diff options
| author | Kartik K. Agaram <vc@akkartik.com> | 2017-12-15 02:09:36 -0800 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2017-12-15 02:09:36 -0800 |
| commit | fe8bf967a945c7d9e6aba36e42518262d54bd348 (patch) | |
| tree | d8693470d0695508dd650d1b9b836fbeae79394c /html/076continuation.cc.html | |
| parent | 5059f32d0ddf36b9591ad0c14ee474ad5f2f8816 (diff) | |
| download | mu-fe8bf967a945c7d9e6aba36e42518262d54bd348.tar.gz | |
4161
Diffstat (limited to 'html/076continuation.cc.html')
| -rw-r--r-- | html/076continuation.cc.html | 609 |
1 files changed, 329 insertions, 280 deletions
diff --git a/html/076continuation.cc.html b/html/076continuation.cc.html index eca16757..00b353f9 100644 --- a/html/076continuation.cc.html +++ b/html/076continuation.cc.html @@ -3,7 +3,7 @@ <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Mu - 076continuation.cc</title> -<meta name="Generator" content="Vim/7.4"> +<meta name="Generator" content="Vim/8.0"> <meta name="plugin-version" content="vim7.4_v2"> <meta name="syntax" content="cpp"> <meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> @@ -15,19 +15,19 @@ body { font-size: 12pt; font-family: monospace; color: #aaaaaa; background-color a { color:#eeeeee; text-decoration: none; } a:hover { text-decoration: underline; } * { font-size: 12pt; font-size: 1em; } -.Constant { color: #00a0a0; } -.muRecipe { color: #ff8700; } -.Special { color: #c00000; } -.Conceal { color: #4e4e4e; } .traceAbsent { color: #c00000; } -.Comment { color: #9090ff; } -.Comment a { color:#0000ee; text-decoration:underline; } -.Delimiter { color: #800080; } +.Conceal { color: #4e4e4e; } +.traceContains { color: #008000; } .LineNr { color: #444444; } .Identifier { color: #c0a020; } +.Constant { color: #00a0a0; } .Normal { color: #aaaaaa; background-color: #080808; padding-bottom: 1px; } +.Comment { color: #9090ff; } +.Comment a { color:#0000ee; text-decoration:underline; } +.Delimiter { color: #800080; } +.Special { color: #c00000; } .cSpecial { color: #008000; } -.traceContains { color: #008000; } +.muRecipe { color: #ff8700; } --> </style> @@ -115,7 +115,7 @@ if ('onhashchange' in window) { <span id="L51" class="LineNr"> 51 </span>Type[continuation]<span class="Delimiter">.</span>name = <span class="Constant">"continuation"</span><span class="Delimiter">;</span> <span id="L52" class="LineNr"> 52 </span> <span id="L53" class="LineNr"> 53 </span><span class="Comment">//: A continuation can be called like a recipe.</span> -<span id="L54" class="LineNr"> 54 </span><span class="Delimiter">:(before "End <a href='072recipe.cc.html#L345'>is_mu_recipe</a> Atom Cases(r)")</span> +<span id="L54" class="LineNr"> 54 </span><span class="Delimiter">:(before "End <a href='072recipe.cc.html#L343'>is_mu_recipe</a> Atom Cases(r)")</span> <span id="L55" class="LineNr"> 55 </span><span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">-></span>name == <span class="Constant">"continuation"</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span> <span id="L56" class="LineNr"> 56 </span> <span id="L57" class="LineNr"> 57 </span><span class="Comment">//: However, it can't be type-checked like most recipes. Pretend it's like a</span> @@ -128,7 +128,7 @@ if ('onhashchange' in window) { <span id="L64" class="LineNr"> 64 </span> <span id="L65" class="LineNr"> 65 </span><span class="Delimiter">:(scenario delimited_continuation)</span> <span id="L66" class="LineNr"> 66 </span><span class="muRecipe"><a href='010vm.cc.html#L19'>recipe</a></span> <a href='000organization.cc.html#L113'>main</a> [ -<span id="L67" class="LineNr"> 67 </span> <span class="Constant">1</span>:continuation<span class="Special"> <- </span>call-with-continuation-mark f<span class="Delimiter">,</span> <span class="Constant">77</span> <span class="Comment"># 77 is an argument to f</span> +<span id="L67" class="LineNr"> 67 </span> <span class="Constant">1</span>:continuation<span class="Special"> <- </span>call-with-continuation-mark <span class="Constant">233</span>/mark<span class="Delimiter">,</span> f<span class="Delimiter">,</span> <span class="Constant">77</span> <span class="Comment"># 77 is an argument to f</span> <span id="L68" class="LineNr"> 68 </span> <span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">5</span> <span id="L69" class="LineNr"> 69 </span> <span class="Delimiter">{</span> <span id="L70" class="LineNr"> 70 </span> <span class="Conceal">¦</span> <span class="Constant">2</span>:number<span class="Special"> <- </span>call <span class="Constant">1</span>:continuation<span class="Delimiter">,</span> <span class="Constant">2</span>:number <span class="Comment"># jump to 'return-continuation-until-mark' below</span> @@ -144,7 +144,7 @@ if ('onhashchange' in window) { <span id="L80" class="LineNr"> 80 </span>] <span id="L81" class="LineNr"> 81 </span><span class="muRecipe"><a href='010vm.cc.html#L19'>recipe</a></span> g [ <span id="L82" class="LineNr"> 82 </span> <span class="Constant">21</span>:number<span class="Special"> <- </span>next-ingredient -<span id="L83" class="LineNr"> 83 </span> <span class="Constant">22</span>:number<span class="Special"> <- </span><span class="Identifier">return</span>-continuation-until-mark +<span id="L83" class="LineNr"> 83 </span> <span class="Constant">22</span>:number<span class="Special"> <- </span><span class="Identifier">return</span>-continuation-until-mark <span class="Constant">233</span>/mark <span id="L84" class="LineNr"> 84 </span> <span class="Constant">23</span>:number<span class="Special"> <- </span>add <span class="Constant">22</span>:number<span class="Delimiter">,</span> <span class="Constant">1</span> <span id="L85" class="LineNr"> 85 </span> <span class="Identifier">return</span> <span class="Constant">23</span>:number <span id="L86" class="LineNr"> 86 </span>] @@ -172,9 +172,9 @@ if ('onhashchange' in window) { <span id="L108" class="LineNr">108 </span><span class="traceAbsent">-mem: storing 9 in location 2</span> <span id="L109" class="LineNr">109 </span> <span id="L110" class="LineNr">110 </span><span class="Delimiter">:(before "End call Fields")</span> -<span id="L111" class="LineNr">111 </span><span class="Normal">bool</span> is_base_of_continuation<span class="Delimiter">;</span> +<span id="L111" class="LineNr">111 </span><span class="Normal">int</span> is_base_of_continuation<span class="Delimiter">;</span> <span id="L112" class="LineNr">112 </span><span class="Delimiter">:(before "End call Constructor")</span> -<span id="L113" class="LineNr">113 </span>is_base_of_continuation = <span class="Constant">false</span><span class="Delimiter">;</span> +<span id="L113" class="LineNr">113 </span>is_base_of_continuation = <span class="Constant">0</span><span class="Delimiter">;</span> <span id="L114" class="LineNr">114 </span> <span id="L115" class="LineNr">115 </span><span class="Delimiter">:(before "End Primitive Recipe Declarations")</span> <span id="L116" class="LineNr">116 </span>CALL_WITH_CONTINUATION_MARK<span class="Delimiter">,</span> @@ -194,272 +194,321 @@ if ('onhashchange' in window) { <span id="L130" class="LineNr">130 </span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-></span>callstack_depth < <span class="Constant">9000</span><span class="Delimiter">);</span> <span class="Comment">// 9998-101 plus cushion</span> <span id="L131" class="LineNr">131 </span> <span class="Delimiter">}</span> <span id="L132" class="LineNr">132 </span> <span class="Normal">const</span> instruction& caller_instruction = <a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">();</span> -<span id="L133" class="LineNr">133 </span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>is_base_of_continuation = <span class="Constant">true</span><span class="Delimiter">;</span> -<span id="L134" class="LineNr">134 </span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>call<span class="Delimiter">(</span>Recipe_ordinal[current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name]<span class="Delimiter">));</span> -<span id="L135" class="LineNr">135 </span> ingredients<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">());</span> <span class="Comment">// drop the callee</span> -<span id="L136" class="LineNr">136 </span> finish_call_housekeeping<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">,</span> ingredients<span class="Delimiter">);</span> -<span id="L137" class="LineNr">137 </span> <span class="Identifier">continue</span><span class="Delimiter">;</span> -<span id="L138" class="LineNr">138 </span><span class="Delimiter">}</span> -<span id="L139" class="LineNr">139 </span> -<span id="L140" class="LineNr">140 </span><span class="Comment">//: save the slice of current call stack until the 'call-with-continuation-mark'</span> -<span id="L141" class="LineNr">141 </span><span class="Comment">//: call, and return it as the result.</span> -<span id="L142" class="LineNr">142 </span><span class="Comment">//: todo: implement delimited continuations in Mu's memory</span> -<span id="L143" class="LineNr">143 </span><span class="Delimiter">:(before "End Types")</span> -<span id="L144" class="LineNr">144 </span><span class="Normal">struct</span> delimited_continuation <span class="Delimiter">{</span> -<span id="L145" class="LineNr">145 </span> call_stack frames<span class="Delimiter">;</span> -<span id="L146" class="LineNr">146 </span> <span class="Normal">int</span> nrefs<span class="Delimiter">;</span> -<span id="L147" class="LineNr">147 </span> delimited_continuation<span class="Delimiter">(</span>call_stack::iterator begin<span class="Delimiter">,</span> call_stack::iterator <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">)</span> :frames<span class="Delimiter">(</span>call_stack<span class="Delimiter">(</span>begin<span class="Delimiter">,</span> <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">)),</span> nrefs<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{}</span> -<span id="L148" class="LineNr">148 </span><span class="Delimiter">};</span> -<span id="L149" class="LineNr">149 </span><span class="Delimiter">:(before "End Globals")</span> -<span id="L150" class="LineNr">150 </span>map<<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span><span class="Delimiter">,</span> delimited_continuation> Delimited_continuation<span class="Delimiter">;</span> -<span id="L151" class="LineNr">151 </span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> Next_delimited_continuation_id = <span class="Constant">1</span><span class="Delimiter">;</span> <span class="Comment">// 0 is null just like an address</span> -<span