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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Shared Modules</a></li><li><a href="index.html">arch</a></li><li><a href="index.html#2">Chapter 2: Architectures</a></li><li><b>Target Virtual Machines</b></li></ul></div>
<p class="purpose">To deal with multiple inter architectures.</p>
<ul class="toc"><li><a href="2-tvm.html#SP1">&#167;1. Architectures</a></li></ul><hr class="tocbar">
<p class="commentary firstcommentary"><a id="SP1"></a><b>&#167;1. Architectures. </b></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">target_vm</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">family_name</span><span class="plain-syntax">; </span><span class="comment-syntax"> such as </span><span class="extract"><span class="extract-syntax">Glulx</span></span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">with_debugging_enabled</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">inter_architecture</span><span class="plain-syntax"> *</span><span class="identifier-syntax">architecture</span><span class="plain-syntax">; </span><span class="comment-syntax"> such as 32d</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">semantic_version_number</span><span class="plain-syntax"> </span><span class="identifier-syntax">version</span><span class="plain-syntax">; </span><span class="comment-syntax"> such as 0.8.7</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">VM_extension</span><span class="plain-syntax">; </span><span class="comment-syntax"> canonical filename extension</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">VM_unblorbed_extension</span><span class="plain-syntax">; </span><span class="comment-syntax"> such as </span><span class="extract"><span class="extract-syntax">z8</span></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">VM_blorbed_extension</span><span class="plain-syntax">; </span><span class="comment-syntax"> when blorbed up</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">VM_image</span><span class="plain-syntax">; </span><span class="comment-syntax"> filename of image for icon denoting VM</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">max_locals</span><span class="plain-syntax">; </span><span class="comment-syntax"> upper limit on local variables per stack frame</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">default_browser_interpreter</span><span class="plain-syntax">; </span><span class="comment-syntax"> e.g., "Parchment"</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">iFiction_format_name</span><span class="plain-syntax">; </span><span class="comment-syntax"> e.g., "zcode": see the Treaty of Babel</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">supports_floating_point</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">MEMORY_MANAGEMENT</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">target_vm</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="function-syntax">TargetVMs::new</span><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="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">nick</span><span class="plain-syntax">, </span><span class="identifier-syntax">semantic_version_number</span><span class="plain-syntax"> </span><span class="identifier-syntax">V</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">image</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">interpreter</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">blorbed</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">arch</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</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">max_locals</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iFiction</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">target_vm</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">family_name</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">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">version</span><span class="plain-syntax"> = </span><span class="identifier-syntax">V</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">VM_extension</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">nick</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">VM_unblorbed_extension</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">nick</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">VM_blorbed_extension</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">blorbed</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">VM_image</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">image</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">max_locals</span><span class="plain-syntax"> = </span><span class="identifier-syntax">max_locals</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">default_browser_interpreter</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">interpreter</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">architecture</span><span class="plain-syntax"> = </span><a href="2-arc.html#SP1" class="function-link"><span class="function-syntax">Architectures::from_codename</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">arch</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">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">architecture</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 such architecture"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">with_debugging_enabled</span><span class="plain-syntax"> = </span><span class="identifier-syntax">debug</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">supports_floating_point</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><a href="2-arc.html#SP1" class="function-link"><span class="function-syntax">Architectures::is_16_bit</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">architecture</span><span class="plain-syntax">)) </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">supports_floating_point</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">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">iFiction_format_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">iFiction</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">VM</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">TargetVMs::write</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">TargetVMs::write</span></span>:<br/>Compatibility - <a href="2-cmp.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</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">VM</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"none"</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">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">family_name</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">semantic_version_number</span><span class="plain-syntax"> </span><span class="identifier-syntax">V</span><span class="plain-syntax"> = </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">version</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">VersionNumbers::is_null</span><span class="plain-syntax">(</span><span class="identifier-syntax">V</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" version %v"</span><span class="plain-syntax">, &amp;</span><span class="identifier-syntax">V</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">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">with_debugging_enabled</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" with debugging"</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">TargetVMs::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">TargetVMs::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><span class="comment-syntax"> hat tip: Joel Berez and Marc Blank, 1979, and later hands</span>
