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 "llvm/Config/config.h" 41 #include <memory> 42 #include <cstring> 43 using namespace llvm; 44 45 // Rightly this should go in a header file but it just seems such a waste. 46 namespace llvm { 47 extern void Optimize(Module*); 48 } 49 50 // Input/Output Options 51 static cl::list<std::string> InputFilenames(cl::Positional, cl::OneOrMore, 52 cl::desc("<input bitcode files>")); 53 54 static cl::opt<std::string> OutputFilename("o", cl::init("a.out"), 55 cl::desc("Override output filename"), 56 cl::value_desc("filename")); 57 58 static cl::opt<std::string> BitcodeOutputFilename("b", cl::init(""), 59 cl::desc("Override bitcode output filename"), 60 cl::value_desc("filename")); 61 62 static cl::opt<bool> Verbose("v", 63 cl::desc("Print information about actions taken")); 64 65 static cl::list<std::string> LibPaths("L", cl::Prefix, 66 cl::desc("Specify a library search path"), 67 cl::value_desc("directory")); 68 69 static cl::list<std::string> FrameworkPaths("F", cl::Prefix, 70 cl::desc("Specify a framework search path"), 71 cl::value_desc("directory")); 72 73 static cl::list<std::string> Libraries("l", cl::Prefix, 74 cl::desc("Specify libraries to link to"), 75 cl::value_desc("library prefix")); 76 77 static cl::list<std::string> Frameworks("framework", 78 cl::desc("Specify frameworks to link to"), 79 cl::value_desc("framework")); 80 81 // Options to control the linking, optimization, and code gen processes 82 static cl::opt<bool> LinkAsLibrary("link-as-library", 83 cl::desc("Link the .bc files together as a library, not an executable")); 84 85 static cl::alias Relink("r", cl::aliasopt(LinkAsLibrary), 86 cl::desc("Alias for -link-as-library")); 87 88 static cl::opt<bool> Native("native", 89 cl::desc("Generate a native binary instead of a shell script")); 90 91 static cl::opt<bool>NativeCBE("native-cbe", 92 cl::desc("Generate a native binary with the C backend and GCC")); 93 94 static cl::list<std::string> PostLinkOpts("post-link-opts", 95 cl::value_desc("path"), 96 cl::desc("Run one or more optimization programs after linking")); 97 98 static cl::list<std::string> XLinker("Xlinker", cl::value_desc("option"), 99 cl::desc("Pass options to the system linker")); 100 101 // Compatibility options that llvm-ld ignores but are supported for 102 // compatibility with LD 103 static cl::opt<std::string> CO3("soname", cl::Hidden, 104 cl::desc("Compatibility option: ignored")); 105 106 static cl::opt<std::string> CO4("version-script", cl::Hidden, 107 cl::desc("Compatibility option: ignored")); 108 109 static cl::opt<bool> CO5("eh-frame-hdr", cl::Hidden, 110 cl::desc("Compatibility option: ignored")); 111 112 static cl::opt<std::string> CO6("h", cl::Hidden, 113 cl::desc("Compatibility option: ignored")); 114 115 static cl::opt<bool> CO7("start-group", cl::Hidden, 116 cl::desc("Compatibility option: ignored")); 117 118 static cl::opt<bool> CO8("end-group", cl::Hidden, 119 cl::desc("Compatibility option: ignored")); 120 121 static cl::opt<std::string> CO9("m", cl::Hidden, 122 cl::desc("Compatibility option: ignored")); 123 124 /// This is just for convenience so it doesn't have to be passed around 125 /// everywhere. 126 static std::string progname; 127 128 /// FileRemover objects to clean up output files in the event of an error. 129 static FileRemover OutputRemover; 130 static FileRemover BitcodeOutputRemover; 131 132 /// PrintAndExit - Prints a message to standard error and exits with error code 133 /// 134 /// Inputs: 135 /// Message - The message to print to standard error. 