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<a href='https://github.com/akkartik/mu/blob/master/012transform.cc'>https://github.com/akkartik/mu/blob/master/012transform.cc</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Phase 2: Filter loaded recipes through an extensible list of 'transforms'.</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">//:</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//: The process of running Mu code:</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment">//: load -> transform -> run</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment">//:</span>
<span id="L6" class="LineNr"> 6 </span><span class="Comment">//: The hope is that this framework of transform tools will provide a</span>
<span id="L7" class="LineNr"> 7 </span><span class="Comment">//: deconstructed alternative to conventional compilers.</span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment">//:</span>
<span id="L9" class="LineNr"> 9 </span><span class="Comment">//: We're going to have many transforms in Mu, and getting their order right</span>
<span id="L10" class="LineNr"> 10 </span><span class="Comment">//: (not the same as ordering of layers) is a well-known problem. Some tips:</span>
<span id="L11" class="LineNr"> 11 </span><span class="Comment">//: a) Design each layer to rely on as few previous layers as possible.</span>
<span id="L12" class="LineNr"> 12 </span><span class="Comment">//:</span>
<span id="L13" class="LineNr"> 13 </span><span class="Comment">//: b) When positioning transforms, try to find the tightest constraint in</span>
<span id="L14" class="LineNr"> 14 </span><span class="Comment">//: each transform relative to previous layers.</span>
<span id="L15" class="LineNr"> 15 </span><span class="Comment">//:</span>
<span id="L16" class="LineNr"> 16 </span><span class="Comment">//: c) Even so you'll periodically need to try adjusting each transform</span>
<span id="L17" class="LineNr"> 17 </span><span class="Comment">//: relative to those in previous layers to find a better arrangement.</span>
<span id="L18" class="LineNr"> 18 </span>
<span id="L19" class="LineNr"> 19 </span><span class="Delimiter">:(before "End <a href='010vm.cc.html#L19'>recipe</a> Fields")</span>
<span id="L20" class="LineNr"> 20 </span><span class="Normal">int</span> transformed_until<span class="Delimiter">;</span>
<span id="L21" class="LineNr"> 21 </span><span class="Delimiter">:(before "End <a href='010vm.cc.html#L19'>recipe</a> Constructor")</span>
<span id="L22" class="LineNr"> 22 </span>transformed_until = -<span class="Constant">1</span><span class="Delimiter">;</span>
<span id="L23" class="LineNr"> 23 </span>
<span id="L24" class="LineNr"> 24 </span><span class="Delimiter">:(before "End Types")</span>
<span id="L25" class="LineNr"> 25 </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> <a href='010vm.cc.html#L14'>recipe_ordinal</a><span class="Delimiter">);</span>
<span id="L26" class="LineNr"> 26 </span>
<span id="L27" class="LineNr"> 27 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L28" class="LineNr"> 28 </span>vector<transform_fn> <span class="Special">Transform</span><span class="Delimiter">;</span>
<span id="L29" class="LineNr"> 29 </span>
<span id="L30" class="LineNr"> 30 </span><span class="Delimiter">:(before "End One-time Setup")</span>
<span id="L31" class="LineNr"> 31 </span><a href='012transform.cc.html#L33'>initialize_transforms</a><span class="Delimiter">();</span>
<span id="L32" class="LineNr"> 32 </span><span class="Delimiter">:(code)</span>
<span id="L33" class="LineNr"> 33 </span><span class="Normal">void</span> <a href='012transform.cc.html#L33'>initialize_transforms</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L34" class="LineNr"> 34 </span> <span class="Comment">// Begin Transforms</span>
<span id="L35" class="LineNr"> 35 </span> <span class="Comment">// Begin Instruction Inserting/Deleting Transforms</span>
<span id="L36" class="LineNr"> 36 </span> <span class="Comment">// End Instruction Inserting/Deleting Transforms</span>
<span id="L37" class="LineNr"> 37 </span>
<span id="L38" class="LineNr"> 38 </span> <span class="Comment">// Begin Instruction Modifying Transforms</span>
<span id="L39" class="LineNr"> 39 </span> <span class="Comment">// End Instruction Modifying Transforms</span>
<span id="L40" class="LineNr"> 40 </span> <span class="Comment">// End Transforms</span>
<span id="L41" class="LineNr"> 41 </span>
<span id="L42" class="LineNr"> 42 </span> <span class="Comment">// Begin Checks</span>
<span id="L43" class="LineNr"> 43 </span> <span class="Comment">// End Checks</span>
<span id="L44" class="LineNr"> 44 </span><span class="Delimiter">}</span>
<span id="L45" class="LineNr"> 45 </span>
<span id="L46" class="LineNr"> 46 </span><span class="Normal">void</span> <a href='012transform.cc.html#L46'>transform_all</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L47" class="LineNr"> 47 </span> <a href='003trace.cc.html#L189'>trace</a><span class="Delimiter">(</span><span class="Constant">9990</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"=== transform_all()"</span> << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L48" class="LineNr"> 48 </span> <span class="Comment">// Begin transform_all</span>
<span id="L49" class="LineNr"> 49 </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 < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span><span class="Special">Transform</span><span class="Delimiter">);</span> ++t<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L50" class="LineNr"> 50 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>map<recipe_ordinal<span class="Delimiter">,</span> recipe>::iterator p = <span class="Special">Recipe</span><span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <span class="Special">Recipe</span><span class="Delimiter">.</span><a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L51" class="LineNr"> 51 </span> recipe& r = p<span class="Delimiter">-></span>second<span class="Delimiter">;</span>
<span id="L52" class="LineNr"> 52 </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 id="L53" class="LineNr"> 53 </span> <span class="Comment">// End Transform Checks</span>
