libbacktrace/btest.c

   1 /* btest.c -- Test for libbacktrace library
   2    Copyright (C) 2012-2021 Free Software Foundation, Inc.
   3    Written by Ian Lance Taylor, Google.
   4
   5 Redistribution and use in source and binary forms, with or without
   6 modification, are permitted provided that the following conditions are
   7 met:
   8
   9     (1) Redistributions of source code must retain the above copyright
  10     notice, this list of conditions and the following disclaimer.
  11
  12     (2) Redistributions in binary form must reproduce the above copyright
  13     notice, this list of conditions and the following disclaimer in
  14     the documentation and/or other materials provided with the
  15     distribution.
  16
  17     (3) The name of the author may not be used to
  18     endorse or promote products derived from this software without
  19     specific prior written permission.
  20
  21 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  23 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  24 DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  25 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  26 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  27 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  29 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  30 IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31 POSSIBILITY OF SUCH DAMAGE.  */
  32
  33 /* This program tests the externally visible interfaces of the
  34    libbacktrace library.  */
  35
  36 #include <assert.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41 #include <sys/stat.h>
  42
  43 #include "filenames.h"
  44
  45 #include "backtrace.h"
  46 #include "backtrace-supported.h"
  47
  48 #include "testlib.h"
  49
  50 /* Test the backtrace function with non-inlined functions.  */
  51
  52 static int test1 (void) __attribute__ ((noinline, noclone, unused));
  53 static int f2 (int) __attribute__ ((noinline, noclone));
  54 static int f3 (int, int) __attribute__ ((noinline, noclone));
  55
  56 static int
  57 test1 (void)
  58 {
  59   /* Returning a value here and elsewhere avoids a tailcall which
  60      would mess up the backtrace.  */
  61   return f2 (__LINE__) + 1;
  62 }
  63
  64 static int
  65 f2 (int f1line)
  66 {
  67   return f3 (f1line, __LINE__) + 2;
  68 }
  69
  70 static int
  71 f3 (int f1line, int f2line)
  72 {
  73   struct info all[20];
  74   struct bdata data;
  75   int f3line;
  76   int i;
  77
  78   data.all = &all[0];
  79   data.index = 0;
  80   data.max = 20;
  81   data.failed = 0;
  82
  83   f3line = __LINE__ + 1;
  84   i = backtrace_full (state, 0, callback_one, error_callback_one, &data);
  85
  86   if (i != 0)
  87     {
  88       fprintf (stderr, "test1: unexpected return value %d\n", i);
  89       data.failed = 1;
  90     }
  91
  92   if (data.index < 3)
  93     {
  94       fprintf (stderr,
  95                "test1: not enough frames; got %zu, expected at least 3\n",
  96                data.index);
  97       data.failed = 1;
  98     }
  99
 100   check ("test1", 0, all, f3line, "f3", "btest.c", &data.failed);
 101   check ("test1", 1, all, f2line, "f2", "btest.c", &data.failed);
 102   check ("test1", 2, all, f1line, "test1", "btest.c", &data.failed);
 103
 104   printf ("%s: backtrace_full noinline\n", data.failed ? "FAIL" : "PASS");
 105
 106   if (data.failed)
 107     ++failures;
 108
 109   return failures;
 110 }
 111
 112 /* Test the backtrace function with inlined functions.  */
 113
 114 static inline int test2 (void) __attribute__ ((always_inline, unused));
 115 static inline int f12 (int) __attribute__ ((always_inline));
 116 static inline int f13 (int, int) __attribute__ ((always_inline));
 117
 118 static inline int
 119 test2 (void)
 120 {
 121   return f12 (__LINE__) + 1;
 122 }
 123
 124 static inline int
 125 f12 (int f1line)
 126 {
 127   return f13 (f1line, __LINE__) + 2;
 128 }
 129
 130 static inline int
 131 f13 (int f1line, int f2line)
 132 {
 133   struct info all[20];
 134   struct bdata data;
 135   int f3line;
 136   int i;
 137
 138   data.all = &all[0];
 139   data.index = 0;
 140   data.max = 20;
 141   data.failed = 0;
 142
 143   f3line = __LINE__ + 1;