136 /// 137 static void PrintAndExit(const std::string &Message, Module *M, int errcode = 1) { 138 errs() << progname << ": " << Message << "\n"; 139 delete M; 140 llvm_shutdown(); 141 exit(errcode); 142 } 143 144 static void PrintCommand(const std::vector<const char*> &args) { 145 std::vector<const char*>::const_iterator I = args.begin(), E = args.end(); 146 for (; I != E; ++I) 147 if (*I) 148 errs() << "'" << *I << "'" << " "; 149 errs() << "\n"; 150 } 151 152 /// CopyEnv - This function takes an array of environment variables and makes a 153 /// copy of it. This copy can then be manipulated any way the caller likes 154 /// without affecting the process's real environment. 155 /// 156 /// Inputs: 157 /// envp - An array of C strings containing an environment. 158 /// 159 /// Return value: 160 /// NULL - An error occurred. 161 /// 162 /// Otherwise, a pointer to a new array of C strings is returned. Every string 163 /// in the array is a duplicate of the one in the original array (i.e. we do 164 /// not copy the char *'s from one array to another). 165 /// 166 static char ** CopyEnv(char ** const envp) { 167 // Count the number of entries in the old list; 168 unsigned entries; // The number of entries in the old environment list 169 for (entries = 0; envp[entries] != NULL; entries++) 170 /*empty*/; 171 172 // Add one more entry for the NULL pointer that ends the list. 173 ++entries; 174 175 // If there are no entries at all, just return NULL. 176 if (entries == 0) 177 return NULL; 178 179 // Allocate a new environment list. 180 char **newenv = new char* [entries]; 181 if (newenv == NULL) 182 return NULL; 183 184 // Make a copy of the list. Don't forget the NULL that ends the list. 185 entries = 0; 186 while (envp[entries] != NULL) { 187 size_t len = strlen(envp[entries]) + 1; 188 newenv[entries] = new char[len]; 189 memcpy(newenv[entries], envp[entries], len); 190 ++entries; 191 } 192 newenv[entries] = NULL; 193 194 return newenv; 195 } 196 197 198 /// RemoveEnv - Remove the specified environment variable from the environment 199 /// array. 200 /// 201 /// Inputs: 202 /// name - The name of the variable to remove. It cannot be NULL. 203 /// envp - The array of environment variables. It cannot be NULL. 204 /// 205 /// Notes: 206 /// This is mainly done because functions to remove items from the environment 207 /// are not available across all platforms. In particular, Solaris does not 208 /// seem to have an unsetenv() function or a setenv() function (or they are 209 /// undocumented if they do exist). 210 /// 211 static void RemoveEnv(const char * name, char ** const envp) { 212 for (unsigned index=0; envp[index] != NULL; index++) { 213 // Find the first equals sign in the array and make it an EOS character. 214 char *p = strchr (envp[index], '='); 215 if (p == NULL) 216 continue; 217 else 218 *p = '\0'; 219 220 // Compare the two strings. If they are equal, zap this string. 221 // Otherwise, restore it. 222 if (!strcmp(name, envp[index])) 223 *envp[index] = '\0'; 224 else 225 *p = '='; 226 } 227 228 return; 229 } 230 231 /// GenerateBitcode - generates a bitcode file from the module provided 232 void GenerateBitcode(Module* M, const std::string& FileName) { 233 234 if (Verbose) 235 errs() << "Generating Bitcode To " << FileName << '\n'; 236 237 // Create the output file. 238 std::string ErrorInfo; 239 tool_output_file Out(FileName.c_str(), ErrorInfo, 240 raw_fd_ostream::F_Binary); 241 if (!ErrorInfo.empty()) { 242 PrintAndExit(ErrorInfo, M); 243 return; 244 } 245 246 // Write it out 247 WriteBitcodeToFile(M, Out.os()); 248 Out.keep(); 249 } 250 251 /// GenerateAssembly - generates a native assembly language source file from the 252 /// specified bitcode file. 253 /// 254 /// Inputs: 255 /// InputFilename - The name of the input bitcode file. 256 /// OutputFilename - The name of the file to generate. 257 /// llc - The pathname to use for LLC. 258 /// envp - The environment to use when running LLC. 259 /// 260 /// Return non-zero value on error. 