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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Services</a></li><li><a href="index.html">arch</a></li><li><a href="index.html#2">Chapter 2: Architectures and VMs</a></li><li><b>Architectures</b></li></ul></div>
<p class="purpose">To deal with multiple inter architectures.</p>
<ul class="toc"><li><a href="2-arc.html#SP1">&#167;1. Architectures</a></li><li><a href="2-arc.html#SP3">&#167;3. Standard set</a></li><li><a href="2-arc.html#SP4">&#167;4. Canonical filenames</a></li><li><a href="2-arc.html#SP5">&#167;5. Shorthand</a></li><li><a href="2-arc.html#SP6">&#167;6. What an architecture offers</a></li></ul><hr class="tocbar">
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. Architectures. </b>An "architecture" is a choice of how to use Inter code: for example, with the
expectation that it will have 32-bit rather than 16-bit integers. These are
not different Inter formats: two Inter files could, in fact, be identical
and yet one could be intended to be code-generated to a 32-bit program
and another to 16-bit. In effect, an "architecture" holds the settings which
<a href="../inform7/index.html" class="internal">inform7</a> uses when turning source text into Inter code.
</p>
<p class="commentary">Each different architecture is represented by one of these:
</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">inter_architecture</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">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">shorthand</span><span class="plain-syntax">; </span><span class="comment-syntax"> such as </span><span class="extract"><span class="extract-syntax">32d</span></span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">sixteen_bit</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">debug_enabled</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">inter_architecture</span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>The structure inter_architecture is private to this section.</li></ul>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b></p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">inter_architecture</span><span class="plain-syntax"> *</span><span class="function-syntax">Architectures::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">Architectures::new</span></span>:<br/><a href="2-arc.html#SP3">&#167;3</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">code</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">s</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">d</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_architecture</span><span class="plain-syntax"> *</span><span class="identifier-syntax">A</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_architecture</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">A</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">shorthand</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">code</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">A</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">sixteen_bit</span><span class="plain-syntax"> = </span><span class="identifier-syntax">s</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">A</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">debug_enabled</span><span class="plain-syntax"> = </span><span class="identifier-syntax">d</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">A</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. Standard set. </b>This is called when the <a href="index.html" class="internal">arch</a> module starts up; no other architectures
are ever made.
</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">Architectures::create</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">Architectures::create</span></span>:<br/>Arch Module - <a href="1-am.html#SP3">&#167;3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="2-arc.html#SP2" class="function-link"><span class="function-syntax">Architectures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"16"</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-arc.html#SP2" class="function-link"><span class="function-syntax">Architectures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"16d"</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-arc.html#SP2" class="function-link"><span class="function-syntax">Architectures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"32"</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-arc.html#SP2" class="function-link"><span class="function-syntax">Architectures::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"32d"</span><span class="plain-syntax">, </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. Canonical filenames. </b>When a kit is assimilated, its Inter code is stored in files with these
leafnames:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="function-syntax">Architectures::canonical_binary</span><span class="plain-syntax">(</span><span class="identifier-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_architecture</span><span class="plain-syntax"> *</span><span class="identifier-syntax">A</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">A</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 arch"</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">leafname</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">leafname</span><span class="plain-syntax">, </span><span class="string-syntax">"arch-%S.interb"</span><span class="plain-syntax">, </span><span class="identifier-syntax">A</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">shorthand</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Filenames::in</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">leafname</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">leafname</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">F</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="function-syntax">Architectures::canonical_textual</span><span class="plain-syntax">(</span><span class="identifier-syntax">pathname</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_architecture</span><span class="plain-syntax"> *</span><span class="identifier-syntax">A</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">A</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 arch"</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">leafname</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">leafname</span><span class="plain-syntax">, </span><span class="string-syntax">"arch-%S.intert"</span><span class="plain-syntax">, </span><span class="identifier-syntax">A</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">shorthand</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Filenames::in</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">leafname</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">leafname</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">F</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. Shorthand. </b>These functions turn an architecture into a text like <span class="extract"><span class="extract-syntax">16d</span></span> and back again:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">Architectures::to_codename</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_architecture</span><span class="plain-syntax"> *</span><span class="identifier-syntax">A</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">A</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</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">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">A</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">shorthand</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">inter_architecture</span><span class="plain-syntax"> *</span><span class="function-syntax">Architectures::from_codename</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">Architectures::from_codename</span></span>:<br/>Target Virtual Machines - <a href="2-tvm.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">name</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_architecture</span><span class="plain-syntax"> *</span><span class="identifier-syntax">A</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER</span><span class="plain-syntax">(</span><span class="identifier-syntax">A</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_architecture</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">Str::eq_insensitive</span><span class="plain-syntax">(</span><span class="identifier-syntax">A</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">shorthand</span><span class="plain-syntax">, </span><span class="identifier-syntax">name</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">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">NULL</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. What an architecture offers. </b>At present, this all there is, so in a sense all possible architectures exist:
</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">Architectures::is_16_bit</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">Architectures::is_16_bit</span></span>:<br/>Target Virtual Machines - <a href="2-tvm.html#SP2">&#167;2</a>, <a href="2-tvm.html#SP7">&#167;7</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_architecture</span><span class="plain-syntax"> *</span><span class="identifier-syntax">A</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">A</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 arch"</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">A</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">sixteen_bit</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Architectures::debug_enabled</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">Architectures::debug_enabled</span></span>:<br/>Target Virtual Machines - <a href="2-tvm.html#SP7">&#167;7</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_architecture</span><span class="plain-syntax"> *</span><span class="identifier-syntax">A</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">A</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 arch"</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">A</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">debug_enabled</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
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