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Graham Nelson bb13993e92 Made template assimilation possible by inter alone
2019-08-31 13:56:36 +01:00

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<ul class="crumbs"><li><a href="../webs.html">&#9733;</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><p class="purpose">To manage requests for compilation to Inter.</p>
<ul class="toc"><li><a href="#SP3">&#167;3. Conversions</a></li><li><a href="#SP4">&#167;4. Holstering data</a></li></ul><hr class="tocbar">
<p class="inwebparagraph"><a id="SP1"></a><b>&#167;1. </b></p>
<pre class="definitions">
<span class="definitionkeyword">enum</span> <span class="constant">INTER_DATA_VHMODE</span><span class="definitionkeyword"> from </span><span class="constant">1</span>
<span class="definitionkeyword">enum</span> <span class="constant">INTER_VAL_VHMODE</span>
<span class="definitionkeyword">enum</span> <span class="constant">INTER_VOID_VHMODE</span>
<span class="definitionkeyword">enum</span> <span class="constant">NO_VHMODE</span>
</pre>
<pre class="display">
<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">struct</span><span class="plain"> </span><span class="reserved">value_holster</span><span class="plain"> {</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">vhmode_wanted</span><span class="plain">;</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">vhmode_provided</span><span class="plain">;</span>
<span class="identifier">inter_t</span><span class="plain"> </span><span class="identifier">val1</span><span class="plain">, </span><span class="identifier">val2</span><span class="plain">;</span>
<span class="plain">} </span><span class="reserved">value_holster</span><span class="plain">;</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The structure value_holster is private to this section.</p>
<p class="inwebparagraph"><a id="SP2"></a><b>&#167;2. </b></p>
<pre class="display">
<span class="reserved">value_holster</span><span class="plain"> </span><span class="functiontext">Holsters::new</span><span class="plain">(</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">vhm</span><span class="plain">) {</span>
<span class="reserved">value_holster</span><span class="plain"> </span><span class="identifier">vh</span><span class="plain">;</span>
<span class="identifier">vh</span><span class="element">.val1</span><span class="plain"> = 0; </span><span class="identifier">vh</span><span class="plain">.</span><span class="identifier">val2</span><span class="plain"> = 0;</span>
<span class="identifier">vh</span><span class="element">.vhmode_wanted</span><span class="plain"> = </span><span class="identifier">vhm</span><span class="plain">;</span>
<span class="identifier">vh</span><span class="element">.vhmode_provided</span><span class="plain"> = </span><span class="constant">NO_VHMODE</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">vhm</span><span class="plain"> == </span><span class="constant">NO_VHMODE</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"can't want NO_VHMODE"</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">vh</span><span class="plain">;</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The function Holsters::new is used in 2/eis (<a href="2-eis.html#SP3_1">&#167;3.1</a>).</p>
<p class="inwebparagraph"><a id="SP3"></a><b>&#167;3. Conversions. </b></p>
<pre class="display">
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">Holsters::data_acceptable</span><span class="plain">(</span><span class="reserved">value_holster</span><span class="plain"> *</span><span class="identifier">vh</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">vh</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"no VH"</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">vh</span><span class="plain">-</span><span class="element">&gt;vhmode_wanted</span><span class="plain"> == </span><span class="constant">INTER_DATA_VHMODE</span><span class="plain">) ||</span>
<span class="plain">(</span><span class="identifier">vh</span><span class="plain">-</span><span class="element">&gt;vhmode_wanted</span><span class="plain"> == </span><span class="constant">INTER_VAL_VHMODE</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Holsters::to_val_mode</span><span class="plain">(</span><span class="identifier">inter_tree</span><span class="plain"> *</span><span class="identifier">I</span><span class="plain">, </span><span class="reserved">value_holster</span><span class="plain"> *</span><span class="identifier">vh</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">vh</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"no VH"</span><span class="plain">);</span>
<span class="reserved">switch</span><span class="plain"> (</span><span class="identifier">vh</span><span class="plain">-</span><span class="element">&gt;vhmode_provided</span><span class="plain">) {</span>
<span class="reserved">case</span><span class="plain"> </span><span class="constant">INTER_DATA_VHMODE</span><span class="plain">:</span>
<span class="functiontext">Produce::val</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">K_value</span><span class="plain">, </span><span class="identifier">vh</span><span class="plain">-</span><span class="element">&gt;val1</span><span class="plain">, </span><span class="identifier">vh</span><span class="plain">-&gt;</span><span class="identifier">val2</span><span class="plain">);</span>
<span class="reserved">break</span><span class="plain">;</span>
