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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../inform7n.html">Inform7</a></li><li><a href="index.html">imperative</a></li><li><a href="index.html#3">Chapter 3: 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>
<ul class="toc"><li><a href="3-cid.html#SP1">&#167;1. Compilation</a></li><li><a href="3-cid.html#SP3">&#167;3. Data about compilation</a></li><li><a href="3-cid.html#SP9">&#167;9. Preparing the stack frame</a></li></ul><hr class="tocbar">
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. Compilation. </b>This is a short section, but the function <a href="3-cid.html#SP2" class="internal">CompileImperativeDefn::go</a> sits
at the top of a mountain of code occupying most of the rest of this module.
That's a function called either from <a href="3-pr.html" class="internal">Phrase Requests</a> or from here:
</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::not_from_phrase</span><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="reserved-syntax">int</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">max_i</span><span class="plain-syntax">,</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="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="reserved-syntax">if</span><span class="plain-syntax"> (</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="element-syntax">at_least_one_compiled_form_needed</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="3-cid.html#SP2" class="function-link"><span class="function-syntax">CompileImperativeDefn::go</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">idb</span><span class="plain-syntax">, </span><span class="identifier-syntax">legible</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="identifier-syntax">R</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="3-cid.html#SP1" class="function-link"><span class="function-syntax">CompileImperativeDefn::advance_progress_bar</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">idb</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="identifier-syntax">max_i</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </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="element-syntax">at_least_one_compiled_form_needed</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</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">CompileImperativeDefn::advance_progress_bar</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::advance_progress_bar</span></span>:<br/>Phrase Requests - <a href="3-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="reserved-syntax">int</span><span class="plain-syntax"> *</span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">max_i</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">idb</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">compilation_data</span><span class="plain-syntax">.</span><span class="element-syntax">at_least_one_compiled_form_needed</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> (*</span><span class="identifier-syntax">i</span><span class="plain-syntax">)++;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ProgressBar::update</span><span class="plain-syntax">(4, ((</span><span class="reserved-syntax">float</span><span class="plain-syntax">) (*</span><span class="identifier-syntax">i</span><span class="plain-syntax">))/((</span><span class="reserved-syntax">float</span><span class="plain-syntax">) </span><span class="identifier-syntax">max_i</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>Either way, all compilations of non-inline imperative bodies come through here:
</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('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">CompileImperativeDefn::go</span></span>:<br/><a href="3-cid.html#SP1">&#167;1</a><br/>Phrase Requests - <a href="3-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="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="element-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><a href="3-cid.html#SP5" class="function-link"><span class="function-syntax">CompileImperativeDefn::iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">idb</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">md_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">md_iname</span><span class="plain-syntax">):</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-cid.html#SP2_2" class="named-paragraph-link"><span class="named-paragraph">Set up the stack frame for this compilation request</span><span class="named-paragraph-number">2.2</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="3-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="3-cid.html#SP2_1" class="named-paragraph-link"><span class="named-paragraph">Compile some commentary about the function to follow</span><span class="named-paragraph-number">2.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-cid.html#SP2_3" class="named-paragraph-link"><span class="named-paragraph">Compile the body of the function</span><span class="named-paragraph-number">2.3</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><a href="3-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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">md_iname</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">syn</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">syn</span><span class="plain-syntax">, </span><span class="string-syntax">"%W"</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">-&gt;</span><span class="identifier-syntax">log_text</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Emit::text_constant</span><span class="plain-syntax">(</span><span class="identifier-syntax">md_iname</span><span class="plain-syntax">, </span><span class="identifier-syntax">syn</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">syn</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">NULL</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2_1" class="paragraph-anchor"></a><b>&#167;2.1. </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">2.1</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">EmitCode::comment</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="3-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">EmitCode::comment</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="3-cid.html#SP2">&#167;2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP2_2" class="paragraph-anchor"></a><b>&#167;2.2. </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">2.2</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="3-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><a href="3-cid.html#SP10" class="function-link"><span class="function-syntax">CompileImperativeDefn::set_up_stack_frame_for_compilation</span></a><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="3-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="3-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="3-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="3-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="3-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="3-cid.html#SP2">&#167;2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP2_3" class="paragraph-anchor"></a><b>&#167;2.