tools/llvm-jitlink/llvm-jitlink.cpp

   1 //===- llvm-jitlink.cpp -- Command line interface/tester for llvm-jitlink -===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This utility provides a simple command line interface to the llvm jitlink
  10 // library, which makes relocatable object files executable in memory. Its
  11 // primary function is as a testing utility for the jitlink library.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm-jitlink.h"
  16
  17 #include "llvm/ExecutionEngine/JITLink/EHFrameSupport.h"
  18 #include "llvm/ExecutionEngine/Orc/ExecutionUtils.h"
  19 #include "llvm/MC/MCAsmInfo.h"
  20 #include "llvm/MC/MCContext.h"
  21 #include "llvm/MC/MCDisassembler/MCDisassembler.h"
  22 #include "llvm/MC/MCInstPrinter.h"
  23 #include "llvm/MC/MCInstrInfo.h"
  24 #include "llvm/MC/MCRegisterInfo.h"
  25 #include "llvm/MC/MCSubtargetInfo.h"
  26 #include "llvm/Object/COFF.h"
  27 #include "llvm/Object/MachO.h"
  28 #include "llvm/Object/ObjectFile.h"
  29 #include "llvm/Support/CommandLine.h"
  30 #include "llvm/Support/Debug.h"
  31 #include "llvm/Support/DynamicLibrary.h"
  32 #include "llvm/Support/InitLLVM.h"
  33 #include "llvm/Support/MemoryBuffer.h"
  34 #include "llvm/Support/TargetRegistry.h"
  35 #include "llvm/Support/TargetSelect.h"
  36 #include "llvm/Support/Timer.h"
  37
  38 #include <list>
  39 #include <string>
  40
  41 #define DEBUG_TYPE "llvm-jitlink"
  42
  43 using namespace llvm;
  44 using namespace llvm::jitlink;
  45 using namespace llvm::orc;
  46
  47 static cl::list<std::string> InputFiles(cl::Positional, cl::OneOrMore,
  48                                         cl::desc("input files"));
  49
  50 static cl::opt<bool> NoExec("noexec", cl::desc("Do not execute loaded code"),
  51                             cl::init(false));
  52
  53 static cl::list<std::string>
  54     CheckFiles("check", cl::desc("File containing verifier checks"),
  55                cl::ZeroOrMore);
  56
  57 static cl::opt<std::string>
  58     EntryPointName("entry", cl::desc("Symbol to call as main entry point"),
  59                    cl::init(""));
  60
  61 static cl::list<std::string> JITLinkDylibs(
  62     "jld", cl::desc("Specifies the JITDylib to be used for any subsequent "
  63                     "input file arguments"));
  64
  65 static cl::list<std::string>
  66     Dylibs("dlopen", cl::desc("Dynamic libraries to load before linking"),
  67            cl::ZeroOrMore);
  68
  69 static cl::list<std::string> InputArgv("args", cl::Positional,
  70                                        cl::desc("<program arguments>..."),
  71                                        cl::ZeroOrMore, cl::PositionalEatsArgs);
  72
  73 static cl::opt<bool>
  74     NoProcessSymbols("no-process-syms",
  75                      cl::desc("Do not resolve to llvm-jitlink process symbols"),
  76                      cl::init(false));
  77
  78 static cl::list<std::string> AbsoluteDefs(
  79     "define-abs",
  80     cl::desc("Inject absolute symbol definitions (syntax: <name>=<addr>)"),
  81     cl::ZeroOrMore);
  82
  83 static cl::opt<bool> ShowAddrs(
  84     "show-addrs",
  85     cl::desc("Print registered symbol, section, got and stub addresses"),
  86     cl::init(false));
  87
  88 static cl::opt<bool> ShowAtomGraph(
  89     "show-graph",
  90     cl::desc("Print the atom graph after fixups have been applied"),
  91     cl::init(false));
  92
  93 static cl::opt<bool> ShowSizes(
  94     "show-sizes",
  95     cl::desc("Show sizes pre- and post-dead stripping, and allocations"),
  96     cl::init(false));
  97
  98 static cl::opt<bool> ShowTimes("show-times",
  99                                cl::desc("Show times for llvm-jitlink phases"),
 100                                cl::init(false));
 101
 102 static cl::opt<bool> ShowRelocatedSectionContents(
 103     "show-relocated-section-contents",
