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Graham Nelson 8060a44887 Module identities more clearly emerging
2021-05-03 23:49:40 +01:00

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>Going</title>
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7</a></li><li><a href="index.html">runtime</a></li><li><a href="index.html#7">Chapter 7: Actions</a></li><li><b>Going</b></li></ul></div>
<p class="purpose">Tweaks to compiling APs for the going action.</p>
<ul class="toc"><li><a href="7-gng.html#SP1">&#167;1. Compiling action tries</a></li></ul><hr class="tocbar">
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. Compiling action tries. </b></p>
<pre class="definitions code-font"><span class="definition-keyword">enum</span> <span class="constant-syntax">NOWHERE_CPMC</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">SOMEWHERE_CPMC</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">NOT_NOWHERE_CPMC</span>
</pre>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">RTGoing::set_pattern_match_requirements</span><span class="plain-syntax">(</span><span class="identifier-syntax">action_pattern</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> *</span><span class="identifier-syntax">cpm</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">needed</span><span class="plain-syntax">[</span><span class="constant-syntax">MAX_CPM_CLAUSES</span><span class="plain-syntax">],</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ap_clause</span><span class="plain-syntax"> *</span><span class="identifier-syntax">needed_apoc</span><span class="plain-syntax">[</span><span class="constant-syntax">MAX_CPM_CLAUSES</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">cpm_count</span><span class="plain-syntax"> = *</span><span class="identifier-syntax">cpm</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">GoingPlugin::going_nowhere</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CPMC_NEEDED</span><span class="plain-syntax">(</span><span class="constant-syntax">NOWHERE_CPMC</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</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">GoingPlugin::going_somewhere</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CPMC_NEEDED</span><span class="plain-syntax">(</span><span class="constant-syntax">SOMEWHERE_CPMC</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</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">GoingPlugin::need_to_check_destination_exists</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CPMC_NEEDED</span><span class="plain-syntax">(</span><span class="constant-syntax">NOT_NOWHERE_CPMC</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> *</span><span class="identifier-syntax">cpm</span><span class="plain-syntax"> = </span><span class="identifier-syntax">cpm_count</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">FALSE</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">RTGoing::compile_pattern_match_clause</span><span class="plain-syntax">(</span><span class="identifier-syntax">value_holster</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">action_pattern</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">cpmc</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">cpmc</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">NOWHERE_CPMC:</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP10" class="function-link"><span class="function-syntax">EmitCode::inv</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">EQ_BIP</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP10" class="function-link"><span class="function-syntax">EmitCode::inv</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">LOOKUP_BIP</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP7" class="function-link"><span class="function-syntax">EmitCode::val_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">MSTACK_HL</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP10" class="function-link"><span class="function-syntax">EmitCode::call</span></a><span class="plain-syntax">(</span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">MSTVON_HL</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP7" class="function-link"><span class="function-syntax">EmitCode::val_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><span class="identifier-syntax">GoingPlugin::id</span><span class="plain-syntax">());</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP7" class="function-link"><span class="function-syntax">EmitCode::val_number</span></a><span class="plain-syntax">(1);</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP7" class="function-link"><span class="function-syntax">EmitCode::val_number</span></a><span class="plain-syntax">(0);</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><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">TRUE</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">SOMEWHERE_CPMC:</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">somewhere</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Specifications::from_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">K_room</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="7-ap.html#SP4" class="function-link"><span class="function-syntax">RTActionPatterns::compile_pattern_match_clause</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">VH</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><a href="5-tv.html#SP3" class="function-link"><span class="function-syntax">RTTemporaryVariables::from_nve</span></a><span class="plain-syntax">(</span><a href="5-vrb.html#SP1" class="function-link"><span class="function-syntax">RTVariables::nve_from_named_mstack</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">GoingPlugin::id</span><span class="plain-syntax">(), </span><span class="constant-syntax">1</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">K_object</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">somewhere</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_object</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">return</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">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">NOT_NOWHERE_CPMC:</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP10" class="function-link"><span class="function-syntax">EmitCode::inv</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">NE_BIP</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP10" class="function-link"><span class="function-syntax">EmitCode::inv</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">LOOKUP_BIP</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP7" class="function-link"><span class="function-syntax">EmitCode::val_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">MSTACK_HL</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP10" class="function-link"><span class="function-syntax">EmitCode::call</span></a><span class="plain-syntax">(</span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">MSTVON_HL</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP7" class="function-link"><span class="function-syntax">EmitCode::val_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><span class="identifier-syntax">GoingPlugin::id</span><span class="plain-syntax">());</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP7" class="function-link"><span class="function-syntax">EmitCode::val_number</span></a><span class="plain-syntax">(1);</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP7" class="function-link"><span class="function-syntax">EmitCode::val_number</span></a><span class="plain-syntax">(0);</span>
<span class="plain-syntax"> </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><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">TRUE</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><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
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