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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: Compilation Utilities</a></li><li><b>Conditions</b></li></ul></div>
<p class="purpose">Compiling conditions is mostly a matter of getting callings right.</p>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>We need to keep track of the callings made in any condition so that the
variables, which generally have a scope extending beyond that condition,
can't be left with kind-unsafe (or no) values. For example, if:
</p>
<blockquote>
<p>if a device (called the mechanism) is switched on: ...</p>
</blockquote>
<p class="commentary">turns out false, then "mechanism" has to be safely defused to some kind-safe
value.
</p>
<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">MAX_CALLINGS_IN_MATCH</span><span class="plain-syntax"> </span><span class="constant-syntax">128</span>
</pre>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">current_session_number</span><span class="plain-syntax"> = -1;</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">callings_in_condition_sp</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">callings_session_number</span><span class="plain-syntax">[</span><span class="constant-syntax">MAX_CALLINGS_IN_MATCH</span><span class="plain-syntax">];</span>
<span class="identifier-syntax">local_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">callings_in_condition</span><span class="plain-syntax">[</span><span class="constant-syntax">MAX_CALLINGS_IN_MATCH</span><span class="plain-syntax">];</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RTConditions::add_calling_to_condition</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">RTConditions::add_calling_to_condition</span></span>:<br/>Action Patterns - <a href="5-ap.html#SP4">&#167;4</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">local_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">lvar</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">current_session_number</span><span class="plain-syntax"> &lt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no PM session"</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">callings_in_condition_sp</span><span class="plain-syntax"> + </span><span class="constant-syntax">1</span><span class="plain-syntax"> == </span><span class="constant-syntax">MAX_CALLINGS_IN_MATCH</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">BelievedImpossible</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="string-syntax">"that makes too complicated a condition to test"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"with all of those clauses involving 'called' values."</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="identifier-syntax">callings_session_number</span><span class="plain-syntax">[</span><span class="identifier-syntax">callings_in_condition_sp</span><span class="plain-syntax">] = </span><span class="identifier-syntax">current_session_number</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">callings_in_condition</span><span class="plain-syntax">[</span><span class="identifier-syntax">callings_in_condition_sp</span><span class="plain-syntax">++] = </span><span class="identifier-syntax">lvar</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RTConditions::begin_condition_emit</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">RTConditions::begin_condition_emit</span></span>:<br/>Looping Over Scope - <a href="5-los.html#SP2_1">&#167;2.1</a><br/>Action Patterns - <a href="5-ap.html#SP6_1">&#167;6.1</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">current_session_number</span><span class="plain-syntax">++;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::inv_primitive</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">OR_BIP</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::down</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">());</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">RTConditions::end_condition_emit</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">RTConditions::end_condition_emit</span></span>:<br/>Looping Over Scope - <a href="5-los.html#SP2_1">&#167;2.1</a><br/>Action Patterns - <a href="5-ap.html#SP6_1">&#167;6.1</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">current_session_number</span><span class="plain-syntax"> &lt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"unstarted PM session"</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">NC</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">x</span><span class="plain-syntax"> = </span><span class="identifier-syntax">callings_in_condition_sp</span><span class="plain-syntax">, </span><span class="identifier-syntax">downs</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">while</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">x</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) &amp;&amp;</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">callings_session_number</span><span class="plain-syntax">[</span><span class="identifier-syntax">x</span><span class="plain-syntax">-1] == </span><span class="identifier-syntax">current_session_number</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">NC</span><span class="plain-syntax">++;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">x</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">NC</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">Produce::val</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">K_truth_state</span><span class="plain-syntax">, </span><span class="identifier-syntax">LITERAL_IVAL</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="identifier-syntax">Produce::inv_primitive</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">SEQUENTIAL_BIP</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::down</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">()); </span><span class="identifier-syntax">downs</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">NM</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">inner_downs</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">while</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">callings_in_condition_sp</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) &amp;&amp;</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">callings_session_number</span><span class="plain-syntax">[</span><span class="identifier-syntax">callings_in_condition_sp</span><span class="plain-syntax">-1] == </span><span class="identifier-syntax">current_session_number</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">NM</span><span class="plain-syntax">++;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">local_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">lvar</span><span class="plain-syntax"> = </span><span class="identifier-syntax">callings_in_condition</span><span class="plain-syntax">[</span><span class="identifier-syntax">callings_in_condition_sp</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">NM</span><span class="plain-syntax"> &lt; </span><span class="identifier-syntax">NC</span><span class="plain-syntax">) { </span><span class="identifier-syntax">Produce::inv_primitive</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">SEQUENTIAL_BIP</span><span class="plain-syntax">); </span><span class="identifier-syntax">Produce::down</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">()); </span><span class="identifier-syntax">inner_downs</span><span class="plain-syntax">++; }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::inv_primitive</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">STORE_BIP</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::down</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><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">lvar_s</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LocalVariables::declare</span><span class="plain-syntax">(</span><span class="identifier-syntax">lvar</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::ref_symbol</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><span class="identifier-syntax">lvar_s</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LocalVariables::kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">lvar</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</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) ||</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::Behaviour::is_object</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">)) ||</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::Behaviour::definite</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) ||</span>
<span class="plain-syntax"> (</span><a href="4-rsfk.html#SP5" class="function-link"><span class="function-syntax">RTKinds::emit_default_value_as_val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">, </span><span class="identifier-syntax">EMPTY_WORDING</span><span class="plain-syntax">, </span><span class="string-syntax">"'called' value"</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">Produce::val</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">K_truth_state</span><span class="plain-syntax">, </span><span class="identifier-syntax">LITERAL_IVAL</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">Produce::up</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">());</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">callings_in_condition_sp</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><span class="identifier-syntax">inner_downs</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) { </span><span class="identifier-syntax">inner_downs</span><span class="plain-syntax">--; </span><span class="identifier-syntax">Produce::up</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">()); }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::val</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">K_truth_state</span><span class="plain-syntax">, </span><span class="identifier-syntax">LITERAL_IVAL</span><span class="plain-syntax">, </span><span class="constant-syntax">0</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">current_session_number</span><span class="plain-syntax">--;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">downs</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) { </span><span class="identifier-syntax">downs</span><span class="plain-syntax">--; </span><span class="identifier-syntax">Produce::up</span><span class="plain-syntax">(</span><a href="2-emt.html#SP2" class="function-link"><span class="function-syntax">Emit::tree</span></a><span class="plain-syntax">()); }</span>
<span class="plain-syntax">}</span>
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