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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">imperative</a></li><li><a href="index.html#2">Chapter 2: Functions</a></li><li><b>Compile Imperative Definitions</b></li></ul></div>
<p class="purpose">Compiling an Inter function from the body of an imperative definition.</p>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>This is a short section, but the function <a href="2-cid.html#SP1" class="internal">CompileImperativeDefn::go</a> sits
at the top of a mountain of code occupying most of the rest of this module.
</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">CompileImperativeDefn::go</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">CompileImperativeDefn::go</span></span>:<br/>Phrase Requests - <a href="2-pr.html#SP4">&#167;4</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">id_body</span><span class="plain-syntax"> *</span><span class="identifier-syntax">idb</span><span class="plain-syntax">, </span><span class="identifier-syntax">shared_variable_access_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">legible</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">to_phrase_request</span><span class="plain-syntax"> *</span><span class="identifier-syntax">req</span><span class="plain-syntax">, </span><span class="identifier-syntax">rule</span><span class="plain-syntax"> *</span><span class="identifier-syntax">R</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">code_at</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ImperativeDefinitions::body_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">idb</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">Node::is</span><span class="plain-syntax">(</span><span class="identifier-syntax">code_at</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">next</span><span class="plain-syntax">, </span><span class="identifier-syntax">DEFN_CONT_NT</span><span class="plain-syntax">)) </span><span class="identifier-syntax">code_at</span><span class="plain-syntax"> = </span><span class="identifier-syntax">code_at</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">next</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">PHRASE_COMPILATION</span><span class="plain-syntax">, </span><span class="string-syntax">"Compiling phrase:\n$T"</span><span class="plain-syntax">, </span><span class="identifier-syntax">code_at</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">code_at</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CompilationUnits::set_current</span><span class="plain-syntax">(</span><span class="identifier-syntax">code_at</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">stack_frame</span><span class="plain-syntax"> *</span><span class="identifier-syntax">frame</span><span class="plain-syntax"> = &amp;(</span><span class="identifier-syntax">idb</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">compilation_data</span><span class="plain-syntax">.</span><span class="identifier-syntax">id_stack_frame</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><span class="identifier-syntax">req</span><span class="plain-syntax">?(</span><span class="identifier-syntax">req</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">req_iname</span><span class="plain-syntax">):(</span><span class="identifier-syntax">IDCompilation::iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">idb</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-cid.html#SP1_2" class="named-paragraph-link"><span class="named-paragraph">Set up the stack frame for this compilation request</span><span class="named-paragraph-number">1.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-cid.html#SP1_1" class="named-paragraph-link"><span class="named-paragraph">Compile some commentary about the function to follow</span><span class="named-paragraph-number">1.1</span></a></span><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-fnc.html#SP5" class="function-link"><span class="function-syntax">Functions::begin_from_idb</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">iname</span><span class="plain-syntax">, </span><span class="identifier-syntax">frame</span><span class="plain-syntax">, </span><span class="identifier-syntax">idb</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-cid.html#SP1_3" class="named-paragraph-link"><span class="named-paragraph">Compile the body of the routine</span><span class="named-paragraph-number">1.3</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><a href="2-fnc.html#SP6" class="function-link"><span class="function-syntax">Functions::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="identifier-syntax">current_sentence</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">CompilationUnits::set_current</span><span class="plain-syntax">(</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP1_1" class="paragraph-anchor"></a><b>&#167;1.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Compile some commentary about the function to follow</span><span class="named-paragraph-number">1.1</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">req</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">Produce::comment</span><span class="plain-syntax">(</span><span class="identifier-syntax">Emit::tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">I</span><span class="string-syntax">"No specific request"</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">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="string-syntax">"Request %d: "</span><span class="plain-syntax">, </span><span class="identifier-syntax">req</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">allocation_id</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Kinds::Textual::write</span><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><a href="2-pr.html#SP3" class="function-link"><span class="function-syntax">PhraseRequests::kind_of_request</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">req</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::comment</span><span class="plain-syntax">(</span><span class="identifier-syntax">Emit::tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">C</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">C</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ImperativeDefinitions::write_comment_describing</span><span class="plain-syntax">(</span><span class="identifier-syntax">idb</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">head_of_defn</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-cid.html#SP1">&#167;1</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_2" class="paragraph-anchor"></a><b>&#167;1.