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<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Reclaiming memory when it's no longer used.</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span><span class="Delimiter">:(scenario new_reclaim)</span>
<span id="L4" class="LineNr"> 4 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L5" class="LineNr"> 5 </span> <span class="Constant">1</span>:<a href='043space.cc.html#L80'>address</a>:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L6" class="LineNr"> 6 </span> <span class="Constant">2</span>:num<span class="Special"> <- </span>copy <span class="Constant">1</span>:<a href='043space.cc.html#L80'>address</a>:num <span class="Comment"># because 1 will get reset during abandon below</span>
<span id="L7" class="LineNr"> 7 </span> <a href='037abandon.cc.html#L48'>abandon</a> <span class="Constant">1</span>:<a href='043space.cc.html#L80'>address</a>:num
<span id="L8" class="LineNr"> 8 </span> <span class="Constant">3</span>:<a href='043space.cc.html#L80'>address</a>:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span> <span class="Comment"># must be same size as abandoned memory to reuse</span>
<span id="L9" class="LineNr"> 9 </span> <span class="Constant">4</span>:num<span class="Special"> <- </span>copy <span class="Constant">3</span>:<a href='043space.cc.html#L80'>address</a>:num
<span id="L10" class="LineNr"> 10 </span> <span class="Constant">5</span>:<span class="Normal">bool</span><span class="Special"> <- </span>equal <span class="Constant">2</span>:num<span class="Delimiter">,</span> <span class="Constant">4</span>:num
<span id="L11" class="LineNr"> 11 </span>]
<span id="L12" class="LineNr"> 12 </span><span class="Comment"># both allocations should have returned the same address</span>
<span id="L13" class="LineNr"> 13 </span><span class="traceContains">+mem: storing 1 in location 5</span>
<span id="L14" class="LineNr"> 14 </span>
<span id="L15" class="LineNr"> 15 </span><span class="Comment">//: When abandoning addresses we'll save them to a 'free list', segregated by size.</span>
<span id="L16" class="LineNr"> 16 </span>
<span id="L17" class="LineNr"> 17 </span><span class="Delimiter">:(before "End routine Fields")</span>
<span id="L18" class="LineNr"> 18 </span>map<<span class="Normal">int</span><span class="Delimiter">,</span> <span class="Normal">int</span>> free_list<span class="Delimiter">;</span>
<span id="L19" class="LineNr"> 19 </span>
<span id="L20" class="LineNr"> 20 </span><span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
<span id="L21" class="LineNr"> 21 </span>ABANDON<span class="Delimiter">,</span>
<span id="L22" class="LineNr"> 22 </span><span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
<span id="L23" class="LineNr"> 23 </span><a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">"abandon"</span><span class="Delimiter">,</span> ABANDON<span class="Delimiter">);</span>
<span id="L24" class="LineNr"> 24 </span><span class="Delimiter">:(before "End Primitive Recipe Checks")</span>
<span id="L25" class="LineNr"> 25 </span><span class="Normal">case</span> ABANDON: <span class="Delimiter">{</span>
<span id="L26" class="LineNr"> 26 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L27" class="LineNr"> 27 </span> <a href='003trace.cc.html#L174'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"'abandon' shouldn't write to any products in '"</span> << to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L28" class="LineNr"> 28 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L29" class="LineNr"> 29 </span> <span class="Delimiter">}</span>
<span id="L30" class="LineNr"> 30 </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="L31" class="LineNr"> 31 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_address<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="L32" class="LineNr"> 32 </span> <a href='003trace.cc.html#L174'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> << <span class="Constant">"ingredients of 'abandon' should be addresses, but ingredient "</span> << i << <span class="Constant">" is '"</span> << to_string<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="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L33" class="LineNr"> 33 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L34" class="LineNr"> 34 </span> <span class="Delimiter">}</span>
<span id="L35" class="LineNr"> 35 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L36" class="LineNr"> 36 </span><span class="Delimiter">}</span>
<span id="L37" class="LineNr"> 37 </span><span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
<span id="L38" class="LineNr"> 38 </span><span class="Normal">case</span> ABANDON: <span class="Delimiter">{</span>
<span id="L39" class="LineNr"> 39 </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><a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L40" class="LineNr"> 40 </span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> ingredient = <a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L41" class="LineNr"> 41 </span> canonize<span class="Delimiter">(</span>ingredient<span class="Delimiter">);</span>
