LCOV - code coverage report
Current view: top level - include/llvm/MC - MCELFObjectWriter.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 9 22 40.9 %
Date: 2018-09-23 13:06:45 Functions: 1 12 8.3 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===- llvm/MC/MCELFObjectWriter.h - ELF Object Writer ----------*- 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             : #ifndef LLVM_MC_MCELFOBJECTWRITER_H
      11             : #define LLVM_MC_MCELFOBJECTWRITER_H
      12             : 
      13             : #include "llvm/ADT/Triple.h"
      14             : #include "llvm/BinaryFormat/ELF.h"
      15             : #include "llvm/MC/MCObjectWriter.h"
      16             : #include "llvm/MC/MCSectionELF.h"
      17             : #include "llvm/Support/Casting.h"
      18             : #include "llvm/Support/raw_ostream.h"
      19             : #include <cstdint>
      20             : #include <vector>
      21             : 
      22             : namespace llvm {
      23             : 
      24             : class MCAssembler;
      25             : class MCContext;
      26             : class MCFixup;
      27             : class MCObjectWriter;
      28             : class MCSymbol;
      29             : class MCSymbolELF;
      30             : class MCValue;
      31             : 
      32             : struct ELFRelocationEntry {
      33             :   uint64_t Offset; // Where is the relocation.
      34             :   const MCSymbolELF *Symbol; // The symbol to relocate with.
      35             :   unsigned Type;   // The type of the relocation.
      36             :   uint64_t Addend; // The addend to use.
      37             :   const MCSymbolELF *OriginalSymbol; // The original value of Symbol if we changed it.
      38             :   uint64_t OriginalAddend; // The original value of addend.
      39             : 
      40             :   ELFRelocationEntry(uint64_t Offset, const MCSymbolELF *Symbol, unsigned Type,
      41             :                      uint64_t Addend, const MCSymbolELF *OriginalSymbol,
      42             :                      uint64_t OriginalAddend)
      43     5764154 :       : Offset(Offset), Symbol(Symbol), Type(Type), Addend(Addend),
      44     5764154 :         OriginalSymbol(OriginalSymbol), OriginalAddend(OriginalAddend) {}
      45             : 
      46             :   void print(raw_ostream &Out) const {
      47             :     Out << "Off=" << Offset << ", Sym=" << Symbol << ", Type=" << Type
      48             :         << ", Addend=" << Addend << ", OriginalSymbol=" << OriginalSymbol
      49             :         << ", OriginalAddend=" << OriginalAddend;
      50             :   }
      51             : 
      52             :   void dump() const { print(errs()); }
      53             : };
      54             : 
      55             : class MCELFObjectTargetWriter : public MCObjectTargetWriter {
      56             :   const uint8_t OSABI;
      57             :   const uint16_t EMachine;
      58             :   const unsigned HasRelocationAddend : 1;
      59             :   const unsigned Is64Bit : 1;
      60             : 
      61             : protected:
      62             :   MCELFObjectTargetWriter(bool Is64Bit_, uint8_t OSABI_, uint16_t EMachine_,
      63             :                           bool HasRelocationAddend);
      64             : 
      65             : public:
      66           0 :   virtual ~MCELFObjectTargetWriter() = default;
      67             : 
      68       31692 :   virtual Triple::ObjectFormatType getFormat() const { return Triple::ELF; }
      69             :   static bool classof(const MCObjectTargetWriter *W) {
      70             :     return W->getFormat() == Triple::ELF;
      71             :   }
      72             : 
      73             :   static uint8_t getOSABI(Triple::OSType OSType) {
      74             :     switch (OSType) {
      75             :       case Triple::CloudABI:
      76             :         return ELF::ELFOSABI_CLOUDABI;
      77             :       case Triple::HermitCore:
      78             :         return ELF::ELFOSABI_STANDALONE;
      79             :       case Triple::PS4:
      80             :       case Triple::FreeBSD:
      81             :         return ELF::ELFOSABI_FREEBSD;
      82             :       default:
      83             :         return ELF::ELFOSABI_NONE;
      84             :     }
      85             :   }
      86             : 
      87             :   virtual unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
      88             :                                 const MCFixup &Fixup, bool IsPCRel) const = 0;
      89             : 
      90             :   virtual bool needsRelocateWithSymbol(const MCSymbol &Sym,
      91             :                                        unsigned Type) const;
      92             : 
      93             :   virtual void sortRelocs(const MCAssembler &Asm,
      94             :                           std::vector<ELFRelocationEntry> &Relocs);
      95             : 
      96             :   virtual void addTargetSectionFlags(MCContext &Ctx, MCSectionELF &Sec);
      97             : 
      98             :   /// \name Accessors
      99             :   /// @{
     100           0 :   uint8_t getOSABI() const { return OSABI; }
     101           0 :   uint16_t getEMachine() const { return EMachine; }
     102    13300760 :   bool hasRelocationAddend() const { return HasRelocationAddend; }
     103    14017778 :   bool is64Bit() const { return Is64Bit; }
     104             :   /// @}
     105             : 
     106             :   // Instead of changing everyone's API we pack the N64 Type fields
     107             :   // into the existing 32 bit data unsigned.
