LCOV - code coverage report
Current view: top level - include/llvm/MC - MCELFObjectWriter.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 12 12 100.0 %
Date: 2018-06-17 00:07:59 Functions: 1 1 100.0 %
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/MC/MCObjectWriter.h"
      16             : #include "llvm/Support/Casting.h"
      17             : #include "llvm/Support/raw_ostream.h"
      18             : #include <cstdint>
      19             : #include <vector>
      20             : 
      21             : namespace llvm {
      22             : 
      23             : class MCAssembler;
      24             : class MCContext;
      25             : class MCFixup;
      26             : class MCObjectWriter;
      27             : class MCSymbol;
      28             : class MCSymbolELF;
      29             : class MCValue;
      30             : 
      31             : struct ELFRelocationEntry {
      32             :   uint64_t Offset; // Where is the relocation.
      33             :   const MCSymbolELF *Symbol; // The symbol to relocate with.
      34             :   unsigned Type;   // The type of the relocation.
      35             :   uint64_t Addend; // The addend to use.
      36             :   const MCSymbolELF *OriginalSymbol; // The original value of Symbol if we changed it.
      37             :   uint64_t OriginalAddend; // The original value of addend.
      38             : 
      39             :   ELFRelocationEntry(uint64_t Offset, const MCSymbolELF *Symbol, unsigned Type,
      40             :                      uint64_t Addend, const MCSymbolELF *OriginalSymbol,
      41             :                      uint64_t OriginalAddend)
      42     2277336 :       : Offset(Offset), Symbol(Symbol), Type(Type), Addend(Addend),
      43     2277336 :         OriginalSymbol(OriginalSymbol), OriginalAddend(OriginalAddend) {}
      44             : 
      45             :   void print(raw_ostream &Out) const {
      46             :     Out << "Off=" << Offset << ", Sym=" << Symbol << ", Type=" << Type
      47             :         << ", Addend=" << Addend << ", OriginalSymbol=" << OriginalSymbol
      48             :         << ", OriginalAddend=" << OriginalAddend;
      49             :   }
      50             : 
      51             :   void dump() const { print(errs()); }
      52             : };
      53             : 
      54             : class MCELFObjectTargetWriter : public MCObjectTargetWriter {
      55             :   const uint8_t OSABI;
      56             :   const uint16_t EMachine;
      57             :   const unsigned HasRelocationAddend : 1;
      58             :   const unsigned Is64Bit : 1;
      59             : 
      60             : protected:
      61             :   MCELFObjectTargetWriter(bool Is64Bit_, uint8_t OSABI_, uint16_t EMachine_,
      62             :                           bool HasRelocationAddend);
      63             : 
      64             : public:
      65             :   virtual ~MCELFObjectTargetWriter() = default;
      66             : 
      67       24571 :   virtual Triple::ObjectFormatType getFormat() const { return Triple::ELF; }
      68             :   static bool classof(const MCObjectTargetWriter *W) {
      69             :     return W->getFormat() == Triple::ELF;
      70             :   }
      71             : 
      72             :   static uint8_t getOSABI(Triple::OSType OSType) {
      73       22034 :     switch (OSType) {
      74             :       case Triple::CloudABI:
      75             :         return ELF::ELFOSABI_CLOUDABI;
      76         176 :       case Triple::PS4:
      77             :       case Triple::FreeBSD:
      78             :         return ELF::ELFOSABI_FREEBSD;
      79       21854 :       default:
      80             :         return ELF::ELFOSABI_NONE;
      81             :     }
      82             :   }
      83             : 
      84             :   virtual unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
      85             :                                 const MCFixup &Fixup, bool IsPCRel) const = 0;
      86             : 
      87             :   virtual bool needsRelocateWithSymbol(const MCSymbol &Sym,
      88             :                                        unsigned Type) const;
      89             : 
      90             :   virtual void sortRelocs(const MCAssembler &Asm,
      91             :                           std::vector<ELFRelocationEntry> &Relocs);
      92             : 
      93             :   /// \name Accessors
      94             :   /// @{
      95             :   uint8_t getOSABI() const { return OSABI; }
      96             :   uint16_t getEMachine() const { return EMachine; }
      97     5405239 :   bool hasRelocationAddend() const { return HasRelocationAddend; }
      98     5781136 :   bool is64Bit() const { return Is64Bit; }
      99             :   /// @}
     100             : 
     101             :   // Instead of changing everyone's API we pack the N64 Type fields
     102             :   // into the existing 32 bit data unsigned.
     103             : #define R_TYPE_SHIFT 0
     104             : #define R_TYPE_MASK 0xffffff00
     105             : #define R_TYPE2_SHIFT 8
     106             : #define R_TYPE2_MASK 0xffff00ff
     107             : #define R_TYPE3_SHIFT 16
     108             : #define R_TYPE3_MASK 0xff00ffff
     109             : #define R_SSYM_SHIFT 24
     110             : #define R_SSYM_MASK 0x00ffffff
     111             : 
     112             :   // N64 relocation type accessors
     113             :   uint8_t getRType(uint32_t Type) const {
     114       10336 :     return (unsigned)((Type >> R_TYPE_SHIFT) & 0xff);
     115             :   }
     116             :   uint8_t getRType2(uint32_t Type) const {
     117       11367 :     return (unsigned)((Type >> R_TYPE2_SHIFT) & 0xff);
     118             :   }
     119             :   uint8_t getRType3(uint32_t Type) const {
     120       11367 :     return (unsigned)((Type >> R_TYPE3_SHIFT) & 0xff);
     121             :   }
     122             :   uint8_t getRSsym(uint32_t Type) const {
     123       10336 :     return (unsigned)((Type >> R_SSYM_SHIFT) & 0xff);
     124             :   }
     125             : 
     126             :   // N64 relocation type setting
     127             :   unsigned setRType(unsigned Value, unsigned Type) const {
     128             :     return ((Type & R_TYPE_MASK) | ((Value & 0xff) << R_TYPE_SHIFT));
     129             :   }
     130             :   unsigned setRType2(unsigned Value, unsigned Type) const {
     131             :     return (Type & R_TYPE2_MASK) | ((Value & 0xff) << R_TYPE2_SHIFT);
     132             :   }
     133             :   unsigned setRType3(unsigned Value, unsigned Type) const {
     134             :     return (Type & R_TYPE3_MASK) | ((Value & 0xff) << R_TYPE3_SHIFT);
     135             :   }
     136             :   unsigned setRSsym(unsigned Value, unsigned Type) const {
     137             :     return (Type & R_SSYM_MASK) | ((Value & 0xff) << R_SSYM_SHIFT);
     138             :   }
     139             : };
     140             : 
     141             : /// Construct a new ELF writer instance.
     142             : ///
     143             : /// \param MOTW - The target specific ELF writer subclass.
     144             : /// \param OS - The stream to write to.
     145             : /// \returns The constructed object writer.
     146             : std::unique_ptr<MCObjectWriter>
     147             : createELFObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW,
     148             :                       raw_pwrite_stream &OS, bool IsLittleEndian);
     149             : 
     150             : std::unique_ptr<MCObjectWriter>
     151             : createELFDwoObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW,
     152             :                          raw_pwrite_stream &OS, raw_pwrite_stream &DwoOS,
     153             :                          bool IsLittleEndian);
     154             : 
     155             : } // end namespace llvm
     156             : 
     157             : #endif // LLVM_MC_MCELFOBJECTWRITER_H

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