LCOV - code coverage report
Current view: top level - lib/Target/AArch64/MCTargetDesc - AArch64MCExpr.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 4 5 80.0 %
Date: 2017-09-14 15:23:50 Functions: 0 2 0.0 %
Legend: Lines: hit not hit

          Line data    Source code
       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_LIB_TARGET_AARCH64_MCTARGETDESC_AARCH64MCEXPR_H
      16             : #define LLVM_LIB_TARGET_AARCH64_MCTARGETDESC_AARCH64MCEXPR_H
      17             : 
      18             : #include "llvm/MC/MCExpr.h"
      19             : #include "llvm/Support/ErrorHandling.h"
      20             : 
      21             : namespace llvm {
      22             : 
      23           0 : 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_PAGE_NC       = VK_ABS      | VK_PAGE    | VK_NC,
      66             :     VK_ABS_G3            = VK_ABS      | VK_G3,
      67             :     VK_ABS_G2            = VK_ABS      | VK_G2,
      68             :     VK_ABS_G2_S          = VK_SABS     | VK_G2,
      69             :     VK_ABS_G2_NC         = VK_ABS      | VK_G2      | VK_NC,
      70             :     VK_ABS_G1            = VK_ABS      | VK_G1,
      71             :     VK_ABS_G1_S          = VK_SABS     | VK_G1,
      72             :     VK_ABS_G1_NC         = VK_ABS      | VK_G1      | VK_NC,
      73             :     VK_ABS_G0            = VK_ABS      | VK_G0,
      74             :     VK_ABS_G0_S          = VK_SABS     | VK_G0,
      75             :     VK_ABS_G0_NC         = VK_ABS      | VK_G0      | VK_NC,
      76             :     VK_LO12              = VK_ABS      | VK_PAGEOFF | VK_NC,
      77             :     VK_GOT_LO12          = VK_GOT      | VK_PAGEOFF | VK_NC,
      78             :     VK_GOT_PAGE          = VK_GOT      | VK_PAGE,
      79             :     VK_DTPREL_G2         = VK_DTPREL   | VK_G2,
      80             :     VK_DTPREL_G1         = VK_DTPREL   | VK_G1,
      81             :     VK_DTPREL_G1_NC      = VK_DTPREL   | VK_G1      | VK_NC,
      82             :     VK_DTPREL_G0         = VK_DTPREL   | VK_G0,
      83             :     VK_DTPREL_G0_NC      = VK_DTPREL   | VK_G0      | VK_NC,
      84             :     VK_DTPREL_HI12       = VK_DTPREL   | VK_HI12,
      85             :     VK_DTPREL_LO12       = VK_DTPREL   | VK_PAGEOFF,
      86             :     VK_DTPREL_LO12_NC    = VK_DTPREL   | VK_PAGEOFF | VK_NC,
      87             :     VK_GOTTPREL_PAGE     = VK_GOTTPREL | VK_PAGE,
      88             :     VK_GOTTPREL_LO12_NC  = VK_GOTTPREL | VK_PAGEOFF | VK_NC,
      89             :     VK_GOTTPREL_G1       = VK_GOTTPREL | VK_G1,
      90             :     VK_GOTTPREL_G0_NC    = VK_GOTTPREL | VK_G0      | VK_NC,
      91             :     VK_TPREL_G2          = VK_TPREL    | VK_G2,
      92             :     VK_TPREL_G1          = VK_TPREL    | VK_G1,
      93             :     VK_TPREL_G1_NC       = VK_TPREL    | VK_G1      | VK_NC,
      94             :     VK_TPREL_G0          = VK_TPREL    | VK_G0,
      95             :     VK_TPREL_G0_NC       = VK_TPREL    | VK_G0      | VK_NC,
      96             :     VK_TPREL_HI12        = VK_TPREL    | VK_HI12,
      97             :     VK_TPREL_LO12        = VK_TPREL    | VK_PAGEOFF,
      98             :     VK_TPREL_LO12_NC     = VK_TPREL    | VK_PAGEOFF | VK_NC,
      99             :     VK_TLSDESC_LO12      = VK_TLSDESC  | VK_PAGEOFF,
     100             :     VK_TLSDESC_PAGE      = VK_TLSDESC  | VK_PAGE,
     101             : 
     102             :     VK_INVALID  = 0xfff
     103             :   };
     104             : 
     105             : private:
     106             :   const MCExpr *Expr;
     107             :   const VariantKind Kind;
     108             : 
     109             :   explicit AArch64MCExpr(const MCExpr *Expr, VariantKind Kind)
     110       13010 :     : Expr(Expr), Kind(Kind) {}
     111             : 
     112             : public:
     113             :   /// @name Construction
     114             :   /// @{
     115             : 
     116             :   static const AArch64MCExpr *create(const MCExpr *Expr, VariantKind Kind,
     117             :                                    MCContext &Ctx);
     118             : 
     119             :   /// @}
     120             :   /// @name Accessors
     121             :   /// @{
     122             : 
     123             :   /// Get the kind of this expression.
     124             :   VariantKind getKind() const { return Kind; }
     125             : 
     126             :   /// Get the expression this modifier applies to.
     127             :   const MCExpr *getSubExpr() const { return Expr; }
     128             : 
     129             :   /// @}
     130             :   /// @name VariantKind information extractors.
     131             :   /// @{
     132             : 
     133             :   static VariantKind getSymbolLoc(VariantKind Kind) {
     134        1390 :     return static_cast<VariantKind>(Kind & VK_SymLocBits);
     135             :   }
     136             : 
     137             :   static VariantKind getAddressFrag(VariantKind Kind) {
     138             :     return static_cast<VariantKind>(Kind & VK_AddressFragBits);
     139             :   }
     140             : 
     141         810 :   static bool isNotChecked(VariantKind Kind) { return Kind & VK_NC; }
     142             : 
     143             :   /// @}
     144             : 
     145             :   /// Convert the variant kind into an ELF-appropriate modifier
     146             :   /// (e.g. ":got:", ":lo12:").
     147             :   StringRef getVariantKindName() const;
     148             : 
     149             :   void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
     150             : 
     151             :   void visitUsedExpr(MCStreamer &Streamer) const override;
     152             : 
     153             :   MCFragment *findAssociatedFragment() const override;
     154             : 
     155             :   bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout,
     156             :                                  const MCFixup *Fixup) const override;
     157             : 
     158             :   void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override;
     159             : 
     160             :   static bool classof(const MCExpr *E) {
     161        2033 :     return E->getKind() == MCExpr::Target;
     162             :   }
     163             : 
     164             :   static bool classof(const AArch64MCExpr *) { return true; }
     165             : };
     166             : } // end namespace llvm
     167             : 
     168             : #endif

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