llvm-ar.cpp revision 3baf01bd95586875274f6f36cf9931c8ebff2c39 
1//===-- llvm-ar.cpp - LLVM archive librarian utility ----------------------===//
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// Builds up (relatively) standard unix archive files (.a) containing LLVM
11// bitcode or other files.
12//
13//===----------------------------------------------------------------------===//
14
15#include "Archive.h"
16#include "llvm/IR/LLVMContext.h"
17#include "llvm/IR/Module.h"
18#include "llvm/Support/CommandLine.h"
19#include "llvm/Support/FileSystem.h"
20#include "llvm/Support/Format.h"
21#include "llvm/Support/ManagedStatic.h"
22#include "llvm/Support/PrettyStackTrace.h"
23#include "llvm/Support/Signals.h"
24#include "llvm/Support/raw_ostream.h"
25#include <algorithm>
26#include <cstdlib>
27#include <fstream>
28#include <memory>
29using namespace llvm;
30
31// Option for compatibility with AIX, not used but must allow it to be present.
32static cl::opt<bool>
33X32Option ("X32_64", cl::Hidden,
34            cl::desc("Ignored option for compatibility with AIX"));
35
36// llvm-ar operation code and modifier flags. This must come first.
37static cl::opt<std::string>
38Options(cl::Positional, cl::Required, cl::desc("{operation}[modifiers]..."));
39
40// llvm-ar remaining positional arguments.
41static cl::list<std::string>
42RestOfArgs(cl::Positional, cl::OneOrMore,
43    cl::desc("[relpos] [count] <archive-file> [members]..."));
44
45// MoreHelp - Provide additional help output explaining the operations and
46// modifiers of llvm-ar. This object instructs the CommandLine library
47// to print the text of the constructor when the --help option is given.
48static cl::extrahelp MoreHelp(
49  "\nOPERATIONS:\n"
50  "  d[NsS]       - delete file(s) from the archive\n"
51  "  m[abiSs]     - move file(s) in the archive\n"
52  "  p[kN]        - print file(s) found in the archive\n"
53  "  q[ufsS]      - quick append file(s) to the archive\n"
54  "  r[abfiuRsS]  - replace or insert file(s) into the archive\n"
55  "  t            - display contents of archive\n"
56  "  x[No]        - extract file(s) from the archive\n"
57  "\nMODIFIERS (operation specific):\n"
58  "  [a] - put file(s) after [relpos]\n"
59  "  [b] - put file(s) before [relpos] (same as [i])\n"
60  "  [f] - truncate inserted file names\n"
61  "  [i] - put file(s) before [relpos] (same as [b])\n"
62  "  [k] - always print bitcode files (default is to skip them)\n"
63  "  [N] - use instance [count] of name\n"
64  "  [o] - preserve original dates\n"
65  "  [P] - use full path names when matching\n"
66  "  [R] - recurse through directories when inserting\n"
67  "  [s] - create an archive index (cf. ranlib)\n"
68  "  [S] - do not build a symbol table\n"
69  "  [u] - update only files newer than archive contents\n"
70  "\nMODIFIERS (generic):\n"
71  "  [c] - do not warn if the library had to be created\n"
72  "  [v] - be verbose about actions taken\n"
73  "  [V] - be *really* verbose about actions taken\n"
74);
75
76// This enumeration delineates the kinds of operations on an archive
77// that are permitted.
