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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>Transmigration</title>
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<!--Weave of 'Transmigration' generated by 7-->
<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">bytecode</a></li><li><a href="index.html#2">Chapter 2: Interoperability</a></li><li><b>Transmigration</b></li></ul><p class="purpose">To move packages between repositories.</p>
<p class="inwebparagraph"><a id="SP1"></a><b>&#167;1. </b></p>
<pre class="display">
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">ipct_cache_count</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">;</span>
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Inter::Transmigration::cache<button class="popup" onclick="togglePopup('usagePopup230')">...<span class="popuptext" id="usagePopup230">Usage of <b>Inter::Transmigration::cache</b>:<br><a href="#SP3">&#167;3</a>, <a href="#SP3_1">&#167;3.1</a>, <a href="#SP3_2">&#167;3.2</a>, <a href="#SP3_3">&#167;3.3</a>, <a href="#SP4_1">&#167;4.1</a></span></button></span><span class="plain">(</span><span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">S</span><span class="plain">, </span><span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">V</span><span class="plain">) {</span>
<span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">linked_to</span><span class="plain"> = </span><span class="identifier">V</span><span class="plain">;</span>
<span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">link_time</span><span class="plain"> = </span><span class="identifier">ipct_cache_count</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="functiontext">Inter::Transmigration::cached_equivalent<button class="popup" onclick="togglePopup('usagePopup231')">...<span class="popuptext" id="usagePopup231">Usage of <b>Inter::Transmigration::cached_equivalent</b>:<br><a href="#SP3">&#167;3</a>, <a href="#SP3_1">&#167;3.1</a>, <a href="#SP3_2">&#167;3.2</a>, <a href="#SP3_3">&#167;3.3</a>, <a href="#SP4_1">&#167;4.1</a></span></button></span><span class="plain">(</span><span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">S</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">link_time</span><span class="plain"> == </span><span class="identifier">ipct_cache_count</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">linked_to</span><span class="plain">;</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Inter::Transmigration::move<button class="popup" onclick="togglePopup('usagePopup232')">...<span class="popuptext" id="usagePopup232">Usage of <b>Inter::Transmigration::move</b>:<br>none</span></button></span><span class="plain">(</span><span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">migrant</span><span class="plain">, </span><span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">destination</span><span class="plain">, </span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">tidy_origin</span><span class="plain">) {</span>
<span class="reserved">inter_tree</span><span class="plain"> *</span><span class="identifier">origin_tree</span><span class="plain"> = </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::tree</a></span><span class="plain">(</span><span class="identifier">migrant</span><span class="plain">);</span>
<span class="reserved">inter_tree</span><span class="plain"> *</span><span class="identifier">destination_tree</span><span class="plain"> = </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::tree</a></span><span class="plain">(</span><span class="identifier">destination</span><span class="plain">);</span>
<span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">origin</span><span class="plain"> = </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::parent</a></span><span class="plain">(</span><span class="identifier">migrant</span><span class="plain">);</span>
<span class="reserved">inter_bookmark</span><span class="plain"> </span><span class="identifier">deletion_point</span><span class="plain">, </span><span class="identifier">insertion_point</span><span class="plain">, </span><span class="identifier">primitives_point</span><span class="plain">, </span><span class="identifier">ptypes_point</span><span class="plain">;</span>
&lt;<span class="cwebmacro">Create these bookmarks</span> <span class="cwebmacronumber">1.1</span>&gt;<span class="plain">;</span>
&lt;<span class="cwebmacro">Mark the insertion and deletion points with comments</span> <span class="cwebmacronumber">1.2</span>&gt;<span class="plain">;</span>
&lt;<span class="cwebmacro">Physically move the subtree to its new home</span> <span class="cwebmacronumber">1.3</span>&gt;<span class="plain">;</span>
&lt;<span class="cwebmacro">Correct any references from the migrant to the origin</span> <span class="cwebmacronumber">1.4</span>&gt;<span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">tidy_origin</span><span class="plain">) </span>&lt;<span class="cwebmacro">Correct any references from the origin to the migrant</span> <span class="cwebmacronumber">1.5</span>&gt;<span class="plain">;</span>
<span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">connectors</span><span class="plain"> = </span><span class="identifier">Site::connectors_package</span><span class="plain">(</span><span class="identifier">origin_tree</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">connectors</span><span class="plain">) {</span>
<span class="reserved">inter_symbols_table</span><span class="plain"> *</span><span class="identifier">T</span><span class="plain"> = </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::scope</a></span><span class="plain">(</span><span class="identifier">connectors</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">T</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"package with no symbols"</span><span class="plain">);</span>
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">i</span><span class="plain">=0; </span><span class="identifier">i</span><span class="plain">&lt;</span><span class="identifier">T</span><span class="plain">-&gt;</span><span class="element">size</span><span class="plain">; </span><span class="identifier">i</span><span class="plain">++) {</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">symb</span><span class="plain"> = </span><span class="identifier">T</span><span class="plain">-&gt;</span><span class="element">symbol_array</span><span class="plain">[</span><span class="identifier">i</span><span class="plain">];</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">symb</span><span class="plain">) &amp;&amp; (</span><span class="functiontext"><a href="2-sym.html#SP2">Inter::Symbols::get_scope</a></span><span class="plain">(</span><span class="identifier">symb</span><span class="plain">) == </span><span class="constant">SOCKET_ISYMS</span><span class="plain">)) {</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">target</span><span class="plain"> = </span><span class="identifier">symb</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">;</span>
<span class="reserved">while</span><span class="plain"> (</span><span class="identifier">target</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">) </span><span class="identifier">target</span><span class="plain"> = </span><span class="identifier">target</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">;</span>
<span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">target_package</span><span class="plain"> = </span><span class="identifier">target</span><span class="plain">-&gt;</span><span class="element">owning_table</span><span class="plain">-&gt;</span><span class="element">owning_package</span><span class="plain">;</span>
