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<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: So far we have local variables, and we can nest local variables of short</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">//: lifetimes inside longer ones. Now let's support 'global' variables that</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//: last for the life of a routine. If we create multiple routines they won't</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment">//: have access to each other's globals.</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment">//:</span>
<span id="L6" class="LineNr"> 6 </span><span class="Comment">//: This feature is still experimental and half-baked. You can't name global</span>
<span id="L7" class="LineNr"> 7 </span><span class="Comment">//: variables, and they don't get checked for types (the only known hole in</span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment">//: the type system, can cause memory corruption). We might fix these issues</span>
<span id="L9" class="LineNr"> 9 </span><span class="Comment">//: if we ever use globals. Or we might just drop the feature entirely.</span>
<span id="L10" class="LineNr">10 </span><span class="Comment">//: [tag: todo]</span>
<span id="L11" class="LineNr">11 </span>
<span id="L12" class="LineNr">12 </span><span class="Delimiter">:(scenario global_space)</span>
<span id="L13" class="LineNr">13 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L14" class="LineNr">14 </span> <span class="Comment"># pretend address:array:location; in practice we'll use new</span>
<span id="L15" class="LineNr">15 </span> <span class="Constant">10</span>:num<span class="Special"> <- </span>copy <span class="Constant">0</span> <span class="Comment"># refcount</span>
<span id="L16" class="LineNr">16 </span> <span class="Constant">11</span>:num<span class="Special"> <- </span>copy <span class="Constant">5</span> <span class="Comment"># length</span>
<span id="L17" class="LineNr">17 </span> <span class="Comment"># pretend address:array:location; in practice we'll use new</span>
<span id="L18" class="LineNr">18 </span> <span class="Constant">20</span>:num<span class="Special"> <- </span>copy <span class="Constant">0</span> <span class="Comment"># refcount</span>
<span id="L19" class="LineNr">19 </span> <span class="Constant">21</span>:num<span class="Special"> <- </span>copy <span class="Constant">5</span> <span class="Comment"># length</span>
<span id="L20" class="LineNr">20 </span> <span class="Comment"># actual start of this recipe</span>
<span id="L21" class="LineNr">21 </span> global-space:space<span class="Special"> <- </span>copy <span class="Constant">20</span>/unsafe
<span id="L22" class="LineNr">22 </span> <span class="Normal">default</span>-space:space<span class="Special"> <- </span>copy <span class="Constant">10</span>/unsafe
<span id="L23" class="LineNr">23 </span> <span class="Constant">1</span>:num<span class="Special"> <- </span>copy <span class="Constant">23</span>
<span id="L24" class="LineNr">24 </span> <span class="Special">1:num/space:global</span><span class="Special"> <- </span>copy <span class="Constant">24</span>
<span id="L25" class="LineNr">25 </span>]
<span id="L26" class="LineNr">26 </span><span class="Comment"># store to default space: 10 + (skip refcount and length) 2 + (index) 1</span>
<span id="L27" class="LineNr">27 </span><span class="traceContains">+mem: storing 23 in location 13</span>
<span id="L28" class="LineNr">28 </span><span class="Comment"># store to chained space: (contents of location 12) 20 + (refcount and length) 2 + (index) 1</span>
<span id="L29" class="LineNr">29 </span><span class="traceContains">+mem: storing 24 in location 23</span>
<span id="L30" class="LineNr">30 </span>
<span id="L31" class="LineNr">31 </span><span class="Comment">//: to support it, create another special variable called global space</span>
<span id="L32" class="LineNr">32 </span><span class="Delimiter">:(before "End <a href='042name.cc.html#L99'>is_disqualified</a> Special-cases")</span>
<span id="L33" class="LineNr">33 </span><span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>name == <span class="Constant">"global-space"</span><span class="Delimiter">)</span>
<span id="L34" class="LineNr">34 </span> x<span class="Delimiter">.</span>initialized = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L35" class="LineNr">35 </span><span class="Delimiter">:(before "End <a href='042name.cc.html#L156'>is_special_name</a> Special-cases")</span>
<span id="L36" class="LineNr">36 </span><span class="Normal">if</span> <span class="Delimiter">(</span>s == <span class="Constant">"global-space"</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L37" class="LineNr">37 </span>
<span id="L38" class="LineNr">38 </span><span class="Comment">//: writes to this variable go to a field in the current routine</span>
<span id="L39" class="LineNr">39 </span><span class="Delimiter">:(before "End routine Fields")</span>
<span id="L40" class="LineNr">40 </span><span class="Normal">int</span> global_space<span class="Delimiter">;</span>
<span id="L41" class="LineNr">41 </span><span class="Delimiter">:(before "End routine Constructor")</span>
<span id="L42" class="LineNr">42 </span>global_space = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L43" class="LineNr">43 </span><span class="Delimiter">:(after "Begin Preprocess write_memory(x, data)")</span>
