LCOV - code coverage report
Current view: top level - include/llvm/MC - MCELFObjectWriter.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 11 11 100.0 %
Date: 2017-09-14 15:23:50 Functions: 0 0 -
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/Support/Casting.h"
      16             : #include "llvm/Support/raw_ostream.h"
      17             : #include <cstdint>
      18             : #include <vector>
      19             : 
      20             : namespace llvm {
      21             : 
      22             : class MCAssembler;
      23             : class MCContext;
      24             : class MCFixup;
      25             : class MCObjectWriter;
      26             : class MCSymbol;
      27             : class MCSymbolELF;
      28             : class MCValue;
      29             : 
      30             : struct ELFRelocationEntry {
      31             :   uint64_t Offset; // Where is the relocation.
      32             :   const MCSymbolELF *Symbol; // The symbol to relocate with.
      33             :   unsigned Type;   // The type of the relocation.
      34             :   uint64_t Addend; // The addend to use.
      35             :   const MCSymbolELF *OriginalSymbol; // The original value of Symbol if we changed it.
      36             :   uint64_t OriginalAddend; // The original value of addend.
      37             : 
      38             :   ELFRelocationEntry(uint64_t Offset, const MCSymbolELF *Symbol, unsigned Type,
      39             :                      uint64_t Addend, const MCSymbolELF *OriginalSymbol,
      40             :                      uint64_t OriginalAddend)
      41     1273124 :       : Offset(Offset), Symbol(Symbol), Type(Type), Addend(Addend),
      42     1273124 :         OriginalSymbol(OriginalSymbol), OriginalAddend(OriginalAddend) {}
      43             : 
      44             :   void print(raw_ostream &Out) const {
      45             :     Out << "Off=" << Offset << ", Sym=" << Symbol << ", Type=" << Type
      46             :         << ", Addend=" << Addend << ", OriginalSymbol=" << OriginalSymbol
      47             :         << ", OriginalAddend=" << OriginalAddend;
      48             :   }
      49             : 
      50             :   void dump() const { print(errs()); }
      51             : };
      52             : 
      53             : class MCELFObjectTargetWriter {
      54             :   const uint8_t OSABI;
      55             :   const uint16_t EMachine;
      56             :   const unsigned HasRelocationAddend : 1;
      57             :   const unsigned Is64Bit : 1;
      58             :   const unsigned IsN64 : 1;
      59             : 
      60             : protected:
      61             :   MCELFObjectTargetWriter(bool Is64Bit_, uint8_t OSABI_, uint16_t EMachine_,
      62             :                           bool HasRelocationAddend, bool IsN64 = false);
      63             : 
      64             : public:
      65             :   virtual ~MCELFObjectTargetWriter() = default;
      66             : 
      67             :   static uint8_t getOSABI(Triple::OSType OSType) {
      68       12506 :     switch (OSType) {
      69             :       case Triple::CloudABI:
      70             :         return ELF::ELFOSABI_CLOUDABI;
      71         140 :       case Triple::PS4:
      72             :       case Triple::FreeBSD:
      73             :         return ELF::ELFOSABI_FREEBSD;
      74       12362 :       default:
      75             :         return ELF::ELFOSABI_NONE;
      76             :     }
      77             :   }
      78             : 
      79             :   virtual unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
      80             :                                 const MCFixup &Fixup, bool IsPCRel) const = 0;
      81             : 
      82             :   virtual bool needsRelocateWithSymbol(const MCSymbol &Sym,
      83             :                                        unsigned Type) const;
      84             : 
      85             :   virtual void sortRelocs(const MCAssembler &Asm,
      86             :                           std::vector<ELFRelocationEntry> &Relocs);
      87             : 
      88             :   /// \name Accessors
      89             :   /// @{
      90             :   uint8_t getOSABI() const { return OSABI; }
      91             :   uint16_t getEMachine() const { return EMachine; }
      92     2657444 :   bool hasRelocationAddend() const { return HasRelocationAddend; }
      93     3730587 :   bool is64Bit() const { return Is64Bit; }
      94      579418 :   bool isN64() const { return IsN64; }
      95             :   /// @}
      96             : 
      97             :   // Instead of changing everyone's API we pack the N64 Type fields
      98             :   // into the existing 32 bit data unsigned.
      99             : #define R_TYPE_SHIFT 0
     100             : #define R_TYPE_MASK 0xffffff00
     101             : #define R_TYPE2_SHIFT 8
     102             : #define R_TYPE2_MASK 0xffff00ff
     103             : #define R_TYPE3_SHIFT 16
     104             : #define R_TYPE3_MASK 0xff00ffff
     105             : #define R_SSYM_SHIFT 24
     106             : #define R_SSYM_MASK 0x00ffffff
     107             : 
     108             :   // N64 relocation type accessors
     109             :   uint8_t getRType(uint32_t Type) const {
     110             :     return (unsigned)((Type >> R_TYPE_SHIFT) & 0xff);
     111             :   }
     112             :   uint8_t getRType2(uint32_t Type) const {
     113         329 :     return (unsigned)((Type >> R_TYPE2_SHIFT) & 0xff);
     114             :   }
     115             :   uint8_t getRType3(uint32_t Type) const {
     116         329 :     return (unsigned)((Type >> R_TYPE3_SHIFT) & 0xff);
     117             :   }
     118             :   uint8_t getRSsym(uint32_t Type) const {
     119         329 :     return (unsigned)((Type >> R_SSYM_SHIFT) & 0xff);
     120             :   }
     121             : 
     122             :   // N64 relocation type setting
     123             :   unsigned setRType(unsigned Value, unsigned Type) const {
     124             :     return ((Type & R_TYPE_MASK) | ((Value & 0xff) << R_TYPE_SHIFT));
     125             :   }
     126             :   unsigned setRType2(unsigned Value, unsigned Type) const {
     127             :     return (Type & R_TYPE2_MASK) | ((Value & 0xff) << R_TYPE2_SHIFT);
     128             :   }
     129             :   unsigned setRType3(unsigned Value, unsigned Type) const {
     130             :     return (Type & R_TYPE3_MASK) | ((Value & 0xff) << R_TYPE3_SHIFT);
     131             :   }
     132             :   unsigned setRSsym(unsigned Value, unsigned Type) const {
     133             :     return (Type & R_SSYM_MASK) | ((Value & 0xff) << R_SSYM_SHIFT);
     134             :   }
     135             : };
     136             : 
     137             : /// \brief Construct a new ELF writer instance.
     138             : ///
     139             : /// \param MOTW - The target specific ELF writer subclass.
     140             : /// \param OS - The stream to write to.
     141             : /// \returns The constructed object writer.
     142             : MCObjectWriter *createELFObjectWriter(MCELFObjectTargetWriter *MOTW,
     143             :                                       raw_pwrite_stream &OS,
     144             :                                       bool IsLittleEndian);
     145             : 
     146             : } // end namespace llvm
     147             : 
     148             : #endif // LLVM_MC_MCELFOBJECTWRITER_H

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