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Graham Nelson fa5240ab3b Refactored property value compilation
2021-05-23 23:12:40 +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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<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#4">Chapter 4: Enclosed Resources</a></li><li><b>Stored Action Literals</b></li></ul></div>
<p class="purpose">Explicit actions stored in memory as literals.</p>
<ul class="toc"><li><a href="4-sal.html#SP1">&#167;1. Runtime representation</a></li></ul><hr class="tocbar">
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. Runtime representation. </b>Literal stored actions arise from source text such as:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="identifier-syntax">let</span><span class="plain-syntax"> </span><span class="identifier-syntax">Q</span><span class="plain-syntax"> </span><span class="identifier-syntax">be</span><span class="plain-syntax"> </span><span class="identifier-syntax">examining</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="identifier-syntax">harmonium</span><span class="plain-syntax">;</span>
</pre>
<p class="commentary">This is called only from the actions plugin; in Basic Inform no stored actions
exist, so if the function is called then an internal error will be thrown.
</p>
<p class="commentary">Stored actions are stored in small blocks, always of size 6. There are no
long blocks.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> small block:</span>
<span class="plain-syntax"> Q ----------------&gt; action name</span>
<span class="plain-syntax"> first noun</span>
<span class="plain-syntax"> second noun</span>
<span class="plain-syntax"> actor</span>
<span class="plain-syntax"> request</span>
<span class="plain-syntax"> command text</span>
</pre>
<p class="commentary">See <a href="../WorldModelKit/S-str.html" class="internal">StoredAction (in WorldModelKit)</a> for more. Note that literals do not arise
from typed commands, so they have no command text, and the final word is
therefore always 0 for literal actions.
</p>
<p class="commentary">The default is "waiting":
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="function-syntax">StoredActionLiterals::default</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">StoredActionLiterals::default</span></span>:<br/>Default Values - <a href="2-dv.html#SP2_2">&#167;2.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">small_block</span><span class="plain-syntax"> = </span><a href="4-enc.html#SP2" class="function-link"><span class="function-syntax">Enclosures::new_small_block_for_constant</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">packaging_state</span><span class="plain-syntax"> </span><span class="identifier-syntax">save</span><span class="plain-syntax"> = </span><a href="2-ea.html#SP2" class="function-link"><span class="function-syntax">EmitArrays::begin_late</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">small_block</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_value</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-th.html#SP6" class="function-link"><span class="function-syntax">TheHeap::emit_block_value_header</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_stored_action</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><span class="constant-syntax">6</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-ea.html#SP4" class="function-link"><span class="function-syntax">EmitArrays::iname_entry</span></a><span class="plain-syntax">(</span><a href="5-act2.html#SP6" class="function-link"><span class="function-syntax">RTActions::double_sharp</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ActionsPlugin::default_action_name</span><span class="plain-syntax">()));</span>
<span class="plain-syntax"> </span><a href="2-ea.html#SP4" class="function-link"><span class="function-syntax">EmitArrays::numeric_entry</span></a><span class="plain-syntax">(0);</span>
<span class="plain-syntax"> </span><a href="2-ea.html#SP4" class="function-link"><span class="function-syntax">EmitArrays::numeric_entry</span></a><span class="plain-syntax">(0);</span>
<span class="plain-syntax"> </span><a href="2-ea.html#SP4" class="function-link"><span class="function-syntax">EmitArrays::iname_entry</span></a><span class="plain-syntax">(</span><a href="5-ins.html#SP1" class="function-link"><span class="function-syntax">RTInstances::value_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I_yourself</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><a href="2-ea.html#SP4" class="function-link"><span class="function-syntax">EmitArrays::numeric_entry</span></a><span class="plain-syntax">(0);</span>
<span class="plain-syntax"> </span><a href="2-ea.html#SP4" class="function-link"><span class="function-syntax">EmitArrays::numeric_entry</span></a><span class="plain-syntax">(0);</span>
<span class="plain-syntax"> </span><a href="2-ea.html#SP6" class="function-link"><span class="function-syntax">EmitArrays::end</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">save</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">small_block</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="function-syntax">StoredActionLiterals::small_block</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">StoredActionLiterals::small_block</span></span>:<br/>Action Patterns - <a href="7-ap.html#SP5">&#167;5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">explicit_action</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ea</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">K_stored_action</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 stored action kind exists"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">small_block</span><span class="plain-syntax"> = </span><a href="4-enc.html#SP2" class="function-link"><span class="function-syntax">Enclosures::new_small_block_for_constant</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">packaging_state</span><span class="plain-syntax"> </span><span class="identifier-syntax">save</span><span class="plain-syntax"> = </span><a href="2-ea.html#SP2" class="function-link"><span