1 //===- llvm-ld.cpp - LLVM 'ld' compatible linker --------------------------===// 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 is intended to be compatible with GCC, and follows standard 11 // system 'ld' conventions. As such, the default output file is ./a.out. 12 // Additionally, this program outputs a shell script that is used to invoke LLI 13 // to execute the program. In this manner, the generated executable (a.out for 14 // example), is directly executable, whereas the bitcode file actually lives in 15 // the a.out.bc file generated by this program. 16 // 17 // Note that if someone (or a script) deletes the executable program generated, 18 // the .bc file will be left around. Considering that this is a temporary hack, 19 // I'm not too worried about this. 20 // 21 //===----------------------------------------------------------------------===// 22 23 #include "llvm/LinkAllVMCore.h" 24 #include "llvm/Linker.h" 25 #include "llvm/LLVMContext.h" 26 #include "llvm/Support/Program.h" 27 #include "llvm/Module.h" 28 #include "llvm/PassManager.h" 29 #include "llvm/Bitcode/ReaderWriter.h" 30 #include "llvm/Target/TargetData.h" 31 #include "llvm/Target/TargetMachine.h" 32 #include "llvm/Support/CommandLine.h" 33 #include "llvm/Support/FileUtilities.h" 34 #include "llvm/Support/ManagedStatic.h" 35 #include "llvm/Support/MemoryBuffer.h" 36 #include "llvm/Support/PrettyStackTrace.h" 37 #include "llvm/Support/SystemUtils.h" 38 #include "llvm/Support/ToolOutputFile.h" 39 #include "llvm/Support/Signals.h" 40 #include <memory> 41 #include <cstring> 42 using namespace llvm; 43 44 // Rightly this should go in a header file but it just seems such a waste. 45 namespace llvm { 46 extern void Optimize(Module*); 47 } 48 49 // Input/Output Options 50 static cl::list<std::string> InputFilenames(cl::Positional, cl::OneOrMore, 51 cl::desc("<input bitcode files>")); 52 53 static cl::opt<std::string> OutputFilename("o", cl::init("a.out"), 54 cl::desc("Override output filename"), 55 cl::value_desc("filename")); 56 57 static cl::opt<std::string> BitcodeOutputFilename("b", cl::init(""), 58 cl::desc("Override bitcode output filename"), 59 cl::value_desc("filename")); 60 61 static cl::opt<bool> Verbose("v", 62 cl::desc("Print information about actions taken")); 63 64 static cl::list<std::string> LibPaths("L", cl::Prefix, 65 cl::desc("Specify a library search path"), 66 cl::value_desc("directory")); 67 68 static cl::list<std::string> FrameworkPaths("F", cl::Prefix, 69 cl::desc("Specify a framework search path"), 70 cl::value_desc("directory")); 71 72 static cl::list<std::string> Libraries("l", cl::Prefix, 73 cl::desc("Specify libraries to link to"), 74 cl::value_desc("library prefix")); 75 76 static cl::list<std::string> Frameworks("framework", 77 cl::desc("Specify frameworks to link to"), 78 cl::value_desc("framework")); 79 80 // Options to control the linking, optimization, and code gen processes 81 static cl::opt<bool> LinkAsLibrary("link-as-library", 82 cl::desc("Link the .bc files together as a library, not an executable")); 83 84 static cl::alias Relink("r", cl::aliasopt(LinkAsLibrary), 85 cl::desc("Alias for -link-as-library")); 86 87 static cl::opt<bool> Native("native", 88 cl::desc("Generate a native binary instead of a shell script")); 89 90 static cl::opt<bool>NativeCBE("native-cbe", 91 cl::desc("Generate a native binary with the C backend and GCC")); 92 93 static cl::list<std::string> PostLinkOpts("post-link-opts", 94 cl::value_desc("path"), 95 cl::desc("Run one or more optimization programs after linking")); 96 97 static cl::list<std::string> XLinker("Xlinker", cl::value_desc("option"), 98 cl::desc("Pass options to the system linker")); 99 100 // Compatibility options that llvm-ld