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 #define DEBUG_TYPE "lli" 17 #include "RecordingMemoryManager.h" 18 #include "RemoteTarget.h" 19 #include "llvm/LLVMContext.h" 20 #include "llvm/Module.h" 21 #include "llvm/Type.h" 22 #include "llvm/ADT/Triple.h" 23 #include "llvm/Bitcode/ReaderWriter.h" 24 #include "llvm/CodeGen/LinkAllCodegenComponents.h" 25 #include "llvm/ExecutionEngine/GenericValue.h" 26 #include "llvm/ExecutionEngine/Interpreter.h" 27 #include "llvm/ExecutionEngine/JIT.h" 28 #include "llvm/ExecutionEngine/JITEventListener.h" 29 #include "llvm/ExecutionEngine/JITMemoryManager.h" 30 #include "llvm/ExecutionEngine/MCJIT.h" 31 #include "llvm/Support/CommandLine.h" 32 #include "llvm/Support/IRReader.h" 33 #include "llvm/Support/ManagedStatic.h" 34 #include "llvm/Support/MemoryBuffer.h" 35 #include "llvm/Support/PluginLoader.h" 36 #include "llvm/Support/PrettyStackTrace.h" 37 #include "llvm/Support/raw_ostream.h" 38 #include "llvm/Support/Format.h" 39 #include "llvm/Support/Process.h" 40 #include "llvm/Support/Signals.h" 41 #include "llvm/Support/TargetSelect.h" 42 #include "llvm/Support/Debug.h" 43 #include "llvm/Support/DynamicLibrary.h" 44 #include "llvm/Support/Memory.h" 45 #include <cerrno> 46 47 #ifdef __linux__ 48 // These includes used by LLIMCJITMemoryManager::getPointerToNamedFunction() 49 // for Glibc trickery. Look comments in this function for more information. 50 #ifdef HAVE_SYS_STAT_H 51 #include <sys/stat.h> 52 #endif 53 #include <fcntl.h> 54 #include <unistd.h> 55 #endif 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 64 using namespace llvm; 65 66 namespace { 67 cl::opt<std::string> 68 InputFile(cl::desc("<input bitcode>"), cl::Positional, cl::init("-")); 69 70 cl::list<std::string> 71 InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>...")); 72 73 cl::opt<bool> ForceInterpreter("force-interpreter", 74 cl::desc("Force interpretation: disable JIT"), 75 cl::init(false)); 76 77 cl::opt<bool> UseMCJIT( 78 "use-mcjit", cl::desc("Enable use of the MC-based JIT (if available)"), 79 cl::init(false)); 80 81 // The MCJIT supports building for a target address space separate from 82 // the JIT compilation process. Use a forked process and a copying 83 // memory manager with IPC to execute using this functionality. 84 cl::opt<bool> RemoteMCJIT("remote-mcjit", 85 cl::desc("Execute MCJIT'ed code in a separate process."), 86 cl::init(false)); 87 88 // Determine optimization level. 89 cl::opt<char> 90 OptLevel("O", 91 cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] " 92 "(default = '-O2')"), 93 cl::Prefix, 94 cl::ZeroOrMore, 95 cl::init(' ')); 96 97 cl::opt<std::string> 98 TargetTriple("mtriple", cl::desc("Override target triple for module")); 99 100 cl::opt<std::string> 101 MArch("march", 102 cl::desc("Architecture to generate assembly for (see --version)")); 103 104 cl::opt<std::string> 105 MCPU("mcpu", 106 cl::desc("Target a specific cpu type (-mcpu=help for details)"), 107 cl::value_desc("cpu-name"), 108 cl::init("")); 109 110 cl::list<std::string> 111 MAttrs("mattr", 112 cl::CommaSeparated, 113 cl::desc("Target specific attributes (-mattr=help for details)"), 114 cl::value_desc("a1,+a2,-a3,...")); 115 116 cl::opt<std::string> 117 EntryFunc("entry-function", 118 cl::desc("Specify the entry function (default = 'main') " 119 "of the executable"), 120 