<span id="L54" class="LineNr"> 54 </span> <span class="Delimiter">(</span>*<span class="Special">Transform</span><span class="Delimiter">.</span>at<span class="Delimiter">(</span>t<span class="Delimiter">))(</span><span class="Comment">/*</span><span class="Comment"><a href='010vm.cc.html#L14'>recipe_ordinal</a></span><span class="Comment">*/</span>p<span class="Delimiter">-></span>first<span class="Delimiter">);</span>
<span id="L55" class="LineNr"> 55 </span> r<span class="Delimiter">.</span>transformed_until = t<span class="Delimiter">;</span>
<span id="L56" class="LineNr"> 56 </span> <span class="Delimiter">}</span>
<span id="L57" class="LineNr"> 57 </span> <span class="Delimiter">}</span>
<span id="L58" class="LineNr"> 58 </span> <a href='012transform.cc.html#L74'>parse_int_reagents</a><span class="Delimiter">();</span> <span class="Comment">// do this after all other transforms have run</span>
<span id="L59" class="LineNr"> 59 </span> <span class="Comment">// End transform_all</span>
<span id="L60" class="LineNr"> 60 </span><span class="Delimiter">}</span>
<span id="L61" class="LineNr"> 61 </span>
<span id="L62" class="LineNr"> 62 </span><span class="Comment">//: Even though a run will involve many calls to transform_all() for tests,</span>
<span id="L63" class="LineNr"> 63 </span><span class="Comment">//: our logical model is to load all code, then transform all code, then run.</span>
<span id="L64" class="LineNr"> 64 </span><span class="Comment">//: If you load new code that should cause already-transformed recipes to</span>
<span id="L65" class="LineNr"> 65 </span><span class="Comment">//: change, that's not supported. To help detect such situations and raise</span>
<span id="L66" class="LineNr"> 66 </span><span class="Comment">//: helpful errors we track a count of the number of calls made to</span>
<span id="L67" class="LineNr"> 67 </span><span class="Comment">//: transform_all().</span>
<span id="L68" class="LineNr"> 68 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L69" class="LineNr"> 69 </span><span class="Normal">int</span> <span class="Special">Num_calls_to_transform_all</span> = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L70" class="LineNr"> 70 </span><span class="Delimiter">:(after "void transform_all()")</span>
<span id="L71" class="LineNr"> 71 </span> ++<span class="Special">Num_calls_to_transform_all</span><span class="Delimiter">;</span>
<span id="L72" class="LineNr"> 72 </span>
<span id="L73" class="LineNr"> 73 </span><span class="Delimiter">:(code)</span>
<span id="L74" class="LineNr"> 74 </span><span class="Normal">void</span> <a href='012transform.cc.html#L74'>parse_int_reagents</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L75" class="LineNr"> 75 </span> <a href='003trace.cc.html#L189'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"--- parsing any uninitialized reagents as integers"</span> << <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L76" class="LineNr"> 76 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>map<recipe_ordinal<span class="Delimiter">,</span> recipe>::iterator p = <span class="Special">Recipe</span><span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <span class="Special">Recipe</span><span class="Delimiter">.</span><a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L77" class="LineNr"> 77 </span> recipe& r = p<span class="Delimiter">-></span>second<span class="Delimiter">;</span>
<span id="L78" class="LineNr"> 78 </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 id="L79" class="LineNr"> 79 </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 < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L80" class="LineNr"> 80 </span> instruction& inst = r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
<span id="L81" class="LineNr"> 81 </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 < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L82" class="LineNr"> 82 </span> <a href='012transform.cc.html#L91'>populate_value</a><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 id="L83" class="LineNr"> 83 </span> <span class="Delimiter">}</span>
<span id="L84" class="LineNr"> 84 </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 < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L85" class="LineNr"> 85 </span> <a href='012transform.cc.html#L91'>populate_value</a><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 id="L86" class="LineNr"> 86 </span> <span class="Delimiter">}</span>
<span id="L87" class="LineNr"> 87 </span> <span class="Delimiter">}</span>
<span id="L88" class="LineNr"> 88 </span> <span class="Delimiter">}</span>
<span id="L89" class="LineNr"> 89 </span><span class="Delimiter">}</span>
<span id="L90" class="LineNr"> 90 </span>
<span id="L91" class="LineNr"> 91 </span><span class="Normal">void</span> <a href='012transform.cc.html#L91'>populate_value</a><span class="Delimiter">(</span>reagent& r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L92" class="LineNr"> 92 </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 id="L93" class="LineNr"> 93 </span> <span class="Comment">// End Reagent-parsing Exceptions</span>
<span id="L94" class="LineNr"> 94 </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>
<span id="L95" class="LineNr"> 95 </span> r<span class="Delimiter">.</span><a href='010vm.cc.html#L67'>set_value</a><span class="Delimiter">(</span>to_integer<span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">));</span>
<span id="L96" class="LineNr"> 96 </span><span class="Delimiter">}</span>
<span id="L97" class="LineNr"> 97 </span>
<span id="L98" class="LineNr"> 98 </span><span class="Comment">// helper for tests -- temporarily suppress run</span>
<span id="L99" class="LineNr"> 99 </span><span class="Normal">void</span> <a href='012transform.cc.html#L99'>transform</a><span class="Delimiter">(</span>string form<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L100" class="LineNr">100 </span> load<span class="Delimiter">(</span>form<span class="Delimiter">);</span>
<span id="L101" class="LineNr">101 </span> <a href='012transform.cc.html#L46'>transform_all</a><span class="Delimiter">();</span>
<span id="L102" class="LineNr">102 </span><span class="Delimiter">}</span>
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