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<section id="the-regression-test-suite">
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<h1>The Regression Test Suite<a class="headerlink" href="#the-regression-test-suite" title="Link to this heading">¶</a></h1>
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||
<p>Icarus Verilog development includes a regression test suite that is included
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||
along with the source. The “ivtest” directory contains the regression test
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suite, and this suite is used by the github actions as continuous integration
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to make sure the code is always going forward.</p>
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<p>NOTE: There are scripts written in perl to run the regression tests, but they
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are being gradually replaced with a newer set of scripts. It is the newer
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method that is described here.</p>
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<section id="test-descriptions">
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||
<h2>Test Descriptions<a class="headerlink" href="#test-descriptions" title="Link to this heading">¶</a></h2>
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||
<p>Regression tests are listed in the regress-vvp.list file. Each line lists the
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||
name of the test and the path to the dest description. The list file is
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||
therefore pretty simple, and all the description of the test is in the
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||
description file:</p>
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||
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span data-line="1"><span class="go">macro_str_esc vvp_tests/macro_str_esc.json</span>
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||
</span></pre></div>
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||
</div>
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||
<p>The “name” is a simple name, and the test-description-file is the path (relative
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the ivtest directory) to the description file. A simple test description file
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||
is a JSON file, like this:</p>
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||
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span data-line="1"><span class="p">{</span>
|
||
</span><span data-line="2"><span class="w"> </span><span class="s">"type"</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="s">"normal"</span><span class="p">,</span>
|
||
</span><span data-line="3"><span class="w"> </span><span class="s">"source"</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="s">"macro_str_esc.v"</span><span class="p">,</span>
|
||
</span><span data-line="4"><span class="w"> </span><span class="s">"gold"</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="s">"macro_str_esc"</span>
|
||
</span><span data-line="5"><span class="p">}</span>
|
||
</span></pre></div>
|
||
</div>
|
||
<p>This description file contains all the information that the vvp_reg.py script
|
||
needs to run the regression test. The sections below describe the keys and
|
||
values in the description file dictionary.</p>
|
||
<section id="source-required">
|
||
<h3>source (required)<a class="headerlink" href="#source-required" title="Link to this heading">¶</a></h3>
|
||
<p>This specifies the name of the source file. The file is actually to be found
|
||
in the ivltests/ directory.</p>
|
||
</section>
|
||
<section id="type-required">
|
||
<h3>type (required)<a class="headerlink" href="#type-required" title="Link to this heading">¶</a></h3>
|
||
<p>This describes the kind of test to run. The valid values are:</p>
|
||
<ul class="simple">
|
||
<li><p><strong>normal</strong> - Compile the source using the iverilog compiler vvp target, and if
|
||
that succeeds execute it using the vvp command. If there is no gold file
|
||
specified, then look for an output line with the “PASSED” string.</p></li>
|
||
<li><p><strong>NI</strong> - Mark the test as not implemented. The test will be skipped without
|
||
running or reporting an error.</p></li>
|
||
<li><p><strong>CE</strong> - Compile, but expect the compiler to fail. This means the compiler
|
||
command process must return an error exit.</p></li>
|
||
<li><p><strong>EF</strong> - Compile and run, but expect the run time to fail. This means the
|
||
run time program must return an error exit.</p></li>
|
||
<li><p><strong>TE</strong> - This is specific to testing the vlog95 conversion and indicates the
|
||
translated code failed to compile.</p></li>
|
||
</ul>
|
||
</section>
|
||
<section id="gold-optional">
|
||
<h3>gold (optional)<a class="headerlink" href="#gold-optional" title="Link to this heading">¶</a></h3>
|
||
<p>If this is specified, it replaces the “Passed” condition with a comparison of
|
||
the output with a gold file. The argument is the name of the gold file set,
|
||
which will be found in the “gold/” directory. The name here is actually the
|
||
basename of the gold files, with separate actual gold files for the iverilog
|
||
and vvp stderr and stdout. For example, if a “normal” test includes a gold
|
||
file, then the program is compiled and run, and the outputs are compared with
|
||
the gold file to make sure it ran properly.</p>
|
||
<p>The way the regression suite works, there are 4 log files created for each
|
||
test:</p>
|
||
<ul class="simple">
|
||
<li><p>foo-iverilog-stdout.log</p></li>
|
||
<li><p>foo-iverilog-stderr.log</p></li>
|
||
<li><p>foo-vvp-stdout.log</p></li>
|
||
<li><p>foo-vvp-stderr.log</p></li>
|
||
</ul>
|
||
<p>The “gold” value is the name of the gold file set. If the gold value is “foo”,
|
||
Then the actual gold files are called:</p>
|
||
<ul class="simple">
|
||
<li><p>gold/foo-iverilog-stdout.gold</p></li>
|
||
<li><p>gold/foo-iverilog-stderr.gold</p></li>
|
||
<li><p>gold/foo-vvp-stdout.gold</p></li>
|
||
<li><p>gold/foo/vvp-stderr.gold</p></li>
|
||
</ul>
|
||
<p>If any of those files is empty, then the gold file doesn’t need to be
|
||
present at all. The log files and the gold files are compared byte for
|
||
byte, so if the output you are getting is correct, then copy the log to
|
||
the corresponding gold, and you’re done.</p>
|
||
<p>If the run type is “CE” or “RE”, then the gold files still work, and can
|
||
be used to check that the error message is correct. If the gold file setting
|
||
is present, the error return is required, and also the gold files must match.</p>
|
||
</section>
|
||
<section id="iverilog-args-optional">
|
||
<h3>iverilog-args (optional)<a class="headerlink" href="#iverilog-args-optional" title="Link to this heading">¶</a></h3>
|
||
<p>If this is specified, it is a list of strings that are passed as arguments to
|
||
the iverilog command line.</p>
|
||
</section>
|
||
<section id="vvp-args-optional">
|
||
<h3>vvp-args (optional)<a class="headerlink" href="#vvp-args-optional" title="Link to this heading">¶</a></h3>
|
||
<p>If this is specified, it is a list of strings that are passed as arguments to
|
||
the vvp command. These arguments go before the vvp input file that is to be
|
||
run.</p>
|
||
</section>
|
||
<section id="vvp-args-extended-optional">
|
||
<h3>vvp-args-extended (optional)<a class="headerlink" href="#vvp-args-extended-optional" title="Link to this heading">¶</a></h3>
|
||
<p>If this is specified, it is a lost of strings that are passed as arguments to
|
||
the vvp command. These are extended arguments, and are placed after the vvp
|
||
input file that is being run. This is where you place things like plusargs.</p>
|
||
</section>
|
||
<section id="strict-force-sv-or-vlog95-optional">
|
||
<h3>strict, force-sv or vlog95 (optional)<a class="headerlink" href="#strict-force-sv-or-vlog95-optional" title="Link to this heading">¶</a></h3>
|
||
<p>Any of these can be used to create overrides for the type, gold or
|
||
iverilog-args when the given test type is run.</p>
|
||
</section>
|
||
</section>
|
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