1766

author: Kartik K. Agaram <vc@akkartik.com> 2015-07-12 00:11:56 -0700
committer: Kartik K. Agaram <vc@akkartik.com> 2015-07-12 00:11:56 -0700
commit: d5d908dda655c791329563522faad42d7e4ee618 (patch)
tree: 628b8a23e13878c45ef39dfbffb860c676da5304 /html/034call.cc.html
parent: 9864bdd0792b697d7b03e692ba7f82cf5669c41c (diff)
download: mu-d5d908dda655c791329563522faad42d7e4ee618.tar.gz
1 files changed, 162 insertions, 0 deletions
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+<pre id='vimCodeElement'>
+<span class="Comment">//: So far the recipes we define can't run each other. Let's fix that.</span>
+
+<span class="Delimiter">:(scenario calling_recipe)</span>
+recipe main [
+  f
+]
+recipe f [
+  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>add <span class="Constant">2</span>:literal<span class="Delimiter">,</span> <span class="Constant">2</span>:literal
+]
+<span class="traceContains">+mem: storing 4 in location 3</span>
+
+<span class="Delimiter">:(scenario return_on_fallthrough)</span>
+recipe main [
+  f
+  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>:literal
+  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>:literal
+  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>:literal
+]
+recipe f [
+  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>:literal
+  <span class="Constant">5</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>:literal
+]
+<span class="traceContains">+run: f</span>
+<span class="Comment"># running f</span>
+<span class="traceContains">+run: 4:number &lt;- copy 0:literal</span>
+<span class="traceContains">+run: 5:number &lt;- copy 0:literal</span>
+<span class="Comment"># back out to main</span>
+<span class="traceContains">+run: 1:number &lt;- copy 0:literal</span>
+<span class="traceContains">+run: 2:number &lt;- copy 0:literal</span>
+<span class="traceContains">+run: 3:number &lt;- copy 0:literal</span>
+
+<span class="Delimiter">:(before &quot;struct routine {&quot;)</span>
+<span class="Comment">// Everytime a recipe runs another, we interrupt it and start running the new</span>
+<span class="Comment">// recipe. When that finishes, we continue this one where we left off.</span>
+<span class="Comment">// This requires maintaining a 'stack' of interrupted recipes or 'calls'.</span>
+struct call <span class="Delimiter">{</span>
+  recipe_ordinal running_recipe<span class="Delimiter">;</span>
+  long long int running_step_index<span class="Delimiter">;</span>
+  <span class="Comment">// End call Fields</span>
+  call<span class="Delimiter">(</span>recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    running_recipe = r<span class="Delimiter">;</span>
+    running_step_index = <span class="Constant">0</span><span class="Delimiter">;</span>
+    <span class="Comment">// End call Constructor</span>
+  <span class="Delimiter">}</span>
+<span class="Delimiter">};</span>
+typedef list&lt;call&gt; call_stack<span class="Delimiter">;</span>
+
+<span class="Delimiter">:(replace{} &quot;struct routine&quot;)</span>
+struct routine <span class="Delimiter">{</span>
+  call_stack calls<span class="Delimiter">;</span>
+  <span class="Comment">// End routine Fields</span>
+  routine<span class="Delimiter">(</span>recipe_ordinal r<span class="Delimiter">);</span>
+  bool completed<span class="Delimiter">()</span> const<span class="Delimiter">;</span>
+  const vector&lt;instruction&gt;&amp; steps<span class="Delimiter">()</span> const<span class="Delimiter">;</span>
+<span class="Delimiter">};</span>
+<span class="Delimiter">:(code)</span>
+routine::routine<span class="Delimiter">(</span>recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  calls<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>call<span class="Delimiter">(</span>r<span class="Delimiter">));</span>
+  <span class="Comment">// End routine Constructor</span>
+<span class="Delimiter">}</span>
+
+<span class="SalientComment">//:: now update routine's helpers</span>
+
+<span class="Delimiter">:(replace{} &quot;inline long long int&amp; current_step_index()&quot;)</span>
+inline long long int&amp; current_step_index<span class="Delimiter">()</span> <span class="Delimiter">{</span>
+  assert<span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
+  <span class="Identifier">return</span> Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_step_index<span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+<span class="Delimiter">:(replace{} &quot;inline const string&amp; current_recipe_name()&quot;)</span>
+inline const string&amp; current_recipe_name<span class="Delimiter">()</span> <span class="Delimiter">{</span>
+  assert<span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