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Compile the body of the function</span><span class="named-paragraph-number">2.3</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="5-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="3-cid.html#SP2_3_1" class="named-paragraph-link"><span class="named-paragraph">Compile a terminal return statement</span><span class="named-paragraph-number">2.3.1</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="3-cid.html#SP2">&#167;2</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP2_3_1" class="paragraph-anchor"></a><b>&#167;2.3.1. </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">2.3.1</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">EmitCode::inv</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">EmitCode::down</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="3-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">DefaultValues::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">EmitCode::val_number</span><span class="plain-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">EmitCode::val_number</span><span class="plain-syntax">(0); </span><span class="comment-syntax"> that is, "false"</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">EmitCode::up</span><span class="plain-syntax">();</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="3-cid.html#SP2_3">&#167;2.3</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. Data about compilation. </b>Each imperative definition body has the following data attached to it.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">id_compilation_data</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">stack_frame</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="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">at_least_one_compiled_form_needed</span><span class="plain-syntax">; </span><span class="comment-syntax"> do we still need to compile this?</span>
<span class="plain-syntax"> </span><span class="comment-syntax"> for inline definitions only:</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">inline_mor</span><span class="plain-syntax">; </span><span class="comment-syntax"> inline manner of return</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">inline_wn</span><span class="plain-syntax">; </span><span class="comment-syntax"> word number of inline definition, or </span><span class="extract"><span class="extract-syntax">-1</span></span><span class="comment-syntax"> if not inline</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inline_front_schema</span><span class="plain-syntax">; </span><span class="comment-syntax"> inline definition translated to inter, if possible</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inline_back_schema</span><span class="plain-syntax">; </span><span class="comment-syntax"> inline definition translated to inter, if possible</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_defn_converted</span><span class="plain-syntax">; </span><span class="comment-syntax"> has this been tried yet?</span>
<span class="plain-syntax"> </span><span class="comment-syntax"> for non-inline definitions only:</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">package_request</span><span class="plain-syntax"> *</span><span class="identifier-syntax">requests_package</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">label_namespaces</span><span class="plain-syntax">; </span><span class="comment-syntax"> of </span><span class="extract"><span class="extract-syntax">label_namespace</span></span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">compile_with_run_time_debugging</span><span class="plain-syntax">; </span><span class="comment-syntax"> in the RULES command</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ph_iname</span><span class="plain-syntax">; </span><span class="comment-syntax"> or NULL for inline phrases</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">id_compilation_data</span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>The structure id_compilation_data is accessed in 3/fnc, 3/jl, 3/pr, 5/cii and here.</li></ul>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">id_compilation_data</span><span class="plain-syntax"> </span><span class="function-syntax">CompileImperativeDefn::new_data</span><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">p</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">id_compilation_data</span><span class="plain-syntax"> </span><span class="identifier-syntax">phcd</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">phcd</span><span class="plain-syntax">.</span><span class="element-syntax">id_stack_frame</span><span class="plain-syntax"> = </span><a href="3-sf.html#SP6" class="function-link"><span class="function-syntax">Frames::new</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">phcd</span><span class="plain-syntax">.</span><span class="element-syntax">at_least_one_compiled_form_needed</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">phcd</span><span class="plain-syntax">.</span><span class="element-syntax">inline_wn</span><span class="plain-syntax"> = -1;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">phcd</span><span class="plain-syntax">.</span><span class="element-syntax">inline_front_schema</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">phcd</span><span class="plain-syntax">.</span><span class="element-syntax">inline_back_schema</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">phcd</span><span class="plain-syntax">.</span><span class="element-syntax">inter_defn_converted</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">phcd</span><span class="plain-syntax">.</span><span class="element-syntax">inline_mor</span><span class="plain-syntax"> = </span><span class="identifier-syntax">DONT_KNOW_MOR</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">phcd</span><span class="plain-syntax">.</span><span class="element-syntax">ph_iname</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">phcd</span><span class="plain-syntax">.</span><span class="element-syntax">label_namespaces</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NEW_LINKED_LIST</span><span class="plain-syntax">(</span><span class="reserved-syntax">label_namespace</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">phcd</span><span class="plain-syntax">.</span><span class="element-syntax">requests_package</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">phcd</span><span class="plain-syntax">.</span><span class="element-syntax">compile_with_run_time_debugging</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">phcd</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. </b>An iname can, for convenience, be attached. For "To..." phrases, no iname
