gcc/selftest.c

   1 /* A self-testing framework, for use by -fself-test.
   2    Copyright (C) 2015-2021 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "selftest.h"
  24 #include "intl.h"
  25
  26 #if CHECKING_P
  27
  28 namespace selftest {
  29
  30 int num_passes;
  31
  32 /* Record the successful outcome of some aspect of a test.  */
  33
  34 void
  35 pass (const location &/*loc*/, const char */*msg*/)
  36 {
  37   num_passes++;
  38 }
  39
  40 /* Report the failed outcome of some aspect of a test and abort.  */
  41
  42 void
  43 fail (const location &loc, const char *msg)
  44 {
  45   fprintf (stderr,"%s:%i: %s: FAIL: %s\n", loc.m_file, loc.m_line,
  46            loc.m_function, msg);
  47   abort ();
  48 }
  49
  50 /* As "fail", but using printf-style formatted output.  */
  51
  52 void
  53 fail_formatted (const location &loc, const char *fmt, ...)
  54 {
  55   va_list ap;
  56
  57   fprintf (stderr, "%s:%i: %s: FAIL: ", loc.m_file, loc.m_line,
  58            loc.m_function);
  59   va_start (ap, fmt);
  60   vfprintf (stderr, fmt, ap);
  61   va_end (ap);
  62   fprintf (stderr, "\n");
  63   abort ();
  64 }
  65
  66 /* Implementation detail of ASSERT_STREQ.
  67    Compare val1 and val2 with strcmp.  They ought
  68    to be non-NULL; fail gracefully if either or both are NULL.  */
  69
  70 void
  71 assert_streq (const location &loc,
  72               const char *desc_val1, const char *desc_val2,
  73               const char *val1, const char *val2)
  74 {
  75   /* If val1 or val2 are NULL, fail with a custom error message.  */
  76   if (val1 == NULL)
  77     if (val2 == NULL)
  78       fail_formatted (loc, "ASSERT_STREQ (%s, %s) val1=NULL val2=NULL",
  79                       desc_val1, desc_val2);
  80     else
  81       fail_formatted (loc, "ASSERT_STREQ (%s, %s) val1=NULL val2=\"%s\"",
  82                       desc_val1, desc_val2, val2);
  83   else
  84     if (val2 == NULL)
  85       fail_formatted (loc, "ASSERT_STREQ (%s, %s) val1=\"%s\" val2=NULL",
  86                       desc_val1, desc_val2, val1);
  87     else
  88       {
  89         if (strcmp (val1, val2) == 0)
  90           pass (loc, "ASSERT_STREQ");
  91         else
  92           fail_formatted (loc, "ASSERT_STREQ (%s, %s) val1=\"%s\" val2=\"%s\"",
  93                           desc_val1, desc_val2, val1, val2);
  94       }
  95 }
  96
  97 /* Implementation detail of ASSERT_STR_CONTAINS.
  98    Use strstr to determine if val_needle is within val_haystack.
  99    ::selftest::pass if it is found.
 100    ::selftest::fail if it is not found.  */
 101
 102 void
 103 assert_str_contains (const location &loc,
 104                      const char *desc_haystack,
 105                      const char *desc_needle,
 106                      const char *val_haystack,
 107                      const char *val_needle)
 108 {
 109   /* If val_haystack is NULL, fail with a custom error message.  */
 110   if (val_haystack == NULL)
 111     fail_formatted (loc, "ASSERT_STR_CONTAINS (%s, %s) haystack=NULL",
 112                     desc_haystack, desc_needle);
 113
 114   /* If val_needle is NULL, fail with a custom error message.  */
 115   if (val_needle == NULL)
 116     fail_formatted (loc,
 117                     "ASSERT_STR_CONTAINS (%s, %s) haystack=\"%s\" needle=NULL",
 118                     desc_haystack, desc_needle, val_haystack);
 119
 120   const char *test = strstr (val_haystack, val_needle);
 121   if (test)
 122     pass (loc, "ASSERT_STR_CONTAINS");
 123   else
 124     fail_formatted
 125         (loc, "ASSERT_STR_CONTAINS (%s, %s) haystack=\"%s\" needle=\"%s\"",
 126          desc_haystack, desc_needle, val_haystack, val_needle);
 127 }
 128
 129 /* Implementation detail of ASSERT_STR_STARTSWITH.
 130    Determine if VAL_STR starts with VAL_PREFIX.
 131    ::selftest::pass if VAL_STR does start with VAL_PREFIX.