cl::value_desc("function"), 121 cl::init("main")); 122 123 cl::opt<std::string> 124 FakeArgv0("fake-argv0", 125 cl::desc("Override the 'argv[0]' value passed into the executing" 126 " program"), cl::value_desc("executable")); 127 128 cl::opt<bool> 129 DisableCoreFiles("disable-core-files", cl::Hidden, 130 cl::desc("Disable emission of core files if possible")); 131 132 cl::opt<bool> 133 NoLazyCompilation("disable-lazy-compilation", 134 cl::desc("Disable JIT lazy compilation"), 135 cl::init(false)); 136 137 cl::opt<Reloc::Model> 138 RelocModel("relocation-model", 139 cl::desc("Choose relocation model"), 140 cl::init(Reloc::Default), 141 cl::values( 142 clEnumValN(Reloc::Default, "default", 143 "Target default relocation model"), 144 clEnumValN(Reloc::Static, "static", 145 "Non-relocatable code"), 146 clEnumValN(Reloc::PIC_, "pic", 147 "Fully relocatable, position independent code"), 148 clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic", 149 "Relocatable external references, non-relocatable code"), 150 clEnumValEnd)); 151 152 cl::opt<llvm::CodeModel::Model> 153 CMModel("code-model", 154 cl::desc("Choose code model"), 155 cl::init(CodeModel::JITDefault), 156 cl::values(clEnumValN(CodeModel::JITDefault, "default", 157 "Target default JIT code model"), 158 clEnumValN(CodeModel::Small, "small", 159 "Small code model"), 160 clEnumValN(CodeModel::Kernel, "kernel", 161 "Kernel code model"), 162 clEnumValN(CodeModel::Medium, "medium", 163 "Medium code model"), 164 clEnumValN(CodeModel::Large, "large", 165 "Large code model"), 166 clEnumValEnd)); 167 168 cl::opt<bool> 169 EnableJITExceptionHandling("jit-enable-eh", 170 cl::desc("Emit exception handling information"), 171 cl::init(false)); 172 173 cl::opt<bool> 174 // In debug builds, make this default to true. 175 #ifdef NDEBUG 176 #define EMIT_DEBUG false 177 #else 178 #define EMIT_DEBUG true 179 #endif 180 EmitJitDebugInfo("jit-emit-debug", 181 cl::desc("Emit debug information to debugger"), 182 cl::init(EMIT_DEBUG)); 183 #undef EMIT_DEBUG 184 185 static cl::opt<bool> 186 EmitJitDebugInfoToDisk("jit-emit-debug-to-disk", 187 cl::Hidden, 188 cl::desc("Emit debug info objfiles to disk"), 189 cl::init(false)); 190 } 191 192 static ExecutionEngine *EE = 0; 193 194 static void do_shutdown() { 195 // Cygwin-1.5 invokes DLL's dtors before atexit handler. 196 #ifndef DO_NOTHING_ATEXIT 197 delete EE; 198 llvm_shutdown(); 199 #endif 200 } 201 202 // Memory manager for MCJIT 203 class LLIMCJITMemoryManager : public JITMemoryManager { 204 public: 205 SmallVector<sys::MemoryBlock, 16> AllocatedDataMem; 206 SmallVector<sys::MemoryBlock, 16> AllocatedCodeMem; 207 SmallVector<sys::MemoryBlock, 16> FreeCodeMem; 208 209 LLIMCJITMemoryManager() { } 210 ~LLIMCJITMemoryManager(); 211 212 virtual uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment, 213 unsigned SectionID); 214 215 virtual uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment, 216 unsigned SectionID); 217 218 virtual void *getPointerToNamedFunction(const std::string &Name, 219 bool AbortOnFailure = true); 220 221 // Invalidate instruction cache for code sections. Some platforms with 222 // separate data cache and instruction cache require explicit cache flush, 223 // otherwise JIT code manipulations (like resolved relocations) will get to 224 // the data cache but not to the instruction cache. 