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<main role="main">
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<!--Weave of 'Compilation Units' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7</a></li><li><a href="index.html">runtime</a></li><li><a href="index.html#2">Chapter 2: Emission</a></li><li><b>Compilation Units</b></li></ul></div>
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<p class="purpose">To identify which parts of the source text come from which source (the main source text, the Standard Rules, or another extension).</p>
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<ul class="toc"><li><a href="2-cu.html#SP6">§6. Relating to Inter</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Inform is a language in which it is semantically relevant which source file the
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source text is coming from: unlike, say, C, where <span class="extract"><span class="extract-syntax">#include</span></span> allows files to include
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each other in arbitrary ways. In Inform, all source text comes from one of the
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following places:
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</p>
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<ul class="items"><li>(a) The main source text, as shown in the Source panel of the UI app;
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</li><li>(b) An extension file, including the Standard Rules extension;
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</li><li>(c) Invented text created by the compiler itself.
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</li></ul>
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<p class="commentary">The Inter hierarchy also splits, with named units representing each possibility
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in (a) or (b) above. This section of code determines to which unit any new
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definition (of, say, a property or kind) belongs.
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</p>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>We find these by performing a traverse of the parse tree, and looking for
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level-0 headings, which are the nodes from which these blocks of source text hang:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">compilation_unit</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">module_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inter_presence</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">hanging_from</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">compilation_unit</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CompilationUnits::determine</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">SyntaxTree::traverse</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(), </span><a href="2-cu.html#SP2" class="function-link"><span class="function-syntax">CompilationUnits::look_for_cu</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CompilationUnits::look_for_cu</span><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">p</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">Node::get_type</span><span class="plain-syntax">(</span><span class="identifier-syntax">p</span><span class="plain-syntax">) == </span><span class="identifier-syntax">HEADING_NT</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">heading</span><span class="plain-syntax"> *</span><span class="identifier-syntax">h</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Headings::from_node</span><span class="plain-syntax">(</span><span class="identifier-syntax">p</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">h</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">h</span><span class="plain-syntax">-></span><span class="identifier-syntax">level</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">)) </span><a href="2-cu.html#SP2" class="function-link"><span class="function-syntax">CompilationUnits::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">p</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CompilationUnits::log</span><span class="plain-syntax">(</span><span class="reserved-syntax">compilation_unit</span><span class="plain-syntax"> *</span><span class="identifier-syntax">cu</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">cu</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"<null>"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"unit'%W'"</span><span class="plain-syntax">, </span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">cu</span><span class="plain-syntax">-></span><span class="element-syntax">hanging_from</span><span class="plain-syntax">));</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">compilation_unit</span><span class="plain-syntax"> *</span><span class="function-syntax">CompilationUnits::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">source_location</span><span class="plain-syntax"> </span><span class="identifier-syntax">sl</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Wordings::location</span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">from</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">sl</span><span class="plain-syntax">.</span><span class="identifier-syntax">file_of_origin</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">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inform_extension</span><span class="plain-syntax"> *</span><span class="identifier-syntax">owner</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Extensions::corresponding_to</span><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Lexer::file_of_origin</span><span class="plain-syntax">(</span><span class="identifier-syntax">Wordings::first_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">from</span><span class="plain-syntax">))));</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">compilation_unit</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">compilation_unit</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">inter_presence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">hanging_from</span><span class="plain-syntax"> = </span><span class="identifier-syntax">from</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Node::set_unit</span><span class="plain-syntax">(</span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cu.html#SP4" class="function-link"><span class="function-syntax">CompilationUnits::propagate_downwards</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">from</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</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">pname</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-cu.html#SP2_1" class="named-paragraph-link"><span class="named-paragraph">Compose a name for the unit package this will lead to</span><span class="named-paragraph-number">2.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">inter_presence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Packaging::get_unit</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">pname</span><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">pname</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">owner</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="2-hrr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::markup</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">inter_presence</span><span class="plain-syntax">-></span><span class="identifier-syntax">the_package</span><span class="plain-syntax">, </span><span class="constant-syntax">EXT_AUTHOR_HMD</span><span class="plain-syntax">, </span><span class="identifier-syntax">owner</span><span class="plain-syntax">-></span><span class="identifier-syntax">as_copy</span><span class="plain-syntax">-></span><span class="identifier-syntax">edition</span><span class="plain-syntax">-></span><span class="identifier-syntax">work</span><span class="plain-syntax">-></span><span class="identifier-syntax">raw_author_name</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-hrr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::markup</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">inter_presence</span><span class="plain-syntax">-></span><span