 104     cl::desc("show section contents after fixups have been applied"),
 105     cl::init(false));
 106
 107 ExitOnError ExitOnErr;
 108
 109 namespace llvm {
 110
 111 static raw_ostream &
 112 operator<<(raw_ostream &OS, const Session::MemoryRegionInfo &MRI) {
 113   return OS << "target addr = "
 114             << format("0x%016" PRIx64, MRI.getTargetAddress())
 115             << ", content: " << (const void *)MRI.getContent().data() << " -- "
 116             << (const void *)(MRI.getContent().data() + MRI.getContent().size())
 117             << " (" << MRI.getContent().size() << " bytes)";
 118 }
 119
 120 static raw_ostream &
 121 operator<<(raw_ostream &OS, const Session::SymbolInfoMap &SIM) {
 122   OS << "Symbols:\n";
 123   for (auto &SKV : SIM)
 124     OS << "  \"" << SKV.first() << "\" " << SKV.second << "\n";
 125   return OS;
 126 }
 127
 128 static raw_ostream &
 129 operator<<(raw_ostream &OS, const Session::FileInfo &FI) {
 130   for (auto &SIKV : FI.SectionInfos)
 131     OS << "  Section \"" << SIKV.first() << "\": " << SIKV.second << "\n";
 132   for (auto &GOTKV : FI.GOTEntryInfos)
 133     OS << "  GOT \"" << GOTKV.first() << "\": " << GOTKV.second << "\n";
 134   for (auto &StubKV : FI.StubInfos)
 135     OS << "  Stub \"" << StubKV.first() << "\": " << StubKV.second << "\n";
 136   return OS;
 137 }
 138
 139 static raw_ostream &
 140 operator<<(raw_ostream &OS, const Session::FileInfoMap &FIM) {
 141   for (auto &FIKV : FIM)
 142     OS << "File \"" << FIKV.first() << "\":\n" << FIKV.second;
 143   return OS;
 144 }
 145
 146 static uint64_t computeTotalAtomSizes(AtomGraph &G) {
 147   uint64_t TotalSize = 0;
 148   for (auto *DA : G.defined_atoms())
 149     if (DA->isZeroFill())
 150       TotalSize += DA->getZeroFillSize();
 151     else
 152       TotalSize += DA->getContent().size();
 153   return TotalSize;
 154 }
 155
 156 static void dumpSectionContents(raw_ostream &OS, AtomGraph &G) {
 157   constexpr JITTargetAddress DumpWidth = 16;
 158   static_assert(isPowerOf2_64(DumpWidth), "DumpWidth must be a power of two");
 159
 160   // Put sections in address order.
 161   std::vector<Section *> Sections;
 162   for (auto &S : G.sections())
 163     Sections.push_back(&S);
 164
 165   std::sort(Sections.begin(), Sections.end(),
 166             [](const Section *LHS, const Section *RHS) {
 167               if (LHS->atoms_empty() && RHS->atoms_empty())
 168                 return false;
 169               if (LHS->atoms_empty())
 170                 return false;
 171               if (RHS->atoms_empty())
 172                 return true;
 173               return (*LHS->atoms().begin())->getAddress() <
 174                      (*RHS->atoms().begin())->getAddress();
 175             });
 176
 177   for (auto *S : Sections) {
 178     OS << S->getName() << " content:";
 179     if (S->atoms_empty()) {
 180       OS << "\n  section empty\n";
 181       continue;
 182     }
 183
 184     // Sort atoms into order, then render.
 185     std::vector<DefinedAtom *> Atoms(S->atoms().begin(), S->atoms().end());
 186     std::sort(Atoms.begin(), Atoms.end(),
 187               [](const DefinedAtom *LHS, const DefinedAtom *RHS) {
 188                 return LHS->getAddress() < RHS->getAddress();
 189               });
 190
 191     JITTargetAddress NextAddr = Atoms.front()->getAddress() & ~(DumpWidth - 1);
 192     for (auto *DA : Atoms) {
 193       bool IsZeroFill = DA->isZeroFill();
 194       JITTargetAddress AtomStart = DA->getAddress();
 195       JITTargetAddress AtomSize =
 196           IsZeroFill ? DA->getZeroFillSize() : DA->getContent().size();
 197       JITTargetAddress AtomEnd = AtomStart + AtomSize;
 198       const uint8_t *AtomData =
 199           IsZeroFill ? nullptr : DA->getContent().bytes_begin();
 200
 201       // Pad any space before the atom starts.