ignores but are supported for 101 // compatibility with LD 102 static cl::opt<std::string> CO3("soname", cl::Hidden, 103 cl::desc("Compatibility option: ignored")); 104 105 static cl::opt<std::string> CO4("version-script", cl::Hidden, 106 cl::desc("Compatibility option: ignored")); 107 108 static cl::opt<bool> CO5("eh-frame-hdr", cl::Hidden, 109 cl::desc("Compatibility option: ignored")); 110 111 static cl::opt<std::string> CO6("h", cl::Hidden, 112 cl::desc("Compatibility option: ignored")); 113 114 static cl::opt<bool> CO7("start-group", cl::Hidden, 115 cl::desc("Compatibility option: ignored")); 116 117 static cl::opt<bool> CO8("end-group", cl::Hidden, 118 cl::desc("Compatibility option: ignored")); 119 120 static cl::opt<std::string> CO9("m", cl::Hidden, 121 cl::desc("Compatibility option: ignored")); 122 123 /// This is just for convenience so it doesn't have to be passed around 124 /// everywhere. 125 static std::string progname; 126 127 /// FileRemover objects to clean up output files in the event of an error. 128 static FileRemover OutputRemover; 129 static FileRemover BitcodeOutputRemover; 130 131 /// PrintAndExit - Prints a message to standard error and exits with error code 132 /// 133 /// Inputs: 134 /// Message - The message to print to standard error. 135 /// 136 static void PrintAndExit(const std::string &Message, Module *M, int errcode = 1) { 137 errs() << progname << ": " << Message << "\n"; 138 delete M; 139 llvm_shutdown(); 140 exit(errcode); 141 } 142 143 static void PrintCommand(const std::vector<const char*> &args) { 144 std::vector<const char*>::const_iterator I = args.begin(), E = args.end(); 145 for (; I != E; ++I) 146 if (*I) 147 errs() << "'" << *I << "'" << " "; 148 errs() << "\n"; 149 } 150 151 /// CopyEnv - This function takes an array of environment variables and makes a 152 /// copy of it. This copy can then be manipulated any way the caller likes 153 /// without affecting the process's real environment. 154 /// 155 /// Inputs: 156 /// envp - An array of C strings containing an environment. 157 /// 158 /// Return value: 159 /// NULL - An error occurred. 160 /// 161 /// Otherwise, a pointer to a new array of C strings is returned. Every string 162 /// in the array is a duplicate of the one in the original array (i.e. we do 163 /// not copy the char *'s from one array to another). 164 /// 165 static char ** CopyEnv(char ** const envp) { 166 // Count the number of entries in the old list; 167 unsigned entries; // The number of entries in the old environment list 168 for (entries = 0; envp[entries] != NULL; entries++) 169 /*empty*/; 170 171 // Add one more entry for the NULL pointer that ends the list. 172 ++entries; 173 174 // If there are no entries at all, just return NULL. 175 if (entries == 0) 176 return NULL; 177 178 // Allocate a new environment list. 179 char **newenv = new char* [entries]; 180 if (newenv == NULL) 181 return NULL; 182 183 // Make a copy of the list. Don't forget the NULL that ends the list. 184 entries = 0; 185 while (envp[entries] != NULL) { 186 size_t len = strlen(envp[entries]) + 1; 187 newenv[entries] = new char[len]; 188 memcpy(newenv[entries], envp[entries], len); 189 ++entries; 190 } 191 newenv[entries] = NULL; 192 193 return newenv; 194 } 195 196 197 /// RemoveEnv - Remove the specified environment variable from the environment 198 /// array. 199 /// 200 /// Inputs: 201 /// name - The name of the variable to remove. It cannot be NULL. 202 /// envp - The array of environment variables. It cannot be NULL. 203 /// 204 /// Notes: 205 /// This is mainly done because functions to remove items from the environment 206 /// are not available across all platforms. In particular, Solaris does not 207 /// seem to have an unsetenv() function or a setenv() function (or they are 208 /// undocumented if they do exist). 