1 files changed, 315 insertions, 0 deletions
diff --git a/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
new file mode 100644
index 0000000..74b13d6
--- /dev/null
+++ b/contrib/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
@@ -0,0 +1,315 @@
+//===-- RuntimeDyldMachO.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 the MC-JIT runtime dynamic linker.
+//
+//===----------------------------------------------------------------------===//
+
+#include "RuntimeDyldMachO.h"
+#include "Targets/RuntimeDyldMachOAArch64.h"
+#include "Targets/RuntimeDyldMachOARM.h"
+#include "Targets/RuntimeDyldMachOI386.h"
+#include "Targets/RuntimeDyldMachOX86_64.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringRef.h"
+
+using namespace llvm;
+using namespace llvm::object;
+
+#define DEBUG_TYPE "dyld"
+
+namespace {
+
+class LoadedMachOObjectInfo
+    : public RuntimeDyld::LoadedObjectInfoHelper<LoadedMachOObjectInfo> {
+public:
+  LoadedMachOObjectInfo(RuntimeDyldImpl &RTDyld, unsigned BeginIdx,
+                        unsigned EndIdx)
+      : LoadedObjectInfoHelper(RTDyld, BeginIdx, EndIdx) {}
+
+  OwningBinary<ObjectFile>
+  getObjectForDebug(const ObjectFile &Obj) const override {
+    return OwningBinary<ObjectFile>();
+  }
+};
+
+}
+
+namespace llvm {
+
+int64_t RuntimeDyldMachO::memcpyAddend(const RelocationEntry &RE) const {
+  unsigned NumBytes = 1 << RE.Size;
+  uint8_t *Src = Sections[RE.SectionID].Address + RE.Offset;
+
+  return static_cast<int64_t>(readBytesUnaligned(Src, NumBytes));
+}
+
+RelocationValueRef RuntimeDyldMachO::getRelocationValueRef(
+    const ObjectFile &BaseTObj, const relocation_iterator &RI,
+    const RelocationEntry &RE, ObjSectionToIDMap &ObjSectionToID) {
+
+  const MachOObjectFile &Obj =
+      static_cast<const MachOObjectFile &>(BaseTObj);
+  MachO::any_relocation_info RelInfo =
+      Obj.getRelocation(RI->getRawDataRefImpl());
+  RelocationValueRef Value;
+
+  bool IsExternal = Obj.getPlainRelocationExternal(RelInfo);
+  if (IsExternal) {
+    symbol_iterator Symbol = RI->getSymbol();
+    ErrorOr<StringRef> TargetNameOrErr = Symbol->getName();
+    if (std::error_code EC = TargetNameOrErr.getError())
+      report_fatal_error(EC.message());
+    StringRef TargetName = *TargetNameOrErr;
+    RTDyldSymbolTable::const_iterator SI =
+      GlobalSymbolTable.find(TargetName.data());
+    if (SI != GlobalSymbolTable.end()) {
+      const auto &SymInfo = SI->second;
+      Value.SectionID = SymInfo.getSectionID();
+      Value.Offset = SymInfo.getOffset() + RE.Addend;
+    } else {
+      Value.SymbolName = TargetName.data();
+      Value.Offset = RE.Addend;
+    }
+  } else {
+    SectionRef Sec = Obj.getAnyRelocationSection(RelInfo);
+    bool IsCode = Sec.isText();
+    Value.SectionID = findOrEmitSection(Obj, Sec, IsCode, ObjSectionToID);
+    uint64_t Addr = Sec.getAddress();
+    Value.Offset = RE.Addend - Addr;
+  }
+
+  return Value;
+}
+
+void RuntimeDyldMachO::makeValueAddendPCRel(RelocationValueRef &Value,
+                                            const ObjectFile &BaseTObj,
+                                            const relocation_iterator &RI,
+                                            unsigned OffsetToNextPC) {
+  const MachOObjectFile &Obj =
+      static_cast<const MachOObjectFile &>(BaseTObj);
+  MachO::any_relocation_info RelInfo =
+      Obj.getRelocation(RI->getRawDataRefImpl());
+
+  bool IsPCRel = Obj.getAnyRelocationPCRel(RelInfo);
+  if (IsPCRel) {
+    ErrorOr<uint64_t> RelocAddr = RI->getAddress();
+    Value.Offset += *RelocAddr + OffsetToNextPC;
+  }
+}
+
+void RuntimeDyldMachO::dumpRelocationToResolve(const RelocationEntry &RE,
+                                               uint64_t Value) const {
+  const SectionEntry &Section = Sections[RE.SectionID];
+  uint8_t *LocalAddress = Section.Address + RE.Offset;
+  uint64_t FinalAddress = Section.LoadAddress + RE.Offset;
+
+  dbgs() << "resolveRelocation Section: " << RE.SectionID
+         << " LocalAddress: " << format("%p", LocalAddress)
+         << " FinalAddress: " << format("0x%016" PRIx64, FinalAddress)
+         << " Value: " << format("0x%016" PRIx64, Value) << " Addend: " << RE.Addend
+         << " isPCRel: " << RE.IsPCRel << " MachoType: " << RE.RelType
+         << " Size: " << (1 << RE.Size) << "\n";
+}
+
+section_iterator
+RuntimeDyldMachO::getSectionByAddress(const MachOObjectFile &Obj,
+                                      uint64_t Addr) {
+  section_iterator SI = Obj.section_begin();
+  section_iterator SE = Obj.section_end();
+
+  for (; SI != SE; ++SI) {
+    uint64_t SAddr = SI->getAddress();
+    uint64_t SSize = SI->getSize();
+    if ((Addr >= SAddr) && (Addr < SAddr + SSize))
+      return SI;
+  }
+
+  return SE;
+}
+
+
+// Populate __pointers section.
