/build/llvm-toolchain-snapshot-7~svn338205/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp

Bug Summary

File:	lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
Warning:	line 332, column 11 2nd function call argument is an uninitialized value
Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name RuntimeDyld.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -mrelocation-model pic -pic-level 2 -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn338205/build-llvm/lib/ExecutionEngine/RuntimeDyld -I /build/llvm-toolchain-snapshot-7~svn338205/lib/ExecutionEngine/RuntimeDyld -I /build/llvm-toolchain-snapshot-7~svn338205/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn338205/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/x86_64-linux-gnu/c++/8 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/x86_64-linux-gnu/c++/8 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/include -internal-externc-isystem /usr/lib/gcc/x86_64-linux-gnu/8/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn338205/build-llvm/lib/ExecutionEngine/RuntimeDyld -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-07-29-043837-17923-1 -x c++ /build/llvm-toolchain-snapshot-7~svn338205/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp -faddrsig
1//===-- RuntimeDyld.cpp - 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// Implementation of the MC-JIT runtime dynamic linker.
11//
12//===----------------------------------------------------------------------===//

14#include "llvm/ExecutionEngine/RuntimeDyld.h"
15#include "RuntimeDyldCOFF.h"
16#include "RuntimeDyldCheckerImpl.h"
17#include "RuntimeDyldELF.h"
18#include "RuntimeDyldImpl.h"
19#include "RuntimeDyldMachO.h"
20#include "llvm/Object/COFF.h"
21#include "llvm/Object/ELFObjectFile.h"
22#include "llvm/Support/ManagedStatic.h"
23#include "llvm/Support/MathExtras.h"
24#include "llvm/Support/MutexGuard.h"

26using namespace llvm;
27using namespace llvm::object;

29#define DEBUG_TYPE"dyld" "dyld"

31namespace {

33enum RuntimeDyldErrorCode {
GenericRTDyldError = 1
35};

37// FIXME: This class is only here to support the transition to llvm::Error. It
38// will be removed once this transition is complete. Clients should prefer to
39// deal with the Error value directly, rather than converting to error_code.
40class RuntimeDyldErrorCategory : public std::error_category {
41public:
const char *name() const noexcept override { return "runtimedyld"; }

std::string message(int Condition) const override {
  switch (static_cast<RuntimeDyldErrorCode>(Condition)) {
    case GenericRTDyldError: return "Generic RuntimeDyld error";
  }
  llvm_unreachable("Unrecognized RuntimeDyldErrorCode")::llvm::llvm_unreachable_internal("Unrecognized RuntimeDyldErrorCode"
, "/build/llvm-toolchain-snapshot-7~svn338205/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp"
, 48);
}
50};

52static ManagedStatic<RuntimeDyldErrorCategory> RTDyldErrorCategory;

54}

56char RuntimeDyldError::ID = 0;

58void RuntimeDyldError::log(raw_ostream &OS) const {
OS << ErrMsg << "\n";
60}

62std::error_code RuntimeDyldError::convertToErrorCode() const {
return std::error_code(GenericRTDyldError, *RTDyldErrorCategory);
64}

66// Empty out-of-line virtual destructor as the key function.
67RuntimeDyldImpl::~RuntimeDyldImpl() {}

69// Pin LoadedObjectInfo's vtables to this file.
70void RuntimeDyld::LoadedObjectInfo::anchor() {}

72namespace llvm {

74void RuntimeDyldImpl::registerEHFrames() {}

76void RuntimeDyldImpl::deregisterEHFrames() {
MemMgr.deregisterEHFrames();
78}

80#ifndef NDEBUG
81static void dumpSectionMemory(const SectionEntry &S, StringRef State) {
dbgs() << "----- Contents of section " << S.getName() << " " << State
       << " -----";

if (S.getAddress() == nullptr) {
  dbgs() << "\n          <section not emitted>\n";
  return;
}

const unsigned ColsPerRow = 16;

uint8_t *DataAddr = S.getAddress();
uint64_t LoadAddr = S.getLoadAddress();

unsigned StartPadding = LoadAddr & (ColsPerRow - 1);
unsigned BytesRemaining = S.getSize();

if (StartPadding) {
  dbgs() << "\n" << format("0x%016" PRIx64"l" "x",
                           LoadAddr & ~(uint64_t)(ColsPerRow - 1)) << ":";
  while (StartPadding--)
    dbgs() << "   ";
}

while (BytesRemaining > 0) {
  if ((LoadAddr & (ColsPerRow - 1)) == 0)
    dbgs() << "\n" << format("0x%016" PRIx64"l" "x", LoadAddr) << ":";

  dbgs() << " " << format("%02x", *DataAddr);

  ++DataAddr;
  ++LoadAddr;
  --BytesRemaining;
}

dbgs() << "\n";
117}
118#endif

120// Resolve the relocations for all symbols we currently know about.
121void RuntimeDyldImpl::resolveRelocations() {
MutexGuard locked(lock);

// Print out the sections prior to relocation.
LLVM_DEBUG(for (int i = 0, e = Sections.size(); i != e; ++i)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { for (int i = 0, e = Sections.size(); i != e; ++i)
 dumpSectionMemory(Sections[i], "before relocations");; } } while
 (false)
               dumpSectionMemory(Sections[i], "before relocations");)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { for (int i = 0, e = Sections.size(); i != e; ++i)
 dumpSectionMemory(Sections[i], "before relocations");; } } while
 (false);

// First, resolve relocations associated with external symbols.
if (auto Err = resolveExternalSymbols()) {
  HasError = true;
  ErrorStr = toString(std::move(Err));
}

// Iterate over all outstanding relocations
for (auto it = Relocations.begin(), e = Relocations.end(); it != e; ++it) {
  // The Section here (Sections[i]) refers to the section in which the
  // symbol for the relocation is located.  The SectionID in the relocation
  // entry provides the section to which the relocation will be applied.
  int Idx = it->first;
  uint64_t Addr = Sections[Idx].getLoadAddress();
  LLVM_DEBUG(dbgs() << "Resolving relocations Section #" << Idx << "\t"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Resolving relocations Section #"
 << Idx << "\t" << format("%p", (uintptr_t)
Addr) << "\n"; } } while (false)
                    << format("%p", (uintptr_t)Addr) << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Resolving relocations Section #"
 << Idx << "\t" << format("%p", (uintptr_t)
Addr) << "\n"; } } while (false);
  resolveRelocationList(it->second, Addr);
}
Relocations.clear();

// Print out sections after relocation.
LLVM_DEBUG(for (int i = 0, e = Sections.size(); i != e; ++i)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { for (int i = 0, e = Sections.size(); i != e; ++i)
 dumpSectionMemory(Sections[i], "after relocations");; } } while
 (false)
               dumpSectionMemory(Sections[i], "after relocations");)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { for (int i = 0, e = Sections.size(); i != e; ++i)
 dumpSectionMemory(Sections[i], "after relocations");; } } while
 (false);
150}

152void RuntimeDyldImpl::mapSectionAddress(const void *LocalAddress,
                                      uint64_t TargetAddress) {
MutexGuard locked(lock);
for (unsigned i = 0, e = Sections.size(); i != e; ++i) {
  if (Sections[i].getAddress() == LocalAddress) {
    reassignSectionAddress(i, TargetAddress);
    return;
  }
}
llvm_unreachable("Attempting to remap address of unknown section!")::llvm::llvm_unreachable_internal("Attempting to remap address of unknown section!"
, "/build/llvm-toolchain-snapshot-7~svn338205/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp"
, 161);
162}

