source: rtems-tools/linkers/main.cpp @ ef4061f

4.104.115
Last change on this file since ef4061f was ef4061f, checked in by Chris Johns <chrisj@…>, on 10/22/12 at 14:10:23

Fix the command line arguments help.
  • Property mode set to 100644
File size: 11.6 KB
Line 
1/*
2 * Copyright (c) 2011-2012, Chris Johns <chrisj@rtems.org>
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16/**
17 * @file
18 *
19 * @ingroup rtems_rld
20 *
21 * @brief RTEMS Linker Main manages opions, sequence of operations and exceptions.
22 *
23 */
24
25#if HAVE_CONFIG_H
26#include "config.h"
27#endif
28
29#include <iostream>
30
31#include <cxxabi.h>
32#include <signal.h>
33#include <stdlib.h>
34#include <string.h>
35#include <unistd.h>
36
37#include <getopt.h>
38
39#include <rld.h>
40#include <rld-cc.h>
41#include <rld-outputter.h>
42#include <rld-process.h>
43#include <rld-resolver.h>
44
45#ifndef HAVE_KILL
46#define kill(p,s) raise(s)
47#endif
48
49/**
50 * RTEMS Linker options. This needs to be rewritten to be like cc where only a
51 * single '-' and long options is present.
52 */
53static struct option rld_opts[] = {
54  { "help",        no_argument,            NULL,           'h' },
55  { "version",     no_argument,            NULL,           'V' },
56  { "verbose",     no_argument,            NULL,           'v' },
57  { "warn",        no_argument,            NULL,           'w' },
58  { "map",         no_argument,            NULL,           'M' },
59  { "output",      required_argument,      NULL,           'o' },
60  { "script",      no_argument,            NULL,           'S' },
61  { "lib-path",    required_argument,      NULL,           'L' },
62  { "lib",         required_argument,      NULL,           'l' },
63  { "no-stdlibs",  no_argument,            NULL,           'n' },
64  { "entry",       required_argument,      NULL,           'e' },
65  { "define",      required_argument,      NULL,           'd' },
66  { "undefined",   required_argument,      NULL,           'u' },
67  { "base",        required_argument,      NULL,           'b' },
68  { "cc",          required_argument,      NULL,           'C' },
69  { "exec-prefix", required_argument,      NULL,           'E' },
70  { "march",       required_argument,      NULL,           'a' },
71  { "mcpu",        required_argument,      NULL,           'c' },
72  { NULL,          0,                      NULL,            0 }
73};
74
75#if TO_BE_USED_FOR_THE_UNDEFINES
76void
77split_on_equals (const std::string& opt, std::string& left, std::string& right)
78{
79  std::string::size_type eq = opt.find_first_of('=');
80}
81#endif
82
83void
84usage (int exit_code)
85{
86  std::cout << "rtems-ld [options] objects" << std::endl
87            << "Options and arguments:" << std::endl
88            << " -h        : help (also --help)" << std::endl
89            << " -V        : print linker version number and exit (also --version)" << std::endl
90            << " -v        : verbose (trace import parts), can be supply multiple times" << std::endl
91            << "             to increase verbosity (also --verbose)" << std::endl
92            << " -w        : generate warnings (also --warn)" << std::endl
93            << " -M        : generate map output (also --map)" << std::endl
94            << " -o file   : linker output is written to file (also --output)" << std::endl
95            << " -S        : linker output is a script file (also --script)" << std::endl
96            << " -L path   : path to a library, add multiple for more than" << std::endl
97            << "             one path (also --lib-path)" << std::endl
98            << " -l lib    : add lib to the libraries searched, add multiple" << std::endl
99            << "             for more than one library (also --lib)" << std::endl
100            << " -n        : do not search standard libraries (also --no-stdlibs)" << std::endl
101            << " -e entry  : entry point symbol (also --entry)" << std::endl
102            << " -d sym    : add the symbol definition, add multiple with" << std::endl
103            << "             more than one define (also --define)" << std::endl
104            << " -u sym    : add the undefined symbol definition, add multiple" << std::endl
105            << "             for more than one undefined symbol (also --undefined)" << std::endl
106            << " -b elf    : read the ELF file symbols as the base RTEMS kernel" << std::endl
107            << "             image (also --base)" << std::endl
108            << " -C file   : execute file as the target C compiler (also --cc)" << std::endl
109            << " -E prefix : the RTEMS tool prefix (also --exec-prefix)" << std::endl
110            << " -a march  : machine architecture (also --march)" << std::endl
111            << " -c cpu    : machine architecture's CPU (also --mcpu)" << std::endl;
112  ::exit (exit_code);
113}
114
115static void
116fatal_signal (int signum)
117{
118  signal (signum, SIG_DFL);
119
120  rld::process::temporaries.clean_up ();
121
122  /*
123   * Get the same signal again, this time not handled, so its normal effect
124   * occurs.
