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<ul class="crumbs"><li><a href="../webs.html">Source</a></li><li><a href="../compiler.html">Compiler 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><p class="purpose">To deal with multiple inter architectures.</p>
<ul class="toc"><li><a href="#SP1">&#167;1. Architectures</a></li></ul><hr class="tocbar">
<p class="inwebparagraph"><a id="SP1"></a><b>&#167;1. Architectures. </b></p>
<pre class="display">
<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">struct</span><span class="plain"> </span><span class="reserved">target_vm</span><span class="plain"> {</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">family_name</span><span class="plain">; </span> <span class="comment">such as <code class="display"><span class="extract">Glulx</span></code></span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">with_debugging_enabled</span><span class="plain">;</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">inter_architecture</span><span class="plain"> *</span><span class="identifier">architecture</span><span class="plain">; </span> <span class="comment">such as 32d</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="identifier">semantic_version_number</span><span class="plain"> </span><span class="identifier">version</span><span class="plain">; </span> <span class="comment">such as 0.8.7</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">VM_extension</span><span class="plain">; </span> <span class="comment">canonical filename extension</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">VM_unblorbed_extension</span><span class="plain">; </span> <span class="comment">such as <code class="display"><span class="extract">z8</span></code></span>
<span class="reserved">struct</span><span class="plain"> </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">VM_blorbed_extension</span><span class="plain">; </span> <span class="comment">when blorbed up</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">VM_image</span><span class="plain">; </span> <span class="comment">filename of image for icon denoting VM</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">max_locals</span><span class="plain">; </span> <span class="comment">upper limit on local variables per stack frame</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">default_browser_interpreter</span><span class="plain">; </span> <span class="comment">e.g., "Parchment"</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">iFiction_format_name</span><span class="plain">; </span> <span class="comment">e.g., "zcode": see the Treaty of Babel</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">supports_floating_point</span><span class="plain">;</span>
<span class="identifier">MEMORY_MANAGEMENT</span>
<span class="plain">} </span><span class="reserved">target_vm</span><span class="plain">;</span>
<span class="reserved">target_vm</span><span class="plain"> *</span><span class="functiontext">TargetVMs::new</span><span class="plain">(</span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">code</span><span class="plain">, </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">nick</span><span class="plain">, </span><span class="identifier">semantic_version_number</span><span class="plain"> </span><span class="identifier">V</span><span class="plain">,</span>
<span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">image</span><span class="plain">, </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">interpreter</span><span class="plain">, </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">blorbed</span><span class="plain">, </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">arch</span><span class="plain">,</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">debug</span><span class="plain">, </span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">max_locals</span><span class="plain">, </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">iFiction</span><span class="plain">) {</span>
<span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">VM</span><span class="plain"> = </span><span class="identifier">CREATE</span><span class="plain">(</span><span class="reserved">target_vm</span><span class="plain">);</span>
<span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;family_name</span><span class="plain"> = </span><span class="identifier">Str::duplicate</span><span class="plain">(</span><span class="identifier">code</span><span class="plain">);</span>
<span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;version</span><span class="plain"> = </span><span class="identifier">V</span><span class="plain">;</span>
<span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;VM_extension</span><span class="plain"> = </span><span class="identifier">Str::duplicate</span><span class="plain">(</span><span class="identifier">nick</span><span class="plain">);</span>
<span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;VM_unblorbed_extension</span><span class="plain"> = </span><span class="identifier">Str::duplicate</span><span class="plain">(</span><span class="identifier">nick</span><span class="plain">);</span>
<span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;VM_blorbed_extension</span><span class="plain"> = </span><span class="identifier">Str::duplicate</span><span class="plain">(</span><span class="identifier">blorbed</span><span class="plain">);</span>
<span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;VM_image</span><span class="plain"> = </span><span class="identifier">Str::duplicate</span><span class="plain">(</span><span class="identifier">image</span><span class="plain">);</span>
<span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;max_locals</span><span class="plain"> = </span><span class="identifier">max_locals</span><span class="plain">;</span>
<span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;default_browser_interpreter</span><span class="plain"> = </span><span class="identifier">Str::duplicate</span><span class="plain">(</span><span class="identifier">interpreter</span><span class="plain">);</span>
<span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;architecture</span><span class="plain"> = </span><span class="functiontext">Architectures::from_codename</span><span class="plain">(</span><span class="identifier">arch</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;architecture</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 such architecture"</span><span class="plain">);</span>