164static Error getOffset(const SymbolRef &Sym, SectionRef Sec,
                     uint64_t &Result) {
Expected<uint64_t> AddressOrErr = Sym.getAddress();
if (!AddressOrErr)
21
←
Taking true branch→
  return AddressOrErr.takeError();
Result = *AddressOrErr - Sec.getAddress();
return Error::success();
171}
22
←
Returning without writing to 'Result'→

173Expected<RuntimeDyldImpl::ObjSectionToIDMap>
174RuntimeDyldImpl::loadObjectImpl(const object::ObjectFile &Obj) {
MutexGuard locked(lock);

// Save information about our target
Arch = (Triple::ArchType)Obj.getArch();
IsTargetLittleEndian = Obj.isLittleEndian();
setMipsABI(Obj);

// Compute the memory size required to load all sections to be loaded
// and pass this information to the memory manager
if (MemMgr.needsToReserveAllocationSpace()) {
1
Assuming the condition is false→
2
←
Taking false branch→
  uint64_t CodeSize = 0, RODataSize = 0, RWDataSize = 0;
  uint32_t CodeAlign = 1, RODataAlign = 1, RWDataAlign = 1;
  if (auto Err = computeTotalAllocSize(Obj,
                                       CodeSize, CodeAlign,
                                       RODataSize, RODataAlign,
                                       RWDataSize, RWDataAlign))
    return std::move(Err);
  MemMgr.reserveAllocationSpace(CodeSize, CodeAlign, RODataSize, RODataAlign,
                                RWDataSize, RWDataAlign);
}

// Used sections from the object file
ObjSectionToIDMap LocalSections;

// Common symbols requiring allocation, with their sizes and alignments
CommonSymbolList CommonSymbolsToAllocate;

uint64_t CommonSize = 0;
uint32_t CommonAlign = 0;

// First, collect all weak and common symbols. We need to know if stronger
// definitions occur elsewhere.
JITSymbolResolver::LookupFlagsResult SymbolFlags;
{
  JITSymbolResolver::LookupSet Symbols;
  for (auto &Sym : Obj.symbols()) {
    uint32_t Flags = Sym.getFlags();
    if ((Flags & SymbolRef::SF_Common) || (Flags & SymbolRef::SF_Weak)) {
      // Get symbol name.
      if (auto NameOrErr = Sym.getName())
        Symbols.insert(*NameOrErr);
      else
        return NameOrErr.takeError();
    }
  }

  if (auto FlagsResultOrErr = Resolver.lookupFlags(Symbols))
3
←
Taking true branch→
    SymbolFlags = std::move(*FlagsResultOrErr);
  else
    return FlagsResultOrErr.takeError();
}

// Parse symbols
LLVM_DEBUG(dbgs() << "Parse symbols:\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Parse symbols:\n"; } } while (false
);
for (symbol_iterator I = Obj.symbol_begin(), E = Obj.symbol_end(); I != E;
4
←
Loop condition is true.  Entering loop body→
     ++I) {
  uint32_t Flags = I->getFlags();

  // Skip undefined symbols.
  if (Flags & SymbolRef::SF_Undefined)
5
←
Assuming the condition is false→
6
←
Taking false branch→
    continue;

  // Get the symbol type.
  object::SymbolRef::Type SymType;
  if (auto SymTypeOrErr = I->getType())
7
←
Taking true branch→
    SymType = *SymTypeOrErr;
  else
    return SymTypeOrErr.takeError();

  // Get symbol name.
  StringRef Name;
  if (auto NameOrErr = I->getName())
8
←
Taking true branch→
    Name = *NameOrErr;
  else
    return NameOrErr.takeError();

  // Compute JIT symbol flags.
  JITSymbolFlags JITSymFlags = getJITSymbolFlags(*I);

  // If this is a weak definition, check to see if there's a strong one.
  // If there is, skip this symbol (we won't be providing it: the strong
  // definition will). If there's no strong definition, make this definition
  // strong.
  if (JITSymFlags.isWeak() || JITSymFlags.isCommon()) {
9
←
Taking false branch→
    // First check whether there's already a definition in this instance.
    // FIXME: Override existing weak definitions with strong ones.
    if (GlobalSymbolTable.count(Name))
      continue;

    // Then check whether we found flags for an existing symbol during the
    // flags lookup earlier.
    auto FlagsI = SymbolFlags.find(Name);
    if (FlagsI == SymbolFlags.end() ||
        (JITSymFlags.isWeak() && !FlagsI->second.isStrong()) ||
        (JITSymFlags.isCommon() && FlagsI->second.isCommon())) {
      if (JITSymFlags.isWeak())
        JITSymFlags &= ~JITSymbolFlags::Weak;
      if (JITSymFlags.isCommon()) {
        JITSymFlags &= ~JITSymbolFlags::Common;
        uint32_t Align = I->getAlignment();
        uint64_t Size = I->getCommonSize();
        if (!CommonAlign)
          CommonAlign = Align;
        CommonSize += alignTo(CommonSize, Align) + Size;
        CommonSymbolsToAllocate.push_back(*I);
      }
    } else
      continue;
  }

  if (Flags & SymbolRef::SF_Absolute &&
10
←
Assuming the condition is false→
      SymType != object::SymbolRef::ST_File) {
    uint64_t Addr = 0;
    if (auto AddrOrErr = I->getAddress())
      Addr = *AddrOrErr;
    else
      return AddrOrErr.takeError();

    unsigned SectionID = AbsoluteSymbolSection;

    LLVM_DEBUG(dbgs() << "\tType: " << SymType << " (absolute) Name: " << Namedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "\tType: " << SymType <<
 " (absolute) Name: " << Name << " SID: " <<
 SectionID << " Offset: " << format("%p", (uintptr_t
)Addr) << " flags: " << Flags << "\n"; } } while
 (false)
                      << " SID: " << SectionIDdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "\tType: " << SymType <<
 " (absolute) Name: " << Name << " SID: " <<
 SectionID << " Offset: " << format("%p", (uintptr_t
)Addr) << " flags: " << Flags << "\n"; } } while
 (false)
                      << " Offset: " << format("%p", (uintptr_t)Addr)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "\tType: " << SymType <<
 " (absolute) Name: " << Name << " SID: " <<
 SectionID << " Offset: " << format("%p", (uintptr_t
)Addr) << " flags: " << Flags << "\n"; } } while
 (false)
                      << " flags: " << Flags << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "\tType: " << SymType <<
 " (absolute) Name: " << Name << " SID: " <<
 SectionID << " Offset: " << format("%p", (uintptr_t
)Addr) << " flags: " << Flags << "\n"; } } while
 (false);
    GlobalSymbolTable[Name] = SymbolTableEntry(SectionID, Addr, JITSymFlags);
  } else if (SymType == object::SymbolRef::ST_Function ||
11
←
Assuming 'SymType' is not equal to ST_Function→
15
←
Taking true branch→
             SymType == object::SymbolRef::ST_Data ||
12
←
Assuming 'SymType' is not equal to ST_Data→
             SymType == object::SymbolRef::ST_Unknown ||
13
←
Assuming 'SymType' is not equal to ST_Unknown→
             SymType == object::SymbolRef::ST_Other) {
14
←
Assuming 'SymType' is equal to ST_Other→

    section_iterator SI = Obj.section_end();
    if (auto SIOrErr = I->getSection())
16
←
Taking true branch→
      SI = *SIOrErr;
    else
      return SIOrErr.takeError();

    if (SI == Obj.section_end())
17
←
Assuming the condition is false→
18
←
Taking false branch→
      continue;

    // Get symbol offset.
    uint64_t SectOffset;
19
←
'SectOffset' declared without an initial value→
    if (auto Err = getOffset(*I, *SI, SectOffset))
20
←
Calling 'getOffset'→
23
←
Returning from 'getOffset'→
24
←
Taking false branch→
      return std::move(Err);

    bool IsCode = SI->isText();
    unsigned SectionID;
    if (auto SectionIDOrErr =
25
←
Taking true branch→
            findOrEmitSection(Obj, *SI, IsCode, LocalSections))
      SectionID = *SectionIDOrErr;
    else
      return SectionIDOrErr.takeError();

