lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp

   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 //===----------------------------------------------------------------------===//
  13
  14 #define DEBUG_TYPE "dyld"
  15 #include "llvm/ExecutionEngine/RuntimeDyld.h"
  16 #include "ObjectImageCommon.h"
  17 #include "RuntimeDyldELF.h"
  18 #include "RuntimeDyldImpl.h"
  19 #include "RuntimeDyldMachO.h"
  20 #include "llvm/Support/FileSystem.h"
  21 #include "llvm/Support/MathExtras.h"
  22 #include "llvm/Object/ELF.h"
  23
  24 using namespace llvm;
  25 using namespace llvm::object;
  26
  27 // Empty out-of-line virtual destructor as the key function.
  28 RuntimeDyldImpl::~RuntimeDyldImpl() {}
  29
  30 namespace llvm {
  31
  32 StringRef RuntimeDyldImpl::getEHFrameSection() {
  33   return StringRef();
  34 }
  35
  36 // Resolve the relocations for all symbols we currently know about.
  37 void RuntimeDyldImpl::resolveRelocations() {
  38   // First, resolve relocations associated with external symbols.
  39   resolveExternalSymbols();
  40
  41   // Just iterate over the sections we have and resolve all the relocations
  42   // in them. Gross overkill, but it gets the job done.
  43   for (int i = 0, e = Sections.size(); i != e; ++i) {
  44     uint64_t Addr = Sections[i].LoadAddress;
  45     DEBUG(dbgs() << "Resolving relocations Section #" << i
  46             << "\t" << format("%p", (uint8_t *)Addr)
  47             << "\n");
  48     resolveRelocationList(Relocations[i], Addr);
  49   }
  50 }
  51
  52 void RuntimeDyldImpl::mapSectionAddress(const void *LocalAddress,
  53                                         uint64_t TargetAddress) {
  54   for (unsigned i = 0, e = Sections.size(); i != e; ++i) {
  55     if (Sections[i].Address == LocalAddress) {
  56       reassignSectionAddress(i, TargetAddress);
  57       return;
  58     }
  59   }
  60   llvm_unreachable("Attempting to remap address of unknown section!");
  61 }
  62
  63 // Subclasses can implement this method to create specialized image instances.
  64 // The caller owns the pointer that is returned.
  65 ObjectImage *RuntimeDyldImpl::createObjectImage(ObjectBuffer *InputBuffer) {
  66   return new ObjectImageCommon(InputBuffer);
  67 }
  68
  69 ObjectImage *RuntimeDyldImpl::loadObject(ObjectBuffer *InputBuffer) {
  70   OwningPtr<ObjectImage> obj(createObjectImage(InputBuffer));
  71   if (!obj)
  72     report_fatal_error("Unable to create object image from memory buffer!");
  73
  74   Arch = (Triple::ArchType)obj->getArch();
  75
  76   // Symbols found in this object
  77   StringMap<SymbolLoc> LocalSymbols;
  78   // Used sections from the object file
  79   ObjSectionToIDMap LocalSections;
  80
  81   // Common symbols requiring allocation, with their sizes and alignments
  82   CommonSymbolMap CommonSymbols;
  83   // Maximum required total memory to allocate all common symbols
  84   uint64_t CommonSize = 0;
  85
  86   error_code err;
  87   // Parse symbols
  88   DEBUG(dbgs() << "Parse symbols:\n");
  89   for (symbol_iterator i = obj->begin_symbols(), e = obj->end_symbols();
  90        i != e; i.increment(err)) {
  91     Check(err);
  92     object::SymbolRef::Type SymType;
  93     StringRef Name;
  94     Check(i->getType(SymType));
  95     Check(i->getName(Name));
  96
  97     uint32_t flags;
  98     Check(i->getFlags(flags));
  99
 100     bool isCommon = flags & SymbolRef::SF_Common;
 101     if (isCommon) {
 102       // Add the common symbols to a list.  We'll allocate them all below.