id="L152" class="LineNr">152 </span><span class="Delimiter">:(before "End Reset")</span> -<span id="L153" class="LineNr">153 </span>Delimited_continuation<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span> -<span id="L154" class="LineNr">154 </span>Next_delimited_continuation_id = <span class="Constant">1</span><span class="Delimiter">;</span> -<span id="L155" class="LineNr">155 </span> -<span id="L156" class="LineNr">156 </span><span class="Delimiter">:(before "End Primitive Recipe Declarations")</span> -<span id="L157" class="LineNr">157 </span>RETURN_CONTINUATION_UNTIL_MARK<span class="Delimiter">,</span> -<span id="L158" class="LineNr">158 </span><span class="Delimiter">:(before "End Primitive Recipe Numbers")</span> -<span id="L159" class="LineNr">159 </span>Recipe_ordinal[<span class="Constant">"return-continuation-until-mark"</span>] = RETURN_CONTINUATION_UNTIL_MARK<span class="Delimiter">;</span> -<span id="L160" class="LineNr">160 </span><span class="Delimiter">:(before "End Primitive Recipe Checks")</span> -<span id="L161" class="LineNr">161 </span><span class="Normal">case</span> RETURN_CONTINUATION_UNTIL_MARK: <span class="Delimiter">{</span> -<span id="L162" class="LineNr">162 </span> <span class="Identifier">break</span><span class="Delimiter">;</span> -<span id="L163" class="LineNr">163 </span><span class="Delimiter">}</span> -<span id="L164" class="LineNr">164 </span><span class="Delimiter">:(before "End Primitive Recipe Implementations")</span> -<span id="L165" class="LineNr">165 </span><span class="Normal">case</span> RETURN_CONTINUATION_UNTIL_MARK: <span class="Delimiter">{</span> -<span id="L166" class="LineNr">166 </span> <span class="Comment">// I don't know how to think about next-ingredient in combination with</span> -<span id="L167" class="LineNr">167 </span> <span class="Comment">// continuations, so seems cleaner to just kill it. Functions have to read</span> -<span id="L168" class="LineNr">168 </span> <span class="Comment">// their inputs before ever returning a continuation.</span> -<span id="L169" class="LineNr">169 </span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span> -<span id="L170" class="LineNr">170 </span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>next_ingredient_to_process = <span class="Constant">0</span><span class="Delimiter">;</span> -<span id="L171" class="LineNr">171 </span> <span class="Comment">// copy the current call stack until the most recent marked call</span> -<span id="L172" class="LineNr">172 </span> call_stack::iterator find_base_of_continuation<span class="Delimiter">(</span>call_stack& c<span class="Delimiter">);</span> <span class="Comment">// manual prototype containing '::'</span> -<span id="L173" class="LineNr">173 </span> call_stack::iterator base = find_base_of_continuation<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">);</span> -<span id="L174" class="LineNr">174 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>base == Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span> -<span id="L175" class="LineNr">175 </span> <span class="Conceal">¦</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">"couldn't find a 'call-with-continuation-mark' to return to</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span> -<span id="L176" class="LineNr">176 </span> <span class="Conceal">¦</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">"call stack:</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> -<span id="L177" class="LineNr">177 </span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>call_stack::iterator p = Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> -<span id="L178" class="LineNr">178 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</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">" "</span> << get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> p<span class="Delimiter">-></span>running_recipe<span class="Delimiter">).</span>name << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> -<span id="L179" class="LineNr">179 </span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span> -<span id="L180" class="LineNr">180 </span> <span class="Delimiter">}</span> -<span id="L181" class="LineNr">181 </span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"creating continuation "</span> << Next_delimited_continuation_id << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> -<span id="L182" class="LineNr">182 </span> <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> Next_delimited_continuation_id<span class="Delimiter">,</span> delimited_continuation<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> base<span class="Delimiter">));</span> -<span id="L183" class="LineNr">183 </span> <span class="Normal">while</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>begin<span class="Delimiter">()</span> != base<span class="Delimiter">)</span> <span class="Delimiter">{</span> -<span id="L184" class="LineNr">184 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span> -<span id="L185" class="LineNr">185 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> --Trace_stream<span class="Delimiter">-></span>callstack_depth<span class="Delimiter">;</span> -<span id="L186" class="LineNr">186 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-></span>callstack_depth >= <span class="Constant">0</span><span class="Delimiter">);</span> -<span id="L187" class="LineNr">187 </span> <span class="Conceal">¦</span> <span class="Delimiter">}</span> -<span id="L188" class="LineNr">188 </span> <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>pop_front<span class="Delimiter">();</span> -<span id="L189" class="LineNr">189 </span> <span class="Delimiter">}</span> -<span id="L190" class="LineNr">190 </span> <span class="Comment">// return it as the result of the marked call</span> -<span id="L191" class="LineNr">191 </span> products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span> -<span id="L192" class="LineNr">192 </span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>Next_delimited_continuation_id<span class="Delimiter">);</span> -<span id="L193" class="LineNr">193 </span> <span class="Comment">// return any other ingredients passed in</span> -<span id="L194" class="LineNr">194 </span> copy<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> ingredients<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">(),</span> inserter<span class="Delimiter">(</span>products<span class="Delimiter">,</span> products<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">()));</span> -<span id="L195" class="LineNr">195 </span> ++Next_delimited_continuation_id<span class="Delimiter">;</span> -<span id="L196" class="LineNr">196 </span> <span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// continue to process rest of marked call</span> -<span id="L197" class="LineNr">197 </span><span class="Delimiter">}</span> -<span id="L198" class="LineNr">198 </span> -<span id="L199" class="LineNr">199 </span><span class="Delimiter">:(code)</span> -<span id="L200" class="LineNr">200 </span>call_stack::iterator find_base_of_continuation<span class="Delimiter">(</span>call_stack& c<span class="Delimiter">)</span> <span class="Delimiter">{</span> -<span id="L201" class="LineNr">201 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>call_stack::iterator p = c<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != c<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> -<span id="L202" class="LineNr">202 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-></span>is_base_of_continuation<span class="Delimiter">)</span> <span class="Identifier">return</span> p<span class="Delimiter">;</span> -<span id="L203" class="LineNr">203 </span> <span class="Identifier">return</span> c<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> -<span id="L204" class="LineNr">204 </span><span class="Delimiter">}</span> -<span id="L205" class="LineNr">205 </span> -<span id="L206" class="LineNr">206 </span><span class="Comment">//: overload 'call' for continuations</span> -<span id="L207" class="LineNr">207 </span><span class="Delimiter">:(after "Begin Call")</span> -<span id="L208" class="LineNr">208 </span><span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_continuation<span class="Delimiter">(</span><a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span> -<span id="L209" class="LineNr">209 </span> <span class="Comment">// copy multiple calls on to current call stack</span> -<span id="L210" class="LineNr">210 </span> assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span> -<span id="L211" class="LineNr">211 </span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"calling continuation "</span> << ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> -<span id="L212" class="LineNr">212 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> -<span id="L213" class="LineNr">213 </span> <span class="Conceal">¦</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">"no such delimited continuation "</span> << <a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> -<span id="L214" class="LineNr">214 </span> <span class="Normal">const</span> call_stack& new_frames = get<span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)).</span>frames<span class="Delimiter">;</span> -<span id="L215" class="LineNr">215 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>call_stack::const_reverse_iterator p = new_frames<span class="Delimiter">.</span>rbegin<span class="Delimiter">();</span> p != new_frames<span class="Delimiter">.