225 virtual void invalidateInstructionCache(); 226 227 // The MCJITMemoryManager doesn't use the following functions, so we don't 228 // need implement them. 229 virtual void setMemoryWritable() { 230 llvm_unreachable("Unexpected call!"); 231 } 232 virtual void setMemoryExecutable() { 233 llvm_unreachable("Unexpected call!"); 234 } 235 virtual void setPoisonMemory(bool poison) { 236 llvm_unreachable("Unexpected call!"); 237 } 238 virtual void AllocateGOT() { 239 llvm_unreachable("Unexpected call!"); 240 } 241 virtual uint8_t *getGOTBase() const { 242 llvm_unreachable("Unexpected call!"); 243 return 0; 244 } 245 virtual uint8_t *startFunctionBody(const Function *F, 246 uintptr_t &ActualSize){ 247 llvm_unreachable("Unexpected call!"); 248 return 0; 249 } 250 virtual uint8_t *allocateStub(const GlobalValue* F, unsigned StubSize, 251 unsigned Alignment) { 252 llvm_unreachable("Unexpected call!"); 253 return 0; 254 } 255 virtual void endFunctionBody(const Function *F, uint8_t *FunctionStart, 256 uint8_t *FunctionEnd) { 257 llvm_unreachable("Unexpected call!"); 258 } 259 virtual uint8_t *allocateSpace(intptr_t Size, unsigned Alignment) { 260 llvm_unreachable("Unexpected call!"); 261 return 0; 262 } 263 virtual uint8_t *allocateGlobal(uintptr_t Size, unsigned Alignment) { 264 llvm_unreachable("Unexpected call!"); 265 return 0; 266 } 267 virtual void deallocateFunctionBody(void *Body) { 268 llvm_unreachable("Unexpected call!"); 269 } 270 virtual uint8_t* startExceptionTable(const Function* F, 271 uintptr_t &ActualSize) { 272 llvm_unreachable("Unexpected call!"); 273 return 0; 274 } 275 virtual void endExceptionTable(const Function *F, uint8_t *TableStart, 276 uint8_t *TableEnd, uint8_t* FrameRegister) { 277 llvm_unreachable("Unexpected call!"); 278 } 279 virtual void deallocateExceptionTable(void *ET) { 280 llvm_unreachable("Unexpected call!"); 281 } 282 }; 283 284 uint8_t *LLIMCJITMemoryManager::allocateDataSection(uintptr_t Size, 285 unsigned Alignment, 286 unsigned SectionID) { 287 if (!Alignment) 288 Alignment = 16; 289 uint8_t *Addr = (uint8_t*)calloc((Size + Alignment - 1)/Alignment, Alignment); 290 AllocatedDataMem.push_back(sys::MemoryBlock(Addr, Size)); 291 return Addr; 292 } 293 294 uint8_t *LLIMCJITMemoryManager::allocateCodeSection(uintptr_t Size, 295 unsigned Alignment, 296 unsigned SectionID) { 297 if (!Alignment) 298 Alignment = 16; 299 unsigned NeedAllocate = Alignment * ((Size + Alignment - 1)/Alignment + 1); 300 uintptr_t Addr = 0; 301 // Look in the list of free code memory regions and use a block there if one 302 // is available. 303 for (int i = 0, e = FreeCodeMem.size(); i != e; ++i) { 304 sys::MemoryBlock &MB = FreeCodeMem[i]; 305 if (MB.size() >= NeedAllocate) { 306 Addr = (uintptr_t)MB.base(); 307 uintptr_t EndOfBlock = Addr + MB.size(); 308 // Align the address. 309 Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1); 310 // Store cutted free memory block. 311 FreeCodeMem[i] = sys::MemoryBlock((void*)(Addr + Size), 312 EndOfBlock - Addr - Size); 313 return (uint8_t*)Addr; 314 } 315 } 316 317 // No pre-allocated free block was large enough. Allocate a new memory region. 318 sys::MemoryBlock MB = sys::Memory::AllocateRWX(NeedAllocate, 0, 0); 319 320 AllocatedCodeMem.push_back(MB); 321 Addr = (uintptr_t)MB.base(); 322 uintptr_t EndOfBlock = Addr + MB.size(); 323 // Align the address. 