<span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;with_debugging_enabled</span><span class="plain"> = </span><span class="identifier">debug</span><span class="plain">;</span>
<span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;supports_floating_point</span><span class="plain"> = </span><span class="identifier">TRUE</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext">Architectures::is_16_bit</span><span class="plain">(</span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;architecture</span><span class="plain">)) </span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;supports_floating_point</span><span class="plain"> = </span><span class="identifier">FALSE</span><span class="plain">;</span>
<span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;iFiction_format_name</span><span class="plain"> = </span><span class="identifier">Str::duplicate</span><span class="plain">(</span><span class="identifier">iFiction</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">VM</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">TargetVMs::write</span><span class="plain">(</span><span class="identifier">OUTPUT_STREAM</span><span class="plain">, </span><span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">VM</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VM</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"none"</span><span class="plain">);</span>
<span class="reserved">else</span><span class="plain"> {</span>
<span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"%S"</span><span class="plain">, </span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;family_name</span><span class="plain">);</span>
<span class="identifier">semantic_version_number</span><span class="plain"> </span><span class="identifier">V</span><span class="plain"> = </span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;version</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VersionNumbers::is_null</span><span class="plain">(</span><span class="identifier">V</span><span class="plain">) == </span><span class="identifier">FALSE</span><span class="plain">) </span><span class="identifier">WRITE</span><span class="plain">(</span><span class="string">" version %v"</span><span class="plain">, &amp;</span><span class="identifier">V</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;with_debugging_enabled</span><span class="plain">) </span><span class="identifier">WRITE</span><span class="plain">(</span><span class="string">" with debugging"</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">TargetVMs::create</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
<span class="comment">hat tip: Joel Berez and Marc Blank, 1979, and later hands</span>
<span class="functiontext">TargetVMs::new</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"Z-Machine"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"z5"</span><span class="plain">, </span><span class="identifier">VersionNumbers::from_text</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"5"</span><span class="plain">),</span>
<span class="identifier">I</span><span class="string">"vm_z5.png"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"Parchment"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"zblorb"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"16"</span><span class="plain">, </span><span class="identifier">FALSE</span><span class="plain">, 15, </span><span class="identifier">I</span><span class="string">"zcode"</span><span class="plain">);</span>
<span class="functiontext">TargetVMs::new</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"Z-Machine"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"z5"</span><span class="plain">, </span><span class="identifier">VersionNumbers::from_text</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"5"</span><span class="plain">),</span>
<span class="identifier">I</span><span class="string">"vm_z5.png"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"Parchment"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"zblorb"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"16d"</span><span class="plain">, </span><span class="identifier">TRUE</span><span class="plain">, 15, </span><span class="identifier">I</span><span class="string">"zcode"</span><span class="plain">);</span>
<span class="functiontext">TargetVMs::new</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"Z-Machine"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"z8"</span><span class="plain">, </span><span class="identifier">VersionNumbers::from_text</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"8"</span><span class="plain">),</span>
<span class="identifier">I</span><span class="string">"vm_z8.png"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"Parchment"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"zblorb"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"16"</span><span class="plain">, </span><span class="identifier">FALSE</span><span class="plain">, 15, </span><span class="identifier">I</span><span class="string">"zcode"</span><span class="plain">);</span>
<span class="functiontext">TargetVMs::new</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"Z-Machine"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"z8"</span><span class="plain">, </span><span class="identifier">VersionNumbers::from_text</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"8"</span><span class="plain">),</span>
<span class="identifier">I</span><span class="string">"vm_z8.png"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"Parchment"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"zblorb"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"16d"</span><span class="plain">, </span><span class="identifier">TRUE</span><span class="plain">, 15, </span><span class="identifier">I</span><span class="string">"zcode"</span><span class="plain">);</span>
<span class="comment">hat tip: Andrew Plotkin, 2000</span>
<span class="functiontext">TargetVMs::new</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"Glulx"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"ulx"</span><span class="plain">, </span><span class="identifier">VersionNumbers::from_text</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"3.1.2"</span><span class="plain">),</span>