209 /// 210 static void RemoveEnv(const char * name, char ** const envp) { 211 for (unsigned index=0; envp[index] != NULL; index++) { 212 // Find the first equals sign in the array and make it an EOS character. 213 char *p = strchr (envp[index], '='); 214 if (p == NULL) 215 continue; 216 else 217 *p = '\0'; 218 219 // Compare the two strings. If they are equal, zap this string. 220 // Otherwise, restore it. 221 if (!strcmp(name, envp[index])) 222 *envp[index] = '\0'; 223 else 224 *p = '='; 225 } 226 227 return; 228 } 229 230 /// GenerateBitcode - generates a bitcode file from the module provided 231 void GenerateBitcode(Module* M, const std::string& FileName) { 232 233 if (Verbose) 234 errs() << "Generating Bitcode To " << FileName << '\n'; 235 236 // Create the output file. 237 std::string ErrorInfo; 238 tool_output_file Out(FileName.c_str(), ErrorInfo, 239 raw_fd_ostream::F_Binary); 240 if (!ErrorInfo.empty()) { 241 PrintAndExit(ErrorInfo, M); 242 return; 243 } 244 245 // Write it out 246 WriteBitcodeToFile(M, Out.os()); 247 Out.keep(); 248 } 249 250 /// GenerateAssembly - generates a native assembly language source file from the 251 /// specified bitcode file. 252 /// 253 /// Inputs: 254 /// InputFilename - The name of the input bitcode file. 255 /// OutputFilename - The name of the file to generate. 256 /// llc - The pathname to use for LLC. 257 /// envp - The environment to use when running LLC. 258 /// 259 /// Return non-zero value on error. 260 /// 261 static int GenerateAssembly(const std::string &OutputFilename, 262 const std::string &InputFilename, 263 const sys::Path &llc, 264 std::string &ErrMsg ) { 265 // Run LLC to convert the bitcode file into assembly code. 266 std::vector<const char*> args; 267 args.push_back(llc.c_str()); 268 // We will use GCC to assemble the program so set the assembly syntax to AT&T, 269 // regardless of what the target in the bitcode file is. 270 args.push_back("-x86-asm-syntax=att"); 271 args.push_back("-o"); 272 args.push_back(OutputFilename.c_str()); 273 args.push_back(InputFilename.c_str()); 274 args.push_back(0); 275 276 if (Verbose) { 277 errs() << "Generating Assembly With: \n"; 278 PrintCommand(args); 279 } 280 281 return sys::Program::ExecuteAndWait(llc, &args[0], 0, 0, 0, 0, &ErrMsg); 282 } 283 284 /// GenerateCFile - generates a C source file from the specified bitcode file. 285 static int GenerateCFile(const std::string &OutputFile, 286 const std::string &InputFile, 287 const sys::Path &llc, 288 std::string& ErrMsg) { 289 // Run LLC to convert the bitcode file into C. 290 std::vector<const char*> args; 291 args.push_back(llc.c_str()); 292 args.push_back("-march=c"); 293 args.push_back("-o"); 294 args.push_back(OutputFile.c_str()); 295 args.push_back(InputFile.c_str()); 296 args.push_back(0); 297 298 if (Verbose) { 299 errs() << "Generating C Source With: \n"; 300 PrintCommand(args); 301 } 302 303 return sys::Program::ExecuteAndWait(llc, &args[0], 0, 0, 0, 0, &ErrMsg); 304 } 305 306 /// GenerateNative - generates a native object file from the 307 /// specified bitcode file. 308 /// 309 /// Inputs: 310 /// InputFilename - The name of the input bitcode file. 311 /// OutputFilename - The name of the file to generate. 312 /// NativeLinkItems - The native libraries, files, code with which to link 313 /// LibPaths - The list of directories in which to find libraries. 314 /// FrameworksPaths - The list of directories in which to find frameworks. 315 /// Frameworks - The list of frameworks (dynamic libraries) 316 /// gcc - The pathname to use for GGC. 317 /// envp - A copy of the process's current environment. 