125   */
126  kill (getpid (), signum);
127}
128
129static void
130setup_signals (void)
131{
132  if (signal (SIGINT, SIG_IGN) != SIG_IGN)
133    signal (SIGINT, fatal_signal);
134#ifdef SIGHUP
135  if (signal (SIGHUP, SIG_IGN) != SIG_IGN)
136    signal (SIGHUP, fatal_signal);
137#endif
138  if (signal (SIGTERM, SIG_IGN) != SIG_IGN)
139    signal (SIGTERM, fatal_signal);
140#ifdef SIGPIPE
141  if (signal (SIGPIPE, SIG_IGN) != SIG_IGN)
142    signal (SIGPIPE, fatal_signal);
143#endif
144#ifdef SIGCHLD
145  signal (SIGCHLD, SIG_DFL);
146#endif
147}
148
149int
150main (int argc, char* argv[])
151{
152  int ec = 0;
153
154  setup_signals ();
155
156  try
157  {
158    rld::files::cache   cache;
159    rld::files::cache   base;
160    rld::files::paths   libpaths;
161    rld::files::paths   libs;
162    rld::files::paths   objects;
163    rld::files::paths   libraries;
164    rld::symbols::table base_symbols;
165    rld::symbols::table symbols;
166    rld::symbols::table undefined;
167    std::string         entry;
168    std::string         output = "a.out";
169    std::string         base_name;
170    std::string         cc_name;
171    bool                script = false;
172    bool                standard_libs = true;
173    bool                exec_prefix_set = false;
174    bool                map = false;
175    bool                warnings = false;
176
177    libpaths.push_back (".");
178
179    while (true)
180    {
181      int opt = ::getopt_long (argc, argv, "hvwVMnSb:E:o:L:l:a:c:e:d:u:C:", rld_opts, NULL);
182      if (opt < 0)
183        break;
184
185      switch (opt)
186      {
187        case 'V':
188          std::cout << "rtems-ld (RTEMS Linker) " << rld::version ()
189                    << std::endl;
190          ::exit (0);
191          break;
192
193        case 'v':
194          rld::verbose_inc ();
195          break;
196
197        case 'M':
198          map = true;
199          break;
200
201        case 'w':
202          warnings = true;
203          break;
204
205        case 'o':
206          if (output != "a.out")
207            std::cerr << "warning: output already set" << std::endl;
208          output = optarg;
209          break;
210
211        case 'S':
212          script = true;
213          break;
214
215        case 'l':
216          /*
217           * The order is important. It is the search order.