261 /// 262 static int GenerateAssembly(const std::string &OutputFilename, 263 const std::string &InputFilename, 264 const sys::Path &llc, 265 std::string &ErrMsg ) { 266 // Run LLC to convert the bitcode file into assembly code. 267 std::vector<const char*> args; 268 args.push_back(llc.c_str()); 269 // We will use GCC to assemble the program so set the assembly syntax to AT&T, 270 // regardless of what the target in the bitcode file is. 271 args.push_back("-x86-asm-syntax=att"); 272 args.push_back("-o"); 273 args.push_back(OutputFilename.c_str()); 274 args.push_back(InputFilename.c_str()); 275 args.push_back(0); 276 277 if (Verbose) { 278 errs() << "Generating Assembly With: \n"; 279 PrintCommand(args); 280 } 281 282 return sys::Program::ExecuteAndWait(llc, &args[0], 0, 0, 0, 0, &ErrMsg); 283 } 284 285 /// GenerateCFile - generates a C source file from the specified bitcode file. 286 static int GenerateCFile(const std::string &OutputFile, 287 const std::string &InputFile, 288 const sys::Path &llc, 289 std::string& ErrMsg) { 290 // Run LLC to convert the bitcode file into C. 291 std::vector<const char*> args; 292 args.push_back(llc.c_str()); 293 args.push_back("-march=c"); 294 args.push_back("-o"); 295 args.push_back(OutputFile.c_str()); 296 args.push_back(InputFile.c_str()); 297 args.push_back(0); 298 299 if (Verbose) { 300 errs() << "Generating C Source With: \n"; 301 PrintCommand(args); 302 } 303 304 return sys::Program::ExecuteAndWait(llc, &args[0], 0, 0, 0, 0, &ErrMsg); 305 } 306 307 /// GenerateNative - generates a native object file from the 308 /// specified bitcode file. 309 /// 310 /// Inputs: 311 /// InputFilename - The name of the input bitcode file. 312 /// OutputFilename - The name of the file to generate. 313 /// NativeLinkItems - The native libraries, files, code with which to link 314 /// LibPaths - The list of directories in which to find libraries. 315 /// FrameworksPaths - The list of directories in which to find frameworks. 316 /// Frameworks - The list of frameworks (dynamic libraries) 317 /// gcc - The pathname to use for GGC. 318 /// envp - A copy of the process's current environment. 319 /// 320 /// Outputs: 321 /// None. 322 /// 323 /// Returns non-zero value on error. 324 /// 325 static int GenerateNative(const std::string &OutputFilename, 326 const std::string &InputFilename, 327 const Linker::ItemList &LinkItems, 328 const sys::Path &gcc, char ** const envp, 329 std::string& ErrMsg) { 330 // Remove these environment variables from the environment of the 331 // programs that we will execute. It appears that GCC sets these 332 // environment variables so that the programs it uses can configure 333 // themselves identically. 334 // 335 // However, when we invoke GCC below, we want it to use its normal 336 // configuration. Hence, we must sanitize its environment. 337 char ** clean_env = CopyEnv(envp); 338 if (clean_env == NULL) 339 return 1; 340 RemoveEnv("LIBRARY_PATH", clean_env); 341 RemoveEnv("COLLECT_GCC_OPTIONS", clean_env); 342 RemoveEnv("GCC_EXEC_PREFIX", clean_env); 343 RemoveEnv("COMPILER_PATH", clean_env); 344 RemoveEnv("COLLECT_GCC", clean_env); 345 346 347 // Run GCC to assemble and link the program into native code. 348 // 349 // Note: 350 // We can't just assemble and link the file with the system assembler 351 // and linker because we don't know where to put the _start symbol. 352 // GCC mysteriously knows how to do it. 353 std::vector<std::string> args; 354 args.push_back(gcc.c_str()); 355 args.push_back("-fno-strict-aliasing"); 356 args.push_back("-O3"); 357 args.push_back("-o"); 358 args.push_back(OutputFilename); 359 args.push_back(InputFilename); 360 361 // Add in the library and framework paths 362 for (unsigned index = 0; index < LibPaths.size(); index++) { 363 args.push_back("-L" + LibPaths[index]); 364 } 365 for (unsigned index = 0; index < FrameworkPaths.size(); index++) { 366 args.push_back("-F" + FrameworkPaths[index]); 367 } 368 369 // Add the requested options 370 for (unsigned index = 0; index < XLinker.size(); index++) 371 args.push_back(XLinker[index]); 372 373 // Add in the libraries to link. 374 for (unsigned index = 