78enum ArchiveOperation {
79  NoOperation,      ///< An operation hasn't been specified
80  Print,            ///< Print the contents of the archive
81  Delete,           ///< Delete the specified members
82  Move,             ///< Move members to end or as given by {a,b,i} modifiers
83  QuickAppend,      ///< Quickly append to end of archive
84  ReplaceOrInsert,  ///< Replace or Insert members
85  DisplayTable,     ///< Display the table of contents
86  Extract           ///< Extract files back to file system
87};
88
89// Modifiers to follow operation to vary behavior
90bool AddAfter = false;           ///< 'a' modifier
91bool AddBefore = false;          ///< 'b' modifier
92bool Create = false;             ///< 'c' modifier
93bool TruncateNames = false;      ///< 'f' modifier
94bool InsertBefore = false;       ///< 'i' modifier
95bool DontSkipBitcode = false;    ///< 'k' modifier
96bool UseCount = false;           ///< 'N' modifier
97bool OriginalDates = false;      ///< 'o' modifier
98bool FullPath = false;           ///< 'P' modifier
99bool SymTable = true;            ///< 's' & 'S' modifiers
100bool OnlyUpdate = false;         ///< 'u' modifier
101bool Verbose = false;            ///< 'v' modifier
102bool ReallyVerbose = false;      ///< 'V' modifier
103
104// Relative Positional Argument (for insert/move). This variable holds
105// the name of the archive member to which the 'a', 'b' or 'i' modifier
106// refers. Only one of 'a', 'b' or 'i' can be specified so we only need
107// one variable.
108std::string RelPos;
109
110// Select which of multiple entries in the archive with the same name should be
111// used (specified with -N) for the delete and extract operations.
112int Count = 1;
113
114// This variable holds the name of the archive file as given on the
115// command line.
116std::string ArchiveName;
117
118// This variable holds the list of member files to proecess, as given
119// on the command line.
120std::vector<std::string> Members;
121
122// This variable holds the (possibly expanded) list of path objects that
123// correspond to files we will
124std::set<std::string> Paths;
125
126// The Archive object to which all the editing operations will be sent.
127Archive* TheArchive = 0;
128
129// The name this program was invoked as.
130static const char *program_name;
131
132// show_help - Show the error message, the help message and exit.
133LLVM_ATTRIBUTE_NORETURN static void
134show_help(const std::string &msg) {
135  errs() << program_name << ": " << msg << "\n\n";
136  cl::PrintHelpMessage();
137  if (TheArchive)
138    delete TheArchive;
139  std::exit(1);
140}
141
142// fail - Show the error message and exit.
143LLVM_ATTRIBUTE_NORETURN static void
144fail(const std::string &msg) {
145  errs() << program_name << ": " << msg << "\n\n";
146  if (TheArchive)
147    delete TheArchive;
148  std::exit(1);
149}
150
151// getRelPos - Extract the member filename from the command line for
152// the [relpos] argument associated with a, b, and i modifiers
153void getRelPos() {
154  if(RestOfArgs.size() == 0)
155    show_help("Expected [relpos] for a, b, or i modifier");
156  RelPos = RestOfArgs[0];
157  RestOfArgs.erase(RestOfArgs.begin());
158}
159
160// getCount - Extract the [count] argument associated with the N modifier
161// from the command line and check its value.
162void getCount() {
163  if(RestOfArgs.size() == 0)
164    show_help("Expected [count] value with N modifier");
165
166  Count = atoi(RestOfArgs[0].c_str());
167  RestOfArgs.erase(RestOfArgs.begin());
168
169  // Non-positive counts are not allowed
170  if (Count < 1)
171    show_help("Invalid [count] value (not a positive integer)");
172}
173
174// getArchive - Get the archive file name from the command line
175void getArchive() {
176  if(RestOfArgs.size() == 0)
177    show_help("An archive name must be specified");
178  ArchiveName = RestOfArgs[0];
179  RestOfArgs.erase(RestOfArgs.begin());
180}
181
182// getMembers - Copy over remaining items in RestOfArgs to our Members vector
183// This is just for clarity.
184void getMembers() {
185  if(RestOfArgs.size() > 0)
186    Members = std::vector<std::string>(RestOfArgs);
187}
188
189// parseCommandLine - Parse the command line options as presented and return the
190// operation specified. Process all modifiers and check to make sure that
191// constraints on modifier/operation pairs have not been violated.
192ArchiveOperation parseCommandLine() {
193
194  // Keep track of number of operations. We can only specify one
195  // per execution.
