1//===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===// 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// This utility provides a simple wrapper around the LLVM Execution Engines, 11// which allow the direct execution of LLVM programs through a Just-In-Time 12// compiler, or through an interpreter if no JIT is available for this platform. 13// 14//===----------------------------------------------------------------------===// 15 16#include "llvm/IR/LLVMContext.h" 17#include "RemoteMemoryManager.h" 18#include "RemoteTarget.h" 19#include "RemoteTargetExternal.h" 20#include "llvm/ADT/Triple.h" 21#include "llvm/Bitcode/ReaderWriter.h" 22#include "llvm/CodeGen/LinkAllCodegenComponents.h" 23#include "llvm/ExecutionEngine/GenericValue.h" 24#include "llvm/ExecutionEngine/Interpreter.h" 25#include "llvm/ExecutionEngine/JIT.h" 26#include "llvm/ExecutionEngine/JITEventListener.h" 27#include "llvm/ExecutionEngine/JITMemoryManager.h" 28#include "llvm/ExecutionEngine/MCJIT.h" 29#include "llvm/ExecutionEngine/ObjectCache.h" 30#include "llvm/ExecutionEngine/SectionMemoryManager.h" 31#include "llvm/IR/IRBuilder.h" 32#include "llvm/IR/Module.h" 33#include "llvm/IR/Type.h" 34#include "llvm/IR/TypeBuilder.h" 35#include "llvm/IRReader/IRReader.h" 36#include "llvm/Object/Archive.h" 37#include "llvm/Object/ObjectFile.h" 38#include "llvm/Support/CommandLine.h" 39#include "llvm/Support/Debug.h" 40#include "llvm/Support/DynamicLibrary.h" 41#include "llvm/Support/Format.h" 42#include "llvm/Support/ManagedStatic.h" 43#include "llvm/Support/MathExtras.h" 44#include "llvm/Support/Memory.h" 45#include "llvm/Support/MemoryBuffer.h" 46#include "llvm/Support/PluginLoader.h" 47#include "llvm/Support/PrettyStackTrace.h" 48#include "llvm/Support/Process.h" 49#include "llvm/Support/Program.h" 50#include "llvm/Support/Signals.h" 51#include "llvm/Support/SourceMgr.h" 52#include "llvm/Support/TargetSelect.h" 53#include "llvm/Support/raw_ostream.h" 54#include "llvm/Transforms/Instrumentation.h" 55#include <cerrno> 56 57#ifdef __CYGWIN__ 58#include <cygwin/version.h> 59#if defined(CYGWIN_VERSION_DLL_MAJOR) && CYGWIN_VERSION_DLL_MAJOR<1007 60#define DO_NOTHING_ATEXIT 1 61#endif 62#endif 63 64using namespace llvm; 65 66#define DEBUG_TYPE "lli" 67 68namespace { 69 cl::opt<std::string> 70 InputFile(cl::desc("<input bitcode>"), cl::Positional, cl::init("-")); 71 72 cl::list<std::string> 73 InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>...")); 74 75 cl::opt<bool> ForceInterpreter("force-interpreter", 76 cl::desc("Force interpretation: disable JIT"), 77 cl::init(false)); 78 79 cl::opt<bool> UseMCJIT( 80 "use-mcjit", cl::desc("Enable use of the MC-based JIT (if available)"), 81 cl::init(false)); 82 83 cl::opt<bool> DebugIR( 84 "debug-ir", cl::desc("Generate debug information to allow debugging IR."), 85 cl::init(false)); 86 87 // The MCJIT supports building for a target address space separate from 88 // the JIT compilation process. Use a forked process and a copying 89 // memory manager with IPC to execute using this functionality. 90 cl::opt<bool> RemoteMCJIT("remote-mcjit", 91 cl::desc("Execute MCJIT'ed code in a separate process."), 92 cl::init(false)); 93 94 // Manually specify the child process for remote execution. This overrides 95 // the simulated remote execution that allocates address space for child 96 // execution. The child process will be executed and will communicate with 97 // lli via stdin/stdout pipes. 