<span class="reserved">while</span><span class="plain"> ((</span><span class="identifier">target_package</span><span class="plain">) &amp;&amp; (</span><span class="identifier">target_package</span><span class="plain"> != </span><span class="identifier">migrant</span><span class="plain">)) {</span>
<span class="identifier">target_package</span><span class="plain"> = </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::parent</a></span><span class="plain">(</span><span class="identifier">target_package</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">target_package</span><span class="plain"> == </span><span class="identifier">migrant</span><span class="plain">) {</span>
<span class="identifier">LOGIF</span><span class="plain">(</span><span class="identifier">INTER_CONNECTORS</span><span class="plain">, </span><span class="string">"Origin offers socket inside migrant: $3 == $3\n"</span><span class="plain">, </span><span class="identifier">symb</span><span class="plain">, </span><span class="identifier">target</span><span class="plain">);</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">equivalent</span><span class="plain"> = </span><span class="functiontext"><a href="2-cnn.html#SP1">Inter::Connectors::find_socket</a></span><span class="plain">(</span><span class="identifier">destination_tree</span><span class="plain">, </span><span class="identifier">symb</span><span class="plain">-&gt;</span><span class="element">symbol_name</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">equivalent</span><span class="plain">) {</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">e_target</span><span class="plain"> = </span><span class="identifier">equivalent</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">;</span>
<span class="reserved">while</span><span class="plain"> (</span><span class="identifier">e_target</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">) </span><span class="identifier">e_target</span><span class="plain"> = </span><span class="identifier">e_target</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (!</span><span class="functiontext"><a href="2-sym.html#SP4">Inter::Symbols::is_defined</a></span><span class="plain">(</span><span class="identifier">e_target</span><span class="plain">)) {</span>
<span class="identifier">LOGIF</span><span class="plain">(</span><span class="identifier">INTER_CONNECTORS</span><span class="plain">, </span><span class="string">"Able to match with $3 == $3\n"</span><span class="plain">, </span><span class="identifier">equivalent</span><span class="plain">, </span><span class="identifier">equivalent</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">);</span>
<span class="identifier">equivalent</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain"> = </span><span class="identifier">target</span><span class="plain">;</span>
<span class="identifier">e_target</span><span class="plain">-&gt;</span><span class="identifier">equated_to</span><span class="plain"> = </span><span class="identifier">target</span><span class="plain">;</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
<span class="identifier">LOGIF</span><span class="plain">(</span><span class="identifier">INTER_CONNECTORS</span><span class="plain">, </span><span class="string">"Clash of sockets\n"</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
<span class="functiontext"><a href="2-cnn.html#SP1">Inter::Connectors::socket</a></span><span class="plain">(</span><span class="identifier">destination_tree</span><span class="plain">, </span><span class="identifier">symb</span><span class="plain">-&gt;</span><span class="element">symbol_name</span><span class="plain">, </span><span class="identifier">symb</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP_1"></a><b>&#167;.1. </b><code class="display">
&lt;<span class="cwebmacrodefn">Log sockets in origin tree</span> <span class="cwebmacronumber">.1</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">LOG</span><span class="plain">(</span><span class="string">"\n\n\nList of sockets in origin tree:\n"</span><span class="plain">);</span>
<span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">connectors</span><span class="plain"> = </span><span class="identifier">Site::connectors_package</span><span class="plain">(</span><span class="identifier">origin_tree</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">connectors</span><span class="plain">) {</span>
<span class="reserved">inter_symbols_table</span><span class="plain"> *</span><span class="identifier">T</span><span class="plain"> = </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::scope</a></span><span class="plain">(</span><span class="identifier">connectors</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">T</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"package with no symbols"</span><span class="plain">);</span>
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">i</span><span class="plain">=0; </span><span class="identifier">i</span><span class="plain">&lt;</span><span class="identifier">T</span><span class="plain">-&gt;</span><span class="element">size</span><span class="plain">; </span><span class="identifier">i</span><span class="plain">++) {</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">symb</span><span class="plain"> = </span><span class="identifier">T</span><span class="plain">-&gt;</span><span class="element">symbol_array</span><span class="plain">[</span><span class="identifier">i</span><span class="plain">];</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">symb</span><span class="plain">) &amp;&amp; (</span><span class="functiontext"><a href="2-sym.html#SP2">Inter::Symbols::get_scope</a></span><span class="plain">(</span><span class="identifier">symb</span><span class="plain">) == </span><span class="constant">SOCKET_ISYMS</span><span class="plain">)) {</span>
<span class="identifier">LOG</span><span class="plain">(</span><span class="string">"$3\n"</span><span class="plain">, </span><span class="identifier">symb</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="identifier">LOG</span><span class="plain">(</span><span class="string">"---\n\n"</span><span class="plain">);</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is never used.</p>
<p class="inwebparagraph"><a id="SP1_1"></a><b>&#167;1.1. </b><code class="display">
&lt;<span class="cwebmacrodefn">Create these bookmarks</span> <span class="cwebmacronumber">1.1</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">deletion_point</span><span class="plain"> =</span>
<span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::after_this_node</a></span><span class="plain">(</span><span class="identifier">migrant</span><span class="plain">-&gt;</span><span class="element">package_head</span><span class="plain">-&gt;</span><span class="element">tree</span><span class="plain">, </span><span class="identifier">migrant</span><span class="plain">-&gt;</span><span class="element">package_head</span><span class="plain">);</span>
<span class="identifier">insertion_point</span><span class="plain"> =</span>
<span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::at_end_of_this_package</a></span><span class="plain">(</span><span class="identifier">destination</span><span class="plain">);</span>
