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<!--Weave of '3/vrb' 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#3">Chapter 3: Inter to Final Code</a></li><li><b>Variables</b></li></ul><p class="purpose">To generate the initial state of storage for variables.</p>
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. </b></p>
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<pre class="display">
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">variables_written</span><span class="plain"> = </span><span class="identifier">FALSE</span><span class="plain">, </span><span class="identifier">prepare_counter</span><span class="plain"> = 0, </span><span class="identifier">knowledge_counter</span><span class="plain"> = 0;</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">CodeGen::Var::prepare</span><span class="plain">(</span><span class="reserved">code_generation</span><span class="plain"> *</span><span class="identifier">gen</span><span class="plain">) {</span>
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<span class="identifier">variables_written</span><span class="plain"> = </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="identifier">prepare_counter</span><span class="plain"> = 0;</span>
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<span class="identifier">knowledge_counter</span><span class="plain"> = 0;</span>
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<span class="identifier">Inter::Tree::traverse</span><span class="plain">(</span><span class="identifier">gen</span><span class="plain">-</span><span class="element">>from</span><span class="plain">, </span><span class="functiontext">CodeGen::Var::visitor1</span><span class="plain">, </span><span class="identifier">gen</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">VARIABLE_IST</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">CodeGen::Var::visitor1</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="reserved">code_generation</span><span class="plain"> *</span><span class="identifier">gen</span><span class="plain"> = (</span><span class="reserved">code_generation</span><span class="plain"> *) </span><span class="identifier">state</span><span class="plain">;</span>
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<span class="identifier">inter_symbol</span><span class="plain"> *</span><span class="identifier">var_name</span><span class="plain"> = </span><span class="identifier">Inter::SymbolsTables::symbol_from_frame_data</span><span class="plain">(</span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">DEFN_VAR_IFLD</span><span class="plain">);</span>
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<span class="identifier">prepare_counter</span><span class="plain"> = </span><span class="functiontext">CodeGen::Targets::prepare_variable</span><span class="plain">(</span><span class="identifier">gen</span><span class="plain">, </span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">var_name</span><span class="plain">, </span><span class="identifier">prepare_counter</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">CodeGen::Var::knowledge</span><span class="plain">(</span><span class="reserved">code_generation</span><span class="plain"> *</span><span class="identifier">gen</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">variables_written</span><span class="plain"> == </span><span class="identifier">FALSE</span><span class="plain">) {</span>
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<span class="identifier">variables_written</span><span class="plain"> = </span><span class="identifier">TRUE</span><span class="plain">;</span>
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<span class="identifier">Inter::Tree::traverse</span><span class="plain">(</span><span class="identifier">gen</span><span class="plain">-</span><span class="element">>from</span><span class="plain">, </span><span class="functiontext">CodeGen::Var::visitor2</span><span class="plain">, </span><span class="identifier">gen</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">, </span><span class="identifier">VARIABLE_IST</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="reserved">void</span><span class="plain"> </span><span class="functiontext">CodeGen::Var::visitor2</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="reserved">code_generation</span><span class="plain"> *</span><span class="identifier">gen</span><span class="plain"> = (</span><span class="reserved">code_generation</span><span class="plain"> *) </span><span class="identifier">state</span><span class="plain">;</span>
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<span class="identifier">inter_symbol</span><span class="plain"> *</span><span class="identifier">var_name</span><span class="plain"> = </span><span class="identifier">Inter::SymbolsTables::symbol_from_frame_data</span><span class="plain">(</span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">DEFN_VAR_IFLD</span><span class="plain">);</span>
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<span class="identifier">knowledge_counter</span><span class="plain"> = </span><span class="functiontext">CodeGen::Targets::declare_variable</span><span class="plain">(</span><span class="identifier">gen</span><span class="plain">, </span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">var_name</span><span class="plain">, </span><span class="identifier">knowledge_counter</span><span class="plain">, </span><span class="identifier">prepare_counter</span><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::Var::prepare is used in 3/cg (<a href="3-cg.html#SP8_1">§8.1</a>).</p>
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<p class="endnote">The function CodeGen::Var::visitor1 appears nowhere else.</p>
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<p class="endnote">The function CodeGen::Var::knowledge is used in 3/fc (<a href="3-fc.html#SP1">§1</a>).</p>
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<p class="endnote">The function CodeGen::Var::visitor2 appears nowhere else.</p>
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<hr class="tocbar">
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<ul class="toc"><li><a href="3-iap.html">Back to 'Instances and Properties'</a></li><li><i>(This section ends Chapter 3: Inter to Final Code.)</i></li></ul><hr class="tocbar">
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<!--End of weave-->
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