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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#5">Chapter 5: Invocations</a></li><li><b>Compile Invocations As Calls</b></li></ul></div>
<p class="purpose">An invocation defined with Inform 7 source text is made with an Inter function call.</p>
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>Compiling an invocation into a call to an Inter function is simple enough:
</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">CallingFunctions::csi_by_call</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">CallingFunctions::csi_by_call</span></span>:<br/>Compile Invocations - <a href="5-ci.html#SP2_1_2">&#167;2.1.2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">value_holster</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inv</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">source_location</span><span class="plain-syntax"> *</span><span class="identifier-syntax">where_from</span><span class="plain-syntax">, </span><span class="reserved-syntax">tokens_packet</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tokens</span><span class="plain-syntax">) {</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">Node::get_phrase_invoked</span><span class="plain-syntax">(</span><span class="identifier-syntax">inv</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">IS</span><span class="plain-syntax"> = </span><a href="3-pr.html#SP1" class="function-link"><span class="function-syntax">PhraseRequests::complex_request</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">idb</span><span class="plain-syntax">, </span><span class="identifier-syntax">tokens</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">fn_kind</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Node::get_kind_variable_declarations</span><span class="plain-syntax">(</span><span class="identifier-syntax">inv</span><span class="plain-syntax">), </span><span class="identifier-syntax">Node::get_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">inv</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">MATCHING</span><span class="plain-syntax">, </span><span class="string-syntax">"Calling function %n with kind %u from $e\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">IS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">tokens</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">fn_kind</span><span class="plain-syntax">, </span><span class="identifier-syntax">inv</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">options_supplied</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Invocations::get_phrase_options_bitmap</span><span class="plain-syntax">(</span><span class="identifier-syntax">inv</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::get_phrase_options_invoked</span><span class="plain-syntax">(</span><span class="identifier-syntax">inv</span><span class="plain-syntax">) == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">options_supplied</span><span class="plain-syntax"> = -1;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">VH</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">vhmode_wanted</span><span class="plain-syntax"> == </span><span class="identifier-syntax">INTER_VAL_VHMODE</span><span class="plain-syntax">) </span><span class="identifier-syntax">VH</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">vhmode_provided</span><span class="plain-syntax"> = </span><span class="identifier-syntax">INTER_VAL_VHMODE</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">VH</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">vhmode_provided</span><span class="plain-syntax"> = </span><span class="identifier-syntax">INTER_VOID_VHMODE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><a href="5-ciac.html#SP2" class="function-link"><span class="function-syntax">CallingFunctions::direct_function_call</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">tokens</span><span class="plain-syntax">, </span><span class="identifier-syntax">IS</span><span class="plain-syntax">, </span><span class="identifier-syntax">options_supplied</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>The following can be used to call any phrase compiled to an I6 routine,
and it's used not only by the code above, but also when calling a
phrase value stored dynamically at run-time.
</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">CallingFunctions::direct_function_call</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">CallingFunctions::direct_function_call</span></span>:<br/><a href="5-ciac.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">tokens_packet</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tokens</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">identifier</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">phrase_options</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">return_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="named-paragraph-container code-font"><a href="5-ciac.html#SP2_1" class="named-paragraph-link"><span class="named-paragraph">Compute the return kind of the phrase</span><span class="named-paragraph-number">2.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">EmitCode::call</span><span class="plain-syntax">(</span><span class="identifier-syntax">identifier</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="named-paragraph-container code-font"><a href="5-ciac.html#SP2_2" class="named-paragraph-link"><span class="named-paragraph">Emit the comma-separated list of arguments</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">EmitCode::up</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">Compute the return kind of the phrase</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="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax"> = </span><span class="identifier-syntax">tokens</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">fn_kind</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">K</span><span class="plain-syntax">) != </span><span class="identifier-syntax">CON_phrase</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no function kind"</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">K</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, &amp;</span><span class="identifier-syntax">return_kind</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="5-ciac.html#SP2">&#167;2</a>, <a href="5-ciac.html#SP3">&#167;3</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP2_2" class="paragraph-anchor"></a><b>&#167;2.2. </b>If the return kind stores values on the heap, we must call the function with
a pointer to a new value of that kind as the first argument. Arguments corresponding
to the tokens then follow, and finally the optional bitmap of phrase options.
</p>
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Emit the comma-separated list of arguments</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::Behaviour::uses_block_values</span><span class="plain-syntax">(</span><span class="identifier-syntax">return_kind</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><a href="3-sf.html#SP21" class="function-link"><span class="function-syntax">Frames::emit_new_local_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">return_kind</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">k</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">k</span><span class="function-syntax">&lt;tokens-&gt;</span><span class="element-syntax">tokens_count</span><span class="plain-syntax">; </span><span class="identifier-syntax">k</span><span class="plain-syntax">++)</span>
<span class="plain-syntax"> </span><a href="2-cv.html#SP5" class="function-link"><span class="function-syntax">CompileValues::to_fresh_code_val_of_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">tokens</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">token_vals</span><span class="plain-syntax">[</span><span class="identifier-syntax">k</span><span class="plain-syntax">], </span><span class="identifier-syntax">tokens</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">token_kinds</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">phrase_options</span><span class="plain-syntax"> != -1)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">EmitCode::val_number</span><span class="plain-syntax">((</span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax">) </span><span class="identifier-syntax">phrase_options</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="5-ciac.html#SP2">&#167;2</a>, <a href="5-ciac.html#SP3">&#167;3</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b>The indirect version of the function is used when a function whose address
is not known at compile time must be called; this is needed in a few inline
invocations.
</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">CallingFunctions::indirect_function_call</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">CallingFunctions::indirect_function_call</span></span>:<br/>Compile Invocations Inline - <a href="5-cii.html#SP6_7_1">&#167;6.7.1</a>, <a href="5-cii.html#SP6_7_2">&#167;6.7.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">tokens_packet</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tokens</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">indirect_spec</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">lookup_flag</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">return_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="named-paragraph-container code-font"><a href="5-ciac.html#SP2_1" class="named-paragraph-link"><span class="named-paragraph">Compute the return kind of the phrase</span><span class="named-paragraph-number">2.1</span></a></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">arity</span><span class="plain-syntax"> = </span><span class="identifier-syntax">tokens</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">tokens_count</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::Behaviour::uses_block_values</span><span class="plain-syntax">(</span><span class="identifier-syntax">return_kind</span><span class="plain-syntax">)) </span><span class="identifier-syntax">arity</span><span class="plain-syntax">++;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">BIP</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Primitives::BIP_for_indirect_call_returning_value</span><span class="plain-syntax">(</span><span class="identifier-syntax">arity</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">EmitCode::inv</span><span class="plain-syntax">(</span><span class="identifier-syntax">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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">lookup_flag</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">EmitCode::inv</span><span class="plain-syntax">(</span><span class="identifier-syntax">LOOKUP_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><a href="2-cv.html#SP5" class="function-link"><span class="function-syntax">CompileValues::to_code_val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">indirect_spec</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">EmitCode::val_number</span><span class="plain-syntax">(1);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">EmitCode::up</span><span class="plain-syntax">();</span>
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><a href="2-cv.html#SP5" class="function-link"><span class="function-syntax">CompileValues::to_code_val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">indirect_spec</span><span class="plain-syntax">);</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">phrase_options</span><span class="plain-syntax"> = -1;</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-ciac.html#SP2_2" class="named-paragraph-link"><span class="named-paragraph">Emit the comma-separated list of arguments</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">EmitCode::up</span><span class="plain-syntax">();</span>
<span class="plain-syntax">}</span>
</pre>
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