<span class="reserved">inter_tree_node</span><span class="plain"> *</span><span class="identifier">prims</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="identifier">LOOP_THROUGH_INTER_CHILDREN</span><span class="plain">(</span><span class="identifier">F</span><span class="plain">, </span><span class="identifier">destination</span><span class="plain">-&gt;</span><span class="element">package_head</span><span class="plain">-&gt;</span><span class="element">tree</span><span class="plain">-&gt;</span><span class="element">root_node</span><span class="plain">)</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">F</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[</span><span class="constant">ID_IFLD</span><span class="plain">] == </span><span class="constant">PRIMITIVE_IST</span><span class="plain">)</span>
<span class="identifier">prims</span><span class="plain"> = </span><span class="identifier">F</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">prims</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"dest has no prims"</span><span class="plain">);</span>
<span class="identifier">primitives_point</span><span class="plain"> = </span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::after_this_node</a></span><span class="plain">(</span><span class="identifier">destination</span><span class="plain">-&gt;</span><span class="element">package_head</span><span class="plain">-&gt;</span><span class="element">tree</span><span class="plain">, </span><span class="identifier">prims</span><span class="plain">);</span>
<span class="reserved">inter_tree_node</span><span class="plain"> *</span><span class="identifier">ptypes</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="identifier">LOOP_THROUGH_INTER_CHILDREN</span><span class="plain">(</span><span class="identifier">F</span><span class="plain">, </span><span class="identifier">destination</span><span class="plain">-&gt;</span><span class="element">package_head</span><span class="plain">-&gt;</span><span class="element">tree</span><span class="plain">-&gt;</span><span class="element">root_node</span><span class="plain">)</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">F</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[</span><span class="constant">ID_IFLD</span><span class="plain">] == </span><span class="constant">PACKAGETYPE_IST</span><span class="plain">)</span>
<span class="identifier">ptypes</span><span class="plain"> = </span><span class="identifier">F</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">ptypes</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"dest has no prims"</span><span class="plain">);</span>
<span class="identifier">ptypes_point</span><span class="plain"> = </span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::after_this_node</a></span><span class="plain">(</span><span class="identifier">destination</span><span class="plain">-&gt;</span><span class="element">package_head</span><span class="plain">-&gt;</span><span class="element">tree</span><span class="plain">, </span><span class="identifier">ptypes</span><span class="plain">);</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP1">&#167;1</a>.</p>
<p class="inwebparagraph"><a id="SP1_2"></a><b>&#167;1.2. </b><code class="display">
&lt;<span class="cwebmacrodefn">Mark the insertion and deletion points with comments</span> <span class="cwebmacronumber">1.2</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="constant">inter_t</span><span class="plain"> </span><span class="identifier">C1</span><span class="plain"> = </span><span class="functiontext"><a href="2-tw.html#SP3">Inter::Warehouse::create_text</a></span><span class="plain">(</span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::warehouse</a></span><span class="plain">(&amp;</span><span class="identifier">deletion_point</span><span class="plain">), </span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::package</a></span><span class="plain">(&amp;</span><span class="identifier">deletion_point</span><span class="plain">));</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="functiontext"><a href="2-tw.html#SP3">Inter::Warehouse::get_text</a></span><span class="plain">(</span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::warehouse</a></span><span class="plain">(&amp;</span><span class="identifier">deletion_point</span><span class="plain">), </span><span class="identifier">C1</span><span class="plain">),</span>
<span class="string">"Exported %S here"</span><span class="plain">, </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::name</a></span><span class="plain">(</span><span class="identifier">migrant</span><span class="plain">));</span>
<span class="functiontext"><a href="4-tcc.html#SP1">Inter::Comment::new</a></span><span class="plain">(&amp;</span><span class="identifier">deletion_point</span><span class="plain">, (</span><span class="constant">inter_t</span><span class="plain">) </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::baseline</a></span><span class="plain">(</span><span class="identifier">migrant</span><span class="plain">), </span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">C1</span><span class="plain">);</span>
<span class="constant">inter_t</span><span class="plain"> </span><span class="identifier">C2</span><span class="plain"> = </span><span class="functiontext"><a href="2-tw.html#SP3">Inter::Warehouse::create_text</a></span><span class="plain">(</span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::warehouse</a></span><span class="plain">(&amp;</span><span class="identifier">insertion_point</span><span class="plain">), </span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::package</a></span><span class="plain">(&amp;</span><span class="identifier">insertion_point</span><span class="plain">));</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="functiontext"><a href="2-tw.html#SP3">Inter::Warehouse::get_text</a></span><span class="plain">(</span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::warehouse</a></span><span class="plain">(&amp;</span><span class="identifier">insertion_point</span><span class="plain">), </span><span class="identifier">C2</span><span class="plain">),</span>
<span class="string">"Imported %S here"</span><span class="plain">, </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::name</a></span><span class="plain">(</span><span class="identifier">migrant</span><span class="plain">));</span>
<span class="functiontext"><a href="4-tcc.html#SP1">Inter::Comment::new</a></span><span class="plain">(&amp;</span><span class="identifier">insertion_point</span><span class="plain">, (</span><span class="constant">inter_t</span><span class="plain">) </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::baseline</a></span><span class="plain">(</span><span class="identifier">destination</span><span class="plain">) + </span><span class="constant">1</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">C2</span><span class="plain">);</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP1">&#167;1</a>.</p>
<p class="inwebparagraph"><a id="SP1_3"></a><b>&#167;1.3. </b><code class="display">
&lt;<span class="cwebmacrodefn">Physically move the subtree to its new home</span> <span class="cwebmacronumber">1.3</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::remove_subpackage_name</a></span><span class="plain">(</span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::parent</a></span><span class="plain">(</span><span class="identifier">migrant</span><span class="plain">), </span><span class="identifier">migrant</span><span class="plain">);</span>
<span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::add_subpackage_name</a></span><span class="plain">(</span><span class="identifier">destination</span><span class="plain">, </span><span class="identifier">migrant</span><span class="plain">);</span>
