html/047jump_label.cc.html


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<pre id='vimCodeElement'>
<span class="Comment">//: Support jumps to labels.</span>
<span class="Comment">//: We'll also treat 'break' and 'continue' as jumps. The choice of name is</span>
<span class="Comment">//: just documentation about intent.</span>

<span class="Delimiter">:(scenario jump_to_label)</span>
recipe main [
  jump +target:offset
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>:literal
  +target
]
<span class="traceAbsent">-mem: storing 0 in location 1</span>

<span class="Delimiter">:(after &quot;int main&quot;)</span>
  Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>transform_labels<span class="Delimiter">);</span>

<span class="Delimiter">:(code)</span>
void transform_labels<span class="Delimiter">(</span>const recipe_number r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  map&lt;string<span class="Delimiter">,</span> index_t&gt; offset<span class="Delimiter">;</span>
  for <span class="Delimiter">(</span>index_t i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>size<span class="Delimiter">();</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    const instruction&amp; inst = Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
    if <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>label<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> offset[inst<span class="Delimiter">.</span>label] = i<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  for <span class="Delimiter">(</span>index_t i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>size<span class="Delimiter">();</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    instruction&amp; inst = Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
    if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation == Recipe_number[<span class="Constant">&quot;jump&quot;</span>]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//?       cerr &lt;&lt; inst.to_string() &lt;&lt; '\n'; //? 1</span>
      replace_offset<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
    if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation == Recipe_number[<span class="Constant">&quot;jump-if&quot;</span>] || inst<span class="Delimiter">.</span>operation == Recipe_number[<span class="Constant">&quot;jump-unless&quot;</span>]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      replace_offset<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
    if <span class="Delimiter">((</span>inst<span class="Delimiter">.</span>operation == Recipe_number[<span class="Constant">&quot;loop&quot;</span>] || inst<span class="Delimiter">.</span>operation == Recipe_number[<span class="Constant">&quot;break&quot;</span>]<span class="Delimiter">)</span>
        &amp;&amp; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>size<span class="Delimiter">()</span> == <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      replace_offset<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
    if <span class="Delimiter">((</span>inst<span class="Delimiter">.</span>operation == Recipe_number[<span class="Constant">&quot;loop-if&quot;</span>] || inst<span class="Delimiter">.</span>operation == Recipe_number[<span class="Constant">&quot;loop-unless&quot;</span>]
            || inst<span class="Delimiter">.</span>operation == Recipe_number[<span class="Constant">&quot;break-if&quot;</span>] || inst<span class="Delimiter">.</span>operation == Recipe_number[<span class="Constant">&quot;break-unless&quot;</span>]<span class="Delimiter">)</span>
        &amp;&amp; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>size<span class="Delimiter">()</span> == <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      replace_offset<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
void replace_offset<span class="Delimiter">(</span>reagent&amp; x<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">const</span><span class="Comment">*/</span> map&lt;string<span class="Delimiter">,</span> index_t&gt;&amp; offset<span class="Delimiter">,</span> const index_t current_offset<span class="Delimiter">,</span> const recipe_number r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="CommentedCode">//?   cerr &lt;&lt; &quot;AAA &quot; &lt;&lt; x.to_string() &lt;&lt; '\n'; //? 1</span>
  assert<span class="Delimiter">(</span>isa_literal<span class="Delimiter">(</span>x<span class="Delimiter">));</span>
<span class="CommentedCode">//?   cerr &lt;&lt; &quot;BBB &quot; &lt;&lt; x.to_string() &lt;&lt; '\n'; //? 1</span>
  assert<span class="Delimiter">(</span>!x<span class="Delimiter">.</span>initialized<span class="Delimiter">);</span>
<span class="CommentedCode">//?   cerr &lt;&lt; &quot;CCC &quot; &lt;&lt; x.to_string() &lt;&lt; '\n'; //? 1</span>
  if <span class="Delimiter">(</span>is_number<span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// non-labels will be handled like other number operands</span>
<span class="CommentedCode">//?   cerr &lt;&lt; &quot;DDD &quot; &lt;&lt; x.to_string() &lt;&lt; '\n'; //? 1</span>
  if <span class="Delimiter">(</span>offset<span class="Delimiter">.</span>find<span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">)</span> == offset<span class="Delimiter">.</span>end<span class="Delimiter">())</span>
    raise &lt;&lt; <span class="Constant">&quot;can't find label &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; in routine &quot;</span> &lt;&lt; Recipe[r]<span class="Delimiter">.</span>name &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
  x<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>offset[x<span class="Delimiter">.</span>name]-current_offset<span class="Delimiter">);</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario break_to_label)</span>
recipe main [
<span class="CommentedCode">#?   $print [aaa]</span>
  <span class="Delimiter">{</span>
    <span class="Delimiter">{</span>
      <span class="Identifier">break</span> +target:offset
      <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>:literal
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  +target
]
<span class="traceAbsent">-mem: storing 0 in location 1</span>

<span class="Delimiter">:(scenario jump_if_to_label)</span>
recipe main [
  <span class="Delimiter">{</span>
    <span class="Delimiter">{</span>
      jump-if <span class="Constant">1</span>:literal<span class="Delimiter">,</span> +target:offset
      <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>:literal
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  +target
]
<span class="traceAbsent">-mem: storing 0 in location 1</span>

<span class="Delimiter">:(scenario loop_unless_to_label)</span>
recipe main [
  <span class="Delimiter">{</span>
    <span class="Delimiter">{</span>
      loop-unless <span class="Constant">0</span>:literal<span class="Delimiter">,</span> +target:offset  <span class="Comment"># loop/break with a label don't care about braces</span>
      <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>:literal
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  +target
]
<span class="traceAbsent">-mem: storing 0 in location 1</span>

<span class="Delimiter">:(scenario jump_runs_code_after_label)</span>
recipe main [
  <span class="Comment"># first a few lines of padding to exercise the offset computation</span>
  <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
  jump +target:offset
  <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>:literal
  +target
  <span class="Constant">5</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>:literal
]
<span class="traceContains">+mem: storing 0 in location 5</span>
<span class="traceAbsent">-mem: storing 0 in location 4</span>
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