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<!--Weave of 'Value Holsters' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../intern.html">Inter Modules</a></li><li><a href="index.html">building</a></li><li><a href="index.html#3">Chapter 3: Masonry</a></li><li><b>Value Holsters</b></li></ul></div>
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<p class="purpose">Representing compilation contexts, and holding compiled values.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>Value holsters were created as a shim at a time when almost the entire Inform
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code-base had to be turned around. Pre-2017, Inform generated code by writing
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Inform 6 syntax out by hand: but post-2019, Inter bytecode was generated instead.
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Hundreds of subsystems had to be rewritten, a process taking over a year, and
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during this time the compiler had to work in a piebald sort of way — some
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systems generating bytecode, others still pouring our raw I6 as text.
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</p>
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<p class="commentary">The <a href="3-vh.html#SP1" class="internal">value_holster</a> was invented as a way to manage this. It allows the caller
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of a compilation function to ask for code to be made in a particular way: this
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is the <span class="extract"><span class="extract-syntax">vhmode_wanted</span></span> field. These ways are:
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</p>
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<ul class="items"><li>● <span class="extract"><span class="extract-syntax">INTER_VAL_VHMODE</span></span> — generate Inter bytecode inside a function, producing a value
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</li><li>● <span class="extract"><span class="extract-syntax">INTER_VOID_VHMODE</span></span> — generate Inter bytecode inside a function but in
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void context, i.e., not producing a value
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</li><li>● <span class="extract"><span class="extract-syntax">INTER_DATA_VHMODE</span></span> — encode a constant value as a pair of Inter values,
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for use in, say, an array entry.
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</li></ul>
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<p class="commentary">So much for what the caller wants. The compilation function, or subsystem, then
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does whatever it does, and sets <span class="extract"><span class="extract-syntax">vhmode_provided</span></span> to the mode it actually compiled
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in; the caller can then deal with the situation arising if it wasn't what was
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wanted. During 2017 this often meant that the function would write out some
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raw I6 syntax, and reply <span class="extract"><span class="extract-syntax">INTER_TEXT_VHMODE</span></span> to signal this; the caller would
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then turn this into Inter by wrapping it up as either a "splat" or a "glob".
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</p>
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<p class="commentary">With the transition now complete, <span class="extract"><span class="extract-syntax">INTER_TEXT_VHMODE</span></span> no longer exists. But
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value holsters continue to be a useful device.
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">enum</span> <span class="constant-syntax">INTER_DATA_VHMODE</span><span class="plain-syntax"> </span><span class="identifier-syntax">from</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span>
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<span class="definition-keyword">enum</span> <span class="constant-syntax">INTER_VAL_VHMODE</span>
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<span class="definition-keyword">enum</span> <span class="constant-syntax">INTER_VOID_VHMODE</span>
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<span class="definition-keyword">enum</span> <span class="constant-syntax">NO_VHMODE</span>
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</pre>
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<pre class="displayed-code all-displayed-code code-font">
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<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">value_holster</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">vhmode_wanted</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">vhmode_provided</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_pair</span><span class="plain-syntax"> </span><span class="identifier-syntax">val</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">value_holster</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure value_holster is accessed in 2/eis and here.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">value_holster</span><span class="plain-syntax"> </span><span class="function-syntax">Holsters::new</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">Holsters::new</span></span>:<br/>Emitting Inter Schemas - <a href="2-eis.html#SP3_1_8">§3.1.8</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">vhm</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">value_holster</span><span class="plain-syntax"> </span><span class="identifier-syntax">vh</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">vh</span><span class="plain-syntax">.</span><span class="element-syntax">val</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterValuePairs::undef</span><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">vh</span><span class="plain-syntax">.</span><span class="element-syntax">vhmode_wanted</span><span class="plain-syntax"> = </span><span class="identifier-syntax">vhm</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">vh</span><span class="plain-syntax">.</span><span class="element-syntax">vhmode_provided</span><span class="plain-syntax"> = </span><span class="constant-syntax">NO_VHMODE</span><span class="plain-syntax">; </span><span class="comment-syntax"> the compilation function has not yet set this</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">vhm</span><span class="plain-syntax"> == </span><span class="constant-syntax">NO_VHMODE</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"can't want NO_VHMODE"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">vh</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>A compilation function can produce, as its output, a value in either
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<span class="extract"><span class="extract-syntax">INTER_DATA_VHMODE</span></span> (where this is exactly what is wanted) or in <span class="extract"><span class="extract-syntax">INTER_VAL_VHMODE</span></span>
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(where it can easily be adapted).