<span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::insert</a></span><span class="plain">(&amp;</span><span class="identifier">insertion_point</span><span class="plain">, </span><span class="identifier">migrant</span><span class="plain">-&gt;</span><span class="element">package_head</span><span class="plain">);</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP1">&#167;1</a>.</p>
<p class="inwebparagraph"><a id="SP2"></a><b>&#167;2. </b></p>
<pre class="display">
<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">struct</span><span class="plain"> </span><span class="reserved">ipct_state</span><span class="plain"> {</span>
<span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">migrant</span><span class="plain">;</span>
<span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">destination</span><span class="plain">;</span>
<span class="reserved">inter_bookmark</span><span class="plain"> *</span><span class="identifier">primitives_point</span><span class="plain">;</span>
<span class="reserved">inter_bookmark</span><span class="plain"> *</span><span class="identifier">ptypes_point</span><span class="plain">;</span>
<span class="reserved">inter_tree</span><span class="plain"> *</span><span class="identifier">origin_tree</span><span class="plain">;</span>
<span class="reserved">inter_tree</span><span class="plain"> *</span><span class="identifier">destination_tree</span><span class="plain">;</span>
<span class="plain">} </span><span class="reserved">ipct_state</span><span class="plain">;</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The structure ipct_state is private to this section.</p>
<p class="inwebparagraph"><a id="SP_1"></a><b>&#167;.1. </b><code class="display">
&lt;<span class="cwebmacrodefn">Initialise the IPCT state</span> <span class="cwebmacronumber">.1</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">ipct_cache_count</span><span class="plain">++;</span>
<span class="identifier">ipct</span><span class="plain">.</span><span class="element">migrant</span><span class="plain"> = </span><span class="identifier">migrant</span><span class="plain">;</span>
<span class="identifier">ipct</span><span class="plain">.</span><span class="element">destination</span><span class="plain"> = </span><span class="identifier">destination</span><span class="plain">;</span>
<span class="identifier">ipct</span><span class="plain">.</span><span class="element">origin_tree</span><span class="plain"> = </span><span class="identifier">origin_tree</span><span class="plain">;</span>
<span class="identifier">ipct</span><span class="plain">.</span><span class="element">destination_tree</span><span class="plain"> = </span><span class="identifier">destination_tree</span><span class="plain">;</span>
<span class="identifier">ipct</span><span class="plain">.</span><span class="element">primitives_point</span><span class="plain"> = &amp;</span><span class="identifier">primitives_point</span><span class="plain">;</span>
<span class="identifier">ipct</span><span class="plain">.</span><span class="element">ptypes_point</span><span class="plain"> = &amp;</span><span class="identifier">ptypes_point</span><span class="plain">;</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP1_4">&#167;1.4</a>, <a href="#SP1_5">&#167;1.5</a>.</p>
<p class="inwebparagraph"><a id="SP1_4"></a><b>&#167;1.4. </b><code class="display">
&lt;<span class="cwebmacrodefn">Correct any references from the migrant to the origin</span> <span class="cwebmacronumber">1.4</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="reserved">ipct_state</span><span class="plain"> </span><span class="identifier">ipct</span><span class="plain">;</span>
&lt;<span class="cwebmacro">Initialise the IPCT state</span> <span class="cwebmacronumber">.1</span>&gt;<span class="plain">;</span>
<span class="functiontext"><a href="2-it.html#SP5">Inter::Tree::traverse</a></span><span class="plain">(</span><span class="identifier">destination</span><span class="plain">-&gt;</span><span class="element">package_head</span><span class="plain">-&gt;</span><span class="element">tree</span><span class="plain">,</span>
<span class="functiontext"><a href="#SP3">Inter::Transmigration::correct_migrant</a></span><span class="plain">, &amp;</span><span class="identifier">ipct</span><span class="plain">, </span><span class="identifier">migrant</span><span class="plain">, </span><span class="constant">0</span><span class="plain">);</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP1">&#167;1</a>.</p>
<p class="inwebparagraph"><a id="SP3"></a><b>&#167;3. </b></p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Inter::Transmigration::correct_migrant<button class="popup" onclick="togglePopup('usagePopup233')">...<span class="popuptext" id="usagePopup233">Usage of <b>Inter::Transmigration::correct_migrant</b>:<br><a href="#SP1_4">&#167;1.4</a></span></button></span><span class="plain">(</span><span class="reserved">inter_tree</span><span class="plain"> *</span><span class="identifier">I</span><span class="plain">, </span><span class="reserved">inter_tree_node</span><span class="plain"> *</span><span class="identifier">P</span><span class="plain">, </span><span class="reserved">void</span><span class="plain"> *</span><span class="identifier">state</span><span class="plain">) {</span>
<span class="reserved">ipct_state</span><span class="plain"> *</span><span class="identifier">ipct</span><span class="plain"> = (</span><span class="reserved">ipct_state</span><span class="plain"> *) </span><span class="identifier">state</span><span class="plain">;</span>
<span class="identifier">P</span><span class="plain">-&gt;</span><span class="element">tree</span><span class="plain"> = </span><span class="identifier">I</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">P</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="identifier">data</span><span class="plain">[</span><span class="constant">ID_IFLD</span><span class="plain">] == </span><span class="constant">INV_IST</span><span class="plain">) &amp;&amp; (</span><span class="identifier">P</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[</span><span class="constant">METHOD_INV_IFLD</span><span class="plain">] == </span><span class="constant">INVOKED_PRIMITIVE</span><span class="plain">)) {</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">primitive</span><span class="plain"> =</span>
<span class="functiontext"><a href="2-st.html#SP6">Inter::SymbolsTables::symbol_from_id</a></span><span class="plain">(</span><span class="functiontext"><a href="2-it.html#SP2">Inter::Tree::global_scope</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">origin_tree</span><span class="plain">), </span><span class="identifier">P</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[</span><span class="constant">INVOKEE_INV_IFLD</span><span class="plain">]);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">primitive</span><span class="plain">) </span>&lt;<span class="cwebmacro">Correct the reference to this primitive</span> <span class="cwebmacronumber">3.1</span>&gt;<span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">P</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[</span><span class="constant">ID_IFLD</span><span class="plain">] == </span><span class="constant">PACKAGE_IST</span><span class="plain">) {</span>