 132    ::selftest::fail if it does not, or either is NULL (using
 133    DESC_STR and DESC_PREFIX in the error message).  */
 134
 135 void
 136 assert_str_startswith (const location &loc,
 137                        const char *desc_str,
 138                        const char *desc_prefix,
 139                        const char *val_str,
 140                        const char *val_prefix)
 141 {
 142   /* If val_str is NULL, fail with a custom error message.  */
 143   if (val_str == NULL)
 144     fail_formatted (loc, "ASSERT_STR_STARTSWITH (%s, %s) str=NULL",
 145                     desc_str, desc_prefix);
 146
 147   /* If val_prefix is NULL, fail with a custom error message.  */
 148   if (val_prefix == NULL)
 149     fail_formatted (loc,
 150                     "ASSERT_STR_STARTSWITH (%s, %s) str=\"%s\" prefix=NULL",
 151                     desc_str, desc_prefix, val_str);
 152
 153   if (startswith (val_str, val_prefix))
 154     pass (loc, "ASSERT_STR_STARTSWITH");
 155   else
 156     fail_formatted
 157         (loc, "ASSERT_STR_STARTSWITH (%s, %s) str=\"%s\" prefix=\"%s\"",
 158          desc_str, desc_prefix, val_str, val_prefix);
 159 }
 160
 161
 162 /* Constructor.  Generate a name for the file.  */
 163
 164 named_temp_file::named_temp_file (const char *suffix)
 165 {
 166   m_filename = make_temp_file (suffix);
 167   ASSERT_NE (m_filename, NULL);
 168 }
 169
 170 /* Destructor.  Delete the tempfile.  */
 171
 172 named_temp_file::~named_temp_file ()
 173 {
 174   unlink (m_filename);
 175   diagnostics_file_cache_forcibly_evict_file (m_filename);
 176   free (m_filename);
 177 }
 178
 179 /* Constructor.  Create a tempfile using SUFFIX, and write CONTENT to
 180    it.  Abort if anything goes wrong, using LOC as the effective
 181    location in the problem report.  */
 182
 183 temp_source_file::temp_source_file (const location &loc,
 184                                     const char *suffix,
 185                                     const char *content)
 186 : named_temp_file (suffix)
 187 {
 188   FILE *out = fopen (get_filename (), "w");
 189   if (!out)
 190     fail_formatted (loc, "unable to open tempfile: %s", get_filename ());
 191   fprintf (out, "%s", content);
 192   fclose (out);
 193 }
 194
 195 /* Avoid introducing locale-specific differences in the results
 196    by hardcoding open_quote and close_quote.  */
 197
 198 auto_fix_quotes::auto_fix_quotes ()
 199 {
 200   m_saved_open_quote = open_quote;
 201   m_saved_close_quote = close_quote;
 202   open_quote = "`";
 203   close_quote = "'";
 204 }
 205
 206 /* Restore old values of open_quote and close_quote.  */
 207
 208 auto_fix_quotes::~auto_fix_quotes ()
 209 {
 210   open_quote = m_saved_open_quote;
 211   close_quote = m_saved_close_quote;
 212 }
 213
 214 /* Read the contents of PATH into memory, returning a 0-terminated buffer
 215    that must be freed by the caller.
 216    Fail (and abort) if there are any problems, with LOC as the reported
 217    location of the failure.  */
 218
 219 char *
 220 read_file (const location &loc, const char *path)
 221 {
 222   FILE *f_in = fopen (path, "r");
 223   if (!f_in)
 224     fail_formatted (loc, "unable to open file: %s", path);
 225
 226   /* Read content, allocating FIXME.  */
 227   char *result = NULL;
 228   size_t total_sz = 0;
 229   size_t alloc_sz = 0;
 230   char buf[4096];
 231   size_t iter_sz_in;
 232
 233   while ( (iter_sz_in = fread (buf, 1, sizeof (buf), f_in)) )
 234     {
 235       gcc_assert (alloc_sz >= total_sz);
 236       size_t old_total_sz = total_sz;
 237       total_sz += iter_sz_in;
 238       /* Allow 1 extra byte for 0-termination.  */
 239       if (alloc_sz < (total_sz + 1))
 240         {
 241           size_t new_alloc_sz = alloc_sz ? alloc_sz * 2: total_sz + 1;
 242           result = (char *)xrealloc (result, new_alloc_sz);
 243           alloc_sz = new_alloc_sz;
 244         }
 245       memcpy (result + old_total_sz, buf, iter_sz_in);
 246     }
 247
 248   if (!feof (f_in))
 249     fail_formatted (loc, "error reading from %s: %s", path,
 250                     xstrerror (errno));
 251
 252   fclose (f_in);
 253
 254   /* 0-terminate the buffer.  */
 255   gcc_assert (total_sz < alloc_sz);
 256   result[total_sz] = '\0';
 257
 258   return result;
 259 }
 260
 261 /* The path of SRCDIR/testsuite/selftests.  */
 262
 263 const char *path_to_selftest_files = NULL;
 264
 265 /* Convert a path relative to SRCDIR/testsuite/selftests
 266    to a real path (either absolute, or relative to pwd).
