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<!--Weave of '2/unq' generated by 7-->
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<ul class="crumbs"><li><a href="../webs.html">★</a></li><li><a href="index.html">codegen</a></li><li><a href="index.html#2">Chapter 2: Miscellaneous Pipeline Stages</a></li><li><b>Uniqueness</b></li></ul><p class="purpose">To make sure certain symbol names translate into globally unique target symbols.</p>
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<ul class="toc"><li><a href="#SP1">§1. Pipeline stage</a></li></ul><hr class="tocbar">
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. Pipeline stage. </b></p>
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<pre class="display">
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">CodeGen::Uniqueness::create_pipeline_stage</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="functiontext">CodeGen::Stage::new</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"make-identifiers-unique"</span><span class="plain">, </span><span class="functiontext">CodeGen::Uniqueness::run_pipeline_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>
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<span class="plain">}</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">CodeGen::Uniqueness::run_pipeline_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>
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<span class="identifier">dictionary</span><span class="plain"> *</span><span class="identifier">D</span><span class="plain"> = </span><span class="identifier">Dictionaries::new</span><span class="plain">(</span><span class="identifier">INITIAL_INTER_SYMBOLS_ID_RANGE</span><span class="plain">, </span><span class="identifier">FALSE</span><span class="plain">);</span>
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<span class="identifier">Inter::Tree::traverse</span><span class="plain">(</span><span class="identifier">step</span><span class="plain">-</span><span class="element">>repository</span><span class="plain">, </span><span class="functiontext">CodeGen::Uniqueness::visitor</span><span class="plain">, </span><span class="identifier">D</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">, 0);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">struct</span><span class="plain"> </span><span class="reserved">uniqueness_count</span><span class="plain"> {</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">count</span><span class="plain">;</span>
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<span class="identifier">MEMORY_MANAGEMENT</span>
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<span class="plain">} </span><span class="reserved">uniqueness_count</span><span class="plain">;</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">CodeGen::Uniqueness::visitor</span><span class="plain">(</span><span class="identifier">inter_tree</span><span class="plain"> *</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">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>
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<span class="identifier">dictionary</span><span class="plain"> *</span><span class="identifier">D</span><span class="plain"> = (</span><span class="identifier">dictionary</span><span class="plain"> *) </span><span class="identifier">state</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">P</span><span class="plain">-></span><span class="identifier">W</span><span class="plain">.</span><span class="identifier">data</span><span class="plain">[</span><span class="identifier">ID_IFLD</span><span class="plain">] == </span><span class="identifier">PACKAGE_IST</span><span class="plain">) {</span>
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<span class="identifier">inter_package</span><span class="plain"> *</span><span class="identifier">Q</span><span class="plain"> = </span><span class="identifier">Inter::Package::defined_by_frame</span><span class="plain">(</span><span class="identifier">P</span><span class="plain">);</span>
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<span class="identifier">inter_symbols_table</span><span class="plain"> *</span><span class="identifier">ST</span><span class="plain"> = </span><span class="identifier">Inter::Packages::scope</span><span class="plain">(</span><span class="identifier">Q</span><span class="plain">);</span>
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<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"><</span><span class="identifier">ST</span><span class="plain">-></span><span class="identifier">size</span><span class="plain">; </span><span class="identifier">i</span><span class="plain">++) {</span>
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<span class="identifier">inter_symbol</span><span class="plain"> *</span><span class="identifier">S</span><span class="plain"> = </span><span class="identifier">ST</span><span class="plain">-></span><span class="identifier">symbol_array</span><span class="plain">[</span><span class="identifier">i</span><span class="plain">];</span>
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<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">S</span><span class="plain">) && (</span><span class="identifier">S</span><span class="plain">-></span><span class="identifier">equated_to</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) && (</span><span class="identifier">Inter::Symbols::get_flag</span><span class="plain">(</span><span class="identifier">S</span><span class="plain">, </span><span class="identifier">MAKE_NAME_UNIQUE</span><span class="plain">))) {</span>
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<span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">N</span><span class="plain"> = </span><span class="identifier">S</span><span class="plain">-></span><span class="identifier">symbol_name</span><span class="plain">;</span>
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<span class="reserved">uniqueness_count</span><span class="plain"> *</span><span class="identifier">U</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Dictionaries::find</span><span class="plain">(</span><span class="identifier">D</span><span class="plain">, </span><span class="identifier">N</span><span class="plain">)) {</span>
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<span class="identifier">U</span><span class="plain"> = (</span><span class="reserved">uniqueness_count</span><span class="plain"> *) </span><span class="identifier">Dictionaries::read_value</span><span class="plain">(</span><span class="identifier">D</span><span class="plain">, </span><span class="identifier">N</span><span class="plain">);</span>
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<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
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<span class="identifier">U</span><span class="plain"> = </span><span class="identifier">CREATE</span><span class="plain">(</span><span class="reserved">uniqueness_count</span><span class="plain">);</span>
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<span class="identifier">U</span><span class="plain">-</span><span class="element">>count</span><span class="plain"> = 0;</span>
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<span class="identifier">Dictionaries::create</span><span class="plain">(</span><span class="identifier">D</span><span class="plain">, </span><span class="identifier">N</span><span class="plain">);</span>
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<span class="identifier">Dictionaries::write_value</span><span class="plain">(</span><span class="identifier">D</span><span class="plain">, </span><span class="identifier">N</span><span class="plain">, (</span><span class="reserved">void</span><span class="plain"> *) </span><span class="identifier">U</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="identifier">U</span><span class="plain">-</span><span class="element">>count</span><span class="plain">++;</span>
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<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">T</span><span class="plain">);</span>
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<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="identifier">T</span><span class="plain">, </span><span class="string">"%S_U%d"</span><span class="plain">, </span><span class="identifier">N</span><span class="plain">, </span><span class="identifier">U</span><span class="plain">-</span><span class="element">>count</span><span class="plain">);</span>
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<span class="identifier">Inter::Symbols::set_translate</span><span class="plain">(</span><span class="identifier">S</span><span class="plain">, </span><span class="identifier">T</span><span class="plain">);</span>
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<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">T</span><span class="plain">);</span>
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<span class="identifier">Inter::Symbols::clear_flag</span><span class="plain">(</span><span class="identifier">S</span><span class="plain">, </span><span class="identifier">MAKE_NAME_UNIQUE</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="plain">}</span>
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<span class="plain">}</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function CodeGen::Uniqueness::create_pipeline_stage is used in 1/stg (<a href="1-stg.html#SP2">§2</a>).</p>
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<p class="endnote">The function CodeGen::Uniqueness::run_pipeline_stage appears nowhere else.</p>
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<p class="endnote">The function CodeGen::Uniqueness::visitor appears nowhere else.</p>
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<p class="endnote">The structure uniqueness_count is private to this section.</p>
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<hr class="tocbar">
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<ul class="toc"><li><a href="2-ip.html">Back to 'Inspect Plugs'</a></li><li><a href="2-rv.html">Continue with 'Reconcile Verbs'</a></li></ul><hr class="tocbar">
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