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/Bytecode/WriteBytecodePass.h"
29 #include "llvm/Target/TargetData.h"
30 #include "llvm/Transforms/IPO.h"
31 #include "llvm/Transforms/Scalar.h"
32 #include "llvm/Support/CommandLine.h"
33 #include "llvm/Support/FileUtilities.h"
34 #include "llvm/System/Signals.h"
35 #include "llvm/Support/SystemUtils.h"
42 InputFilenames(cl::Positional, cl::desc("<input bytecode files>"),
46 OutputFilename("o", cl::desc("Override output filename"), cl::init("a.out"),
47 cl::value_desc("filename"));
50 Verbose("v", cl::desc("Print information about actions taken"));
53 LibPaths("L", cl::desc("Specify a library search path"), cl::Prefix,
54 cl::value_desc("directory"));
57 Libraries("l", cl::desc("Specify libraries to link to"), cl::Prefix,
58 cl::value_desc("library prefix"));
61 Strip("strip-all", cl::desc("Strip all symbol info from executable"));
63 StripDebug("strip-debug",
64 cl::desc("Strip debugger symbol info from executable"));
67 NoInternalize("disable-internalize",
68 cl::desc("Do not mark all symbols as internal"));
70 ExportDynamic("export-dynamic", cl::desc("Alias for -disable-internalize"),
71 cl::aliasopt(NoInternalize));
74 LinkAsLibrary("link-as-library", cl::desc("Link the .bc files together as a"
75 " library, not an executable"));
77 Relink("r", cl::desc("Alias for -link-as-library"),
78 cl::aliasopt(LinkAsLibrary));
82 cl::desc("Generate a native binary instead of a shell script"));
84 NativeCBE("native-cbe",
85 cl::desc("Generate a native binary with the C backend and GCC"));
88 SaveTemps("save-temps",
89 cl::desc("Do not delete temporary files"));
93 cl::desc("Set runtime shared library search path (requires -native or"
95 cl::Prefix, cl::value_desc("directory"));
99 cl::desc("Set internal name of shared library (requires -native or"
101 cl::Prefix, cl::value_desc("name"));
103 // Compatibility options that are ignored but supported by LD
105 CO4("version-script", cl::Hidden, cl::desc("Compatibility option: ignored"));
107 CO5("eh-frame-hdr", cl::Hidden, cl::desc("Compatibility option: ignored"));
109 CO6("h", cl::Hidden, cl::desc("Compatibility option: ignored"));
111 cl::alias A0("s", cl::desc("Alias for --strip-all"),
112 cl::aliasopt(Strip));
113 cl::alias A1("S", cl::desc("Alias for --strip-debug"),
114 cl::aliasopt(StripDebug));
118 /// PrintAndReturn - Prints a message to standard error and returns true.
121 /// progname - The name of the program (i.e. argv[0]).
122 /// Message - The message to print to standard error.
124 static int PrintAndReturn(const char *progname, const std::string &Message) {
125 std::cerr << progname << ": " << Message << "\n";
129 /// EmitShellScript - Output the wrapper file that invokes the JIT on the LLVM
130 /// bytecode file for the program.
131 static void EmitShellScript(char **argv) {
132 #if defined(_WIN32) || defined(__CYGWIN__)
133 // Windows doesn't support #!/bin/sh style shell scripts in .exe files. To
134 // support windows systems, we copy the llvm-stub.exe executable from the
135 // build tree to the destination file.
136 std::string llvmstub = FindExecutable("llvm-stub.exe", argv[0]).toString();
137 if (llvmstub.empty()) {
138 std::cerr << "Could not find llvm-stub.exe executable!\n";
141 sys::CopyFile(sys::Path(OutputFilename), sys::Path(llvmstub));
145 // Output the script to start the program...
146 std::ofstream Out2(OutputFilename.c_str());
148 exit(PrintAndReturn(argv[0], "error opening '" + OutputFilename +
151 Out2 << "#!/bin/sh\n";
152 // Allow user to setenv LLVMINTERP if lli is not in their PATH.