<span class="identifier">I</span><span class="string">"vm_glulx.png"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"Quixe"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"gblorb"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"32"</span><span class="plain">, </span><span class="identifier">FALSE</span><span class="plain">, 256, </span><span class="identifier">I</span><span class="string">"glulx"</span><span class="plain">);</span>
<span class="functiontext">TargetVMs::new</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"Glulx"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"ulx"</span><span class="plain">, </span><span class="identifier">VersionNumbers::from_text</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"3.1.2"</span><span class="plain">),</span>
<span class="identifier">I</span><span class="string">"vm_glulx.png"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"Quixe"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"gblorb"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"32d"</span><span class="plain">, </span><span class="identifier">TRUE</span><span class="plain">, 256, </span><span class="identifier">I</span><span class="string">"glulx"</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">target_vm</span><span class="plain"> *</span><span class="functiontext">TargetVMs::find</span><span class="plain">(</span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">ext</span><span class="plain">, </span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">debug</span><span class="plain">) {</span>
<span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">result</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Str::len</span><span class="plain">(</span><span class="identifier">ext</span><span class="plain">) == 0) </span><span class="identifier">ext</span><span class="plain"> = </span><span class="identifier">I</span><span class="string">"ulx"</span><span class="plain">;</span>
<span class="identifier">TEMPORARY_TEXT</span><span class="plain">(</span><span class="identifier">file_extension</span><span class="plain">);</span>
<span class="identifier">Str::copy</span><span class="plain">(</span><span class="identifier">file_extension</span><span class="plain">, </span><span class="identifier">ext</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Str::get_first_char</span><span class="plain">(</span><span class="identifier">file_extension</span><span class="plain">) == </span><span class="character">'.'</span><span class="plain">) </span><span class="identifier">Str::delete_first_character</span><span class="plain">(</span><span class="identifier">file_extension</span><span class="plain">);</span>
<span class="identifier">LOOP_THROUGH_TEXT</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">, </span><span class="identifier">file_extension</span><span class="plain">)</span>
<span class="identifier">Str::put</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">, </span><span class="identifier">Characters::tolower</span><span class="plain">(</span><span class="identifier">Str::get</span><span class="plain">(</span><span class="identifier">pos</span><span class="plain">)));</span>
<span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">VM</span><span class="plain">;</span>
<span class="identifier">LOOP_OVER</span><span class="plain">(</span><span class="identifier">VM</span><span class="plain">, </span><span class="reserved">target_vm</span><span class="plain">)</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">Str::eq_insensitive</span><span class="plain">(</span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;VM_unblorbed_extension</span><span class="plain">, </span><span class="identifier">ext</span><span class="plain">)) &amp;&amp;</span>
<span class="plain">(</span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;with_debugging_enabled</span><span class="plain"> == </span><span class="identifier">debug</span><span class="plain">))</span>
<span class="identifier">result</span><span class="plain"> = </span><span class="identifier">VM</span><span class="plain">;</span>
<span class="identifier">DISCARD_TEXT</span><span class="plain">(</span><span class="identifier">file_extension</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">result</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">target_vm</span><span class="plain"> *</span><span class="functiontext">TargetVMs::find_in_family</span><span class="plain">(</span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">family</span><span class="plain">, </span><span class="identifier">semantic_version_number</span><span class="plain"> </span><span class="identifier">V</span><span class="plain">, </span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">debug</span><span class="plain">) {</span>
<span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">VM</span><span class="plain">;</span>
<span class="identifier">LOOP_OVER</span><span class="plain">(</span><span class="identifier">VM</span><span class="plain">, </span><span class="reserved">target_vm</span><span class="plain">)</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">Str::eq_insensitive</span><span class="plain">(</span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;family_name</span><span class="plain">, </span><span class="identifier">family</span><span class="plain">)) &amp;&amp;</span>
<span class="plain">(</span><span class="identifier">VersionNumbers::eq</span><span class="plain">(</span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;version</span><span class="plain">, </span><span class="identifier">V</span><span class="plain">)) &amp;&amp;</span>