 103       uint32_t Align;
 104       Check(i->getAlignment(Align));
 105       uint64_t Size = 0;
 106       Check(i->getSize(Size));
 107       CommonSize += Size + Align;
 108       CommonSymbols[*i] = CommonSymbolInfo(Size, Align);
 109     } else {
 110       if (SymType == object::SymbolRef::ST_Function ||
 111           SymType == object::SymbolRef::ST_Data ||
 112           SymType == object::SymbolRef::ST_Unknown) {
 113         uint64_t FileOffset;
 114         StringRef SectionData;
 115         bool IsCode;
 116         section_iterator si = obj->end_sections();
 117         Check(i->getFileOffset(FileOffset));
 118         Check(i->getSection(si));
 119         if (si == obj->end_sections()) continue;
 120         Check(si->getContents(SectionData));
 121         Check(si->isText(IsCode));
 122         const uint8_t* SymPtr = (const uint8_t*)InputBuffer->getBufferStart() +
 123                                 (uintptr_t)FileOffset;
 124         uintptr_t SectOffset = (uintptr_t)(SymPtr -
 125                                            (const uint8_t*)SectionData.begin());
 126         unsigned SectionID = findOrEmitSection(*obj, *si, IsCode, LocalSections);
 127         LocalSymbols[Name.data()] = SymbolLoc(SectionID, SectOffset);
 128         DEBUG(dbgs() << "\tFileOffset: " << format("%p", (uintptr_t)FileOffset)
 129                      << " flags: " << flags
 130                      << " SID: " << SectionID
 131                      << " Offset: " << format("%p", SectOffset));
 132         GlobalSymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
 133       }
 134     }
 135     DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name << "\n");
 136   }
 137
 138   // Allocate common symbols
 139   if (CommonSize != 0)
 140     emitCommonSymbols(*obj, CommonSymbols, CommonSize, LocalSymbols);
 141
 142   // Parse and process relocations
 143   DEBUG(dbgs() << "Parse relocations:\n");
 144   for (section_iterator si = obj->begin_sections(),
 145        se = obj->end_sections(); si != se; si.increment(err)) {
 146     Check(err);
 147     bool isFirstRelocation = true;
 148     unsigned SectionID = 0;
 149     StubMap Stubs;
 150     section_iterator RelocatedSection = si->getRelocatedSection();
 151
 152     for (relocation_iterator i = si->begin_relocations(),
 153          e = si->end_relocations(); i != e; i.increment(err)) {
 154       Check(err);
 155
 156       // If it's the first relocation in this section, find its SectionID
 157       if (isFirstRelocation) {
 158         SectionID =
 159             findOrEmitSection(*obj, *RelocatedSection, true, LocalSections);
 160         DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
 161         isFirstRelocation = false;
 162       }
 163
 164       processRelocationRef(SectionID, *i, *obj, LocalSections, LocalSymbols,
 165                            Stubs);
 166     }
 167   }
 168
 169   return obj.take();
 170 }
 171
 172 void RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
 173                                         const CommonSymbolMap &CommonSymbols,
 174                                         uint64_t TotalSize,
 175                                         SymbolTableMap &SymbolTable) {
 176   // Allocate memory for the section
 177   unsigned SectionID = Sections.size();
 178   uint8_t *Addr = MemMgr->allocateDataSection(TotalSize, sizeof(void*),
 179                                               SectionID, false);
 180   if (!Addr)
 181     report_fatal_error("Unable to allocate memory for common symbols!");
 182   uint64_t Offset = 0;
 183   Sections.push_back(SectionEntry(StringRef(), Addr, TotalSize, 0));
 184   memset(Addr, 0, TotalSize);
 185
 186   DEBUG(dbgs() << "emitCommonSection SectionID: " << SectionID
 187                << " new addr: " << format("%p", Addr)
 188                << " DataSize: " << TotalSize
 189                << "\n");
 190
 191   // Assign the address of each symbol
 192   for (CommonSymbolMap::const_iterator it = CommonSymbols.begin(),
 193        itEnd = CommonSymbols.end(); it != itEnd; it++) {
 194     uint64_t Size = it->second.first;
 195     uint64_t Align = it->second.second;
 196     StringRef Name;
 197     it->first.getName(Name);
 198     if (Align) {
 199       // This symbol has an alignment requirement.