324 Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1); 325 // The AllocateRWX may allocate much more memory than we need. In this case, 326 // we store the unused memory as a free memory block. 327 unsigned FreeSize = EndOfBlock-Addr-Size; 328 if (FreeSize > 16) 329 FreeCodeMem.push_back(sys::MemoryBlock((void*)(Addr + Size), FreeSize)); 330 331 // Return aligned address 332 return (uint8_t*)Addr; 333 } 334 335 void LLIMCJITMemoryManager::invalidateInstructionCache() { 336 for (int i = 0, e = AllocatedCodeMem.size(); i != e; ++i) 337 sys::Memory::InvalidateInstructionCache(AllocatedCodeMem[i].base(), 338 AllocatedCodeMem[i].size()); 339 } 340 341 void *LLIMCJITMemoryManager::getPointerToNamedFunction(const std::string &Name, 342 bool AbortOnFailure) { 343 #if defined(__linux__) 344 //===--------------------------------------------------------------------===// 345 // Function stubs that are invoked instead of certain library calls 346 // 347 // Force the following functions to be linked in to anything that uses the 348 // JIT. This is a hack designed to work around the all-too-clever Glibc 349 // strategy of making these functions work differently when inlined vs. when 350 // not inlined, and hiding their real definitions in a separate archive file 351 // that the dynamic linker can't see. For more info, search for 352 // 'libc_nonshared.a' on Google, or read http://llvm.org/PR274. 353 if (Name == "stat") return (void*)(intptr_t)&stat; 354 if (Name == "fstat") return (void*)(intptr_t)&fstat; 355 if (Name == "lstat") return (void*)(intptr_t)&lstat; 356 if (Name == "stat64") return (void*)(intptr_t)&stat64; 357 if (Name == "fstat64") return (void*)(intptr_t)&fstat64; 358 if (Name == "lstat64") return (void*)(intptr_t)&lstat64; 359 if (Name == "atexit") return (void*)(intptr_t)&atexit; 360 if (Name == "mknod") return (void*)(intptr_t)&mknod; 361 #endif // __linux__ 362 363 const char *NameStr = Name.c_str(); 364 void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr); 365 if (Ptr) return Ptr; 366 367 // If it wasn't found and if it starts with an underscore ('_') character, 368 // try again without the underscore. 369 if (NameStr[0] == '_') { 370 Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr+1); 371 if (Ptr) return Ptr; 372 } 373 374 if (AbortOnFailure) 375 report_fatal_error("Program used external function '" + Name + 376 "' which could not be resolved!"); 377 return 0; 378 } 379 380 LLIMCJITMemoryManager::~LLIMCJITMemoryManager() { 381 for (unsigned i = 0, e = AllocatedCodeMem.size(); i != e; ++i) 382 sys::Memory::ReleaseRWX(AllocatedCodeMem[i]); 383 for (unsigned i = 0, e = AllocatedDataMem.size(); i != e; ++i) 384 free(AllocatedDataMem[i].base()); 385 } 386 387 388 void layoutRemoteTargetMemory(RemoteTarget *T, RecordingMemoryManager *JMM) { 389 // Lay out our sections in order, with all the code sections first, then 390 // all the data sections. 391 uint64_t CurOffset = 0; 392 unsigned MaxAlign = T->getPageAlignment(); 393 SmallVector<std::pair<const void*, uint64_t>, 16> Offsets; 394 SmallVector<unsigned, 16> Sizes; 395 for (RecordingMemoryManager::const_code_iterator I = JMM->code_begin(), 396 E = JMM->code_end(); 397 I != E; ++I) { 398 DEBUG(dbgs() << "code region: size " << I->first.size() 399 << ", alignment " << I->second << "\n"); 400 // Align the current offset up to whatever is needed for the next 401 // section. 