 202       while (NextAddr != AtomStart) {
 203         if (NextAddr % DumpWidth == 0)
 204           OS << formatv("\n{0:x16}:", NextAddr);
 205         OS << "   ";
 206         ++NextAddr;
 207       }
 208
 209       // Render the atom content.
 210       while (NextAddr != AtomEnd) {
 211         if (NextAddr % DumpWidth == 0)
 212           OS << formatv("\n{0:x16}:", NextAddr);
 213         if (IsZeroFill)
 214           OS << " 00";
 215         else
 216           OS << formatv(" {0:x-2}", AtomData[NextAddr - AtomStart]);
 217         ++NextAddr;
 218       }
 219     }
 220     OS << "\n";
 221   }
 222 }
 223
 224 Session::Session(Triple TT) : ObjLayer(ES, MemMgr), TT(std::move(TT)) {
 225
 226   /// Local ObjectLinkingLayer::Plugin class to forward modifyPassConfig to the
 227   /// Session.
 228   class JITLinkSessionPlugin : public ObjectLinkingLayer::Plugin {
 229   public:
 230     JITLinkSessionPlugin(Session &S) : S(S) {}
 231     void modifyPassConfig(MaterializationResponsibility &MR, const Triple &TT,
 232                           PassConfiguration &PassConfig) {
 233       S.modifyPassConfig(TT, PassConfig);
 234     }
 235
 236   private:
 237     Session &S;
 238   };
 239
 240   if (!NoExec && !TT.isOSWindows())
 241     ObjLayer.addPlugin(std::make_unique<EHFrameRegistrationPlugin>(
 242         InProcessEHFrameRegistrar::getInstance()));
 243
 244   ObjLayer.addPlugin(std::make_unique<JITLinkSessionPlugin>(*this));
 245 }
 246
 247 void Session::dumpSessionInfo(raw_ostream &OS) {
 248   OS << "Registered addresses:\n" << SymbolInfos << FileInfos;
 249 }
 250
 251 void Session::modifyPassConfig(const Triple &FTT,
 252                                PassConfiguration &PassConfig) {
 253   if (!CheckFiles.empty())
 254     PassConfig.PostFixupPasses.push_back([this](AtomGraph &G) {
 255       if (TT.getObjectFormat() == Triple::MachO)
 256         return registerMachOStubsAndGOT(*this, G);
 257       return make_error<StringError>("Unsupported object format for GOT/stub "
 258                                      "registration",
 259                                      inconvertibleErrorCode());
 260     });
 261
 262   if (ShowAtomGraph)
 263     PassConfig.PostFixupPasses.push_back([](AtomGraph &G) -> Error {
 264       outs() << "Atom graph post-fixup:\n";
 265       G.dump(outs());
 266       return Error::success();
 267     });
 268
 269
 270   if (ShowSizes) {
 271     PassConfig.PrePrunePasses.push_back([this](AtomGraph &G) -> Error {
 272         SizeBeforePruning += computeTotalAtomSizes(G);
 273         return Error::success();
 274       });
 275     PassConfig.PostFixupPasses.push_back([this](AtomGraph &G) -> Error {
 276         SizeAfterFixups += computeTotalAtomSizes(G);
 277         return Error::success();
 278       });
 279   }
 280
 281   if (ShowRelocatedSectionContents)
 282     PassConfig.PostFixupPasses.push_back([](AtomGraph &G) -> Error {
 283       outs() << "Relocated section contents for " << G.getName() << ":\n";
 284       dumpSectionContents(outs(), G);
 285       return Error::success();
 286     });
 287 }
 288
 289 Expected<Session::FileInfo &> Session::findFileInfo(StringRef FileName) {
 290   auto FileInfoItr = FileInfos.find(FileName);
 291   if (FileInfoItr == FileInfos.end())
 292     return make_error<StringError>("file \"" + FileName + "\" not recognized",
 293                                    inconvertibleErrorCode());
 294   return FileInfoItr->second;
 295 }
 296
 297 Expected<Session::MemoryRegionInfo &>
 298 Session::findSectionInfo(StringRef FileName, StringRef SectionName) {
 299   auto FI = findFileInfo(FileName);
 300   if (!FI)
 301     return FI.takeError();
 302   auto SecInfoItr = FI->SectionInfos.find(SectionName);
 303   if (SecInfoItr == FI->SectionInfos.end())
