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ut type='hidden' name='id' value='eaeb955212eb3b133fd98d98457f17bfea8891d1'/> Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.Kartik K. Agaram <vc@akkartik.com>
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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><span class="Delimiter">,</span> <span class="Constant">2</span>
]
<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>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
recipe f [
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Constant">5</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
<span class="traceContains">+run: f</span>
<span class="Comment"># running f</span>
<span class="traceContains">+run: 4:number &lt;- copy 0</span>
<span class="traceContains">+run: 5:number &lt;- copy 0</span>
<span class="Comment"># back out to main</span>
<span class="traceContains">+run: 1:number &lt;- copy 0</span>
<span class="traceContains">+run: 2:number &lt;- copy 0</span>
<span class="traceContains">+run: 3:number &lt;- copy 0</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>
<span class="Normal">struct</span> call <span class="Delimiter">{</span>
  recipe_ordinal running_recipe<span class="Delimiter">;</span>
  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> 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>
<span class="Normal">typedef</span> list&lt;call&gt; call_stack<span class="Delimiter">;</span>

<span class="Delimiter">:(replace{} &quot;struct routine&quot;)</span>
<span class="Normal">struct</span> 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>
  <span class="Normal">bool</span> completed<span class="Delimiter">()</span> <span class="Normal">const</span><span class="Delimiter">;</span>
  <span class="Normal">const</span> vector&lt;instruction&gt;&amp; steps<span class="Delimiter">()</span> <span class="Normal">const</span><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>
<span class="Normal">inline</span> <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>&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>
<span class="Normal">inline</span> <span class="Normal">const</span> 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>
<span class="Normal">inline</span> <span class="Normal">const</span> 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>
<span class="Normal">default</span>: <span class="Delimiter">{</span>
  <span class="Comment">// not a primitive; try to look up the book of recipes</span>
  <span class="Normal">if</span> <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; current_recipe_name<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;: undefined operation in '&quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Comment">// stop running this instruction immediately</span>
    ++current_step_index<span class="Delimiter">();</span>
    <span class="Identifier">continue</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>
  <span class="Normal">call_housekeeping</span>:
  ++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="Delimiter">:(scenario calling_undefined_recipe_warns)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
  foo
]
<span class="traceContains">+warn: main: undefined operation in 'foo '</span>

<span class="Delimiter">:(scenario calling_undefined_recipe_handles_missing_result)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
  <span class="Normal">x</span>:number<span class="Special"> &lt;- </span>foo
]
<span class="traceContains">+warn: main: undefined operation in 'x:number &lt;- foo '</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>
<span class="Normal">inline</span> <span class="Normal">bool</span> routine::completed<span class="Delimiter">()</span> <span class="Normal">const</span> <span class="Delimiter">{</span>
  <span class="Identifier">return</span> calls<span class="Delimiter">.</span>empty<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

<span class="Normal">inline</span> <span class="Normal">const</span> vector&lt;instruction&gt;&amp; routine::steps<span class="Delimiter">()</span> <span class="Normal">const</span> <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>
<span class="Normal">while</span> <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; SIZE(Current_routine-&gt;calls) &lt;&lt; '\n'; //? 2</span>
  Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>pop_front<span class="Delimiter">();</span>
  <span class="Normal">if</span> <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 products 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>
<span class="Normal">using</span> std::stack<span class="Delimiter">;</span>
</pre>
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