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17.13.3 覆盖语句</div>
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To monitor sequences and other behavioral aspects of the design for coverage, the same syntax is used with the cover statement. The tools can gather information about the evaluation and report the results at the end of simulation. When the property for the cover statement is successful, the pass statements can specify a coverage function, such as monitoring all paths for a sequence. The pass statement shall not include any concurrent assert, assume or cover statement. </p>
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Coverage results are divided into two: coverage for properties, coverage for sequences. </p>
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For sequence coverage, the statement appears as: </p><div class="Element170">
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<div class="Element13"><div class="Element12" id="code00751"><pre class="Element12">cover property ( sequence_expr ) statement_or_null</pre></div></div>
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The results of coverage statement for a property shall contain:
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<li class="Element602">Number of times attempted</li>
<li class="Element602">Number of times succeeded</li>
<li class="Element602">Number of times failed</li>
<li class="Element602">Number of times succeeded because of vacuity</li>
</ul>In addition, statement_or_null is executed every time a property succeeds. </p>
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Vacuity rules are applied only when implication operator is used. A property succeeds non-vacuously only if the consequent of the implication contributes to the success. </p>
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Results of coverage for a sequence shall include:
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<li class="Element602">Number of times attempted</li>
<li class="Element602">Number of times matched (each attempt can generate multiple matches)</li>
</ul>In addition, statement_or_null gets executed for every match. If there are multiple matches at the same time, the statement gets executed multiple times, one for each match.</p></div>
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