<span class="reserved">case</span><span class="plain"> </span><span class="constant">INTER_VOID_VHMODE</span><span class="plain">:</span>
<span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"impossible conversion"</span><span class="plain">);</span>
<span class="reserved">break</span><span class="plain">;</span>
<span class="reserved">case</span><span class="plain"> </span><span class="constant">NO_VHMODE</span><span class="plain">:</span>
<span class="identifier">vh</span><span class="plain">-</span><span class="element">&gt;val1</span><span class="plain"> = </span><span class="identifier">LITERAL_IVAL</span><span class="plain">; </span><span class="identifier">vh</span><span class="plain">-&gt;</span><span class="identifier">val2</span><span class="plain"> = 0;</span>
<span class="functiontext">Produce::val</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">K_value</span><span class="plain">, </span><span class="identifier">vh</span><span class="plain">-</span><span class="element">&gt;val1</span><span class="plain">, </span><span class="identifier">vh</span><span class="plain">-&gt;</span><span class="identifier">val2</span><span class="plain">);</span>
<span class="reserved">break</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="identifier">vh</span><span class="plain">-</span><span class="element">&gt;vhmode_provided</span><span class="plain"> = </span><span class="constant">INTER_VAL_VHMODE</span><span class="plain">;</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The function Holsters::data_acceptable appears nowhere else.</p>
<p class="endnote">The function Holsters::to_val_mode appears nowhere else.</p>
<p class="inwebparagraph"><a id="SP4"></a><b>&#167;4. Holstering data. </b></p>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Holsters::holster_pair</span><span class="plain">(</span><span class="reserved">value_holster</span><span class="plain"> *</span><span class="identifier">vh</span><span class="plain">, </span><span class="identifier">inter_t</span><span class="plain"> </span><span class="identifier">v1</span><span class="plain">, </span><span class="identifier">inter_t</span><span class="plain"> </span><span class="identifier">v2</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">vh</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"no VH"</span><span class="plain">);</span>
<span class="identifier">vh</span><span class="plain">-</span><span class="element">&gt;val1</span><span class="plain"> = </span><span class="identifier">v1</span><span class="plain">; </span><span class="identifier">vh</span><span class="plain">-&gt;</span><span class="identifier">val2</span><span class="plain"> = </span><span class="identifier">v2</span><span class="plain">;</span>
<span class="identifier">vh</span><span class="plain">-</span><span class="element">&gt;vhmode_provided</span><span class="plain"> = </span><span class="constant">INTER_DATA_VHMODE</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Holsters::unholster_pair</span><span class="plain">(</span><span class="reserved">value_holster</span><span class="plain"> *</span><span class="identifier">vh</span><span class="plain">, </span><span class="identifier">inter_t</span><span class="plain"> *</span><span class="identifier">v1</span><span class="plain">, </span><span class="identifier">inter_t</span><span class="plain"> *</span><span class="identifier">v2</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">vh</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"no VH"</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">vh</span><span class="plain">-</span><span class="element">&gt;vhmode_provided</span><span class="plain"> != </span><span class="constant">INTER_DATA_VHMODE</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">vh</span><span class="plain">-</span><span class="element">&gt;vhmode_provided</span><span class="plain"> != </span><span class="constant">NO_VHMODE</span><span class="plain">)</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">problem_count</span><span class="plain"> == 0) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"errant DV"</span><span class="plain">);</span>
<span class="identifier">vh</span><span class="plain">-</span><span class="element">&gt;val1</span><span class="plain"> = </span><span class="identifier">LITERAL_IVAL</span><span class="plain">; </span><span class="identifier">vh</span><span class="plain">-&gt;</span><span class="identifier">val2</span><span class="plain"> = 0;</span>
<span class="identifier">vh</span><span class="plain">-</span><span class="element">&gt;vhmode_provided</span><span class="plain"> = </span><span class="constant">INTER_DATA_VHMODE</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="plain">*</span><span class="identifier">v1</span><span class="plain"> = </span><span class="identifier">vh</span><span class="plain">-</span><span class="element">&gt;val1</span><span class="plain">; *</span><span class="identifier">v2</span><span class="plain"> = </span><span class="identifier">vh</span><span class="plain">-&gt;</span><span class="identifier">val2</span><span class="plain">;</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The function Holsters::holster_pair appears nowhere else.</p>
<p class="endnote">The function Holsters::unholster_pair appears nowhere else.</p>
<hr class="tocbar">
<ul class="toc"><li><a href="3-pi.html">Back to 'Producing Inter'</a></li><li><i>(This section ends Chapter 3: Masonry.)</i></li></ul><hr class="tocbar">
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