llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldCOFF.cpp

//===-- RuntimeDyldCOFF.cpp - Run-time dynamic linker for MC-JIT -*- C++ -*-==//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Implementation of COFF support for the MC-JIT runtime dynamic linker.
//
//===----------------------------------------------------------------------===//

#include "RuntimeDyldCOFF.h"
#include "Targets/RuntimeDyldCOFFX86_64.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Object/ObjectFile.h"

using namespace llvm;
using namespace llvm::object;

#define DEBUG_TYPE "dyld"

namespace {

class LoadedCOFFObjectInfo : public RuntimeDyld::LoadedObjectInfo {
public:
  LoadedCOFFObjectInfo(RuntimeDyldImpl &RTDyld, unsigned BeginIdx,
                       unsigned EndIdx)
      : RuntimeDyld::LoadedObjectInfo(RTDyld, BeginIdx, EndIdx) {}

  OwningBinary<ObjectFile>
  getObjectForDebug(const ObjectFile &Obj) const override {
    return OwningBinary<ObjectFile>();
  }

  RuntimeDyld::LoadedObjectInfo *clone() const { return new LoadedCOFFObjectInfo(*this); }
};
}

namespace llvm {

std::unique_ptr<RuntimeDyldCOFF>
llvm::RuntimeDyldCOFF::create(Triple::ArchType Arch,
                              RuntimeDyld::MemoryManager &MemMgr,
                              RuntimeDyld::SymbolResolver &Resolver) {
  switch (Arch) {
  default:
    llvm_unreachable("Unsupported target for RuntimeDyldCOFF.");
    break;
  case Triple::x86_64:
    return make_unique<RuntimeDyldCOFFX86_64>(MemMgr, Resolver);
  }
}

std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
RuntimeDyldCOFF::loadObject(const object::ObjectFile &O) {
  unsigned SectionStartIdx, SectionEndIdx;
  std::tie(SectionStartIdx, SectionEndIdx) = loadObjectImpl(O);
  return llvm::make_unique<LoadedCOFFObjectInfo>(*this, SectionStartIdx,
                                                 SectionEndIdx);
}

uint64_t RuntimeDyldCOFF::getSymbolOffset(const SymbolRef &Sym) {
  uint64_t Address;
  if (Sym.getAddress(Address))
    return UnknownAddressOrSize;

  if (Address == UnknownAddressOrSize)
    return UnknownAddressOrSize;

  const ObjectFile *Obj = Sym.getObject();
  section_iterator SecI(Obj->section_end());
  if (Sym.getSection(SecI))
    return UnknownAddressOrSize;

  if (SecI == Obj->section_end())
    return UnknownAddressOrSize;

  uint64_t SectionAddress = SecI->getAddress();
  return Address - SectionAddress;
}

bool RuntimeDyldCOFF::isCompatibleFile(const object::ObjectFile &Obj) const {
  return Obj.isCOFF();
}

} // namespace llvm