0; index < LinkItems.size(); index++) 375 if (LinkItems[index].first != "crtend") { 376 if (LinkItems[index].second) 377 args.push_back("-l" + LinkItems[index].first); 378 else 379 args.push_back(LinkItems[index].first); 380 } 381 382 // Add in frameworks to link. 383 for (unsigned index = 0; index < Frameworks.size(); index++) { 384 args.push_back("-framework"); 385 args.push_back(Frameworks[index]); 386 } 387 388 // Now that "args" owns all the std::strings for the arguments, call the c_str 389 // method to get the underlying string array. We do this game so that the 390 // std::string array is guaranteed to outlive the const char* array. 391 std::vector<const char *> Args; 392 for (unsigned i = 0, e = args.size(); i != e; ++i) 393 Args.push_back(args[i].c_str()); 394 Args.push_back(0); 395 396 if (Verbose) { 397 errs() << "Generating Native Executable With:\n"; 398 PrintCommand(Args); 399 } 400 401 // Run the compiler to assembly and link together the program. 402 int R = sys::Program::ExecuteAndWait( 403 gcc, &Args[0], const_cast<const char **>(clean_env), 0, 0, 0, &ErrMsg); 404 delete [] clean_env; 405 return R; 406 } 407 408 /// EmitShellScript - Output the wrapper file that invokes the JIT on the LLVM 409 /// bitcode file for the program. 410 static void EmitShellScript(char **argv, Module *M) { 411 if (Verbose) 412 errs() << "Emitting Shell Script\n"; 413 #if defined(_WIN32) 414 // Windows doesn't support #!/bin/sh style shell scripts in .exe files. To 415 // support windows systems, we copy the llvm-stub.exe executable from the 416 // build tree to the destination file. 417 std::string ErrMsg; 418 sys::Path llvmstub = PrependMainExecutablePath("llvm-stub", argv[0], 419 (void *)(intptr_t)&Optimize); 420 if (llvmstub.isEmpty()) 421 PrintAndExit("Could not find llvm-stub.exe executable!", M); 422 423 if (0 != sys::CopyFile(sys::Path(OutputFilename), llvmstub, &ErrMsg)) 424 PrintAndExit(ErrMsg, M); 425 426 return; 427 #endif 428 429 // Output the script to start the program... 430 std::string ErrorInfo; 431 tool_output_file Out2(OutputFilename.c_str(), ErrorInfo); 432 if (!ErrorInfo.empty()) 433 PrintAndExit(ErrorInfo, M); 434 435 Out2.os() << "#!/bin/sh\n"; 436 // Allow user to setenv LLVMINTERP if lli is not in their PATH. 437 Out2.os() << "lli=${LLVMINTERP-lli}\n"; 438 Out2.os() << "exec $lli \\\n"; 439 // gcc accepts -l<lib> and implicitly searches /lib and /usr/lib. 440 LibPaths.push_back("/lib"); 441 LibPaths.push_back("/usr/lib"); 442 LibPaths.push_back("/usr/X11R6/lib"); 443 // We don't need to link in libc! In fact, /usr/lib/libc.so may not be a 444 // shared object at all! See RH 8: plain text. 445 std::vector<std::string>::iterator libc = 446 std::find(Libraries.begin(), Libraries.end(), "c"); 447 if (libc != Libraries.end()) Libraries.erase(libc); 448 // List all the shared object (native) libraries this executable will need 449 // on the command line, so that we don't have to do this manually! 450 for (std::vector<std::string>::iterator i = Libraries.begin(), 451 e = Libraries.end(); i != e; ++i) { 452 // try explicit -L arguments first: 453 sys::Path FullLibraryPath; 454 for (cl::list<std::string>::const_iterator P = LibPaths.begin(), 455 E = LibPaths.end(); P != E; ++P) { 456 FullLibraryPath = *P; 457 FullLibraryPath.appendComponent("lib" + *i); 458 FullLibraryPath.appendSuffix(sys::Path::GetDLLSuffix()); 459 if (!FullLibraryPath.isEmpty()) { 460 if (!FullLibraryPath.isDynamicLibrary()) { 461 // Not a native shared library; mark as invalid 462 FullLibraryPath = sys::Path(); 463 } else break; 464 } 465 } 466 if (FullLibraryPath.isEmpty()) 467 FullLibraryPath = sys::Path::FindLibrary(*i); 468 if (!FullLibraryPath.isEmpty()) 469 Out2.os() << " -load=" << FullLibraryPath.str() << " \\\n"; 470 } 471 Out2.os() << " " << BitcodeOutputFilename << " ${1+\"$@\"}\n"; 472 Out2.keep(); 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