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* 5915Kartik Agaram2020-01-211-3/+3
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* 5914Kartik Agaram2020-01-211-3/+1
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* 5913Kartik Agaram2020-01-201-6/+0
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* 5912Kartik Agaram2020-01-201-4115/+4450
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* 5911 - support for compound typesKartik Agaram2020-01-202-15/+13
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* 5910Kartik Agaram2020-01-201-2/+1
| | | | | Trace browser: Don't let the background color get too light, and cycle back to darker shades so I'm not squinting at low depths.
* 5909Kartik Agaram2020-01-201-18/+62
| | | | Draft 5.
* 5908Kartik Agaram2020-01-201-4/+6
| | | | | Now parse-type passes, but some outer test is failing. The result is not being consumed right by `type-equal?`.
* 5907Kartik Agaram2020-01-201-10/+24
| | | | | | Draft 3. Getting close. Now the tree structure seems right.
* 5906Kartik Agaram2020-01-201-3/+35
| | | | Draft 2.
* 5905Kartik Agaram2020-01-201-84/+329
| | | | | | | Draft of my first, incorrect attempt at parsing s-expressions. No matter how many times I've done this, I never get it right the first time.
* 5904Kartik Agaram2020-01-193-12/+12
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* 5903Kartik Agaram2020-01-193-1579/+1581
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* 5902Kartik Agaram2020-01-191-6/+6
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* 5901Kartik Agaram2020-01-1914-1147/+1176
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* 5900Kartik Agaram2020-01-191-0/+16
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* 5899Kartik Agaram2020-01-192-4/+11
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* 5898 - strengthen slice-empty? checkKartik Agaram2020-01-1915-7/+36
| | | | | | | | | | | Anytime we create a slice, the first check tends to be whether it's empty. If we handle ill-formed slices here where start > end, that provides a measure of safety. In the Mu translator (mu.subx) we often check for a trailing ':' or ',' and decrement slice->end to ignore it. But that could conceivably yield ill-formed slices if the slice started out empty. Now we make sure we never operate on such ill-formed slices.
* 5897 - rename comparison instructionsKartik Agaram2020-01-16114-1140/+1124
| | | | | | | Signed and unsigned don't quite capture the essence of what the different combinations of x86 flags are doing for SubX. The crucial distinction is that one set of comparison operators is for integers and the second is for addresses.
* 5896Kartik Agaram2020-01-162-22/+22
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* 5895Kartik Agaram2020-01-162-22/+22
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* 5894Kartik Agaram2020-01-163-10/+10
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* 5893Kartik Agaram2020-01-1428-3744/+3665
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* 5892Kartik Agaram2020-01-146-10/+4
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<span class="Comment">//: Phase 3: Start running a loaded and transformed recipe.</span>
<span class="Comment">//:</span>
<span class="Comment">//: So far we've seen recipes as lists of instructions, and instructions point</span>
<span class="Comment">//: at other recipes. To kick things off mu needs to know how to run certain</span>
<span class="Comment">//: 'primitive' recipes. That will then give the ability to run recipes</span>
<span class="Comment">//: containing these primitives.</span>
<span class="Comment">//:</span>
<span class="Comment">//: This layer defines a skeleton with just two primitive recipes: IDLE which</span>
<span class="Comment">//: does nothing, and COPY, which can copy numbers from one memory location to</span>
<span class="Comment">//: another. Later layers will add more primitives.</span>

<span class="Delimiter">:(scenario copy_literal)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">23</span>
]
<span class="traceContains">+run: 1:number &lt;- copy 23</span>
<span class="traceContains">+mem: storing 23 in location 1</span>

<span class="Delimiter">:(scenario copy)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">23</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>:number
]
<span class="traceContains">+run: 2:number &lt;- copy 1:number</span>
<span class="traceContains">+mem: location 1 is 23</span>
<span class="traceContains">+mem: storing 23 in location 2</span>

<span class="Delimiter">:(scenario copy_multiple)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Delimiter">,</span> <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">23</span><span class="Delimiter">,</span> <span class="Constant">24</span>
]
<span class="traceContains">+mem: storing 23 in location 1</span>
<span class="traceContains">+mem: storing 24 in location 2</span>

<span class="Delimiter">:(before &quot;End Types&quot;)</span>
<span class="Comment">// Book-keeping while running a recipe.</span>
<span class="Comment">//: Later layers will change this.</span>
struct routine <span class="Delimiter">{</span>
  recipe_ordinal running_recipe<span class="Delimiter">;</span>
  long long int running_step_index<span class="Delimiter">;</span>
  routine<span class="Delimiter">(</span>recipe_ordinal r<span class="Delimiter">)</span> :running_recipe<span class="Delimiter">(</span>r<span class="Delimiter">),</span> running_step_index<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{}</span>
  bool completed<span class="Delimiter">()</span> const<span class="Delimiter">;</span>
<span class="Delimiter">};</span>