218           */
219          libs.push_back (optarg);
220          break;
221
222        case 'L':
223          if ((optarg[::strlen (optarg) - 1] == '/') ||
224              (optarg[::strlen (optarg) - 1] == '\\'))
225            optarg[::strlen (optarg) - 1] = '\0';
226          libpaths.push_back (optarg);
227          break;
228
229        case 'n':
230          standard_libs = false;
231          break;
232
233        case 'C':
234          if (exec_prefix_set == true)
235            std::cerr << "warning: exec-prefix ignored when CC provided" << std::endl;
236          rld::cc::cc = optarg;
237          break;
238
239        case 'E':
240          exec_prefix_set = true;
241          rld::cc::exec_prefix = optarg;
242          break;
243
244        case 'a':
245          rld::cc::march = optarg;
246          break;
247
248        case 'c':
249          rld::cc::mcpu = optarg;
250          break;
251
252        case 'e':
253          entry = optarg;
254          break;
255
256        case 'd':
257          symbols[optarg] = rld::symbols::symbol (optarg);
258          break;
259
260        case 'u':
261          undefined[optarg] = rld::symbols::symbol (optarg);
262          break;
263
264        case 'b':
265          base_name = optarg;
266          break;
267
268        case '?':
269          usage (3);
270          break;
271
272        case 'h':
273          usage (0);
274          break;
275      }
276    }
277
278    argc -= optind;
279    argv += optind;
280
281    if (rld::verbose () || map)
282      std::cout << "RTEMS Linker " << rld::version () << std::endl;
283
284    /*
285     * If there are no object files there is nothing to link.
286     */
287    if ((argc == 0) && !map)
288      throw rld::error ("no object files", "options");
289
290    /*
291     * Load the remaining command line arguments into the cache as object
292     * files.
293     */
294    while (argc--)
295      objects.push_back (*argv++);
296
297    /*
298     * Add the object files to the cache.
299     */
300    cache.add (objects);
301
302    /*
303     * Open the cache.
304     */
305    cache.open ();
306
307    /*
308     * If the full path to CC is not provided and the exec-prefix is not set by
309     * the command line see if it can be detected from the object file
310     * types. This must be after we have added the object files because they
311     * are used when detecting.
312     */
313    if (rld::cc::cc.empty () && !exec_prefix_set)
314      rld::cc::exec_prefix = rld::elf::machine_type ();
315
316    /*
317     * If we have a base image add it.
318     */
319    if (base_name.length ())
320    {
321      base.open ();
322      base.add (base_name);
323      base.load_symbols (base_symbols, true);
324    }
325
326    /*
327     * Get the standard library paths
328     */
329    rld::cc::get_standard_libpaths (libpaths);
330
331    /*
332     * Get the command line libraries.
333     */
334    rld::files::find_libraries (libraries, libpaths, libs);
335
336    /*
337     * Are we to load standard libraries ?
338     */
339    if (standard_libs)
340      rld::cc::get_standard_libs (libraries, libpaths);
341
342    /*
343     * Load the library to the cache.
344     */
345    cache.add_libraries (libraries);
346
347    /*
348     * Load the symbol table.
349     */
350    cache.load_symbols (symbols);
351
352    /*
353     * Map ?
354     */
355    if (map)
356    {
357      if (base_name.length ())
358        rld::map (base, base_symbols);
359      rld::map (cache, symbols);
360    }
361
362    if (cache.path_count ())
363    {
364      /*
365       * This structure allows us to add different operations with the same
366       * structure.
367       */
368      rld::files::object_list dependents;
369      rld::resolver::resolve (dependents, cache, base_symbols, symbols, undefined);
370
371      /**
372       * Output the file.
373       */
374      if (script)
375        rld::outputter::script (output, dependents, cache);
376      else
377        rld::outputter::archive (output, dependents, cache);
378
379      /**
380       * Check for warnings.
381       */
382      if (warnings)
383      {
384        rld::warn_unused_externals (dependents);
385      }
386    }
387  }
388  catch (rld::error re)
389  {
390    std::cerr << "error: "
391              << re.where << ": " << re.what
392              << std::endl;
393    ec = 10;
394  }
395  catch (std::exception e)
396  {
397    int   status;
398    char* realname;
399    realname = abi::__cxa_demangle (e.what(), 0, 0, &status);
400    std::cerr << "error: std::exception: " << realname << " [";
401    ::free (realname);
402    const std::type_info &ti = typeid (e);
403    realname = abi::__cxa_demangle (ti.name(), 0, 0, &status);
404    std::cerr << realname << "] " << e.what () << std::endl;
405    ::free (realname);
406    ec = 11;
407  }
408  catch (...)
409  {
410    /*
411     * Helps to know if this happens.
412     */
413    std::cout << "error: unhandled exception" << std::endl;
414    ec = 12;
415  }
416
417  return ec;
418}
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