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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>3/bs2</title>
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<meta name="viewport" content="width=device-width initial-scale=1">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="Content-Language" content="en-gb">
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<link href="../inweb.css" rel="stylesheet" rev="stylesheet" type="text/css">
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</head>
<body>
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<nav role="navigation">
<h1><a href="../webs.html">Sources</a></h1>
<ul>
<li><a href="../compiler.html"><b>compiler tools</b></a></li>
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<li><a href="../other.html">other tools</a></li>
<li><a href="../extensions.html">extensions and kits</a></li>
<li><a href="../units.html">unit test tools</a></li>
</ul>
<h2>Compiler Webs</h2>
<ul>
<li><a href="../inbuild/index.html">inbuild</a></li>
<li><a href="../inform7/index.html">inform7</a></li>
<li><a href="../inter/index.html">inter</a></li>
</ul>
<h2>Inbuild Modules</h2>
<ul>
<li><a href="../inbuild-module/index.html">inbuild</a></li>
<li><a href="../arch-module/index.html">arch</a></li>
<li><a href="../words-module/index.html">words</a></li>
<li><a href="../syntax-module/index.html">syntax</a></li>
<li><a href="../html-module/index.html">html</a></li>
</ul>
<h2>Inform7 Modules</h2>
<ul>
<li><a href="../core-module/index.html">core</a></li>
<li><a href="../problems-module/index.html">problems</a></li>
<li><a href="../inflections-module/index.html">inflections</a></li>
<li><a href="../linguistics-module/index.html">linguistics</a></li>
<li><a href="../kinds-module/index.html">kinds</a></li>
<li><a href="../if-module/index.html">if</a></li>
<li><a href="../multimedia-module/index.html">multimedia</a></li>
<li><a href="../index-module/index.html">index</a></li>
</ul>
<h2>Inter Modules</h2>
<ul>
<li><a href="../inter-module/index.html">inter</a></li>
<li><a href="../building-module/index.html">building</a></li>
<li><a href="../codegen-module/index.html">codegen</a></li>
</ul>
<h2>Foundation</h2>
<ul>
<li><a href="../../../inweb/docs/foundation-module/index.html">foundation</a></li>
</ul>
</nav>
<main role="main">
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<!--Weave of '3/is' generated by 7-->
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<ul class="crumbs"><li><a href="../webs.html">Source</a></li><li><a href="../compiler.html">Compiler Modules</a></li><li><a href="index.html">inbuild</a></li><li><a href="index.html#3">Chapter 3: Incremental Builds</a></li><li><b>Inter Skill</b></li></ul><p class="purpose">The skills of kit assimilation and of code generation from Inter.</p>
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<ul class="toc"><li><a href="#SP1">&#167;1. Creation</a></li><li><a href="#SP2">&#167;2. Assimilation</a></li><li><a href="#SP4">&#167;4. Code generation</a></li></ul><hr class="tocbar">
<p class="inwebparagraph"><a id="SP1"></a><b>&#167;1. Creation. </b>Note that code generation can only be done internally, and only in fact within
the <code class="display"><span class="extract">inform7</span></code> compiler: this is because the Inter code which it generates from
is being held in memory by <code class="display"><span class="extract">inform7</span></code>.