 144   i = backtrace_full (state, 0, callback_one, error_callback_one, &data);
 145
 146   if (i != 0)
 147     {
 148       fprintf (stderr, "test2: unexpected return value %d\n", i);
 149       data.failed = 1;
 150     }
 151
 152   check ("test2", 0, all, f3line, "f13", "btest.c", &data.failed);
 153   check ("test2", 1, all, f2line, "f12", "btest.c", &data.failed);
 154   check ("test2", 2, all, f1line, "test2", "btest.c", &data.failed);
 155
 156   printf ("%s: backtrace_full inline\n", data.failed ? "FAIL" : "PASS");
 157
 158   if (data.failed)
 159     ++failures;
 160
 161   return failures;
 162 }
 163
 164 /* Test the backtrace_simple function with non-inlined functions.  */
 165
 166 static int test3 (void) __attribute__ ((noinline, noclone, unused));
 167 static int f22 (int) __attribute__ ((noinline, noclone));
 168 static int f23 (int, int) __attribute__ ((noinline, noclone));
 169
 170 static int
 171 test3 (void)
 172 {
 173   return f22 (__LINE__) + 1;
 174 }
 175
 176 static int
 177 f22 (int f1line)
 178 {
 179   return f23 (f1line, __LINE__) + 2;
 180 }
 181
 182 static int
 183 f23 (int f1line, int f2line)
 184 {
 185   uintptr_t addrs[20];
 186   struct sdata data;
 187   int f3line;
 188   int i;
 189
 190   data.addrs = &addrs[0];
 191   data.index = 0;
 192   data.max = 20;
 193   data.failed = 0;
 194
 195   f3line = __LINE__ + 1;
 196   i = backtrace_simple (state, 0, callback_two, error_callback_two, &data);
 197
 198   if (i != 0)
 199     {
 200       fprintf (stderr, "test3: unexpected return value %d\n", i);
 201       data.failed = 1;
 202     }
 203
 204   if (!data.failed)
 205     {
 206       struct info all[20];
 207       struct bdata bdata;
 208       int j;
 209
 210       bdata.all = &all[0];
 211       bdata.index = 0;
 212       bdata.max = 20;
 213       bdata.failed = 0;
 214
 215       for (j = 0; j < 3; ++j)
 216         {
 217           i = backtrace_pcinfo (state, addrs[j], callback_one,
 218                                 error_callback_one, &bdata);
 219           if (i != 0)
 220             {
 221               fprintf (stderr,
 222                        ("test3: unexpected return value "
 223                         "from backtrace_pcinfo %d\n"),
 224                        i);
 225               bdata.failed = 1;
 226             }
 227           if (!bdata.failed && bdata.index != (size_t) (j + 1))
 228             {
 229               fprintf (stderr,
 230                        ("wrong number of calls from backtrace_pcinfo "
 231                         "got %u expected %d\n"),
 232                        (unsigned int) bdata.index, j + 1);
 233               bdata.failed = 1;
 234             }
 235         }
 236
 237       check ("test3", 0, all, f3line, "f23", "btest.c", &bdata.failed);
 238       check ("test3", 1, all, f2line, "f22", "btest.c", &bdata.failed);
 239       check ("test3", 2, all, f1line, "test3", "btest.c", &bdata.failed);
 240
 241       if (bdata.failed)
 242         data.failed = 1;
 243
 244       for (j = 0; j < 3; ++j)
 245         {
 246           struct symdata symdata;
 247
 248           symdata.name = NULL;
 249           symdata.val = 0;
 250           symdata.size = 0;
 251           symdata.failed = 0;
 252
 253           i = backtrace_syminfo (state, addrs[j], callback_three,
 254                                  error_callback_three, &symdata);
 255           if (i == 0)
 256             {
 257               fprintf (stderr,
 258                        ("test3: [%d]: unexpected return value "
 259                         "from backtrace_syminfo %d\n"),
 260                        j, i);
 261               symdata.failed = 1;
 262             }
 263
 264           if (!symdata.failed)
 265             {
 266               const char *expected;
 267
 268               switch (j)
 269                 {
 270                 case 0:
 271                   expected = "f23";
 272                   break;
 273                 case 1:
 274                   expected = "f22";
 275                   break;
 276                 case 2:
 277                   expected = "test3";
 278                   break;
 279                 default:
 280                   assert (0);
 281                 }
