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<!--Weave of 'Vanilla Constants' generated by Inweb-->
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<div class="breadcrumbs">
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<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">final</a></li><li><a href="index.html#2">Chapter 2: Mechanism</a></li><li><b>Vanilla Constants</b></li></ul></div>
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<p class="purpose">How the vanilla code generation strategy handles constants, including literal texts, lists, and arrays.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>During the main <a href="2-vnl.html" class="internal">Vanilla</a> traverse, this is called on each constant definition
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in the tree:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaConstants::constant</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">VanillaConstants::constant</span></span>:<br/>Vanilla - <a href="2-vnl.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">con_name</span><span class="plain-syntax"> =</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">InterSymbolsTable::symbol_from_ID_at_node</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">DEFN_CONST_IFLD</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">con_name</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no constant"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">InterSymbol::is_metadata_key</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">InterSymbol::read_annotation</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">ACTION_IANN</span><span class="plain-syntax">) == </span><span class="constant-syntax">1</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-vc.html#SP1_1" class="named-paragraph-link"><span class="named-paragraph">Declare this constant as an action name</span><span class="named-paragraph-number">1.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">InterSymbol::read_annotation</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">FAKE_ACTION_IANN</span><span class="plain-syntax">) == </span><span class="constant-syntax">1</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-vc.html#SP1_2" class="named-paragraph-link"><span class="named-paragraph">Declare this constant as a fake action name</span><span class="named-paragraph-number">1.2</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">InterSymbol::read_annotation</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">VENEER_IANN</span><span class="plain-syntax">) > </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-vc.html#SP1_3" class="named-paragraph-link"><span class="named-paragraph">Ignore this constant as part of the veneer</span><span class="named-paragraph-number">1.3</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">InterSymbol::read_annotation</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">OBJECT_IANN</span><span class="plain-syntax">) > </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-vc.html#SP1_4" class="named-paragraph-link"><span class="named-paragraph">Declare this constant as a pseudo-object</span><span class="named-paragraph-number">1.4</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Inter::Constant::is_routine</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-vc.html#SP1_5" class="named-paragraph-link"><span class="named-paragraph">Declare this constant as a function</span><span class="named-paragraph-number">1.5</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">-></span><span class="identifier-syntax">symbol_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"UUID_ARRAY"</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-vc.html#SP1_6" class="named-paragraph-link"><span class="named-paragraph">Declare this constant as the special UUID string array</span><span class="named-paragraph-number">1.6</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">FORMAT_CONST_IFLD</span><span class="plain-syntax">]) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">CONSTANT_INDIRECT_TEXT:</span><span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-vc.html#SP1_7" class="named-paragraph-link"><span class="named-paragraph">Declare this as a textual constant</span><span class="named-paragraph-number">1.7</span></a></span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">CONSTANT_INDIRECT_LIST:</span><span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-vc.html#SP1_8" class="named-paragraph-link"><span class="named-paragraph">Declare this as a list constant</span><span class="named-paragraph-number">1.8</span></a></span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">CONSTANT_SUM_LIST:</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">CONSTANT_PRODUCT_LIST:</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">CONSTANT_DIFFERENCE_LIST:</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">CONSTANT_QUOTIENT_LIST:</span><span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-vc.html#SP1_9" class="named-paragraph-link"><span class="named-paragraph">Declare this as a computed constant</span><span class="named-paragraph-number">1.9</span></a></span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">CONSTANT_DIRECT:</span><span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-vc.html#SP1_10" class="named-paragraph-link"><span class="named-paragraph">Declare this as an explicit constant</span><span class="named-paragraph-number">1.10</span></a></span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">default:</span><span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"ungenerated constant format"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP1_1" class="paragraph-anchor"></a><b>§1.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Declare this constant as an action name</span><span class="named-paragraph-number">1.1</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">fa</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">-></span><span class="identifier-syntax">symbol_name</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Str::delete_first_character</span><span class="plain-syntax">(</span><span class="identifier-syntax">fa</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Str::delete_first_character</span><span class="plain-syntax">(</span><span class="identifier-syntax">fa</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cg2.html#SP7" class="function-link"><span class="function-syntax">Generators::new_action</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">fa</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-></span><span class="element-syntax">true_action_count</span><span class="plain-syntax">++);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">fa</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-></span><span class="element-syntax">actions</span><span class="plain-syntax">);</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="2-vc.html#SP1">§1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP1_2" class="paragraph-anchor"></a><b>§1.