<span id="L44" class="LineNr">44 </span><span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>name == <span class="Constant">"global-space"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L45" class="LineNr">45 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>data<span class="Delimiter">)</span> || !is_space<span class="Delimiter">(</span>x<span class="Delimiter">))</span>
<span id="L46" class="LineNr">46 </span> <a href='003trace.cc.html#L176'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> << <span class="Constant">"'global-space' should be of type <a href='043space.cc.html#L76'>address</a>:array:location, but tried to write '"</span> << to_string<span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L193'>end</a><span class="Delimiter">();</span>
<span id="L47" class="LineNr">47 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>global_space<span class="Delimiter">)</span>
<span id="L48" class="LineNr">48 </span> <a href='003trace.cc.html#L176'>raise</a> << <span class="Constant">"routine already has a global-space; you can't over-write your globals"</span> << end<span class="Delimiter">();</span>
<span id="L49" class="LineNr">49 </span> Current_routine<span class="Delimiter">-></span>global_space = data<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L50" class="LineNr">50 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L51" class="LineNr">51 </span><span class="Delimiter">}</span>
<span id="L52" class="LineNr">52 </span>
<span id="L53" class="LineNr">53 </span><span class="Comment">//: now marking variables as /space:global looks them up inside this field</span>
<span id="L54" class="LineNr">54 </span><span class="Delimiter">:(after "int space_base(const reagent& x)")</span>
<span id="L55" class="LineNr">55 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='046global.cc.html#L79'>is_global</a><span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L56" class="LineNr">56 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-></span>global_space<span class="Delimiter">)</span>
<span id="L57" class="LineNr">57 </span> <a href='003trace.cc.html#L176'>raise</a> << <span class="Constant">"routine has no global space</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L193'>end</a><span class="Delimiter">();</span>
<span id="L58" class="LineNr">58 </span> <span class="Identifier">return</span> Current_routine<span class="Delimiter">-></span>global_space + <span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
<span id="L59" class="LineNr">59 </span> <span class="Delimiter">}</span>
<span id="L60" class="LineNr">60 </span>
<span id="L61" class="LineNr">61 </span><span class="Comment">//: for now let's not bother giving global variables names.</span>
<span id="L62" class="LineNr">62 </span><span class="Comment">//: don't want to make them too comfortable to use.</span>
<span id="L63" class="LineNr">63 </span>
<span id="L64" class="LineNr">64 </span><span class="Delimiter">:(scenario global_space_with_names)</span>
<span id="L65" class="LineNr">65 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L66" class="LineNr">66 </span> global-space:space<span class="Special"> <- </span><span class="Normal">new</span> <span class="Constant">location:type</span><span class="Delimiter">,</span> <span class="Constant">10</span>
<span id="L67" class="LineNr">67 </span> <span class="Normal">x</span>:num<span class="Special"> <- </span>copy <span class="Constant">23</span>
<span id="L68" class="LineNr">68 </span> <span class="Special">1:num/space:global</span><span class="Special"> <- </span>copy <span class="Constant">24</span>
<span id="L69" class="LineNr">69 </span>]
<span id="L70" class="LineNr">70 </span><span class="Comment"># don't complain about mixing numeric addresses and names</span>
<span id="L71" class="LineNr">71 </span>$error: <span class="Constant">0</span>
<span id="L72" class="LineNr">72 </span>
<span id="L73" class="LineNr">73 </span><span class="Delimiter">:(after "bool is_numeric_location(const reagent& x)")</span>
<span id="L74" class="LineNr">74 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='046global.cc.html#L79'>is_global</a><span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span id="L75" class="LineNr">75 </span>
<span id="L76" class="LineNr">76 </span><span class="Comment">//: helpers</span>
<span id="L77" class="LineNr">77 </span>
<span id="L78" class="LineNr">78 </span><span class="Delimiter">:(code)</span>
<span id="L79" class="LineNr">79 </span><span class="Normal">bool</span> <a href='046global.cc.html#L79'>is_global</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent& x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L80" class="LineNr">80 </span> string_tree* s = property<span class="Delimiter">(</span>x<span class="Delimiter">,</span> <span class="Constant">"space"</span><span class="Delimiter">);</span>
<span id="L81" class="LineNr">81 </span> <span class="Identifier">return</span> s && s<span class="Delimiter">-></span>atom && s<span class="Delimiter">-></span>value == <span class="Constant">"global"</span><span class="Delimiter">;</span>
<span id="L82" class="LineNr">82 </span><span class="Delimiter">}</span>
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