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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/4555/">https://reviewboard.asterisk.org/r/4555/</a>
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<p style="margin-top: 0;">On April 1st, 2015, 1:21 a.m. CEST, <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/4555/diff/5/?file=73346#file73346line492" style="color: black; font-weight: bold; text-decoration: underline;">/branches/13/main/utils.c</a>
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(Diff revision 5)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">char *ast_escape_quoted(const char *string, char *outbuf, int buflen)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">string</span> <span class="o">==</span> <span class="nb">NULL</span> <span class="o">||</span> <span class="n">outbuf</span> <span class="o">==</span> <span class="nb">NULL</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">string</span> <span class="o">==</span> <span class="nb">NULL</span> <span class="o">||</span> <span class="n"><span class="hl">buflen</span></span><span class="hl"> </span><span class="o"><span class="hl">==</span></span><span class="hl"> </span><span class="mi"><span class="hl">0</span></span><span class="hl"> </span><span class="o"><span class="hl">||</span></span><span class="hl"> </span><span class="n">outbuf</span> <span class="o">==</span> <span class="nb">NULL</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">ast_assert</span><span class="p">(</span><span class="n">string</span> <span class="o">!=</span> <span class="nb">NULL</span> <span class="o">&&</span> <span class="n">outbuf</span> <span class="o">!=</span> <span class="nb">NULL</span><span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">ast_assert</span><span class="p">(</span><span class="n">string</span> <span class="o">!=</span> <span class="nb">NULL</span> <span class="o">&&</span> <span class="p"><span class="hl">(</span></span><span class="n"><span class="hl">buflen</span></span><span class="hl"> </span><span class="o"><span class="hl">==</span></span><span class="hl"> </span><span class="mi"><span class="hl">0</span></span><span class="hl"> </span><span class="o"><span class="hl">||</span></span><span class="hl"> </span><span class="n">outbuf</span> <span class="o">!=</span> <span class="nb">NULL</span><span class="p">)<span class="hl">)</span>;</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Revert this. This change could affect the callers of the function since you are changing the API. However, no callers currently care about the return value.
You changed this because clang had a problem in test_semi1() in tests/test_strings.c. There is a better way.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Actually as i tried to mention in the description i changed this according to the tests being run. I was not sure which one is supposed to be leading, the test or the source.
The test says it expects:
test_semi(";", "", 0)
To be legal. FOr it to be legal ast_alloca(0) must be allowed.
Am i really changing the API here ?</pre>
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<p style="margin-top: 0;">On April 1st, 2015, 1:21 a.m. CEST, <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/4555/diff/5/?file=73351#file73351line393" style="color: black; font-weight: bold; text-decoration: underline;">/branches/13/tests/test_strings.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">AST_TEST_DEFINE(strsep_test)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">test_len</span> <span class="o">>=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="kt">char</span> <span class="o">*</span><span class="n">ret</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Revert this.</pre>
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<p style="margin-top: 0;">On April 1st, 2015, 1:21 a.m. CEST, <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/4555/diff/5/?file=73351#file73351line395" style="color: black; font-weight: bold; text-decoration: underline;">/branches/13/tests/test_strings.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">AST_TEST_DEFINE(strsep_test)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="cm">/* The clang compiler blows up when running ast_alloca(0) -> __builtin_alloca(0)</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span>possible solutions:</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Is clang returning a NULL pointer when passed a zero length? If so this could be a problem througout the codebase since the code assumes that the function can never fail.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I am not sure what happens, the compiler actually segfaults when it encountered this one. I was a little shocked about it as well. I guess the __builtins are a little more scary. If you wanna find out, give it a try. I think this should at least be reported to the llvm/clang team.
I am not sure how to interpret alloca(0) either... What is the developer trying to achieve here. And what should it return. It can't allocate space of 0 length and return a pointer to it.