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Declare this constant as a fake action name</span><span class="named-paragraph-number">1.2</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">fa</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">-></span><span class="identifier-syntax">symbol_name</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Str::delete_first_character</span><span class="plain-syntax">(</span><span class="identifier-syntax">fa</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Str::delete_first_character</span><span class="plain-syntax">(</span><span class="identifier-syntax">fa</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cg2.html#SP7" class="function-link"><span class="function-syntax">Generators::new_action</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">fa</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><span class="constant-syntax">4096</span><span class="plain-syntax"> + </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-></span><span class="element-syntax">fake_action_count</span><span class="plain-syntax">++);</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="2-vc.html#SP1">§1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP1_3" class="paragraph-anchor"></a><b>§1.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Ignore this constant as part of the veneer</span><span class="named-paragraph-number">1.3</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> ;</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="2-vc.html#SP1">§1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP1_4" class="paragraph-anchor"></a><b>§1.4. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Declare this constant as a pseudo-object</span><span class="named-paragraph-number">1.4</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><a href="2-cg2.html#SP8" class="function-link"><span class="function-syntax">Generators::pseudo_object</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">InterSymbol::trans</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">));</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="2-vc.html#SP1">§1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP1_5" class="paragraph-anchor"></a><b>§1.5. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Declare this constant as a function</span><span class="named-paragraph-number">1.5</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><a href="2-vf.html#SP8" class="function-link"><span class="function-syntax">VanillaFunctions::declare_function</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">con_name</span><span class="plain-syntax">);</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="2-vc.html#SP1">§1</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP1_6" class="paragraph-anchor"></a><b>§1.6. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Declare this constant as the special UUID string array</span><span class="named-paragraph-number">1.6</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">ID</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">DATA_CONST_IFLD</span><span class="plain-syntax">];</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Inode::ID_to_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">ID</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="identifier-syntax">saved</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">content</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">length</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">content</span><span class="plain-syntax">, </span><span class="string-syntax">"UUID:</span><span class="comment-syntax">");</span>
|
|
<span class="string-syntax"> for (int i=0, L=Str::len(S); i<L; i++)</span>
|
|
<span class="string-syntax"> WRITE_TO(content, "</span><span class="plain-syntax">%</span><span class="identifier-syntax">c</span><span class="string-syntax">", Characters::toupper(Str::get_at(S, i)));</span>
|
|
<span class="string-syntax"> WRITE_TO(content, "</span><span class="plain-syntax">//</span><span class="string-syntax">");</span>
|
|
<span class="string-syntax"> WRITE_TO(length, "</span><span class="plain-syntax">%</span><span class="identifier-syntax">d</span><span class="string-syntax">", (int) Str::len(content));</span>
|
|
|
|
<span class="string-syntax"> Generators::begin_array(gen, I"</span><span class="identifier-syntax">UUID_ARRAY</span><span class="string-syntax">", NULL, NULL, BYTE_ARRAY_FORMAT, &saved);</span>
|
|
<span class="string-syntax"> Generators::array_entry(gen, length, BYTE_ARRAY_FORMAT);</span>
|
|
<span class="string-syntax"> LOOP_THROUGH_TEXT(pos, content) {</span>
|
|
<span class="string-syntax"> TEMPORARY_TEXT(ch)</span>
|
|
<span class="string-syntax"> WRITE_TO(ch, "</span><span class="character-syntax">'%c'</span><span class="string-syntax">", Str::get(pos));</span>
|
|
<span class="string-syntax"> Generators::array_entry(gen, ch, BYTE_ARRAY_FORMAT);</span>
|
|
<span class="string-syntax"> DISCARD_TEXT(ch)</span>
|
|
<span class="string-syntax"> }</span>
|
|
<span class="string-syntax"> Generators::end_array(gen, BYTE_ARRAY_FORMAT, &saved);</span>
|
|
<span class="string-syntax"> DISCARD_TEXT(length)</span>
|
|
<span class="string-syntax"> DISCARD_TEXT(content)</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="2-vc.html#SP1">§1</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_7" class="paragraph-anchor"></a><b>§1.7. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Declare this as a textual constant</span><span class="named-paragraph-number">1.7</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">ID</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">DATA_CONST_IFLD</span><span class="plain-syntax">];</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Inode::ID_to_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">ID</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-vc.html#SP3" class="function-link"><span class="function-syntax">VanillaConstants::defer_declaring_literal_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">S</span><span class="plain-syntax">, </span><span class="identifier-syntax">con_name</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="2-vc.html#SP1">§1</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_8" class="paragraph-anchor"></a><b>§1.8. </b>Inter supports four sorts of arrays, with behaviour as laid out in this 2x2 grid:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> | entries count 0, 1, 2,... | entry 0 is N, then entries count 1, 2, ..., N</span>
|
|
<span class="plain-syntax">-------------+-------------------------------+-----------------------------------------------</span>
|
|
<span class="plain-syntax">byte entries | BYTE_ARRAY_FORMAT | BUFFER_ARRAY_FORMAT</span>
|
|
<span class="plain-syntax">-------------+-------------------------------+-----------------------------------------------</span>
|
|
<span class="plain-syntax">word entries | WORD_ARRAY_FORMAT | TABLE_ARRAY_FORMAT</span>
|
|
<span class="plain-syntax">-------------+-------------------------------+-----------------------------------------------</span>
|
|
</pre>
|
|
<p class="commentary">In most cases, the entries in the list are then given in value pairs from <span class="extract"><span class="extract-syntax">DATA_CONST_IFLD</span></span>
|
|
to the end of the frame. However:
|
|
</p>
|
|
|
|
<ul class="items"><li>(a) <span class="extract"><span class="extract-syntax">DIVIDER_IVAL</span></span> entries are not real entries, but just places where comments
|
|
or line breaks could be placed to make the code prettier;
|
|
</li><li>(b) if an array assimilated from a kit has exactly one purported entry, then in
|
|
fact this should be interpreted as being that many blank entries. This number
|
|
must however be carefully evaluated, as it may be another constant name rather
|
|
than a literal, or may even be computed.