318 /// 319 /// Outputs: 320 /// None. 321 /// 322 /// Returns non-zero value on error. 323 /// 324 static int GenerateNative(const std::string &OutputFilename, 325 const std::string &InputFilename, 326 const Linker::ItemList &LinkItems, 327 const sys::Path &gcc, char ** const envp, 328 std::string& ErrMsg) { 329 // Remove these environment variables from the environment of the 330 // programs that we will execute. It appears that GCC sets these 331 // environment variables so that the programs it uses can configure 332 // themselves identically. 333 // 334 // However, when we invoke GCC below, we want it to use its normal 335 // configuration. Hence, we must sanitize its environment. 336 char ** clean_env = CopyEnv(envp); 337 if (clean_env == NULL) 338 return 1; 339 RemoveEnv("LIBRARY_PATH", clean_env); 340 RemoveEnv("COLLECT_GCC_OPTIONS", clean_env); 341 RemoveEnv("GCC_EXEC_PREFIX", clean_env); 342 RemoveEnv("COMPILER_PATH", clean_env); 343 RemoveEnv("COLLECT_GCC", clean_env); 344 345 346 // Run GCC to assemble and link the program into native code. 347 // 348 // Note: 349 // We can't just assemble and link the file with the system assembler 350 // and linker because we don't know where to put the _start symbol. 351 // GCC mysteriously knows how to do it. 352 std::vector<std::string> args; 353 args.push_back(gcc.c_str()); 354 args.push_back("-fno-strict-aliasing"); 355 args.push_back("-O3"); 356 args.push_back("-o"); 357 args.push_back(OutputFilename); 358 args.push_back(InputFilename); 359 360 // Add in the library and framework paths 361 for (unsigned index = 0; index < LibPaths.size(); index++) { 362 args.push_back("-L" + LibPaths[index]); 363 } 364 for (unsigned index = 0; index < FrameworkPaths.size(); index++) { 365 args.push_back("-F" + FrameworkPaths[index]); 366 } 367 368 // Add the requested options 369 for (unsigned index = 0; index < XLinker.size(); index++) 370 args.push_back(XLinker[index]); 371 372 // Add in the libraries to link. 373 for (unsigned index = 0; index < LinkItems.size(); index++) 374 if (LinkItems[index].first != "crtend") { 375 if (LinkItems[index].second) 376 args.push_back("-l" + LinkItems[index].first); 377 else 378 args.push_back(LinkItems[index].first); 379 } 380 381 // Add in frameworks to link. 382 for (unsigned index = 0; index < Frameworks.size(); index++) { 383 args.push_back("-framework"); 384 args.push_back(Frameworks[index]); 385 } 386 387 // Now that "args" owns all the std::strings for the arguments, call the c_str 388 // method to get the underlying string array. We do this game so that the 389 // std::string array is guaranteed to outlive the const char* array. 390 std::vector<const char *> Args; 391 for (unsigned i = 0, e = args.size(); i != e; ++i) 392 Args.push_back(args[i].c_str()); 393 Args.push_back(0); 394 395 if (Verbose) { 396 errs() << "Generating Native Executable With:\n"; 397 PrintCommand(Args); 398 } 399 400 // Run the compiler to assembly and link together the program. 401 int R = sys::Program::ExecuteAndWait( 402 gcc, &Args[0], const_cast<const char **>(clean_env), 0, 0, 0, &ErrMsg); 403 delete [] clean_env; 404 return R; 405 } 406 407 /// EmitShellScript - Output the wrapper file that invokes the JIT on the LLVM 408 /// bitcode file for the program. 409 static void EmitShellScript(char **argv, Module *M) { 410 if (Verbose) 411 errs() << "Emitting Shell Script\n"; 412 #if defined(_WIN32) 413 // Windows doesn't support #!/bin/sh style shell scripts in .exe files. To 414 // support windows systems, we copy the llvm-stub.exe executable from the 415 // build tree to the destination file. 416 std::string ErrMsg; 417 sys::Path llvmstub = PrependMainExecutablePath("llvm-stub", argv[0], 418 (void *)(intptr_t)&Optimize); 419 if (llvmstub.isEmpty()) 420 PrintAndExit("Could not find llvm-stub.exe executable!", M); 421 422 if (0 != sys::CopyFile(sys::Path(OutputFilename), llvmstub, &ErrMsg)) 423 PrintAndExit(ErrMsg, M); 424 425 return; 426 #else 427 428 // Output the script to start the program... 