 200       uint64_t AlignOffset = OffsetToAlignment((uint64_t)Addr, Align);
 201       Addr += AlignOffset;
 202       Offset += AlignOffset;
 203       DEBUG(dbgs() << "Allocating common symbol " << Name << " address " <<
 204                       format("%p\n", Addr));
 205     }
 206     Obj.updateSymbolAddress(it->first, (uint64_t)Addr);
 207     SymbolTable[Name.data()] = SymbolLoc(SectionID, Offset);
 208     Offset += Size;
 209     Addr += Size;
 210   }
 211 }
 212
 213 unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
 214                                       const SectionRef &Section,
 215                                       bool IsCode) {
 216
 217   unsigned StubBufSize = 0,
 218            StubSize = getMaxStubSize();
 219   error_code err;
 220   const ObjectFile *ObjFile = Obj.getObjectFile();
 221   // FIXME: this is an inefficient way to handle this. We should computed the
 222   // necessary section allocation size in loadObject by walking all the sections
 223   // once.
 224   if (StubSize > 0) {
 225     for (section_iterator SI = ObjFile->begin_sections(),
 226            SE = ObjFile->end_sections();
 227          SI != SE; SI.increment(err), Check(err)) {
 228       section_iterator RelSecI = SI->getRelocatedSection();
 229       if (!(RelSecI == Section))
 230         continue;
 231
 232       for (relocation_iterator I = SI->begin_relocations(),
 233              E = SI->end_relocations(); I != E; I.increment(err), Check(err)) {
 234         StubBufSize += StubSize;
 235       }
 236     }
 237   }
 238
 239   StringRef data;
 240   uint64_t Alignment64;
 241   Check(Section.getContents(data));
 242   Check(Section.getAlignment(Alignment64));
 243
 244   unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
 245   bool IsRequired;
 246   bool IsVirtual;
 247   bool IsZeroInit;
 248   bool IsReadOnly;
 249   uint64_t DataSize;
 250   StringRef Name;
 251   Check(Section.isRequiredForExecution(IsRequired));
 252   Check(Section.isVirtual(IsVirtual));
 253   Check(Section.isZeroInit(IsZeroInit));
 254   Check(Section.isReadOnlyData(IsReadOnly));
 255   Check(Section.getSize(DataSize));
 256   Check(Section.getName(Name));
 257   if (StubSize > 0) {
 258     unsigned StubAlignment = getStubAlignment();
 259     unsigned EndAlignment = (DataSize | Alignment) & -(DataSize | Alignment);
 260     if (StubAlignment > EndAlignment)
 261       StubBufSize += StubAlignment - EndAlignment;
 262   }
 263
 264   unsigned Allocate;
 265   unsigned SectionID = Sections.size();
 266   uint8_t *Addr;
 267   const char *pData = 0;
 268
 269   // Some sections, such as debug info, don't need to be loaded for execution.
 270   // Leave those where they are.
 271   if (IsRequired) {
 272     Allocate = DataSize + StubBufSize;
 273     Addr = IsCode
 274       ? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID)
 275       : MemMgr->allocateDataSection(Allocate, Alignment, SectionID, IsReadOnly);
 276     if (!Addr)
 277       report_fatal_error("Unable to allocate section memory!");
 278
 279     // Virtual sections have no data in the object image, so leave pData = 0
 280     if (!IsVirtual)
 281       pData = data.data();
 282
 283     // Zero-initialize or copy the data from the image
 284     if (IsZeroInit || IsVirtual)
 285       memset(Addr, 0, DataSize);
 286     else
 287       memcpy(Addr, pData, DataSize);
 288
 289     DEBUG(dbgs() << "emitSection SectionID: " << SectionID
 290                  << " Name: " << Name
 291                  << " obj addr: " << format("%p", pData)
 292                  << " new addr: " << format("%p", Addr)
 293                  << " DataSize: " << DataSize
 294                  << " StubBufSize: " << StubBufSize
 295                  << " Allocate: " << Allocate
 296                  << "\n");
 297     Obj.updateSectionAddress(Section, (uint64_t)Addr);
 298   }
 299   else {
 300     // Even if we didn't load the section, we need to record an entry for it
 301     // to handle later processing (and by 'handle' I mean don't do anything
 302     // with these sections).
