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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>Code Generation</title>
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<!--Weave of 'Code Generation' generated by Inweb-->
<div class="breadcrumbs">
<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../intern.html">Inter Modules</a></li><li><a href="index.html">final</a></li><li><a href="index.html#2">Chapter 2: Mechanism</a></li><li><b>Code Generation</b></li></ul></div>
<p class="purpose">To generate final code from intermediate code.</p>
<ul class="toc"><li><a href="2-cg.html#SP1">&#167;1. Pipeline stage</a></li><li><a href="2-cg.html#SP4">&#167;4. Sorting by annotation value</a></li><li><a href="2-cg.html#SP5">&#167;5. Sorting by metadata value</a></li><li><a href="2-cg.html#SP6">&#167;6. Ad hoc generation</a></li><li><a href="2-cg.html#SP7">&#167;7. Literal text modes</a></li><li><a href="2-cg.html#SP8">&#167;8. Segmentation</a></li><li><a href="2-cg.html#SP16">&#167;16. Transients</a></li><li><a href="2-cg.html#SP18">&#167;18. Value pairs</a></li></ul><hr class="tocbar">
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. Pipeline stage. </b>This whole module exists to provide a single pipeline stage, making the final
generation of code from a tree of fully-linked and generally complete Inter.
</p>
<p class="commentary">It comes in two forms (the optional one writes nothing if no filename is supplied
to it; the compulsory one throws an error in that case), but note that both call
the same function.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::create_pipeline_stage</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ParsingPipelines::new_stage</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"generate"</span><span class="plain-syntax">, </span><a href="2-cg.html#SP1" class="function-link"><span class="function-syntax">CodeGen::run_pipeline_stage</span></a><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">TEXT_OUT_STAGE_ARG</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ParsingPipelines::new_stage</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"optionally-generate"</span><span class="plain-syntax">, </span><a href="2-cg.html#SP1" class="function-link"><span class="function-syntax">CodeGen::run_pipeline_stage</span></a><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">OPTIONAL_TEXT_OUT_STAGE_ARG</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::run_pipeline_stage</span><span class="plain-syntax">(</span><span class="identifier-syntax">pipeline_step</span><span class="plain-syntax"> *</span><span class="identifier-syntax">step</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">step</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">generator_argument</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP2" class="function-link"><span class="function-syntax">CodeGen::new_generation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">ephemera</span><span class="plain-syntax">.</span><span class="identifier-syntax">parsed_filename</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">step</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">ephemera</span><span class="plain-syntax">.</span><span class="element-syntax">to_stream</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">ephemera</span><span class="plain-syntax">.</span><span class="identifier-syntax">tree</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">ephemera</span><span class="plain-syntax">.</span><span class="identifier-syntax">package_argument</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">step</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">generator_argument</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">ephemera</span><span class="plain-syntax">.</span><span class="element-syntax">for_VM</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-cg2.html#SP4" class="function-link"><span class="function-syntax">Generators::go</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</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>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>A "generation" is a single act of translating inter code into final code.
It will be carried out by the "generator", using the data held in the following
object.
</p>
<pre class="displayed-code all-displayed-code code-font">
<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">code_generation</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">code_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">generator</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">pipeline_step</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from_step</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">for_VM</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">generator_private_data</span><span class="plain-syntax">; </span><span class="comment-syntax"> depending on the target generated to</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">to_file</span><span class="plain-syntax">; </span><span class="comment-syntax"> filename of output, and/or...</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">to_stream</span><span class="plain-syntax">; </span><span class="comment-syntax"> stream for textual output</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">just_this_package</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">segmentation_data</span><span class="plain-syntax"> </span><span class="identifier-syntax">segmentation</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">void_level</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">literal_text_mode</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">global_variables</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">text_literals</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">assimilated_properties</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">unassimilated_properties</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">instances</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">kinds</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">kinds_in_declaration_order</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">instances_in_declaration_order</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">true_action_count</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">fake_action_count</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">actions</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">text_stream</span></span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">dword_count</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">words</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">vanilla_dword</span></span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">dictionary</span><span class="plain-syntax"> *</span><span class="identifier-syntax">dword_dictionary</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">vanilla_dword</span></span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">verb_count</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">verbs</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">vanilla_dword</span></span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">verb_grammar</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">text_stream</span></span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">code_generation</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="function-syntax">CodeGen::new_generation</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">CodeGen::new_generation</span></span>:<br/><a href="2-cg.html#SP1">&#167;1</a>, <a href="2-cg.html#SP6">&#167;6</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">pipeline_step</span><span class="plain-syntax"> *</span><span class="identifier-syntax">step</span><span class="plain-syntax">, </span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">T</span><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_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">just</span><span class="plain-syntax">, </span><span class="reserved-syntax">code_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">generator</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">temp</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">from_step</span><span class="plain-syntax"> = </span><span class="identifier-syntax">step</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">to_file</span><span class="plain-syntax"> = </span><span class="identifier-syntax">F</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">to_stream</span><span class="plain-syntax"> = </span><span class="identifier-syntax">T</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">VM</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">generator</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 way to determine format"</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">VM</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">VM</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TargetVMs::find</span><span class="plain-syntax">(</span><span class="identifier-syntax">generator</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">generator_name</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">for_VM</span><span class="plain-syntax"> = </span><span class="identifier-syntax">VM</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">from</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">generator</span><span class="plain-syntax"> = </span><span class="identifier-syntax">generator</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">just</span><span class="plain-syntax">) </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">just_this_package</span><span class="plain-syntax"> = </span><span class="identifier-syntax">just</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">just_this_package</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LargeScale::main_package</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP9" class="function-link"><span class="function-syntax">CodeGen::new_segmentation_data</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">void_level</span><span class="plain-syntax"> = -1;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">literal_text_mode</span><span class="plain-syntax"> = </span><span class="constant-syntax">REGULAR_LTM</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">global_variables</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">text_literals</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">assimilated_properties</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">unassimilated_properties</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">instances</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">kinds</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">kinds_in_declaration_order</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">instances_in_declaration_order</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">true_action_count</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">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">fake_action_count</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">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">actions</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">dword_count</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">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">words</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">vanilla_dword</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">dword_dictionary</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Dictionaries::new</span><span class="plain-syntax">(1024, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">verb_count</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">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">verbs</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">vanilla_dword</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">verb_grammar</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</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">temp</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="named-paragraph-container code-font"><a href="2-cg.html#SP2_1" class="named-paragraph-link"><span class="named-paragraph">Traverse for global bric-a-brac</span><span class="named-paragraph-number">2.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<ul class="endnotetexts"><li>The structure code_generation is accessed in 2/cg2, 2/vnl, 2/vc, 2/vf, 2/vo, 2/vc2, 2/vi, 3/fti, 3/fbi, 3/fi, 4/fi6, 4/i6c, 4/i6o, 4/i6c2, 5/fnc, 5/cnm, 5/crf, 5/cmm, 5/cpc, 5/ccn, 5/clt, 5/com, 5/cfm and here.</li></ul>
<p class="commentary firstcommentary"><a id="SP2_1" class="paragraph-anchor"></a><b>&#167;2.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Traverse for global bric-a-brac</span><span class="named-paragraph-number">2.1</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="identifier-syntax">InterTree::traverse</span><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">from</span><span class="plain-syntax">, </span><a href="2-cg.html#SP3" class="function-link"><span class="function-syntax">CodeGen::gather_up</span></a><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-cg.html#SP3" class="function-link"><span class="function-syntax">CodeGen::sort_symbol_list</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">kinds_in_declaration_order</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">kinds</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><a href="2-cg.html#SP5" class="function-link"><span class="function-syntax">CodeGen::in_declaration_md_order</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-cg.html#SP3" class="function-link"><span class="function-syntax">CodeGen::sort_symbol_list</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">instances_in_declaration_order</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">instances</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><a href="2-cg.html#SP5" class="function-link"><span class="function-syntax">CodeGen::in_declaration_md_order</span></a><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-cg.html#SP2">&#167;2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::gather_up</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">CodeGen::gather_up</span></span>:<br/><a href="2-cg.html#SP2_1">&#167;2.1</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>