|
|
</li></ul>
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Declare this as a list constant</span><span class="named-paragraph-number">1.8</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">format</span><span class="plain-syntax"> = </span><span class="constant-syntax">WORD_ARRAY_FORMAT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">InterSymbol::read_annotation</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">BYTEARRAY_IANN</span><span class="plain-syntax">) == </span><span class="constant-syntax">1</span><span class="plain-syntax">) </span><span class="identifier-syntax">format</span><span class="plain-syntax"> = </span><span class="constant-syntax">BYTE_ARRAY_FORMAT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">InterSymbol::read_annotation</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">TABLEARRAY_IANN</span><span class="plain-syntax">) == </span><span class="constant-syntax">1</span><span class="plain-syntax">) </span><span class="identifier-syntax">format</span><span class="plain-syntax"> = </span><span class="constant-syntax">TABLE_ARRAY_FORMAT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">InterSymbol::read_annotation</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">BUFFERARRAY_IANN</span><span class="plain-syntax">) == </span><span class="constant-syntax">1</span><span class="plain-syntax">) </span><span class="identifier-syntax">format</span><span class="plain-syntax"> = </span><span class="constant-syntax">BUFFER_ARRAY_FORMAT</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">entry_count</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=</span><span class="identifier-syntax">DATA_CONST_IFLD</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="function-syntax"><P-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">extent</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">=</span><span class="identifier-syntax">i</span><span class="plain-syntax">+2)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] != </span><span class="identifier-syntax">DIVIDER_IVAL</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">entry_count</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">give_count</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">entry_count</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</span><span class="plain-syntax">) &&</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">InterSymbol::read_annotation</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">ASSIMILATED_IANN</span><span class="plain-syntax">) >= </span><span class="constant-syntax">0</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">val1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">DATA_CONST_IFLD</span><span class="plain-syntax">], </span><span class="identifier-syntax">val2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">DATA_CONST_IFLD</span><span class="plain-syntax">+1];</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">entry_count</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">Inter::Constant::evaluate</span><span class="plain-syntax">(</span><span class="identifier-syntax">InterPackage::scope_of</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">), </span><span class="identifier-syntax">val1</span><span class="plain-syntax">, </span><span class="identifier-syntax">val2</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">give_count</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="identifier-syntax">saved</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-cg2.html#SP10" class="function-link"><span class="function-syntax">Generators::begin_array</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">InterSymbol::trans</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">), </span><span class="identifier-syntax">con_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">format</span><span class="plain-syntax">, &</span><span class="identifier-syntax">saved</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">give_count</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP10" class="function-link"><span class="function-syntax">Generators::array_entries</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">entry_count</span><span class="plain-syntax">, </span><span class="identifier-syntax">format</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=</span><span class="identifier-syntax">DATA_CONST_IFLD</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="function-syntax"><P-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">extent</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">=</span><span class="identifier-syntax">i</span><span class="plain-syntax">+2) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] != </span><span class="identifier-syntax">DIVIDER_IVAL</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">entry</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg.html#SP11" class="function-link"><span class="function-syntax">CodeGen::select_temporary</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">entry</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg.html#SP16" class="function-link"><span class="function-syntax">CodeGen::pair</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">], </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">+1]);</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg.html#SP11" class="function-link"><span class="function-syntax">CodeGen::deselect_temporary</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP10" class="function-link"><span class="function-syntax">Generators::array_entry</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">entry</span><span class="plain-syntax">, </span><span class="identifier-syntax">format</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">entry</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP10" class="function-link"><span class="function-syntax">Generators::end_array</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">format</span><span class="plain-syntax">, &</span><span class="identifier-syntax">saved</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="2-vc.html#SP1">§1</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_9" class="paragraph-anchor"></a><b>§1.9. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Declare this as a computed constant</span><span class="named-paragraph-number">1.9</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP11" class="function-link"><span class="function-syntax">Generators::declare_constant</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">con_name</span><span class="plain-syntax">, </span><span class="constant-syntax">COMPUTED_GDCFORM</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="2-vc.html#SP1">§1</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP1_10" class="paragraph-anchor"></a><b>§1.10. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Declare this as an explicit constant</span><span class="named-paragraph-number">1.10</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP11" class="function-link"><span class="function-syntax">Generators::declare_constant</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">con_name</span><span class="plain-syntax">, </span><span class="constant-syntax">DATA_GDCFORM</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="2-vc.html#SP1">§1</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>When called by <a href="2-cg2.html#SP11" class="internal">Generators::declare_constant</a>, generators may if they choose
|
|
make use of the following convenient function for generating the value to which a
|
|
constant name is given.