    LLVM_DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Namedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "\tType: " << SymType <<
 " Name: " << Name << " SID: " << SectionID
 << " Offset: " << format("%p", (uintptr_t)SectOffset
) << " flags: " << Flags << "\n"; } } while
 (false)
                      << " SID: " << SectionIDdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "\tType: " << SymType <<
 " Name: " << Name << " SID: " << SectionID
 << " Offset: " << format("%p", (uintptr_t)SectOffset
) << " flags: " << Flags << "\n"; } } while
 (false)
                      << " Offset: " << format("%p", (uintptr_t)SectOffset)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "\tType: " << SymType <<
 " Name: " << Name << " SID: " << SectionID
 << " Offset: " << format("%p", (uintptr_t)SectOffset
) << " flags: " << Flags << "\n"; } } while
 (false)
                      << " flags: " << Flags << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "\tType: " << SymType <<
 " Name: " << Name << " SID: " << SectionID
 << " Offset: " << format("%p", (uintptr_t)SectOffset
) << " flags: " << Flags << "\n"; } } while
 (false);
    GlobalSymbolTable[Name] =
        SymbolTableEntry(SectionID, SectOffset, JITSymFlags);
26
←
2nd function call argument is an uninitialized value
  }
}

// Allocate common symbols
if (auto Err = emitCommonSymbols(Obj, CommonSymbolsToAllocate, CommonSize,
                                 CommonAlign))
  return std::move(Err);

// Parse and process relocations
LLVM_DEBUG(dbgs() << "Parse relocations:\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Parse relocations:\n"; } } while
 (false);
for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end();
     SI != SE; ++SI) {
  StubMap Stubs;
  section_iterator RelocatedSection = SI->getRelocatedSection();

  if (RelocatedSection == SE)
    continue;

  relocation_iterator I = SI->relocation_begin();
  relocation_iterator E = SI->relocation_end();

  if (I == E && !ProcessAllSections)
    continue;

  bool IsCode = RelocatedSection->isText();
  unsigned SectionID = 0;
  if (auto SectionIDOrErr = findOrEmitSection(Obj, *RelocatedSection, IsCode,
                                              LocalSections))
    SectionID = *SectionIDOrErr;
  else
    return SectionIDOrErr.takeError();

  LLVM_DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "\tSectionID: " << SectionID
 << "\n"; } } while (false);

  for (; I != E;)
    if (auto IOrErr = processRelocationRef(SectionID, I, Obj, LocalSections, Stubs))
      I = *IOrErr;
    else
      return IOrErr.takeError();

  // If there is an attached checker, notify it about the stubs for this
  // section so that they can be verified.
  if (Checker)
    Checker->registerStubMap(Obj.getFileName(), SectionID, Stubs);
}

// Give the subclasses a chance to tie-up any loose ends.
if (auto Err = finalizeLoad(Obj, LocalSections))
  return std::move(Err);

383//   for (auto E : LocalSections)
384//     llvm::dbgs() << "Added: " << E.first.getRawDataRefImpl() << " -> " << E.second << "\n";

return LocalSections;
387}

389// A helper method for computeTotalAllocSize.
390// Computes the memory size required to allocate sections with the given sizes,
391// assuming that all sections are allocated with the given alignment
392static uint64_t
393computeAllocationSizeForSections(std::vector<uint64_t> &SectionSizes,
                               uint64_t Alignment) {
uint64_t TotalSize = 0;
for (size_t Idx = 0, Cnt = SectionSizes.size(); Idx < Cnt; Idx++) {
  uint64_t AlignedSize =
      (SectionSizes[Idx] + Alignment - 1) / Alignment * Alignment;
  TotalSize += AlignedSize;
}
return TotalSize;
402}

404static bool isRequiredForExecution(const SectionRef Section) {
const ObjectFile *Obj = Section.getObject();
if (isa<object::ELFObjectFileBase>(Obj))
  return ELFSectionRef(Section).getFlags() & ELF::SHF_ALLOC;
if (auto *COFFObj = dyn_cast<object::COFFObjectFile>(Obj)) {
  const coff_section *CoffSection = COFFObj->getCOFFSection(Section);
  // Avoid loading zero-sized COFF sections.
  // In PE files, VirtualSize gives the section size, and SizeOfRawData
  // may be zero for sections with content. In Obj files, SizeOfRawData
  // gives the section size, and VirtualSize is always zero. Hence
  // the need to check for both cases below.
  bool HasContent =
      (CoffSection->VirtualSize > 0) || (CoffSection->SizeOfRawData > 0);
  bool IsDiscardable =
      CoffSection->Characteristics &
      (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_LNK_INFO);
  return HasContent && !IsDiscardable;
}

assert(isa<MachOObjectFile>(Obj))(static_cast <bool> (isa<MachOObjectFile>(Obj)) ?
 void (0) : __assert_fail ("isa<MachOObjectFile>(Obj)",
 "/build/llvm-toolchain-snapshot-7~svn338205/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp"
, 423, __extension__ __PRETTY_FUNCTION__));
return true;
425}

427static bool isReadOnlyData(const SectionRef Section) {
const ObjectFile *Obj = Section.getObject();
if (isa<object::ELFObjectFileBase>(Obj))
  return !(ELFSectionRef(Section).getFlags() &
           (ELF::SHF_WRITE | ELF::SHF_EXECINSTR));
if (auto *COFFObj = dyn_cast<object::COFFObjectFile>(Obj))
  return ((COFFObj->getCOFFSection(Section)->Characteristics &
           (COFF::IMAGE_SCN_CNT_INITIALIZED_DATA
           | COFF::IMAGE_SCN_MEM_READ
           | COFF::IMAGE_SCN_MEM_WRITE))
           ==
           (COFF::IMAGE_SCN_CNT_INITIALIZED_DATA
           | COFF::IMAGE_SCN_MEM_READ));

assert(isa<MachOObjectFile>(Obj))(static_cast <bool> (isa<MachOObjectFile>(Obj)) ?
 void (0) : __assert_fail ("isa<MachOObjectFile>(Obj)",
 "/build/llvm-toolchain-snapshot-7~svn338205/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp"
, 441, __extension__ __PRETTY_FUNCTION__));
return false;
443}

445static bool isZeroInit(const SectionRef Section) {
const ObjectFile *Obj = Section.getObject();
if (isa<object::ELFObjectFileBase>(Obj))
  return ELFSectionRef(Section).getType() == ELF::SHT_NOBITS;
if (auto *COFFObj = dyn_cast<object::COFFObjectFile>(Obj))
  return COFFObj->getCOFFSection(Section)->Characteristics &
          COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;

auto *MachO = cast<MachOObjectFile>(Obj);
unsigned SectionType = MachO->getSectionType(Section);
return SectionType == MachO::S_ZEROFILL ||
       SectionType == MachO::S_GB_ZEROFILL;
457}

459// Compute an upper bound of the memory size that is required to load all
460// sections
461Error RuntimeDyldImpl::computeTotalAllocSize(const ObjectFile &Obj,
                                           uint64_t &CodeSize,
                                           uint32_t &CodeAlign,
                                           uint64_t &RODataSize,
                                           uint32_t &RODataAlign,
                                           uint64_t &RWDataSize,
                                           uint32_t &RWDataAlign) {
// Compute the size of all sections required for execution
std::vector<uint64_t> CodeSectionSizes;
std::vector<uint64_t> ROSectionSizes;
std::vector<uint64_t> RWSectionSizes;