 304     return make_error<StringError>("no section \"" + SectionName +
 305                                        "\" registered for file \"" + FileName +
 306                                        "\"",
 307                                    inconvertibleErrorCode());
 308   return SecInfoItr->second;
 309 }
 310
 311 Expected<Session::MemoryRegionInfo &>
 312 Session::findStubInfo(StringRef FileName, StringRef TargetName) {
 313   auto FI = findFileInfo(FileName);
 314   if (!FI)
 315     return FI.takeError();
 316   auto StubInfoItr = FI->StubInfos.find(TargetName);
 317   if (StubInfoItr == FI->StubInfos.end())
 318     return make_error<StringError>("no stub for \"" + TargetName +
 319                                        "\" registered for file \"" + FileName +
 320                                        "\"",
 321                                    inconvertibleErrorCode());
 322   return StubInfoItr->second;
 323 }
 324
 325 Expected<Session::MemoryRegionInfo &>
 326 Session::findGOTEntryInfo(StringRef FileName, StringRef TargetName) {
 327   auto FI = findFileInfo(FileName);
 328   if (!FI)
 329     return FI.takeError();
 330   auto GOTInfoItr = FI->GOTEntryInfos.find(TargetName);
 331   if (GOTInfoItr == FI->GOTEntryInfos.end())
 332     return make_error<StringError>("no GOT entry for \"" + TargetName +
 333                                        "\" registered for file \"" + FileName +
 334                                        "\"",
 335                                    inconvertibleErrorCode());
 336   return GOTInfoItr->second;
 337 }
 338
 339 bool Session::isSymbolRegistered(StringRef SymbolName) {
 340   return SymbolInfos.count(SymbolName);
 341 }
 342
 343 Expected<Session::MemoryRegionInfo &>
 344 Session::findSymbolInfo(StringRef SymbolName, Twine ErrorMsgStem) {
 345   auto SymInfoItr = SymbolInfos.find(SymbolName);
 346   if (SymInfoItr == SymbolInfos.end())
 347     return make_error<StringError>(ErrorMsgStem + ": symbol " + SymbolName +
 348                                        " not found",
 349                                    inconvertibleErrorCode());
 350   return SymInfoItr->second;
 351 }
 352
 353 } // end namespace llvm
 354
 355 Triple getFirstFileTriple() {
 356   assert(!InputFiles.empty() && "InputFiles can not be empty");
 357   auto ObjBuffer =
 358       ExitOnErr(errorOrToExpected(MemoryBuffer::getFile(InputFiles.front())));
 359   auto Obj = ExitOnErr(
 360       object::ObjectFile::createObjectFile(ObjBuffer->getMemBufferRef()));
 361   return Obj->makeTriple();
 362 }
 363
 364 Error sanitizeArguments(const Session &S) {
 365   if (EntryPointName.empty()) {
 366     if (S.TT.getObjectFormat() == Triple::MachO)
 367       EntryPointName = "_main";
 368     else
 369       EntryPointName = "main";
 370   }
 371
 372   if (NoExec && !InputArgv.empty())
 373     outs() << "Warning: --args passed to -noexec run will be ignored.\n";
 374
 375   return Error::success();
 376 }
 377
 378 Error loadProcessSymbols(Session &S) {
 379   std::string ErrMsg;
 380   if (sys::DynamicLibrary::LoadLibraryPermanently(nullptr, &ErrMsg))
 381     return make_error<StringError>(std::move(ErrMsg), inconvertibleErrorCode());
 382
 383   char GlobalPrefix = S.TT.getObjectFormat() == Triple::MachO ? '_' : '\0';
 384   auto InternedEntryPointName = S.ES.intern(EntryPointName);
 385   auto FilterMainEntryPoint = [InternedEntryPointName](SymbolStringPtr Name) {
 386     return Name != InternedEntryPointName;
 387   };
 388   S.ES.getMainJITDylib().addGenerator(
 389       ExitOnErr(orc::DynamicLibrarySearchGenerator::GetForCurrentProcess(
 390           GlobalPrefix, FilterMainEntryPoint)));
 391
 392   return Error::success();
 393 }
 394
 395 Error loadDylibs() {
 396   // FIXME: This should all be handled inside DynamicLibrary.