|
|
</p>
|
|
|
|
<p class="commentary">Note that this assumes that the usual arithmetic operators and brackets can be
|
|
used in the syntax for literal quantities: e.g., it may produce <span class="extract"><span class="extract-syntax">(A + (3 * B))</span></span>
|
|
for constants <span class="extract"><span class="extract-syntax">A</span></span>, <span class="extract"><span class="extract-syntax">B</span></span>. If the generator is for a language which doesn't allow
|
|
that, it will have to make other arrangements.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaConstants::definition_value</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">VanillaConstants::definition_value</span></span>:<br/>Inform 6 Constants - <a href="4-i6c.html#SP2">§2</a>, <a href="4-i6c.html#SP2_4">§2.4</a>, <a href="4-i6c.html#SP2_5">§2.5</a><br/>C Namespace - <a href="5-cnm.html#SP7">§7</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">form</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">con_name</span><span class="plain-syntax">-></span><span class="identifier-syntax">definition</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::current</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">form</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">RAW_GDCFORM:</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">) > </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP19" class="function-link"><span class="function-syntax">Generators::compile_literal_number</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="constant-syntax">1</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">MANGLED_GDCFORM:</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">) > </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP15" class="function-link"><span class="function-syntax">Generators::mangle</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP19" class="function-link"><span class="function-syntax">Generators::compile_literal_number</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="constant-syntax">1</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">DATA_GDCFORM:</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">val1</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">DATA_CONST_IFLD</span><span class="plain-syntax">];</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">val2</span><span class="plain-syntax"> = </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">DATA_CONST_IFLD</span><span class="plain-syntax"> + </span><span class="constant-syntax">1</span><span class="plain-syntax">];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">val1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">LITERAL_IVAL</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">InterSymbol::read_annotation</span><span class="plain-syntax">(</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">HEX_IANN</span><span class="plain-syntax">)))</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP19" class="function-link"><span class="function-syntax">Generators::compile_literal_number</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">val2</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg.html#SP16" class="function-link"><span class="function-syntax">CodeGen::pair</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">val1</span><span class="plain-syntax">, </span><span class="identifier-syntax">val2</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">COMPUTED_GDCFORM:</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"("</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=</span><span class="identifier-syntax">DATA_CONST_IFLD</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="function-syntax"><P-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">extent</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">=</span><span class="identifier-syntax">i</span><span class="plain-syntax">+2) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax">></span><span class="identifier-syntax">DATA_CONST_IFLD</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">FORMAT_CONST_IFLD</span><span class="plain-syntax">] == </span><span class="identifier-syntax">CONSTANT_SUM_LIST</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" + "</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">FORMAT_CONST_IFLD</span><span class="plain-syntax">] == </span><span class="identifier-syntax">CONSTANT_PRODUCT_LIST</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" * "</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">FORMAT_CONST_IFLD</span><span class="plain-syntax">] == </span><span class="identifier-syntax">CONSTANT_DIFFERENCE_LIST</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" - "</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">FORMAT_CONST_IFLD</span><span class="plain-syntax">] == </span><span class="identifier-syntax">CONSTANT_QUOTIENT_LIST</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" / "</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">bracket</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] == </span><span class="identifier-syntax">LITERAL_IVAL</span><span class="plain-syntax">) ||</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">Inter::Types::pair_holds_symbol</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">], </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">+1]))) </span><span class="identifier-syntax">bracket</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">bracket</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"("</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg.html#SP16" class="function-link"><span class="function-syntax">CodeGen::pair</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">], </span><span class="identifier-syntax">P</span><span class="plain-syntax">-></span><span class="identifier-syntax">W</span><span class="plain-syntax">.</span><span class="identifier-syntax">instruction</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">+1]);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">bracket</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">")"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">")"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">LITERAL_TEXT_GDCFORM:</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP19" class="function-link"><span class="function-syntax">Generators::compile_literal_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>During the above process, a constant set equal to a text literal is not
|
|
immediately declared: instead, the following mechanism is used to stash it for
|
|
later.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">literal_content</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
|
|