<span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">pack</span><span class="plain"> = </span><span class="functiontext"><a href="4-tpc3.html#SP2">Inter::Package::defined_by_frame</a></span><span class="plain">(</span><span class="identifier">P</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">pack</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"no package defined here"</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::is_linklike</a></span><span class="plain">(</span><span class="identifier">pack</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain">;</span>
&lt;<span class="cwebmacro">Correct the reference to this package type</span> <span class="cwebmacronumber">3.2</span>&gt;<span class="plain">;</span>
<span class="reserved">inter_symbols_table</span><span class="plain"> *</span><span class="identifier">T</span><span class="plain"> = </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::scope</a></span><span class="plain">(</span><span class="identifier">pack</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">T</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"package with no symbols"</span><span class="plain">);</span>
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">i</span><span class="plain">=0; </span><span class="identifier">i</span><span class="plain">&lt;</span><span class="identifier">T</span><span class="plain">-&gt;</span><span class="element">size</span><span class="plain">; </span><span class="identifier">i</span><span class="plain">++) {</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">symb</span><span class="plain"> = </span><span class="identifier">T</span><span class="plain">-&gt;</span><span class="element">symbol_array</span><span class="plain">[</span><span class="identifier">i</span><span class="plain">];</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">symb</span><span class="plain">) &amp;&amp; (</span><span class="identifier">symb</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">)) {</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">target</span><span class="plain"> = </span><span class="identifier">symb</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">;</span>
<span class="reserved">while</span><span class="plain"> (</span><span class="identifier">target</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">) </span><span class="identifier">target</span><span class="plain"> = </span><span class="identifier">target</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="2-sym.html#SP4">Inter::Symbols::read_annotation</a></span><span class="plain">(</span><span class="identifier">target</span><span class="plain">, </span><span class="constant">VENEER_IANN</span><span class="plain">) &gt; </span><span class="constant">0</span><span class="plain">) {</span>
<span class="identifier">symb</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain"> = </span><span class="identifier">Veneer::find</span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">destination</span><span class="plain">-&gt;</span><span class="element">package_head</span><span class="plain">-&gt;</span><span class="element">tree</span><span class="plain">, </span><span class="identifier">target</span><span class="plain">-&gt;</span><span class="element">symbol_name</span><span class="plain">, </span><span class="identifier">Produce::kind_to_symbol</span><span class="plain">(</span><span class="identifier">NULL</span><span class="plain">));</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> </span><span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="2-sym.html#SP2">Inter::Symbols::get_scope</a></span><span class="plain">(</span><span class="identifier">target</span><span class="plain">) == </span><span class="constant">PLUG_ISYMS</span><span class="plain">) {</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">equivalent</span><span class="plain"> = </span><span class="functiontext"><a href="#SP1">Inter::Transmigration::cached_equivalent</a></span><span class="plain">(</span><span class="identifier">target</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">equivalent</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) {</span>
<span class="identifier">equivalent</span><span class="plain"> = </span><span class="functiontext"><a href="2-cnn.html#SP1">Inter::Connectors::find_plug</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">destination</span><span class="plain">-&gt;</span><span class="element">package_head</span><span class="plain">-&gt;</span><span class="element">tree</span><span class="plain">, </span><span class="identifier">target</span><span class="plain">-&gt;</span><span class="element">equated_name</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">equivalent</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">)</span>
<span class="identifier">equivalent</span><span class="plain"> = </span><span class="functiontext"><a href="2-cnn.html#SP1">Inter::Connectors::plug</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">destination</span><span class="plain">-&gt;</span><span class="element">package_head</span><span class="plain">-&gt;</span><span class="element">tree</span><span class="plain">, </span><span class="identifier">target</span><span class="plain">-&gt;</span><span class="element">equated_name</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP1">Inter::Transmigration::cache</a></span><span class="plain">(</span><span class="identifier">target</span><span class="plain">, </span><span class="identifier">equivalent</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="identifier">symb</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain"> = </span><span class="identifier">equivalent</span><span class="plain">;</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
<span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">target_package</span><span class="plain"> = </span><span class="identifier">target</span><span class="plain">-&gt;</span><span class="element">owning_table</span><span class="plain">-&gt;</span><span class="element">owning_package</span><span class="plain">;</span>
<span class="reserved">while</span><span class="plain"> ((</span><span class="identifier">target_package</span><span class="plain">) &amp;&amp; (</span><span class="identifier">target_package</span><span class="plain"> != </span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">migrant</span><span class="plain">)) {</span>
<span class="identifier">target_package</span><span class="plain"> = </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::parent</a></span><span class="plain">(</span><span class="identifier">target_package</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">target_package</span><span class="plain"> != </span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">migrant</span><span class="plain">)</span>
&lt;<span class="cwebmacro">Correct the reference to this symbol</span> <span class="cwebmacronumber">3.3</span>&gt;<span class="plain">;</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP3_1"></a><b>&#167;3.1. </b><code class="display">
&lt;<span class="cwebmacrodefn">Correct the reference to this primitive</span> <span class="cwebmacronumber">3.1</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">equivalent_primitive</span><span class="plain"> = </span><span class="functiontext"><a href="#SP1">Inter::Transmigration::cached_equivalent</a></span><span class="plain">(</span><span class="identifier">primitive</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">equivalent_primitive</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) {</span>
