Coverage Report

Created: 2019-07-24 05:18

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.h
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//=--- AArch64MCExpr.h - AArch64 specific MC expression classes ---*- C++ -*-=//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file describes AArch64-specific MCExprs, used for modifiers like
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// ":lo12:" or ":gottprel_g1:".
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_AARCH64_MCTARGETDESC_AARCH64MCEXPR_H
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#define LLVM_LIB_TARGET_AARCH64_MCTARGETDESC_AARCH64MCEXPR_H
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#include "llvm/MC/MCExpr.h"
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#include "llvm/Support/ErrorHandling.h"
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namespace llvm {
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class AArch64MCExpr : public MCTargetExpr {
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public:
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  enum VariantKind {
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    // Symbol locations specifying (roughly speaking) what calculation should be
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    // performed to construct the final address for the relocated
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    // symbol. E.g. direct, via the GOT, ...
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    VK_ABS      = 0x001,
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    VK_SABS     = 0x002,
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    VK_PREL     = 0x003,
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    VK_GOT      = 0x004,
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    VK_DTPREL   = 0x005,
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    VK_GOTTPREL = 0x006,
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    VK_TPREL    = 0x007,
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    VK_TLSDESC  = 0x008,
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    VK_SECREL   = 0x009,
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    VK_SymLocBits = 0x00f,
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    // Variants specifying which part of the final address calculation is
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    // used. E.g. the low 12 bits for an ADD/LDR, the middle 16 bits for a
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    // MOVZ/MOVK.
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    VK_PAGE     = 0x010,
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    VK_PAGEOFF  = 0x020,
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    VK_HI12     = 0x030,
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    VK_G0       = 0x040,
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    VK_G1       = 0x050,
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    VK_G2       = 0x060,
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    VK_G3       = 0x070,
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    VK_AddressFragBits = 0x0f0,
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    // Whether the final relocation is a checked one (where a linker should
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    // perform a range-check on the final address) or not. Note that this field
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    // is unfortunately sometimes omitted from the assembly syntax. E.g. :lo12:
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    // on its own is a non-checked relocation. We side with ELF on being
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    // explicit about this!
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    VK_NC       = 0x100,
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    // Convenience definitions for referring to specific textual representations
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    // of relocation specifiers. Note that this means the "_NC" is sometimes
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    // omitted in line with assembly syntax here (VK_LO12 rather than VK_LO12_NC
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    // since a user would write ":lo12:").
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    VK_CALL              = VK_ABS,
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    VK_ABS_PAGE          = VK_ABS      | VK_PAGE,
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    VK_ABS_PAGE_NC       = VK_ABS      | VK_PAGE    | VK_NC,
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    VK_ABS_G3            = VK_ABS      | VK_G3,
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    VK_ABS_G2            = VK_ABS      | VK_G2,
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    VK_ABS_G2_S          = VK_SABS     | VK_G2,
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    VK_ABS_G2_NC         = VK_ABS      | VK_G2      | VK_NC,
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    VK_ABS_G1            = VK_ABS      | VK_G1,
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    VK_ABS_G1_S          = VK_SABS     | VK_G1,
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    VK_ABS_G1_NC         = VK_ABS      | VK_G1      | VK_NC,
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    VK_ABS_G0            = VK_ABS      | VK_G0,
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    VK_ABS_G0_S          = VK_SABS     | VK_G0,
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    VK_ABS_G0_NC         = VK_ABS      | VK_G0      | VK_NC,
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    VK_LO12              = VK_ABS      | VK_PAGEOFF | VK_NC,
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    VK_PREL_G3           = VK_PREL     | VK_G3,
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    VK_PREL_G2           = VK_PREL     | VK_G2,
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    VK_PREL_G2_NC        = VK_PREL     | VK_G2      | VK_NC,
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    VK_PREL_G1           = VK_PREL     | VK_G1,
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    VK_PREL_G1_NC        = VK_PREL     | VK_G1      | VK_NC,
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    VK_PREL_G0           = VK_PREL     | VK_G0,
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    VK_PREL_G0_NC        = VK_PREL     | VK_G0      | VK_NC,
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    VK_GOT_LO12          = VK_GOT      | VK_PAGEOFF | VK_NC,