<span class="plain-syntax">} </span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaConstants::defer_declaring_literal_text</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">VanillaConstants::defer_declaring_literal_text</span></span>:<br/><a href="2-vc.html#SP1_7">§1.7</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">con_name</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tlh</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">tlh</span><span class="plain-syntax">-></span><span class="element-syntax">literal_content</span><span class="plain-syntax"> = </span><span class="identifier-syntax">S</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">tlh</span><span class="plain-syntax">-></span><span class="element-syntax">con_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">con_name</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">tlh</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-></span><span class="element-syntax">text_literals</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>The structure text_literal_holder is private to this section.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>And now it's later. We go through all of the stashed text literals, and sort
|
|
them into alphabetical order; and then declare them. What this whole business
|
|
achieves, then, is to declare text constants in alphabetical order rather than
|
|
in tree order.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaConstants::declare_text_literals</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">VanillaConstants::declare_text_literals</span></span>:<br/>Vanilla - <a href="2-vnl.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">no_tlh</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">-></span><span class="element-syntax">text_literals</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">no_tlh</span><span class="plain-syntax"> > </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax"> **</span><span class="identifier-syntax">sorted</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax"> **)</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">Memory::calloc</span><span class="plain-syntax">(</span><span class="identifier-syntax">no_tlh</span><span class="plain-syntax">, </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax"> *), </span><span class="constant-syntax">CODE_GENERATION_MREASON</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tlh</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">tlh</span><span class="plain-syntax">, </span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-></span><span class="element-syntax">text_literals</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">sorted</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">++] = </span><span class="identifier-syntax">tlh</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">qsort</span><span class="plain-syntax">(</span><span class="identifier-syntax">sorted</span><span class="plain-syntax">, (</span><span class="identifier-syntax">size_t</span><span class="plain-syntax">) </span><span class="identifier-syntax">no_tlh</span><span class="plain-syntax">, </span><span class="reserved-syntax">sizeof</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax"> *),</span>
|
|
<span class="plain-syntax"> </span><a href="2-vc.html#SP5" class="function-link"><span class="function-syntax">VanillaConstants::compare_tlh</span></a><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">no_tlh</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tlh</span><span class="plain-syntax"> = </span><span class="identifier-syntax">sorted</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">];</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP11" class="function-link"><span class="function-syntax">Generators::declare_constant</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">tlh</span><span class="plain-syntax">-></span><span class="element-syntax">con_name</span><span class="plain-syntax">, </span><span class="constant-syntax">LITERAL_TEXT_GDCFORM</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">tlh</span><span class="plain-syntax">-></span><span class="element-syntax">literal_content</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>Note that <span class="extract"><span class="extract-syntax">Str::cmp</span></span> is a case-sensitive comparison, so <span class="extract"><span class="extract-syntax">Zebra</span></span> will come
|
|
before <span class="extract"><span class="extract-syntax">armadillo</span></span>, for example, <span class="extract"><span class="extract-syntax">Z</span></span> being before <span class="extract"><span class="extract-syntax">a</span></span> in Unicode.
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</p>
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|
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|
<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaConstants::compare_tlh</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">VanillaConstants::compare_tlh</span></span>:<br/><a href="2-vc.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">elem1</span><span class="plain-syntax">, </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">elem2</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax"> **</span><span class="identifier-syntax">e1</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">elem1</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax"> **</span><span class="identifier-syntax">e2</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">const</span><span class="plain-syntax"> </span><span class="reserved-syntax">text_literal_holder</span><span class="plain-syntax"> **) </span><span class="identifier-syntax">elem2</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((*</span><span class="identifier-syntax">e1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (*</span><span class="identifier-syntax">e2</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"Disaster while sorting text literals"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">s1</span><span class="plain-syntax"> = (*</span><span class="identifier-syntax">e1</span><span class="plain-syntax">)-></span><span class="element-syntax">literal_content</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">s2</span><span class="plain-syntax"> = (*</span><span class="identifier-syntax">e2</span><span class="plain-syntax">)-></span><span class="element-syntax">literal_content</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">Str::cmp</span><span class="plain-syntax">(</span><span class="identifier-syntax">s1</span><span class="plain-syntax">, </span><span class="identifier-syntax">s2</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
|
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</pre>
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<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>The remainder of this section is given over to a utility function which
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|
generators may want to use: it turns an Inter-notation text for a real number
|
|
into an unsigned 32-bit integer which can represent that number at runtime
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(provided we are on a 32-bit computer: the Z-machine need not apply).
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</p>
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<p class="commentary">No error messages should be printed, of course, because the syntax should have
|
|
been checked before the text here entered the Inter hierarchy.
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</p>
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<p class="commentary">The code below is adapted from additions made by Andrew Plotkin to the Inform 6
|
|
compiler to accommodate floating-point arithmetic.
