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Reid Spencerc0af3f02004-09-13 01:27:53 +00001//===- llvm-ld.cpp - LLVM 'ld' compatible linker --------------------------===//
Misha Brukman3da94ae2005-04-22 00:00:37 +00002//
Reid Spencerc0af3f02004-09-13 01:27:53 +00003// The LLVM Compiler Infrastructure
4//
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.
Misha Brukman3da94ae2005-04-22 00:00:37 +00007//
Reid Spencerc0af3f02004-09-13 01:27:53 +00008//===----------------------------------------------------------------------===//
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 bytecode file actually lives in
15// the a.out.bc file generated by this program. Also, Force is on by default.
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
Reid Spenceraf303d52006-06-07 23:03:13 +000023#include "llvm/LinkAllVMCore.h"
Reid Spencer605b9e22004-11-14 23:00:08 +000024#include "llvm/Linker.h"
Reid Spencer6da1e0d2004-12-14 04:20:08 +000025#include "llvm/System/Program.h"
Reid Spencerc0af3f02004-09-13 01:27:53 +000026#include "llvm/Module.h"
27#include "llvm/PassManager.h"
28#include "llvm/Bytecode/Reader.h"
Reid Spencer445564a2004-11-20 20:02:56 +000029#include "llvm/Bytecode/Writer.h"
Reid Spencerc0af3f02004-09-13 01:27:53 +000030#include "llvm/Target/TargetData.h"
Reid Spenceraefd04b2004-09-25 16:00:07 +000031#include "llvm/Target/TargetMachine.h"
32#include "llvm/Target/TargetMachineRegistry.h"
Reid Spencerc0af3f02004-09-13 01:27:53 +000033#include "llvm/Support/CommandLine.h"
34#include "llvm/Support/FileUtilities.h"
Bill Wendling68fe61d2006-11-29 00:19:40 +000035#include "llvm/Support/Streams.h"
Reid Spencerc0af3f02004-09-13 01:27:53 +000036#include "llvm/Support/SystemUtils.h"
Reid Spencer445564a2004-11-20 20:02:56 +000037#include "llvm/System/Signals.h"
Reid Spencerc0af3f02004-09-13 01:27:53 +000038#include <fstream>
39#include <memory>
40using namespace llvm;
41
Reid Spencer445564a2004-11-20 20:02:56 +000042// Input/Output Options
43static cl::list<std::string> InputFilenames(cl::Positional, cl::OneOrMore,
44 cl::desc("<input bytecode files>"));
Reid Spencerc0af3f02004-09-13 01:27:53 +000045
Reid Spencer445564a2004-11-20 20:02:56 +000046static cl::opt<std::string> OutputFilename("o", cl::init("a.out"),
Misha Brukman3da94ae2005-04-22 00:00:37 +000047 cl::desc("Override output filename"),
Reid Spencer445564a2004-11-20 20:02:56 +000048 cl::value_desc("filename"));
Reid Spencerc0af3f02004-09-13 01:27:53 +000049
Misha Brukman3da94ae2005-04-22 00:00:37 +000050static cl::opt<bool> Verbose("v",
Reid Spencer445564a2004-11-20 20:02:56 +000051 cl::desc("Print information about actions taken"));
Misha Brukman3da94ae2005-04-22 00:00:37 +000052
Reid Spencer445564a2004-11-20 20:02:56 +000053static cl::list<std::string> LibPaths("L", cl::Prefix,
Misha Brukman3da94ae2005-04-22 00:00:37 +000054 cl::desc("Specify a library search path"),
Reid Spencer445564a2004-11-20 20:02:56 +000055 cl::value_desc("directory"));
Reid Spencerc0af3f02004-09-13 01:27:53 +000056
Reid Spencer445564a2004-11-20 20:02:56 +000057static cl::list<std::string> Libraries("l", cl::Prefix,
Misha Brukman3da94ae2005-04-22 00:00:37 +000058 cl::desc("Specify libraries to link to"),
Reid Spencer445564a2004-11-20 20:02:56 +000059 cl::value_desc("library prefix"));
Reid Spencerc0af3f02004-09-13 01:27:53 +000060
Misha Brukman3da94ae2005-04-22 00:00:37 +000061static cl::opt<bool> LinkAsLibrary("link-as-library",
Reid Spencer445564a2004-11-20 20:02:56 +000062 cl::desc("Link the .bc files together as a library, not an executable"));
Reid Spencerc0af3f02004-09-13 01:27:53 +000063
Reid Spencer445564a2004-11-20 20:02:56 +000064static cl::alias Relink("r", cl::aliasopt(LinkAsLibrary),
65 cl::desc("Alias for -link-as-library"));
Reid Spencerc0af3f02004-09-13 01:27:53 +000066