98 cl::opt<std::string> 99 ChildExecPath("mcjit-remote-process", 100 cl::desc("Specify the filename of the process to launch " 101 "for remote MCJIT execution. If none is specified," 102 "\n\tremote execution will be simulated in-process."), 103 cl::value_desc("filename"), cl::init("")); 104 105 // Determine optimization level. 106 cl::opt<char> 107 OptLevel("O", 108 cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] " 109 "(default = '-O2')"), 110 cl::Prefix, 111 cl::ZeroOrMore, 112 cl::init(' ')); 113 114 cl::opt<std::string> 115 TargetTriple("mtriple", cl::desc("Override target triple for module")); 116 117 cl::opt<std::string> 118 MArch("march", 119 cl::desc("Architecture to generate assembly for (see --version)")); 120 121 cl::opt<std::string> 122 MCPU("mcpu", 123 cl::desc("Target a specific cpu type (-mcpu=help for details)"), 124 cl::value_desc("cpu-name"), 125 cl::init("")); 126 127 cl::list<std::string> 128 MAttrs("mattr", 129 cl::CommaSeparated, 130 cl::desc("Target specific attributes (-mattr=help for details)"), 131 cl::value_desc("a1,+a2,-a3,...")); 132 133 cl::opt<std::string> 134 EntryFunc("entry-function", 135 cl::desc("Specify the entry function (default = 'main') " 136 "of the executable"), 137 cl::value_desc("function"), 138 cl::init("main")); 139 140 cl::list<std::string> 141 ExtraModules("extra-module", 142 cl::desc("Extra modules to be loaded"), 143 cl::value_desc("input bitcode")); 144 145 cl::list<std::string> 146 ExtraObjects("extra-object", 147 cl::desc("Extra object files to be loaded"), 148 cl::value_desc("input object")); 149 150 cl::list<std::string> 151 ExtraArchives("extra-archive", 152 cl::desc("Extra archive files to be loaded"), 153 cl::value_desc("input archive")); 154 155 cl::opt<bool> 156 EnableCacheManager("enable-cache-manager", 157 cl::desc("Use cache manager to save/load mdoules"), 158 cl::init(false)); 159 160 cl::opt<std::string> 161 ObjectCacheDir("object-cache-dir", 162 cl::desc("Directory to store cached object files " 163 "(must be user writable)"), 164 cl::init("")); 165 166 cl::opt<std::string> 167 FakeArgv0("fake-argv0", 168 cl::desc("Override the 'argv[0]' value passed into the executing" 169 " program"), cl::value_desc("executable")); 170 171 cl::opt<bool> 172 DisableCoreFiles("disable-core-files", cl::Hidden, 173 cl::desc("Disable emission of core files if possible")); 174 175 cl::opt<bool> 176 NoLazyCompilation("disable-lazy-compilation", 177 cl::desc("Disable JIT lazy compilation"), 178 cl::init(false)); 179 180 cl::opt<Reloc::Model> 181 RelocModel("relocation-model", 182 cl::desc("Choose relocation model"), 183 cl::init(Reloc::Default), 184 cl::values( 185 clEnumValN(Reloc::Default, "default", 186 "Target default relocation model"), 187 clEnumValN(Reloc::Static, "static", 188 "Non-relocatable code"), 189 clEnumValN(Reloc::PIC_, "pic", 190 "Fully relocatable, position independent code"), 191 clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic", 192 "Relocatable external references, non-relocatable code"), 193 clEnumValEnd)); 194 195 cl::opt<llvm::CodeModel::Model> 196 CMModel("code-model", 197 cl::desc("Choose code model"), 198 cl::init(CodeModel::JITDefault), 199 cl::values(clEnumValN(CodeModel::JITDefault, "default", 200 "Target default JIT code model"), 201 clEnumValN(CodeModel::Small, "small", 202 "Small code model"), 203 clEnumValN(CodeModel::Kernel, "kernel", 204 "Kernel code model"), 205 clEnumValN(CodeModel::Medium, "medium", 206 "Medium code model"), 207 clEnumValN(CodeModel::Large, "large", 208 "Large code