<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
routine* Current_routine = <span class="Constant">NULL</span><span class="Delimiter">;</span>
map&lt;string<span class="Delimiter">,</span> long long int&gt; Instructions_running<span class="Delimiter">;</span>
map&lt;string<span class="Delimiter">,</span> long long int&gt; Locations_read<span class="Delimiter">;</span>
map&lt;string<span class="Delimiter">,</span> long long int&gt; Locations_read_by_instruction<span class="Delimiter">;</span>

<span class="Delimiter">:(code)</span>
void run<span class="Delimiter">(</span>recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  routine rr<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
  Current_routine = &amp;rr<span class="Delimiter">;</span>
  run_current_routine<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

void run_current_routine<span class="Delimiter">()</span>
<span class="Delimiter">{</span>  <span class="Comment">// curly on a separate line, because later layers will modify header</span>
  while <span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-&gt;</span>completed<span class="Delimiter">())</span>  <span class="Comment">// later layers will modify condition</span>
  <span class="Delimiter">{</span>
    <span class="Comment">// Running One Instruction</span>
<span class="CommentedCode">//?     Instructions_running[current_recipe_name()]++;</span>
    if <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>is_label<span class="Delimiter">)</span> <span class="Delimiter">{</span> ++current_step_index<span class="Delimiter">();</span> <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Delimiter">}</span>
    trace<span class="Delimiter">(</span>Initial_callstack_depth + Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> &lt;&lt; end<span class="Delimiter">();</span>
    if <span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">)</span> != <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      raise_error &lt;&lt; <span class="Constant">&quot;something wrote to location 0; this should never happen</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
      put<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
    <span class="Comment">// read all ingredients from memory, each potentially spanning multiple locations</span>
    vector&lt;vector&lt;double&gt; &gt; ingredients<span class="Delimiter">;</span>
    if <span class="Delimiter">(</span>should_copy_ingredients<span class="Delimiter">())</span> <span class="Delimiter">{</span>
      for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
        ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>read_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)));</span>
<span class="CommentedCode">//?         Locations_read[current_recipe_name()] += SIZE(ingredients.back());</span>
<span class="CommentedCode">//?         Locations_read_by_instruction[current_instruction().name] += SIZE(ingredients.back());</span>
      <span class="Delimiter">}</span>
    <span class="Delimiter">}</span>
    <span class="Comment">// instructions below will write to 'products'</span>
    vector&lt;vector&lt;double&gt; &gt; products<span class="Delimiter">;</span>
    switch <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>operation<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Comment">// Primitive Recipe Implementations</span>
      case COPY: <span class="Delimiter">{</span>
        copy<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> ingredients<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> inserter<span class="Delimiter">(</span>products<span class="Delimiter">,</span> products<span class="Delimiter">.</span>begin<span class="Delimiter">()));</span>
        <span class="Identifier">break</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>
      <span class="Comment">// End Primitive Recipe Implementations</span>
      default: <span class="Delimiter">{</span>
        cout &lt;&lt; <span class="Constant">&quot;not a primitive op: &quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>operation &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
      <span class="Delimiter">}</span>
    <span class="Delimiter">}</span>
    if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>products<span class="Delimiter">)</span> &lt; SIZE<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">))</span> <span class="Delimiter">{</span>
      raise_error &lt;&lt; SIZE<span class="Delimiter">(</span>products<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; vs &quot;</span> &lt;&lt; SIZE<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;: failed to write to all products! &quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Delimiter">}</span>
    else <span class="Delimiter">{</span>
      for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
        write_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<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="Comment">// End of Instruction</span>
    ++current_step_index<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
  stop_running_current_routine:<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

bool should_copy_ingredients<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  <span class="Comment">// End should_copy_ingredients Special-cases</span>
  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">//: Some helpers.</span>
<span class="Comment">//: We'll need to override these later as we change the definition of routine.</span>
<span class="Comment">//: Important that they return referrences into the routine.</span>

inline long long int&amp; current_step_index<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  <span class="Identifier">return</span> Current_routine<span class="Delimiter">-&gt;</span>running_step_index<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

inline const string&amp; current_recipe_name<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  <span class="Identifier">return</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> Current_routine<span class="Delimiter">-&gt;</span>running_recipe<span class="Delimiter">).</span>name<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

inline const instruction&amp; current_instruction<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  <span class="Identifier">return</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> Current_routine<span class="Delimiter">-&gt;</span>running_recipe<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>running_step_index<span class="Delimiter">);</span>
<span class="Delimiter">}</span>

inline bool routine::completed<span class="Delimiter">()</span> const <span class="Delimiter">{</span>
  <span class="Identifier">return</span> running_step_index &gt;= SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> running_recipe<span class="Delimiter">).</span>steps<span class="Delimiter">);</span>
<span class="Delimiter">}</span>