Reid Spencer445564a2004-11-20 20:02:56 +000067static cl::opt<const TargetMachineRegistry::Entry*, false, TargetNameParser>
Reid Spenceraefd04b2004-09-25 16:00:07 +000068 MachineArch("march", cl::desc("Architecture to generate assembly for:"));
69
Reid Spencer445564a2004-11-20 20:02:56 +000070static cl::opt<bool> Native("native",
71 cl::desc("Generate a native binary instead of a shell script"));
Reid Spencerc0af3f02004-09-13 01:27:53 +000072
Reid Spencer445564a2004-11-20 20:02:56 +000073static cl::opt<bool>NativeCBE("native-cbe",
74 cl::desc("Generate a native binary with the C backend and GCC"));
75
76static cl::opt<bool>DisableCompression("disable-compression",cl::init(false),
77 cl::desc("Disable writing of compressed bytecode files"));
Misha Brukman3da94ae2005-04-22 00:00:37 +000078
Reid Spencer73a74be2005-12-21 05:03:23 +000079static cl::list<std::string> PostLinkOpts("post-link-opts",
Reid Spenceraf303d52006-06-07 23:03:13 +000080 cl::value_desc("path"),
Reid Spencer73a74be2005-12-21 05:03:23 +000081 cl::desc("Run one or more optimization programs after linking"));
82
Reid Spenceraf303d52006-06-07 23:03:13 +000083static cl::list<std::string> XLinker("Xlinker", cl::value_desc("option"),
84 cl::desc("Pass options to the system linker"));
85
Reid Spencer445564a2004-11-20 20:02:56 +000086// Compatibility options that are ignored but supported by LD
Misha Brukman3da94ae2005-04-22 00:00:37 +000087static cl::opt<std::string> CO3("soname", cl::Hidden,
Reid Spencer445564a2004-11-20 20:02:56 +000088 cl::desc("Compatibility option: ignored"));
89
Misha Brukman3da94ae2005-04-22 00:00:37 +000090static cl::opt<std::string> CO4("version-script", cl::Hidden,
Reid Spencer445564a2004-11-20 20:02:56 +000091 cl::desc("Compatibility option: ignored"));
92
Misha Brukman3da94ae2005-04-22 00:00:37 +000093static cl::opt<bool> CO5("eh-frame-hdr", cl::Hidden,
Reid Spencer445564a2004-11-20 20:02:56 +000094 cl::desc("Compatibility option: ignored"));
95
Misha Brukman3da94ae2005-04-22 00:00:37 +000096static cl::opt<std::string> CO6("h", cl::Hidden,
Reid Spencer445564a2004-11-20 20:02:56 +000097 cl::desc("Compatibility option: ignored"));
98
Reid Spenceraf303d52006-06-07 23:03:13 +000099
Reid Spencer445564a2004-11-20 20:02:56 +0000100/// This is just for convenience so it doesn't have to be passed around
101/// everywhere.
Reid Spencerc4064132004-12-13 03:01:14 +0000102static std::string progname;
Reid Spencerc0af3f02004-09-13 01:27:53 +0000103
104/// PrintAndReturn - Prints a message to standard error and returns true.
105///
106/// Inputs:
107/// progname - The name of the program (i.e. argv[0]).
108/// Message - The message to print to standard error.
109///
Reid Spencer445564a2004-11-20 20:02:56 +0000110static int PrintAndReturn(const std::string &Message) {
Bill Wendling68fe61d2006-11-29 00:19:40 +0000111 llvm_cerr << progname << ": " << Message << "\n";
Reid Spencerc0af3f02004-09-13 01:27:53 +0000112 return 1;
113}
114
Reid Spencer445564a2004-11-20 20:02:56 +0000115/// CopyEnv - This function takes an array of environment variables and makes a
116/// copy of it. This copy can then be manipulated any way the caller likes
117/// without affecting the process's real environment.
118///
119/// Inputs:
120/// envp - An array of C strings containing an environment.
121///
122/// Return value:
123/// NULL - An error occurred.
124///
125/// Otherwise, a pointer to a new array of C strings is returned. Every string
126/// in the array is a duplicate of the one in the original array (i.e. we do
127/// not copy the char *'s from one array to another).
128///
129static char ** CopyEnv(char ** const envp) {
130 // Count the number of entries in the old list;
131 unsigned entries; // The number of entries in the old environment list
132 for (entries = 0; envp[entries] != NULL; entries++)
133 /*empty*/;
134
135 // Add one more entry for the NULL pointer that ends the list.