model"), 209 clEnumValEnd)); 210 211 cl::opt<bool> 212 GenerateSoftFloatCalls("soft-float", 213 cl::desc("Generate software floating point library calls"), 214 cl::init(false)); 215 216 cl::opt<llvm::FloatABI::ABIType> 217 FloatABIForCalls("float-abi", 218 cl::desc("Choose float ABI type"), 219 cl::init(FloatABI::Default), 220 cl::values( 221 clEnumValN(FloatABI::Default, "default", 222 "Target default float ABI type"), 223 clEnumValN(FloatABI::Soft, "soft", 224 "Soft float ABI (implied by -soft-float)"), 225 clEnumValN(FloatABI::Hard, "hard", 226 "Hard float ABI (uses FP registers)"), 227 clEnumValEnd)); 228 cl::opt<bool> 229// In debug builds, make this default to true. 230#ifdef NDEBUG 231#define EMIT_DEBUG false 232#else 233#define EMIT_DEBUG true 234#endif 235 EmitJitDebugInfo("jit-emit-debug", 236 cl::desc("Emit debug information to debugger"), 237 cl::init(EMIT_DEBUG)); 238#undef EMIT_DEBUG 239 240 static cl::opt<bool> 241 EmitJitDebugInfoToDisk("jit-emit-debug-to-disk", 242 cl::Hidden, 243 cl::desc("Emit debug info objfiles to disk"), 244 cl::init(false)); 245} 246 247//===----------------------------------------------------------------------===// 248// Object cache 249// 250// This object cache implementation writes cached objects to disk to the 251// directory specified by CacheDir, using a filename provided in the module 252// descriptor. The cache tries to load a saved object using that path if the 253// file exists. CacheDir defaults to "", in which case objects are cached 254// alongside their originating bitcodes. 255// 256class LLIObjectCache : public ObjectCache { 257public: 258 LLIObjectCache(const std::string& CacheDir) : CacheDir(CacheDir) { 259 // Add trailing '/' to cache dir if necessary. 260 if (!this->CacheDir.empty() && 261 this->CacheDir[this->CacheDir.size() - 1] != '/') 262 this->CacheDir += '/'; 263 } 264 virtual ~LLIObjectCache() {} 265 266 void notifyObjectCompiled(const Module *M, const MemoryBuffer *Obj) override { 267 const std::string ModuleID = M->getModuleIdentifier(); 268 std::string CacheName; 269 if (!getCacheFilename(ModuleID, CacheName)) 270 return; 271 std::string errStr; 272 if (!CacheDir.empty()) { // Create user-defined cache dir. 273 SmallString<128> dir(CacheName); 274 sys::path::remove_filename(dir); 275 sys::fs::create_directories(Twine(dir)); 276 } 277 raw_fd_ostream outfile(CacheName.c_str(), errStr, sys::fs::F_None); 278 outfile.write(Obj->getBufferStart(), Obj->getBufferSize()); 279 outfile.close(); 280 } 281 282 MemoryBuffer* getObject(const Module* M) override { 283 const std::string ModuleID = M->getModuleIdentifier(); 284 std::string CacheName; 285 if (!getCacheFilename(ModuleID, CacheName)) 286 return nullptr; 287 // Load the object from the cache filename 288 ErrorOr<std::unique_ptr<MemoryBuffer>> IRObjectBuffer = 289 MemoryBuffer::getFile(CacheName.c_str(), -1, false); 290 // If the file isn't there, that's OK. 291 if (!IRObjectBuffer) 292 return nullptr; 293 // MCJIT will want to write into this buffer, and we don't want that 294 // because the file has probably just been mmapped. Instead we make 295 // a copy. The filed-based buffer will be released when it goes 296 // out of scope. 297 return MemoryBuffer::getMemBufferCopy(IRObjectBuffer.get()->getBuffer()); 298 } 299 300private: 301 std::string CacheDir; 302 303 bool getCacheFilename(const std::string &ModID, std::string &CacheName) { 304 std::string Prefix("file:"); 305 size_t PrefixLength = Prefix.length(); 306 if (ModID.substr(0, PrefixLength) != Prefix) 307 return false; 308 std::string CacheSubdir = ModID.substr(PrefixLength); 309#if defined(_WIN32) 310 // Transform "X:\foo" => "/X\foo" for convenience. 