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 "ObjectImageCommon.h"
  18 #include "RuntimeDyldImpl.h"
  19 #include "llvm/ADT/IndexedMap.h"
  20 #include "llvm/Object/MachO.h"
  21 #include "llvm/Support/Format.h"
  22
  23 using namespace llvm;
  24 using namespace llvm::object;
  25
  26
  27 namespace llvm {
  28 class RuntimeDyldMachO : public RuntimeDyldImpl {
  29   bool resolveI386Relocation(uint8_t *LocalAddress,
  30                              uint64_t FinalAddress,
  31                              uint64_t Value,
  32                              bool isPCRel,
  33                              unsigned Type,
  34                              unsigned Size,
  35                              int64_t Addend);
  36   bool resolveX86_64Relocation(uint8_t *LocalAddress,
  37                                uint64_t FinalAddress,
  38                                uint64_t Value,
  39                                bool isPCRel,
  40                                unsigned Type,
  41                                unsigned Size,
  42                                int64_t Addend);
  43   bool resolveARMRelocation(uint8_t *LocalAddress,
  44                             uint64_t FinalAddress,
  45                             uint64_t Value,
  46                             bool isPCRel,
  47                             unsigned Type,
  48                             unsigned Size,
  49                             int64_t Addend);
  50
  51   void resolveRelocation(const SectionEntry &Section,
  52                          uint64_t Offset,
  53                          uint64_t Value,
  54                          uint32_t Type,
  55                          int64_t Addend,
  56                          bool isPCRel,
  57                          unsigned Size);
  58
  59   unsigned getMaxStubSize() override {
  60     if (Arch == Triple::arm || Arch == Triple::thumb)
  61       return 8; // 32-bit instruction and 32-bit address
  62     else if (Arch == Triple::x86_64)
  63       return 8; // GOT entry
  64     else
  65       return 0;
  66   }
  67
  68   unsigned getStubAlignment() override {
  69     return 1;
  70   }
  71
  72   struct EHFrameRelatedSections {
  73     EHFrameRelatedSections() : EHFrameSID(RTDYLD_INVALID_SECTION_ID),
  74                                TextSID(RTDYLD_INVALID_SECTION_ID),
  75                                ExceptTabSID(RTDYLD_INVALID_SECTION_ID) {}
  76     EHFrameRelatedSections(SID EH, SID T, SID Ex)
  77       : EHFrameSID(EH), TextSID(T), ExceptTabSID(Ex) {}
  78     SID EHFrameSID;
  79     SID TextSID;
  80     SID ExceptTabSID;
  81   };
  82
  83   // When a module is loaded we save the SectionID of the EH frame section
  84   // in a table until we receive a request to register all unregistered
  85   // EH frame sections with the memory manager.
  86   SmallVector<EHFrameRelatedSections, 2> UnregisteredEHFrameSections;
  87 public:
  88   RuntimeDyldMachO(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
  89
  90   void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override;
  91   relocation_iterator
  92   processRelocationRef(unsigned SectionID, relocation_iterator RelI,
  93                        ObjectImage &Obj, ObjSectionToIDMap &ObjSectionToID,
  94                        const SymbolTableMap &Symbols, StubMap &Stubs) override;
  95   bool isCompatibleFormat(const ObjectBuffer *Buffer) const override;
  96   bool isCompatibleFile(const object::ObjectFile *Obj) const override;
  97   void registerEHFrames() override;
  98   void finalizeLoad(ObjSectionToIDMap &SectionMap) override;
  99
 100
 101   static ObjectImage *createObjectImage(ObjectBuffer *InputBuffer) {
 102     return new ObjectImageCommon(InputBuffer);
 103   }
 104
 105   static ObjectImage *createObjectImageFromFile(object::ObjectFile *InputObject) {
 106     return new ObjectImageCommon(InputObject);
 107   }
 108 };
 109
 110 } // end namespace llvm
 111
 112 #endif