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<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Since different layers all carve out different parts of various namespaces</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">//: (recipes, memory, etc.) for their own use, there's no previous place where</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//: we can lay out the big picture of what uses what. So we'll do that here</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment">//: and just have to manually remember to update it when we move boundaries</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment">//: around.</span>
<span id="L6" class="LineNr"> 6 </span><span class="Comment">//:</span>
<span id="L7" class="LineNr"> 7 </span><span class="SalientComment">//:: Memory</span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment">//:</span>
<span id="L9" class="LineNr"> 9 </span><span class="Comment">//: Location 0 - unused (since it can help uncover bugs)</span>
<span id="L10" class="LineNr">10 </span><span class="Comment">//: Locations 1-899 - reserved for tests</span>
<span id="L11" class="LineNr">11 </span><span class="Comment">//: Locations 900-999 - reserved for predefined globals in Mu scenarios, like keyboard, screen, etc.</span>
<span id="L12" class="LineNr">12 </span><span class="Delimiter">:(before "End Setup")</span>
<span id="L13" class="LineNr">13 </span>assert<span class="Delimiter">(</span>Max_variables_in_scenarios == <span class="Constant">900</span><span class="Delimiter">);</span>
<span id="L14" class="LineNr">14 </span><span class="Comment">//: Locations 1000 ('Reserved_for_tests') onward - available to the allocator in chunks of size Initial_memory_per_routine.</span>
<span id="L15" class="LineNr">15 </span>assert<span class="Delimiter">(</span>Reserved_for_tests == <span class="Constant">1000</span><span class="Delimiter">);</span>
<span id="L16" class="LineNr">16 </span>
<span id="L17" class="LineNr">17 </span><span class="SalientComment">//:: Recipes</span>
<span id="L18" class="LineNr">18 </span><span class="Comment">//:</span>
<span id="L19" class="LineNr">19 </span><span class="Comment">//: 0 - unused (IDLE; do nothing)</span>
<span id="L20" class="LineNr">20 </span><span class="Comment">//: 1-199 - primitives</span>
<span id="L21" class="LineNr">21 </span>assert<span class="Delimiter">(</span><a href='010vm.cc.html#L191'>MAX_PRIMITIVE_RECIPES</a> < <span class="Constant">200</span><span class="Delimiter">);</span>
<span id="L22" class="LineNr">22 </span><span class="Comment">//: 200-999 - defined in .mu files as sequences of primitives</span>
<span id="L23" class="LineNr">23 </span>assert<span class="Delimiter">(</span>Next_recipe_ordinal == <span class="Constant">1000</span><span class="Delimiter">);</span>
<span id="L24" class="LineNr">24 </span><span class="Comment">//: 1000 onwards - reserved for tests, cleared between tests</span>
<span id="L25" class="LineNr">25 </span>
<span id="L26" class="LineNr">26 </span><span class="SalientComment">//:: Depths for tracing</span>
<span id="L27" class="LineNr">27 </span><span class="Comment">//:</span>
<span id="L28" class="LineNr">28 </span><span class="Comment">//: 0 - unused</span>
<span id="L29" class="LineNr">29 </span><span class="Comment">//: 1-100 - app-level trace statements in Mu</span>
<span id="L30" class="LineNr">30 </span><span class="Comment">//: 101-9989 - call-stack statements (mostly label run)</span>
<span id="L31" class="LineNr">31 </span>assert<span class="Delimiter">(</span>Initial_callstack_depth == <span class="Constant">101</span><span class="Delimiter">);</span>
<span id="L32" class="LineNr">32 </span>assert<span class="Delimiter">(</span>Max_callstack_depth == <span class="Constant">9989</span><span class="Delimiter">);</span>
<span id="L33" class="LineNr">33 </span><span class="Comment">//: 9990-9999 - intra-instruction lines (mostly label mem)</span>
<span id="L34" class="LineNr">34 </span>
<span id="L35" class="LineNr">35 </span><span class="SalientComment">//:: Summary of transforms and their dependencies</span>
<span id="L36" class="LineNr">36 </span><span class="Comment">//: begin transforms</span>
<span id="L37" class="LineNr">37 </span><span class="Comment">//: begin instruction inserting transforms</span>
<span id="L38" class="LineNr">38 </span><span class="Comment">//: 52 insert fragments</span>
<span id="L39" class="LineNr">39 </span><span class="Comment">//: ↳ 52.2 check fragments</span>
<span id="L40" class="LineNr">40 </span><span class="Comment">//: ---</span>
<span id="L41" class="LineNr">41 </span><span class="Comment">//: 53 rewrite 'stash' instructions</span>