<span class="plain-syntax"> </span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">state</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Inode::get_construct_ID</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">VARIABLE_IST:</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">var_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">VariableInstruction::variable</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">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">var_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">global_variables</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">PROPERTY_IST:</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">prop_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">PropertyInstruction::property</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</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">SymbolAnnotation::get_b</span><span class="plain-syntax">(</span><span class="identifier-syntax">prop_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">ASSIMILATED_IANN</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">prop_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">assimilated_properties</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">prop_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">unassimilated_properties</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">INSTANCE_IST:</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">inst_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InstanceInstruction::instance</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">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">inst_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">instances</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">TYPENAME_IST:</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">typename</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TypenameInstruction::typename</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">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">typename</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">kinds</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::sort_symbol_list</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">CodeGen::sort_symbol_list</span></span>:<br/><a href="2-cg.html#SP2_1">&#167;2.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">to_L</span><span class="plain-syntax">, </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">L</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">sorter</span><span class="plain-syntax">)(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">elem1</span><span class="plain-syntax">, </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">elem2</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">L</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">N</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</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">array</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> **)</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">Memory::calloc</span><span class="plain-syntax">(</span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *), </span><span class="constant-syntax">CODE_GENERATION_MREASON</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sym</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">sym</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="plain-syntax">) </span><span class="identifier-syntax">array</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">++] = </span><span class="identifier-syntax">sym</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">qsort</span><span class="plain-syntax">(</span><span class="identifier-syntax">array</span><span class="plain-syntax">, (</span><span class="identifier-syntax">size_t</span><span class="plain-syntax">) </span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *), </span><span class="identifier-syntax">sorter</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">j</span><span class="plain-syntax">&lt;</span><span class="identifier-syntax">N</span><span class="plain-syntax">; </span><span class="identifier-syntax">j</span><span class="plain-syntax">++) </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">array</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</span><span class="plain-syntax">], </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">, </span><span class="identifier-syntax">to_L</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Memory::I7_array_free</span><span class="plain-syntax">(</span><span class="identifier-syntax">array</span><span class="plain-syntax">, </span><span class="constant-syntax">CODE_GENERATION_MREASON</span><span class="plain-syntax">, </span><span class="identifier-syntax">N</span><span class="plain-syntax">, </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *));</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. Sorting by annotation value. </b>We stopped doing this in March 2022, but the function seems worth keeping around.
It provides a criterion for sorting a list of symbols by looking at the values
of a numerical annotation, with symbols not having that annotation pushed to
the back.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::in_annotation_order</span><span class="plain-syntax">(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">elem1</span><span class="plain-syntax">, </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">elem2</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">annot</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> **</span><span class="identifier-syntax">e1</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">elem1</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> **</span><span class="identifier-syntax">e2</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">elem2</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">e1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (*</span><span class="identifier-syntax">e2</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"Disaster while sorting kinds"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">s1</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP4" class="function-link"><span class="function-syntax">CodeGen::sequence_number</span></a><span class="plain-syntax">(*</span><span class="identifier-syntax">e1</span><span class="plain-syntax">, </span><span class="identifier-syntax">annot</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">s2</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP4" class="function-link"><span class="function-syntax">CodeGen::sequence_number</span></a><span class="plain-syntax">(*</span><span class="identifier-syntax">e2</span><span class="plain-syntax">, </span><span class="identifier-syntax">annot</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">s1</span><span class="plain-syntax"> != </span><span class="identifier-syntax">s2</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">s1</span><span class="plain-syntax">-</span><span class="identifier-syntax">s2</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">InterSymbol::sort_number</span><span class="plain-syntax">(*</span><span class="identifier-syntax">e1</span><span class="plain-syntax">) - </span><span class="identifier-syntax">InterSymbol::sort_number</span><span class="plain-syntax">(*</span><span class="identifier-syntax">e2</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::sequence_number</span><span class="plain-syntax">(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">kind_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">annot</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax"> = </span><span class="identifier-syntax">SymbolAnnotation::get_i</span><span class="plain-syntax">(</span><span class="identifier-syntax">kind_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">annot</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">N</span><span class="plain-syntax"> &gt;= </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">100000000</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. Sorting by metadata value. </b>The preferred alternative is to sort by the value of a metadata key present in
the same packages as the symbols:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::in_source_md_order</span><span class="plain-syntax">(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">elem1</span><span class="plain-syntax">, </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">elem2</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-cg.html#SP5" class="function-link"><span class="function-syntax">CodeGen::in_md_order</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">elem1</span><span class="plain-syntax">, </span><span class="identifier-syntax">elem2</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"^source_order"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::in_declaration_md_order</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">CodeGen::in_declaration_md_order</span></span>:<br/><a href="2-cg.html#SP2_1">&#167;2.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">elem1</span><span class="plain-syntax">, </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">elem2</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-cg.html#SP5" class="function-link"><span class="function-syntax">CodeGen::in_md_order</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">elem1</span><span class="plain-syntax">, </span><span class="identifier-syntax">elem2</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"^declaration_order"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::in_md_order</span><span class="plain-syntax">(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">elem1</span><span class="plain-syntax">, </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">elem2</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">key</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> **</span><span class="identifier-syntax">e1</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">elem1</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> **</span><span class="identifier-syntax">e2</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">elem2</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">e1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (*</span><span class="identifier-syntax">e2</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"Disaster while sorting kinds"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">s1</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP5" class="function-link"><span class="function-syntax">CodeGen::md_number</span></a><span class="plain-syntax">(*</span><span class="identifier-syntax">e1</span><span class="plain-syntax">, </span><span class="identifier-syntax">key</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">s2</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP5" class="function-link"><span class="function-syntax">CodeGen::md_number</span></a><span class="plain-syntax">(*</span><span class="identifier-syntax">e2</span><span class="plain-syntax">, </span><span class="identifier-syntax">key</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">s1</span><span class="plain-syntax"> != </span><span class="identifier-syntax">s2</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">s1</span><span class="plain-syntax">-</span><span class="identifier-syntax">s2</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">InterSymbol::sort_number</span><span class="plain-syntax">(*</span><span class="identifier-syntax">e1</span><span class="plain-syntax">) - </span><span class="identifier-syntax">InterSymbol::sort_number</span><span class="plain-syntax">(*</span><span class="identifier-syntax">e2</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::md_number</span><span class="plain-syntax">(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">owner_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">key</span><span class="plain-syntax">) {</span>
<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">InterSymbol::package</span><span class="plain-syntax">((</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">owner_name</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">Metadata::exists</span><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">key</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">Metadata::read_optional_numeric</span><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">, </span><span class="identifier-syntax">key</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">100000000</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>&#167;6. Ad hoc generation. </b>This module would be more elegant if the following function did not exist. But
it is a consequence of the <span class="extract"><span class="extract-syntax">(+</span></span> ... <span class="extract"><span class="extract-syntax">+)</span></span> feature of Inform, which plunges
right through all kinds of conceptual barriers better left unplunged-through.
