lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h

   1 //===-- RuntimeDyldMachO.h - Run-time dynamic linker for MC-JIT ---*- 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 // MachO support for MC-JIT runtime dynamic linker.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_RUNTIME_DYLD_MACHO_H
  15 #define LLVM_RUNTIME_DYLD_MACHO_H
  16
  17 #include "RuntimeDyldImpl.h"
  18 #include "llvm/ADT/IndexedMap.h"
  19 #include "llvm/Object/MachO.h"
  20 #include "llvm/Support/Format.h"
  21
  22 using namespace llvm;
  23 using namespace llvm::object;
  24
  25
  26 namespace llvm {
  27 class RuntimeDyldMachO : public RuntimeDyldImpl {
  28   bool resolveI386Relocation(uint8_t *LocalAddress,
  29                              uint64_t FinalAddress,
  30                              uint64_t Value,
  31                              bool isPCRel,
  32                              unsigned Type,
  33                              unsigned Size,
  34                              int64_t Addend);
  35   bool resolveX86_64Relocation(uint8_t *LocalAddress,
  36                                uint64_t FinalAddress,
  37                                uint64_t Value,
  38                                bool isPCRel,
  39                                unsigned Type,
  40                                unsigned Size,
  41                                int64_t Addend);
  42   bool resolveARMRelocation(uint8_t *LocalAddress,
  43                             uint64_t FinalAddress,
  44                             uint64_t Value,
  45                             bool isPCRel,
  46                             unsigned Type,
  47                             unsigned Size,
  48                             int64_t Addend);
  49
  50   void resolveRelocation(const SectionEntry &Section,
  51                          uint64_t Offset,
  52                          uint64_t Value,
  53                          uint32_t Type,
  54                          int64_t Addend,
  55                          bool isPCRel,
  56                          unsigned Size);
  57
  58   unsigned getMaxStubSize() {
  59     if (Arch == Triple::arm || Arch == Triple::thumb)
  60       return 8; // 32-bit instruction and 32-bit address
  61     else if (Arch == Triple::x86_64)
  62       return 8; // GOT entry
  63     else
  64       return 0;
  65   }
  66
  67   unsigned getStubAlignment() {
  68     return 1;
  69   }
  70
  71   struct EHFrameRelatedSections {
  72     EHFrameRelatedSections() : EHFrameSID(RTDYLD_INVALID_SECTION_ID),
  73                                TextSID(RTDYLD_INVALID_SECTION_ID),
  74                                ExceptTabSID(RTDYLD_INVALID_SECTION_ID) {}
  75     EHFrameRelatedSections(SID EH, SID T, SID Ex)
  76       : EHFrameSID(EH), TextSID(T), ExceptTabSID(Ex) {}
  77     SID EHFrameSID;
  78     SID TextSID;
  79     SID ExceptTabSID;
  80   };
  81
  82   // When a module is loaded we save the SectionID of the EH frame section
  83   // in a table until we receive a request to register all unregistered
  84   // EH frame sections with the memory manager.
  85   SmallVector<EHFrameRelatedSections, 2> UnregisteredEHFrameSections;
  86 public:
  87   RuntimeDyldMachO(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
  88
  89   virtual void resolveRelocation(const RelocationEntry &RE, uint64_t Value);
  90   virtual void processRelocationRef(unsigned SectionID,
  91                                     RelocationRef RelI,
  92                                     ObjectImage &Obj,
  93                                     ObjSectionToIDMap &ObjSectionToID,
  94                                     const SymbolTableMap &Symbols,
  95                                     StubMap &Stubs);
  96   virtual bool isCompatibleFormat(const ObjectBuffer *Buffer) const;
  97   virtual void registerEHFrames();
  98   virtual void finalizeLoad(ObjSectionToIDMap &SectionMap);
  99 };
 100
 101 } // end namespace llvm
 102
 103 #endif