<span id="L42" class="LineNr">42 </span><span class="Comment">//: end instruction inserting transforms</span>
<span id="L43" class="LineNr">43 </span><span class="Comment">//:</span>
<span id="L44" class="LineNr">44 </span><span class="Comment">//: begin instruction modifying transforms</span>
<span id="L45" class="LineNr">45 </span><span class="Comment">//: 56.2 check header ingredients</span>
<span id="L46" class="LineNr">46 </span><span class="Comment">//: ↳ 56.4 fill in return ingredients</span>
<span id="L47" class="LineNr">47 </span><span class="Comment">//: 48 check or set types by name</span>
<span id="L48" class="LineNr">48 </span><span class="Comment">//:</span>
<span id="L49" class="LineNr">49 </span><span class="Comment">//: begin type modifying transforms</span>
<span id="L50" class="LineNr">50 </span><span class="Comment">//: 56.3 deduce types from header</span>
<span id="L51" class="LineNr">51 </span><span class="Comment">//: ---</span>
<span id="L52" class="LineNr">52 </span><span class="Comment">//: 30 check or set invalid containers</span>
<span id="L53" class="LineNr">53 </span><span class="Comment">//: end type modifying transforms</span>
<span id="L54" class="LineNr">54 </span><span class="Comment">//: ↱ 46 collect surrounding spaces</span>
<span id="L55" class="LineNr">55 </span><span class="Comment">//: ↳ 42 transform names</span>
<span id="L56" class="LineNr">56 </span><span class="Comment">//: ↳ 57 static dispatch</span>
<span id="L57" class="LineNr">57 </span><span class="Comment">//: ---</span>
<span id="L58" class="LineNr">58 </span><span class="Comment">//: 13 update instruction operation</span>
<span id="L59" class="LineNr">59 </span><span class="Comment">//: 40 transform braces</span>
<span id="L60" class="LineNr">60 </span><span class="Comment">//: 41 transform labels</span>
<span id="L61" class="LineNr">61 </span><span class="Comment">//: end instruction modifying transforms</span>
<span id="L62" class="LineNr">62 </span><span class="Comment">//: ↳ 60 check immutable ingredients</span>
<span id="L63" class="LineNr">63 </span><span class="Comment">//:</span>
<span id="L64" class="LineNr">64 </span><span class="Comment">//: begin checks</span>
<span id="L65" class="LineNr">65 </span><span class="Comment">//: ---</span>
<span id="L66" class="LineNr">66 </span><span class="Comment">//: 21 check instruction</span>
<span id="L67" class="LineNr">67 </span><span class="Comment">//: ↳ 61 check indirect calls against header</span>
<span id="L68" class="LineNr">68 </span><span class="Comment">//: ↳ 56 check calls against header</span>
<span id="L69" class="LineNr">69 </span><span class="Comment">//: ↳ 43 transform 'new' to 'allocate'</span>
<span id="L70" class="LineNr">70 </span><span class="Comment">//: 30 check merge calls</span>
<span id="L71" class="LineNr">71 </span><span class="Comment">//: 36 check types of return instructions</span>
<span id="L72" class="LineNr">72 </span><span class="Comment">//: 43 check default space</span>
<span id="L73" class="LineNr">73 </span><span class="Comment">//: 56 check return instructions against header</span>
<span id="L74" class="LineNr">74 </span><span class="Comment">//: end checks</span>
<span id="L75" class="LineNr">75 </span><span class="Comment">//: end transforms</span>
<span id="L76" class="LineNr">76 </span>
<span id="L77" class="LineNr">77 </span><span class="SalientComment">//:: Summary of type-checking in different phases</span>
<span id="L78" class="LineNr">78 </span><span class="Comment">//: when dispatching instructions we accept first recipe that:</span>
<span id="L79" class="LineNr">79 </span><span class="Comment">//: strictly matches all types</span>
<span id="L80" class="LineNr">80 </span><span class="Comment">//: maps literal 0 or literal 1 to boolean for some ingredients</span>
<span id="L81" class="LineNr">81 </span><span class="Comment">//: performs some other acceptable type conversion</span>
<span id="L82" class="LineNr">82 </span><span class="Comment">//: literal 0 -> address</span>
<span id="L83" class="LineNr">83 </span><span class="Comment">//: literal -> character</span>
<span id="L84" class="LineNr">84 </span><span class="Comment">//: when checking instructions we ensure that types match, and that literals map to some scalar</span>
<span id="L85" class="LineNr">85 </span><span class="Comment">//: (address can only map to literal 0)</span>
<span id="L86" class="LineNr">86 </span><span class="Comment">//: (boolean can only map to literal 0 or literal 1)</span>
<span id="L87" class="LineNr">87 </span><span class="Comment">//: (but conditionals can take any scalar)</span>
<span id="L88" class="LineNr">88 </span><span class="Comment">//: at runtime we perform no checks</span>
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