196  unsigned NumOperations = 0;
197
198  // Keep track of the number of positional modifiers (a,b,i). Only
199  // one can be specified.
200  unsigned NumPositional = 0;
201
202  // Keep track of which operation was requested
203  ArchiveOperation Operation = NoOperation;
204
205  for(unsigned i=0; i<Options.size(); ++i) {
206    switch(Options[i]) {
207    case 'd': ++NumOperations; Operation = Delete; break;
208    case 'm': ++NumOperations; Operation = Move ; break;
209    case 'p': ++NumOperations; Operation = Print; break;
210    case 'q': ++NumOperations; Operation = QuickAppend; break;
211    case 'r': ++NumOperations; Operation = ReplaceOrInsert; break;
212    case 't': ++NumOperations; Operation = DisplayTable; break;
213    case 'x': ++NumOperations; Operation = Extract; break;
214    case 'c': Create = true; break;
215    case 'f': TruncateNames = true; break;
216    case 'k': DontSkipBitcode = true; break;
217    case 'l': /* accepted but unused */ break;
218    case 'o': OriginalDates = true; break;
219    case 'P': FullPath = true; break;
220    case 's': SymTable = true; break;
221    case 'S': SymTable = false; break;
222    case 'u': OnlyUpdate = true; break;
223    case 'v': Verbose = true; break;
224    case 'V': Verbose = ReallyVerbose = true; break;
225    case 'a':
226      getRelPos();
227      AddAfter = true;
228      NumPositional++;
229      break;
230    case 'b':
231      getRelPos();
232      AddBefore = true;
233      NumPositional++;
234      break;
235    case 'i':
236      getRelPos();
237      InsertBefore = true;
238      NumPositional++;
239      break;
240    case 'N':
241      getCount();
242      UseCount = true;
243      break;
244    default:
245      cl::PrintHelpMessage();
246    }
247  }
248
249  // At this point, the next thing on the command line must be
250  // the archive name.
251  getArchive();
252
253  // Everything on the command line at this point is a member.
254  getMembers();
255
256  // Perform various checks on the operation/modifier specification
257  // to make sure we are dealing with a legal request.
258  if (NumOperations == 0)
259    show_help("You must specify at least one of the operations");
260  if (NumOperations > 1)
261    show_help("Only one operation may be specified");
262  if (NumPositional > 1)
263    show_help("You may only specify one of a, b, and i modifiers");
264  if (AddAfter || AddBefore || InsertBefore) {
265    if (Operation != Move && Operation != ReplaceOrInsert)
266      show_help("The 'a', 'b' and 'i' modifiers can only be specified with "
267            "the 'm' or 'r' operations");
268  }
269  if (OriginalDates && Operation != Extract)
270    show_help("The 'o' modifier is only applicable to the 'x' operation");
271  if (TruncateNames && Operation!=QuickAppend && Operation!=ReplaceOrInsert)
272    show_help("The 'f' modifier is only applicable to the 'q' and 'r' "
273              "operations");
274  if (OnlyUpdate && Operation != ReplaceOrInsert)
275    show_help("The 'u' modifier is only applicable to the 'r' operation");
276  if (Count > 1 && Members.size() > 1)
277    show_help("Only one member name may be specified with the 'N' modifier");
278
279  // Return the parsed operation to the caller
280  return Operation;
281}
282
283// buildPaths - Convert the strings in the Members vector to sys::Path objects
284// and make sure they are valid and exist exist. This check is only needed for
285// the operations that add/replace files to the archive ('q' and 'r')
286bool buildPaths(bool checkExistence, std::string* ErrMsg) {
287  for (unsigned i = 0; i < Members.size(); i++) {
288    sys::Path aPath;
289    if (!aPath.set(Members[i]))
290      fail(std::string("File member name invalid: ") + Members[i]);
291    if (checkExistence) {
292      bool Exists;
293      if (sys::fs::exists(aPath.str(), Exists) || !Exists)
294        fail(std::string("File does not exist: ") + Members[i]);
295      std::string Err;
296      sys::PathWithStatus PwS(aPath);
297      const sys::FileStatus *si = PwS.getFileStatus(false, &Err);
298      if (!si)
299        fail(Err);
300      if (si->isDir)
301        fail(aPath.str() + " Is a directory");
302
303      Paths.insert(aPath.str());
304    } else {
305      Paths.insert(aPath.str());
306    }
307  }
308  return false;
309}
310
311// printSymbolTable - print out the archive's symbol table.
