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<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>
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