     108             : #define R_TYPE_SHIFT 0
     109             : #define R_TYPE_MASK 0xffffff00
     110             : #define R_TYPE2_SHIFT 8
     111             : #define R_TYPE2_MASK 0xffff00ff
     112             : #define R_TYPE3_SHIFT 16
     113             : #define R_TYPE3_MASK 0xff00ffff
     114             : #define R_SSYM_SHIFT 24
     115             : #define R_SSYM_MASK 0x00ffffff
     116             : 
     117             :   // N64 relocation type accessors
     118           0 :   uint8_t getRType(uint32_t Type) const {
     119       10329 :     return (unsigned)((Type >> R_TYPE_SHIFT) & 0xff);
     120             :   }
     121           0 :   uint8_t getRType2(uint32_t Type) const {
     122       11374 :     return (unsigned)((Type >> R_TYPE2_SHIFT) & 0xff);
     123             :   }
     124           0 :   uint8_t getRType3(uint32_t Type) const {
     125       11374 :     return (unsigned)((Type >> R_TYPE3_SHIFT) & 0xff);
     126             :   }
     127           0 :   uint8_t getRSsym(uint32_t Type) const {
     128       10329 :     return (unsigned)((Type >> R_SSYM_SHIFT) & 0xff);
     129             :   }
     130             : 
     131             :   // N64 relocation type setting
     132           0 :   unsigned setRType(unsigned Value, unsigned Type) const {
     133           0 :     return ((Type & R_TYPE_MASK) | ((Value & 0xff) << R_TYPE_SHIFT));
     134             :   }
     135           0 :   unsigned setRType2(unsigned Value, unsigned Type) const {
     136           0 :     return (Type & R_TYPE2_MASK) | ((Value & 0xff) << R_TYPE2_SHIFT);
     137             :   }
     138           0 :   unsigned setRType3(unsigned Value, unsigned Type) const {
     139           0 :     return (Type & R_TYPE3_MASK) | ((Value & 0xff) << R_TYPE3_SHIFT);
     140             :   }
     141             :   unsigned setRSsym(unsigned Value, unsigned Type) const {
     142             :     return (Type & R_SSYM_MASK) | ((Value & 0xff) << R_SSYM_SHIFT);
     143             :   }
     144             : };
     145             : 
     146             : /// Construct a new ELF writer instance.
     147             : ///
     148             : /// \param MOTW - The target specific ELF writer subclass.
     149             : /// \param OS - The stream to write to.
     150             : /// \returns The constructed object writer.
     151             : std::unique_ptr<MCObjectWriter>
     152             : createELFObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW,
     153             :                       raw_pwrite_stream &OS, bool IsLittleEndian);
     154             : 
     155             : std::unique_ptr<MCObjectWriter>
     156             : createELFDwoObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW,
     157             :                          raw_pwrite_stream &OS, raw_pwrite_stream &DwoOS,
     158             :                          bool IsLittleEndian);
     159             : 
     160             : } // end namespace llvm
     161             : 
     162             : #endif // LLVM_MC_MCELFOBJECTWRITER_H

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