 282
 283               if (symdata.name == NULL)
 284                 {
 285                   fprintf (stderr, "test3: [%d]: NULL syminfo name\n", j);
 286                   symdata.failed = 1;
 287                 }
 288               /* Use strncmp, not strcmp, because GCC might create a
 289                  clone.  */
 290               else if (strncmp (symdata.name, expected, strlen (expected))
 291                        != 0)
 292                 {
 293                   fprintf (stderr,
 294                            ("test3: [%d]: unexpected syminfo name "
 295                             "got %s expected %s\n"),
 296                            j, symdata.name, expected);
 297                   symdata.failed = 1;
 298                 }
 299             }
 300
 301           if (symdata.failed)
 302             data.failed = 1;
 303         }
 304     }
 305
 306   printf ("%s: backtrace_simple noinline\n", data.failed ? "FAIL" : "PASS");
 307
 308   if (data.failed)
 309     ++failures;
 310
 311   return failures;
 312 }
 313
 314 /* Test the backtrace_simple function with inlined functions.  */
 315
 316 static inline int test4 (void) __attribute__ ((always_inline, unused));
 317 static inline int f32 (int) __attribute__ ((always_inline));
 318 static inline int f33 (int, int) __attribute__ ((always_inline));
 319
 320 static inline int
 321 test4 (void)
 322 {
 323   return f32 (__LINE__) + 1;
 324 }
 325
 326 static inline int
 327 f32 (int f1line)
 328 {
 329   return f33 (f1line, __LINE__) + 2;
 330 }
 331
 332 static inline int
 333 f33 (int f1line, int f2line)
 334 {
 335   uintptr_t addrs[20];
 336   struct sdata data;
 337   int f3line;
 338   int i;
 339
 340   data.addrs = &addrs[0];
 341   data.index = 0;
 342   data.max = 20;
 343   data.failed = 0;
 344
 345   f3line = __LINE__ + 1;
 346   i = backtrace_simple (state, 0, callback_two, error_callback_two, &data);
 347
 348   if (i != 0)
 349     {
 350       fprintf (stderr, "test3: unexpected return value %d\n", i);
 351       data.failed = 1;
 352     }
 353
 354   if (!data.failed)
 355     {
 356       struct info all[20];
 357       struct bdata bdata;
 358
 359       bdata.all = &all[0];
 360       bdata.index = 0;
 361       bdata.max = 20;
 362       bdata.failed = 0;
 363
 364       i = backtrace_pcinfo (state, addrs[0], callback_one, error_callback_one,
 365                             &bdata);
 366       if (i != 0)
 367         {
 368           fprintf (stderr,
 369                    ("test4: unexpected return value "
 370                     "from backtrace_pcinfo %d\n"),
 371                    i);
 372           bdata.failed = 1;
 373         }
 374
 375       check ("test4", 0, all, f3line, "f33", "btest.c", &bdata.failed);
 376       check ("test4", 1, all, f2line, "f32", "btest.c", &bdata.failed);
 377       check ("test4", 2, all, f1line, "test4", "btest.c", &bdata.failed);
 378
 379       if (bdata.failed)
 380         data.failed = 1;
 381     }
 382
 383   printf ("%s: backtrace_simple inline\n", data.failed ? "FAIL" : "PASS");
 384
 385   if (data.failed)
 386     ++failures;
 387
 388   return failures;
 389 }
 390
 391 static int test5 (void) __attribute__ ((unused));
 392
 393 int global = 1;
 394
 395 static int
 396 test5 (void)
 397 {
 398   struct symdata symdata;
 399   int i;
 400   uintptr_t addr = (uintptr_t) &global;
 401
 402   if (sizeof (global) > 1)
 403     addr += 1;
 404
 405   symdata.name = NULL;
 406   symdata.val = 0;
 407   symdata.size = 0;
 408   symdata.failed = 0;
 409
 410   i = backtrace_syminfo (state, addr, callback_three,
 411                          error_callback_three, &symdata);
 412   if (i == 0)
 413     {
 414       fprintf (stderr,
 415                "test5: unexpected return value from backtrace_syminfo %d\n",
 416                i);
 417       symdata.failed = 1;
 418     }
 419
 420   if (!symdata.failed)
 421     {
 422       if (symdata.name == NULL)
 423         {
 424           fprintf (stderr, "test5: NULL syminfo name\n");
 425           symdata.failed = 1;
 426         }
 427       else if (!(strncmp (symdata.name, "global", 6) == 0
 428                  && (symdata.name[6] == '\0'|| symdata.name[6] == '.')))