<span id="L42" class="LineNr"> 42 </span> <a href='037abandon.cc.html#L48'>abandon</a><span class="Delimiter">(</span><a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> ingredient<span class="Delimiter">.</span>value<span class="Delimiter">),</span> <a href='037abandon.cc.html#L58'>payload_size</a><span class="Delimiter">(</span>ingredient<span class="Delimiter">));</span>
<span id="L43" class="LineNr"> 43 </span> <span class="Delimiter">}</span>
<span id="L44" class="LineNr"> 44 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L45" class="LineNr"> 45 </span><span class="Delimiter">}</span>
<span id="L46" class="LineNr"> 46 </span>
<span id="L47" class="LineNr"> 47 </span><span class="Delimiter">:(code)</span>
<span id="L48" class="LineNr"> 48 </span><span class="Normal">void</span> <a href='037abandon.cc.html#L48'>abandon</a><span class="Delimiter">(</span><span class="Normal">int</span> <a href='043space.cc.html#L80'>address</a><span class="Delimiter">,</span> <span class="Normal">int</span> <a href='037abandon.cc.html#L58'>payload_size</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L49" class="LineNr"> 49 </span> <span class="Comment">// clear memory</span>
<span id="L50" class="LineNr"> 50 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> curr = <a href='043space.cc.html#L80'>address</a><span class="Delimiter">;</span> curr < address+payload_size<span class="Delimiter">;</span> ++curr<span class="Delimiter">)</span>
<span id="L51" class="LineNr"> 51 </span> <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L52" class="LineNr"> 52 </span> <span class="Comment">// append existing free list to address</span>
<span id="L53" class="LineNr"> 53 </span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"abandon"</span><span class="Delimiter">)</span> << <span class="Constant">"saving "</span> << <a href='043space.cc.html#L80'>address</a> << <span class="Constant">" in free-list of size "</span> << <a href='037abandon.cc.html#L58'>payload_size</a> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span>
<span id="L54" class="LineNr"> 54 </span> <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L80'>address</a><span class="Delimiter">,</span> <a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>free_list<span class="Delimiter">,</span> <a href='037abandon.cc.html#L58'>payload_size</a><span class="Delimiter">));</span>
<span id="L55" class="LineNr"> 55 </span> <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>free_list<span class="Delimiter">,</span> <a href='037abandon.cc.html#L58'>payload_size</a><span class="Delimiter">,</span> <a href='043space.cc.html#L80'>address</a><span class="Delimiter">);</span>
<span id="L56" class="LineNr"> 56 </span><span class="Delimiter">}</span>
<span id="L57" class="LineNr"> 57 </span>
<span id="L58" class="LineNr"> 58 </span><span class="Normal">int</span> <a href='037abandon.cc.html#L58'>payload_size</a><span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L59" class="LineNr"> 59 </span> x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair<string<span class="Delimiter">,</span> string_tree*><span class="Delimiter">(</span><span class="Constant">"lookup"</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
<span id="L60" class="LineNr"> 60 </span> lookup_memory_core<span class="Delimiter">(</span>x<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">check_for_null</span><span class="Comment">*/</span><span class="Constant">false</span><span class="Delimiter">);</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Identifier">return</span> size_of<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
<span id="L62" class="LineNr"> 62 </span><span class="Delimiter">}</span>
<span id="L63" class="LineNr"> 63 </span>
<span id="L64" class="LineNr"> 64 </span><span class="Delimiter">:(after "Allocate Special-cases")</span>
<span id="L65" class="LineNr"> 65 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>free_list<span class="Delimiter">,</span> size<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L66" class="LineNr"> 66 </span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"abandon"</span><span class="Delimiter">)</span> << <span class="Constant">"picking up space from free-list of size "</span> << size << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span>
<span id="L67" class="LineNr"> 67 </span> <span class="Normal">int</span> result = <a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>free_list<span class="Delimiter">,</span> size<span class="Delimiter">);</span>
<span id="L68" class="LineNr"> 68 </span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"mem"</span><span class="Delimiter">)</span> << <span class="Constant">"new alloc from free list: "</span> << result << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span>
<span id="L69" class="LineNr"> 69 </span> <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>free_list<span class="Delimiter">,</span> size<span class="Delimiter">,</span> <a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> result<span class="Delimiter">));</span>