+void RuntimeDyldMachO::populateIndirectSymbolPointersSection(
+                                                    const MachOObjectFile &Obj,
+                                                    const SectionRef &PTSection,
+                                                    unsigned PTSectionID) {
+  assert(!Obj.is64Bit() &&
+         "Pointer table section not supported in 64-bit MachO.");
+
+  MachO::dysymtab_command DySymTabCmd = Obj.getDysymtabLoadCommand();
+  MachO::section Sec32 = Obj.getSection(PTSection.getRawDataRefImpl());
+  uint32_t PTSectionSize = Sec32.size;
+  unsigned FirstIndirectSymbol = Sec32.reserved1;
+  const unsigned PTEntrySize = 4;
+  unsigned NumPTEntries = PTSectionSize / PTEntrySize;
+  unsigned PTEntryOffset = 0;
+
+  assert((PTSectionSize % PTEntrySize) == 0 &&
+         "Pointers section does not contain a whole number of stubs?");
+
+  DEBUG(dbgs() << "Populating pointer table section "
+               << Sections[PTSectionID].Name
+               << ", Section ID " << PTSectionID << ", "
+               << NumPTEntries << " entries, " << PTEntrySize
+               << " bytes each:\n");
+
+  for (unsigned i = 0; i < NumPTEntries; ++i) {
+    unsigned SymbolIndex =
+      Obj.getIndirectSymbolTableEntry(DySymTabCmd, FirstIndirectSymbol + i);
+    symbol_iterator SI = Obj.getSymbolByIndex(SymbolIndex);
+    ErrorOr<StringRef> IndirectSymbolNameOrErr = SI->getName();
+    if (std::error_code EC = IndirectSymbolNameOrErr.getError())
+      report_fatal_error(EC.message());
+    StringRef IndirectSymbolName = *IndirectSymbolNameOrErr;
+    DEBUG(dbgs() << "  " << IndirectSymbolName << ": index " << SymbolIndex
+          << ", PT offset: " << PTEntryOffset << "\n");
+    RelocationEntry RE(PTSectionID, PTEntryOffset,
+                       MachO::GENERIC_RELOC_VANILLA, 0, false, 2);
+    addRelocationForSymbol(RE, IndirectSymbolName);
+    PTEntryOffset += PTEntrySize;
+  }
+}
+
+bool RuntimeDyldMachO::isCompatibleFile(const object::ObjectFile &Obj) const {
+  return Obj.isMachO();
+}
+
+template <typename Impl>
+void RuntimeDyldMachOCRTPBase<Impl>::finalizeLoad(const ObjectFile &Obj,
+                                                  ObjSectionToIDMap &SectionMap) {
+  unsigned EHFrameSID = RTDYLD_INVALID_SECTION_ID;
+  unsigned TextSID = RTDYLD_INVALID_SECTION_ID;
+  unsigned ExceptTabSID = RTDYLD_INVALID_SECTION_ID;
+
+  for (const auto &Section : Obj.sections()) {
+    StringRef Name;
+    Section.getName(Name);
+
+    // Force emission of the __text, __eh_frame, and __gcc_except_tab sections
+    // if they're present. Otherwise call down to the impl to handle other
+    // sections that have already been emitted.
