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<!--Weave of 'Vanilla Functions' 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 Functions</b></li></ul></div>
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<p class="purpose">How the vanilla code generation strategy declares functions.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>The following traverses the Inter tree to discover all of the functions
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defined within it, and does two important things for each:
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</p>
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<ul class="items"><li>(a) Assigns it a <a href="2-vf.html#SP3" class="internal">vanilla_function</a> of metadata, and then
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</li><li>(b) Calls <a href="2-cg2.html#SP6" class="internal">Generators::predeclare_function</a> to let the generator know that
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the function exists. Not all target languages require functions to be predeclared,
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so generators can if they choose ignore this.
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</li></ul>
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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">VanillaFunctions::predeclare_functions</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">VanillaFunctions::predeclare_functions</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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">InterTree::traverse</span><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">-></span><span class="element-syntax">from</span><span class="plain-syntax">, </span><a href="2-vf.html#SP2" class="function-link"><span class="function-syntax">VanillaFunctions::predeclare_this</span></a><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">CONSTANT_IST</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="SP2" class="paragraph-anchor"></a><b>§2. </b></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">VanillaFunctions::predeclare_this</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">VanillaFunctions::predeclare_this</span></span>:<br/><a href="2-vf.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</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="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">state</span><span class="plain-syntax">) {</span>
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<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">code_generation</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">state</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">constant_s</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">Inter::Constant::is_routine</span><span class="plain-syntax">(</span><span class="identifier-syntax">constant_s</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">vanilla_function</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vf</span><span class="plain-syntax"> = </span><a href="2-vf.html#SP6" class="function-link"><span class="function-syntax">VanillaFunctions::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">constant_s</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cg2.html#SP6" class="function-link"><span class="function-syntax">Generators::predeclare_function</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">vf</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="SP3" class="paragraph-anchor"></a><b>§3. </b>Each function has metadata as follows. Note that:
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</p>
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<ul class="items"><li>(a) Phrase syntax will only exist for functions which originated in Inform 7
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source text; so for functions coming from kits, <span class="extract"><span class="extract-syntax">phrase_syntax</span></span> will be empty
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and <span class="extract"><span class="extract-syntax">formal_arity</span></span> will be 0.
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</li><li>(b) For I7 functions, <span class="extract"><span class="extract-syntax">formal_arity</span></span> will be the number of arguments in the
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phrase preamble.
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</li><li>(c) For all functions, <span class="extract"><span class="extract-syntax">max_arity</span></span> is the total number of local variables in
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the function, and that is by definition the largest number of arguments which
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could possibly be passed to this function by a call. Note that it will always
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be true that <span class="extract"><span class="extract-syntax">max_arity >= formal_arity</span></span>.
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</li><li>(d) Calling conventions for Inter functions are not entirely simple: see
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<a href="5-cfm.html" class="internal">C Function Model</a> for discussion of how they differ from regular C functions.
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In particular, any function with a local variable called <span class="extract"><span class="extract-syntax">_vararg_count</span></span> is
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called with a variable number of arguments, placed on the stack before the call,
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rather than with arguments placed into local variables in the usual way.
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</li></ul>
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<pre class="displayed-code all-displayed-code code-font">
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<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">vanilla_function</span><span class="plain-syntax"> {</span>
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<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">identifier</span><span class="plain-syntax">;</span>
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<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">phrase_syntax</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">locals</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">text_stream</span></span><span class="comment-syntax">, the names only</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">function_body</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">takes_variable_arguments</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">max_arity</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">formal_arity</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">vanilla_function</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure vanilla_function is accessed in 2/vi, 4/i6c2, 5/clt, 5/cfm and here.</li></ul>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>This produces a synopsis of the phrase syntax which can be used in an identifier.