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</p>
|
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaConstants::textual_real_to_uint32</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">VanillaConstants::textual_real_to_uint32</span></span>:<br/>C Literals - <a href="5-clt.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">T</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">at</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">T</span><span class="plain-syntax">, </span><span class="identifier-syntax">at</span><span class="plain-syntax">++);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">expo</span><span class="plain-syntax">=0; </span><span class="reserved-syntax">double</span><span class="plain-syntax"> </span><span class="identifier-syntax">intv</span><span class="plain-syntax">=0, </span><span class="identifier-syntax">fracv</span><span class="plain-syntax">=0;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">expocount</span><span class="plain-syntax">=0, </span><span class="identifier-syntax">intcount</span><span class="plain-syntax">=0, </span><span class="identifier-syntax">fraccount</span><span class="plain-syntax">=0, </span><span class="identifier-syntax">signbit</span><span class="plain-syntax">=0;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> == </span><span class="character-syntax">'-'</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">signbit</span><span class="plain-syntax"> = </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">T</span><span class="plain-syntax">, </span><span class="identifier-syntax">at</span><span class="plain-syntax">++);</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> == </span><span class="character-syntax">'+'</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">signbit</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">T</span><span class="plain-syntax">, </span><span class="identifier-syntax">at</span><span class="plain-syntax">++);</span>
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<span class="plain-syntax"> }</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><a href="2-vc.html#SP6" class="function-link"><span class="function-syntax">VanillaConstants::character_digit_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">lookahead</span><span class="plain-syntax">) < </span><span class="constant-syntax">10</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">intv</span><span class="plain-syntax"> = </span><span class="constant-syntax">10</span><span class="plain-syntax">.0*</span><span class="identifier-syntax">intv</span><span class="plain-syntax"> + </span><a href="2-vc.html#SP6" class="function-link"><span class="function-syntax">VanillaConstants::character_digit_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">lookahead</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">intcount</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">T</span><span class="plain-syntax">, </span><span class="identifier-syntax">at</span><span class="plain-syntax">++);</span>
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|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> == </span><span class="character-syntax">'.'</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">double</span><span class="plain-syntax"> </span><span class="identifier-syntax">fracpow</span><span class="plain-syntax"> = </span><span class="constant-syntax">1</span><span class="plain-syntax">.0;</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">T</span><span class="plain-syntax">, </span><span class="identifier-syntax">at</span><span class="plain-syntax">++);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><a href="2-vc.html#SP6" class="function-link"><span class="function-syntax">VanillaConstants::character_digit_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">lookahead</span><span class="plain-syntax">) < </span><span class="constant-syntax">10</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">fracpow</span><span class="plain-syntax"> *= </span><span class="constant-syntax">0</span><span class="plain-syntax">.1;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">fracv</span><span class="plain-syntax"> = </span><span class="identifier-syntax">fracv</span><span class="plain-syntax"> + </span><span class="identifier-syntax">fracpow</span><span class="plain-syntax">*</span><a href="2-vc.html#SP6" class="function-link"><span class="function-syntax">VanillaConstants::character_digit_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">lookahead</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">fraccount</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">T</span><span class="plain-syntax">, </span><span class="identifier-syntax">at</span><span class="plain-syntax">++);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> == </span><span class="character-syntax">'e'</span><span class="plain-syntax"> || </span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> == </span><span class="character-syntax">'E'</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">exposign</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">T</span><span class="plain-syntax">, </span><span class="identifier-syntax">at</span><span class="plain-syntax">++);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> == </span><span class="character-syntax">'+'</span><span class="plain-syntax"> || </span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> == </span><span class="character-syntax">'-'</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">exposign</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> == </span><span class="character-syntax">'-'</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">T</span><span class="plain-syntax">, </span><span class="identifier-syntax">at</span><span class="plain-syntax">++);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><a href="2-vc.html#SP6" class="function-link"><span class="function-syntax">VanillaConstants::character_digit_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">lookahead</span><span class="plain-syntax">) < </span><span class="constant-syntax">10</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">expo</span><span class="plain-syntax"> = </span><span class="constant-syntax">10</span><span class="plain-syntax">*</span><span class="identifier-syntax">expo</span><span class="plain-syntax"> + </span><a href="2-vc.html#SP6" class="function-link"><span class="function-syntax">VanillaConstants::character_digit_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">lookahead</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">expocount</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">lookahead</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">T</span><span class="plain-syntax">, </span><span class="identifier-syntax">at</span><span class="plain-syntax">++);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">expocount</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">STDERR</span><span class="plain-syntax">, </span><span class="string-syntax">"Floating-point literal '%S' must have digits after the 'e'"</span><span class="plain-syntax">, </span><span class="identifier-syntax">T</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"bad floating-point literal"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">exposign</span><span