<span class="SalientComment">//:: Startup flow</span>

<span class="Comment">//: Step 1: load all .mu files with numeric prefixes (in order)</span>
<span class="Delimiter">:(before &quot;End Load Recipes&quot;)</span>
<span class="CommentedCode">//? Trace_file = &quot;interactive&quot;;</span>
<span class="CommentedCode">//? START_TRACING_UNTIL_END_OF_SCOPE;</span>
load_permanently<span class="Delimiter">(</span><span class="Constant">&quot;core.mu&quot;</span><span class="Delimiter">);</span>
transform_all<span class="Delimiter">();</span>

<span class="Comment">//: Step 2: load any .mu files provided at the commandline</span>
<span class="Delimiter">:(before &quot;End Commandline Parsing&quot;)</span>
if <span class="Delimiter">(</span>argc &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Comment">// skip argv[0]</span>
  argv++<span class="Delimiter">;</span>
  argc--<span class="Delimiter">;</span>
  <span class="Comment">// ignore argv past '--'; that's commandline args for 'main'</span>
  while <span class="Delimiter">(</span>argc &gt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>string<span class="Delimiter">(</span>*argv<span class="Delimiter">)</span> == <span class="Constant">&quot;--&quot;</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
    load_permanently<span class="Delimiter">(</span>*argv<span class="Delimiter">);</span>
    argv++<span class="Delimiter">;</span>
    argc--<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  transform_all<span class="Delimiter">();</span>
<span class="CommentedCode">//?   dump_recipe(&quot;handle-keyboard-event&quot;),  exit(0);</span>
  if <span class="Delimiter">(</span>Run_tests<span class="Delimiter">)</span> Recipe<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;main&quot;</span><span class="Delimiter">));</span>
  <span class="Comment">// End Loading .mu Files</span>
<span class="Delimiter">}</span>

<span class="Comment">//: Step 3: if we aren't running tests, locate a recipe called 'main' and</span>
<span class="Comment">//: start running it.</span>
<span class="Delimiter">:(before &quot;End Main&quot;)</span>
if <span class="Delimiter">(</span>!Run_tests &amp;&amp; contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;main&quot;</span><span class="Delimiter">)</span> &amp;&amp; contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;main&quot;</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
  setup<span class="Delimiter">();</span>
<span class="CommentedCode">//?   Trace_file = &quot;interactive&quot;;</span>
<span class="CommentedCode">//?   START_TRACING_UNTIL_END_OF_SCOPE;</span>
  trace<span class="Delimiter">(</span><span class="Constant">9990</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;=== Starting to run&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  run_main<span class="Delimiter">(</span>argc<span class="Delimiter">,</span> argv<span class="Delimiter">);</span>
  teardown<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
void run_main<span class="Delimiter">(</span>int argc<span class="Delimiter">,</span> char* argv[]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  recipe_ordinal r = get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;main&quot;</span><span class="Delimiter">);</span>
  if <span class="Delimiter">(</span>r<span class="Delimiter">)</span> run<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
void dump_profile<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  for <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> long long int&gt;::iterator p = Instructions_running<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Instructions_running<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    cerr &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>second &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  cerr &lt;&lt; <span class="Constant">&quot;== locations read</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
  for <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> long long int&gt;::iterator p = Locations_read<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Locations_read<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    cerr &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>second &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  cerr &lt;&lt; <span class="Constant">&quot;== locations read by instruction</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
  for <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> long long int&gt;::iterator p = Locations_read_by_instruction<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Locations_read_by_instruction<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    cerr &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>second &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before &quot;End One-time Setup&quot;)</span>
<span class="CommentedCode">//? atexit(dump_profile);</span>

<span class="Delimiter">:(code)</span>
void cleanup_main<span class="Delimiter">()</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>!Trace_file<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    ofstream fout<span class="Delimiter">((</span>Trace_dir+Trace_file<span class="Delimiter">).</span>c_str<span class="Delimiter">());</span>
    fout &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span>readable_contents<span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
    fout<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before &quot;End One-time Setup&quot;)</span>
atexit<span class="Delimiter">(</span>cleanup_main<span class="Delimiter">);</span>

