1 //===- gccld.cpp - LLVM 'ld' compatible linker ----------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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 bytecode file actually lives in
15 // the a.out.bc file generated by this program. Also, Force is on by default.
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.
21 //===----------------------------------------------------------------------===//
24 #include "llvm/Linker.h"
25 #include "llvm/Module.h"
26 #include "llvm/PassManager.h"
27 #include "llvm/Bytecode/Reader.h"
28 #include "llvm/Target/TargetData.h"
29 #include "llvm/Transforms/IPO.h"
30 #include "llvm/Transforms/Scalar.h"
31 #include "llvm/Support/CommandLine.h"
32 #include "llvm/Support/ManagedStatic.h"
33 #include "llvm/Support/FileUtilities.h"
34 #include "llvm/Support/ManagedStatic.h"
35 #include "llvm/Support/Streams.h"
36 #include "llvm/System/Signals.h"
37 #include "llvm/Support/SystemUtils.h"
44 InputFilenames(cl::Positional, cl::desc("<input bytecode files>"),
48 OutputFilename("o", cl::desc("Override output filename"), cl::init("a.out"),
49 cl::value_desc("filename"));
52 Verbose("v", cl::desc("Print information about actions taken"));
55 LibPaths("L", cl::desc("Specify a library search path"), cl::Prefix,
56 cl::value_desc("directory"));
59 Libraries("l", cl::desc("Specify libraries to link to"), cl::Prefix,
60 cl::value_desc("library prefix"));
63 Strip("strip-all", cl::desc("Strip all symbol info from executable"));
65 StripDebug("strip-debug",
66 cl::desc("Strip debugger symbol info from executable"));
69 NoInternalize("disable-internalize",
70 cl::desc("Do not mark all symbols as internal"));
72 ExportDynamic("export-dynamic", cl::desc("Alias for -disable-internalize"),
73 cl::aliasopt(NoInternalize));
76 LinkAsLibrary("link-as-library", cl::desc("Link the .bc files together as a"
77 " library, not an executable"));
79 Relink("r", cl::desc("Alias for -link-as-library"),
80 cl::aliasopt(LinkAsLibrary));
83 Native("native", cl::ZeroOrMore,
84 cl::desc("Generate a native binary instead of a shell script"));
86 NativeCBE("native-cbe", cl::ZeroOrMore,
87 cl::desc("Generate a native binary with the C backend and GCC"));
90 SaveTemps("save-temps",
91 cl::desc("Do not delete temporary files"));
95 cl::desc("Set runtime shared library search path (requires -native or"
97 cl::Prefix, cl::value_desc("directory"));
101 cl::desc("Set internal name of shared library (requires -native or"
103 cl::Prefix, cl::value_desc("name"));
105 // Compatibility options that are ignored but supported by LD
107 CO4("version-script", cl::Hidden, cl::desc("Compatibility option: ignored"));
109 CO5("eh-frame-hdr", cl::Hidden, cl::desc("Compatibility option: ignored"));
111 CO6("h", cl::Hidden, cl::desc("Compatibility option: ignored"));
113 CO7("start-group", cl::Hidden, cl::desc("Compatibility option: ignored"));
115 CO8("end-group", cl::Hidden, cl::desc("Compatibility option: ignored"));
117 cl::alias A0("s", cl::desc("Alias for --strip-all"),
118 cl::aliasopt(Strip));
119 cl::alias A1("S", cl::desc("Alias for --strip-debug"),
120 cl::aliasopt(StripDebug));
124 /// PrintAndReturn - Prints a message to standard error and returns true.
127 /// progname - The name of the program (i.e. argv[0]).
128 /// Message - The message to print to standard error.
130 static int PrintAndReturn(const char *progname, const std::string &Message) {
131 cerr << progname << ": " << Message << "\n";
135 /// EmitShellScript - Output the wrapper file that invokes the JIT on the LLVM
136 /// bytecode file for the program.
137 static void EmitShellScript(char **argv) {
138 #if defined(_WIN32) || defined(__CYGWIN__)
139 // Windows doesn't support #!/bin/sh style shell scripts in .exe files. To
140 // support windows systems, we copy the llvm-stub.exe executable from the
141 // build tree to the destination file.
143 sys::Path llvmstub = FindExecutable("llvm-stub.exe", argv[0]);
144 if (llvmstub.isEmpty()) {
145 cerr << "Could not find llvm-stub.exe executable!\n";
148 if (0 != sys::CopyFile(sys::Path(OutputFilename), llvmstub, &ErrMsg)) {
149 cerr << argv[0] << ": " << ErrMsg << "\n";
156 // Output the script to start the program...
157 std::ofstream Out2(OutputFilename.c_str());
159 exit(PrintAndReturn(argv[0], "error opening '" + OutputFilename +
162 Out2 << "#!/bin/sh\n";
163 // Allow user to setenv LLVMINTERP if lli is not in their PATH.