 429         {
 430           fprintf (stderr,
 431                    "test5: unexpected syminfo name got %s expected %s\n",
 432                    symdata.name, "global");
 433           symdata.failed = 1;
 434         }
 435       else if (symdata.val != (uintptr_t) &global)
 436         {
 437           fprintf (stderr,
 438                    "test5: unexpected syminfo value got %lx expected %lx\n",
 439                    (unsigned long) symdata.val,
 440                    (unsigned long) (uintptr_t) &global);
 441           symdata.failed = 1;
 442         }
 443       else if (symdata.size != sizeof (global))
 444         {
 445           fprintf (stderr,
 446                    "test5: unexpected syminfo size got %lx expected %lx\n",
 447                    (unsigned long) symdata.size,
 448                    (unsigned long) sizeof (global));
 449           symdata.failed = 1;
 450         }
 451     }
 452
 453   printf ("%s: backtrace_syminfo variable\n",
 454           symdata.failed ? "FAIL" : "PASS");
 455
 456   if (symdata.failed)
 457     ++failures;
 458
 459   return failures;
 460 }
 461
 462 #define MIN_DESCRIPTOR 3
 463 #define MAX_DESCRIPTOR 10
 464
 465 static int fstat_status[MAX_DESCRIPTOR];
 466
 467 /* Check files that are available.  */
 468
 469 static void
 470 check_available_files (void)
 471 {
 472   struct stat s;
 473   for (unsigned i = MIN_DESCRIPTOR; i < MAX_DESCRIPTOR; i++)
 474     fstat_status[i] = fstat (i, &s);
 475 }
 476
 477 /* Check that are no files left open.  */
 478
 479 static void
 480 check_open_files (void)
 481 {
 482   for (unsigned i = MIN_DESCRIPTOR; i < MAX_DESCRIPTOR; i++)
 483     {
 484       if (fstat_status[i] != 0 && close (i) == 0)
 485         {
 486           fprintf (stderr,
 487                    "ERROR: descriptor %d still open after tests complete\n",
 488                    i);
 489           ++failures;
 490         }
 491     }
 492 }
 493
 494 /* Run all the tests.  */
 495
 496 int
 497 main (int argc ATTRIBUTE_UNUSED, char **argv)
 498 {
 499   check_available_files ();
 500
 501   state = backtrace_create_state (argv[0], BACKTRACE_SUPPORTS_THREADS,
 502                                   error_callback_create, NULL);
 503
 504 #if BACKTRACE_SUPPORTED
 505   test1 ();
 506   test2 ();
 507   test3 ();
 508   test4 ();
 509 #if BACKTRACE_SUPPORTS_DATA
 510   test5 ();
 511 #endif
 512 #endif
 513
 514   check_open_files ();
 515
 516   exit (failures ? EXIT_FAILURE : EXIT_SUCCESS);
 517 }