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<!--Weave of 'Eliminate Redundant Matter Stage' 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">Inter Modules</a></li><li><a href="index.html">pipeline</a></li><li><a href="index.html#6">Chapter 6: Optimisation</a></li><li><b>Eliminate Redundant Matter Stage</b></li></ul></div>
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<p class="purpose">To remove definitions which are never used: for example, functions which are never called or referred to.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>Experience shows that around 20 per cent of the code generated by <a href="../inform7/index.html" class="internal">inform7</a>
and, especially, <a href="../inter/index.html" class="internal">inter</a> consists of functions which are never in fact needed.
(A kit, of its nature, is a library of code: some will be useful, some not, in
any given circumstance. Many Inform 7 works will never need to sort a table,
for example.)
</p>
<p class="commentary">This stage removes everything that isn't used.
</p>
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<p class="commentary">NB: At present (January 2022) it doesn't work on some test cases, so it's not
included in the standard pipeline.
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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">void</span><span class="plain-syntax"> </span><span class="function-syntax">EliminateRedundantMatterStage::create_pipeline_stage</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">EliminateRedundantMatterStage::create_pipeline_stage</span></span>:<br/>Parsing Pipelines - <a href="2-pp.html#SP10">&#167;10</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="2-pp.html#SP3" class="function-link"><span class="function-syntax">ParsingPipelines::new_stage</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"eliminate-redundant-matter"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><a href="6-erms.html#SP1" class="function-link"><span class="function-syntax">EliminateRedundantMatterStage::run</span></a><span class="plain-syntax">, </span><span class="constant-syntax">NO_STAGE_ARG</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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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">EliminateRedundantMatterStage::run</span><span class="plain-syntax">(</span><span class="reserved-syntax">pipeline_step</span><span class="plain-syntax"> *</span><span class="identifier-syntax">step</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax"> = </span><span class="identifier-syntax">step</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">ephemera</span><span class="plain-syntax">.</span><span class="element-syntax">tree</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">InterTree::traverse</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><a href="6-erms.html#SP2" class="function-link"><span class="function-syntax">EliminateRedundantMatterStage::preserver</span></a><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">PACKAGE_IST</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">InterTree::traverse</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><a href="6-erms.html#SP4" class="function-link"><span class="function-syntax">EliminateRedundantMatterStage::destroyer</span></a><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">PACKAGE_IST</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">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>We operate on a presumption of guilt: any package which we cannot prove is
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needed will be deleted. <span class="extract"><span class="extract-syntax">Main_fn</span></span> is clearly needed, since it is where
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execution will begin. A handful of other functions, not called yet but
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needed in the final compilation stage (and which replace stubs which would
otherwise be provided by the veneer), must also be included. Command
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packages contain grammar for command verbs typed at run-time: these affect
an essential data structure (i.e., the parser grammar) implicitly, and so
we can't detect the dependency here. So we require all command packages to
be included.
</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">EliminateRedundantMatterStage::preserver</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">EliminateRedundantMatterStage::preserver</span></span>:<br/><a href="6-erms.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">state</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">pipeline_step</span><span class="plain-syntax"> *</span><span class="identifier-syntax">step</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">pipeline_step</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">state</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pack</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::at_this_head</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ptype</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::type</span><span class="plain-syntax">(</span><span class="identifier-syntax">pack</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">ptype</span><span class="plain-syntax"> == </span><a href="2-rp.html#SP5" class="function-link"><span class="function-syntax">RunningPipelines::get_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="constant-syntax">command_ptype_RPSYM</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><a href="6-erms.html#SP3" class="function-link"><span class="function-syntax">EliminateRedundantMatterStage::preserve</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"it's a _command package"</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">ptype</span><span class="plain-syntax"> == </span><a href="2-rp.html#SP5" class="function-link"><span class="function-syntax">RunningPipelines::get_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="constant-syntax">property_ptype_RPSYM</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">N</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::name</span><span class="plain-syntax">(</span><span class="identifier-syntax">pack</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::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"workflag_prop"</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><a href="6-erms.html#SP3" class="function-link"><span class="function-syntax">EliminateRedundantMatterStage::preserve</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"it's workflag"</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::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"pluralname_prop"</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><a href="6-erms.html#SP3" class="function-link"><span class="function-syntax">EliminateRedundantMatterStage::preserve</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"it's pluralname"</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::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"ambigpluralname_prop"</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><a href="6-erms.html#SP3" class="function-link"><span class="function-syntax">EliminateRedundantMatterStage::preserve</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"it's ambigpluralname"</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::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"proper_prop"</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><a href="6-erms.html#SP3" class="function-link"><span class="function-syntax">EliminateRedundantMatterStage::preserve</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"it's proper"</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">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ptype</span><span class="plain-syntax"> == </span><a href="2-rp.html#SP5" class="function-link"><span class="function-syntax">RunningPipelines::get_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="constant-syntax">function_ptype_RPSYM</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">N</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::name</span><span class="plain-syntax">(</span><span class="identifier-syntax">pack</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::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Main_fn"</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><a href="6-erms.html#SP3" class="function-link"><span class="function-syntax">EliminateRedundantMatterStage::preserve</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"it's Main"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"MistakeActionSub_fn"</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><a href="6-erms.html#SP3" class="function-link"><span class="function-syntax">EliminateRedundantMatterStage::preserve</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"it's MistakeActionSub"</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::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"TestScriptSub_fn"</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><a href="6-erms.html#SP3" class="function-link"><span class="function-syntax">EliminateRedundantMatterStage::preserve</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"it's TestScriptSub"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b>Once you need a package, what else do you need?