164 Out2 << "lli=${LLVMINTERP-lli}\n";
165 Out2 << "exec $lli \\\n";
167 // We don't need to link in libc! In fact, /usr/lib/libc.so may not be a
168 // shared object at all! See RH 8: plain text.
169 std::vector<std::string>::iterator libc =
170 std::find(Libraries.begin(), Libraries.end(), "c");
171 if (libc != Libraries.end()) Libraries.erase(libc);
172 // List all the shared object (native) libraries this executable will need
173 // on the command line, so that we don't have to do this manually!
174 for (std::vector<std::string>::iterator i = Libraries.begin(),
175 e = Libraries.end(); i != e; ++i) {
176 sys::Path FullLibraryPath = sys::Path::FindLibrary(*i);
177 if (!FullLibraryPath.isEmpty() && FullLibraryPath.isDynamicLibrary())
178 Out2 << " -load=" << FullLibraryPath.toString() << " \\\n";
180 Out2 << " $0.bc ${1+\"$@\"}\n";
184 // BuildLinkItems -- This function generates a LinkItemList for the LinkItems
185 // linker function by combining the Files and Libraries in the order they were
186 // declared on the command line.
187 static void BuildLinkItems(
188 Linker::ItemList& Items,
189 const cl::list<std::string>& Files,
190 const cl::list<std::string>& Libraries) {
192 // Build the list of linkage items for LinkItems.
194 cl::list<std::string>::const_iterator fileIt = Files.begin();
195 cl::list<std::string>::const_iterator libIt = Libraries.begin();
197 int libPos = -1, filePos = -1;
198 while ( libIt != Libraries.end() || fileIt != Files.end() ) {
199 if (libIt != Libraries.end())
200 libPos = Libraries.getPosition(libIt - Libraries.begin());
203 if (fileIt != Files.end())
204 filePos = Files.getPosition(fileIt - Files.begin());
208 if (filePos != -1 && (libPos == -1 || filePos < libPos)) {
210 Items.push_back(std::make_pair(*fileIt++, false));
211 } else if (libPos != -1 && (filePos == -1 || libPos < filePos)) {
213 Items.push_back(std::make_pair(*libIt++, true));
218 int main(int argc, char **argv, char **envp ) {
219 llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
220 cl::ParseCommandLineOptions(argc, argv, " llvm linker for GCC\n");
221 sys::PrintStackTraceOnErrorSignal();
225 std::string ProgName = sys::Path(argv[0]).getBasename();
226 Linker TheLinker(ProgName, OutputFilename, Verbose);
229 // Remove any consecutive duplicates of the same library...
230 Libraries.erase(std::unique(Libraries.begin(), Libraries.end()),
233 TheLinker.addPaths(LibPaths);
234 TheLinker.addSystemPaths();
237 std::vector<sys::Path> Files;
238 for (unsigned i = 0; i < InputFilenames.size(); ++i )
239 Files.push_back(sys::Path(InputFilenames[i]));
241 if (TheLinker.LinkInFiles(Files))
242 return 1; // Error already printed by linker
244 // The libraries aren't linked in but are noted as "dependent" in the
246 for (cl::list<std::string>::const_iterator I = Libraries.begin(),
247 E = Libraries.end(); I != E ; ++I) {
248 TheLinker.getModule()->addLibrary(*I);
252 // Build a list of the items from our command line
253 Linker::ItemList Items;
254 Linker::ItemList NativeItems;
255 BuildLinkItems(Items, InputFilenames, Libraries);
257 // Link all the items together
258 if (TheLinker.LinkInItems(Items,NativeItems))
259 return 1; // Error already printed
261 // Revise the Libraries based on the remaining (native) libraries that
262 // were not linked in to the bytecode. This ensures that we don't attempt
263 // to pass a bytecode library to the native linker
264 Libraries.clear(); // we've consumed the libraries except for native
265 if ((Native || NativeCBE) && !NativeItems.empty()) {
266 for (Linker::ItemList::const_iterator I = NativeItems.begin(),
267 E = NativeItems.end(); I != E; ++I) {
268 Libraries.push_back(I->first);
273 // We're done with the Linker, so tell it to release its module
274 std::auto_ptr<Module> Composite(TheLinker.releaseModule());
276 // Create the output file.
277 std::string RealBytecodeOutput = OutputFilename;
278 if (!LinkAsLibrary || Native || NativeCBE) RealBytecodeOutput += ".bc";
279 std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
281 std::ofstream Out(RealBytecodeOutput.c_str(), io_mode);
283 return PrintAndReturn(argv[0], "error opening '" + RealBytecodeOutput +
286 // Ensure that the bytecode file gets removed from the disk if we get a
288 sys::RemoveFileOnSignal(sys::Path(RealBytecodeOutput));
290 // Strip everything if Strip is set, otherwise if stripdebug is set, just
292 int StripLevel = Strip ? 2 : (StripDebug ? 1 : 0);
294 // Internalize the module if neither -disable-internalize nor
295 // -link-as-library are passed in.