<span class="plain">((</span><span class="identifier">debug</span><span class="plain"> == </span><span class="identifier">NOT_APPLICABLE</span><span class="plain">) || (</span><span class="identifier">debug</span><span class="plain"> == </span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;with_debugging_enabled</span><span class="plain">)))</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">VM</span><span class="plain">;</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">TargetVMs::is_16_bit</span><span class="plain">(</span><span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">VM</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VM</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 VM"</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Architectures::is_16_bit</span><span class="plain">(</span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;architecture</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">TargetVMs::debug_enabled</span><span class="plain">(</span><span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">VM</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VM</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 VM"</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="functiontext">Architectures::debug_enabled</span><span class="plain">(</span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;architecture</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">TargetVMs::supports_floating_point</span><span class="plain">(</span><span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">VM</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VM</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 VM"</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;supports_floating_point</span><span class="plain">;</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The function TargetVMs::new appears nowhere else.</p>
<p class="endnote">The function TargetVMs::write is used in 2/cmp (<a href="2-cmp.html#SP1">&#167;1</a>).</p>
<p class="endnote">The function TargetVMs::create is used in 1/am (<a href="1-am.html#SP3">&#167;3</a>).</p>
<p class="endnote">The function TargetVMs::find appears nowhere else.</p>
<p class="endnote">The function TargetVMs::find_in_family appears nowhere else.</p>
<p class="endnote">The function TargetVMs::is_16_bit is used in 2/cmp (<a href="2-cmp.html#SP1">&#167;1</a>).</p>
<p class="endnote">The function TargetVMs::debug_enabled is used in 2/cmp (<a href="2-cmp.html#SP1">&#167;1</a>).</p>
<p class="endnote">The function TargetVMs::supports_floating_point appears nowhere else.</p>
<p class="endnote">The structure target_vm is accessed in 2/cmp and here.</p>
<p class="inwebparagraph"><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="display">
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">TargetVMs::allow_this_many_locals</span><span class="plain">(</span><span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">VM</span><span class="plain">, </span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">N</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VM</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 VM"</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;max_locals</span><span class="plain"> &gt;= 0) &amp;&amp; (</span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;max_locals</span><span class="plain"> &lt; </span><span class="identifier">N</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="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">TargetVMs::allow_MAX_LOCAL_VARIABLES</span><span class="plain">(</span><span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">VM</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VM</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 VM"</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;max_locals</span><span class="plain"> &gt; 15) </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>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The function TargetVMs::allow_this_many_locals appears nowhere else.</p>
<p class="endnote">The function TargetVMs::allow_MAX_LOCAL_VARIABLES appears nowhere else.</p>
<p class="inwebparagraph"><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="display">
<span class="identifier">text_stream</span><span class="plain"> *</span><span class="functiontext">TargetVMs::get_unblorbed_extension</span><span class="plain">(</span><span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">VM</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VM</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 VM"</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;VM_unblorbed_extension</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="identifier">text_stream</span><span class="plain"> *</span><span class="functiontext">TargetVMs::get_blorbed_extension</span><span class="plain">(</span><span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">VM</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VM</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 VM"</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;VM_blorbed_extension</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="identifier">text_stream</span><span class="plain"> *</span><span class="functiontext">TargetVMs::get_iFiction_format</span><span class="plain">(</span><span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">VM</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VM</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 VM"</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;iFiction_format_name</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">inter_architecture</span><span class="plain"> *</span><span class="functiontext">TargetVMs::get_architecture</span><span class="plain">(</span><span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">VM</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VM</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 VM"</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;architecture</span><span class="plain">;</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The function TargetVMs::get_unblorbed_extension appears nowhere else.</p>
<p class="endnote">The function TargetVMs::get_blorbed_extension appears nowhere else.</p>
<p class="endnote">The function TargetVMs::get_iFiction_format appears nowhere else.</p>
<p class="endnote">The function TargetVMs::get_architecture appears nowhere else.</p>
<p class="inwebparagraph"><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="display">
<span class="identifier">text_stream</span><span class="plain"> *</span><span class="functiontext">TargetVMs::get_default_interpreter</span><span class="plain">(</span><span class="reserved">target_vm</span><span class="plain"> *</span><span class="identifier">VM</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">VM</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 VM"</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">VM</span><span class="plain">-</span><span class="element">&gt;default_browser_interpreter</span><span class="plain">;</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The function TargetVMs::get_default_interpreter appears nowhere else.</p>
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