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Set up the stack frame for this compilation request</span><span class="named-paragraph-number">1.2</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="identifier-syntax">id_type_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">idtd</span><span class="plain-syntax"> = &amp;(</span><span class="identifier-syntax">idb</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">type_data</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">version_kind</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">req</span><span class="plain-syntax">) </span><span class="identifier-syntax">version_kind</span><span class="plain-syntax"> = </span><a href="2-pr.html#SP3" class="function-link"><span class="function-syntax">PhraseRequests::kind_of_request</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">req</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">version_kind</span><span class="plain-syntax"> = </span><span class="identifier-syntax">IDTypeData::kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">idtd</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">IDCompilation::initialise_stack_frame_from_type_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">frame</span><span class="plain-syntax">, </span><span class="identifier-syntax">idtd</span><span class="plain-syntax">, </span><span class="identifier-syntax">version_kind</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">req</span><span class="plain-syntax">) </span><a href="2-sf.html#SP8" class="function-link"><span class="function-syntax">Frames::set_kind_variables</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">frame</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><a href="2-pr.html#SP3" class="function-link"><span class="function-syntax">PhraseRequests::kind_variables_for_request</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">req</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-sf.html#SP8" class="function-link"><span class="function-syntax">Frames::set_kind_variables</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">frame</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-sf.html#SP10" class="function-link"><span class="function-syntax">Frames::set_shared_variable_access_list</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">frame</span><span class="plain-syntax">, </span><span class="identifier-syntax">legible</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-lvs.html#SP14" class="function-link"><span class="function-syntax">LocalVariableSlates::deallocate_all</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">frame</span><span class="plain-syntax">); </span><span class="comment-syntax"> in case any are left from an earlier compile</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">PreformCache::warn_of_changes</span><span class="plain-syntax">(); </span><span class="comment-syntax"> that local variables may have changed</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-cid.html#SP1">&#167;1</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_3" class="paragraph-anchor"></a><b>&#167;1.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Compile the body of the routine</span><span class="named-paragraph-number">1.3</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">code_at</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">RTRules::compile_test_head</span><span class="plain-syntax">(</span><span class="identifier-syntax">idb</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">code_at</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">VerifyTree::verify_structure_from</span><span class="plain-syntax">(</span><span class="identifier-syntax">code_at</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="4-cbal.html#SP1" class="function-link"><span class="function-syntax">CompileBlocksAndLines::full_definition_body</span></a><span class="plain-syntax">(1, </span><span class="identifier-syntax">code_at</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">down</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">VerifyTree::verify_structure_from</span><span class="plain-syntax">(</span><span class="identifier-syntax">code_at</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax"> = </span><span class="identifier-syntax">code_at</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">RTRules::compile_test_tail</span><span class="plain-syntax">(</span><span class="identifier-syntax">idb</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-cid.html#SP1_3_1" class="named-paragraph-link"><span class="named-paragraph">Compile a terminal return statement</span><span class="named-paragraph-number">1.3.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-cid.html#SP1">&#167;1</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP1_3_1" class="paragraph-anchor"></a><b>&#167;1.3.1. </b>In Inter, all functions must return a value: in Inform 7, some phrases do not.
If we are compiling a function to perform such a phrase, we have it return 0.
This value will almost certainly be thrown away, but it seems clearest to make
it 0 in all cases.
</p>
<p class="commentary">Otherwise, if execution reaches the end of our function, we return the default
value for its return kind: for example, the empty text for <span class="extract"><span class="extract-syntax">K_text</span></span>.
</p>
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Compile a terminal return statement</span><span class="named-paragraph-number">1.3.1</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::inv_primitive</span><span class="plain-syntax">(</span><span class="identifier-syntax">Emit::tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">RETURN_BIP</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::down</span><span class="plain-syntax">(</span><span class="identifier-syntax">Emit::tree</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><a href="2-sf.html#SP7" class="function-link"><span class="function-syntax">Frames::get_kind_returned</span></a><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="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">RTKinds::emit_default_value_as_val</span><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="plain-syntax"> </span><span class="string-syntax">"value decided by this phrase"</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">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_DefaultDecideFails</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="string-syntax">"it's not possible to decide such a value"</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="string-syntax">"so this can't be allowed."</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::val</span><span class="plain-syntax">(</span><span class="identifier-syntax">Emit::tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">K_number</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="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::val</span><span class="plain-syntax">(</span><span class="identifier-syntax">Emit::tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">K_number</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="comment-syntax"> that is, "false"</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::up</span><span class="plain-syntax">(</span><span class="identifier-syntax">Emit::tree</span><span class="plain-syntax">());</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="2-cid.html#SP1_3">&#167;1.3</a>.</li></ul>
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