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    VK_GOT_PAGE          = VK_GOT      | VK_PAGE,
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    VK_DTPREL_G2         = VK_DTPREL   | VK_G2,
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    VK_DTPREL_G1         = VK_DTPREL   | VK_G1,
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    VK_DTPREL_G1_NC      = VK_DTPREL   | VK_G1      | VK_NC,
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    VK_DTPREL_G0         = VK_DTPREL   | VK_G0,
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    VK_DTPREL_G0_NC      = VK_DTPREL   | VK_G0      | VK_NC,
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    VK_DTPREL_HI12       = VK_DTPREL   | VK_HI12,
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    VK_DTPREL_LO12       = VK_DTPREL   | VK_PAGEOFF,
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    VK_DTPREL_LO12_NC    = VK_DTPREL   | VK_PAGEOFF | VK_NC,
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    VK_GOTTPREL_PAGE     = VK_GOTTPREL | VK_PAGE,
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    VK_GOTTPREL_LO12_NC  = VK_GOTTPREL | VK_PAGEOFF | VK_NC,
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    VK_GOTTPREL_G1       = VK_GOTTPREL | VK_G1,
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    VK_GOTTPREL_G0_NC    = VK_GOTTPREL | VK_G0      | VK_NC,
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    VK_TPREL_G2          = VK_TPREL    | VK_G2,
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    VK_TPREL_G1          = VK_TPREL    | VK_G1,
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    VK_TPREL_G1_NC       = VK_TPREL    | VK_G1      | VK_NC,
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    VK_TPREL_G0          = VK_TPREL    | VK_G0,
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    VK_TPREL_G0_NC       = VK_TPREL    | VK_G0      | VK_NC,
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    VK_TPREL_HI12        = VK_TPREL    | VK_HI12,
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    VK_TPREL_LO12        = VK_TPREL    | VK_PAGEOFF,
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    VK_TPREL_LO12_NC     = VK_TPREL    | VK_PAGEOFF | VK_NC,
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    VK_TLSDESC_LO12      = VK_TLSDESC  | VK_PAGEOFF,
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    VK_TLSDESC_PAGE      = VK_TLSDESC  | VK_PAGE,
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    VK_SECREL_LO12       = VK_SECREL   | VK_PAGEOFF,
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    VK_SECREL_HI12       = VK_SECREL   | VK_HI12,
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    VK_INVALID  = 0xfff
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  };
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private:
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  const MCExpr *Expr;
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  const VariantKind Kind;
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  explicit AArch64MCExpr(const MCExpr *Expr, VariantKind Kind)
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    : Expr(Expr), Kind(Kind) {}
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public:
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  /// @name Construction
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  /// @{
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  static const AArch64MCExpr *create(const MCExpr *Expr, VariantKind Kind,
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                                   MCContext &Ctx);
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  /// @}
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  /// @name Accessors
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  /// @{
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  /// Get the kind of this expression.
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  VariantKind getKind() const { return Kind; }
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  /// Get the expression this modifier applies to.
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  const MCExpr *getSubExpr() const { return Expr; }
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  /// @}
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  /// @name VariantKind information extractors.
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  /// @{
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  static VariantKind getSymbolLoc(VariantKind Kind) {
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    return static_cast<VariantKind>(Kind & VK_SymLocBits);
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  }
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  static VariantKind getAddressFrag(VariantKind Kind) {
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    return static_cast<VariantKind>(Kind & VK_AddressFragBits);
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  }
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  static bool isNotChecked(VariantKind Kind) { return Kind & VK_NC; }
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  /// @}
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  /// Convert the variant kind into an ELF-appropriate modifier
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  /// (e.g. ":got:", ":lo12:").
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  StringRef getVariantKindName() const;
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  void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
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  void visitUsedExpr(MCStreamer &Streamer) const override;
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  MCFragment *findAssociatedFragment() const override;
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  bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout,
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                                 const MCFixup *Fixup) const override;
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  void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override;
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  static bool classof(const MCExpr *E) {
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    return E->getKind() == MCExpr::Target;
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  }
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  static bool classof(const AArch64MCExpr *) { return true; }
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};
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} // end namespace llvm
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#endif