class="plain-syntax">) { </span><span class="identifier-syntax">expo</span><span class="plain-syntax"> = -</span><span class="identifier-syntax">expo</span><span class="plain-syntax">; }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">intcount</span><span class="plain-syntax"> + </span><span class="identifier-syntax">fraccount</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">STDERR</span><span class="plain-syntax">, </span><span class="string-syntax">"Floating-point literal '%S' must have digits"</span><span class="plain-syntax">, </span><span class="identifier-syntax">T</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"bad floating-point literal"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-vc.html#SP8" class="function-link"><span class="function-syntax">VanillaConstants::real_components_to_uint32</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">signbit</span><span class="plain-syntax">, </span><span class="identifier-syntax">intv</span><span class="plain-syntax">, </span><span class="identifier-syntax">fracv</span><span class="plain-syntax">, </span><span class="identifier-syntax">expo</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaConstants::character_digit_value</span><span class="plain-syntax">(</span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">c</span><span class="plain-syntax"> >= </span><span class="character-syntax">'0'</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">c</span><span class="plain-syntax"> <= </span><span class="character-syntax">'9'</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> - </span><span class="character-syntax">'0'</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">10</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b>And this returns 10 raised to the power <span class="extract"><span class="extract-syntax">expo</span></span>, which is an integer. Andrew
|
|
Plotkin refers to this as "cheap" because it avoids the C library <span class="extract"><span class="extract-syntax">pow10</span></span>,
|
|
which is awkward on some platforms.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">#</span><span class="identifier-syntax">ifndef</span><span class="plain-syntax"> </span><span class="identifier-syntax">POW10_RANGE</span>
|
|
<span class="plain-syntax">#</span><span class="identifier-syntax">define</span><span class="plain-syntax"> </span><span class="identifier-syntax">POW10_RANGE</span><span class="plain-syntax"> (8)</span>
|
|
<span class="plain-syntax">#</span><span class="identifier-syntax">endif</span>
|
|
|
|
<span class="reserved-syntax">double</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaConstants::pow10_cheap</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">VanillaConstants::pow10_cheap</span></span>:<br/><a href="2-vc.html#SP8">§8</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">expo</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">static</span><span class="plain-syntax"> </span><span class="reserved-syntax">double</span><span class="plain-syntax"> </span><span class="identifier-syntax">powers</span><span class="plain-syntax">[</span><span class="identifier-syntax">POW10_RANGE</span><span class="plain-syntax">*2+1] = {</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax">.00000001, </span><span class="constant-syntax">0</span><span class="plain-syntax">.0000001, </span><span class="constant-syntax">0</span><span class="plain-syntax">.000001, </span><span class="constant-syntax">0</span><span class="plain-syntax">.00001, </span><span class="constant-syntax">0</span><span class="plain-syntax">.0001, </span><span class="constant-syntax">0</span><span class="plain-syntax">.001, </span><span class="constant-syntax">0</span><span class="plain-syntax">.01, </span><span class="constant-syntax">0</span><span class="plain-syntax">.1,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">1</span><span class="plain-syntax">.0,</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">10</span><span class="plain-syntax">.0, </span><span class="constant-syntax">100</span><span class="plain-syntax">.0, </span><span class="constant-syntax">1000</span><span class="plain-syntax">.0, </span><span class="constant-syntax">10000</span><span class="plain-syntax">.0, </span><span class="constant-syntax">100000</span><span class="plain-syntax">.0, </span><span class="constant-syntax">1000000</span><span class="plain-syntax">.0, </span><span class="constant-syntax">10000000</span><span class="plain-syntax">.0, </span><span class="constant-syntax">100000000</span><span class="plain-syntax">.0</span>
|
|
<span class="plain-syntax"> };</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">double</span><span class="plain-syntax"> </span><span class="identifier-syntax">res</span><span class="plain-syntax"> = </span><span class="constant-syntax">1</span><span class="plain-syntax">.0;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">expo</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (; </span><span class="identifier-syntax">expo</span><span class="plain-syntax"> < -</span><span class="identifier-syntax">POW10_RANGE</span><span class="plain-syntax">; </span><span class="identifier-syntax">expo</span><span class="plain-syntax"> += </span><span class="identifier-syntax">POW10_RANGE</span><span class="plain-syntax">) </span><span class="identifier-syntax">res</span><span class="plain-syntax"> *= </span><span class="identifier-syntax">powers</span><span class="plain-syntax">[0];</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">res</span><span class="plain-syntax"> * </span><span class="identifier-syntax">powers</span><span class="plain-syntax">[</span><span class="identifier-syntax">POW10_RANGE</span><span class="plain-syntax">+</span><span class="identifier-syntax">expo</span><span class="plain-syntax">];</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (; </span><span class="identifier-syntax">expo</span><span class="plain-syntax"> > </span><span class="identifier-syntax">POW10_RANGE</span><span class="plain-syntax">; </span><span class="identifier-syntax">expo</span><span class="plain-syntax"> -= </span><span class="identifier-syntax">POW10_RANGE</span><span class="plain-syntax">) </span><span class="identifier-syntax">res</span><span class="plain-syntax"> *= </span><span class="identifier-syntax">powers</span><span class="plain-syntax">[</span><span class="identifier-syntax">POW10_RANGE</span><span class="plain-syntax">*2];</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">res</span><span class="plain-syntax"> * </span><span class="identifier-syntax">powers</span><span class="plain-syntax">[</span><span class="identifier-syntax">POW10_RANGE</span><span class="plain-syntax">+</span><span class="identifier-syntax">expo</span><span class="plain-syntax">];</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. </b>Finally, this function returns the IEEE-754 single-precision encoding of a
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floating-point number from its various components.
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</p>
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<p class="commentary">See <a href="http://www.psc.edu/general/software/packages/ieee/ieee.php" class="external">http://www.psc.edu/general/software/packages/ieee/ieee.php</a> for an explanation.