312void printSymbolTable() {
313  outs() << "\nArchive Symbol Table:\n";
314  const Archive::SymTabType& symtab = TheArchive->getSymbolTable();
315  for (Archive::SymTabType::const_iterator I=symtab.begin(), E=symtab.end();
316       I != E; ++I ) {
317    unsigned offset = TheArchive->getFirstFileOffset() + I->second;
318    outs() << " " << format("%9u", offset) << "\t" << I->first <<"\n";
319  }
320}
321
322// doPrint - Implements the 'p' operation. This function traverses the archive
323// looking for members that match the path list. It is careful to uncompress
324// things that should be and to skip bitcode files unless the 'k' modifier was
325// given.
326bool doPrint(std::string* ErrMsg) {
327  if (buildPaths(false, ErrMsg))
328    return true;
329  unsigned countDown = Count;
330  for (Archive::iterator I = TheArchive->begin(), E = TheArchive->end();
331       I != E; ++I ) {
332    if (Paths.empty() ||
333        (std::find(Paths.begin(), Paths.end(), I->getPath()) != Paths.end())) {
334      if (countDown == 1) {
335        const char* data = reinterpret_cast<const char*>(I->getData());
336
337        // Skip things that don't make sense to print
338        if (I->isSVR4SymbolTable() ||
339            I->isBSD4SymbolTable() || (!DontSkipBitcode && I->isBitcode()))
340          continue;
341
342        if (Verbose)
343          outs() << "Printing " << I->getPath().str() << "\n";
344
345        unsigned len = I->getSize();
346        outs().write(data, len);
347      } else {
348        countDown--;
349      }
350    }
351  }
352  return false;
353}
354
355// putMode - utility function for printing out the file mode when the 't'
356// operation is in verbose mode.
357void
358printMode(unsigned mode) {
359  if (mode & 004)
360    outs() << "r";
361  else
362    outs() << "-";
363  if (mode & 002)
364    outs() << "w";
365  else
366    outs() << "-";
367  if (mode & 001)
368    outs() << "x";
369  else
370    outs() << "-";
371}
372
373// doDisplayTable - Implement the 't' operation. This function prints out just
374// the file names of each of the members. However, if verbose mode is requested
375// ('v' modifier) then the file type, permission mode, user, group, size, and
376// modification time are also printed.
377bool
378doDisplayTable(std::string* ErrMsg) {
379  if (buildPaths(false, ErrMsg))
380    return true;
381  for (Archive::iterator I = TheArchive->begin(), E = TheArchive->end();
382       I != E; ++I ) {
383    if (Paths.empty() ||
384        (std::find(Paths.begin(), Paths.end(), I->getPath()) != Paths.end())) {
385      if (Verbose) {
386        // FIXME: Output should be this format:
387        // Zrw-r--r--  500/ 500    525 Nov  8 17:42 2004 Makefile
388        if (I->isBitcode())
389          outs() << "b";
390        else
391          outs() << " ";
392        unsigned mode = I->getMode();
393        printMode((mode >> 6) & 007);
394        printMode((mode >> 3) & 007);
395        printMode(mode & 007);
396        outs() << " " << format("%4u", I->getUser());
397        outs() << "/" << format("%4u", I->getGroup());
398        outs() << " " << format("%8u", I->getSize());
399        outs() << " " << format("%20s", I->getModTime().str().substr(4).c_str());
400        outs() << " " << I->getPath().str() << "\n";
401      } else {
402        outs() << I->getPath().str() << "\n";
403      }
404    }
405  }
406  if (ReallyVerbose)
407    printSymbolTable();
408  return false;
409}
410
411// doExtract - Implement the 'x' operation. This function extracts files back to
412// the file system.