Happily, it's both limited and little-used. The task is to turn a single Inter
value-pair into the text of an expression which will represent it at run-time.
</p>
<p class="commentary">This is called by Inform 7 during a drastically earlier phase of compilation,
long before the <a href="index.html" class="internal">final</a> module would otherwise be involved, and there's no
question of performing a full generation of an entire Inter tree. So we make
a sort of mock-generation object, the <span class="extract"><span class="extract-syntax">ad_hoc_generation</span></span>, just for the purpose
of this function call. We could make a new mock object every time, because there
aren't such a lot of calls to this function, but instead we make just one and
re-use it.
</p>
<p class="commentary">The mock generator makes no use of segmentation (see below) except for the
single temporary segment, which is set to <span class="extract"><span class="extract-syntax">OUT</span></span>.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ad_hoc_generation</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::val_to_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_pair</span><span class="plain-syntax"> </span><span class="identifier-syntax">val</span><span class="plain-syntax">, </span><span class="identifier-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</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">ad_hoc_generation</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</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">VM</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 VM given"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">code_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">generator</span><span class="plain-syntax"> = </span><a href="2-cg2.html#SP2" class="function-link"><span class="function-syntax">Generators::find_for</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">VM</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">generator</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">"VM family with no generator"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ad_hoc_generation</span><span class="plain-syntax"> =</span>
<span class="plain-syntax"> </span><a href="2-cg.html#SP2" class="function-link"><span class="function-syntax">CodeGen::new_generation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">InterBookmark::tree</span><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">generator</span><span class="plain-syntax">, </span><span class="identifier-syntax">VM</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">code_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">generator</span><span class="plain-syntax"> = </span><a href="2-cg2.html#SP2" class="function-link"><span class="function-syntax">Generators::find_for</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">VM</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">generator</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">"VM family with no generator"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ad_hoc_generation</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">for_VM</span><span class="plain-syntax"> = </span><span class="identifier-syntax">VM</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ad_hoc_generation</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">generator</span><span class="plain-syntax"> = </span><span class="identifier-syntax">generator</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><a href="2-cg.html#SP13" class="function-link"><span class="function-syntax">CodeGen::select_temporary</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ad_hoc_generation</span><span class="plain-syntax">, </span><span class="identifier-syntax">OUT</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-cg.html#SP18" class="function-link"><span class="function-syntax">CodeGen::pair_at_bookmark</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ad_hoc_generation</span><span class="plain-syntax">, </span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-cg.html#SP13" class="function-link"><span class="function-syntax">CodeGen::deselect_temporary</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ad_hoc_generation</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>&#167;7. Literal text modes. </b>There are three of these. <span class="extract"><span class="extract-syntax">PRINTING_LTM</span></span> is used when text is needed only
immediately as an operand for, say, <span class="extract"><span class="extract-syntax">!print</span></span> and will therefore never be a
value at runtime; <span class="extract"><span class="extract-syntax">BOX_LTM</span></span> for "quotation box" text; <span class="extract"><span class="extract-syntax">REGULAR_LTM</span></span> for
everything else.
</p>
<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">REGULAR_LTM</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">BOX_LTM</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">PRINTING_LTM</span><span class="plain-syntax"> </span><span class="constant-syntax">2</span>
</pre>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::lt_mode</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">CodeGen::lt_mode</span></span>:<br/>Inform 6 Code - <a href="4-i6c2.html#SP6_9">&#167;6.9</a><br/>C Input-Output Model - <a href="5-cim.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">m</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">literal_text_mode</span><span class="plain-syntax"> = </span><span class="identifier-syntax">m</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>&#167;8. Segmentation. </b>Generators have flexibility in how they go about their business, but if they are
making what amounts to a text file with a lot of internal structure then the
following system may be a convenience. It allows text to be assembled as a set
of "segments" which can be appended to in any order, and which are then put
together in a logical order at the end.
</p>
<p class="commentary">Segments are identified by ID numbers counting up from 0, 1, 2, ...: but
ID number 0 is <span class="extract"><span class="extract-syntax">no_I7CGS</span></span>, reserved to mean "not a segment".
</p>
<p class="commentary">A segment is itself internally stratified into numbered "layers", and these
are used to help generators cope with more nuanced ordering issues &mdash; e.g.,
where two declarations are of basically the same sort of thing, and should
be in the same segment as each other; but where one must nevertheless precede
the other. This can be achieved by putting the one to come first at a
lower-numbered level.
</p>
<pre class="definitions code-font"><span class="definition-keyword">enum</span> <span class="constant-syntax">no_I7CGS</span><span class="plain-syntax"> </span><span class="identifier-syntax">from</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span>
<span class="definition-keyword">define</span> <span class="constant-syntax">MAX_LAYERS_PER_SEGMENT</span><span class="plain-syntax"> </span><span class="constant-syntax">128</span>
</pre>
<pre class="displayed-code all-displayed-code code-font">
<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">generated_segment</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">layers</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">generated_code</span><span class="plain-syntax">[</span><span class="constant-syntax">MAX_LAYERS_PER_SEGMENT</span><span class="plain-syntax">];</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">generated_segment</span><span class="plain-syntax"> *</span><span class="function-syntax">CodeGen::new_segment</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">CodeGen::new_segment</span></span>:<br/><a href="2-cg.html#SP10">&#167;10</a>, <a href="2-cg.html#SP11">&#167;11</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax"> *</span><span class="identifier-syntax">seg</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">seg</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">layers</span><span class="plain-syntax"> = </span><span class="constant-syntax">MAX_LAYERS_PER_SEGMENT</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="function-syntax">&lt;seg-&gt;</span><span class="element-syntax">layers</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) </span><span class="identifier-syntax">seg</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">generated_code</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] = </span><span class="identifier-syntax">Str::new</span><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">seg</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<ul class="endnotetexts"><li>The structure generated_segment is private to this section.</li></ul>
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>&#167;9. </b>Each generation has its own copy of every possible numbered segment, though
by default those are <span class="extract"><span class="extract-syntax">NULL</span></span>.