136 ++entries;
137
138 // If there are no entries at all, just return NULL.
139 if (entries == 0)
140 return NULL;
141
142 // Allocate a new environment list.
143 char **newenv = new char* [entries];
144 if ((newenv = new char* [entries]) == NULL)
145 return NULL;
146
147 // Make a copy of the list. Don't forget the NULL that ends the list.
148 entries = 0;
149 while (envp[entries] != NULL) {
150 newenv[entries] = new char[strlen (envp[entries]) + 1];
151 strcpy (newenv[entries], envp[entries]);
152 ++entries;
153 }
154 newenv[entries] = NULL;
155
156 return newenv;
157}
158
159
160/// RemoveEnv - Remove the specified environment variable from the environment
161/// array.
162///
163/// Inputs:
164/// name - The name of the variable to remove. It cannot be NULL.
165/// envp - The array of environment variables. It cannot be NULL.
166///
167/// Notes:
168/// This is mainly done because functions to remove items from the environment
169/// are not available across all platforms. In particular, Solaris does not
170/// seem to have an unsetenv() function or a setenv() function (or they are
171/// undocumented if they do exist).
172///
173static void RemoveEnv(const char * name, char ** const envp) {
174 for (unsigned index=0; envp[index] != NULL; index++) {
175 // Find the first equals sign in the array and make it an EOS character.
176 char *p = strchr (envp[index], '=');
177 if (p == NULL)
178 continue;
179 else
180 *p = '\0';
181
182 // Compare the two strings. If they are equal, zap this string.
183 // Otherwise, restore it.
184 if (!strcmp(name, envp[index]))
185 *envp[index] = '\0';
186 else
187 *p = '=';
188 }
189
190 return;
191}
192
193/// GenerateBytecode - generates a bytecode file from the module provided
194void GenerateBytecode(Module* M, const std::string& FileName) {
195
196 // Create the output file.
Jeff Cohen5fb6ed42005-01-22 17:36:17 +0000197 std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
198 std::ios::binary;
199 std::ofstream Out(FileName.c_str(), io_mode);
Reid Spencer445564a2004-11-20 20:02:56 +0000200 if (!Out.good()) {
201 PrintAndReturn("error opening '" + FileName + "' for writing!");
202 return;
203 }
204
205 // Ensure that the bytecode file gets removed from the disk if we get a
206 // terminating signal.
207 sys::RemoveFileOnSignal(sys::Path(FileName));
208
209 // Write it out
Bill Wendling68fe61d2006-11-29 00:19:40 +0000210 llvm_ostream L(Out);
211 WriteBytecodeToFile(M, L, !DisableCompression);
Reid Spencer445564a2004-11-20 20:02:56 +0000212
213 // Close the bytecode file.
214 Out.close();
215}
216
217/// GenerateAssembly - generates a native assembly language source file from the
218/// specified bytecode file.
219///
220/// Inputs:
Devang Patele2f8ad82006-06-27 18:07:29 +0000221/// InputFilename - The name of the input bytecode file.
Reid Spencer445564a2004-11-20 20:02:56 +0000222/// OutputFilename - The name of the file to generate.
223/// llc - The pathname to use for LLC.
224/// envp - The environment to use when running LLC.
225///
226/// Return non-zero value on error.
227///
228static int GenerateAssembly(const std::string &OutputFilename,
229 const std::string &InputFilename,
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000230 const sys::Path &llc,
231 std::string &ErrMsg ) {
Reid Spencer445564a2004-11-20 20:02:56 +0000232 // Run LLC to convert the bytecode file into assembly code.
Reid Spencerf6358c72004-12-19 18:00:56 +0000233 std::vector<const char*> args;
Chris Lattnerbf9add42005-04-10 20:59:38 +0000234 args.push_back(llc.c_str());
235 args.push_back("-f");
236 args.push_back("-o");
237 args.push_back(OutputFilename.c_str());
238 args.push_back(InputFilename.c_str());
Chris Lattner7456e3c2005-02-13 23:10:45 +0000239 args.push_back(0);
Reid Spencer445564a2004-11-20 20:02:56 +0000240
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000241 return sys::Program::ExecuteAndWait(llc,&args[0],0,0,0,&ErrMsg);
Reid Spencer445564a2004-11-20 20:02:56 +0000242}
243
Devang Patele2f8ad82006-06-27 18:07:29 +0000244/// GenerateCFile - generates a C source file from the specified bytecode file.
Reid Spencer445564a2004-11-20 20:02:56 +0000245static int GenerateCFile(const std::string &OutputFile,
246 const std::string &InputFile,
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000247 const sys::Path &llc,
248 std::string& ErrMsg) {
Reid Spencer445564a2004-11-20 20:02:56 +0000249 // Run LLC to convert the bytecode file into C.