402 unsigned Align = I->second; 403 CurOffset = (CurOffset + Align - 1) / Align * Align; 404 // Save off the address of the new section and allocate its space. 405 Offsets.push_back(std::pair<const void*,uint64_t>(I->first.base(), CurOffset)); 406 Sizes.push_back(I->first.size()); 407 CurOffset += I->first.size(); 408 } 409 // Adjust to keep code and data aligned on seperate pages. 410 CurOffset = (CurOffset + MaxAlign - 1) / MaxAlign * MaxAlign; 411 unsigned FirstDataIndex = Offsets.size(); 412 for (RecordingMemoryManager::const_data_iterator I = JMM->data_begin(), 413 E = JMM->data_end(); 414 I != E; ++I) { 415 DEBUG(dbgs() << "data region: size " << I->first.size() 416 << ", alignment " << I->second << "\n"); 417 // Align the current offset up to whatever is needed for the next 418 // section. 419 unsigned Align = I->second; 420 CurOffset = (CurOffset + Align - 1) / Align * Align; 421 // Save off the address of the new section and allocate its space. 422 Offsets.push_back(std::pair<const void*,uint64_t>(I->first.base(), CurOffset)); 423 Sizes.push_back(I->first.size()); 424 CurOffset += I->first.size(); 425 } 426 427 // Allocate space in the remote target. 428 uint64_t RemoteAddr; 429 if (T->allocateSpace(CurOffset, MaxAlign, RemoteAddr)) 430 report_fatal_error(T->getErrorMsg()); 431 // Map the section addresses so relocations will get updated in the local 432 // copies of the sections. 433 for (unsigned i = 0, e = Offsets.size(); i != e; ++i) { 434 uint64_t Addr = RemoteAddr + Offsets[i].second; 435 EE->mapSectionAddress(const_cast<void*>(Offsets[i].first), Addr); 436 437 DEBUG(dbgs() << " Mapping local: " << Offsets[i].first 438 << " to remote: " << format("%#018x", Addr) << "\n"); 439 440 } 441 // Now load it all to the target. 442 for (unsigned i = 0, e = Offsets.size(); i != e; ++i) { 443 uint64_t Addr = RemoteAddr + Offsets[i].second; 444 445 if (i < FirstDataIndex) { 446 T->loadCode(Addr, Offsets[i].first, Sizes[i]); 447 448 DEBUG(dbgs() << " loading code: " << Offsets[i].first 449 << " to remote: " << format("%#018x", Addr) << "\n"); 450 } else { 451 T->loadData(Addr, Offsets[i].first, Sizes[i]); 452 453 DEBUG(dbgs() << " loading data: " << Offsets[i].first 454 << " to remote: " << format("%#018x", Addr) << "\n"); 455 } 456 457 } 458 } 459 460 //===----------------------------------------------------------------------===// 461 // main Driver function 462 // 463 int main(int argc, char **argv, char * const *envp) { 464 sys::PrintStackTraceOnErrorSignal(); 465 PrettyStackTraceProgram X(argc, argv); 466 467 LLVMContext &Context = getGlobalContext(); 468 atexit(do_shutdown); // Call llvm_shutdown() on exit. 469 470 // If we have a native target, initialize it to ensure it is linked in and 471 // usable by the JIT. 472 InitializeNativeTarget(); 473 InitializeNativeTargetAsmPrinter(); 474 475 cl::ParseCommandLineOptions(argc, argv, 476 "llvm interpreter & dynamic compiler\n"); 477 478 // If the user doesn't want core files, disable them. 479 if (DisableCoreFiles) 480 sys::Process::PreventCoreFiles(); 481 482 // Load the bitcode... 483 SMDiagnostic Err; 484 Module *Mod = ParseIRFile(InputFile, Err, Context); 485 if (!Mod) { 486 Err.print(argv[0], errs()); 487 return 1; 488 } 489 490 // If not jitting lazily, load the whole bitcode file eagerly too. 491 std::string ErrorMsg; 492 if (NoLazyCompilation) { 493 if (Mod->MaterializeAllPermanently(&ErrorMsg)) { 494 errs() << argv[0] << ": bitcode didn't read correctly.