<span class="plain-syntax"> </span><a href="2-tvm.html#SP1" class="function-link"><span class="function-syntax">TargetVMs::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"Z-Machine"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"z5"</span><span class="plain-syntax">, </span><span class="identifier-syntax">VersionNumbers::from_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"5"</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="string-syntax">"vm_z5.png"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Parchment"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"zblorb"</span><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">FALSE</span><span class="plain-syntax">, </span><span class="constant-syntax">15</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"zcode"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-tvm.html#SP1" class="function-link"><span class="function-syntax">TargetVMs::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"Z-Machine"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"z5"</span><span class="plain-syntax">, </span><span class="identifier-syntax">VersionNumbers::from_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"5"</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="string-syntax">"vm_z5.png"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Parchment"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"zblorb"</span><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="constant-syntax">15</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"zcode"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-tvm.html#SP1" class="function-link"><span class="function-syntax">TargetVMs::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"Z-Machine"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"z8"</span><span class="plain-syntax">, </span><span class="identifier-syntax">VersionNumbers::from_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"8"</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="string-syntax">"vm_z8.png"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Parchment"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"zblorb"</span><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">FALSE</span><span class="plain-syntax">, </span><span class="constant-syntax">15</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"zcode"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-tvm.html#SP1" class="function-link"><span class="function-syntax">TargetVMs::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"Z-Machine"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"z8"</span><span class="plain-syntax">, </span><span class="identifier-syntax">VersionNumbers::from_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"8"</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="string-syntax">"vm_z8.png"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Parchment"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"zblorb"</span><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="constant-syntax">15</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"zcode"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="comment-syntax"> hat tip: Andrew Plotkin, 2000</span>
<span class="plain-syntax"> </span><a href="2-tvm.html#SP1" class="function-link"><span class="function-syntax">TargetVMs::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"Glulx"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"ulx"</span><span class="plain-syntax">, </span><span class="identifier-syntax">VersionNumbers::from_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"3.1.2"</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="string-syntax">"vm_glulx.png"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Quixe"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"gblorb"</span><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="constant-syntax">256</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"glulx"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-tvm.html#SP1" class="function-link"><span class="function-syntax">TargetVMs::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"Glulx"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"ulx"</span><span class="plain-syntax">, </span><span class="identifier-syntax">VersionNumbers::from_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"3.1.2"</span><span class="plain-syntax">),</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="string-syntax">"vm_glulx.png"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Quixe"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"gblorb"</span><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">TRUE</span><span class="plain-syntax">, </span><span class="constant-syntax">256</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"glulx"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="function-syntax">TargetVMs::find</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ext</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">debug</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">result</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">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">ext</span><span class="plain-syntax">) == </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">ext</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="string-syntax">"ulx"</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">file_extension</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Str::copy</span><span class="plain-syntax">(</span><span class="identifier-syntax">file_extension</span><span class="plain-syntax">, </span><span class="identifier-syntax">ext</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::get_first_char</span><span class="plain-syntax">(</span><span class="identifier-syntax">file_extension</span><span class="plain-syntax">) == </span><span class="character-syntax">'.'</span><span class="plain-syntax">) </span><span class="identifier-syntax">Str::delete_first_character</span><span class="plain-syntax">(</span><span class="identifier-syntax">file_extension</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="identifier-syntax">file_extension</span><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">Str::put</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">, </span><span class="identifier-syntax">Characters::tolower</span><span class="plain-syntax">(</span><span class="identifier-syntax">Str::get</span><span class="plain-syntax">(</span><span class="identifier-syntax">pos</span><span class="plain-syntax">)));</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</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">VM</span><span class="plain-syntax">, </span><span class="reserved-syntax">target_vm</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">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">VM_unblorbed_extension</span><span class="plain-syntax">, </span><span class="identifier-syntax">ext</span><span class="plain-syntax">)) &amp;&amp;</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">with_debugging_enabled</span><span class="plain-syntax"> == </span><span class="identifier-syntax">debug</span><span class="plain-syntax">))</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">result</span><span class="plain-syntax"> = </span><span class="identifier-syntax">VM</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">file_extension</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">result</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="function-syntax">TargetVMs::find_in_family</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">family</span><span class="plain-syntax">, </span><span class="identifier-syntax">semantic_version_number</span><span class="plain-syntax"> </span><span class="identifier-syntax">V</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">debug</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</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">VM</span><span class="plain-syntax">, </span><span class="reserved-syntax">target_vm</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">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">family_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">family</span><span class="plain-syntax">)) &amp;&amp;</span>