</p>
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<pre class="display">
<span class="reserved">build_skill</span><span class="plain"> *</span><span class="identifier">assimilate_using_inter_skill</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="reserved">build_skill</span><span class="plain"> *</span><span class="identifier">code_generate_using_inter_skill</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">InterSkill::create</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="identifier">assimilate_using_inter_skill</span><span class="plain"> =</span>
<span class="functiontext">BuildSteps::new_skill</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"assimilate using inter"</span><span class="plain">);</span>
<span class="identifier">METHOD_ADD</span><span class="plain">(</span><span class="identifier">assimilate_using_inter_skill</span><span class="plain">, </span><span class="constant">BUILD_SKILL_COMMAND_MTID</span><span class="plain">,</span>
<span class="functiontext">InterSkill::assimilate_via_shell</span><span class="plain">);</span>
<span class="identifier">METHOD_ADD</span><span class="plain">(</span><span class="identifier">assimilate_using_inter_skill</span><span class="plain">, </span><span class="constant">BUILD_SKILL_INTERNAL_MTID</span><span class="plain">,</span>
<span class="functiontext">InterSkill::assimilate_internally</span><span class="plain">);</span>
<span class="identifier">code_generate_using_inter_skill</span><span class="plain"> =</span>
<span class="functiontext">BuildSteps::new_skill</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"code generate using inter"</span><span class="plain">);</span>
<span class="identifier">METHOD_ADD</span><span class="plain">(</span><span class="identifier">code_generate_using_inter_skill</span><span class="plain">, </span><span class="constant">BUILD_SKILL_INTERNAL_MTID</span><span class="plain">,</span>
<span class="functiontext">InterSkill::code_generate_internally</span><span class="plain">);</span>
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<span class="plain">}</span>
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</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The function InterSkill::create is used in 1/ic (<a href="1-ic.html#SP3">&#167;3</a>).</p>
<p class="inwebparagraph"><a id="SP2"></a><b>&#167;2. Assimilation. </b></p>
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<pre class="display">
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">InterSkill::assimilate_via_shell</span><span class="plain">(</span><span class="reserved">build_skill</span><span class="plain"> *</span><span class="identifier">skill</span><span class="plain">, </span><span class="reserved">build_step</span><span class="plain"> *</span><span class="identifier">S</span><span class="plain">,</span>
<span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">command</span><span class="plain">, </span><span class="reserved">build_methodology</span><span class="plain"> *</span><span class="identifier">BM</span><span class="plain">) {</span>
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<span class="identifier">inter_architecture</span><span class="plain"> *</span><span class="identifier">A</span><span class="plain"> = </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">for_arch</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">A</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 architecture given"</span><span class="plain">);</span>
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<span class="identifier">pathname</span><span class="plain"> *</span><span class="identifier">kit_path</span><span class="plain"> = </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">associated_copy</span><span class="plain">-&gt;</span><span class="element">location_if_path</span><span class="plain">;</span>
<span class="identifier">Shell::quote_file</span><span class="plain">(</span><span class="identifier">command</span><span class="plain">, </span><span class="identifier">BM</span><span class="plain">-&gt;</span><span class="element">to_inter</span><span class="plain">);</span>
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<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">command</span><span class="plain">, </span><span class="string">"-architecture %S "</span><span class="plain">, </span><span class="identifier">Architectures::to_codename</span><span class="plain">(</span><span class="identifier">A</span><span class="plain">));</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">command</span><span class="plain">, </span><span class="string">"-assimilate "</span><span class="plain">);</span>
<span class="identifier">Shell::quote_path</span><span class="plain">(</span><span class="identifier">command</span><span class="plain">, </span><span class="identifier">kit_path</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
<span class="plain">}</span>
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</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The function InterSkill::assimilate_via_shell is used in <a href="#SP1">&#167;1</a>.</p>
<p class="inwebparagraph"><a id="SP3"></a><b>&#167;3. </b>Something to watch out for here is that, when running internally as part of
<code class="display"><span class="extract">inform7</span></code>, we use the copy of the <code class="display"><span class="extract">assimilate</span></code> pipeline inside the installation
of <code class="display"><span class="extract">inform7</span></code> (it will be in the internal nest). When we perform assimilation
from the command line using the <code class="display"><span class="extract">inter</span></code> tool, we use the <code class="display"><span class="extract">assimilate</span></code> pipeline
supplied in the <code class="display"><span class="extract">inter</span></code> installation. But those two files are in fact the same,
or should be, so the effect is the same.