\n"; 495 errs() << "Reason: " << ErrorMsg << "\n"; 496 exit(1); 497 } 498 } 499 500 EngineBuilder builder(Mod); 501 builder.setMArch(MArch); 502 builder.setMCPU(MCPU); 503 builder.setMAttrs(MAttrs); 504 builder.setRelocationModel(RelocModel); 505 builder.setCodeModel(CMModel); 506 builder.setErrorStr(&ErrorMsg); 507 builder.setEngineKind(ForceInterpreter 508 ? EngineKind::Interpreter 509 : EngineKind::JIT); 510 511 // If we are supposed to override the target triple, do so now. 512 if (!TargetTriple.empty()) 513 Mod->setTargetTriple(Triple::normalize(TargetTriple)); 514 515 // Enable MCJIT if desired. 516 JITMemoryManager *JMM = 0; 517 if (UseMCJIT && !ForceInterpreter) { 518 builder.setUseMCJIT(true); 519 if (RemoteMCJIT) 520 JMM = new RecordingMemoryManager(); 521 else 522 JMM = new LLIMCJITMemoryManager(); 523 builder.setJITMemoryManager(JMM); 524 } else { 525 if (RemoteMCJIT) { 526 errs() << "error: Remote process execution requires -use-mcjit\n"; 527 exit(1); 528 } 529 builder.setJITMemoryManager(ForceInterpreter ? 0 : 530 JITMemoryManager::CreateDefaultMemManager()); 531 } 532 533 CodeGenOpt::Level OLvl = CodeGenOpt::Default; 534 switch (OptLevel) { 535 default: 536 errs() << argv[0] << ": invalid optimization level.\n"; 537 return 1; 538 case ' ': break; 539 case '0': OLvl = CodeGenOpt::None; break; 540 case '1': OLvl = CodeGenOpt::Less; break; 541 case '2': OLvl = CodeGenOpt::Default; break; 542 case '3': OLvl = CodeGenOpt::Aggressive; break; 543 } 544 builder.setOptLevel(OLvl); 545 546 // Remote target execution doesn't handle EH or debug registration. 547 if (!RemoteMCJIT) { 548 TargetOptions Options; 549 Options.JITExceptionHandling = EnableJITExceptionHandling; 550 Options.JITEmitDebugInfo = EmitJitDebugInfo; 551 Options.JITEmitDebugInfoToDisk = EmitJitDebugInfoToDisk; 552 builder.setTargetOptions(Options); 553 } 554 555 EE = builder.create(); 556 if (!EE) { 557 if (!ErrorMsg.empty()) 558 errs() << argv[0] << ": error creating EE: " << ErrorMsg << "\n"; 559 else 560 errs() << argv[0] << ": unknown error creating EE!\n"; 561 exit(1); 562 } 563 564 // The following functions have no effect if their respective profiling 565 // support wasn't enabled in the build configuration. 566 EE->RegisterJITEventListener( 567 JITEventListener::createOProfileJITEventListener()); 568 EE->RegisterJITEventListener( 569 JITEventListener::createIntelJITEventListener()); 570 571 if (!NoLazyCompilation && RemoteMCJIT) { 572 errs() << "warning: remote mcjit does not support lazy compilation\n"; 573 NoLazyCompilation = true; 574 } 575 EE->DisableLazyCompilation(NoLazyCompilation); 576 577 // If the user specifically requested an argv[0] to pass into the program, 578 // do it now. 579 if (!FakeArgv0.empty()) { 580 InputFile = FakeArgv0; 581 } else { 582 // Otherwise, if there is a .bc suffix on the executable strip it off, it 583 // might confuse the program. 584 if (StringRef(InputFile).endswith(".bc")) 585 InputFile.erase(InputFile.length() - 3); 586 } 587 588 // Add the module's name to the start of the vector of arguments to main(). 