// Collect sizes of all sections to be loaded;
// also determine the max alignment of all sections
for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end();
     SI != SE; ++SI) {
  const SectionRef &Section = *SI;

  bool IsRequired = isRequiredForExecution(Section) || ProcessAllSections;

  // Consider only the sections that are required to be loaded for execution
  if (IsRequired) {
    uint64_t DataSize = Section.getSize();
    uint64_t Alignment64 = Section.getAlignment();
    unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
    bool IsCode = Section.isText();
    bool IsReadOnly = isReadOnlyData(Section);

    StringRef Name;
    if (auto EC = Section.getName(Name))
      return errorCodeToError(EC);

    uint64_t StubBufSize = computeSectionStubBufSize(Obj, Section);
    uint64_t SectionSize = DataSize + StubBufSize;

    // The .eh_frame section (at least on Linux) needs an extra four bytes
    // padded
    // with zeroes added at the end.  For MachO objects, this section has a
    // slightly different name, so this won't have any effect for MachO
    // objects.
    if (Name == ".eh_frame")
      SectionSize += 4;

    if (!SectionSize)
      SectionSize = 1;

    if (IsCode) {
      CodeAlign = std::max(CodeAlign, Alignment);
      CodeSectionSizes.push_back(SectionSize);
    } else if (IsReadOnly) {
      RODataAlign = std::max(RODataAlign, Alignment);
      ROSectionSizes.push_back(SectionSize);
    } else {
      RWDataAlign = std::max(RWDataAlign, Alignment);
      RWSectionSizes.push_back(SectionSize);
    }
  }
}

// Compute Global Offset Table size. If it is not zero we
// also update alignment, which is equal to a size of a
// single GOT entry.
if (unsigned GotSize = computeGOTSize(Obj)) {
  RWSectionSizes.push_back(GotSize);
  RWDataAlign = std::max<uint32_t>(RWDataAlign, getGOTEntrySize());
}

// Compute the size of all common symbols
uint64_t CommonSize = 0;
uint32_t CommonAlign = 1;
for (symbol_iterator I = Obj.symbol_begin(), E = Obj.symbol_end(); I != E;
     ++I) {
  uint32_t Flags = I->getFlags();
  if (Flags & SymbolRef::SF_Common) {
    // Add the common symbols to a list.  We'll allocate them all below.
    uint64_t Size = I->getCommonSize();
    uint32_t Align = I->getAlignment();
    // If this is the first common symbol, use its alignment as the alignment
    // for the common symbols section.
    if (CommonSize == 0)
      CommonAlign = Align;
    CommonSize = alignTo(CommonSize, Align) + Size;
  }
}
if (CommonSize != 0) {
  RWSectionSizes.push_back(CommonSize);
  RWDataAlign = std::max(RWDataAlign, CommonAlign);
}

// Compute the required allocation space for each different type of sections
// (code, read-only data, read-write data) assuming that all sections are
// allocated with the max alignment. Note that we cannot compute with the
// individual alignments of the sections, because then the required size
// depends on the order, in which the sections are allocated.
CodeSize = computeAllocationSizeForSections(CodeSectionSizes, CodeAlign);
RODataSize = computeAllocationSizeForSections(ROSectionSizes, RODataAlign);
RWDataSize = computeAllocationSizeForSections(RWSectionSizes, RWDataAlign);

return Error::success();
560}

562// compute GOT size
563unsigned RuntimeDyldImpl::computeGOTSize(const ObjectFile &Obj) {
size_t GotEntrySize = getGOTEntrySize();
if (!GotEntrySize)
  return 0;

size_t GotSize = 0;
for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end();
     SI != SE; ++SI) {

  for (const RelocationRef &Reloc : SI->relocations())
    if (relocationNeedsGot(Reloc))
      GotSize += GotEntrySize;
}

return GotSize;
578}

580// compute stub buffer size for the given section
581unsigned RuntimeDyldImpl::computeSectionStubBufSize(const ObjectFile &Obj,
                                                  const SectionRef &Section) {
unsigned StubSize = getMaxStubSize();
if (StubSize == 0) {
  return 0;
}
// FIXME: this is an inefficient way to handle this. We should computed the
// necessary section allocation size in loadObject by walking all the sections
// once.
unsigned StubBufSize = 0;
for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end();
     SI != SE; ++SI) {
  section_iterator RelSecI = SI->getRelocatedSection();
  if (!(RelSecI == Section))
    continue;

  for (const RelocationRef &Reloc : SI->relocations())
    if (relocationNeedsStub(Reloc))
      StubBufSize += StubSize;
}

// Get section data size and alignment
uint64_t DataSize = Section.getSize();
uint64_t Alignment64 = Section.getAlignment();

// Add stubbuf size alignment
unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
unsigned StubAlignment = getStubAlignment();
unsigned EndAlignment = (DataSize | Alignment) & -(DataSize | Alignment);
if (StubAlignment > EndAlignment)
  StubBufSize += StubAlignment - EndAlignment;
return StubBufSize;
613}

615uint64_t RuntimeDyldImpl::readBytesUnaligned(uint8_t *Src,
                                           unsigned Size) const {
uint64_t Result = 0;
if (IsTargetLittleEndian) {
  Src += Size - 1;
  while (Size--)
    Result = (Result << 8) | *Src--;
} else
  while (Size--)
    Result = (Result << 8) | *Src++;

return Result;
627}

629void RuntimeDyldImpl::writeBytesUnaligned(uint64_t Value, uint8_t *Dst,
                                        unsigned Size) const {
if (IsTargetLittleEndian) {
  while (Size--) {
    *Dst++ = Value & 0xFF;
    Value >>= 8;
  }
} else {
  Dst += Size - 1;
  while (Size--) {
    *Dst-- = Value & 0xFF;
    Value >>= 8;
  }
}
643}

645JITSymbolFlags RuntimeDyldImpl::getJITSymbolFlags(const BasicSymbolRef &SR) {
return JITSymbolFlags::fromObjectSymbol(SR);
647}

649Error RuntimeDyldImpl::emitCommonSymbols(const ObjectFile &Obj,
                                       CommonSymbolList &SymbolsToAllocate,
                                       uint64_t CommonSize,
                                       uint32_t CommonAlign) {
if (SymbolsToAllocate.empty())
  return Error::success();

// Allocate memory for the section
unsigned SectionID = Sections.size();
uint8_t *Addr = MemMgr.allocateDataSection(CommonSize, CommonAlign, SectionID,
                                           "<common symbols>", false);
if (!Addr)
  report_fatal_error("Unable to allocate memory for common symbols!");
uint64_t Offset = 0;
Sections.push_back(
    SectionEntry("<common symbols>", Addr, CommonSize, CommonSize, 0));
memset(Addr, 0, CommonSize);

LLVM_DEBUG(dbgs() << "emitCommonSection SectionID: " << SectionIDdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "emitCommonSection SectionID: " <<
 SectionID << " new addr: " << format("%p", Addr)
 << " DataSize: " << CommonSize << "\n"; } }
 while (false)
                  << " new addr: " << format("%p", Addr)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "emitCommonSection SectionID: " <<
 SectionID << " new addr: " << format("%p", Addr)
 << " DataSize: " << CommonSize << "\n"; } }
 while (false)
                  << " DataSize: " << CommonSize << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "emitCommonSection SectionID: " <<
 SectionID << " new addr: " << format("%p", Addr)
 << " DataSize: " << CommonSize << "\n"; } }
 while (false);

