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<br /><table class="width100" cellspacing="1"><tr><td class="form-title" colspan="6"><div class="center">ETSI's Bug Tracker - Part 01: TTCN-3 Core Language</div></td></tr><tr><td class="form-title" colspan="6">View Issue Details</td></tr><tr><td class="print-spacer" colspan="6"><hr size="1" /></td></tr><tr class="print-category"><td class="print" width="16%">ID</td><td class="print" width="16%">Project</td><td class="print" width="16%">Category</td><td class="print" width="16%">View Status</td><td class="print" width="16%">Date Submitted</td><td class="print" width="16%">Last Update</td></tr><tr class="print"><td class="print">0005587</td><td class="print">Part 01: TTCN-3 Core Language</td><td class="print">Clarification</td><td class="print">public</td><td class="print">01-07-2010 15:10</td><td class="print">15-12-2010 00:02</td></tr><tr><td class="print-spacer" colspan="6"><hr size="1" /></td></tr><tr class="print"><td class="print-category">Reporter</td><td class="print">Gyorgy Rethy</td><td class="print" colspan="4">&#160;</td></tr><tr class="print"><td class="print-category">Assigned To</td><td class="print">Ina Schieferdecker</td><td class="print" colspan="4">&#160;</td></tr><tr class="print"><td class="print-category">Priority</td><td class="print">normal</td><td class="print-category">Severity</td><td class="print">minor</td><td class="print-category">Reproducibility</td><td class="print">have not tried</td></tr><tr class="print"><td class="print-category">Status</td><td class="print">closed</td><td class="print-category">Resolution</td><td class="print">fixed</td><td class="print" colspan="2">&#160;</td></tr><tr class="print"><td class="print-category">Platform</td><td class="print"></td><td class="print-category">OS</td><td class="print"></td><td class="print-category">OS Version</td><td class="print"></td></tr><tr class="print"><td class="print-category">Product Version</td><td class="print"></td><td class="print" colspan="4">&#160;</td></tr><tr><td class="print-category">Target Version</td><td class="print">v4.3.1 (published 2011-06)</td><td class="print-category">Fixed in Version</td><td class="print">v4.3.1 (published 2011-06)</td><td class="print" colspan="2">&#160;</td></tr><tr class="print"><td class="print-category">Clause Reference(s)</td><td class="print" colspan="4">???</td></tr><tr class="print"><td class="print-category">Source  (company  - Author)</td><td class="print" colspan="4">STF160</td></tr><tr><td class="print-spacer" colspan="6"><hr size="1" /></td></tr><tr class="print"><td class="print-category">Summary</td><td class="print" colspan="5">0005587: Clarification in using functions in special places</td></tr><tr class="print"><td class="print-category">Description</td><td class="print" colspan="5">Dear stf393,<br />
<br />
another question for clarification:<br />
we have several places in our test suite where in a receive event the return value of a function is used as parameter of the receive template,<br />
e.g.<br />
&#160;&#160;&#160;myPCO.receive(cr_Mytemplate(f_MyFunction(), ...))<br />
<br />
Now in some cases f_MyFunction assigns a verdict and kills the PTC.<br />
<br />
Even though this is not explicitly listed in 16.1.4 (or is this considered as a special case of inline template ??) acc. to the philosophy of 16.1.4 I tend to agree that this is not allowed.<br />
Bute there are some thoughts which may be taken into consideration:<br />
- When we have a variable getting assigned the function just before the receive statement and use this variable in the receive statement:<br />
&#160;&#160;&#160;&#160;var MyType v_MyVar := f_MyFunction();<br />
&#160;&#160;&#160;&#160;myPCO.receive(cr_Mytemplate(v_MyVar, ...))<br />
<br />
&#160;&#160;That should work anyway - BUT &quot;normal&quot; programmers may not understand the difference and consider this as equivalent.<br />
<br />
- Regarding the above examples: Is is it clearly specified (e.g. in part 4) at which point in time the function is performed when being parameter in the receive statement ??<br />
<br />
- Currently there is poor support by tools to find this issues; just IBM raises an error<br />
<br />
So as a summary: when there are restrictions on functions being used as parameters in receive statements acc. to 16.1.4 how can we achieve that people don't do it wrong ??<br />
Please note, that this is also an issue of tool compatibility.<br />
<br />
Thanks and regards<br />
Wolfgang<br />
</td></tr><tr class="print"><td class="print-category">Steps To Reproduce</td><td class="print" colspan="5"></td></tr><tr class="print"><td class="print-category">Additional Information</td><td class="print" colspan="5"></td></tr><tr class="print"><td class="print-category">Tags</td><td class="print" colspan="5">No tags attached.</td></tr><tr class="print"><td class="print-category">Relationships</td><td class="print" colspan="5"></td></tr><tr class="print"><td class="print-category">Attached Files</td><td class="print" colspan="5"></td></tr><tr><td class="print-spacer" colspan="6"><hr size="1" /></td></tr><tr><td class="form-title">Issue History</td></tr><tr class="print-category"><td class="row-category-history">Date Modified</td><td class="row-category-history">Username</td><td class="row-category-history">Field</td><td class="row-category-history">Change</td></tr><tr class="print"><td class="print">01-07-2010 15:10</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a></td><td class="print">New Issue</td><td class="print"></td></tr><tr class="print"><td class="print">01-07-2010 15:10</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a></td><td class="print">Clause Reference(s)</td><td class="print"> =&gt; ???