311 if (isalpha(CacheSubdir[0]) && CacheSubdir[1] == ':') { 312 CacheSubdir[1] = CacheSubdir[0]; 313 CacheSubdir[0] = '/'; 314 } 315#endif 316 CacheName = CacheDir + CacheSubdir; 317 size_t pos = CacheName.rfind('.'); 318 CacheName.replace(pos, CacheName.length() - pos, ".o"); 319 return true; 320 } 321}; 322 323static ExecutionEngine *EE = nullptr; 324static LLIObjectCache *CacheManager = nullptr; 325 326static void do_shutdown() { 327 // Cygwin-1.5 invokes DLL's dtors before atexit handler. 328#ifndef DO_NOTHING_ATEXIT 329 delete EE; 330 if (CacheManager) 331 delete CacheManager; 332 llvm_shutdown(); 333#endif 334} 335 336// On Mingw and Cygwin, an external symbol named '__main' is called from the 337// generated 'main' function to allow static intialization. To avoid linking 338// problems with remote targets (because lli's remote target support does not 339// currently handle external linking) we add a secondary module which defines 340// an empty '__main' function. 341static void addCygMingExtraModule(ExecutionEngine *EE, 342 LLVMContext &Context, 343 StringRef TargetTripleStr) { 344 IRBuilder<> Builder(Context); 345 Triple TargetTriple(TargetTripleStr); 346 347 // Create a new module. 348 Module *M = new Module("CygMingHelper", Context); 349 M->setTargetTriple(TargetTripleStr); 350 351 // Create an empty function named "__main". 352 Function *Result; 353 if (TargetTriple.isArch64Bit()) { 354 Result = Function::Create( 355 TypeBuilder<int64_t(void), false>::get(Context), 356 GlobalValue::ExternalLinkage, "__main", M); 357 } else { 358 Result = Function::Create( 359 TypeBuilder<int32_t(void), false>::get(Context), 360 GlobalValue::ExternalLinkage, "__main", M); 361 } 362 BasicBlock *BB = BasicBlock::Create(Context, "__main", Result); 363 Builder.SetInsertPoint(BB); 364 Value *ReturnVal; 365 if (TargetTriple.isArch64Bit()) 366 ReturnVal = ConstantInt::get(Context, APInt(64, 0)); 367 else 368 ReturnVal = ConstantInt::get(Context, APInt(32, 0)); 369 Builder.CreateRet(ReturnVal); 370 371 // Add this new module to the ExecutionEngine. 372 EE->addModule(M); 373} 374 375 376//===----------------------------------------------------------------------===// 377// main Driver function 378// 379int main(int argc, char **argv, char * const *envp) { 380 sys::PrintStackTraceOnErrorSignal(); 381 PrettyStackTraceProgram X(argc, argv); 382 383 LLVMContext &Context = getGlobalContext(); 384 atexit(do_shutdown); // Call llvm_shutdown() on exit. 385 386 // If we have a native target, initialize it to ensure it is linked in and 387 // usable by the JIT. 388 InitializeNativeTarget(); 389 InitializeNativeTargetAsmPrinter(); 390 InitializeNativeTargetAsmParser(); 391 392 cl::ParseCommandLineOptions(argc, argv, 393 "llvm interpreter & dynamic compiler\n"); 394 395 // If the user doesn't want core files, disable them. 396 if (DisableCoreFiles) 397 sys::Process::PreventCoreFiles(); 398 399 // Load the bitcode... 400 SMDiagnostic Err; 401 Module *Mod = ParseIRFile(InputFile, Err, Context); 402 if (!Mod) { 403 Err.print(argv[0], errs()); 404 return 1; 405 } 406 407 if (EnableCacheManager) { 408 if (UseMCJIT) { 409 std::string CacheName("file:"); 410 CacheName.append(InputFile); 411 Mod->setModuleIdentifier(CacheName); 412 } else 413 errs() << "warning: -enable-cache-manager can only be used with MCJIT."; 414 } 415 416 // If not jitting lazily, load the whole bitcode file eagerly too. 417 if (NoLazyCompilation) { 418 if (std::error_code EC = Mod->materializeAllPermanently()) { 419 errs() << argv[0] << ": bitcode didn't read correctly.