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Graham Nelson 9f70fcd796 Limited progress towards a basic_inform library
2019-09-22 16:43:06 +01:00

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<ul class="crumbs"><li><a href="../webs.html">&#9733;</a></li><li><a href="index.html">codegen</a></li><li><a href="index.html#1">Chapter 1: Setting Up</a></li><li><b>Libraries</b></li></ul><p class="purpose">Architecture-neutral blocks of linkable inter material are called libraries.</p>
<ul class="toc"><li><a href="#SP1">&#167;1. </a></li><li><a href="#SP2">&#167;2. Link stage</a></li></ul><hr class="tocbar">
<p class="inwebparagraph"><a id="SP1"></a><b>&#167;1. </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">inter_library</span><span class="plain"> {</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="identifier">pathname</span><span class="plain"> *</span><span class="identifier">location</span><span class="plain">;</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">attachment_point</span><span class="plain">;</span>
<span class="identifier">MEMORY_MANAGEMENT</span>
<span class="plain">} </span><span class="reserved">inter_library</span><span class="plain">;</span>
<span class="reserved">inter_library</span><span class="plain"> *</span><span class="functiontext">CodeGen::Libraries::new</span><span class="plain">(</span><span class="identifier">pathname</span><span class="plain"> *</span><span class="identifier">P</span><span class="plain">) {</span>
<span class="reserved">inter_library</span><span class="plain"> *</span><span class="identifier">lib</span><span class="plain"> = </span><span class="identifier">CREATE</span><span class="plain">(</span><span class="reserved">inter_library</span><span class="plain">);</span>
<span class="identifier">lib</span><span class="plain">-</span><span class="element">&gt;location</span><span class="plain"> = </span><span class="identifier">P</span><span class="plain">;</span>
<span class="identifier">lib</span><span class="plain">-</span><span class="element">&gt;attachment_point</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="identifier">filename</span><span class="plain"> *</span><span class="identifier">F</span><span class="plain"> = </span><span class="identifier">Filenames::in_folder</span><span class="plain">(</span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"library_metadata.txt"</span><span class="plain">);</span>
<span class="identifier">TextFiles::read</span><span class="plain">(</span><span class="identifier">F</span><span class="plain">, </span><span class="identifier">FALSE</span><span class="plain">,</span>
<span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">FALSE</span><span class="plain">, </span><span class="functiontext">CodeGen::Libraries::read_metadata</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="identifier">lib</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">lib</span><span class="plain">-</span><span class="element">&gt;attachment_point</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">"library metadata file failed to set attachment point"</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">lib</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="identifier">text_stream</span><span class="plain"> *</span><span class="functiontext">CodeGen::Libraries::URL</span><span class="plain">(</span><span class="reserved">inter_library</span><span class="plain"> *</span><span class="identifier">lib</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">lib</span><span class="plain"> == </span><span class="identifier">NULL</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="reserved">return</span><span class="plain"> </span><span class="identifier">lib</span><span class="plain">-</span><span class="element">&gt;attachment_point</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">CodeGen::Libraries::read_metadata</span><span class="plain">(</span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">text</span><span class="plain">,</span>
<span class="identifier">text_file_position</span><span class="plain"> *</span><span class="identifier">tfp</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">inter_library</span><span class="plain"> *</span><span class="identifier">lib</span><span class="plain"> = (</span><span class="reserved">inter_library</span><span class="plain"> *) </span><span class="identifier">state</span><span class="plain">;</span>
<span class="identifier">match_results</span><span class="plain"> </span><span class="identifier">mr</span><span class="plain"> = </span><span class="identifier">Regexp::create_mr</span><span class="plain">();</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">Str::is_whitespace</span><span class="plain">(</span><span class="identifier">text</span><span class="plain">)) || (</span><span class="identifier">Regexp::match</span><span class="plain">(&amp;</span><span class="identifier">mr</span><span class="plain">, </span><span class="identifier">text</span><span class="plain">, </span><span class="identifier">L</span><span class="string">" *#%c*"</span><span class="plain">))) {</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="identifier">Regexp::match</span><span class="plain">(&amp;</span><span class="identifier">mr</span><span class="plain">, </span><span class="identifier">text</span><span class="plain">, </span><span class="identifier">L</span><span class="string">"attach: (%c*)"</span><span class="plain">)) {</span>
<span class="identifier">lib</span><span class="plain">-</span><span class="element">&gt;attachment_point</span><span class="plain"> = </span><span class="identifier">Str::duplicate</span><span class="plain">(</span><span class="identifier">mr</span><span class="plain">.</span><span class="identifier">exp</span><span class="plain">[0]);</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
<span class="identifier">Errors::in_text_file</span><span class="plain">(</span><span class="string">"illegible line in library metadata file"</span><span class="plain">, </span><span class="identifier">tfp</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="identifier">Regexp::dispose_of</span><span class="plain">(&amp;</span><span class="identifier">mr</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">inter_library</span><span class="plain"> *</span><span class="functiontext">CodeGen::Libraries::find</span><span class="plain">(</span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">name</span><span class="plain">, </span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">N</span><span class="plain">, </span><span class="identifier">pathname</span><span class="plain"> **</span><span class="identifier">PP</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">N</span><span class="plain">; </span><span class="identifier">i</span><span class="plain">++) {</span>