429 std::string ErrorInfo; 430 tool_output_file Out2(OutputFilename.c_str(), ErrorInfo); 431 if (!ErrorInfo.empty()) 432 PrintAndExit(ErrorInfo, M); 433 434 Out2.os() << "#!/bin/sh\n"; 435 // Allow user to setenv LLVMINTERP if lli is not in their PATH. 436 Out2.os() << "lli=${LLVMINTERP-lli}\n"; 437 Out2.os() << "exec $lli \\\n"; 438 // gcc accepts -l<lib> and implicitly searches /lib and /usr/lib. 439 LibPaths.push_back("/lib"); 440 LibPaths.push_back("/usr/lib"); 441 LibPaths.push_back("/usr/X11R6/lib"); 442 // We don't need to link in libc! In fact, /usr/lib/libc.so may not be a 443 // shared object at all! See RH 8: plain text. 444 std::vector<std::string>::iterator libc = 445 std::find(Libraries.begin(), Libraries.end(), "c"); 446 if (libc != Libraries.end()) Libraries.erase(libc); 447 // List all the shared object (native) libraries this executable will need 448 // on the command line, so that we don't have to do this manually! 449 for (std::vector<std::string>::iterator i = Libraries.begin(), 450 e = Libraries.end(); i != e; ++i) { 451 // try explicit -L arguments first: 452 sys::Path FullLibraryPath; 453 for (cl::list<std::string>::const_iterator P = LibPaths.begin(), 454 E = LibPaths.end(); P != E; ++P) { 455 FullLibraryPath = *P; 456 FullLibraryPath.appendComponent("lib" + *i); 457 FullLibraryPath.appendSuffix(sys::Path::GetDLLSuffix()); 458 if (!FullLibraryPath.isEmpty()) { 459 if (!FullLibraryPath.isDynamicLibrary()) { 460 // Not a native shared library; mark as invalid 461 FullLibraryPath = sys::Path(); 462 } else break; 463 } 464 } 465 if (FullLibraryPath.isEmpty()) 466 FullLibraryPath = sys::Path::FindLibrary(*i); 467 if (!FullLibraryPath.isEmpty()) 468 Out2.os() << " -load=" << FullLibraryPath.str() << " \\\n"; 469 } 470 Out2.os() << " " << BitcodeOutputFilename << " ${1+\"$@\"}\n"; 471 Out2.keep(); 472 #endif 473 } 474 475 // BuildLinkItems -- This function generates a LinkItemList for the LinkItems 476 // linker function by combining the Files and Libraries in the order they were 477 // declared on the command line. 478 static void BuildLinkItems( 479 Linker::ItemList& Items, 480 const cl::list<std::string>& Files, 481 const cl::list<std::string>& Libraries) { 482 483 // Build the list of linkage items for LinkItems. 484 485 cl::list<std::string>::const_iterator fileIt = Files.begin(); 486 cl::list<std::string>::const_iterator libIt = Libraries.begin(); 487 488 int libPos = -1, filePos = -1; 489 while ( libIt != Libraries.end() || fileIt != Files.end() ) { 490 if (libIt != Libraries.end()) 491 libPos = Libraries.getPosition(libIt - Libraries.begin()); 492 else 493 libPos = -1; 494 if (fileIt != Files.end()) 495 filePos = Files.getPosition(fileIt - Files.begin()); 496 else 497 filePos = -1; 498 499 if (filePos != -1 && (libPos == -1 || filePos < libPos)) { 500 // Add a source file 501 Items.push_back(std::make_pair(*fileIt++, false)); 502 } else if (libPos != -1 && (filePos == -1 || libPos < filePos)) { 503 // Add a library 504 Items.push_back(std::make_pair(*libIt++, true)); 505 } 506 } 507 } 508 509 int main(int argc, char **argv, char **envp) { 510 // Print a stack trace if we signal out. 511 sys::PrintStackTraceOnErrorSignal(); 512 PrettyStackTraceProgram X(argc, argv); 513 514 LLVMContext &Context = getGlobalContext(); 515 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 516 517 // Initialize passes 518 PassRegistry &Registry = *PassRegistry::getPassRegistry(); 519 initializeCore(Registry); 520 