Reid Spencerf6358c72004-12-19 18:00:56 +0000250 std::vector<const char*> args;
Chris Lattnerbf9add42005-04-10 20:59:38 +0000251 args.push_back(llc.c_str());
252 args.push_back("-march=c");
253 args.push_back("-f");
254 args.push_back("-o");
255 args.push_back(OutputFile.c_str());
256 args.push_back(InputFile.c_str());
Chris Lattner7456e3c2005-02-13 23:10:45 +0000257 args.push_back(0);
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000258 return sys::Program::ExecuteAndWait(llc, &args[0],0,0,0,&ErrMsg);
Reid Spencer445564a2004-11-20 20:02:56 +0000259}
260
Devang Patele2f8ad82006-06-27 18:07:29 +0000261/// GenerateNative - generates a native object file from the
262/// specified bytecode file.
Reid Spencer445564a2004-11-20 20:02:56 +0000263///
264/// Inputs:
Devang Patele2f8ad82006-06-27 18:07:29 +0000265/// InputFilename - The name of the input bytecode file.
Reid Spencer445564a2004-11-20 20:02:56 +0000266/// OutputFilename - The name of the file to generate.
Reid Spencer49521432006-11-11 11:54:25 +0000267/// LinkItems - The native libraries, files, code with which to link
Reid Spencer445564a2004-11-20 20:02:56 +0000268/// LibPaths - The list of directories in which to find libraries.
269/// gcc - The pathname to use for GGC.
270/// envp - A copy of the process's current environment.
271///
272/// Outputs:
273/// None.
274///
275/// Returns non-zero value on error.
276///
277static int GenerateNative(const std::string &OutputFilename,
278 const std::string &InputFilename,
Reid Spencer49521432006-11-11 11:54:25 +0000279 const Linker::ItemList &LinkItems,
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000280 const sys::Path &gcc, char ** const envp,
281 std::string& ErrMsg) {
Reid Spencer445564a2004-11-20 20:02:56 +0000282 // Remove these environment variables from the environment of the
283 // programs that we will execute. It appears that GCC sets these
284 // environment variables so that the programs it uses can configure
285 // themselves identically.
286 //
287 // However, when we invoke GCC below, we want it to use its normal
288 // configuration. Hence, we must sanitize its environment.
289 char ** clean_env = CopyEnv(envp);
290 if (clean_env == NULL)
291 return 1;
292 RemoveEnv("LIBRARY_PATH", clean_env);
293 RemoveEnv("COLLECT_GCC_OPTIONS", clean_env);
294 RemoveEnv("GCC_EXEC_PREFIX", clean_env);
295 RemoveEnv("COMPILER_PATH", clean_env);
296 RemoveEnv("COLLECT_GCC", clean_env);
297
Reid Spencer445564a2004-11-20 20:02:56 +0000298
299 // Run GCC to assemble and link the program into native code.
300 //
301 // Note:
302 // We can't just assemble and link the file with the system assembler
303 // and linker because we don't know where to put the _start symbol.
304 // GCC mysteriously knows how to do it.
Reid Spencerf6358c72004-12-19 18:00:56 +0000305 std::vector<const char*> args;
Chris Lattnerbf9add42005-04-10 20:59:38 +0000306 args.push_back(gcc.c_str());
Reid Spencer6da1e0d2004-12-14 04:20:08 +0000307 args.push_back("-fno-strict-aliasing");
308 args.push_back("-O3");
309 args.push_back("-o");
Reid Spencerf6358c72004-12-19 18:00:56 +0000310 args.push_back(OutputFilename.c_str());
311 args.push_back(InputFilename.c_str());
Reid Spencer445564a2004-11-20 20:02:56 +0000312
Reid Spenceraf303d52006-06-07 23:03:13 +0000313 // Add in the library paths
314 for (unsigned index = 0; index < LibPaths.size(); index++) {
315 args.push_back("-L");
316 args.push_back(LibPaths[index].c_str());
317 }
318
319 // Add the requested options
320 for (unsigned index = 0; index < XLinker.size(); index++) {
321 args.push_back(XLinker[index].c_str());
322 args.push_back(Libraries[index].c_str());
323 }
324
Reid Spencer445564a2004-11-20 20:02:56 +0000325 // Add in the libraries to link.