<span class="identifier">equivalent_primitive</span><span class="plain"> = </span><span class="functiontext"><a href="2-st.html#SP4">Inter::SymbolsTables::symbol_from_name</a></span><span class="plain">(</span><span class="functiontext"><a href="2-it.html#SP2">Inter::Tree::global_scope</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">destination_tree</span><span class="plain">), </span><span class="identifier">primitive</span><span class="plain">-&gt;</span><span class="element">symbol_name</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">equivalent_primitive</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span>&lt;<span class="cwebmacro">Duplicate this primitive</span> <span class="cwebmacronumber">3.1.1</span>&gt;<span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">equivalent_primitive</span><span class="plain">) </span><span class="functiontext"><a href="#SP1">Inter::Transmigration::cache</a></span><span class="plain">(</span><span class="identifier">primitive</span><span class="plain">, </span><span class="identifier">equivalent_primitive</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">equivalent_primitive</span><span class="plain">)</span>
<span class="identifier">P</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[</span><span class="constant">INVOKEE_INV_IFLD</span><span class="plain">] = </span><span class="functiontext"><a href="2-st.html#SP9">Inter::SymbolsTables::id_from_symbol_inner</a></span><span class="plain">(</span><span class="functiontext"><a href="2-it.html#SP2">Inter::Tree::global_scope</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">destination_tree</span><span class="plain">), </span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">equivalent_primitive</span><span class="plain">);</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP3">&#167;3</a>.</p>
<p class="inwebparagraph"><a id="SP3_1_1"></a><b>&#167;3.1.1. </b><code class="display">
&lt;<span class="cwebmacrodefn">Duplicate this primitive</span> <span class="cwebmacronumber">3.1.1</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">equivalent_primitive</span><span class="plain"> = </span><span class="functiontext"><a href="2-st.html#SP4">Inter::SymbolsTables::symbol_from_name_creating</a></span><span class="plain">(</span><span class="functiontext"><a href="2-it.html#SP2">Inter::Tree::global_scope</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">destination_tree</span><span class="plain">), </span><span class="identifier">primitive</span><span class="plain">-&gt;</span><span class="element">symbol_name</span><span class="plain">);</span>
<span class="reserved">inter_tree_node</span><span class="plain"> *</span><span class="identifier">D</span><span class="plain"> = </span><span class="functiontext"><a href="2-in.html#SP4">Inter::Node::fill_1</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">primitives_point</span><span class="plain">, </span><span class="constant">PRIMITIVE_IST</span><span class="plain">, </span><span class="functiontext"><a href="2-st.html#SP9">Inter::SymbolsTables::id_from_symbol_inner</a></span><span class="plain">(</span><span class="functiontext"><a href="2-it.html#SP2">Inter::Tree::global_scope</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">destination_tree</span><span class="plain">), </span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">equivalent_primitive</span><span class="plain">), </span><span class="identifier">NULL</span><span class="plain">, </span><span class="constant">0</span><span class="plain">);</span>
<span class="reserved">inter_tree_node</span><span class="plain"> *</span><span class="identifier">old_D</span><span class="plain"> = </span><span class="identifier">primitive</span><span class="plain">-&gt;</span><span class="element">definition</span><span class="plain">;</span>
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">i</span><span class="plain">=</span><span class="constant">CAT_PRIM_IFLD</span><span class="plain">; </span><span class="identifier">i</span><span class="plain">&lt;</span><span class="identifier">old_D</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">extent</span><span class="plain">; </span><span class="identifier">i</span><span class="plain">++) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="2-in.html#SP5">Inter::Node::extend</a></span><span class="plain">(</span><span class="identifier">D</span><span class="plain">, (</span><span class="constant">inter_t</span><span class="plain">) </span><span class="constant">1</span><span class="plain">) == </span><span class="identifier">FALSE</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"can't extend"</span><span class="plain">);</span>
<span class="identifier">D</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[</span><span class="identifier">i</span><span class="plain">] = </span><span class="identifier">old_D</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[</span><span class="identifier">i</span><span class="plain">];</span>
<span class="plain">}</span>
<span class="reserved">inter_error_message</span><span class="plain"> *</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext"><a href="3-dfn.html#SP4">Inter::Defn::verify_construct</a></span><span class="plain">(</span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::package</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">primitives_point</span><span class="plain">), </span><span class="identifier">D</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">E</span><span class="plain">) {</span>
<span class="functiontext"><a href="3-ie.html#SP1">Inter::Errors::issue</a></span><span class="plain">(</span><span class="identifier">E</span><span class="plain">);</span>
<span class="identifier">equivalent_primitive</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
<span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::insert</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">primitives_point</span><span class="plain">, </span><span class="identifier">D</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP3_1">&#167;3.1</a>.</p>
<p class="inwebparagraph"><a id="SP3_2"></a><b>&#167;3.2. </b><code class="display">
&lt;<span class="cwebmacrodefn">Correct the reference to this package type</span> <span class="cwebmacronumber">3.2</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">original_ptype</span><span class="plain"> =</span>
<span class="functiontext"><a href="2-st.html#SP6">Inter::SymbolsTables::symbol_from_id</a></span><span class="plain">(</span>
<span class="functiontext"><a href="2-it.html#SP2">Inter::Tree::global_scope</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">origin_tree</span><span class="plain">), </span><span class="identifier">P</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[</span><span class="constant">PTYPE_PACKAGE_IFLD</span><span class="plain">]);</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">equivalent_ptype</span><span class="plain"> = </span><span class="functiontext"><a href="#SP1">Inter::Transmigration::cached_equivalent</a></span><span class="plain">(</span><span class="identifier">original_ptype</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">equivalent_ptype</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) {</span>
<span class="identifier">equivalent_ptype</span><span class="plain"> = </span><span class="functiontext"><a href="2-st.html#SP4">Inter::SymbolsTables::symbol_from_name</a></span><span class="plain">(</span><span class="functiontext"><a href="2-it.html#SP2">Inter::Tree::global_scope</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">destination_tree</span><span class="plain">), </span><span class="identifier">original_ptype</span><span class="plain">-&gt;</span><span class="element">symbol_name</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">equivalent_ptype</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span>&lt;<span class="cwebmacro">Duplicate this package type</span> <span class="cwebmacronumber">3.2.1</span>&gt;<span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">equivalent_ptype</span><span class="plain">) </span><span class="functiontext"><a href="#SP1">Inter::Transmigration::cache</a></span><span class="plain">(</span><span class="identifier">original_ptype</span><span class="plain">, </span><span class="identifier">equivalent_ptype</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">equivalent_ptype</span><span class="plain">)</span>