+  <span class="Identifier">return</span> Recipe[Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_recipe]<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+<span class="Delimiter">:(replace{} &quot;inline const instruction&amp; current_instruction()&quot;)</span>
+inline const instruction&amp; current_instruction<span class="Delimiter">()</span> <span class="Delimiter">{</span>
+  assert<span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
+  <span class="Identifier">return</span> Recipe[Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_recipe]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_step_index<span class="Delimiter">);</span>
+<span class="Delimiter">}</span>
+
+<span class="Delimiter">:(replace{} &quot;default:&quot; following &quot;End Primitive Recipe Implementations&quot;)</span>
+default: <span class="Delimiter">{</span>
+  <span class="Comment">// not a primitive; try to look up the book of recipes</span>
+  if <span class="Delimiter">(</span>Recipe<span class="Delimiter">.</span>find<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>operation<span class="Delimiter">)</span> == Recipe<span class="Delimiter">.</span>end<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+    raise &lt;&lt; <span class="Constant">&quot;undefined operation &quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>operation &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+    <span class="Identifier">break</span><span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+  Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>call<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>operation<span class="Delimiter">));</span>
+complete_call:
+  ++Callstack_depth<span class="Delimiter">;</span>
+  assert<span class="Delimiter">(</span>Callstack_depth &lt; <span class="Constant">9000</span><span class="Delimiter">);</span>  <span class="Comment">// 9998-101 plus cushion</span>
+  <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// not done with caller; don't increment current_step_index()</span>
+<span class="Delimiter">}</span>
+
+<span class="SalientComment">//:: finally, we need to fix the termination conditions for the run loop</span>
+
+<span class="Delimiter">:(replace{} &quot;inline bool routine::completed() const&quot;)</span>
+inline bool routine::completed<span class="Delimiter">()</span> const <span class="Delimiter">{</span>
+  <span class="Identifier">return</span> calls<span class="Delimiter">.</span>empty<span class="Delimiter">();</span>
+<span class="Delimiter">}</span>
+
+inline const vector&lt;instruction&gt;&amp; routine::steps<span class="Delimiter">()</span> const <span class="Delimiter">{</span>
+  assert<span class="Delimiter">(</span>!calls<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
+  <span class="Identifier">return</span> Recipe[calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_recipe]<span class="Delimiter">.</span>steps<span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+
+<span class="Delimiter">:(before &quot;Running One Instruction&quot;)</span>
+<span class="Comment">// when we reach the end of one call, we may reach the end of the one below</span>
+<span class="Comment">// it, and the one below that, and so on</span>
+while <span class="Delimiter">(</span>current_step_index<span class="Delimiter">()</span> &gt;= SIZE<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>steps<span class="Delimiter">()))</span> <span class="Delimiter">{</span>
+  <span class="Comment">// Falling Through End Of Recipe</span>
+  --Callstack_depth<span class="Delimiter">;</span>
+<span class="CommentedCode">//?   cerr &lt;&lt; &quot;reply &quot; &lt;&lt; Current_routine-&gt;calls.size() &lt;&lt; '\n'; //? 2</span>
+  Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>pop_front<span class="Delimiter">();</span>
+  if <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+  <span class="Comment">// Complete Call Fallthrough</span>
+  <span class="Comment">// todo: no results returned warning</span>
+  ++current_step_index<span class="Delimiter">();</span>
+<span class="Delimiter">}</span>
+
+<span class="Delimiter">:(before &quot;End Includes&quot;)</span>
+<span class="PreProc">#include </span><span class="Constant">&lt;stack&gt;</span>
+using std::stack<span class="Delimiter">;</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
author	Kartik K. Agaram <vc@akkartik.com>	2015-07-12 00:11:56 -0700
committer	Kartik K. Agaram <vc@akkartik.com>	2015-07-12 00:11:56 -0700
commit	d5d908dda655c791329563522faad42d7e4ee618 (patch)
tree	628b8a23e13878c45ef39dfbffb860c676da5304 /html/034call.cc.html
parent	9864bdd0792b697d7b03e692ba7f82cf5669c41c (diff)
download	mu-d5d908dda655c791329563522faad42d7e4ee618.tar.gz