Reid Spencer49521432006-11-11 11:54:25 +0000326 for (unsigned index = 0; index < LinkItems.size(); index++)
327 if (LinkItems[index].first != "crtend") {
328 if (LinkItems[index].second) {
Reid Spencer2803b4c2006-11-11 19:59:25 +0000329 std::string lib_name = "-l" + LinkItems[index].first;
330 args.push_back(lib_name.c_str());
Reid Spencer49521432006-11-11 11:54:25 +0000331 } else
Reid Spencer2803b4c2006-11-11 19:59:25 +0000332 args.push_back(LinkItems[index].first.c_str());
Reid Spencerf6358c72004-12-19 18:00:56 +0000333 }
Reid Spenceraf303d52006-06-07 23:03:13 +0000334
Chris Lattner7456e3c2005-02-13 23:10:45 +0000335 args.push_back(0);
Reid Spencer445564a2004-11-20 20:02:56 +0000336
337 // Run the compiler to assembly and link together the program.
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000338 int R = sys::Program::ExecuteAndWait(
339 gcc, &args[0], (const char**)clean_env,0,0,&ErrMsg);
Chris Lattner2f863622006-05-14 18:38:13 +0000340 delete [] clean_env;
341 return R;
Reid Spencer445564a2004-11-20 20:02:56 +0000342}
343
Reid Spencerc0af3f02004-09-13 01:27:53 +0000344/// EmitShellScript - Output the wrapper file that invokes the JIT on the LLVM
345/// bytecode file for the program.
346static void EmitShellScript(char **argv) {
347#if defined(_WIN32) || defined(__CYGWIN__)
348 // Windows doesn't support #!/bin/sh style shell scripts in .exe files. To
349 // support windows systems, we copy the llvm-stub.exe executable from the
350 // build tree to the destination file.
Anton Korobeynikov7d515442006-09-01 20:35:17 +0000351 std::string ErrMsg;
Reid Spencer8d8b41d2004-12-22 13:50:17 +0000352 sys::Path llvmstub = FindExecutable("llvm-stub.exe", argv[0]);
353 if (llvmstub.isEmpty()) {
Bill Wendling68fe61d2006-11-29 00:19:40 +0000354 llvm_cerr << "Could not find llvm-stub.exe executable!\n";
Reid Spencerc0af3f02004-09-13 01:27:53 +0000355 exit(1);
356 }
Anton Korobeynikov7d515442006-09-01 20:35:17 +0000357
358 if (0 != sys::CopyFile(sys::Path(OutputFilename), llvmstub, &ErrMsg)) {
Bill Wendling68fe61d2006-11-29 00:19:40 +0000359 llvm_cerr << argv[0] << ": " << ErrMsg << "\n";
Anton Korobeynikov7d515442006-09-01 20:35:17 +0000360 exit(1);
361 }
362
Reid Spencerc0af3f02004-09-13 01:27:53 +0000363 return;
364#endif
365
366 // Output the script to start the program...
367 std::ofstream Out2(OutputFilename.c_str());
368 if (!Out2.good())
Reid Spencer445564a2004-11-20 20:02:56 +0000369 exit(PrintAndReturn("error opening '" + OutputFilename + "' for writing!"));
Reid Spencerc0af3f02004-09-13 01:27:53 +0000370
371 Out2 << "#!/bin/sh\n";
372 // Allow user to setenv LLVMINTERP if lli is not in their PATH.
373 Out2 << "lli=${LLVMINTERP-lli}\n";
374 Out2 << "exec $lli \\\n";
375 // gcc accepts -l<lib> and implicitly searches /lib and /usr/lib.
376 LibPaths.push_back("/lib");
377 LibPaths.push_back("/usr/lib");
378 LibPaths.push_back("/usr/X11R6/lib");
379 // We don't need to link in libc! In fact, /usr/lib/libc.so may not be a
380 // shared object at all! See RH 8: plain text.
Misha Brukman3da94ae2005-04-22 00:00:37 +0000381 std::vector<std::string>::iterator libc =
Reid Spencerc0af3f02004-09-13 01:27:53 +0000382 std::find(Libraries.begin(), Libraries.end(), "c");
383 if (libc != Libraries.end()) Libraries.erase(libc);
384 // List all the shared object (native) libraries this executable will need
385 // on the command line, so that we don't have to do this manually!
Misha Brukman3da94ae2005-04-22 00:00:37 +0000386 for (std::vector<std::string>::iterator i = Libraries.begin(),
Reid Spencerc0af3f02004-09-13 01:27:53 +0000387 e = Libraries.end(); i != e; ++i) {
Reid Spencerc4064132004-12-13 03:01:14 +0000388 sys::Path FullLibraryPath = sys::Path::FindLibrary(*i);
389 if (!FullLibraryPath.isEmpty() && FullLibraryPath.isDynamicLibrary())
390 Out2 << " -load=" << FullLibraryPath.toString() << " \\\n";
Reid Spencerc0af3f02004-09-13 01:27:53 +0000391 }
392 Out2 << " $0.bc ${1+\"$@\"}\n";
393 Out2.close();
394}
395
Reid Spencerc4064132004-12-13 03:01:14 +0000396// BuildLinkItems -- This function generates a LinkItemList for the LinkItems
397// linker function by combining the Files and Libraries in the order they were
398// declared on the command line.
