html/048typecheck.cc.html


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<span class="Comment">//: Some simple sanity checks for types, and also attempts to guess them where</span>
<span class="Comment">//: they aren't provided.</span>
<span class="Comment">//:</span>
<span class="Comment">//: You still have to provide the full type the first time you mention a</span>
<span class="Comment">//: variable in a recipe. You have to explicitly name :offset and :variant</span>
<span class="Comment">//: every single time. You can't use the same name with multiple types in a</span>
<span class="Comment">//: single recipe.</span>

<span class="Delimiter">:(scenario transform_types_warns_on_reusing_name_with_different_type)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
  x:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
  x:boolean<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
]
<span class="traceContains">+warn: x used with multiple types in main</span>

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

<span class="Delimiter">:(code)</span>
void transform_types<span class="Delimiter">(</span>const recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  map&lt;string<span class="Delimiter">,</span> vector&lt;type_ordinal&gt; &gt; metadata<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>Recipe[r]<span class="Delimiter">.</span>steps<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>
    for <span class="Delimiter">(</span>long long int in = <span class="Constant">0</span><span class="Delimiter">;</span> in &lt; SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      deduce_missing_type<span class="Delimiter">(</span>metadata<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
      check_metadata<span class="Delimiter">(</span>metadata<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>in<span class="Delimiter">),</span> r<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
    for <span class="Delimiter">(</span>long long int out = <span class="Constant">0</span><span class="Delimiter">;</span> out &lt; SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      deduce_missing_type<span class="Delimiter">(</span>metadata<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>out<span class="Delimiter">));</span>
      check_metadata<span class="Delimiter">(</span>metadata<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>out<span class="Delimiter">),</span> r<span class="Delimiter">);</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

void check_metadata<span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> vector&lt;type_ordinal&gt; &gt;&amp; metadata<span class="Delimiter">,</span> const reagent&amp; x<span class="Delimiter">,</span> const recipe_ordinal r<span class="Delimiter">)</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>
  if <span class="Delimiter">(</span>is_raw<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
  <span class="Comment">// if you use raw locations you're probably doing something unsafe</span>
  if <span class="Delimiter">(</span>is_integer<span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>x<span class="Delimiter">.</span>types<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// will throw a more precise warning elsewhere</span>
  if <span class="Delimiter">(</span>metadata<span class="Delimiter">.</span>find<span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">)</span> == metadata<span class="Delimiter">.</span>end<span class="Delimiter">())</span>
    metadata[x<span class="Delimiter">.</span>name] = x<span class="Delimiter">.</span>types<span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>metadata[x<span class="Delimiter">.</span>name] != x<span class="Delimiter">.</span>types<span class="Delimiter">)</span>
    raise &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; used with multiple types in &quot;</span> &lt;&lt; Recipe[r]<span class="Delimiter">.</span>name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario transform_types_fills_in_missing_types)</span>
recipe main [
  x:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
  y:number<span class="Special"> &lt;- </span>add x<span class="Delimiter">,</span> <span class="Constant">1</span>
]

<span class="Delimiter">:(code)</span>
void deduce_missing_type<span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> vector&lt;type_ordinal&gt; &gt;&amp; metadata<span class="Delimiter">,</span> reagent&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  if <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>types<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
  if <span class="Delimiter">(</span>metadata<span class="Delimiter">.</span>find<span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">)</span> == metadata<span class="Delimiter">.</span>end<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
  copy<span class="Delimiter">(</span>metadata[x<span class="Delimiter">.</span>name]<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> metadata[x<span class="Delimiter">.</span>name]<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> inserter<span class="Delimiter">(</span>x<span class="Delimiter">.</span>types<span class="Delimiter">,</span> x<span class="Delimiter">.</span>types<span class="Delimiter">.</span>begin<span class="Delimiter">()));</span>
  assert<span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
  x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">.</span>resize<span class="Delimiter">(</span>metadata[x<span class="Delimiter">.</span>name]<span class="Delimiter">.</span>size<span class="Delimiter">());</span>
  x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> vector&lt;string&gt; &gt;<span class="Delimiter">(</span><span class="Constant">&quot;as-before&quot;</span><span class="Delimiter">,</span> vector&lt;string&gt;<span class="Delimiter">()));</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario transform_types_fills_in_missing_types_in_product)</span>
recipe main [
  x:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
  x<span class="Special"> &lt;- </span>copy <span class="Constant">2</span>
]

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

<span class="Delimiter">:(scenario transform_warns_on_missing_types_in_first_mention)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
  x<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
  x:number<span class="Special"> &lt;- </span>copy <span class="Constant">2</span>
]
<span class="traceContains">+warn: missing type in 'x &lt;- copy 1'</span>

<span class="Delimiter">:(scenario typo_in_address_type_warns)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
  y:address:charcter<span class="Special"> &lt;- </span>new character:type
  *y<span class="Special"> &lt;- </span>copy <span class="Constant">67</span>
]
<span class="traceContains">+warn: unknown type: charcter</span>
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