<span class="identifier">P</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[</span><span class="constant">PTYPE_PACKAGE_IFLD</span><span class="plain">] = </span><span class="functiontext"><a href="2-st.html#SP9">Inter::SymbolsTables::id_from_symbol_inner</a></span><span class="plain">(</span><span class="functiontext"><a href="2-it.html#SP2">Inter::Tree::global_scope</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">destination_tree</span><span class="plain">), </span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">equivalent_ptype</span><span class="plain">);</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP3">&#167;3</a>.</p>
<p class="inwebparagraph"><a id="SP3_2_1"></a><b>&#167;3.2.1. </b><code class="display">
&lt;<span class="cwebmacrodefn">Duplicate this package type</span> <span class="cwebmacronumber">3.2.1</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="identifier">equivalent_ptype</span><span class="plain"> = </span><span class="functiontext"><a href="2-st.html#SP4">Inter::SymbolsTables::symbol_from_name_creating</a></span><span class="plain">(</span><span class="functiontext"><a href="2-it.html#SP2">Inter::Tree::global_scope</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">destination_tree</span><span class="plain">), </span><span class="identifier">original_ptype</span><span class="plain">-&gt;</span><span class="element">symbol_name</span><span class="plain">);</span>
<span class="reserved">inter_tree_node</span><span class="plain"> *</span><span class="identifier">D</span><span class="plain"> = </span><span class="functiontext"><a href="2-in.html#SP4">Inter::Node::fill_1</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">ptypes_point</span><span class="plain">, </span><span class="constant">PACKAGETYPE_IST</span><span class="plain">, </span><span class="functiontext"><a href="2-st.html#SP9">Inter::SymbolsTables::id_from_symbol_inner</a></span><span class="plain">(</span><span class="functiontext"><a href="2-it.html#SP2">Inter::Tree::global_scope</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">destination_tree</span><span class="plain">), </span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">equivalent_ptype</span><span class="plain">), </span><span class="identifier">NULL</span><span class="plain">, </span><span class="constant">0</span><span class="plain">);</span>
<span class="reserved">inter_error_message</span><span class="plain"> *</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext"><a href="3-dfn.html#SP4">Inter::Defn::verify_construct</a></span><span class="plain">(</span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::package</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">ptypes_point</span><span class="plain">), </span><span class="identifier">D</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">E</span><span class="plain">) {</span>
<span class="functiontext"><a href="3-ie.html#SP1">Inter::Errors::issue</a></span><span class="plain">(</span><span class="identifier">E</span><span class="plain">);</span>
<span class="identifier">equivalent_ptype</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
<span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::insert</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">ptypes_point</span><span class="plain">, </span><span class="identifier">D</span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP3_2">&#167;3.2</a>.</p>
<p class="inwebparagraph"><a id="SP3_3"></a><b>&#167;3.3. </b><code class="display">
&lt;<span class="cwebmacrodefn">Correct the reference to this symbol</span> <span class="cwebmacronumber">3.3</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">equivalent</span><span class="plain"> = </span><span class="functiontext"><a href="#SP1">Inter::Transmigration::cached_equivalent</a></span><span class="plain">(</span><span class="identifier">target</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">equivalent</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) {</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">URL</span><span class="plain">);</span>
<span class="functiontext"><a href="2-st.html#SP11">Inter::SymbolsTables::symbol_to_url_name</a></span><span class="plain">(</span><span class="identifier">URL</span><span class="plain">, </span><span class="identifier">target</span><span class="plain">);</span>
<span class="identifier">equivalent</span><span class="plain"> = </span><span class="functiontext"><a href="2-st.html#SP11">Inter::SymbolsTables::url_name_to_symbol</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">destination</span><span class="plain">-&gt;</span><span class="element">package_head</span><span class="plain">-&gt;</span><span class="element">tree</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">URL</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">equivalent</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) &amp;&amp; (</span><span class="functiontext"><a href="4-tkc.html#SP2">Inter::Kind::is</a></span><span class="plain">(</span><span class="identifier">target</span><span class="plain">)))</span>
<span class="identifier">equivalent</span><span class="plain"> = </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::search_resources_exhaustively</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">destination</span><span class="plain">-&gt;</span><span class="element">package_head</span><span class="plain">-&gt;</span><span class="element">tree</span><span class="plain">, </span><span class="identifier">target</span><span class="plain">-&gt;</span><span class="element">symbol_name</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">equivalent</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">)</span>
<span class="identifier">equivalent</span><span class="plain"> = </span><span class="functiontext"><a href="2-cnn.html#SP1">Inter::Connectors::plug</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">destination_tree</span><span class="plain">, </span><span class="identifier">URL</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">URL</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP1">Inter::Transmigration::cache</a></span><span class="plain">(</span><span class="identifier">target</span><span class="plain">, </span><span class="identifier">equivalent</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="identifier">symb</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain"> = </span><span class="identifier">equivalent</span><span class="plain">;</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP3">&#167;3</a>.</p>
<p class="inwebparagraph"><a id="SP1_5"></a><b>&#167;1.5. </b><code class="display">
&lt;<span class="cwebmacrodefn">Correct any references from the origin to the migrant</span> <span class="cwebmacronumber">1.5</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="reserved">ipct_state</span><span class="plain"> </span><span class="identifier">ipct</span><span class="plain">;</span>