</p>
<pre class="displayed-code all-displayed-code code-font">
<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">segmentation_data</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax"> *</span><span class="identifier-syntax">segments</span><span class="plain-syntax">[</span><span class="identifier-syntax">NO_DEFINED_I7CGS_VALUES</span><span class="plain-syntax">];</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">segment_sequence</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">generated_segment</span></span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">additional_segment_sequence</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">generated_segment</span></span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">temporarily_diverted_to</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">temporarily_diverted</span><span class="plain-syntax">; </span><span class="comment-syntax"> to the temporary segment</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="identifier-syntax">pos</span><span class="plain-syntax">;</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">segmentation_data</span><span class="plain-syntax">;</span>
<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">segmentation_pos</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax"> *</span><span class="identifier-syntax">current_segment</span><span class="plain-syntax">; </span><span class="comment-syntax"> the one currently being written to</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">current_layer</span><span class="plain-syntax">; </span><span class="comment-syntax"> within that segment: in the range 0 to current_segment-&gt;layers - 1</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">segmentation_data</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::new_segmentation_data</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">CodeGen::new_segmentation_data</span></span>:<br/><a href="2-cg.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">segmentation_data</span><span class="plain-syntax"> </span><span class="identifier-syntax">sd</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">sd</span><span class="plain-syntax">.</span><span class="element-syntax">segment_sequence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">sd</span><span class="plain-syntax">.</span><span class="element-syntax">additional_segment_sequence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">sd</span><span class="plain-syntax">.</span><span class="element-syntax">temporarily_diverted</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">sd</span><span class="plain-syntax">.</span><span class="element-syntax">temporarily_diverted_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax">&lt;</span><span class="identifier-syntax">NO_DEFINED_I7CGS_VALUES</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) </span><span class="identifier-syntax">sd</span><span class="plain-syntax">.</span><span class="element-syntax">segments</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">sd</span><span class="plain-syntax">.</span><span class="element-syntax">pos</span><span class="plain-syntax">.</span><span class="identifier-syntax">current_segment</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">sd</span><span class="plain-syntax">.</span><span class="element-syntax">pos</span><span class="plain-syntax">.</span><span class="identifier-syntax">current_layer</span><span class="plain-syntax"> = </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">sd</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<ul class="endnotetexts"><li>The structure segmentation_data is accessed in 5/fnc and here.</li><li>The structure segmentation_pos is private to this section.</li></ul>
<p class="commentary firstcommentary"><a id="SP10" class="paragraph-anchor"></a><b>&#167;10. </b>If a generator wants to use this system, it should call <a href="2-cg.html#SP10" class="internal">CodeGen::create_segments</a>
to say which segments it wants to be created, passing an array of ID numbers. The
order of these is significant &mdash; it's the order in which they will appear in the final
output.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::create_segments</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">CodeGen::create_segments</span></span>:<br/>Generating Inform 6 - <a href="4-fi6.html#SP4">&#167;4</a><br/>Final C - <a href="5-fnc.html#SP5">&#167;5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">codes</span><span class="plain-syntax">[]) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">segment_sequence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">codes</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] &gt;= </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</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">codes</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] &gt;= </span><span class="identifier-syntax">NO_DEFINED_I7CGS_VALUES</span><span class="plain-syntax">) ||</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">codes</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] == </span><span class="constant-syntax">no_I7CGS</span><span class="plain-syntax">)) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"bad segment sequence"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">segments</span><span class="plain-syntax">[</span><span class="identifier-syntax">codes</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]] = </span><a href="2-cg.html#SP8" class="function-link"><span class="function-syntax">CodeGen::new_segment</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">segments</span><span class="plain-syntax">[</span><span class="identifier-syntax">codes</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]], </span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">segment_sequence</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">generator_private_data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">data</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP11" class="paragraph-anchor"></a><b>&#167;11. </b>An optional "alternative" set can also be created.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::additional_segments</span><button class="popup" onclick="togglePopup('usagePopup9')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup9">Usage of <span class="code-font"><span class="function-syntax">CodeGen::additional_segments</span></span>:<br/>Final C - <a href="5-fnc.html#SP5">&#167;5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">codes</span><span class="plain-syntax">[]) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">additional_segment_sequence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">codes</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] &gt;= </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</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">codes</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] &gt;= </span><span class="identifier-syntax">NO_DEFINED_I7CGS_VALUES</span><span class="plain-syntax">) ||</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">codes</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] == </span><span class="constant-syntax">no_I7CGS</span><span class="plain-syntax">)) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"bad segment sequence"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">segments</span><span class="plain-syntax">[</span><span class="identifier-syntax">codes</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]] = </span><a href="2-cg.html#SP8" class="function-link"><span class="function-syntax">CodeGen::new_segment</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">segments</span><span class="plain-syntax">[</span><span class="identifier-syntax">codes</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]], </span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">additional_segment_sequence</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP12" class="paragraph-anchor"></a><b>&#167;12. </b>At any given time, a generation has a "current" segment, to which output is
being written. The generator should use <a href="2-cg.html#SP12" class="internal">CodeGen::select</a> to switch to a given
segment, which must be one of those it has created, and then use <a href="2-cg.html#SP12" class="internal">CodeGen::deselect</a>
to go back to where it was. These calls must be made in properly nested pairs.