413bool
414doExtract(std::string* ErrMsg) {
415  if (buildPaths(false, ErrMsg))
416    return true;
417  for (Archive::iterator I = TheArchive->begin(), E = TheArchive->end();
418       I != E; ++I ) {
419    if (Paths.empty() ||
420        (std::find(Paths.begin(), Paths.end(), I->getPath()) != Paths.end())) {
421
422      // Make sure the intervening directories are created
423      if (I->hasPath()) {
424        sys::Path dirs(I->getPath());
425        dirs.eraseComponent();
426        if (dirs.createDirectoryOnDisk(/*create_parents=*/true, ErrMsg))
427          return true;
428      }
429
430      // Open up a file stream for writing
431      std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
432                                   std::ios::binary;
433      std::ofstream file(I->getPath().str().c_str(), io_mode);
434
435      // Get the data and its length
436      const char* data = reinterpret_cast<const char*>(I->getData());
437      unsigned len = I->getSize();
438
439      // Write the data.
440      file.write(data,len);
441      file.close();
442
443      // If we're supposed to retain the original modification times, etc. do so
444      // now.
445      if (OriginalDates) {
446        sys::PathWithStatus PWS(I->getPath());
447        PWS.setStatusInfoOnDisk(I->getFileStatus());
448      }
449    }
450  }
451  return false;
452}
453
454// doDelete - Implement the delete operation. This function deletes zero or more
455// members from the archive. Note that if the count is specified, there should
456// be no more than one path in the Paths list or else this algorithm breaks.
457// That check is enforced in parseCommandLine (above).
458bool
459doDelete(std::string* ErrMsg) {
460  if (buildPaths(false, ErrMsg))
461    return true;
462  if (Paths.empty())
463    return false;
464  unsigned countDown = Count;
465  for (Archive::iterator I = TheArchive->begin(), E = TheArchive->end();
466       I != E; ) {
467    if (std::find(Paths.begin(), Paths.end(), I->getPath()) != Paths.end()) {
468      if (countDown == 1) {
469        Archive::iterator J = I;
470        ++I;
471        TheArchive->erase(J);
472      } else
473        countDown--;
474    } else {
475      ++I;
476    }
477  }
478
479  // We're done editting, reconstruct the archive.
480  if (TheArchive->writeToDisk(SymTable,TruncateNames,ErrMsg))
481    return true;
482  if (ReallyVerbose)
483    printSymbolTable();
484  return false;
485}
486
487// doMore - Implement the move operation. This function re-arranges just the
488// order of the archive members so that when the archive is written the move
489// of the members is accomplished. Note the use of the RelPos variable to
490// determine where the items should be moved to.
491bool
492doMove(std::string* ErrMsg) {
493  if (buildPaths(false, ErrMsg))
494    return true;
495
496  // By default and convention the place to move members to is the end of the
497  // archive.
498  Archive::iterator moveto_spot = TheArchive->end();
499
500  // However, if the relative positioning modifiers were used, we need to scan
501  // the archive to find the member in question. If we don't find it, its no
502  // crime, we just move to the end.
503  if (AddBefore || InsertBefore || AddAfter) {
504    for (Archive::iterator I = TheArchive->begin(), E= TheArchive->end();
505         I != E; ++I ) {
506      if (RelPos == I->getPath().str()) {
507        if (AddAfter) {
508          moveto_spot = I;
509          moveto_spot++;
510        } else {
511          moveto_spot = I;
512        }
513        break;
514      }
515    }
516  }
517
518  // Keep a list of the paths remaining to be moved
519  std::set<std::string> remaining(Paths);
520
521  // Scan the archive again, this time looking for the members to move to the
522  // moveto_spot.