 303     Allocate = 0;
 304     Addr = 0;
 305     DEBUG(dbgs() << "emitSection SectionID: " << SectionID
 306                  << " Name: " << Name
 307                  << " obj addr: " << format("%p", data.data())
 308                  << " new addr: 0"
 309                  << " DataSize: " << DataSize
 310                  << " StubBufSize: " << StubBufSize
 311                  << " Allocate: " << Allocate
 312                  << "\n");
 313   }
 314
 315   Sections.push_back(SectionEntry(Name, Addr, DataSize, (uintptr_t)pData));
 316   return SectionID;
 317 }
 318
 319 unsigned RuntimeDyldImpl::findOrEmitSection(ObjectImage &Obj,
 320                                             const SectionRef &Section,
 321                                             bool IsCode,
 322                                             ObjSectionToIDMap &LocalSections) {
 323
 324   unsigned SectionID = 0;
 325   ObjSectionToIDMap::iterator i = LocalSections.find(Section);
 326   if (i != LocalSections.end())
 327     SectionID = i->second;
 328   else {
 329     SectionID = emitSection(Obj, Section, IsCode);
 330     LocalSections[Section] = SectionID;
 331   }
 332   return SectionID;
 333 }
 334
 335 void RuntimeDyldImpl::addRelocationForSection(const RelocationEntry &RE,
 336                                               unsigned SectionID) {
 337   Relocations[SectionID].push_back(RE);
 338 }
 339
 340 void RuntimeDyldImpl::addRelocationForSymbol(const RelocationEntry &RE,
 341                                              StringRef SymbolName) {
 342   // Relocation by symbol.  If the symbol is found in the global symbol table,
 343   // create an appropriate section relocation.  Otherwise, add it to
 344   // ExternalSymbolRelocations.
 345   SymbolTableMap::const_iterator Loc =
 346       GlobalSymbolTable.find(SymbolName);
 347   if (Loc == GlobalSymbolTable.end()) {
 348     ExternalSymbolRelocations[SymbolName].push_back(RE);
 349   } else {
 350     // Copy the RE since we want to modify its addend.
 351     RelocationEntry RECopy = RE;
 352     RECopy.Addend += Loc->second.second;
 353     Relocations[Loc->second.first].push_back(RECopy);
 354   }
 355 }
 356
 357 uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
 358   if (Arch == Triple::aarch64) {
 359     // This stub has to be able to access the full address space,
 360     // since symbol lookup won't necessarily find a handy, in-range,
 361     // PLT stub for functions which could be anywhere.
 362     uint32_t *StubAddr = (uint32_t*)Addr;
 363
 364     // Stub can use ip0 (== x16) to calculate address
 365     *StubAddr = 0xd2e00010; // movz ip0, #:abs_g3:<addr>
 366     StubAddr++;
 367     *StubAddr = 0xf2c00010; // movk ip0, #:abs_g2_nc:<addr>
 368     StubAddr++;
 369     *StubAddr = 0xf2a00010; // movk ip0, #:abs_g1_nc:<addr>
 370     StubAddr++;
 371     *StubAddr = 0xf2800010; // movk ip0, #:abs_g0_nc:<addr>
 372     StubAddr++;
 373     *StubAddr = 0xd61f0200; // br ip0
 374
 375     return Addr;
 376   } else if (Arch == Triple::arm) {
 377     // TODO: There is only ARM far stub now. We should add the Thumb stub,
 378     // and stubs for branches Thumb - ARM and ARM - Thumb.
 379     uint32_t *StubAddr = (uint32_t*)Addr;
 380     *StubAddr = 0xe51ff004; // ldr pc,<label>
 381     return (uint8_t*)++StubAddr;
 382   } else if (Arch == Triple::mipsel || Arch == Triple::mips) {
 383     uint32_t *StubAddr = (uint32_t*)Addr;
 384     // 0:   3c190000        lui     t9,%hi(addr).
 385     // 4:   27390000        addiu   t9,t9,%lo(addr).
 386     // 8:   03200008        jr      t9.
 387     // c:   00000000        nop.
