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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"> <- </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"> <- </span>copy <span class="Constant">0</span>:literal
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>:literal
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>:literal
]
recipe f [
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>:literal
<span class="Constant">5</span>:number<span class="Special"> <- </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 <- copy 0:literal</span>
<span class="traceContains">+run: 5:number <- copy 0:literal</span>
<span class="Comment"># back out to main</span>
<span class="traceContains">+run: 1:number <- copy 0:literal</span>
<span class="traceContains">+run: 2:number <- copy 0:literal</span>
<span class="traceContains">+run: 3:number <- copy 0:literal</span>
<span class="Delimiter">:(before "struct routine {")</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<call> call_stack<span class="Delimiter">;</span>
<span class="Delimiter">:(replace{} "struct routine")</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<instruction>& 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{} "inline long long int& current_step_index()")</span>
<span class="Normal">inline</span> <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>& current_step_index<span class="Delimiter">()</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
<span class="Identifier">return</span> Current_routine<span class="Delimiter">-></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{} "inline const string& current_recipe_name()")</span>
<span class="Normal">inline</span> <span class="Normal">const</span> string& current_recipe_name<span class="Delimiter">()</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
<span class="Identifier">return</span> Recipe[Current_routine<span class="Delimiter">-></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{} "inline const instruction& current_instruction()")</span>
<span class="Normal">inline</span> <span class="Normal">const</span> instruction& current_instruction<span class="Delimiter">()</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
<span class="Identifier">return</span> Recipe[Current_routine<span class="Delimiter">-></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">-></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{} "default:" following "End Primitive Recipe Implementations")</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 << <span class="Constant">"undefined operation "</span> << current_instruction<span class="Delimiter">().</span>operation << <span class="Constant">": "</span> << current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
Current_routine<span class="Delimiter">-></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 < <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{} "inline bool routine::completed() const")</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<instruction>& 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 "Running One Instruction")</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> >= SIZE<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></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 << "reply " << SIZE(Current_routine->calls) << '\n'; //? 2</span>
Current_routine<span class="Delimiter">-></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">-></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 "End Includes")</span>
<span class="PreProc">#include </span><span class="Constant"><stack></span>
<span class="Normal">using</span> std::stack<span class="Delimiter">;</span>
</pre>
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