A simple but ugly temp-fix would be to change
#define ast_alloca(size) __builtin_alloca(size)
to:
#if defined(__clang)
#define ast_alloca(size) __builtin_alloca(size ? size : 1);
#else
#define ast_alloca(size) __builtin_alloca(size)
#endif</pre>
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<p style="margin-top: 0;">On April 1st, 2015, 1:21 a.m. CEST, <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/4555/diff/5/?file=73351#file73351line399" style="color: black; font-weight: bold; text-decoration: underline;">/branches/13/tests/test_strings.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">AST_TEST_DEFINE(strsep_test)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"><span class="tb"> </span> - adapt ast_stralloca to always allocate with at least size 1 (ugly hack)</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Did you mean ast_alloca() or ast_strdupa()?</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Ooh sorry i meant ast_alloca... Typo.</pre>
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<p style="margin-top: 0;">On April 1st, 2015, 1:21 a.m. CEST, <b>rmudgett</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/4555/diff/5/?file=73351#file73351line407" style="color: black; font-weight: bold; text-decoration: underline;">/branches/13/tests/test_strings.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">AST_TEST_DEFINE(strsep_test)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">test2</span> <span class="o">!=</span> <span class="nb">NULL</span> <span class="o">&&</span> <span class="n">strcmp</span><span class="p">(</span><span class="n">string2</span><span class="p">,</span> <span class="n">test2</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="cm">/* ret == NULL is a valid return when buflen==0, based on a change in main/utils.c */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="n">ret</span> <span class="o">=</span> <span class="n">ast_escape_semicolons</span><span class="p">(</span><span class="n">string1</span><span class="p">,</span> <span class="n">test2</span><span class="p">,</span> <span class="n">test_len</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">ret</span> <span class="o">==</span> <span class="nb">NULL</span> <span class="o">||</span> <span class="p">(</span><span class="n">test2</span> <span class="o">!=</span> <span class="nb">NULL</span> <span class="o">&&</span> <span class="n">strcmp</span><span class="p">(</span><span class="n">string2</span><span class="p">,</span> <span class="n">test2</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Revert now that the clang ast_alloca() problem is worked around.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">ast_alloca problem remain, but is not specifically related to this issue.</pre>
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<p>- Diederik</p>
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<p>On April 1st, 2015, 3:30 a.m. CEST, Diederik de Groot wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Diederik de Groot.</div>
<p style="color: grey;"><i>Updated April 1, 2015, 3:30 a.m.</i></p>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-24917">ASTERISK-24917</a>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">clang's static analyzer will throw quite a number warnings / errors during compilation, some of which can be very helpfull in finding corner-case bugs.
fixes for tests to be compiled using clang</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">executing the tests one-by-one works fine (completes to end) (skipping /main/stdtime) ->
test show results failed:
=================== /main/message/ ======
FAIL test_message_queue_handler_nom /main/message/ 31036ms
[test_message.c:int handler_wait_for_message(struct ast_test *):244]: Test timed out while waiting for handler to get message
Not sure if this is actually a fail or just a timeout. WIP
=================== /main/strings/ ======
FAIL escape_semicolons /main/strings/ 1ms
[Mar 29 20:13:43] ERROR[2521]: utils.c:493 char *ast_escape_semicolons(const char *, char *, int): FRACK!, Failed assertion string != NULL && outbuf != NULL (0)
-> explainable by the change made to the source. ast_alloca(0) is not being executed -> test2 = NULL: need to resolv the open question how to handle ast_alloca(0) before making any further changes.
(With revision 5 of this code, this test now passes without a problem, had to fix both the test and the function being tested though)
=================== /main/stdtime ======
"test execute all" fails, caused by the /main/stdtime/ test.
START /main/stdtime/ - timezone_watch
[test_time.c:enum ast_test_result_state test_timezone_watch(struct ast_test_info *, enum ast_test_command, struct ast_test *):84]: Executing deletion test...
j62747*CLI>
CLI becomes unresponsive / no further command completion for example.
Guess this will need a little further investigation. Maybe the source changes made to main/stdtime/ where not completely correct.
Seems to be caused by inotify_daemon, at least there is where the segfault happens. WIP</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/13/tests/test_strings.c <span style="color: grey">(433444)</span></li>
<li>/branches/13/tests/test_stringfields.c <span style="color: grey">(433444)</span></li>
<li>/branches/13/tests/test_sched.c <span style="color: grey">(433444)</span></li>
<li>/branches/13/tests/test_acl.c <span style="color: grey">(433444)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/4555/diff/" style="margin-left: 3em;">View Diff</a></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">File Attachments </h1>
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<li><a href="https://reviewboard.asterisk.org/media/uploaded/files/2015/03/29/4a17471b-4952-43cd-b015-92d00da2338b__tests.xml">tests results xml (except /main/stdtime)</a></li>
</ul>
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