</p>
<p class="commentary">At some point we may want to make the cap on the number of layers flexible,
but for now about 10 layers is plenty.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::select</span><button class="popup" onclick="togglePopup('usagePopup10')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup10">Usage of <span class="code-font"><span class="function-syntax">CodeGen::select</span></span>:<br/>Generating Inform 6 - <a href="4-fi6.html#SP4_1">&#167;4.1</a>, <a href="4-fi6.html#SP4_2">&#167;4.2</a>, <a href="4-fi6.html#SP5">&#167;5</a><br/>Inform 6 Constants - <a href="4-i6c.html#SP3_1">&#167;3.1</a>, <a href="4-i6c.html#SP3_2">&#167;3.2</a>, <a href="4-i6c.html#SP5">&#167;5</a><br/>Inform 6 Global Variables - <a href="4-i6gv.html#SP2_1">&#167;2.1</a>, <a href="4-i6gv.html#SP2_2">&#167;2.2</a>, <a href="4-i6gv.html#SP2_3">&#167;2.3</a>, <a href="4-i6gv.html#SP2_4">&#167;2.4</a><br/>Inform 6 Objects - <a href="4-i6o.html#SP4_3">&#167;4.3</a>, <a href="4-i6o.html#SP4_4">&#167;4.4</a>, <a href="4-i6o.html#SP4_5">&#167;4.5</a>, <a href="4-i6o.html#SP4_6">&#167;4.6</a>, <a href="4-i6o.html#SP5_1">&#167;5.1</a>, <a href="4-i6o.html#SP9">&#167;9</a>, <a href="4-i6o.html#SP13_1">&#167;13.1</a>, <a href="4-i6o.html#SP13_2">&#167;13.2</a>, <a href="4-i6o.html#SP13_3">&#167;13.3</a><br/>Inform 6 Code - <a href="4-i6c2.html#SP2">&#167;2</a>, <a href="4-i6c2.html#SP9">&#167;9</a><br/>Final C - <a href="5-fnc.html#SP5_2">&#167;5.2</a>, <a href="5-fnc.html#SP5_3">&#167;5.3</a>, <a href="5-fnc.html#SP6_1">&#167;6.1</a><br/>C Global Variables - <a href="5-cgv.html#SP2">&#167;2</a>, <a href="5-cgv.html#SP3">&#167;3</a>, <a href="5-cgv.html#SP3_1">&#167;3.1</a>, <a href="5-cgv.html#SP3_2">&#167;3.2</a>, <a href="5-cgv.html#SP3_3">&#167;3.3</a>, <a href="5-cgv.html#SP3_4">&#167;3.4</a>, <a href="5-cgv.html#SP4">&#167;4</a><br/>C Memory Model - <a href="5-cmm.html#SP2">&#167;2</a>, <a href="5-cmm.html#SP3">&#167;3</a>, <a href="5-cmm.html#SP4_1">&#167;4.1</a>, <a href="5-cmm.html#SP4_2">&#167;4.2</a>, <a href="5-cmm.html#SP4_2_2">&#167;4.2.2</a>, <a href="5-cmm.html#SP5">&#167;5</a>, <a href="5-cmm.html#SP6">&#167;6</a><br/>C Assembly - <a href="5-cas.html#SP5_2">&#167;5.2</a><br/>C Literals - <a href="5-clt.html#SP7">&#167;7</a>, <a href="5-clt.html#SP8">&#167;8</a><br/>C Object Model - <a href="5-com.html#SP2">&#167;2</a>, <a href="5-com.html#SP4">&#167;4</a>, <a href="5-com.html#SP7">&#167;7</a>, <a href="5-com.html#SP10">&#167;10</a>, <a href="5-com.html#SP13">&#167;13</a>, <a href="5-com.html#SP16">&#167;16</a>, <a href="5-com.html#SP17">&#167;17</a>, <a href="5-com.html#SP20_1">&#167;20.1</a>, <a href="5-com.html#SP20_3">&#167;20.3</a>, <a href="5-com.html#SP24">&#167;24</a>, <a href="5-com.html#SP34">&#167;34</a><br/>C Function Model - <a href="5-cfm.html#SP2">&#167;2</a>, <a href="5-cfm.html#SP4">&#167;4</a>, <a href="5-cfm.html#SP6">&#167;6</a>, <a href="5-cfm.html#SP8">&#167;8</a>, <a href="5-cfm.html#SP12">&#167;12</a>, <a href="5-cfm.html#SP14_1">&#167;14.1</a>, <a href="5-cfm.html#SP14_2">&#167;14.2</a>, <a href="5-cfm.html#SP14_3">&#167;14.3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::select_layered</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="constant-syntax">1</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::select_layered</span><button class="popup" onclick="togglePopup('usagePopup11')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup11">Usage of <span class="code-font"><span class="function-syntax">CodeGen::select_layered</span></span>:<br/>Inform 6 Constants - <a href="4-i6c.html#SP2">&#167;2</a><br/>C Namespace - <a href="5-cnm.html#SP7">&#167;7</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">layer</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="identifier-syntax">previous_pos</span><span class="plain-syntax"> = </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">pos</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">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">temporarily_diverted</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"poorly timed selection"</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">i</span><span class="plain-syntax"> &lt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> &gt;= </span><span class="identifier-syntax">NO_DEFINED_I7CGS_VALUES</span><span class="plain-syntax">)) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"out of range"</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">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">segments</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"generator does not use this segment ID"</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">layer</span><span class="plain-syntax"> &gt;= </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">segments</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]-&gt;</span><span class="element-syntax">layers</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"too many layers"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">pos</span><span class="plain-syntax">.</span><span class="element-syntax">current_segment</span><span class="plain-syntax"> = </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">segments</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">];</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">pos</span><span class="plain-syntax">.</span><span class="element-syntax">current_layer</span><span class="plain-syntax"> = </span><span class="identifier-syntax">layer</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">previous_pos</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::deselect</span><button class="popup" onclick="togglePopup('usagePopup12')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup12">Usage of <span class="code-font"><span class="function-syntax">CodeGen::deselect</span></span>:<br/>Generating Inform 6 - <a href="4-fi6.html#SP4_1">&#167;4.1</a>, <a href="4-fi6.html#SP4_2">&#167;4.2</a>, <a href="4-fi6.html#SP5">&#167;5</a><br/>Inform 6 Constants - <a href="4-i6c.html#SP2">&#167;2</a>, <a href="4-i6c.html#SP4">&#167;4</a>, <a href="4-i6c.html#SP5">&#167;5</a><br/>Inform 6 Global Variables - <a href="4-i6gv.html#SP2_1">&#167;2.1</a>, <a href="4-i6gv.html#SP2_2">&#167;2.2</a>, <a href="4-i6gv.html#SP2_3">&#167;2.3</a>, <a href="4-i6gv.html#SP2_4">&#167;2.4</a><br/>Inform 6 Objects - <a href="4-i6o.html#SP4_3">&#167;4.3</a>, <a href="4-i6o.html#SP4_4">&#167;4.4</a>, <a href="4-i6o.html#SP4_5">&#167;4.5</a>, <a href="4-i6o.html#SP4_6">&#167;4.6</a>, <a href="4-i6o.html#SP6">&#167;6</a>, <a href="4-i6o.html#SP9">&#167;9</a>, <a href="4-i6o.html#SP13_1">&#167;13.1</a>, <a href="4-i6o.html#SP13_2">&#167;13.2</a>, <a href="4-i6o.html#SP13_3">&#167;13.3</a><br/>Inform 6 Code - <a href="4-i6c2.html#SP2">&#167;2</a>, <a href="4-i6c2.html#SP9">&#167;9</a><br/>Final C - <a href="5-fnc.html#SP5_2">&#167;5.2</a>, <a href="5-fnc.html#SP5_3">&#167;5.3</a>, <a href="5-fnc.html#SP6_1">&#167;6.1</a><br/>C Namespace - <a href="5-cnm.html#SP7">&#167;7</a><br/>C Global Variables - <a href="5-cgv.html#SP2">&#167;2</a>, <a href="5-cgv.html#SP3">&#167;3</a>, <a href="5-cgv.html#SP3_1">&#167;3.1</a>, <a href="5-cgv.html#SP3_2">&#167;3.2</a>, <a href="5-cgv.html#SP3_3">&#167;3.3</a>, <a href="5-cgv.html#SP3_4">&#167;3.4</a>, <a href="5-cgv.html#SP4">&#167;4</a><br/>C Memory Model - <a href="5-cmm.html#SP2">&#167;2</a>, <a href="5-cmm.html#SP3">&#167;3</a>, <a href="5-cmm.html#SP4_2_2">&#167;4.2.2</a>, <a href="5-cmm.html#SP5">&#167;5</a>, <a href="5-cmm.html#SP6">&#167;6</a><br/>C Assembly - <a href="5-cas.html#SP5_2">&#167;5.2</a><br/>C