<span class="identifier">pathname</span><span class="plain"> *</span><span class="identifier">P</span><span class="plain"> = </span><span class="identifier">Pathnames::subfolder</span><span class="plain">(</span><span class="identifier">PP</span><span class="plain">[</span><span class="identifier">i</span><span class="plain">], </span><span class="identifier">name</span><span class="plain">);</span>
<span class="identifier">filename</span><span class="plain"> *</span><span class="identifier">F</span><span class="plain"> = </span><span class="identifier">Filenames::in_folder</span><span class="plain">(</span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"library_metadata.txt"</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">TextFiles::exists</span><span class="plain">(</span><span class="identifier">F</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain"> </span><span class="functiontext">CodeGen::Libraries::new</span><span class="plain">(</span><span class="identifier">P</span><span class="plain">);</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>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The function CodeGen::Libraries::new appears nowhere else.</p>
<p class="endnote">The function CodeGen::Libraries::URL appears nowhere else.</p>
<p class="endnote">The function CodeGen::Libraries::read_metadata appears nowhere else.</p>
<p class="endnote">The function CodeGen::Libraries::find appears nowhere else.</p>
<p class="endnote">The structure inter_library is private to this section.</p>
<p class="inwebparagraph"><a id="SP2"></a><b>&#167;2. Link stage. </b></p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">CodeGen::Libraries::create_pipeline_stage</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
<span class="functiontext">CodeGen::Stage::new</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"link"</span><span class="plain">, </span><span class="functiontext">CodeGen::Libraries::run_link_stage</span><span class="plain">, </span><span class="constant">NO_STAGE_ARG</span><span class="plain">, </span><span class="identifier">FALSE</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">CodeGen::Libraries::run_link_stage</span><span class="plain">(</span><span class="reserved">pipeline_step</span><span class="plain"> *</span><span class="identifier">step</span><span class="plain">) {</span>
<span class="reserved">inter_library</span><span class="plain"> *</span><span class="identifier">req</span><span class="plain">;</span>
<span class="identifier">LOOP_OVER_LINKED_LIST</span><span class="plain">(</span><span class="identifier">req</span><span class="plain">, </span><span class="reserved">inter_library</span><span class="plain">, </span><span class="identifier">step</span><span class="plain">-</span><span class="element">&gt;requirements_list</span><span class="plain">) {</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">leafname</span><span class="plain">);</span>
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">leafname</span><span class="plain">, </span><span class="string">"%S.interb"</span><span class="plain">, </span><span class="functiontext">CodeGen::Architecture::leafname</span><span class="plain">());</span>
<span class="identifier">filename</span><span class="plain"> *</span><span class="identifier">arch_file</span><span class="plain"> = </span><span class="identifier">Filenames::in_folder</span><span class="plain">(</span><span class="identifier">req</span><span class="plain">-</span><span class="element">&gt;location</span><span class="plain">, </span><span class="identifier">leafname</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">TextFiles::exists</span><span class="plain">(</span><span class="identifier">arch_file</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">"no arch file for requirement"</span><span class="plain">);</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">leafname</span><span class="plain">);</span>
<span class="identifier">inter_tree</span><span class="plain"> *</span><span class="identifier">sidecar</span><span class="plain"> = </span><span class="identifier">Inter::Tree::new</span><span class="plain">();</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Inter::Binary::test_file</span><span class="plain">(</span><span class="identifier">arch_file</span><span class="plain">)) </span><span class="identifier">Inter::Binary::read</span><span class="plain">(</span><span class="identifier">sidecar</span><span class="plain">, </span><span class="identifier">arch_file</span><span class="plain">);</span>
<span class="reserved">else</span><span class="plain"> </span><span class="identifier">Inter::Textual::read</span><span class="plain">(</span><span class="identifier">sidecar</span><span class="plain">, </span><span class="identifier">arch_file</span><span class="plain">);</span>
<span class="identifier">inter_package</span><span class="plain"> *</span><span class="identifier">pack</span><span class="plain"> = </span><span class="identifier">Inter::Packages::by_url</span><span class="plain">(</span><span class="identifier">sidecar</span><span class="plain">, </span><span class="identifier">req</span><span class="plain">-</span><span class="element">&gt;attachment_point</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">WRITE_TO</span><span class="plain">(</span><span class="identifier">STDERR</span><span class="plain">, </span><span class="string">"sought attachment material at: %S in %f\</span><span class="plain">n</span><span class="string">"</span><span class="plain">, </span><span class="identifier">req</span><span class="plain">-</span><span class="element">&gt;attachment_point</span><span class="plain">, </span><span class="identifier">arch_file</span><span class="plain">);</span>
<span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"unable to find attachment point package"</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="identifier">Inter::Transmigration::move</span><span class="plain">(</span><span class="identifier">pack</span><span class="plain">, </span><span class="identifier">Site::main_package</span><span class="plain">(</span><span class="identifier">step</span><span class="plain">-</span><span class="element">&gt;repository</span><span class="plain">), </span><span class="identifier">FALSE</span><span class="plain">);</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>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The function CodeGen::Libraries::create_pipeline_stage is used in 1/stg (<a href="1-stg.html#SP2">&#167;2</a>).</p>
<p class="endnote">The function CodeGen::Libraries::run_link_stage appears nowhere else.</p>
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<ul class="toc"><li><a href="1-arc.html">Back to 'Architecture'</a></li><li><a href="1-ppl.html">Continue with 'Pipelines'</a></li></ul><hr class="tocbar">
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