initializeScalarOpts(Registry); 521 initializeIPO(Registry); 522 initializeAnalysis(Registry); 523 initializeIPA(Registry); 524 initializeTransformUtils(Registry); 525 initializeInstCombine(Registry); 526 initializeTarget(Registry); 527 528 // Initial global variable above for convenience printing of program name. 529 progname = sys::path::stem(argv[0]); 530 531 // Parse the command line options 532 cl::ParseCommandLineOptions(argc, argv, "llvm linker\n"); 533 534 #if defined(_WIN32) || defined(__CYGWIN__) 535 if (!LinkAsLibrary) { 536 // Default to "a.exe" instead of "a.out". 537 if (OutputFilename.getNumOccurrences() == 0) 538 OutputFilename = "a.exe"; 539 540 // If there is no suffix add an "exe" one. 541 if (sys::path::extension(OutputFilename).empty()) 542 OutputFilename.append(".exe"); 543 } 544 #endif 545 546 // Generate the bitcode for the optimized module. 547 // If -b wasn't specified, use the name specified 548 // with -o to construct BitcodeOutputFilename. 549 if (BitcodeOutputFilename.empty()) { 550 BitcodeOutputFilename = OutputFilename; 551 if (!LinkAsLibrary) BitcodeOutputFilename += ".bc"; 552 } 553 554 // Arrange for the bitcode output file to be deleted on any errors. 555 BitcodeOutputRemover.setFile(BitcodeOutputFilename); 556 sys::RemoveFileOnSignal(sys::Path(BitcodeOutputFilename)); 557 558 // Arrange for the output file to be deleted on any errors. 559 if (!LinkAsLibrary) { 560 OutputRemover.setFile(OutputFilename); 561 sys::RemoveFileOnSignal(sys::Path(OutputFilename)); 562 } 563 564 // Construct a Linker (now that Verbose is set) 565 Linker TheLinker(progname, OutputFilename, Context, Verbose); 566 567 // Keep track of the native link items (versus the bitcode items) 568 Linker::ItemList NativeLinkItems; 569 570 // Add library paths to the linker 571 TheLinker.addPaths(LibPaths); 572 TheLinker.addSystemPaths(); 573 574 // Remove any consecutive duplicates of the same library... 575 Libraries.erase(std::unique(Libraries.begin(), Libraries.end()), 576 Libraries.end()); 577 578 if (LinkAsLibrary) { 579 std::vector<sys::Path> Files; 580 for (unsigned i = 0; i < InputFilenames.size(); ++i ) 581 Files.push_back(sys::Path(InputFilenames[i])); 582 if (TheLinker.LinkInFiles(Files)) 583 return 1; // Error already printed 584 585 // The libraries aren't linked in but are noted as "dependent" in the 586 // module. 587 for (cl::list<std::string>::const_iterator I = Libraries.begin(), 588 E = Libraries.end(); I != E ; ++I) { 589 TheLinker.getModule()->addLibrary(*I); 590 } 591 } else { 592 // Build a list of the items from our command line 593 Linker::ItemList Items; 594 BuildLinkItems(Items, InputFilenames, Libraries); 595 596 // Link all the items together 597 if (TheLinker.LinkInItems(Items, NativeLinkItems) ) 598 return 1; // Error already printed 599 } 600 601 std::auto_ptr<Module> Composite(TheLinker.releaseModule()); 602 603 // Optimize the module 604 Optimize(Composite.get()); 605 606 // Generate the bitcode output. 607 GenerateBitcode(Composite.get(), BitcodeOutputFilename); 608 609 // If we are not linking a library, generate either a native executable 610 // or a JIT shell script, depending upon what the user wants. 