296 bool ShouldInternalize = !NoInternalize & !LinkAsLibrary;
298 // Generate the bytecode file.
299 if (GenerateBytecode(Composite.get(), StripLevel, ShouldInternalize, &Out)){
301 return PrintAndReturn(argv[0], "error generating bytecode");
304 // Close the bytecode file.
307 // Generate either a native file or a JIT shell script. If the user wants
308 // to generate a native file, compile it from the bytecode file. Otherwise,
309 // if the target is not a library, create a script that will run the
310 // bytecode through the JIT.
312 // Name of the Assembly Language output file
313 sys::Path AssemblyFile (OutputFilename);
314 AssemblyFile.appendSuffix("s");
316 // Mark the output files for removal if we get an interrupt.
317 sys::RemoveFileOnSignal(AssemblyFile);
318 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
320 // Determine the locations of the llc and gcc programs.
321 sys::Path llc = FindExecutable("llc", argv[0]);
323 return PrintAndReturn(argv[0], "Failed to find llc");
325 sys::Path gcc = FindExecutable("gcc", argv[0]);
327 return PrintAndReturn(argv[0], "Failed to find gcc");
329 // Generate an assembly language file for the bytecode.
330 if (Verbose) cout << "Generating Assembly Code\n";
332 if (0 != GenerateAssembly(
333 AssemblyFile.toString(), RealBytecodeOutput, llc, ErrMsg, Verbose)) {
334 cerr << argv[0] << ": " << ErrMsg << "\n";
337 if (Verbose) cout << "Generating Native Code\n";
338 if (0 != GenerateNative(OutputFilename, AssemblyFile.toString(),
339 LibPaths, Libraries, gcc, envp, LinkAsLibrary,
340 NoInternalize, RPath, SOName, ErrMsg, Verbose) ) {
341 cerr << argv[0] << ": " << ErrMsg << "\n";
346 // Remove the assembly language file.
347 AssemblyFile.eraseFromDisk();
348 // Remove the bytecode language file.
349 sys::Path(RealBytecodeOutput).eraseFromDisk();
352 } else if (NativeCBE) {
353 sys::Path CFile (OutputFilename);
354 CFile.appendSuffix("cbe.c");
356 // Mark the output files for removal if we get an interrupt.
357 sys::RemoveFileOnSignal(CFile);
358 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
360 // Determine the locations of the llc and gcc programs.
361 sys::Path llc = FindExecutable("llc", argv[0]);
363 return PrintAndReturn(argv[0], "Failed to find llc");
365 sys::Path gcc = FindExecutable("gcc", argv[0]);
367 return PrintAndReturn(argv[0], "Failed to find gcc");
369 // Generate an assembly language file for the bytecode.
370 if (Verbose) cout << "Generating C Source Code\n";
372 if (0 != GenerateCFile(
373 CFile.toString(), RealBytecodeOutput, llc, ErrMsg, Verbose)) {
374 cerr << argv[0] << ": " << ErrMsg << "\n";
377 if (Verbose) cout << "Generating Native Code\n";
378 if (0 != GenerateNative(OutputFilename, CFile.toString(),
379 LibPaths, Libraries, gcc, envp, LinkAsLibrary,
380 NoInternalize, RPath, SOName, ErrMsg, Verbose)) {
381 cerr << argv[0] << ": " << ErrMsg << "\n";
386 // Remove the assembly language file.
387 CFile.eraseFromDisk();
388 // Remove the bytecode language file.
389 sys::Path(RealBytecodeOutput).eraseFromDisk();
392 } else if (!LinkAsLibrary) {
393 EmitShellScript(argv);
395 // Make the bytecode file readable and directly executable in LLEE
397 if (sys::Path(RealBytecodeOutput).makeExecutableOnDisk(&ErrMsg)) {
398 cerr << argv[0] << ": " << ErrMsg << "\n";
401 if (sys::Path(RealBytecodeOutput).makeReadableOnDisk(&ErrMsg)) {
402 cerr << argv[0] << ": " << ErrMsg << "\n";
407 // Make the output, whether native or script, executable as well...
409 if (sys::Path(OutputFilename).makeExecutableOnDisk(&ErrMsg)) {
410 cerr << argv[0] << ": " << ErrMsg << "\n";
413 } catch (const char*msg) {
414 cerr << argv[0] << ": " << msg << "\n";
416 } catch (const std::string& msg) {
417 cerr << argv[0] << ": " << msg << "\n";
420 // This really shouldn't happen, but just in case ....
421 cerr << argv[0] << ": An unexpected unknown exception occurred.\n";