</span>rend<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span> -<span id="L216" class="LineNr">216 </span> <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>*p<span class="Delimiter">);</span> -<span id="L217" class="LineNr">217 </span> <span class="Conceal">¦</span> <span class="Comment">// ensure that the presence of a continuation keeps its stack frames from being reclaimed</span> -<span id="L218" class="LineNr">218 </span> <span class="Conceal">¦</span> <a href='036refcount.cc.html#L50'>increment_refcount</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>default_space<span class="Delimiter">);</span> -<span id="L219" class="LineNr">219 </span> <span class="Delimiter">}</span> -<span id="L220" class="LineNr">220 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span> -<span id="L221" class="LineNr">221 </span> <span class="Conceal">¦</span> Trace_stream<span class="Delimiter">-></span>callstack_depth += <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>new_frames<span class="Delimiter">);</span> -<span id="L222" class="LineNr">222 </span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"trace"</span><span class="Delimiter">)</span> << <span class="Constant">"calling delimited continuation; growing callstack depth to "</span> << Trace_stream<span class="Delimiter">-></span>callstack_depth << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> -<span id="L223" class="LineNr">223 </span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-></span>callstack_depth < <span class="Constant">9000</span><span class="Delimiter">);</span> <span class="Comment">// 9998-101 plus cushion</span> -<span id="L224" class="LineNr">224 </span> <span class="Delimiter">}</span> -<span id="L225" class="LineNr">225 </span> <span class="Comment">// no call housekeeping; continuations don't support next-ingredient</span> -<span id="L226" class="LineNr">226 </span> copy<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">drop continuation</span><span class="Comment">*/</span>++ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> ingredients<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><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 id="L227" class="LineNr">227 </span> <span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// record results of resuming 'return-continuation-until-mark' instruction</span> -<span id="L228" class="LineNr">228 </span><span class="Delimiter">}</span> -<span id="L229" class="LineNr">229 </span> -<span id="L230" class="LineNr">230 </span><span class="Delimiter">:(scenario continuations_can_return_values)</span> -<span id="L231" class="LineNr">231 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [ -<span id="L232" class="LineNr">232 </span> local-scope -<span id="L233" class="LineNr">233 </span> <span class="Normal">k</span>:continuation<span class="Delimiter">,</span> <span class="Constant">1</span>:num/<span class="Special">raw <- </span>call-with-continuation-mark f -<span id="L234" class="LineNr">234 </span>] -<span id="L235" class="LineNr">235 </span><span class="muRecipe">def</span> f [ -<span id="L236" class="LineNr">236 </span> local-scope -<span id="L237" class="LineNr">237 </span> g -<span id="L238" class="LineNr">238 </span>] -<span id="L239" class="LineNr">239 </span><span class="muRecipe">def</span> g [ -<span id="L240" class="LineNr">240 </span> local-scope -<span id="L241" class="LineNr">241 </span> <span class="Identifier">return</span>-continuation-until-mark <span class="Constant">34</span> -<span id="L242" class="LineNr">242 </span> stash [continuation called] -<span id="L243" class="LineNr">243 </span>] -<span id="L244" class="LineNr">244 </span><span class="Comment"># entering main</span> -<span id="L245" class="LineNr">245 </span><span class="traceContains">+mem: new alloc: 1000</span> -<span id="L246" class="LineNr">246 </span><span class="traceContains">+run: {k: "continuation"}, {1: "number", "raw": ()} <- call-with-continuation-mark {f: "recipe-literal"}</span> -<span id="L247" class="LineNr">247 </span><span class="Comment"># entering f</span> -<span id="L248" class="LineNr">248 </span><span class="traceContains">+mem: new alloc: 1004</span> -<span id="L249" class="LineNr">249 </span><span class="Comment"># entering g</span> -<span id="L250" class="LineNr">250 </span><span class="traceContains">+mem: new alloc: 1007</span> -<span id="L251" class="LineNr">251 </span><span class="Comment"># return control to main</span> -<span id="L252" class="LineNr">252 </span><span class="traceContains">+run: return-continuation-until-mark {34: "literal"}</span> -<span id="L253" class="LineNr">253 </span><span class="Comment"># no allocs abandoned yet</span> -<span id="L254" class="LineNr">254 </span><span class="traceContains">+mem: storing 34 in location 1</span> -<span id="L255" class="LineNr">255 </span><span class="Comment"># end of main</span> -<span id="L256" class="LineNr">256 </span><span class="Comment"># make sure no memory leaks..</span> -<span id="L257" class="LineNr">257 </span><span class="traceContains">+mem: trying to reclaim local k:continuation</span> -<span id="L258" class="LineNr">258 </span><span class="traceContains">+mem: automatically abandoning 1007</span> -<span id="L259" class="LineNr">259 </span><span class="traceContains">+mem: automatically abandoning 1004</span> -<span id="L260" class="LineNr">260 </span><span class="traceContains">+mem: automatically abandoning 1000</span> -<span id="L261" class="LineNr">261 </span><span class="Comment"># ..even though we never called the continuation</span> -<span id="L262" class="LineNr">262 </span><span class="traceAbsent">-app: continuation called</span> -<span id="L263" class="LineNr">263 </span> -<span id="L264" class="LineNr">264 </span><span class="Comment">//: Allow shape-shifting recipes to return continuations.</span> -<span id="L265" class="LineNr">265 </span> -<span id="L266" class="LineNr">266 </span><span class="Delimiter">:(scenario call_shape_shifting_recipe_with_continuation_mark)</span> -<span id="L267" class="LineNr">267 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [ -<span id="L268" class="LineNr">268 </span> <span class="Constant">1</span>:num<span class="Special"> <- </span>call-with-continuation-mark f<span class="Delimiter">,</span> <span class="Constant">34</span> -<span id="L269" class="LineNr">269 </span>] -<span id="L270" class="LineNr">270 </span><span class="muRecipe">def</span> f x:_elem<span class="muRecipe"> -> </span>y:_elem [ -<span id="L271" class="LineNr">271 </span> local-scope -<span id="L272" class="LineNr">272 </span> load-ingredients -<span id="L273" class="LineNr">273 </span> y<span class="Special"> <- </span>copy x -<span id="L274" class="LineNr">274 </span>] -<span id="L275" class="LineNr">275 </span><span class="traceContains">+mem: storing 34 in location 1</span> -<span id="L276" class="LineNr">276 </span> -<span id="L277" class="LineNr">277 </span><span class="Delimiter">:(before "End resolve_ambiguous_call(r, index, inst, caller_recipe) Special-cases")</span> -<span id="L278" class="LineNr">278 </span><span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">"call-with-continuation-mark"</span> && <a href='072recipe.cc.html#L213'>first_ingredient_is_recipe_literal</a><span class="Delimiter">(</span>inst<span class="Delimiter">))</span> <span class="Delimiter">{</span> -<span id="L279" class="LineNr">279 </span> <a href='072recipe.cc.html#L218'>resolve_indirect_ambiguous_call</a><span class="Delimiter">(</span>r<span class="Delimiter">,</span> index<span class="Delimiter">,</span> inst<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">);</span> -<span id="L280" class="LineNr">280 </span> <span class="Identifier">return</span><span class="Delimiter">;</span> -<span id="L281" class="LineNr">281 </span><span class="Delimiter">}</span> -<span id="L282" class="LineNr">282 </span> -<span id="L283" class="LineNr">283 </span><span class="Delimiter">:(scenario call_shape_shifting_recipe_with_continuation_mark_and_no_outputs)</span> -<span id="L284" class="LineNr">284 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [ -<span id="L285" class="LineNr">285 </span> <span class="Constant">1</span>:continuation<span class="Special"> <- </span>call-with-continuation-mark f<span class="Delimiter">,</span> <span class="Constant">34</span> -<span id="L286" class="LineNr">286 </span>] -<span id="L287" class="LineNr">287 </span><span class="muRecipe">def</span> f x:_elem [ -<span id="L288" class="LineNr">288 </span> local-scope -<span id="L289" class="LineNr">289 </span> load-ingredients -<span id="L290" class="LineNr">290 </span> <span class="Identifier">return</span>-continuation-until-mark -<span id="L291" class="LineNr">291 </span>] -<span id="L292" class="LineNr">292 </span>$error: <span class="Constant">0</span> -<span id="L293" class="LineNr">293 </span> -<span id="L294" class="LineNr">294 </span><span class="Comment">//: Ensure that the presence of a continuation keeps its stack frames from being reclaimed.</span> -<span id="L295" class="LineNr">295 </span> -<span id="L296" class="LineNr">296 </span><span class="Delimiter">:(scenario continuations_preserve_local_scopes)</span> -<span id="L297" class="LineNr">297 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [ -<span id="L298" class="LineNr">298 </span> local-scope -<span id="L299" class="LineNr">299 </span> <span class="Normal">k</span>:continuation<span class="Special"> <- </span>call-with-continuation-mark f -<span id="L300" class="LineNr">300 </span> call k -<span id="L301" class="LineNr">301 </span> <span class="Identifier">return</span> <span class="Constant">34</span> -<span id="L302" class="LineNr">302 </span>] -<span id="L303" class="LineNr">303 </span><span class="muRecipe">def</span> f [ -<span id="L304" class="LineNr">304 </span> local-scope -<span id="L305" class="LineNr">305 </span> g -<span id="L306" class="LineNr">306 </span>] -<span id="L307" class="LineNr">307 </span><span class="muRecipe">def</span> g [ -<span id="L308" class="LineNr">308 </span> local-scope -<span id="L309" class="LineNr">309 </span> <span class="Identifier">return</span>-continuation-until-mark -<span id="L310" class="LineNr">310 </span> add <span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">1</span> -<span id="L311" class="LineNr">311 </span>] -<span id="L312" class="LineNr">312 </span><span class="Comment"># entering main</span> -<span id="L313" class="LineNr">313 </span><span class="traceContains">+mem: new alloc: 1000</span> -<span id="L314" class="LineNr">314 </span><span class="traceContains">+run: {k: "continuation"} <- call-with-continuation-mark {f: "recipe-literal"}</span> -<span id="L315" class="LineNr">315 </span><span class="Comment"># entering f</span> -<span id="L316" class="LineNr">316 </span><span class="traceContains">+mem: new alloc: 1004</span> -<span id="L317" class="LineNr">317 </span><span class="Comment"># entering g</span> -<span id="L318" class="LineNr">318 </span><span class="traceContains">+mem: new alloc: 1007</span> -<span id="L319" class="LineNr">319 </span><span class="Comment"># return control to main</span> -<span id="L320" class="LineNr">320 </span><span class="traceContains">+run: return-continuation-until-mark</span> -<span id="L321" class="LineNr">321 </span><span class="Comment"># no allocs abandoned yet</span> -<span id="L322" class="LineNr">322 </span><span class="Comment"># finish running main</span> -<span id="L323" class="LineNr">323 </span><span class="traceContains">+run: call {k: "continuation"}</span> -<span id="L324" class="LineNr">324 </span><span class="traceContains">+run: add {1: "literal"}, {1: "literal"}</span> -<span id="L325" class="LineNr">325 </span><span class="traceContains">+run: return {34: "literal"}</span> -<span id="L326" class="LineNr">326 </span><span class="Comment"># now k is reclaimed</span> -<span id="L327" class="LineNr">327 </span><span class="traceContains">+mem: trying to reclaim local k:continuation</span> -<span id="L328" class="LineNr">328 </span><span class="Comment"># at this point all allocs in the continuation are abandoned</span> -<span id="L329" class="LineNr">329 </span><span class="traceContains">+mem: automatically abandoning 1007</span> -<span id="L330" class="LineNr">330 </span><span class="traceContains">+mem: automatically abandoning 1004</span> -<span id="L331" class="LineNr">331 </span><span class="Comment"># finally the alloc for main is abandoned</span> -<span id="L332" class="LineNr">332 </span><span class="traceContains">+mem: automatically abandoning 1000</span> -<span id="L333" class="LineNr">333 </span> -<span id="L334" class="LineNr">334 </span><span class="Delimiter">:(before "End Increment Refcounts(canonized_x)")</span> -<span id="L335" class="LineNr">335 </span><span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_continuation<span class="Delimiter">(</span>canonized_x<span class="Delimiter">))</span> <span class="Delimiter">{</span> -<span id="L336" class="LineNr">336 </span> <span class="Normal">int</span> continuation_id = data<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span> -<span id="L337" class="LineNr">337 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>continuation_id == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span> -<span id="L338" class="LineNr">338 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> continuation_id<span class="Delimiter">))</span> <span class="Delimiter">{</span> -<span id="L339" class="LineNr">339 </span> <span class="Conceal">¦</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">"missing delimited continuation: "</span> << canonized_x<span class="Delimiter">.</span>name << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span> -<span id="L340" class="LineNr">340 </span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span> -<span id="L341" class="LineNr">341 </span> <span class="Delimiter">}</span> -<span id="L342" class="LineNr">342 </span> delimited_continuation& curr = get<span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> continuation_id<span class="Delimiter">);</span> -<span id="L343" class="LineNr">343 </span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"incrementing refcount of continuation "</span> << continuation_id << <span class="Constant">": "</span> << curr<span class="Delimiter">.</span>nrefs << <span class="Constant">" -> "</span> << <span class="Constant">1</span>+curr<span class="Delimiter">.</span>nrefs << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> -<span id="L344" class="LineNr">344 </span> ++curr<span class="Delimiter">.</span>nrefs<span class="Delimiter">;</span> -<span id="L345" class="LineNr">345 </span> <span class="Identifier">return</span><span class="Delimiter">;</span> -<span id="L346" class="LineNr">346 </span><span class="Delimiter">}</span> -<span id="L347" class="LineNr">347 </span> -<span id="L348" class="LineNr">348 </span><span class="Delimiter">:(before "End Decrement Refcounts(canonized_x)")</span> -<span id="L349" class="LineNr">349 </span><span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_continuation<span class="Delimiter">(</span>canonized_x<span class="Delimiter">))</span> <span class="Delimiter">{</span> -<span id="L350" class="LineNr">350 </span> <span class="Normal">int</span> continuation_id = <a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> canonized_x<span class="Delimiter">.</span>value<span class="Delimiter">);</span> -<span id="L351" class="LineNr">351 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>continuation_id == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span> -<span id="L352" class="LineNr">352 </span> delimited_continuation& curr = get<span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> continuation_id<span class="Delimiter">);</span> -<span id="L353" class="LineNr">353 </span> assert<span class="Delimiter">(</span>curr<span class="Delimiter">.</span>nrefs > <span class="Constant">0</span><span class="Delimiter">);</span> -<span id="L354" class="LineNr">354 </span> --curr<span class="Delimiter">.</span>nrefs<span class="Delimiter">;</span> -<span id="L355" class="LineNr">355 </span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"decrementing refcount of continuation "</span> << continuation_id << <span class="Constant">": "</span> << <span class="Constant">1</span>+curr<span class="Delimiter">.</span>nrefs << <span class="Constant">" -> "</span> << curr<span class="Delimiter">.</span>nrefs << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> -<span id="L356" class="LineNr">356 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>nrefs > <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span> -<span id="L357" class="LineNr">357 </span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"reclaiming continuation "</span> << continuation_id << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> -<span id="L358" class="LineNr">358 </span> <span class="Comment">// temporarily push the stack frames for the continuation to the call stack before reclaiming their spaces</span> -<span id="L359" class="LineNr">359 </span> <span class="Comment">// (because reclaim_default_space() relies on the default-space being reclaimed being at the top of the stack)</span> -<span id="L360" class="LineNr">360 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>call_stack::const_iterator p = curr<span class="Delimiter">.</span>frames<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != curr<span class="Delimiter">.</span>frames<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span> -<span id="L361" class="LineNr">361 </span> <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>*p<span class="Delimiter">);</span> -<span id="L362" class="LineNr">362 </span> <span class="Conceal">¦</span> <a href='043space.cc.html#L244'>reclaim_default_space</a><span class="Delimiter">();</span> -<span id="L363" class="LineNr">363 </span> <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>pop_front<span class="Delimiter">();</span> -<span id="L364" class="LineNr">364 </span> <span class="Delimiter">}</span> -<span id="L365" class="LineNr">365 </span> Delimited_continuation<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>continuation_id<span class="Delimiter">);</span> -<span id="L366" class="LineNr">366 </span> <span class="Identifier">return</span><span class="Delimiter">;</span> -<span id="L367" class="LineNr">367 </span><span class="Delimiter">}</span> -<span id="L368" class="LineNr">368 </span> -<span id="L369" class="LineNr">369 </span><span class="Delimiter">:(scenario continuations_can_be_copied)</span> -<span id="L370" class="LineNr">370 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [ -<span id="L371" class="LineNr">371 </span> local-scope -<span id="L372" class="LineNr">372 </span> <span class="Normal">k</span>:continuation<span class="Special"> <- </span>call-with-continuation-mark f -<span id="L373" class="LineNr">373 </span> <span class="Normal">k2</span>:continuation<span class="Special"> <- </span>copy k -<span id="L374" class="LineNr">374 </span> <span class="Comment"># reclaiming k and k2 shouldn't delete f's local scope twice</span> -<span id="L375" class="LineNr">375 </span>] -<span id="L376" class="LineNr">376 </span><span class="muRecipe">def</span> f [ -<span id="L377" class="LineNr">377 </span> local-scope -<span id="L378" class="LineNr">378 </span> load-ingredients -<span id="L379" class="LineNr">379 </span> <span class="Identifier">return</span>-continuation-until-mark -<span id="L380" class="LineNr">380 </span> <span class="Identifier">return</span> <span class="Constant">0</span> -<span id="L381" class="LineNr">381 </span>] -<span id="L382" class="LineNr">382 </span>$error: <span class="Constant">0</span> -<span id="L383" class="LineNr">383 </span> -<span id="L384" class="LineNr">384 </span><span class="Delimiter">:(code)</span> -<span id="L385" class="LineNr">385 </span><span class="Normal">bool</span> is_mu_continuation<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="L386" class="LineNr">386 </span> canonize_type<span class="Delimiter">(</span>x<span class="Delimiter">);</span> -<span id="L387" class="LineNr">387 </span> <span class="Identifier">return</span> x<span class="Delimiter">.</span>type && x<span class="Delimiter">.</span>type<span class="Delimiter">-></span>atom && x<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">"continuation"</span><span class="Delimiter">);</span> -<span id="L388" class="LineNr">388 </span><span class="Delimiter">}</span> -<span id="L389" class="LineNr">389 </span> -<span id="L390" class="LineNr">390 </span><span class="Comment">// helper for debugging</span> -<span id="L391" class="LineNr">391 </span><span class="Normal">void</span> <a href='003trace.cc.html#L120'>dump</a><span class="Delimiter">(</span><span class="Normal">const</span> <span class="Normal">int</span> continuation_id<span class="Delimiter">)</span> <span class="Delimiter">{</span> -<span id="L392" class="LineNr">392 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> continuation_id<span class="Delimiter">))</span> <span class="Delimiter">{</span> -<span id="L393" class="LineNr">393 </span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L174'>raise</a> << <span class="Constant">"missing delimited continuation: "</span> << continuation_id << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> -<span id="L394" class="LineNr">394 </span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span> -<span id="L395" class="LineNr">395 </span> <span class="Delimiter">}</span> -<span id="L396" class="LineNr">396 </span> delimited_continuation& curr = get<span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> continuation_id<span class="Delimiter">);</span> -<span id="L397" class="LineNr">397 </span> <a href='003trace.cc.html#L120'>dump</a><span class="Delimiter">(</span>curr<span class="Delimiter">.