class="function-syntax">EmitArrays::begin_late</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">small_block</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_value</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-th.html#SP6" class="function-link"><span class="function-syntax">TheHeap::emit_block_value_header</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_stored_action</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><span class="constant-syntax">6</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">action_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">an</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ea</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">action</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><a href="2-ea.html#SP4" class="function-link"><span class="function-syntax">EmitArrays::iname_entry</span></a><span class="plain-syntax">(</span><a href="5-act2.html#SP6" class="function-link"><span class="function-syntax">RTActions::double_sharp</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">an</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">request_bits</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">ea</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">request</span><span class="plain-syntax">)?1:0;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ea</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">first_noun</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">K_understanding</span><span class="plain-syntax">) &amp;&amp;</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">Rvalues::is_CONSTANT_of_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">ea</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">first_noun</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_understanding</span><span class="plain-syntax">))) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">request_bits</span><span class="plain-syntax"> = </span><span class="identifier-syntax">request_bits</span><span class="plain-syntax"> | </span><span class="constant-syntax">16</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">BC</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iname</span><span class="plain-syntax"> = </span><a href="4-tl.html#SP4" class="function-link"><span class="function-syntax">TextLiterals::to_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">ea</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">first_noun</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><a href="2-ea.html#SP4" class="function-link"><span class="function-syntax">EmitArrays::iname_entry</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</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">BC</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">CompileValues::to_array_entry</span><span class="plain-syntax">(</span><span class="identifier-syntax">ea</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">first_noun</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-ea.html#SP4" class="function-link"><span class="function-syntax">EmitArrays::numeric_entry</span></a><span class="plain-syntax">(0);</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">ea</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">second_noun</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">K_understanding</span><span class="plain-syntax">) &amp;&amp;</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">Rvalues::is_CONSTANT_of_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">ea</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">second_noun</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_understanding</span><span class="plain-syntax">))) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">request_bits</span><span class="plain-syntax"> = </span><span class="identifier-syntax">request_bits</span><span class="plain-syntax"> | </span><span class="constant-syntax">32</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iname</span><span class="plain-syntax"> = </span><a href="4-tl.html#SP4" class="function-link"><span class="function-syntax">TextLiterals::to_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">ea</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">second_noun</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><a href="2-ea.html#SP4" class="function-link"><span class="function-syntax">EmitArrays::iname_entry</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">CompileValues::to_array_entry</span><span class="plain-syntax">(</span><span class="identifier-syntax">ea</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">second_noun</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-ea.html#SP4" class="function-link"><span class="function-syntax">EmitArrays::numeric_entry</span></a><span class="plain-syntax">(0);</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">ea</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">actor</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CompileValues::to_array_entry</span><span class="plain-syntax">(</span><span class="identifier-syntax">ea</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">actor</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-ea.html#SP4" class="function-link"><span class="function-syntax">EmitArrays::iname_entry</span></a><span class="plain-syntax">(</span><a href="5-ins.html#SP1" class="function-link"><span class="function-syntax">RTInstances::value_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I_yourself</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><a href="2-ea.html#SP4" class="function-link"><span class="function-syntax">EmitArrays::numeric_entry</span></a><span class="plain-syntax">((</span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax">) </span><span class="identifier-syntax">request_bits</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-ea.html#SP4" class="function-link"><span class="function-syntax">EmitArrays::numeric_entry</span></a><span class="plain-syntax">(0);</span>
<span class="plain-syntax"> </span><a href="2-ea.html#SP6" class="function-link"><span class="function-syntax">EmitArrays::end</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">save</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">small_block</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
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