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For example, for "To award (N - number) points to (P - person)", the following
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writes <span class="extract"><span class="extract-syntax">award_X_points_to_X</span></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="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaFunctions::syntax_synopsis</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">VanillaFunctions::syntax_synopsis</span></span>:<br/>C Function Model - <a href="5-cfm.html#SP14_3">§14.3</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">vanilla_function</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vf</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">md</span><span class="plain-syntax"> = </span><span class="identifier-syntax">vf</span><span class="plain-syntax">-></span><span class="element-syntax">phrase_syntax</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="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=3, </span><span class="identifier-syntax">bracketed</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">md</span><span class="plain-syntax">); </span><span class="identifier-syntax">i</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">c</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::get_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">md</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</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">bracketed</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">c</span><span class="plain-syntax"> == </span><span class="character-syntax">')'</span><span class="plain-syntax">) </span><span class="identifier-syntax">bracketed</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">else</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">'('</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">PUT</span><span class="plain-syntax">(</span><span class="character-syntax">'X'</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">bracketed</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</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">Characters::isalpha</span><span class="plain-syntax">(</span><span class="identifier-syntax">c</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">PUT</span><span class="plain-syntax">(</span><span class="identifier-syntax">c</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="identifier-syntax">PUT</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>
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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="SP5" class="paragraph-anchor"></a><b>§5. </b>And on the same example, this would return 2:
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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">int</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaFunctions::formal_arity</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">VanillaFunctions::formal_arity</span></span>:<br/><a href="2-vf.html#SP6">§6</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">vanilla_function</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vf</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">A</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">LOOP_THROUGH_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="identifier-syntax">vf</span><span class="plain-syntax">-></span><span class="element-syntax">phrase_syntax</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">Str::get</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</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">A</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">A</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>So, then:
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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">vanilla_function</span><span class="plain-syntax"> *</span><span class="function-syntax">VanillaFunctions::new</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">VanillaFunctions::new</span></span>:<br/><a href="2-vf.html#SP2">§2</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_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">fn_s</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::container</span><span class="plain-syntax">(</span><span class="identifier-syntax">fn_s</span><span class="plain-syntax">-></span><span class="identifier-syntax">definition</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">PP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::parent</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">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i7_syntax</span><span class="plain-syntax"> = </span><span class="identifier-syntax">PP</span><span class="plain-syntax">?(</span><span class="identifier-syntax">Metadata::read_optional_textual</span><span class="plain-syntax">(</span><span class="identifier-syntax">PP</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"^phrase_syntax"</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="reserved-syntax">vanilla_function</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vf</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">vanilla_function</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">vf</span><span class="plain-syntax">-></span><span class="element-syntax">takes_variable_arguments</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="identifier-syntax">vf</span><span class="plain-syntax">-></span><span class="element-syntax">identifier</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">InterSymbol::trans</span><span class="plain-syntax">(</span><span class="identifier-syntax">fn_s</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">vf</span><span class="plain-syntax">-></span><span class="element-syntax">locals</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">vf</span><span class="plain-syntax">-></span><span class="element-syntax">phrase_syntax</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">i7_syntax</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">code_block</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Inter::Constant::code_block</span><span class="plain-syntax">(</span><span class="identifier-syntax">fn_s</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">vf</span><span class="plain-syntax">-></span><span class="element-syntax">function_body</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::head</span><span class="plain-syntax">(</span><span class="identifier-syntax">code_block</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">fn_s</span><span class="plain-syntax">-></span><span class="identifier-syntax">translation_data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">STORE_POINTER_vanilla_function</span><span class="plain-syntax">(</span><span class="identifier-syntax">vf</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-vf.html#SP7" class="function-link"><span class="function-syntax">VanillaFunctions::seek_locals</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">vf</span><span class="plain-syntax">-></span><span class="element-syntax">function_body</span><span class="plain-syntax">, </span><span class="identifier-syntax">vf</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">vf</span><span class="plain-syntax">-></span><span class="element-syntax">max_arity</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">vf</span><span class="plain-syntax">-></span><span class="element-syntax">locals</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">vf</span><span class="plain-syntax">-></span><span class="element-syntax">formal_arity</span><span class="plain-syntax"> = </span><a href="2-vf.html#SP5" class="function-link"><span class="function-syntax">VanillaFunctions::formal_arity</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">vf</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">vf</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="SP7" class="paragraph-anchor"></a><b>§7. </b>This performs a local traverse of the body of the function to look for local
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variable declarations.
