html/012transform.cc.html


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<span class="Comment">//: Phase 2: Filter loaded recipes through an extensible list of 'transforms'.</span>
<span class="Comment">//:</span>
<span class="Comment">//:   The process of running Mu code:</span>
<span class="Comment">//:     load -&gt; transform -&gt; run</span>
<span class="Comment">//:</span>
<span class="Comment">//: The hope is that this framework of transform tools will provide a</span>
<span class="Comment">//: deconstructed alternative to conventional compilers.</span>
<span class="Comment">//:</span>
<span class="Comment">//: We're going to have many transforms in Mu, and getting their order right</span>
<span class="Comment">//: (not the same as ordering of layers) is a well-known problem. Some tips:</span>
<span class="Comment">//:   a) Design each layer to rely on as few previous layers as possible.</span>
<span class="Comment">//:</span>
<span class="Comment">//:   b) When positioning transforms, try to find the tightest constraint in</span>
<span class="Comment">//:   each transform relative to previous layers.</span>
<span class="Comment">//:</span>
<span class="Comment">//:   c) Even so you'll periodically need to try adjusting each transform</span>
<span class="Comment">//:   relative to those in previous layers to find a better arrangement.</span>

<span class="Delimiter">:(before &quot;End recipe Fields&quot;)</span>
<span class="Normal">int</span> transformed_until<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End recipe Constructor&quot;)</span>
transformed_until = -<span class="Constant">1</span><span class="Delimiter">;</span>

<span class="Delimiter">:(before &quot;End Types&quot;)</span>
<span class="Normal">typedef</span> <span class="Normal">void</span> <span class="Delimiter">(</span>*transform_fn<span class="Delimiter">)(</span><span class="Normal">const</span> recipe_ordinal<span class="Delimiter">);</span>

<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
vector&lt;transform_fn&gt; Transform<span class="Delimiter">;</span>

<span class="Delimiter">:(before &quot;End One-time Setup&quot;)</span>
initialize_transforms<span class="Delimiter">();</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> initialize_transforms<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  <span class="Comment">// Begin Transforms</span>
    <span class="Comment">// Begin Instruction Inserting/Deleting Transforms</span>
    <span class="Comment">// End Instruction Inserting/Deleting Transforms</span>

    <span class="Comment">// Begin Instruction Modifying Transforms</span>
    <span class="Comment">// End Instruction Modifying Transforms</span>
  <span class="Comment">// End Transforms</span>

  <span class="Comment">// Begin Checks</span>
  <span class="Comment">// End Checks</span>
<span class="Delimiter">}</span>

<span class="Normal">void</span> transform_all<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  trace<span class="Delimiter">(</span><span class="Constant">9990</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;=== transform_all()&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> t = <span class="Constant">0</span><span class="Delimiter">;</span>  t &lt; SIZE<span class="Delimiter">(</span>Transform<span class="Delimiter">);</span>  ++t<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;recipe_ordinal<span class="Delimiter">,</span> recipe&gt;::iterator p = Recipe<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Recipe<span class="Delimiter">.</span>end<span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      recipe&amp; r = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>transformed_until != t-<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
      <span class="Comment">// End Transform Checks</span>
      <span class="Delimiter">(</span>*Transform<span class="Delimiter">.</span>at<span class="Delimiter">(</span>t<span class="Delimiter">))(</span><span class="Comment">/*</span><span class="Comment">recipe_ordinal</span><span class="Comment">*/</span>p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">);</span>
      r<span class="Delimiter">.</span>transformed_until = t<span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  parse_int_reagents<span class="Delimiter">();</span>  <span class="Comment">// do this after all other transforms have run</span>
  <span class="Comment">// End transform_all</span>
<span class="Delimiter">}</span>

<span class="Comment">//: Even though a run will involve many calls to transform_all() for tests,</span>
<span class="Comment">//: our logical model is to load all code, then transform all code, then run.</span>
<span class="Comment">//: If you load new code that should cause already-transformed recipes to</span>
<span class="Comment">//: change, that's not supported. To help detect such situations and raise</span>
<span class="Comment">//: helpful errors we track a count of the number of calls made to</span>
<span class="Comment">//: transform_all().</span>
<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span class="Normal">int</span> Num_calls_to_transform_all = <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">:(after &quot;void transform_all()&quot;)</span>
  ++Num_calls_to_transform_all<span class="Delimiter">;</span>

<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> parse_int_reagents<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- parsing any uninitialized reagents as integers&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;recipe_ordinal<span class="Delimiter">,</span> recipe&gt;::iterator p = Recipe<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Recipe<span class="Delimiter">.</span>end<span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    recipe&amp; r = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>  index &lt; SIZE<span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      instruction&amp; inst = r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
        populate_value<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
      <span class="Delimiter">}</span>
      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
        populate_value<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
      <span class="Delimiter">}</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Normal">void</span> populate_value<span class="Delimiter">(</span>reagent&amp; r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>initialized<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
  <span class="Comment">// End Reagent-parsing Exceptions</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_integer<span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
  r<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>to_integer<span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">));</span>
<span class="Delimiter">}</span>

<span class="Comment">// helper for tests -- temporarily suppress run</span>
<span class="Normal">void</span> transform<span class="Delimiter">(</span>string form<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  load<span class="Delimiter">(</span>form<span class="Delimiter">);</span>
  transform_all<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
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