+    if (Name == "__text")
+      TextSID = findOrEmitSection(Obj, Section, true, SectionMap);
+    else if (Name == "__eh_frame")
+      EHFrameSID = findOrEmitSection(Obj, Section, false, SectionMap);
+    else if (Name == "__gcc_except_tab")
+      ExceptTabSID = findOrEmitSection(Obj, Section, true, SectionMap);
+    else {
+      auto I = SectionMap.find(Section);
+      if (I != SectionMap.end())
+        impl().finalizeSection(Obj, I->second, Section);
+    }
+  }
+  UnregisteredEHFrameSections.push_back(
+    EHFrameRelatedSections(EHFrameSID, TextSID, ExceptTabSID));
+}
+
+template <typename Impl>
+unsigned char *RuntimeDyldMachOCRTPBase<Impl>::processFDE(unsigned char *P,
+                                                          int64_t DeltaForText,
+                                                          int64_t DeltaForEH) {
+  typedef typename Impl::TargetPtrT TargetPtrT;
+
+  DEBUG(dbgs() << "Processing FDE: Delta for text: " << DeltaForText
+               << ", Delta for EH: " << DeltaForEH << "\n");
+  uint32_t Length = readBytesUnaligned(P, 4);
+  P += 4;
+  unsigned char *Ret = P + Length;
+  uint32_t Offset = readBytesUnaligned(P, 4);
+  if (Offset == 0) // is a CIE
+    return Ret;
+
+  P += 4;
+  TargetPtrT FDELocation = readBytesUnaligned(P, sizeof(TargetPtrT));
+  TargetPtrT NewLocation = FDELocation - DeltaForText;
+  writeBytesUnaligned(NewLocation, P, sizeof(TargetPtrT));
+
+  P += sizeof(TargetPtrT);
+
+  // Skip the FDE address range
+  P += sizeof(TargetPtrT);
+
+  uint8_t Augmentationsize = *P;
+  P += 1;
+  if (Augmentationsize != 0) {
+    TargetPtrT LSDA = readBytesUnaligned(P, sizeof(TargetPtrT));
+    TargetPtrT NewLSDA = LSDA - DeltaForEH;
+    writeBytesUnaligned(NewLSDA, P, sizeof(TargetPtrT));
+  }
+
+  return Ret;
+}
+
+static int64_t computeDelta(SectionEntry *A, SectionEntry *B) {
+  int64_t ObjDistance =
+    static_cast<int64_t>(A->ObjAddress) - static_cast<int64_t>(B->ObjAddress);
+  int64_t MemDistance = A->LoadAddress - B->LoadAddress;
+  return ObjDistance - MemDistance;
+}
+
+template <typename Impl>
+void RuntimeDyldMachOCRTPBase<Impl>::registerEHFrames() {
+
+  for (int i = 0, e = UnregisteredEHFrameSections.size(); i != e; ++i) {
+    EHFrameRelatedSections &SectionInfo = UnregisteredEHFrameSections[i];
+    if (SectionInfo.EHFrameSID == RTDYLD_INVALID_SECTION_ID ||
+        SectionInfo.TextSID == RTDYLD_INVALID_SECTION_ID)
+      continue;
+    SectionEntry *Text = &Sections[SectionInfo.TextSID];
+    SectionEntry *EHFrame = &Sections[SectionInfo.EHFrameSID];
+    SectionEntry *ExceptTab = nullptr;
+    if (SectionInfo.ExceptTabSID != RTDYLD_INVALID_SECTION_ID)
+      ExceptTab = &Sections[SectionInfo.ExceptTabSID];
+
+    int64_t DeltaForText = computeDelta(Text, EHFrame);
+    int64_t DeltaForEH = 0;
+    if (ExceptTab)
+      DeltaForEH = computeDelta(ExceptTab, EHFrame);
+
+    unsigned char *P = EHFrame->Address;
+    unsigned char *End = P + EHFrame->Size;
+    do {
+      P = processFDE(P, DeltaForText, DeltaForEH);
+    } while (P != End);
+
+    MemMgr.registerEHFrames(EHFrame->Address, EHFrame->LoadAddress,
+                            EHFrame->Size);
+  }
+  UnregisteredEHFrameSections.clear();
+}
+
+std::unique_ptr<RuntimeDyldMachO>
+RuntimeDyldMachO::create(Triple::ArchType Arch,
+                         RuntimeDyld::MemoryManager &MemMgr,
+                         RuntimeDyld::SymbolResolver &Resolver) {
+  switch (Arch) {
+  default:
+    llvm_unreachable("Unsupported target for RuntimeDyldMachO.");
+    break;
+  case Triple::arm:
+    return make_unique<RuntimeDyldMachOARM>(MemMgr, Resolver);
+  case Triple::aarch64:
+    return make_unique<RuntimeDyldMachOAArch64>(MemMgr, Resolver);
+  case Triple::x86:
+    return make_unique<RuntimeDyldMachOI386>(MemMgr, Resolver);
+  case Triple::x86_64:
+    return make_unique<RuntimeDyldMachOX86_64>(MemMgr, Resolver);
+  }
+}
+
+std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
+RuntimeDyldMachO::loadObject(const object::ObjectFile &O) {
+  unsigned SectionStartIdx, SectionEndIdx;
+  std::tie(SectionStartIdx, SectionEndIdx) = loadObjectImpl(O);
+  return llvm::make_unique<LoadedMachOObjectInfo>(*this, SectionStartIdx,
+                                                  SectionEndIdx);
+}
+
+} // end namespace llvm