 397   for (const auto &Dylib : Dylibs) {
 398     if (!sys::fs::is_regular_file(Dylib))
 399       return make_error<StringError>("\"" + Dylib + "\" is not a regular file",
 400                                      inconvertibleErrorCode());
 401     std::string ErrMsg;
 402     if (sys::DynamicLibrary::LoadLibraryPermanently(Dylib.c_str(), &ErrMsg))
 403       return make_error<StringError>(ErrMsg, inconvertibleErrorCode());
 404   }
 405
 406   return Error::success();
 407 }
 408
 409 Error loadObjects(Session &S) {
 410
 411   std::map<unsigned, JITDylib *> IdxToJLD;
 412
 413   // First, set up JITDylibs.
 414   LLVM_DEBUG(dbgs() << "Creating JITDylibs...\n");
 415   {
 416     // Create a "main" JITLinkDylib.
 417     auto &MainJD = S.ES.getMainJITDylib();
 418     IdxToJLD[0] = &MainJD;
 419     S.JDSearchOrder.push_back(&MainJD);
 420     LLVM_DEBUG(dbgs() << "  0: " << MainJD.getName() << "\n");
 421
 422     // Add any extra JITLinkDylibs from the command line.
 423     std::string JDNamePrefix("lib");
 424     for (auto JLDItr = JITLinkDylibs.begin(), JLDEnd = JITLinkDylibs.end();
 425          JLDItr != JLDEnd; ++JLDItr) {
 426       auto &JD = S.ES.createJITDylib(JDNamePrefix + *JLDItr);
 427       unsigned JDIdx =
 428           JITLinkDylibs.getPosition(JLDItr - JITLinkDylibs.begin());
 429       IdxToJLD[JDIdx] = &JD;
 430       S.JDSearchOrder.push_back(&JD);
 431       LLVM_DEBUG(dbgs() << "  " << JDIdx << ": " << JD.getName() << "\n");
 432     }
 433
 434     // Set every dylib to link against every other, in command line order.
 435     for (auto *JD : S.JDSearchOrder) {
 436       JITDylibSearchList O;
 437       for (auto *JD2 : S.JDSearchOrder) {
 438         if (JD2 == JD)
 439           continue;
 440         O.push_back(std::make_pair(JD2, false));
 441       }
 442       JD->setSearchOrder(std::move(O));
 443     }
 444   }
 445
 446   // Load each object into the corresponding JITDylib..
 447   LLVM_DEBUG(dbgs() << "Adding objects...\n");
 448   for (auto InputFileItr = InputFiles.begin(), InputFileEnd = InputFiles.end();
 449        InputFileItr != InputFileEnd; ++InputFileItr) {
 450     unsigned InputFileArgIdx =
 451         InputFiles.getPosition(InputFileItr - InputFiles.begin());
 452     StringRef InputFile = *InputFileItr;
 453     auto &JD = *std::prev(IdxToJLD.lower_bound(InputFileArgIdx))->second;
 454     LLVM_DEBUG(dbgs() << "  " << InputFileArgIdx << ": \"" << InputFile
 455                       << "\" to " << JD.getName() << "\n";);
 456     auto ObjBuffer =
 457         ExitOnErr(errorOrToExpected(MemoryBuffer::getFile(InputFile)));
 458     ExitOnErr(S.ObjLayer.add(JD, std::move(ObjBuffer)));
 459   }
 460
 461   // Define absolute symbols.