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Holsters::value_pair_allowed</span><span class="plain-syntax">(</span><span class="reserved-syntax">value_holster</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vh</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">vh</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no VH"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">vh</span><span class="plain-syntax">-></span><span class="element-syntax">vhmode_wanted</span><span class="plain-syntax"> == </span><span class="constant-syntax">INTER_DATA_VHMODE</span><span class="plain-syntax">) ||</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">vh</span><span class="plain-syntax">-></span><span class="element-syntax">vhmode_wanted</span><span class="plain-syntax"> == </span><span class="constant-syntax">INTER_VAL_VHMODE</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>
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<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>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>This is how a compilation function "holsters" a value pair:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Holsters::holster_pair</span><span class="plain-syntax">(</span><span class="reserved-syntax">value_holster</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vh</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_pair</span><span class="plain-syntax"> </span><span class="identifier-syntax">val</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">vh</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no VH"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">vh</span><span class="plain-syntax">-></span><span class="element-syntax">val</span><span class="plain-syntax"> = </span><span class="identifier-syntax">val</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">vh</span><span class="plain-syntax">-></span><span class="element-syntax">vhmode_provided</span><span class="plain-syntax"> = </span><span class="constant-syntax">INTER_DATA_VHMODE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>And this is how the caller "unholsters" that value, after the function has
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returned. If we find <span class="extract"><span class="extract-syntax">NO_VHMODE</span></span>, we convert that to <span class="extract"><span class="extract-syntax">INTER_DATA_VHMODE</span></span> with
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the literal number value 0.
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</p>
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<p class="commentary">On exit, the provided mode is always <span class="extract"><span class="extract-syntax">INTER_DATA_VHMODE</span></span>.
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</p>
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<p class="commentary">A second or subsequent call on the same holster does nothing, except to return
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the same value pair, which is still stored in it. (In that sense, these aren't
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really like a gunslinger's holster, where a revolver once drawn is no longer
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in the holster.)
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">inter_pair</span><span class="plain-syntax"> </span><span class="function-syntax">Holsters::unholster_to_pair</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">Holsters::unholster_to_pair</span></span>:<br/><a href="3-vh.html#SP6">§6</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">value_holster</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vh</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">vh</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no VH"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">vh</span><span class="plain-syntax">-></span><span class="element-syntax">vhmode_provided</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">INTER_DATA_VHMODE:</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">INTER_VAL_VHMODE:</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"impossible to unholster pair for compiled val code"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">INTER_VOID_VHMODE:</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"impossible to unholster pair for compiled void code"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">NO_VHMODE:</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">vh</span><span class="plain-syntax">-></span><span class="element-syntax">vhmode_provided</span><span class="plain-syntax"> = </span><span class="constant-syntax">INTER_DATA_VHMODE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">vh</span><span class="plain-syntax">-></span><span class="element-syntax">val</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterValuePairs::number</span><span class="plain-syntax">(0);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">vh</span><span class="plain-syntax">-></span><span class="element-syntax">val</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>If, on the other hand, the caller was asking for <span class="extract"><span class="extract-syntax">INTER_VAL_VHMODE</span></span>, it
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should make use of the following. If we find <span class="extract"><span class="extract-syntax">NO_VHMODE</span></span>, we compile a <span class="extract"><span class="extract-syntax">val</span></span>
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producing the literal value 0; if we find <span class="extract"><span class="extract-syntax">INTER_DATA_VHMODE</span></span>, we compile a
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<span class="extract"><span class="extract-syntax">val</span></span> producing whatever value was holstered.
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</p>
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<p class="commentary">On exit, the provided mode is always <span class="extract"><span class="extract-syntax">INTER_VAL_VHMODE</span></span>.
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</p>
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<p class="commentary">A second or subsequent call on the same holster does nothing.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Holsters::unholster_to_code_val</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_tree</span><span class="plain-syntax"> *</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="reserved-syntax">value_holster</span><span class="plain-syntax"> *</span><span class="identifier-syntax">vh</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">vh</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no VH"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">vh</span><span class="plain-syntax">-></span><span class="element-syntax">vhmode_provided</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">INTER_DATA_VHMODE:</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">NO_VHMODE:</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_pair</span><span class="plain-syntax"> </span><span class="identifier-syntax">val</span><span class="plain-syntax"> = </span><a href="3-vh.html#SP5" class="function-link"><span class="function-syntax">Holsters::unholster_to_pair</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">vh</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="3-prd.html#SP32" class="function-link"><span class="function-syntax">Produce::val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">vh</span><span class="plain-syntax">-></span><span class="element-syntax">vhmode_provided</span><span class="plain-syntax"> = </span><span class="constant-syntax">INTER_VAL_VHMODE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">INTER_VAL_VHMODE:</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">INTER_VOID_VHMODE:</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"impossible to use void Inter code in val context"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax">}</span>
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</pre>
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