Literals - <a href="5-clt.html#SP7">&#167;7</a>, <a href="5-clt.html#SP8">&#167;8</a><br/>C Object Model - <a href="5-com.html#SP2">&#167;2</a>, <a href="5-com.html#SP4">&#167;4</a>, <a href="5-com.html#SP7">&#167;7</a>, <a href="5-com.html#SP10">&#167;10</a>, <a href="5-com.html#SP13">&#167;13</a>, <a href="5-com.html#SP16">&#167;16</a>, <a href="5-com.html#SP17">&#167;17</a>, <a href="5-com.html#SP20_1">&#167;20.1</a>, <a href="5-com.html#SP20_3">&#167;20.3</a>, <a href="5-com.html#SP24">&#167;24</a>, <a href="5-com.html#SP34">&#167;34</a><br/>C Function Model - <a href="5-cfm.html#SP2">&#167;2</a>, <a href="5-cfm.html#SP4">&#167;4</a>, <a href="5-cfm.html#SP6">&#167;6</a>, <a href="5-cfm.html#SP8">&#167;8</a>, <a href="5-cfm.html#SP12">&#167;12</a>, <a href="5-cfm.html#SP14_1">&#167;14.1</a>, <a href="5-cfm.html#SP14_2">&#167;14.2</a>, <a href="5-cfm.html#SP14_3">&#167;14.3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="identifier-syntax">saved</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">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">temporarily_diverted</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"poorly timed deselection"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">pos</span><span class="plain-syntax"> = </span><span class="identifier-syntax">saved</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP13" class="paragraph-anchor"></a><b>&#167;13. </b>However, we can also temporarily divert the whole system to send its text to
some temporary stream somewhere. For that, use the following pair:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::select_temporary</span><button class="popup" onclick="togglePopup('usagePopup13')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup13">Usage of <span class="code-font"><span class="function-syntax">CodeGen::select_temporary</span></span>:<br/><a href="2-cg.html#SP6">&#167;6</a><br/>Vanilla Constants - <a href="2-vc.html#SP1_6">&#167;1.6</a><br/>Vanilla Objects - <a href="2-vo.html#SP2_2_1_2">&#167;2.2.1.2</a>, <a href="2-vo.html#SP4_1_1_1_1_1_1">&#167;4.1.1.1.1.1.1</a><br/>Inform 6 Objects - <a href="4-i6o.html#SP11">&#167;11</a><br/>C Assembly - <a href="5-cas.html#SP6_3">&#167;6.3</a><br/>C Object Model - <a href="5-com.html#SP21">&#167;21</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">T</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">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">temporarily_diverted</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"nested temporary segments"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">temporarily_diverted_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">T</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">temporarily_diverted</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::deselect_temporary</span><button class="popup" onclick="togglePopup('usagePopup14')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup14">Usage of <span class="code-font"><span class="function-syntax">CodeGen::deselect_temporary</span></span>:<br/><a href="2-cg.html#SP6">&#167;6</a><br/>Vanilla Constants - <a href="2-vc.html#SP1_6">&#167;1.6</a><br/>Vanilla Objects - <a href="2-vo.html#SP2_2_1_2">&#167;2.2.1.2</a>, <a href="2-vo.html#SP4_1_1_1_1_1_1">&#167;4.1.1.1.1.1.1</a><br/>Inform 6 Objects - <a href="4-i6o.html#SP11">&#167;11</a><br/>C Assembly - <a href="5-cas.html#SP6_3">&#167;6.3</a><br/>C Object Model - <a href="5-com.html#SP21">&#167;21</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">temporarily_diverted_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">temporarily_diverted</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP14" class="paragraph-anchor"></a><b>&#167;14. </b>The following returns the text stream a generator should write to. Note that
if it has been "temporarily diverted" then the regular selection is ignored.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">CodeGen::current</span><button class="popup" onclick="togglePopup('usagePopup15')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup15">Usage of <span class="code-font"><span class="function-syntax">CodeGen::current</span></span>:<br/><a href="2-cg.html#SP18_1">&#167;18.1</a><br/>Vanilla - <a href="2-vnl.html#SP4">&#167;4</a><br/>Vanilla Constants - <a href="2-vc.html#SP2">&#167;2</a><br/>Vanilla Objects - <a href="2-vo.html#SP5">&#167;5</a><br/>Generating Inform 6 - <a href="4-fi6.html#SP4_1">&#167;4.1</a>, <a href="4-fi6.html#SP4_2">&#167;4.2</a>, <a href="4-fi6.html#SP5">&#167;5</a><br/>Inform 6 Constants - <a href="4-i6c.html#SP2">&#167;2</a>, <a href="4-i6c.html#SP3_1">&#167;3.1</a>, <a href="4-i6c.html#SP3_2">&#167;3.2</a>, <a href="4-i6c.html#SP4">&#167;4</a>, <a href="4-i6c.html#SP5">&#167;5</a>, <a href="4-i6c.html#SP6">&#167;6</a>, <a href="4-i6c.html#SP7">&#167;7</a>, <a href="4-i6c.html#SP8">&#167;8</a>, <a href="4-i6c.html#SP9">&#167;9</a><br/>Inform 6 Global Variables - <a href="4-i6gv.html#SP2_1">&#167;2.1</a>, <a href="4-i6gv.html#SP2_2">&#167;2.2</a>, <a href="4-i6gv.html#SP2_3">&#167;2.3</a>, <a href="4-i6gv.html#SP2_4">&#167;2.4</a>, <a href="4-i6gv.html#SP3">&#167;3</a><br/>Inform 6 Objects - <a href="4-i6o.html#SP4_3">&#167;4.3</a>, <a href="4-i6o.html#SP4_4">&#167;4.4</a>, <a href="4-i6o.html#SP4_5">&#167;4.5</a>, <a href="4-i6o.html#SP4_6">&#167;4.6</a>, <a href="4-i6o.html#SP5_1">&#167;5.1</a>, <a href="4-i6o.html#SP6">&#167;6</a>, <a href="4-i6o.html#SP9">&#167;9</a>, <a href="4-i6o.html#SP10">&#167;10</a>, <a href="4-i6o.html#SP11">&#167;11</a>, <a href="4-i6o.html#SP13_1">&#167;13.1</a>, <a href="4-i6o.html#SP13_2">&#167;13.2</a>, <a href="4-i6o.html#SP13_3">&#167;13.3</a><br/>Inform 6 Code - <a href="4-i6c2.html#SP2">&#167;2</a>, <a href="4-i6c2.html#SP3">&#167;3</a>, <a href="4-i6c2.html#SP4">&#167;4</a>, <a href="4-i6c2.html#SP5">&#167;5</a>, <a href="4-i6c2.html#SP6">&#167;6</a>, <a href="4-i6c2.html#SP6_4">&#167;6.4</a>, <a href="4-i6c2.html#SP9">&#167;9</a><br/>Final C - <a href="5-fnc.html#SP5_2">&#167;5.2</a>, <a href="5-fnc.html#SP5_3">&#167;5.3</a>, <a href="5-fnc.html#SP6_1">&#167;6.1</a><br/>C Namespace - <a href="5-cnm.html#SP7">&#167;7</a><br/>C References - <a href="5-crf.html#SP2">&#167;2</a><br/>C Global Variables - <a href="5-cgv.html#SP2">&#167;2</a>, <a href="5-cgv.html#SP3">&#167;3</a>, <a href="5-cgv.html#SP3_1">&#167;3.1</a>, <a href="5-cgv.html#SP3_2">&#167;3.2</a>, <a href="5-cgv.html#SP3_3">&#167;3.3</a>, <a href="5-cgv.html#SP3_4">&#167;3.4</a>, <a href="5-cgv.html#SP4">&#167;4</a>, <a href="5-cgv.html#SP5">&#167;5</a><br/>C Memory Model - <a href="5-cmm.html#SP2">&#167;2</a>, <a href="5-cmm.html#SP3">&#167;3</a>, <a href="5-cmm.html#SP4_2_2">&#167;4.2.2</a>, <a href="5-cmm.html#SP5">&#167;5</a>, <a href="5-cmm.html#SP6">&#167;6</a>, <a href="5-cmm.html#SP7">&#167;7</a><br/>C Assembly - <a href="5-cas.html#SP5_2">&#167;5.2</a>, <a href="5-cas.html#SP6">&#167;6</a>, <a href="5-cas.html#SP7">&#167;7</a><br/>C Arithmetic - <a href="5-car.html#SP1">&#167;1</a><br/>C Program Control - <a href="5-cpc.html#SP1">&#167;1</a>, <a href="5-cpc.html#SP2">&#167;2</a>, <a href="5-cpc.html#SP2_12">&#167;2.12</a><br/>C Conditions - <a href="5-ccn.html#SP1">&#167;1</a>, <a href="5-ccn.html#SP2">&#167;2</a><br/>C Literals - <a href="5-clt.html#SP2">&#167;2</a>, <a href="5-clt.html#SP3">&#167;3</a>, <a href="5-clt.html#SP4">&#167;4</a>, <a href="5-clt.html#SP5">&#167;5</a>, <a href="5-clt.html#SP7">&#167;7</a>, <a href="5-clt.html#SP8">&#167;8</a>, <a href="5-clt.html#SP10">&#167;10</a><br/>C Object Model - <a href="5-com.html#SP2">&#167;2</a>, <a href="5-com.html#SP4">&#167;4</a>, <a href="5-com.html#SP7">&#167;7</a>, <a href="5-com.html#SP10">&#167;10</a>, <a href="5-com.html#SP13">&#167;13</a>, <a href="5-com.html#SP16">&#167;16</a>, <a href="5-com.html#SP17">&#167;17</a>, <a href="5-com.html#SP20_1">&#167;20.1</a>, <a href="5-com.html#SP20_3">&#167;20.3</a>, <a href="5-com.html#SP24">&#167;24</a>, <a href="5-com.html#SP26">&#167;26</a>, <a href="5-com.html#SP34">&#167;34</a><br/>C Function Model - <a href="5-cfm.html#SP2">&#167;2</a>, <a href="5-cfm.html#SP4">&#167;4</a>, <a href="5-cfm.html#SP5">&#167;5</a>, <a href="5-cfm.html#SP6">&#167;6</a>, <a href="5-cfm.html#SP8">&#167;8</a>, <a href="5-cfm.html#SP10">&#167;10</a>, <a href="5-cfm.html#SP11">&#167;11</a>, <a href="5-cfm.html#SP12">&#167;12</a>, <a href="5-cfm.html#SP14_1">&#167;14.1</a>, <a href="5-cfm.html#SP14_2">&#167;14.2</a>, <a href="5-cfm.html#SP14_3">&#167;14.3</a>, <a href="5-cfm.html#SP15">&#167;15</a><br/>C Input-Output Model - <a href="5-cim.