589 InputArgv.insert(InputArgv.begin(), InputFile); 590 591 // Call the main function from M as if its signature were: 592 // int main (int argc, char **argv, const char **envp) 593 // using the contents of Args to determine argc & argv, and the contents of 594 // EnvVars to determine envp. 595 // 596 Function *EntryFn = Mod->getFunction(EntryFunc); 597 if (!EntryFn) { 598 errs() << '\'' << EntryFunc << "\' function not found in module.\n"; 599 return -1; 600 } 601 602 // If the program doesn't explicitly call exit, we will need the Exit 603 // function later on to make an explicit call, so get the function now. 604 Constant *Exit = Mod->getOrInsertFunction("exit", Type::getVoidTy(Context), 605 Type::getInt32Ty(Context), 606 NULL); 607 608 // Reset errno to zero on entry to main. 609 errno = 0; 610 611 // Remote target MCJIT doesn't (yet) support static constructors. No reason 612 // it couldn't. This is a limitation of the LLI implemantation, not the 613 // MCJIT itself. FIXME. 614 // 615 // Run static constructors. 616 if (!RemoteMCJIT) 617 EE->runStaticConstructorsDestructors(false); 618 619 if (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 int Result; 628 if (RemoteMCJIT) { 629 RecordingMemoryManager *MM = static_cast<RecordingMemoryManager*>(JMM); 630 // Everything is prepared now, so lay out our program for the target 631 // address space, assign the section addresses to resolve any relocations, 632 // and send it to the target. 633 RemoteTarget Target; 634 Target.create(); 635 636 // Ask for a pointer to the entry function. This triggers the actual 637 // compilation. 638 (void)EE->getPointerToFunction(EntryFn); 639 640 // Enough has been compiled to execute the entry function now, so 641 // layout the target memory. 642 layoutRemoteTargetMemory(&Target, MM); 643 644 // Since we're executing in a (at least simulated) remote address space, 645 // we can't use the ExecutionEngine::runFunctionAsMain(). We have to 646 // grab the function address directly here and tell the remote target 647 // to execute the function. 648 // FIXME: argv and envp handling. 649 uint64_t Entry = (uint64_t)EE->getPointerToFunction(EntryFn); 650 651 DEBUG(dbgs() << "Executing '" << EntryFn->getName() << "' at " 652 << format("%#18x", Entry) << "\n"); 653 654 if (Target.executeCode(Entry, Result)) 655 errs() << "ERROR: " << Target.getErrorMsg() << "\n"; 656 657 Target.stop(); 658 } else { 659 // Clear instruction cache before code will be executed. 660 if (JMM) 661 static_cast<LLIMCJITMemoryManager*>(JMM)->invalidateInstructionCache(); 662 663 // Run main. 664 Result = EE->runFunctionAsMain(EntryFn, InputArgv, envp); 665 } 666 667 // Like static constructors, the remote target MCJIT support doesn't handle 668 // this yet. It could. FIXME. 669 if (!RemoteMCJIT) { 670 // Run static destructors. 671 EE->runStaticConstructorsDestructors(true); 672 673 // If the program didn't call exit explicitly, we should call it now. 674 // This ensures that any atexit handlers get called correctly. 675 if (Function *ExitF = dyn_cast<Function>(Exit)) { 676 std::vector<GenericValue> Args; 677 GenericValue ResultGV; 678 ResultGV.IntVal = APInt(32, Result); 679 Args.push_back(ResultGV); 680 EE->runFunction(ExitF, Args); 681 errs() << "ERROR: exit(" << Result << ") returned!\n"; 682 abort(); 683 } else { 684 errs() << "ERROR: exit defined with wrong prototype!\n"; 685 abort(); 686 } 687 } 688 return Result; 689 } 690