&lt;<span class="cwebmacro">Initialise the IPCT state</span> <span class="cwebmacronumber">.1</span>&gt;<span class="plain">;</span>
<span class="functiontext"><a href="2-it.html#SP5">Inter::Tree::traverse</a></span><span class="plain">(</span><span class="identifier">origin</span><span class="plain">-&gt;</span><span class="element">package_head</span><span class="plain">-&gt;</span><span class="element">tree</span><span class="plain">,</span>
<span class="functiontext"><a href="#SP4">Inter::Transmigration::correct_origin</a></span><span class="plain">, &amp;</span><span class="identifier">ipct</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">, </span><span class="constant">0</span><span class="plain">);</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP1">&#167;1</a>.</p>
<p class="inwebparagraph"><a id="SP4"></a><b>&#167;4. </b></p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Inter::Transmigration::correct_origin<button class="popup" onclick="togglePopup('usagePopup234')">...<span class="popuptext" id="usagePopup234">Usage of <b>Inter::Transmigration::correct_origin</b>:<br><a href="#SP1_5">&#167;1.5</a></span></button></span><span class="plain">(</span><span class="reserved">inter_tree</span><span class="plain"> *</span><span class="identifier">I</span><span class="plain">, </span><span class="reserved">inter_tree_node</span><span class="plain"> *</span><span class="identifier">P</span><span class="plain">, </span><span class="reserved">void</span><span class="plain"> *</span><span class="identifier">state</span><span class="plain">) {</span>
<span class="reserved">ipct_state</span><span class="plain"> *</span><span class="identifier">ipct</span><span class="plain"> = (</span><span class="reserved">ipct_state</span><span class="plain"> *) </span><span class="identifier">state</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">P</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[</span><span class="constant">ID_IFLD</span><span class="plain">] == </span><span class="constant">PACKAGE_IST</span><span class="plain">) {</span>
<span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">pack</span><span class="plain"> = </span><span class="functiontext"><a href="4-tpc3.html#SP2">Inter::Package::defined_by_frame</a></span><span class="plain">(</span><span class="identifier">P</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">pack</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"no package defined here"</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::is_linklike</a></span><span class="plain">(</span><span class="identifier">pack</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain">;</span>
<span class="reserved">inter_symbols_table</span><span class="plain"> *</span><span class="identifier">T</span><span class="plain"> = </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::scope</a></span><span class="plain">(</span><span class="identifier">pack</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">T</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"package with no symbols"</span><span class="plain">);</span>
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">i</span><span class="plain">=0; </span><span class="identifier">i</span><span class="plain">&lt;</span><span class="identifier">T</span><span class="plain">-&gt;</span><span class="element">size</span><span class="plain">; </span><span class="identifier">i</span><span class="plain">++) {</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">symb</span><span class="plain"> = </span><span class="identifier">T</span><span class="plain">-&gt;</span><span class="element">symbol_array</span><span class="plain">[</span><span class="identifier">i</span><span class="plain">];</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">symb</span><span class="plain">) &amp;&amp; (</span><span class="identifier">symb</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">)) {</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">target</span><span class="plain"> = </span><span class="identifier">symb</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">;</span>
<span class="reserved">while</span><span class="plain"> (</span><span class="identifier">target</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">) </span><span class="identifier">target</span><span class="plain"> = </span><span class="identifier">target</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain">;</span>
<span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">target_package</span><span class="plain"> = </span><span class="identifier">target</span><span class="plain">-&gt;</span><span class="element">owning_table</span><span class="plain">-&gt;</span><span class="element">owning_package</span><span class="plain">;</span>
<span class="reserved">while</span><span class="plain"> ((</span><span class="identifier">target_package</span><span class="plain">) &amp;&amp; (</span><span class="identifier">target_package</span><span class="plain"> != </span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">migrant</span><span class="plain">)) {</span>
<span class="identifier">target_package</span><span class="plain"> = </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::parent</a></span><span class="plain">(</span><span class="identifier">target_package</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">target_package</span><span class="plain"> == </span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">migrant</span><span class="plain">)</span>
&lt;<span class="cwebmacro">Correct the origin reference to this migrant symbol</span> <span class="cwebmacronumber">4.1</span>&gt;<span class="plain">;</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP4_1"></a><b>&#167;4.1. </b><code class="display">
&lt;<span class="cwebmacrodefn">Correct the origin reference to this migrant symbol</span> <span class="cwebmacronumber">4.1</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">equivalent</span><span class="plain"> = </span><span class="functiontext"><a href="#SP1">Inter::Transmigration::cached_equivalent</a></span><span class="plain">(</span><span class="identifier">target</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">equivalent</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) {</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">URL</span><span class="plain">);</span>
<span class="functiontext"><a href="2-st.html#SP11">Inter::SymbolsTables::symbol_to_url_name</a></span><span class="plain">(</span><span class="identifier">URL</span><span class="plain">, </span><span class="identifier">target</span><span class="plain">);</span>
<span class="identifier">equivalent</span><span class="plain"> = </span><span class="functiontext"><a href="2-cnn.html#SP1">Inter::Connectors::plug</a></span><span class="plain">(</span><span class="identifier">ipct</span><span class="plain">-&gt;</span><span class="element">origin_tree</span><span class="plain">, </span><span class="identifier">URL</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">URL</span><span class="plain">);</span>
<span class="functiontext"><a href="#SP1">Inter::Transmigration::cache</a></span><span class="plain">(</span><span class="identifier">target</span><span class="plain">, </span><span class="identifier">equivalent</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="identifier">symb</span><span class="plain">-&gt;</span><span class="element">equated_to</span><span class="plain"> = </span><span class="identifier">equivalent</span><span class="plain">;</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP4">&#167;4</a>.</p>
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