</p>
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<pre class="display">
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">InterSkill::assimilate_internally</span><span class="plain">(</span><span class="reserved">build_skill</span><span class="plain"> *</span><span class="identifier">skill</span><span class="plain">, </span><span class="reserved">build_step</span><span class="plain"> *</span><span class="identifier">S</span><span class="plain">,</span>
<span class="reserved">build_methodology</span><span class="plain"> *</span><span class="identifier">BM</span><span class="plain">) {</span>
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<span class="plain">#</span><span class="identifier">ifdef</span><span class="plain"> </span><span class="identifier">CODEGEN_MODULE</span>
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<span class="identifier">inter_architecture</span><span class="plain"> *</span><span class="identifier">A</span><span class="plain"> = </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">for_arch</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">A</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 architecture given"</span><span class="plain">);</span>
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<span class="identifier">pathname</span><span class="plain"> *</span><span class="identifier">kit_path</span><span class="plain"> = </span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">associated_copy</span><span class="plain">-&gt;</span><span class="element">location_if_path</span><span class="plain">;</span>
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<span class="identifier">dictionary</span><span class="plain"> *</span><span class="identifier">pipeline_vars</span><span class="plain"> = </span><span class="identifier">CodeGen::Pipeline::basic_dictionary</span><span class="plain">(</span><span class="identifier">NULL</span><span class="plain">);</span>
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<span class="reserved">inbuild_requirement</span><span class="plain"> *</span><span class="identifier">req</span><span class="plain"> =</span>
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<span class="functiontext">Requirements::any_version_of</span><span class="plain">(</span>
<span class="functiontext">Works::new</span><span class="plain">(</span><span class="identifier">pipeline_genre</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"assimilate.interpipeline"</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">));</span>
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<span class="reserved">inbuild_search_result</span><span class="plain"> *</span><span class="identifier">R</span><span class="plain"> = </span><span class="functiontext">Nests::search_for_best</span><span class="plain">(</span><span class="identifier">req</span><span class="plain">, </span><span class="functiontext">Inbuild::nest_list</span><span class="plain">());</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">R</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) {</span>
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<span class="identifier">Errors::nowhere</span><span class="plain">(</span><span class="string">"assimilate pipeline could not be found"</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
<span class="plain">}</span>
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<span class="identifier">filename</span><span class="plain"> *</span><span class="identifier">pipeline_as_file</span><span class="plain"> = </span><span class="identifier">R</span><span class="plain">-&gt;</span><span class="element">copy</span><span class="plain">-&gt;</span><span class="element">location_if_file</span><span class="plain">;</span>
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<span class="identifier">filename</span><span class="plain"> *</span><span class="identifier">assim</span><span class="plain"> = </span><span class="identifier">Architectures::canonical_binary</span><span class="plain">(</span><span class="identifier">kit_path</span><span class="plain">, </span><span class="identifier">A</span><span class="plain">);</span>
<span class="identifier">filename</span><span class="plain"> *</span><span class="identifier">assim_t</span><span class="plain"> = </span><span class="identifier">Architectures::canonical_textual</span><span class="plain">(</span><span class="identifier">kit_path</span><span class="plain">, </span><span class="identifier">A</span><span class="plain">);</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">fullname</span><span class="plain">);</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">fullname</span><span class="plain">, </span><span class="string">"%f"</span><span class="plain">, </span><span class="identifier">assim</span><span class="plain">);</span>
<span class="identifier">Str::copy</span><span class="plain">(</span><span class="identifier">Dictionaries::create_text</span><span class="plain">(</span><span class="identifier">pipeline_vars</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"*out"</span><span class="plain">), </span><span class="identifier">fullname</span><span class="plain">);</span>
<span class="identifier">Str::clear</span><span class="plain">(</span><span class="identifier">fullname</span><span class="plain">);</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">fullname</span><span class="plain">, </span><span class="string">"%f"</span><span class="plain">, </span><span class="identifier">assim_t</span><span class="plain">);</span>