// Assign the address of each symbol
for (auto &Sym : SymbolsToAllocate) {
  uint32_t Align = Sym.getAlignment();
  uint64_t Size = Sym.getCommonSize();
  StringRef Name;
  if (auto NameOrErr = Sym.getName())
    Name = *NameOrErr;
  else
    return NameOrErr.takeError();
  if (Align) {
    // This symbol has an alignment requirement.
    uint64_t AlignOffset = OffsetToAlignment((uint64_t)Addr, Align);
    Addr += AlignOffset;
    Offset += AlignOffset;
  }
  JITSymbolFlags JITSymFlags = getJITSymbolFlags(Sym);
  LLVM_DEBUG(dbgs() << "Allocating common symbol " << Name << " address "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Allocating common symbol " <<
 Name << " address " << format("%p", Addr) <<
 "\n"; } } while (false)
                    << format("%p", Addr) << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Allocating common symbol " <<
 Name << " address " << format("%p", Addr) <<
 "\n"; } } while (false);
  GlobalSymbolTable[Name] =
    SymbolTableEntry(SectionID, Offset, JITSymFlags);
  Offset += Size;
  Addr += Size;
}

if (Checker)
  Checker->registerSection(Obj.getFileName(), SectionID);

return Error::success();
699}

701Expected<unsigned>
702RuntimeDyldImpl::emitSection(const ObjectFile &Obj,
                           const SectionRef &Section,
                           bool IsCode) {
StringRef data;
uint64_t Alignment64 = Section.getAlignment();

unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
unsigned PaddingSize = 0;
unsigned StubBufSize = 0;
bool IsRequired = isRequiredForExecution(Section);
bool IsVirtual = Section.isVirtual();
bool IsZeroInit = isZeroInit(Section);
bool IsReadOnly = isReadOnlyData(Section);
uint64_t DataSize = Section.getSize();

StringRef Name;
if (auto EC = Section.getName(Name))
  return errorCodeToError(EC);

StubBufSize = computeSectionStubBufSize(Obj, Section);

// The .eh_frame section (at least on Linux) needs an extra four bytes padded
// with zeroes added at the end.  For MachO objects, this section has a
// slightly different name, so this won't have any effect for MachO objects.
if (Name == ".eh_frame")
  PaddingSize = 4;

uintptr_t Allocate;
unsigned SectionID = Sections.size();
uint8_t *Addr;
const char *pData = nullptr;

// If this section contains any bits (i.e. isn't a virtual or bss section),
// grab a reference to them.
if (!IsVirtual && !IsZeroInit) {
  // In either case, set the location of the unrelocated section in memory,
  // since we still process relocations for it even if we're not applying them.
  if (auto EC = Section.getContents(data))
    return errorCodeToError(EC);
  pData = data.data();
}

// Code section alignment needs to be at least as high as stub alignment or
// padding calculations may by incorrect when the section is remapped to a
// higher alignment.
if (IsCode) {
  Alignment = std::max(Alignment, getStubAlignment());
  if (StubBufSize > 0)
    PaddingSize += getStubAlignment() - 1;
}

// Some sections, such as debug info, don't need to be loaded for execution.
// Process those only if explicitly requested.
if (IsRequired || ProcessAllSections) {
  Allocate = DataSize + PaddingSize + StubBufSize;
  if (!Allocate)
    Allocate = 1;
  Addr = IsCode ? MemMgr.allocateCodeSection(Allocate, Alignment, SectionID,
                                             Name)
                : MemMgr.allocateDataSection(Allocate, Alignment, SectionID,
                                             Name, IsReadOnly);
  if (!Addr)
    report_fatal_error("Unable to allocate section memory!");

  // Zero-initialize or copy the data from the image
  if (IsZeroInit || IsVirtual)
    memset(Addr, 0, DataSize);
  else
    memcpy(Addr, pData, DataSize);

  // Fill in any extra bytes we allocated for padding
  if (PaddingSize != 0) {
    memset(Addr + DataSize, 0, PaddingSize);
    // Update the DataSize variable to include padding.
    DataSize += PaddingSize;

    // Align DataSize to stub alignment if we have any stubs (PaddingSize will
    // have been increased above to account for this).
    if (StubBufSize > 0)
      DataSize &= ~(getStubAlignment() - 1);
  }

  LLVM_DEBUG(dbgs() << "emitSection SectionID: " << SectionID << " Name: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "emitSection SectionID: " <<
 SectionID << " Name: " << Name << " obj addr: "
 << format("%p", pData) << " new addr: " <<
 format("%p", Addr) << " DataSize: " << DataSize <<
 " StubBufSize: " << StubBufSize << " Allocate: "
 << Allocate << "\n"; } } while (false)
                    << Name << " obj addr: " << format("%p", pData)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "emitSection SectionID: " <<
 SectionID << " Name: " << Name << " obj addr: "
 << format("%p", pData) << " new addr: " <<
 format("%p", Addr) << " DataSize: " << DataSize <<
 " StubBufSize: " << StubBufSize << " Allocate: "
 << Allocate << "\n"; } } while (false)
                    << " new addr: " << format("%p", Addr) << " DataSize: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "emitSection SectionID: " <<
 SectionID << " Name: " << Name << " obj addr: "
 << format("%p", pData) << " new addr: " <<
 format("%p", Addr) << " DataSize: " << DataSize <<
 " StubBufSize: " << StubBufSize << " Allocate: "
 << Allocate << "\n"; } } while (false)
                    << DataSize << " StubBufSize: " << StubBufSizedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "emitSection SectionID: " <<
 SectionID << " Name: " << Name << " obj addr: "
 << format("%p", pData) << " new addr: " <<
 format("%p", Addr) << " DataSize: " << DataSize <<
 " StubBufSize: " << StubBufSize << " Allocate: "
 << Allocate << "\n"; } } while (false)
                    << " Allocate: " << Allocate << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "emitSection SectionID: " <<
 SectionID << " Name: " << Name << " obj addr: "
 << format("%p", pData) << " new addr: " <<
 format("%p", Addr) << " DataSize: " << DataSize <<
 " StubBufSize: " << StubBufSize << " Allocate: "
 << Allocate << "\n"; } } while (false);
} else {
  // Even if we didn't load the section, we need to record an entry for it
  // to handle later processing (and by 'handle' I mean don't do anything
  // with these sections).
  Allocate = 0;
  Addr = nullptr;
  LLVM_DEBUG(do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "emitSection SectionID: " <<
 SectionID << " Name: " << Name << " obj addr: "
 << format("%p", data.data()) << " new addr: 0" <<
 " DataSize: " << DataSize << " StubBufSize: " <<
 StubBufSize << " Allocate: " << Allocate <<
 "\n"; } } while (false)
      dbgs() << "emitSection SectionID: " << SectionID << " Name: " << Namedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "emitSection SectionID: " <<
 SectionID << " Name: " << Name << " obj addr: "
 << format("%p", data.data()) << " new addr: 0" <<
 " DataSize: " << DataSize << " StubBufSize: " <<
 StubBufSize << " Allocate: " << Allocate <<
 "\n"; } } while (false)
             << " obj addr: " << format("%p", data.data()) << " new addr: 0"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "emitSection SectionID: " <<
 SectionID << " Name: " << Name << " obj addr: "
 << format("%p", data.data()) << " new addr: 0" <<
 " DataSize: " << DataSize << " StubBufSize: " <<
 StubBufSize << " Allocate: " << Allocate <<
 "\n"; } } while (false)
             << " DataSize: " << DataSize << " StubBufSize: " << StubBufSizedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "emitSection SectionID: " <<
 SectionID << " Name: " << Name << " obj addr: "
 << format("%p", data.data()) << " new addr: 0" <<
 " DataSize: " << DataSize << " StubBufSize: " <<
 StubBufSize << " Allocate: " << Allocate <<
 "\n"; } } while (false)
             << " Allocate: " << Allocate << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "emitSection SectionID: " <<
 SectionID << " Name: " << Name << " obj addr: "
 << format("%p", data.data()) << " new addr: 0" <<
 " DataSize: " << DataSize << " StubBufSize: " <<
 StubBufSize << " Allocate: " << Allocate <<
 "\n"; } } while (false);
}