<span class="plain-syntax"> (</span><span class="identifier-syntax">VersionNumbers::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">version</span><span class="plain-syntax">, </span><span class="identifier-syntax">V</span><span class="plain-syntax">)) &amp;&amp;</span>
<span class="plain-syntax"> ((</span><span class="identifier-syntax">debug</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NOT_APPLICABLE</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">debug</span><span class="plain-syntax"> == </span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">with_debugging_enabled</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">VM</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>
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">TargetVMs::is_16_bit</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">TargetVMs::is_16_bit</span></span>:<br/>Compatibility - <a href="2-cmp.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</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">VM</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 VM"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-arc.html#SP1" class="function-link"><span class="function-syntax">Architectures::is_16_bit</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">architecture</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">TargetVMs::debug_enabled</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">TargetVMs::debug_enabled</span></span>:<br/>Compatibility - <a href="2-cmp.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</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">VM</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 VM"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-arc.html#SP1" class="function-link"><span class="function-syntax">Architectures::debug_enabled</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">architecture</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">TargetVMs::supports_floating_point</span><span class="plain-syntax">(</span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</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">VM</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 VM"</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">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">supports_floating_point</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<ul class="endnotetexts"><li>The structure target_vm is accessed in 2/cmp and here.</li></ul>
<p class="commentary firstcommentary"><a id="SP2"></a><b>&#167;2. </b>The limits are different on each platform. On Z, the maximum is fixed
at 15, but Glulx allows it to be set with an I6 memory setting.
</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">TargetVMs::allow_this_many_locals</span><span class="plain-syntax">(</span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</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="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">VM</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 VM"</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">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">max_locals</span><span class="plain-syntax"> &gt;= </span><span class="constant-syntax">0</span><span class="plain-syntax">) &amp;&amp; (</span><span class="identifier-syntax">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">max_locals</span><span class="plain-syntax"> &lt; </span><span class="identifier-syntax">N</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">int</span><span class="plain-syntax"> </span><span class="function-syntax">TargetVMs::allow_MAX_LOCAL_VARIABLES</span><span class="plain-syntax">(</span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</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">VM</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 VM"</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">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">max_locals</span><span class="plain-syntax"> &gt; </span><span class="constant-syntax">15</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">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3"></a><b>&#167;3. </b>When releasing a blorbed story file, the file extension depends on the
story file wrapped inside. (This is a dubious idea, in the opinion of
the author of Inform &mdash; should not blorb be one unified wrapper? &mdash; but
interpreter writers disagree.)
</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">TargetVMs::get_unblorbed_extension</span><span class="plain-syntax">(</span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</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">VM</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 VM"</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">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">VM_unblorbed_extension</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">TargetVMs::get_blorbed_extension</span><span class="plain-syntax">(</span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</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">VM</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 VM"</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">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">VM_blorbed_extension</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
<span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="function-syntax">TargetVMs::get_iFiction_format</span><span class="plain-syntax">(</span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</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">VM</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 VM"</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">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">iFiction_format_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="function-syntax">TargetVMs::get_architecture</span><span class="plain-syntax">(</span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</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">VM</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 VM"</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">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">architecture</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP4"></a><b>&#167;4. </b>Different VMs have different in-browser interpreters, which means that
Inblorb needs to be given different release instructions for them. If the
user doesn't specify any particular interpreter, he gets:
</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">TargetVMs::get_default_interpreter</span><span class="plain-syntax">(</span><span class="reserved-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</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">VM</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 VM"</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">VM</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">default_browser_interpreter</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
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