399static void BuildLinkItems(
400 Linker::ItemList& Items,
401 const cl::list<std::string>& Files,
402 const cl::list<std::string>& Libraries) {
403
Misha Brukman3da94ae2005-04-22 00:00:37 +0000404 // Build the list of linkage items for LinkItems.
Reid Spencerc4064132004-12-13 03:01:14 +0000405
406 cl::list<std::string>::const_iterator fileIt = Files.begin();
407 cl::list<std::string>::const_iterator libIt = Libraries.begin();
408
409 int libPos = -1, filePos = -1;
Reid Spencer05f7e792004-12-13 17:18:19 +0000410 while ( libIt != Libraries.end() || fileIt != Files.end() ) {
Reid Spencerc4064132004-12-13 03:01:14 +0000411 if (libIt != Libraries.end())
412 libPos = Libraries.getPosition(libIt - Libraries.begin());
413 else
414 libPos = -1;
415 if (fileIt != Files.end())
416 filePos = Files.getPosition(fileIt - Files.begin());
417 else
418 filePos = -1;
419
420 if (filePos != -1 && (libPos == -1 || filePos < libPos)) {
421 // Add a source file
422 Items.push_back(std::make_pair(*fileIt++, false));
423 } else if (libPos != -1 && (filePos == -1 || libPos < filePos)) {
424 // Add a library
425 Items.push_back(std::make_pair(*libIt++, true));
Reid Spencerc4064132004-12-13 03:01:14 +0000426 }
427 }
428}
429
Reid Spencer445564a2004-11-20 20:02:56 +0000430// Rightly this should go in a header file but it just seems such a waste.
431namespace llvm {
432extern void Optimize(Module*);
433}
434
Reid Spencerc0af3f02004-09-13 01:27:53 +0000435int main(int argc, char **argv, char **envp) {
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000436 try {
437 // Initial global variable above for convenience printing of program name.
438 progname = sys::Path(argv[0]).getBasename();
Misha Brukman3da94ae2005-04-22 00:00:37 +0000439
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000440 // Parse the command line options
441 cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
442 sys::PrintStackTraceOnErrorSignal();
Reid Spencerc0af3f02004-09-13 01:27:53 +0000443
Reid Spencer49521432006-11-11 11:54:25 +0000444 // Construct a Linker (now that Verbose is set)
445 Linker TheLinker(progname, OutputFilename, Verbose);
446 // Keep track of the native link items (vice the bytecode items)
447 Linker::ItemList LinkItems;
448
449 // Add library paths to the linker
Reid Spencer78df5c32006-03-06 06:38:19 +0000450 TheLinker.addPaths(LibPaths);
451 TheLinker.addSystemPaths();
452
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000453 // Remove any consecutive duplicates of the same library...
454 Libraries.erase(std::unique(Libraries.begin(), Libraries.end()),
455 Libraries.end());
Reid Spencerc0af3f02004-09-13 01:27:53 +0000456
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000457 if (LinkAsLibrary) {
458 std::vector<sys::Path> Files;
459 for (unsigned i = 0; i < InputFilenames.size(); ++i )
460 Files.push_back(sys::Path(InputFilenames[i]));
461 if (TheLinker.LinkInFiles(Files))
462 return 1; // Error already printed
Reid Spencer6b463b22004-12-08 05:17:40 +0000463
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000464 // The libraries aren't linked in but are noted as "dependent" in the
465 // module.
Misha Brukman3da94ae2005-04-22 00:00:37 +0000466 for (cl::list<std::string>::const_iterator I = Libraries.begin(),
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000467 E = Libraries.end(); I != E ; ++I) {
468 TheLinker.getModule()->addLibrary(*I);
469 }
Reid Spencerc0af3f02004-09-13 01:27:53 +0000470 } else {
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000471 // Build a list of the items from our command line
472 Linker::ItemList Items;
473 BuildLinkItems(Items, InputFilenames, Libraries);
474
475 // Link all the items together
Reid Spencer49521432006-11-11 11:54:25 +0000476 if (TheLinker.LinkInItems(Items,LinkItems) )
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000477 return 1;
Reid Spencerc0af3f02004-09-13 01:27:53 +0000478 }
Reid Spencerc0af3f02004-09-13 01:27:53 +0000479
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000480 std::auto_ptr<Module> Composite(TheLinker.releaseModule());
481
482 // Optimize the module
483 Optimize(Composite.get());
484
485 // Generate the bytecode for the optimized module.
