : 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_HI12 = 0x030, + VK_G0 = 0x040, + VK_G1 = 0x050, + VK_G2 = 0x060, + VK_G3 = 0x070, + 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_S = VK_SABS | VK_G2, + VK_ABS_G2_NC = VK_ABS | VK_G2 | VK_NC, + VK_ABS_G1 = VK_ABS | VK_G1, + VK_ABS_G1_S = VK_SABS | VK_G1, + VK_ABS_G1_NC = VK_ABS | VK_G1 | VK_NC, + VK_ABS_G0 = VK_ABS | VK_G0, + VK_ABS_G0_S = VK_SABS | 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_HI12 = VK_DTPREL | VK_HI12, + 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_HI12 = VK_TPREL | VK_HI12, + 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 AArch64MCExpr(const MCExpr *Expr, VariantKind Kind) + : Expr(Expr), Kind(Kind) {} + +public: + /// @name Construction + /// @{ + + static const AArch64MCExpr *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 override; + + void AddValueSymbols(MCAssembler *) const override; + + const MCSection *FindAssociatedSection() const override; + + bool EvaluateAsRelocatableImpl(MCValue &Res, + const MCAsmLayout *Layout) const override; + + void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override; + + static bool classof(const MCExpr *E) { + return E->getKind() == MCExpr::Target; + } + + static bool classof(const AArch64MCExpr *) { return true; } + +}; +} // end namespace llvm + +#endif |