\n"; 420 errs() << "Reason: " << EC.message() << "\n"; 421 exit(1); 422 } 423 } 424 425 if (DebugIR) { 426 if (!UseMCJIT) { 427 errs() << "warning: -debug-ir used without -use-mcjit. Only partial debug" 428 << " information will be emitted by the non-MC JIT engine. To see full" 429 << " source debug information, enable the flag '-use-mcjit'.\n"; 430 431 } 432 ModulePass *DebugIRPass = createDebugIRPass(); 433 DebugIRPass->runOnModule(*Mod); 434 } 435 436 std::string ErrorMsg; 437 EngineBuilder builder(Mod); 438 builder.setMArch(MArch); 439 builder.setMCPU(MCPU); 440 builder.setMAttrs(MAttrs); 441 builder.setRelocationModel(RelocModel); 442 builder.setCodeModel(CMModel); 443 builder.setErrorStr(&ErrorMsg); 444 builder.setEngineKind(ForceInterpreter 445 ? EngineKind::Interpreter 446 : EngineKind::JIT); 447 448 // If we are supposed to override the target triple, do so now. 449 if (!TargetTriple.empty()) 450 Mod->setTargetTriple(Triple::normalize(TargetTriple)); 451 452 // Enable MCJIT if desired. 453 RTDyldMemoryManager *RTDyldMM = nullptr; 454 if (UseMCJIT && !ForceInterpreter) { 455 builder.setUseMCJIT(true); 456 if (RemoteMCJIT) 457 RTDyldMM = new RemoteMemoryManager(); 458 else 459 RTDyldMM = new SectionMemoryManager(); 460 builder.setMCJITMemoryManager(RTDyldMM); 461 } else { 462 if (RemoteMCJIT) { 463 errs() << "error: Remote process execution requires -use-mcjit\n"; 464 exit(1); 465 } 466 builder.setJITMemoryManager(ForceInterpreter ? nullptr : 467 JITMemoryManager::CreateDefaultMemManager()); 468 } 469 470 CodeGenOpt::Level OLvl = CodeGenOpt::Default; 471 switch (OptLevel) { 472 default: 473 errs() << argv[0] << ": invalid optimization level.\n"; 474 return 1; 475 case ' ': break; 476 case '0': OLvl = CodeGenOpt::None; break; 477 case '1': OLvl = CodeGenOpt::Less; break; 478 case '2': OLvl = CodeGenOpt::Default; break; 479 case '3': OLvl = CodeGenOpt::Aggressive; break; 480 } 481 builder.setOptLevel(OLvl); 482 483 TargetOptions Options; 484 Options.UseSoftFloat = GenerateSoftFloatCalls; 485 if (FloatABIForCalls != FloatABI::Default) 486 Options.FloatABIType = FloatABIForCalls; 487 if (GenerateSoftFloatCalls) 488 FloatABIForCalls = FloatABI::Soft; 489 490 // Remote target execution doesn't handle EH or debug registration. 491 if (!RemoteMCJIT) { 492 Options.JITEmitDebugInfo = EmitJitDebugInfo; 493 Options.JITEmitDebugInfoToDisk = EmitJitDebugInfoToDisk; 494 } 495 496 builder.setTargetOptions(Options); 497 498 EE = builder.create(); 499 if (!EE) { 500 if (!ErrorMsg.empty()) 501 errs() << argv[0] << ": error creating EE: " << ErrorMsg << "\n"; 502 else 503 errs() << argv[0] << ": unknown error creating EE!\n"; 504 exit(1); 505 } 506 507 if (EnableCacheManager) { 508 CacheManager = new LLIObjectCache(ObjectCacheDir); 509 EE->setObjectCache(CacheManager); 510 } 511 512 // Load any additional modules specified on the command line. 513 for (unsigned i = 0, e = ExtraModules.size(); i != e; ++i) { 514 Module *XMod = ParseIRFile(ExtraModules[i], Err, Context); 515 if (!XMod) { 516 Err.print(argv[0], errs()); 517 return 1; 518 } 519 if (EnableCacheManager) { 520 if (UseMCJIT) { 521 std::string CacheName("file:"); 522 CacheName.append(ExtraModules[i]); 523 XMod->setModuleIdentifier(CacheName); 524 } 525 // else, we already printed a warning above. 