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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">void</span><span class="plain-syntax"> </span><span class="function-syntax">EliminateRedundantMatterStage::preserve</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">EliminateRedundantMatterStage::preserve</span></span>:<br/><a href="6-erms.html#SP2">&#167;2</a>, <a href="6-erms.html#SP3_1">&#167;3.1</a>, <a href="6-erms.html#SP3_2">&#167;3.2</a>, <a href="6-erms.html#SP3_3">&#167;3.3</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="reserved-syntax">pipeline_step</span><span class="plain-syntax"> *</span><span class="identifier-syntax">step</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">witness</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">reason</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">pack</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">package_flags</span><span class="plain-syntax">) &amp; </span><span class="identifier-syntax">USED_PACKAGE_FLAG</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">pack</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">package_flags</span><span class="plain-syntax"> |= </span><span class="identifier-syntax">USED_PACKAGE_FLAG</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">witness</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">ELIMINATION</span><span class="plain-syntax">, </span><span class="string-syntax">"Need $6 because of $6 (because %S)\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">witness</span><span class="plain-syntax">, </span><span class="identifier-syntax">reason</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">ELIMINATION</span><span class="plain-syntax">, </span><span class="string-syntax">"Need $6 (because %S)\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">reason</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-erms.html#SP3_1" class="named-paragraph-link"><span class="named-paragraph">If you need a package, you need its parent</span><span class="named-paragraph-number">3.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-erms.html#SP3_2" class="named-paragraph-link"><span class="named-paragraph">If you need a package, you need its external dependencies</span><span class="named-paragraph-number">3.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="6-erms.html#SP3_3" class="named-paragraph-link"><span class="named-paragraph">If you need a function or action, you need its internal resources</span><span class="named-paragraph-number">3.3</span></a></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="SP3_1" class="paragraph-anchor"></a><b>&#167;3.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">If you need a package, you need its parent</span><span class="named-paragraph-number">3.1</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="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">parent</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::parent</span><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">parent</span><span class="plain-syntax">) </span><a href="6-erms.html#SP3" class="function-link"><span class="function-syntax">EliminateRedundantMatterStage::preserve</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">parent</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">pack</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="string-syntax">"it's the parent"</span><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="6-erms.html#SP3">&#167;3</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3_2" class="paragraph-anchor"></a><b>&#167;3.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">If you need a package, you need its external dependencies</span><span class="named-paragraph-number">3.2</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="identifier-syntax">inter_symbols_table</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tab</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::scope</span><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_SYMBOLS_TABLE</span><span class="plain-syntax">(</span><span class="identifier-syntax">symb</span><span class="plain-syntax">, </span><span class="identifier-syntax">tab</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">Wiring::is_wired</span><span class="plain-syntax">(</span><span class="identifier-syntax">symb</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Wiring::cable_end</span><span class="plain-syntax">(</span><span class="identifier-syntax">symb</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">needed</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterSymbol::package</span><span class="plain-syntax">(</span><span class="identifier-syntax">E</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="6-erms.html#SP3" class="function-link"><span class="function-syntax">EliminateRedundantMatterStage::preserve</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">needed</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">pack</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="string-syntax">"it's an external symbol"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
<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="6-erms.html#SP3">&#167;3</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3_3" class="paragraph-anchor"></a><b>&#167;3.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">If you need a function or action, you need its internal resources</span><span class="named-paragraph-number">3.3</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">
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">rationale</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">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ptype</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::type</span><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ptype</span><span class="plain-syntax"> == </span><a href="2-rp.html#SP5" class="function-link"><span class="function-syntax">RunningPipelines::get_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="constant-syntax">function_ptype_RPSYM</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">rationale</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="string-syntax">"it's a _function block"</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ptype</span><span class="plain-syntax"> == </span><a href="2-rp.html#SP5" class="function-link"><span class="function-syntax">RunningPipelines::get_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="constant-syntax">action_ptype_RPSYM</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">rationale</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="string-syntax">"it's an _action subpackage"</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">rationale</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">D</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::head</span><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_INTER_CHILDREN</span><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">D</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">-&gt;</span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">ID_IFLD</span><span class="plain-syntax">] == </span><span class="identifier-syntax">PACKAGE_IST</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::at_this_head</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="6-erms.html#SP3" class="function-link"><span class="function-syntax">EliminateRedundantMatterStage::preserve</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">rationale</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
<span class="plain-syntax"> }</span>
<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="6-erms.html#SP3">&#167;3</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. </b>Whatever has not been preserved, is now destroyed.
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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">void</span><span class="plain-syntax"> </span><span class="function-syntax">EliminateRedundantMatterStage::destroyer</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">EliminateRedundantMatterStage::destroyer</span></span>:<br/><a href="6-erms.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">state</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pack</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::at_this_head</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">pack</span><span class="plain-syntax">) &amp;&amp; ((</span><span class="identifier-syntax">pack</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">package_flags</span><span class="plain-syntax"> &amp; </span><span class="identifier-syntax">USED_PACKAGE_FLAG</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">ELIMINATION</span><span class="plain-syntax">, </span><span class="string-syntax">"Striking unused package $6 (type %S)\n"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">InterSymbol::identifier</span><span class="plain-syntax">(</span><span class="identifier-syntax">InterPackage::type</span><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">)));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">NodePlacement::remove</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="plain-syntax">}</span>
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</pre>
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