<span class="Delimiter">:(code)</span>
void load_permanently<span class="Delimiter">(</span>string filename<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>is_directory<span class="Delimiter">(</span>filename<span class="Delimiter">))</span> <span class="Delimiter">{</span>
    load_all_permanently<span class="Delimiter">(</span>filename<span class="Delimiter">);</span>
    <span class="Identifier">return</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  ifstream fin<span class="Delimiter">(</span>filename<span class="Delimiter">.</span>c_str<span class="Delimiter">());</span>
  fin<span class="Delimiter">.</span>peek<span class="Delimiter">();</span>
  if <span class="Delimiter">(</span>!fin<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise_error &lt;&lt; <span class="Constant">&quot;no such file &quot;</span> &lt;&lt; filename &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">return</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  fin &gt;&gt; std::noskipws<span class="Delimiter">;</span>
  trace<span class="Delimiter">(</span><span class="Constant">9990</span><span class="Delimiter">,</span> <span class="Constant">&quot;load&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;=== &quot;</span> &lt;&lt; filename &lt;&lt; end<span class="Delimiter">();</span>
  load<span class="Delimiter">(</span>fin<span class="Delimiter">);</span>
  fin<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
  <span class="Comment">// freeze everything so it doesn't get cleared by tests</span>
  Recently_added_recipes<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
  <span class="Comment">// End load_permanently.</span>
<span class="Delimiter">}</span>

bool is_directory<span class="Delimiter">(</span>string path<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  struct stat info<span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>stat<span class="Delimiter">(</span>path<span class="Delimiter">.</span>c_str<span class="Delimiter">(),</span> &amp;info<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>  <span class="Comment">// error</span>
  <span class="Identifier">return</span> info<span class="Delimiter">.</span>st_mode &amp; S_IFDIR<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

void load_all_permanently<span class="Delimiter">(</span>string dir<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  dirent** files<span class="Delimiter">;</span>
  int num_files = scandir<span class="Delimiter">(</span>dir<span class="Delimiter">.</span>c_str<span class="Delimiter">(),</span> &amp;files<span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">,</span> alphasort<span class="Delimiter">);</span>
  for <span class="Delimiter">(</span>int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; num_files<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    string curr_file = files[i]<span class="Delimiter">-&gt;</span>d_name<span class="Delimiter">;</span>
    if <span class="Delimiter">(</span>!isdigit<span class="Delimiter">(</span>curr_file<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    load_permanently<span class="Delimiter">(</span>dir+<span class="Constant">'/'</span>+curr_file<span class="Delimiter">);</span>
    free<span class="Delimiter">(</span>files[i]<span class="Delimiter">);</span>
    files[i] = <span class="Constant">NULL</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  free<span class="Delimiter">(</span>files<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before &quot;End Includes&quot;)</span>
<span class="PreProc">#include</span><span class="Constant">&lt;dirent.h&gt;</span>
<span class="PreProc">#include</span><span class="Constant">&lt;sys/stat.h&gt;</span>

<span class="SalientComment">//:: Reading from memory, writing to memory.</span>

<span class="Delimiter">:(code)</span>
vector&lt;double&gt; read_memory<span class="Delimiter">(</span>reagent x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  vector&lt;double&gt; result<span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
    result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>x<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
    <span class="Identifier">return</span> result<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  long long int base = x<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
  long long int size = size_of<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
  for <span class="Delimiter">(</span>long long int offset = <span class="Constant">0</span><span class="Delimiter">;</span> offset &lt; size<span class="Delimiter">;</span> ++offset<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    double val = get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> base+offset<span class="Delimiter">);</span>
    trace<span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;location &quot;</span> &lt;&lt; base+offset &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>val<span class="Delimiter">)</span> &lt;&lt; end<span class="Delimiter">();</span>
    result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>val<span class="Delimiter">);</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