 388     const unsigned LuiT9Instr = 0x3c190000, AdduiT9Instr = 0x27390000;
 389     const unsigned JrT9Instr = 0x03200008, NopInstr = 0x0;
 390
 391     *StubAddr = LuiT9Instr;
 392     StubAddr++;
 393     *StubAddr = AdduiT9Instr;
 394     StubAddr++;
 395     *StubAddr = JrT9Instr;
 396     StubAddr++;
 397     *StubAddr = NopInstr;
 398     return Addr;
 399   } else if (Arch == Triple::ppc64) {
 400     // PowerPC64 stub: the address points to a function descriptor
 401     // instead of the function itself. Load the function address
 402     // on r11 and sets it to control register. Also loads the function
 403     // TOC in r2 and environment pointer to r11.
 404     writeInt32BE(Addr,    0x3D800000); // lis   r12, highest(addr)
 405     writeInt32BE(Addr+4,  0x618C0000); // ori   r12, higher(addr)
 406     writeInt32BE(Addr+8,  0x798C07C6); // sldi  r12, r12, 32
 407     writeInt32BE(Addr+12, 0x658C0000); // oris  r12, r12, h(addr)
 408     writeInt32BE(Addr+16, 0x618C0000); // ori   r12, r12, l(addr)
 409     writeInt32BE(Addr+20, 0xF8410028); // std   r2,  40(r1)
 410     writeInt32BE(Addr+24, 0xE96C0000); // ld    r11, 0(r12)
 411     writeInt32BE(Addr+28, 0xE84C0008); // ld    r2,  0(r12)
 412     writeInt32BE(Addr+32, 0x7D6903A6); // mtctr r11
 413     writeInt32BE(Addr+36, 0xE96C0010); // ld    r11, 16(r2)
 414     writeInt32BE(Addr+40, 0x4E800420); // bctr
 415
 416     return Addr;
 417   } else if (Arch == Triple::systemz) {
 418     writeInt16BE(Addr,    0xC418);     // lgrl %r1,.+8
 419     writeInt16BE(Addr+2,  0x0000);
 420     writeInt16BE(Addr+4,  0x0004);
 421     writeInt16BE(Addr+6,  0x07F1);     // brc 15,%r1
 422     // 8-byte address stored at Addr + 8
 423     return Addr;
 424   }
 425   return Addr;
 426 }
 427
 428 // Assign an address to a symbol name and resolve all the relocations
 429 // associated with it.
 430 void RuntimeDyldImpl::reassignSectionAddress(unsigned SectionID,
 431                                              uint64_t Addr) {
 432   // The address to use for relocation resolution is not
 433   // the address of the local section buffer. We must be doing
 434   // a remote execution environment of some sort. Relocations can't
 435   // be applied until all the sections have been moved.  The client must
 436   // trigger this with a call to MCJIT::finalize() or
 437   // RuntimeDyld::resolveRelocations().
 438   //
 439   // Addr is a uint64_t because we can't assume the pointer width
 440   // of the target is the same as that of the host. Just use a generic
 441   // "big enough" type.
 442   Sections[SectionID].LoadAddress = Addr;
 443 }
 444
 445 void RuntimeDyldImpl::resolveRelocationList(const RelocationList &Relocs,
 446                                             uint64_t Value) {
 447   for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
 448     const RelocationEntry &RE = Relocs[i];
 449     // Ignore relocations for sections that were not loaded
 450     if (Sections[RE.SectionID].Address == 0)
 451       continue;
 452     resolveRelocation(RE, Value);
 453   }
 454 }
 455
 456 void RuntimeDyldImpl::resolveExternalSymbols() {
 457   StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin(),
 458                                       e = ExternalSymbolRelocations.end();
 459   for (; i != e; i++) {
 460     StringRef Name = i->first();
 461     RelocationList &Relocs = i->second;
 462     SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
 463     if (Loc == GlobalSymbolTable.end()) {
 464       if (Name.size() == 0) {
 465         // This is an absolute symbol, use an address of zero.
 466         DEBUG(dbgs() << "Resolving absolute relocations." << "\n");
 467         resolveRelocationList(Relocs, 0);
 468       } else {
 469         // This is an external symbol, try to get its address from
 470         // MemoryManager.