486 std::string RealBytecodeOutput = OutputFilename;
487 if (!LinkAsLibrary) RealBytecodeOutput += ".bc";
488 GenerateBytecode(Composite.get(), RealBytecodeOutput);
489
490 // If we are not linking a library, generate either a native executable
491 // or a JIT shell script, depending upon what the user wants.
492 if (!LinkAsLibrary) {
Reid Spencer73a74be2005-12-21 05:03:23 +0000493 // If the user wants to run a post-link optimization, run it now.
494 if (!PostLinkOpts.empty()) {
495 std::vector<std::string> opts = PostLinkOpts;
496 for (std::vector<std::string>::iterator I = opts.begin(),
497 E = opts.end(); I != E; ++I) {
498 sys::Path prog(*I);
499 if (!prog.canExecute()) {
500 prog = sys::Program::FindProgramByName(*I);
501 if (prog.isEmpty())
502 return PrintAndReturn(std::string("Optimization program '") + *I +
503 "' is not found or not executable.");
504 }
505 // Get the program arguments
506 sys::Path tmp_output("opt_result");
Reid Spencere5c9cb52006-08-23 00:39:35 +0000507 std::string ErrMsg;
Reid Spencer7b289552006-11-05 19:53:08 +0000508 if (tmp_output.createTemporaryFileOnDisk(true, &ErrMsg)) {
Reid Spencere5c9cb52006-08-23 00:39:35 +0000509 return PrintAndReturn(ErrMsg);
Reid Spencer73a74be2005-12-21 05:03:23 +0000510 }
511 const char* args[4];
512 args[0] = I->c_str();
513 args[1] = RealBytecodeOutput.c_str();
514 args[2] = tmp_output.c_str();
515 args[3] = 0;
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000516 if (0 == sys::Program::ExecuteAndWait(prog, args, 0,0,0, &ErrMsg)) {
Reid Spencer73a74be2005-12-21 05:03:23 +0000517 if (tmp_output.isBytecodeFile()) {
518 sys::Path target(RealBytecodeOutput);
519 target.eraseFromDisk();
Reid Spencer5a060772006-08-23 07:30:48 +0000520 if (tmp_output.renamePathOnDisk(target, &ErrMsg)) {
Bill Wendling68fe61d2006-11-29 00:19:40 +0000521 llvm_cerr << argv[0] << ": " << ErrMsg << "\n";
Reid Spencer5a060772006-08-23 07:30:48 +0000522 return 2;
523 }
Reid Spencer73a74be2005-12-21 05:03:23 +0000524 } else
525 return PrintAndReturn(
526 "Post-link optimization output is not bytecode");
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000527 } else {
Bill Wendling68fe61d2006-11-29 00:19:40 +0000528 llvm_cerr << argv[0] << ": " << ErrMsg << "\n";
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000529 return 2;
Reid Spencer73a74be2005-12-21 05:03:23 +0000530 }
531 }
532 }
533
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000534 // If the user wants to generate a native executable, compile it from the
535 // bytecode file.
536 //
537 // Otherwise, create a script that will run the bytecode through the JIT.
538 if (Native) {
539 // Name of the Assembly Language output file
540 sys::Path AssemblyFile ( OutputFilename);
541 AssemblyFile.appendSuffix("s");
542
543 // Mark the output files for removal if we get an interrupt.
544 sys::RemoveFileOnSignal(AssemblyFile);
545 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
546
547 // Determine the locations of the llc and gcc programs.
548 sys::Path llc = FindExecutable("llc", argv[0]);
549 if (llc.isEmpty())
550 return PrintAndReturn("Failed to find llc");
551
552 sys::Path gcc = FindExecutable("gcc", argv[0]);
553 if (gcc.isEmpty())
554 return PrintAndReturn("Failed to find gcc");
555
556 // Generate an assembly language file for the bytecode.
Bill Wendling68fe61d2006-11-29 00:19:40 +0000557 if (Verbose) llvm_cout << "Generating Assembly Code\n";
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000558 std::string ErrMsg;
559 if (0 != GenerateAssembly(AssemblyFile.toString(), RealBytecodeOutput,
560 llc, ErrMsg)) {
Bill Wendling68fe61d2006-11-29 00:19:40 +0000561 llvm_cerr << argv[0] << ": " << ErrMsg << "\n";
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000562 return 1;
563 }
564
Bill Wendling68fe61d2006-11-29 00:19:40 +0000565 if (Verbose) llvm_cout << "Generating Native Code\n";
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000566 if (0 != GenerateNative(OutputFilename, AssemblyFile.toString(),
Reid Spencer49521432006-11-11 11:54:25 +0000567 LinkItems,gcc,envp,ErrMsg)) {
Bill Wendling68fe61d2006-11-29 00:19:40 +0000568 llvm_cerr << argv[0] << ": " << ErrMsg << "\n";
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000569 return 1;
570 }
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000571
572 // Remove the assembly language file.