153 Out2 << "lli=${LLVMINTERP-lli}\n";
154 Out2 << "exec $lli \\\n";
156 // We don't need to link in libc! In fact, /usr/lib/libc.so may not be a
157 // shared object at all! See RH 8: plain text.
158 std::vector<std::string>::iterator libc =
159 std::find(Libraries.begin(), Libraries.end(), "c");
160 if (libc != Libraries.end()) Libraries.erase(libc);
161 // List all the shared object (native) libraries this executable will need
162 // on the command line, so that we don't have to do this manually!
163 for (std::vector<std::string>::iterator i = Libraries.begin(),
164 e = Libraries.end(); i != e; ++i) {
165 sys::Path FullLibraryPath = sys::Path::FindLibrary(*i);
166 if (!FullLibraryPath.isEmpty() && FullLibraryPath.isDynamicLibrary())
167 Out2 << " -load=" << FullLibraryPath.toString() << " \\\n";
169 Out2 << " $0.bc ${1+\"$@\"}\n";
173 // BuildLinkItems -- This function generates a LinkItemList for the LinkItems
174 // linker function by combining the Files and Libraries in the order they were
175 // declared on the command line.
176 static void BuildLinkItems(
177 Linker::ItemList& Items,
178 const cl::list<std::string>& Files,
179 const cl::list<std::string>& Libraries) {
181 // Build the list of linkage items for LinkItems.
183 cl::list<std::string>::const_iterator fileIt = Files.begin();
184 cl::list<std::string>::const_iterator libIt = Libraries.begin();
186 int libPos = -1, filePos = -1;
187 while ( libIt != Libraries.end() || fileIt != Files.end() ) {
188 if (libIt != Libraries.end())
189 libPos = Libraries.getPosition(libIt - Libraries.begin());
192 if (fileIt != Files.end())
193 filePos = Files.getPosition(fileIt - Files.begin());
197 if (filePos != -1 && (libPos == -1 || filePos < libPos)) {
199 Items.push_back(std::make_pair(*fileIt++, false));
200 } else if (libPos != -1 && (filePos == -1 || libPos < filePos)) {
202 Items.push_back(std::make_pair(*libIt++, true));
207 int main(int argc, char **argv, char **envp ) {
208 cl::ParseCommandLineOptions(argc, argv, " llvm linker for GCC\n");
209 sys::PrintStackTraceOnErrorSignal();
213 std::string ProgName = sys::Path(argv[0]).getBasename();
214 Linker TheLinker(ProgName, Verbose);
217 // Remove any consecutive duplicates of the same library...
218 Libraries.erase(std::unique(Libraries.begin(), Libraries.end()),
221 TheLinker.addPaths(LibPaths);
222 TheLinker.addSystemPaths();
225 std::vector<sys::Path> Files;
226 for (unsigned i = 0; i < InputFilenames.size(); ++i )
227 Files.push_back(sys::Path(InputFilenames[i]));
229 if (TheLinker.LinkInFiles(Files))
230 return 1; // Error already printed by linker
232 // The libraries aren't linked in but are noted as "dependent" in the
234 for (cl::list<std::string>::const_iterator I = Libraries.begin(),
235 E = Libraries.end(); I != E ; ++I) {
236 TheLinker.getModule()->addLibrary(*I);
240 // Build a list of the items from our command line
241 Linker::ItemList Items;
242 BuildLinkItems(Items, InputFilenames, Libraries);
244 // Link all the items together
245 if (TheLinker.LinkInItems(Items))
246 return 1; // Error already printed
249 // We're done with the Linker, so tell it to release its module
250 std::auto_ptr<Module> Composite(TheLinker.releaseModule());
252 // Create the output file.