526 } 527 EE->addModule(XMod); 528 } 529 530 for (unsigned i = 0, e = ExtraObjects.size(); i != e; ++i) { 531 ErrorOr<object::ObjectFile *> Obj = 532 object::ObjectFile::createObjectFile(ExtraObjects[i]); 533 if (!Obj) { 534 Err.print(argv[0], errs()); 535 return 1; 536 } 537 EE->addObjectFile(std::unique_ptr<object::ObjectFile>(Obj.get())); 538 } 539 540 for (unsigned i = 0, e = ExtraArchives.size(); i != e; ++i) { 541 ErrorOr<std::unique_ptr<MemoryBuffer>> ArBuf = 542 MemoryBuffer::getFileOrSTDIN(ExtraArchives[i]); 543 if (!ArBuf) { 544 Err.print(argv[0], errs()); 545 return 1; 546 } 547 std::error_code EC; 548 object::Archive *Ar = new object::Archive(std::move(ArBuf.get()), EC); 549 if (EC || !Ar) { 550 Err.print(argv[0], errs()); 551 return 1; 552 } 553 EE->addArchive(Ar); 554 } 555 556 // If the target is Cygwin/MingW and we are generating remote code, we 557 // need an extra module to help out with linking. 558 if (RemoteMCJIT && Triple(Mod->getTargetTriple()).isOSCygMing()) { 559 addCygMingExtraModule(EE, Context, Mod->getTargetTriple()); 560 } 561 562 // The following functions have no effect if their respective profiling 563 // support wasn't enabled in the build configuration. 564 EE->RegisterJITEventListener( 565 JITEventListener::createOProfileJITEventListener()); 566 EE->RegisterJITEventListener( 567 JITEventListener::createIntelJITEventListener()); 568 569 if (!NoLazyCompilation && RemoteMCJIT) { 570 errs() << "warning: remote mcjit does not support lazy compilation\n"; 571 NoLazyCompilation = true; 572 } 573 EE->DisableLazyCompilation(NoLazyCompilation); 574 575 // If the user specifically requested an argv[0] to pass into the program, 576 // do it now. 577 if (!FakeArgv0.empty()) { 578 InputFile = FakeArgv0; 579 } else { 580 // Otherwise, if there is a .bc suffix on the executable strip it off, it 581 // might confuse the program. 582 if (StringRef(InputFile).endswith(".bc")) 583 InputFile.erase(InputFile.length() - 3); 584 } 585 586 // Add the module's name to the start of the vector of arguments to main(). 587 InputArgv.insert(InputArgv.begin(), InputFile); 588 589 // Call the main function from M as if its signature were: 590 // int main (int argc, char **argv, const char **envp) 591 // using the contents of Args to determine argc & argv, and the contents of 592 // EnvVars to determine envp. 593 // 594 Function *EntryFn = Mod->getFunction(EntryFunc); 595 if (!EntryFn) { 596 errs() << '\'' << EntryFunc << "\' function not found in module.\n"; 597 return -1; 598 } 599 600 // Reset errno to zero on entry to main. 601 errno = 0; 602 603 int Result; 604 605 if (!RemoteMCJIT) { 606 // If the program doesn't explicitly call exit, we will need the Exit 607 // function later on to make an explicit call, so get the function now. 608 Constant *Exit = Mod->getOrInsertFunction("exit", Type::getVoidTy(Context), 609 Type::getInt32Ty(Context), 610 NULL); 611 612 // Run static constructors. 613 if (UseMCJIT && !ForceInterpreter) { 614 // Give MCJIT a chance to apply relocations and set page permissions. 615 EE->finalizeObject(); 616 } 617 EE->runStaticConstructorsDestructors(false); 618 619 if (!UseMCJIT && NoLazyCompilation) { 620 for (Module::iterator I = Mod->begin(), E = Mod->end(); I != E; ++I) { 621 Function *Fn = &*I; 622 if (Fn != EntryFn && !Fn->isDeclaration()) 623 EE->getPointerToFunction(Fn); 624 } 625 } 626 627 // Trigger compilation separately so code regions that need to be 628 // invalidated will be known. 