class="identifier-syntax">the_package</span><span class="plain-syntax">, </span><span class="constant-syntax">EXT_TITLE_HMD</span><span class="plain-syntax">, </span><span class="identifier-syntax">owner</span><span class="plain-syntax">-></span><span class="identifier-syntax">as_copy</span><span class="plain-syntax">-></span><span class="identifier-syntax">edition</span><span class="plain-syntax">-></span><span class="identifier-syntax">work</span><span class="plain-syntax">-></span><span class="identifier-syntax">raw_title</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">V</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">N</span><span class="plain-syntax"> = </span><span class="identifier-syntax">owner</span><span class="plain-syntax">-></span><span class="identifier-syntax">as_copy</span><span class="plain-syntax">-></span><span class="identifier-syntax">edition</span><span class="plain-syntax">-></span><span class="identifier-syntax">version</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">V</span><span class="plain-syntax">, </span><span class="string-syntax">"%v"</span><span class="plain-syntax">, &</span><span class="identifier-syntax">N</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-hrr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::markup</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">-></span><span class="element-syntax">inter_presence</span><span class="plain-syntax">-></span><span class="identifier-syntax">the_package</span><span class="plain-syntax">, </span><span class="constant-syntax">EXT_VERSION_HMD</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">DISCARD_TEXT</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>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">C</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<ul class="endnotetexts"><li>The structure compilation_unit is private to this section.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2_1" class="paragraph-anchor"></a><b>§2.1. </b>Here we must find a unique name, valid as an Inter identifier: the code
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compiled from the compilation unit will go into a package of that name.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Compose a name for the unit package this will lead to</span><span class="named-paragraph-number">2.1</span></span><span class="comment-syntax"> =</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Extensions::is_standard</span><span class="plain-syntax">(</span><span class="identifier-syntax">owner</span><span class="plain-syntax">)) </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">pname</span><span class="plain-syntax">, </span><span class="string-syntax">"standard_rules"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">owner</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">pname</span><span class="plain-syntax">, </span><span class="string-syntax">"source_text"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</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">pname</span><span class="plain-syntax">, </span><span class="string-syntax">"%X"</span><span class="plain-syntax">, </span><span class="identifier-syntax">owner</span><span class="plain-syntax">-></span><span class="identifier-syntax">as_copy</span><span class="plain-syntax">-></span><span class="identifier-syntax">edition</span><span class="plain-syntax">-></span><span class="identifier-syntax">work</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="identifier-syntax">pname</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">Str::get</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">) == </span><span class="character-syntax">' '</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Str::put</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="character-syntax">'_'</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Str::put</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="identifier-syntax">Characters::tolower</span><span class="plain-syntax">(</span><span class="identifier-syntax">Str::get</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">)));</span>
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<span class="plain-syntax"> }</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="2-cu.html#SP2">§2</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>We are eventually going to need to be able to look at a given node in the parse
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tree and say which compilation unit it belongs to. If there were a fast way
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to go up in the tree, that would be easy — we could simply run upward until we
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reach a level-0 heading. But the node links all run downwards. Instead, we'll
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"mark" nodes in the tree, annotating them with the compilation unit which owns
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them. This is done by "propagating downwards", as follows.
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</p>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CompilationUnits::propagate_downwards</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">CompilationUnits::propagate_downwards</span></span>:<br/><a href="2-cu.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="reserved-syntax">compilation_unit</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Node::set_unit</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cu.html#SP4" class="function-link"><span class="function-syntax">CompilationUnits::propagate_downwards</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="element-syntax">down</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">next</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CompilationUnits::assign_to_same_unit</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">CompilationUnits::assign_to_same_unit</span></span>:<br/>Text Substitutions - <a href="4-ts.html#SP11_1">§11.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">to</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Node::set_unit</span><span class="plain-syntax">(</span><span class="identifier-syntax">to</span><span class="plain-syntax">, </span><span class="identifier-syntax">Node::get_unit</span><span class="plain-syntax">(</span><span class="identifier-syntax">from</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="SP5" class="paragraph-anchor"></a><b>§5. </b>As promised, then, given a parse node, we have to return its compilation unit:
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but that's now easy, as we just have to read off the annotation made above —
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">compilation_unit</span><span class="plain-syntax"> *</span><span class="function-syntax">CompilationUnits::find</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">CompilationUnits::find</span></span>:<br/>Hierarchy - <a href="2-hrr.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</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">from</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">NULL</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">Node::get_unit</span><span class="plain-syntax">(</span><span class="identifier-syntax">from</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="SP6" class="paragraph-anchor"></a><b>§6. Relating to Inter. </b>Creating the necessary package, of type <span class="extract"><span class="extract-syntax">_module</span></span>, is the work of the
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Packaging code.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">module_package</span><span class="plain-syntax"> *</span><span class="function-syntax">CompilationUnits::inter_presence</span><span class="plain-syntax">(</span><span class="reserved-syntax">compilation_unit</span><span class="plain-syntax"> *</span><span class="identifier-syntax">C</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">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no unit"</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">C</span><span class="plain-syntax">-></span><span class="element-syntax">inter_presence</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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