 267    The result should be freed by the caller.  */
 268
 269 char *
 270 locate_file (const char *name)
 271 {
 272   ASSERT_NE (NULL, path_to_selftest_files);
 273   return concat (path_to_selftest_files, "/", name, NULL);
 274 }
 275
 276 /* selftest::test_runner's ctor.  */
 277
 278 test_runner::test_runner (const char *name)
 279 : m_name (name),
 280   m_start_time (get_run_time ())
 281 {
 282 }
 283
 284 /* selftest::test_runner's dtor.  Print a summary line to stderr.  */
 285
 286 test_runner::~test_runner ()
 287 {
 288   /* Finished running tests.  */
 289   long finish_time = get_run_time ();
 290   long elapsed_time = finish_time - m_start_time;
 291
 292   fprintf (stderr,
 293            "%s: %i pass(es) in %ld.%06ld seconds\n",
 294            m_name, num_passes,
 295            elapsed_time / 1000000, elapsed_time % 1000000);
 296 }
 297
 298 /* Selftests for libiberty.  */
 299
 300 /* Verify that xstrndup generates EXPECTED when called on SRC and N.  */
 301
 302 static void
 303 assert_xstrndup_eq (const char *expected, const char *src, size_t n)
 304 {
 305   char *buf = xstrndup (src, n);
 306   ASSERT_STREQ (expected, buf);
 307   free (buf);
 308 }
 309
 310 /* Verify that xstrndup works as expected.  */
 311
 312 static void
 313 test_xstrndup ()
 314 {
 315   assert_xstrndup_eq ("", "test", 0);
 316   assert_xstrndup_eq ("t", "test", 1);
 317   assert_xstrndup_eq ("te", "test", 2);
 318   assert_xstrndup_eq ("tes", "test", 3);
 319   assert_xstrndup_eq ("test", "test", 4);
 320   assert_xstrndup_eq ("test", "test", 5);
 321
 322   /* Test on an string without zero termination.  */
 323   const char src[4] = {'t', 'e', 's', 't'};
 324   assert_xstrndup_eq ("", src, 0);
 325   assert_xstrndup_eq ("t", src, 1);
 326   assert_xstrndup_eq ("te", src, 2);
 327   assert_xstrndup_eq ("tes", src, 3);
 328   assert_xstrndup_eq ("test", src, 4);
 329 }
 330
 331 /* Run selftests for libiberty.  */
 332
 333 static void
 334 test_libiberty ()
 335 {
 336   test_xstrndup ();
 337 }
 338
 339 /* Selftests for the selftest system itself.  */
 340
 341 /* Sanity-check the ASSERT_ macros with various passing cases.  */
 342
 343 static void
 344 test_assertions ()
 345 {
 346   ASSERT_TRUE (true);
 347   ASSERT_FALSE (false);
 348   ASSERT_EQ (1, 1);
 349   ASSERT_EQ_AT (SELFTEST_LOCATION, 1, 1);
 350   ASSERT_NE (1, 2);
 351   ASSERT_GT (2, 1);
 352   ASSERT_GT_AT (SELFTEST_LOCATION, 2, 1);
 353   ASSERT_LT (1, 2);
 354   ASSERT_LT_AT (SELFTEST_LOCATION, 1, 2);
 355   ASSERT_STREQ ("test", "test");
 356   ASSERT_STREQ_AT (SELFTEST_LOCATION, "test", "test");
 357   ASSERT_STR_CONTAINS ("foo bar baz", "bar");
 358 }
 359
 360 /* Verify named_temp_file.  */
 361
 362 static void
 363 test_named_temp_file ()
 364 {
 365   named_temp_file t (".txt");
 366   FILE *f = fopen (t.get_filename (), "w");
 367   if (!f)
 368     fail_formatted (SELFTEST_LOCATION,
 369                     "unable to open %s for writing", t.get_filename ());
 370   fclose (f);
 371 }
 372
 373 /* Verify read_file (and also temp_source_file).  */
 374
 375 static void
 376 test_read_file ()
 377 {
 378   temp_source_file t (SELFTEST_LOCATION, "test1.s",
 379                       "\tjmp\t.L2\n");
 380   char *buf = read_file (SELFTEST_LOCATION, t.get_filename ());
 381   ASSERT_STREQ ("\tjmp\t.L2\n", buf);
 382   free (buf);
 383 }
 384
 385 /* Verify locate_file (and read_file).  */
 386
 387 static void
 388 test_locate_file ()
 389 {
 390   char *path = locate_file ("example.txt");
 391   char *buf = read_file (SELFTEST_LOCATION, path);
 392   ASSERT_STREQ ("example of a selftest file\n", buf);
 393   free (buf);
 394   free (path);
 395 }
 396
 397 /* Run all of the selftests within this file.  */
 398
 399 void
 400 selftest_c_tests ()
 401 {
 402   test_libiberty ();
 403   test_assertions ();
 404   test_named_temp_file ();
 405   test_read_file ();
 406   test_locate_file ();
 407 }
 408
 409 } // namespace selftest
 410
 411 #endif /* #if CHECKING_P */