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<!--Weave of 'Load Binary Kits Stage' generated by Inweb-->
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inter Modules</a></li><li><a href="index.html">pipeline</a></li><li><a href="index.html#4">Chapter 4: Linking Stages</a></li><li><b>Load Binary Kits Stage</b></li></ul></div>
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<p class="purpose">Reading other Inter trees as binary files, and attaching them at given points in the main Inter tree.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Linking is not a symmetrical process: one Inter tree remains the primary one —
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usually this will be the tree still in memory which was compiled by Inform 7
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from source text. That needs to be linked to Inter from, for example, kits
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such as <span class="extract"><span class="extract-syntax">WorldModelKit</span></span>. This is a non-trivial process, but begins easily
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enough, with each of those secondary Inter trees in turn being read in from
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a binary Inter file, and then attached to (i.e., made part of) the primary tree.
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</p>
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<p class="commentary">The primary tree cannot "know", of itself, where these secondary trees will
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live in the file system, so the <span class="extract"><span class="extract-syntax">load-binary-kits</span></span> stage needs to be given instructions
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on the side. This is done with the "requirements list" of the step.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">LoadBinaryKitsStage::create_pipeline_stage</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">LoadBinaryKitsStage::create_pipeline_stage</span></span>:<br/>Parsing Pipelines - <a href="2-pp.html#SP10">§10</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="2-pp.html#SP3" class="function-link"><span class="function-syntax">ParsingPipelines::new_stage</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"load-binary-kits"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><a href="4-lbks.html#SP1" class="function-link"><span class="function-syntax">LoadBinaryKitsStage::run</span></a><span class="plain-syntax">, </span><span class="constant-syntax">NO_STAGE_ARG</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">LoadBinaryKitsStage::run</span><span class="plain-syntax">(</span><span class="reserved-syntax">pipeline_step</span><span class="plain-syntax"> *</span><span class="identifier-syntax">step</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">attachment_instruction</span><span class="plain-syntax"> *</span><span class="identifier-syntax">req</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">req</span><span class="plain-syntax">, </span><span class="reserved-syntax">attachment_instruction</span><span class="plain-syntax">, </span><span class="identifier-syntax">step</span><span class="plain-syntax">-></span><span class="element-syntax">ephemera</span><span class="plain-syntax">.</span><span class="element-syntax">requirements_list</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_architecture</span><span class="plain-syntax"> *</span><span class="identifier-syntax">A</span><span class="plain-syntax"> = </span><a href="1-pm.html#SP4" class="function-link"><span class="function-syntax">PipelineModule::get_architecture</span></a><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">A</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">Errors::fatal</span><span class="plain-syntax">(</span><span class="string-syntax">"no -architecture given"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">arch_file</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Architectures::canonical_binary</span><span class="plain-syntax">(</span><span class="identifier-syntax">req</span><span class="plain-syntax">-></span><span class="element-syntax">location</span><span class="plain-syntax">, </span><span class="identifier-syntax">A</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">TextFiles::exists</span><span class="plain-syntax">(</span><span class="identifier-syntax">arch_file</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no arch file for requirement"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sidecar</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterTree::new</span><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Inter::Binary::test_file</span><span class="plain-syntax">(</span><span class="identifier-syntax">arch_file</span><span class="plain-syntax">)) </span><span class="identifier-syntax">Inter::Binary::read</span><span class="plain-syntax">(</span><span class="identifier-syntax">sidecar</span><span class="plain-syntax">, </span><span class="identifier-syntax">arch_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">Inter::Textual::read</span><span class="plain-syntax">(</span><span class="identifier-syntax">sidecar</span><span class="plain-syntax">, </span><span class="identifier-syntax">arch_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pack</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Inter::Packages::by_url</span><span class="plain-syntax">(</span><span class="identifier-syntax">sidecar</span><span class="plain-syntax">, </span><span class="identifier-syntax">req</span><span class="plain-syntax">-></span><span class="element-syntax">attachment_point</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">pack</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">STDERR</span><span class="plain-syntax">, </span><span class="string-syntax">"sought attachment material at: %S in %f\n"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">req</span><span class="plain-syntax">-></span><span class="element-syntax">attachment_point</span><span class="plain-syntax">, </span><span class="identifier-syntax">arch_file</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"unable to find attachment point package"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Inter::Transmigration::move</span><span class="plain-syntax">(</span><span class="identifier-syntax">pack</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Site::main_package</span><span class="plain-syntax">(</span><span class="identifier-syntax">step</span><span class="plain-syntax">-></span><span class="element-syntax">ephemera</span><span class="plain-syntax">.</span><span class="element-syntax">repository</span><span class="plain-syntax">), </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>And this function is useful when building a requirements list, which is just
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a linked list of //attachment_instruction//s.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">attachment_instruction</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">location</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">attachment_point</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">attachment_instruction</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">attachment_instruction</span><span class="plain-syntax"> *</span><span class="function-syntax">LoadBinaryKitsStage::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">attach</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">attachment_instruction</span><span class="plain-syntax"> *</span><span class="identifier-syntax">link</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">attachment_instruction</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">link</span><span class="plain-syntax">-></span><span class="identifier-syntax">location</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">link</span><span class="plain-syntax">-></span><span class="identifier-syntax">attachment_point</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">attach</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">link</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<ul class="endnotetexts"><li>The structure attachment_instruction is private to this section.</li></ul>
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