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authorKartik K. Agaram <vc@akkartik.com>2015-07-13 20:53:41 -0700
committerKartik K. Agaram <vc@akkartik.com>2015-07-13 20:53:41 -0700
commit83fcebf3210b638d9f8248e0007e9f0c9804980a (patch)
tree95c4855bef341e1d46eb4725b54a3eaaf6858f08 /html/047global.cc.html
parent8b9f1750c74c7d3cca99d6949a90cd61eb8e0218 (diff)
downloadmu-83fcebf3210b638d9f8248e0007e9f0c9804980a.tar.gz
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+<pre id='vimCodeElement'>
+<span class="Comment">// So far we have local variables, and we can nest local variables of short</span>
+<span class="Comment">// lifetimes inside longer ones. Now let's support 'global' variables that</span>
+<span class="Comment">// last for the life of a routine. If we create multiple routines they won't</span>
+<span class="Comment">// have access to each other's globals.</span>
+
+<span class="Delimiter">:(scenario global_space)</span>
+recipe main [
+  <span class="Comment"># pretend arrays; in practice we'll use new</span>
+  <span class="Constant">10</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">5</span>:literal
+  <span class="Constant">20</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">5</span>:literal
+  <span class="Comment"># actual start of this recipe</span>
+  global-space:address:array:location<span class="Special"> &lt;- </span>copy <span class="Constant">20</span>:literal
+  default-space:address:array:location<span class="Special"> &lt;- </span>copy <span class="Constant">10</span>:literal
+  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">23</span>:literal
+  <span class="Constant">1</span>:number/space:global<span class="Special"> &lt;- </span>copy <span class="Constant">24</span>:literal
+]
+<span class="traceContains">+mem: storing 23 in location 12</span>
+<span class="traceContains">+mem: storing 24 in location 22</span>
+
+<span class="Comment">//: to support it, create another special variable called global space</span>
+<span class="Delimiter">:(before &quot;End Disqualified Reagents&quot;)</span>
+if <span class="Delimiter">(</span>x<span class="Delimiter">.</span>name == <span class="Constant">&quot;global-space&quot;</span><span class="Delimiter">)</span>
+  x<span class="Delimiter">.</span>initialized = <span class="Constant">true</span><span class="Delimiter">;</span>
+<span class="Delimiter">:(before &quot;End is_special_name Cases&quot;)</span>
+if <span class="Delimiter">(</span>s == <span class="Constant">&quot;global-space&quot;</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+
+<span class="Comment">//: writes to this variable go to a field in the current routine</span>
+<span class="Delimiter">:(before &quot;End routine Fields&quot;)</span>
+long long int global_space<span class="Delimiter">;</span>
+<span class="Delimiter">:(before &quot;End routine Constructor&quot;)</span>
+global_space = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span class="Delimiter">:(after &quot;void write_memory(reagent x, vector&lt;double&gt; data)&quot;)</span>
+  if <span class="Delimiter">(</span>x<span class="Delimiter">.</span>name == <span class="Constant">&quot;global-space&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>data<span class="Delimiter">));</span>
+    if <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>global_space<span class="Delimiter">)</span>
+      raise &lt;&lt; <span class="Constant">&quot;routine already has a global-space; you can't over-write your globals&quot;</span><span class="Delimiter">;</span>
+    Current_routine<span class="Delimiter">-&gt;</span>global_space = data<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+    <span class="Identifier">return</span><span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+
+<span class="Comment">//: now marking variables as /space:global looks them up inside this field</span>
+<span class="Delimiter">:(after &quot;long long int space_base(const reagent&amp; x)&quot;)</span>
+  if <span class="Delimiter">(</span>is_global<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+    if <span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-&gt;</span>global_space<span class="Delimiter">)</span>
+      raise &lt;&lt; <span class="Constant">&quot;routine has no global space</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; die<span class="Delimiter">();</span>
+    <span class="Identifier">return</span> Current_routine<span class="Delimiter">-&gt;</span>global_space<span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+
+<span class="Comment">//: for now let's not bother giving global variables names.</span>
+<span class="Comment">//: don't want to make them too comfortable to use.</span>
+
+<span class="Delimiter">:(scenario global_space_with_names)</span>
+<span class="Special">% Hide_warnings = true;</span>
+recipe main [
+  global-space:address:array:location<span class="Special"> &lt;- </span>new location:type<span class="Delimiter">,</span> <span class="Constant">10</span>:literal
+  x:number<span class="Special"> &lt;- </span>copy <span class="Constant">23</span>:literal
+  <span class="Constant">1</span>:number/space:global<span class="Special"> &lt;- </span>copy <span class="Constant">24</span>:literal
+]
+<span class="Comment"># don't warn that we're mixing numeric addresses and names</span>
+$warn: <span class="Constant">0</span>
+
+<span class="Delimiter">:(after &quot;bool is_numeric_location(const reagent&amp; x)&quot;)</span>
+  if <span class="Delimiter">(</span>is_global<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+
+<span class="Comment">//: helpers</span>
+
+<span class="Delimiter">:(code)</span>
+bool is_global<span class="Delimiter">(</span>const reagent&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span class="CommentedCode">//?   cerr &lt;&lt; x.to_string() &lt;&lt; '\n'; //? 1</span>
+  for <span class="Delimiter">(</span>long long int i = <span class="Comment">/*</span><span class="Comment">skip name:type</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    if <span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first == <span class="Constant">&quot;space&quot;</span><span class="Delimiter">)</span>
+      <span class="Identifier">return</span> !x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == <span class="Constant">&quot;global&quot;</span><span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+</pre>
+</body>
+</html>
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