 462   LLVM_DEBUG(dbgs() << "Defining absolute symbols...\n");
 463   for (auto AbsDefItr = AbsoluteDefs.begin(), AbsDefEnd = AbsoluteDefs.end();
 464        AbsDefItr != AbsDefEnd; ++AbsDefItr) {
 465     unsigned AbsDefArgIdx =
 466       AbsoluteDefs.getPosition(AbsDefItr - AbsoluteDefs.begin());
 467     auto &JD = *std::prev(IdxToJLD.lower_bound(AbsDefArgIdx))->second;
 468
 469     StringRef AbsDefStmt = *AbsDefItr;
 470     size_t EqIdx = AbsDefStmt.find_first_of('=');
 471     if (EqIdx == StringRef::npos)
 472       return make_error<StringError>("Invalid absolute define \"" + AbsDefStmt +
 473                                      "\". Syntax: <name>=<addr>",
 474                                      inconvertibleErrorCode());
 475     StringRef Name = AbsDefStmt.substr(0, EqIdx).trim();
 476     StringRef AddrStr = AbsDefStmt.substr(EqIdx + 1).trim();
 477
 478     uint64_t Addr;
 479     if (AddrStr.getAsInteger(0, Addr))
 480       return make_error<StringError>("Invalid address expression \"" + AddrStr +
 481                                      "\" in absolute define \"" + AbsDefStmt +
 482                                      "\"",
 483                                      inconvertibleErrorCode());
 484     JITEvaluatedSymbol AbsDef(Addr, JITSymbolFlags::Exported);
 485     if (auto Err = JD.define(absoluteSymbols({{S.ES.intern(Name), AbsDef}})))
 486       return Err;
 487
 488     // Register the absolute symbol with the session symbol infos.
 489     S.SymbolInfos[Name] = { StringRef(), Addr };
 490   }
 491
 492   LLVM_DEBUG({
 493     dbgs() << "Dylib search order is [ ";
 494     for (auto *JD : S.JDSearchOrder)
 495       dbgs() << JD->getName() << " ";
 496     dbgs() << "]\n";
 497   });
 498
 499   return Error::success();
 500 }
 501
 502 Error runChecks(Session &S) {
 503
 504   auto TripleName = S.TT.str();
 505   std::string ErrorStr;
 506   const Target *TheTarget = TargetRegistry::lookupTarget("", S.TT, ErrorStr);
 507   if (!TheTarget)
 508     ExitOnErr(make_error<StringError>("Error accessing target '" + TripleName +
 509                                           "': " + ErrorStr,
 510                                       inconvertibleErrorCode()));
 511
 512   std::unique_ptr<MCSubtargetInfo> STI(
 513       TheTarget->createMCSubtargetInfo(TripleName, "", ""));
 514   if (!STI)
 515     ExitOnErr(
 516         make_error<StringError>("Unable to create subtarget for " + TripleName,
 517                                 inconvertibleErrorCode()));
 518
 519   std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
 520   if (!MRI)
 521     ExitOnErr(make_error<StringError>("Unable to create target register info "
 522                                       "for " +
 523                                           TripleName,
 524                                       inconvertibleErrorCode()));
 525
 526   std::unique_ptr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*MRI, TripleName));
 527   if (!MAI)
 528     ExitOnErr(make_error<StringError>("Unable to create target asm info " +
 529                                           TripleName,
 530                                       inconvertibleErrorCode()));
 531
 532   MCContext Ctx(MAI.get(), MRI.get(), nullptr);
 533
 534   std::unique_ptr<MCDisassembler> Disassembler(
 535       TheTarget->createMCDisassembler(*STI, Ctx));
 536   if (!Disassembler)
 537     ExitOnErr(make_error<StringError>("Unable to create disassembler for " +
 538                                           TripleName,
 539                                       inconvertibleErrorCode()));
 540
 541   std::unique_ptr<MCInstrInfo> MII(TheTarget->createMCInstrInfo());
 542
 543   std::unique_ptr<MCInstPrinter> InstPrinter(
 544       TheTarget->createMCInstPrinter(Triple(TripleName), 0, *MAI, *MII, *MRI));
 545
 546   auto IsSymbolValid = [&S](StringRef Symbol) {
 547     return S.isSymbolRegistered(Symbol);
 548   };
 549
 550   auto GetSymbolInfo = [&S](StringRef Symbol) {
 551     return S.findSymbolInfo(Symbol, "Can not get symbol info");