<span id="L70" class="LineNr"> 70 </span> <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> result<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L71" class="LineNr"> 71 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> curr = result<span class="Delimiter">;</span> curr < result+size<span class="Delimiter">;</span> ++curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L72" class="LineNr"> 72 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)</span> != <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L73" class="LineNr"> 73 </span> <a href='003trace.cc.html#L174'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span><a href='026call.cc.html#L87'>current_recipe_name</a><span class="Delimiter">())</span> << <span class="Constant">"memory in free list was not zeroed out: "</span> << curr << <span class="Constant">'/'</span> << result << <span class="Constant">"; somebody wrote to us after free!!!</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span>
<span id="L74" class="LineNr"> 74 </span> <span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// always fatal</span>
<span id="L75" class="LineNr"> 75 </span> <span class="Delimiter">}</span>
<span id="L76" class="LineNr"> 76 </span> <span class="Delimiter">}</span>
<span id="L77" class="LineNr"> 77 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L78" class="LineNr"> 78 </span><span class="Delimiter">}</span>
<span id="L79" class="LineNr"> 79 </span>
<span id="L80" class="LineNr"> 80 </span><span class="Delimiter">:(scenario new_differing_size_no_reclaim)</span>
<span id="L81" class="LineNr"> 81 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L82" class="LineNr"> 82 </span> <span class="Constant">1</span>:<a href='043space.cc.html#L80'>address</a>:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L83" class="LineNr"> 83 </span> <span class="Constant">2</span>:num<span class="Special"> <- </span>copy <span class="Constant">1</span>:<a href='043space.cc.html#L80'>address</a>:num
<span id="L84" class="LineNr"> 84 </span> <a href='037abandon.cc.html#L48'>abandon</a> <span class="Constant">1</span>:<a href='043space.cc.html#L80'>address</a>:num
<span id="L85" class="LineNr"> 85 </span> <span class="Constant">3</span>:<a href='043space.cc.html#L80'>address</a>:array:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span><span class="Delimiter">,</span> <span class="Constant">2</span> <span class="Comment"># different size</span>
<span id="L86" class="LineNr"> 86 </span> <span class="Constant">4</span>:num<span class="Special"> <- </span>copy <span class="Constant">3</span>:<a href='043space.cc.html#L80'>address</a>:array:num
<span id="L87" class="LineNr"> 87 </span> <span class="Constant">5</span>:<span class="Normal">bool</span><span class="Special"> <- </span>equal <span class="Constant">2</span>:num<span class="Delimiter">,</span> <span class="Constant">4</span>:num
<span id="L88" class="LineNr"> 88 </span>]
<span id="L89" class="LineNr"> 89 </span><span class="Comment"># no reuse</span>
<span id="L90" class="LineNr"> 90 </span><span class="traceContains">+mem: storing 0 in location 5</span>
<span id="L91" class="LineNr"> 91 </span>
<span id="L92" class="LineNr"> 92 </span><span class="Delimiter">:(scenario new_reclaim_array)</span>
<span id="L93" class="LineNr"> 93 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L94" class="LineNr"> 94 </span> <span class="Constant">1</span>:<a href='043space.cc.html#L80'>address</a>:array:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span><span class="Delimiter">,</span> <span class="Constant">2</span>
<span id="L95" class="LineNr"> 95 </span> <span class="Constant">2</span>:num<span class="Special"> <- </span>copy <span class="Constant">1</span>:<a href='043space.cc.html#L80'>address</a>:array:num
<span id="L96" class="LineNr"> 96 </span> <a href='037abandon.cc.html#L48'>abandon</a> <span class="Constant">1</span>:<a href='043space.cc.html#L80'>address</a>:array:num
<span id="L97" class="LineNr"> 97 </span> <span class="Constant">3</span>:<a href='043space.cc.html#L80'>address</a>:array:num<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">number:type</span><span class="Delimiter">,</span> <span class="Constant">2</span> <span class="Comment"># same size</span>
<span id="L98" class="LineNr"> 98 </span> <span class="Constant">4</span>:num<span class="Special"> <- </span>copy <span class="Constant">3</span>:<a href='043space.cc.html#L80'>address</a>:array:num
<span id="L99" class="LineNr"> 99 </span> <span class="Constant">5</span>:<span class="Normal">bool</span><span class="Special"> <- </span>equal <span class="Constant">2</span>:num<span class="Delimiter">,</span> <span class="Constant">4</span>:num
<span id="L100" class="LineNr">100 </span>]
<span id="L101" class="LineNr">101 </span><span class="Comment"># both calls to new returned identical addresses</span>
<span id="L102" class="LineNr">102 </span><span class="traceContains">+mem: storing 1 in location 5</span>
</pre>
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