Reid Spencera229c5c2005-07-08 03:08:58 +0000573 AssemblyFile.eraseFromDisk();
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000574 } else if (NativeCBE) {
575 sys::Path CFile (OutputFilename);
576 CFile.appendSuffix("cbe.c");
577
578 // Mark the output files for removal if we get an interrupt.
579 sys::RemoveFileOnSignal(CFile);
580 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
581
582 // Determine the locations of the llc and gcc programs.
583 sys::Path llc = FindExecutable("llc", argv[0]);
584 if (llc.isEmpty())
585 return PrintAndReturn("Failed to find llc");
586
587 sys::Path gcc = FindExecutable("gcc", argv[0]);
588 if (gcc.isEmpty())
589 return PrintAndReturn("Failed to find gcc");
590
591 // Generate an assembly language file for the bytecode.
Bill Wendling68fe61d2006-11-29 00:19:40 +0000592 if (Verbose) llvm_cout << "Generating Assembly Code\n";
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000593 std::string ErrMsg;
594 if (0 != GenerateCFile(
595 CFile.toString(), RealBytecodeOutput, llc, ErrMsg)) {
Bill Wendling68fe61d2006-11-29 00:19:40 +0000596 llvm_cerr << argv[0] << ": " << ErrMsg << "\n";
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000597 return 1;
598 }
599
Bill Wendling68fe61d2006-11-29 00:19:40 +0000600 if (Verbose) llvm_cout << "Generating Native Code\n";
Reid Spencer49521432006-11-11 11:54:25 +0000601 if (0 != GenerateNative(OutputFilename, CFile.toString(), LinkItems,
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000602 gcc, envp, ErrMsg)) {
Bill Wendling68fe61d2006-11-29 00:19:40 +0000603 llvm_cerr << argv[0] << ": " << ErrMsg << "\n";
Reid Spencer8ea5ecb2006-08-21 06:04:45 +0000604 return 1;
605 }
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000606
607 // Remove the assembly language file.
Reid Spencera229c5c2005-07-08 03:08:58 +0000608 CFile.eraseFromDisk();
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000609
610 } else {
611 EmitShellScript(argv);
612 }
Misha Brukman3da94ae2005-04-22 00:00:37 +0000613
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000614 // Make the script executable...
Reid Spencere1647f42006-08-22 23:27:23 +0000615 std::string ErrMsg;
616 if (sys::Path(OutputFilename).makeExecutableOnDisk(&ErrMsg)) {
Bill Wendling68fe61d2006-11-29 00:19:40 +0000617 llvm_cerr << argv[0] << ": " << ErrMsg << "\n";
Reid Spencere1647f42006-08-22 23:27:23 +0000618 return 1;
619 }
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000620
621 // Make the bytecode file readable and directly executable in LLEE as well
Reid Spencere1647f42006-08-22 23:27:23 +0000622 if (sys::Path(RealBytecodeOutput).makeExecutableOnDisk(&ErrMsg)) {
Bill Wendling68fe61d2006-11-29 00:19:40 +0000623 llvm_cerr << argv[0] << ": " << ErrMsg << "\n";
Reid Spencere1647f42006-08-22 23:27:23 +0000624 return 1;
625 }
626 if (sys::Path(RealBytecodeOutput).makeReadableOnDisk(&ErrMsg)) {
Bill Wendling68fe61d2006-11-29 00:19:40 +0000627 llvm_cerr << argv[0] << ": " << ErrMsg << "\n";
Reid Spencere1647f42006-08-22 23:27:23 +0000628 return 1;
629 }
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000630 }
631
632 return 0;
633 } catch (const std::string& msg) {
Bill Wendling68fe61d2006-11-29 00:19:40 +0000634 llvm_cerr << argv[0] << ": " << msg << "\n";
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000635 } catch (...) {
Bill Wendling68fe61d2006-11-29 00:19:40 +0000636 llvm_cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
Reid Spencerc0af3f02004-09-13 01:27:53 +0000637 }
Reid Spencer1ef8bda2004-12-30 05:36:08 +0000638 return 1;
Reid Spencerc0af3f02004-09-13 01:27:53 +0000639}