html/048call_variable.cc.html


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<pre id='vimCodeElement'>
<span class="Comment">//: push a variable recipe on the call stack</span>

<span class="Delimiter">:(scenario call_literal_recipe)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>call f:recipe<span class="Delimiter">,</span> <span class="Constant">34</span>:literal
]
recipe f [
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>next-ingredient
  reply <span class="Constant">2</span>:number
]
<span class="traceContains">+mem: storing 34 in location 1</span>

<span class="Delimiter">:(scenario call_variable)</span>
recipe main [
  <span class="Constant">1</span>:number/recipe<span class="Special"> &lt;- </span>copy <span class="Constant">1001</span>:literal/f  <span class="Comment"># hack: assumes tests start recipes at 1000</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>call <span class="Constant">1</span>:number/recipe<span class="Delimiter">,</span> <span class="Constant">34</span>:literal
]
recipe f [  <span class="Comment"># recipe 1001</span>
  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>next-ingredient
  reply <span class="Constant">3</span>:number
]
<span class="traceContains">+mem: storing 34 in location 2</span>
<span class="CommentedCode">#? ?</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
CALL<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
Recipe_number[<span class="Constant">&quot;call&quot;</span>] = CALL<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
case CALL: <span class="Delimiter">{</span>
  recipe_number r = <span class="Constant">0</span><span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>initialized<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
    <span class="Comment">// 'call' received an integer recipe_number</span>
    r = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
  <span class="Delimiter">}</span>
  else <span class="Delimiter">{</span>
    <span class="Comment">// 'call' received a literal recipe name</span>
    r = Recipe_number[current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name]<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>r<span class="Delimiter">));</span>
  ingredients<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">());</span>  <span class="Comment">// drop the callee</span>
  <span class="Identifier">goto</span> complete_call<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
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