253 std::string RealBytecodeOutput = OutputFilename;
254 if (!LinkAsLibrary || Native || NativeCBE) RealBytecodeOutput += ".bc";
255 std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
257 std::ofstream Out(RealBytecodeOutput.c_str(), io_mode);
259 return PrintAndReturn(argv[0], "error opening '" + RealBytecodeOutput +
262 // Ensure that the bytecode file gets removed from the disk if we get a
264 sys::RemoveFileOnSignal(sys::Path(RealBytecodeOutput));
266 // Strip everything if Strip is set, otherwise if stripdebug is set, just
268 int StripLevel = Strip ? 2 : (StripDebug ? 1 : 0);
270 // Internalize the module if neither -disable-internalize nor
271 // -link-as-library are passed in.
272 bool ShouldInternalize = !NoInternalize & !LinkAsLibrary;
274 // Generate the bytecode file.
275 if (GenerateBytecode(Composite.get(), StripLevel, ShouldInternalize, &Out)){
277 return PrintAndReturn(argv[0], "error generating bytecode");
280 // Close the bytecode file.
283 // Generate either a native file or a JIT shell script. If the user wants
284 // to generate a native file, compile it from the bytecode file. Otherwise,
285 // if the target is not a library, create a script that will run the
286 // bytecode through the JIT.
288 // Name of the Assembly Language output file
289 sys::Path AssemblyFile (OutputFilename);
290 AssemblyFile.appendSuffix("s");
292 // Mark the output files for removal if we get an interrupt.
293 sys::RemoveFileOnSignal(AssemblyFile);
294 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
296 // Determine the locations of the llc and gcc programs.
297 sys::Path llc = FindExecutable("llc", argv[0]);
299 return PrintAndReturn(argv[0], "Failed to find llc");
301 sys::Path gcc = FindExecutable("gcc", argv[0]);
303 return PrintAndReturn(argv[0], "Failed to find gcc");
305 // Generate an assembly language file for the bytecode.
306 if (Verbose) std::cout << "Generating Assembly Code\n";
307 GenerateAssembly(AssemblyFile.toString(), RealBytecodeOutput, llc,
309 if (Verbose) std::cout << "Generating Native Code\n";
310 GenerateNative(OutputFilename, AssemblyFile.toString(),
311 LibPaths, Libraries, gcc, envp, LinkAsLibrary, RPath,
315 // Remove the assembly language file.
316 AssemblyFile.destroyFile();
317 // Remove the bytecode language file.
318 sys::Path(RealBytecodeOutput).destroyFile();
321 } else if (NativeCBE) {
322 sys::Path CFile (OutputFilename);
323 CFile.appendSuffix("cbe.c");
325 // Mark the output files for removal if we get an interrupt.
326 sys::RemoveFileOnSignal(CFile);
327 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
329 // Determine the locations of the llc and gcc programs.
330 sys::Path llc = FindExecutable("llc", argv[0]);
332 return PrintAndReturn(argv[0], "Failed to find llc");
334 sys::Path gcc = FindExecutable("gcc", argv[0]);
336 return PrintAndReturn(argv[0], "Failed to find gcc");
338 // Generate an assembly language file for the bytecode.
339 if (Verbose) std::cout << "Generating C Source Code\n";
340 GenerateCFile(CFile.toString(), RealBytecodeOutput, llc, Verbose);
341 if (Verbose) std::cout << "Generating Native Code\n";
342 GenerateNative(OutputFilename, CFile.toString(),
343 LibPaths, Libraries, gcc, envp, LinkAsLibrary, RPath,
347 // Remove the assembly language file.
349 // Remove the bytecode language file.
350 sys::Path(RealBytecodeOutput).destroyFile();
353 } else if (!LinkAsLibrary) {
354 EmitShellScript(argv);
356 // Make the bytecode file readable and directly executable in LLEE
357 sys::Path(RealBytecodeOutput).makeExecutable();
358 sys::Path(RealBytecodeOutput).makeReadable();
361 // Make the output, whether native or script, executable as well...
362 sys::Path(OutputFilename).makeExecutable();
364 } catch (const char*msg) {
365 std::cerr << argv[0] << ": " << msg << "\n";
367 } catch (const std::string& msg) {
368 std::cerr << argv[0] << ": " << msg << "\n";
371 // This really shouldn't happen, but just in case ....
372 std::cerr << argv[0] << ": An unexpected unknown exception occurred.\n";