</span>frames<span class="Delimiter">);</span> -<span id="L398" class="LineNr">398 </span><span class="Delimiter">}</span> +<span id="L133" class="LineNr">133 </span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>is_base_of_continuation = <a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>value<span class="Delimiter">;</span> +<span id="L134" class="LineNr">134 </span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>call<span class="Delimiter">(</span>Recipe_ordinal[current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name]<span class="Delimiter">));</span> +<span id="L135" class="LineNr">135 </span> ingredients<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">());</span> <span class="Comment">// drop the mark</span> +<span id="L136" class="LineNr">136 </span> ingredients<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">());</span> <span class="Comment">// drop the callee</span> +<span id="L137" class="LineNr">137 </span> finish_call_housekeeping<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">,</span> ingredients<span class="Delimiter">);</span> +<span id="L138" class="LineNr">138 </span> <span class="Identifier">continue</span><span class="Delimiter">;</span> +<span id="L139" class="LineNr">139 </span><span class="Delimiter">}</span> +<span id="L140" class="LineNr">140 </span> +<span id="L141" class="LineNr">141 </span><span class="Comment">//: save the slice of current call stack until the 'call-with-continuation-mark'</span> +<span id="L142" class="LineNr">142 </span><span class="Comment">//: call, and return it as the result.</span> +<span id="L143" class="LineNr">143 </span><span class="Comment">//: todo: implement delimited continuations in Mu's memory</span> +<span id="L144" class="LineNr">144 </span><span class="Delimiter">:(before "End Types")</span> +<span id="L145" class="LineNr">145 </span><span class="Normal">struct</span> delimited_continuation <span class="Delimiter">{</span> +<span id="L146" class="LineNr">146 </span> call_stack frames<span class="Delimiter">;</span> +<span id="L147" class="LineNr">147 </span> <span class="Normal">int</span> nrefs<span class="Delimiter">;</span> +<span id="L148" class="LineNr">148 </span> delimited_continuation<span class="Delimiter">(</span>call_stack::iterator begin<span class="Delimiter">,</span> call_stack::iterator <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">)</span> :frames<span class="Delimiter">(</span>call_stack<span class="Delimiter">(</span>begin<span class="Delimiter">,</span> <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">)),</span> nrefs<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{}</span> +<span id="L149" class="LineNr">149 </span><span class="Delimiter">};</span> +<span id="L150" class="LineNr">150 </span><span class="Delimiter">:(before "End Globals")</span> +<span id="L151" class="LineNr">151 </span>map<<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span><span class="Delimiter">,</span> delimited_continuation> Delimited_continuation<span class="Delimiter">;</span> +<span id="L152" class="LineNr">152 </span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> Next_delimited_continuation_id = <span class="Constant">1</span><span class="Delimiter">;</span> <span class="Comment">// 0 is null just like an address</span> +<span id="L153" class="LineNr">153 </span><span class="Delimiter">:(before "End Reset")</span> +<span id="L154" class="LineNr">154 </span>Delimited_continuation<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span> +<span id="L155" class="LineNr">155 </span>Next_delimited_continuation_id = <span class="Constant">1</span><span class="Delimiter">;</span> +<span id="L156" class="LineNr">156 </span> +<span id="L157" class="LineNr">157 </span><span class="Delimiter">:(before "End Primitive Recipe Declarations")</span> +<span id="L158" class="LineNr">158 </span>RETURN_CONTINUATION_UNTIL_MARK<span class="Delimiter">,</span> +<span id="L159" class="LineNr">159 </span><span class="Delimiter">:(before "End Primitive Recipe Numbers")</span> +<span id="L160" class="LineNr">160 </span>Recipe_ordinal[<span class="Constant">"return-continuation-until-mark"</span>] = RETURN_CONTINUATION_UNTIL_MARK<span class="Delimiter">;</span> +<span id="L161" class="LineNr">161 </span><span class="Delimiter">:(before "End Primitive Recipe Checks")</span> +<span id="L162" class="LineNr">162 </span><span class="Normal">case</span> RETURN_CONTINUATION_UNTIL_MARK: <span class="Delimiter">{</span> +<span id="L163" class="LineNr">163 </span> <span class="Identifier">break</span><span class="Delimiter">;</span> +<span id="L164" class="LineNr">164 </span><span class="Delimiter">}</span> +<span id="L165" class="LineNr">165 </span><span class="Delimiter">:(before "End Primitive Recipe Implementations")</span> +<span id="L166" class="LineNr">166 </span><span class="Normal">case</span> RETURN_CONTINUATION_UNTIL_MARK: <span class="Delimiter">{</span> +<span id="L167" class="LineNr">167 </span> <span class="Comment">// I don't know how to think about next-ingredient in combination with</span> +<span id="L168" class="LineNr">168 </span> <span class="Comment">// continuations, so seems cleaner to just kill it. Functions have to read</span> +<span id="L169" class="LineNr">169 </span> <span class="Comment">// their inputs before ever returning a continuation.</span> +<span id="L170" class="LineNr">170 </span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span> +<span id="L171" class="LineNr">171 </span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>next_ingredient_to_process = <span class="Constant">0</span><span class="Delimiter">;</span> +<span id="L172" class="LineNr">172 </span> <span class="Comment">// copy the current call stack until the most recent marked call</span> +<span id="L173" class="LineNr">173 </span> call_stack::iterator find_base_of_continuation<span class="Delimiter">(</span>call_stack&<span class="Delimiter">,</span> <span class="Normal">int</span><span class="Delimiter">);</span> <span class="Comment">// manual prototype containing '::'</span> +<span id="L174" class="LineNr">174 </span> call_stack::iterator base = find_base_of_continuation<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">mark identifier</span><span class="Comment">*/</span><a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>value<span class="Delimiter">);</span> +<span id="L175" class="LineNr">175 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>base == Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span> +<span id="L176" class="LineNr">176 </span> <span class="Conceal">¦</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">"couldn't find a 'call-with-continuation-mark' to return to</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span> +<span id="L177" class="LineNr">177 </span> <span class="Conceal">¦</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">"call stack:</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> +<span id="L178" class="LineNr">178 </span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>call_stack::iterator p = Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> +<span id="L179" class="LineNr">179 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</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">" "</span> << get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> p<span class="Delimiter">-></span>running_recipe<span class="Delimiter">).</span>name << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> +<span id="L180" class="LineNr">180 </span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span> +<span id="L181" class="LineNr">181 </span> <span class="Delimiter">}</span> +<span id="L182" class="LineNr">182 </span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"creating continuation "</span> << Next_delimited_continuation_id << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> +<span id="L183" class="LineNr">183 </span> <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> Next_delimited_continuation_id<span class="Delimiter">,</span> delimited_continuation<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> base<span class="Delimiter">));</span> +<span id="L184" class="LineNr">184 </span> <span class="Normal">while</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>begin<span class="Delimiter">()</span> != base<span class="Delimiter">)</span> <span class="Delimiter">{</span> +<span id="L185" class="LineNr">185 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span> +<span id="L186" class="LineNr">186 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> --Trace_stream<span class="Delimiter">-></span>callstack_depth<span class="Delimiter">;</span> +<span id="L187" class="LineNr">187 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-></span>callstack_depth >= <span class="Constant">0</span><span class="Delimiter">);</span> +<span id="L188" class="LineNr">188 </span> <span class="Conceal">¦</span> <span class="Delimiter">}</span> +<span id="L189" class="LineNr">189 </span> <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>pop_front<span class="Delimiter">();</span> +<span id="L190" class="LineNr">190 </span> <span class="Delimiter">}</span> +<span id="L191" class="LineNr">191 </span> <span class="Comment">// return it as the result of the marked call</span> +<span id="L192" class="LineNr">192 </span> products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span> +<span id="L193" class="LineNr">193 </span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>Next_delimited_continuation_id<span class="Delimiter">);</span> +<span id="L194" class="LineNr">194 </span> <span class="Comment">// return any other ingredients passed in</span> +<span id="L195" class="LineNr">195 </span> copy<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">skip mark identifier</span><span class="Comment">*/</span>++ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> ingredients<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">(),</span> inserter<span class="Delimiter">(</span>products<span class="Delimiter">,</span> products<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">()));</span> +<span id="L196" class="LineNr">196 </span> ++Next_delimited_continuation_id<span class="Delimiter">;</span> +<span id="L197" class="LineNr">197 </span> <span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// continue to process rest of marked call</span> +<span id="L198" class="LineNr">198 </span><span class="Delimiter">}</span> +<span id="L199" class="LineNr">199 </span> +<span id="L200" class="LineNr">200 </span><span class="Delimiter">:(code)</span> +<span id="L201" class="LineNr">201 </span>call_stack::iterator find_base_of_continuation<span class="Delimiter">(</span>call_stack& c<span class="Delimiter">,</span> <span class="Normal">int</span> mark<span class="Delimiter">)</span> <span class="Delimiter">{</span> +<span id="L202" class="LineNr">202 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>call_stack::iterator p = c<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != c<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> +<span id="L203" class="LineNr">203 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-></span>is_base_of_continuation == mark<span class="Delimiter">)</span> <span class="Identifier">return</span> p<span class="Delimiter">;</span> +<span id="L204" class="LineNr">204 </span> <span class="Identifier">return</span> c<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> +<span id="L205" class="LineNr">205 </span><span class="Delimiter">}</span> +<span id="L206" class="LineNr">206 </span> +<span id="L207" class="LineNr">207 </span><span class="Comment">//: overload 'call' for continuations</span> +<span id="L208" class="LineNr">208 </span><span class="Delimiter">:(after "Begin Call")</span> +<span id="L209" class="LineNr">209 </span><span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_continuation<span class="Delimiter">(</span><a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span> +<span id="L210" class="LineNr">210 </span> <span class="Comment">// copy multiple calls on to current call stack</span> +<span id="L211" class="LineNr">211 </span> assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span> +<span id="L212" class="LineNr">212 </span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"calling continuation "</span> << ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> +<span id="L213" class="LineNr">213 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> +<span id="L214" class="LineNr">214 </span> <span class="Conceal">¦</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">"no such delimited continuation "</span> << <a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> +<span id="L215" class="LineNr">215 </span> <span class="Normal">const</span> call_stack& new_frames = get<span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)).</span>frames<span class="Delimiter">;</span> +<span id="L216" class="LineNr">216 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>call_stack::const_reverse_iterator p = new_frames<span class="Delimiter">.</span>rbegin<span class="Delimiter">();</span> p != new_frames<span class="Delimiter">.</span>rend<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span> +<span id="L217" class="LineNr">217 </span> <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>*p<span class="Delimiter">);</span> +<span id="L218" class="LineNr">218 </span> <span class="Conceal">¦</span> <span class="Comment">// ensure that the presence of a continuation keeps its stack frames from being reclaimed</span> +<span id="L219" class="LineNr">219 </span> <span class="Conceal">¦</span> <a href='036refcount.cc.html#L50'>increment_refcount</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>default_space<span class="Delimiter">);</span> +<span id="L220" class="LineNr">220 </span> <span class="Delimiter">}</span> +<span id="L221" class="LineNr">221 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span> +<span id="L222" class="LineNr">222 </span> <span class="Conceal">¦</span> Trace_stream<span class="Delimiter">-></span>callstack_depth += <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>new_frames<span class="Delimiter">);</span> +<span id="L223" class="LineNr">223 </span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"trace"</span><span class="Delimiter">)</span> << <span class="Constant">"calling delimited continuation; growing callstack depth to "</span> << Trace_stream<span class="Delimiter">-></span>callstack_depth << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> +<span id="L224" class="LineNr">224 </span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-></span>callstack_depth < <span class="Constant">9000</span><span class="Delimiter">);</span> <span class="Comment">// 9998-101 plus cushion</span> +<span id="L225" class="LineNr">225 </span> <span class="Delimiter">}</span> +<span id="L226" class="LineNr">226 </span> <span class="Comment">// no call housekeeping; continuations don't support next-ingredient</span> +<span id="L227" class="LineNr">227 </span> copy<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">drop continuation</span><span class="Comment">*/</span>++ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> ingredients<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><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 id="L228" class="LineNr">228 </span> <span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// record results of resuming 'return-continuation-until-mark' instruction</span> +<span id="L229" class="LineNr">229 </span><span class="Delimiter">}</span> +<span id="L230" class="LineNr">230 </span> +<span id="L231" class="LineNr">231 </span><span class="Delimiter">:(scenario continuations_can_return_values)</span> +<span id="L232" class="LineNr">232 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [ +<span id="L233" class="LineNr">233 </span> local-scope +<span id="L234" class="LineNr">234 </span> <span class="Normal">k</span>:continuation<span class="Delimiter">,</span> <span class="Constant">1</span>:num/<span class="Special">raw <- </span>call-with-continuation-mark <span class="Constant">233</span>/mark<span class="Delimiter">,</span> f +<span id="L235" class="LineNr">235 </span>] +<span id="L236" class="LineNr">236 </span><span class="muRecipe">def</span> f [ +<span id="L237" class="LineNr">237 </span> local-scope +<span id="L238" class="LineNr">238 </span> g +<span id="L239" class="LineNr">239 </span>] +<span id="L240" class="LineNr">240 </span><span class="muRecipe">def</span> g [ +<span id="L241" class="LineNr">241 </span> local-scope +<span id="L242" class="LineNr">242 </span> <span class="Identifier">return</span>-continuation-until-mark <span class="Constant">233</span>/mark<span class="Delimiter">,</span> <span class="Constant">34</span> +<span id="L243" class="LineNr">243 </span> stash [continuation called] +<span id="L244" class="LineNr">244 </span>] +<span id="L245" class="LineNr">245 </span><span class="Comment"># entering main</span> +<span id="L246" class="LineNr">246 </span><span class="traceContains">+mem: new alloc: 1000</span> +<span id="L247" class="LineNr">247 </span><span class="traceContains">+run: {k: "continuation"}, {1: "number", "raw": ()} <- call-with-continuation-mark {233: "literal", "mark": ()}, {f: "recipe-literal"}</span> +<span id="L248" class="LineNr">248 </span><span class="Comment"># entering f</span> +<span id="L249" class="LineNr">249 </span><span class="traceContains">+mem: new alloc: 1004</span> +<span id="L250" class="LineNr">250 </span><span class="Comment"># entering g</span> +<span id="L251" class="LineNr">251 </span><span class="traceContains">+mem: new alloc: 1007</span> +<span id="L252" class="LineNr">252 </span><span class="Comment"># return control to main</span> +<span id="L253" class="LineNr">253 </span><span class="traceContains">+run: return-continuation-until-mark {233: "literal", "mark": ()}, {34: "literal"}</span> +<span id="L254" class="LineNr">254 </span><span class="Comment"># no allocs abandoned yet</span> +<span id="L255" class="LineNr">255 </span><span class="traceContains">+mem: storing 34 in location 1</span> +<span id="L256" class="LineNr">256 </span><span class="Comment"># end of main</span> +<span id="L257" class="LineNr">257 </span><span class="Comment"># make sure no memory leaks..</span> +<span id="L258" class="LineNr">258 </span><span class="traceContains">+mem: trying to reclaim local k:continuation</span> +<span id="L259" class="LineNr">259 </span><span class="traceContains">+mem: automatically abandoning 1007</span> +<span id="L260" class="LineNr">260 </span><span class="traceContains">+mem: automatically abandoning 1004</span> +<span id="L261" class="LineNr">261 </span><span class="traceContains">+mem: automatically abandoning 1000</span> +<span id="L262" class="LineNr">262 </span><span class="Comment"># ..even though we never called the continuation</span> +<span id="L263" class="LineNr">263 </span><span class="traceAbsent">-app: continuation called</span> +<span id="L264" class="LineNr">264 </span> +<span id="L265" class="LineNr">265 </span><span class="Delimiter">:(scenario continuations_continue_to_matching_mark)</span> +<span id="L266" class="LineNr">266 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [ +<span id="L267" class="LineNr">267 </span> local-scope +<span id="L268" class="LineNr">268 </span> <span class="Normal">k</span>:continuation<span class="Delimiter">,</span> <span class="Constant">1</span>:num/<span class="Special">raw <- </span>call-with-continuation-mark <span class="Constant">233</span>/mark<span class="Delimiter">,</span> f +<span id="L269" class="LineNr">269 </span> add <span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">1</span> +<span id="L270" class="LineNr">270 </span>] +<span id="L271" class="LineNr">271 </span><span class="muRecipe">def</span> f [ +<span id="L272" class="LineNr">272 </span> local-scope +<span id="L273" class="LineNr">273 </span> <span class="Normal">k2</span>:continuation<span class="Special"> <- </span>call-with-continuation-mark <span class="Constant">234</span>/mark<span class="Delimiter">,</span> g +<span id="L274" class="LineNr">274 </span> add <span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">2</span> +<span id="L275" class="LineNr">275 </span>] +<span id="L276" class="LineNr">276 </span><span class="muRecipe">def</span> g [ +<span id="L277" class="LineNr">277 </span> local-scope +<span id="L278" class="LineNr">278 </span> <span class="Identifier">return</span>-continuation-until-mark <span class="Constant">233</span>/mark<span class="Delimiter">,</span> <span class="Constant">34</span> +<span id="L279" class="LineNr">279 </span> stash [continuation called] +<span id="L280" class="LineNr">280 </span>] +<span id="L281" class="LineNr">281 </span><span class="traceContains">+run: add {1: "literal"}, {1: "literal"}</span> +<span id="L282" class="LineNr">282 </span><span class="traceAbsent">-run: add {2: "literal"}, {2: "literal"}</span> +<span id="L283" class="LineNr">283 </span> +<span id="L284" class="LineNr">284 </span><span class="Comment">//: Allow shape-shifting recipes to return continuations.