523  for (Archive::iterator I = TheArchive->begin(), E= TheArchive->end();
524       I != E && !remaining.empty(); ++I ) {
525    std::set<std::string>::iterator found =
526      std::find(remaining.begin(),remaining.end(), I->getPath());
527    if (found != remaining.end()) {
528      if (I != moveto_spot)
529        TheArchive->splice(moveto_spot,*TheArchive,I);
530      remaining.erase(found);
531    }
532  }
533
534  // We're done editting, reconstruct the archive.
535  if (TheArchive->writeToDisk(SymTable,TruncateNames,ErrMsg))
536    return true;
537  if (ReallyVerbose)
538    printSymbolTable();
539  return false;
540}
541
542// doQuickAppend - Implements the 'q' operation. This function just
543// indiscriminantly adds the members to the archive and rebuilds it.
544bool
545doQuickAppend(std::string* ErrMsg) {
546  // Get the list of paths to append.
547  if (buildPaths(true, ErrMsg))
548    return true;
549  if (Paths.empty())
550    return false;
551
552  // Append them quickly.
553  for (std::set<std::string>::iterator PI = Paths.begin(), PE = Paths.end();
554       PI != PE; ++PI) {
555    if (TheArchive->addFileBefore(sys::Path(*PI),TheArchive->end(),ErrMsg))
556      return true;
557  }
558
559  // We're done editting, reconstruct the archive.
560  if (TheArchive->writeToDisk(SymTable,TruncateNames,ErrMsg))
561    return true;
562  if (ReallyVerbose)
563    printSymbolTable();
564  return false;
565}
566
567// doReplaceOrInsert - Implements the 'r' operation. This function will replace
568// any existing files or insert new ones into the archive.
569bool
570doReplaceOrInsert(std::string* ErrMsg) {
571
572  // Build the list of files to be added/replaced.
573  if (buildPaths(true, ErrMsg))
574    return true;
575  if (Paths.empty())
576    return false;
577
578  // Keep track of the paths that remain to be inserted.
579  std::set<std::string> remaining(Paths);
580
581  // Default the insertion spot to the end of the archive
582  Archive::iterator insert_spot = TheArchive->end();
583
584  // Iterate over the archive contents
585  for (Archive::iterator I = TheArchive->begin(), E = TheArchive->end();
586       I != E && !remaining.empty(); ++I ) {
587
588    // Determine if this archive member matches one of the paths we're trying
589    // to replace.
590
591    std::set<std::string>::iterator found = remaining.end();
592    for (std::set<std::string>::iterator RI = remaining.begin(),
593         RE = remaining.end(); RI != RE; ++RI ) {
594      std::string compare(*RI);
595      if (TruncateNames && compare.length() > 15) {
596        const char* nm = compare.c_str();
597        unsigned len = compare.length();
598        size_t slashpos = compare.rfind('/');
599        if (slashpos != std::string::npos) {
600          nm += slashpos + 1;
601          len -= slashpos +1;
602        }
603        if (len > 15)
604          len = 15;
605        compare.assign(nm,len);
606      }
607      if (compare == I->getPath().str()) {
608        found = RI;
609        break;
610      }
611    }
612
613    if (found != remaining.end()) {
614      std::string Err;
615      sys::PathWithStatus PwS(*found);
616      const sys::FileStatus *si = PwS.getFileStatus(false, &Err);
617      if (!si)
618        return true;
619      if (!si->isDir) {
620        if (OnlyUpdate) {
621          // Replace the item only if it is newer.
622          if (si->modTime > I->getModTime())
623            if (I->replaceWith(sys::Path(*found), ErrMsg))
624              return true;
625        } else {
626          // Replace the item regardless of time stamp
627          if (I->replaceWith(sys::Path(*found), ErrMsg))
628            return true;
629        }
630      } else {
631        // We purposefully ignore directories.