is attached; it will be different in each different instantiation of the
definition. But for rules and adjective definitions, this is useful:
</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::set_iname</span><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">inter_name</span><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">idb</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">compilation_data</span><span class="plain-syntax">.</span><span class="element-syntax">ph_iname</span><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">inter_name</span><span class="plain-syntax"> *</span><span class="function-syntax">CompileImperativeDefn::iname</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">CompileImperativeDefn::iname</span></span>:<br/><a href="3-cid.html#SP2">&#167;2</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="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </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">ph_iname</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>&#167;6. </b>Definition bodies with an inline definition use these functions, and are
never run through <a href="3-cid.html#SP2" class="internal">CompileImperativeDefn::go</a> at all:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CompileImperativeDefn::is_inline</span><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="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</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="element-syntax">inline_wn</span><span class="plain-syntax"> &lt; </span><span class="constant-syntax">0</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">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">void</span><span class="plain-syntax"> </span><span class="function-syntax">CompileImperativeDefn::make_inline</span><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="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">inline_wn</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">mor</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </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="element-syntax">inline_wn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">inline_wn</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </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="element-syntax">inline_mor</span><span class="plain-syntax"> = </span><span class="identifier-syntax">mor</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </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="element-syntax">at_least_one_compiled_form_needed</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="function-syntax">CompileImperativeDefn::get_inline_definition</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">CompileImperativeDefn::get_inline_definition</span></span>:<br/><a href="3-cid.html#SP6_1">&#167;6.1</a><br/>Phrase Requests - <a href="3-pr.html#SP1_1_1">&#167;1.1.1</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="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</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="element-syntax">inline_wn</span><span class="plain-syntax"> &lt; </span><span class="constant-syntax">0</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"tried to access inline definition of non-inline phrase"</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">Lexer::word_text</span><span class="plain-syntax">(</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="element-syntax">inline_wn</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">inter_schema</span><span class="plain-syntax"> *</span><span class="function-syntax">CompileImperativeDefn::get_front_schema</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">CompileImperativeDefn::get_front_schema</span></span>:<br/>Compile Invocations Inline - <a href="5-cii.html#SP3">&#167;3</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="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-cid.html#SP6_1" class="named-paragraph-link"><span class="named-paragraph">Construct the schemas from the inline text if this has not yet been done</span><span class="named-paragraph-number">6.1</span></a></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">idb</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">compilation_data</span><span class="plain-syntax">.</span><span class="identifier-syntax">inline_front_schema</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">inter_schema</span><span class="plain-syntax"> *</span><span class="function-syntax">CompileImperativeDefn::get_back_schema</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">CompileImperativeDefn::get_back_schema</span></span>:<br/>Compile Invocations Inline - <a href="5-cii.html#SP3">&#167;3</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="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="3-cid.html#SP6_1" class="named-paragraph-link"><span class="named-paragraph">Construct the schemas from the inline text if this has not yet been done</span><span class="named-paragraph-number">6.1</span></a></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">idb</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">compilation_data</span><span class="plain-syntax">.</span><span class="identifier-syntax">inline_back_schema</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP6_1" class="paragraph-anchor"></a><b>&#167;6.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Construct the schemas from the inline text if this has not yet been done</span><span class="named-paragraph-number">6.1</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">idb</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">compilation_data</span><span class="plain-syntax">.</span><span class="element-syntax">inter_defn_converted</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">idb</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">compilation_data</span><span class="plain-syntax">.</span><span class="element-syntax">inline_wn</span><span class="plain-syntax"> &gt;= </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ParsingSchemas::from_inline_phrase_definition</span><span class="plain-syntax">(</span>
