gcc/selftest.c

   1 /* A self-testing framework, for use by -fself-test.
   2    Copyright (C) 2015-2017 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
  25 #if CHECKING_P
  26
  27 namespace selftest {
  28
  29 int num_passes;
  30
  31 /* Record the successful outcome of some aspect of a test.  */
  32
  33 void
  34 pass (const location &/*loc*/, const char */*msg*/)
  35 {
  36   num_passes++;
  37 }
  38
  39 /* Report the failed outcome of some aspect of a test and abort.  */
  40
  41 void
  42 fail (const location &loc, const char *msg)
  43 {
  44   fprintf (stderr,"%s:%i: %s: FAIL: %s\n", loc.m_file, loc.m_line,
  45            loc.m_function, msg);
  46   abort ();
  47 }
  48
  49 /* As "fail", but using printf-style formatted output.  */
  50
  51 void
  52 fail_formatted (const location &loc, const char *fmt, ...)
  53 {
  54   va_list ap;
  55
  56   fprintf (stderr, "%s:%i: %s: FAIL: ", loc.m_file, loc.m_line,
  57            loc.m_function);
  58   va_start (ap, fmt);
  59   vfprintf (stderr, fmt, ap);
  60   va_end (ap);
  61   fprintf (stderr, "\n");
  62   abort ();
  63 }
  64
  65 /* Implementation detail of ASSERT_STREQ.
  66    Compare val_expected and val_actual with strcmp.  They ought
  67    to be non-NULL; fail gracefully if either are NULL.  */
  68
  69 void
  70 assert_streq (const location &loc,
  71               const char *desc_expected, const char *desc_actual,
  72               const char *val_expected, const char *val_actual)
  73 {
  74   /* If val_expected is NULL, the test is buggy.  Fail gracefully.  */
  75   if (val_expected == NULL)
  76     fail_formatted (loc, "ASSERT_STREQ (%s, %s) expected=NULL",
  77                     desc_expected, desc_actual);
  78   /* If val_actual is NULL, fail with a custom error message.  */
  79   if (val_actual == NULL)
  80     fail_formatted (loc, "ASSERT_STREQ (%s, %s) expected=\"%s\" actual=NULL",
  81                     desc_expected, desc_actual, val_expected);
  82   if (0 == strcmp (val_expected, val_actual))
  83     pass (loc, "ASSERT_STREQ");
  84   else
  85     fail_formatted (loc, "ASSERT_STREQ (%s, %s) expected=\"%s\" actual=\"%s\"",
  86                     desc_expected, desc_actual, val_expected, val_actual);
  87 }
  88
  89 /* Implementation detail of ASSERT_STR_CONTAINS.
  90    Use strstr to determine if val_needle is is within val_haystack.
  91    ::selftest::pass if it is found.
  92    ::selftest::fail if it is not found.  */
  93
  94 void
  95 assert_str_contains (const location &loc,
  96                      const char *desc_haystack,
  97                      const char *desc_needle,
  98                      const char *val_haystack,
  99                      const char *val_needle)
 100 {
 101   /* If val_haystack is NULL, fail with a custom error message.  */
 102   if (val_haystack == NULL)
 103     fail_formatted (loc, "ASSERT_STR_CONTAINS (%s, %s) haystack=NULL",
 104                     desc_haystack, desc_needle);
 105
 106   /* If val_needle is NULL, fail with a custom error message.  */
 107   if (val_needle == NULL)
 108     fail_formatted (loc,
 109                     "ASSERT_STR_CONTAINS (%s, %s) haystack=\"%s\" needle=NULL",
 110                     desc_haystack, desc_needle, val_haystack);
 111
 112   const char *test = strstr (val_haystack, val_needle);
 113   if (test)
 114     pass (loc, "ASSERT_STR_CONTAINS");
 115   else
 116     fail_formatted
 117         (loc, "ASSERT_STR_CONTAINS (%s, %s) haystack=\"%s\" needle=\"%s\"",
 118          desc_haystack, desc_needle, val_haystack, val_needle);
 119 }
 120
 121 /* Constructor.  Generate a name for the file.  */
 122
 123 named_temp_file::named_temp_file (const char *suffix)
 124 {
 125   m_filename = make_temp_file (suffix);
 126   ASSERT_NE (m_filename, NULL);
 127 }
 128
 129 /* Destructor.  Delete the tempfile.  */
 130
 131 named_temp_file::~named_temp_file ()
 132 {
 133   unlink (m_filename);
 134   diagnostics_file_cache_forcibly_evict_file (m_filename);
 135   free (m_filename);
 136 }
 137
 138 /* Constructor.  Create a tempfile using SUFFIX, and write CONTENT to
 139    it.  Abort if anything goes wrong, using LOC as the effective
 140    location in the problem report.  */
 141
 142 temp_source_file::temp_source_file (const location &loc,
 143                                     const char *suffix,
 144                                     const char *content)
 145 : named_temp_file (suffix)
 146 {
 147   FILE *out = fopen (get_filename (), "w");
 148   if (!out)
 149     fail_formatted (loc, "unable to open tempfile: %s", get_filename ());
 150   fprintf (out, "%s", content);
 151   fclose (out);
 152 }
 153
 154 /* Read the contents of PATH into memory, returning a 0-terminated buffer
 155    that must be freed by the caller.