</span> +<span id="L285" class="LineNr">285 </span> +<span id="L286" class="LineNr">286 </span><span class="Delimiter">:(scenario call_shape_shifting_recipe_with_continuation_mark)</span> +<span id="L287" class="LineNr">287 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [ +<span id="L288" class="LineNr">288 </span> <span class="Constant">1</span>:num<span class="Special"> <- </span>call-with-continuation-mark <span class="Constant">233</span>/mark<span class="Delimiter">,</span> f<span class="Delimiter">,</span> <span class="Constant">34</span> +<span id="L289" class="LineNr">289 </span>] +<span id="L290" class="LineNr">290 </span><span class="muRecipe">def</span> f x:_elem<span class="muRecipe"> -> </span>y:_elem [ +<span id="L291" class="LineNr">291 </span> local-scope +<span id="L292" class="LineNr">292 </span> load-ingredients +<span id="L293" class="LineNr">293 </span> y<span class="Special"> <- </span>copy x +<span id="L294" class="LineNr">294 </span>] +<span id="L295" class="LineNr">295 </span><span class="traceContains">+mem: storing 34 in location 1</span> +<span id="L296" class="LineNr">296 </span> +<span id="L297" class="LineNr">297 </span><span class="Delimiter">:(before "End resolve_ambiguous_call(r, index, inst, caller_recipe) Special-cases")</span> +<span id="L298" class="LineNr">298 </span><span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">"call-with-continuation-mark"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span> +<span id="L299" class="LineNr">299 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> > <span class="Constant">1</span> && <a href='072recipe.cc.html#L213'>is_recipe_literal</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">skip mark</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span> +<span id="L300" class="LineNr">300 </span> resolve_indirect_continuation_call<span class="Delimiter">(</span>r<span class="Delimiter">,</span> index<span class="Delimiter">,</span> inst<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">);</span> +<span id="L301" class="LineNr">301 </span> <span class="Identifier">return</span><span class="Delimiter">;</span> +<span id="L302" class="LineNr">302 </span> <span class="Delimiter">}</span> +<span id="L303" class="LineNr">303 </span><span class="Delimiter">}</span> +<span id="L304" class="LineNr">304 </span><span class="Delimiter">:(code)</span> +<span id="L305" class="LineNr">305 </span><span class="Normal">void</span> resolve_indirect_continuation_call<span class="Delimiter">(</span><span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">,</span> <span class="Normal">int</span> index<span class="Delimiter">,</span> instruction& inst<span class="Delimiter">,</span> <span class="Normal">const</span> recipe& caller_recipe<span class="Delimiter">)</span> <span class="Delimiter">{</span> +<span id="L306" class="LineNr">306 </span> <a href='010vm.cc.html#L32'>instruction</a> inst2<span class="Delimiter">;</span> +<span id="L307" class="LineNr">307 </span> inst2<span class="Delimiter">.</span>name = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">skip mark</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">).</span>name<span class="Delimiter">;</span> +<span id="L308" class="LineNr">308 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/*</span><span class="Comment">skip mark and <a href='010vm.cc.html#L19'>recipe</a></span><span class="Comment">*/</span><span class="Constant">2</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 id="L309" class="LineNr">309 </span> <span class="Conceal">¦</span> inst2<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<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="L310" class="LineNr">310 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/*</span><span class="Comment">skip continuation</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> +<span id="L311" class="LineNr">311 </span> <span class="Conceal">¦</span> inst2<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span> +<span id="L312" class="LineNr">312 </span> <a href='054static_dispatch.cc.html#L173'>resolve_ambiguous_call</a><span class="Delimiter">(</span>r<span class="Delimiter">,</span> index<span class="Delimiter">,</span> inst2<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">);</span> +<span id="L313" class="LineNr">313 </span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">skip mark</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">).</span>name = inst2<span class="Delimiter">.</span>name<span class="Delimiter">;</span> +<span id="L314" class="LineNr">314 </span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">skip mark</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">).</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> inst2<span class="Delimiter">.</span>name<span class="Delimiter">));</span> +<span id="L315" class="LineNr">315 </span><span class="Delimiter">}</span> +<span id="L316" class="LineNr">316 </span> +<span id="L317" class="LineNr">317 </span><span class="Delimiter">:(scenario call_shape_shifting_recipe_with_continuation_mark_and_no_outputs)</span> +<span id="L318" class="LineNr">318 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [ +<span id="L319" class="LineNr">319 </span> <span class="Constant">1</span>:continuation<span class="Special"> <- </span>call-with-continuation-mark <span class="Constant">233</span>/mark<span class="Delimiter">,</span> f<span class="Delimiter">,</span> <span class="Constant">34</span> +<span id="L320" class="LineNr">320 </span>] +<span id="L321" class="LineNr">321 </span><span class="muRecipe">def</span> f x:_elem [ +<span id="L322" class="LineNr">322 </span> local-scope +<span id="L323" class="LineNr">323 </span> load-ingredients +<span id="L324" class="LineNr">324 </span> <span class="Identifier">return</span>-continuation-until-mark <span class="Constant">233</span>/mark +<span id="L325" class="LineNr">325 </span>] +<span id="L326" class="LineNr">326 </span>$error: <span class="Constant">0</span> +<span id="L327" class="LineNr">327 </span> +<span id="L328" class="LineNr">328 </span><span class="Delimiter">:(scenario continuation1)</span> +<span id="L329" class="LineNr">329 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [ +<span id="L330" class="LineNr">330 </span> local-scope +<span id="L331" class="LineNr">331 </span> <span class="Normal">k</span>:continuation<span class="Special"> <- </span>call-with-continuation-mark <span class="Constant">233</span>/mark<span class="Delimiter">,</span> create-yielder +<span id="L332" class="LineNr">332 </span> <span class="Constant">10</span>:num/<span class="Special">raw <- </span>call k +<span id="L333" class="LineNr">333 </span>] +<span id="L334" class="LineNr">334 </span><span class="muRecipe">def</span> create-yielder<span class="muRecipe"> -> </span>n:num [ +<span id="L335" class="LineNr">335 </span> local-scope +<span id="L336" class="LineNr">336 </span> load-inputs +<span id="L337" class="LineNr">337 </span> <span class="Identifier">return</span>-continuation-until-mark <span class="Constant">233</span>/mark +<span id="L338" class="LineNr">338 </span> <span class="Identifier">return</span> <span class="Constant">1</span> +<span id="L339" class="LineNr">339 </span>] +<span id="L340" class="LineNr">340 </span><span class="traceContains">+mem: storing 1 in location 10</span> +<span id="L341" class="LineNr">341 </span>$error: <span class="Constant">0</span> +<span id="L342" class="LineNr">342 </span> +<span id="L343" class="LineNr">343 </span><span class="Comment">//: Ensure that the presence of a continuation keeps its stack frames from being reclaimed.</span> +<span id="L344" class="LineNr">344 </span> +<span id="L345" class="LineNr">345 </span><span class="Delimiter">:(scenario continuations_preserve_local_scopes)</span> +<span id="L346" class="LineNr">346 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [ +<span id="L347" class="LineNr">347 </span> local-scope +<span id="L348" class="LineNr">348 </span> <span class="Normal">k</span>:continuation<span class="Special"> <- </span>call-with-continuation-mark <span class="Constant">233</span>/mark<span class="Delimiter">,</span> f +<span id="L349" class="LineNr">349 </span> call k +<span id="L350" class="LineNr">350 </span> <span class="Identifier">return</span> <span class="Constant">34</span> +<span id="L351" class="LineNr">351 </span>] +<span id="L352" class="LineNr">352 </span><span class="muRecipe">def</span> f [ +<span id="L353" class="LineNr">353 </span> local-scope +<span id="L354" class="LineNr">354 </span> g +<span id="L355" class="LineNr">355 </span>] +<span id="L356" class="LineNr">356 </span><span class="muRecipe">def</span> g [ +<span id="L357" class="LineNr">357 </span> local-scope +<span id="L358" class="LineNr">358 </span> <span class="Identifier">return</span>-continuation-until-mark <span class="Constant">233</span>/mark +<span id="L359" class="LineNr">359 </span> add <span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">1</span> +<span id="L360" class="LineNr">360 </span>] +<span id="L361" class="LineNr">361 </span><span class="Comment"># entering main</span> +<span id="L362" class="LineNr">362 </span><span class="traceContains">+mem: new alloc: 1000</span> +<span id="L363" class="LineNr">363 </span><span class="traceContains">+run: {k: "continuation"} <- call-with-continuation-mark {233: "literal", "mark": ()}, {f: "recipe-literal"}</span> +<span id="L364" class="LineNr">364 </span><span class="Comment"># entering f</span> +<span id="L365" class="LineNr">365 </span><span class="traceContains">+mem: new alloc: 1004</span> +<span id="L366" class="LineNr">366 </span><span class="Comment"># entering g</span> +<span id="L367" class="LineNr">367 </span><span class="traceContains">+mem: new alloc: 1007</span> +<span id="L368" class="LineNr">368 </span><span class="Comment"># return control to main</span> +<span id="L369" class="LineNr">369 </span><span class="traceContains">+run: return-continuation-until-mark {233: "literal", "mark": ()}</span> +<span id="L370" class="LineNr">370 </span><span class="Comment"># no allocs abandoned yet</span> +<span id="L371" class="LineNr">371 </span><span class="Comment"># finish running main</span> +<span id="L372" class="LineNr">372 </span><span class="traceContains">+run: call {k: "continuation"}</span> +<span id="L373" class="LineNr">373 </span><span class="traceContains">+run: add {1: "literal"}, {1: "literal"}</span> +<span id="L374" class="LineNr">374 </span><span class="traceContains">+run: return {34: "literal"}</span> +<span id="L375" class="LineNr">375 </span><span class="Comment"># now k is