<span class="plain-syntax"> </span><a href="3-cid.html#SP6" class="function-link"><span class="function-syntax">CompileImperativeDefn::get_inline_definition</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">idb</span><span class="plain-syntax">),</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="element-syntax">inline_front_schema</span><span class="plain-syntax">),</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="element-syntax">inline_back_schema</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><a href="3-cid.html#SP7" class="function-link"><span class="function-syntax">CompileImperativeDefn::issue_schema_errors</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </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="element-syntax">inline_front_schema</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </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="element-syntax">inline_back_schema</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </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="element-syntax">inter_defn_converted</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> }</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="3-cid.html#SP6">&#167;6</a> (twice).</li></ul>
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>&#167;7. </b></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::issue_schema_errors</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">CompileImperativeDefn::issue_schema_errors</span></span>:<br/><a href="3-cid.html#SP6_1">&#167;6.1</a><br/>Compile Invocations Inline - <a href="5-cii.html#SP5">&#167;5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sch1</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sch2</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">E</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">sch1</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">parsing_errors</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">sch2</span><span class="plain-syntax">) </span><span class="identifier-syntax">E</span><span class="plain-syntax"> += </span><span class="identifier-syntax">LinkedLists::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">sch2</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">parsing_errors</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">E</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">from</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_stream</span><span class="plain-syntax">(4, </span><span class="identifier-syntax">sch1</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">converted_from</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::handmade_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_InlineSchemaErrors</span><span class="plain-syntax">));</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
<span class="plain-syntax"> </span><span class="string-syntax">"In %1, syntax error(s) were found in the '(-' ... '-)' schema '%4':"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">schema_parsing_error</span><span class="plain-syntax"> *</span><span class="identifier-syntax">err</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">ec</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">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">sch1</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">sch1</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">parsing_errors</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">err</span><span class="plain-syntax">, </span><span class="identifier-syntax">schema_parsing_error</span><span class="plain-syntax">, </span><span class="identifier-syntax">sch1</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">parsing_errors</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_number</span><span class="plain-syntax">(2, &amp;</span><span class="identifier-syntax">ec</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_stream</span><span class="plain-syntax">(3, </span><span class="identifier-syntax">err</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">message</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span><span class="string-syntax">"%P (%2). %3"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ec</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">sch2</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">sch2</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">parsing_errors</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">err</span><span class="plain-syntax">, </span><span class="identifier-syntax">schema_parsing_error</span><span class="plain-syntax">, </span><span class="identifier-syntax">sch2</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">parsing_errors</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_number</span><span class="plain-syntax">(2, &amp;</span><span class="identifier-syntax">ec</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_stream</span><span class="plain-syntax">(3, </span><span class="identifier-syntax">err</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">message</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span><span class="string-syntax">"%P (%2). %3"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">ec</span><span class="plain-syntax">++;</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>&#167;8. </b>Non-inline compilation is sometimes the result of filling requests for
instantiation. The different requested versions then appear in the requests
package for the function:
</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::prepare_for_requests</span><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="plain-syntax"> </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="element-syntax">requests_package</span><span class="plain-syntax"> =</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Hierarchy::local_package_to</span><span class="plain-syntax">(</span><span class="identifier-syntax">PHRASES_HAP</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">-&gt;</span><span class="identifier-syntax">at</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">package_request</span><span class="plain-syntax"> *</span><span class="function-syntax">CompileImperativeDefn::requests_package</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">CompileImperativeDefn::requests_package</span></span>:<br/>Phrase Requests - <a href="3-pr.html#SP2_3">&#167;2.3</a><br/>Closures - <a href="3-cls.html#SP2">&#167;2</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="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </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">requests_package</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>&#167;9. Preparing the stack frame. </b>The stack frame needs to be made ready for compilation. The following
is called immediately the <span class="extract"><span class="extract-syntax">body</span></span> is created.
