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<span class="Comment">//: Writing to a literal (not computed) address of 0 in a recipe chains two</span>
<span class="Comment">//: spaces together. When a variable has a property of /space:1, it looks up</span>
<span class="Comment">//: the variable in the chained/surrounding space. /space:2 looks up the</span>
<span class="Comment">//: surrounding space of the surrounding space, etc.</span>
<span class="Delimiter">:(scenario closure)</span>
<span class="muRecipe">def</span> main [
<span class="Normal">default</span>-space:space<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">location:type</span><span class="Delimiter">,</span> <span class="Constant">30</span>
<span class="Constant">1</span>:space/names:<span class="Normal">new</span>-counter<span class="Special"> <- </span><span class="Normal">new</span>-counter
<span class="Constant">2</span>:num/<span class="Special">raw <- </span>increment-counter <span class="Constant">1</span>:space/names:<span class="Normal">new</span>-counter
<span class="Constant">3</span>:num/<span class="Special">raw <- </span>increment-counter <span class="Constant">1</span>:space/names:<span class="Normal">new</span>-counter
]
<span class="muRecipe">def</span> <span class="Normal">new</span>-counter [
<span class="Normal">default</span>-space:space<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">location:type</span><span class="Delimiter">,</span> <span class="Constant">30</span>
<span class="Normal">x</span>:num<span class="Special"> <- </span>copy <span class="Constant">23</span>
<span class="Normal">y</span>:num<span class="Special"> <- </span>copy <span class="Constant">3</span> <span class="Comment"># variable that will be incremented</span>
<span class="Identifier">return</span> <span class="Normal">default</span>-space:space
]
<span class="muRecipe">def</span> increment-counter [
<span class="Normal">default</span>-space:space<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">location:type</span><span class="Delimiter">,</span> <span class="Constant">30</span>
<span class="Constant">0</span>:space/names:<span class="Normal">new</span>-counter<span class="Special"> <- </span>next-ingredient <span class="Comment"># outer space must be created by 'new-counter' above</span>
<span class="Normal">y</span>:num/space:<span class="Constant">1</span><span class="Special"> <- </span>add y:num/space:<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">1</span> <span class="Comment"># increment</span>
<span class="Normal">y</span>:num<span class="Special"> <- </span>copy <span class="Constant">234</span> <span class="Comment"># dummy</span>
<span class="Identifier">return</span> y:num/space:<span class="Constant">1</span>
]
<span class="traceContains">+name: lexically surrounding space for recipe increment-counter comes from new-counter</span>
<span class="traceContains">+mem: storing 5 in location 3</span>
<span class="Comment">//: To make this work, compute the recipe that provides names for the</span>
<span class="Comment">//: surrounding space of each recipe.</span>
<span class="Delimiter">:(before "End Globals")</span>
map<recipe_ordinal<span class="Delimiter">,</span> recipe_ordinal> Surrounding_space<span class="Delimiter">;</span>
<span class="Delimiter">:(before "Transform.push_back(transform_names)")</span>
Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>collect_surrounding_spaces<span class="Delimiter">);</span> <span class="Comment">// idempotent</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> collect_surrounding_spaces<span class="Delimiter">(</span><span class="Normal">const</span> recipe_ordinal r<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">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"--- collect surrounding spaces for recipe "</span> << get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name << end<span class="Delimiter">();</span>
<span class="CommentedCode">//? cerr << "--- collect surrounding spaces for recipe " << get(Recipe, r).name << '\n';</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 < SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">const</span> instruction& inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<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> j = <span class="Constant">0</span><span class="Delimiter">;</span> j < SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">).</span>name != <span class="Constant">"0"</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!is_space<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"slot 0 should always have type address:array:location, but is '"</span> << to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">))</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
string_tree* s = property<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> <span class="Constant">"names"</span><span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"slot 0 requires a /names property in recipe '"</span> << get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!s<span class="Delimiter">-></span>atom<span class="Delimiter">)</span> raise << <span class="Constant">"slot 0 should have a single value in /names, but got '"</span> << to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">))</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Normal">const</span> string& surrounding_recipe_name = s<span class="Delimiter">-></span>value<span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>surrounding_recipe_name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"slot 0 doesn't initialize its /names property in recipe '"</span> << get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">)</span>
&& get<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">)</span> != get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> surrounding_recipe_name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"recipe '"</span> << get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name << <span class="Constant">"' can have only one 'surrounding' recipe but has '"</span> << get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">)).</span>name << <span class="Constant">"' and '"</span> << surrounding_recipe_name << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">"name"</span><span class="Delimiter">)</span> << <span class="Constant">"lexically surrounding space for recipe "</span> << get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name << <span class="Constant">" comes from "</span> << surrounding_recipe_name << end<span class="Delimiter">();</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> surrounding_recipe_name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"can't find recipe providing surrounding space for '"</span> << get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name << <span class="Constant">"'; looking for '"</span> << surrounding_recipe_name << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
put<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> surrounding_recipe_name<span class="Delimiter">));</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Comment">//: Once surrounding spaces are available, transform_names uses them to handle</span>
<span class="Comment">//: /space properties.</span>
<span class="Delimiter">:(replace{} "int lookup_name(const reagent& r, const recipe_ordinal default_recipe)")</span>
<span class="Normal">int</span> lookup_name<span class="Delimiter">(</span><span class="Normal">const</span> reagent& x<span class="Delimiter">,</span> <span class="Normal">const</span> recipe_ordinal default_recipe<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!has_property<span class="Delimiter">(</span>x<span class="Delimiter">,</span> <span class="Constant">"space"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>Name[default_recipe]<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> raise << <span class="Constant">"name not found: "</span> << x<span class="Delimiter">.</span>name << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> Name[default_recipe][x<span class="Delimiter">.</span>name]<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