 156    Fail (and abort) if there are any problems, with LOC as the reported
 157    location of the failure.  */
 158
 159 char *
 160 read_file (const location &loc, const char *path)
 161 {
 162   FILE *f_in = fopen (path, "r");
 163   if (!f_in)
 164     fail_formatted (loc, "unable to open file: %s", path);
 165
 166   /* Read content, allocating FIXME.  */
 167   char *result = NULL;
 168   size_t total_sz = 0;
 169   size_t alloc_sz = 0;
 170   char buf[4096];
 171   size_t iter_sz_in;
 172
 173   while ( (iter_sz_in = fread (buf, 1, sizeof (buf), f_in)) )
 174     {
 175       gcc_assert (alloc_sz >= total_sz);
 176       size_t old_total_sz = total_sz;
 177       total_sz += iter_sz_in;
 178       /* Allow 1 extra byte for 0-termination.  */
 179       if (alloc_sz < (total_sz + 1))
 180         {
 181           size_t new_alloc_sz = alloc_sz ? alloc_sz * 2: total_sz + 1;
 182           result = (char *)xrealloc (result, new_alloc_sz);
 183           alloc_sz = new_alloc_sz;
 184         }
 185       memcpy (result + old_total_sz, buf, iter_sz_in);
 186     }
 187
 188   if (!feof (f_in))
 189     fail_formatted (loc, "error reading from %s: %s", path,
 190                     xstrerror (errno));
 191
 192   fclose (f_in);
 193
 194   /* 0-terminate the buffer.  */
 195   gcc_assert (total_sz < alloc_sz);
 196   result[total_sz] = '\0';
 197
 198   return result;
 199 }
 200
 201 /* The path of SRCDIR/testsuite/selftests.  */
 202
 203 const char *path_to_selftest_files = NULL;
 204
 205 /* Convert a path relative to SRCDIR/testsuite/selftests
 206    to a real path (either absolute, or relative to pwd).
 207    The result should be freed by the caller.  */
 208
 209 char *
 210 locate_file (const char *name)
 211 {
 212   ASSERT_NE (NULL, path_to_selftest_files);
 213   return concat (path_to_selftest_files, "/", name, NULL);
 214 }
 215
 216 /* Selftests for libiberty.  */
 217
 218 /* Verify that xstrndup generates EXPECTED when called on SRC and N.  */
 219
 220 static void
 221 assert_xstrndup_eq (const char *expected, const char *src, size_t n)
 222 {
 223   char *buf = xstrndup (src, n);
 224   ASSERT_STREQ (expected, buf);
 225   free (buf);
 226 }
 227
 228 /* Verify that xstrndup works as expected.  */
 229
 230 static void
 231 test_xstrndup ()
 232 {
 233   assert_xstrndup_eq ("", "test", 0);
 234   assert_xstrndup_eq ("t", "test", 1);
 235   assert_xstrndup_eq ("te", "test", 2);
 236   assert_xstrndup_eq ("tes", "test", 3);
 237   assert_xstrndup_eq ("test", "test", 4);
 238   assert_xstrndup_eq ("test", "test", 5);
 239
 240   /* Test on an string without zero termination.  */
 241   const char src[4] = {'t', 'e', 's', 't'};
 242   assert_xstrndup_eq ("", src, 0);
 243   assert_xstrndup_eq ("t", src, 1);
 244   assert_xstrndup_eq ("te", src, 2);
 245   assert_xstrndup_eq ("tes", src, 3);
 246   assert_xstrndup_eq ("test", src, 4);
 247 }
 248
 249 /* Run selftests for libiberty.  */
 250
 251 static void
 252 test_libiberty ()
 253 {
 254   test_xstrndup ();
 255 }
 256
 257 /* Selftests for the selftest system itself.  */
 258
 259 /* Sanity-check the ASSERT_ macros with various passing cases.  */
 260
 261 static void
 262 test_assertions ()
 263 {
 264   ASSERT_TRUE (true);
 265   ASSERT_FALSE (false);
 266   ASSERT_EQ (1, 1);
 267   ASSERT_EQ_AT (SELFTEST_LOCATION, 1, 1);
 268   ASSERT_NE (1, 2);
 269   ASSERT_STREQ ("test", "test");
 270   ASSERT_STREQ_AT (SELFTEST_LOCATION, "test", "test");
 271   ASSERT_STR_CONTAINS ("foo bar baz", "bar");
 272 }
 273
 274 /* Verify named_temp_file.  */
 275
 276 static void
 277 test_named_temp_file ()
 278 {
 279   named_temp_file t (".txt");
 280   FILE *f = fopen (t.get_filename (), "w");
 281   if (!f)
 282     fail_formatted (SELFTEST_LOCATION,
 283                     "unable to open %s for writing", t.get_filename ());
 284   fclose (f);
 285 }
 286
 287 /* Verify read_file (and also temp_source_file).  */
 288
 289 static void
 290 test_read_file ()
 291 {
 292   temp_source_file t (SELFTEST_LOCATION, "test1.s",
 293                       "\tjmp\t.L2\n");
 294   char *buf = read_file (SELFTEST_LOCATION, t.get_filename ());
 295   ASSERT_STREQ ("\tjmp\t.L2\n", buf);
 296   free (buf);
 297 }
 298
 299 /* Verify locate_file (and read_file).  */
 300
 301 static void
 302 test_locate_file ()
 303 {
 304   char *path = locate_file ("example.txt");
 305   char *buf = read_file (SELFTEST_LOCATION, path);
 306   ASSERT_STREQ ("example of a selftest file\n", buf);
 307   free (buf);
 308   free (path);
 309 }
 310
 311 /* Run all of the selftests within this file.  */
 312
 313 void
 314 selftest_c_tests ()
 315 {
 316   test_libiberty ();
 317   test_assertions ();
 318   test_named_temp_file ();
 319   test_read_file ();
 320   test_locate_file ();
 321 }
 322
 323 } // namespace selftest
 324
 325 #endif /* #if CHECKING_P */