 471         uint8_t *Addr = (uint8_t*) MemMgr->getPointerToNamedFunction(Name.data(),
 472                                                                    true);
 473         DEBUG(dbgs() << "Resolving relocations Name: " << Name
 474                 << "\t" << format("%p", Addr)
 475                 << "\n");
 476         resolveRelocationList(Relocs, (uintptr_t)Addr);
 477       }
 478     } else {
 479       report_fatal_error("Expected external symbol");
 480     }
 481   }
 482 }
 483
 484
 485 //===----------------------------------------------------------------------===//
 486 // RuntimeDyld class implementation
 487 RuntimeDyld::RuntimeDyld(RTDyldMemoryManager *mm) {
 488   // FIXME: There's a potential issue lurking here if a single instance of
 489   // RuntimeDyld is used to load multiple objects.  The current implementation
 490   // associates a single memory manager with a RuntimeDyld instance.  Even
 491   // though the public class spawns a new 'impl' instance for each load,
 492   // they share a single memory manager.  This can become a problem when page
 493   // permissions are applied.
 494   Dyld = 0;
 495   MM = mm;
 496 }
 497
 498 RuntimeDyld::~RuntimeDyld() {
 499   delete Dyld;
 500 }
 501
 502 ObjectImage *RuntimeDyld::loadObject(ObjectBuffer *InputBuffer) {
 503   if (!Dyld) {
 504     sys::fs::file_magic Type =
 505         sys::fs::identify_magic(InputBuffer->getBuffer());
 506     switch (Type) {
 507     case sys::fs::file_magic::elf_relocatable:
 508     case sys::fs::file_magic::elf_executable:
 509     case sys::fs::file_magic::elf_shared_object:
 510     case sys::fs::file_magic::elf_core:
 511       Dyld = new RuntimeDyldELF(MM);
 512       break;
 513     case sys::fs::file_magic::macho_object:
 514     case sys::fs::file_magic::macho_executable:
 515     case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
 516     case sys::fs::file_magic::macho_core:
 517     case sys::fs::file_magic::macho_preload_executable:
 518     case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
 519     case sys::fs::file_magic::macho_dynamic_linker:
 520     case sys::fs::file_magic::macho_bundle:
 521     case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
 522     case sys::fs::file_magic::macho_dsym_companion:
 523       Dyld = new RuntimeDyldMachO(MM);
 524       break;
 525     case sys::fs::file_magic::unknown:
 526     case sys::fs::file_magic::bitcode:
 527     case sys::fs::file_magic::archive:
 528     case sys::fs::file_magic::coff_object:
 529     case sys::fs::file_magic::pecoff_executable:
 530       report_fatal_error("Incompatible object format!");
 531     }
 532   } else {
 533     if (!Dyld->isCompatibleFormat(InputBuffer))
 534       report_fatal_error("Incompatible object format!");
 535   }
 536
 537   return Dyld->loadObject(InputBuffer);
 538 }
 539
 540 void *RuntimeDyld::getSymbolAddress(StringRef Name) {
 541   return Dyld->getSymbolAddress(Name);
 542 }
 543
 544 uint64_t RuntimeDyld::getSymbolLoadAddress(StringRef Name) {
 545   return Dyld->getSymbolLoadAddress(Name);
 546 }
 547
 548 void RuntimeDyld::resolveRelocations() {
 549   Dyld->resolveRelocations();
 550 }
 551
 552 void RuntimeDyld::reassignSectionAddress(unsigned SectionID,
 553                                          uint64_t Addr) {
 554   Dyld->reassignSectionAddress(SectionID, Addr);
 555 }
 556
 557 void RuntimeDyld::mapSectionAddress(const void *LocalAddress,
 558                                     uint64_t TargetAddress) {
 559   Dyld->mapSectionAddress(LocalAddress, TargetAddress);
 560 }
 561
 562 StringRef RuntimeDyld::getErrorString() {
 563   return Dyld->getErrorString();
 564 }
 565
 566 StringRef RuntimeDyld::getEHFrameSection() {
 567   return Dyld->getEHFrameSection();
 568 }
 569
 570 } // end namespace llvm