</td></tr><tr class="print"><td class="print">01-07-2010 15:10</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a></td><td class="print">Source  (company  - Author)</td><td class="print"> =&gt; STF160</td></tr><tr class="print"><td class="print">01-07-2010 15:12</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a></td><td class="print">Target Version</td><td class="print"> =&gt; Edition 4.3.1 (not yet published)</td></tr><tr class="print"><td class="print">01-07-2010 17:18</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a></td><td class="print">Note Added: 0009457</td><td class="print"></td></tr><tr class="print"><td class="print">01-07-2010 17:19</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a></td><td class="print">Note Edited: 0009457</td><td class="print"></td></tr><tr class="print"><td class="print">01-07-2010 17:20</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a></td><td class="print">Note Edited: 0009457</td><td class="print"></td></tr><tr class="print"><td class="print">30-08-2010 12:17</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a></td><td class="print">Status</td><td class="print">new =&gt; assigned</td></tr><tr class="print"><td class="print">30-08-2010 12:17</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a></td><td class="print">Assigned To</td><td class="print"> =&gt; Jacob Wieland - Spirent</td></tr><tr class="print"><td class="print">30-08-2010 13:55</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Note Added: 0009655</td><td class="print"></td></tr><tr class="print"><td class="print">30-08-2010 17:22</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Note Added: 0009658</td><td class="print"></td></tr><tr class="print"><td class="print">30-08-2010 17:24</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Assigned To</td><td class="print">Jacob Wieland - Spirent =&gt; Gyorgy Rethy</td></tr><tr class="print"><td class="print">01-09-2010 11:15</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=82">Jens Grabowski</a></td><td class="print">Note Added: 0009671</td><td class="print"></td></tr><tr class="print"><td class="print">02-09-2010 09:27</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a></td><td class="print">Assigned To</td><td class="print">Gyorgy Rethy =&gt; Ina Schieferdecker</td></tr><tr class="print"><td class="print">02-09-2010 09:27</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a></td><td class="print">Status</td><td class="print">assigned =&gt; resolved</td></tr><tr class="print"><td class="print">02-09-2010 09:27</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a></td><td class="print">Resolution</td><td class="print">open =&gt; fixed</td></tr><tr class="print"><td class="print">15-12-2010 00:01</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=81">Ina Schieferdecker</a></td><td class="print">Note Added: 0009974</td><td class="print"></td></tr><tr class="print"><td class="print">15-12-2010 00:01</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=81">Ina Schieferdecker</a></td><td class="print">Status</td><td class="print">resolved =&gt; closed</td></tr><tr class="print"><td class="print">15-12-2010 00:02</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=81">Ina Schieferdecker</a></td><td class="print">Fixed in Version</td><td class="print"> =&gt; Edition 4.3.1 (not yet published)</td></tr></table>
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				(0009457)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a>&#160;&#160;&#160;
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				01-07-2010 17:18&#160;&#160;&#160;
				<br />(edited on:&#32;01-07-2010 17:20)			</td>
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				STF discussion result is:<br />
Passing a function as actual parameter to an object used in a receive statement is a use of the function at a special place just like the function was called directly in the receiving statement. Hence restrictions of $16.1.4 apply.<br />
<br />
The STF agreed that the standard should be checked if all and every such cases are handled adequately.<br />
<br />
&quot;Is is it clearly specified (e.g. in part 4) at which point in time the function is performed when being parameter in the receive statement ??&quot; -&gt; it is not defined, as functions called during snapshot evaluation shall not change the snapshot, the exact time of evaluating the functions has no significance. Hence the restrictions of 16.1.4.<br />
<br />
Checking those restrictions statically is not easy (for tool implementations). So, the STF should use the IBM tool for checking the quality of the code.<br />
<br />
Even if &quot;normal&quot; programmers may not understand the difference, the case <br />
&#160;&#160;&#160;&#160;var MyType v_MyVar := f_MyFunction();<br />
&#160;&#160;&#160;&#160;myPCO.receive(cr_Mytemplate(v_MyVar, ...))<br />
essentially differs from calling the function in the receive statement directly. A stand-alone receive is a shorthand for an alt with one receiving branch plus the activated defaults, thus stimulates a snapshot, while during a simple assignment there is no snapshot involved, i.e. no risk of side effects.<br />
<br />
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				(0009655)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a>&#160;&#160;&#160;
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				30-08-2010 13:55&#160;&#160;&#160;
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				The following sentence in section 16.1.4 <br />
<br />
&quot;Value returning functions can be called during communication operations (in templates, template fields or in-line templates)&quot;<br />
<br />
should be changed to<br />
<br />
&quot;Value returning functions can be called during communication operations (in templates, template fields, in-line templates or as actual parameters)&quot;<br />
<br />
This way, all function calls that are used as actual parameters during communication operations must adhere to the non-side-effect restrictions.<br />
<br />
(Actually, I think the already existent restriction 'in templates or in-line templates' already covers this as cr_Mytemplate(f_MyFunction(), ...) is a template and the f_MyFunction() call is part of that template expression, but being a bit more explicit doesn't hurt here, either)			</td>
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				(0009658)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a>&#160;&#160;&#160;
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				30-08-2010 17:22&#160;&#160;&#160;
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				please review			</td>
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				(0009671)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=82">Jens Grabowski</a>&#160;&#160;&#160;
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				01-09-2010 11:15&#160;&#160;&#160;
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				Ok for me.			</td>
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				(0009974)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=81">Ina Schieferdecker</a>&#160;&#160;&#160;
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				15-12-2010 00:01&#160;&#160;&#160;
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				Implemented as proposed.			</td>
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