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<!--Weave of 'Variables' 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">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>Variables</b></li></ul></div>
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<p class="purpose">To compile run-time support for nonlocal variables.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b></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">RTVariables::emit_all</span><span class="plain-syntax">(</span><span class="identifier-syntax">inference_subject_family</span><span class="plain-syntax"> *</span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">ignored</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">nonlocal_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">, </span><span class="identifier-syntax">nonlocal_variable</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">nlv</span><span class="plain-syntax">-></span><span class="identifier-syntax">constant_at_run_time</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">nlv</span><span class="plain-syntax">-></span><span class="identifier-syntax">housed_in_variables_array</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">BEGIN_COMPILATION_MODE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">COMPILATION_MODE_EXIT</span><span class="plain-syntax">(</span><span class="identifier-syntax">DEREFERENCE_POINTERS_CMODE</span><span class="plain-syntax">);</span>
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<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><span class="identifier-syntax">NonlocalVariables::iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">v1</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">v2</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">NonlocalVariables::seek_initial_value</span><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">, &</span><span class="identifier-syntax">v1</span><span class="plain-syntax">, &</span><span class="identifier-syntax">v2</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">END_COMPILATION_MODE</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">rvalue</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="identifier-syntax">housed_in_variables_array</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">rvalue</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NonlocalVariables::identifier</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-emt.html#SP3" class="function-link"><span class="function-syntax">Emit::variable</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">, </span><span class="identifier-syntax">nlv</span><span class="plain-syntax">-></span><span class="identifier-syntax">nlv_kind</span><span class="plain-syntax">, </span><span class="identifier-syntax">v1</span><span class="plain-syntax">, </span><span class="identifier-syntax">v2</span><span class="plain-syntax">, </span><span class="identifier-syntax">rvalue</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-vrb.html#SP1_1" class="named-paragraph-link"><span class="named-paragraph">Add any anomalous extras</span><span class="named-paragraph-number">1.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<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>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP1_1" class="paragraph-anchor"></a><b>§1.1. </b>Here, an inter routine is compiled which returns the current value of the
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command prompt variable; see <a href="../CommandParserKit/S-prs.html" class="internal">Parser (in CommandParserKit)</a>.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Add any anomalous extras</span><span class="named-paragraph-number">1.1</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">nlv</span><span class="plain-syntax"> == </span><span class="identifier-syntax">command_prompt_VAR</span><span class="plain-syntax">) {</span>
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<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><span class="identifier-syntax">NonlocalVariables::iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">nlv</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">cpt_iname</span><span class="plain-syntax"> = </span><a href="2-hrr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="constant-syntax">COMMANDPROMPTTEXT_HL</span><span class="plain-syntax">);</span>
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<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="4-rtn.html#SP1" class="function-link"><span class="function-syntax">Routines::begin</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">cpt_iname</span><span class="plain-syntax">);</span>
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<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">RETURN_BIP</span><span class="plain-syntax">);</span>
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<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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::val_iname</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_text</span><span class="plain-syntax">, </span><span class="identifier-syntax">iname</span><span class="plain-syntax">);</span>
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<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>
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<span class="plain-syntax"> </span><a href="4-rtn.html#SP4" class="function-link"><span class="function-syntax">Routines::end</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">save</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-hrr.html#SP4" class="function-link"><span class="function-syntax">Hierarchy::make_available</span></a><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">cpt_iname</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="4-vrb.html#SP1">§1</a>.</li></ul>
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