string_tree* p = property<span class="Delimiter">(</span>x<span class="Delimiter">,</span> <span class="Constant">"space"</span><span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!p || !p<span class="Delimiter">-></span>atom<span class="Delimiter">)</span> raise << <span class="Constant">"/space property should have exactly one (non-negative integer) value</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Normal">int</span> n = to_integer<span class="Delimiter">(</span>p<span class="Delimiter">-></span>value<span class="Delimiter">);</span>
assert<span class="Delimiter">(</span>n >= <span class="Constant">0</span><span class="Delimiter">);</span>
recipe_ordinal surrounding_recipe = lookup_surrounding_recipe<span class="Delimiter">(</span>default_recipe<span class="Delimiter">,</span> n<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>surrounding_recipe == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">return</span> -<span class="Constant">1</span><span class="Delimiter">;</span>
set<recipe_ordinal> done<span class="Delimiter">;</span>
vector<recipe_ordinal> path<span class="Delimiter">;</span>
<span class="Identifier">return</span> lookup_name<span class="Delimiter">(</span>x<span class="Delimiter">,</span> surrounding_recipe<span class="Delimiter">,</span> done<span class="Delimiter">,</span> path<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Comment">// If the recipe we need to lookup this name in doesn't have names done yet,</span>
<span class="Comment">// recursively call transform_names on it.</span>
<span class="Normal">int</span> lookup_name<span class="Delimiter">(</span><span class="Normal">const</span> reagent& x<span class="Delimiter">,</span> <span class="Normal">const</span> recipe_ordinal r<span class="Delimiter">,</span> set<recipe_ordinal>& done<span class="Delimiter">,</span> vector<recipe_ordinal>& path<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!Name[r]<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span> Name[r][x<span class="Delimiter">.</span>name]<span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>done<span class="Delimiter">,</span> r<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"can't compute address of '"</span> << to_string<span class="Delimiter">(</span>x<span class="Delimiter">)</span> << <span class="Constant">"' because</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">1</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>path<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << path<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i-<span class="Constant">1</span><span class="Delimiter">)</span> << <span class="Constant">" requires computing names of "</span> << path<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
raise << path<span class="Delimiter">.</span>at<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>path<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">)</span> << <span class="Constant">" requires computing names of "</span> << r << <span class="Constant">"..ad infinitum</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> -<span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
done<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
path<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
transform_names<span class="Delimiter">(</span>r<span class="Delimiter">);</span> <span class="Comment">// Not passing 'done' through. Might this somehow cause an infinite loop?</span>
assert<span class="Delimiter">(</span>!Name[r]<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
<span class="Identifier">return</span> Name[r][x<span class="Delimiter">.</span>name]<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
recipe_ordinal lookup_surrounding_recipe<span class="Delimiter">(</span><span class="Normal">const</span> recipe_ordinal r<span class="Delimiter">,</span> <span class="Normal">int</span> n<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>n == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span> r<span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"don't know surrounding recipe of '"</span> << get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> -<span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
assert<span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">));</span>
<span class="Identifier">return</span> lookup_surrounding_recipe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">),</span> n-<span class="Constant">1</span><span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Comment">//: weaken use-before-set detection just a tad</span>
<span class="Delimiter">:(replace{} "bool already_transformed(const reagent& r, const map<string, int>& names)")</span>
<span class="Normal">bool</span> already_transformed<span class="Delimiter">(</span><span class="Normal">const</span> reagent& r<span class="Delimiter">,</span> <span class="Normal">const</span> map<string<span class="Delimiter">,</span> <span class="Normal">int</span>>& names<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">"space"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
string_tree* p = property<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">"space"</span><span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!p || !p<span class="Delimiter">-></span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"/space property should have exactly one (non-negative integer) value in '"</span> << r<span class="Delimiter">.</span>original_string << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-></span>value != <span class="Constant">"0"</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> contains_key<span class="Delimiter">(</span>names<span class="Delimiter">,</span> r<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario missing_surrounding_space)</span>
<span class="Special">% Hide_errors = true;</span>
<span class="muRecipe">def</span> f [
local-scope
<span class="Normal">x</span>:num/space:<span class="Constant">1</span><span class="Special"> <- </span>copy <span class="Constant">34</span>
]
<span class="traceContains">+error: don't know surrounding recipe of 'f'</span>
<span class="traceContains">+error: f: can't find a place to store 'x'</span>
<span class="Comment">//: extra test for try_reclaim_locals() from previous layers</span>
<span class="Delimiter">:(scenario local_scope_ignores_nonlocal_spaces)</span>
<span class="muRecipe">def</span> <span class="Normal">new</span>-scope [
<span class="Normal">new</span>-<span class="Normal">default</span>-space
<span class="Normal">x</span>:&:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
*x:&:num<span class="Special"> <- </span>copy <span class="Constant">34</span>
<span class="Identifier">return</span> <span class="Normal">default</span>-space:space
]
<span class="muRecipe">def</span> use-scope [
local-scope
<span class="Normal">outer</span>:space<span class="Special"> <- </span>next-ingredient
<span class="Constant">0</span>:space/names:<span class="Normal">new</span>-scope<span class="Special"> <- </span>copy outer:space
<span class="Identifier">return</span> *x:&:num/space:<span class="Constant">1</span>
]
<span class="muRecipe">def</span> main [
<span class="Constant">1</span>:space/<span class="Special">raw <- </span><span class="Normal">new</span>-scope
<span class="Constant">2</span>:num/<span class="Special">raw <- </span>use-scope <span class="Constant">1</span>:space/<span class="Special">raw</span>
]
<span class="traceContains">+mem: storing 34 in location 2</span>
</pre>
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