Sections.push_back(
    SectionEntry(Name, Addr, DataSize, Allocate, (uintptr_t)pData));

// Debug info sections are linked as if their load address was zero
if (!IsRequired)
  Sections.back().setLoadAddress(0);

if (Checker)
  Checker->registerSection(Obj.getFileName(), SectionID);

return SectionID;
813}

815Expected<unsigned>
816RuntimeDyldImpl::findOrEmitSection(const ObjectFile &Obj,
                                 const SectionRef &Section,
                                 bool IsCode,
                                 ObjSectionToIDMap &LocalSections) {

unsigned SectionID = 0;
ObjSectionToIDMap::iterator i = LocalSections.find(Section);
if (i != LocalSections.end())
  SectionID = i->second;
else {
  if (auto SectionIDOrErr = emitSection(Obj, Section, IsCode))
    SectionID = *SectionIDOrErr;
  else
    return SectionIDOrErr.takeError();
  LocalSections[Section] = SectionID;
}
return SectionID;
833}

835void RuntimeDyldImpl::addRelocationForSection(const RelocationEntry &RE,
                                            unsigned SectionID) {
Relocations[SectionID].push_back(RE);
838}

840void RuntimeDyldImpl::addRelocationForSymbol(const RelocationEntry &RE,
                                           StringRef SymbolName) {
// Relocation by symbol.  If the symbol is found in the global symbol table,
// create an appropriate section relocation.  Otherwise, add it to
// ExternalSymbolRelocations.
RTDyldSymbolTable::const_iterator Loc = GlobalSymbolTable.find(SymbolName);
if (Loc == GlobalSymbolTable.end()) {
  ExternalSymbolRelocations[SymbolName].push_back(RE);
} else {
  // Copy the RE since we want to modify its addend.
  RelocationEntry RECopy = RE;
  const auto &SymInfo = Loc->second;
  RECopy.Addend += SymInfo.getOffset();
  Relocations[SymInfo.getSectionID()].push_back(RECopy);
}
855}

857uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr,
                                           unsigned AbiVariant) {
if (Arch == Triple::aarch64 || Arch == Triple::aarch64_be) {
  // This stub has to be able to access the full address space,
  // since symbol lookup won't necessarily find a handy, in-range,
  // PLT stub for functions which could be anywhere.
  // Stub can use ip0 (== x16) to calculate address
  writeBytesUnaligned(0xd2e00010, Addr,    4); // movz ip0, #:abs_g3:<addr>
  writeBytesUnaligned(0xf2c00010, Addr+4,  4); // movk ip0, #:abs_g2_nc:<addr>
  writeBytesUnaligned(0xf2a00010, Addr+8,  4); // movk ip0, #:abs_g1_nc:<addr>
  writeBytesUnaligned(0xf2800010, Addr+12, 4); // movk ip0, #:abs_g0_nc:<addr>
  writeBytesUnaligned(0xd61f0200, Addr+16, 4); // br ip0

  return Addr;
} else if (Arch == Triple::arm || Arch == Triple::armeb) {
  // TODO: There is only ARM far stub now. We should add the Thumb stub,
  // and stubs for branches Thumb - ARM and ARM - Thumb.
  writeBytesUnaligned(0xe51ff004, Addr, 4); // ldr pc, [pc, #-4]
  return Addr + 4;
} else if (IsMipsO32ABI || IsMipsN32ABI) {
  // 0:   3c190000        lui     t9,%hi(addr).
  // 4:   27390000        addiu   t9,t9,%lo(addr).
  // 8:   03200008        jr      t9.
  // c:   00000000        nop.
  const unsigned LuiT9Instr = 0x3c190000, AdduiT9Instr = 0x27390000;
  const unsigned NopInstr = 0x0;
  unsigned JrT9Instr = 0x03200008;
  if ((AbiVariant & ELF::EF_MIPS_ARCH) == ELF::EF_MIPS_ARCH_32R6 ||
      (AbiVariant & ELF::EF_MIPS_ARCH) == ELF::EF_MIPS_ARCH_64R6)
    JrT9Instr = 0x03200009;

  writeBytesUnaligned(LuiT9Instr, Addr, 4);
  writeBytesUnaligned(AdduiT9Instr, Addr + 4, 4);
  writeBytesUnaligned(JrT9Instr, Addr + 8, 4);
  writeBytesUnaligned(NopInstr, Addr + 12, 4);
  return Addr;
} else if (IsMipsN64ABI) {
  // 0:   3c190000        lui     t9,%highest(addr).
  // 4:   67390000        daddiu  t9,t9,%higher(addr).
  // 8:   0019CC38        dsll    t9,t9,16.
  // c:   67390000        daddiu  t9,t9,%hi(addr).
  // 10:  0019CC38        dsll    t9,t9,16.
  // 14:  67390000        daddiu  t9,t9,%lo(addr).
  // 18:  03200008        jr      t9.
  // 1c:  00000000        nop.
  const unsigned LuiT9Instr = 0x3c190000, DaddiuT9Instr = 0x67390000,
                 DsllT9Instr = 0x19CC38;
  const unsigned NopInstr = 0x0;
  unsigned JrT9Instr = 0x03200008;
  if ((AbiVariant & ELF::EF_MIPS_ARCH) == ELF::EF_MIPS_ARCH_64R6)
    JrT9Instr = 0x03200009;

  writeBytesUnaligned(LuiT9Instr, Addr, 4);
  writeBytesUnaligned(DaddiuT9Instr, Addr + 4, 4);
  writeBytesUnaligned(DsllT9Instr, Addr + 8, 4);
  writeBytesUnaligned(DaddiuT9Instr, Addr + 12, 4);
  writeBytesUnaligned(DsllT9Instr, Addr + 16, 4);
  writeBytesUnaligned(DaddiuT9Instr, Addr + 20, 4);
  writeBytesUnaligned(JrT9Instr, Addr + 24, 4);
  writeBytesUnaligned(NopInstr, Addr + 28, 4);
  return Addr;
} else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) {
  // Depending on which version of the ELF ABI is in use, we need to
  // generate one of two variants of the stub.  They both start with
  // the same sequence to load the target address into r12.
  writeInt32BE(Addr,    0x3D800000); // lis   r12, highest(addr)
  writeInt32BE(Addr+4,  0x618C0000); // ori   r12, higher(addr)
  writeInt32BE(Addr+8,  0x798C07C6); // sldi  r12, r12, 32
  writeInt32BE(Addr+12, 0x658C0000); // oris  r12, r12, h(addr)
  writeInt32BE(Addr+16, 0x618C0000); // ori   r12, r12, l(addr)
  if (AbiVariant == 2) {
    // PowerPC64 stub ELFv2 ABI: The address points to the function itself.
    // The address is already in r12 as required by the ABI.  Branch to it.
    writeInt32BE(Addr+20, 0xF8410018); // std   r2,  24(r1)
    writeInt32BE(Addr+24, 0x7D8903A6); // mtctr r12
    writeInt32BE(Addr+28, 0x4E800420); // bctr
  } else {
    // PowerPC64 stub ELFv1 ABI: The address points to a function descriptor.
    // Load the function address on r11 and sets it to control register. Also
    // loads the function TOC in r2 and environment pointer to r11.
    writeInt32BE(Addr+20, 0xF8410028); // std   r2,  40(r1)
    writeInt32BE(Addr+24, 0xE96C0000); // ld    r11, 0(r12)
    writeInt32BE(Addr+28, 0xE84C0008); // ld    r2,  0(r12)
    writeInt32BE(Addr+32, 0x7D6903A6); // mtctr r11
    writeInt32BE(Addr+36, 0xE96C0010); // ld    r11, 16(r2)
    writeInt32BE(Addr+40, 0x4E800420); // bctr
  }
  return Addr;
} else if (Arch == Triple::systemz) {
  writeInt16BE(Addr,    0xC418);     // lgrl %r1,.+8
  writeInt16BE(Addr+2,  0x0000);
  writeInt16BE(Addr+4,  0x0004);
  writeInt16BE(Addr+6,  0x07F1);     // brc 15,%r1
  // 8-byte address stored at Addr + 8
  return Addr;
} else if (Arch == Triple::x86_64) {
  *Addr      = 0xFF; // jmp
  *(Addr+1)  = 0x25; // rip
  // 32-bit PC-relative address of the GOT entry will be stored at Addr+2
} else if (Arch == Triple::x86) {
  *Addr      = 0xE9; // 32-bit pc-relative jump.
}
return Addr;
960}