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</p>
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<p class="commentary">If the magnitude is too large (beyond about 3.4e+38), this returns
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an infinite value (0x7f800000 or 0xff800000). If the magnitude is too
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small (below about 1e-45), this returns a zero value (0x00000000 or
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0x80000000). If any of the inputs are NaN, this returns NaN.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaConstants::real_components_to_uint32</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">VanillaConstants::real_components_to_uint32</span></span>:<br/><a href="2-vc.html#SP6">§6</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">signbit</span><span class="plain-syntax">, </span><span class="reserved-syntax">double</span><span class="plain-syntax"> </span><span class="identifier-syntax">intv</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">double</span><span class="plain-syntax"> </span><span class="identifier-syntax">fracv</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">expo</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">double</span><span class="plain-syntax"> </span><span class="identifier-syntax">absval</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">intv</span><span class="plain-syntax"> + </span><span class="identifier-syntax">fracv</span><span class="plain-syntax">) * </span><a href="2-vc.html#SP7" class="function-link"><span class="function-syntax">VanillaConstants::pow10_cheap</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">expo</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">sign</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">signbit</span><span class="plain-syntax"> ? </span><span class="constant-syntax">0x80000000</span><span class="plain-syntax"> : </span><span class="constant-syntax">0x0</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">isinf</span><span class="plain-syntax">(</span><span class="identifier-syntax">absval</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">sign</span><span class="plain-syntax"> | </span><span class="constant-syntax">0x7f800000</span><span class="plain-syntax">; </span><span class="comment-syntax"> infinity</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">isnan</span><span class="plain-syntax">(</span><span class="identifier-syntax">absval</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">sign</span><span class="plain-syntax"> | </span><span class="constant-syntax">0x7fc00000</span><span class="plain-syntax">; </span><span class="comment-syntax"> NaN</span>
|
|
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">double</span><span class="plain-syntax"> </span><span class="identifier-syntax">mant</span><span class="plain-syntax"> = </span><span class="identifier-syntax">frexp</span><span class="plain-syntax">(</span><span class="identifier-syntax">absval</span><span class="plain-syntax">, &</span><span class="identifier-syntax">expo</span><span class="plain-syntax">);</span>
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|
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<span class="plain-syntax"> </span><span class="comment-syntax"> Normalize mantissa to be in the range [1.0, 2.0)</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (0.5 <= </span><span class="identifier-syntax">mant</span><span class="plain-syntax"> && </span><span class="identifier-syntax">mant</span><span class="plain-syntax"> < </span><span class="constant-syntax">1</span><span class="plain-syntax">.0) {</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">mant</span><span class="plain-syntax"> *= </span><span class="constant-syntax">2</span><span class="plain-syntax">.0;</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">expo</span><span class="plain-syntax">--;</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">mant</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">.0) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">expo</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">sign</span><span class="plain-syntax"> | </span><span class="constant-syntax">0x7f800000</span><span class="plain-syntax">; </span><span class="comment-syntax"> infinity</span>
|
|
<span class="plain-syntax"> }</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">expo</span><span class="plain-syntax"> >= </span><span class="constant-syntax">128</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">sign</span><span class="plain-syntax"> | </span><span class="constant-syntax">0x7f800000</span><span class="plain-syntax">; </span><span class="comment-syntax"> infinity</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">expo</span><span class="plain-syntax"> < -126) {</span>
|
|
<span class="plain-syntax"> </span><span class="comment-syntax"> Denormalized (very small) number</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">mant</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ldexp</span><span class="plain-syntax">(</span><span class="identifier-syntax">mant</span><span class="plain-syntax">, </span><span class="constant-syntax">126</span><span class="plain-syntax"> + </span><span class="identifier-syntax">expo</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">expo</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (!(</span><span class="identifier-syntax">expo</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax"> && </span><span class="identifier-syntax">mant</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">.0)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">expo</span><span class="plain-syntax"> += </span><span class="constant-syntax">127</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">mant</span><span class="plain-syntax"> -= </span><span class="constant-syntax">1</span><span class="plain-syntax">.0; </span><span class="comment-syntax"> Get rid of leading 1</span>
|
|
<span class="plain-syntax"> }</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">mant</span><span class="plain-syntax"> *= </span><span class="constant-syntax">8388608</span><span class="plain-syntax">.0; </span><span class="comment-syntax"> 2^23</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">fbits</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax">)(</span><span class="identifier-syntax">mant</span><span class="plain-syntax"> + </span><span class="constant-syntax">0</span><span class="plain-syntax">.5); </span><span class="comment-syntax"> round mant to nearest int</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">fbits</span><span class="plain-syntax"> >> </span><span class="constant-syntax">23</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="comment-syntax"> The carry propagated out of a string of 23 1 bits.</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">fbits</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">expo</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">expo</span><span class="plain-syntax"> >= </span><span class="constant-syntax">255</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">sign</span><span class="plain-syntax"> | </span><span class="constant-syntax">0x7f800000</span><span class="plain-syntax">; </span><span class="comment-syntax"> infinity</span>
|
|
<span class="plain-syntax"> }</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> (</span><span class="identifier-syntax">sign</span><span class="plain-syntax">) | ((</span><span class="identifier-syntax">uint32_t</span><span class="plain-syntax">)(</span><span class="identifier-syntax">expo</span><span class="plain-syntax"> << </span><span class="constant-syntax">23</span><span class="plain-syntax">)) | (</span><span class="identifier-syntax">fbits</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
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