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</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">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">temporarily_diverted</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="identifier-syntax">temporarily_diverted_to</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">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">pos</span><span class="plain-syntax">.</span><span class="element-syntax">current_segment</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>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">pos</span><span class="plain-syntax">.</span><span class="identifier-syntax">current_segment</span><span class="plain-syntax">-&gt;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">generated_code</span><span class="plain-syntax">[</span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">pos</span><span class="plain-syntax">.</span><span class="element-syntax">current_layer</span><span class="plain-syntax">];</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP15" class="paragraph-anchor"></a><b>&#167;15. </b>And then all we do is concatenate them in order:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::write_segments</span><button class="popup" onclick="togglePopup('usagePopup16')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup16">Usage of <span class="code-font"><span class="function-syntax">CodeGen::write_segments</span></span>:<br/>Code Generators - <a href="2-cg2.html#SP4">&#167;4</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax"> *</span><span class="identifier-syntax">seg</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">seg</span><span class="plain-syntax">, </span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">segment_sequence</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><a href="2-cg.html#SP15" class="function-link"><span class="function-syntax">CodeGen::write_segment</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">seg</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::write_additional_segments</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax"> *</span><span class="identifier-syntax">seg</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">seg</span><span class="plain-syntax">, </span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">segmentation</span><span class="plain-syntax">.</span><span class="element-syntax">additional_segment_sequence</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><a href="2-cg.html#SP15" class="function-link"><span class="function-syntax">CodeGen::write_segment</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">seg</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::write_segment</span><button class="popup" onclick="togglePopup('usagePopup17')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup17">Usage of <span class="code-font"><span class="function-syntax">CodeGen::write_segment</span></span>:<br/>Final C - <a href="5-fnc.html#SP6_2">&#167;6.2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">generated_segment</span><span class="plain-syntax"> *</span><span class="identifier-syntax">seg</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="function-syntax">&lt;seg-&gt;</span><span class="element-syntax">layers</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">seg</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">generated_code</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP16" class="paragraph-anchor"></a><b>&#167;16. Transients. </b>Transient flags on symbols are used temporarily during code generation, but do
not change the meaning of the tree: they're just a way to keep track of, say,
what we've worked on so far.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::clear_all_transients</span><button class="popup" onclick="togglePopup('usagePopup18')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup18">Usage of <span class="code-font"><span class="function-syntax">CodeGen::clear_all_transients</span></span>:<br/>Code Generators - <a href="2-cg2.html#SP4">&#167;4</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="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="2-cg.html#SP16" class="function-link"><span class="function-syntax">CodeGen::clear_transients</span></a><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</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="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::clear_transients</span><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>
<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">PackageInstruction::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_symbols_table</span><span class="plain-syntax"> *</span><span class="identifier-syntax">T</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>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_SYMBOLS_TABLE</span><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">T</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">InterSymbol::clear_transient_flags</span><span class="plain-syntax">(</span><span class="identifier-syntax">S</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP17" class="paragraph-anchor"></a><b>&#167;17. </b>In particular the <span class="extract"><span class="extract-syntax">TRAVERSE_MARK_ISYMF</span></span> flag is sometimes convenient to use.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::marked</span><button class="popup" onclick="togglePopup('usagePopup19')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup19">Usage of <span class="code-font"><span class="function-syntax">CodeGen::marked</span></span>:<br/>Vanilla Objects - <a href="2-vo.html#SP4_1_1_1">&#167;4.1.1.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">symb_name</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">InterSymbol::get_flag</span><span class="plain-syntax">(</span><span class="identifier-syntax">symb_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRAVERSE_MARK_ISYMF</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::mark</span><button class="popup" onclick="togglePopup('usagePopup20')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup20">Usage of <span class="code-font"><span class="function-syntax">CodeGen::mark</span></span>:<br/>Vanilla Objects - <a href="2-vo.html#SP4_1_1_1">&#167;4.1.1.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">symb_name</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">InterSymbol::set_flag</span><span class="plain-syntax">(</span><span class="identifier-syntax">symb_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRAVERSE_MARK_ISYMF</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::unmark</span><button class="popup" onclick="togglePopup('usagePopup21')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup21">Usage of <span class="code-font"><span class="function-syntax">CodeGen::unmark</span></span>:<br/>Vanilla Objects - <a href="2-vo.html#SP4_1">&#167;4.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">symb_name</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">InterSymbol::clear_flag</span><span class="plain-syntax">(</span><span class="identifier-syntax">symb_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRAVERSE_MARK_ISYMF</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP18" class="paragraph-anchor"></a><b>&#167;18. Value pairs. </b>We will very often need to compile an expression from a pair <span class="extract"><span class="extract-syntax">val1</span></span>, <span class="extract"><span class="extract-syntax">val2</span></span>