962// Assign an address to a symbol name and resolve all the relocations
963// associated with it.
964void RuntimeDyldImpl::reassignSectionAddress(unsigned SectionID,
                                           uint64_t Addr) {
// The address to use for relocation resolution is not
// the address of the local section buffer. We must be doing
// a remote execution environment of some sort. Relocations can't
// be applied until all the sections have been moved.  The client must
// trigger this with a call to MCJIT::finalize() or
// RuntimeDyld::resolveRelocations().
//
// Addr is a uint64_t because we can't assume the pointer width
// of the target is the same as that of the host. Just use a generic
// "big enough" type.
LLVM_DEBUG(do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Reassigning address for section "
 << SectionID << " (" << Sections[SectionID
].getName() << "): " << format("0x%016" "l" "x", Sections
[SectionID].getLoadAddress()) << " -> " << format
("0x%016" "l" "x", Addr) << "\n"; } } while (false)
    dbgs() << "Reassigning address for section " << SectionID << " ("do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Reassigning address for section "
 << SectionID << " (" << Sections[SectionID
].getName() << "): " << format("0x%016" "l" "x", Sections
[SectionID].getLoadAddress()) << " -> " << format
("0x%016" "l" "x", Addr) << "\n"; } } while (false)
           << Sections[SectionID].getName() << "): "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Reassigning address for section "
 << SectionID << " (" << Sections[SectionID
].getName() << "): " << format("0x%016" "l" "x", Sections
[SectionID].getLoadAddress()) << " -> " << format
("0x%016" "l" "x", Addr) << "\n"; } } while (false)
           << format("0x%016" PRIx64, Sections[SectionID].getLoadAddress())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Reassigning address for section "
 << SectionID << " (" << Sections[SectionID
].getName() << "): " << format("0x%016" "l" "x", Sections
[SectionID].getLoadAddress()) << " -> " << format
("0x%016" "l" "x", Addr) << "\n"; } } while (false)
           << " -> " << format("0x%016" PRIx64, Addr) << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Reassigning address for section "
 << SectionID << " (" << Sections[SectionID
].getName() << "): " << format("0x%016" "l" "x", Sections
[SectionID].getLoadAddress()) << " -> " << format
("0x%016" "l" "x", Addr) << "\n"; } } while (false);
Sections[SectionID].setLoadAddress(Addr);
982}

984void RuntimeDyldImpl::resolveRelocationList(const RelocationList &Relocs,
                                          uint64_t Value) {
for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
  const RelocationEntry &RE = Relocs[i];
  // Ignore relocations for sections that were not loaded
  if (Sections[RE.SectionID].getAddress() == nullptr)
    continue;
  resolveRelocation(RE, Value);
}
993}

995Error RuntimeDyldImpl::resolveExternalSymbols() {
StringMap<JITEvaluatedSymbol> ExternalSymbolMap;

// Resolution can trigger emission of more symbols, so iterate until
// we've resolved *everything*.
{
  JITSymbolResolver::LookupSet ResolvedSymbols;

  while (true) {
    JITSymbolResolver::LookupSet NewSymbols;

    for (auto &RelocKV : ExternalSymbolRelocations) {
      StringRef Name = RelocKV.first();
      if (!Name.empty() && !GlobalSymbolTable.count(Name) &&
          !ResolvedSymbols.count(Name))
        NewSymbols.insert(Name);
    }

    if (NewSymbols.empty())
      break;

    auto NewResolverResults = Resolver.lookup(NewSymbols);
    if (!NewResolverResults)
      return NewResolverResults.takeError();

    assert(NewResolverResults->size() == NewSymbols.size() &&(static_cast <bool> (NewResolverResults->size() == NewSymbols
.size() && "Should have errored on unresolved symbols"
) ? void (0) : __assert_fail ("NewResolverResults->size() == NewSymbols.size() && \"Should have errored on unresolved symbols\""
, "/build/llvm-toolchain-snapshot-7~svn338205/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp"
, 1021, __extension__ __PRETTY_FUNCTION__))
           "Should have errored on unresolved symbols")(static_cast <bool> (NewResolverResults->size() == NewSymbols
.size() && "Should have errored on unresolved symbols"
) ? void (0) : __assert_fail ("NewResolverResults->size() == NewSymbols.size() && \"Should have errored on unresolved symbols\""
, "/build/llvm-toolchain-snapshot-7~svn338205/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp"
, 1021, __extension__ __PRETTY_FUNCTION__));

    for (auto &RRKV : *NewResolverResults) {
      assert(!ResolvedSymbols.count(RRKV.first) && "Redundant resolution?")(static_cast <bool> (!ResolvedSymbols.count(RRKV.first)
 && "Redundant resolution?") ? void (0) : __assert_fail
 ("!ResolvedSymbols.count(RRKV.first) && \"Redundant resolution?\""
, "/build/llvm-toolchain-snapshot-7~svn338205/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp"
, 1024, __extension__ __PRETTY_FUNCTION__));
      ExternalSymbolMap.insert(RRKV);
      ResolvedSymbols.insert(RRKV.first);
    }
  }
}

while (!ExternalSymbolRelocations.empty()) {

  StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin();

  StringRef Name = i->first();
  if (Name.size() == 0) {
    // This is an absolute symbol, use an address of zero.
    LLVM_DEBUG(dbgs() << "Resolving absolute relocations."do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Resolving absolute relocations."
 << "\n"; } } while (false)
                      << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Resolving absolute relocations."
 << "\n"; } } while (false);
    RelocationList &Relocs = i->second;
    resolveRelocationList(Relocs, 0);
  } else {
    uint64_t Addr = 0;
    JITSymbolFlags Flags;
    RTDyldSymbolTable::const_iterator Loc = GlobalSymbolTable.find(Name);
    if (Loc == GlobalSymbolTable.end()) {
      auto RRI = ExternalSymbolMap.find(Name);
      assert(RRI != ExternalSymbolMap.end() && "No result for symbol")(static_cast <bool> (RRI != ExternalSymbolMap.end() &&
 "No result for symbol") ? void (0) : __assert_fail ("RRI != ExternalSymbolMap.end() && \"No result for symbol\""
, "/build/llvm-toolchain-snapshot-7~svn338205/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp"
, 1048, __extension__ __PRETTY_FUNCTION__));
      Addr = RRI->second.getAddress();
      Flags = RRI->second.getFlags();
      // The call to getSymbolAddress may have caused additional modules to
      // be loaded, which may have added new entries to the
      // ExternalSymbolRelocations map.  Consquently, we need to update our
      // iterator.  This is also why retrieval of the relocation list
      // associated with this symbol is deferred until below this point.
      // New entries may have been added to the relocation list.
      i = ExternalSymbolRelocations.find(Name);
    } else {
      // We found the symbol in our global table.  It was probably in a
      // Module that we loaded previously.
      const auto &SymInfo = Loc->second;
      Addr = getSectionLoadAddress(SymInfo.getSectionID()) +
             SymInfo.getOffset();
      Flags = SymInfo.getFlags();
    }