<span class="identifier">Str::copy</span><span class="plain">(</span><span class="identifier">Dictionaries::create_text</span><span class="plain">(</span><span class="identifier">pipeline_vars</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"*outt"</span><span class="plain">), </span><span class="identifier">fullname</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">fullname</span><span class="plain">);</span>
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<span class="identifier">Str::copy</span><span class="plain">(</span><span class="identifier">Dictionaries::create_text</span><span class="plain">(</span><span class="identifier">pipeline_vars</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"*kit"</span><span class="plain">),</span>
<span class="identifier">Pathnames::directory_name</span><span class="plain">(</span><span class="identifier">kit_path</span><span class="plain">));</span>
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<span class="identifier">linked_list</span><span class="plain"> *</span><span class="identifier">inter_paths</span><span class="plain"> = </span><span class="identifier">NEW_LINKED_LIST</span><span class="plain">(</span><span class="identifier">pathname</span><span class="plain">);</span>
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<span class="identifier">ADD_TO_LINKED_LIST</span><span class="plain">(</span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">associated_copy</span><span class="plain">-&gt;</span><span class="element">location_if_path</span><span class="plain">, </span><span class="identifier">pathname</span><span class="plain">, </span><span class="identifier">inter_paths</span><span class="plain">);</span>
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<span class="identifier">codegen_pipeline</span><span class="plain"> *</span><span class="identifier">SS</span><span class="plain"> =</span>
<span class="identifier">CodeGen::Pipeline::parse_from_file</span><span class="plain">(</span><span class="identifier">pipeline_as_file</span><span class="plain">, </span><span class="identifier">pipeline_vars</span><span class="plain">);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">SS</span><span class="plain">) {</span>
<span class="identifier">linked_list</span><span class="plain"> *</span><span class="identifier">requirements_list</span><span class="plain"> = </span><span class="identifier">NEW_LINKED_LIST</span><span class="plain">(</span><span class="identifier">inter_library</span><span class="plain">);</span>
<span class="identifier">CodeGen::Pipeline::run</span><span class="plain">(</span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">SS</span><span class="plain">, </span><span class="identifier">inter_paths</span><span class="plain">, </span><span class="identifier">requirements_list</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
<span class="identifier">Errors::nowhere</span><span class="plain">(</span><span class="string">"assimilate pipeline could not be parsed"</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="plain">#</span><span class="identifier">endif</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
<span class="plain">}</span>
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</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The function InterSkill::assimilate_internally is used in <a href="#SP1">&#167;1</a>.</p>
<p class="inwebparagraph"><a id="SP4"></a><b>&#167;4. Code generation. </b>This can only be done internally, for reasons given above, and only when the
<code class="display"><span class="extract">codegen</span></code> module is present in the current executable (which in practice means:
only inside <code class="display"><span class="extract">inform7</span></code>).
</p>
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<p class="inwebparagraph">Recall that the <code class="display"><span class="extract">inter_pipeline_name</span></code> is managed in Inbuild Control, but that
it defaults to <code class="display"><span class="extract">compile</span></code>.
</p>
<pre class="display">
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">InterSkill::code_generate_internally</span><span class="plain">(</span><span class="reserved">build_skill</span><span class="plain"> *</span><span class="identifier">skill</span><span class="plain">, </span><span class="reserved">build_step</span><span class="plain"> *</span><span class="identifier">S</span><span class="plain">,</span>
<span class="reserved">build_methodology</span><span class="plain"> *</span><span class="identifier">BM</span><span class="plain">) {</span>
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<span class="plain">#</span><span class="identifier">ifdef</span><span class="plain"> </span><span class="identifier">CODEGEN_MODULE</span>
<span class="identifier">clock_t</span><span class="plain"> </span><span class="identifier">back_end</span><span class="plain"> = </span><span class="identifier">clock</span><span class="plain">();</span>
<span class="identifier">CodeGen::Architecture::set</span><span class="plain">(</span>
<span class="identifier">Architectures::to_codename</span><span class="plain">(</span>
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<span class="identifier">TargetVMs::get_architecture</span><span class="plain">(</span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">for_vm</span><span class="plain">)));</span>
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<span class="identifier">Str::copy</span><span class="plain">(</span><span class="identifier">Dictionaries::create_text</span><span class="plain">(</span><span class="identifier">pipeline_vars</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"*in"</span><span class="plain">), </span><span class="identifier">I</span><span class="string">"*memory"</span><span class="plain">);</span>