632      }
633
634      // Remove it from our "to do" list
635      remaining.erase(found);
636    }
637
638    // Determine if this is the place where we should insert
639    if ((AddBefore || InsertBefore) && RelPos == I->getPath().str())
640      insert_spot = I;
641    else if (AddAfter && RelPos == I->getPath().str()) {
642      insert_spot = I;
643      insert_spot++;
644    }
645  }
646
647  // If we didn't replace all the members, some will remain and need to be
648  // inserted at the previously computed insert-spot.
649  if (!remaining.empty()) {
650    for (std::set<std::string>::iterator PI = remaining.begin(),
651         PE = remaining.end(); PI != PE; ++PI) {
652      if (TheArchive->addFileBefore(sys::Path(*PI),insert_spot, ErrMsg))
653        return true;
654    }
655  }
656
657  // We're done editting, reconstruct the archive.
658  if (TheArchive->writeToDisk(SymTable,TruncateNames,ErrMsg))
659    return true;
660  if (ReallyVerbose)
661    printSymbolTable();
662  return false;
663}
664
665// main - main program for llvm-ar .. see comments in the code
666int main(int argc, char **argv) {
667  program_name = argv[0];
668  // Print a stack trace if we signal out.
669  sys::PrintStackTraceOnErrorSignal();
670  PrettyStackTraceProgram X(argc, argv);
671  LLVMContext &Context = getGlobalContext();
672  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
673
674  // Have the command line options parsed and handle things
675  // like --help and --version.
676  cl::ParseCommandLineOptions(argc, argv,
677    "LLVM Archiver (llvm-ar)\n\n"
678    "  This program archives bitcode files into single libraries\n"
679  );
680
681  int exitCode = 0;
682
683  // Do our own parsing of the command line because the CommandLine utility
684  // can't handle the grouped positional parameters without a dash.
685  ArchiveOperation Operation = parseCommandLine();
686
687  // Check the path name of the archive
688  sys::Path ArchivePath;
689  if (!ArchivePath.set(ArchiveName)) {
690    errs() << argv[0] << ": Archive name invalid: " << ArchiveName << "\n";
691    return 1;
692  }
693
694  // Create or open the archive object.
695  bool Exists;
696  if (llvm::sys::fs::exists(ArchivePath.str(), Exists) || !Exists) {
697    // Produce a warning if we should and we're creating the archive
698    if (!Create)
699      errs() << argv[0] << ": creating " << ArchivePath.str() << "\n";
700    TheArchive = Archive::CreateEmpty(ArchivePath, Context);
701    TheArchive->writeToDisk();
702  } else {
703    std::string Error;
704    TheArchive = Archive::OpenAndLoad(ArchivePath, Context, &Error);
705    if (TheArchive == 0) {
706      errs() << argv[0] << ": error loading '" << ArchivePath.str() << "': "
707             << Error << "!\n";
708      return 1;
709    }
710  }
711
712  // Make sure we're not fooling ourselves.
713  assert(TheArchive && "Unable to instantiate the archive");
714
715  // Perform the operation
716  std::string ErrMsg;
717  bool haveError = false;
718  switch (Operation) {
719    case Print:           haveError = doPrint(&ErrMsg); break;
720    case Delete:          haveError = doDelete(&ErrMsg); break;
721    case Move:            haveError = doMove(&ErrMsg); break;
722    case QuickAppend:     haveError = doQuickAppend(&ErrMsg); break;
723    case ReplaceOrInsert: haveError = doReplaceOrInsert(&ErrMsg); break;
724    case DisplayTable:    haveError = doDisplayTable(&ErrMsg); break;
725    case Extract:         haveError = doExtract(&ErrMsg); break;
726    case NoOperation:
727      errs() << argv[0] << ": No operation was selected.\n";
728      break;
729  }
730  if (haveError) {
731    errs() << argv[0] << ": " << ErrMsg << "\n";
732    return 1;
733  }
734
735  delete TheArchive;
736  TheArchive = 0;
737
738  // Return result code back to operating system.
739  return exitCode;
740}
741