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</p>
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<p class="commentary">Note that we look at <span class="extract"><span class="extract-syntax">InterSymbol::identifier(local_s)</span></span> not <span class="extract"><span class="extract-syntax">InterSymbol::trans(local_s)</span></span>
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when checking for <span class="extract"><span class="extract-syntax">_vararg_count</span></span> because the translated name may have been mangled
|
|
in some way by the generator. (As indeed the C generator does, mangling this to
|
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<span class="extract"><span class="extract-syntax">local__vararg_count</span></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="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaFunctions::seek_locals</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">VanillaFunctions::seek_locals</span></span>:<br/><a href="2-vf.html#SP6">§6</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="reserved-syntax">vanilla_function</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vf</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">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">ID_IFLD</span><span class="plain-syntax">] == </span><span class="identifier-syntax">LOCAL_IST</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_package</span><span class="plain-syntax"> *</span><span class="identifier-syntax">pack</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterPackage::container</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">local_s</span><span class="plain-syntax"> =</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">InterSymbolsTable::symbol_from_ID_in_package</span><span class="plain-syntax">(</span><span class="identifier-syntax">pack</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">DEFN_LOCAL_IFLD</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">InterSymbol::trans</span><span class="plain-syntax">(</span><span class="identifier-syntax">local_s</span><span class="plain-syntax">), </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax">, </span><span class="identifier-syntax">vf</span><span class="plain-syntax">-></span><span class="element-syntax">locals</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">Str::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">InterSymbol::identifier</span><span class="plain-syntax">(</span><span class="identifier-syntax">local_s</span><span class="plain-syntax">), </span><span class="identifier-syntax">I</span><span class="string-syntax">"_vararg_count"</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">vf</span><span class="plain-syntax">-></span><span class="element-syntax">takes_variable_arguments</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="identifier-syntax">LOOP_THROUGH_INTER_CHILDREN</span><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">) </span><a href="2-vf.html#SP7" class="function-link"><span class="function-syntax">VanillaFunctions::seek_locals</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="identifier-syntax">vf</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. </b>Note that a pointer to <span class="extract"><span class="extract-syntax">vf</span></span> is cached with each function name symbol for speed:
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|
</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">VanillaFunctions::declare_function</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">VanillaFunctions::declare_function</span></span>:<br/>Vanilla Constants - <a href="2-vc.html#SP1_5">§1.5</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_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">fn_s</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">vanilla_function</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vf</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_vanilla_function</span><span class="plain-syntax">(</span><span class="identifier-syntax">fn_s</span><span class="plain-syntax">-></span><span class="identifier-syntax">translation_data</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP9" class="function-link"><span class="function-syntax">Generators::declare_function</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">vf</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>§9. </b></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">VanillaFunctions::invoke_function</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">VanillaFunctions::invoke_function</span></span>:<br/>Vanilla Code - <a href="2-vc2.html#SP3_2">§3.2</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_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">fn_s</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="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">void_context</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">D</span><span class="plain-syntax"> = </span><span class="identifier-syntax">fn_s</span><span class="plain-syntax">-></span><span class="identifier-syntax">definition</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">D</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">D</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">ID_IFLD</span><span class="plain-syntax">] == </span><span class="identifier-syntax">CONSTANT_IST</span><span class="plain-syntax">) &&</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">D</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_DIRECT</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">D</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">D</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">Inter::Types::pair_holds_symbol</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">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">S</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterSymbolsTable::symbol_from_data_pair</span><span class="plain-syntax">(</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="identifier-syntax">InterPackage::scope_of</span><span class="plain-syntax">(</span><span class="identifier-syntax">D</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">S</span><span class="plain-syntax">) </span><span class="identifier-syntax">fn_s</span><span class="plain-syntax"> = </span><span class="identifier-syntax">S</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">vanilla_function</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vf</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_vanilla_function</span><span class="plain-syntax">(</span><span class="identifier-syntax">fn_s</span><span class="plain-syntax">-></span><span class="identifier-syntax">translation_data</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">vf</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 translation data"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP14" class="function-link"><span class="function-syntax">Generators::invoke_function</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">vf</span><span class="plain-syntax">, </span><span class="identifier-syntax">void_context</span><span class="plain-syntax">);</span>
|
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<span class="plain-syntax">}</span>
|
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</pre>
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