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//=---- 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_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 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 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 ARM64MCExpr *) { return true; }
};
} // end namespace llvm
#endif
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