void write_memory<span class="Delimiter">(</span>reagent x<span class="Delimiter">,</span> vector&lt;double&gt; data<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise_error &lt;&lt; <span class="Constant">&quot;can't write to &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;; no type</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">return</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  if <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
  long long int base = x<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>size_mismatch<span class="Delimiter">(</span>x<span class="Delimiter">,</span> data<span class="Delimiter">))</span> <span class="Delimiter">{</span>
    raise_error &lt;&lt; maybe<span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;size mismatch in storing to &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot; (&quot;</span> &lt;&lt; size_of<span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; vs &quot;</span> &lt;&lt; SIZE<span class="Delimiter">(</span>data<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;) at '&quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">return</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  for <span class="Delimiter">(</span>long long int offset = <span class="Constant">0</span><span class="Delimiter">;</span> offset &lt; SIZE<span class="Delimiter">(</span>data<span class="Delimiter">);</span> ++offset<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>base+offset == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    trace<span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>data<span class="Delimiter">.</span>at<span class="Delimiter">(</span>offset<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; base+offset &lt;&lt; end<span class="Delimiter">();</span>
    put<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> base+offset<span class="Delimiter">,</span> data<span class="Delimiter">.</span>at<span class="Delimiter">(</span>offset<span class="Delimiter">));</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
long long int size_of<span class="Delimiter">(</span>const reagent&amp; r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>r<span class="Delimiter">.</span>type == <span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
  <span class="Comment">// End size_of(reagent) Cases</span>
  <span class="Identifier">return</span> size_of<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
long long int size_of<span class="Delimiter">(</span>const type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>type == <span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
  <span class="Comment">// End size_of(type) Cases</span>
  <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

bool size_mismatch<span class="Delimiter">(</span>const reagent&amp; x<span class="Delimiter">,</span> const vector&lt;double&gt;&amp; data<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>x<span class="Delimiter">.</span>type == <span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
  <span class="Comment">// End size_mismatch(x) Cases</span>
<span class="CommentedCode">//?   if (size_of(x) != SIZE(data)) cerr &lt;&lt; size_of(x) &lt;&lt; &quot; vs &quot; &lt;&lt; SIZE(data) &lt;&lt; '\n';</span>
  <span class="Identifier">return</span> size_of<span class="Delimiter">(</span>x<span class="Delimiter">)</span> != SIZE<span class="Delimiter">(</span>data<span class="Delimiter">);</span>
<span class="Delimiter">}</span>

inline bool is_dummy<span class="Delimiter">(</span>const reagent&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Identifier">return</span> x<span class="Delimiter">.</span>name == <span class="Constant">&quot;_&quot;</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

inline bool is_literal<span class="Delimiter">(</span>const reagent&amp; r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span><span class="Delimiter">)</span>
    assert<span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left &amp;&amp; !r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
  <span class="Identifier">return</span> r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

inline bool scalar<span class="Delimiter">(</span>const vector&lt;long long int&gt;&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Identifier">return</span> SIZE<span class="Delimiter">(</span>x<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
inline bool scalar<span class="Delimiter">(</span>const vector&lt;double&gt;&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Identifier">return</span> SIZE<span class="Delimiter">(</span>x<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">// helper for tests</span>
void run<span class="Delimiter">(</span>string form<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  vector&lt;recipe_ordinal&gt; tmp = load<span class="Delimiter">(</span>form<span class="Delimiter">);</span>
  transform_all<span class="Delimiter">();</span>
  if <span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
  run<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>front<span class="Delimiter">());</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario run_label)</span>
recipe main [
  +foo
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">23</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>:number
]
<span class="traceContains">+run: 1:number &lt;- copy 23</span>
<span class="traceContains">+run: 2:number &lt;- copy 1:number</span>
<span class="traceAbsent">-run: +foo</span>

<span class="Delimiter">:(scenario run_dummy)</span>
recipe main [
  _<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
]
<span class="traceContains">+run: _ &lt;- copy 0</span>

<span class="Delimiter">:(scenario write_to_0_disallowed)</span>
<span class="Special">% Hide_errors = true;</span>
recipe main [
  <span class="Constant">0</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
]
<span class="traceAbsent">-mem: storing 34 in location 0</span>

<span class="Comment">//: mu is robust to various combinations of commas and spaces. You just have</span>
<span class="Comment">//: to put spaces around the '&lt;-'.</span>

<span class="Delimiter">:(scenario comma_without_space)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Delimiter">,</span> <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">2</span><span class="Delimiter">,</span><span class="Constant">2</span>
]
<span class="traceContains">+mem: storing 2 in location 1</span>

<span class="Delimiter">:(scenario space_without_comma)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Delimiter">,</span> <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">2</span> <span class="Constant">2</span>
]
<span class="traceContains">+mem: storing 2 in location 1</span>

<span class="Delimiter">:(scenario comma_before_space)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Delimiter">,</span> <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">2</span>
]
<span class="traceContains">+mem: storing 2 in location 1</span>

<span class="Delimiter">:(scenario comma_after_space)</span>
recipe main [
  <span class="Constant">1</span>:number<span class="Delimiter">,</span> <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">2</span> <span class="Delimiter">,</span><span class="Constant">2</span>
]
<span class="traceContains">+mem: storing 2 in location 1</span>
</pre>
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