extracted from some Inter instruction.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::pair_at_bookmark</span><button class="popup" onclick="togglePopup('usagePopup22')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup22">Usage of <span class="code-font"><span class="function-syntax">CodeGen::pair_at_bookmark</span></span>:<br/><a href="2-cg.html#SP6">&#167;6</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_pair</span><span class="plain-syntax"> </span><span class="identifier-syntax">val</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbols_table</span><span class="plain-syntax"> *</span><span class="identifier-syntax">T</span><span class="plain-syntax"> = </span><span class="identifier-syntax">IBM</span><span class="plain-syntax">?(</span><span class="identifier-syntax">InterBookmark::scope</span><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">)):</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-cg.html#SP18_1" class="named-paragraph-link"><span class="named-paragraph">Generate from a value pair</span><span class="named-paragraph-number">18.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CodeGen::pair</span><button class="popup" onclick="togglePopup('usagePopup23')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup23">Usage of <span class="code-font"><span class="function-syntax">CodeGen::pair</span></span>:<br/>Vanilla Constants - <a href="2-vc.html#SP1_6">&#167;1.6</a>, <a href="2-vc.html#SP2">&#167;2</a><br/>Vanilla Objects - <a href="2-vo.html#SP4_1_1_1_1_1_1">&#167;4.1.1.1.1.1.1</a><br/>Vanilla Code - <a href="2-vc2.html#SP4">&#167;4</a><br/>Inform 6 Constants - <a href="4-i6c.html#SP3_1">&#167;3.1</a><br/>Inform 6 Global Variables - <a href="4-i6gv.html#SP2_2">&#167;2.2</a>, <a href="4-i6gv.html#SP2_4">&#167;2.4</a><br/>Inform 6 Objects - <a href="4-i6o.html#SP11">&#167;11</a><br/>C Global Variables - <a href="5-cgv.html#SP3_4">&#167;3.4</a><br/>C Object Model - <a href="5-com.html#SP21">&#167;21</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</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="identifier-syntax">inter_pair</span><span class="plain-syntax"> </span><span class="identifier-syntax">val</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbols_table</span><span class="plain-syntax"> *</span><span class="identifier-syntax">T</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">?(</span><span class="identifier-syntax">InterPackage::scope_of</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">)):</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-cg.html#SP18_1" class="named-paragraph-link"><span class="named-paragraph">Generate from a value pair</span><span class="named-paragraph-number">18.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP18_1" class="paragraph-anchor"></a><b>&#167;18.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Generate from a value pair</span><span class="named-paragraph-number">18.1</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<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">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">from</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP14" class="function-link"><span class="function-syntax">CodeGen::current</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</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">InterValuePairs::is_symbolic</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</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">s</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterValuePairs::to_symbol</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">, </span><span class="identifier-syntax">T</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">s</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">"bad symbol in Inter pair"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-cg2.html#SP19" class="function-link"><span class="function-syntax">Generators::compile_literal_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">s</span><span class="plain-syntax">);</span>
<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">InterValuePairs::is_number</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><a href="2-cg2.html#SP19" class="function-link"><span class="function-syntax">Generators::compile_literal_number</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">InterValuePairs::to_number</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">), </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
<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">InterValuePairs::is_real</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><a href="2-cg2.html#SP19" class="function-link"><span class="function-syntax">Generators::compile_literal_real</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">InterValuePairs::to_textual_real</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">));</span>
<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">InterValuePairs::is_singular_dword</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><a href="2-cg2.html#SP19" class="function-link"><span class="function-syntax">Generators::compile_dictionary_word</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">InterValuePairs::to_dictionary_word</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">), </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
<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">InterValuePairs::is_plural_dword</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><a href="2-cg2.html#SP19" class="function-link"><span class="function-syntax">Generators::compile_dictionary_word</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">InterValuePairs::to_dictionary_word</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">), </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">);</span>
<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">InterValuePairs::is_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><a href="2-cg2.html#SP19" class="function-link"><span class="function-syntax">Generators::compile_literal_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">InterValuePairs::to_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">), </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">);</span>
<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">InterValuePairs::is_glob</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">InterValuePairs::to_glob_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</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">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"unimplemented data pair format"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-cg.html#SP18">&#167;18</a> (twice).</li></ul>
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