    // FIXME: Implement error handling that doesn't kill the host program!
    if (!Addr)
      report_fatal_error("Program used external function '" + Name +
                         "' which could not be resolved!");

    // If Resolver returned UINT64_MAX, the client wants to handle this symbol
    // manually and we shouldn't resolve its relocations.
    if (Addr != UINT64_MAX(18446744073709551615UL)) {

      // Tweak the address based on the symbol flags if necessary.
      // For example, this is used by RuntimeDyldMachOARM to toggle the low bit
      // if the target symbol is Thumb.
      Addr = modifyAddressBasedOnFlags(Addr, Flags);

      LLVM_DEBUG(dbgs() << "Resolving relocations Name: " << Name << "\t"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Resolving relocations Name: " <<
 Name << "\t" << format("0x%lx", Addr) << "\n"
; } } while (false)
                        << format("0x%lx", Addr) << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("dyld")) { dbgs() << "Resolving relocations Name: " <<
 Name << "\t" << format("0x%lx", Addr) << "\n"
; } } while (false);
      // This list may have been updated when we called getSymbolAddress, so
      // don't change this code to get the list earlier.
      RelocationList &Relocs = i->second;
      resolveRelocationList(Relocs, Addr);
    }
  }

  ExternalSymbolRelocations.erase(i);
}

return Error::success();
1094}

1096//===----------------------------------------------------------------------===//
1097// RuntimeDyld class implementation

1099uint64_t RuntimeDyld::LoadedObjectInfo::getSectionLoadAddress(
                                        const object::SectionRef &Sec) const {

auto I = ObjSecToIDMap.find(Sec);
if (I != ObjSecToIDMap.end())
  return RTDyld.Sections[I->second].getLoadAddress();

return 0;
1107}

1109void RuntimeDyld::MemoryManager::anchor() {}
1110void JITSymbolResolver::anchor() {}
1111void LegacyJITSymbolResolver::anchor() {}

1113RuntimeDyld::RuntimeDyld(RuntimeDyld::MemoryManager &MemMgr,
                       JITSymbolResolver &Resolver)
  : MemMgr(MemMgr), Resolver(Resolver) {
// FIXME: There's a potential issue lurking here if a single instance of
// RuntimeDyld is used to load multiple objects.  The current implementation
// associates a single memory manager with a RuntimeDyld instance.  Even
// though the public class spawns a new 'impl' instance for each load,
// they share a single memory manager.  This can become a problem when page
// permissions are applied.
Dyld = nullptr;
ProcessAllSections = false;
Checker = nullptr;
1125}

1127RuntimeDyld::~RuntimeDyld() {}

1129static std::unique_ptr<RuntimeDyldCOFF>
1130createRuntimeDyldCOFF(Triple::ArchType Arch, RuntimeDyld::MemoryManager &MM,
                    JITSymbolResolver &Resolver, bool ProcessAllSections,
                    RuntimeDyldCheckerImpl *Checker) {
std::unique_ptr<RuntimeDyldCOFF> Dyld =
  RuntimeDyldCOFF::create(Arch, MM, Resolver);
Dyld->setProcessAllSections(ProcessAllSections);
Dyld->setRuntimeDyldChecker(Checker);
return Dyld;
1138}

1140static std::unique_ptr<RuntimeDyldELF>
1141createRuntimeDyldELF(Triple::ArchType Arch, RuntimeDyld::MemoryManager &MM,
                   JITSymbolResolver &Resolver, bool ProcessAllSections,
                   RuntimeDyldCheckerImpl *Checker) {
std::unique_ptr<RuntimeDyldELF> Dyld =
    RuntimeDyldELF::create(Arch, MM, Resolver);
Dyld->setProcessAllSections(ProcessAllSections);
Dyld->setRuntimeDyldChecker(Checker);
return Dyld;
1149}

1151static std::unique_ptr<RuntimeDyldMachO>
1152createRuntimeDyldMachO(Triple::ArchType Arch, RuntimeDyld::MemoryManager &MM,
                     JITSymbolResolver &Resolver,
                     bool ProcessAllSections,
                     RuntimeDyldCheckerImpl *Checker) {
std::unique_ptr<RuntimeDyldMachO> Dyld =
  RuntimeDyldMachO::create(Arch, MM, Resolver);
Dyld->setProcessAllSections(ProcessAllSections);
Dyld->setRuntimeDyldChecker(Checker);
return Dyld;
1161}

1163std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
1164RuntimeDyld::loadObject(const ObjectFile &Obj) {
if (!Dyld) {
  if (Obj.isELF())
    Dyld =
        createRuntimeDyldELF(static_cast<Triple::ArchType>(Obj.getArch()),
                             MemMgr, Resolver, ProcessAllSections, Checker);
  else if (Obj.isMachO())
    Dyld = createRuntimeDyldMachO(
             static_cast<Triple::ArchType>(Obj.getArch()), MemMgr, Resolver,
             ProcessAllSections, Checker);
  else if (Obj.isCOFF())
    Dyld = createRuntimeDyldCOFF(
             static_cast<Triple::ArchType>(Obj.getArch()), MemMgr, Resolver,
             ProcessAllSections, Checker);
  else
    report_fatal_error("Incompatible object format!");
}

if (!Dyld->isCompatibleFile(Obj))
  report_fatal_error("Incompatible object format!");

auto LoadedObjInfo = Dyld->loadObject(Obj);
MemMgr.notifyObjectLoaded(*this, Obj);
return LoadedObjInfo;
1188}

1190void *RuntimeDyld::getSymbolLocalAddress(StringRef Name) const {
if (!Dyld)
  return nullptr;
return Dyld->getSymbolLocalAddress(Name);
1194}

1196JITEvaluatedSymbol RuntimeDyld::getSymbol(StringRef Name) const {
if (!Dyld)
  return nullptr;
return Dyld->getSymbol(Name);
1200}

1202std::map<StringRef, JITEvaluatedSymbol> RuntimeDyld::getSymbolTable() const {
if (!Dyld)
  return std::map<StringRef, JITEvaluatedSymbol>();
return Dyld->getSymbolTable();
1206}

1208void RuntimeDyld::resolveRelocations() { Dyld->resolveRelocations(); }

1210void RuntimeDyld::reassignSectionAddress(unsigned SectionID, uint64_t Addr) {
Dyld->reassignSectionAddress(SectionID, Addr);
1212}

1214void RuntimeDyld::mapSectionAddress(const void *LocalAddress,
                                  uint64_t TargetAddress) {
Dyld->mapSectionAddress(LocalAddress, TargetAddress);
1217}

1219bool RuntimeDyld::hasError() { return Dyld->hasError(); }

1221StringRef RuntimeDyld::getErrorString() { return Dyld->getErrorString(); }

1223void RuntimeDyld::finalizeWithMemoryManagerLocking() {
bool MemoryFinalizationLocked = MemMgr.FinalizationLocked;
MemMgr.FinalizationLocked = true;
resolveRelocations();
registerEHFrames();
if (!MemoryFinalizationLocked) {
  MemMgr.finalizeMemory();
  MemMgr.FinalizationLocked = false;
}
1232}

1234void RuntimeDyld::registerEHFrames() {
if (Dyld)
  Dyld->registerEHFrames();
1237}

1239void RuntimeDyld::deregisterEHFrames() {
if (Dyld)
  Dyld->deregisterEHFrames();
1242}

1244} // end namespace llvm