<span class="identifier">Str::copy</span><span class="plain">(</span><span class="identifier">Dictionaries::create_text</span><span class="plain">(</span><span class="identifier">pipeline_vars</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"*out"</span><span class="plain">),</span>
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<span class="identifier">Filenames::get_leafname</span><span class="plain">(</span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">vertex</span><span class="plain">-&gt;</span><span class="element">as_file</span><span class="plain">));</span>
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<span class="identifier">filename</span><span class="plain"> *</span><span class="identifier">F</span><span class="plain"> = </span><span class="identifier">inter_pipeline_file</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">F</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) {</span>
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<span class="reserved">inbuild_requirement</span><span class="plain"> *</span><span class="identifier">req</span><span class="plain"> =</span>
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<span class="functiontext">Requirements::any_version_of</span><span class="plain">(</span>
<span class="functiontext">Works::new</span><span class="plain">(</span><span class="identifier">pipeline_genre</span><span class="plain">, </span><span class="identifier">inter_pipeline_name</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">));</span>
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<span class="reserved">inbuild_search_result</span><span class="plain"> *</span><span class="identifier">R</span><span class="plain"> = </span><span class="functiontext">Nests::search_for_best</span><span class="plain">(</span><span class="identifier">req</span><span class="plain">, </span><span class="functiontext">Inbuild::nest_list</span><span class="plain">());</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">R</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) {</span>
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<span class="identifier">Errors::with_text</span><span class="plain">(</span><span class="string">"inter pipeline '%S' could not be found"</span><span class="plain">,</span>
<span class="identifier">inter_pipeline_name</span><span class="plain">);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="identifier">F</span><span class="plain"> = </span><span class="identifier">R</span><span class="plain">-&gt;</span><span class="element">copy</span><span class="plain">-&gt;</span><span class="element">location_if_file</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="identifier">codegen_pipeline</span><span class="plain"> *</span><span class="identifier">SS</span><span class="plain"> = </span><span class="identifier">CodeGen::Pipeline::parse_from_file</span><span class="plain">(</span><span class="identifier">F</span><span class="plain">, </span><span class="identifier">pipeline_vars</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">SS</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) {</span>
<span class="identifier">Errors::nowhere</span><span class="plain">(</span><span class="string">"inter pipeline file could not be parsed"</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="plain">}</span>
<span class="identifier">CodeGen::Pipeline::set_repository</span><span class="plain">(</span><span class="identifier">SS</span><span class="plain">, </span><span class="identifier">Emit::tree</span><span class="plain">());</span>
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<span class="identifier">CodeGen::Pipeline::run</span><span class="plain">(</span><span class="identifier">Filenames::get_path_to</span><span class="plain">(</span><span class="identifier">S</span><span class="plain">-&gt;</span><span class="element">vertex</span><span class="plain">-&gt;</span><span class="element">as_file</span><span class="plain">),</span>
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<span class="identifier">SS</span><span class="plain">, </span><span class="functiontext">Kits::inter_paths</span><span class="plain">(),</span>
<span class="functiontext">Projects::list_of_inter_libraries</span><span class="plain">(</span><span class="functiontext">Inbuild::project</span><span class="plain">()));</span>
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<span class="identifier">LOG</span><span class="plain">(</span><span class="string">"Back end elapsed time: %dcs\n"</span><span class="plain">,</span>
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<span class="plain">((</span><span class="reserved">int</span><span class="plain">) (</span><span class="identifier">clock</span><span class="plain">() - </span><span class="identifier">back_end</span><span class="plain">)) / (</span><span class="identifier">CLOCKS_PER_SEC</span><span class="plain">/100));</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
<span class="plain">#</span><span class="identifier">endif</span>
<span class="plain">#</span><span class="identifier">ifndef</span><span class="plain"> </span><span class="identifier">CORE_MODULE</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
<span class="plain">#</span><span class="identifier">endif</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
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<p class="endnote">The function InterSkill::code_generate_internally is used in <a href="#SP1">&#167;1</a>.</p>
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