611 if (!LinkAsLibrary) { 612 // If the user wants to run a post-link optimization, run it now. 613 if (!PostLinkOpts.empty()) { 614 std::vector<std::string> opts = PostLinkOpts; 615 for (std::vector<std::string>::iterator I = opts.begin(), 616 E = opts.end(); I != E; ++I) { 617 sys::Path prog(*I); 618 if (!prog.canExecute()) { 619 prog = sys::Program::FindProgramByName(*I); 620 if (prog.isEmpty()) 621 PrintAndExit(std::string("Optimization program '") + *I + 622 "' is not found or not executable.", Composite.get()); 623 } 624 // Get the program arguments 625 sys::Path tmp_output("opt_result"); 626 std::string ErrMsg; 627 if (tmp_output.createTemporaryFileOnDisk(true, &ErrMsg)) 628 PrintAndExit(ErrMsg, Composite.get()); 629 630 const char* args[4]; 631 args[0] = I->c_str(); 632 args[1] = BitcodeOutputFilename.c_str(); 633 args[2] = tmp_output.c_str(); 634 args[3] = 0; 635 if (0 == sys::Program::ExecuteAndWait(prog, args, 0,0,0,0, &ErrMsg)) { 636 if (tmp_output.isBitcodeFile()) { 637 sys::Path target(BitcodeOutputFilename); 638 target.eraseFromDisk(); 639 if (tmp_output.renamePathOnDisk(target, &ErrMsg)) 640 PrintAndExit(ErrMsg, Composite.get(), 2); 641 } else 642 PrintAndExit("Post-link optimization output is not bitcode", 643 Composite.get()); 644 } else { 645 PrintAndExit(ErrMsg, Composite.get()); 646 } 647 } 648 } 649 650 // If the user wants to generate a native executable, compile it from the 651 // bitcode file. 652 // 653 // Otherwise, create a script that will run the bitcode through the JIT. 654 if (Native) { 655 // Name of the Assembly Language output file 656 sys::Path AssemblyFile ( OutputFilename); 657 AssemblyFile.appendSuffix("s"); 658 659 // Mark the output files for removal. 660 FileRemover AssemblyFileRemover(AssemblyFile.str()); 661 sys::RemoveFileOnSignal(AssemblyFile); 662 663 // Determine the locations of the llc and gcc programs. 664 sys::Path llc = PrependMainExecutablePath("llc", argv[0], 665 (void *)(intptr_t)&Optimize); 666 if (llc.isEmpty()) 667 PrintAndExit("Failed to find llc", Composite.get()); 668 669 sys::Path gcc = sys::Program::FindProgramByName("gcc"); 670 if (gcc.isEmpty()) 671 PrintAndExit("Failed to find gcc", Composite.get()); 672 673 // Generate an assembly language file for the bitcode. 674 std::string ErrMsg; 675 if (0 != GenerateAssembly(AssemblyFile.str(), BitcodeOutputFilename, 676 llc, ErrMsg)) 677 PrintAndExit(ErrMsg, Composite.get()); 678 679 if (0 != GenerateNative(OutputFilename, AssemblyFile.str(), 680 NativeLinkItems, gcc, envp, ErrMsg)) 681 PrintAndExit(ErrMsg, Composite.get()); 682 } else if (NativeCBE) { 683 sys::Path CFile (OutputFilename); 684 CFile.appendSuffix("cbe.c"); 685 686 // Mark the output files for removal. 687 FileRemover CFileRemover(CFile.str()); 688 sys::RemoveFileOnSignal(CFile); 689 690 // Determine the locations of the llc and gcc programs. 691 sys::Path llc = PrependMainExecutablePath("llc", argv[0], 692 (void *)(intptr_t)&Optimize); 693 if (llc.isEmpty()) 694 PrintAndExit("Failed to find llc", Composite.get()); 695 696 sys::Path gcc = sys::Program::FindProgramByName("gcc"); 697 if (gcc.isEmpty()) 698 PrintAndExit("Failed to find gcc", Composite.get()); 699 700 // Generate an assembly language file for the bitcode. 701 std::string ErrMsg; 702 if (GenerateCFile(CFile.str(), BitcodeOutputFilename, llc, ErrMsg)) 703 PrintAndExit(ErrMsg, Composite.get()); 704 705 if (GenerateNative(OutputFilename, CFile.str(), 706 NativeLinkItems, gcc, envp, ErrMsg)) 707 PrintAndExit(ErrMsg, Composite.get()); 708 } else { 709 EmitShellScript(argv, Composite.get()); 710 } 711 712 // Make the script executable... 713 std::string ErrMsg; 714 if (sys::Path(OutputFilename).makeExecutableOnDisk(&ErrMsg)) 715 PrintAndExit(ErrMsg, Composite.get()); 716 717 // Make the bitcode file readable and directly executable in LLEE as well 718 if (sys::Path(BitcodeOutputFilename).makeExecutableOnDisk(&ErrMsg)) 719 PrintAndExit(ErrMsg, Composite.get()); 720 721 if (sys::Path(BitcodeOutputFilename).makeReadableOnDisk(&ErrMsg)) 722 PrintAndExit(ErrMsg, Composite.get()); 723 } 724 725 // Operations which may fail are now complete. 726 BitcodeOutputRemover.releaseFile(); 727 if (!LinkAsLibrary) 728 OutputRemover.releaseFile(); 729 730 // Graceful exit 731 return 0; 732 } 733