629 (void)EE->getPointerToFunction(EntryFn); 630 // Clear instruction cache before code will be executed. 631 if (RTDyldMM) 632 static_cast<SectionMemoryManager*>(RTDyldMM)->invalidateInstructionCache(); 633 634 // Run main. 635 Result = EE->runFunctionAsMain(EntryFn, InputArgv, envp); 636 637 // Run static destructors. 638 EE->runStaticConstructorsDestructors(true); 639 640 // If the program didn't call exit explicitly, we should call it now. 641 // This ensures that any atexit handlers get called correctly. 642 if (Function *ExitF = dyn_cast<Function>(Exit)) { 643 std::vector<GenericValue> Args; 644 GenericValue ResultGV; 645 ResultGV.IntVal = APInt(32, Result); 646 Args.push_back(ResultGV); 647 EE->runFunction(ExitF, Args); 648 errs() << "ERROR: exit(" << Result << ") returned!\n"; 649 abort(); 650 } else { 651 errs() << "ERROR: exit defined with wrong prototype!\n"; 652 abort(); 653 } 654 } else { 655 // else == "if (RemoteMCJIT)" 656 657 // Remote target MCJIT doesn't (yet) support static constructors. No reason 658 // it couldn't. This is a limitation of the LLI implemantation, not the 659 // MCJIT itself. FIXME. 660 // 661 RemoteMemoryManager *MM = static_cast<RemoteMemoryManager*>(RTDyldMM); 662 // Everything is prepared now, so lay out our program for the target 663 // address space, assign the section addresses to resolve any relocations, 664 // and send it to the target. 665 666 std::unique_ptr<RemoteTarget> Target; 667 if (!ChildExecPath.empty()) { // Remote execution on a child process 668#ifndef LLVM_ON_UNIX 669 // FIXME: Remove this pointless fallback mode which causes tests to "pass" 670 // on platforms where they should XFAIL. 671 errs() << "Warning: host does not support external remote targets.\n" 672 << " Defaulting to simulated remote execution\n"; 673 Target.reset(new RemoteTarget); 674#else 675 if (!sys::fs::can_execute(ChildExecPath)) { 676 errs() << "Unable to find usable child executable: '" << ChildExecPath 677 << "'\n"; 678 return -1; 679 } 680 Target.reset(new RemoteTargetExternal(ChildExecPath)); 681#endif 682 } else { 683 // No child process name provided, use simulated remote execution. 684 Target.reset(new RemoteTarget); 685 } 686 687 // Give the memory manager a pointer to our remote target interface object. 688 MM->setRemoteTarget(Target.get()); 689 690 // Create the remote target. 691 if (!Target->create()) { 692 errs() << "ERROR: " << Target->getErrorMsg() << "\n"; 693 return EXIT_FAILURE; 694 } 695 696 // Since we're executing in a (at least simulated) remote address space, 697 // we can't use the ExecutionEngine::runFunctionAsMain(). We have to 698 // grab the function address directly here and tell the remote target 699 // to execute the function. 700 // 701 // Our memory manager will map generated code into the remote address 702 // space as it is loaded and copy the bits over during the finalizeMemory 703 // operation. 704 // 705 // FIXME: argv and envp handling. 706 uint64_t Entry = EE->getFunctionAddress(EntryFn->getName().str()); 707 708 DEBUG(dbgs() << "Executing '" << EntryFn->getName() << "' at 0x" 709 << format("%llx", Entry) << "\n"); 710 711 if (!Target->executeCode(Entry, Result)) 712 errs() << "ERROR: " << Target->getErrorMsg() << "\n"; 713 714 // Like static constructors, the remote target MCJIT support doesn't handle 715 // this yet. It could. FIXME. 716 717 // Stop the remote target 718 Target->stop(); 719 } 720 721 return Result; 722} 723