</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::initialise_stack_frame</span><span class="plain-syntax">(</span><span class="identifier-syntax">id_body</span><span class="plain-syntax"> *</span><span class="identifier-syntax">body</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">body</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">compilation_data</span><span class="plain-syntax">.</span><span class="element-syntax">id_stack_frame</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="3-cid.html#SP10" class="function-link"><span class="function-syntax">CompileImperativeDefn::set_up_stack_frame_for_compilation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">frame</span><span class="plain-syntax">, &amp;(</span><span class="identifier-syntax">body</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">IDTypeData::kind</span><span class="plain-syntax">(&amp;(</span><span class="identifier-syntax">body</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">type_data</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">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">PhraseOptions::allows_options</span><span class="plain-syntax">(</span><span class="identifier-syntax">body</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><a href="3-lv.html#SP5" class="function-link"><span class="function-syntax">LocalVariables::options_parameter_is_needed</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">frame</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP10" class="paragraph-anchor"></a><b>&#167;10. </b>However, <a href="3-cid.html#SP10" class="internal">CompileImperativeDefn::set_up_stack_frame_for_compilation</a> is also
called each time the definition is compiled: note that if a definition is being
instantiated for multiple different kinds, <span class="extract"><span class="extract-syntax">kind_in_this_compilation</span></span> will
vary, and will not be the same as the one supplied in
<a href="3-cid.html#SP9" class="internal">CompileImperativeDefn::initialise_stack_frame</a>.
</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::set_up_stack_frame_for_compilation</span><button class="popup" onclick="togglePopup('usagePopup9')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup9">Usage of <span class="code-font"><span class="function-syntax">CompileImperativeDefn::set_up_stack_frame_for_compilation</span></span>:<br/><a href="3-cid.html#SP2_2">&#167;2.2</a>, <a href="3-cid.html#SP9">&#167;9</a></span></button><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">,</span>
<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">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">kind_in_this_compilation</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">first</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">Kinds::get_construct</span><span class="plain-syntax">(</span><span class="identifier-syntax">kind_in_this_compilation</span><span class="plain-syntax">) != </span><span class="identifier-syntax">CON_phrase</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"not a function kind"</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">args</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, *</span><span class="identifier-syntax">ret</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::binary_construction_material</span><span class="plain-syntax">(</span><span class="identifier-syntax">kind_in_this_compilation</span><span class="plain-syntax">, &amp;</span><span class="identifier-syntax">args</span><span class="plain-syntax">, &amp;</span><span class="identifier-syntax">ret</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">N</span><span class="plain-syntax"> = </span><span class="identifier-syntax">IDTypeData::get_no_tokens</span><span class="plain-syntax">(</span><span class="identifier-syntax">idtd</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax">&lt;</span><span class="identifier-syntax">N</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</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">Kinds::get_construct</span><span class="plain-syntax">(</span><span class="identifier-syntax">args</span><span class="plain-syntax">) != </span><span class="identifier-syntax">CON_TUPLE_ENTRY</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"bad tupling"</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="plain-syntax"> </span><span class="identifier-syntax">Kinds::binary_construction_material</span><span class="plain-syntax">(</span><span class="identifier-syntax">args</span><span class="plain-syntax">, &amp;</span><span class="identifier-syntax">K</span><span class="plain-syntax">, &amp;</span><span class="identifier-syntax">args</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">first</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="3-lv.html#SP2" class="function-link"><span class="function-syntax">LocalVariables::new_call_parameter</span></a><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">-&gt;</span><span class="identifier-syntax">token_sequence</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">].</span><span class="identifier-syntax">token_name</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">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">local_variable</span><span class="plain-syntax"> *</span><span class="identifier-syntax">lvar</span><span class="plain-syntax"> = </span><a href="3-lv.html#SP15" class="function-link"><span class="function-syntax">LocalVariables::get_ith_parameter</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">frame</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</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">lvar</span><span class="plain-syntax">) </span><a href="3-lv.html#SP25" class="function-link"><span class="function-syntax">LocalVariables::set_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">lvar</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">);</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">Kinds::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">ret</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_nil</span><span class="plain-syntax">)) </span><a href="3-sf.html#SP7" class="function-link"><span class="function-syntax">Frames::set_kind_returned</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><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><a href="3-sf.html#SP7" class="function-link"><span class="function-syntax">Frames::set_kind_returned</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">frame</span><span class="plain-syntax">, </span><span class="identifier-syntax">ret</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
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