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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inbuild Modules</a></li><li><a href="index.html">supervisor</a></li><li><a href="index.html#6">Chapter 6: Inform Source Text</a></li><li><b>Virtual Machine Grammar</b></li></ul></div>
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<p class="purpose">Grammar for parsing natural language descriptions of a virtual machine.</p>
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<p class="commentary firstcommentary"><a id="SP1"></a><b>§1. </b>This nonterminal corresponds to the Inbuild version number syntax in the
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arch module: for example, it matches <span class="extract"><span class="extract-syntax">2.7.6</span></span> or <span class="extract"><span class="extract-syntax">3/990505</span></span>.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"><</span><span class="identifier-syntax">version</span><span class="plain-syntax">-</span><span class="identifier-syntax">number</span><span class="plain-syntax">> </span><span class="identifier-syntax">internal</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">vtext</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">vtext</span><span class="plain-syntax">, </span><span class="string-syntax">"%W"</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">semantic_version_number</span><span class="plain-syntax"> </span><span class="identifier-syntax">V</span><span class="plain-syntax"> = </span><span class="identifier-syntax">VersionNumbers::from_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">vtext</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">result</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">VersionNumbers::is_null</span><span class="plain-syntax">(</span><span class="identifier-syntax">V</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">result</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">semantic_version_number_holder</span><span class="plain-syntax"> *</span><span class="identifier-syntax">H</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="identifier-syntax">semantic_version_number_holder</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">H</span><span class="plain-syntax">-></span><span class="identifier-syntax">version</span><span class="plain-syntax"> = </span><span class="identifier-syntax">V</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">void</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">H</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">vtext</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">result</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2"></a><b>§2. </b>The following nonterminal matches any valid description of a virtual machine,
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with result <span class="extract"><span class="extract-syntax">TRUE</span></span> if the current target VM matches that description and
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<span class="extract"><span class="extract-syntax">FALSE</span></span> if not.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"><</span><span class="identifier-syntax">virtual</span><span class="plain-syntax">-</span><span class="identifier-syntax">machine</span><span class="plain-syntax">> </span><span class="identifier-syntax">internal</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">vtext</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">vtext</span><span class="plain-syntax">, </span><span class="string-syntax">"%W"</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">compatibility_specification</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Compatibility::from_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">vtext</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">C</span><span class="plain-syntax">) { *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">C</span><span class="plain-syntax">; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">; }</span>
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<span class="plain-syntax"> *</span><span class="identifier-syntax">XP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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