 552   };
 553
 554   auto GetSectionInfo = [&S](StringRef FileName, StringRef SectionName) {
 555     return S.findSectionInfo(FileName, SectionName);
 556   };
 557
 558   auto GetStubInfo = [&S](StringRef FileName, StringRef SectionName) {
 559     return S.findStubInfo(FileName, SectionName);
 560   };
 561
 562   auto GetGOTInfo = [&S](StringRef FileName, StringRef SectionName) {
 563     return S.findGOTEntryInfo(FileName, SectionName);
 564   };
 565
 566   RuntimeDyldChecker Checker(
 567       IsSymbolValid, GetSymbolInfo, GetSectionInfo, GetStubInfo, GetGOTInfo,
 568       S.TT.isLittleEndian() ? support::little : support::big,
 569       Disassembler.get(), InstPrinter.get(), dbgs());
 570
 571   for (auto &CheckFile : CheckFiles) {
 572     auto CheckerFileBuf =
 573         ExitOnErr(errorOrToExpected(MemoryBuffer::getFile(CheckFile)));
 574     if (!Checker.checkAllRulesInBuffer("# jitlink-check:", &*CheckerFileBuf))
 575       ExitOnErr(make_error<StringError>(
 576           "Some checks in " + CheckFile + " failed", inconvertibleErrorCode()));
 577   }
 578
 579   return Error::success();
 580 }
 581
 582 static void dumpSessionStats(Session &S) {
 583   if (ShowSizes)
 584     outs() << "Total size of all atoms before pruning: " << S.SizeBeforePruning
 585            << "\nTotal size of all atoms after fixups: " << S.SizeAfterFixups
 586            << "\n";
 587 }
 588
 589 static Expected<JITEvaluatedSymbol> getMainEntryPoint(Session &S) {
 590   return S.ES.lookup(S.JDSearchOrder, EntryPointName);
 591 }
 592
 593 Expected<int> runEntryPoint(Session &S, JITEvaluatedSymbol EntryPoint) {
 594   assert(EntryPoint.getAddress() && "Entry point address should not be null");
 595
 596   constexpr const char *JITProgramName = "<llvm-jitlink jit'd code>";
 597   auto PNStorage = std::make_unique<char[]>(strlen(JITProgramName) + 1);
 598   strcpy(PNStorage.get(), JITProgramName);
 599
 600   std::vector<const char *> EntryPointArgs;
 601   EntryPointArgs.push_back(PNStorage.get());
 602   for (auto &InputArg : InputArgv)
 603     EntryPointArgs.push_back(InputArg.data());
 604   EntryPointArgs.push_back(nullptr);
 605
 606   using MainTy = int (*)(int, const char *[]);
 607   MainTy EntryPointPtr = reinterpret_cast<MainTy>(EntryPoint.getAddress());
 608
 609   return EntryPointPtr(EntryPointArgs.size() - 1, EntryPointArgs.data());
 610 }
 611
 612 int main(int argc, char *argv[]) {
 613   InitLLVM X(argc, argv);
 614
 615   InitializeAllTargetInfos();
 616   InitializeAllTargetMCs();
 617   InitializeAllDisassemblers();
 618
 619   cl::ParseCommandLineOptions(argc, argv, "llvm jitlink tool");
 620   ExitOnErr.setBanner(std::string(argv[0]) + ": ");
 621
 622   Session S(getFirstFileTriple());
 623
 624   ExitOnErr(sanitizeArguments(S));
 625
 626   if (!NoProcessSymbols)
 627     ExitOnErr(loadProcessSymbols(S));
 628   ExitOnErr(loadDylibs());
 629
 630   TimerGroup JITLinkTimers("llvm-jitlink timers",
 631                            "timers for llvm-jitlink phases");
 632
 633   {
 634     Timer LoadObjectsTimer(
 635         "load", "time to load/add object files to llvm-jitlink", JITLinkTimers);
 636     LoadObjectsTimer.startTimer();
 637     ExitOnErr(loadObjects(S));
 638     LoadObjectsTimer.stopTimer();
 639   }
 640
 641   JITEvaluatedSymbol EntryPoint = 0;
 642   {
 643     Timer LinkTimer("link", "time to link object files", JITLinkTimers);
 644     LinkTimer.startTimer();
 645     EntryPoint = ExitOnErr(getMainEntryPoint(S));
 646     LinkTimer.stopTimer();
 647   }
 648
 649   if (ShowAddrs)
 650     S.dumpSessionInfo(outs());
 651
 652   ExitOnErr(runChecks(S));
 653
 654   dumpSessionStats(S);
 655
 656   if (NoExec)
 657     return 0;
 658
 659   int Result = 0;
 660   {
 661     Timer RunTimer("run", "time to execute jitlink'd code", JITLinkTimers);
 662     RunTimer.startTimer();
 663     Result = ExitOnErr(runEntryPoint(S, EntryPoint));
 664     RunTimer.stopTimer();
 665   }
 666
 667   if (ShowTimes)
 668     JITLinkTimers.print(dbgs());
 669
 670   return Result;
 671 }