reclaimed</span> +<span id="L376" class="LineNr">376 </span><span class="traceContains">+mem: trying to reclaim local k:continuation</span> +<span id="L377" class="LineNr">377 </span><span class="Comment"># at this point all allocs in the continuation are abandoned</span> +<span id="L378" class="LineNr">378 </span><span class="traceContains">+mem: automatically abandoning 1007</span> +<span id="L379" class="LineNr">379 </span><span class="traceContains">+mem: automatically abandoning 1004</span> +<span id="L380" class="LineNr">380 </span><span class="Comment"># finally the alloc for main is abandoned</span> +<span id="L381" class="LineNr">381 </span><span class="traceContains">+mem: automatically abandoning 1000</span> +<span id="L382" class="LineNr">382 </span> +<span id="L383" class="LineNr">383 </span><span class="Delimiter">:(before "End Increment Refcounts(canonized_x)")</span> +<span id="L384" class="LineNr">384 </span><span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_continuation<span class="Delimiter">(</span>canonized_x<span class="Delimiter">))</span> <span class="Delimiter">{</span> +<span id="L385" class="LineNr">385 </span> <span class="Normal">int</span> continuation_id = data<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span> +<span id="L386" class="LineNr">386 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>continuation_id == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span> +<span id="L387" class="LineNr">387 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> continuation_id<span class="Delimiter">))</span> <span class="Delimiter">{</span> +<span id="L388" class="LineNr">388 </span> <span class="Conceal">¦</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">"missing delimited continuation: "</span> << canonized_x<span class="Delimiter">.</span>name << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span> +<span id="L389" class="LineNr">389 </span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span> +<span id="L390" class="LineNr">390 </span> <span class="Delimiter">}</span> +<span id="L391" class="LineNr">391 </span> delimited_continuation& curr = get<span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> continuation_id<span class="Delimiter">);</span> +<span id="L392" class="LineNr">392 </span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"incrementing refcount of continuation "</span> << continuation_id << <span class="Constant">": "</span> << curr<span class="Delimiter">.</span>nrefs << <span class="Constant">" -> "</span> << <span class="Constant">1</span>+curr<span class="Delimiter">.</span>nrefs << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> +<span id="L393" class="LineNr">393 </span> ++curr<span class="Delimiter">.</span>nrefs<span class="Delimiter">;</span> +<span id="L394" class="LineNr">394 </span> <span class="Identifier">return</span><span class="Delimiter">;</span> +<span id="L395" class="LineNr">395 </span><span class="Delimiter">}</span> +<span id="L396" class="LineNr">396 </span> +<span id="L397" class="LineNr">397 </span><span class="Delimiter">:(before "End Decrement Refcounts(canonized_x)")</span> +<span id="L398" class="LineNr">398 </span><span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_continuation<span class="Delimiter">(</span>canonized_x<span class="Delimiter">))</span> <span class="Delimiter">{</span> +<span id="L399" class="LineNr">399 </span> <span class="Normal">int</span> continuation_id = <a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> canonized_x<span class="Delimiter">.</span>value<span class="Delimiter">);</span> +<span id="L400" class="LineNr">400 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>continuation_id == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span> +<span id="L401" class="LineNr">401 </span> delimited_continuation& curr = get<span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> continuation_id<span class="Delimiter">);</span> +<span id="L402" class="LineNr">402 </span> assert<span class="Delimiter">(</span>curr<span class="Delimiter">.</span>nrefs > <span class="Constant">0</span><span class="Delimiter">);</span> +<span id="L403" class="LineNr">403 </span> --curr<span class="Delimiter">.</span>nrefs<span class="Delimiter">;</span> +<span id="L404" class="LineNr">404 </span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"decrementing refcount of continuation "</span> << continuation_id << <span class="Constant">": "</span> << <span class="Constant">1</span>+curr<span class="Delimiter">.</span>nrefs << <span class="Constant">" -> "</span> << curr<span class="Delimiter">.</span>nrefs << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> +<span id="L405" class="LineNr">405 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>nrefs > <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span> +<span id="L406" class="LineNr">406 </span> <a href='003trace.cc.html#L167'>trace</a><span class="Delimiter">(</span><span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"reclaiming continuation "</span> << continuation_id << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> +<span id="L407" class="LineNr">407 </span> <span class="Comment">// temporarily push the stack frames for the continuation to the call stack before reclaiming their spaces</span> +<span id="L408" class="LineNr">408 </span> <span class="Comment">// (because reclaim_default_space() relies on the default-space being reclaimed being at the top of the stack)</span> +<span id="L409" class="LineNr">409 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>call_stack::const_iterator p = curr<span class="Delimiter">.</span>frames<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != curr<span class="Delimiter">.</span>frames<span class="Delimiter">.</span><a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span> +<span id="L410" class="LineNr">410 </span> <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>*p<span class="Delimiter">);</span> +<span id="L411" class="LineNr">411 </span> <span class="Conceal">¦</span> <a href='043space.cc.html#L244'>reclaim_default_space</a><span class="Delimiter">();</span> +<span id="L412" class="LineNr">412 </span> <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>pop_front<span class="Delimiter">();</span> +<span id="L413" class="LineNr">413 </span> <span class="Delimiter">}</span> +<span id="L414" class="LineNr">414 </span> Delimited_continuation<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>continuation_id<span class="Delimiter">);</span> +<span id="L415" class="LineNr">415 </span> <span class="Identifier">return</span><span class="Delimiter">;</span> +<span id="L416" class="LineNr">416 </span><span class="Delimiter">}</span> +<span id="L417" class="LineNr">417 </span> +<span id="L418" class="LineNr">418 </span><span class="Delimiter">:(scenario continuations_can_be_copied)</span> +<span id="L419" class="LineNr">419 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [ +<span id="L420" class="LineNr">420 </span> local-scope +<span id="L421" class="LineNr">421 </span> <span class="Normal">k</span>:continuation<span class="Special"> <- </span>call-with-continuation-mark <span class="Constant">233</span>/mark<span class="Delimiter">,</span> f +<span id="L422" class="LineNr">422 </span> <span class="Normal">k2</span>:continuation<span class="Special"> <- </span>copy k +<span id="L423" class="LineNr">423 </span> <span class="Comment"># reclaiming k and k2 shouldn't delete f's local scope twice</span> +<span id="L424" class="LineNr">424 </span>] +<span id="L425" class="LineNr">425 </span><span class="muRecipe">def</span> f [ +<span id="L426" class="LineNr">426 </span> local-scope +<span id="L427" class="LineNr">427 </span> load-ingredients +<span id="L428" class="LineNr">428 </span> <span class="Identifier">return</span>-continuation-until-mark <span class="Constant">233</span>/mark +<span id="L429" class="LineNr">429 </span> <span class="Identifier">return</span> <span class="Constant">0</span> +<span id="L430" class="LineNr">430 </span>] +<span id="L431" class="LineNr">431 </span>$error: <span class="Constant">0</span> +<span id="L432" class="LineNr">432 </span> +<span id="L433" class="LineNr">433 </span><span class="Delimiter">:(code)</span> +<span id="L434" class="LineNr">434 </span><span class="Normal">bool</span> is_mu_continuation<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="L435" class="LineNr">435 </span> canonize_type<span class="Delimiter">(</span>x<span class="Delimiter">);</span> +<span id="L436" class="LineNr">436 </span> <span class="Identifier">return</span> x<span class="Delimiter">.</span>type && x<span class="Delimiter">.</span>type<span class="Delimiter">-></span>atom && x<span class="Delimiter">.</span>type<span class="Delimiter">-></span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">"continuation"</span><span class="Delimiter">);</span> +<span id="L437" class="LineNr">437 </span><span class="Delimiter">}</span> +<span id="L438" class="LineNr">438 </span> +<span id="L439" class="LineNr">439 </span><span class="Comment">// helper for debugging</span> +<span id="L440" class="LineNr">440 </span><span class="Normal">void</span> <a href='003trace.cc.html#L120'>dump</a><span class="Delimiter">(</span><span class="Normal">const</span> <span class="Normal">int</span> continuation_id<span class="Delimiter">)</span> <span class="Delimiter">{</span> +<span id="L441" class="LineNr">441 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> continuation_id<span class="Delimiter">))</span> <span class="Delimiter">{</span> +<span id="L442" class="LineNr">442 </span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L174'>raise</a> << <span class="Constant">"missing delimited continuation: "</span> << continuation_id << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L203'>end</a><span class="Delimiter">();</span> +<span id="L443" class="LineNr">443 </span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span> +<span id="L444" class="LineNr">444 </span> <span class="Delimiter">}</span> +<span id="L445" class="LineNr">445 </span> delimited_continuation& curr = get<span class="Delimiter">(</span>Delimited_continuation<span class="Delimiter">,</span> continuation_id<span class="Delimiter">);</span> +<span id="L446" class="LineNr">446 </span> <a href='003trace.cc.html#L120'>dump</a><span class="Delimiter">(</span>curr<span class="Delimiter">.</span>frames<span class="Delimiter">);</span> +<span id="L447" class="LineNr">447 </span><span class="Delimiter">}</span> </pre> </body> </html> |